JPS648219B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for a motor vehicle, and in particular to one in which a friction clutch is interposed in the transmission path.

Generally, in the above-mentioned automotive power transmission device,
When sudden fluctuations in rotation or torque occur in the engine, these fluctuations are directly transmitted to the output shaft through the friction clutch, causing vibrations in the vehicle body, which not only impairs riding comfort, but also causes the fluctuations to affect the durability of the friction clutch. There is a problem that it affects the lifespan.

The present invention was proposed in view of the above, and it is possible to solve the above problems by incorporating a viscous joint into the flywheel interposed between the power shaft of the engine and the friction clutch, and furthermore, by incorporating the viscous joint into the flywheel interposed between the power shaft of the engine and the friction clutch. An object of the present invention is to provide a power transmission device for an automobile that can effectively alleviate shocks caused by friction clutch operations associated with starting and shifting.

In order to achieve this object, the present invention provides a power transmission device for an automobile that transmits the torque of the power shaft of an engine to the output shaft side through a flywheel and a friction clutch sequentially, the flywheel comprising: an input-side rotary body that rotates integrally with the power shaft, and is fitted and supported by the input-side rotary body so as to be relatively rotatable so as to cooperate with the input-side rotary body to define a viscous fluid chamber; The friction clutch is composed of an output rotating body integrally connected to the friction clutch, and a viscous joint that transmits the torque of the input rotating body to the output rotating body within the viscous fluid chamber through viscous resistance of the viscous fluid. A viscous joint includes a rotary plate portion having a first viscous friction rotating surface located in the viscous fluid chamber and rotating together with the input side rotating body, and a rotating plate portion having a first viscous friction rotating surface located in the viscous fluid chamber, and a space between the first viscous friction rotating surface and the rotating plate portion located in the viscous fluid chamber. and a second viscous friction rotating surface facing each other with a rotation speed of the power shaft, and an annular torque transmission device including a torque transmission rate changing mechanism that reduces the distance as the rotation speed of the power shaft increases,
The output side rotating body is composed of two members detachably connected to each other so that the rotating plate part and the torque transmission device can be inserted into the viscous fluid chamber,
The outer circumferential surface of the torque transmission device is spline-fitted to the inner circumferential surface of one of the members facing the viscous fluid chamber.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
2 to the output shaft 23, and from the output shaft 23 to the wheels, sequentially passing through a transmission and a differential device (not shown).

The flywheel A has an input-side rotary body 3 and an output-side rotary body 7, and the inner peripheral side portion of the hub portion 4 of the input-side rotary body 3 is attached to the power shaft 1 by a fixing means 2 such as a fixing bolt. A pair of bearings 8, 8' and a pair of seal members 9,
It is rotatably fitted and supported by 9'. The output side rotating body 7 is composed of first and second members 7a and 7b that are connected to each other via a bolt _b1 , and a bearing 8 and a seal member 9 are provided on the inner circumference of the first member 7a. Further, a bearing 8' and a seal member 9' are respectively fitted to the inner peripheral portion of the second member 7b. The first and second members 7a and 7b cooperate with the input rotating body 3 to define an annular viscous fluid chamber 10, and the viscous joint B operates within this viscous fluid chamber 10. Therefore, the torque of the input rotating body 3 is transmitted to the output rotating body 7 under the action of viscous resistance of a high viscosity fluid such as silicone oil filled in the viscous fluid chamber 10. .

The outer circumferential portion of the annular rotating plate portion 5 that protrudes radially outward from the center of the outer circumferential surface of the hub portion 4 into the viscous fluid chamber 10 is formed as a thick portion. As seen in the axial direction, viscous friction rotating surfaces 5a and 5a' are formed on both front and rear surfaces, respectively, and an involute is formed from the inner circumferential end to the outer circumferential end of the thick portion, as shown in FIG. A large number of shaped fluid guide passages 6 pass through it.

The outer peripheral surface of a torque transmission cylinder 13 is spline-fitted 20 to the inner peripheral surface of the second member 7b facing into the viscous fluid chamber 10 and surrounding the rotating plate part 5. , first and second members 7
When separating a and 7b, the second member 7b can be inserted and removed in the axial direction through the open end thereof. At one end edge of the torque transmission cylinder 13, there is a viscous friction rotating surface 1 that faces the viscous friction rotating surface 5a.
The outer periphery of the annular torque transmission plate 11 with the torque transmission cylinder 13 is integrally connected.
The outer circumferential portion of an annular torque transmission plate 12 having a viscous friction rotating surface 12a facing the viscous friction rotating surface 5a' is spline-fitted 18 to the inner circumferential portion of the portion near the other end. Then, the viscous friction rotating surface 5
a and the viscous friction rotating surface 11a, and between the viscous friction rotating surface 5a' and the viscous friction rotating surface 12a,
Resilient springs 19 and 19', such as wave-shaped disc springs, are interposed, which reciprocate so that the intervals between the respective viscous friction rotating surfaces are equal to each other.

