JP2011256941A - Gear damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear damper having a function of limiting relative displacement between a gear and a hub when an excessive torque is input to a constant amount so that the damage of a rubber elastomer is prevented.SOLUTION: A circumferential direction stopper structure is provided, which limits circumferential direction relative displacement between a gear and a hub to a prescribed angle when the gear and the hub are relatively displaced in a circumferential direction by engaging an inner surface of a recess provided to a sleeve relative to an element piece inserted through a rubber elastomer. An axial direction stopper structure is provided, which limits axial direction relative displacement between the gear and the hub to a prescribed distance when the gear and the hub are relatively displaced in an axial direction by engaging the sleeve or the hub with one flange provided at an end of the element piece in the axial direction and by engaging the sleeve or the gear with the other flange in the axial direction.

Description

  The present invention relates to a gear having a damper function, that is, a gear damper.

  Conventionally, scissor gears are used to transmit engine torque. However, since rotational resistance is high, mechanical loss increases, leading to deterioration in fuel consumption. For this reason, it is necessary to abolish the scissors gear, but because of the concern about the occurrence of rattling noise, countermeasures by gear dampers are cited.

  As shown in FIG. 21, the gear damper includes a rubber-like elastic body c that exerts an elastic action between a hub a and a gear b arranged on the outer diameter side thereof, and has a rubber-like elastic body c. From the viewpoint of improving assemblability, a bush is formed by interposing a rubber-like elastic body c between an inner sleeve and an outer sleeve (not shown), and a hub a is fitted to the inner diameter side of the bush and the bush In some cases, the gear b is fitted to the outer diameter side. A drive shaft is inserted and fixed on the inner diameter side of the hub a (see Patent Document 1).

  In the conventional gear damper, when excessive torque is input to the gear damper via the drive shaft, the torsion angle between the hub a and the gear b increases, and the rubber-like elastic body c is damaged, so that the drive shaft with respect to the gear b is damaged. There is a concern that the engine will run idle and torque transmission will not be possible. Further, when excessive torque is input in the axial direction, the distortion of the rubber-like elastic body c in the axial direction increases, and therefore, the rubber-like elastic body c is damaged, causing the drive shaft to idle with respect to the gear b and transmitting torque. There is also concern that it will not be possible.

Japanese Utility Model Publication No. 64-36755 (Fig. 4)

  In view of the above points, the present invention has a function of limiting the relative displacement between the hub and the gear when an excessive torque is input to a certain amount, thereby suppressing the rubber-like elastic body from being damaged. The object is to provide a gear damper.

  In order to achieve the above object, a gear damper according to claim 1 of the present invention includes a bush having a rubber-like elastic body interposed between an inner sleeve and an outer sleeve, a hub fitted on the inner diameter side of the bush, A gear damper having a gear fitted to the outer diameter side of the bush, wherein a pin-shaped piece is attached so as to penetrate the rubber-like elastic body in the axial direction, and the diameter of the piece is the rubber The frame body is set larger than the thickness of the elastic body, and flanges are provided at both ends in the axial direction of the frame body, and the frame body on the inner diameter side of the frame body and on the outer diameter surface of the inner sleeve at the initial motion A recess is provided so that the inner sleeve and the inner sleeve do not contact each other, and a recess is provided on the outer diameter side of the piece body so that the outer body and the outer sleeve do not contact the inner sleeve at the initial movement. When the hub and the gear are relatively displaced in the circumferential direction, the inner surface of the recess is engaged with the frame body in the circumferential direction, so that the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. A restricting circumferential stopper structure is provided, and when the hub and the gear are relatively displaced in the axial direction, the outer sleeve or the gear is engaged in the axial direction with respect to one of the flanges and the other flange is On the other hand, an axial stopper structure is provided that restricts the relative axial displacement of the hub and the gear to a predetermined distance by engaging the inner sleeve or the hub in the axial direction.

  According to a second aspect of the present invention, there is provided a gear damper including a bush having a rubber-like elastic body interposed between an inner sleeve and an outer sleeve, a hub fitted to the inner diameter side of the bush, and an outer diameter side of the bush. A gear damper having a gear fitted thereto, and a pin-shaped piece is attached so as to penetrate the rubber-like elastic body in the axial direction, and the diameter of the piece is the thickness of the rubber-like elastic body. It is set smaller than the dimensions, and flanges are provided at both ends in the axial direction of the frame body, and the flange and the hub do not contact the outer diameter surface of the hub at the initial movement on the inner diameter side of the flange. A recess is provided on the outer diameter side of the flange and on the inner diameter surface of the gear so that the flange and the gear do not come into contact with each other at the initial movement, and the hub and the gear are arranged in the circumferential direction. When the relative displacement, A circumferential stopper structure is provided for restricting the relative displacement in the circumferential direction of the hub and the gear to a predetermined angle by engaging the inner surfaces of the respective portions in the circumferential direction, and the hub and the gear are relative to each other in the axial direction. When the outer sleeve or the gear is engaged with one of the flanges in the axial direction and the inner sleeve or the hub is engaged with the other flange in the axial direction when displaced, the hub and the gear are engaged. An axial stopper structure for limiting the relative displacement in the axial direction to a predetermined distance is provided.

  A gear damper according to a third aspect of the present invention is a gear damper in which a rubber-like elastic body is interposed between a hub and a gear disposed on the outer diameter side of the hub, and the rubber-like elastic body is disposed in the axial direction. A pin-shaped piece is mounted so as to penetrate, the diameter dimension of the piece is set larger than the thickness dimension of the rubber-like elastic body, and flanges are provided at both axial ends of the piece, A recess is provided on the outer diameter side of the frame body so that the frame body and the hub do not come into contact with each other on the outer diameter surface of the hub during initial movement. A recess is provided so that the frame and the gear do not come into contact with each other at the time of initial movement, and the inner surface of the recess engages with the frame in the circumferential direction when the hub and the gear are relatively displaced in the circumferential direction. As a result, the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. A circumferential stopper structure is provided to restrict the gear to one of the flanges when the hub and the gear are relatively displaced in the axial direction, and to the other flange. An axial stopper structure is provided that restricts the relative displacement in the axial direction of the hub and the gear to a predetermined distance by engaging the hub in the axial direction.

  A gear damper according to a fourth aspect of the present invention is a gear damper in which a rubber-like elastic body is interposed between a hub and a gear arranged on the outer diameter side of the hub, and the rubber-like elastic body is disposed in the axial direction. A pin-shaped piece is mounted so as to penetrate, the diameter dimension of the piece is set smaller than the thickness dimension of the rubber-like elastic body, and flanges are provided at both axial ends of the piece, A concave portion is provided on the outer diameter side of the flange portion so that the flange portion and the hub do not come into contact with each other on the outer diameter surface of the hub at the time of initial movement, and on the outer diameter side of the flange portion and on the inner diameter surface of the gear. A concave portion is provided so that the flange portion and the gear do not come into contact with each other during initial movement, and the inner surface of the concave portion engages with the flange portion in the circumferential direction when the hub and the gear are relatively displaced in the circumferential direction. As a result, the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. A circumferential stopper structure is provided to restrict the gear to one of the flanges when the hub and the gear are relatively displaced in the axial direction, and to the other flange. An axial stopper structure is provided that restricts the relative displacement in the axial direction of the hub and the gear to a predetermined distance by engaging the hub in the axial direction.

  Furthermore, a gear damper according to a fifth aspect of the present invention is the gear damper according to any one of the first to fourth aspects, wherein the pin-shaped piece is one end in the axial direction of the pipe-shaped piece body. One of the flanges is integrally formed, and the other flange is fixed to the other end in the axial direction.

  The gear damper according to claim 1 includes a bush having a rubber-like elastic body interposed between an inner sleeve and an outer sleeve, a hub fitted to the inner diameter side of the bush, and a gear fitted to the outer diameter side of the bush. Further, a pin-shaped piece is added to these. The pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction, and its diameter dimension is set larger than the thickness dimension of the rubber-like elastic body. In addition, a concave portion is provided on the outer diameter side of the frame body so that the inner frame and the inner sleeve do not come into contact with each other at the time of initial movement, and the outer diameter side of the frame body and the inner diameter surface of the outer sleeve. Is provided with a recess so that the frame and the outer sleeve do not come into contact with each other at the time of initial movement. When the hub and gear are displaced relative to each other in the circumferential direction and the relative displacement reaches a certain amount, the inner surfaces of the recesses are engaged with the frame in the circumferential direction. Acts as a stopper structure that limits relative displacement in the direction. In addition, since the flanges are provided at both ends in the axial direction of the pin-shaped piece body, when the hub and the gear are relatively displaced in the axial direction and the displacement reaches a certain amount, the outer side of the one flange is As a stopper structure in which the sleeve or gear is engaged in the axial direction and the inner sleeve or hub is engaged in the axial direction with respect to the other flange, thereby restricting further displacement of the hub and gear in the axial direction. Operate. Therefore, since the stopper structure operates in both the circumferential direction and the axial direction, the rubber-like elastic body is prevented from being excessively deformed.

  The gear damper according to claim 2 includes a bush having a rubber-like elastic body interposed between an inner sleeve and an outer sleeve, a hub fitted to the inner diameter side of the bush, and a gear fitted to the outer diameter side of the bush. Further, a pin-shaped piece is added to these. The pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction, and its diameter dimension is set smaller than the thickness dimension of the rubber-like elastic body. Corresponding to this, a recess is provided on the outer diameter surface of the hub on the inner diameter side of the flange so that the hub and the hub do not contact at the time of initial operation. A concave portion is provided on the inner diameter surface of the gear so that the flange portion and the gear do not come into contact with each other at the time of initial movement. When the hub and gear are displaced relative to each other in the circumferential direction and the relative displacement reaches a certain amount, the inner surfaces of the recesses are engaged with the flanges in the circumferential direction, respectively. Acts as a stopper structure that limits relative displacement in the direction. Further, as described above, since the flanges are provided at both axial ends of the pin-shaped piece body, when the hub and the gear are relatively displaced in the axial direction and the displacement reaches a certain amount, The outer sleeve or gear engages the shaft in the axial direction, and the inner sleeve or hub engages the other flange in the axial direction, thereby restricting the relative displacement of the hub and gear in the axial direction. Acts as a stopper structure. Therefore, since the stopper structure operates in both the circumferential direction and the axial direction, the rubber-like elastic body is prevented from being excessively deformed.

  In the gear damper according to the third aspect of the present invention, a rubber-like elastic body is interposed between the hub and a gear disposed on the outer diameter side of the hub, and a pin-shaped piece is further added thereto. The pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction, and its diameter dimension is set larger than the thickness dimension of the rubber-like elastic body. A recess is provided on the outer diameter surface of the frame body so that the frame body and the hub do not come into contact with each other at the time of initial movement, and on the outer diameter side of the frame body and on the inner diameter surface of the gear. A recess is provided so that the timepiece body and the gear do not contact each other. When the hub and gear are displaced relative to each other in the circumferential direction and the relative displacement reaches a certain amount, the inner surfaces of the recesses are engaged with the frame in the circumferential direction. Acts as a stopper structure that limits relative displacement in the direction. In addition, since the flanges are provided at both ends in the axial direction of the pin-shaped piece body, if the hub and the gear are relatively displaced in the axial direction and the displacement reaches a certain amount, the gears with respect to one of the flanges Engages in the axial direction and the hub engages in the axial direction with respect to the other flange, thereby acting as a stopper structure that restricts further displacement of the hub and gear in the axial direction. Therefore, since the stopper structure operates in both the circumferential direction and the axial direction, the rubber-like elastic body is prevented from being excessively deformed.

  In the gear damper according to the fourth aspect of the present invention, a rubber-like elastic body is interposed between a hub and a gear disposed on the outer diameter side of the hub, and a pin-shaped piece is further added thereto. The pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction, and its diameter dimension is set smaller than the thickness dimension of the rubber-like elastic body. Corresponding to this, a recess is provided on the outer diameter surface of the hub on the inner diameter side of the flange so that the hub and the hub do not contact at the time of initial operation. A concave portion is provided on the inner diameter surface of the gear so that the flange portion and the gear do not come into contact with each other at the time of initial movement. When the hub and gear are displaced relative to each other in the circumferential direction and the relative displacement reaches a certain amount, the inner surfaces of the recesses are engaged with the flanges in the circumferential direction, respectively. Acts as a stopper structure that limits relative displacement in the direction. Further, as described above, since the flanges are provided at both axial ends of the pin-shaped piece body, when the hub and the gear are relatively displaced in the axial direction and the displacement reaches a certain amount, The gear engages with the part in the axial direction and the hub engages with the other flange part in the axial direction, thereby acting as a stopper structure that limits the relative displacement of the hub and gear in the axial direction. . Therefore, since the stopper structure operates in both the circumferential direction and the axial direction, the rubber-like elastic body is prevented from being excessively deformed.

  Further, as common to each claim, the pin-shaped piece is provided with flanges at both ends in the axial direction. Since the frame is made of a rigid material such as metal, when providing the flanges at both ends in the axial direction of the frame, one flange is integrally formed at one axial end of the pipe-shaped frame body. At the same time, a structure in which the other flange is fixed to the other end in the axial direction by bolting or rivet caulking or the like is preferable, thereby making it possible to manufacture a stopper component having necessary and sufficient strength.

  The present invention has the following effects.

  That is, in the gear damper of the present invention, as described above, the stopper structure that restricts the relative displacement between the hub and the gear to a certain amount operates in both the circumferential direction and the axial direction. Deformation is prevented. Therefore, the rubber-like elastic body can be prevented from being damaged, and the torque transmission can be prevented from being interrupted.

The front view of the gear damper which concerns on 1st Example of this invention (A) and (B) both are explanatory drawings of the stopper structure in the same gear damper FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1 and showing a basic structure of the gear damper. FIG. 2 is an enlarged sectional view taken along line B-B in FIG. 1, showing a stopper structure in the gear damper. FIG. 5 is a cross-sectional view taken along a line CC in FIG. 4, showing a first moving posture of a circumferential stopper structure in the gear damper. Sectional drawing which shows the operating state of the circumferential direction stopper structure in the same gear damper Sectional drawing which shows the basic structure of the gear damper which concerns on 2nd Example of this invention. Sectional view showing the stopper structure of the gear damper DD line sectional view in FIG. FIG. 9 is a sectional view taken in the direction of arrow E in FIG. 8 and showing the initial movement posture of the circumferential stopper structure in the gear damper. Sectional drawing which shows the operating state of the circumferential direction stopper structure in the same gear damper Sectional drawing which shows the basic structure of the gear damper which concerns on 3rd Example of this invention. Sectional view showing the stopper structure of the gear damper FIG. 14 is a cross-sectional view taken along the line FF in FIG. 13, showing the initial posture of the circumferential stopper structure in the gear damper. Sectional drawing which shows the operating state of the circumferential direction stopper structure in the same gear damper Sectional drawing which shows the basic structure of the gear damper which concerns on 4th Example of this invention. Sectional view showing the stopper structure of the gear damper GG sectional view in FIG. FIG. 18 is a sectional view taken in the direction of the arrow H in FIG. 17 and showing the initial posture of the circumferential stopper structure in the gear damper. Sectional drawing which shows the operating state of the circumferential direction stopper structure in the same gear damper Half cut front view of gear damper according to conventional example

