JPS60226311A - Vehicle suspension device - Google Patents

Abstract

PURPOSE:To enhance the sealing ability to gas and the change ability of a spring constant, in vehicle suspension device provided therein with main and auxiliary actuators, by disposing a valve member which is driven by an output shaft disposed in the main actuator, in a gas communication passage between both actuators. CONSTITUTION:A blocking common base 25 having a gas passage 28 is welded to the top end opening of a hollow rod 10 in an main actuator 1, and gas chambers 12, 53 in main and auxiliary actuators are communicated with each other. Further, a gas shut-off mechanism 30 is disposed in the main actuator 1. This gas shut-off mechanism 30 actuates a valve member 37 by means of a motor 32 disposed in the main actuator 1 to open and close the valve so that the communication between the main and auxiliary actuators 1, 2 is opened and closed. Simultaneously, this motor 32 actuates an orifice passage adjusting mechanism 31. With this arrangement it is possible to aim at simplifying the structure and as well at reducing the number of component parts, and therefore, it is possible to enhance the sealing ability and to enhance the change-over of spring constants.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vehicle suspension system including a main actuator and a sub actuator.

[Technical background of the invention and its problems]

The patent application filed in 1982, which was previously proposed by the present inventors, describes a system in which gas and oil are housed in a cylinder so that a spring function due to the gas and a damping function due to the oil can be obtained. -176401, by providing a sub actuator separately from the main actuator, connecting the gas chamber in the main actuator and the gas chamber in the sub actuator with gas piping, and providing an on-off valve in the middle of the gas piping, it is effective. A device in which the gas chamber volume is switched in two stages to change the spring constant has also been considered. However, in this V4 construction, the on-off valve is located outside the main and sub actuators, so there are disadvantages such as special consideration must be given to sealing of the piping and the on-off valve.

Therefore, in order to solve the above-mentioned drawbacks, the present inventors considered a system in which an on-off valve and a motor were built into the main actuator, and a rotary type valve body was driven by the rotary shaft of the motor. Gas may leak between the valve body and the valve body, making it uncertain whether the gas chambers are mutually isolated)
However, there were times when the bounce constant did not change clearly.

[Purpose of the invention]

The present invention was made based on the above circumstances, and an object of the present invention is to provide a suspension system for a vehicle that has excellent gas sealing properties and can clearly change the spring constant.

[°Summary of the invention]

The gist of the present invention is to provide a cylinder having an oil chamber inside, a hollow rod telescopically inserted into the cylinder and having an oil chamber and a gas chamber inside, and a hollow rod provided in the hollow rod and connected to the cylinder. In a vehicle suspension system comprising a main actuator equipped with a damping force generation mechanism section that communicates an oil chamber with an oil chamber in a hollow loft, and a sub actuator having an internal waste chamber; a gas chamber of the main actuator; A gas passage opening/closing mechanism is provided in the gas passage section that communicates the gas chamber with the gas chamber of the sub actuator,
This gas passage opening/closing mechanism includes a valve seat and a reciprocating valve body that closes the valve port when pressed by the valve seat and opens the valve port when driven in a direction away from the valve seat. and the valve body is driven by an output shaft of a drive source built into the main actuator.

According to the above configuration, the drive source for driving the gas passage opening/closing mechanism is built into the main actuator, which is advantageous in terms of sealing measures. In addition, we adopted a reciprocating type valve body that opens the valve port by being driven away from the valve seat, so the gas sealing performance is further improved compared to a valve body that uses a rotating type valve body. , the result is that the spring constant can be clearly switched.

(Embodiment of the Invention) An embodiment of the present invention will be described below with reference to the drawings. The vehicle suspension system shown in FIG. 1 includes a main actuator 1 and a sub actuator 50.

First, the main actuator 1 will be explained. Reference numeral 2 in the figure indicates a cylinder, and a mounting portion 4 provided with a rubber bushing 3 is provided at the bottom of the cylinder 2. In this installation, the portion 4 is fixed to the wheel side.

An oil seal 5 is provided on the side. Also cylinder 2
An oil chamber 7 is formed inside.

A hollow rod 1-10 is telescopically inserted into the cylinder 2. The hollow rod 10 is provided with an oil chamber 11 therein, and a gas chamber 12 filled with high-pressure nitrogen gas above the oil chamber 11.

In addition, a flow=1- may be floated between the oil chamber 11 and the gas chamber 12. Further, a tri-bearing 14.1'5 is provided on the sliding surface of the cylinder 2 and the hollow rod 10.