A torque transmission rate changing mechanism 15 is disposed on the outer periphery of the torque transmission plate 12 on the side opposite to the viscous friction rotating surface 12a. The torque transmission rate changing mechanism 15 is
Annular inclined surface 2 formed on the torque transmission plate 12
5 and an annular inclined surface 26 formed on the restraining member 14 whose outer peripheral portion is fixed to the edge of the torque transmission cylinder 13, and the outer peripheral side formed by the pair of inclined surfaces 25 and 26 is A plurality of arc-shaped wedge members 16 having a thin outer circumferential side and a thick inner circumferential side are arranged in the gap having a narrow width and a wide inner circumferential side along the circumferential direction. A tension spring 17 is tensioned. Further, each wedge member 16 is prevented from moving further inward in the radial direction by an annular stopper portion 24 formed on the torque transmission plate 12.
Thus, the torque transmission cylinder 13 and the torque transmission plate 1
2, 11, springs 19, 19', and torque transmission rate changing mechanism 15 cooperate with each other to constitute the torque transmission device T of the present invention.

An input member 22a of a friction clutch 22 is integrally connected to the outer periphery of the second member 7b of the output side rotating body 7, and an output that is frictionally connected to this input member 22a via a clutch friction plate 22b. The output shaft 23 is spline-fitted to the member 22c.

With the above configuration, when the engine is operated and the power shaft 1 rotates, the power shaft 1
The input-side rotary body 3 also rotates integrally with the viscous fluid chamber 10, but at this time, the viscous fluid in the viscous fluid chamber 10 moves from the inner circumferential end of the thick portion of the rotary plate portion 5 to the outer circumferential end along the viscous guide path 6. This causes internal circulation of the viscous fluid within the viscous fluid chamber 10, and the viscous fluid is cooled by this internal circulation. Due to the viscous resistance of the viscous fluid between the viscous friction rotating surface 5a and the viscous friction rotating surface 11a and between the viscous friction rotating surface 5a' and the viscous friction rotating surface 12a, the torque of the input side rotating body 3 is The torque is transmitted to the torque transmission plates 11 and 12,
Furthermore, the torque transmitted to these torque transmission plates 11 and 12 is transmitted to the torque transmission cylinder 13 and the second member 7b. The torque transmitted from the input side rotating body 3 to the output side rotating body 7 via the viscous joint B in this way is transmitted to the output shaft 23 via the friction clutch 22, and further from the output shaft 23 to a gear shift (not shown). The signal is transmitted sequentially through the motor and differential gear.

When sudden fluctuations in rotation or torque occur in the engine, the fluctuations are relaxed and attenuated by the viscous joint B, and are transmitted to the output rotating body 7 as smooth rotation and torque fluctuations. Then, while the rotation speed of the output side rotating body 7 is low, each wedge member 1
6 is positioned radially inward by the action of the tension spring 17, so that each torque transmission plate 11,1
2 is located at a relatively large distance from each viscous friction rotating surface 5a, 5a' due to the elastic force of each elastic spring 19, 19', and the torque transmission rate due to viscous resistance of the viscous fluid is kept relatively small. Furthermore, as the rotational speed of the output rotary body 7 increases, each wedge member 16 moves radially outward against the tensile force of the tension spring 17 due to centrifugal action, and accordingly, the torque transmission plate 12 By pressing and moving the restraining members 14 in the direction away from each other, each torque transmission plate 11, 12 resists the elastic force of each elastic spring 19, 19', and moves each viscous friction rotating surface 5a. , 5a', and as a result, the torque transmission rate due to the viscous resistance of the viscous fluid increases. Therefore, in the low rotation speed range where engine torque fluctuations are a particular problem, it is highly effective in preventing vibrations inside and outside the power transmission system caused by sudden torque fluctuations, and in the high rotation speed range. can ensure high power transmission rate.

