JP4760952B2 - Torsion damper - Google Patents

Description

  The present invention relates to a torsion damper of a torsional vibration absorber, and more particularly to a vibration absorber used in a flywheel, a clutch disk or a drive shaft system in order to absorb torque fluctuations of a combustion engine and an electric motor. It relates to torsion dampers.

  As a conventional torsion damper for a torsional vibration absorber, there is a torsion damper disclosed in Japanese Patent Application Laid-Open No. 9-229138. This torsion damper is loosely fitted inside a coil spring arranged in the relative rotational direction as an elastic means arranged between a drive plate connected to a drive source and a driven plate connected to a driven source. A substantially cylindrical cushion molded from an elastic resin material. The outer diameter guide portion of the torsion damper is formed smaller than the inner diameter of the coil spring by a predetermined clearance in order to allow smooth expansion and contraction of the coil spring. In addition, the central portion is formed to have a smaller diameter than both ends so that the portion deformed outward by compression when the torsion damper is compressed does not contact the coil spring.

JP-A-9-229138

  However, the torsion damper disclosed in Patent Document 1 has a configuration in which the central portion is made small in diameter in consideration of deformation of the central portion during compression and the guide portions are provided at both ends, so that the length of the necessary elastic portion is secured. And there was a limit in ensuring the length of the guide portion in the axial direction.

  On the other hand, torsional vibration absorbers such as flywheel dampers and clutch discs equipped with such torsion dampers have an increased relative torsion angle between the drive plate and the driven plate for higher torque performance, etc. There is a need to shorten the length or to set the winding pitch of the coil spring used in the damper mechanism large. In addition, in the coil spring in which the spring characteristics are variable depending on the compression amount, the winding pitch is made unequal, and there is a place where the winding pitch is set large.

  In these cases, as shown in FIG. 8, the torsion damper 110 may fall into the gap d between the coil springs when not compressed, and the torsion damper may be destroyed when the coil spring 10 is compressed.

  Therefore, it is a technical object of the present invention to provide a torsion damper for a torsional vibration absorbing device that solves the above-described problems.

In order to solve the above problem, the technical means taken in claim 1 is a coil spring disposed in a window hole provided in a drive plate connected to a drive source and a driven plate connected to a driven source. And a guide portion formed with a predetermined clearance with respect to the inner diameter of the coil spring, and the drive plate and the driven plate directly to the driven plate during relative rotation of the drive plate and the driven plate at a predetermined angle. A torsion damper having a cushion portion that abuts on the target or indirectly and transmits an impact torque between the drive plate and the driven plate, wherein the torsion damper is formed of an elastic resin, and is formed at both ends in the circumferential direction of the window hole. The torches against the seats supporting both axial ends of the coil springs Ndanpa disposed said window hole with a gap in the circumferential direction, said along with the guide portion to the inside and integrally with the cushion portion of the guide portion is formed, the axis between the guide portion and the cushion portion A space extending in the direction was formed.

  According to the first aspect of the present invention, in the torsion damper, the drive plate and the driven plate are indirectly or directly brought into contact with each other and compressed to transmit torque between the drive plate and the driven plate. The cushion part that reduces the shock (impact torque) is arranged on the inside, and the guide part of the torsion damper is arranged on the outside, so there is sufficient space between the coil springs and the clearance between the coil springs. It is possible to provide a torsion damper that can be provided with a guide portion having a length and that is prevented from falling into the clearance between the coil springs. In addition, since the cushion portion is provided inside the torsion damper, a space can be arranged between the cushion portion and the guide portion in consideration of deformation due to compression of the torsion damper. Even if the cushion portion is compressed, the guide portion There is no effect on the outer diameter.

It is a figure which shows one Embodiment of the torsional vibration absorber using the torsion damper of this invention. It is XX sectional drawing of FIG. It is the front view and sectional view (AA) which show one implementation of the torsion damper concerning the present invention. It is sectional drawing which shows other implementation of the torsion damper concerning this invention. It is sectional drawing which shows other implementation of the torsion damper concerning this invention. It is a side view which shows other implementation of a torsion damper. It is a side view which shows other implementation of a torsion damper. It is a figure which shows the malfunction of the conventional torsion damper.

