JP2012167788A - Device for reducing torsional vibration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for reducing torsional vibration that improves fastening strength between a damper mechanism and a drive plate, while maintaining damping effect of the damper mechanism.SOLUTION: The device for reducing torsional vibration is configured such that an input side member 17 and an output side member 18 are coupled to each other via a plurality of elastic bodies 19 aligned in a rotational direction so as to be relatively rotatable; and a drive plate 14 for transmitting a torque to the input side member 17 is connected at a part on an outer peripheral side in a radial direction thereof. In the device for reducing torsional vibration, the drive plate 14 includes a tongue-like protrusion piece 23 extruding between elastic bodies and fastened to the input side member 17, wherein the protrusion piece 23 is fastened to the input side member 17 by a plurality of bolts 24 penetrating in a thickness direction of the protrusion piece.

Description

  In the present invention, the input side member and the output side member are connected so as to be relatively rotatable, and an elastic body that elastically deforms when these members rotate relative to each other, that is, when torsion occurs, is provided. The present invention relates to a torsional vibration reducing device arranged therebetween.

  Torsional vibration is reduced when output torque changes periodically due to intermittent power generation, or when inevitable vibration occurs with rotation due to a shift in the center of gravity. A device such as a damper is used. A fluid coupling such as a torque converter or a fluid transmission device is known as a device having the same function. For example, in Patent Document 1, a drive plate (drive plate) attached to a crankshaft is disposed opposite to an outer surface on the engine side of a front cover where a lock-up clutch is brought into frictional contact with an inner surface. A drive device is described in which a cover is connected via a damper mechanism.

JP 2010-138879 A

  The damper mechanism provided to suppress the torsional vibration of the rotating body can improve the damping effect by lowering the rigidity of the elastic body constituting the damper mechanism. In addition, when the rigidity of the elastic body is lowered, the amount of displacement of the elastic body with respect to the input torque increases, so that a region allowing the displacement of the elastic body is required. Therefore, the damper mechanism is unavoidably provided on the outer peripheral side of the drive plate. On the other hand, in order to obtain strength for fastening the damper mechanism and the drive plate, it is preferable to fasten the damper mechanism on the outer peripheral side of the drive plate. Therefore, when it is configured to improve both the damping effect and the fastening strength of the damper mechanism, the fastening portion that fastens the damper mechanism and the drive plate is located between the locations where the elastic body is disposed in the circumferential direction of the drive plate. It will be between.

  Thereby, the fastening portion of the drive plate becomes a tongue-like protruding piece portion that extends between the elastic bodies and is fastened to the damper mechanism, and the protruding piece portion has a width direction length from the outer diameter side. Also, the inner diameter side is formed short. Therefore, when deformation of the drive plate occurs with the fastening portion with the crankshaft and the fastening portion with the damper mechanism as a fulcrum, stress concentrates on the inner diameter side of the protruding piece portion having a short width in the width direction. There exists a possibility that fastening strength may fall.

  The present invention has been made paying attention to the above technical problem, and an object thereof is to provide a torsional vibration reducing device that improves the fastening strength between the damper mechanism and the drive plate while maintaining the damping effect of the damper mechanism. It is what.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an input side member and an output side member are connected to each other via a plurality of elastic bodies arranged in the rotation direction so as to be relatively rotatable, In the torsional vibration reduction device in which the drive plate for transmitting torque is connected at the outer peripheral side in the radial direction, the drive plate extends between the elastic bodies and is fastened to the input side member A torsional vibration reducing device comprising a piece-like protruding piece portion, the protruding piece portion being fastened to the input side member by a plurality of bolts penetrating in the thickness direction.

  According to a second aspect of the present invention, in the first aspect of the invention, the plurality of bolts include at least two bolts arranged in a circumferential direction of the drive plate, and the drive plate with respect to the two bolts. A torsional vibration reducing device including another bolt arranged at a position shifted in the radial direction.

