JPH0431116A - Construction of valve system for level controlling device of hydraulic shock absorber for vehicle - Google Patents

Abstract

PURPOSE:To integrally assemble a valve system in a holder beforehand and simply and promptly assemble the valve system in an oil passage by connecting the holder that surrounds the outside of a ball valve with a valve seat to and from which the ball valve connects and separates, and interposing it in the opened oil hole of the oil passage drilled in a main body. CONSTITUTION:The cap 14 of a rear cushion 1 is connected to a level control ling changeover valve unit 60 through an oil passage 51, and further lead to a valve system 66 that generates compression side damping force through an oil passage 65. In this case, the oil passage 65 perpendicularly branches off downward before it reaches the valve system 66 and reaches an oil receiving room D through an oil passage 67, and a main valve system including a first check valve 68. And, the first check valve 68 is seated on a valve seat 70 by a spring 69 and energized to always close the opening to the oil receiving room D, and the spring 69 is forced to seat on a holder 71 that engages with the cylindrical extension of the valve seat 70, namely, the valve 68 and the valve seat 70 are assembled to the holder 71 to unite them in a body, and interpose to the cylindrical hole of the oil passage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a valve mechanism used in a vehicle height adjustment device for a hydraulic shock absorber for a vehicle.

[Conventional technology and problems to be solved] Pressure oil is sent to each jack unit provided in the front fork and shock suspension by the pumping action of a motorcycle's suspension, or the oil is transferred from the jack unit to each jack unit installed on the front fork and suspension. It is known to raise or lower the vehicle height by returning the vehicle to the storage chamber. Various valve mechanisms are used in this vehicle height adjustment hydraulic circuit, and these valve mechanisms are made by sequentially inserting parts such as ball valves, springs, and holders into cylindrical holes provided in the oil passage. However, this process was time-consuming and labor-intensive, and there was also the risk of parts being lost.

An object of the present invention is to provide a structure of a valve mechanism for a vehicle height adjustment device of a hydraulic shock absorber for a vehicle, which can be very easily assembled into a cylindrical hole provided in an oil passage.

[Means to solve the problem]

In order to achieve the above object, the valve mechanism according to the present invention connects a holder surrounding the outside of the ball valve to a valve seat on which the ball valve is seated, and opens an oil passage bored in the main body. Furthermore, it is advantageous for the reasons described below to include a bottle for pushing the ball valve away from the valve seat in the valve seat on which the ball valve is seated. .

Further, the outside of the spring for biasing the ball valve against the valve seat can be surrounded by a holder together with the ball valve.

〔Example〕

Hereinafter, an example in which the valve mechanism of the present invention is incorporated into a hydraulic circuit for adjusting vehicle height of a hydraulic shock absorber of a two-wheeled vehicle will be described in detail.

First, as shown in FIGS. 1, 2, and 3, a jack unit 10, a front fork 2, and a
A vehicle height adjustment device for a two-wheeled vehicle, which includes a jack unit 40, a vehicle height adjustment switching valve unit 60, a pipe joint 54, etc., provided in the vehicle will be described.

The rear suspension 1 includes a cylinder 3 having a member 2 attached to the vehicle body side at one end, a piston 4 slidably mounted in the cylinder 3, and a piston 4 that protrudes from the piston to the side opposite to the member 2 and is freely attached. The axle side mounting has a piston rod 6 having a member 5 at its end, and a suspension spring 9 is disposed between a spring receiver 7 provided at the end of the piston rod and a spring receiver 8 provided at the end of the cylinder. It is strung up.

The piston 4 is provided with a damping force generator as usual.

The rear cushion side jack unit 10 forming a part of the vehicle height adjustment device is connected to the cylinder 3 of the rear cushion 1.
A plunger case 12 is fixed to the sleeve, and a plunger 13 is slidably mounted between the inner peripheral surface of the plunger case 12 and the outer peripheral surface of the sleeve. The end surface of the spring receiver 8 is brought into contact with the extension part of the spring receiver 8 due to the pressure of the suspension spring 9. In this way, a rear-action hydraulic jack chamber B is formed between the plunger case 12 and the plunger 13.

