JP7013315B2 - Tortional damper with bending damper - Google Patents

Description

The present invention relates to a torsional damper with a bending damper according to a vibration isolation technique for a rotary drive system.

Conventionally, the torsional damper 1 shown in FIG. 11 is known, and this torsional damper 1 has a boss portion 12, a stay portion 13, and a rim portion 14, and is shafted by a pulley bolt 41 inserted into the boss portion 12 (shown). The hub 11 to be attached to the end of the rim, the torsional damper 21 to which the damper mass 23 is connected to the outer peripheral side of the rim 14 via the damper rubber 22, and the mounting member 32 and the bent damper rubber on the inner peripheral side of the rim 14. It is a torsional damper with a bending damper including a bending damper portion 31 in which a bending damper mass 34 is connected via 33.

The torsional damper 1 having the above configuration absorbs the torsional vibration (vibration in the circumferential direction) generated in the rotational drive system by the resonance operation of the torsional damper portion 21, and also absorbs the bending vibration (diameter) generated in the rotational drive system. Since vibration in the direction) is absorbed by the resonance operation of the bending damper portion 31, one damper device can absorb and reduce two types of vibration.

Jitsukaihei 1-144444A Gazette

However, the torsional damper 1 has room for improvement in the following points.

That is, in the torsional damper 1 having the above configuration, the mounting member 32 of the bending damper portion 31 is fixed to the inner peripheral side of the rim portion 14 by the fitting structure, and the fitting structure sets the fitting allowance. Therefore, once fixed, the mounting member 32 cannot be removed from the rim portion 14, or it takes time and effort to remove the mounting member 32.

On the other hand, as described above, the torsional damper 1 is attached to the end of the shaft by the pulley bolt 41 inserted into the boss portion 12 of the hub 11, so that when the torsional damper 1 is attached to the end of the shaft, the attachment work is performed. The pulley bolt 41 and the washer 42 combined with the pulley bolt 41 are inserted into the inner peripheral side of the bent damper portion 31.

Therefore, in order to enable this insertion, the bending damper portion 31 must have an inner diameter dimension d ₁ larger than the head 41 a of the pulley bolt 41 and the outer diameter dimension d ₂ of the washer 42, and conversely, the bending damper portion 31. If the inner diameter dimension d ₁ of 31 is formed smaller than the head 41 a of the pulley bolt 41 and the outer diameter dimension d ₂ of the washer 42, the pulley bolt 41 and the washer 42 cannot be bent and inserted into the inner peripheral side of the damper portion 31.

Therefore, the torsional damper ₁ has a condition that the inner diameter dimension d1 of the bending damper portion 31 must be formed to be larger _than the head 41a of the pulley bolt 41 and the outer diameter dimension d2 of the washer 42. As a result, the bending damper portion 31 cannot be expanded inward in the radial direction, and there is a disadvantage that the degree of freedom in designing the bending damper portion 31 is small.

An object of the present invention is to expand the bending damper portion inward in the radial direction, thereby expanding the degree of freedom in designing the bending damper portion.

In order to solve the above problems, the torsional damper of the present invention has a boss portion, a stay portion, and a rim portion, and has a hub attached to the end of the shaft by a pulley bolt inserted into the boss portion, and an outer peripheral side of the rim portion. A torsional damper with a bending damper, which comprises a torsional damper portion in which a damper mass is connected via a damper rubber, and a bending damper portion in which a mounting member and a bending damper mass are connected via a bending damper rubber on the inner peripheral side of the rim portion. Therefore, the ridge portion on the circumference provided on the inner peripheral surface of the rim portion, the female screw portion provided on the ridge portion, and the ridge portion and the circumference so as not to interfere with the ridge portion. A part of the notch on the circumference provided in the bent damper mass and the bent damper rubber, and a screw insertion hole provided in the mounting member by aligning the position of the notch and the notch on the circumference. It is characterized by comprising a mounting screw that is inserted through the screw insertion hole and is detachably screwed into the female screw portion.

Further, as an embodiment, in the torsional damper with a bending damper described above, the displacement amount is regulated by abutting on the inner peripheral surface of the raised portion when the bending damper mass is displaced in the radial direction with respect to the hub. The radial stopper member is attached to the bent damper mass.

