JPH037205Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a structure for attaching a panhard rod in a link type suspension of an automobile to the vehicle body side or the wheel side.

(Prior art) The conventional Panhard rod mounting structure is described in "Automotive Engineering Complete Book Vol. 11 "Steering, Suspension" published by Sankaido Co., Ltd. on August 20, 1981.
There are some as described on pages 98 and 60. That is, this conventional panhard rod is illustrated in FIG. 6, in which rubber bushes 2 are fixed to both ends of the panhard rod 1. Both rubber bushes 2 each include an outer cylinder 3 fixed to the panhard rod 1, an inner cylinder 4 fixed to the vehicle body side or the wheel side, and a rubber 5 interposed and fixed between the outer cylinder 3 and the inner cylinder 4. Then, one rubber button 2
The inner cylinder 4 of the rubber bush 2 is fixed to the vehicle body side, and the inner cylinder 4 of the other rubber bush 2 is fixed to the wheel side.

The Panhard rod 1 is installed between the vehicle body and the wheels so as to extend in the direction of the axle, and is provided with lateral rigidity to support the lateral load between the vehicle body and the wheels. Further, the longitudinal load between the vehicle body and the wheels is supported by an upper link and lower link (not shown), and the vertical load is supported by a coil spring.

(Problem that the invention attempts to solve) However, in such conventional examples,
The length of the upper link, the lower link, and the Panhard rod 1, the mounting position on the wheel side, and the mounting position on the vehicle body are all different, and the extending direction of the Panhard rod 1 and both links is completely opposite, so only the Panhard rod 1 is used. When the movement of the wheels relative to the car body when the car body side and the wheel side are connected by a link does not match the movement of the wheels with respect to the car body when the car body side and the wheel side are connected only by both links. There is. This phenomenon does not occur when the left and right sides of the axle move up and down in the same phase, but it occurs when the left and right sides of the axle move up and down in different phases, that is, when the vehicle body rolls. Therefore, when the axle is supported by the Panhard rod 1 and both links, the movement of the axle becomes locked by both the links and the Panhard rod 1, and the smoothness of the movement decreases. As the roll angle increases, roll stiffness increases.

By the way, on good roads, it is desirable for automobiles to have high roll stiffness in order to ensure steering stability, and on rough roads, it is desirable to have small roll stiffness in order to improve the ground contact of the wheels. However, in the conventional example, since the roll stiffness increases at a certain angle, there is a problem in that the ground contact of the wheels on rough roads is not sufficient.

The present invention was developed by focusing on the problems of the conventional method, and the purpose is to make it possible to change the roll rigidity to adapt to the running conditions by using the mounting structure of the Panhard rod. It is said that

[Structure of the idea]

(Means for Solving the Problems) In order to solve the problems of the conventional example, the present invention provides a rubber bush that connects the end of the Panhard rod to the vehicle body side or the wheel side. Internal fluid chambers are provided separately on the side and the far side, and an open state that allows fluid to flow in both directions and a shield between the two internal fluid chambers or between both internal fluid chambers and an external fluid chamber provided outside. They are connected via an on-off valve that can be switched between a closed state and a closed state, and this on-off valve is provided with an on-off operation means.

(Function) When the opening/closing valve is opened by operating the opening/closing operation means and the two internal fluid chambers are communicated with each other or both the internal fluid chambers and the external fluid chamber are communicated with each other, the internal fluid chamber and the external fluid chamber are opened and closed. Since fluid can freely move between the internal fluid chamber or the external fluid chamber that communicates through the valve, the internal fluid chamber can freely deform as the rubber deforms. Therefore, since the fluid in the internal fluid chamber does not affect the deformation of the rubber, the rubber is interposed between the Panhard rod and the vehicle body side or the wheel side with its own spring constant. Therefore, the Panhard rod is supported with low rigidity in the axial direction, making it easy to move in the lateral direction between the vehicle body side and the wheel side. Therefore, the restraining force between the vehicle body side and the wheel side due to the Panhard rod is reduced. Therefore, in this case, since the influence of the Panhard rod is reduced, the wheel side is supported mainly by the upper link and the lower link. Thus, in this case, the roll stiffness is reduced, so the ground contact performance of the wheels is improved, and the road surface followability of the wheels on rough roads is increased.

In addition, when the on-off valve is closed by operating the on-off operation means to shut off the connection between both internal fluid chambers or between both internal fluid chambers and the external fluid chamber, the fluid is restricted within the internal fluid chamber. The volume of the fluid chamber cannot be changed. Therefore, the deformation of the rubber is suppressed, and the spring constant of the rubber is increased, so that the Panhard rod is held in a state of high rigidity in the axial direction. Therefore, the vehicle body side and the wheel side are rigidly connected by Panhard rods,
The restraining force between the vehicle body side and the wheel side due to the Panhard rod is improved. Therefore, in this case, since the influence of the Panhard rod increases, the wheel side is supported not only by the upper link and the lower link but also by the Panhard rod. Thus, in this case, the roll rigidity is improved, so the steering stability during cornering on a good road is improved.

Thus, by opening and closing the on-off valve, the roll stiffness of the vehicle can be changed to suit the driving conditions.

