Power transmission

Abstract

To provide a power transmission device capable of reducing costs.SOLUTION: A power transmission device 100 comprises an inertia ring 2, a plate 3, a plurality of first bolts 11, a torque transmission member 50, and a plurality of second bolts 12. The inertia ring 2 is annular. The inertia ring 2 has a plurality of through holes 21. The respective through holes 21 are arranged at intervals in a circumferential direction. The plate 3 is arranged on a first side with respect to the inertia ring 2 in an axial direction. Each first bolt 11 is screwed into each through hole 21 from the first side to fasten the plate 3 to the inertia ring 2. The torque transmission member 50 is arranged on a second side with respect to the inertia ring 2 in the axial direction. Each second bolt 12 is screwed into each through hole 21 from the second side to fasten the torque transmission member 50 to the inertia ring 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power transmission device. [Background technology]

[0002] A power transmission device in which a torque transmission device such as a damper device is attached to a flexible flywheel is known (Patent Document 1). The flexible flywheel is constructed by attaching an inertia ring to the outer periphery of an elastic plate. The damper device is attached to the inertia ring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-19918 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for reducing the cost of the power transmission device configured as described above. Therefore, an object of the present invention is to provide a power transmission device that can be manufactured at a low cost. [Means for solving the problem]

[0005] A power transmission device according to one aspect of the present invention includes an inertia ring, a plate, a plurality of first bolts, a torque transmission member, and a plurality of second bolts. The inertia ring is annular. The inertia ring has a plurality of through holes. The through holes are spaced apart in the circumferential direction. The plate is arranged on a first side relative to the inertia ring in the axial direction. Each of the first bolts screws into each of the through holes from the first side to fasten the plate to the inertia ring. The torque transmission member is arranged on a second side relative to the inertia ring in the axial direction. The torque transmission member receives the torque from the inertia ring.Each second bolt is screwed into each through hole from the second side to fasten the torque transmission member to the inertia ring.

[0006] According to this configuration, the first bolt for fastening the plate to the inertia ring and the second bolt for fastening the torque transmission member to the inertia ring are screwed into the same through hole. In this way, the through hole for the first bolt and the through hole for the second bolt are shared, so that manufacturing costs can be reduced, and the cost of the power transmission device can be reduced.

[0007] Preferably, the power transmission device further includes a knock pin. The knock pin is a member for positioning the torque transmission member relative to the inertia ring. The through hole includes a first through hole and a second through hole. The first through hole has a female thread portion over the entire axial direction. The second through hole has a first hole portion and a second hole portion. The first hole portion is disposed on a first side in the axial direction and has a female thread portion. The second hole portion is disposed on a second side in the axial direction and does not have a female thread portion. The first bolt screws into the first through hole or the first hole portion of the second through hole. The second bolt screws into the first through hole. The knock pin is inserted into the second hole portion of the second through hole.

[0008] Preferably, the power transmission device further includes a knock pin. The knock pin is a member for positioning the torque transmission member with respect to the inertia ring. The inertia ring has a plurality of recesses into which the knock pins are inserted.

[0009] Preferably, the plate has a plurality of third through holes arranged on the same circumference. The torque transmission member has a plurality of fifth through holes arranged on the same circumference. The first bolt is screwed into the through holes through the third through holes. The second bolt is screwed into the through holes through the fifth through holes. The PCD of each of the third through holes is the same as the PCD of each of the fifth through holes.

[0010] Preferably, the torque transmitting member is a damper device that damps rotational fluctuations from the inertia ring. Effect of the Invention

[0011] According to the present invention, it is possible to reduce the cost of the power transmission device. [Brief description of the drawings]

[0012] [Figure 1] FIG. 4 is a cross-sectional view of the power transmission device showing a first through hole. [Diagram 2] FIG. 4 is a cross-sectional view of the power transmission device showing a second through hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the power transmission device according to this embodiment will be described with reference to the drawings. In the following description, the axial direction is the direction in which the rotation axis O of the power transmission device extends. The circumferential direction is the circumferential direction of a circle centered on the rotation axis O, and the radial direction is the radial direction of a circle centered on the rotation axis O. In this embodiment, the first axial side means the left side in Figs. 1 and 2, and the second axial side means the right side in Figs. 1 and 2.

[0014] 1 and 2, the power transmission device 100 includes a flexible flywheel 10, a damper device 50 (an example of a torque transmission member), a plurality of first bolts 11, a plurality of second bolts 12, and a plurality of knock pins 13. The power transmission device 100 is disposed, for example, in a power transmission path from a drive source such as an engine or an electric motor to a drive wheel. For example, a drive source is disposed on a first axial side of the power transmission device 100, and a transmission or the like is disposed on a second axial side of the power transmission device 100.

[0015] The power transmission device 100 is attached to a first and a second transmission shaft so as to transmit power from a first transmission shaft (not shown) on the drive source side to a second transmission shaft (not shown) on the drive wheel side. The first transmission shaft and the second transmission shaft are arranged coaxially. The first transmission shaft is, for example, a crankshaft. The second transmission shaft is, for example, an input shaft of a transmission. A flexible flywheel 10 is attached to the first transmission shaft, and a damper device 50 is attached to the second transmission shaft.

[0016] [Flexible flywheel] The flexible flywheel 10 has an inertia ring 2 and a flexible plate 3 (an example of a plate). The flexible flywheel 10 also has a disc spring 4.

[0017] The inertia ring 2 is annular. The inertia ring 2 has a plurality of first through holes 21 and a plurality of second through holes 22. Each of the first through holes 21 and each of the second through holes 22 penetrates the inertia ring 2 in the axial direction.

[0018] Each of the first through holes 21 and each of the second through holes 22 are arranged on the same circumference. That is, the pitch circle diameter (PCD) of each of the first through holes 21 is the same as the PCD of each of the second through holes 22. Each of the first through holes 21 and each of the second through holes 22 are arranged at intervals from each other in the circumferential direction.

[0019] As shown in Fig. 1, the first through hole 21 extends in the axial direction. The first through hole 21 opens to a first side in the axial direction and also opens to a second side in the axial direction. The first through hole 21 has a female screw portion over the entire axial direction. That is, the first through hole 21 forms a screw hole over the entire axial direction.

[0020] 2, the second through hole 22 extends in the axial direction. The second through hole 22 opens to a first side in the axial direction and also opens to a second side in the axial direction. The second through hole 22 has a first hole portion 221 and a second hole portion 222.

[0021] The first hole portion 221 is a portion of the second through hole 22 that is disposed on a first axial side. The first hole portion 221 has a female thread portion. That is, the first hole portion 221 constitutes a screw hole.

[0022] The second hole portion 222 is a portion of the second through hole 22 that is arranged on the second axial side. The second hole portion 222 has a larger diameter than the first hole portion 221. Therefore, a step portion 223 is formed between the second hole portion 222 and the first hole portion 221. The second hole portion 222 is arranged coaxially with the first hole portion 221.

[0023] The second hole portion 222 does not have a female screw portion, that is, the second hole portion 222 does not constitute a screw hole.

[0024] 1 and 2, the flexible plate 3 is disposed on a first side relative to the inertia ring 2 in the axial direction. The flexible plate 3 is disk-shaped and has an opening in the center. The flexible plate 3 has an outer diameter smaller than that of the inertia ring 2.

[0025] A first transmission shaft is attached to the inner periphery of the flexible plate 3. Power is transmitted from a drive source such as an engine or an electric motor to the flexible plate 3 via the first transmission shaft. The flexible plate 3 is capable of elastic deformation. Therefore, the flexible plate 3 can absorb vibrations from the first transmission shaft.

[0026] The flexible plate 3 is attached at its outer periphery to the inertia ring 2. The flexible plate 3 is attached to the inertia ring 2 by a plurality of first bolts 11.

[0027] In detail, the flexible plate 3 has a plurality of third through holes 31. The third through holes 31 are arranged on the same circumference at intervals from each other. The PCD of each of the third through holes 31 is the same as the PCD of each of the first through holes 21.

[0028] The first bolt 11 passes through the third through hole 31 from the first side in the axial direction and is screwed into the first through hole 21 or the second through hole 22. In this way, the first bolt 11 fastens the flexible plate 3 to the inertia ring 2.

