JPH09177896A - Flywheel with torsional damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a torque fluctuation absorption effect during normal operation through reduction of the friction force of a mechanical friction mechanism and to increase a damping effect for a purpose of preventing the occurrence of resonance phenomenon at a resonance point. SOLUTION: A flywheel is divided into two flywheels of one being a flywheel 2 on the drive side and the other being a flywheel 4 on the driven side and a spring mechanism 7 and an oil damper mechanism are arranged between the two flywheels. An oil damper mechanism is provided with a piezoelectric element 81 to produce a piezoelectric effect by utilizing a fluctuation force increased during resonance of the flywheel. By applying electric energy (a voltage) fetched from the piezoelectric element 81 on electric viscous fluid 11, viscous resistance of the electric viscous fluid 11 is increased and the damping effect of the oil damper mechanism is increased. As a result, since there is no need to feed a power source to the electric viscous fluid 11 in the rotating flywheel from the outside, constitution and handling are simplified and a device is formed in a compact manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel with a torsion damper attached to an internal combustion engine or the like.

[0002]

2. Description of the Related Art Conventionally, in order to suppress fluctuations in engine rotation,
As a split type flywheel in which a flywheel is divided into two members and they are connected by a spring to absorb a torque fluctuation, there is one as shown in Japanese Utility Model Publication No. 5-44603. However, this method has a resonance point at a certain engine rotation. Normally, the spring constant is determined so that the resonance point is lower than the normal rotation range of engine rotation, but the resonance point is passed when the engine is started and stopped. Therefore, generally, in order to prevent this resonance phenomenon, a mechanical frictional force is added, but this frictional force needs to be increased to some extent. Therefore, in the normal rotation range, the rotational fluctuation of the drive side flywheel causes the driven side flywheel Therefore, there is a problem that the torque fluctuation absorbing effect is reduced.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the frictional force of the mechanical friction mechanism is reduced to increase the torque fluctuation absorbing effect during normal operation and to increase the damping effect to prevent the resonance phenomenon at the resonance point. With the goal.

[0004]

Means for Solving the Problems and Actions / Effects The present invention uses the technical means as set forth in claim 1 to achieve the above object. As a result, the frictional force of the mechanical friction mechanism can be reduced, the torque fluctuation absorbing effect during normal operation can be increased, and the damping effect can be increased to prevent the resonance phenomenon at the resonance point. Further, since it is not necessary to supply power to the electrorheological fluid in the rotating flywheel from the outside, the configuration and handling are simple, and the device can be compactly constructed.

[0005]

1 to 3 relate to a first embodiment of the present invention. FIG. 1 is a side sectional view taken along the central axis of rotation of a flywheel with a torsion damper, and FIG. 2 is a front view. FIG. 3 is a partial cross-sectional view with a part cut away, and FIG. 3 is a cross-sectional view showing a cross section AA in FIG. 2.

In FIG. 1, a drive plate 2, which is a drive side flywheel, is connected to a crankshaft 1 serving as a drive shaft by bolts (not shown) and integrally rotates. The drive plate 2 is formed by integrally connecting a ring-shaped drive plate body 21 and a side plate 22 with a screw 3. A ring gear 23 for a starter is formed on the outer peripheral portion of the drive plate body 21.

A driven plate 4 which is a driven flywheel capable of rotating relative to the drive plate 2 is disposed coaxially with the drive plate 2 and a bearing 5
It is rotatably supported by the drive plate 2 via. A mechanical friction mechanism 6 is housed in the driven plate 4. Drive plate 2 and driven plate 4
A spring mechanism 7 and a piezoelectric device 8 are provided between and in the circumferential direction at equal positions. As shown in FIGS. 1 and 2,
The spring mechanism 7 includes a coil spring 71, which is a spring member, and a seat portion 2 provided in a part of the drive plate body 21.
1b, a seat portion 4a provided on a part of the driven plate 4.

As shown in FIGS. 1 to 3, reference numeral 10 denotes a part of an oil damper mechanism. The oil damper mechanism includes an electrorheological fluid 11, a plus electrode 12, a piezoelectric device 8,
The voltage application circuit 9 and the long groove 21a are also included. Piezoelectric device 8
Is a laminated piezoelectric element 81, a piston 82 also serving as a casing, a preset load is applied to the piezoelectric element 81, and a spring seat 21b of the drive plate main body 21.
The top portion 21c of the is composed of a disc spring 83 for absorbing a shock when the coil spring 71 is compressed and hit, and a base plate 84 for fixing the piezoelectric element 81. Reference numeral 9 is a voltage application circuit section for rectifying and charging electric energy generated from the piezoelectric device 8.