As described above, the automotive power transmission device of the present invention is an automotive power transmission device that transmits the torque of the power shaft of the engine to the output shaft side through the flywheel and the friction clutch in sequence, and the flywheel includes: an input-side rotary body that rotates integrally with the power shaft, and is fitted and supported by the input-side rotary body so as to be relatively rotatable so as to cooperate with the input-side rotary body to define a viscous fluid chamber; The friction clutch is composed of an output rotating body integrally connected to the friction clutch, and a viscous joint that transmits the torque of the input rotating body to the output rotating body within the viscous fluid chamber through viscous resistance of the viscous fluid. The viscous joint includes a rotating plate portion having a first viscous friction rotating surface located in the viscous fluid chamber and rotating together with the input side rotating body, and a rotating plate portion having a first viscous friction rotating surface located in the viscous fluid chamber, and a rotating plate portion having a first viscous friction rotating surface located in the viscous fluid chamber. and a second viscous friction rotating surface facing each other, and an annular torque transmission device including a torque transmission rate changing mechanism that reduces the interval as the rotational speed of the power shaft increases, and the output The side rotating body is composed of two members detachably connected to each other so that the rotary plate part and the torque transmission device can be inserted into the viscous fluid chamber, and one of the members faces the viscous fluid chamber. Since the outer circumferential surface of the torque transmission device is spline-fitted to the inner circumferential surface, even if sudden fluctuations in rotation or torque occur in the engine, the fluctuations are effectively damped by the viscous joint, and the friction clutch and output are effectively damped. It is not directly transmitted to the shaft side, and therefore it is possible to avoid a reduction in the life of the friction clutch and occurrence of vehicle body vibration due to the above fluctuations. In particular, by specially providing the above-mentioned torque transmission rate changing mechanism, the torque transmission rate can be lowered in the low rotation range where the engine torque fluctuations are large, and the torque fluctuations can be effectively absorbed. In high rotation ranges where this is not a serious problem, it is possible to increase the torque transmission rate and reduce power transmission loss due to viscous joints. In addition, the viscous joint can effectively dampen the shock caused by the operation of the friction clutch when starting or changing gears of an automobile, and therefore can greatly contribute to improving riding comfort. In addition, the above flywheel has a built-in viscous joint and is integrally connected with a relatively heavy friction clutch, so that sufficient inertial mass can be obtained without the need for a special large weight. Furthermore, since the flywheel itself can be used as the casing of the viscous joint, the joint structure becomes simpler and costs can be reduced. Further, the output rotating body of the flywheel is composed of the two separable members, and the outer circumferential surface of the annular torque transmission device of the viscous joint is spline-fitted to the inner circumferential surface of one of the members facing the viscous fluid chamber. As a result, the torque transmission device, which has a relatively complicated structure and includes the torque transmission rate changing mechanism, can be easily retrofitted to the output rotating body, improving the ease of assembling the device. can contribute to

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a power transmission device according to an embodiment of the present invention, and FIG. 2 is a front view of the main part of FIG. 1. 1...Power shaft, 3...Input side rotating body, 5a, 5
a'...first viscous friction rotating surface, 5...rotating plate part,
7...Output side rotating body, 7a, 7b...first, second
Member, 10... Viscous fluid chamber, 11a, 12a...
Second viscous friction rotating surface, 15... Torque transmission rate changing mechanism, 20... Spline fitting, 22... Friction clutch, 23... Output shaft, A... Flywheel, B... Viscous joint, T... ...Torque transmission device.

Claims (1)

[Claims] 1 The torque of the power shaft 1 of the engine is transferred to the output shaft 2 through the flywheel A and the friction clutch 22 in sequence.
An automotive power transmission device that transmits power to three sides,
The flywheel A includes an input rotating body 3 that rotates integrally with the power shaft 1, and a rotary body 3 that is opposed to the input rotating body 3 to cooperate with the input rotating body 3 to define a viscous fluid chamber 10. The output side rotating body 7 is rotatably fitted and supported and is integrally connected to the friction clutch 22, and the torque of the input side rotating body 3 is controlled by the viscous resistance of the viscous fluid within the viscous fluid chamber 10. and a viscous joint B that transmits the transmission to the output side rotary body 7, and this viscous joint B has first viscous friction rotation surfaces 5a and 5a' located in the viscous fluid chamber 10 and is connected to the input side. a rotating plate portion 5 that rotates together with the rotating body 3; and a second viscous friction rotating surface 11 that faces the first viscous friction rotating surfaces 5a, 5a' with a gap in the viscous fluid chamber 10.
a, 12a, and an annular torque transmission device T including a torque transmission rate changing mechanism 15 that reduces the interval as the rotational speed of the power shaft 1 increases, and the output side rotating body 7 The rotary plate portion 5 and the torque transmission device T are provided in the viscous fluid chamber 10.
It is composed of two members 7a and 7b that are removably connected to each other so that the torque transmitting device T can be loaded therein, and the outer peripheral surface of the torque transmitting device T is formed on the inner peripheral surface of one of the members 7b facing the viscous fluid chamber 10. Spline fitting 20
An automobile power transmission device characterized by: