JP2694641B2 - Height adjustment device for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for adjusting a vehicle height of a motorcycle. (Prior Art) In a large motorcycle, since the vehicle height is high, it is difficult for an occupant to put his / her foot on the ground when the motorcycle is stopped. Therefore, there has been devised a vehicle height adjusting device that lowers the vehicle height when the vehicle is stopped and traveling at a low speed and raises the vehicle height when traveling at a high speed. As a conventional vehicle height adjusting device for a motorcycle, there is one disclosed in Japanese Patent Publication No. 59-32356. As shown in FIG. 3, this device includes electromagnetic leak valves 4 and 5 connected to a rotary switch 1 connected to a shaft of a speedometer of a two-wheeled vehicle, a front fork 2 and a rear hydraulic shock absorber 3 and pressures. The surge tank 12 connected to the response changeover switches 6 and 7, the front fork 2 and the rear hydraulic shock absorber 3 via check valves 8 and 9 and solenoid valves 10 and 11, and air to the surge tank 12. Air pump to supply
13 and an electric motor 14 that drives the air pump 13. With this configuration, the electromagnetic leak valves 4 and 5 are excited by the rotary switch 1 to stop the front fork 2 when the motorcycle is stopped and running at low speed.
Also, the inside of the rear hydraulic shock absorber 3 becomes atmospheric pressure, and the solenoid valves 10 and 11 are cut off from the power source by the pressure response changeover switches 6 and 7, and the air in the surge tank 12 is also released to the atmosphere. The height is kept low. At this time, the electric motor 14 is stopped. Further, when the motorcycle runs at high speed, the rotary switch 1 activates the electric motor 14 to operate the air pump 13 to raise the air pressure in the surge tank 12. At this time, since the electromagnetic leak valves 4 and 5 are closed, the air in the surge tank 12 is sent into the front fork 2 and the rear hydraulic shock absorber 3 and the vehicle height gradually rises. (Problems to be solved by the invention) However, in the conventional vehicle height adjusting device described above, a special mechanism for adjusting the vehicle height such as the surge tank 12, the air pump 13 and the electric motor 14 is attached, or, Wiring for controlling them has to be performed, but in a large motorcycle or the like, there is a problem that the parts are complicatedly assembled and the installation place is restricted, so that the installation is not easy. Further, there is a problem that the number of parts constituting the device is large and the cost is high. The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle height adjusting device for a two-wheeled vehicle, which has a compact configuration and reduces cost. (Means for Solving the Problem) As a means for solving the above problems, a cylinder for changing the stroke length of the rear suspension by moving a plunger at one end of the rear suspension by supplying and discharging lubricating oil pressure of a traveling engine. A chamber is provided, and a first pipeline for supplying the lubricating oil pressure from the main gallery of the engine to the cylinder chamber by a hydraulic pressure generation source of the engine is provided through a check valve, and the cylinder chamber and the oil of the engine are provided. The pan and the control valve are connected to each other via the second pipe, and the control valve is connected to the third pipe branched from the hydraulic pipe of the front brake, and the control valve is opened by the hydraulic pressure of the front brake. The cylinder chamber and the second pipeline are communicated with each other. Things. (Operation) According to this configuration, since the engine is rotating at high speed when the motorcycle is traveling at high speed, the hydraulic pressure source proportional to the engine speed also rotates at high speed. Therefore, the lubricating oil pressure in the main gallery of the engine in which the lubricating oil flows becomes high, and the lubricating oil pressure of high pressure is press-fitted into the check valve through the first pipe line and opened to be supplied to the cylinder chamber. As a result, the plunger moves in the extension direction, the stroke length of the suspension increases, and the vehicle height increases. Further, when the front brake is operated to drive or stop at a low speed, the operating hydraulic pressure flows through the third pipe and flows into the control valve, and the control valve is opened to connect the cylinder chamber and the second pipe. further,
Since the engine rotates at a low speed, the pressure of the engine oil pressure generation source also drops, and the oil pressure in the main gallery of the engine drops, so the check valve closes and the supply of oil liquid to the cylinder chamber also stops. The plunger moves in the direction of shortening. As a result, the oil liquid in the cylinder chamber is returned to the oil pan of the engine through the second conduit. Therefore, the stroke length of the suspension becomes short and the vehicle height becomes low. (Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. A cylinder portion 17 is formed on the upper support 16 above the rear suspension 15 (see FIG. 2), and together with the plunger 18 sliding in the cylinder portion 17,
A cylinder chamber 19 is formed. An O-ring 20 is provided on the outer circumference of the plunger 18 that slides in the cylinder chamber 19. A piston rod 21 slidably penetrates through the plunger 18, and an oil seal 22 and a dust seal 23 are provided on the sliding portion to keep the cylinder chamber 19 in an airtight state. A dust boot 24 is attached to the outer circumference of the cylinder chamber 19 of the upper support 16 and the outer circumference of the plunger 18 so that dust does not enter the sliding surface between the cylinder portion 17 and the plunger 18. A buffer coil spring 25 is in contact with the lower surface of the plunger 18, and
Biasing 18 upwards. A supply port 26 for supplying an oil liquid, which is lubricating oil, to the cylinder chamber 19 is formed on the upper surface of the upper support 16, and one end of the supply port 26 is connected to the main gallery 28 of the traveling engine 27. High pressure hose 29 (Fig. 2)
The other end (see FIG. 3) is attached by the connector 30. The check valve 31 is connected to the supply port 26 and the connector 30.
