CN104930154A - Hydraulic coupler - Google Patents
Hydraulic coupler Download PDFInfo
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- CN104930154A CN104930154A CN201510419097.4A CN201510419097A CN104930154A CN 104930154 A CN104930154 A CN 104930154A CN 201510419097 A CN201510419097 A CN 201510419097A CN 104930154 A CN104930154 A CN 104930154A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H41/00—Rotary fluid gearing of the hydrokinetic type
- F16H41/24—Details
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Abstract
The invention discloses a hydraulic coupler. The hydraulic coupler comprises a first hydraulic oil pump, a second hydraulic oil pump, a first gear, a second gear, a third gear, a hydraulic coupler input shaft, a first hydraulic motor, a second hydraulic motor, a fourth gear, a fifth gear, a sixth gear, a hydraulic coupler output shaft, a first proportional overflow valve, a second proportional overflow valve, a reversing valve, an oil tank, a first rotating speed sensor, a second rotating speed sensor and the like. The hydraulic coupler has the advantages that high work efficiency is achieved, the size is small, load-limited safety protecting is achieved, the starting performance is sufficient and adjustable, stepless speed adjusting can be achieved, the speed adjusting range is wider, and the hydraulic coupler can be applied to the starting process of a large turbine, a power generator and a draught fan, the stable starting, the limited safety protecting, speed adjusting, hydraulic braking and other functions are achieved in the working process of the turbine, the power generator and the draught fan, and wider application prospects are achieved.
Description
Technical field
The present invention relates to the Coupler used in the start-up course of power plant, be specifically related to a kind of hydraulic coupler, belong to electric and field of electromechanical technology.
Background technique
At present, in the start-up course of steam turbine and blower fan, widely use fluid coupling, realize the smooth starting of working procedure.But due to fluid coupling exist inefficiency, volume large, there is the shortcomings, particularly high-power fluid coupling such as speed discrepancy, Impeller Design and difficulty of processing are large between prime mover and working machine, its shortcoming is more outstanding.In order to overcome the above shortcoming of fluid coupling, the application proposes, a kind of hydraulic coupler, primarily of hydraulic-pressure pump, oil hydraulic motor, proportional pressure control valve, the compositions such as the first speed probe and the second speed probe, hydraulic-pressure pump on the one hand, oil hydraulic motor, the hydraulic element such as proportional pressure control valve are the product of ripe sizing, stable performance, purchase cost is low, on the other hand, utilize hydraulic-pressure pump, oil hydraulic motor, the hydraulic coupler of the composition such as proportional pressure control valve, there is higher working efficiency, startability is fully adjustable, stepless speed regulation can be realized, the characteristic that speed adjustable range is wider, simultaneously, second proportional pressure control valve is arranged on the hydraulic braking that oil hydraulic motor return line can realize working machine, and rational braking curve is set, obtain desirable braking ability.In the present invention, at the input shaft of hydraulic coupler and output shaft, the first speed probe and the second speed probe are installed respectively, can collection two speed probes have been passed through, carry out analysing and processing, the controlling curve of design proportion relief valve, more accurately controls the start-up course of working machine.So the hydraulic coupler that the application proposes has application prospect widely.
Summary of the invention
The object of the present invention is to provide a kind of hydraulic coupler.
The technical solution used in the present invention is: a kind of hydraulic coupler, comprise the first hydraulic-pressure pump (1), second hydraulic-pressure pump (2), first gear (1-4), second gear (2-4), 3rd gear (3), hydraulic coupler input shaft (4), first oil hydraulic motor (5), second oil hydraulic motor (6), 4th gear (5-4), 5th gear (6-4), 6th gear (7), hydraulic coupler output shaft (8), first proportional pressure control valve (9), second proportional pressure control valve (14), selector valve (15), fuel tank (10), first speed probe (12) and the second speed probe (13), return tube (11) and connecting pipeline, described fuel tank (10) comprises fuel tank right sideboard (10-1) and fuel tank left sideboard (10-2), described connecting pipeline comprises the first pipeline (11-1), second pipeline (11-2), 3rd pipeline (11-3), 4th pipeline (11-4), 5th pipeline (11-5), 6th pipeline (11-6), 7th pipeline (11-7), 8th pipeline (11-8), 9th pipeline (11-9), tenth pipeline (11-10), 11 pipeline (11-11), 12 pipeline (11-12), 13 pipeline (11-13), 14 pipeline (11-14), 15 pipeline (11-15).
Described first hydraulic-pressure pump (1) comprises the first oil pump input shaft (1-1), first oil pump oil outlet (1-3), first oil pump suction mouth (1-6), first oil pump leakage hole (1-7), described first hydraulic-pressure pump (1) is installed on fuel tank (10) inner side, and be arranged on fuel tank right sideboard (10-1) by the first oil pump mounting screw (1-5), the first oil pump end face seal pad (1-2) is provided with between the end face of the first hydraulic-pressure pump (1) and fuel tank right sideboard (10-1), play seal action, prevent oil liquid leakage, described first oil pump input shaft (1-1) is provided with the first gear (1-4), described first oil pump suction mouth (1-6) is by being communicated with the work fluid in fuel tank (10) by the 15 pipeline (11-15), described first oil pump leakage hole (1-7) is communicated with the work fluid in the second oil pump leakage hole (2-7) and fuel tank (10) by the 4th pipeline (11-4), described first oil pump oil outlet (1-3) is connected with the second oil pump oil outlet (2-3) by the second pipeline (11-2), and be connected with the 5th pipeline (11-5),
Described second hydraulic-pressure pump (2) comprises the second oil pump input shaft (2-1), second oil pump oil outlet (2-3), second oil pump suction mouth (2-6), second oil pump leakage hole (2-7), described second hydraulic-pressure pump (2) is installed on fuel tank (10) inner side, and be arranged on fuel tank right sideboard (10-1) by the second oil pump mounting screw (2-5), the second oil pump end face seal pad (2-2) is provided with between the end face of the second hydraulic-pressure pump (2) and fuel tank right sideboard (10-1), play seal action, prevent oil liquid leakage, described second oil pump input shaft (2-1) is provided with the second gear (2-4), described second oil pump suction mouth (2-6) is communicated with the work fluid in fuel tank (10) by the 3rd pipeline (11-3), described second oil pump leakage hole (2-7) is communicated with the work fluid in the first oil pump leakage hole (1-7) and fuel tank (10) by the 4th pipeline (11-4), described second oil pump oil outlet (2-3) is connected with the first oil pump oil outlet (1-3) by the second pipeline (11-2), and be connected with the 5th pipeline (11-5),
