JP6515857B2 - Spring holding member of damper device - Google Patents

Description

  The present invention relates to a spring holding member of a damper device. More specifically, the present invention relates to a spring holding member for holding an end of a coil spring provided in a damper device provided in a power transmission system of a vehicle.

  The power transmission system of the vehicle is provided with a damper device for absorbing fluctuations in torque transmitted from a power source such as an engine to a power transmission device such as a transmission.

  In this type of damper device, a coil spring is interposed between a relatively rotatable first rotating member (for example, a disk plate) and a second rotating member (for example, a damper hub), and the elastic deformation of the coil spring It is designed to absorb and damp torsional vibrations due to torque fluctuations.

  Further, as disclosed in Patent Document 1, both ends in the expansion and contraction direction of the coil spring are held by a spring holding member (also referred to as a spring holding sheet). The coil spring and the spring holding member are disposed in a spring receiving hole formed in each rotating member. Further, in the damper device disclosed in Patent Document 1, the main body portion (portion where the end portion of the coil spring abuts) of the spring holding member is made of metal, and the sliding portion which is the outer peripheral portion is a composite. It is made of resin.

JP 2004-183870 A

  When the rotational speed of the engine increases and the rotational speed of the damper device increases, a large centrifugal force acts on the spring holding member, which causes the spring holding member to move to the outer peripheral side of the damper device. The spring holding member may rotate outward around the contact point of In such a situation, the holding stability of the coil spring by the spring holding member may be deteriorated. In addition, a drag occurs at the contact portion between the outer surface of the spring holding member and the rotating member (inner surface of the spring accommodation hole), and the frictional force largely fluctuates, whereby the hysteresis of the damper characteristics becomes excessive and the torque fluctuation absorbing function Can have an adverse effect on FIG. 5 is a torsion characteristic diagram showing the relationship between the input torque and the torsion angle of the damper device in the prior art. The solid line in the figure is at low rotation, and the broken line in the figure is at high rotation. As shown in FIG. 5, in the prior art, the hysteresis of the damper characteristics at the time of high rotation may be excessive to adversely affect the torque fluctuation absorbing function, and the vibration and noise suppression effect is sufficiently It may not be exhibited.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a spring holding member capable of stably holding a coil spring and well maintaining a torque fluctuation absorbing function. It is to do.

The solution according to the invention for achieving the above object is an end of a coil spring provided in a damper device that absorbs fluctuations in torque transmitted between a first rotating member and a second rotating member. Presupposes a spring holding member that holds the With respect to this spring holding member, a spring contact portion made of synthetic resin that contacts an end portion on one side in the expansion and contraction direction of the coil spring, and a metal movement restricting portion integrally provided on the spring contact portion And prepare. Then, one end of the movement restricting portion in the circumferential direction of each rotating member is coupled to the spring contact portion. On the other hand, the other end portion of the movement restricting portion in the circumferential direction of each rotating member is separated from the spring contact portion and positioned on the outer peripheral side than the coupling position of the one end portion to the spring contact portion. There is.

  Due to this particular matter, when the rotation speed of the damper device is increased and a large centrifugal force acts on the spring holding member, the other end of the metal movement restricting portion abuts on the rotating member (a spring formed on the rotating member By contacting the inner surface or the like of the accommodation hole, movement of the spring holding member to the outer peripheral side and rotation of the spring holding member to the outside centering on the contact point with the rotating member are suppressed. Further, since the movement restricting portion is made of metal and only its end (the other end) contacts the rotating member, the frictional force at the contact portion between the movement restricting portion and the rotating member is small. The fluctuation of the frictional force is also small. Therefore, the holding state of the coil spring by the spring holding member can be stably maintained, and the hysteresis of the damper characteristic can be optimized, and the torque fluctuation absorbing function can be favorably maintained.

In the present invention, the spring holding member for holding the coil spring of the damper device is provided with a synthetic resin spring contact portion to be in contact with the coil spring and a metal movement restricting portion, and one end portion of the movement restricting portion The other end portion of the movement restricting portion is separated from the spring contact portion while being coupled to the spring contact portion, and is positioned on the outer peripheral side of the coupling position of the one end portion to the spring contact portion . Thereby, the movement and rotation of the spring holding member can be suppressed, the holding state of the coil spring by the spring holding member can be stably maintained, and the torque fluctuation absorbing function can be favorably maintained.

