JPS631072Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration isolating rubber device, and particularly to a vibration isolating rubber device for engine mounting used to mount an engine to a vehicle body of a vehicle such as an automobile.

Engines in vehicles such as automobiles are generally
It is elastically supported from the vehicle body via a vibration isolating rubber device to prevent engine vibrations from being transmitted to the vehicle body.

In order to effectively damp engine vibrations, it is preferable that the anti-vibration rubber device is configured to exhibit high damping performance against low-frequency vibrations and a small dynamic spring constant against high-frequency vibrations. . However, if the dynamic spring constant of the anti-vibration rubber device is small and the rigidity of the engine roll is low, the engine will swing significantly relative to the vehicle body when cranking or stopping the engine, and vibration damping will not be sufficient, causing the engine to vibrate. is transmitted to the vehicle body, significantly deteriorating ride comfort.

This invention is a new anti-vibration system that can variably set the damping coefficient and dynamic spring constant, thereby effectively damping engine vibration not only during normal engine operation, but also during engine cranking and when the engine is stopped. The purpose is to provide rubber equipment.

According to the present invention, this object is achieved by a rubber vibration-proof device having two frames, an annular wall element made of a rubber-like elastic material extending between the two frames to connect them and to define a chamber space in cooperation with the frames, a first throttle passage through which fluid flows in and out of the chamber space, a second throttle passage provided in parallel to the first throttle passage through which fluid flows in and out of the chamber space, a throttle control valve for controlling the effective passage cross-sectional area of the second throttle passage, a valve drive device for driving the throttle control valve to open and close, and terminal means for applying control energy to the valve drive device.

According to such a configuration, control energy is applied to the terminal means by an appropriate control device according to the operating state of the engine, in other words, the frequency of the vibration source, so that the valve drive device is actuated and the throttle control valve is actuated. is moved to control the size of the effective passage cross-sectional area of the second throttle passage, whereby the damping coefficient and dynamic spring constant of the vibration isolating rubber device are variably set as appropriate in accordance with the vibration of the vibration source, Effective vibration damping effects can be obtained over a wide frequency range.

In the anti-vibration rubber device according to the present invention, the maximum dynamic spring constant and viscous damping effect are obtained when the second throttle passage is completely closed by the throttle control valve and only the first throttle passage is connected to the room space. This is the time when fluid is allowed to enter and exit, and the dynamic spring constant and damping coefficient at this time are precisely determined by the downward cross-sectional area and passage length of the normally open first throttle passage. A large vibration damping effect can be obtained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of a vibration-proof rubber device according to the present invention. In FIG. 1, 1 and 2 each indicate a frame. The frame 1 is composed of a single flat plate member, and the frame 2 is composed of an assembly of a single flat plate member 2a and a bowl-shaped member 2b having a hole 2c in the center. The frame 1 and the bowl-shaped member 2b are connected to each other by an annular wall element 3 made of a rubber-like elastic material such as rubber or rubber-like material.

One end of a rod member 4 is attached to the frame 1. The rod member 4 hangs down from the frame 1 within the annular wall element 3, extends into the bowl-shaped member 2b through the hole 2c, and carries the plate-like member 5 at its tip. This plate-like member 5 is connected to the inner peripheral surface of the bowl-shaped member 2b by a rubber-like elastic membrane 6 made of rubber or rubber-like material at its outer peripheral portion, and has chamber spaces 7 and 8 on both sides thereof. is defined. The plate member 5 is provided with two throttle passages 9 and 10. Although the throttle passage (first throttle passage) 9 is always open, the throttle passage (second throttle passage) 10 is selectively opened and closed by a valve element 11 serving as a throttle control valve.

The valve element 11 is driven by a spring 12 and a solenoid 13 as a valve driving device.
When the solenoid 3 is not energized, the spring force of the spring 12 closes the throttle passage 10 in the position shown in the figure, whereas when the solenoid 13 is energized, it resists the spring force of the spring 12. and moves to the right in the figure to open the throttle passage 10.

