KR101930688B1 - Axial piston pump - Google Patents

Abstract

The present invention relates to an axial piston pump including: a valve block (100); a drive shaft (200) inserted into the valve block (100); a cylinder block (300) integrally rotated with the drive shaft (200) while being spline-coupled to the drive shaft (200), and formed therein with a plurality of piston chambers (310); a swash plate (400) disposed obliquely to a front of the cylinder block (300); a piston (500) coupled to the swash plate (400) and reciprocally inserted into the piston chamber (310); a valve plate (600) installed at a rear of the cylinder block (300); a housing (700) through which the drive shaft (200) passes, into which the swash plate (400) and the cylinder block (300) are accommodated, and to which valve block (100) is coupled; a roller bearing (800) coupled to the housing (700) while surrounding an outer circumferential surface of the drive shaft (200); and a bushing bearing (900) formed therein with a lubricant supply hole (910) coupled to a contact surface abutting on the swash plate (400) in the housing (700) to supply lubricant onto the contact surface, and a lubricating oil passage (920) through which the lubricant transferred in the lubricant supply hole (910) flows.

Description

[0001] The present invention relates to an axial piston pump,

The present invention relates to an axial piston pump capable of preventing breakage of a bearing installed between a valve block and a drive shaft due to friction generated in a valve block and a drive shaft when the drive shaft rotates.

In general, an axial piston pump rotates a cylinder block at a high speed in a state where a plurality of pistons are inserted in a cylinder (piston chamber). At the same time as the cylinder block is rotated at a high speed, And is configured to suck and discharge the working fluid through each port.

In the axial piston pump, a swash plate type having an inclined swash plate installed in a lateral direction in the valve block is used in many cases. The swash plate includes a shoe for connecting the piston to the swash plate by receiving a ball provided in each piston Have.

The structure of the axial piston pump will be described. A drive shaft is provided at the center of the valve block by being supported by a bearing or the like, and a swash plate is installed at an angle to the drive shaft.

The cylinder block is provided with a plurality of piston chambers (cylinders). In each piston chamber, a ball having one end abuts against the swash plate, The joined piston is inserted. And the inner space of each piston chamber can communicate with the suction port and the discharge port of the valve plate through the opening formed in the rear surface of the cylinder block while the cylinder block rotates.

A valve plate having a suction port and a discharge port is fixedly installed at the rear (front) side of the valve block at the rear end of the valve block.

The rear surface of the valve plate is in contact with the corresponding surface (inner surface) of the rear valve block while the valve plate is installed in the valve block. The front surface of the valve plate is in contact with the rear surface of the cylinder block And is a sliding surface that slides.

In the axial piston pump as described above, when the drive shaft rotates about the central axis, the cylinder block built in the valve block is integrally rotated. At the same time, the piston reciprocates between the top dead center and the bottom dead center in the piston chamber When the fluid is sucked into the piston chamber through the suction port of the valve plate or the piston moves from the top dead center to the bottom dead point, the fluid in the piston chamber is pushed and discharged through the discharge port of the valve plate.

That is, when the drive shaft and the cylinder block are integrally rotated, the shoe and the shoe plate, which support the one end of the piston, rotate while sliding on the swash plate, thereby causing the piston to reciprocate back and forth by the inclination of the swash plate.

When the drive shaft and the cylinder block are integrally rotated, the cylinder block rotates relative to the valve plate. The cylinder block slides in contact with the sliding surface of the valve plate in a close contact state, and the fluid is formed on the rear surface of the cylinder block The opening of the piston chamber is sucked into the piston chamber when the opening of the piston chamber is connected to the suction port of the valve plate and is discharged to the outside of the piston chamber when the opening of the piston chamber is connected to the discharge port of the valve plate.

Of course, the fluid suction and discharge at this time are performed as the piston in each piston chamber reciprocates by the swash plate while the piston chamber is connected to the corresponding port.

