JPH04129377U - Power steering device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of this invention is to prevent oil leakage inside the control valve by allowing the inner valve that makes up the control valve to rotate smoothly without deformation due to high pressure oil from the oil pump. To provide a power steering device capable of reducing the size of an oil pump by making the steering feel light and responding to higher output of the power steering device. [Structure] The power steering device of the present invention seals the gap δ formed between the inner peripheral surface of the inner valve 12 of the control valve 10 and the outer peripheral surface of the input shaft that fits into this inner valve 12. A seal member 110 is interposed between these two, and a radial hole 12C is provided in the inner valve 12.
It is characterized in that the pressure oil from the oil pump 40 is introduced into the gap by providing a gap.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a power steering device, and more specifically, to a main pump for a power steering device. Regarding the control valve that supplies pressure oil discharged from the pump to the power cylinder. .

0002

[Conventional technology]

The conventional integral type power steering device uses the power formed inside the gear housing. a cylinder, a piston slidably fitted within the power cylinder, and a piston slidably fitted within the power cylinder; It is equipped with a sector gear that meshes with a rack formed in a part of the piston. A control valve is installed in one of the two chambers in the power cylinder, which is divided into two chambers. sector from the input shaft by introducing pressure oil through the piston and reciprocating the piston. It is configured to assist the steering force transmitted to the gear. This control bar FIG. 3 shows the relationship between the lube and the piston.

0003 The control valve 10 is separated by a piston 20, as shown in FIG. The main pump ( High-pressure oil supplied from oil pump) 40 is supplied to one of the chambers, and the other The low pressure oil discharged from the chamber is discharged into a reservoir 50. This con As shown in the figure, the troll valve 10 is formed directly on the inner peripheral surface of the shaft hole of the output shaft 60. The outer valve 11 and the cylindrical inner inserted into the outer valve 11 are - valve 12. This inner valve 12 is connected to the input shaft 70 The input shaft 70 is connected to the input shaft 70 by a pin. It is configured to rotate integrally with 0.

0004 Thus, the outer valve 11 is arranged on the inner peripheral surface of the shaft hole 61 of the output shaft 60 at equal intervals in the circumferential direction. It is composed of six grooves 11A formed at intervals in the axial direction, and the inner The valve 12 has six grooves 12A that correspond to the grooves 11A of the outer valve 11. Configured with the necessary features. In addition, each groove 11A of the outer valve 11 and these grooves Each portion 11B other than 11A has six radial holes 11B and 11C. It is formed one by one. Three of the six holes 11B formed in each groove 11A Every other hole 11B' is connected to one of the chambers 31 and 32 of the power cylinder 30. The remaining three holes 11B'' communicate with the other chamber every other hole. There is. Also, among the six holes 11C, three holes 11C' are filled with oil every other hole. The remaining three holes 11C'' are connected to the pump 40, and the remaining three holes 11C'' are filled with reservoirs every other hole. It is connected to the bar. Therefore, by rotating the input shaft 70 during steering, the oil pump The high pressure oil of the pump 40 is supplied to the chamber 3 of the power cylinder 30 via the control valve 10. In addition to supplying oil to either chamber 1 or 32, it also controls low pressure oil from the other chamber. The liquid is discharged to a reservoir 50 via a valve 10.

[0005] Conventional power steering devices are configured as described above, so the steering wheel cannot be used to operate the steering wheel. The input shaft 70 rotates and is controlled from the hole 11C' of the outer valve 11. When high pressure oil from the oil pump 40 is introduced into the valve 10, this high pressure oil flows through the hole 11. It is supplied to one chamber 31 of the power cylinder 30 through the hole 11B' adjacent to C'. to move the piston 20 to the right in FIG. Along with this movement of the piston 20 When the low pressure oil is discharged from the other chamber 32, this low pressure oil flows into the hole of the outer valve 11. 11B'' into the control valve 10 and adjacent to this hole 11B'' It is discharged into the reservoir 50 through the hole 11C''.

