JPH0544605Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This idea concerns a flywheel.

[Prior art] As a conventional flywheel, for example, "Automotive Technology No. 12, 1985" (published by the Society of Automotive Engineers of Japan)
There is one shown on pages 1428 to 1433. This flywheel is so-called a flywheel with a torsional damper, and includes an engine side mass, a transmission side mass, a compression spring, and a hysteresis mechanism, as well as bearings for smooth damping operation. It consists of a limit torque mechanism that releases excessive torque generated during operation. Then, the compression spring deflects according to the magnitude of the engine's output torque, and in this state, the compression spring and hysteresis mechanism absorb the fluctuating torque, so the transmission side mass is relative to the engine side mass. The motor rotates with a damped amount of rotational fluctuation, and the averaged torque is transmitted to the drive system. However, because of this structure, if the spring constant of the compression spring is increased, the compression spring will not completely bend even when a large torque is transmitted, and while it can absorb fluctuating torque, It cannot absorb the fluctuating torque when small torque is transmitted, for example when the car is stopped and idling. If the spring constant is made smaller, it is possible to absorb the fluctuating torque when a small torque is transmitted, but when a large torque is transmitted, the compression spring is completely bent, making it impossible to absorb the fluctuating torque.

Therefore, in order to make it possible to absorb the fluctuating torque even when transmitting a relatively large torque or a small torque, a so-called viscous cut spring is installed between the engine side mass and the transmission side mass. is proposed.

[Problems to be solved by the invention] By the way, the flywheel using this viscous cut spring has resistance plates that are alternately engaged with the engine-side mass and the transmission-side mass, and are formed between the two masses. placed in a sealed room,
A viscous fluid such as silicone oil is sealed in this sealed chamber. Therefore, when one resistance plate rotates due to the rotation of the engine-side mass, the other resistance plate rotates through the viscous resistance of the viscous fluid, and torque is transmitted to the transmission-side mass.
In addition, the fluctuating torque on the engine side is damped by the viscous fluid between the two resistance plates, and the same effect as above can be expected, and it is possible to absorb both fluctuating torque when transmitting large torque and absorbing fluctuating torque when transmitting small torque. It is. However, if the transmission torque capacity of the viscous cut spring is set to a value that can absorb the fluctuating torque when transmitting a small torque, the differential rotation speed between the engine side mass and the transmission side mass will increase when a large torque is transmitted, resulting in poor fuel efficiency. There was a problem.

Therefore, this invention solves the above problems and can absorb fluctuating torque even when transmitting relatively large torque and when transmitting small torque. Moreover, it can prevent deterioration of fuel efficiency and absorb fluctuating torque over a wide range. The purpose is to provide a possible flywheel.

[Means for Solving the Problems] In order to achieve the above object, this invention is provided with a relatively rotatable engine-side mass and a transmission-side mass, and a viscous fluid sealed between the two masses. a sealed chamber, a plurality of disk-shaped resistance plates that are engaged with both of the above-mentioned masses in the rotational direction and arranged close to each other in the sealed chamber; A flywheel comprising a sensing means for sensing a predetermined driving torque that is greater than the absorption torque by the sensing means, and an engaging means for engaging the two masses based on the sensing by the sensing means, wherein the sensing means is connected to the sealed chamber. and a compression spring interposed between the mass and either of the masses.

[Function] According to the above configuration, when torque is transmitted below a predetermined level, power from the engine side mass is transmitted to the transmission side mass due to the viscous resistance of the viscous fluid in the sealed chamber due to the differential between the resistance plates. Vibration caused by torque fluctuations is damped and absorbed by the viscous resistance of the viscous fluid in the sealed chamber, but when the transmitted torque exceeds a predetermined value, the sensing means senses this, and this sensing causes the engaging means to engage the engine side mass. Connects to the transmission side mass and transmits torque.

Furthermore, since the compression spring of the sensing means is deflected by fluctuating torque, it is possible to absorb a wide range of fluctuating torque.

[Example] This invention will be described below based on an example shown in the drawings.

An intermediate member 7 is interposed between the engine side mass 3 and the transmission side mass 5 of the flywheel 1. This intermediate member 7 is formed of an engine-side disk 9 on the engine-side mass 3 side and a transmission-side disk 11 on the transmission-side mass 5 side, and both the disks 9 and 11 have opposing surfaces. They are fixed with a seal member 13 interposed therebetween. This intermediate member 7 is supported on the circumferential surface of the engine-side mass 3 with a seal member 15 and bearing members 17 and 19 interposed therebetween so as to be relatively rotatable. The other side of the intermediate member 7 is elastically supported by the transmission-side mass 5 and a friction material 27 having a leaf spring 25 that sandwiches the bearing material 21 and the protrusion 23 of the transmission-side mass 5. It is rotatable.

