JPH03143795A - Height adjusting device for motorcycle - Google Patents

Abstract

PURPOSE:To lower the height of a motorcycle at the time of parking and improve the stability by providing a blow valve opened by the increase of the pressure oil of a suspension in a height adjusting part, and further opening the blow valve by the standing operation of a side stand. CONSTITUTION:A height adjusting part 15 has a spool valve 47 rotatably dis posed as a height switching valve in the center position of an adjusting part body 46, and by rotating the spool valve 47 by an adjusting operating part 48 integrally connected thereto, the feed and discharge of pressure oil to a suspension is controlled to adjust a height. In this case, in the adjusting part body 46, a blow valve 63 in which a ball 66 is moved against a spring 69, when the pressure oil of each suspension is reached to a determined pressure or more, to discharge the pressure oil of each suspension to a reservoir tank 31 is pro vided. The blow valve 63 can be switched to open position through an interlocking cable 75, a correction lever 74 and a cam, when a side stand 23 is stood up at the time of vehicle stop.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a vehicle height adjustment device for a motorcycle that adjusts the vehicle height by changing the lengths of a front suspension and a rear cushion unit.

(Prior Art) A vehicle height adjustment device that allows a rider to adjust the vehicle height of a two-wheeled motor vehicle using a front suspension and a rear cushion unit is disclosed in Utility Model Application No. 1-3854.
Although it is stated in the specification of the No. 1 application, it has not been made public to the public.

The vehicle height adjustment device described in the above-mentioned Utility Model Application No. 1-3854 connects the front suspension and the vehicle height adjustment section and the vehicle height adjustment section and the rear cushion unit with hydraulic hoses to adjust the vehicle height. By supplying or discharging pressure oil from the front suspension and rear cushion unit through these hydraulic hoses to the hydraulic jacks of the front suspension and rear cushion unit, the lengths of the front suspension and rear cushion unit are changed and the vehicle height is adjusted.

(Problem to be solved by the invention) In a motorcycle to which such a vehicle height adjustment device is applied,
The vehicle is configured to be able to stably stop when the vehicle height is set to Low and the side stand is operated to stand up.

However, when the vehicle is stopped, a rider may operate the side stand to raise the vehicle height without switching the vehicle height from a high state to a low state. In such a case, the angle of inclination of the vehicle body becomes large and the stopped posture becomes unstable, so there is a risk that the vehicle will overturn.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a vehicle height adjustment device for a motorcycle that can improve vehicle stability when the vehicle is stopped.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a cushion unit equipped with a hydraulic jack that allows adjustment of vehicle height, a front suspension equipped with a hydraulic jack that allows adjustment of vehicle height, and a rear cushion unit as described above. A vehicle height adjustment device for a motorcycle, comprising: a vehicle height adjustment section equipped with a vehicle height switching valve capable of transmitting hydraulic pressure of pressure oil in the vehicle to the two hydraulic jacks via a hydraulic hose; is equipped with a blow valve that opens when the pressure oil in the two hydraulic jacks and the hydraulic hose rises and discharges the pressure oil in the two hydraulic jacks and the hydraulic hose. It is characterized in that it is configured to open the valve even when the valve is opened.

(Function) Therefore, according to the vehicle height adjustment device for a motorcycle according to the present invention, when the side stand is raised and the vehicle is stopped, the blow valve opens and the pressure oil in the hydraulic hose and the hydraulic jack is discharged. Therefore, when the vehicle is stopped using the side stand, the initial loads of the front suspension and rear cushion unit are reduced, and the vehicle height can always be brought to a low state. As a result, the angle of inclination of the vehicle body when the vehicle is stopped becomes small, and the stability of the vehicle can be improved.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partial side view of FIG. 2, and FIG. 2 is an overall side view showing a motorcycle to which the vehicle height adjustment device for a motorcycle according to the present invention is applied.

As shown in FIG. 2, a front fork 2 that supports the front wheel 1 is arranged in front of a body frame 3, and a rear wheel 5 supported by a rear suspension 4 is arranged behind the body frame 3. . A seat 6 is arranged above the body frame 3, and a rider rides the vehicle by riding on the seat 6 and operating a steering wheel 7.

