WO2007069340A1

WO2007069340A1 - Two-way reversible common mechanism for internal combustion engine and pump

Info

Publication number: WO2007069340A1
Application number: PCT/JP2005/023655
Authority: WO
Inventors: Kazuichi Ito
Original assignee: Kazuichi Ito
Priority date: 2005-12-12
Filing date: 2005-12-22
Publication date: 2007-06-21
Also published as: JP2007162534A

Abstract

A two-way reversible common mechanism for an internal combustion engine and a pump. Pistons (24) fitted into a plurality of cylinders (23) disposed on a circumference around an axis (y) are connected to a swash plate (22) secured to an oscillating rod (21) through connection rods (26). An input shaft (20) is driven to make the oscillating rod (21) and the swash plate (22) perform a precession so as to reciprocatingly move the pistons (24). A pump function is developed by a diaphragm (33) connected to the pistons (24). Since the swash plate (22) merely performs the precession without rotating integrally with the input shaft (20), the angles of the connection rods (26) are only slightly varied and a drive force can be transmitted between the swash plate (22) and the pistons (24). Consequently, the occurrence of vibration can be minimized by reducing the friction produced in the drive force transmission system between the swash plate (22) and the pistons (24).

Description

Specification

Common reversible mechanism for internal combustion engine and pump

Technical field

[0001] The present invention relates to an internal combustion engine that transmits a driving force between a plurality of pistons slidably fitted to a plurality of cylinders arranged in an annular shape so as to surround an axis and a swing plate provided on a rotary shaft. It is related to the reversible common mechanism of both engine and pump

Background art

[0002] A conventional axial piston pump is a swash plate in which a piston is slidably fitted to a plurality of cylinders arranged on a circumference centering on an axis, and fixed to an input shaft arranged on the axis. When the input shaft is rotated by a drive source, a plurality of pistons that contact the swash plate reciprocate in the cylinder alternately to suck and discharge fluid. To do.

Disclosure of the invention

Problems to be solved by the invention

[0003] However, in the above conventional one, the piston is only allowed to reciprocate in the axial direction, whereas the swash plate rotates integrally with the input shaft. The swash plate slides at a speed equal to the peripheral speed, and there is a problem that a large vibration is generated as the swash plate rotates.

[0004] The present invention has been made in view of the above-described circumstances, and an object thereof is to minimize vibration generated in a driving force transmission system between a swing plate and a piston that mutually convert reciprocating motion and rotational motion. And

Means for solving the problem

[0005] In order to achieve the above object, according to the configuration of the first feature of the present invention, a plurality of cylinders arranged on a circumference centering on an axis, and a slidably fitted to the cylinders, respectively. A plurality of pistons to be combined, a rotating shaft disposed on the axis, and one end pivotally supported on the fixed portion on the axis and the other end pivoted on the rotating shaft at a position eccentric from the axis. A swinging rod, a swinging plate fixed to the swinging rod, and one end pivotally supported by the swinging plate. A reversible common mechanism for both the internal combustion engine and the pump is proposed in which the other end is provided with a plurality of connecting rods pivotally supported by the piston.

[0006] According to a second feature of the present invention, in addition to the configuration of the first feature, the connecting rod pivots on the swing plate and the piston so as to support a load in a tensile direction. A reversible common mechanism between the internal combustion engine and the pump, which is characterized by being supported, is proposed.

[0007] The main body casing 11 of the embodiment corresponds to the fixed portion of the present invention, and the input shaft 20 of the embodiment corresponds to the rotating shaft of the present invention.

The invention's effect

[0008] According to the configuration of the first feature of the present invention, when the rotary shaft is driven to rotate, the swinging rod and the swinging plate perform precession around the axis, and thus the swinging plate and the swinging plate are connected via the connecting rod The multiple pistons reciprocatingly move in the cylinder, and the pump functions to suck and discharge fluid. Conversely, when fluid is supplied to and discharged from a plurality of cylinders at a predetermined phase, the plurality of pistons reciprocate within the cylinder at a predetermined phase, and the swing plate connected to the pistons via the connecting rods moves the swing rod. Because of this precession, the function of the internal combustion engine and motor that drives the rotary shaft to rotate is exhibited.

