JPS6291367A - Spool type control valve used for power steering of car - Google Patents

Abstract

PURPOSE:To effect damping on valve vibration by virtue of a throttle effect to prevent the generation of self-exciting vibration and noise during various steering and to smooth switching motion, by providing a chamber port communicated to a reaction chamber. CONSTITUTION:A reaction chamber 26 is provided for producing a reaction force by means of an inner pressure in asociation with a reaction spring 18, and a reaction chamber port 30, through which a pump port 21 bored in an inner diameter of 0.5-1mm is communicated with the reaction chamber 26, is provided. Thus, the throttle effect of the reaction chamber port 30 causes sufficient damping on vibration of a valve, and prevents production of self- exciting vibration during steering in force steering during a stop, driving-aside, switchback, and low speed running. This prevents the generation of noise due to self-exciting vibration of a valve, smooths switching motion of a valve, and enables improvement of practically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use/Related Applications This invention relates to a two-J control valve used in power steering of automobiles, and more specifically, a two-J control valve suitable for linkage type power steering. ．． Concerning an improved spool type control valve.

BACKGROUND ART Conventionally, spool-type control valves incorporated in this type of linkage-type power steering have sometimes generated abnormal noise during steering, and damping of valve vibrations has been insufficient.

OBJECTS AND PROBLEMS OF THE INVENTION The object and problem of the present invention is to provide a spool for use in automobile power steering, which provides sufficient damping for valve vibration and prevents the generation of abnormal noise due to automatic vibration of the valve. Provides mold control valves.

Summary of the Invention: Contents of the Claimed Invention In relation to the above-mentioned purpose and problem, the spool-type control valve used in the power steering of an automobile, which is the invention of Party B, has a spool-type control valve. a valve body having a chamber and a pump port communicating with the spool chamber, a pair of power cylinder boats, and a pair of tank ports; The pump is arranged so as to be reciprocally slidable and has a reaxidine chamber therein, and further has a reaxidine chamber bored with an inner diameter of 0.5 mm to 1 mm to communicate the pump port with the reaxidine chamber. It consists of a spool with a boat and a rear axis spring for the spool.

DESCRIPTION OF EMBODIMENTS Preferred embodiments of the spool-type control valve used in power steering for automobiles according to the present invention will be described below with reference to the drawings.

The diagram shows linkage-type power steering for trucks 4
1 shows the M-body side 10 of the spool-type control valve of the present invention applied to configure 0.

The control valve 10 was pivotally connected to a link lever (not shown) that was connected to a knuckle arm (not shown) via a drag ring (not shown) on the eMII rudder. A compensating rod (not shown) incorporated in the power cylinder 41;
The valve is operated by the steering wheel (not shown) via a pitman arm (not shown) and a manual steering gear box (not shown), and the hydraulic circuit of the power steering 40 , the oil is discharged from the oil pump 42, and the flow control valve 4
3, the flow rate is adjusted and the pressure oil is transferred to the power cylinder 41.
It also returns the pressure oil worked by the power cylinder 41 to the suction side of the oil pump 42, and connects the valve body 11, spool 12, and spool.
Shirt 13 and a pair of Reaxidin plungers 14
．． 15, a pair of spool stoppers 16, 16, a pair of plunger stops 17, 17, and a rear axis spring 18. Of course,
The power cylinder 41 incorporating this control valve 10 is its link.

a cylinder body 46 pivotally connected to the lever;
A power piston 48 is arranged in a cylinder bore 47 of the cylinder body 46 so as to be able to slide back and forth, and an operating rod 49 has one end fixed to the power piston 48 and the other end pivotally connected to the side of the cylinder. It is configured.

The valve body 11 is assembled into a cylinder body 46 of a power cylinder 41, and has a pump port 21 opened to a spool chamber 19, and a pair of power cylinders.
It is equipped with a cylinder boat 22.23 and a pair of tank boats 24.25.

