JP2009079770A - Torque fluctuation absorber - Google Patents

Abstract

A torque fluctuation absorber that suppresses vibration as much as possible even when the torsional characteristics change due to centrifugal force and is advantageous in terms of the number of parts and space.
A driving side rotating member, a driven side rotating member arranged coaxially with the driving side rotating member on the inner diameter side of a guide surface, and an outer periphery of the driven side rotating member. The first torsion is disposed in the circumferential space between the torque receiving portion formed on the guide surface and the guide surface 221, and the end portion is supported by the first sheet member slidably guided by the guide surface 221. A torque fluctuation absorbing device 210 including a member, and having a side surface portion extending along both side surfaces of the torque receiving portion and a connecting portion for connecting the side surface portions on the negative end surface side of the torque receiving portion. A second torsion member that is elastic in the direction is fixed.
[Selection] Figure 1

Description

  The present invention relates to a torque fluctuation absorbing device interposed in a drive system of an automobile or the like.

  Conventionally known torque fluctuation absorbers are devices that absorb torque fluctuations via a torsion member such as a coil spring between a drive plate and a driven plate that can rotate relative to the drive plate. For example, when the engine rotates at a high speed, the drive plate rotates at a high speed and the centrifugal force applied to the sheet that supports the coil spring disposed in the drive plate increases, and the contact between the outer peripheral surface of the sheet and the driven plate Increases sliding resistance. In this state, when the torque fluctuation is small, the driven plate cannot bend the coil spring. For example, it is considered that the torque fluctuation is not absorbed and the vibration of the engine is not absorbed. .

In order to solve this problem, various measures have been taken conventionally. For example, in EP0236159A1, an auxiliary plate is sandwiched between two driven plates, holes are provided in the driven plate and the auxiliary plate, and a coil spring is provided in the holes. When absorbing torque fluctuations, the spring seat and the driven plate first come into contact with each other. A torque fluctuation absorbing device is disclosed that can absorb torque fluctuation regardless of centrifugal force during high-speed rotation by bending a coil spring in a hole that is not easily affected by centrifugal force.
EP0236159A1

  However, the technique disclosed in the above publication is not preferable because the auxiliary plate is sandwiched between the two driven plates, which makes the configuration complicated and increases the number of parts. Furthermore, since the circumferential length of the auxiliary plate is longer than the circumferential length of the driven plate, there is a problem that the mounting space becomes large.

  In view of the above circumstances, the present invention provides a torque fluctuation absorber that suppresses vibration as much as possible even when the torsional characteristics change due to centrifugal force, and is advantageous in terms of the number of parts and space. This is a technical issue.

  In order to solve the above-mentioned problems, the invention of claim 1 is a drive-side rotary member that rotates integrally with the engine and has a guide surface facing radially inward, and coaxial with the drive-side rotary member on the inner diameter side of the guide surface. And a driven rotation member disposed so as to be relatively rotatable, and a relative rotation when the rotation torque of the drive rotation member is larger than the rotation torque of the drive rotation member. A torque receiving portion having a positive end surface that receives torque sometimes, a negative end surface opposite to the positive end surface, and a circumferential space between the torque receiving portion and the guide surface, and is slid by the guide surface. A first torsion member having an end portion supported by a first sheet member that is movably guided, and a negative end surface of the torque receiving portion is provided along both side surfaces of the torque receiving portion. Between the side part that extends And a connecting portion for connecting, the second torsion member Tamachijimi circumferentially and the torque fluctuation absorbing apparatus is fixed.

  According to a second aspect of the present invention, the first sheet member and the negative end surface of the torque receiving portion are brought into contact with each other when the amount of elasticity in the circumferential direction of the second torsion member reaches a predetermined amount.

  According to a third aspect of the present invention, in the first aspect, the side surface portion of the second torsion member has a trapezoidal shape having a bottom surface as a surface fixed to the torque receiving portion side and a top surface as a surface facing the first sheet member. I did it.

According to the first aspect, when the first sheet member is pressed against the guide surface during high-speed rotation of the apparatus, the sliding resistance between the first sheet member and the guide surface is large, and the torque fluctuation is small. Sometimes when the engine brake is operated to receive torque on the negative end surface of the torque receiving portion, the first seat member is not slid even if the torque receiving portion of the driven side rotating member comes into contact with the first seat member. The second torsion member comes into contact with the first sheet member before the first sheet member comes into contact with the torque receiving portion, and the torque fluctuation is absorbed by the second torsion member. As a result, even if the torque receiving portion does not transmit the torque fluctuation enough to slide the first sheet member due to the centrifugal force, the torque fluctuation can be absorbed by the second torsion member. The vibration and noise of the device can be suppressed as much as possible.