The left part of described hydraulic coupler input shaft (4) is provided with the 3rd gear (3), the right part of hydraulic coupler input shaft (4) can be connected with prime mover by coupling, described 3rd gear (3) is meshed with the first gear (1-4) and the second gear (2-4) respectively, during prime mover work, hydraulic coupler input shaft (4) and the 3rd gear (3) can be driven to rotate together by coupling, 3rd gear (3) drives the first gear (1-4) of being meshed with it and the second gear (2-4) to rotate together, first gear (1-4) and the second gear (2-4) drive the first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) to enter working state respectively,
Described first oil hydraulic motor (5) comprises the first motor output shaft (5-1), first motor filler opening (5-3), first motor return opening (5-6), first motor leakage hole (5-7), described first oil hydraulic motor (5) is installed on fuel tank (10) inner side, and be arranged on fuel tank left sideboard (10-2) by the first motor mounting screw (5-5), the first motor end face sealing gasket (5-2) is provided with between the end face of the first oil hydraulic motor (5) and fuel tank left sideboard (10-2), play seal action, prevent oil liquid leakage, described first motor output shaft (5-1) is provided with the 4th gear (5-4), described first motor return opening (5-6) is by return tube (11), first pipeline (11-1) is communicated with the 11 pipeline (11-11) and the 13 pipeline (11-13) respectively, and then be connected with the filler opening of the second proportional pressure control valve (14) with selector valve (15), described first motor leakage hole (5-7) is communicated with the work fluid in the second motor leakage hole (6-7) and fuel tank (10) by the 9th pipeline (11-9), described first motor filler opening (5-6) is connected with the second motor filler opening (6-6) by the 8th pipeline (11-8), and be connected with the 5th pipeline (11-5),
Described second oil hydraulic motor (6) comprises the second motor output shaft (6-1), second motor filler opening (6-3), second motor return opening (6-6), second motor leakage hole (6-7), described second oil hydraulic motor (6) is installed on fuel tank (10) inner side, and be arranged on fuel tank left sideboard (10-2) by the second motor mounting screw (6-5), the second motor end face sealing gasket (6-2) is provided with between the end face of the second oil hydraulic motor (6) and fuel tank left sideboard (10-2), play seal action, prevent oil liquid leakage, described second motor output shaft (6-1) is provided with the 5th gear (6-4), described second motor return opening (6-6) is by the tenth pipeline (11-10), first pipeline (11-1) is communicated with the 11 pipeline (11-11) and the 13 pipeline (11-13) respectively, and then be connected with the filler opening of the second proportional pressure control valve (14) with selector valve (15), described second motor leakage hole (6-7) is communicated with the work fluid in the first motor leakage hole (5-7) and fuel tank (10) by the 9th pipeline (11-9), described second motor filler opening (6-6) is connected with the first motor filler opening (5-6) by the 8th pipeline (11-8), and be connected with the 5th pipeline (11-5), the right part of described hydraulic coupler output shaft (8) is provided with the 6th gear (7), the left part of hydraulic coupler output shaft (8) can be connected with working machine by coupling, and described 6th gear (7) is meshed with the 4th gear (5-4) and the 5th gear (6-4) respectively.
When the first oil hydraulic motor (5) and the second oil hydraulic motor (6) work, the 6th gear (7) and hydraulic coupler output shaft (8) can be driven to produce respectively by the 4th gear (5-4) be meshed with the 6th gear (7) and the 5th gear (6-4) to rotate, hydraulic coupler output shaft (8) can drive working machine to enter working state by coupling.
The filler opening of described first proportional pressure control valve (9) is connected with the 5th pipeline (11-5) by the 6th pipeline (11-6), and be connected with the first motor filler opening (5-3), the second motor filler opening (6-3) with the first oil pump oil outlet (1-6), the second oil pump oil outlet (2-6) respectively by the 5th pipeline (11-5), the working pressure of hydraulic control Coupler, the oil outlet of described first proportional pressure control valve (9) is communicated with the work fluid in fuel tank (10) by the 7th pipeline (11-7); Described fuel tank (10) internal storage has work fluid, the fuel tank right sideboard (10-1) of fuel tank (10) offers through hole, first oil pump input shaft (1-1) and the second oil pump input shaft (2-1) pass from the through hole fuel tank right sideboard (10-1) respectively, the fuel tank left sideboard (10-2) of fuel tank (10) offers through hole, and the first motor output shaft (5-1) and the second motor output shaft (6-1) pass from the through hole fuel tank left sideboard (10-2) respectively.
The filler opening of described second proportional pressure control valve (14) is by the 11 pipeline (11-11), first pipeline (11-1), return tube (11) is connected with the second motor return opening (6-6) with the first motor return opening (5-6) respectively with the tenth pipeline (11-10), the return opening of described second proportional pressure control valve (14) is by the 12 pipeline (11-12), 15 pipeline (11-15) is communicated with the work fluid in fuel tank (10), the filler opening of described selector valve (15) is by the 13 pipeline (11-13), first pipeline (11-1), return tube (11) is connected with the second motor return opening (6-6) with the first motor return opening (5-6) respectively with the tenth pipeline (11-10), the return opening of described selector valve (15) is by the 14 pipeline (11-14), 15 pipeline (11-15) is communicated with the work fluid in fuel tank (10).When hydraulic coupler work, selector valve (15) are in left position working state, the oil return of the first oil hydraulic motor (5) and the second oil hydraulic motor (6) is got back in fuel tank (10) respectively by the first motor return opening (5-6) and the second motor return opening (6-6), return tube (11) and the tenth pipeline (11-10), the first pipeline (11-1), the 13 pipeline (11-13), the left position of selector valve (13), the 14 pipeline (11-14), the 15 pipeline (11-15), and working machine is in normal working; When hydraulic coupler work, selector valve (15) are in right position working state, the oil return of the first oil hydraulic motor (5) and the second oil hydraulic motor (6) is got back in fuel tank (10) respectively by the first motor return opening (5-6) and the second motor return opening (6-6), return tube (11) and the tenth pipeline (11-10), the first pipeline (11-1), the 11 pipeline (11-11), the second proportional pressure control valve (12), the 12 pipeline (11-12), the 15 pipeline (11-15), and working machine is in braking state.
