JPH0421018Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an axial piston type fluid machine.

[Conventional technology]

Conventionally, there is an axial piston type fluid machine (fluid pump/motor) used as a pump or motor, as shown in Figure 2. A cylinder block 10 having a plurality of cylinders 11 is attached to a rotating shaft 40 by known means such as splines 15, 41 or keys, and an axial piston 12 is slidably fitted into each cylinder 11. . In addition, each cylinder 11
A cylinder port 13 communicating with the valve plate 20 opens into an end face 14 of the cylinder block 10.
It faces the end surface 24 of.

The cylinder block 10, the valve plate 20, and the rotating shaft 40 are built into the casing 30, and the rotating shaft 40 is rotatably supported by the casing 30 via a bearing 50.
is provided with an inlet 31 and an outlet 32.

By the way, FIG. 3 is a front view of the cylinder block 10 looking toward the cylinder port 13, and FIG. 4 is a plan view of the valve plate 20. As can be seen, the valve plate 20 has a high-pressure port 21 and a low-pressure port 22 open to high-pressure fluid and low-pressure fluid, respectively, opposite the cylinder port 13; A passage or notch 23 is provided at the position where the cylinder 11 moves to the lower pressure side to allow the high pressure fluid in the cylinder 11 to escape to the lower pressure side.

By the way, in general, the surface 24 of the valve plate 20 that slides on the cylinder block 10 needs to be made of a material with good lubricity in order to prevent seizure and the like, and the valve plate body also has a high pressure port 21 and a low pressure port 21. Port 22 opens,
In particular, the opening of the high-pressure port 21 is subjected to the force of the high-pressure fluid, which forces the high-pressure port 21 to expand, so the valve plate as a whole needs to have sufficiently high strength.

Therefore, as the valve plate 20 of the axial piston type fluid machine, for example, the valve plate 20 shown in FIG.
As shown in c, the member 20a made of a material with good lubricity (good lubricant) is placed on the surface of the end face 24 of the valve plate 20 (the end face that slides opposite the end face 14 of the cylinder block 10). This member 20a may be bonded to a member 20b made of a strong material (high-strength material), or the entire valve plate 20 may be made of a member 20c made of a good lubricant as shown in FIGS. 6a and 6b. is proposed.

[Problem that the invention attempts to solve]

However, in the valve plate shown in FIGS. 5a to 5c, the bearing material must be bonded to the surface of a strong material, which increases the cost. In addition, if the member 20a is poorly bonded, There is a possibility that this sliding surface bearing material 20a may peel off from the base material 20b, impairing the function of the axial piston type fluid machine.

Also, as shown in Figure 6a and b, if the entire valve plate is made of a material with good lubricity,
Since the strength is weakened, it is necessary to keep the usable fluid pressure low, which prevents the machine from fully demonstrating its capabilities.

The present invention aims to solve these problems by providing an axial piston type fluid machine in which the valve plate has good bearing properties and sufficient strength. With the goal.

[Means for solving problems]

Therefore, the axial piston type fluid machine of the present invention has a cylinder block attached to a rotating shaft, and a cylinder block mounted on the rotating shaft so as to be parallel to the rotating shaft on the same circumference centered on the rotating shaft. A valve plate having a plurality of cylinders with built-in axial pistons, a plurality of cylinder ports that are opened at the end face of the cylinder block and communicate with the cylinders, and a half-moon-shaped port that can be sequentially aligned with these cylinder ports. and a casing that supports the valve plate and rotatably supports the rotating shaft, wherein the valve plate includes a first ring member made of a good lubricant and having the port. and a second ring member made of high-strength material that holds the first ring member from the inside and outside, respectively.
It is characterized by comprising a ring member and a third ring member.

[Effect]

In the above-mentioned axial piston type fluid machine of the present invention, when the rotating shaft rotates, the cylinder block also rotates, and the piston inside the cylinder reciprocates, thereby operating through the cylinder port communicating with the cylinder and the port with the valve plate. Oil is supplied and discharged. At this time, the valve plate has a first port with a port that is in sliding contact with the end surface of the cylinder block.
Since the ring member is made of a good lubricant, it will not cause problems such as seizure, and the second and third ring members, which sandwich the inside and outside of the first ring member, are made of high-strength material. , can sufficiently withstand high-pressure fluid acting on the port.

〔Example〕

Hereinafter, an axial piston type fluid machine as an embodiment of the present invention will be explained with reference to the drawings. Figures 1a to 1c show its valve plates, Figure 1a is its plan view, and Figure 1b is a cross-sectional view taken along the line bb in Fig. 1a, and Fig. 1c is a sectional view taken along the line bb in Fig. 1a.
It is a sectional view taken along the line c-c of FIG.
Inside, the same reference numerals as in FIGS. 2 to 6 indicate substantially the same parts.

