JPS6082494A - Rear cushion auto-damping-force varying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damping force variable device that automatically controls damping force adjustment during the extension process of a rear cushion unit in response to changes in road surface, driving conditions, and temperature conditions.

A rear cushion unit is generally a shock absorber that supports the rear wheels of motorcycles, and slides inside a cylinder.A piston rod equipped with a damping force generating mechanism is pulled out of the cylinder and fixed inside the piston rod. A coil spring is interposed between a spring holder provided on the outer periphery of the cylinder and a spring holder provided on the outer periphery of the cylinder, and the shock generated in the vertical direction of the wheel is reduced.

Conventionally, the damping force variable mechanism during the extension process of the rear cushion unit has been attached to the rear cushion unit body, and the damping force has been adjusted using a knife, hand, or tool. Therefore, when the cushion unit is attached to the rear wheel of a motorcycle, etc., a space is required to allow insertion of a hand or a tool into the damping force adjustment position. Not only is the position where the damping force adjuster mechanism can be attached to the rear cushion unit limited, but also the adjustment work is not easy depending on the conditions when the dust is stuck to this adjustment part.

Therefore, in Utility Application No. 58-68032, the applicant installed a remote control device on the outside of the rear cushion unit, which is configured so that when a knob is rotated, a first slider slides inside the cylindrical case, and A second slider connected to the first slider via a wire and sliding in a direction perpendicular to the first slider is provided in a mounting bracket fixed to the tip of the piston rod,
On the other hand, a bushing rod is slidably inserted into the piston rod, the base end of the bushing rod is brought into contact with the inclined surface of the second slider, and the needle at the tip is inserted into the oil passage that is opened during the extension process. We have proposed a remote-controlled extension-side damping force adjustment device.

However, this remote control method uses VC to operate by pushing and pulling the wire inside the pipe, so the pipe cannot be bent freely, and although the flexibility can be improved by using stranded wire for the wire, it is not possible to bend the pipe freely. Since it can only rotate in one direction, it is necessary to provide a separate return mechanism, which makes the mechanism complicated and expensive.

This invention eliminates the above-mentioned conventional inconveniences, and further advances rear cushion one-touch remote damping force variation, allowing the central processing unit (hereinafter referred to as CPU) to respond to changes in road surface, driving reliability, and temperature conditions. Riding comfort is optimized by controlling damping force. An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the variable damping force device of the present invention. In the figure, 1 is a cylinder, 2 is a piston that slides inside the cylinder 1 and is equipped with a damping force generation mechanism, and 3 is a piston rod. Although not shown in the figure, the tip of the cylinder 1 and the piston rod 3 are A coil spring is compressed and held in a spring receiver provided in each of the fixed mounting fittings 4. A bushing rod 5 is slidably inserted into the piston rod 3, and a blow pulp 7 is attached to the tip of the bushing rod 5 via a valve spring 6. During the extension process, the blow pulp 7 is moved downward by hydraulic pressure. The actuator opens the oil passage 8, oil flows from the lower oil chamber to the upper oil chamber as shown by arrow A, and damping force is generated. The proximal end of the cut bush rod 5 is brought into contact with an oil chamber 9 provided in the metal fitting 4 in some cases, so as to receive oil pressure. On the other hand, a plunger 11 operated by a pulse motor 1O is provided outside the upper distributor cushion unit, and a fusinger piston 12 connected to the shaft of the pulse motor 10 extends in the direction of the central axis inside the case 13. It has been inserted. And this piston 12
The end of the motor is screwed into a case end 14 fixed in the case 13, and the piston 12 is rotated and moved left and right by the forward and reverse rotation of the pulse motor 10.

15 is a flexible hose such as a rubber hose, one end of which is attached to the case 13 of the plunger 11 and connected to the piston 12, and the other bent end is inserted into the hose 15 into the oil chamber 9 provided in the mounting bracket 4. The piston 12 of the plunger is connected to the oil chamber 9 through the oil (including grease).

and is transmitted to the bushing rod 5.

In addition, the change in volume with respect to the internal pressure of the rubber hose 15 is from 0 to
It changes significantly between 1 atm and above 30 atm, and is relatively stable up to 5 atm above and below 10 atm. For this reason, the oil is pressurized in advance by approximately 10 atmospheres using the pressure spring 16 via the slider 17.

In this configuration, an appropriate number of pulses are applied to the pulse motor 10 to automatically obtain an appropriate damping force, and inputs from each sensor to be described later are sent via the sensor interface 18. The damping force is input to the CPU 19, the CI'U 19 selects the damping force according to the road surface and driving conditions (input), and the necessary number of pulses are applied to the pulse motor 10 via the controller 20.

In addition, 21 is a display panel, and if necessary, input is made from a manual auto switch or a manual UP/down switch to the CPU 19 via a switch input interface 22f, and the controller 20 is controlled according to the input. A circuit may be provided to enable the operation.

Therefore, the damping force characteristic that is generally applied to the cushion is (1
), the displacement of 1d stroke becomes large on rough roads, so the damping force needs to be high; (2), on good roads, on the contrary, it is necessary to keep the damping force low. 1 de r7. (3), during deceleration and (4),
It needs to be high at high speeds, and high at (5) and sprung and unsprung resonance frequencies. Furthermore, (6) when the temperature of the oil in the cushion is low, the damping force increases, so it must be suppressed, and when it is high (d), it decreases, so it is necessary to compensate for that temperature.

This is illustrated in FIG. 2. Note that the N curve represents the damping force characteristic at the current setting (compromise line) and the expansion time of the current setting (compromise line), and the ■ curve represents the characteristic curve for the large stroke and LIfL small stroke. For a cushion having the potential shown in the shaded area, a damping curve is selected depending on the road surface, driving conditions, etc.

First of all, as a sensor for these (1), a digital sheath meter is used which has the ability to divide the total stroke into 8 or more (23) divisions for 7 strokes. Note that the reason for making it digital is that an A/D converter is not used. (2)
, For the vehicle speed, input a pulse signal that changes the vehicle speed. (3) For sudden acceleration/deceleration, use a differentiation circuit that differentiates the vehicle speed input with respect to time. (1 to 211 Hz for sprung parts, 2O-25 Hz for unsprung parts.
) For VC, the frequency is always measured by the CPU when measuring the stroke.
In the monitoring mode 2, the CPU is operated so that the damping force becomes higher than the predetermined resonance frequency VC. (
5J, Temperature fjJ=[7] The CPU is fully operated so that the damping force is low when the temperature is low and high when the temperature is high relative to the outside temperature or cushion temperature.

In this manner, in order to increase the damping force during the extension process in response to inputs from each sensor, the pulse motor 10 is rotated and the plunger piston 12 is moved to the left. Due to the movement of the piston 12, the oil in the rubber hose 15 increases the pressure in the oil chamber 9, pushing up the bushing rod 5 and applying pressure to the blow valve 7 via the valve spring 6. Therefore, during the extension process, the oil flows as shown by the arrow A Ic.
The blow valve 7 passes through the lower oil chamber/hole oil passage 8.
Press down and flow. The damping force increases because the limiting amount is reduced. -Force extension] In order to reduce the damping force at the second stage, it is sufficient to stop the pulse motor 10 from rotating in the opposite direction and IL.
It goes without saying that the present invention can be applied to all slide-type damping force variable mechanisms such as a complete set, spool type, and needle type.

As mentioned above, according to the present invention, the CPU is
Since the damping force is automatically controlled, the riding comfort can be optimized, which has the effect of b.

Figure 1 is a configuration diagram showing one embodiment of this inventive device, and the second part shows the damping force curve of N-C which explains the reason for its operation. ν
It is j.

1... Schilling - 2... Piston 3... Piston rod 4... Mounting bracket 5... Nush rod 6...
・・Valve spring 7・・Blow valve 8・・・
Oil passage 9...Oil chamber 10...Pulse motor 11
... Plunger 12 ... Piston ] 5 ... Flexible hose 18 ... Sensor human interface 19 ... CPU 20 ... Controller 21 - Display panel 22 - Switch input interface Patent applicant Showa Seisakusho Co., Ltd.

Claims (1)

[Claims] An oil chamber is provided in a mounting bracket that is fixed to the tip of the piston rod, and a bushing rod is slidably inserted into the piston rod, the proximal end surface of the bushing rod is brought into contact with the oil chamber, and pulp is attached to the other tip. In the slide-type variable damping force rear cushion unit, which opens this pulp during the elongation process, a flexible hose is connected between the oil chamber and the plunger piston operated by an externally provided pulse motor. A closed hydraulic circuit is installed, and changes in the road surface, driving conditions, and temperature are sensed by various sensors, and the controller is controlled so that the damping force is within a preset range, thereby operating the pulse motor. Features a cushion automatic damping force variable device.