  According to the present invention, the input side member and the output side member are connected to each other via the elastic body so as to be relatively rotatable, and the drive plate that transmits torque to the input side member is the radially outer portion of the drive plate. It is connected. Further, the drive plate includes a tongue-like projecting piece that extends between the elastic bodies and is fastened to the input side member, and the projecting piece is input by a plurality of bolts penetrating in the thickness direction. It is fastened to the side member. Therefore, when a torque is transmitted from the drive plate to the input side member and a moment is generated in the protruding piece portion fastened to the input side member, stress is applied to the plurality of bolts provided in the protruding piece portion. The input side member and the projecting piece are in close contact with each bolt seat surface and the surface surrounded by the bolts, and contact friction occurs, so that the stress can be distributed between each bolt seat surface and the surface surrounded by the bolts. As a result, the fastening strength can be improved. Furthermore, by fixing the protruding piece portion of the drive plate with a plurality of bolts, the accuracy of the fixed position of the drive plate can be improved and the drive plate can be prevented from being displaced.

It is a schematic diagram which shows an example of the drive plate which concerns on this invention. It is sectional drawing which shows an example of the torsional vibration reduction apparatus which concerns on this invention. It is a schematic diagram which shows an example of the damper housing which concerns on this invention. It is a fragmentary sectional view which shows an example of the torsional vibration reduction apparatus which concerns on this invention. It is a schematic diagram which shows the other example of the drive plate which concerns on this invention.

  The present invention will be described based on specific examples. First, the configuration will be described. FIG. 2 schematically shows an example in which the present invention is applied between a torque converter 1 which is a fluid coupling and a crankshaft 2 of an engine (not shown) corresponding to an input shaft. This torque converter 1 has a conventionally known structure, and the front cover 5 is integrated with the front side (right side in FIG. 2) of the pump shell 4 having the pump blade 3 attached to the inner peripheral surface. The pump shell 4 and the front cover 5 are joined together to form a liquid-tight case (or housing) 6. A cylindrical fixed shaft 7 is inserted along the central axis of the case 6, and a transmission input shaft 8 is inserted along the central axis of the fixed shaft 7, and the tip portion is the inner surface of the front cover 5. Further, the transmission input shaft 8 is supported rotatably by a fixed shaft 7. The inner peripheral end of the pump shell 4 is fitted to the outer peripheral surface of the fixed shaft 7 so as to rotate while maintaining a liquid-tight state.

  Inside the case 6, a turbine 9 is disposed in a state of facing the pump shell 4 or the pump blade 3 in the axial direction. The turbine 9 has a known structure in which a large number of turbine blades having substantially the same shape as the pump blade 3 are attached to the inner peripheral surface of a turbine shell having a shape substantially symmetrical to the pump shell 4. The turbine 9 is spline-fitted to a transmission input shaft 8 protruding from the fixed shaft 7 and is integrated with the transmission input shaft 8 in the rotational direction.

  Further, there is a stator between a portion on the inner peripheral side of the pump shell 4 and a portion on the inner peripheral side of the turbine 9, that is, between a portion serving as a suction portion in the pump and a portion serving as a discharge portion in the turbine 9. 10 is arranged. The stator 10 is for changing the flow direction of oil discharged from the turbine 9 and is supported by the fixed shaft 7 via a one-way clutch 11. Further, a direct coupling clutch (lock-up clutch) 12 is disposed between the turbine 9 and the inner surface of the front cover 5. The direct coupling clutch 12 is for transmitting torque directly from the front cover 5 to the turbine 9 or the transmission input shaft 8 by frictional contact with the inner surface of the front cover 5, and is formed in a disk shape. The turbine 9 is spline-fitted to the outer peripheral surface of a cylindrical portion formed in a so-called hub portion connecting the transmission input shaft 8. That is, it is configured to rotate integrally with the turbine 9 and to approach and separate from the inner surface of the front cover 5. A friction material 13 is attached to the outer peripheral portion of the surface of the direct coupling clutch 12 facing the front cover 5. The portion of the front cover 5 where the direct coupling clutch 12 is in frictional contact is formed on a flat surface. Further, the direct coupling clutch 12 is configured to be engaged / released by hydraulic pressure, and the configuration of the oil passage and hydraulic pressure control means therefor may be conventionally known.