Further, as an embodiment, in the torsional damper with a bending damper described above, the bending damper mass is provided with a notch portion on the circumference so that an annular portion on the inner peripheral side and a non-annular portion on the outer peripheral side are provided. The annular portion is provided with a portion, and the annular portion is arranged on the inner peripheral side of the raised portion, and the non-annular portion is arranged alternately with the raised portion on the circumference, and a mounting groove is provided at the stay side end portion of the annular portion. Is provided, the radial stopper member is mounted in the mounting groove, and the axial length of the non-annular portion is set to be larger than the axial length of the annular portion, so that the stay side end of the non-annular portion is set. The portion is characterized in that the portion protrudes toward the stay portion side from the stay side end portion of the radial stopper member mounted in the mounting groove.

In the present invention, since the bending damper portion is detachably attached to the hub by the mounting screw, the mounting work of mounting the torsional damper on the shaft or removing the torsional damper from the shaft with the bending damper portion removed from the hub. It is possible to perform the removal work. Therefore, it is not necessary to form the inner diameter of the bending damper portion larger than the outer diameter dimension of the head of the pulley bolt and the washer, and on the contrary, it is possible to form it smaller. Therefore, the bending damper portion can be expanded inward in the radial direction, and thus the degree of freedom in designing the bending damper portion can be expanded. Further, the rim portion of the hub is usually not thick enough to screw the mounting screw, but by providing a part of the raised portion on the circumference on the inner peripheral surface of this rim portion. The radial thickness of the rim is substantially expanded, a female screw part is provided on this raised part, a screw insertion hole is provided on the mounting member, and the mounting screw is inserted into the screw insertion hole and screwed into the female screw part. It is possible to attach the bent damper part to the hub from the end face side of the.

Front view of the torsional damper with bending damper according to the first embodiment as viewed from one side in the axial direction. It is a cross-sectional view of the torsional damper, and is a cross-sectional view taken along the line AA in FIG. Cross-sectional perspective view of the torsional damper Cross-sectional perspective view showing the state before attaching the bending damper part to the torsional damper. Cross-sectional perspective view showing the state before attaching the bending damper part to the torsional damper. Front view of the torsional damper with bending damper according to the second embodiment as viewed from one side in the axial direction. It is a cross-sectional view of the torsional damper, and is a cross-sectional view taken along the line BB in FIG. Cross-sectional perspective view of the torsional damper Cross-sectional perspective view showing the state before attaching the bending damper part to the torsional damper. Cross-sectional perspective view showing the state before attaching the bending damper part to the torsional damper. Cross-sectional view of torsional damper with bending damper related to background technology

First Embodiment (FIGS. 1 to 5) ...
1 to 5 show a torsional damper 1 with a bending damper according to the first embodiment.

As shown in FIGS. 2 and 3, the torsional damper 1 according to the embodiment includes an annular hub 11 having a boss portion 12, a stay portion 13 and a rim portion 14 integrally, and has a tubular shape in the hub 11. A torsional damper portion 21 in which a damper mass 23 is connected via a damper rubber 22 is provided on the outer peripheral side of the rim portion 14, and a mounting member 32 made of an annular plate and a bent damper rubber 33 are provided on the inner peripheral side of the rim portion 14. A bending damper portion 31 is provided in which the bending damper mass 34 is connected via the bending damper mass 34.

The torsional damper portion 21 is a rubber fitting type torsional damper portion in which a damper rubber 22 is press-fitted and fitted between the rim portion 14 and the damper mass 23 from one axial direction. In addition, a sleeve (not shown) is used. ) And the damper rubber 22 are vulcanized and bonded between the damper mass 23, and a bush-type torsional damper portion in which the sleeve is fitted to the rim portion 14 may be used. A pulley groove 24 for winding an endless belt (not shown) related to torque transmission may be provided on the outer peripheral surface of the damper mass 23.

On the other hand, as the bending damper portion 31, the mounting member 32, the bending damper rubber 33 and the bending damper mass 34 are arranged in the axial direction, and the bending damper rubber 33 is vulcanized and bonded between the mounting member 32 and the bending damper mass 34. A stepped engaging portion 15 for positioning and fitting the mounting member 32 is provided on the inner peripheral surface of the tip portion of the rim portion 14.

The hub 11 is attached to the end of a shaft (not shown) such as a vehicle crankshaft by a pulley bolt 41 inserted through the inner circumference of the boss portion 12. The pulley bolt 41 has a head portion 41a that sandwiches the boss portion 12 with the end portion of the shaft. A washer (not shown) may be interposed between the head 41a and the boss portion 12.

On the inner peripheral surface of the tubular rim portion 14 of the hub 11, a plurality of raised portions 16 on the circumference having a shape extending in the axial direction (for example, three equally arranged portions as shown in the figure) are integrally integrated. A female screw portion 17 is provided on each end surface of the raised portion 16 on the tip end side of the rim portion.