The front fork 2 is an inverted front fork,
It is configured with two left and right front suspensions 8 and 9. These front suspensions 8 and 9 are connected to an upper bracket 10 and an under bracket 1.
1 is supported by the vehicle body frame 3 via a steering shaft and a head pipe (not shown). These front suspensions 8 and 9 absorb shocks from the front wheels 1 and damp vibrations.

The rear suspension 4 also includes a swing arm 13 that pivotally supports the rear wheel 5 and is supported by the body frame 3 by a pivot 12, and a swing arm 13 whose upper end is supported by the body frame 3 and whose lower end is connected via a link mechanism (not shown). and a cushion unit 14 supported by a swing arm 13. Swing arm 1 centered on pivot 12
The rear cushion unit 14 absorbs the vertical vibration of the vehicle 3 and damps the vibration, thereby alleviating the impact on the rear wheel 5.

Now, the front suspensions 8 and 9 and the rear cushion unit 14 are equipped with hydraulic jacks 50, which will be described later.
．． 49 are formed respectively, and a vehicle height adjustment section 15 is arranged near the rear cushion unit 14. The hydraulic jack 50 of the front suspension 8.9 and the vehicle height adjustment section 15 are connected by a hydraulic hose 16 on the front side of the vehicle, and the hydraulic jack 4 of the rear cushion unit 14 is connected to the hydraulic jack 50 of the front suspension 8.9.
9 and the vehicle height adjustment unit 15 are connected by a vehicle rear side hydraulic hose 17 to form a vehicle height adjustment device 18. A hose coupling device 19 is disposed in the middle of the hydraulic hose 16 on the front side of the vehicle.

In addition, in Fig. 2, the code 20 is the front fender, and the code 2 is the front fender.
1 is a headlamp housing, 22 is a seat rail of the body frame 3, 23 is a side stand, and 24 is an engine, and 25 is this engine 2.
This is the exhaust pipe connected to 4.

As shown in FIG. 3, the rear cushion unit 14 is
A coil spring 27 is arranged around the outer periphery of the rear oil damper 26. The rear oil damper 26 rapidly damps vibrations of the coil spring 27 by resistance when the pressure oil filled in the cylinder 28 passes through the small hole of the piston 29 and the valve 29A.

The inside of this cylinder 28 is communicated with the oil chamber 32 of the reserve tank 31 shown in FIG. 5 and FIG.
The amount of pressure oil inside is adjusted. Note that the inside of the reserve tank 31 is divided by a piston 33 into the oil chamber 32 and the air chamber 34 .

In addition, the front suspension 8°9 shown in Fig. 4 is
An inner tube 35 supported on the wheel side of the front wheel 1, and an outer tube 36 containing a built-in front oil damper.
Consisted of. The front oil damper rapidly damps vibrations of a spring 37 disposed within the inner tube 35.

Further, as shown in FIGS. 3, 4, and 7, the hose coupling device 19 disposed on the vehicle front side hydraulic hose 16 is connected to a front fork side joint portion 38A and a vehicle height adjustment portion side joint portion 38B. It consists of

These joint portions 38A and 38B are provided with pistons 40A within cylinders 39A and 39B, respectively.

40B, and hose connection parts 41A and 41B are fixed to the ends of the cylinders 39A and 39B, respectively. Two vehicle front side hydraulic hoses 16 are connected to the hose connection portion 41A of the front fork side joint portion 38A, and are connected to the front suspensions 8 and 9, respectively. Further, one vehicle front side hydraulic hose 16 is connected to the hose connection portion 41B of the vehicle height adjustment portion side joint portion 38B, and is connected to the vehicle height adjustment portion 15. Further, a bushing rod 42 is fixed to the piston 40A.

Further, on the outer periphery of the cylinders 39A and 39B, an outer cylinder 43A,
43B is loosely fitted. A female thread 44A is formed on each of these outer cylinders 43A and 43B.

44B, the front fork side joint part 38A and the vehicle height adjustment part side joint part 38B
are combined. At the time of this connection, the outer cylinders 43A and 43
B is locked by rings 45A and 45B, respectively, and the bushing rod 42 abuts against the piston 40B. Therefore, the pistons 40A, 40B are integrally moved together via the bush rod 42 due to fluctuations in the oil pressure of the pressure oil in the cylinders 39A, 39B.

Now, as shown in FIGS. 3 and 5, in the vehicle height adjustment section 15 of the vehicle height adjustment device 18, a spool valve 47 as a vehicle height switching valve is rotatably disposed in the center position of the adjustment section main body 46. An adjustment operation section 48 shown in FIG. 1 is integrally connected to this spool valve 47. By rotating the adjusting operation portion 48, the spool valve 47 is switched to the High side, which increases the vehicle height, or to the Low side, which decreases the vehicle height.

That is, by operating the adjustment operation section 48, the spool valve 47
When switched to the High side, the swinging of the swing arm 13 causes the piston 29 in the rear oil damper 26 shown in FIG. It flows as shown by the arrows C and Dl shown in FIG. 3 and the arrow E shown in FIG. Furthermore, the pressure oil that has flowed inside the vehicle height adjustment section 15 as shown by the arrow E passes through the vehicle front side hydraulic hose 16 and reaches the vehicle height adjustment section side joint section 38B'' of the hose coupling device 19 as shown by the arrow G. The hydraulic pressure of this pressure oil is transmitted to the hydraulic jacks 50 of the front suspensions 8 and 9 via the front fork side joint portion 38A shown in FIG.

As shown in FIG. 3, the hydraulic jack 49 has a jack piston 52 disposed in a jack cylinder chamber 51, and the amount of movement of the jack piston 52 is transmitted to a spring guide 54 via a spacer 53. spring 2
This is to change the initial load of 7. Therefore, when pressure oil flows into the jack cylinder chamber 51 of the hydraulic jack 49 from the vehicle height adjustment section 15, the jack piston 52 moves and pushes down the spring guide 54, and the rear cushion unit 14 extends, increasing the vehicle height. Make it expensive.

The hydraulic jacks 50 of the front suspensions 8 and 9 are connected to the outer tube 3 as shown in FIG.
A jack piston 56 is disposed in a jack cylinder chamber 55 installed in the jack piston 5, and the amount of movement of the jack piston 56 is determined by the plunger 57, the ring 58, and the spacer 5.
9 to the spring guide 60. The two vehicle front hydraulic hoses 16 are connected to the fork caps 61 of the left and right front suspensions, respectively, and guide the pressure oil in the vehicle front hydraulic hoses 16 into the cylinder cylinder chamber 55 .

Therefore, when the hydraulic pressure of the pressure oil is transmitted to the hydraulic jack 50 via the hose connection device 19, the jack piston 5
6 moves downward, the spring guide 60 pushes down the spring 37 to increase the initial load of the spring 37, and the front suspensions 8 and 9 extend to raise the vehicle height.

When lowering the vehicle height, the adjustment operation section 48 is rotated to switch the spool valve 47 to the LOW side. Then, due to the weight of the vehicle, the pressure oil in the hydraulic jack 49 (see FIG. 3) of the rear cushion unit 14 passes through the vehicle rear side hydraulic hose 17 and the oil path of the vehicle height adjustment section 15, and then enters the oil in the reserve tank 31. Return to room 32. Furthermore, hydraulic jacks 50 (
(See Fig. 4) is released from the front fork joint 38A of the hose connection device 19 due to the weight of the vehicle.
The vehicle height adjustment section side joint section 38B
The pressure oil inside passes through the vehicle height adjustment part 15 and is transferred to the reserve tank 31.
Return to the inside of the oil chamber 32.

In this way, the initial loads of the coil spring 27 of the rear cushion unit 14 and the springs 37 of the front suspensions 8 and 9 are lowered, the rear cushion unit 14 and the front suspensions 8 and 9 are contracted, and the vehicle height is lowered.

Note that a first blow valve 62 and a second blow valve 63 are arranged in the adjustment section main body 46, as shown in FIG. The first blow valve 62 is configured by a piston 64 biased by a spring 65. This first blow valve 62 is configured so that when the spool valve 47 is switched to the High side and the pressure oil flowing from the rear oil damper 26 through the connection hose 30 (see FIG. 3) reaches a predetermined pressure or higher, the piston 64 is activated. It rises against the biasing force of the spring 65 and discharges a portion of the pressure oil into the oil chamber 32 of the reserve tank 31 as indicated by arrow H.

