KR20230093642A - Swash plate type hydraulic motor apparatus system - Google Patents

Abstract

The present invention relates to a swash plate type hydraulic motor, and it is possible to reduce friction and noise of a cylinder block rotating together with a rotating shaft by forming a J shape by placing a bulkhead in the O-ring groove of the rotating shaft to prevent wear and flow of the O-ring, and to reduce friction and noise of the cylinder block rotating together with the rotating shaft. By minimizing the contact surface of the shoe and providing an oil storage space, it is possible to prevent the sticking of the shoe and the piston shoe and smooth the oil supply, thereby preventing friction and extending the life of the device.

Description

Swash plate hydraulic motor system {SWASH PLATE TYPE HYDRAULIC MOTOR APPARATUS SYSTEM}

The present invention prevents oil leakage and damage to the rotating shaft due to carbon through structural improvement of the O-ring insertion groove of the rotating shaft, and can reduce frictional force and heat generation due to line contact by expanding the contact area between the cylinder shoe and the shoe, and push It is a technical field related to a swash plate type hydraulic motor system that can prevent a collision with an inclined plate in advance by forming the bending structure of the plate into a round shape.

In general, a piston pump is a method of sucking and discharging a fluid by using a volume change due to a reciprocating motion of a piston. am.

In general, a swash plate type piston pump consists of a rotating shaft, a swash plate, a cylinder, a cylinder block, a piston, and a shoe. When the rotating shaft and the cylinder block rotate together, the cylinder block adheres to the sliding surface of the valve plate and relatively rotates, and the fluid moves through the cylinder. When the opening of the cylinder formed on the rear surface of the block is connected to the suction port of the valve plate, it is sucked into the cylinder, and when the opening of the cylinder is connected to the discharge port of the valve plate, it is discharged to the outside of the cylinder.

On the other hand, as described above, according to the pumping action of the piston, a pressure fluctuation phenomenon occurs in the cylinder of the cylinder block as the pressure rising process and the pressure falling process are repeated. And noise increases, and this pressure fluctuation acts as a vibrating force, vibrating the entire device and causing noise.

In particular, pressure fluctuations caused by the rotation of the cylinder block connected to the rotating shaft together with the rotating shaft cause eccentricity of the rotating shaft and the bearing over time, and interfere with the packing of the O-ring placed in the gap of the rotating shaft, resulting in oil leakage and carbon generation. There is a problem that causes a failure of the device.

Furthermore, these pressure fluctuations cause surface contact between the piston shoe and the shoe into which the piston shoe is inserted, and increase the frictional force due to the jamming caused by sticking, so that the oil provided during the sliding motion of the swash plate and slippers is not smoothly provided to the slippers. However, there is a problem of generating pulsation or further causing vibration and noise.

The present invention has been devised to solve the above problems, and an object according to one aspect of the present invention is to improve the structure of the O-ring groove and shoe of the rotating shaft to reduce vibration and noise caused by pressure fluctuation of the swash plate type hydraulic motor To provide a swash plate type hydraulic motor system.

The swash plate hydraulic motor according to an embodiment of the present invention includes a casing 10, a rotating shaft 100, a swash plate 30, a cylinder block 40, a piston, a shoe 200, and a shoe plate 210. In the type hydraulic motor, the rotating shaft 100, a plurality of grooves 110 and an O-ring 120 inserted into the grooves 110 are disposed at one end of the rotating shaft 100, the first groove 111 is c shape, the second groove portion 112 has a J-shaped structure in which the end point is biased at the start point and the side wall of the end point is higher than the start point, and the shoe 200 has a structure in which the inner diameter accommodates the piston shoe 51 , The outer diameter increases obliquely starting from the point where the radius of the piston shoe 51 is inserted into the shoe 200, but decreases from the floor 211 to the chamfered end point 212, and the push plate is a piston shoe inserted It is characterized in that the second through hole into which the rotating shaft is inserted is bent and extended in the circumference where the first through hole is disposed, and the bent portion has a round shape.

According to one aspect of the present invention, the present invention configures the structure of the groove portion into which the O-ring of the rotating shaft is inserted into a J-structure to prevent shaking and abrasion of the O-ring due to pressure fluctuations in the motor, and the shoe and the piston shoe are engaged in swaging coupling. The structure of the shoe is configured so that the shoe and the piston shoe can be coupled in line contact to prevent seizure and friction due to surface contact between the shoe and the piston shoe, and the supplied oil is lubricated by providing a space inside the line contact coupling between the shoe and the piston shoe. It has the advantage of smooth operation of the shoe and the piston shoe.

In addition, collision between the push plate and the swash plate, noise, and machine failure can be prevented in advance by round-bending the connecting portion of the first through hole and the second through hole of the push plate.

1 is a schematic perspective view of a swash plate type hydraulic motor.
2 is a schematic perspective view of a conventional swash plate hydraulic motor rotary shaft 100
3 is a schematic perspective view of a conventional swash plate type hydraulic motor shoe 200.
4 is a schematic cross-sectional view of a swash plate type hydraulic motor rotating shaft 100 according to an embodiment of the present invention.
5 is a schematic cross-sectional view of a swash plate type hydraulic motor shoe 200 according to an embodiment of the present invention.
6 is a front view and a cross-sectional view of a swash plate type hydraulic motor push plate 60 according to an embodiment of the present invention.
It is revealed that the accompanying drawings are illustrated as references for understanding the technical idea of the present invention, and thereby the scope of the present invention is not limited.

Hereinafter, a swash plate type hydraulic motor according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

4 is a schematic cross-sectional view of a swash plate type hydraulic motor rotating shaft 100 according to an embodiment of the present invention, and FIG. 5 is a schematic cross-sectional view of a swash plate type hydraulic motor shoe 200 according to an embodiment of the present invention, 6 is a front view and a cross-sectional view of a swash plate type hydraulic motor push plate 60 according to an embodiment of the present invention.

4, 5 and 6, the swash plate hydraulic motor according to an embodiment of the present invention includes a casing 10, a rotating shaft 100, a swash plate 30, and a cylinder block like a conventional swash plate hydraulic motor. 40, the piston 50, the shoe 200, and the shoe plate 210 may be included, and may be provided in this embodiment, of course, in this embodiment, oil leakage and rotational shaft 100 The description will be focused on the configuration of the rotating shaft 100 preventing wear, the shoe 200 preventing friction and the smooth supply of oil, and the push plate 60.

In general, a swash plate type piston pump is coupled with a rotary shaft 100 rotatably installed through a casing 10 as shown in FIG. 1, an inclined plate 30 installed obliquely inside the casing 10, and the rotary shaft 100 is installed inside the casing 10 so as to be rotatable together, and a plurality of radial cylinders are formed through the cylinder block 40 in the direction of the rotation shaft 100 and each end of the inclined plate via the piston shoe 51 ( 30), a plurality of pistons 50 inserted and installed to be axially reciprocated in each of the cylinders forward of the cylinder block 40 to slide in contact with, and a sliding surface in close contact with the rear surface of the cylinder block 40 and a pair of suction and discharge ports communicating with the openings of each of the cylinders, each comprising a valve plate formed therethrough.

In the present invention, a plurality of grooves 110 and an O-ring 120 inserted into the grooves 110 are disposed on the rotary shaft 100 to facilitate the rotation of the rotary shaft 100 leading the rotation of the cylinder block 40. , The first groove portion 111 may be c-shaped, and the second groove portion 112 may have a J-shaped structure in which the end point is biased at the starting point and the side wall of the end point is higher than the starting point.

Referring to FIG. 4 in detail, in the rotating shaft 100, the O-ring 120 is fitted into the first groove 111 and the second groove 112, and the second groove 112 has a J-shaped structure. can do. Therefore, when the O-ring 120 is placed in the first groove 111 and the second groove 112, the O-ring 120 does not shake left and right when the rotating shaft 100 rotates due to the J-shaped second groove bulkhead. The position is fixed in the 2-groove 112 so that it not only helps to rotate stably by the bearing, but also prevents wear of the O-ring 120 and reduces noise and vibration.

The O-ring 120 is not a custom-made product and corresponds to a batch-produced industrial product. Therefore, it is common to use a smaller or larger size than the groove of the groove 110 because it cannot correspond to all of the grooves 110 of various processed products. In relation to this, in the case of a swash plate type hydraulic motor, vibration inevitably occurs due to rapid pressure fluctuations and pulsation of the motor, which causes eccentricity during rotation of the rotating shaft 100 and the cylinder block 40, resulting in the loss of the bearing and the rotating shaft 100. Friction is caused and the O-ring 120 is worn by repeated movements of moving left and right in the groove, resulting in oil leakage and more severe vibration and noise.

Accordingly, the present invention includes the first groove part 111 and the second groove part 112 into which the O-ring 120 is fitted, but has a J-shaped structure from the start point to the side wall of the end point by placing the start point and end point in the second groove part 112. By configuring the O-ring 120 to be stably seated in the groove 110, it is possible to reduce the phenomenon of the O-ring 120 moving left and right due to vibrations caused by pressure fluctuations when the rotating shaft 100 rotates.

Furthermore, by constructing the side wall of the end point at the starting point higher than the starting point, it is possible to align the center line by providing a reference plane when assembling the finished product, thereby reducing the cumulative tolerance, thereby securing the stability of the structure. When the block 40 rotates, it is possible to reduce severe vibration and noise caused by eccentricity or pressure fluctuation.

On the other hand, the first groove 111 is configured in the same U-shaped structure as in the prior art so that the O-ring 120 moves in the groove 110 and is configured to accommodate a predetermined vibration caused by pressure fluctuation, so that the second groove 112 and It can be configured to complement each other flexibly.

On the other hand, referring to FIG. 3, the shoe 200 has a structure in which the inner diameter accommodates the piston shoe 51, and the outer diameter increases obliquely starting from the point where the radius of the piston shoe 51 is inserted into the shoe 200. It may be a structure that decreases from the floor 211 to the end point 212 before chamfering.