[0029] The disc spring 4 is disposed between the inertia ring 2 and the flexible plate 3 in the axial direction. The outer peripheral end of the disc spring 4 abuts against the inner peripheral end of the inertia ring 2. The inner peripheral end of the disc spring 4 abuts against the flexible plate 3.

[0030] [Damper device] The damper device 50 is disposed on a second side relative to the inertia ring 2 in the axial direction. The damper device 50 is attached to the inertia ring 2 at its outer periphery. The damper device 50 is attached to the inertia ring 2 by a plurality of second bolts 12. The damper device 50 is configured so that torque is transmitted from the inertia ring 2.

[0031] In detail, the damper device 50 has a plurality of fourth through holes 54 and fifth through holes 55. The fourth through holes 54 are arranged on the same circumference at intervals. The PCD of each of the fourth through holes 54 is Each second through hole 22 That is, the PCD of each fourth through hole 54 is the same as the PCD of each third through hole 31.

[0032] 2, the knock pin 13 fits into the fourth through hole 54 and also into the second hole portion 222 of the second through hole 22. In this manner, the knock pin 13 fits into the fourth through hole 54 and the second through hole 22, thereby positioning the damper device 50 in the circumferential direction. Note that the step portion 223 restricts the knock pin 13 from entering the first hole portion 221.

[0033] 1, the fifth through holes 55 are arranged on the same circumference with a gap between them. The fifth through holes 55 are arranged on the same circumference as the fourth through holes 54. The PCD of each of the fifth through holes 55 is the same as the PCD of each of the first through holes 21. That is, the PCD of each of the fifth through holes 55 is the same as the PCD of each of the third through holes 31.

[0034] The second bolt 12 passes through the fifth through hole 55 from the second axial side and is screwed into the first through hole 21. In this way, the second bolt 12 fastens the damper device 50 to the inertia ring 2. Note that the tip of the first bolt 11 and the tip of the second bolt 12 are not in contact with each other. In other words, there is a gap between the first bolt 11 and the second bolt 12 in the axial direction.

[0035] In this way, when the damper device 50 is attached to the inertia ring 2, all of the multiple second bolts 12 are screwed into the first through holes 21, and are not screwed into the second through holes 22. Instead of the second bolts 12 being screwed into the second through holes 22, knock pins 13 are fitted into the second through holes 22. On the other hand, when the flexible plate 3 is attached to the inertia ring 2, some of the multiple first bolts 11 are screwed into the first through holes 21, and the remaining first bolts 11 are screwed into the second through holes 22. The total number of the second bolts 12 and the knock pins 13 is equal to the number of the first bolts 11. That is, the number of the first bolts 11 is greater than the number of the second bolts 12.

[0036] The damper device 50 includes a damper unit 5 and a torque limiter unit 6 .

[0037] The damper unit 5 has a first input plate 51, a second input plate 52, a hub flange 53, and a plurality of elastic members 56. The damper unit 5 also has a hysteresis generating mechanism 57. The damper unit 5 is configured to damp rotation fluctuations.

[0038] The first input plate 51 and the second input plate 52 are fixed to each other by rivets 58 and rotate together. The first input plate 51 and the second input plate 52 have window portions 511, 521. The window portions 511, 521 support an elastic member 56.

[0039] The hub flange 53 is configured to transmit torque from the first and second input plates 51, 52 to an output device. The hub flange 53 has a hub 531 and a flange plate 532. The hub 531 and the flange plate 532 are integrated by a plurality of teeth and a plurality of recesses with which the teeth mesh.

[0040] The hub 531 is a cylindrical member having a splined hole formed therein. The second transmission shaft can be spline-engaged with this splined hole.

[0041] The flange plate 532 is disposed between the first input plate 51 and the second input plate 52 in the axial direction. The flange plate 532 has an accommodating hole 533. The elastic member 56 is accommodated in the accommodating hole 533.

[0042] The elastic member 56 is configured to elastically connect in the rotational direction between the first and second input plates 51, 52 and the flange plate 532. The elastic member 56 is, for example, a coil spring.

[0043] [Torque limiter unit] The torque limiter unit 6 is disposed radially outward relative to the damper unit 5. The torque limiter unit 6 is configured to limit the torque transmitted between the flexible flywheel 10 and the damper unit 5.