Described first speed probe (12) is installed on hydraulic coupler input shaft (4) place, can detect the rotating speed of hydraulic coupler input shaft (4) in real time, is equivalent to the output speed detecting prime mover in real time; Described second speed probe (13) is installed on hydraulic coupler output shaft (8) place, can detect the rotating speed of hydraulic coupler output shaft (8) in real time, is equivalent to the input speed of real-time testing machine.
When hydraulic coupler starts, the working machine be connected with hydraulic coupler output shaft (8) has larger inertia load and friction load, in order to enable working machine smooth starting, reduce startup impact and the starting load of prime mover, the output speed of prime mover and the input speed of the real-time testing machine of the second speed probe (13) is detected in real time by the first speed probe (12), and analysing and processing is carried out to test data, to the first proportional pressure control valve (9) accurate control signal reasonable in design, corresponding to the cracking pressure curve of the first proportional pressure control valve (9), and progressively increase the control signal of the first proportional pressure control valve (9), operating oil pressure corresponding to the first oil hydraulic motor (5) and the second oil hydraulic motor (6) steadily increases, the output torque of the first motor output shaft (5-1) and the second motor output shaft (6-1) progressively increases, and pass to the 6th gear (7) and hydraulic coupler output shaft (8) by the 4th gear (5-4) and the 5th gear (6-4), hydraulic coupler output shaft (8) can drive working machine to enter working state by coupling, steadily realize working machine start-up course, the cracking pressure of final control first proportional pressure control valve (9) reach with slightly larger than oil pressure corresponding to working machine nominal torque, ensure in working machine rated load ranges on the one hand, first proportional pressure control valve (9) can not produce overflow, the work fluid that first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) are exported fully enters in the first oil hydraulic motor (5) and the second oil hydraulic motor (6), improve the working efficiency of hydraulic coupler, on the other hand, when job opportunity is to fault state, when there is overload, the inlet pressure of the first proportional pressure control valve (9) raises, when being greater than the cracking pressure of the first proportional pressure control valve (9), first proportional pressure control valve (9) produces overflow, limit the operating oil pressure of the first oil hydraulic motor (5) and the second oil hydraulic motor (6), the operating load of final restriction working machine, prevent hydraulic coupler and prime mover overload, play safety protection effect.So, by in the first hydraulic-pressure pump (1), second hydraulic-pressure pump (2), first oil hydraulic motor (5), the path of the second oil hydraulic motor (6) is arranged the smooth starting that the first proportional pressure control valve (9) can realize working machine, the output speed of prime mover and the input speed of the real-time testing machine of the second speed probe (13) is detected in real time by the first speed probe (12), and analysing and processing is carried out to test data, to the first proportional pressure control valve (9) accurate control signal reasonable in design, corresponding to the cracking pressure curve of the first proportional pressure control valve (9), very easily can control the start-up course of working machine, simultaneously, after using the first proportional pressure control valve (9) in hydraulic coupler, the overload protection function of hydraulic coupler can be realized easily.
When hydraulic coupler work, when selector valve (15) is in left position working state, prime mover drives hydraulic coupler input shaft (4) and the 3rd gear (3) to rotate together by coupling, 3rd gear (3) drives the first gear (1-4) of being meshed with it and the second gear (2-4) to rotate together, first gear (1-4) and the second gear (2-4) drive the first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) to enter working state respectively, first hydraulic-pressure pump (1) is by the first oil pump suction mouth (1-6), 15 pipeline (11-15) absorption work fluid from fuel tank (10), second hydraulic-pressure pump (2) is by the second oil pump suction mouth (2-6), 3rd pipeline (11-3) absorption work fluid from fuel tank (10), work fluid is discharged from the first oil pump oil outlet (1-3) and the second oil pump oil outlet (2-3) respectively, and by the second pipeline (11-2), 5th pipeline (11-5), 8th pipeline (11-8) enters the first motor filler opening (5-3) and the second motor filler opening (6-3) respectively, the oil return of the first oil hydraulic motor (5) and the second oil hydraulic motor (6) is respectively by the first motor return opening (5-6) and the second motor return opening (6-6), return tube (11) and the tenth pipeline (11-10), first pipeline (11-1), 13 pipeline (11-13), the left position of selector valve (15), 14 pipeline (11-14), 15 pipeline (11-15) is got back in fuel tank (10), first oil hydraulic motor (5) and the second oil hydraulic motor (6) work, first oil hydraulic motor (5) and the second oil hydraulic motor (6) can drive the 6th gear (7) and hydraulic coupler output shaft (8) to produce respectively by the 4th gear (5-4) be meshed with the 6th gear (7) and the 5th gear (6-4) and rotate, hydraulic coupler output shaft (8) can drive working machine to enter working state by coupling.The Leakage Energy of the first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) respectively by the first oil pump leakage hole (1-7) and the second oil pump leakage hole (2-7), and flows back in fuel tank (10) through the 4th pipeline (11-4); The Leakage Energy of the first oil hydraulic motor (5) and the second oil hydraulic motor (6) respectively by the first motor leakage hole (5-7) and the second motor leakage hole (6-7), and flows back in fuel tank (10) through the 9th pipeline (11-9).
When hydraulic coupler work, selector valve (15) is in right position working state, simultaneously, first proportional pressure control valve (9) control signal is set to zero, the operating oil pressure of the first oil hydraulic motor (5) and the second oil hydraulic motor (6) is made to be in minimum state, the oil return of the first oil hydraulic motor (5) and the second oil hydraulic motor (6) is respectively by the first motor return opening (5-6) and the second motor return opening (6-6), return tube (11) and the tenth pipeline (11-10), first pipeline (11-1), 11 pipeline (11-11), second proportional pressure control valve (14), 12 pipeline (11-12), 15 pipeline (11-15) is got back in fuel tank (10), realize the hydraulic braking of working machine.
Described first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) can be metering pump or variable displacement pump, when the first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) are for variable displacement pump, the speed-regulating function of hydraulic coupler can be realized, because variable displacement pump speed governing is volumetric speed control, hydraulic coupler is made to have higher speed efficiency.The hydraulic-pressure pump quantity used in hydraulic coupler can be more than Liang Tai and two.