Also, the pressure oil whose flow rate is adjusted by the flow control valve 43 is transferred to the cylinder of the power cylinder 41.
The pump port 21 formed in the valve body 11 for supplying the chamber 50.51 is on the supply side of the hydraulic line 44, and the power cylinder boat 22.23 is connected to the hydraulic line 44. On the cylinder side of 44.45, furthermore, its tank ports 24.25 are respectively connected to its hydraulic line 45.

The spool 12 has a large diameter plunger bore 28 at one end of its reactive chamber bore 27 and a small diameter plunger bore 29 at the other end of its reactive chamber bore 27, and has a pump port. A rear axidine chamber boat 30 is provided which connects the rear axidine chamber 21 to the rear axidine chamber 26 thereof.

Furthermore, the spool 12 is connected to the pump port 21
It is provided with a ring groove 31.32 forming a spool oil chamber for switching connection of the power cylinder boat 22.23 to its power cylinder boat 22.23.

In addition, in this spool 12, the reactor chamber boat 30 is bored with an inner diameter of 1 mm, and due to the throttling effect, the self-excited vibration of the spool 12, that is, the valve, is suppressed until +L L, and the abnormal noise due to the automatic vibration is suppressed. This prevents the occurrence of

By the way, when we investigated the rear axis chamber port 30 of various inner diameters (1 method) in the rear axis spool type control valve, which is incorporated in the power steering system that is commonly used in automatic lit, The rear axis chamber boat 30 has an inner diameter of 0, 5 +nl11~1
If the hole is drilled in the range of mm, the automatic vibration of the valve will be prevented and no abnormal noise will be generated due to the automatic vibration. A pair of spool stoppers 16.16 are located at opposite ends of the spool 12 and fix the spool 12 so that the spool 12 can be passed through the spool chamber 20 and slid back and forth into the spool chamber 20. 4ML,
(IBM is connected to the compensating rod.

Furthermore, regarding the fixing structure of the spool 12 (in detail, the spool shaft 13 is fitted onto one end side of the spool shaft 13 so as to be located between the spool stoppers 16 and 16). sleeve-shaped spacer 33 and its spool shaft 13
The spool 12 is clamped to a pair of spool stoppers 16.16 fixed to one end side of the spool shear 771-13 by a nut 34 screwed to one end, thereby fixing the spool 12.

The spool stoppers 16, 16 are formed in the shape of a plate, and have two small holes 35 opened in the stopper surface at predetermined positions and spaced apart from each other by a predetermined distance.

The rear axis plunger 14 , 15 is formed with a large diameter and a small diameter one, and the large diameter rear axis plunger 14 slides reciprocally into the large diameter plunger bore 28 and the spacer 33 on the spool shaft 13 . A small-diameter reaction plunger 15 is reciprocally slidably fitted into the small-diameter plunger bore 29 and a spacer 33 on the spool shaft 13 and is formed within the spool 12 and has a reaction shaft formed therein. The chamber 26 is closed.

In this way, the reason why the rear axis plunger 14.15 is designed to have a large diameter and a small diameter is that when the power cylinder 41 of the power steering 40 is retracted, the driver is not able to steer the cylinder. It feels heavy, and when the power cylinder 41 extends, the driver feels that the steering is light.In other words, there is a difference in the left and right steering forces, so the steering force for right and left turns is different. It is to equalize.

The pair of plunger stops 17.17 each consist of two bottles protruding from both inner end faces of the spool bore 200;
6 through the small hole 35, and abuts the tip against the corresponding large diameter and small diameter rear axis plunger 14.15 to restrict the movement of the rear axis plunger 14.15 toward the inner end surface of the spool bore 20, Along with the movement of the sprue shaft 13, the rear axis
In cooperation with the spring 18, it provides a pumping action to the re-axis plungers 14, 15, compressing the oil filling the re-axis chamber 26 and varying the reaction force felt on the spool shaft 13.

The rear axis spring 18 is arranged around the spool shaft 13, i.e. the spacer 33, between the rear axis plungers 14.15 and imparts a pumping action to the rear axis plungers 14.15, and the valve Therefore, it functions as a neutral spring, or in other words, a centering spring.

Next, the operation of the power steering system 4o that incorporates the control valve 10 and its control valve 1°, which are configured as a double series, will be explained.