A sealed chamber 29 containing a viscous fluid is formed between the engine-side mass 3 and the intermediate member 7. Within this sealed chamber 29, splines 31 and 33 are formed on the outer peripheral surface of the engine-side mass 3 and the inner peripheral surface of the engine-side disc 9 of the intermediate member 7, and both splines 31 and 33 are connected to a plurality of resistors. The plates 35, 37 are alternately engaged in close proximity to each other. These resistance plates 35 and 37 are configured to rotate relative to each other together with the engine side mass 3 and the intermediate member 7. 3
9 is a spacer ring interposed between the resistance plates 37, 37.

The intermediate member 7 and the transmission side mass 5
A sensing means 41 that senses the driving force transmitted from the engine to the transmission through the flywheel 1, and an engagement that engages the engine side mass 3 and the intermediate member 7 based on the sensing of the sensing means 41. Means 43 are provided.

The sensing means 41 consists of a compression spring 45 and an engagement ring 47 that can be engaged with the compression spring 45. Further, the engaging means 43 is configured such that a moving member 49 is provided between both the masses 3 and 5 so as to be engageable and detachable, and the moving member 49 is provided with a guide groove 51 formed in a bent manner.

Compression spring 4 of sensing means 41
5 consists of a coiled spring as shown in FIGS. 1 and 2, and the transmission side disk 11 of the intermediate member 7
It is located in a gap 55 existing between the opposing surfaces of the disk 53 and the disk 53 fixed to the transmission side disk 11, and is biased in the circumferential direction. Both ends of the compression spring 45 are held by the disc 53 and the engagement ring 47 via engagement members 45a.

Further, the engagement ring 47 fixed to the transmission mass 5 engages with the engagement member 45a at the engagement portion 47a, and is provided in the cavity 55. The compression spring 45 is configured to contract in proportion to the magnitude of the driving torque between the intermediate member 7 and the transmission-side mass 5.

The movable member 49 of the engagement means 43 has a spline 57 formed on its outer periphery.
is engaged with a spline 59 formed on the inner periphery of the transmission-side disc 11 of the intermediate member 7, and is disposed so as to be movable in the axial direction between the engine-side mass 3 and the transmission-side mass 5. There is. As shown in FIG. 3, a guide groove 51 is formed on the inner periphery of the moving member 49, and is bent in the circumferential direction and in the axial direction.
A guide pin 61 attached to the transmission side mass 5 is movably inserted therein.

More specifically, the guide groove 51 is formed of a release portion 51a on the engine side mass 3 side, a pressing portion 51c on the transmission side mass 5 side, and a communication portion 51b that communicates between the release portion 51a and the pressing portion 51c at an inclination angle, and when the guide pin 61 is in the release portion 51a, the moving member 49 is positioned in a direction away from the engine side mass 3, and
When the guide pin 61 comes to the pressing portion 51c from the releasing portion 51a along the inclination angle of the communicating portion 51b, the moving member 49 moves in the axial direction toward the engine side mass 3 side.

Further, a leaf spring 63 and a friction plate 65 are interposed between the opposing surfaces of the engine side mass 3 and the moving member 49, and can absorb shock in the event of a collision between the two, and prevent slipping and reduce friction. They are becoming unified through bonding. Note that 67 is a restriction ring that restricts the movement of the moving member 49 toward the transmission side mass 5, and a ring gear 69 for starting is fixedly connected to the engine side mass 3.

Next, the operation of the embodiment having the above configuration will be explained. The power transmitted from the engine to the engine-side mass 3 through the crankshaft causes the resistance plate 35 to rotate together with the engine-side mass 3, and further,
Due to the viscous resistance of the viscous fluid caused by the rotation of the resistance plate 35, the resistance plate 37 also rotates integrally, and the transmission side disc 11 fixed to the engine side disc 9 that engages with the resistance plate 37 also rotates. ,
Torque is transmitted from the disk 53 fixed to the transmission side disk 11 via the compression spring 45 to the engagement ring 47 fixed to the transmission side mass 5, and the torque is transmitted to the transmission side. Further, vibrations caused by torque fluctuations are damped and absorbed by the viscous fluid between the resistance plates 35 and 37 provided in the sealed chamber 29, and transmission to the transmission side is suppressed.

By the way, when the driving torque exceeds a predetermined value, the compression spring 45 is bent and a relative positional deviation occurs, and the guide pin 61 moves inside the guide groove 51 into the release part 5.
It moves while being guided from 1a to the inside of the pressing part 51c via the communication part 51b. This movement of the guide pin 61 is caused by the communication portion 51b having an inclination angle, so that the moving member 49 moves in a direction closer to the engine side mass 3 side. With this movement, the leaf spring 63 and the friction plate 65 are pressed, and the moving member 4
9 is pressed against the engine-side mass 3, and the engine-side mass 3 and the intermediate member 7 are connected.