  The torque converter 1 and the crankshaft 2 are arranged on the same axis, and a drive plate 14 (drive plate) is attached to a tip end portion (end portion on the torque converter 1 side) of the crankshaft 2. A ring gear 15 is attached to the outer periphery. A damper mechanism 16 is provided between the drive plate 14 and the front cover 5 of the torque converter 1 to attenuate torsional vibration. The damper mechanism 16 has a disk-like input side member 17 (damper housing) and an output side member 18 arranged on the same axis so as to be relatively rotatable and opposed to each other, and these members 17 and 18 are rotated. It connects with the direction (circumferential direction) via the coil spring 19 which is an elastic body.

  In the configuration shown in FIG. 2, a coil spring 19 is accommodated in an input side member 17 configured by combining two plate members 17 a and 17 b formed on the outer peripheral side in a semicircular shape. That is, the circular gap 20 is formed by combining the plate members 17 a and 17 b formed in a semicircular shape, and the coil spring 19 is accommodated in the gap 20. Moreover, the output side member 18 is arrange | positioned between each board | plate material 17a, 17b, and the window hole is formed in the part in which the coil spring 19 is arrange | positioned. Therefore, when relative rotation occurs between the input side member 17 and the output side member 18, the gap 20 and the window hole are relatively displaced in the circumferential direction, so that the coil spring 19 is compressed. Yes. And the end part of the output side member 18 is integrally formed with the front cover 5 by the welding 21 in the example shown to a figure. A plurality of gaps 20 and window holes configured as described above are formed at predetermined intervals in the circumferential direction of the input side member 17 and the output side member 18, and the coil springs 19 are respectively stored in the gaps 20. ing. In addition, the elastic body of the damper mechanism 16 according to the present invention is not limited to the coil spring 19, and various conventionally known elastic members can be employed.

  Next, as shown in FIG. 1, the configuration of the drive plate 14 according to the present invention will be described. The drive plate 14 has a through hole 22 having a length substantially equal to the length of the semicircular portion of the input side member 17 (in other words, the length of the coil spring 19) constant in the circumferential direction thereof. A plurality are formed with an interval of. The drive plate 14 is provided with a tongue-like projecting piece 23 extending between the through holes (in other words, coil springs) and fastened to the input side member 17a. 15 is provided. In the example shown in FIG. 1, the projecting piece portion 23 of the drive plate 14 is fastened to the input side member by three bolts 24 penetrating in the thickness direction. As shown in FIG. 3, bolt holes 24 are provided in the input side member that is fastened to the drive plate 14. In addition, the bolt 24 which fastens the protrusion piece part 23 and the input side member 17a of the drive plate 14 may be plural.

  Next, as shown in FIG. 4, a fastening structure between the input side member 17 and the drive plate 14 according to the present invention will be described. The output side member 18 is inserted into the inner wall surface on the outer peripheral side of the input side member 17. A set block 25 is provided between the plate member 17 a of the input side member 17 and the drive plate 14, and the set block 25 is formed integrally with the drive plate 14. The drive plate 14 is fixed to the input side member 17 and the set block 25 by three bolts 24, and the bolts 24 are two on the inner diameter side and one on the outer diameter side in the radial direction of the drive plate 14. And are arranged.