  Further, according to the first aspect, the second torsion member is simply fixed to the negative end surface of the torque receiving portion, the increase in the number of parts is suppressed, the structure is relatively simple, and the mounting space is large. It will never be. Further, by providing the connecting portion for connecting the side portions, it is possible to prevent the side portions from buckling when absorbing torque fluctuations on the negative end surface side.

  According to the second aspect of the present invention, it is possible to arbitrarily set the torsional characteristics of the torque fluctuation absorber by defining the amount of elastic force of the second torsion member.

  According to the third aspect, the side surface portion of the second torsion member has a larger area on the side fixed to the torque receiving portion than the surface facing the first sheet member, so that the torque fluctuation on the negative end surface of the torque receiving portion. Improves absorption capacity.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings of the present embodiment, hatching indicating a cross section is omitted because the drawing is difficult to see. FIG. 1 is a longitudinal sectional view of the torque fluctuation absorber in the present embodiment, and FIG. 2 is a partially cutaway side view when FIG. 1 is viewed from the right side. In the present embodiment, a description will be given assuming that the torque fluctuation absorber is used in a flywheel damper of an automobile. The torque fluctuation absorber 210 includes a driving side rotating member 220 and a driven side rotating member 230. The drive-side rotating member 220 includes a first drive plate 221, a second drive plate 222, a ring gear 223, an inner plate 224, and spacers 225 and 226 as main components. The cylindrical portion of the outer peripheral portion of the first drive plate 221 forms a guide surface 221a by the inner periphery thereof. The first drive plate 221 and the second drive plate 222 are welded at the outer periphery, and the ring gear 223 is welded to the first drive plate 221. The first drive plate 221, the inner plate 224, and the spacers 225 and 226 are connected by rivets, and bolts (not shown) are inserted into the axial holes formed in the first drive plate 221, the inner plate 224, and the spacers 225 and 226 and screwed to the engine output shaft (not shown) Is combined with the engine.

  The driven side rotating member 230 includes a driven disk 231 positioned between the first drive plate 221 and the second drive plate 222 in the axial direction, and a flywheel 234 coupled to the driven disk 231 by a bolt 233. . On the outer periphery of the driven disk 231, there are a positive end face 232a and a positive end face 232a that receive torque during relative rotation when the rotational torque of the drive plates 221 and 222 is greater than the rotational torque of the driven disk 231, and a negative end face 232b on the opposite side. A torque receiving portion 232 is formed. The flywheel 234 is rotatably supported by an inner plate 224 via a ball bearing 240. The flywheel 234 has a friction surface for a friction clutch (not shown) that intermittently transfers torque between the engine and a transmission (not shown).

  A circumferential space 250 is formed between the guide surface 221 a of the first drive plate 221 and the outer periphery of the driven disk 231. In this space 250, the torque receiving portion 232 of the driven disk 231 is installed between a pair of torque transfer members 227 and 228 coupled to the drive plates 221 and 222 by rivets.

  A plurality of first sheet members slidably guided by guide surfaces 221a of the first drive plate 221 in the two circumferential spaces 250 between the torque transfer members 227 and 228 and the torque receiving portion 232, respectively. A first coil spring 270 that is a first torsion member supported at both ends by 260 is installed in series in the circumferential direction. With this configuration, each of the first coil springs 270 is prevented from coming into contact with the cylindrical portion of the first drive plate 221 due to centrifugal force and being worn and damaged. Protruding portions that protrude from the two first sheet members 260 that support both ends of each first coil spring 270 to the inner peripheral side of the first coil spring 270 correspond to an increase in the amount of deflection of the first coil spring 270. By approaching and abutting each other, the amount of bending of the first coil spring 270 is limited to prevent the first coil spring 270 from sticking. The torque delivery members 227 and 228 and the torque receiving portion 232 are brought into contact with each other via the first sheet member 260, whereby the maximum twist angle between the driving side rotating member 220 and the driven side rotating member 230 is defined. Is done.

  The rotational direction of the engine is a positive rotational direction indicated by an arrow F in FIG. 2 and coincides with the direction of rotational torque acting between the driving side rotating member 220 and the driven side rotating member 230. Further, the direction of the engine brake torque acting between the driving side rotating member 220 and the driven side rotating member 230 coincides with the negative rotation direction indicated by the arrow R in FIG.

  Between the driving side rotating member 220 and the driven side rotating member 230, two hysteresis mechanisms 281 and 282 that generate a predetermined friction resistance torque with respect to relative rotation of both members are interposed.