[0006]

[Problem that the idea aims to solve]

However, in the conventional power steering device, the inner valve 12 is connected to the input shaft 70. The inner diameter of the cylindrical inner valve 12 is set to be smaller than the outer diameter of the input shaft 70 so that it can be easily inserted and inserted. The diameter is somewhat larger and a slight gap δ is formed between these two 12 and 70. , this gap δ is a low pressure part communicating with the reservoir 50 side, so when steering, the inner - When high pressure is applied to the three grooves 12A at every other valve 12, the inner valve 12 is slightly deformed into a rice ball shape and the roundness of the inner valve 12 is low. When the inner valve 12 is rotated, it gets caught with the outer valve 11, In addition, the valve clearance of valves 11 and 12 is increased to allow high-pressure oil to flow to the low-pressure oil side. There was a risk of leakage. In addition, this phenomenon is caused by the increase in the size of vehicles in recent years. It is becoming more and more prominent due to the high output and high pressure of power steering devices due to high performance and high performance. It is starting to grow.

[0007] This invention was devised to solve the above problem. The inner valve that makes up the control valve is not deformed by pressure oil. To rotate smoothly and prevent oil leakage inside the control valve. In addition to making the steering feel lighter, it also supports higher output power steering devices. The aim is to provide a power steering device that can reduce the size of the oil pump by increasing the size of the oil pump. It has been the target.

[0008]

[Means to solve the problem]

The power steering device of the present invention includes an input shaft that rotates by operating a steering handle, and The output shaft is located on the same axis as the input shaft and can rotate relative to the input shaft, and the output shaft is connected to the outer periphery of the input shaft. The inner valve rotates integrally with the outer valve formed on the inner surface of the output shaft. The control valve is equipped with a control valve consisting of a The control valve is activated and the pressure oil discharged from the main pump is transferred to the power cylinder. It is designed to assist the steering force by supplying it to one of the chambers of the steering wheel. is formed between the inner circumferential surface of the inner valve and the outer circumferential surface of the input shaft. A sealing member for sealing the gap between the two is interposed between the two, and the inner A radial hole is provided in the lub to introduce the pressure oil into the gap. .

[0009]

[Effect]

According to the present invention, the control valve is actuated by rotating the input shaft. Then, the pressure oil introduced into the control valve by the oil pump flows into the inner - is also introduced into the gap between the inner valve and input shaft through the hole in the valve, and the inner - The pressure acting on the outer circumferential surface of the valve is offset by the pressure of the pressure oil introduced to the inner surface. deformation of the inner valve can be prevented.

0010

【Example】

Hereinafter, the present invention will be explained based on the embodiment shown in FIGS. 1 and 2. Furthermore, Figure 1 is a book. A sectional view showing the main parts of an embodiment of the power steering device of the invention, FIG. 2 is a cross-sectional view of the power steering device shown in FIG. 1. FIG. 3 is a sectional view showing a control valve of the device.

[0011] The control valve 10 of the power steering device of this embodiment is as shown in FIGS. 1 and 2. into a valve housing 90 fitted to one end of a gear housing (not shown). The outer valve 11 is formed directly on the inner peripheral surface of the shaft hole 61 of the output shaft 60 that is inserted. and a cylindrical inner valve 12 fitted into the outer valve 11. has been done. This inner valve 12 is fitted to the input shaft 70 and It is connected to the shaft 70 by a pin 80 so as to rotate integrally with the input shaft 70. It is composed of Further, the output shaft 60 and the input shaft 70 are inserted into the shaft holes of both of them. The input shaft 70 is connected to the input shaft 70 through a torsion bar 100 passed through the input shaft 70. When the input shaft 70 is rotated by operating a steering handle (not shown), both of these are rotated relative to each other.

0012 As shown in FIG. 2, there are six outer valves 11 as in the conventional case. Each groove 11A has a power cylinder 3 installed every other time. There are three holes 11B' communicating with either one of the chambers 31 and 32 of At the same time, three holes 11B'' communicating with the other chamber are formed, and each groove Six holes 11C are formed between the holes 11A, and three of these holes 11C' Every other hole is connected to the oil pump 40, and the remaining three holes 11C'' are connected to the oil pump 40. Every other hole communicates with the reservoir, and each of these holes 11B and 11C are both conventional It has the same function as the one. In addition, the inner valve 12 also has the same groove as the conventional one. Equipped with 12A in 6 locations.

[0013] Furthermore, as shown in FIG. 1, the inner circumferential surface of the inner valve 12 has a A slightly enlarged diameter part 12B is formed, leaving the remaining part, and is inserted into the input shaft 70. In this state, a gap is formed around the input shaft 70. Both axial directions of this enlarged diameter portion 12B On the side, the gap formed by the outer peripheral surface of the output shaft 60 and this enlarged diameter portion 12B is sealed. Seal members 110, 110 are respectively attached. In addition, the expanded diameter portion 1 A radial hole 12C is bored in 2B, and the outer valve is inserted through this hole 12C. High pressure oil from the pump 40 introduced from the hole 11C' of No. 11 is introduced into the gap δ. It is configured to

[0014] Note that the end of the output shaft 60 fits into the outer periphery of the inner valve 12, and Both the output shaft 60 and the input shaft 70 are rotatably supported relative to the valve housing 90. It constitutes the inner race of the ball bearing 120 held by the ball bearing 120. This ball ball The outer race of the adjusting ring 120 is an adjuster fixed to the valve housing 90. is secured to the bottom of the valve housing 90 by a stinging plug 130 .

[0015] Next, to explain the operation of the power steering device of this embodiment, the steering wheel is operated. The input shaft 70 rotates and is controlled from the hole 11C' of the outer valve 11. When high pressure oil from the oil pump 40 is introduced into the valve 10, this high pressure oil flows through the hole 11. It is supplied to one chamber 31 of the power cylinder 30 through the hole 11B' adjacent to C'. 2 to move the piston 20 to the right in FIG. At this time, the control valve 10 The high pressure oil introduced into the inner valve 1 passes through the hole 12C of the inner valve 12. 2 and the output shaft 60, and the inner valve flows from this gap δ. The pressure applied to the inner peripheral surface of the inner valve 12 is equal to the pressure applied to the outer surface of the inner valve 12. This cancels out the pressure applied to the outer surface of the inner valve 12 and causes the inner valve 12 to The roundness of the inner valve 12 can be maintained without causing distortion. Ru.

[0016] Therefore, according to this embodiment, the inner valve 12 is connected to the oil pump 40. It is not deformed by the action of high pressure oil introduced into the control valve 10. It maintains a perfect circle and rotates smoothly to prevent oil leakage inside the control valve 10. In addition to preventing this, it also makes the steering feel lighter, which in turn improves the power steering system. The oil pump 40 can be downsized in response to higher output. Also, Provides a power steering device that contributes to energy saving as the oil pump 40 becomes smaller. can do.

[0017] Note that the power steering device of the present invention is not limited to the above-mentioned embodiments, and may be formed between the inner circumferential surface of the control valve's inner valve and the input shaft outer circumferential surface. A sealing member to seal the gap is interposed between these two, and a sealing member is installed between the inner valve. A hole is provided in the radial direction to introduce pressure oil from the oil pump into the gap. If there are any, they are all included in the present invention.

[0018]

[Effect of the idea]

As explained above, according to the present invention, the control is performed using high pressure oil from the oil pump. The inner valve that makes up the roll valve rotates smoothly without deformation, and the It is possible to prevent oil leakage inside the control valve and to improve operation. The oil pump has been designed to make the steering feel lighter and to correspond to the higher output of the power steering system. It is possible to provide a power steering device that can be downsized.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing essential parts of an embodiment of a power steering device of the present invention.

FIG. 2 is a sectional view showing a control valve of the power steering device shown in FIG. 1;

FIG. 3 is a view corresponding to FIG. 2 showing a control valve of a conventional power steering device.

[Explanation of symbols]

10 Control valve 11 Outer valve 12 Inner valve 12C hole 40 Oil pump (main pump) 60 Output shaft 61 Shaft hole 70 Input shaft 110 Seal member

Claims (1)

[Scope of utility model registration request] 1. An input shaft that is rotated by operation of a steering handle, an output shaft that is arranged on the same axis as the input shaft and is rotatable relative to the input shaft, an inner valve that is connected to the outer periphery of the input shaft and rotates integrally with the input shaft, and It is equipped with a control valve consisting of an outer valve formed on the inner surface of the output shaft.The control valve is actuated by rotating the steering wheel, and the pressure oil discharged from the main pump is supplied to one chamber of the power cylinder for steering. In the power steering device configured to assist the force, a sealing member for sealing a gap formed between the inner peripheral surface of the inner valve and the outer peripheral surface of the input shaft is interposed between the two, and A power steering device characterized in that the inner valve is provided with a radial hole so that the pressure oil is introduced into the gap.