It is the figure which fractured a part of damper system concerning an embodiment. It is sectional drawing of the damper apparatus in the position corresponding to the II-II line in FIG. It is a figure which shows a spring holding member and its arrangement position periphery. It is a figure which shows the spring holding member in a modification, and its arrangement position periphery. It is a torsion characteristic view which shows the relationship between the input torque of a damper apparatus in a prior art, and a torsion angle.

  Hereinafter, embodiments of the present invention will be described based on the drawings. In the present embodiment, a case where the present invention is applied to a spring holding member provided in a damper device disposed in a power transmission system of a vehicle (for example, a hybrid vehicle) will be described.

-Overall configuration of damper device-
FIG. 1 is a view in which a part of the damper device 1 according to the present embodiment is broken (a view seen from the direction along the center line O of the damper device 1). FIG. 2 is a cross-sectional view of the damper device 1 at a position corresponding to the line II-II in FIG.

  The damper device according to the present embodiment is, for example, interposed between a crankshaft of an engine in a hybrid vehicle and an input shaft (not shown) of a power split mechanism so as to be capable of transmitting power, and transmitted from the engine to the power split mechanism. To absorb and damp torsional vibrations caused by torque fluctuations.

  The damper device 1 includes an input plate 2 connected to the crankshaft of the engine, and a disk plate 4 connected to the input plate 2 so as to be able to transmit power through the torque limiter mechanism 3 and rotate around the center line O. A first rotating member according to the invention, and a damper hub 5 (a second rotating member according to the present invention) which is connected to the input shaft of the power split mechanism so as to be relatively non-rotatable and relatively rotatable around the disk plate 4 And a coil spring 6 made of spring steel disposed between the disk plate 4 and the damper hub 5 to allow relative rotation between the disk plate 4 and the damper hub 5 within a predetermined twist angle range; A spring holding member 7 disposed at both ends in the expansion and contraction direction and holding the end of the coil spring 6 is configured.

  The input plate 2 is composed of a pair of disc-shaped plates 21 and 22. On the outer peripheral side of the plates 21 and 22, bolt fastening holes for fastening a flywheel (not shown) connected to the crankshaft are formed. For this reason, during operation of the engine, power from the engine is transmitted to the input plate 2 via the flywheel, and the input plate 2 rotates around the center line O.

  The radial intermediate portions of the plates 21 and 22 are bent in the direction away from the opposing plates 22 and 21. Thus, a space is formed between the plates 21 and 22 to accommodate the components that constitute the torque limiter mechanism 3.

  The torque limiter mechanism 3 is provided between the input plate 2 and the disk plate 4 in the radial direction, and has a function of preventing torque transmission exceeding a preset limit torque.

  The torque limiter mechanism 3 is interposed between the pressure plate 31 and the plate 22 in the axial direction, with a disk-shaped pressure plate 31 in which a part of the outer periphery is fitted with a fitting hole formed in the plate 22. The annular lining plate 32 whose periphery is fastened to the disk plate 4 by the rivets 33, and the pressure plate 31 and the plate 21 in a direction along the center line O are disposed in a state where a preload is applied And a cone-shaped disc spring 34.

  A pair of friction members 35 are fixed, for example, by riveting or bonding on both sides of the lining plate 32 in the direction along the center line O. Therefore, the pressure plate 31 and the friction member 35 and the plate 22 and the friction member 35 function as slidable friction surfaces. The disc spring 34 presses the pressure plate 31 toward the plate 22 in the direction along the center line O with a disc spring load (the preload) set in advance.