Described first oil hydraulic motor (5) and the second oil hydraulic motor (6) can be fixed displacement motor or variable displacement motor, when the first oil hydraulic motor (5) and the second oil hydraulic motor (6) are for variable displacement motor, the speed-regulating function of hydraulic coupler can be realized, because variable displacement motor speed governing is volumetric speed control, hydraulic coupler is made to have higher speed efficiency.The oil hydraulic motor quantity used in hydraulic coupler can be more than Liang Tai and two.
Described first proportional pressure control valve (9) and the second proportional pressure control valve (14) can be manual tune relief valves.
When hydraulic coupler uses variable displacement pump or variable displacement motor, hydraulic coupler possesses speed-regulating function, and hydraulic coupler has higher speed efficiency and wider speed adjustable range simultaneously.
The invention has the beneficial effects as follows:
The present invention is by hydraulic-pressure pump, oil hydraulic motor, proportional pressure control valve, the compositions such as the first speed probe and the second speed probe, hydraulic-pressure pump on the one hand, oil hydraulic motor, the hydraulic element such as proportional pressure control valve are the product of ripe sizing, stable performance, purchase cost is low, on the other hand, utilize hydraulic-pressure pump, oil hydraulic motor, the hydraulic coupler of the composition such as proportional pressure control valve, there is higher working efficiency, volume is little, restriction safety protection, startability is fully adjustable, stepless speed regulation can be realized, the characteristics such as speed adjustable range is wider, simultaneously, second proportional pressure control valve is arranged on the hydraulic braking that oil hydraulic motor return line can realize working machine, and rational braking curve is set, obtain desirable braking ability.In the present invention, at the input shaft of hydraulic coupler and output shaft, the first speed probe and the second speed probe are installed respectively, collection two speed probes can be passed through, carry out analysing and processing, the controlling curve of design proportion relief valve, more accurately control the start-up course of working machine, so the hydraulic coupler that the present invention proposes has application prospect widely.
Accompanying drawing explanation
The embodiment provided below in conjunction with accompanying drawing is described in more detail the present invention.
Fig. 1 is structural representation of the present invention.
Embodiment
As shown in Figure 1, a kind of hydraulic coupler, comprises the first hydraulic-pressure pump 1, second hydraulic-pressure pump 2, first gear 1-4, the second gear 2-4, the 3rd gear 3, hydraulic coupler input shaft 4, first oil hydraulic motor 5, second oil hydraulic motor 6, the 4th gear 5-4, the 5th gear 6-4, the 6th gear 7, hydraulic coupler output shaft 8, first proportional pressure control valve 9, second proportional pressure control valve 14, selector valve 15, fuel tank 10, first speed probe 12 and the second speed probe 13, return tube 11 and connecting pipeline; Fuel tank 10 comprises fuel tank right sideboard 10-1 and fuel tank left sideboard 10-2, and connecting pipeline comprises the first pipeline 11-1, the second pipeline 11-2, the 3rd pipeline 11-3, the 4th pipeline 11-4, the 5th pipeline 11-5, the 6th pipeline 11-6, the 7th pipeline 11-7, the 8th pipeline 11-8, the 9th pipeline 11-9, the tenth pipeline 11-10, the 11 pipeline 11-11, the 12 pipeline 11-12, the 13 pipeline 11-13, the 14 pipeline 11-14, the 15 pipeline 11-15.
First hydraulic-pressure pump 1 comprises the first oil pump input shaft 1-1, first oil pump oil outlet 1-3, first oil pump suction mouth 1-6, first oil pump leakage hole 1-7, first hydraulic-pressure pump 1 is installed on inside fuel tank 10, and be arranged on fuel tank right sideboard 10-1 by the first oil pump mounting screw 1-5, the first oil pump end face seal pad 1-2 is provided with between the end face of the first hydraulic-pressure pump 1 and fuel tank right sideboard 10-1, play seal action, prevent oil liquid leakage, first oil pump input shaft 1-1 is provided with the first gear 1-4, first oil pump suction mouth 1-6 is by being communicated with the work fluid in fuel tank 10 by the 15 pipeline 11-15, first oil pump leakage hole 1-7 is communicated with the work fluid in the second oil pump leakage hole 2-7 and fuel tank 10 by the 4th pipeline 11-4, first oil pump oil outlet 1-3 is connected with the second oil pump oil outlet 2-3 by the second pipeline 11-2, and be connected with the 5th pipeline 11-5,
Second hydraulic-pressure pump 2 comprises the second oil pump input shaft 2-1, second oil pump oil outlet 2-3, second oil pump suction mouth 2-6, second oil pump leakage hole 2-7, second hydraulic-pressure pump 2 is installed on inside fuel tank 10, and be arranged on fuel tank right sideboard 10-1 by the second oil pump mounting screw 2-5, the second oil pump end face seal pad 2-2 is provided with between the end face of the second hydraulic-pressure pump 2 and fuel tank right sideboard 10-1, play seal action, prevent oil liquid leakage, second oil pump input shaft 2-1 is provided with the second gear 2-4, second oil pump suction mouth 2-6 is communicated with the work fluid in fuel tank 10 by the 3rd pipeline 11-3, second oil pump leakage hole 2-7 is communicated with the work fluid in the first oil pump leakage hole 1-7 and fuel tank 10 by the 4th pipeline 11-4, second oil pump oil outlet 2-3 is connected with the first oil pump oil outlet 1-3 by the second pipeline 11-2, and be connected with the 5th pipeline 11-5,
The left part of hydraulic coupler input shaft 4 is provided with the 3rd gear 3, the right part of hydraulic coupler input shaft 4 can be connected with prime mover by coupling, 3rd gear 3 is meshed with the first gear 1-4 and the second gear 2-4 respectively, during prime mover work, hydraulic coupler input shaft 4 and the 3rd gear 3 can be driven to rotate together by coupling, 3rd gear 3 drives the first gear 1-4 be meshed with it to rotate together with the second gear 2-4, and the first gear 1-4 and the second gear 2-4 drives the first hydraulic-pressure pump 1 and the second hydraulic-pressure pump 2 to enter working state respectively;
