JPH0241354Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is an axial piston machine, specifically a swash plate whose inclination angle can be adjusted, and an operating plunger that adjusts the inclination angle of the swash plate. This invention relates to an axial piston machine equipped with an axial piston machine.

(Prior art) Conventionally, this type of axial piston machine
The one described in Japanese Utility Model Application Publication No. 56-169479 is known.

As shown in FIG. 4, the axial piston machine described in the above publication supports a main shaft X2 inside a machine body X1, and a cylinder block , each of the pistons X on the main shaft X2
A swath plate X5 that is in constant contact with each piston X3 is arranged on the back side of the machine body X1.
A cylindrical receiver X6 is installed inside the receiver X6.
An operation plunger X7 extending in the same direction as the main shaft X2 is slidably supported in a cantilevered manner.

Further, the operating plunger X7 is provided with a connecting hole X71 at an intermediate portion in the longitudinal direction.
At the same time, a connecting member X8 having a spherical receiving portion X81 is attached to the connecting member
A sphere X9 having a through hole X91 is rotatably held, and a connecting rod X10 extending toward the sphere X9 is protruded from the swash plate X5, and the connecting rod X10 is inserted through the sphere X9. It is slidably inserted into the hole X91 and the swash plate X5 is inserted through the connecting rod X10.
and the operation plunger X7 are interlocked and connected.

(Problems to be Solved by the Invention) By the way, in the conventional axial piston machine, when connecting the operating plunger X7 and the connecting rod X10 extending from the swash plate X5, the sphere X9 is Since the connection is made through the sphere, not only the sphere X9 but also the connecting member X8 that receives this sphere
It is also necessary to process the receiving part X81 into a spherical surface,
There was a problem that the processing became complicated and the cost increased.

The present invention has been devised in view of the above-mentioned problems, and its purpose is to simplify the structure of the connection between the operation plunger and the connection rod by adding a device to the operation plunger. An object of the present invention is to provide an axial piston machine that can be easily machined and manufactured at low cost.

(Means for Solving the Problems) As shown in FIGS. 1 and 2, the axial piston machine of the present invention includes a swash plate 2 whose inclination angle is adjustable, and a Operation plunger 3 for adjusting the inclination angle
In this axial piston machine, the operating plunger 3 is divided into a first divided body 31.
One of the joining surfaces of the second divided body 32 joined to the first divided body 31 is made into a spherical surface, and a connecting pin 22 is provided on the connecting arm 21 extending from the swash plate 2, and the second divided body 32 is connected to the first divided body 31. This is characterized in that a connecting portion 32b is provided for movably receiving the pin 22.

(Function) Therefore, the second divided body 3 of the operating plunger 3
The connecting pin 22 of the connecting arm 21 extending from the swash plate 2 is connected to the connecting portion 32b provided in the swash plate 2.
The swash plate 2 and the operating plunger 3 are connected to each other by freely inserting the swash plate 2 and the operating plunger 3. Therefore, the structure of the connecting portion between the swash plate 2 and the operating plunger 3 is simple and easy to process. It becomes. Furthermore, by forming a spherical surface on the joint surface of each divided body 31 and 32 in the operation plunger 3, each divided body 3
Even if there is a slight misalignment between the axes 1 and 32, they are in point contact with each other via the spherical surface, and each of the divided bodies 3
1 and 32 are reliably carried out, that is, the movement of the swash plate 2 by the operation plunger 3 is ensured.
This ensures reliable operation.

Incidentally, also in the present invention, each of the divided bodies 31, 3
A spherical surface is formed on the joining surface of the two parts, but this spherical surface is formed only on one of the divided bodies 31 and 32, and since the spherical surface is only in point contact with the other side, precise machining is required. Precision is not required, and therefore manufacturing costs are lower than conventional ones.

(Embodiments) The axial piston machine according to the present invention will be explained below with reference to embodiments of the drawings.

The axial piston machine shown in FIG. 2 has a cradle-type swash plate 2 provided inside a housing 1 so as to be able to adjust its inclination angle, and an operating plunger 3 disposed in the housing 1 near the swash plate 2. is provided, and the swath plate 2 is moved by the operation of the operating plunger 3.
It's like adjusting the angle of inclination.

In the axial piston machine as described above, a connecting arm 21 having a bifurcated tip is integrally provided on the swash plate 2, and a connecting pin is provided at the tip of the connecting arm 21 at right angles to the connecting arm 21. 22 is supported.

As shown in detail in FIG. 1, the operating plunger 3 is divided into first, second, and third divided bodies 31, 32, and 33 in the length direction, respectively, and the first divided body 31 is divided into three parts. The third divided body 33 is slidably supported on one side wall of the housing 1, and the third divided body 33 is supported on the other side wall of the housing 1, and the second divided body 32 is formed in a rectangular shape. While the divided body 32 is interposed between the connecting arms 21 of the swath plate 2, the first and third divided bodies 31 and 33 are joined and connected to the left and right sides of the second divided body 32, respectively. be.