  1 and 2 show a disk damper 1 which is an example of a torsional vibration absorber disposed between an engine and a transmission of a vehicle to which the torsion damper of the present invention is applied. 1 is a front view in which a part of a disk damper is cut away, and FIG. 2 is a sectional view taken along line XX in FIG. Friction members 21 and 22 which are bonded and fixed to both sides of the outer periphery of the disk damper 1 (which can also be fixed by rivets) are connected to a flywheel (not shown) connected to a crankshaft of an engine as a drive source; It is clamped by a pressure plate (not shown) biased by a disc spring of a limiter that serves to limit the transmission torque bolted to the wheel, and rotates integrally with the flywheel by friction engagement. On the other hand, the hub 30 of the disk damper 1 is spline-fitted to an input shaft (not shown) of a transmission that is a driven element (driven source). Accordingly, the disk damper 1 transmits torque generated between the flywheel and the input shaft.

  The hub 30 of the damper disk 1 has a flange portion 31 extending in the radial direction. On the outer peripheral portion of the flange portion 31, accommodating portions 32 for accommodating the coil springs 10 are formed at a plurality of locations (four equally spaced locations) on the circumference, and the coil springs 10 are disposed at both ends of the accommodating portion 32 via seats 40. To accommodate. Then, the torsion damper 100 is loosely inserted into the coil spring 10. Further, the coil spring 10 is pressed through the seat 40 by the wall 33 of the housing portion 32 when the hub rotates.

  Friction materials 21 and 22 are caulked and fixed by rivets on both surfaces of the outer peripheral portion of the drive plate 51 of the disk damper 1. Further, the drive plate 51 is caulked and fixed by a sub drive plate 52 and a rivet 53 on the inner peripheral side of the friction materials 21 and 22, and the drive plate 51 and the sub drive plate 52, the flange portion 31 of the hub 30, and the coil The spring 10 is sandwiched. The drive plate 51 and the sub drive plate 52 are pivotally supported by the hub 30 so as to be relatively coaxial with each other via a bush and a thrust member 60 that also serve as bearings. The integrally formed drive plate 51 and sub drive plate 52 correspond to the accommodating portion 32 that accommodates the coil spring 10 formed in the flange portion 31 of the hub 30 and extends in a substantially circumferential direction or a tangential direction. Holes 54 and 55 are formed to accommodate the coil spring 10 via the seat 40. The window holes 54 and 55 also press the coil spring 10 through the seats 40 at the walls 56 and 57 when the drive plate 51 rotates, similarly to the housing portion of the hub 30.

  The torque transmission of the damper disk 1 configured as described above will be described. The torque transmitted from the engine or motor to the flywheel during acceleration of the automobile is applied to the drive plate 51 and the sub drive plate 52 by the frictional engagement force generated when the friction materials 21 and 22 are sandwiched between the flywheel and the pressure plate. As a result, relative rotation occurs between the drive plate 51 and the hub 30, and the walls 56 and 57 of the window holes 54 and 55 press one end of the coil spring 10 through the seat 40 to compress the coil spring 10. The other end of the compressed coil spring 10 presses the wall 33 of the housing portion 32 formed on the flange portion 31 of the hub 30 via the seat 40 by a restoring force, and transmits torque to the hub 30. Torque is input to the input shaft of the transmission. On the other hand, reverse torque generated at the time of deceleration or the like is also transmitted from the hub 30 to the drive plate 51 through the coil spring 10 through the reverse path.

  Furthermore, in torque transmission, the relative rotation between the drive plate 51 and the hub 30 increases due to a sudden torque fluctuation generated between the engine and the input shaft due to a shift change of the automobile or a sudden torque increase generated by the drive source. In this case, when the relative rotation proceeds and the relative rotation angle reaches a predetermined value, the contact portions 41 of the sheets disposed at both ends of the coil spring 10 and the torsion damper 100 abut, and the torsion damper 100 is elastically deformed. The torque is transmitted via the torsion damper 100. Further, the peak value of the impact torque generated at the time of contact is suppressed by the elasticity of the torsion damper 100.