As shown in FIG. 2, the axial piston type fluid machine according to this embodiment also has a cylinder block 10 attached to a rotating shaft 40 and a cylinder block 10 attached to the rotating shaft 40 on the same circumference centered on the rotating shaft 40. A plurality of cylinders 11 with built-in axial pistons 2 are bored in the cylinder block 10 so as to be parallel to each other, and an end surface 14 of the cylinder block 10.
A valve plate 1 has a plurality of cylinder ports 13 that are open to each other and communicate with the cylinders 11, and a half-moon-shaped high pressure port 21 and a low pressure port 22 that can be sequentially aligned with these cylinder ports 13.
and a casing 30 that supports the valve plate 1 and rotatably supports the rotating shaft 40.

The valve plate 1 has a surface 5 in contact with the cylinder block 10, as shown in FIGS.
The high-pressure port 21 and low-pressure port 22 are made of a good lubricant material (a material with good bearing properties, such as a copper alloy,
A center ring 1a as a first ring member made of white metal, aluminum-tin alloy) and an inner ring 1b as a second ring member made of a high-strength material (e.g. steel material) that sandwiches this center ring 1a from the inside and outside, respectively. and an outer ring 1c as a third ring member made of high-strength material.

Note that the center ring 1a and the inner ring 1b and the center ring 1a and the outer ring 1c are press-fitted, shrink-fitted,
The three members, the central ring 1a, the inner ring 1b, and the outer ring 1c, are fixed together by means of oil springs, screws, adhesive bonding, welding, or the like.

With the valve plate 1 constructed in this manner, the center ring 1a is made of a commonly available material with good lubricity, and the inner ring 1b and outer ring 1c are made of a commonly available high strength material. By assembling 1a to 1b together, the surface 5 in contact with the cylinder block 10 is
can be made of a material with good lubricity, and the force of the high-pressure fluid applied to the high-pressure port 21 is absorbed by the inner ring 1b and the outer ring 1 made of strong materials.
You can accept it with c.

The shape of the surface 5 of the valve plate 1 in contact with the cylinder block 10 may be a flat surface, a spherical surface, or another curved surface.

[Effect of idea]

As detailed above, according to the axial piston type fluid machine of the present invention, the cylinder block attached to the rotating shaft is parallel to the rotating shaft on the same circumference centered on the rotating shaft. A plurality of cylinders with built-in axial pistons are formed in the cylinder block, a plurality of cylinder ports are opened in the end face of the cylinder block and communicate with the cylinders, and a half-moon shape that can be sequentially aligned with these cylinder ports is provided. An axial piston type fluid machine comprising: a valve plate having a port; and a casing that supports the valve plate and rotatably supports the rotary shaft; The valve plate is composed of a first ring member made of aluminum, and a second ring member and a third ring member made of a high-strength material that sandwich the first ring member from the inside and outside, respectively, so that the valve plate has good bearing performance. However, it has the advantage that it can have sufficient strength and can also contribute to lower costs.

[Brief explanation of drawings]

Figures 1a to 1c show a valve plate constituting an axial piston type fluid machine as an embodiment of the present invention, and Figure 1a is a plan view thereof;
Figure b is a sectional view taken along line bb in Figure 1a, Figure 1c is a sectional view taken along line CC in Figure 1a, and Figures 2 to 6 show a conventional axial piston type fluid machine. Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is an end view of its cylinder block, Fig. 4 is a plan view of its valve plate, and Figs. 5 a to c show its valve plate. FIG. 5a is a plan view thereof, FIG. 5b is a sectional view taken along line bb in FIG. 5a, and FIG. 5c is a sectional view taken along line c-c in FIG. 5a. 6a and 6b show other examples of the valve plate, FIG. 6a is a plan view thereof, and FIG. 6b is a sectional view taken along the line bb in FIG. 6a. DESCRIPTION OF SYMBOLS 1...Valve plate, 1a...Central ring as a first ring member, 1b...Inner ring as a second ring member, 1c...Outer ring as a third ring member, 5...Cylinder block in the valve plate surface in contact with, 10... cylinder block, 11... cylinder, 12... piston,
13... Cylinder port, 14... Cylinder block end face, 15... Spline, 21... High pressure port, 22... Low pressure port, 23... Notch, 3
0... Casing, 31... Suction port, 32... Discharge port, 40... Rotating shaft, 41... Spline.

Claims (1)

[Scope of utility model registration request] a cylinder block mounted on a rotating shaft; a cylinder with built-in axial pistons drilled in plural numbers in the cylinder block so as to be parallel to the rotating shaft on the same circumference centered on the rotating shaft; A valve plate having a plurality of cylinder ports that open at the end face of the cylinder block and communicate with the cylinders, a half-moon-shaped port that can be sequentially aligned with the cylinder ports, and a valve plate that supports the valve plate and rotates the rotation shaft. In an axial piston type fluid machine comprising a casing that freely supports the valve plate, the valve plate includes a first ring member made of a good lubricant having the port, and a height plate that sandwiches the first ring member from the inside and outside, respectively. An axial piston type fluid machine comprising a second ring member and a third ring member made of a strong material.