The first divided body 31 constituting the operation plunger 3 is integrally formed with a protrusion 31a that protrudes laterally on the joint surface to the second divided body 32,
A spherical surface 31b is formed on the distal end surface of the protrusion 31a, and a recess 3 capable of receiving the protrusion 31a is formed on the surface of the second divided body 32 facing the protrusion 31a.
2a, and the spherical surface 31b of the protrusion 31a is brought into point contact with the bottom surface of the recess 32a.

By doing so, even if there is a slight misalignment of the axis between the divided bodies 31 and 32 of the operation plunger 3, the divided bodies 31 and 32 can be brought into point contact with each other via the spherical surface 31b of the projection 31a. Therefore, the movement of each of the divided bodies 31 and 32 is reliably performed, that is, the operation of the swash plate 2 by the operating plunger 3 is reliably performed.

Further, a rectangular connecting portion 32b is formed on the other side of the second divided body 32, and this connecting portion 32b
is freely inserted and supported by the connecting pin 22 supported by the swash plate 2.

Furthermore, the third divided body 33 is configured by integrally providing a rectangular protrusion 33b on one side of the disk portion 33a and providing a support rod 33c on the other side, and the protrusion 33b is provided with the second divided portion. The connecting pin 22 of the swash plate 2 is placed in contact with the connecting portion 32b of the body 32, and inserted in the space surrounded by the connecting portion 32b and the protrusion 33b.

Further, a support body 34 capable of receiving the support rod 33c of the third divided body 33 is attached to the side wall of the housing 1, and the support rod 33c is attached to the support body 34.
c is supported so that it can slide freely.

As described above, the first divided body 31 is supported on one side wall of the housing 1, and the support rod 33c of the third divided body 33 is supported on the other side wall of the housing 1 via the support body 34. As a result, the operating plunger 3 is supported on both sides. Therefore, when adjusting the inclination angle of the swash plate 2 by moving the operating plunger 3 from side to side, an uneven load is generated on the operating plunger 3, causing wear. It is possible to prevent this from happening.

In the above embodiment, a protrusion 31a is provided on the first divided body 31 side, a spherical surface 31b is formed at the tip of the protrusion 31a, and a recess 32a for receiving the protrusion 31a is provided on the second divided body 32 side. However, the protrusion 31a is formed in the second divided body 32.
side, and the recess 32a is connected to the first divided body 31.
It can also be formed on the side.

Inside the housing 1, a control pressure acting chamber 1 is provided at one end in the length direction of the operating plunger 3.
1, and connects a control passage 12 extending from a constant horsepower control valve 4, which will be described later, to the action chamber 11, and at the other end in the length direction of the operation plunger 3,
A return spring 13 is interposed between the disk portion 33a of the third divided body 33 and the support body 34, while the third divided body 3 is inserted inside the support body 34.
On the back side of the support rod 33c in 3, there is a pressing chamber 14 which, together with the return spring 13, applies a pressing force due to fluid pressure to the operating plunger 3.
form.

When the control pressure is not applied to the control pressure application chamber 11, the operation plunger 3 is moved as shown in FIG. Accordingly, the swash plate 2 connected via the connecting pin 22 is also positioned at the maximum displacement position, and the discharge amount becomes maximum.

Further, the control passage 1 is connected to the control pressure action chamber 11.
2, and when this control pressure overcomes the fluid pressure created in the pressure chamber 14 and the pressing force of the return spring 13, the operating plunger 3 moves to the right in FIG. Accordingly, the swash plate 2 is controlled from the maximum displacement position to the neutral position, and the discharge amount is adjusted from the maximum flow rate to the minimum flow rate.

The operating plunger 3 is controlled by a constant horsepower control valve 4 as shown in FIG.

The constant horsepower control valve 4 shown in FIG. 3 is provided near the location where the operating plunger 3 is located in the housing 1 of the axial piston machine.
forming a spool chamber 41 in the housing 1;
A guide sleeve 42 having a spool hole 42a is slidably inserted into the spool chamber 41, and a two-land type spool 43 is slidably inserted into the spool hole 42a of the guide sleeve 42. A piston 44 is provided on one side in the length direction of the spool 43, and in a rear chamber 45 of the piston 44,
On the other hand, two constant horsepower springs 46 and 47 are provided on the other side in the length direction of the spool 43 to set a constant horsepower characteristic. ing.

Further, on one side in the length direction of the guide sleeve 42, a connecting arm 21 of the swash plate 2 is provided.
Feedback pins 23 protruding from are brought into contact with each other,
The movement of the swash plate 2 is fed back to the guide sleeve 42.

The housing 1 also includes the spool 43.
a pressure passage 49 that communicates a pressure chamber 48 formed between each land with the constant ratio pressure reducing valve 6;
When the spool 43 moves due to the movement of the piston 44, the control passage 50 communicates with the pressure chamber 48, and the land of the spool 43 and the guide sleeve 42 are connected to each other. The control pressure fluid flowing through the orifice formed between the control passage 50 and the communication hole is guided from the control passage 50 to the control pressure application chamber 11 of the swath plate 2, and the operation plunger 3 is operated. .