The present invention includes the following embodiments.
(1) The present invention relates to the field of gear dampers and to the field of vibration reduction dampers.
(2) In order to solve the above problems, the present invention has the following configuration.
(3) Displacement restriction in the torsional direction by embedding the pipe in the rubber part and / or displacement restriction in the axial direction by providing flanges at both ends of the pipe embedded in the rubber part.
(4) In addition to vulcanizing and bonding the flanged pipe in the rubber part, both the inner sleeve and outer sleeve are provided with notches in the axial and radial directions so that the flanged pipe can be embedded in the rubber part (multiple locations are possible) ). After vulcanization and bonding, flanges are provided at both ends of the pipe by attaching a disk-shaped flat plate with bolts on the opposite side of the flanged pipe (assuming that the inner diameter of the pipe is threaded) . However, d> t, where d is the pipe diameter and t is the radial width of the rubber part.
(5) A structure in which rubber is directly vulcanized and bonded to the hub and gear and a flanged pipe is embedded in the rubber is also conceivable. It is also conceivable that the flanged pipe embedded in the rubber part can be disassembled without being vulcanized and bonded so that it can be recycled.
(6) According to the present invention, when the torsion angle of the gear with respect to the hub increases, the flanged pipe embedded in the rubber part comes into contact with the notches provided in the inner sleeve and the outer sleeve, and the displacement in the torsional direction is reduced. It is possible to suppress idling of the drive shaft relative to the gear by being regulated and preventing damage to rubber. Also, when the axial displacement of the gear relative to the hub increases, the flange provided on the pipe comes into contact with the inner sleeve or the outer sleeve, and the displacement in the axial direction is restricted to prevent damage to the rubber, thereby preventing damage to the drive shaft relative to the gear. I can suppress idling.

(7) Supplement 1
(7-1) In the present invention, the displacement is not restricted by the reaction force of the rubber portion, but is controlled by the contact between the pipe and the sleeve (metals), so that it is more stable as a stopper. Function.
(7-2) As a comparative example, when the bearing mechanism is in contact with the hub and the vibration ring, the vibration from the hub is transmitted to the vibration ring through both the bearing mechanism and the rubber part. Since it is embedded in the rubber part, vibration from the inner sleeve is transmitted to the outer sleeve only through the rubber part.
(7-3) The material of the pipe is a rigid material such as metal, for example, steel (SPCC).

(8) Supplement 2
(8-1) Open a hole in the rubber part and pass a pin (pipe). Or vulcanize and bond the pin to the rubber part.
(8-2) A flange is provided on the pin, and the flange and the notched sleeve are torsionally deformed so that the hard materials are engaged with each other.
(8-3) In (8-2) above, the gear portion and the hub also have notches.
(8-4) In the above (8-1), the pin diameter d> the rubber width t, and the engagement is performed regardless of the flange.
(8-5) The outer sleeve is swollen to engage with the full width.
(8-6) For the above (8-4) and (8-5), a semicircular groove is machined to fit the gear and hub.
(8-7) Provide a flange to prevent the pin from coming off. In addition, notches for flanges are provided in the hub and gear. The flange regulates the displacement with respect to the input in the axial direction.

(9) When pin diameter d> rubber width t, a circumferential stopper is constituted by a combination of a pin and a notch (concave portion), and an axial stopper is constituted by a flange (ridge). In the case of pin diameter d <rubber width t, a circumferential stopper is constituted by a combination of a flange (ridge part) and a notch (concave part), and an axial stopper is constituted by the flange (ridge part).

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment (related to claim 1) ...
1 to 6 show a gear damper according to a first embodiment of the present invention. The gear damper according to the embodiment has a basic structure having a cross-sectional shape shown in FIG. 3, and a stopper structure 21 (21A, 21B) shown in FIG. 2 or 4 is provided on a part of the circumference thereof. ing. The stopper structures 21 (21A, 21B) are usually provided at a plurality of locations on the circumference, and in this embodiment, it is assumed that two locations are provided at 180 ° symmetrical positions as shown in FIG. ing.

Basic structure of gear damper
As shown in FIG. 3, an annular rubber-like elastic body 4 is interposed (vulcanized and bonded) between an inner sleeve 2 and an outer sleeve 3 to form a three-part integrated bush 1. A hub 5 is fitted to the inner diameter side of the gear 1 and a gear 6 is fitted to the outer diameter side of the bush 1. The sleeves 2 and 3, the hub 5 and the gear 6 are all annular parts made of a rigid material such as metal.