First oil hydraulic motor 5 comprises the first motor output shaft 5-1, first motor filler opening 5-3, first motor return opening 5-6, first motor leakage hole 5-7, first oil hydraulic motor 5 is installed on inside fuel tank 10, and be arranged on fuel tank left sideboard 10-2 by the first motor mounting screw 5-5, the first motor end face sealing gasket 5-2 is provided with between the end face of the first oil hydraulic motor 5 and fuel tank left sideboard 10-2, play seal action, prevent oil liquid leakage, first motor output shaft 5-1 is provided with the 4th gear 5-4, first motor return opening 5-6 is by return tube 11, first pipeline 11-1 is communicated with the 11 pipeline 11-11 and the 13 pipeline 11-13 respectively, and then be connected with the filler opening of selector valve 15 with the second proportional pressure control valve 14, first motor leakage hole 5-7 is communicated with the work fluid in the second motor leakage hole 6-7 and fuel tank 10 by the 9th pipeline 11-9, first motor filler opening 5-6 is connected with the second motor filler opening 6-6 by the 8th pipeline 11-8, and be connected with the 5th pipeline 11-5,
Second oil hydraulic motor 6 comprises the second motor output shaft 6-1, second motor filler opening 6-3, second motor return opening 6-6, second motor leakage hole 6-7, second oil hydraulic motor 6 is installed on inside fuel tank 10, and be arranged on fuel tank left sideboard 10-2 by the second motor mounting screw 6-5, the second motor end face sealing gasket 6-2 is provided with between the end face of the second oil hydraulic motor 6 and fuel tank left sideboard 10-2, play seal action, prevent oil liquid leakage, second motor output shaft 6-1 is provided with the 5th gear 6-4, second motor return opening 6-6 is by the tenth pipeline 11-10, first pipeline 11-1 is communicated with the 11 pipeline 11-11 and the 13 pipeline 11-13 respectively, and then be connected with the filler opening of selector valve 15 with the second proportional pressure control valve 14, second motor leakage hole 6-7 is communicated with the work fluid in the first motor leakage hole 5-7 and fuel tank 10 by the 9th pipeline 11-9, second motor filler opening 6-6 is connected with the first motor filler opening 5-6 by the 8th pipeline 11-8, and be connected with the 5th pipeline 11-5, the right part of hydraulic coupler output shaft 8 is provided with the 6th gear 7, and the left part of hydraulic coupler output shaft 8 can be connected with working machine by coupling, and the 6th gear 7 is meshed with the 4th gear 5-4 and the 5th gear 6-4 respectively.
When first oil hydraulic motor 5 and the second oil hydraulic motor 6 work, the 6th gear 7 and hydraulic coupler output shaft 8 can be driven to produce respectively by the 4th gear 5-4 be meshed with the 6th gear 7 and the 5th gear 6-4 to rotate, hydraulic coupler output shaft 8 can drive working machine to enter working state by coupling.
The filler opening of the first proportional pressure control valve 9 is connected with the 5th pipeline 11-5 by the 6th pipeline 11-6, and be connected with the first motor filler opening 5-3, the second motor filler opening 6-3 with the first oil pump oil outlet 1-6, the second oil pump oil outlet 2-6 respectively by the 5th pipeline 11-5, the working pressure of hydraulic control Coupler, the oil outlet of the first proportional pressure control valve 9 is communicated with the work fluid in fuel tank 10 by the 7th pipeline 11-7; Fuel tank 10 internal storage has work fluid, the fuel tank right sideboard 10-1 of fuel tank 10 offers through hole, first oil pump input shaft 1-1 and the second oil pump input shaft 2-1 passes from the through hole fuel tank right sideboard 10-1 respectively, the fuel tank left sideboard 10-2 of fuel tank 10 offers through hole, and the first motor output shaft 5-1 and the second motor output shaft 6-1 passes from the through hole fuel tank left sideboard 10-2 respectively.
The filler opening of the second proportional pressure control valve 14 is by the 11 pipeline 11-11, first pipeline 11-1, return tube 11 and the tenth pipeline 11-10 are connected with the second motor return opening 6-6 with the first motor return opening 5-6 respectively, the return opening of the second proportional pressure control valve 14 is by the 12 pipeline 11-12, 15 pipeline 11-15 is communicated with the work fluid in fuel tank 10, the filler opening of selector valve 15 is by the 13 pipeline 11-13, first pipeline 11-1, return tube 11 and the tenth pipeline 11-10 are connected with the second motor return opening 6-6 with the first motor return opening 5-6 respectively, the return opening of selector valve 15 is by the 14 pipeline 11-14, 15 pipeline 11-15 is communicated with the work fluid in fuel tank 10.When hydraulic coupler work, selector valve 15 are in left position working state, the oil return of the first oil hydraulic motor 5 and the second oil hydraulic motor 6 is got back in fuel tank 10 respectively by the first motor return opening 5-6 and the second motor return opening 6-6, return tube 11 and the tenth pipeline 11-10, the first pipeline 11-1, the 13 pipeline 11-13, the left position of selector valve 13, the 14 pipeline 11-14, the 15 pipeline 11-15, and working machine is in normal working; When hydraulic coupler work, selector valve 15 are in right position working state, the oil return of the first oil hydraulic motor 5 and the second oil hydraulic motor 6 is got back in fuel tank 10 respectively by the first motor return opening 5-6 and the second motor return opening 6-6, return tube 11 and the tenth pipeline 11-10, the first pipeline 11-1, the 11 pipeline 11-11, the second proportional pressure control valve the 12, the 12 pipeline 11-12, the 15 pipeline 11-15, and working machine is in braking state.
First speed probe 12 is installed on hydraulic coupler input shaft 4 place, can detect the rotating speed of hydraulic coupler input shaft 4 in real time, is equivalent to the output speed detecting prime mover in real time; Second speed probe 13 is installed on hydraulic coupler output shaft 8 place, can detect the rotating speed of hydraulic coupler output shaft 8 in real time, is equivalent to the input speed of real-time testing machine.