The housing 1 also includes the spool 41.
A cylinder hole 51 is formed on the same axis as the cylinder hole 51, a cylinder 52 is attached to the cylinder hole 51, and the piston 44 is slidably housed in the cylinder 52, and on the back side of the cylinder 52,
An operation passage 53 connected to the secondary side opening of the constant ratio pressure reducing valve 6 is communicated, and the secondary side pressure of the constant ratio pressure reducing valve 6 acts on the rear chamber 45 of the piston 44 from this operation passage 53. and the constant horsepower spring 4
When a pushing force that overcomes the pushing force by 6 and 47 is applied, the piston 44 is moved together with the spool 43.

In addition, in FIG. 3, 54 is the constant horsepower spring 4.
6, 47 is a tank passage which opens the spring chamber 55 containing the springs 6 and 47 to the tank, and 56 is a return spring of the guide sleeve 42.

Further, the constant horsepower control valve 4 includes this control valve 4.
A constant ratio pressure reducing valve 6 is installed in parallel. In the embodiment shown in the figure, constant ratio control is possible using control fluids flowing from the axial piston machine of its own system and the axial piston machine of another system.

The pressure reducing valve 6 is provided near the location where the constant horsepower control valve 4 is arranged, and a spool hole 62 is formed in the valve body 61 attached to the housing 1 of the axial piston machine. A land-type spool 63 is installed inside the spool 63 so as to be able to freely slide, and a first discharge pressure acting chamber 64 having a first pressure receiving surface A1 and a second discharge pressure acting chamber 64 having a second pressure receiving surface A2 are partitioned by each land of the spool 63. Two discharge pressure action chambers 65 and a negative pressure action chamber 66 are formed respectively, and the first action chamber 64 is used as a discharge passage for the axial piston machine of the own system, and the second action chamber 65 is used as the discharge passage for the axial piston machine of the other system. A discharge passage in an axial piston machine is connected thereto, and a negative pressure passage is connected to the negative pressure acting chamber 66.

The valve body 61 also includes the spool 63.
A secondary side opening 67 is formed which communicates with the first action chamber 64 and the negative pressure action chamber 66 through lands, and this opening 67 is connected to the back surface of the piston 44 in the constant horsepower control valve 4. room 4
5 through the operation passage 53.

In addition, in the embodiment, the spool 63
A stepped sensor pin 69 whose one end in the length direction is in contact with the lid body 68 is installed so as to be relatively movable, and the tip of the sensor pin 69 is connected to the first action chamber 64.
By making the stepped portion of the sensor pin 69 face the first action chamber 65, the tip surface of the sensor pin 69 can be exposed to the first pressure receiving surface A described above.
1, and the annular end surface of the stepped portion forms the second pressure receiving surface A2.

Further, a communication passage 7 formed in the spool 63 is provided on the opposite side of the spool 63 in the valve body 61.
A secondary side working chamber 71 is formed which communicates with the secondary side opening 67 through 0, and this working chamber 71
A return spring 72 for the spool 63 is provided.

(Effect of the invention) As explained above, in the axial piston machine according to the invention, the operating plunger 3 for controlling the swash plate 2 is connected to the first and second divided bodies 3.
1 and 32, and this first divided body 31 and the second
One of the joint surfaces with the divided body 32 is formed into a spherical surface 31b, and a connecting pin 22 is provided on the connecting arm 21 extending from the swash plate 2, and the pin 22 is movably received in the second divided body 32. Since the connecting portion 32b is provided, the connecting portion between the swash plate 2 and the operating plunger 3 has a simpler structure than the conventional one and can be easily machined. By forming the spherical surface 31b on the joint surfaces of the divided bodies 31 and 32, even if there is a slight misalignment between the axes between the divided bodies 31 and 32, the divided bodies 31 and 32 can be brought into point contact with each other via the spherical surface 31b. , 32 are moved reliably, and the swash plate 2 can be operated reliably by the operating plunger 3.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the operating plunger which is the main part of the axial piston machine according to the present invention, Fig. 2 is a sectional view of the same axial piston machine, and Fig. 3 is a sectional view showing the constant horsepower control valve. , FIG. 4 is a drawing showing a conventional example. 2... Swash plate, 21... Connection arm, 22... Connection pin, 3... Operation plunger,
31...first divided body, 31b...spherical surface, 32...
Second divided body, 32b...connection part.

Claims (1)

[Scope of utility model registration request] An axial piston machine comprising a swath plate 2 whose inclination angle is adjustable and an operating plunger 3 for adjusting the inclination angle of the swash plate 2, wherein the operating plunger 3 is divided into a first One of the joint surfaces of the divided body 31 and the second divided body 32 joined to the first divided body 31 is made into a spherical surface, and a connecting pin 22 is provided on the connecting arm 21 extending from the swash plate 2, and the second divided body 32 is connected to the first divided body 31. An axial piston machine characterized in that the divided body 32 is provided with a connecting portion 32b that freely receives the pin 22.