Further, the bending damper mass 34 and the bending damper rubber 33 have a plurality of notches 34a and 33a on the circumference, respectively, by aligning the positions on the circumference with the raised portion 16 so as not to interfere with the raised portion 16. For example, there are a plurality of screw insertion holes 35 (for example, as shown in the figure) provided in the mounting member 32 by aligning the notches 34a and 33a with the positions on the circumference. A plurality of mounting screws (for example, three) are inserted into the screw insertion holes 35 (for example, three) and are screwed into the female screw portion 17 so as to be removable.

Even if the notch portion 34a is provided, the bending damper mass 34 remains annular, but the bending damper rubber 33 may be divided and divided in the circumferential direction by the notch portion 33a.

Further, by providing the notch portion 34a, the bent damper mass 34 is provided with an annular portion 34b on the inner peripheral side and a non-annular portion (non-annular equidistant portion) 34c on the outer peripheral side. The annular portion 34b is arranged on the inner peripheral side of the raised portion 16. The non-annular portion 34c is arranged alternately with the raised portion 16 on the circumference. Further, the non-annular portion 34c is formed longer in the axial direction than the annular portion 34b.

The inner diameter dimension (minimum inner diameter dimension) of the bending damper portion 31 is the inner diameter dimension of the bending damper mass 34 having the smallest diameter among its constituent parts, and is determined by the inner diameter dimension of the annular portion 34b. The inner diameter of the pulley bolt 41 is smaller than the outer diameter of the head (including the brim) 41a of the pulley bolt 41 and the outer diameter of the seat.

The torsional damper 1 having the above configuration absorbs the torsional vibration generated in the rotational drive system by the resonance operation of the torsional damper unit 21, and also absorbs the bending vibration generated in the rotational drive system by the resonance operation of the bending damper unit 31. Since it absorbs, two types of vibration can be absorbed and reduced by one damper device.

Further, in the torsional damper 1 having the above configuration, since the bending damper portion 31 is detachably attached to the hub 11 by the mounting screw 36, the toe is provided with the bending damper portion 31 removed from the hub 11 as shown in FIG. It is possible to perform mounting work for mounting the sional damper 1 on the shaft and removal work for removing the torsional damper 1 from the shaft. Therefore, even if the inner diameter of the bending damper portion 31 is made smaller than the outer diameter of the head 41a of the pulley bolt 41 and the washer 42, these operations can be performed. Therefore, the inner diameter of the bending damper portion 31 is set to the pulley bolt 41. It is possible to form the head 41a and the washer 42 smaller than the outer diameter. Therefore, as a result, the bending damper portion 31 can be expanded inward in the radial direction as compared with the conventional case, and the degree of freedom in designing the bending damper portion 31 can be expanded.

Second Embodiment (FIGS. 6 to 10) ...
In the first embodiment, the annular portion 34b of the bending damper mass 34 in the bending damper portion 31 is arranged in a non-contact manner on the inner peripheral side of the raised portion 16 of the hub 11, so that the bending damper mass 34 resonates and operates. When displaced in the radial direction, the amount of displacement in the radial direction is restricted by contacting the inner peripheral surface 16a of the raised portion 16, but this causes the amount of displacement in the radial direction to become too large, and the bending damper rubber 33 becomes used. There is concern that an excessive burden will be applied. Further, since the bending damper mass 34 and the hub 11 are both metal parts, there is a concern that a large abnormal noise (metal collision noise) may be generated at the time of contact.

Therefore, in order to deal with these problems, as a second embodiment, as shown in FIGS. 6 to 10, when the bending damper mass 34 is radially displaced during operation, it hits the inner peripheral surface 16a of the raised portion 16. It is preferable to attach a radial stopper member 37 that regulates the amount of radial displacement to a certain amount by contacting the bending damper mass 34, and according to this configuration, the radial stopper member 37 replaces the bending damper mass 34. By abutting on the inner peripheral surface 16a of the raised portion 16, the amount of radial displacement is restricted to a certain amount.