Reference numeral 21a is a long groove formed at four locations in the circumferential direction of the drive plate body 21, in which the electrorheological fluid 1
1 is enclosed. Reference numeral 12 denotes an arc-shaped positive electrode for applying a voltage to the electrorheological fluid 11, which is electrically insulated from the driven plate 4 by a screw 13 via an insulating plate 14 made of an insulating material and an insulating spacer 15. It is fixed in the state. Reference numeral 16 is a lead wire, and a screw 1 is attached to the + electrode 12 for applying a voltage to the electrorheological fluid 11.
It is connected by 7.

Reference numerals 18 and 19 are O-rings for sealing.
Further, the O-rings 30 and 31 are for sealing the viscous fluid 11 between the driven plate 4 protruding in a ring shape and the drive plate main body 21 formed in a ring shape. The operation of the above configuration will be described. The engine operates, and the rotational force of the engine causes the drive plate 2, which is the drive side flywheel, to integrally rotate via the crankshaft 1. This rotational force is applied to the spring mechanism 7
And, via the mechanical friction mechanism 6, it is transmitted to the driven plate 4 which is a driven side flywheel.

Here, when there is torque fluctuation in the rotational force of the engine, the coil spring 71 of the spring mechanism 7 expands and contracts according to the torque fluctuation, thereby absorbing torque fluctuation during normal operation. Here, since the mechanical friction mechanism 6 is set to be relatively small, the torque fluctuation absorbing effect can be sufficiently increased. When the engine passes through the resonance point at the time of starting and stopping, a resonance phenomenon occurs at the number of revolutions, the relative rotation fluctuation between the drive plate 2 and the driven plate 4 becomes large, and the projection 21c of the drive plate main body 21 becomes large. Hits the top portion 82a of the piston 82 of the piezoelectric device 8 arranged on the driven plate 4, a load is applied to the piezoelectric element 81 via the disc spring 83, and electric energy (voltage) is generated by the piezoelectric effect. Then, the voltage is applied to the positive electrode 12 of the damper mechanism 10 via the lead wire 16 after being rectified and charged by the voltage applying circuit section 9.

Then, a voltage is applied to the electrorheological fluid 11a existing in the narrow flow path between the positive electrode 12 and the drive plate body 21 which is the negative electrode, and the viscous resistance increases.
In addition, the long groove portion 21a provided in the drive plate main body 21 and the viscous fluids 11b, 1b in the space portions on both sides of the arc-shaped + electrode 12 provided in the driven plate 4.
1c needs to go up and down the flow path as shown by the arrow in FIG. 3 according to the relative movement. At this time, if the viscous resistance becomes large, the damping resistance to the relative movement becomes large, so that the vibration It can be rapidly attenuated and the resonance phenomenon can be stopped.

Since there is no need to externally supply power to the electrorheological fluid 11 in the rotating flywheel in this way, the construction and handling are simple, and the apparatus can be compactly constructed. In the first embodiment, the spring mechanism 7 and the oil damper mechanism 10 are mounted on the flywheel.
However, the number can be increased or decreased depending on the effect.

Further, the voltage applying circuit section 9 is connected in parallel regardless of the number of the piezoelectric devices 8, and the electric energy from the piezoelectric device 8 is collected in one voltage applying circuit section. Power may be distributed to each + electrode 12 and a voltage may be applied to the electrorheological fluid 11. Also,
The arrangement of the spring mechanism 7 and the piezoelectric device 8 may be separate positions.

[Brief description of the drawings]

FIG. 1 is a side sectional view taken along a rotation center axis of a flywheel with a torsion damper according to a first embodiment.

FIG. 2 is a partial cross-sectional view showing a front view of a flywheel with a torsion damper according to the first embodiment, with a part cut away.

3 is a cross-sectional view showing a cross section AA in FIG.

[Explanation of symbols]

 2 Drive side flywheel (drive plate) 4 Driven side flywheel (driven plate) 7 Spring mechanism 10 Oil damper mechanism 11 Electrorheological fluid 81 Piezoelectric element

Claims (1)

[Claims] 1. A flywheel is divided into a drive-side flywheel and a driven-side flywheel, and a spring mechanism and an oil damper mechanism are provided between these flywheels, and the oil damper mechanism includes A piezoelectric element that produces a piezoelectric effect by utilizing a fluctuating force that increases when the flywheel resonates, and applies electric energy (voltage) extracted from the piezoelectric element to an electrorheological fluid sealed in the oil damper mechanism. Thus, the flywheel with a torsion damper is characterized in that the viscous resistance of the electrorheological fluid is increased to increase the damping effect of the oil damper mechanism.