JPS6324004Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vibration absorbing device that is provided between a power device such as an automobile engine and a vehicle body frame to absorb vibrations generated by the power device.

In order to balance the idling vibration (high vibration frequency, small amplitude), which is an important issue for car ride comfort, and the shock (low vibration frequency, large amplitude) generated by torque reaction force during acceleration and deceleration, we have traditionally developed a system between the engine and the vehicle body. 1st between
As shown in the figure, a vibration absorbing member with nonlinear spring characteristics is provided. As shown in Fig. 2, this vibration absorbing member has a double tube structure consisting of an inner tube a and an outer tube b, and a plate-shaped rubber c is installed between the inner tube a and the outer tube b. There is. The inner cylinder a is fixed to the engine side, the outer cylinder b is fixed to the vehicle body side, and the vibrations are absorbed by the rubber c.
For engines that generate large torque, such as large engines, shock cannot be absorbed by rubber alone. In order to solve this problem, as shown in FIG. 3, liquid chambers f and g are formed by upper mount rubber d and lower mount rubber e,
There is also an orifice h installed between these liquid chambers f and g, with i fixed to the vehicle body side and j fixed to the engine side, but this uses the damping force generated when the liquid passes through the orifice h. When a large amplitude occurs, a damping force is generated by the action of the orifice, but when a small displacement occurs, the liquid does not pass through due to the flow path resistance of the orifice h, and the spring constant becomes large. Therefore, the vibration transmission force becomes large.

This idea was devised by paying attention to the above circumstances, and its purpose is to detect the accelerator opening, engine speed, vehicle speed, clutch engagement speed, neutral position, etc. using a sensor, and to collect data from this sensor. The present invention attempts to provide a vibration absorbing device that can absorb torque depending on the magnitude of the torque by controlling the rotational drive source using a detection signal to adjust the opening degree of the orifice.

This invention will be explained below based on an embodiment shown in the drawings. 4 and 5 show the state in which the power unit 2 is mounted on the vehicle body frame 1. FIG. The power plant 2 consists of an engine body 3, a clutch housing 4, and a transmission housing 5. The engine body 3 includes a first and a second transmission housing.
and third vibration absorbers 6, 7, 8, and a fourth vibration absorber 9 is provided in the transmission housing 5. And the power unit 2
are attached to the vehicle body frame 1 by first to fourth vibration absorbers 6 to 9, and damp the vibrations of the power plant 2 to reduce the force transmitted to the vehicle body frame 1.

Since the first to fourth vibration absorbers 6 to 9 have the same structure, one of them will be explained.
It is constructed as shown in Figures 1 to 10.
That is, 10 is a casing attached to the vehicle body frame 1, and inside this casing 10 is a partition plate 1.
1 into an upper liquid chamber 12 and a lower liquid chamber 13. A liquid 14 is stored in each of the upper liquid chamber 12 and the lower liquid chamber 13, and this liquid 14 is absorbed by an elastic body such as a rubber seat 15 in the upper liquid chamber 12 and a diaphragm 16 in the lower liquid chamber 13. sealed in a liquid-tight manner. Further, the rubber seat 15 has a rubber stopper 17 projecting upward.
is integrally provided, and is configured to oppose the top plate portion 18 of the casing 10 to regulate the amount of movement of the rubber seat 15. Furthermore, this rubber seat 15
A support shaft 19 is provided that projects upward, and this support shaft 19 passes through a through hole 20 formed in the top plate portion 18 of the casing 10, projects to the top of the casing 10, and is fixed to the power unit 2. ing. A pedestal 21 is attached to the tip of this support shaft 19, and the top plate portion 1 of the casing 10 is attached to the bottom surface of this pedestal 21.
A rubber stopper 22 is bonded opposite to the rubber stopper 8 for regulating the amount of movement of the base 21.

Further, an orifice 23 consisting of a long hole for communicating the upper liquid chamber 12 and the lower liquid chamber 13 is bored in the partition plate 11 in the thickness direction. As shown in FIGS. 8 and 9, this orifice 23 is bent into a crank-shaped cross section, and a bearing hole 24 is bored in the bent portion extending in the longitudinal direction of the partition plate 11. A rotary spool 25 is rotatably inserted into this bearing hole 24. The shaft of the rotating spool 25 is formed as a valve portion 26 that opens and closes the orifice 23.
is provided with a large passage 27 having an L-shaped cross section and a small passage 28 communicating with the large passage 27, the opening ends of which are biased by 90 degrees in the circumferential direction of the shaft portion to selectively connect with the orifice 23. We are now able to face each other.
The valve portion 26 is adapted to switch the orifice 23 into three stages: closed, wide open, and small open. Furthermore, one end of the rotary spool 25 projects outward from the end of the partition plate 11, and is connected to a rotational drive source, such as a rotary solenoid 29, to this projecting part. The rotary solenoid 29 is electrically connected to a sensor 33 via a control circuit 32 consisting of a solenoid drive circuit 30 and a logic controller 31. This sensor 33 consists of a throttle sensor, an engine pulse sensor, a vehicle speed sensor, a neutral sensor, and a clutch sensor. These sensors detect torque reaction force, and the control circuit is controlled based on the detection signal, that is, the magnitude of the torque reaction force. 32 controls a rotary solenoid 29 to adjust the opening degree of the orifice 23 of the partition plate 11.