(Example) Figures 1 to 3 are diagrams showing a first example of the present invention. In FIG. 3, 6 is an axle, and wheels (not shown) are arranged at both ends of the axle. 7 is an upper link, 8 is a lower link, 9 is a stabilizer, 10 is a coil spring, 11 is a shock absorber,
Reference numeral 1 denotes Panhard rods by which the axle 6 is suspended on the vehicle body, forming a five-link type rear suspension.

As shown in FIGS. 1 and 2, a rubber bush 2 is fixed to one end of the panhard rod 1. This rubber bush 2 is for connecting the end of the panhard rod 1 and a bracket 12 fixed to the vehicle body, and is used to connect an outer cylinder 3 fixed to the panhard rod 1,
The bracket 12 includes an inner cylinder 4 fixed to the bracket 12 with bolts 13 and nuts 14, and a rubber 5 interposed between the outer cylinder 3 and the inner cylinder 4.

Two internal fluid chambers 15 and 16 are formed in the rubber 5. The internal fluid chambers 15 and 16 are connected to the Panhard rod 1 through the center of the rubber 5 (the center of the rubber bushing 2).
are placed separately on the near and far sides. Both internal fluid chambers 15 and 16 communicate with each other via an on-off valve 17 that can be switched between an open state where fluid flows in both directions and a closed state where fluid is blocked. , 16 communicate with each other, and in the closed state, the two are cut off.

The on-off valve 17 of this embodiment has a valve hole 17d between the first chamber 17b and the second chamber 17c in the valve body 17a.
A screw rod 17f is screwed onto the valve body 17a and rotated by the handle 17e.
An opening/closing member 17g is formed which opens and closes the valve hole 17d by advancing and retracting the valve 7f. Then, the internal fluid chamber 15 is connected to the first chamber 17b of the on-off valve 17 through a throttle 18.
The internal fluid chamber 16 communicates with the second chamber 17 through
It is connected to c.

The screw rod 17f and the handle 17e constitute a main stage for opening and closing the on-off valve 17.

It goes without saying that the internal fluid chambers 15 and 16, the on-off valve 17, and the communication pipes thereof are filled with fluid.

When driving on a good road, the handle 17e is rotated to rotate the screw rod 17f and move the opening/closing member 17g forward, thereby opening the valve hole 17 with the opening/closing member 17g.
Close d. This is the operation to close the on-off valve 17. Then, since the internal fluid chambers 15 and 16 are cut off, the fluid in the internal fluid chambers 15 and 16 is confined there. Therefore, since the volumes of the internal fluid chambers 15 and 16 do not change, elastic deformation of the rubber 5 is suppressed, and its spring constant is substantially increased. Therefore, the vehicle body side and the wheel side come close to being rigidly connected by the panhard rod 1, and the restraint force between the vehicle body side and the wheel side by the panhard rod 1 is improved. Therefore, in this case, the influence of the Panhard rod 1 increases, so that the wheel side is supported not only by the upper link 7 and the lower link 8 but also by the Panhard rod 1. Thus, in this case, the roll rigidity of the automobile is improved, so the steering stability during cornering on a good road is improved.

Further, when driving on a rough road, the on-off valve 17 is opened. That is, the valve hole 17d is opened by rotating the screw rod 17f in the opposite direction using the handle 17e to move the opening/closing member 17g away from the valve hole 17d. Then, since the first chamber 17b and the second chamber 17c communicate with each other, the internal fluid chambers 15 and 16 communicate with each other. Therefore, when the rubber 5 receives input in the axial direction of the Panhard rod 1, a phenomenon in which one of the internal fluid chambers 15 and 16 collapses and the other swells occurs alternately between the two chambers.
At this time, fluid moves between the internal fluid chambers 15 and 16. Therefore, the rubber 5 can be deformed by its own spring constant without being affected by the fluid, and therefore its elastic deformation becomes easy.
The spring constant of the rubber 5 is substantially reduced. Therefore, lateral movement between the vehicle body side and the wheel side becomes easy, and the restraining force between the vehicle body side and the wheel side by the Panhard rod 1 is reduced. Therefore, in this case, since the influence of the Panhard rod 1 is reduced, the wheel side is mainly supported by the upper link 7 and the lower link 8. Thus, in this case, the roll stiffness is reduced, so the ground contact performance of the wheels is improved, and the road surface followability of the wheels on rough roads is increased.

The vibration input from the Panhard rod 1 is applied to the aperture 1.
8. In addition, when it is desired to set the spring constant of the rubber 5 between the above two, the valve hole 17d
By adjusting the opening degree with the opening/closing member 17g,
It can be set steplessly.

In addition, in this example, Panhard rod 1
I explained about the rubber button 2 on the car body side.
Of course, it may be applied to the rubber bushing on the wheel side instead of or in addition to this.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, the rubber bush 2 is the same as the first embodiment, but a 2-port, 2-position electromagnetic valve 17 is used as an on-off valve 17 that can be switched between an open state that allows fluid to flow in both directions and a closed state that blocks it. An on-off valve is used, and a manual switch 19 installed on the driver's seat or the like and a relay circuit 20 are connected in parallel to switch the valve. The on-off valve 17 is closed when the manual switch 19 or the relay circuit 20 is in the on state, and opened when the manual switch 19 or the relay circuit 20 is in the off state. The relay circuit 20 is configured to be switched by a controller 23 that is activated based on the detection of the driving state by a vehicle speed sensor 21 and a lateral force sensor 22. The relay circuit 20 is turned on when driving on a good road, and is turned on when driving on a rough road. It is set to turn off when driving.