[0044] The torque limiter unit 6 includes a first side plate 61 , a second side plate 62 , a pressure plate 63 , a cone spring 64 , and a friction disc 65 .

[0045] The first and second side plates 61, 62 are annular. The first side plate 61 and the second side plate 62 are fixed to each other by rivets 66 or the like. Therefore, the first side plate 61 and the second side plate 62 rotate integrally with each other. A plurality of fourth through holes 54 and a plurality of fifth through holes 55 are formed on the outer periphery of the first and second side plates 61, 62.

[0046] The pressure plate 63 is annular. The pressure plate 63 is disposed between the first side plate 61 and the second side plate 62 in the axial direction. The cone spring 64 is disposed between the second side plate 62 and the pressure plate 63 in the axial direction. The cone spring 64 biases the pressure plate 63 towards the first side plate 61.

[0047] The friction disc 65 has a core plate 651 and a pair of friction members 652. The friction disc 65 is attached at its inner peripheral end to the first input plate 51. The cone spring 64 presses the friction disc 65 against the first side plate 61 via the pressure plate 63.

[0048] When a torque equal to or greater than a predetermined value is input from the inertia ring 2 to the first side plate 61, the friction disc 65 slides against the first side plate 61, and the friction disc 65 and the first side plate 61 rotate relative to each other.

[0049] [Variations] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention.

[0050] Variation 1 In the above embodiment, the inertia ring 2 has two types of through holes, the first through hole 21 and the second through hole 22, but the configuration of the inertia ring 2 is not limited to this. For example, the inertia ring 2 may have only the first through hole 21 and not the second through hole 22.

[0051] In this case, the number of first bolts 11 can be the same as the number of second bolts 12. Also, a plurality of recesses for knock pins 13 may be formed in the inertia ring 2. The PCD of each recess for knock pins 13 may be the same as or different from the PCD of each first through hole 21.

[0052] Variation 2 In the above embodiment, the damper device 50 has the torque limiter unit 6, but it is not necessary to have the torque limiter unit 6. In this case, fourth and fifth through holes 54, 55 are formed in the outer periphery of at least one of the first input plate 51 and the second input plate 52 of the damper unit 5. Then, at least one of the first input plate 51 and the second input plate 52 is fastened to the inertia ring 2 by the second bolt 12. [Explanation of symbols]

[0053] 2: Inertia ring 21: First through hole 22: Second through hole 221: 1st hole 222: 2nd hole 3: Flexible plate 31: Third through hole 11: First bolt 12: Second bolt 13: Knock pin 50: Damper device 55: 5th through hole 100: Power transmission device

Claims

1. an annular inertia ring having a plurality of through holes spaced apart in a circumferential direction; a plate disposed on a first side relative to the inertia ring in the axial direction; a plurality of first bolts that are screwed into the through holes from the first side and fasten the plate to the inertia ring; a torque transmission member disposed on a second side of the inertia ring in the axial direction, to which torque is transmitted from the inertia ring; a plurality of second bolts that are screwed into the through holes from the second side and fasten the torque transmission member to the inertia ring; a knock pin for positioning the torque transmission member relative to the inertia ring; Equipped with The through hole includes a first through hole and a second through hole, The first through hole has a female screw portion over the entire axial direction, The second through hole has a first hole portion disposed on a first side in the axial direction and having a female thread portion, and a second hole portion disposed on a second side in the axial direction and not having a female thread portion, the plurality of first bolts include a first bolt screwed into the first through hole and a first bolt screwed into a first hole portion of the second through hole, Each of the second bolts is screwed into the first through hole, The knock pin is inserted into the second hole portion of the second through hole. Power transmission device.

2. the plate has a plurality of third through holes arranged on the same circumference; the torque transmission member has a plurality of fifth through holes arranged on the same circumference, The first bolt is screwed into the through hole via the third through hole, The second bolt is screwed into the through hole via the fifth through hole, The P.C.D of each of the third through holes is the same as the P.C.D of each of the fifth through holes; The power transmission device according to claim 1 .

3. The torque transmission member is a damper device that damps rotational fluctuations from the inertia ring.

3. A power transmission device according to claim 1 or 2.

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