WO2022257188A1

WO2022257188A1 - Tractor transmission

Info

Publication number: WO2022257188A1
Application number: PCT/CN2021/101820
Authority: WO
Inventors: 王文亮; 胡黎明; 陶亮锦
Original assignee: 温岭市明华齿轮有限公司
Priority date: 2021-06-10
Filing date: 2021-06-23
Publication date: 2022-12-15
Also published as: CN113175515A

Abstract

A tractor transmission, comprising a housing. An input bevel gear shaft, a shaft, a middle gear shaft, and an output gear shaft are connected in the housing; the input bevel gear shaft is linked with the shaft by means of a spline housing; the shaft is in engagement transmission with a first gear ring of an epicyclic speed reduction mechanism by means of an engagement tooth; the input bevel gear shaft is in engagement transmission with an HMT input bevel gear; an HMT output bevel gear is transmittingly connected to a first sun gear of the epicyclic speed reduction mechanism; an output gear is sleeved on a first planet carrier of the epicyclic speed reduction mechanism; an input gear is sleeved on the middle gear shaft; the middle gear shaft is transmittingly connected to the output gear shaft; and the output gear shaft is provided with a planetary speed reduction mechanism and an engaging tooth sleeve. By using a parallel combination of mechanical transmission, hydraulic transmission, and the epicyclic speed reduction mechanism, the tractor transmission has the advantage of high efficiency of mechanical transmission and the shifting comfort brought by continuously variable transmission of the hydraulic transmission, such that the applicability of the whole machine is greatly improved.

Description

A tractor gearbox

Technical field:

The invention belongs to the technical field of agricultural tractors, in particular to a tractor gearbox.

Background technique:

With the continuous development of my country's agricultural machinery level, tractors, as important agricultural production machinery, have more and more demands in agricultural operations. At present, the drive axle boxes of high-horsepower tractors in my country are generally mechanically shifted in steps. The shifting process is completely borne by the driver. The best fuel economy or power matching wastes energy, so there are problems such as low operating efficiency, high labor intensity, and poor power.

Invention content:

The purpose of the present invention is to provide a tractor gearbox, which realizes interval stepless speed change through the combination of mechanical transmission, hydraulic drive and planetary reduction mechanism, which not only has the high efficiency of mechanical transmission, but also has hydraulic stepless speed change.

The present invention is achieved like this:

A tractor gearbox, comprising a housing, the housing is rotationally connected with an input bevel gear shaft, a shaft, an intermediate gear shaft and an output gear shaft, the input bevel gear shaft is linked with a shaft through a spline sleeve, and the first shaft passes through The meshing gear is meshed with the ring gear of the planetary reduction mechanism, the input bevel gear shaft is meshed with the HMT input bevel gear through the transmission input bevel gear, and the HMT output bevel gear is connected with the sun gear of the planetary reduction mechanism. The planet carrier of the mechanism is equipped with an output gear, and the intermediate gear shaft is equipped with an input gear that meshes with the output gear. The intermediate gear shaft and the output gear shaft are connected through a transmission gear set, and the output gear shaft is provided with a planetary reduction gear. The mechanism is connected with the engagement tooth sleeve, and the axial movement of the engagement tooth sleeve can be engaged with the output gear shaft or the planet carrier of the planetary reduction mechanism.

According to the above-mentioned tractor gearbox, the planetary reduction mechanism includes a ring gear 1, a sun gear shaft, a sun gear 1 arranged on the sun gear shaft, and a sun gear 1 arranged between the sun gear 1 and the ring gear 1 and Rotate the planetary gear 1 connected to the planetary carrier 1, and the input end of the central gear shaft is equipped with a transmission output bevel gear meshed with the HMT output bevel gear.

According to the above tractor gearbox, the planetary reduction mechanism includes the second sun gear arranged on the output gear shaft, the second ring gear arranged on the housing, and the second sun gear arranged between the second sun gear and the second ring gear. And rotate the planetary gear 2 that is connected on the planetary carrier 2, and the described engaging gear sleeve can be combined with the sun gear 2 or the planetary carrier 2.