An outer cylinder 22 is slidably fitted on the outside of the inner cylinder 21 of the front fork 20, and a spring receiver is fixed to the bottom of the inner cylinder 21 and the piston rod 23 via a spring collar sheet 24 and a spring collar 25. A suspension spring 27 is interposed between the spring 26 and the spring 26. A piston 29 attached to the lower end of the piston rod 23 described above is slidably fitted into a damper cylinder 28 extending upward from the bottom of the inner cylinder 21 . A rond 30 is connected with a screw to an end of the piston rod 23 that passes through the upper end of the damper cylinder 28 and projects upwardly within the inner cylinder 21 . An oil reservoir G with an air chamber in the upper part is formed on the outer periphery of the damper cylinder 28, and an oil hole 28 in the bottom side wall of the damper cylinder 28 is formed on the outer periphery of the damper cylinder 28.
It communicates via a.

A jack unit 40, which forms part of a vehicle height adjustment device, is attached to the upper end of the outer cylinder 22. This jack unit 1-40 is connected to a jack cylinder 41 which is inserted into the upper end opening of the outer cylinder 22 in a sealed state.
It has an annular fork bolt 43 screwed into the female thread of the outer cylinder 22 to fix the cylinder head cover. A pipe connection union bolt having a mouth fitting 44 is screwed onto the jack cylinder head cover 41. Jacque cylinder head cover 4
A jack cylinder 45 constituting the jack unit 40 is screwed into the lower part of the jack 1 and fixed with a nut 46. Inside this jack cylinder 45, there is a rond 3.
A jack piston 48 having a through hole 47 fixed to the upper end of the jack cylinder 4 is slidably fitted into the jack piston 48.
An end piece 49 is fixed to the lower end of 5.

A pump chamber A in the cylinder of the rear suspension 1 is connected to a vehicle height adjustment switching valve unit 60 via a fitting 14 and an oil passage 51.
The tension side jack is connected to the chamber B of the front fork side jack unit 10 by an oil passage 52, and the other side is connected to the chamber C of the two front fork side jack units 40 via an oil passage 53 and a pipe joint 54.

The vehicle height adjustment switching valve unit 60 is provided in a cap 62 of an oil tank 61, as shown in FIG. The oil tank 61 is partitioned into an oil reservoir chamber and a gas chamber by a partition wall 63.

In FIG. 1, the mouth fitting 14 of the rear cushion 1 passes through the oil passage 51 to the main body 62 of the vehicle height adjustment switching valve unit 60.
It is connected to the mouth fitting 64 of the valve 64, and is further guided through an oil passage 65 to a valve mechanism 66 that generates a compression-side damping force. This valve mechanism is not directly related to the gist of the present invention, so a detailed explanation will be omitted.

Before reaching the valve mechanism 66, the oil passage 65 branches downward at right angles, passes through the valve mechanism of the present invention (FIG. 2) including an oil passage 67 and a first check valve 68, and reaches the oil sump chamber. Ru. The first check valve 68 is urged by a spring 69 to seat on the valve seat 70 and close the opening to the oil sump at all times, and the spring 69 is fitted into a cylindrical extension of the valve seat 70. It is seated on a matching holder 71. In this manner, the valve mechanism of the present invention incorporates the valve 68 and the valve seat 70 into the holder 71, and inserts the valve 68 and the valve seat 70 as one body into the cylindrical hole of the oil passage. The holder 71 has a communication hole 72 and a central protrusion 73, as shown in FIG. 3.4. This protrusion 73 is provided to restrict the lift of the valve 68, since the ball-shaped HALPRO 8 tends to repeatedly hit the valve seat 70 violently due to pressure oil and crush the valve seat.

