JPS60155026A - Variable damping force type shock absorber - Google Patents

Abstract

PURPOSE:To obtain always stable drive comfortability, by providing such an arrangement that the opening degree of a damper valve is variable in inverse proportion to acceleration by vibration of the lower section of a vehicle spring. CONSTITUTION:A signal from a vibration pick-up 6 attached to a lower arm 3 is delivered to a computing circuit 7 where the signal is compared with a preset vibrational acceleration so that a reversible motor 8 is driven. The motor 8 may vary the opening degree of a damper valve in a shock absorber 5. That is, by changing the opening degree of the damper valve in inverse proportion to acceleration by vibration of the lower section of a vehicle spring, a suitable vibration damping condition may be obtained.

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a shock absorber that improves riding comfort by suitably damping vehicle vibrations, and more specifically, the vibration damping rate is variable depending on the vibration situation. This invention relates to a lock absorber that is designed to

(Background of the Invention) As is known, the damping force of the 7-day Tsuku absorber, which is inserted between the curves of the upper and lower parts of a vehicle to damp the vibrations of the lower part of the spring and transmit them from the upper part to the upper part of the spring, is known. There has been proposed a system in which vibration damping is switched to obtain preferable vibration damping on a rough road with severe unevenness and on a road surface with a smooth surface.

A common method for changing the damping force is to use a damping valve (ORIICE or proportional valve, 2 conical valves) that communicates between the upper and lower oil chambers for cylindrical shock absorbers (hereinafter referred to as ``shirotsuk absorbers''). etc.), and the damping valve can be an externally adjustable mechanism that can be switched directly or by remote control. Furthermore, in addition to those that manually vary the damping force, there are also systems that automatically vary the damping force in accordance with the size of the stroke of the lock absorber.

However, the conventional damping force variable system of the shock absorber has the disadvantage that control is performed in stages and is not linked to vibration acceleration, which directly corresponds to riding comfort.

(Object of the Invention) In view of the above points, the present invention provides a variable damping force type shock that varies the damping force of a shock absorber in accordance with the vibration situation when the vehicle is running, so that a stable riding comfort can always be obtained. The purpose is to provide absorbers.

(Summary of the Invention) In order to achieve the above-mentioned object, the wall mount of the present invention is installed between a sprung upper part and a sprung lower part of a vehicle, and circulates oil in the upper and lower internal oil chambers through damping valves to reduce vibrations. A cylindrical shock absorber for damping the damping valve is provided with an opening adjustment function for adjusting the opening of the damping valve in conjunction with a forward and reverse rotation motor, and a photographic pickup for detecting vibrations of the lower part of the spring, The damping rate variable shock absorber is characterized in that the normal/reverse rotating motor is configured to vary the opening degree of the damping valve in inverse proportion to the vibration acceleration value detected from the vibration pickup.

(Embodiment of the invention and its effects) The drawings show an embodiment of the present invention, and in FIG. There is. 2 is a wheel, a lower arm that supports three wheels, and a shock absorber 5
The lower end of is reprinted. Reference numeral 4 denotes a suspension spring that is mounted on the shock absorber 5 and connects and supports the sprung upper and lower parts.

Reference numeral 6 is a vibration pickup attached to the lower arm 4, and simply, it may be of a type in which an approximate stationary point is provided inside the pickup by a pendulum string and movement relative to this is detected. The signal obtained from the vibration pickup 6 is transmitted to the arithmetic circuit 7, where it is compared with a preset vibration acceleration to drive and control the forward and reverse rotation motor 8.