Korean Patent Registration No. 0665717 discloses a cylinder block comprising a drive shaft inserted longitudinally in the center of a casing, a swash plate transversely inclined in the casing, a cylinder block integrally rotated with the drive shaft in the casing and having a plurality of piston chambers formed therein, A piston connected to the swash plate through an additional ball joint structure and a shoe and reciprocating in each piston chamber when the cylinder block rotates; and a sliding surface having a sliding surface in which the rear surface of the cylinder block is in sliding contact, A swash plate type axial piston pump including a valve plate having a discharge port and a suction port communicable with an opening portion and a cover or valve block with an inner surface in close contact with a rear surface of the valve plate, The front-side blood flow A connecting conduit which is capable of momentarily connecting the opening of the tone chamber to the opening of the piston chamber immediately next to the front piston chamber which is still connected to the opposite port is formed near the bottom dead center and the top dead center of the valve plate A valve plate of a noise reduction type axial piston pump is disclosed.

However, in the related art, there is a problem that the bushing bearing installed between the casing and the swash plate is damaged due to the friction generated between the casing and the swash plate.

Korean Patent No. 0665717 (December 29, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a bushing of the present invention capable of preventing breakage of a bushing bearing installed between a housing and a swash plate due to friction generated between a housing and a swash plate, To provide an oil piston pump.

An axial piston pump according to the present invention includes a valve block (100); A driving shaft 200 inserted into the valve block 100; A cylinder block 300 splined to the drive shaft 200 and integrally rotated with the drive shaft 200 and having a plurality of piston chambers 310; A swash plate 400 disposed obliquely to the front of the cylinder block 300; A piston (500) coupled to the swash plate (400) and reciprocally inserted into the piston chamber (310); A valve plate 600 installed at the rear of the cylinder block 300; A housing 700 through which the drive shaft 200 penetrates, and in which the swash plate 400 and the cylinder block 300 are embedded and is coupled to the valve block 100; A roller bearing 800 that surrounds the outer circumferential surface of the drive shaft 200 and is coupled to the housing 700; A lubricant supply hole 910 which is coupled to a contact surface of the housing 700 abutting against the swash plate 400 and to which lubricant is supplied to a contact surface thereof and a lubricant oil passage 920 through which the lubricant transferred from the lubricant supply hole 910 flows And a bushing bearing 900, respectively.

Further, the lubricant oil passage 920 is formed in a zigzag structure.

In addition, the lubricant oil passage 920 is formed in a structure in which a plurality of inclined lines are connected to each other in a staggered manner.

In addition, the lubricant oil channel 920 is formed in such a structure that a pair of adjacent slant lines are symmetrical on the slant lines.

Accordingly, the axial piston pump according to the present invention is advantageous in that the bushing bearing installed between the housing and the swash plate can be prevented from being damaged due to friction generated between the housing and the swash plate when the swash plate is rotated.

1 is a sectional view showing an axial piston pump according to the present invention;
2 is a perspective view of a first bushing according to the present invention;
3 is a perspective view of a lubricating oil flow of a first bushing according to the present invention;

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

FIG. 1 is a sectional view of an axial piston pump according to the present invention, FIG. 2 is a perspective view showing a first bushing according to the present invention, and FIG. 3 is a perspective view showing a flow of a lubricating oil in a first bushing according to the present invention.

1 and 2, an axial piston pump according to the present invention includes a valve block 100, a drive shaft 200, a cylinder block 300, a swash plate 400, a piston 500, a valve plate 600 and a housing 700, a roller bearing 800, and a bushing bearing 900.

The valve block 100 is a basic body of the present invention, and its interior is hollow.

The drive shaft 200 is inserted into the valve block 100 and is formed in a cylindrical shape and supported by the housing 700.

The cylinder block 300 is splined to the drive shaft 200 and integrally rotated with the drive shaft 200, and a plurality of piston chambers 310 are radially formed.

The swash plate 400 is disposed obliquely in front of the cylinder block 300.

The piston 500 is coupled to the swash plate 400 and inserted into the piston chamber 310 so as to reciprocate. At this time, the piston 500 is formed at one end with a shoe and is coupled to the swash plate 400 in a tilting manner.

