JPH0724244Y2 - Hydraulic shock absorber for vehicle shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hydraulic vehicle height adjusting device for a vehicle shock absorber.

[Conventional technology and problems to be solved]

An electro-hydraulic vehicle height adjusting device for a vehicle shock absorber is known, for example, from Japanese Patent Laid-Open No. 55-79776. This schematic is shown in FIGS. 6 and 7. 1 is a damper cylinder, 2 is a piston, 3 is a piston rod, 4 is a suspension spring, 5 is a rebound spring, 6 is a rubber stopper, 7 is a spring bearing fixed to the outer circumference of the piston rod, 8 is a vehicle body side mounting member, Reference numeral 9 is an axle side mounting member, 10 is a vehicle height adjusting piston configured as one member of a vehicle height adjusting device fixed to an upper end of a piston rod, 11 is a vehicle height adjusting cylinder configured as the other member, and 12 is It is a spring bearing fixed to the outer circumference of the cylinder. In order to make it easier to understand when pressure oil is supplied to the upper port of the vehicle height adjusting cylinder 11 in the state before the vehicle height is increased by one passenger in FIG. Assuming that the height adjustment piston 10 is stationary and only the vehicle height adjustment cylinder 11 rises, the vehicle height rises as shown in Fig. 7 and the mounting length increases from L ₁ to L ₂ , but the suspension spring initial setting Since the load does not change, when the vehicle height is increased, the same riding comfort as when driving in a flat city area can be obtained. However, since the total stroke l _t does not change, it is not possible to absorb a large thrust when traveling on a wasteland. Further, since the mounting length of the shock absorber after the vehicle height is increased at the maximum compression is increased by the stroke of the vehicle height adjusting piston 10, a large space is required between the vehicle body and the axle.

Further, in the case of this vehicle height adjusting device, since the electric pump is used as the hydraulic drive source of the vehicle height adjusting cylinder 11, in addition to the equipment itself being expensive, a battery having a large capacity is required, It is costly and disadvantageous in terms of weight and size.

Therefore, the object of the present invention is to increase the stroke and lengthen the stroke without changing the initial load of the suspension spring when the vehicle height increases.
Another object of the present invention is to provide a hydraulic vehicle height adjusting device for a vehicle shock absorber having a configuration in which the mounting length of the shock absorber at the time of maximum compression does not change.

[Means for Solving the Problems]

In order to achieve the above object, a hydraulic vehicle height adjusting device for a vehicle shock absorber according to the present invention mounts a damper cylinder on one of a vehicle body side and an axle side via a mounting member, and the inside of the damper cylinder is attached to the vehicle body side. Alternatively, the piston rod mounted on the other side of the axle side via the mounting member slides via the piston, and a suspension spring is arranged between the damper cylinder and the piston rod, and one end of this suspension spring is connected to the piston rod. In a vehicle hydraulic shock absorber supported by a spring bearing, a vehicle height adjusting cylinder is provided on the mounting member for mounting the piston rod on one of the vehicle body side and the axle side, and the piston rod is provided with a hydraulic pressure medium in the vehicle height adjusting cylinder. A vehicle height adjusting piston that slides through the means is provided, and a stopper rubber sheet is provided on the damper cylinder side of the vehicle height adjusting cylinder. The spring receiver is provided with an opening through which the stopper rubber sheet is inserted in the axial direction, and a stopper rubber for restricting the maximum compression stroke of the shock absorber is arranged between the stopper rubber sheet and the damper cylinder. It is characterized by

The spring bearing may include a spring bearing that supports one end of a suspension spring and a connecting member that fixes the spring bearing to the piston rod.

〔Example〕

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 and 2 show a lower portion of a rear cushion 20 of a motorcycle having a hydraulic vehicle height adjusting device according to the present invention. The cross section of FIG. 2 is a cross section having an angle of 90 ° with the cross section of FIG.

This rear cushion 20 includes a damper cylinder 21 (5th cylinder).
(See the drawing) It has a piston rod 23 protruding from a piston 22 which is slidable inside. A suspension spring 26 is arranged between an upper spring bearing 24 fixed to the damper cylinder 21 and a lower spring bearing 25 attached to the piston rod 23. 27 is a vehicle body side mounting member, 28 is an axle side mounting member, 29
Indicates a damper rubber.