Stopper structure
As shown in FIG. 4, a pin-shaped piece body 22 is mounted so as to penetrate the rubber-like elastic body 4 in the axial direction. The diameter d of the frame body 22 is set to be greater than the radial thickness t (FIG. 3) of the rubber-like elastic body 4, that is, the radial interval between the inner sleeve 2 and the outer sleeve 3 (d> t). Correspondingly, as shown in FIG. 5, the frame body 22 and the inner sleeve 2 are not in direct contact with the outer diameter surface of the inner sleeve 2 on the inner diameter side of the frame body 22 in the initial movement posture of the damper. A recess 7 having a circular arc cross section is provided in the cross section so that the frame body 22 and the outer sleeve 3 are not in direct contact with the inner diameter surface of the outer sleeve 3 on the outer diameter side of the frame body 22 in the initial movement posture of the damper. An arcuate recess 8 is provided. The recesses 7 and 8 are each formed in a groove shape over the entire width in the axial direction from one end to the other end of the sleeves 2 and 3.

  Further, the inner sleeve 2 has a uniform thickness over the entire circumference. For this reason, the inner sleeve 2 bulges in an arc shape radially inward at the portion where the recess 7 is provided, and accommodates the bulged portion. Therefore, a correspondingly shaped recess 9 is provided on the outer diameter surface of the hub 5. The outer sleeve 3 also has a uniform thickness over the entire circumference. For this reason, the outer sleeve 3 swells in an arc shape radially outward at the portion where the recess 8 is provided. Is provided with a correspondingly shaped recess 10 on the inner diameter surface of the gear 6.

  As shown in FIG. 4, flanges 24 and 25 are provided at both ends in the axial direction of the piece 22 protruding from the rubber-like elastic body 4, so that the piece 22 is formed of a pipe-like piece body 23. One flange portion 24 is integrally formed at one end portion in the axial direction, and the other flange portion 25 made of an annular flat plate is fixed to the other end portion in the axial direction by bolting 26 or rivet caulking or the like. Yes. In this case, the diameter of the frame body 23 corresponds to the diameter d of the frame 22. The diameter of the flanges 24 and 25 is set to be larger than the radial interval between the inner sleeve 2 and the outer sleeve 3 in the portion where the recesses 7 and 8 are provided, and the hub in the portion where the recesses 9 and 10 are further provided. 5 is set to be larger than the radial interval between the gear 5 and the gear 6, so that the flange portions 24, 25 and the inner sleeve 2 and the outer sleeve 3, and further, the flange portions 24, 25, the hub 5 and the gear 6 are arranged in the axial direction. It is possible to engage. The frame body 22 to the frame body body 23 and the other flange 25 made of an annular flat plate are all made of a rigid material such as metal.

  In order to accommodate one flange 24 in the space between the hub 5 and the gear 6, a notch 2a is provided at one end in the axial direction of the inner sleeve 2, and the hub is located on the inner diameter side of the notch 2a. 5 also has a notch 5a. Further, a notch 3a is provided at one end of the outer sleeve 3 in the axial direction, and the gear 6 is also provided with a notch 6a located on the outer diameter side of the notch 3a. Further, in order to accommodate the other flange 25 in the space between the hub 5 and the gear 6, a notch 2b is provided at the other axial end of the inner sleeve 2, and is located on the inner diameter side of the notch 2b. The hub 5 is also provided with a notch 5b. Further, a notch 3b is provided at the other axial end of the outer sleeve 3, and the gear 6 is also provided with a notch 6b located on the outer diameter side of the notch 3b. Moreover, the notch part is also provided in the end surface of the rubber-like elastic body 4 so that it may show in figure.

  The flange portions 24 and 25 accommodated in the notches 2a, 2b, 3a, 3b, 5a, 5b, 6a and 6b are formed in the sleeves 2 and 3 when the hub 5 and the gear 6 are relatively displaced in the circumferential direction. The hub 5 and the gear 6 are not in contact with each other, but when the hub 5 and the gear 6 are relatively displaced in the axial direction, the hub 5 and the gear 6 are configured to engage with each other in the axial direction. When displaced in one axial direction, one or both of the outer sleeve 3 and the gear 6 are engaged with one flange 24 and one or both of the inner sleeve 2 and the hub 5 are engaged with the other flange 25. Engage. On the other hand, when the gear 6 is displaced in the other axial direction with respect to the hub 5, one or both of the outer sleeve 3 and the gear 6 are engaged with the other flange portion 25 and the inner portion with respect to one flange portion 24. Either one or both of the sleeve 2 and the hub 5 are configured to engage with each other.