When hydraulic coupler starts, the working machine be connected with hydraulic coupler output shaft 8 has larger inertia load and friction load, in order to enable working machine smooth starting, reduce startup impact and the starting load of prime mover, the output speed of prime mover and the input speed of the real-time testing machine of the second speed probe 13 is detected in real time by the first speed probe 12, and analysing and processing is carried out to test data, to the first proportional pressure control valve 9 accurate control signal reasonable in design, corresponding to the cracking pressure curve of the first proportional pressure control valve 9, and progressively increase the control signal of the first proportional pressure control valve 9, operating oil pressure corresponding to the first oil hydraulic motor 5 and the second oil hydraulic motor 6 steadily increases, the output torque of the first motor output shaft 5-1 and the second motor output shaft 6-1 progressively increases, and pass to the 6th gear 7 and hydraulic coupler output shaft 8 by the 4th gear 5-4 and the 5th gear 6-4, hydraulic coupler output shaft 8 can drive working machine to enter working state by coupling, steadily realize working machine start-up course, the cracking pressure of final control first proportional pressure control valve 9 reach with slightly larger than oil pressure corresponding to working machine nominal torque, ensure in working machine rated load ranges on the one hand, first proportional pressure control valve 9 can not produce overflow, the work fluid that first hydraulic-pressure pump 1 and the second hydraulic-pressure pump 2 are exported fully enters in the first oil hydraulic motor 5 and the second oil hydraulic motor 6, improve the working efficiency of hydraulic coupler, on the other hand, when job opportunity is to fault state, when there is overload, the inlet pressure of the first proportional pressure control valve 9 raises, when being greater than the cracking pressure of the first proportional pressure control valve 9, first proportional pressure control valve 9 produces overflow, limit the operating oil pressure of the first oil hydraulic motor 5 and the second oil hydraulic motor 6, the operating load of final restriction working machine, prevent hydraulic coupler and prime mover overload, play safety protection effect.So, by at the first hydraulic-pressure pump 1, second hydraulic-pressure pump 2, first oil hydraulic motor 5, the path of the second oil hydraulic motor 6 is arranged the smooth starting that the first proportional pressure control valve 9 can realize working machine, the output speed of prime mover and the input speed of the real-time testing machine of the second speed probe 13 is detected in real time by the first speed probe 12, and analysing and processing is carried out to test data, to the first proportional pressure control valve 9 accurate control signal reasonable in design, corresponding to the cracking pressure curve of the first proportional pressure control valve 9, very easily can control the start-up course of working machine, simultaneously, after using the first proportional pressure control valve 9 in hydraulic coupler, the overload protection function of hydraulic coupler can be realized easily.
When hydraulic coupler work, when selector valve 15 is in left position working state, prime mover drives hydraulic coupler input shaft 4 and the 3rd gear 3 to rotate together by coupling, 3rd gear 3 drives the first gear 1-4 be meshed with it to rotate together with the second gear 2-4, first gear 1-4 and the second gear 2-4 drives the first hydraulic-pressure pump 1 and the second hydraulic-pressure pump 2 to enter working state respectively, first hydraulic-pressure pump 1 is by the first oil pump suction mouth 1-6, 15 pipeline 11-15 draws work fluid from fuel tank 10, second hydraulic-pressure pump 2 is by the second oil pump suction mouth 2-6, 3rd pipeline 11-3 draws work fluid from fuel tank 10, work fluid is discharged from the first oil pump oil outlet 1-3 and the second oil pump oil outlet 2-3 respectively, and by the second pipeline 11-2, 5th pipeline 11-5, 8th pipeline 11-8 enters the first motor filler opening 5-3 and the second motor filler opening 6-3 respectively, the oil return of the first oil hydraulic motor 5 and the second oil hydraulic motor 6 is respectively by the first motor return opening 5-6 and the second motor return opening 6-6, return tube 11 and the tenth pipeline 11-10, first pipeline 11-1, 13 pipeline 11-13, the left position of selector valve 15, 14 pipeline 11-14, 15 pipeline 11-15 gets back in fuel tank 10, first oil hydraulic motor 5 and the second oil hydraulic motor 6 work, first oil hydraulic motor 5 and the second oil hydraulic motor 6 can drive the 6th gear 7 and hydraulic coupler output shaft 8 to produce respectively by the 4th gear 5-4 be meshed with the 6th gear 7 and the 5th gear 6-4 and rotate, hydraulic coupler output shaft 8 can drive working machine to enter working state by coupling.The Leakage Energy of the first hydraulic-pressure pump 1 and the second hydraulic-pressure pump 2 respectively by the first oil pump leakage hole 1-7 and the second oil pump leakage hole 2-7, and flows back in fuel tank 10 through the 4th pipeline 11-4; The Leakage Energy of the first oil hydraulic motor 5 and the second oil hydraulic motor 6 respectively by the first motor leakage hole 5-7 and the second motor leakage hole 6-7, and flows back in fuel tank 10 through the 9th pipeline 11-9.
When hydraulic coupler work, selector valve 15 is in right position working state, simultaneously, first proportional pressure control valve 9 control signal is set to zero, the operating oil pressure of the first oil hydraulic motor 5 and the second oil hydraulic motor 6 is made to be in minimum state, the oil return of the first oil hydraulic motor 5 and the second oil hydraulic motor 6 is respectively by the first motor return opening 5-6 and the second motor return opening 6-6, return tube 11 and the tenth pipeline 11-10, first pipeline 11-1, 11 pipeline 11-11, second proportional pressure control valve 14, 12 pipeline 11-12, 15 pipeline 11-15 gets back in fuel tank 10, realize the hydraulic braking of working machine.
Preferably, first hydraulic-pressure pump 1 and the second hydraulic-pressure pump 2 can be metering pump or variable displacement pump, when the first hydraulic-pressure pump 1 and the second hydraulic-pressure pump 2 are variable displacement pump, the speed-regulating function of hydraulic coupler can be realized, because variable displacement pump speed governing is volumetric speed control, hydraulic coupler is made to have higher speed efficiency.The hydraulic-pressure pump quantity used in hydraulic coupler can be more than Liang Tai and two.
Preferably, first oil hydraulic motor 5 and the second oil hydraulic motor 6 can be fixed displacement motor or variable displacement motor, when the first oil hydraulic motor 5 and the second oil hydraulic motor 6 are variable displacement motor, the speed-regulating function of hydraulic coupler can be realized, because variable displacement motor speed governing is volumetric speed control, hydraulic coupler is made to have higher speed efficiency.The oil hydraulic motor quantity used in hydraulic coupler can be more than Liang Tai and two.
Preferably, the first proportional pressure control valve 9 and the second proportional pressure control valve 14 also can be manual tune relief valves.
When hydraulic coupler uses variable displacement pump or variable displacement motor, hydraulic coupler possesses speed-regulating function, and hydraulic coupler has higher speed efficiency and wider speed adjustable range simultaneously.