A gas filled hydraulic vehicle height adjusting device 30 according to the present invention has a vehicle height adjusting piston 32 fixed to a piston rod 23 via a rod 31, and a vehicle height adjusting cylinder 33 formed on an axle side mounting member 28. . An upper end opening of the vehicle height adjusting cylinder 33 is closed by a lid 34. The spring bearing 25 is a rod protruding upward from the vehicle height adjusting cylinder 33 of the axle mounting member 28.
It is connected to the piston rod 23 via a flat plate-shaped connecting member 35 supported on the upper end of 31. A stopper rubber 29 is supported on the vehicle height adjusting cylinder 33 of the axle side mounting member 28 via a stopper rubber sheet 36 having a plurality of leg portions 36a. The connecting member 35 is provided with an opening 35a through which the leg portion 36a of the stopper rubber sheet passes so that the stopper rubber sheet 36 can be displaced together with the vehicle height adjusting cylinder 33. Incidentally, 37 is a lock nut.

A pipe joint 39 is connected to a port B'opened to an oil chamber below a vehicle height adjusting cylinder 33 partitioned by a piston 32, and a cutout portion 40 opened to an upper oil chamber has a through hole passing through a cylinder wall. The pipe joint 42 of the port A ′ is connected via 41.

Next, FIGS. 3 and 4 show a front fork 50 of a motorcycle having a vehicle height adjusting device.

The inner cylinder 52 is slidably fitted in the outer cylinder 51 (see FIG. 5), and the piston 54 is slidably mounted in a damper cylinder 53 extending upward from the bottom of the outer cylinder 51. A piston rod 55 extends upward from this piston through the rod guide 53a. A suspension spring 56 is arranged between a spring bearing 57 at the upper end of the damper cylinder and a spring bearing 58 fixed to the piston rod 55.

In the vehicle height adjusting device 60 of the present invention for the front fork, a hollow portion having an opening on the lower side is formed in the lower portion of the lid member 61 which is a vehicle body side mounting member screwed into the upper end of the inner cylinder 52,
A vehicle height adjusting cylinder 62 is inserted into the hollow portion from below. Inside this vehicle height adjustment cylinder 62, the vehicle height adjustment piston 63
Is slidably fitted. A rod 64 screwed to the piston rod 55 is screwed to the vehicle height adjusting piston 63. Further, an outer cylinder 65 having an inner circumference spaced from the outer circumference of the vehicle height adjusting cylinder 62 is screwed into the lower side of the lid member 61, whereby the outer cylinder 65 and the vehicle height adjusting cylinder.
An annular oil passage 66 is formed between 62. An end plate 67 is attached to the lower end of the vehicle height adjusting cylinder 62, and a cap 68 that supports the end plate 67 is screwed into the outer cylinder 65.

As the oil passage for supplying pressure oil to the vehicle height adjusting cylinder 62, the port B is connected to the lid member 61, the oil passage 69 opening to the upper oil chamber defined by the piston 63, and the lower oil passage. A through hole 71 is opened in the chamber, the through hole communicates with the upper oil passage 72 through the annular oil passage 66 described above, and communicates with the port A through the oil passage 72 through the oil passage 73. .

FIG. 5 shows a hydraulic connection circuit for operating the hydraulic fork height adjusting devices 30 and 60 of the front fork and the rear cushion. Reference numeral 81 is a tank having a gas chamber 83 and an oil chamber 84 which are partitioned by a flexible partition member 82, and the gas chamber is filled with a pressurized gas of about 50 to 60 kgf / cm ² .
The control unit 85 is provided with checks arranged in the pipelines a, a'connecting the oil chamber 84 in the tank with the port A of the lower oil chamber of the front fork and the port A'of the upper oil chamber of the rear cushion. The valve 86, the oil chamber 84 in the tank, and the pipes b, b'connecting the port B of the upper oil chamber of the front fork and the rear cushion and the port B'of the lower oil chamber of the rear cushion are arranged. A check valve 87, and a vehicle height up button 88 and a vehicle height down button 89 which are check valve releasing means for opening both check valves 86, 87 are provided. Both check valves 86 and 87 are arranged in a direction that prevents backflow from the oil chamber of the vehicle height adjusting cylinder.

[Action]

The operation of each vehicle height adjusting device for the rear cushion constructed as described above will be described mainly with reference to FIG.