As a result, the engine side mass 3, the intermediate member 7,
The transmission-side mass 5 and the transmission-side mass 5 rotate together, and power is transmitted from the engine-side mass 3 to the transmission-side mass 5. Therefore, slippage is suppressed when the torque is higher than the set torque, and fuel efficiency can be improved. In this case, the compression spring 45 can be further bent and the fluctuation torque can be absorbed by the compression spring 45.
It can also be absorbed by a wide range of fluctuating torque. Further, if the torque is large even at low rotations, the above-mentioned pressure contact action is performed, and it is possible to sufficiently cope with the large torque at low rotations when driving on a steep slope or on a rough road.

FIG. 4 shows a second embodiment, in which the moving member 49 is moved using the magnetic force of the excitation coil 71, and the engine side mass 3 and the intermediate member 7 can be freely engaged and disengaged. It is something.

The movable member 49 has a spline 73 formed on its outer periphery, and the spline 73 engages with a spline 75 formed on the inner periphery of the engine-side mass 3 so as to be movable in the axial direction. An excitation coil 71 is interposed at a position on the transmission side disc 11 facing the moving member 49. 77 is a slip ring connected to the battery, and 79 is a transmission side disk 1 facing into the cavity 55.
ON/OFF of excitation coil 71 attached to 1
This switch 79 is designed to turn on and off by sensing the relative positional deviation between the intermediate member 7 and the transmission side mass 5. Note that the back surface of the switch 79 is biased by an elastic body.

In this second embodiment, when the driving torque exceeds a predetermined value, the compression spring 45 is bent, and the intermediate member 7 and the transmission side mass 5 are bent.
Due to the relative positional deviation, the switch 79 is turned ON and the excitation coil 71 is energized, thereby attracting and connecting the movable member 49 to the transmission side disc 11, stopping the slip between the resistance plates 35 and 37, and starting the engine. The side mass 3, intermediate member 7, and transmission side mass 5 are configured to rotate integrally. Note that the same components as those in the first embodiment are given the same numbers and the description thereof will be omitted.

5 to 7 show a third embodiment, which includes an engaging portion 45a fixed to a compression spring 45 and an engaging portion 47 of an engaging ring 47.
Compression spring 4 by engagement with a
5 turns the excitation coil 81 ON and OFF, and the movable member 49 is guided by the spline 83 and moves in the axial direction, allowing the engine side mass 3 and the transmission side disk 11 to engage and disengage freely. It is structured like this.

In Fig. 7, the ON state (the state in which the compression spring 45 is bent and reaches the compression limit)
is shown by a dotted line, and the OFF state (a state in which the compression spring 45 is extended) is shown by a solid line. 85 is a support member that supports the compression spring 45 and is fixed to the intermediate member 7;
87 is a slip ring connected to the battery. The operation is almost the same as that of the second embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.

[Effect of the invention] As is clear from the above, according to this invention,
Fluctuations in drive torque, such as when the engine is idling, are alleviated by the sliding between the resistance plates, making it possible to prevent vibrations in the power transmission system. In addition, even if the input rotation to the engine side mass is low, if the torque is large, the engagement means engages both masses based on the detection by the sensing means, so it can sufficiently cope with low rotation and large torque. At the same time, it is possible to improve fuel efficiency. Furthermore, since the compression spring of the sensing means can be deflected by varying torque, it is possible to absorb a wide range of varying torque.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the radius portion of the first embodiment;
The figure is a partial front view showing the state of engagement and disengagement between the compression spring and the engagement ring, and FIG. 3 is a sectional view taken along the line -- in FIG. 1. FIG. 4 is a sectional view of the radius portion of the second embodiment. Figures 5 to 7 are
An example is shown, FIG. 5 is a sectional view of the radius part, and FIG.
The figure is a partially cutaway front view, and FIG. 7 is a partially front view showing the state of engagement and disengagement between the compression spring and the engagement ring. Explanation of symbols indicating main parts of the drawings: 1...Flywheel, 3...Engine side mass, 5...Transmission side mass, 29...Sealed chamber, 35, 3
7... Resistance plate, 41... Sensing means, 43... Engaging means, 45... Compression spring.

Claims (1)

[Scope of utility model registration request] An engine-side mass and a transmission-side mass that are relatively rotatable, a sealed chamber in which a viscous fluid is sealed between the two masses, and each mass is engaged in the rotational direction in the sealed chamber and is close to each other. a plurality of disc-shaped resistance plates disposed as such, a sensing means for sensing a predetermined drive torque greater than the torque absorbed by the resistance plates due to a positional shift in the rotational direction between the two masses; and a sensing means for sensing and an engaging means for engaging the two masses based on the above, wherein the sensing means has a compression spring interposed between the sealed chamber and either of the two masses. A flywheel featuring