The valve plate 600 is installed at the rear of the cylinder block 300 and has a suction port and a discharge port communicating with the opening of the cylinder block 300. At this time, when the drive shaft 200 rotates about the central axis, the cylinder block 300 built in the valve block 100 is integrally rotated, and the piston 500 is rotated in the piston chamber 310 When the piston 500 reciprocates between the top dead center and the bottom dead center and sucks fluid into the piston chamber 310 through the suction port of the valve plate 600 or moves from the top dead center to the bottom dead center, The fluid in the chamber 310 is pushed out and discharged through the discharge port of the valve plate 600.

The housing 700 includes a swash plate 400 and a cylinder block 300 through which the drive shaft 200 passes. The swash plate 400 and the cylinder block 300 are coupled to the valve block 100.

The roller bearing 800 surrounds the outer circumferential surface of the drive shaft 200 and is coupled to the housing 700.

The bushing bearing 900 is formed in a semicircular shape and includes a lubricant supply hole 910 and a lubricant supply hole 910. The lubricant supply hole 910 is coupled to a contact surface of the housing 700 contacting the swash plate 400, And a lubricating oil passage 920 through which the lubricating oil transferred from the lubricating oil passage 920 flows.

The axial piston pump according to the present invention can prevent damage to the bearing installed between the valve block 100 and the drive shaft 200 due to friction generated in the valve block 100 and the drive shaft 200 when the drive shaft 200 rotates, There is an advantage that it can be prevented.

The lubricating oil passage 920 may be formed in a zigzag structure so that lubricating oil may spread more easily on the inner circumferential surface of the first bushing 710 and the outer circumferential surface of the driving shaft 200.

In addition, the lubricant oil channel 920 may be formed in a structure in which a plurality of inclined lines are connected to each other in a staggered manner.

In addition, the lubricant oil channel 920 may be formed in such a structure that a pair of adjacent slant lines are symmetrical with respect to the slant lines. Accordingly, eccentric rotation can be prevented when the first bushing 710 is rotated.

Meanwhile, the housing 700 may be installed on the outer circumferential surface of the cylinder block 300.

The lubricant oil passage 920 of the bushing bearing 700 is formed in a structure corresponding to the lubricant oil passage 920 and is provided with a holder made of a diamond material so that the lubricant oil passage 920 can communicate with the swash plate It is possible to prevent breakage or abrasion due to the impact with the base member 400.

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 invention as defined by the appended claims.

100: Valve block
200: drive shaft
300: Cylinder block
310: piston chamber
400: swash plate
500: piston
600: Valve plate
700: Housing
800: Roller Bearing
900: Bushing bearing
910: Lubricant supply hole
920: Lube oil flow

Claims (4)

A valve block (100);
A driving shaft 200 inserted into the valve block 100;
A cylinder block 300 splined to the drive shaft 200 and integrally rotated with the drive shaft 200 and having a plurality of piston chambers 310;
A swash plate 400 disposed obliquely to the front of the cylinder block 300;
A piston (500) coupled to the swash plate (400) and reciprocally inserted into the piston chamber (310);
A valve plate 600 installed at the rear of the cylinder block 300;
A housing 700 through which the drive shaft 200 penetrates, and in which the swash plate 400 and the cylinder block 300 are embedded and is coupled to the valve block 100;
A roller bearing 800 that surrounds the outer circumferential surface of the drive shaft 200 and is coupled to the housing 700; And
A lubricant supply hole 910 which is coupled to the contact surface contacting the swash plate 400 and to which lubricant is supplied to the contact surface of the housing 700 and a lubricant oil passage 920 through which the lubricant transferred from the lubricant supply hole 910 flows, And a bushing bearing (900)
The lubricant oil passage 920 is formed in a structure in which a plurality of inclined lines are connected to each other in a staggered manner and a pair of adjacent inclined lines are symmetrically formed on the inclined lines,
And a holder formed in a structure corresponding to the lubricant passage (920) and installed in the lubricant passage (920).
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