  By thus configuring the torque limiter mechanism 3, the disc spring load of the disc spring 34, the friction coefficient of the friction surface between the pressure plate 31 and the plate 22 and the friction member 35, the effective diameter of the friction member 35 (rotation Limit torque based on the radius) is set. When a torque exceeding the limit torque is input to the torque limiter mechanism 3 configured in this way, slip occurs on the friction surface between the pressure plate 31 and the plate 22 and the friction material 35, and torque transmission exceeding the limit torque is generated. It is prevented. The limit torque is generally set to a value obtained by providing a predetermined margin from the maximum torque of the engine, and the disc spring load, the coefficient of friction, the effective diameter of the friction material 35 and the like are adjusted to obtain the limit torque. .

  The disc plate 4 includes a pair of disc-shaped first disc plates 41 (hereinafter referred to as first plate 41) and a second disc plate 42 (hereinafter referred to as second plate 42) (these plates 41 and 42 are covers And the outer periphery is fastened by means of rivets 33 together with the lining plate 32 against relative rotation with each other. Thus, the disc plate 4 rotates around the center line O with the lining plate 32.

  Three first spring receiving holes 43 for receiving the coil springs 6 are formed in the first plate 41 at equal angular intervals in the circumferential direction. Further, also in the second plate 42, three second spring receiving holes 44 for receiving the coil springs 6 are formed at equal angular intervals in the circumferential direction. The first spring accommodation hole 43 and the second spring accommodation hole 44 are formed in the same phase (position in the rotational direction) in the circumferential direction, so that the space in which the coil spring 6 is formed by the spring accommodation holes 43 and 44 Housed in

  The damper hub 5 extends radially outward from the outer peripheral portion of the cylindrical portion 51 having a cylindrical cylindrical portion 51 in which inner peripheral teeth for spline fitting the input shaft of the power split mechanism to the inner peripheral portion are formed. And a flange portion 52. The three flange portions 52 are formed at equal angular intervals in the circumferential direction, and spaces for accommodating the coil spring 6 are formed at three places between the adjacent flange portions 52 and 52. This space is located in the same phase (position in the rotational direction) as the spring accommodation holes 43 and 44.

  The coil spring 6 is disposed in a space formed between the adjacent flanges 52, 52, and both ends thereof (in the direction of expansion and contraction of the coil spring 6) by the spring holding members 7, 7 fitted with the flange 52 Both ends are held. Details of the configuration of the spring holding member 7 will be described later.

  Cylindrical cushions 61 are provided in the respective coil springs 6 so as to be movable in the coil springs 6. The cushion 61 is made of, for example, a resin to which graphite is added, or rubber, and the overall length is formed shorter than the free length of the coil spring 6.

  In the damper device 1 configured as described above, for example, the power of the engine is transmitted to the input plate 2 via a crankshaft and a flywheel (not shown). Further, this motive power is transmitted to the disk plate 4 via the torque limiter mechanism 3 and the disk plate 4 is rotated about the center line O. At this time, one end side of the coil spring 6 accommodated in the first spring accommodation hole 43 and the second spring accommodation hole 44 is pressed against the spring holding member 7. On the other hand, the other end side of the coil spring 6 is pressed against the flange portion 52 of the damper hub 5 via the spring holding member 7, and the damper hub 5 is rotated around the center line O. Thus, the rotation of the disk plate 4 is transmitted to the damper hub 5 via the coil spring 6. At this time, the coil spring 6 elastically deforms in accordance with the torque input to the disc plate 4 and transmits power to the damper hub 5, whereby vibration in the torsional direction caused by torque fluctuation is absorbed by the coil spring 6. .

-Configuration of spring holding member-
Next, the spring holding member 7 which is a member characterizing the present embodiment will be described.

  FIG. 3 is a view showing one spring holding member 7 of the pair of spring holding members 7 and 7 for holding the coil spring 6 and the vicinity of the arrangement position thereof.

  As shown in FIG. 3, the spring holding member 7 has a structure in which a spring contact portion 71 made of synthetic resin and a movement restricting portion 72 made of metal are integrally coupled.

  The spring contact portion 71 of the spring holding member 7 is formed outside the insertion portion 71 a and has a cylindrical insertion portion 71 a inserted inside the coil spring 6 (not shown in FIG. 3). And a holder 71b for holding the end. The outer diameter dimension of the insertion portion 71 a is set smaller than the inner diameter dimension of the coil spring 6. Further, a part of the holding portion 71 b is a recessed portion 71 c into which the end of the coil spring 6 is fitted. The other spring holding member 7 has a shape symmetrical to that of the spring holding member 7 shown in FIG.

