JPS59183135A - Engine support device - Google Patents

Abstract

PURPOSE:To control damping force at the optimum value by disposing a chamber containing a fluid in the interior of a vibration-proof rubber, connecting the chamber with an outside chamber through a plurality of orifices and opening and closing a valve fixed to one orifice. CONSTITUTION:A vibration-proof support device 4 includes a pair of plates 7, 8 having a vibration-proof rubber 9 interposed between the plates 7, 8. A concave portion 13 is disposed in the vibration-proof rubber 9, thereby forming an inner chamber. An outer chamber 14 is formed between the lower plate 8 and a bracket 10 fixed to the plate. Both chambers 13, 14 are connected to each other through orifices comprising small holes 15, 16. An opening and closing valve 17 is fixed to the orifice 16, and the opening and closing valve 17 is controlled to open and close by a solenoid coil 18. The inner chamber 13 is connected to pressurizing means through a fluid supply pipe 19 and a switch valve 20. The coil 18 and the switch valve 20 are controlled by a microcomputer 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine support device, and more particularly to an engine support device in which an engine is supported on a frame via vibration-proof rubber.

If the engine is mounted directly to the vehicle frame, engine vibrations will be transmitted to the vehicle body. Therefore, the engine has conventionally been attached to a frame via a vibration-proof support device such as a vibration-proof rubber. In order to enhance the vibration-proofing effect of this vibration-proofing support device, the spring constant of the vibration-proofing rubber can be lowered to use a softer one. Furthermore, in order to absorb engine idling vibrations, the spring constant may be lowered to lower the resonant frequency. However, if such soft anti-vibration rubber is used, the engine will displace significantly relative to the frame when the vehicle travels on rough roads, etc.
Another disadvantage is that the vibrations of the engine to the frame are not quickly damped. Furthermore, when the displacement of the vibration-proof rubber becomes large, the life of the vibration-proof rubber becomes short.

Conventionally, these factors have been comprehensively taken into consideration and a compromise has been made by setting the spring constant and damping force to average values. Therefore, it has not been possible to obtain a vibration isolating support device that has optimal characteristics for various usage conditions.

The present invention has been made in view of these problems, and it is an object of the present invention to provide an engine support device that changes at least its damping force to an optimum value depending on the usage conditions. This is the purpose.

The present invention will be explained below with reference to an illustrated embodiment.

FIG. 2 shows an engine 1 supported by a vibration isolating support device according to this embodiment, and a cylinder block constituting this engine 1 is provided with seats 2 on both sides thereof. A bracket 3 is attached to this seat 2, and a vibration isolating support device 4 is attached to this bracket 3. The lower side of the anti-vibration support device 4 is attached via a bracket 5 to a frame 6 constituting the body of an automobile. Therefore, the engine 1 is supported by the frame 6 via the anti-vibration support device 4, and the vibrations of the engine 1 are blocked by the anti-vibration support device 4 and can be prevented from being transmitted to the frame 6. It becomes possible.

Next, the structure of the anti-vibration support device 4 will be explained with reference to FIG. 2.The anti-vibration support device 4 includes a pair of plates 7.
8, and an anti-vibration rubber 9 is interposed between these plates 7 and 8.

A bracket 10 is further attached to the lower side of the plate 8, and connecting bolts 11, 12 are installed in the upper plate 7 and this bracket 10. Furthermore, the inside of the Joro self-vibration isolating rubber 9 has a concave portion 1.
3, and this recess 13 constitutes an inner chamber. On the other hand, an outer chamber 14 is formed between the lower plate 8 and the bracket 10.
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These chambers 13, 14 are filled with an incompressible fluid, such as oil, or a compressible fluid, such as air.
Small holes 15.16 formed in the rubber 9 and plate 8
They are communicated by an orifice consisting of.

And the inner and outer chambers 13 and 14 of this vibration isolation support device 4
An on-off valve 17 is attached to one of the pair of orifices 15 and 16 that communicate with each other, and the opening and closing of this on-off valve 17 is controlled by a solenoid coil 18. The inner chamber 13 is also connected to a pressurizing means (not shown) via a fluid supply pipe 19 and a switching valve 20.The solenoid coil 18 and switching valve 20 are controlled by a microcomputer 21, respectively. The microcomputer 21 is controlled by a pressure sensor 2 provided inside the inner chamber 13.
2, a vehicle speed detection sensor 23, a rotation detection sensor 241 that detects the engine rotation speed, and a frame 6 of the engine 1
The respective detection outputs of the displacement detection sensors 25 that detect displacement relative to each other are inputted.