The mounting bolts 14 attached to the rod member 4 and the frame body 1 are each hollow, and the lead wire 15 of the solenoid 13 is passed through the hollow portion, and the lead wire 15 is extended to the outside through the hollow portion. It is connected to a control unit 17 through a connection terminal 16, and can be selectively supplied with a current as control energy by the control unit 17. The control unit 17 is sensitive to the operating state of a vibration source, such as an engine, and supplies current to the connection terminal 16 during engine operation, except during engine cranking.

Therefore, during normal engine operation except during engine cranking, throttle passages 9 and 10 are both open, providing an appropriate damping coefficient and low dynamic spring constant, thereby effectively reducing engine vibration. It is damped, achieving both quietness and ride comfort. During engine cranking and when the engine is stopped, the throttle passage 10 is closed and only the throttle passage 9 is open, which increases the damping coefficient and dynamic spring constant.
As a result, the engine vibration at this time is effectively damped, and the vibration transmission rate from the engine to the vehicle body is reduced. The damping coefficient and dynamic spring constant when the throttle passage 10 is closed are set with high accuracy based on the constant cross-sectional area and passage length of the throttle passage 9.

FIG. 2 shows another embodiment of the vibration isolating rubber device according to the present invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. In such embodiments,
A valve rod 18 as a throttle control valve is rotatably attached to a linear hollow part provided in the rod member 4, the mounting bolt 14, and the plate member 5, and a small hole 19 provided in this valve rod 18 and a A small hole 20 provided in the member 4 constitutes a throttle passage (first throttle passage) that can be opened and closed. That is, when the small holes 19 and 20 are aligned, the chamber spaces 7 and 8 communicate through these small holes, whereas when the valve rod 18 rotates and the hole 19 moves away from the small hole 20, the chamber spaces 7 and 8 communicate with each other through the small holes. Communication between the chamber spaces through the small holes is blocked. The valve rod 18 is connected to a rotary actuator 21, such as a small electric motor, as a valve driving device attached to the tip of the mounting bolt 14, and the small hole 19 is connected to the small hole 20 by the rotary actuator.
The small hole 19 is rotated between a position aligned with the small hole 20 and a position where the small hole 19 is separated from the small hole 20.
The rotary actuator 21 is connected by a connection terminal 16 to a control unit 17 from which it can receive control signals, ie electrical signals.

In this embodiment as well, the damping coefficient and the dynamic spring constant change due to communication and interruption between the small holes 19 and 20, as in the above-mentioned embodiment, and when the communication between the small holes 19 and 20 is interrupted, the diaphragm changes. The constant cross-sectional area of the passage 9 and the passage length determine the damping coefficient and the dynamic spring constant, producing the same effect as in the embodiment described above.

Although the present invention has been described above in detail with reference to specific embodiments, it is understood that the present invention is not limited to these and that various embodiments are possible within the scope of the present invention. This will be obvious to businesses.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the vibration-proof rubber device according to the present invention, FIG. 2 is a vertical cross-sectional view showing another embodiment of the vibration-proof rubber device according to the present invention, and FIG. FIG. 3 is a fragmentary sectional view showing an enlarged main part of the vibration isolating rubber device shown in FIG. 2; DESCRIPTION OF SYMBOLS 1, 2... Frame body, 3... Annular wall element, 4... Rod member, 5... Plate member, 6... Rubber-like elastic membrane, 7, 8... Room space, 9, 10... throttle passage,
11...Valve element, 12...Spring, 13...Solenoid, 14...Mounting bolt, 15...Lead wire,
16... Connection terminal, 17... Control unit, 18
... Valve rod, 19, 20 ... Small hole, 21 ... Rotary actuator.

Claims (1)

[Scope of utility model registration request] two frames, an annular wall element made of rubber-like elastic material extending between the two frames to connect them and working together with the frames to define a room space; A first throttle passage that allows fluid to enter and exit, a second throttle passage that is provided in parallel with the first throttle passage and that allows fluid to enter and exit the chamber space, and an effective passage cross-sectional area of the second throttle passage. A vibration isolating rubber device comprising: a throttle control valve for controlling the throttle control valve; a valve driving device for driving the opening and closing of the throttle control valve; and terminal means for supplying control energy to the valve driving device.