  And the part which opposes the damper hub 5 in the spring holding member 7 is formed as a hub contact part, and the recessed part 71d is formed in this hub contact part. Further, a portion of the damper hub 5 facing the spring holding member 7 is formed as a seat contact portion, and a convex portion 53 is formed on the seat contact portion. Therefore, as shown in FIG. 3, when the spring holding member 7 is in contact with the damper hub 5, the convex portion 53 of the damper hub 5 is fitted in the recess 71d of the spring holding member 7. In this state, the spring holding member 7 is It is supported by the damper hub 5.

  On the other hand, the movement restricting portion 72 of the spring holding member 7 is formed by pressing a flat plate made of metal, and one end 72a (left end in FIG. 3) is coupled to the spring contact portion 71. Specifically, one end portion 72 a of the movement restricting portion 72 is embedded in the outer peripheral portion of the spring contact portion 71 and is supported by the spring contact portion 71. On the other hand, the other end 72b (right end in FIG. 3) of the movement restricting portion 72 is separated from the outer surface of the spring contact portion 71, and the coupling position of the one end 72a (coupled to the spring contact portion 71) It is located on the outer peripheral side than the position at which FIG. 3 shows a state in which the end of the other end 72 b of the movement restricting portion 72 abuts on the inner surface of the spring accommodation holes 43 and 44 of the disc plate 4. The width dimension of the movement restricting portion 72 (dimension in the direction orthogonal to the paper surface in FIG. 3) may be a dimension capable of coming into contact with the inner surfaces of the spring accommodation holes 43 and 44. Or a dimension slightly shorter than the width dimension of the spring contact portion 71.

  As a manufacturing operation of the spring holding member 7, when molding the spring contact portion 71 made of a synthetic resin with a molding die, a metal movement regulating portion 72 is disposed in the molding die, and the movement regulating portion 72 is integrated with the spring contact portion 71. Preferably, a low friction material is coated on the outer surface of the movement restricting portion 72, in particular, on the tip end of the other end 72b which abuts on the inner surfaces of the spring accommodation holes 43 and 44. For example, coating with a fluorine resin such as polytetrafluoroethylene (PTFE) can be mentioned.

  Since the spring holding member 7 is configured in this manner, even if a large centrifugal force is applied to the spring holding member 7 due to an increase in the rotational speed of the damper device 1, the metal movement restricting portion 72 The movement of the spring holding member 7 to the outer peripheral side is restricted by the other end portion 72b of the spring abuts on the inner surfaces of the spring accommodation holes 43 and 44. Further, as described above, since the movement restricting portion 72 is formed of a metal flat plate, it exerts a spring function when in contact with the inner surface of the spring accommodation holes 43 and 44 of the disk plate 4. As the amount of movement of the holding member 7 to the outer peripheral side becomes larger, the reaction force for returning the spring holding member 7 to the inner peripheral side becomes larger.

  Therefore, the outer surface of the spring contact portion 71 made of synthetic resin is prevented from coming into contact with the inner surfaces of the spring receiving holes 43, 44, and the friction force between the spring holding member 7 and the inner surface of the spring receiving holes 43, 44 Does not become large.

  As described above, in the present embodiment, when the rotational speed of the damper device 1 increases and a large centrifugal force acts on the spring holding member 7, the other end 72b of the metal movement restricting portion 72 is the disk plate 4 Specifically, by contacting the inner surfaces of the spring receiving holes 43 and 44, movement of the spring holding member 7 to the outer peripheral side, and rotation of the spring holding member 7 to the outside centering on a contact point with the damper hub 5 Motion (see the phantom line in FIG. 3) will be suppressed. Further, since the movement restricting portion 72 is made of metal and only the end (the other end 72b) abuts the disc plate 4, the frictional force at the contact portion between the movement restricting portion 72 and the disc plate 4 is It is getting smaller. For this reason, the holding state of the coil spring 6 by the spring holding member 7 is stably maintained, and the hysteresis characteristic of the damper characteristic can be optimized, and the torque fluctuation absorbing function can be favorably maintained. A large reduction effect of

  In addition, since the fall-off preventing property of the spring holding member 7 is also improved, the starting torque (torque for starting the twisting) necessary for the operation of the damper device 1 can be reduced. The noise reduction effect can be largely secured.