Now, when the internal combustion engine is operated, the oil pump 42 is driven, and the pressure oil supplied from the oil pump 42 is regulated by the flow control valve 43 to maintain a predetermined flow of pressure oil. A mouse is sent to the pump port 21 of the control valve 10.

Pressure oil sent to the pump port 21 is primarily routed through the hydraulic line 45 to the tank port 24. if the spool 12 is in the neutral position as shown.
25 and is returned to the suction side of the oil pump 42,
When the steering wheel is steered, its spool shaft 13 is pushed and pulled in the opposite direction via the manual steering gear box, pitman arm, and compensating rod, and the spool 12 is - If it is slid in the direction of the movement of the shaft 13, then according to the movement of the spool 12,
The pressure h#I passes through the cylinder side of hl+l pressure distribution 44.45 and enters the cylinder chamber 5 of the power cylinder 41.
0.51 inclination or one side and Reaxilon chamber 2
Sent to 6.

The reaction force against the steering is generated by the rear axis chamber 26
The pressure within and the throttle effect of the rear Axilon chamber bow 1- drilled with an internal diameter of 1 mm, even when its steering wheel is relatively slowly and slightly steered, provided by the rear Axilon spring 18. The control valve 10 provides sufficient damping against valve vibrations, prevents automatic vibration of the valve, and provides smooth valve switching operation of the control valve 10, especially when the oil pump 42 has a low flow rate. Smooth valve switching even in scenic areas.

Conveniences and Benefits of the Invention From the foregoing, it can be seen that the spool-type control valve used in the power steering of an automobile according to the present invention is better compared to the spool-type control valve used in the power steering of an automobile that has already been proposed and used. A spool-type control valve has a spool chamber connected to the valve body such that the spool switches between a pump port, a pair of power cylinder ports, and a pair of tank ports formed in the valve body. It is equipped with a Reaxilon chamber that is arranged to be able to slide back and forth and is cooperated with a Reaxilon spring to apply a reaction force with internal pressure.It is also provided with a Reaxilon chamber that is bored with an inner diameter of 0.5 + nm to 1 mm, and its pump port is connected to the Reaxilon chamber. Since the spool-type control valve used in the power steering of an automobile according to the present invention is equipped with a rear axis chamber boat that communicates with the rear axis chamber, the throttle effect of the rear axis chamber boat provides sufficient protection against valve vibration. Damping is performed, and the automatic vibration of the valve that occurs during turning b1 width closing, turning back, and steering at low speeds is stopped l111, and the occurrence of abnormal noise due to the automatic valve vibration is prevented, and the valve is switched. The operation is performed smoothly and the practicality is improved.

As for the relationship between the invention and the specific examples, from the specific examples of the present invention described with reference to the drawings, various design modifications will be apparent to those who have ordinary knowledge in the technical field to which this invention pertains. Modifications and modifications may easily be made, and furthermore, the subject matter of this invention can easily be transformed into a mode that is essentially the same as the invention that satisfies the object of the invention and achieves the effects of the invention. will be replaced by

[Brief explanation of drawings]

The figure is an axial sectional view showing a specific example of the spool-type control valve of the present invention applied to a linkage-type power steering system for a truck. 11... Valve body, 12... Spool, 13...
- Spool ° shaft, 14) 15... A pair of Reaxilon plungers, 16... A pair of spool stoppers, 17... A pair of plunger stoppers, 18.
... Reaxilon spring, 26 ... Reaxilon chamber, 30°° Reaction chamber boat, 41 ... Power cylinder, 42 ... Oil pump,
43...Flow control valve.

Claims (1)

[Claims] A valve body including a spool chamber, a pump port, a pair of power cylinder ports, and a pair of tank ports communicated with the spool chamber, and these ports are switched and connected. an inner diameter of 0.5 m, which is reciprocally slidably disposed in the spool chamber and has a reaction chamber therein, and further communicates the pump port with the reaction chamber.
A spool-type control valve used for automobile power steering, comprising a spool with a reaction chamber port drilled to 1 mm to 1 mm, and a reaction spring for the spool.