  In the gear damper having the above-described configuration, when the hub 5 and the gear 6 are relatively displaced in the circumferential direction, the rubber-like elastic body 4 is elastically deformed. When the relative displacement reaches a certain amount, as shown in FIG. Actuates as a circumferential stopper structure 21A for restricting the relative displacement of the hub 5 and the gear 6 in the circumferential direction by engaging the inner surfaces of the recesses 7 and 8 with the body 23) in the circumferential direction. To do. At this time, when the rubber-like elastic body 4 is interposed between the piece body 22 (piece body main body 23) and the inner surfaces of the recesses 7 and 8, the rubber-like elastic body 4 is compressed to its limit. When the frame body 22 (frame body 23) and the inner surfaces of the recesses 7 and 8 are engaged and the rubber-like elastic body 4 is not interposed, the frame body 22 (frame body 23) and the inner surfaces of the recesses 7 and 8 are in direct contact. And engage. In this embodiment, since the rubber-like elastic body 4 is interposed between the piece body 22 (piece body main body 23) and the inner surfaces of the recesses 7 and 8, the piece of rubber-like elastic body 4 is compressed to its limit. The body 22 (frame body 23) and the inner surfaces of the recesses 7 and 8 are engaged.

  Further, when the hub 5 and the gear 6 are relatively displaced in the axial direction, the rubber-like elastic body 4 is elastically deformed. When the relative displacement reaches a certain amount, the outer sleeve 3 and the gear 6 with respect to the one flange portion 24 as described above. One or both of them engage and either one or both of the inner sleeve 2 and the hub 5 engage with the other flange 25, or conversely, the gear 6 with respect to the hub 5 in the other axial direction. When displaced, either one or both of the outer sleeve 3 and the gear 6 are engaged with the other flange 25, and either one or both of the inner sleeve 2 and the hub 5 are engaged with the one flange 24. As a result, the hub 5 and the gear 6 operate as an axial stopper structure 21B that restricts relative displacement in the axial direction. At this time, if the rubber-like elastic body 4 is interposed between the flange portions 24, 25 and the sleeves 2, 3, the flange-like portions 24, 25 in a state where the rubber-like elastic body 4 is compressed to the limit. When the rubber elastic body 4 is not interposed, the flange portions 24 and 25 and the sleeves 2 and 3 are brought into direct contact with each other and engaged. In this embodiment, since the rubber-like elastic body 4 is interposed between the one flange portion 24 and the sleeves 2 and 3, the flange-like portion 24 and the sleeve 2 in a state where the rubber-like elastic body 4 is compressed to the limit. , 3 are engaged, and the rubber-like elastic body 4 is not interposed between the other flange portion 25 and the sleeves 2, 3, so that the flange portion 25 and the sleeves 2, 3 are brought into direct contact and engage with each other.

  Therefore, as described above, since the stopper structures 21A and 21B operate in both the circumferential direction and the axial direction, the rubber-like elastic body 4 is not excessively deformed, and therefore the rubber-like elastic body 4 is damaged. It can be prevented in advance. The stopper structures 21A and 21B have high strength because the metal parts are engaged with each other.

Second embodiment (related to claim 2) ...
7 to 11 show a gear damper according to a second embodiment of the present invention. The gear damper according to the embodiment has a basic structure having a cross-sectional shape shown in FIG. 7, and stopper structures 21A and 21B shown in FIG. 8 are provided on a part of the circumference thereof. It should be noted that the stopper structures 21A and 21B are normally provided at a plurality of locations on the circumference, and in this embodiment, it is assumed that they are provided at two 180 ° symmetrical positions.

Basic structure of gear damper
As shown in FIG. 7, an annular rubber-like elastic body 4 is interposed (vulcanized and bonded) between the inner sleeve 2 and the outer sleeve 3 to form a three-part integral bush 1. A hub 5 is fitted to the inner diameter side of the gear 1 and a gear 6 is fitted to the outer diameter side of the bush 1. The sleeves 2 and 3, the hub 5 and the gear 6 are all annular parts made of a rigid material such as metal.

Stopper structure
As shown in FIG. 8, a pin-shaped piece body 22 is mounted so as to penetrate the rubber-like elastic body 4 in the axial direction. The diameter d of the frame body 22 is set smaller than the radial thickness dimension t of the rubber-like elastic body 4, that is, the radial interval between the inner sleeve 2 and the outer sleeve 3 (d <t). In the example, as shown in FIG. 9, the inner sleeve 2 and the outer sleeve 3 are not provided with a recess, and the hub 5 and the gear 6 are not provided with a recess. However, the inner sleeve 2 and the outer sleeve 3 have the same thickness over the entire circumference as in the first embodiment.

  As shown in FIG. 8, flanges 24 and 25 are provided at both ends in the axial direction of the piece 22 protruding from the rubber-like elastic body 4, so that the piece 22 is formed of a pipe-like piece body 23. One flange portion 24 is integrally formed at one end portion in the axial direction, and the other flange portion 25 made of an annular flat plate is fixed to the other end portion in the axial direction by bolting 26 or rivet caulking or the like. Yes. In this case, the diameter of the frame body 23 corresponds to the diameter d of the frame 22. The diameters of the flange portions 24 and 25 are set to be larger than the radial thickness dimension t of the rubber-like elastic body 4, that is, the radial interval between the inner sleeve 2 and the outer sleeve 3, and between the hub 5 and the gear 6. The distance between the flanges 24 and 25 and the inner sleeve 2 and the outer sleeve 3, and the flanges 24 and 25, the hub 5 and the gear 6 can be engaged in the axial direction. It is said that. The frame body 22 to the frame body body 23 and the other flange 25 made of an annular flat plate are all made of a rigid material such as metal.

