JP2017032084A - Torque fluctuation absorber - Google Patents

Abstract

A torque fluctuation absorber that can prevent uneven wear even when the frictional force between a first rotating member and a second rotating member is changed.
A torque fluctuation absorber includes a first rotating member and a second rotating member. Between the first rotating member 5 and the second rotating member 6, a washer 9 that rotates integrally with the first rotating member 5 in order from the second rotating member 6 side, and the washer 9 is directed toward the second rotating member 6. An elastic member 11 to be pressed and an adjustment member 10 that is rotatably engaged with the first rotation member 5 at a certain angle are disposed. The adjusting member 10 is screwed with the second rotating member 6 so as to be relatively rotatable. When torsional torque is input between the adjusting member 10 and the second rotating member 6, the adjusting member 10 is displaced in the axial direction with respect to the second rotating member, and the pressing load of the elastic member 11 on the washer 9 is changed. Thus, the frictional force generated between the washer 9 and the second rotating member 6 is changed.
[Selection] Figure 4

Description

  The present invention relates to a torque fluctuation absorber that absorbs fluctuations in engine torque.

  2. Description of the Related Art Conventionally, there is known a torque fluctuation absorber that is arranged between a drive source composed of an internal combustion engine and a transmission and absorbs torque fluctuation of a driving force output from the drive source (see, for example, Patent Document 1).

  In the thing of patent document 1, the 1st rotation member to which the driving force from a motor | power_engine is transmitted, the coil spring which absorbs a torque fluctuation | variation, and the driving force transmitted to the 1st rotation member are transmitted via a coil spring. A second rotating member; and a friction force adjusting mechanism capable of adjusting the frictional force between the first rotating member and the second rotating member. The frictional force adjusting mechanism is also called a hysteresis mechanism.

  The frictional force adjusting mechanism of Patent Document 1 includes a control plate that rotates integrally with the second rotating member, an inclined surface that rotates integrally with the first rotating member, is movable in the axial direction, and is slidable with the control plate. And a resilient member that presses the thrust member against the control plate.

  When a torsion torque on the deceleration side is generated between the first rotating member and the second rotating member, the frictional force adjusting mechanism slides on the inclined surface where the control plate and the thrust member abut, and the thrust member is axially moved. Move to. Due to the movement of the thrust member, the pressing load by which the elastic member presses the thrust member against the control plate changes, and the frictional force (hysteresis, difficulty of twisting) between the first rotating member and the second rotating member is adjusted. The frictional force (hysteresis) between the first rotating member and the second rotating member is reduced.

  With this configuration, in Patent Document 1, the necessary frictional force (hysteresis) can be obtained when the acceleration side torsion torque is generated, and conversely, when the deceleration side torsion torque is generated. The frictional force (hysteresis) can be reduced.

JP 2014-62623 A

  In the conventional torque fluctuation absorber, as the frictional force (hysteresis) between the first rotating member and the second rotating member is increased, the area of the contact portion between the control plate and the thrust member is reduced, and the friction material The inventor has found that there is a problem that pressure cannot be applied uniformly, wear of only the portion corresponding to the contact portion becomes intense, and uneven wear tends to occur, and the friction coefficient is difficult to stabilize.

  In view of the above, the present invention has an object to provide a torque fluctuation absorber that can prevent uneven wear even if the frictional force (hysteresis) between the first rotating member and the second rotating member is changed. .

[1] In order to achieve the above object, the present invention provides:
A rotatable first rotating member;
A second rotating member disposed coaxially adjacent to the first rotating member in the axial direction;
A hub extending from a radially inner portion of the second rotating member toward the first rotating member;
A male screw portion provided on the outer peripheral surface of the hub;
A washer disposed between the first rotating member and the second rotating member;
An adjustment that is disposed between the first rotating member and the washer, is engaged with the first rotating member so as to be rotatable at a predetermined angle, and is threadably engaged with the male screw portion. Members,
An elastic member disposed between the washer and the adjustment member, and pressing the washer toward the second rotating member;
When a torsional torque is input between the adjusting member and the second rotating member, the adjusting member is displaced in the axial direction with respect to the washer, and the pressing load of the elastic member is changed to change the washer. And a frictional force generated between the second rotating member and the second rotating member.

  According to the present invention, the adjusting member is screwed into the male screw portion of the hub, and even if the frictional force between the first rotating member and the second rotating member is changed, the adjusting member and the elastic member are all It is possible to maintain a state in which the contact is made uniformly over the circumference. Therefore, the occurrence of uneven wear as in the conventional case can be prevented, and the durability of the torque fluctuation absorber can be improved.