Further, a damping force generating mechanism section 17 is provided at the lower part of the hollow rod 10.
is provided. The damping force generating mechanism 17 includes a disc valve 20, a relief coil spring 21, a variable orifice 22, and the like, and allows the oil chamber 7 of the cylinder and the oil chamber 11 of the hollow rod to communicate with each other. Also,
A common base 25 is airtightly attached, for example, by welding, so as to close the upper end opening of the hollow rod 10.

A cover 27 is attached to the common base 25 so as to surround the upper part of the cover 2 and the upper part of the hollow rod 10 for attachment to the vehicle body.

A gas passage portion 28 is formed in the common base 25,
The gas chamber 12 of the main actuator and the gas chamber 53 of the sub actuator described below can communicate with each other.

29 is a bump rubber.

Inside the main actuator 1, there is a gas passage opening/closing mechanism 3 for controlling the flow and interruption of the gas passage section 28.
0 is provided in the damping force generation mechanism section 17,
An orifice flow path adjustment mechanism 31 is provided.

The gas passage opening/closing mechanism 30 and the orifice flow path regulator vA31 are each controlled simultaneously by a motor 32 as an example of a drive source, as will be described in detail below. At both upper and lower ends of the motor 32,
Projecting output shafts 33, 34 rotate simultaneously with each other in the axial direction.

As shown in an enlarged view in FIG. 2, the gas passage opening/closing mechanism 30 includes a valve port 35 communicating with the gas passage portion 28, a valve seat 36 formed around the valve port 35, and a valve seat 36 formed around the valve port 35. A reciprocating valve element 3-7 that closes the valve port 35 when pressed by the valve member 36 and opens the valve port 35 by being driven away from the valve seat 36; A cam mechanism 39 converts the rotational motion of the output shaft 33 of the motor into linear motion and reciprocates the valve body 37.

The cam mechanism 39 includes a cam 39a having an inclined surface that rotates in conjunction with the output shaft 33, and a cam follower 39b that slides on the cam 39a and reciprocates in the axial direction due to the rotation of the cam 39a. Become.

As shown in FIG. 3, when the cam 39a is rotated about 90 degrees to 180 degrees from the state shown in FIG. 2, the valve port 35 is fully opened. In this way, when the valve port 35 is opened, the two gas chambers 12.53 communicate with each other, so the spring constant becomes low, and conversely, the valve port 35 is closed as shown in FIG. . Yo, □A, a. knee,. Ka, yu. □
2 o Yuka, (works independently and has a high spring constant.

Further, the other output shaft 34 of the motor 32 is connected to the orifice opening adjustment valve 4 via a hollow extension member 34a extending downward.
6. This regulating valve 46 has a communication hole 47a.
It is rotatably inserted into an annular body 47 provided with. By changing the rotational position of the regulating valve 46, the opening amount of the communication hole 47a, that is, the flow passage cross-sectional area of the variable orifice 22 changes, and the damping force changes.

Furthermore, when the regulating valve 46 is rotated in the direction of widening the orifice flow path, the valve element 37 is simultaneously driven in the direction of communicating the gas passage section 28, and conversely, the regulating valve 46 is rotated in the direction of narrowing the orifice flow channel. When the valve body 37 is rotated, the valve element 37 is simultaneously driven in a direction to close the gas passage section 28.

On the other hand, the sub actuator 50 has a bottomed cut cylinder portion 5.
1, a free piston 52 provided inside this cylinder portion 51, a gas chamber 53 and an oil chamber 54 partitioned by this free screw 52, and an oil amount control device 55 that takes oil into and out of this oil chamber 54. Consists of etc. The above cylinder part 5
The upper end surface of 1 is a lateral extension portion 25a of the common base 25.
It is airtightly attached to the lower surface of the housing, for example by welding.

56 is a seal.

The oil amount control device 55 includes a hydraulic power source 57 and a hydraulic switching valve 5.
8.59, oil tank 60, etc.

The hydraulic switching valves 58 and 59 and the motor 32 are controlled by a controller 70 such as a microcomputer. The controller 70 receives one word from, for example, a vehicle height sensor 71, a speed sensor 72, a handle sensor 73, a brake sensor 74, an accelerator sensor 75, a hand brake sensor 76, and the like.

In one embodiment of the device having the above configuration, a damping force is generated in the damping force generating mechanism section 17 by the hollow rod 10 expanding and contracting relative to the cylinder 2, and the gas chamber 12.
The repulsive force of the nitrogen gas inside 53 functions as a spring.

Further, by using the oil amount control device 55 to put oil in and out of the oil chamber 54, the elongation of the hollow rod 10 can be adjusted in accordance with changes in the amount of oil. In other words, the vehicle height can be adjusted. The vehicle height adjustment command may be automatically output by the vehicle height sensor 71 so that a constant vehicle height can be maintained at all times.
A desired vehicle height may be obtained by manually outputting a vehicle height adjustment signal by operating a manual switch (not shown).