In the state before the vehicle height increase of the rear cushion in FIG. 1 and the front fork in FIG. 3, the pressure of the gas filled in the tank 81 passes through the check valves 86 and 87, the pipe lines a, b and a ′, b ′,
The state is shown in which the vehicle height adjusting pistons 32, 63 act on the upper and lower surfaces and one passenger (1G) rides on and is in equilibrium. In this state, pressure fluctuations caused by vibrations of the upper and lower surfaces of the vehicle height adjusting pistons 32 and 63 are prevented from being transmitted to the oil chamber 84 of the tank 81 because of the check valves 86 and 87. At this time, since the upper and lower chambers of the vehicle height adjusting piston 32 of the rear cushion are respectively communicated with each other by the pipeline a ′ communicating with the pipeline a and the pipeline b ′ communicating with the pipeline b, the vehicle height of the front fork is increased. The lower chamber of the adjusting piston 63 and the upper chamber of the vehicle height adjusting piston 32 of the rear cushion communicate with each other to have the same pressure. Therefore, the pressure receiving area of the vehicle height adjusting piston of the rear cushion having a large suspended load is increased.

When driving from the city to the wasteland in this state, the occupant gets off the motorcycle and connects with the inner cylinder 52 of the front fork that suspends the front part of the vehicle body. When it is pulled up, the oil chamber under the vehicle height adjusting piston 63 is compressed, so that the oil passes from the port A through the pipe line a and acts on the check valve 86.
At this time, the check valve 86 blocks the flow in this direction. Therefore, when the vehicle height up button 88 is pressed to open the ball of the check valve away from the valve seat portion, the hydraulic oil and the pressurized tank passing therethrough are discharged. Check valve 87 for hydraulic oil from oil chamber 84
Is pushed up, and is displaced and flows into the oil chamber above the vehicle height adjusting piston 63 of the front fork through the pipe line b, and the vehicle height adjusting cylinder 62 and the inner cylinder 52 fixed thereto are attached to the outer pipe 51. Pull up. Similarly, when the rear cushion also lifts the rear vehicle body or swings the vehicle body back and forth to compress the upper hydraulic pressure of the vehicle height adjusting piston 32 of the rear cushion, the working oil passes through the oil passage a ′. Check valve
Reaching 86. At this time, the check valve 86 is a vehicle height up button
Since it is lifted by the tip rod of 88 and is separated from the seat portion, the hydraulic fluid passes through the check valve 86 and reaches the check valve 87. Since the check valve 87 opens for the flow of hydraulic oil in this direction, the check valve 87 passes through the check valve 87 and further through the oil passage b ′, and the flow is displaced to the lower chamber of the vehicle height adjusting piston to adjust the vehicle height. The cylinder 33 is displaced downward with respect to the vehicle height adjusting piston 32 to increase the vehicle height. In this way, the mounting lengths of the front fork and the rear cushion are increased, and the vehicle height is increased from L ₁ to L ₂ , respectively, as shown in FIG. 4 and FIG.
It becomes the state of the figure. In this state, the vehicle height adjusting piston 32,
Check valve 8 for pressure fluctuations in the oil chambers above and below 63.
It is blocked by 6, 87 and does not reach the tank. That is, the vehicle height is locked in the increased state.

Next, when lowering the vehicle height from the vehicle height increasing state, if the vehicle height down button 89 is pressed to release the check valve 87,
The conduits b and b'communicate with the conduits a and a'through the check valve 86. At this time, the occupant moves the inner cylinder 52 and the vehicle height adjusting cylinder 62 up and down by adding or removing weight to and from the vehicle while keeping the riding posture.
Of the hydraulic oil in the upper oil chamber of the vehicle passes through the check line 87 from the pipe line b, part of which flows to the oil chamber 84 of the pressurization tank and then to the pipe line a through the check valve 86 to the lower part of the vehicle height adjusting piston 63. It flows into the oil chamber, and the vehicle height adjusting cylinder 62 and the inner cylinder 52 are pulled down. Similarly, the hydraulic oil in the lower chamber of the vehicle height adjusting piston of the rear cushion is compressed and passes through the line b ′, the check valve 87, and partly into the oil chamber 84 of the pressurized tank and the check valve 86.
The vehicle height adjusting cylinder 33 moves upward with respect to the vehicle height adjusting piston 32 by the displacement and flow in the upper oil chamber of the vehicle height adjusting piston. In this way, the vehicle height is lowered from L ₂ to L ₁ . The oil chambers of the vehicle height adjusting cylinders of the front fork and the rear cushion, which expand when the vehicle height is increased, and the oil chambers that contract (the opposite is true when the vehicle is down) are connected by pipe lines a and a ', and pipe lines b and b'. Therefore, the front-rear balance of the vehicle height can be efficiently achieved by appropriately setting the pressure receiving area of the vehicle height adjusting piston.