FIG. 2 shows the internal structure of the shock absorber 5 and the state in which the damping force of the 7-day shock absorber 5 is varied by the forward and reverse rotation motor 8. The shock absorber of this example has a cylindrical body. 9 is connected to the lower side of the spring, and a rod 11 integral with the piston 10 is connected to the upper and lower sides of the spring, and the male stone 10 is formed with a first orifice 12, 12 having a cross-sectional area of a constant opening degree. 11 is provided with a second orifice 13 which is provided with an opening adjustment function, and in particular, this latter second orifice 13 has a vertical hole extending in the axial direction with respect to the rod and a horizontal hole extending in the axial direction. The adjustment seal 14 moves in the axial direction in the axial direction of the horizontal hole, but the horizontal hole opens into the id hole 16. The idle hole 16 penetrates to the upper end of the piston rod 11, and the adjuster rod 15 having the adjuster seal 14 integrated at the lower end protrudes from the upper end of the wrong rod 11. It is provided so that it can be moved up and down by a mechanism or the like.

The adjuster seal 14 is movable relative to the horizontal hole of the second orifice 13 to change its communication state (that is, the opening degree).

With the above configuration, the upper oil chamber A and the lower oil chamber B inside the shock absorber 5 are communicated with each other through the first orifice 12 and the second orifice 13, and the cross-sectional area of the former orifice is
Ll, and if the cross-sectional area of the latter orifice is a2, the oil flow path of the latter can be changed in the range of 0 to a2 by the adjuster seal 14, so the opening degree of the entire orifice is a.
, to (a 1 + a 2 ).

FIG. 2(b) shows the state in which the second orifice 13 is closed and the opening degree is the minimum, and FIG. 2(c) shows the state in which the adjuster seal 14 is pulled upward and the second orifice 13 is half open. It shows. If the adjuster seal 14 is further pulled upward, the second orifice 13 will be fully opened, and if the adjuster seal 14 is moved downward, the second orifice 13 will be closed again. The upward and downward movements of the adjuster seal 14 are caused by the clockwise and counterclockwise rotations of the forward and reverse rotation motor 8 shown in FIG.
6) It is done.

FIG. 3 is a block diagram showing the control procedure for adjusting the opening of the shock absorber 5 configured as described above, in which the vibration acceleration detected by the vibration pickup 6 is set in advance by the arithmetic circuit 7. Compared to the vibration acceleration, it is preferable to reduce the opening of the orifice to increase the damping force on rough roads with large irregularities on the road surface, and to increase the damping force by increasing the opening of the orifice when the road surface has few irregularities. This is to obtain a vibration damping state.

Note that it is preferable to control the orifice opening in inverse proportion to the vibration acceleration by, for example, driving the normal/reverse rotating motor according to the relationship between the acceleration value and the orifice once distributed to the microprocessor in advance.

(Effects of the Invention) As described above, according to the variable damping force type shock absorber of the present invention, a stable ride comfort is always automatically obtained when the vehicle is running, and its practical use-F. Sex is very much a dog.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention.
The figure shows how the shock absorber is installed, Figure 2 (
A), (B), and (C) are diagrams showing the internal structure of the shock absorber and the state of adjustment of the orifice opening, and FIG. 3 is a block diagram showing the procedure for adjusting the opening. 1... Spring upper part 2... Wheel 3... Lower arm 4... Suspension spring 5... Shock absorber 6... Vibration pickup 7... Arithmetic circuit 8... Forward/reverse rotation motor 9 ...Cylinder body 10・
...Piston 11...Piston rod 12...1st, t I
J Fitting 13...Second orifice 14...Adjusting seal 15...Adjusting rod 16...
Guide hole (9)

Claims (1)

[Claims] In a cylindrical shock absorber that is installed between a sprung upper part and a sprung lower part of a vehicle and damps vibration by circulating oil in upper and lower internal oil chambers through a damping valve, the opening degree of the damping valve is adjusted to
An opening adjustment mechanism that adjusts in conjunction with a reverse rotation motor and a vibration pickup that detects vibrations of the lower part of the spring are provided, and the pressure/reverse rotation motor is adjusted in conjunction with a vibration acceleration value detected by the vibration pickup. A variable damping ratio shock absorber, characterized in that the opening degree of the damping valve is varied inversely proportionally.