The check valve 31 has a supply port 26
By the spring 32 provided in the recess 26a of
The spherical valve element 33 is biased so as to block the narrow passage 30a of the connector 30. The check valve 31 prevents the reverse flow of the oil liquid from the cylinder chamber 19 to the main gallery 28 of the engine 27. The traveling engine 27 usually has a built-in hydraulic pressure generation source (not shown) such as a hydraulic pump for supplying lubricating oil to each drive unit. That is, in the engine 27, a crankshaft (not shown) of the engine 27 is provided with a hydraulic pressure source in which a shaft portion is connected. In the case of the present embodiment, this hydraulic pressure source causes the engine 27 to rotate. During operation, lubricating oil is pumped to each part of the engine 27 and the cylinder chamber 19 of the rear suspension 15 via the main gallery 28. The lubricating oil pressure of the main gallery 28 corresponds to the rotation speed of the engine 27 that drives the oil pressure generation source, and the rotation speed of the engine corresponds to the traveling speed of the two-wheeled vehicle. Therefore, the lubricating oil pressure of the main gallery 28 rises and falls according to the traveling speed of the two-wheeled vehicle, and the high oil pressure is supplied to the high pressure hose 37 during high speed traveling and the low oil pressure during low speed traveling or stop. become. Further, a lubricating oil pressure outlet 34 is formed on the upper surface of the upper support 16, and is a low pressure hose 37 (FIG. 2) which is a second conduit connected to an oil pan 36 of the engine 27 via a control valve 35. Are installed). Inside the control valve 35 is a cylinder chamber 39 in which a piston 38 is slidably fitted.
39 is hydraulic piping 40a for front brake 40 (see Fig. 2)
The low pressure hose 41, which is the third conduit branched from
The hydraulic pressure of the front brake 40 is applied to the piston 38. A spring 42 is provided on the lower surface of the piston 38 to keep the piston 38 constantly
That is, the pressure sensitive hose 41 is biased. Further, the spring 43 provided in the concave portion 34a of the discharge port 34 urges the spherical valve element 44 to press and close the passage 35a formed in the control valve 35. A rod 45 is attached to the lower surface of the piston 38, and the rod 45 penetrates the passage 35a and abuts on the spherical valve element 44. By doing so, when the hydraulic pressure of the front brake 40 becomes larger than the biasing force of the spring 42 that biases the piston 38,
The piston 38 descends, the rod 45 pushes the valve element 44 downward, opens the passage 35a, and the oil liquid is discharged from the cylinder chamber 19. Next, the operation of the above configuration will be described. When traveling at high speed, the oil pressure of the lubricating oil in the main gallery 28 of the engine 27 becomes high (3 Kg / cm ² or more) due to the oil pressure generation source along with the high speed, and this high-pressure oil liquid passes through the high-pressure hose 29 to check valve. It is supplied into the cylinder chamber 19 via 31. Then, the plunger 18 is lowered against the urging force of the buffer coil spring 25 to increase the stroke length of the suspension 15 and increase the vehicle height. At this time, even if the hydraulic pressure of the main gallery 28 of the engine 27 is temporarily reduced, the vehicle height is maintained by the check valve 31. Next, when the front brake 40 is operated, the working oil pressure passes through the pressure sensitive hose 41 and the piston of the control valve 35 is operated.
38, the piston 38 is lowered and the rod 45
The cylinder chamber 19 and the low pressure hose 37 are communicated with each other by separating 44 from the passage 35a. At this time, since the traveling speed is slow, the pressure of the oil pressure generation source is low, the oil pressure of the lubricating oil in the main gallery 28 of the engine 27 also decreases, and the urging force of the check valve 31 cannot be overcome, No oil liquid is supplied into the cylinder chamber 19. Therefore, the plunger 18 is
As a result, the oil liquid in the cylinder chamber 19 is discharged to the low pressure hose 37. The discharged oil liquid is returned to the oil pan 36 of the engine 27 through the low pressure hose 37.
As a result, the stroke length of the suspension 15 is shortened and the vehicle height is lowered. In the idling state when the motorcycle is stopped, the hydraulic pressure of the engine main gallery 28 is low (0.5 Kg / cm ² ), so that the cylinder chamber 19 is not supplied with oil liquid and the vehicle height does not rise. Further, for example, even if an operation such as idling to increase the rotation of the engine is performed to increase the hydraulic pressure of the main gallery 28 of the engine 27, the passage 30a provided in the check valve 31 may be used. However, the vehicle height does not rise sharply because it acts as an orifice, and the vehicle height directly decreases when the front brake is operated. (Effects of the Invention) According to the present invention as described above, the engine rotates at high speed when the two-wheeled vehicle runs at high speed, so that the hydraulic pressure in the main gallery in which the lubricating oil flows increases in proportion to the engine speed. Since the high pressure oil liquid is supplied to the cylinder chamber by opening the check valve through the first conduit and moving the plunger in the extension direction, the stroke length of the suspension can be lengthened. As a result, the vehicle height becomes high and stable traveling can be performed. Further, when the front brake is operated when the two-wheeled vehicle runs at low speed or is stopped, the hydraulic pressure flows through the third conduit to open the control valve. As a result, the cylinder chamber communicates with the second conduit, the engine rotates at a low speed, the hydraulic pressure in the main gallery of the engine decreases, the check valve closes, and the hydraulic pressure supply to the cylinder chamber stops. Since the plunger moves in the shortening direction, the lubricating oil pressure is discharged to the oil pan from the second pipe line. As a result, the stroke length of the suspension is shortened, the vehicle height is lowered, and the occupant can surely place his / her foot on the ground. In this way, by using the oil pressure of the lubricating oil in the engine, the stroke length of the suspension is adjusted to be longer when traveling at high speed, and the stroke length of the suspension is adjusted so that the vehicle height becomes lower when traveling at low speed or when stopped. Since it is adjusted to be short, a special pump for vehicle height adjustment, a drive source, a large number of valve mechanisms, etc. are not required. Therefore, even a motorcycle with a small installation space can be easily equipped. Further, the cost can be significantly reduced because the number of components is small.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part of a vehicle height adjusting device according to an embodiment of the present invention, and FIG. 2 is a motorcycle equipped with the vehicle height adjusting device shown in FIG. FIG. 3 is a diagram showing a configuration and an electric circuit of a conventional vehicle height adjusting device. 15 …… Rear suspension 17 …… Plunger 19 …… Cylinder chamber 28 …… Engine main gallery 29 …… High pressure hose 31 …… Check valve 35 …… Control valve 36 …… Engine oil pan 37 …… Constant pressure hose

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yukihiro Takasaki               231-1 Shirahane-cho, Hamamatsu City, Shizuoka Prefecture Suzuki-so               A309                (56) References JP-A-57-191177 (JP, A)

Claims (1)

(57) [Claims] A cylinder chamber is provided at one end of the rear suspension to change the stroke length of the rear suspension by moving and supplying the lubricating oil pressure of the running engine, and the lubricating oil pressure is supplied to the main engine by the engine oil pressure source. A first pipe line for supplying from the gallery to the cylinder chamber is provided via a check valve,
The cylinder chamber and the oil pan of the engine are connected by a second conduit via a control valve, and a third conduit branched from a hydraulic pipe of the front brake is connected to the control valve to connect the front brake of the front brake. A vehicle height adjusting device for a two-wheeled vehicle, wherein the control valve is opened by operating hydraulic pressure so that the cylinder chamber and the second pipe line communicate with each other.