  The torsion damper 100 which is a main part of the present invention will be described in detail. The torsion damper 100 is a generally cylindrical cushion that is injection-molded from an elastic resin (for example, a thermoplastic polyester elastomer or the like is fried). The outer diameter of the torsion damper 100 is smaller than the inner diameter of the coil spring 10 (for example, about 0.6 mm smaller in diameter) and is loosely inserted into the coil spring 10. When the relative rotation between the drive plate 51 and the hub 30 reaches a predetermined value, the torsion damper 100 abuts against the abutting portion 41 of the seat and elastically deforms to transmit torque, and at the time of abutment due to the elasticity of the torsion damper 100 Relieve shock. In addition, the small diameter portion is formed in consideration of the amount of deformation when compressed.

  Hereinafter, embodiments of the torsion damper will be described.

  FIG. 3 shows the shape of the torsion damper 300, FIG. 3 (a) is a front view, and FIG. 3 (b) is a cross-sectional view taken along line AA of FIG. In the torsion damper 300, guide portions 301 are set at both ends in consideration of a clearance between coil springs, and a space 303 extending circumferentially through the cushion portion 302 and penetrating in the axial direction is formed at one end. Four places are formed. When the torsion damper 300 is compressed, the deformed portion enters the space 303 and the change in the outer diameter of the guide portion 301 is suppressed.

  FIG. 4 shows a cross-sectional view of a torsion damper 400 according to another embodiment. Guide portions 401 are set at both ends in consideration of a clearance between coil springs, and the center side of the guide portion 402 and the cushion portion 402 are arranged. A space 403 is provided on the circumference between the two.

  FIG. 5 shows a cross-sectional view of another embodiment of a torsion damper 500. The guide portion 501 extends from the center portion with the cushion portion 502 in consideration of the clearance between the coil springs, and is formed at both ends. An open space 504 is provided.

  FIG. 6 shows a side view of a torsion damper 600 according to another embodiment, in which a rib 604 having the same outer diameter as the outer periphery of the guide portion from the guide portions 601 at both ends is directed to four locations at one end and a coil spring. It is formed so as not to fall into the gap. Further, when the torsion damper 600 is compressed, a portion where the rib 604 is not formed allows a deformed portion, and deformation of the guide portion 601 is suppressed.

  FIG. 7 shows a side view of another embodiment of a torsion damper 700, in which a rib 704 extends from a guide portion 701 at one end to a multi-end guide portion 701, a notch is provided at the center, and the rib A portion where 704 is not formed allows the deformed portion, and deformation of the guide portion 701 is suppressed.

  As mentioned above, although the shape of the torsion damper of a plurality of the present invention was illustrated, the shape is not limited to these, and if the configuration and shape are based on the present invention and take into account the clearance between the coil springs, the present invention Within the scope of

DESCRIPTION OF SYMBOLS 1 ... Torsional vibration absorber 10 ... Coil spring 40 ... Sheet 41 ... Contact part 110,100,200,300,400,500,600,700 ... Torsion damper 101,201, 301, 401, 501, 601, 701... Guide portion 102, 202, 302, 402, 502, 602, 702... Cushion portion

Claims (4)

The coil plate is loosely inserted into a coil spring disposed in a window hole provided in a drive plate connected to the driving source and a driven plate connected to the driven source, and has a predetermined clearance with respect to the inner diameter of the coil spring. A guide portion formed with
A cushion portion that directly or indirectly abuts the drive plate and the driven plate and transmits an impact torque between the drive plate and the driven plate when the drive plate and the driven plate are rotated at a predetermined angle;
In a torsion damper having
The torsion damper is formed of an elastic resin, and the torsion damper is disposed in the window hole with a gap in the circumferential direction with respect to a sheet that supports both ends in the axial direction of the coil spring at both ends in the circumferential direction of the window hole.
The torsion characterized in that the cushion part is formed integrally with the guide part inside the guide part, and a space extending in the axial direction is formed between the guide part and the cushion part. damper. The torsion damper according to claim 1, wherein a space extending in the axial direction between the guide part and the cushion part penetrates in the axial direction of the torsion damper. The space extending in the axial direction between the guide part and the cushion part is formed between an axially central side of the guide part and an outer periphery of the cushion part. The torsion damper described in 1. The guide part is formed to extend from the axial center part of the torsion damper with the cushion part, and the space is provided to be open at both axial ends of the torsion damper. The torsion damper described in 1.

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