Further, in the second blow valve 63, a ball 66 is loosely fitted into a bushing piece 67, and a spring 69 is disposed between the bushing piece 67 and a spring guide 68. Further, behind the spring guide 68, a vehicle height correction shaft 71 on which a cam 70 is formed is rotatably disposed. A roller 72 is loosely fitted onto the back surface of the spring guide 68 and engages with the outer peripheral surface of the vehicle height correction shaft 71 and the cam 70 . In addition, the code|symbol 73 is a cap.

This second blow valve 63 is the H4 of the spool valve 39.
When the vehicle jumps with the vehicle height switched to the GH side, when the oil pressure in the hydraulic jack 49 of the rear cushion unit 14 and the hydraulic jack 50 of the front suspensions 8 and 9 increases, the ball 66 resists the biasing force of the spring 69. and returns the pressure oil in the vehicle front side hydraulic hose 16 and the vehicle rear side hydraulic hose 17 into the oil chamber 32 of the reserve tank 41 as indicated by arrow I. This has the first function of preventing damage to both hydraulic hoses 16 and 17.

The second function of the second blow valve 63 is to correct the vehicle height by forcibly lowering the vehicle height when the vehicle is stopped.

That is, as shown in FIG. 1, a correction lever 74 is integrally fixed to the vehicle height correction shaft 71, and the correction lever 74 and the side stand 23 are connected by an interlocking cable 75. The correction lever 74 is urged upward by a return spring 74A. Further, the outer cable 76 of the interlocking cable 75 has an upper end fixed to the vehicle height adjustment section main body 46 by a cable bracket 77, and a lower end fixed to the side stand bracket 79 by a cable bracket 78. This side stand bracket 79 connects the side stand 23 to the vehicle body frame 3.
The point O is the center of rotation of the side stand 23 relative to the side stand bracket 79.

The inch cable 80 of the interlocking cable 75 has its upper end rotatably fixed to the correction lever 74 and its other end fixed to the upper end of the side stand 23 . The attachment position of the lower end of the inner cable 80 to the side stand 23 is determined by considering the bank angle when the side stand 23 is in the retracted operating state (indicated by the dashed line in FIGS. 1 and 2), that is, in the tJP state of the correction lever 74. It is set at a position above the rotation center O.

Therefore, when the side stand 23 is placed in the upright position (as shown by solid lines in FIGS. 1 and 2), the correction lever 74 is moved down via the inch cable 80 of the transmission cable 75.
At this time, as shown in FIG. 6, the vehicle height correction shaft 71 rotates and the cam 70 engages with the roller 72. As a result, the spring guide 68, the spring 69,
Since the bushing piece 67 and the ball 66 move toward the vehicle height correction shaft 71, the pressure oil in the hydraulic hoses 16 and 17 flows into the oil chamber 3 of the reserve tank 31 as shown by arrow I.
It is discharged into 2. Therefore, the hydraulic pressure of the pressure oil in each hydraulic jack 50.49 of the front suspensions 8 and 9 and the rear cushion unit 14 decreases, and the initial loads of the front suspensions 8 and 9 and the rear cushion unit 14 decrease, resulting in a reduction in vehicle height. is lowered to the same height as when the spool valve 47 is switched to the Low side.

According to the embodiment described above, when driving on rough terrain, the hydraulic jack 49 of the rear cushion unit 14 is adjusted by rotating the adjustment operation section 48 of the vehicle height adjustment section 15 and switching the spool valve 47 to the High side. The pressure oil in the rear cushion unit 14 is also force-fed to the hydraulic jacks 50 of the front suspension units 8 and 9 via the vehicle height adjustment section 15, so that the pressure oil in the rear cushion unit 14 and the front suspension units 8 and 9 are
Extend the length and raise the vehicle height to increase road clearance. Furthermore, when driving in urban areas, the spool valve 47 of the vehicle height adjustment section 15 is switched to the Low side to eliminate the pressure oil in the hydraulic jacks 49 and 50, and the length of the rear cushion unit 14 and front suspension units 8 and 9 is reduced. By shortening the length, the vehicle height can be lowered and the footing can be improved.