In the above configuration, the microcomputer 21
When the on-off valve 17 is caused to close the orifice 16 by the solenoid coil 18 based on the instruction from the solenoid coil 18, the pair of chambers 13 and 14 are communicated only through the orifice 15.

Therefore, since the resistance of the fluid moving between the chambers 13, 14 increases, the damping force of this anti-vibration support device 4 increases. On the other hand, when the on-off valve 17 opens the orifice 16 based on instructions from the microcomputer 21, the vibration-proof support allows fluid to pass through both orifices 15 and 16. The damping force of the device 4 will be lower. Therefore, based on the detection by the sensors 22, 23, 24, 25, the damping force of the anti-vibration support device 4 is switched between two levels, strong and weak, by opening and closing the on-off valve 17 by the microcomputer 21 according to various conditions. It becomes possible to set the attenuation coefficient to an optimum value according to the usage conditions.

Next, when the switching valve 20 is opened based on an instruction from the microcomputer 21, fluid pressure from the pressurizing means is applied to the inside of the chamber 13 via the fluid supply pipe 19. pressure increases. Then, the resiliency constant of the vibration isolating support device 4 increases, and its resonant frequency also increases. On the other hand, when the switching valve 20 is switched by the microcomputer 21 to lower the pressure inside the chamber 13, the spring constant of the vibration isolating support device 4 decreases, and its resonance frequency also decreases. Therefore, in this case, the vibration isolating support device 4
becomes softer and its anti-vibration effect is enhanced.

Therefore, by switching the electromagnetic switching valve 20 according to instructions from the microcomputer 21 based on the detection by the sensors 23, 24, and 25, the vibration isolating support device 4 can be set to the optimum spring constant according to each usage condition. becomes intense.

As described above, according to the vibration isolating support device according to this embodiment, the damping force and the spring constant are controlled by the microcomputer 21 and the solenoid coil 18 or the electromagnetic switching valve 20.
Therefore, the durability of the vibration isolating support device 4 can be improved. Also, for the same reason, the displacement of the engine 1 with respect to the frame 6 may be reduced, or the displacement of the engine 1 with respect to the frame 6 may be reduced.
It becomes possible to quickly converge the vibrations caused by the

Roughly speaking, the vibration isolating support device 4 according to this embodiment makes it possible to effectively reduce the vibrations of the engine 1 and the muffled noise accompanying them.

Although the present invention has been described above with reference to the illustrated embodiment, the present invention is not limited to the -L embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, a pair of orifices 15.16 are provided to communicate the inner and outer chambers 13.14, and an on-off valve 17 is attached to the orifice 16, but the number of orifices is not necessarily two. Three or more orifices may be provided without limitation.

Furthermore, it is also possible to attach on-off valves to two or more orifices.

As described above, the present invention provides a chamber filled with a fluid inside a vibration-proof rubber, communicates this chamber with an external chamber through a plurality of orifices, and at least one of the plurality of orifices. This relates to an engine support device in which a valve is attached to the engine and the damping force can be varied by opening and closing the valve. Therefore, according to the present invention, it is possible to provide an engine support device that quickly converges vibrations to the engine frame by obtaining an optimal damping force depending on various usage conditions.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an engine support device according to an embodiment of the present invention, and FIG. 2 is an enlarged vertical sectional view of this engine support device. In the symbols used in the drawings, 1...Engine (cylinder block) 4...Vibration isolation support device 9...Vibration isolation rubber 13...Recess (inner chamber) 14... -Outer chambers 15, 16...Small holes (orifices) 17...Opening/closing valves 18...Solenoid coils. Applicant Hino Motors Co., Ltd.

Claims (1)

[Claims] In a device in which an engine is supported on a frame via a vibration-proofing rubber, a chamber containing a fluid is provided inside the vibration-proofing rubber, and this chamber is communicated with an external chamber through a plurality of orifices, and An engine support device characterized in that a valve is attached to at least one of the plurality of orifices, and the damping force is made variable by opening and closing the valve.