The compression side damping force generation valve mechanism 66 further includes an oil passage 74 (
(Fig. 1) and is led to the switching valve 75. This switching valve 75
has a rotatable valve body 76 inserted into a cylindrical hole, a circumferential groove is formed in this valve body by providing an eccentric cam-shaped portion 77, and a through hole is formed in the eccentric cam-shaped portion 77. 8
A second check valve 79 is housed therein and is biased by a spring 81 so as to keep the valve normally closed.

This switching valve 75 can take the vehicle height down position shown in FIG. 3 and the vehicle height up position shown in FIGS. 1 and 2 by rotating the switching valve 75 by 90 degrees and returning it by 90 degrees.

There are oil passages on three sides downstream of the switching valve 75, and the oil passage 82 on the right in FIG. 2 opens into the oil reservoir chamber, and the oil passage 83 on the left
It reaches an oil chamber F on the outer periphery of a relief valve 84 which is always urged to close by a spring, and the downstream side of this relief valve opens through an oil passage 85 to an oil reservoir chamber. The oil chamber F communicates with the jack chambers B and C downstream of the third check valve 87, so when the oil chamber of the jack chamber reaches a predetermined pressure after jacking is completed, the relief valve is activated. The oil passage 74 and the oil passage 85 are made to communicate with each other against the biasing force of the spring and the pressure difference between the respective pressure receiving surfaces of the relief valve.

As shown in FIG. 5, the central oil passage 8 downstream of the switching valve 75
The cylindrical hole 6 is provided with a valve mechanism of the present invention including a third check valve 87. This valve mechanism includes a valve seat 88, a pin 89 that is slidably inserted into a center hole of the valve seat 88 and has a vertical through hole in the center, and a third chain, a quarubu 87, that is directed toward the valve seat side. energizing spring 90, valve 87 and spring 9
The valve seat 88 is made up of a holder 91 that fits into the valve seat 88 in a state where 0 is accommodated. Therefore, if the holder 91 having the spring 90 and the valve 87 is previously fitted and integrated with the valve seat 88 having the pin 89, it can be easily assembled into the cylindrical hole during assembly.

The pin 89 has two cylindrical parts, a small diameter part and a large diameter part, and is slidably fitted into the small diameter hole and the large diameter hole at the center of the valve seat 88, respectively.

In the vehicle height down position shown in FIG. 3, the pin 89 is pushed by the circumferential surface of the switching valve 75, so the third check valve 87 is pushed against the spring 90 and released from the valve seat 88. In the vehicle height amplifier position shown in FIG.
9 is pushed by the spring 90 and retracted from the valve seat 88, the large diameter portion of the pin 89 comes into contact with the step between the large diameter hole and the small diameter hole at the center of the valve seat 88, and stops. A valve 87 seats on a valve seat 88.

The tip of the large diameter portion of the pin 89 has a reduced outer diameter and is shaped to relieve the sagging surface (FIG. 5a) that occurs when forming the seat surface of the valve seat 88. This sagging surface is caused by punching or the like when forming the seat surface of the ball valve 87.

An annular gap 93 is connected downstream of the third check valve 87 through a small diameter radial hole 92 formed in the holder 91.
It communicates with the oil passage 94 (Fig. 1) through the
4, the oil passage 95 passes through the oil passage 53 and the pipe joint 54 to reach the two front fork side jack units 40 on the one hand, and the rear suspension side jack unit 10 passes through the oil passage 52 on the other hand. Ru.

At the same time, the downstream side of the third check valve 87 is guided to the oil chamber F formed on the outer periphery of the relief valve 84 via the oil passage 96 on the left side of FIG. 2, and the oil passage 97 on the right side as shown in FIG. The blow valve is led to a flow valve 100 through which the blow valve opens into an oil reservoir chamber through an oil passage 101.

According to the present invention, the blow valve 100 has a valve seat 1
02, a valve 106 that is always biased by a spring 104 via a valve holder 105 so as to close the communication hole 103 of the valve seat 102, a spring 104, a pin 105,
It consists of a holder 107 that accommodates the valve 106 and fits into the valve seat 102.