As in this embodiment, when the oil chamber of the vehicle height adjusting piston of the front fork and the oil chamber of the vehicle height adjusting cylinder of the rear cushion are branched downstream of the check valves 86 and 87, the pressure tank 81 and the check valve Since 86 and 87 can be shared, only one pressure tank 81 is needed, and the cost is low.
Of course, one pressure tank and one check valve can be provided for each of the front fork and the rear cushion.

[Effect of device]

According to the configuration of the vehicle height adjusting device of claim 1, when it is considered that the piston rod is stationary when oil is supplied,
The vehicle height adjusting cylinder is displaced to increase the vehicle height.At this time, the stopper rubber sheet and stopper rubber provided on the damper cylinder side of the vehicle height adjusting cylinder pass through the opening of the spring receiver and move downward without resistance. Can be displaced,
As a result, the compression stroke between the stopper rubber seat and the damper cylinder is lengthened by the amount of vehicle height adjustment, so it is possible to absorb a large amount of push-up during rough terrain travel and the mounting length of the shock absorber during maximum compression does not change. Therefore, it does not require a large space between the vehicle body and the axle unlike the conventional case. Further, since the piston rod is not pulled out from the damper cylinder when the vehicle height increases, the rebound stroke does not change and the total stroke does not change.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a rear cushion of a motorcycle equipped with a vehicle height adjusting device according to the present invention, showing a state before vehicle height adjustment, and FIG. 2 is a rear cushion after increasing vehicle height of the rear cushion of FIG. Fig. 3 is a partial sectional view showing a state, Fig. 3 is a partial sectional view of a front fork of a motorcycle equipped with a vehicle height adjusting device according to the present invention, showing a state before vehicle height adjustment, and Fig. 4 is a front view of Fig. 3. FIG. 5 is a diagram showing a state after the vehicle height of the fork is increased, FIG. 5 is a hydraulic connection circuit diagram for operating the gas-filled hydraulic vehicle height adjusting devices 30 and 60 of the front fork and the rear cushion, and FIG. FIG. 7 is a schematic view of a rear cushion having a vehicle height adjusting device, showing a state before the vehicle height adjustment, and FIG. 7 is a schematic diagram showing a state where the vehicle height adjusting device of FIG. 6 is actuated to increase the vehicle height. It is a figure. 23,25 …… Piston rod, 25,58 …… Spring bearing, 28 ……
Axle side mounting member, 29 …… Stopper rubber, 30,60…
… Vehicle height adjustment device, 32,63 …… Vehicle height adjustment piston, 33,62…
… Vehicle height adjustment cylinder, 35 …… Coupling member, 35a …… Opening, 36 …… Stopper rubber sheet, 81 …… Tank, 82
...... Partition member, 83 ...... Gas chamber, 84 ...... Oil chamber, 86,87 ......
Check valve, 88, 89 ... Check valve release means

Claims (2)

[Scope of utility model registration request] 1. A damper cylinder is mounted on one of a vehicle body side and an axle side via a mounting member, and a piston rod mounted inside the damper cylinder on the other side of the vehicle body side or the axle side via a mounting member is provided with a piston. In a hydraulic shock absorber for a vehicle in which a suspension spring is disposed between a damper cylinder and a piston rod, and one end of the suspension spring is supported by the piston rod through a spring receiver.
A vehicle height adjusting cylinder is provided on the mounting member that attaches the piston rod to one of the vehicle body side and the axle side, and a vehicle height adjusting piston that slides in the vehicle height adjusting cylinder via the hydraulic pressure mediating means is provided on the piston rod. A stopper rubber sheet is provided on the damper cylinder side of the vehicle height adjusting cylinder, and an opening is formed in the spring bearing for the stopper rubber sheet to pass through in the axial direction, and between the stopper rubber sheet and the damper cylinder. A hydraulic vehicle height adjusting device for a vehicle shock absorber, comprising a stopper rubber for restricting a maximum compression stroke of the shock absorber. 2. The hydraulic pressure for a vehicle shock absorber according to claim 1, wherein the spring bearing comprises a spring bearing for supporting one end of a suspension spring and a connecting member for fixing the spring bearing to the piston rod. Type vehicle height adjustment device.