Therefore, when traveling on a good road and when traveling on a bad road, the sensors 21 and 22 detect this, and the controller 2
3, the relay circuit 20 switches the on-off valve 17, or the manual switch 19 switches the on-off valve 17. By switching the on-off valve 17, communication between the internal fluid chambers 15 and 16 is established or disconnected, and the roll rigidity of the vehicle changes in accordance with the running state, as in the first embodiment.

An electric circuit for switching the on-off valve 17 constitutes an on-off valve operating means.

FIG. 5 shows a third embodiment of the present invention. That is, in the first and second embodiments, the internal fluid chamber 1
5 and 16 communicate with each other via an on-off valve 17, but in this embodiment, the internal fluid chambers 15 and 16 are in an open state in which fluid flows in both directions to the external fluid chamber 24, and in a closed state in which they are shielded. They communicate with each other through separate switchable on-off valves 17h and 17i.
The on-off valves 17h and 17i have the same function as the on-off valve 17, and include a manual switch 19 or a relay circuit 20 that opens and closes them at the same time, as well as both sensors 21 and 22 and a controller 23.
This is also the same as in the second embodiment.

Thus, in this embodiment, the internal fluid chamber 15,1
The fluid 6 moves between the external fluid chamber 24, and when the on-off valves 17h and 17i are open, the fluid moves between the internal fluid chambers 15 and 16 and the external fluid chamber 24. The direction is reversed, and the phenomenon of volume change of the internal fluid chambers 15 and 16 itself is the same as that of the first and second
It will be the same as the example.

Further, when the on-off valves 17h and 17i are in the closed state, both the internal fluid chambers 15 and 16 are closed, which is also the same as in the previous embodiment. Note that the external fluid chamber 24
may be divided into two parts and communicated with the internal fluid chambers 15 and 16 separately. An electric circuit for switching the on-off valves 17h and 17i constitutes means for opening and closing these valves.

Note that in each of the above embodiments, the on-off valve 17 is located outside the rubber bushing 2;
In the first and second embodiments, the on-off valve 17 may be located inside the rubber 5, the outer cylinder 3, the inner cylinder 4, or the bolt 13.

[Effect of idea]

As explained above, according to the present invention, internal fluid chambers are separately provided on the rubber of the rubber bushing that connects the end of the panhard rod to the vehicle body side or the wheel side, on the side closer to the panhard rod and the side farther from the panhard rod with the center in between. The internal fluid chambers or both internal fluid chambers and an external fluid chamber provided outside are connected via an on-off valve that can be switched between an open state that allows fluid to flow in both directions and a closed state that blocks it. Since this on-off valve is provided with an on-off operation means, both internal fluid chambers are closed by the on-off valve that is opened and closed by the operation of the on-off operation means, thereby substantially improving the rigidity of the rubber bushing and improving the performance of automobiles. This improves the roll rigidity of the vehicle, thereby improving steering stability when driving on smooth roads. On the other hand, by opening the on-off valve and releasing the blockage of both internal fluid chambers by the operating means, the substantial stiffness of the rubber bushing is reduced, and the roll stiffness of the automobile is reduced. Therefore, the ground contact performance of the wheels on rough roads is improved, and the road followability of the wheels on rough roads is increased.

By opening and closing the on-off valve using the opening/closing operation means in accordance with the driving conditions of the automobile, suspension characteristics corresponding to the driving conditions can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an enlarged plan sectional view of main parts showing the first embodiment of the present invention, Fig. 2 is a front sectional view of the same, Fig. 3 is a perspective view of a suspension to which the present invention is applied, and Fig. 4 is a second embodiment of the suspension.
FIG. 5 is an enlarged plan sectional view of the main part of the third embodiment, and FIG. 6 is a front view of a conventional panhard rod mounting structure. 1...Panhard Rod, 2...Rubber Button,
3...Outer cylinder, 4...Inner cylinder, 5...Rubber, 6...Axle, 7...Atsupa link, 8...Lower link, 9
...Stabilizer, 10...Coil spring, 11...
...Shock absorber, 12...Bracket, 1
3... Bolt, 15, 16... Internal fluid chamber, 17
...Opening/closing valve, 24...External fluid chamber.

Claims (1)

[Scope of utility model registration request] Internal fluid chambers are provided separately on the side nearer and farther from the panhard rod across the center of the rubber of the rubber bushing that connects the end of the panhard rod to the vehicle body side or the wheel side. The device is connected to an external fluid chamber provided outside through an on-off valve that can be switched between an open state that allows fluid to flow in both directions and a closed state that blocks it, and this on-off valve is provided with an on-off operation means. The mounting structure of the Panhard rod is characterized by: