KR20000006054U - High efficiency vane pumps with power steering - Google Patents

Abstract

The present invention relates to a vane-type oil pump for supplying hydraulic pressure as a power source of a power steering device, comprising a pump housing, a cam ring coaxially installed in the pump housing and having a cam hole at the center thereof, and sliding with the cam hole on the outer circumferential surface of the rotor. The vane is installed radially and roaming and is installed in the cam hole interlocked with the pump shaft, the pressure plate is installed to press the cam ring and one side wall of the rotor, the thrust plate is located on the other side wall is installed In the vane-type pump comprising a, characterized in that the concave inlet portion which is not in contact with the pressure plate and the thrust plate is formed on both side wall surfaces of the rotor, according to the present invention with the plate in contact with both sides during the rotation of the rotor Not only can it reduce friction, So we can expect action.

Description

High efficency vane type pump for power steering

The present invention relates to a vane type pump for supplying hydraulic pressure as a power source of power steering, and more particularly, a plurality of grooves are provided on a side wall of a rotor installed with vanes and rotating in a cam ring. Or vane-type pump of the power steering device to reduce the friction with the plate contacted from both sides when the rotor rotates, as well as to obtain a lubricating effect through the oil distribution through the grooves or holes by forming a hole or a hole. .

In general, the hydraulic power steering device increases hydraulic power from the oil pump installed in the middle of the steering linkage connected to the steering wheel by the power steering gear and applies the steering wheel (front wheel) through the output shaft to increase steering power, thereby reducing the driver's power. It also enables light and quick steering even by force.

This power steering device is composed of a power means for generating hydraulic pressure, an operating means for generating a steering force by converting the generated hydraulic pressure into a mechanical force, and a control means for controlling the operation direction and state of the working cylinder through opening and closing of the flow path. In addition, the steering wheel ratio by the driver is reduced so that the steering gear ratio can be freely selected, and the kickback phenomenon that the shock is transmitted to the steering wheel through the front wheel from the road surface is prevented, and the simimmotion by the vibration of the front wheel is possible. It has the characteristic of attenuating (shimmy motion).

In the power steering system, the power means is composed of a steering pump that generates hydraulic pressure by compressing oil while rotating by receiving the power of the engine. The steering pump includes a vane type pump, a rotary pump, a sleeper pump, and the like. Vane type pumps are most commonly used.

Here, the vane-type pump of the power steering device is located on the pump housing 110 in which the pump shaft 112 receives the rotational force of the engine as shown in FIG. 1, and the inner coaxial of the pump housing 110. And a cam ring 120 that forms a cam hole 121 in a central portion thereof, and a vane 135 that slides radially on the outer circumferential surface thereof and slides with the cam hole 121, and is inserted into the cam hole 121 of the cam ring 120. A rotor 130 installed in cooperation with the 112, a pressure plate 140 for pressing the one side walls of the cam ring 120 and the rotor 130 through the pressure plate spring 145, and the pressure plate Located on the other side of the 140 is composed of a thrust plate (150; thrust plate) for closing the interior of the pump housing (110).

Accordingly, when the rotational power of the engine is transmitted to the pump shaft 112 and the rotor 130 rotates, the space between the cylindrical surface of the pump housing 110 and the rotor 130 and the vane 135 is filled with oil. The vane 135 of the rotating rotor 130 is slid along the cam hole 121 of the cam ring 120 to suck oil from the suction port and discharge the oil toward the discharge port.

However, in the vane-type pump of the conventional power steering device, when the discharge oil pressure is high, the side friction of the pressure plate 140, the rotor 130, and the thrust plate 150 is increased by hydraulic pressure, thereby increasing the friction. Due to the wear of the side contact portion of the rotor due to the excessive leakage of the internal (internal leakage) of the pumping oil has a problem that reduces the pumping efficiency.

In addition, the oil pressure acts on the rotor 130 in an unbalanced state so that the rotor 130 is biased toward the thrust plate 150, thereby causing wear of the contact portion of the thrust plate 150 to be accelerated, thereby lowering the durability of the pump. There is a problem.

Therefore, the present invention has been devised in view of the above problems, and it is possible to reduce the friction with the plate in contact with both sides during the rotation of the rotor, as well as the power steering device to expect the lubrication action through the oil distribution. The purpose is to provide a vane type pump.

1 is an exploded perspective view showing a vane type pump of a conventional power steering device

Figure 2 is an exploded perspective view showing a vane-type pump of the power steering device according to an embodiment of the present invention

3A is a front view showing the rotor of the vane pump shown in FIG.

3B is a cross-sectional view taken along the line A-A of FIG. 3A

Figure 4a is a front view showing the rotor of the vane-type pump according to another embodiment of the present invention

4B is a cross-sectional view taken along the line B-B in FIG. 4A

Explanation of symbols on the main parts of the drawings

20: cam ring 21: cam hole

30, 60: rotor 33: hole

40: pressure plate 50: thrust plate

63: home

The present invention for achieving the above object is installed in the pump housing, the coaxially installed in the pump housing, the cam ring having a cam hole in the center, and the vane sliding with the cam hole on the outer circumferential surface is radially mounted and embedded in the cam hole A vane-type pump comprising a rotor installed in cooperation with a pump shaft, a pressure plate installed to press the cam ring and one side wall of the rotor, and a thrust plate positioned at the other side wall on which the pressure plate is installed. It is an object of the present invention to provide a vane-type pump having recesses that are not in contact with the pressure plate and the thrust plate on both side walls thereof.

On the other hand, the concave portion is made of a plurality of holes formed through the axial direction, or consists of a plurality of grooves, the holes and grooves are formed by the process after the rotor forming, or is formed together with the sintering molding of the rotor have.

Hereinafter, an embodiment of the present invention will be described in more detail based on the accompanying drawings.

2 illustrates a vane-type pump of a power steering apparatus according to an embodiment of the present invention, a pump housing 10 in which a pump shaft 12 receives a rotational force of an engine is installed, and the pump housing 10. The cam hole 20 of the cam ring 20 has a cam ring 20 positioned on the inner coaxial of the cam ring 20 to form a cam hole 21 at the center thereof, and a vane 35 which is radially mounted on the outer circumferential surface thereof and slid with the cam hole 21. 21) The rotor 30 is internally installed and interlocked with the pump shaft, the pressure plate 40 for pressing the cam ring 20 and one side wall of the rotor 30 through the pressure plate spring 45, and the pressure plate. The basic structure of the thrust plate 50 and the like, which is located at the other side of the 40 and closes the inside of the pump housing 10, is the same as that of a conventional vane type pump.

As shown in FIGS. 3A and 3B, a plurality of holes 33 are formed in the axial direction through the slots 31 in which the vanes 35 are installed, as shown in FIGS. 3A and 3B. The hole 33 at this time is not in contact with the pressure plate 40 and the thrust plate 50.

In addition, the hole 33 is formed in a circular shape, and the side wall surface of the rotor 30 is evenly spaced from the central shaft hole 32 so as to maintain a uniform sliding force with the pressure plate 40 and the thrust plate 50. Are arranged.

The hole 33 may be formed by cutting through a drilling machine after forming the rotor 30 or may be simultaneously formed using a cylindrical core or the like during sintering of the rotor 30. Can be.

Referring to the operation of the vane-type pump according to an embodiment of the present invention is configured as follows.

First, the rotational power of the engine is transmitted to the pump shaft 12 so that the rotor 30 rotates like the pump shaft, and the vanes 35 of the rotor 30 thus rotating are cam holes 21 of the cam ring 20. In the process of sucking the oil from the suction port side while discharging along the discharge port, the holes 33 formed on both side walls of the rotor 30 are formed on both side walls of the rotor 30, the pressure plate 40, and the thrust plate 50. Since the contact surface, i.e., the frictional surface, is reduced, the frictional force between the pressure plate 40 and the thrust plate 50 due to the rotation of the rotor 30 can be reduced.

In addition, the oil is introduced into the hole 33 during the pumping of the oil according to the rotation of the rotor 30, and thus the oil is introduced into the side wall of the rotor 30, the pressure plate 40, and the thrust plate ( Since the lubrication action is introduced between the 50) it is possible to reduce the friction between the rotor 30 and the pressure plate 40 and the thrust plate 50.

4A and 4B show the rotor 60 of the vane type pump according to another embodiment of the present invention, which in one embodiment is different from the rotor 30 having an axially penetrated hole 33 It has a structure in which the groove 63 is formed, the other configuration, forming method and action is the same as the rotor 30 in one embodiment.

As described above, the present invention can form a plurality of grooves or holes in the side wall of the rotor to reduce the friction area with each plate contacted at both sides during the rotation of the rotor, and at the same time, as a lubrication through the distribution of oil The frictional force of both sides of the rotor can be reduced, and the imbalance of the pressing force generated on both sides of the rotor can be reduced, thereby minimizing frictional wear of the friction surface with the rotor at low and high pressure discharge pressures, thereby improving the durability of the pump. Will be.

In addition, the present invention can achieve a noise reduction effect as both friction surfaces of the rotor are reduced, reducing the gap between the cam ring and the rotor due to abrasion of the friction portion to suppress the reduction of pumping efficiency due to oil leakage. Will be.

Although the present invention has been shown and described with respect to particular embodiments, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the accompanying Utility Model Claims. Anyone who owns it can easily find out.

Claims (4)

A pump housing 10, a cam ring 20 installed coaxially in the pump housing 10 and having a cam hole 21 at a central portion thereof, and a vane 35 sliding with the cam hole 21 at an outer circumferential surface thereof is radially disposed. Rotors 30 and 60 that are installed to be roaming and interlocked in the cam hole 21 and interlocked with the pump shaft 12 and pressure plates installed to press the one side walls of the cam ring 20 and the rotor 30 ( In the vane-type pump comprising a 40, and a thrust plate 50 located on the other side wall on which the pressure plate 40 is installed, Vane-type pump, characterized in that the recessed portion which is not in contact with the pressure plate (40) and the thrust plate (50) is formed on both side walls of the rotor (30) (60). The vane pump according to claim 1, wherein the concave inlet comprises a plurality of holes (33) penetrated in the axial direction. The vane pump according to claim 1, wherein the concave inlet comprises a plurality of grooves (63). The vane-type pump according to claim 1, wherein the concave inlet is formed by processing after the rotor (30) (60) is formed or together with the rotor (30) (60).