According to the aforementioned tractor gearbox, the gear set includes a first-speed driving gear and a first-speed passive gear, a second-speed driving gear and a second-speed passive gear, a third-speed driving gear and a third-speed passive gear , the driving gear of fourth gear and the passive gear of fourth gear, the driving gear of second gear, the driving gear of third gear and the driving gear of fourth gear are all set on the intermediate gear shaft, the passive gear of first gear, the passive gear of second gear and the passive gear of third gear are all set on the On the output gear shaft, there is an integrated structure between the first gear driving gear and the intermediate gear shaft, and between the fourth gear passive gear and the output gear shaft. The intermediate gear shaft can be connected with the third gear driving gear or the fourth gear shaft through the third and fourth gear synchronizers. The driving gear is combined, and the output gear shaft can be combined with the first gear driven gear or the second gear driven gear through the first and second gear synchronizers.

According to the above-mentioned tractor gearbox, the housing includes a front housing and a rear case, the input bevel gear shaft, the first shaft, and the planetary reduction mechanism are all arranged on the front housing, and the intermediate gear The shaft, the output gear shaft, the gear set and the planetary reduction mechanism are all arranged on the rear case.

The outstanding advantages of the present invention compared with prior art are:

1. The present invention adopts the parallel combination of mechanical transmission, hydraulic transmission and planetary deceleration mechanism, so that it has the advantages of high efficiency of mechanical transmission and comfortable shifting of stepless speed change of hydraulic transmission, and is an upgraded product of the current mechanical transmission;

2. The present invention adopts the high efficiency of mechanical power transmission and the infinitely variable speed of hydraulic transmission to form a multi-interval infinitely variable speed assembly, so that each gear interval can realize the maximum speed from 0 speed to the corresponding gear, and the driving of the tractor The speed can be adjusted between 0-50 km/h, which meets the speed requirements of various operations on the tractor, greatly improves the performance of the product, and greatly improves the applicability of the whole machine.

Description of drawings:

Fig. 1 is the overall structure diagram of the present invention.

In the figure: 1. Input bevel gear shaft; 2. Primary shaft; 3. Intermediate gear shaft; 4. Output gear shaft; 5. Spline sleeve; 6. Meshing teeth; 7. Transmission input bevel gear; 8. HMT input cone Gear; 9, HMT output bevel gear; 10, output gear; 11, input gear; 12, engagement gear sleeve; 13, ring gear one; 14, central gear shaft; 15, sun gear one; 16, planet carrier one; 17 1, planetary gear 1; 18, transmission output bevel gear; 19, sun gear 2; 20, ring gear 2; 21, planetary carrier 2; 22, planetary gear 2; 23, first gear driving gear; 24, first gear passive gear; 25. Second gear driving gear; 26. Second gear passive gear; 27. Third gear driving gear; 28. Third gear passive gear; 29. Fourth gear driving gear; 30. Fourth gear passive gear; 31. First and second gear synchronizers; 32. Synchronizer for third and fourth gears; 33. Front housing; 34. Rear box.

Detailed ways:

The present invention will be further described below with specific embodiment, referring to Fig. 1:

A tractor gearbox, comprising a housing, in which an input bevel gear shaft 1, a first shaft 2, an intermediate gear shaft 3 and an output gear shaft 4 are rotatably connected, and the input bevel gear shaft 1 is connected to a spline sleeve 5 through a The shaft 2 is linked, the first shaft 2 is meshed with the ring gear 13 of the planetary reduction mechanism through the meshing gear 6, the input bevel gear shaft 1 is meshed with the HMT input bevel gear 8 through the transmission input bevel gear 7, and the HMT output bevel gear 9 is meshed with the HMT The sun gear 15 of the planetary reduction mechanism is connected in transmission, the planet carrier 16 of the planetary reduction mechanism is equipped with an output gear 10, the intermediate gear shaft 3 is equipped with an input gear 11 meshing with the output gear 10, the intermediate gear shaft 3 and The output gear shafts 4 are connected through a transmission gear set. The output gear shaft 4 is provided with a planetary reduction mechanism and an engaging gear sleeve 12, and the engaging gear sleeve 12 can move axially with the output gear shaft 4 or the planet carrier of the planetary reduction mechanism. Two 21 are joined together. Among them, the HMT input bevel gear 8 and the HMT output bevel gear 9 serve as the input and output ends of the HST hydraulic system in the prior art; meanwhile, the above-mentioned meshing teeth 6 are directly set on the outer peripheral wall of the shaft 2 .

In the present invention, through the combination of mechanical transmission, hydraulic transmission and planetary reduction mechanism, the power output by the engine is divided into two transmission routes at the input bevel gear shaft 1. One axis 2 is transmitted to the ring gear 13 of the planetary reduction mechanism, and the other is transmitted to the gear wheel by the HMT output bevel gear 9 through the HST hydraulic system after the transmission input bevel gear 7 meshes with the HMT input bevel gear 8 to drive and reversing. On the sun wheel one 15 of planetary reduction mechanism. Thus, the two transmission lines are combined in the planetary reduction mechanism and then output to the intermediate gear shaft 3, the gear set and the output gear shaft 4 in sequence. Cooperate to achieve high and low gear switching. That is to say, the present invention adopts the high efficiency of mechanical power transmission and the infinitely variable speed of hydraulic transmission to form a multi-interval infinitely variable speed assembly, so that each gear interval can realize the maximum speed from 0 speed to the corresponding gear, and the driving speed of the tractor It can be adjusted between 0-50 km/h to meet the speed requirements of various operations on the tractor, greatly improve the performance of the product, and greatly improve the applicability of the whole machine.

Wherein, in order to enable the planetary reduction mechanism to be able to HMT output the bevel gear 9 and the first shaft 2 to drive and cooperate, the specific setting structure of the planetary reduction mechanism is: the planetary reduction mechanism includes a ring gear 13, a central gear shaft 14, The sun gear one 15 that is arranged on the sun gear shaft 14, and the planetary gear one 17 that is arranged between the sun gear one 15 and the ring gear one 13 and is rotatably connected on the planet carrier one 16, the input end of the sun gear shaft 14 is sleeved There is a transmission output bevel gear 18 meshing with the HMT output bevel gear 9 .

At the same time, in order to make the engaging tooth sleeve 12 move axially and engage with the output gear shaft 4 or the second planet carrier 21 of the planetary reduction mechanism, and then realize the switching of high and low gears, in this embodiment, the specific setting of the planetary reduction mechanism The structure is: the planetary reduction mechanism includes a sun gear 19 arranged on the output gear shaft 4, a ring gear 20 arranged on the housing, and a sun gear 2 19 and a ring gear 20 arranged between the second sun gear 19 and the ring gear 20 to rotate The second planetary gear 22 connected to the second planetary carrier 21 , the engaging tooth sleeve 12 can be combined with the second sun gear 19 or the second planetary carrier 21 .

Furthermore, in this embodiment, this product is equipped with four speed gears, that is, the specific setting structure of the gear set is as follows: the gear set includes a first gear driving gear 23 and a first gear passive gear that are meshed. Gear 24, second gear driving gear 25 and second gear passive gear 26, third gear driving gear 27 and third gear passive gear 28, fourth gear driving gear 29 and fourth gear passive gear 30, second gear driving gear 25, third gear driving gear 27 And the fourth gear driving gear 29 is all set on the intermediate gear shaft 3, the first gear driven gear 24, the second gear driven gear 26 and the third gear driven gear 28 are all sleeved on the output gear shaft 4, the first gear driving gear 23 and the intermediate gear shaft 3, between the fourth-speed passive gear 30 and the output gear shaft 4 are all integral structures, that is, the tooth surface of the first-speed driving gear 23 is directly set on the outer peripheral wall surface of the intermediate gear shaft 3, and the tooth surface of the fourth-speed passive gear 30 The surface is directly set on the outer peripheral wall of the output gear shaft 4; the intermediate gear shaft 3 can be combined with the third gear driving gear 27 or the fourth gear driving gear 29 through the third and fourth gear synchronizers 32, and the output gear shaft 4 can be combined with the first and second gear synchronizers. 31 can be combined with first gear driven gear 24 or second gear driven gear 26.

In addition, the housing includes a front housing 33 and a rear case 34. The input bevel gear shaft 1, the first shaft 2 and the planetary reduction mechanism are all arranged on the front housing 33. The intermediate gear shaft 3, The output gear shaft 4 , the gear set and the planetary reduction mechanism are all arranged on the rear case 34 .

The above-described embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Therefore: all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the present invention. within the scope of protection.

Claims

A gearbox for a tractor is characterized in that: it includes a housing, the housing is rotationally connected with an input bevel gear shaft (1), a shaft (2), an intermediate gear shaft (3) and an output gear shaft (4), The input bevel gear shaft (1) is linked with the first shaft (2) through the spline sleeve (5). The gear shaft (1) is meshed with the HMT input bevel gear (8) through the transmission input bevel gear (7), and the HMT output bevel gear (9) is connected to the sun gear one (15) of the planetary reduction mechanism. An output gear (10) is set on the planet carrier one (16), and an input gear (11) meshed with the output gear (10) is set on the intermediate gear shaft (3), and the intermediate gear shaft (3) and the output gear shaft ( 4) are connected through a transmission gear set. The output gear shaft (4) is provided with a planetary reduction mechanism and an engaging gear sleeve (12). The planet carrier two (21) of the planetary reduction mechanism is engaged.
A tractor gearbox according to claim 1, characterized in that: the planetary reduction mechanism includes a ring gear one (13), a central gear shaft (14), and a sun set on the central gear shaft (14). Wheel one (15), and the planetary gear one (17) that is arranged between the sun gear one (15) and the ring gear one (13) and rotates and is connected on the planetary carrier one (16), the sun gear shaft (14) The input end is sleeved with a transmission output bevel gear (18) meshed with the HMT output bevel gear (9).
A tractor gearbox according to claim 1, characterized in that: the planetary reduction mechanism includes a sun gear 2 (19) set on the output gear shaft (4), a ring gear 2 set on the housing, (20), and the second planetary gear (22) arranged between the second sun gear (19) and the second ring gear (20) and rotatably connected to the second planetary carrier (21), the engaging tooth sleeve (12) can Combine with sun gear two (19) or planet carrier two (21).
A tractor gearbox according to claim 1, characterized in that: the gear set includes a first gear driving gear (23), a first gear driven gear (24), a second gear driving gear (25) ) and second gear driven gear (26), third gear driving gear (27) and third gear driven gear (28), fourth gear driving gear (29) and fourth gear driven gear (30), second gear driving gear (25), The third gear driving gear (27) and the fourth gear driving gear (29) are all sleeved on the intermediate gear shaft (3), and the first gear driven gear (24), the second gear driven gear (26) and the third gear driven gear (28) are all set on the intermediate gear shaft (3). Set on the output gear shaft (4), between the first-speed driving gear (23) and the intermediate gear shaft (3), between the fourth-speed driven gear (30) and the output gear shaft (4) are all integral structures, and the middle The gear shaft (3) can be combined with the third gear driving gear (27) or the fourth gear driving gear (29) through the third and fourth gear synchronizers (32), and the output gear shaft (4) can pass through the first and second gear synchronizers (31). Combined with the first gear driven gear (24) or the second gear driven gear (26).
A tractor gearbox according to claim 1, characterized in that: the housing includes a front housing (33) and a rear case (34), the input bevel gear shaft (1), a shaft ( 2), the planetary reduction mechanism is all arranged on the front housing (33), and the intermediate gear shaft (3), the output gear shaft (4), the gear set and the planetary reduction mechanism are all arranged on the rear case (34 )superior.