  The drive plate according to the present invention is not limited to the specific example described above. For example, as shown in FIG. 5, the drive plate 14 is provided with a tongue-like protruding piece 23 fastened to the input side member 17a, and the protruding piece 23 and the ring gear 15 are separated from each other. Good. A plurality of bolts 24 may be arranged on the inner diameter side or the outer diameter side in the radial direction of the drive plate 14. Further, the set block 25 is arranged to obtain a fastening force for sufficiently fastening the drive plate 14 to the input side member 17, and the set block 25 has a thickness and a female screw formed on the input side member 17a. This depth may be determined based on the torque acting on the drive plate 14. Further, the set block 25 may not be provided.

  Next, the operation will be described. As the crankshaft 2 of the engine corresponding to the input shaft rotates, torque is transmitted to the drive plate 14 mounted coaxially with the crankshaft 2. The drive plate 14 is provided with a protruding piece 23, and torque is transmitted from the protruding piece 23 to the input side member 17 a connected to the protruding piece 23 by a bolt 24. By transmitting torque from the crankshaft 2 to the input side member 17a via the drive plate 14, the connecting portion between the crankshaft 2 and the drive plate 14, the protruding piece portion 23 of the drive plate 14, and the input side member 17a A moment is generated that causes the connecting part to be a fulcrum. In this case, stress is applied to the plurality of bolts 24 provided on the input side member 17 a and the protruding piece portion 23. The inner diameter side of the projecting piece 23 in the radial direction is more stressed than the outer diameter side. Therefore, two bolts 24 that disperse stress are provided on the inner diameter side in the radial direction of the projecting piece portion 23, and the input side member 17 a and the projecting piece portion 23 are provided between the bolt seat surfaces and the bolts. Since it is in close contact with the enclosed surface D and is in contact friction, the stress can be distributed to each bolt seat surface and the surface D enclosed between the bolts. As a result, the stress applied to the inner diameter side of the protruding piece 23 is reduced. The fastening strength between the input side member 17a and the drive plate 14 can be improved.

  Further, since the stress can be distributed to each bolt seat surface and the surface D surrounded by the bolts, the axial force of each bolt 24 can be set small. As a result, the input side member 17a and the drive plate 14 can be set. The engagement length of the bolts 24 required for fastening can be shortened while maintaining the fastening strength, and the thickness of the set block 25 can be further reduced. Further, since the axial force of each bolt 24 can be set small, the size of the bolt 24 and the bolt head can be reduced.

  Furthermore, by fixing the protruding piece portion 23 of the drive plate 14 with a plurality of bolts 24, the accuracy of the fixing position of the drive plate 14 can be improved, and the shaft displacement of the drive plate 14 can be prevented.

  In addition, this invention is not limited to the specific example mentioned above, The input side member and the output side member are connected so that relative rotation is possible via the elastic body arranged in multiple numbers in the rotation direction, and torque is applied to the input side member. The torsional vibration reducing device may be used as long as the drive plate for transmitting the vibration is connected by a fastening member at the outer peripheral side in the radial direction. The torsional vibration reducing device according to the present invention can be used for machines and devices that transmit power by rotating, such as vehicles, aircraft, ships, and industrial machines.

  DESCRIPTION OF SYMBOLS 14 ... Drive plate, 17 ... Input side member, 18 ... Output side member, 19 ... Coil spring, 23 ... Projection piece part (of drive plate), 24 ... Bolt.

Claims (2)

An input side member and an output side member are connected to each other through a plurality of elastic bodies arranged in the rotational direction so as to be relatively rotatable, and a drive plate that transmits torque to the input side member is a portion on the outer peripheral side in the radial direction. In the torsional vibration reduction device connected by
The drive plate includes a tongue-like protruding piece portion that extends between the elastic bodies and is fastened to the input side member,
The torsional vibration reducing device, wherein the protruding piece is fastened to the input side member by a plurality of bolts penetrating in the thickness direction.   The plurality of bolts include at least two bolts arranged in a circumferential direction of the drive plate, and other bolts arranged at positions shifted in the radial direction of the drive plate with respect to the two bolts. The torsional vibration reducing device according to claim 1, comprising:

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