The radial stopper member 37 is formed in an annular shape by a material such as a resin having excellent sliding characteristics or wear resistance. The radial stopper member 37 has an outer diameter larger than the outer diameter of the annular portion 34b. The radial stopper member 37 is mounted in the annular mounting groove 34d provided at the stay-side end of the annular portion 34b. The mounting groove 34d is provided on the outer peripheral surface of the stay side end portion of the annular portion 34b, and correspondingly, a notch portion 34e extending in the circumferential direction is provided on the inner peripheral portion of the non-annular portion 34c. Therefore, the radial stopper member 37 is mounted in the annular mounting groove 34d provided on the outer peripheral surface of the stay side end portion of the annular portion 34b, and is housed in the notch portion 34e on the inner peripheral side of the non-annular portion 34c. There is. Even if the radial stopper member 37 is mounted at this position, the non-annular portion 34c exists on the outer peripheral side thereof, so that the stopper member 37 is located between the non-annular portions 34c adjacent to each other (notch portion 34a). The outer peripheral surface of the radial stopper member 37 is exposed. A raised portion 16 is arranged between the non-annular portions 34c adjacent to each other. Therefore, the radial stopper member 37 can come into contact with the inner peripheral surface 16a of the raised portion 16 at a part of the outer peripheral surface thereof.

According to the configuration in which the radial stopper member 37 is provided as described above, the amount of radial displacement of the bending damper mass 34 is restricted to a certain amount, so that an excessive load is applied to the bending damper rubber 33 or a large difference occurs at the time of contact. It is possible to suppress the generation of sound (metal displacement sound).

Further, with respect to the annular portion 34b and the non-annular portion 34c provided in the bending damper mass 34, the axial length L ₂ of the latter non-annular portion 34c is set larger than the axial length L ₁ of the former annular portion 34b. Further, the stay side end portion 34f of the non-annular portion 34c is projected toward the stay portion 13 side of the hub 11 (overhangs) rather than the stay side end portion 37a of the radial stopper member 37 mounted in the mounting groove 34d. ) Is preferable. According to the configuration in which the outer peripheral side of the bending damper mass 34 is overhanging in the axial direction from the radial stopper member 37, the size of the bending damper mass 34 is not only directed inward in the radial direction but also on the stay portion 13 side (axial direction). ) Can also be expanded.

Other configurations and effects according to the second embodiment (FIGS. 6 to 10) are the same as those of the first embodiment (FIGS. 1 to 5). Therefore, the same reference numerals are given to the drawings and the description thereof will be omitted.

1 Tortional damper (tortional damper with bending damper)
11 Hub 12 Boss part 13 Stay part 14 Rim part 15 Engagement part 16 Raised part 16a Inner peripheral surface 17 Female thread part 21 Tortional damper part 22 Damper rubber 23 Damper mass 24 Pulley groove 31 Bending damper part Stay side end 32 Mounting member 33 Bending damper rubber 33a, 34a, 34e Notch 34 Bending damper mass 34b Circular part 34c Non-annular part 34d Mounting groove 34f, 37a Stay side end 35 Screw insertion hole 36 Mounting screw 37 Radial stopper member 41 Pulley bolt 41a Head

Claims (3)

A hub that has a boss portion, a stay portion, and a rim portion and is attached to the end of the shaft by a pulley bolt that is inserted into the boss portion, and a torsional damper portion that connects a damper mass to the outer peripheral side of the rim portion via a damper rubber. A torsional damper with a bending damper, comprising a bending damper portion in which a bending damper mass is connected via a mounting member and a bending damper rubber on the inner peripheral side of the rim portion.
A part of the raised portion on the circumference provided on the inner peripheral surface of the rim portion, the female screw portion provided on the raised portion, and the position on the raised portion and the circumference so as not to interfere with the raised portion. A part of the notch on the circumference provided in the bent damper mass and the bent damper rubber, a screw insertion hole provided in the mounting member with the notch and the position on the circumference aligned with each other, and the above. A torsional damper with a bending damper, which comprises a mounting screw that is inserted through a screw insertion hole and is detachably screwed into the female screw portion. In the torsional damper with a bending damper according to claim 1,
A bending damper characterized in that a radial stopper member that regulates the amount of displacement by abutting on the inner peripheral surface of the raised portion when the bending damper mass is displaced in the radial direction with respect to the hub is attached to the bending damper mass. With torsional damper. In the torsional damper with a bending damper according to claim 2,
The bent damper mass is provided with an annular portion on the inner peripheral side and a non-annular portion on the outer peripheral side by providing a notch portion on the circumference thereof.
The annular portion is arranged on the inner peripheral side of the raised portion.
The non-annular portion is alternately arranged on the circumference with the raised portion.
A mounting groove is provided at the stay-side end of the annular portion.
The radial stopper member is mounted in the mounting groove, and the radial stopper member is mounted.
By setting the axial length of the non-annular portion to be larger than the axial length of the annular portion, the stay-side end of the non-annular portion is on the stay side of the radial stopper member mounted in the mounting groove. A torsional damper with a bending damper, characterized in that it protrudes toward the stay portion from the end portion.

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