  [2] In the present invention, the adjustment member may be configured such that when the deceleration torque is applied to the first rotation member such that the first rotation member decelerates relative to the second rotation member, The male screw portion can be screwed so as to be separated from the washer.

The skeleton figure which shows the power transmission device using embodiment of the torque fluctuation absorber of this invention. Sectional drawing which shows the torque fluctuation absorber of this embodiment. Explanatory drawing which shows the torque fluctuation absorber of this embodiment from an axial direction. FIG. 4A is an explanatory diagram illustrating a state during deceleration of the torque fluctuation absorber according to the present embodiment. FIG. 4B is an explanatory diagram illustrating a state during acceleration of the torque fluctuation absorber according to the present embodiment. FIG. 5A is an explanatory view showing the state of acceleration of the torque fluctuation absorber according to the present embodiment from the axial direction. FIG. 5B is an explanatory diagram showing a state during deceleration of the torque fluctuation absorber according to the present embodiment from the axial direction.

  As shown in FIG. 1, a torque fluctuation absorber 1 according to an embodiment of the present invention is disposed between a prime mover 2 and a transmission 3 made of an internal combustion engine, and absorbs torque fluctuations of the prime mover 2.

  The torque fluctuation absorber 1 includes a first rotating member 5 to which power is transmitted from the prime mover 2 via the friction engagement clutch 4, and a second rotating member 6 that is coaxially disposed adjacent to the first rotating member 5. With. The first rotating member 5 and the second rotating member 6 are provided so as to be relatively rotatable by a predetermined angle. The second rotating member 6 is connected to the input shaft 3 a of the transmission 3.

  As shown in FIG. 2, the first rotating member 5 and the second rotating member 6 are configured to transmit power via a coil spring 7. The coil spring 7 absorbs fluctuations in torque output from the prime mover 2. The mark in FIG. 2 indicates the viewpoint in FIG.

  As shown in FIG. 3, in the torque fluctuation absorber 1 of this embodiment, four coil springs 7 are arranged at equal intervals in the circumferential direction.

  Further, as shown in an enlarged view in FIG. 4, a friction force adjusting mechanism 8 that adjusts a friction force generated between the first rotating member 5 and the second rotating member 6 is provided between the first rotating member 5 and the second rotating member 6. This frictional force adjusting mechanism 8 is also called a hysteresis mechanism. The mark in FIG. 4 indicates the viewpoint in FIG.

  The friction force adjusting mechanism 8 includes a washer 9 fixed so as to rotate integrally with the first rotating member 5, and the washer 9 and the first rotating member so as to be rotatable relative to the first rotating member 5 by a certain angle. 5 and an adjustment member 10 provided between the washer 9 and the adjustment member 10, and an elastic member 11 made of a disc spring.

  A friction material 9 a is provided on the surface of the washer 9 on the side facing the second rotating member 6. A plurality of projecting pieces 9 b extending toward the first rotating member 5 are provided on the outer peripheral edge of the washer 9. Each of the projecting pieces 9b is inserted into a fixing portion 5a formed of a plurality of through holes formed in the first rotating member 5. Thus, the washer 9 is fixed to the 1st rotation member 5 by engaging the protrusion piece 9b with the fixing | fixed part 5a in the circumferential direction.

  The second rotating member 6 includes a cylindrical hub 6a in the radially inner portion that is the center of rotation. A male screw portion 6b is provided on the outer peripheral surface of the hub 6a. The adjusting member 10 has a disc shape and is provided with an insertion hole 10a through which the hub 6a is inserted. A female screw is formed on the inner peripheral surface of the insertion hole 10a and is screwed to the male screw portion 6b.

  A plurality of regulating pieces 10 b extending toward the first rotating member 5 are provided on the outer peripheral edge of the adjustment member 10. The fixing portion 5a formed of a through hole is greatly opened radially inward so as to have a space radially inward of the inserted projecting piece 9b. The restricting piece 10b is inserted into the radially inner space of the fixed portion 5a.

  The restricting piece 10b is formed smaller than the circumferential width of the fixed portion 5a. The circumferential width of the regulating piece 10b with respect to the fixed portion 5a is set so that the adjusting member 10 can rotate relative to the first rotating member 5 by a certain angle.

  As shown in FIG. 5A, when a vehicle equipped with the torque fluctuation absorber 1 of this embodiment is accelerated and acceleration torque is input to the torque fluctuation absorber 1, a torsion torque is generated and the first rotating member is generated. 5 and the second rotating member 6 are moved relative to each other so as to be twisted, and the regulating piece 10b moves from the position on the left side of the fixing portion 5a toward the right side of the drawing. However, the relative phase between the regulating piece 10b and the second rotating member 6 is not changed, and the state shown in FIG. 4B can be maintained.

  On the other hand, as shown in FIG. 5B, when the vehicle decelerates and the deceleration torque is input to the torque fluctuation absorber 1, the torsion torque is generated and the first rotating member 5 and the second rotating member 6 are twisted. Move relative to each other. And although the control piece 10b tends to rotate with the 2nd rotation member 6, it is caught in the fixing | fixed part 5a and cannot rotate with the 2nd rotation member 6. FIG. For this reason, the regulation piece 10b moves from the state of FIG. 4B to the state of FIG. 4A by the screwing of the male screw part 6b and the insertion hole 10a. Thereby, in the state where the vehicle is decelerating, the frictional force between the first rotating member 5 and the second rotating member 6 is reduced, and the torque fluctuation absorbing device reduces the fluctuation of the torque transmitted from the driving wheels of the vehicle. 1 can be absorbed flexibly. In other words, when the first rotating member 5 rotates at a reduced speed with respect to the second rotating member, the adjusting member 10 is screwed into the male screw portion 6 b so as to be separated from the washer 9.

  When the vehicle shifts from a deceleration state to a normal state (inertia running (coasting) state) or an acceleration state, the regulating piece 10b is pushed by the fixing portion 5a of the first rotating member 5, and the male screw portion 6b and the insertion hole Returning to the state of FIG. 4B by screwing with 10a.

  According to the torque fluctuation absorber 1 of this embodiment, when deceleration torque is input, the frictional force (hysteresis) between the first rotating member 5 and the second rotating member 6 can be reduced. And even if it changes the frictional force between the 1st rotation member 5 and the 2nd rotation member 6, the adjustment member 10 and the elastic member 11 maintain the state which contact | abutted uniformly over the perimeter. This can prevent uneven wear such that the portion corresponding to the contact portion as in the conventional product is heavily worn. Therefore, according to the torque fluctuation absorber 1 of the present embodiment, uneven wear of the contact surface of the friction force adjusting mechanism 8 can be suppressed, and the durability of the torque fluctuation absorber 1 can be improved.

  In the present embodiment, the dual clutch transmission is shown as the transmission in FIG. 1, but the transmission to which the torque fluctuation absorber 1 of the present invention is connected is not limited to this. For example, a belt-type continuously variable transmission, a crank-type continuously variable transmission, a toroidal-type continuously variable transmission, a parallel shaft-type multi-stage transmission, or a planetary gear-type multi-stage transmission may be used.

  Moreover, in this embodiment, although demonstrated using the disc spring as an elastic member, the elastic member of this invention is not restricted to a disc spring, A washer can be pressed against a 2nd rotation member between a washer and an adjustment member. Others may be used if possible.

DESCRIPTION OF SYMBOLS 1 Torque fluctuation absorber 2 Motor | power_engine 3 Transmission 3a Input shaft 4 Friction engagement clutch 5 1st rotation member 5a Fixing part 6 2nd rotation member 6a Hub 6b Male thread part 7 Coil spring 8 Friction force adjustment mechanism 9 Washer 9a Friction material 9b Projection piece 10 Adjustment member 10a Insertion hole 10b Restriction piece 11 Elastic member

Claims (2)

A rotatable first rotating member;
A second rotating member disposed coaxially adjacent to the first rotating member in the axial direction;
A hub extending from a radially inner portion of the second rotating member toward the first rotating member;
A male screw portion provided on the outer peripheral surface of the hub;
A washer disposed between the first rotating member and the second rotating member;
An adjustment that is disposed between the first rotating member and the washer, is engaged with the first rotating member so as to be rotatable at a predetermined angle, and is threadably engaged with the male screw portion. Members,
An elastic member disposed between the washer and the adjustment member, and pressing the washer toward the second rotating member;
When a torsional torque is input between the adjusting member and the second rotating member, the adjusting member is displaced in the axial direction with respect to the washer, and the pressing load of the elastic member is changed to change the washer. And a torque fluctuation absorbing device that adjusts a frictional force generated between the second rotating member and the second rotating member. The torque fluctuation absorber according to claim 1,
The adjustment member is
When a deceleration torque is applied to the first rotating member so that the first rotating member decelerates relative to the second rotating member, the adjustment screw is screwed onto the male screw portion so as to be separated from the washer. Torque fluctuation absorber characterized by combining.