  3 is a C view of the torque receiving portion 232 of FIG. 2, and FIG. 4 is a D view of FIG. A plate member 290 is coupled to both side surfaces of the torque receiving portion 232 by rivets, and a rubber elastic body 271 as a second torsion member protruding in the circumferential direction is attached to the negative end surface 232b side of the plate member 290. ing. The rubber elastic body 271 has a side surface portion 271a extending along the plate member 290 and a connecting portion 271b for connecting the side surface portions 271a, and can be elastically compressed in the circumferential direction. The side surface portion 271a of the rubber elastic body 271 has a trapezoidal shape with the surface fixed on the torque receiving portion 232 side being the bottom surface and the surface facing the first sheet member 260 being the top surface, and the bottom surface is the plate member 290. The side surface portion 271a is fixed to the plate member 290 by covering the circumferential end of the plate member 290.

  An operation relating to the rubber elastic body 271 in the present embodiment will be described. During engine braking, torque in the negative rotation direction R is transmitted from the driven-side rotating member 230 to the driving-side rotating member 220. However, when the engine rotates at a high speed, the first seat member 260 acts on the guide surface 221a due to centrifugal force. Cannot slide. In this state, the rubber elastic body 271 having a configuration that is not affected by the change of the sliding frictional resistance due to the centrifugal force is bent to absorb the torque fluctuation. When the amount of elasticity in the circumferential direction of the rubber elastic body 271 reaches a predetermined amount, the outer diameter portion of the first sheet member 260 and the outer diameter portion of the negative end surface 232b of the torque receiving portion 232 come into contact with each other. When the torque fluctuation in the negative rotation direction exceeds the predetermined torque and becomes larger than the sliding friction resistance between the first sheet member 260 and the guide surface 221a, the first coil spring 270 is bent and absorbs the torque fluctuation.

  According to the present embodiment, torque fluctuation can be absorbed by the rubber elastic body 271, so that vibration and noise of the torque fluctuation absorber 210 can be suppressed as much as possible, and the negative end surface 232 b of the torque receiving portion 232 can be suppressed. This is a simple configuration in which only the rubber elastic body 271 is fixed, the increase in the number of parts is suppressed, the structure is relatively simple, and the mounting space is not increased. Further, by providing the connecting portion 271b for connecting the side surface portion 271a, it is possible to prevent the side surface portion 271a from buckling when absorbing torque fluctuations on the negative end surface 232b side. Further, since the side surface portion 271a has a larger area on the side fixed to the torque receiving portion 232 than the surface facing the first sheet member 260, the torque variation absorbing capability of the negative end surface 232b of the torque receiving portion 232 is increased. improves.

It is a longitudinal cross-sectional view of the torque fluctuation absorber in embodiment of this invention. FIG. 2 is a partially cutaway side view seen from the right side of FIG. 1. FIG. 3 is a C view of the torque receiving portion of FIG. 2. FIG. 4 is a D view of FIG. 3.

Explanation of symbols

210 ... Torque fluctuation absorber 220 ... Driving side rotating member 221 ... First drive plate 221a ... Guide surface 222 ... Second drive plate 230 ... Driven side rotating member 231 ... -Driven disk 232 ... Torque receiving part 260 ... First sheet member 270 ... First coil spring (first torsion member)
271 ... Rubber elastic body (second torsion member)
290 ... Plate member

Claims (3)

A drive-side rotating member that rotates integrally with the engine and has a guide surface facing radially inward;
A driven-side rotating member disposed coaxially with the driving-side rotating member and relatively rotatable on the inner diameter side of the guide surface;
A positive end surface formed on the outer periphery of the driven side rotating member and receiving torque during relative rotation when the rotational torque of the driving side rotating member is larger than the rotational torque of the driven side rotating member, and a side opposite to the positive end surface A torque receiving portion having a negative end surface of
A first torsion member disposed in a circumferential space between the torque receiving portion and the guide surface and having an end supported by a first sheet member slidably guided by the guide surface;
A torque fluctuation absorber comprising:
A second torsion member having a side surface portion extending along both side surfaces of the torque receiving portion and a connecting portion connecting the side surface portions on the negative end surface side of the torque receiving portion and elastically contracting in the circumferential direction. The torque fluctuation absorber is characterized by being fixed.   2. The torque fluctuation absorber according to claim 1, wherein when the amount of elasticity in the circumferential direction of the second torsion member reaches a predetermined amount, the first sheet member comes into contact with the negative end surface of the torque receiving portion.   The side surface portion of the second torsion member has a trapezoidal shape with a surface fixed to the torque receiving portion side being a bottom surface and a surface facing the first sheet member being an upper surface. Torque fluctuation absorber.

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