- Also, by driving the motor 32 based on signals input from various sensors 71 to 76 and simultaneously controlling the gas passage opening/closing mechanism 30 and the orifice flow path adjustment mechanism 31, the vehicle body posture is stabilized and ride comfort is improved. It is also possible to aim for

For example, when the vehicle is running straight ahead, the valve body 37 is driven so that the valve port 35 opens to lower the spring constant, and at the same time, the flow rate of the regulating valve 46 in the orifice flow path is maximized to reduce the damping force. It can improve the feeling of millet.

In addition, when turning, suddenly accelerating, suddenly stopping, or when driving at high speed, the motor 32 is driven via the controller 70 based on the output signals from the sensors mentioned above or signals from manual operation, and the valve port 35 is closed. By increasing the spring constant and at the same time minimizing the opening amount of the regulating valve 46 of the orifice flow path to increase the damping force, it is possible to improve the steering stability.

However, according to the above embodiment device, the gas passage opening/closing ljl
! Since the mechanism 30, the orifice flow path adjustment mechanism 31, and the motor 32 that drives them are all built into the main actuator 1, excellent gas and oil sealing properties are achieved. Moreover, by adopting a reciprocating drive type valve body 37 that moves toward and away from the valve seat 36 in the axial direction as the gas passage opening/closing mechanism 30, the sealing when the valve is closed is improved compared to when a rotary type valve body is used. Due to the improved properties, the gas chamber 12.53 can be reliably partitioned, and as a result, the spring constant can be clearly switched.

Moreover, according to the above embodiment, the gas passage opening/closing mechanism 30 is operated by one motor 32 built in the main actuator 1.
Since the and orifice flow path adjustment mechanism 31 can be driven at the same time, the structure is simple and the number of parts can be reduced.

Note that a solenoid may be used as the drive source instead of the motor 32. Furthermore, the intended purpose of the present invention can be achieved even if the output shafts 33 and 34 are not limited to rotation, but can also be configured to reciprocate in the axial direction. Alternatively, the main actuator 1 and the sub actuator 50 may be separated, and the gas chamber 12 on the main actuator side and the gas chamber 53 on the sub actuator side may be communicated via gas piping.

Further, there is no problem even if the oil amount control device 55 is not provided.

〔Effect of the invention〕

As described above, according to the present invention, by improving gas sealing performance, it becomes possible to reliably partition the gas chamber of the main actuator and the gas chamber of the sub-actuator, and it is possible to clearly switch the spring constant. becomes.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a vehicle suspension system, and FIGS. 2 and 3 are sectional views of a gas passage opening/closing R structure showing mutually different valve operating states. . 1... Main actuator, 2... Cylinder, 7...
・Oil chamber, 10...Hollow rod, 11...Oil chamber, 12
... Gas chamber, 17... Damping force generation mechanism section, 28...
・Gas passage section, 30...Gas passage opening/closing mechanism, 31...
・Orifice flow path adjustment mechanism, 32...motor (drive m
'), 33.34...Output shaft, 35...Valve port, 3
6... Valve seat, 37... Valve body, 39... Cam mechanism,
5o... Sub actuator, 53... Gas chamber, 54
...Oil room. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 31

Claims (3)

[Claims] (1) A cylinder having an oil chamber inside, a hollow rod telescopically inserted into the cylinder and having an oil chamber and a gas chamber inside, and a cylinder provided in the hollow rod and connecting the oil chamber of the cylinder and the hollow rod. A main actuator is provided with a damping force generation mechanism that communicates with the oil chamber, and
In a vehicle suspension system equipped with a sub-actuator having a gas chamber inside: A gas passage opening/closing VA'W is provided in the gas passage section that communicates the gas chamber of the main actuator with the gas chamber of the sub-actuator.
4, this gas passage opening/closing mechanism includes a valve seat, and a reciprocating valve that closes the valve port by being pressed by the valve seat and opens the valve port by being driven in a direction away from the valve seat. A suspension device for an output shaft handle of a drive source built into a main actuator. (2) The output shaft of the drive source rotates in a direction around the axis, and the rotational motion is converted into linear motion via a cam 1jul to drive the valve body. The vehicle suspension system according to item (1). (3) Output shafts protrude from both sides of the drive source, one output shaft drives the valve body, and the other output shaft drives an orifice flow path adjustment mechanism provided in the damping force generation mechanism section. Claim (1) or () characterized in:
2) The vehicle suspension system described in item 2).