KR20130055871A - Swash plate type piston pump having flow path pocket - Google Patents

Abstract

The present invention discloses a swash plate piston pump having a flow path pocket so that the lubrication action at the contact surface between the swash plate and the swash plate support is further improved by forming a flow path pocket having a structure capable of expanding the lubrication area on the swash plate and / or the swash plate support.
The present invention provides a swash plate for reciprocating a plurality of pistons provided in a cylinder block rotating together with a rotating shaft, and a swash plate type piston pump including a swash plate support for supporting the swash plate while contacting the swash plate. The first euro pocket in the longitudinal direction and a plurality of second euro pockets are formed at intervals along the length of the first euro pocket.

Description

Swash plate type piston pump having euro pocket {Swash Plate Type Piston Pump having Flow Path Pocket}

The present invention relates to a swash plate piston pump having a flow path pocket, and more particularly, to form a flow path pocket having a structure capable of expanding the lubrication area on the swash plate and / or the swash plate support, so that the lubrication action upon contact between the swash plate and the swash plate support can be achieved. It is to improve even more.

In general, in a swash plate piston pump, a cylinder block fixed to a rotating shaft is provided in a casing, and the front end portions of a plurality of pistons substantially parallel to the rotating shaft are inserted into the cylinder block.

The rear end of the piston is guided to the front surface of the swash plate inclined with respect to the rotating shaft, and the piston is reciprocated with the rotation of the cylinder block, and the hydraulic oil is sucked in / out.

An arc-shaped convex portion is formed on the back of the swash plate, and the convex portion is supported by an arc-shaped concave portion of the swash plate supporter. By lubricating oil on the support surface of the swash plate support and tilting the swash plate relative to the rotation axis, the stroke of the piston changes, and the discharge amount of the hydraulic oil can be adjusted. At this time, when the inclination movement angle of the swash plate is increased, the stroke of the piston is increased to increase the discharge amount, while when the inclination movement angle is reduced, the stroke of the piston is reduced to reduce the discharge amount.

In such a swash plate type piston pump, when the piston is retracted into the cylinder block to discharge the hydraulic oil, the reaction force applied by the hydraulic oil to each piston acts on the swash plate, so that the surface pressure between the swash plate and the swash plate support becomes abnormally high. .

As a result, the lubricating oil film on the interface between the swash plate and the swash plate support is likely to break, and therefore, the frictional surfaces of the swash plate and the swash plate support are required to have abrasion resistance and wear resistance.

Therefore, conventionally, by performing surface hardening treatment such as gas soft nitriding treatment on a swash plate support made of cast iron, the sinter resistance and resistance to the swash plate support are

Abrasion is given.

In addition, for a relatively large pump, copper alloy lining is applied to the support surface of the swash plate support, which may provide the hardening resistance and the wear resistance.

As an example of such a swash plate piston pump, there is one disclosed in Republic of Korea Patent Publication No. 10-2009-42944 (hereinafter referred to as "prior art document").

Referring to the drawings, FIG. 1 is a cross-sectional view of a swash plate piston pump motor 1 according to an embodiment of the present invention. As shown in FIG. 1, the swash plate piston pump motor 1 closes the casing 2 in which the swash plate support 20 is integrally formed and the opening on the right side of the casing 2 to discharge the discharge path 3a and The valve cover 3 which has a suction path (not shown) is provided.

In the casing 2, the rotating shaft 5 which is rotatably supported by the shaft 6 and 7 with respect to the casing 2 and the valve cover 3 is installed in the front-back direction (left-right direction in FIG. 1). The pressing member 8 is fixed to the outside of the bearing 7 provided in the insertion hole 2c of the casing 2 from which the rotating shaft 5 protrudes.

The cylinder block 9 is splined to the rotary shaft 5, and the cylinder block 9 is configured to rotate integrally with the rotary shaft 5. The cylinder block 9 is formed with a plurality of piston seals 9a concave at regular intervals in the circumferential direction about the rotation axis 50 of the rotation shaft 5. Each piston chamber 9a is substantially parallel to the rotation axis 50, respectively, and the front end of the reciprocating piston 10 is accommodated in each piston chamber 9a, respectively. The rear end 10a of each piston 10 which protrudes from the piston seal 9a is spherical, and can rotate to the spherical bearing part 13a of the shoe 13, respectively. Is fitted.

In addition, in the piston pump, the rotational power transmitted to the rotating shaft is input, and the hydraulic oil discharged by the piston is output, while in the piston motor, the inflow of pressurized oil is input and the rotating power of the rotating shaft is output. . That is, since both of them differ only in the method of use, and the basic configuration is the same, the prior art document refers to the configuration as a piston pump motor.