The invention has the beneficial effects as follows:
The present invention is by hydraulic-pressure pump, oil hydraulic motor, proportional pressure control valve, the compositions such as the first speed probe and the second speed probe, hydraulic-pressure pump on the one hand, oil hydraulic motor, the hydraulic element such as proportional pressure control valve are the product of ripe sizing, stable performance, purchase cost is low, on the other hand, utilize hydraulic-pressure pump, oil hydraulic motor, the hydraulic coupler of the composition such as proportional pressure control valve, there is higher working efficiency, volume is little, restriction safety protection, startability is fully adjustable, stepless speed regulation can be realized, the characteristics such as speed adjustable range is wider, simultaneously, second proportional pressure control valve is arranged on the hydraulic braking that oil hydraulic motor return line can realize working machine, and rational braking curve is set, obtain desirable braking ability.In the present invention, at the input shaft of hydraulic coupler and output shaft, the first speed probe and the second speed probe are installed respectively, collection two speed probes can be passed through, carry out analysing and processing, the controlling curve of design proportion relief valve, more accurately control the start-up course of working machine, so the hydraulic coupler that the present invention proposes has application prospect widely.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a hydraulic coupler, it is characterized in that: comprise the first hydraulic-pressure pump (1), second hydraulic-pressure pump (2), first gear (1-4), second gear (2-4), 3rd gear (3), hydraulic coupler input shaft (4), first oil hydraulic motor (5), second oil hydraulic motor (6), 4th gear (5-4), 5th gear (6-4), 6th gear (7), hydraulic coupler output shaft (8), first proportional pressure control valve (9), second proportional pressure control valve (14), selector valve (15), fuel tank (10), first speed probe (12) and the second speed probe (13), return tube (11) and connecting pipeline, described fuel tank (10) comprises fuel tank right sideboard (10-1) and fuel tank left sideboard (10-2), described connecting pipeline comprises the first pipeline (11-1), second pipeline (11-2), 3rd pipeline (11-3), 4th pipeline (11-4), 5th pipeline (11-5), 6th pipeline (11-6), 7th pipeline (11-7), 8th pipeline (11-8), 9th pipeline (11-9), tenth pipeline (11-10), 11 pipeline (11-11), 12 pipeline (11-12), 13 pipeline (11-13), 14 pipeline (11-14), 15 pipeline (11-15),
Described first hydraulic-pressure pump (1) comprises the first oil pump input shaft (1-1), first oil pump oil outlet (1-3), first oil pump suction mouth (1-6), first oil pump leakage hole (1-7), described first hydraulic-pressure pump (1) is installed on fuel tank (10) inner side, and be arranged on fuel tank right sideboard (10-1) by the first oil pump mounting screw (1-5), the first oil pump end face seal pad (1-2) is provided with between the end face of the first hydraulic-pressure pump (1) and fuel tank right sideboard (10-1), play seal action, prevent oil liquid leakage, described first oil pump input shaft (1-1) is provided with the first gear (1-4), described first oil pump suction mouth (1-6) is by being communicated with the work fluid in fuel tank (10) by the 15 pipeline (11-15), described first oil pump leakage hole (1-7) is communicated with the work fluid in the second oil pump leakage hole (2-7) and fuel tank (10) by the 4th pipeline (11-4), described first oil pump oil outlet (1-3) is connected with the second oil pump oil outlet (2-3) by the second pipeline (11-2), and be connected with the 5th pipeline (11-5),
Described second hydraulic-pressure pump (2) comprises the second oil pump input shaft (2-1), second oil pump oil outlet (2-3), second oil pump suction mouth (2-6), second oil pump leakage hole (2-7), described second hydraulic-pressure pump (2) is installed on fuel tank (10) inner side, and be arranged on fuel tank right sideboard (10-1) by the second oil pump mounting screw (2-5), the second oil pump end face seal pad (2-2) is provided with between the end face of the second hydraulic-pressure pump (2) and fuel tank right sideboard (10-1), play seal action, prevent oil liquid leakage, described second oil pump input shaft (2-1) is provided with the second gear (2-4), described second oil pump suction mouth (2-6) is communicated with the work fluid in fuel tank (10) by the 3rd pipeline (11-3), described second oil pump leakage hole (2-7) is communicated with the work fluid in the first oil pump leakage hole (1-7) and fuel tank (10) by the 4th pipeline (11-4), described second oil pump oil outlet (2-3) is connected with the first oil pump oil outlet (1-3) by the second pipeline (11-2), and be connected with the 5th pipeline (11-5),
The left part of described hydraulic coupler input shaft (4) is provided with the 3rd gear (3), the right part of hydraulic coupler input shaft (4) is connected with prime mover by coupling, described 3rd gear (3) is meshed with the first gear (1-4) and the second gear (2-4) respectively, during prime mover work, hydraulic coupler input shaft (4) and the 3rd gear (3) is driven to rotate together by coupling, 3rd gear (3) drives the first gear (1-4) of being meshed with it and the second gear (2-4) to rotate together, first gear (1-4) and the second gear (2-4) drive the first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) to enter working state respectively,
Described first oil hydraulic motor (5) comprises the first motor output shaft (5-1), first motor filler opening (5-3), first motor return opening (5-6), first motor leakage hole (5-7), described first oil hydraulic motor (5) is installed on fuel tank (10) inner side, and be arranged on fuel tank left sideboard (10-2) by the first motor mounting screw (5-5), the first motor end face sealing gasket (5-2) is provided with between the end face of the first oil hydraulic motor (5) and fuel tank left sideboard (10-2), play seal action, prevent oil liquid leakage, described first motor output shaft (5-1) is provided with the 4th gear (5-4), described first motor return opening (5-6) is by return tube (11), first pipeline (11-1) is communicated with the 11 pipeline (11-11) and the 13 pipeline (11-13) respectively, and then be connected with the filler opening of the second proportional pressure control valve (14) with selector valve (15), described first motor leakage hole (5-7) is communicated with the work fluid in the second motor leakage hole (6-7) and fuel tank (10) by the 9th pipeline (11-9), described first motor filler opening (5-6) is connected with the second motor filler opening (6-6) by the 8th pipeline (11-8), and be connected with the 5th pipeline (11-5),
Described second oil hydraulic motor (6) comprises the second motor output shaft (6-1), second motor filler opening (6-3), second motor return opening (6-6), second motor leakage hole (6-7), described second oil hydraulic motor (6) is installed on fuel tank (10) inner side, and be arranged on fuel tank left sideboard (10-2) by the second motor mounting screw (6-5), the second motor end face sealing gasket (6-2) is provided with between the end face of the second oil hydraulic motor (6) and fuel tank left sideboard (10-2), play seal action, prevent oil liquid leakage, described second motor output shaft (6-1) is provided with the 5th gear (6-4), described second motor return opening (6-6) is by the tenth pipeline (11-10), first pipeline (11-1) is communicated with the 11 pipeline (11-11) and the 13 pipeline (11-13) respectively, and then be connected with the filler opening of the second proportional pressure control valve (14) with selector valve (15), described second motor leakage hole (6-7) is communicated with the work fluid in the first motor leakage hole (5-7) and fuel tank (10) by the 9th pipeline (11-9), described second motor filler opening (6-6) is connected with the first motor filler opening (5-6) by the 8th pipeline (11-8), and be connected with the 5th pipeline (11-5), the right part of described hydraulic coupler output shaft (8) is provided with the 6th gear (7), the left part of hydraulic coupler output shaft (8) is connected with working machine by coupling, and described 6th gear (7) is meshed with the 4th gear (5-4) and the 5th gear (6-4) respectively,
When the first oil hydraulic motor (5) and the second oil hydraulic motor (6) work, drive the 6th gear (7) and hydraulic coupler output shaft (8) to produce respectively by the 4th gear (5-4) be meshed with the 6th gear (7) and the 5th gear (6-4) to rotate, hydraulic coupler output shaft (8) drives working machine to enter working state by coupling;
The filler opening of described first proportional pressure control valve (9) is connected with the 5th pipeline (11-5) by the 6th pipeline (11-6), and be connected with the first motor filler opening (5-3), the second motor filler opening (6-3) with the first oil pump oil outlet (1-6), the second oil pump oil outlet (2-6) respectively by the 5th pipeline (11-5), the working pressure of hydraulic control Coupler, the oil outlet of described first proportional pressure control valve (9) is communicated with the work fluid in fuel tank (10) by the 7th pipeline (11-7); Described fuel tank (10) internal storage has work fluid, the fuel tank right sideboard (10-1) of fuel tank (10) offers through hole, first oil pump input shaft (1-1) and the second oil pump input shaft (2-1) pass from the through hole fuel tank right sideboard (10-1) respectively, the fuel tank left sideboard (10-2) of fuel tank (10) offers through hole, and the first motor output shaft (5-1) and the second motor output shaft (6-1) pass from the through hole fuel tank left sideboard (10-2) respectively;
The filler opening of described second proportional pressure control valve (14) is by the 11 pipeline (11-11), first pipeline (11-1), return tube (11) is connected with the second motor return opening (6-6) with the first motor return opening (5-6) respectively with the tenth pipeline (11-10), the return opening of described second proportional pressure control valve (14) is by the 12 pipeline (11-12), 15 pipeline (11-15) is communicated with the work fluid in fuel tank (10), the filler opening of described selector valve (15) is by the 13 pipeline (11-13), first pipeline (11-1), return tube (11) is connected with the second motor return opening (6-6) with the first motor return opening (5-6) respectively with the tenth pipeline (11-10), the return opening of described selector valve (15) is by the 14 pipeline (11-14), 15 pipeline (11-15) is communicated with the work fluid in fuel tank (10),
Described first speed probe (12) is installed on hydraulic coupler input shaft (4) place, detects the rotating speed of hydraulic coupler input shaft (4) in real time, is equivalent to the output speed detecting prime mover in real time; Described second speed probe (13) is installed on hydraulic coupler output shaft (8) place, detects the rotating speed of hydraulic coupler output shaft (8) in real time, is equivalent to the input speed of real-time testing machine.
2. a kind of hydraulic coupler according to claim 1, it is characterized in that: described first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) are metering pump or variable displacement pump, when the first hydraulic-pressure pump (1) and the second hydraulic-pressure pump (2) are for variable displacement pump, realize the speed-regulating function of hydraulic coupler, the hydraulic-pressure pump quantity used in hydraulic coupler is more than two.
3. a kind of hydraulic coupler according to claim 1, it is characterized in that: described first oil hydraulic motor (5) and the second oil hydraulic motor (6) are fixed displacement motor or variable displacement motor, when the first oil hydraulic motor (5) and the second oil hydraulic motor (6) are for variable displacement motor, realize the speed-regulating function of hydraulic coupler, the oil hydraulic motor quantity used in hydraulic coupler is more than two.
4. a kind of hydraulic coupler according to claim 1, is characterized in that: described first proportional pressure control valve (9) and the second proportional pressure control valve (14) are manual tune relief valve.
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| CN201510419097.4A CN104930154A (en) | 2015-07-16 | 2015-07-16 | Hydraulic coupler |
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| CN201510419097.4A CN104930154A (en) | 2015-07-16 | 2015-07-16 | Hydraulic coupler |
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| FR2785958A1 (en) * | 1998-11-18 | 2000-05-19 | Toyoda Automatic Loom Works | Hydraulic drive for Four-wheel drive industrial vehicle, has individual wheel motors series connected on each side, forming two parallel hydraulic circuits |
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| CN201972861U (en) * | 2011-03-16 | 2011-09-14 | 上海天地人和创业投资有限公司 | Fan |
| CN102678458A (en) * | 2011-03-16 | 2012-09-19 | 上海天地人和创业投资有限公司 | Fan |
| CN203868275U (en) * | 2014-04-22 | 2014-10-08 | 交城县华昌泰机械制造有限公司 | Hydraulic stepless speed change transmission mechanism |
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| US3680313A (en) * | 1971-01-14 | 1972-08-01 | Emerson Electric Co | Closed loop-open loop circuit for hydro-static transmissions |
| DE3433495C2 (en) * | 1984-09-12 | 1989-09-07 | Hydromatik Gmbh, 7915 Elchingen, De | |
| FR2785958A1 (en) * | 1998-11-18 | 2000-05-19 | Toyoda Automatic Loom Works | Hydraulic drive for Four-wheel drive industrial vehicle, has individual wheel motors series connected on each side, forming two parallel hydraulic circuits |
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Application publication date: 20150923 |