The holder 107 has a circumferential groove 108 and a valve 1 between the circumferential groove and the circumferential groove.
A radial hole 109 communicating with the upstream side of 06 is provided. Similarly, in this blow valve mechanism 100, if the holder 107 containing the valve 106, the valve holder 105, and the spring 104 is fitted into the valve seam 02 and integrated in advance, this assembly can be inserted into the cylindrical hole during assembly. It can be easily assembled by inserting the holder 107 into the holder 107 and screwing it down.

This blow valve 100 always closes the valve seat 102, but when the vehicle height is being raised (FIG. 2), that is, at this time, the vehicle height adjustment switching valve 75 is in a position where the oil passage 82 communicating with the oil reservoir is closed. is set to Also, while the vehicle height is being raised, the oil pressure in the jack chambers B and C downstream of the third check valve 87 has not reached the predetermined pressure.
The relief valve 60 closes off an oil passage 74 communicating with the pump chamber A and an oil passage 85 communicating with the oil reservoir chamber. In such a case, if the vehicle jumps high into the air and then lands, and the oil chamber in the hydraulic shock absorber is abnormally pressurized, this pressurized hydraulic oil is transferred to the oil passage 67 that communicates with the oil sump chamber. .82.8
5 are all blocked, there is no escape and an oil lock condition occurs, leading to damage to any part of the hydraulic shock absorber and the hydraulic conduit of the vehicle height adjustment device. When the pressure of the hydraulic oil increases abnormally in this manner, the safety circuit is provided as a safety circuit that opens against the spring 104 and returns the oil to the oil reservoir chamber.

[Effect]

Next, vehicle height adjustment of a two-wheeled vehicle will be explained with reference to FIGS. 6 and 7. When driving in the city, the vehicle height adjustment switching valve 75 is rotated to switch to the vehicle height down position (FIGS. 3 and 6). During running, the pressure oil sent from the pump chamber A during the compression process of the reaction cushion 1 flows through the oil passage 51.65, but the oil passage 86 communicating with the jack chamber is closed by the second check valve 79 of the switching valve 75. Since it is closed, oil passage 8
2 and flows into the oil reservoir chamber of the oil tank 61. The gas chamber E performs volume compensation due to the displacement of the piston rod 6. During the extension process, oil corresponding to the volume of the piston rod removed flows into the pump chamber A from the oil reservoir chamber.

When starting to drive on rough terrain, set the switching valve 75 to the vehicle height up position (
(Fig. 2, Fig. 7), the reaction 1
During the compression process, the pressure oil from the pump chamber A passes through the circumferential groove 78 of the switching valve 75, passes through the vertical through hole of the pin 89, pushes up the third check valve 87, and flows into the oil passage 94. Further, on one side, the oil flows into the jacking chamber B of the rear shock 1 through the oil passage 52, and on the other hand, the oil flows through the oil passage 53 and the pipe joint 54, and the oil flows into the jacking chamber C of the front fork 20.
flows into. During the extension stroke of the reaction 1, the piston rod 6 moves out of the cylinder 3, reducing the pressure in the pump chamber A, and the third check valve 87 downstream of the switching valve 75 is sucked, closing the valve seat 88. , the first check valve 68 upstream of the oil tank 61 opens, so that the oil in the oil reservoir chamber of the oil tank 61 flows into the pump chamber A to replenish the amount of oil corresponding to the intrusion volume of the piston rod 6.

As described above, by repeating the compression and extension strokes of the suspension 1, a self-pumping action is performed, and oil is guided to the respective jack chambers B and C for each compression stroke, compressing the respective suspension springs 9 and 27. go. Since the vehicle body is balanced by suspension springs, the respective jack pistons 13 and 48 compress the suspension springs 9 and 27, thereby increasing the suspension spring load, pushing up the vehicle body and increasing the vehicle height.

