JPH0227232Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a vehicle height adjustment mechanism provided in a hydraulic damper.

(Prior Art) In motorcycles for off-road driving, the hydraulic dampers are lengthened to increase the height of the vehicle and maintain high performance on rough roads.

(Problem to be solved by the present invention) However, when this type of motorcycle is used for normal driving, that is, on-road, the problem arises that the vehicle has a high height as described above, and the footing is poor. .

Therefore, the purpose of the present invention is to provide a vehicle height adjustment mechanism for a hydraulic damper that lowers the vehicle height when driving an off-road vehicle on the road to improve footing, thereby enabling comfortable on-road driving. It is in.

(Means for Solving the Problems) In order to achieve the above object, the present invention forms an oil chamber in the upper metal of a hydraulic damper, and uses a piston fitted to the outer periphery of the piston rod to open the oil chamber.
The lower chamber is divided into sections, and these upper and lower chambers are communicated with each other by an oil passage, and a part of this oil passage is made into two parallel oil passages, and one of these two parallel oil passages is equipped with a check mark. A valve was provided, and a spool valve for opening and closing these oil passages was provided running vertically between the two oil passages.

(Example) An example of the present invention will be described below based on the accompanying drawings.

1 to 3 are longitudinal sectional views of the vehicle height adjustment mechanism 1 according to the present invention. In the figures, 2 is a piston rod of a hydraulic damper, the upper end of which is screwed to the lower part of the upper metal 3. It passes through the lid member 4 and faces into the upper metal 3. A piston 5 is attached to the outer periphery of the upper end bolt portion 2a of this piston rod 2.
The piston 5 is connected by a nut 6 screwed onto the bolt 2a, and the nut 6 is inserted into the groove 3 formed in the upper metal 3.
A is fitted in a vertically slidable manner.

By the way, an oil chamber S is formed in the upper metal 3 as shown in the figure, and the oil chamber S is connected to an upper chamber _S1 and a lower chamber by the piston 5 which is fitted to the peripheral wall of the oil chamber S so as to be vertically slidable. These upper and lower chambers S ₁ and S ₂ are _filled with hydraulic oil.
In addition, stop levers 7 and 8 are provided on the upper and lower surfaces of the piston 5. Further, in the figure, 9 is a ventilation hole.

On the other hand, a valve case 10 is connected to the side of the upper metal 3, and an oil passage 11 is formed in the valve case 10 to allow the upper and lower chambers S ₁ and S ₂ to communicate with each other. The oil passage 11 includes parallel oil passages 11a and 11b as shown in the figure, and a check valve 12 is provided in the oil passage 11a and is urged downward by a spring 13. Note that the check valve 12 has a plurality of oil holes 12.
a... is drilled. Also, both oil passages 11a, 11
A spool valve 14 is provided extending vertically through b, and a notch 15a is provided in a part of the spool 15 of the spool valve 14, and the end thereof is connected to an operation section (not shown) via a wire 16.

Next, the operation of the vehicle height adjustment mechanism 1 will be explained.

When the off-road motorcycle is traveling off-road, if the notch 15a of the spool 15 is adapted to the oil passage 11a as shown in FIG.
1b is closed, and as the piston rod 2 operates, the oil in the lower chamber _S2 passes through the oil passage 11a, uses its pressure to push open the check valve 12, and flows into the upper chamber _S1 . In this case, the presence of the check valve 12 prevents the flow of oil from the upper chamber S ₁ to the lower chamber S ₂ , and the piston rod 2 moves downward with respect to the upper metal 3 as the piston rod 2 operates, and the stop lever 8 moves against the lid member 4 . Stop at the position of contact. in this way,
Since the piston rod 2 moves downward relative to the upper metal 3 and remains stationary, the vehicle height of the motorcycle is increased, and the motorcycle can fully demonstrate its functions as an off-road vehicle.

Next, when the motorcycle is used for on-road use, the notch 1 of the spool 15 is
5a is adapted to the oil passage 11b, the upper and lower chambers S ₁ ,
_S2 communicate with each other via the oil passage 11b, and the piston rod 2 is in a state where it can freely move up and down with respect to the upper metal 3. Therefore, when the motorcycle is stopped, the piston rod 2
moves upward relative to the upper metal 3, and comes to rest at a position where the stop lever 7 is in contact with the upper wall surface of the oil chamber S, as shown in FIG. In this state, the notch 15a of the spool 15 is inserted into both oil passages as shown in FIG.
If it is located between 1a and 11b, the upper and lower chambers
Communication between S ₁ and S ₂ is completely cut off, and the piston rod 2 is locked in the state shown in the figure, and as a result, the vehicle height of the motorcycle is adjusted to be low. in this way,
When riding a motorcycle on-road, the vehicle height is adjusted lower, improving the footing.
This allows for comfortable on-road driving.

(Effects of the invention) As is clear from the above explanation, according to the invention, in a motorcycle for off-road driving, the hydraulic damper is shortened to lower the vehicle height when driving on-road, which improves footing. , comfortable on-road driving is achieved.

[Brief explanation of the drawing]

1 to 3 are longitudinal sectional views of the vehicle height adjustment mechanism according to the present invention. In addition, in the drawing, 1 is a vehicle height adjustment mechanism, 2 is a piston rod, 3 is an upper metal, 5 is a piston, 1
0 is a valve case, 11, 11a, 11b are oil passages, 12 is a check valve, 14 is a spool valve, 15 is a spool, 15a is a notch, S is an oil chamber,
S ₁ is the upper chamber and S ₂ is the lower chamber.

Claims (1)

[Scope of utility model registration request] An oil chamber S is formed in a metal member fitted to the end of the piston rod 2 of the hydraulic damper, and the oil chamber is divided into upper and lower chambers S1 and S2 by a piston connected to the outer periphery of the piston rod. The upper and lower chambers are communicated with each other through an oil passage 11, and a part of this oil passage 11 is formed into two parallel oil passages 11a and 11b, and one oil passage 11a of these two parallel oil passages 11a and 11b. is provided with a check valve 12,
The vehicle height adjustment mechanism for a hydraulic damper is characterized in that a spool valve 15 for opening and closing these oil passages 11a and 11b is provided to extend vertically through the two oil passages 11a and 11b.