  In order to accommodate one flange 24 in the space between the hub 5 and the gear 6, a notch 2a is provided at one end in the axial direction of the inner sleeve 2, and the hub is located on the inner diameter side of the notch 2a. 5 is provided with a recess 11 having an arcuate cross section. Further, a notch 3a is provided at one end of the outer sleeve 3 in the axial direction, and the gear 6 is also provided with a recess 12 having an arcuate cross section located on the outer diameter side of the notch 3a. Further, in order to accommodate the other flange 25 in the space between the hub 5 and the gear 6, a notch 2b is provided at the other axial end of the inner sleeve 2, and is located on the inner diameter side of the notch 2b. The hub 5 is provided with a recess 13 having an arcuate cross section. Further, a notch 3b is provided at the other end in the axial direction of the outer sleeve 3, and a recess 14 having an arcuate cross section is also provided in the gear 6 located on the outer diameter side of the notch 3b. The notch is also provided on the end surface of the rubber-like elastic body 4.

  And these notches 2a, 2b, 3a, 3b and the flanges 24, 25 accommodated in the recesses 11, 12, 13, 14 are recessed when the hub 5 and the gear 6 are relatively displaced in the circumferential direction. It is comprised so that it may engage with the inner surface of 11, 12, 13, and 14 in the circumferential direction. The flanges 24 and 25 are configured to engage with the hub 5 and the gear 6 in the axial direction when the hub 5 and the gear 6 are relatively displaced in the axial direction. In this case, either one or both of the outer sleeve 3 and the gear 6 are engaged with one of the flange portions 24, and either one or both of the inner sleeve 2 and the hub 5 are engaged with the other flange portion 25. On the other hand, when the gear 6 is displaced in the other axial direction with respect to the hub 5, one or both of the outer sleeve 3 and the gear 6 are engaged with the other flange portion 25 and the inner portion with respect to one flange portion 24. Either one or both of the sleeve 2 and the hub 5 are configured to engage with each other.

  In the gear damper having the above configuration, when the hub 5 and the gear 6 are relatively displaced in the circumferential direction, the rubber-like elastic body 4 is elastically deformed, and when the relative displacement reaches a certain amount, the flanges 24 and 25 are moved to each other as shown in FIG. On the other hand, the inner surfaces of the recesses 11, 12, 13, and 14 are respectively engaged in the circumferential direction, thereby operating as a circumferential stopper structure 21A that restricts relative displacement of the hub 5 and the gear 6 in the circumferential direction. To do. At this time, since the rubber-like elastic body 4 is not interposed between the flange portions 24 and 25 and the inner surfaces of the concave portions 11, 12, 13, and 14, both are brought into direct contact and engage with each other.

  Further, when the hub 5 and the gear 6 are relatively displaced in the axial direction, the rubber-like elastic body 4 is elastically deformed. When the relative displacement reaches a certain amount, the outer sleeve 3 and the gear 6 with respect to the one flange portion 24 as described above. One or both of them engage and either one or both of the inner sleeve 2 and the hub 5 engage with the other flange 25, or conversely, the gear 6 with respect to the hub 5 in the other axial direction. When displaced, either one or both of the outer sleeve 3 and the gear 6 are engaged with the other flange 25, and either one or both of the inner sleeve 2 and the hub 5 are engaged with the one flange 24. As a result, the hub 5 and the gear 6 operate as an axial stopper structure 21B that restricts relative displacement in the axial direction. At this time, if the rubber-like elastic body 4 is interposed between the flange portions 24, 25 and the sleeves 2, 3, the flange-like portions 24, 25 in a state where the rubber-like elastic body 4 is compressed to the limit. When the rubber elastic body 4 is not interposed, the flange portions 24 and 25 and the sleeves 2 and 3 are brought into direct contact with each other and engaged. In this embodiment, since the rubber-like elastic body 4 is interposed between the one flange portion 24 and the sleeves 2 and 3, the flange-like portion 24 and the sleeve 2 in a state where the rubber-like elastic body 4 is compressed to the limit. , 3 are engaged, and the rubber-like elastic body 4 is not interposed between the other flange portion 25 and the sleeves 2, 3, so that the flange portion 25 and the sleeves 2, 3 are brought into direct contact and engage with each other.

  Therefore, as described above, since the stopper structures 21A and 21B operate in both the circumferential direction and the axial direction, the rubber-like elastic body 4 is not excessively deformed, and therefore the rubber-like elastic body 4 is damaged. It can be prevented in advance. The stopper structures 21A and 21B have high strength because the metal parts are engaged with each other.

Third embodiment (related to claim 3) ...
12 to 15 show a gear damper according to a third embodiment of the present invention. The gear damper according to this embodiment has a basic structure having a cross-sectional shape shown in FIG. 12, and stopper structures 21A and 21B shown in FIG. 13 are provided on a part of the circumference thereof. It should be noted that the stopper structures 21A and 21B are normally provided at a plurality of locations on the circumference, and in this embodiment, it is assumed that they are provided at two 180 ° symmetrical positions.