[0009] In any of the above cases, the swinging plate only precesses without rotating integrally with the rotating shaft, so that the friction generated in the driving force transmission system between the swinging plate and the piston is reduced. This makes it possible to minimize the occurrence of vibration.

[0010] According to the configuration of the second feature of the present invention, since the connecting rod is pivotally supported by the swing plate and the piston so as to support the load in the tensile direction, the swing plate and the piston are separated from each other. When a relative movement is made in this direction, it is possible to secure the connection between the swing plate and the piston without providing a special resilient means for biasing the piston toward the swing plate.

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view of a fluid pump. (First example)

[FIG. 2] FIG. 2 is a sectional view taken along line 22 in FIG. (First example)

[FIG. 3] FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. (First example)

[FIG. 4] FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. (First example)

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. (First example) 6] Fig. 6 is an explanatory diagram of the linear motion mechanism. (First example)

Explanation of symbols

y axis

11 Body casing (fixed part)

20 Input shaft (rotating shaft)

21 Swing rod

22 Swing plate

23 cylinders

24 piston

26 Connecting rod

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.

Example 1

[0014] A fluid pump for supplying an incompressible fluid includes a stepped cylindrical main body casing 11, a front casing 13 closed by one end of the main body casing 11 and fixed by bolts 12 ..., and a main body The casing 11 is provided with a closure 14 that closes the other end of the casing 11 and a valve block 16 that is overlapped on the outer surface of the casing 14 via a seal member 15. · · · Fastened together with the main casing 11.

The input shaft 20 is rotatably supported by the front casing 13 via the two ball bearings 18 and 19 so as to be positioned on the axis y of the main body casing 11. A cylindrical recess 20a is formed on the end surface of the input shaft 20 which has a large diameter so that the axial y force is also decentered, and a spherical recess is formed at the center of the partition wall 1la formed in the middle portion of the body casing 11 in the axis y direction. 11 b is formed. Then, the first and second spherical end portions 21a and 21b formed at both ends of the swing port 21 are slidably fitted into the concave portion 20a of the input shaft 20 and the spherical concave portion ib of the partition wall 11a. The center of the circular oscillating plate 22 is fixed to the middle portion of the oscillating rod 21 by press-fitting. In this state, the oscillating plate 22 is perpendicular to the oscillating rod 21. [0016] Four cylinders 23 are formed at 90 ° intervals so as to surround the axis y in the partition wall 11a of the main casing 11, and the pistons 24 are slid into these cylinders 23, respectively. Fits freely. A non-rotating pin 25 planted on the outer peripheral surface of each piston 24 is slidably fitted into a guide groove 23a formed in the axis y direction on the inner peripheral surface of the cylinder 23. Due to the engagement of the groove 23a, the piston 24 is restricted from rotating in the cylinder 23 while being allowed to move in the axis y direction.

[0017] Four spherical recesses 22a are formed on the left end surface of the swing plate 22 at 90 ° intervals from each other, and the first spherical end portion of the right end of the connecting rod 26 is formed in each spherical recess 22a. 26a is fitted and secured with cap 27. The second spherical end portion 26 b at the left end of each connecting rod 26 is fitted into a spherical recess 24 a formed on the right end surface of the piston 24 and is prevented from being removed by the cap 28.

[0018] At the left end of the main casing 11, four bottomed cylindrical diaphragm chambers 29, which communicate with the four cylinders 23, respectively, open. In each diaphragm chamber 29, there are an annular first diaphragm support member 30, a disk-shaped first diaphragm 31, a ring-shaped second diaphragm support member 32, a disk-shaped second diaphragm 33, and a ring-shaped third diaphragm. Diaphragm support members 34 are sequentially fitted and pressed and fixed by the valve block 16. The outer periphery of the first diaphragm 31 is clamped and fixed by the first and second diaphragm support members 30 and 32, and the outer periphery of the second diaphragm 33 is clamped by the second and third diaphragm support members 32 and 34. Fixed.