Further, the second blow valve 63 is connected to the vehicle height correction shaft 71.
, the valve is opened in conjunction with the upright operation of the side stand 23 via the correction lever 74 and the interlocking cable 75, and the pressure oil in the hydraulic hoses 16 and 17 is discharged into the oil chamber 32 of the reserve tank 31. therefore,
Stop the vehicle with the spool valve 47 switched to the High side using the adjustment operation section 48, and then turn the side stand 23
When you stand up, the hydraulic jack 49 of the rear cushion unit 14 and the front suspensions 8 and 9
The oil pressure in the hydraulic jack 50 decreases, and the cushion unit 14 and the front suspensions 8 and 9 contract, allowing the vehicle height to be lowered. As a result, the angle of inclination of the vehicle body when stopped by the side stand 23 becomes smaller,
Vehicle stability when stopped can be improved.

Further, the Lo of the spool valve 47 by the adjustment operation section 48
The second blow valve 63 also rotates when the side stand 23 is operated to stand up in the W side switching state, but at this time, the hydraulic jack 49 of the carrier cushion unit 14 and the hydraulic jack 50 of the front suspensions 8 and 9 are rotated.
Since the oil pressure inside the hydraulic hoses 16 and 17 is low, the pressure oil inside the hydraulic hoses 16 and 17 does not flow into the oil chamber 32 of the reserve tank 31, and the low vehicle height set by switching the spool valve 47 to the Low side is maintained. Also in this case, since the angle of inclination of the vehicle body is small, it is possible to improve vehicle stability when the vehicle is stopped.

Furthermore, since the second blow valve 63 rotates in conjunction with the raising operation of the side stand 23, the spool valve 47
If the vehicle is driven with the vehicle switched to the High side and the side stand 23 is used when the vehicle is stopped, the vehicle height can be raised simply by placing the side stand 23 in the retracted state when the vehicle is started.

In this way, by operating the side stand 23, the vehicle height can be automatically changed from the Low state to the High state or from the High state to the Low state.

〔Effect of the invention〕

As described above, according to the vehicle height adjustment device for a motorcycle according to the present invention, the blow valve is disposed in the vehicle height adjustment section, and the blow valve is connected to both the hydraulic jacks of the front suspension and rear cushion unit and the hydraulic hoses. The valve opens when the pressure oil rises, discharging the pressure oil in both hydraulic jacks and hydraulic hoses, and also opens when the side stand is raised, so the vehicle height can be reduced when the vehicle is stopped using the side stand. can be forcibly lowered, and as a result, the stability of the vehicle when the vehicle is stopped can be improved.

Shaft, 74... Correction lever, 75... Interlocking cable.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of Fig. 2, Fig. 2 is an overall side view showing a motorcycle to which the motorcycle height adjustment device according to the present invention is applied, and Fig. 3 is a rear cushion unit of Fig. 2. 4 is a sectional view showing the front suspension in FIG. 2, FIG. 5 is a sectional view taken along the line V-V in FIG. 3, and FIG. 6 is a sectional view showing the front suspension in FIG. FIG. 7 is a cross-sectional view showing the hose connection device of FIG. 2.

Claims (1)

[Claims] A rear cushion unit equipped with a hydraulic jack that allows the vehicle height to be adjusted; a front suspension that includes a hydraulic jack that allows the vehicle height to be adjusted; and the hydraulic pressure of the pressure oil in the rear cushion unit that is connected to the In a vehicle height adjustment device for a motorcycle, the vehicle height adjustment unit includes a vehicle height adjustment unit equipped with a vehicle height switching valve that can transmit pressure to both hydraulic jacks and the pressure in the hydraulic hose. A blow valve is provided that opens when the oil rises and discharges the pressure oil in both the hydraulic jacks and the hydraulic hose, and the blow valve is also configured to open when the side stand is raised. Vehicle height adjustment device for motorcycles.