2 is a rear view of the swash plate 12, wherein the rear convex portion 32 of the swash plate 120 is an arc-shaped flat and slippery friction surface 32a opposite to the support surface 22a of the swash plate support 20. And an oil film holding groove 33 extending in the slide direction at the center of the friction surface 32a in the width direction.

However, since the oil film holding groove 33 on the back of the swash plate 12 disclosed in the prior art document is formed long only in the slide direction, the lubrication area is small, so that the lubrication action is smoothly performed when actually contacting the swash plate support 20. There is a problem that cannot be supported.

Republic of Korea Patent Publication No. 10-2009-42944 (published: 2009.5.4)

Accordingly, the present invention has been made to solve the conventional problems as described above, the object of the present invention is to form a lubrication action by forming an extended euro pocket on the contact surface of the swash plate or the swash plate support.

Solution to Problem The present invention for achieving the above object is a swash plate which is provided with a plurality of pistons provided in the cylinder block rotating together with the rotating shaft to reciprocate, and a swash plate support that supports the swash plate while in contact with the swash plate In the piston pump,

The rear convex portion of the swash plate is formed with a first euro pocket in the longitudinal direction and a plurality of second euro pockets at intervals along the length of the first euro pocket.

Further, the contact surface of the swash plate support has a structure in which a first euro pocket in the longitudinal direction and a plurality of second euro pockets are formed at intervals along the length of the first euro pocket.

Thus, in the swash plate-type piston pump, the present invention has an effect that the lubrication action can be made more smoothly by forming a flow path pocket on the swash plate or the swash plate support to enlarge the lubrication area.

1 is a cross-sectional view of a conventional swash plate piston pump motor.
It is a rear view of the swash plate of the swash plate piston pump motor shown in FIG.
3 is a cross-sectional view taken along the line VV of FIG. 2.
4 is a rear view of the swash plate according to the present invention.
5 is a longitudinal cross-sectional view of a swash plate according to the present invention.
6 is a front view of the swash plate support according to the present invention.
7 is a longitudinal sectional view of the swash plate support according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a rear view of the swash plate according to the present invention, Figure 5 is a longitudinal sectional view of the swash plate according to the present invention.

As shown in the figure, looking at the rear surface of the swash plate 100 of the swash plate piston pump according to the present invention, each of the swash plate 100 has a longitudinal groove structure in each of the convex portion 110 formed in an arc shape The first euro pocket 111 and a plurality of second euro pockets 112 are formed in the transverse direction over the length of the first euro pocket 111.

The swash plate 100 serves to reciprocate the piston in the cylinder block to be coupled to the rotating shaft.

A through hole 120 through which a drive shaft penetrates is formed at the center of the swash plate 100.

6 and 7, the inner contact surface 210 of the swash plate support 200 is also spaced over the length of the first euro pocket 211 and the first euro pocket 211 in the longitudinal direction. It has a structure in which a plurality of second euro pocket 212 is formed.

6 and 7, an oil inlet hole 213 is formed at an upper end of the first euro pocket 211, and a through hole 220 through which a drive shaft penetrates is formed at the center thereof.

In addition, the second euro pocket 112 and 212 may be formed in various shapes other than the oval shown in the drawing.

Accordingly, the first and second euro pockets 111, 112, 211, and 212 are formed in the swash plate 100 or the swash plate support 200 of the swash plate piston pump according to the present invention, so that the lubrication area is enlarged. Therefore, lubrication may be improved when the swash plate 100 and the swash plate support 200 come into contact with each other.

In other words, the first euro pockets 111 and 211 are formed in the slide direction, and the plurality of second euro pockets 112 and 212 are formed over the entire length direction of the first euro pockets 111 and 211. By being formed at intervals in the horizontal direction, when the flow path area of the lubricating oil is expanded and the swash plate 100 and the swash plate support 200 have a movement due to contact with each other, more reliable lubrication can be achieved.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. It will be possible. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: swash plate
110: convex portion
111: First Euro Pocket
112: second euro pocket
120: through hole
200: swash plate support
210: contact surface
211: first europocket
212: second euro pocket
213: oil inlet
220: through hole

Claims (2)

In the swash plate type piston pump consisting of a swash plate for causing a plurality of pistons reciprocated in the cylinder block rotating together with the rotating shaft, and a swash plate support for supporting the swash plate in contact with the swash plate,
A swash plate piston having a europocket in the rear convex portion of the swash plate is formed with a first europocket in the longitudinal direction and a plurality of second europockets in the transverse direction at intervals along the length of the first europocket. Pump.
The method according to claim 1,
A swash plate type piston pump having a flow path pocket, characterized in that a first euro pocket in the longitudinal direction and a plurality of second euro pockets are formed in the transverse direction at intervals along the length of the first euro pocket on the contact surface of the swash plate support. .

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