A slide block 35 is disposed between the first and second diaphragms 31, 33, and a spacer block 36 is disposed between the first diaphragm 31 and the piston 24. The slide block 35, the second diaphragm 33 and the spacer block 36 are fixed to the left end face of the piston 24 with a common bolt 37. The slide block 35 is slidably fitted to the inner peripheral surface of the second diaphragm support member 32, and is only allowed to move in the axis y direction.

[0020] The working chamber 38 is partitioned so as to be surrounded by the second diaphragm 33, the third diaphragm support member 34, and the valve block 16, and the suction valve 39 provided in the valve block 16 and the working chamber 38 are connected to the suction passage 16a. The discharge valve 40 provided in the valve block 16 and the working chamber 38 communicate with each other through the discharge passage 16b. Suction valve 39 and discharge valve 40 are in each working chamber 38 The upstream side of the four intake valves 39 is connected to a common intake passage, and the downstream side of the four discharge valves 40 is connected to a common discharge passage.

FIG. 6 shows a linear motion mechanism disclosed in Japanese Patent No. 3286568. x—Draw a straight line specified by y = tan θ χ and a straight line specified by y =-tan θ x in the first and second quadrants of the y Cartesian coordinate system, and create a line segment of length 2R cos Θ The point A and the point B at both ends are moved along the two straight lines. Θ is any angle between 0 and Θ and π Ζ2, where θ = π / 4. Then, the point C that is on the perpendicular bisector of the line segment って and separated by the distance R sin Θ to the origin side of the line segment を moves on the straight line defined by y = 0, and the line segment AB A point D which is on the perpendicular bisector of the line and is a distance R (cos ² Θ / si η θ) away from the line AB toward the opposite origin moves on a straight line defined by x = 0. In addition, there is an envelope of an arc E (subordinate arc) of radius R that passes through both ends of the line segment AB and protrudes toward the non-origin side, and the envelope is defined by the straight line y = R.

[0022] This means that the graphic force S with four points A to D and one arc E, point A along the straight line y = tan θ χ, and point 沿い along the straight line y = —tan θ x , Point C can move along line y = 0, point D along line x = 0, and arc E along line y = R.

[0023] The five straight lines y = tan θx, y = —tan Θx, y = 0, x = 0, y = R are selected to select the first cam and the second cam If two cams are used and two corresponding points (or one point and one arc) are moved along the first and second cams, any of the remaining three straight lines can be moved. One point (or one arc) corresponding to it moves along a straight line.

In this embodiment, in FIG. 1, the center of the first spherical end portion 26a of the upper connecting rod 26 is a point A, and the center of the first spherical end portion 26a of the lower connecting rod 26 is a point B. The center of the first spherical end 21a of the swing rod 21 is point C, and the center of the second spherical end 21b of the swing rod 21 is point D. Therefore, the straight line CA in FIG. 1 corresponds to the straight line y = tan θ χ, the straight line CB corresponds to the straight line y = −tan θ x, and the angle ACB is 90 °.

[0025] When the input shaft 20 is rotated, in FIG. 1 and FIG. 2, the axis y force eccentric point C reciprocates on the axis X orthogonal to the axis y, and the point D is constrained on the axis y. Therefore, the point A (the center of the first spherical end 26a of the upper connecting rod 26 in Fig. 1) is a straight line y = tan θ x Reciprocating up, point B (center of the first spherical end 26a of the lower connecting rod 26 in Fig. 1) reciprocates on the straight line y = —tan θ x, which causes the piston 24 to reciprocate. Is done.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