However, since a large torque reaction force is not generated during idle vibration (high frequency, small amplitude), such as when running at low speed or at high speed and high rotation, the control circuit 32 drives the rotary solenoid 29 based on the input signal from the sensor 33. The rotating spool 25 is rotated to move the orifice 23 into the large passage 27 as shown in FIG. 9A.
communicate via. Therefore, vibrations from the power unit 2 that are transmitted to the support shaft 19 are absorbed by the rubber seat 15. Furthermore, when the rubber seat 15 is elastically deformed downward, the liquid 14 in the upper liquid chamber 12 is guided to the lower liquid chamber 13 via the orifice 23.
When elastically deformed upward, the liquid 1 in the lower liquid chamber 13
4 is led to the upper liquid chamber 12 via the orifice 23. Therefore, vibrations applied to the support shaft 19 are attenuated when the liquid 14 passes through the orifice 23, and vibrations transmitted to the vehicle body frame 1 via the casing 10 can be reduced.

Further, since a large torque reaction force is generated during a shock (low vibration frequency, large amplitude), for example, during acceleration/deceleration or sudden engagement of the clutch, the sensor 33 detects this and inputs a detection signal to the control circuit 32. Therefore,
The control circuit 32 drives the rotary solenoid 29 to rotate the spool 25 and communicate the orifice 23 through the small passage 28 as shown in FIG. 9B. Therefore, the vibrations from the power unit 2 that are transmitted to the support shaft 19 are transmitted to the rubber seat 15, causing it to be largely elastically deformed. Therefore, the liquid 14 in the upper liquid chamber 12 is greatly attenuated when passing through the small passage 28 of the orifice 23, and the shock to the vehicle body frame 1 can be reduced.

Therefore, the vibration energy of the power plant 2 is the first
As shown in FIG. 0, the force transmitted to the vehicle body frame 1 can be reduced by the absorption force (a) by the rubber seat 15 and the damping force (b) by the orifice 23.

In the above embodiment, an orifice 23 having a crank-shaped cross section is provided in the partition plate 11, and an L-shaped large passage 27 and a small passage 28 communicating therewith are provided in the valve portion 26 of the rotating spool 25. However, the present invention is not limited to this, and as shown in FIGS. 11A and 11B, a wide passage 35 and a narrow passage 36 made of long holes orthogonal to each other are bored in the shaft portion of the rotating spool 34, and the rotating spool 34 The opening degree of the orifice 37 may be changed by rotating the orifice 37 by 90 degrees.

As explained above, this device uses a partition plate to divide the inside of a casing containing liquid into an upper liquid chamber and a lower liquid chamber, and this partition plate has an orifice whose opening degree can be varied by means of a rotating spool. established,
Since the upper liquid chamber is equipped with an elastic body that elastically deforms in response to the torque of the power unit, and the casing is attached to the vehicle body frame, vibration energy generated from the power unit is absorbed when the elastic body and liquid pass through the orifice. This can be absorbed by the damping force generated by the damping force, and the force transmitted to the vehicle body frame can be significantly reduced. Furthermore, the rotational drive source that rotates the rotary spool is controlled based on the input signal from the sensor that detects the magnitude of the torque of the power plant, and the opening degree of the orifice is varied, so vibrations according to the magnitude of the torque are controlled. This has the effect that absorption can be carried out automatically.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the characteristics of a conventional vibration absorbing member, Fig. 2 is a sectional view showing the structure of a conventional vibration absorbing member, Fig. 3 is a sectional view of a conventional liquid-filled vibration absorbing member, and Fig. 4 is a sectional view showing the structure of a conventional vibration absorbing member. The figure is a perspective view showing one embodiment of this invention, Figure 5 is a plan view, Figure 6 is a sectional view of the vibration absorbing device, Figure 7 is a block diagram of the electric circuit, and Figure 8 is the orifice. Cross-sectional view showing the relationship between and the rotating spool, Figure 9 A, B, C
8 is a sectional view taken along the line in FIG. 8, FIG. 10 is a graph showing the same characteristics, and FIGS. 11A and 11B are plan views of a rotary spool showing other embodiments of this invention. 1...Vehicle body frame, 2...Power unit, 10...
...Casing, 11...Partition plate, 12...Upper liquid chamber, 13...Lower liquid chamber, 14...Liquid, 15...
Rubber seat (elastic body), 23... Orifice, 25...
...Rotary spool, 29...Rotary solenoid (rotary drive source), 32...Control circuit, 33...Sensor.

Claims (1)

[Scope of utility model registration request] A vibration absorbing device that is provided between a vehicle body frame and a power unit mounted on the vehicle body frame and absorbs vibrations generated from the power unit, the casing being attached to the vehicle body frame and containing a liquid therein; a partition plate provided within the partition plate that partitions the interior into an upper liquid chamber and a lower liquid chamber; an elastic body provided in the upper liquid chamber that elastically deforms in response to the torque of the power unit; A rotary drive source having an orifice that communicates the upper liquid chamber and the lower liquid chamber, a rotary spool that adjusts the opening degree of the orifice, and a rotary drive source that is electrically connected to the rotary drive source and controls the magnitude of the torque of the power device. A vibration absorbing device comprising: a control circuit that controls a rotational drive source based on an input signal from a sensor.