When switching from rough terrain to city driving, the switching valve 75
When you switch to the vehicle height down position (Fig. 3, Fig. 6),
Since the pin 89 is pushed up and the third check valve 87 is separated from the valve seat 88, oil corresponding to the displacement of the piston in the jack chambers B and C of the rear shock 1 and front fork 20 flows into the open third check valve 87. It flows around the three-check valve 87, through the vertical through hole of the pin 89, and through the oil passage 8.
0, the second check valve 79 in the switching valve 75 is pushed open, and the oil flows through the circumferential groove 78 and the oil passage 82 into the oil reservoir chamber. As a result, the oil in the front fork and rear suspension jack chambers B and C is drained, causing the pistons 13 and 48 to move backward, thereby reducing the vehicle height.

〔Effect of the invention〕

In the valve mechanism of the present invention, a holder surrounding the outside of the ball valve is coupled to the valve seat on which the ball valve is seated and seated, and the holder is interposed in the oil hole where the oil passage bored in the main body opens. Compared to the conventional method, in which separate parts were assembled by sequentially inserting them into the cylindrical hole of the oil passage, if the valve mechanism is assembled into a holder in advance, it is very easy and quick to lubricate the valve mechanism. It can be installed on the road.

Furthermore, in the present invention, a holder surrounding the outside of the ball valve is coupled to the valve seat on which the ball valve is seated, including a pin for pushing the ball valve away from the valve seat, and Since it is inserted into the oil hole where the passage opens, it produces the same effect as before, and the ball valve can be opened by mechanically operating the pin.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an overall view of a vehicle height adjustment device consisting of a jack unit, a vehicle height adjustment switching valve unit, and a pipe joint installed in the rear traction and front fork of a motorcycle, respectively. 1 is a longitudinal cross-sectional view of the vehicle height adjustment switching valve unit including the valve mechanism of the invention taken along the line ■-■ in FIG. 1, with the switching valve in the vehicle height up position. Figure 3 is a longitudinal cross-sectional view of the vehicle height adjustment switching valve unit similar to Figure 2 with the switching valve in the vehicle height down position, and Figure 4 is a longitudinal cross-sectional view of the vehicle height adjustment switching valve unit along the line ■■ of the vehicle height adjustment switching valve unit in Figure 2. FIG. 5 is a partial sectional view of the vehicle height adjustment switching valve unit; FIG. 5a is an enlarged partial cross-sectional view of the vehicle height adjustment switching valve unit near the tappet; FIG. 6 shows the vehicle height adjustment hydraulic circuit when the switching valve is set to the vehicle height down position, and FIG. 7 shows the vehicle height adjustment hydraulic circuit when the switching valve is set to the vehicle height up position. 68;87;105...Valve, 70;88;102
・・・Valve seat, 71; 91;・Holder, Bin agent Mitsuyoshi Ezaki Agent Mitsufumi Ezaki Figure 50 Figure 61! 1 When the vehicle height is lowered Figure 7 When the vehicle height is raised

Claims (3)

[Claims] (1) A holder surrounding the outside of the ball valve is coupled to a valve seat on which the ball valve is seated and seated, and the holder is interposed in an oil hole opening of an oil passage bored in the main body. Structure of a valve mechanism for vehicle height adjustment device of vehicle hydraulic shock absorber. (2) A holder that surrounds the outside of the ball valve is connected to the valve seat on which the ball valve is seated, including a pin for pushing the ball valve away from the valve seat, and an oil passage drilled in the main body is opened. A structure of a valve mechanism for a vehicle height adjustment device of a hydraulic shock absorber for a vehicle, characterized in that the valve mechanism is installed in an oil hole. (3) A holder surrounding the outside of the ball valve and a spring for biasing the ball valve against the valve seat is coupled to the valve seat on which the ball valve is seated,
A structure of a valve mechanism for a vehicle height adjustment device of a hydraulic shock absorber for a vehicle, characterized in that the valve mechanism is installed in an oil hole where an oil passage is opened in a main body.