[0027] When the input shaft 20 is rotationally driven by a drive source (not shown) such as an electric motor, the first spherical rod 21 supported by the spherical concave portion ib of the main casing 11 has the second spherical end 21b. As the spherical end 21a moves on the circumference around the axis y, the swing rod 21 precesses on a conical surface having the second spherical end 21b as a vertex. As a result, the oscillating plate 22 fixed to the oscillating rod 21 also precesses, and the pistons 24 connected to the oscillating plate 22 via the connecting rods 26 ... make one rotation of the input shaft 20. As one cycle, reciprocates in the cylinder y direction in the axis y direction. At this time, the phase in which the four pistons 24 reciprocate is shifted by 90 ° according to the inclination of the swing plate 22.

[0028] When each piston 24 reciprocates in the cylinder 23, the first and second diaphragms 31 and 33 connected to the piston 24 reciprocate, and the working chamber 38 defined on the left side of the second diaphragm 33 Volume increases or decreases. When the second diaphragm 33 moves to the right and the volume of the working chamber 38 increases, the discharge valve 40 is closed and the suction valve 39 is opened, so that fluid is sucked into the working chamber 38, and subsequently When the second diaphragm 33 moves to the left and the volume of the working chamber 38 decreases, the suction valve 39 closes and the discharge valve 40 opens to discharge fluid from the working chamber 38. In this way, the four working chambers 38... Discharge fluid alternately at different phases, so that the pulsation of the discharge pressure of the fluid pump can be reduced.

[0029] By providing the first and second diaphragms 31 and 33, even if the second diaphragm 33 facing the working chamber 38 is damaged, the fluid in the working chamber 38 is blocked by the first diaphragm 31. The piston 24 and the rocking plate 22 are not likely to get dirty.

[0030] Further, since the rocking plate 22 only precesses integrally with the rocking rod 21 without rotating integrally with the input shaft 20, the connecting rod 26 can be swung only by a slight change in angle. The driving force can be transmitted between the piston 24 and the piston 24. As a result, it is possible to minimize the occurrence of vibration compared to the case where the rocking plate 22 rotates.

[0031] The first and second spherical portions 26a and 26b at both ends of the connecting rod 26 are pivotally supported by the swing plate 22 and the piston 24 ··· so that they cannot be pulled out even when pulled. Therefore, the swing plate 22 is the piston 24. Even when moving relative to each other in the direction of force separation, the connection between the two is not lost. As a result, special elastic means such as a return spring that urges the piston 24 toward the swing plate 22 can be eliminated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made.

[0033] For example, in the embodiment, the second diaphragm 33 ... driven by the pistons 24 ... allows the pump function to be exerted, and the pumping force can be exerted directly by the pistons 24 ... ■.

[0034] Although the fluid pump has been described in the embodiment, the present invention can be applied to an internal combustion engine. In this case, when the four pistons 24 are alternately pressed by the combustion pressure of the fuel, the reciprocating motion of the pistons 24 is caused to rotate by the rocking plate 22 on the input shaft 20 (in this case, the output shaft). In this case, the generation of vibrations can be suppressed.

[0035] The working fluid of the reversible common mechanism of the internal combustion engine and the pump of the present invention may be either liquid or gas.

Claims

The scope of the claims

[1] A plurality of cylinders (23) arranged on a circumference centered on the axis (y),

A plurality of pistons (24) slidably fitted to the cylinder (23), and a rotating shaft (20) disposed on the axis (y);

An oscillating rod (21) whose one end is pivotally supported by the fixing part (11) on the axis (y) and whose other end is eccentric from the axis (y). When,

A swing plate (22) fixed to the swing rod (21);

A plurality of connecting rods (26) having one end pivotally supported by the swing plate (22) and the other end pivotally supported by the piston (24);

A reversible common mechanism for both the internal combustion engine and the pump.

[2] The connecting rod (26) according to claim 1, wherein the connecting rod (26) is pivotally supported by the swing plate (22) and the piston (24) so as to support a load in a tensile direction. A reversible common mechanism between the internal combustion engine and the pump.