The shoe 200 repeats the process of sucking and discharging oil with the piston shoe 51 inserted, and the motor operates by sliding between the swash plate and the shoe plate 210. At this time, the oil sucked by the piston shoe 51 between the swash plate and the shoe plate 210 serves as a lubricant. However, if the width of the pressure fluctuation increases, a pulsation phenomenon occurs and oil for sliding may not be smoothly supplied. In this case, vibration and noise may occur as well as motor failure.

In relation to this, when the piston shoe 51, which is a structure inserted into the shoe 200, lapses over time, it is bonded to the shoe 200 and is in surface contact and transformed into a jammed structure, and the piston shoe 51 is removed from the shoe 200 by friction. It does not operate smoothly, so oil supply is not smooth. This is one of the causes of oil not being supplied smoothly due to pulsation.

In this regard, the process of coupling the piston shoe 51 to the shoe 200 is a swaging coupling, and the shoe 200 passes through the mold while wrapping the piston shoe 51 and the shape is processed. The shoe 200, which has weak hardness, flexibly surrounds the piston shoe 51. At this time, in the case of the conventional general shoe 200 as shown in FIG. 3, the shoe 200 completely covers the piston shoe 51, and the cylinder operation and the inevitable pressure fluctuation or pulsation phenomenon are repeated, and the shoe is deformed by heating and pressurization. 200) is attached to a part of the piston shoe 51, the surface contact area increases so that the piston shoe 51 cannot operate smoothly in the shoe 200.

Therefore, in order to prevent seizure and surface contact, the present invention starts at the point where the radius of the piston shoe 51 is inserted into the shoe 200, and the outer surface increases in an inclined manner, but decreases from the floor 211 to the chamfered end point 212 It is composed of a structure so that the shoe 200 surrounds the piston shoe 51 in the mold frame, and after the chamfering process (sweaging) is completed, the distal end of the shoe 200 is configured to leave a predetermined space with the piston shoe 51 can do.

Therefore, even if there is a repetitive piston operation, it is possible to maintain line contact rather than surface contact due to seizure, so that the piston shoe 51 can maintain a smooth operation in the shoe 200. Furthermore, in the swaging process, the distal end of the shoe 200 is crimped toward the piston shoe 51, a predetermined space is generated in the middle of the shoe 200, and a small amount of oil can be stored in the space, so that the piston operates. lubricating oil can be provided. Therefore, the oil provided for the sliding of the shoe plate 210 and the inclined plate 30 can be continuously supplied, and even when the pulsation phenomenon appears, the oil stored between the shoe 200 and the piston shoe 51 is supplied to maintain the sliding can do.

On the other hand, in the push plate 60, the second through hole 62 into which the rotary shaft 100 is inserted is bent and extended in the circumference where the first through hole 61 into which the piston shoe 51 is inserted is disposed, and the bent portion is round. can be a shape. The push plate 60 supports the shoe 200 during the backward operation during the repetitive sliding operation of the piston shoe 51, and the shoe 200 presses the inclined plate 30 with close contact during the forward operation. It is a structure in which the outer diameter of is inserted into the first through hole (61). At this time, the part where the second through hole 62 into which the rotary shaft 100 is inserted is connected to the circumference where the first through hole 61 of the push plate 60 is arranged is configured as a round shape, so that it can occur by continuous sliding operation. It is possible to prevent abrasion due to collision from contact between the connected portion and the inclined plate 30 and reduce noise.

Although the present invention has been described with reference to the embodiments shown in the drawings, it should be noted that this is only exemplary and various modifications and equivalent other embodiments are possible from those skilled in the art to which the technology pertains. will understand Therefore, the true technical scope of protection of the present invention will be defined by the claims below.

1 swash plate type hydraulic motor
2 motor
10 casing
30 inclined plate
40 cylinder block
50 piston
51 Piston shoe
60 push plate
61 first through hole
62 second through hole
100 axis
110 Groove
111 first groove
112 second groove
120 o-ring
200 shoe
210 shoe plate
211 maru
212 endpoint

Claims (1)

In the swash plate hydraulic motor including the casing 10, the rotating shaft 100, the swash plate 30, the cylinder block 40, the piston, the shoe 200, the push plate and the shoe plate 210,
The rotating shaft 100,
At one end of the rotating shaft 100, a plurality of grooves 110 and an O-ring 120 inserted into the grooves 110 are disposed, the first groove 111 is c-shaped, and the second groove 112 is the end point at the starting point is deflected, and the side wall at the end point is a J-shaped structure higher than the start point,
The shoe 200 has a structure in which the inner diameter accommodates the piston shoe 51, and the outer diameter increases obliquely starting from the point where the radius of the piston shoe 51 is inserted into the shoe 200, but is chamfered from the floor 211 It is a structure that decreases to the end point 212
The push plate is a swash plate hydraulic motor system, characterized in that the second through-hole into which the rotating shaft is inserted is bent and extended in the circumference where the first through-hole into which the piston shoe is inserted is disposed, and the bent portion has a round shape.

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