  Further, in the damper device 1 of this type, the coil spring 6 is bent even in a state (initial state) in which the twisting is not generated in order to ensure the drop preventing property of the coil spring 6 and the spring holding member 7. Although a constant reaction force is applied, according to the present embodiment, since the drop-preventing property of the coil spring 6 and the spring holding member 7 can be improved, the coil spring 6 is not deformed. It is possible to set a small amount of deflection necessary for the mounting of the coil spring 6 and to simplify the mounting operation of the coil spring 6 and the like.

(Modification)
Next, a modification is described. In this modification, the shape of the movement restricting portion 72 is different from that of the above embodiment. The other configuration and operation are the same as those of the embodiment described above, so only the shape of the movement restricting portion 72 will be described here.

  FIG. 4 is a view showing one spring holding member 7 of the pair of spring holding members 7 and 7 for holding the coil spring 6 in the present modification and the periphery of the arrangement position thereof.

  As shown in FIG. 4, the movement restricting portion 72 in the present modification has one end 72a (left end in FIG. 4) coupled to the spring contact portion 71 as in the embodiment described above. . Specifically, one end portion 72 a of the movement restricting portion 72 is embedded in the outer peripheral portion of the spring contact portion 71 and is supported by the spring contact portion 71. On the other hand, the other end 72b (right end in FIG. 4) of the movement restricting portion 72 is separated from the spring contact portion 71, and is coupled to the coupling position (spring contact portion 71) of the one end 72a. Position) is located on the outer peripheral side.

  Further, in the spring contact portion 71 according to the present modification, a convex portion 72c formed to be convexly curved toward the outer peripheral side is formed at the other end portion 72b (right end portion in FIG. 4). With this configuration, the curved surface which is the outer end of the convex portion 72c comes in contact with the inner surfaces of the spring receiving holes 43 and 44 of the disk plate 4, and the frictional force at this contact portion is significantly reduced. Can.

  Other configurations and operations are similar to those of the above embodiment.

  Also in this modification, the same effect as that of the embodiment can be obtained. In addition, since the frictional force at the contact portion between the convex portion 72c and the inner surfaces of the spring accommodation holes 43 and 44 of the disk plate 4 can be greatly reduced, the hysteresis of the damper characteristics can be optimized and torque fluctuation Can be well maintained, and vibration and noise reduction effects can be largely secured.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to this embodiment, In the range which does not deviate from the summary of this invention, it can implement in various forms. .

  For example, an intermediate plate is disposed between the disk plate 4 and the damper hub 5, and a series spring in which a coil spring is interposed between the disk plate 4 and the intermediate plate and between the intermediate plate and the damper hub 5 respectively. The present invention is also applicable to a damper device of the formula.

  The present invention is applicable to a spring holding member for holding an end of a coil spring provided in a damper device provided in a power transmission system of a vehicle.

1 Damper device 4 Disc plate (first rotating member)
5 Damper hub (second rotating member)
6 coil spring 7 spring holding member 71 spring contact portion 72 movement restricting portion 72a one end 72b other end

Claims (1)

A spring holding member for holding an end of a coil spring provided in a damper device for absorbing fluctuations in torque transmitted between a first rotation member and a second rotation member,
A spring contact portion made of synthetic resin which contacts an end of one side of the coil spring in the expansion and contraction direction;
And a metal movement restricting portion integrally provided on the spring contact portion,
One end of the movement restricting portion in the circumferential direction of each rotating member is coupled to the spring contact portion,
The other end of the movement restricting portion in the circumferential direction of each rotating member is spaced apart from the spring contact portion, and is located on the outer peripheral side of a coupling position of the one end portion to the spring contact portion . Spring holding member characterized by the above.

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