Basic structure of gear damper
As shown in FIG. 12, an annular rubber-like elastic body 4 is interposed between the hub 5 and a gear 6 disposed on the outer diameter side of the hub 5 by means such as vulcanization adhesion or press fitting. The hub 5 and the gear 6 are both annular parts made of a rigid material such as metal. No sleeve is provided, and the gear damper according to this embodiment does not include an inner sleeve and an outer sleeve.

Stopper structure
As shown in FIG. 13, a pin-shaped piece body 22 is mounted so as to penetrate the rubber-like elastic body 4 in the axial direction. The diameter d of the frame 22 is set to be larger than the radial thickness t (FIG. 12) of the rubber-like elastic body 4, that is, the radial distance between the hub 5 and the gear 6 (d> t). Correspondingly, as shown in FIG. 14, the outer diameter surface of the hub 5 on the inner diameter side of the frame body 22 has an arcuate cross section so that the frame body 22 and the hub 5 do not directly contact in the initial movement posture of the damper. A concave portion 7 is provided, and a concave portion 8 having an arcuate cross section is also provided on the outer diameter side of the piece body 22 and also on the inner diameter surface of the gear 6 so that the piece body 22 and the gear 6 do not directly contact in the initial movement posture of the damper. It has been. The recesses 7 and 8 are each formed in a groove shape over the entire axial width from one end to the other end of the hub 5 and the gear 6.

  As shown in FIG. 13, flanges 24 and 25 are provided at both ends in the axial direction of the piece 22 projecting from the rubber-like elastic body 4, and thus the piece 22 is formed of a pipe-like piece body 23. One flange portion 24 is integrally formed at one end portion in the axial direction, and the other flange portion 25 made of an annular flat plate is fixed to the other end portion in the axial direction by bolting 26 or rivet caulking or the like. Yes. In this case, the diameter of the frame body 23 corresponds to the diameter d of the frame 22. The diameter of the flanges 24 and 25 is set to be larger than the radial distance between the hub 5 and the gear 6 in the portion where the recesses 7 and 8 are provided. 6 can be engaged in the axial direction. The frame body 22 to the frame body body 23 and the other flange 25 made of an annular flat plate are all made of a rigid material such as metal.

  In order to accommodate one flange 24 in the space between the hub 5 and the gear 6, a notch 5 a is provided at one end in the axial direction of the outer diameter surface of the hub 5, and one axial direction of the inner diameter surface of the gear 6 is provided. A notch 6a is also provided at the end of the. In order to accommodate the other flange 25 in the space between the hub 5 and the gear 6, a notch 5 b is provided at the other axial end of the outer diameter surface of the hub 5, and the shaft on the inner diameter surface of the gear 6 is provided. A notch 6b is also provided at the other end in the direction. The notch is also provided on the end surface of the rubber-like elastic body 4.

  The flanges 24 and 25 accommodated in the notches 5a, 5b, 6a and 6b do not contact either the hub 5 or the gear 6 when the hub 5 and the gear 6 are relatively displaced in the circumferential direction. When the hub 5 and the gear 6 are displaced relative to each other in the axial direction, the hub 5 and the gear 6 are configured to engage with each other in the axial direction. The gear 6 engages, and the hub 5 engages with the other flange 25. On the other hand, when the gear 6 is displaced in the other axial direction with respect to the hub 5, the gear 6 is engaged with the other flange 25 and the hub 5 is engaged with one flange 24. Yes.

  In the gear damper having the above configuration, when the hub 5 and the gear 6 are relatively displaced in the circumferential direction, the rubber-like elastic body 4 is elastically deformed, and when the relative displacement reaches a certain amount, as shown in FIG. Actuates as a circumferential stopper structure 21A for restricting the relative displacement of the hub 5 and the gear 6 in the circumferential direction by engaging the inner surfaces of the recesses 7 and 8 with the body 23) in the circumferential direction. To do. At this time, when the rubber-like elastic body 4 is interposed between the piece body 22 (piece body main body 23) and the inner surfaces of the recesses 7 and 8, the rubber-like elastic body 4 is compressed to its limit. When the frame body 22 (frame body 23) and the inner surfaces of the recesses 7 and 8 are engaged and the rubber-like elastic body 4 is not interposed, the frame body 22 (frame body 23) and the inner surfaces of the recesses 7 and 8 are in direct contact. And engage. In this embodiment, since the rubber-like elastic body 4 is interposed between the piece body 22 (piece body main body 23) and the inner surfaces of the recesses 7 and 8, the piece of rubber-like elastic body 4 is compressed to its limit. The body 22 (frame body 23) and the inner surfaces of the recesses 7 and 8 are engaged.

  Further, when the hub 5 and the gear 6 are relatively displaced in the axial direction, the rubber-like elastic body 4 is elastically deformed, and when the relative displacement reaches a certain amount, the gear 6 is engaged with the one flange portion 24 as described above. In addition, the hub 5 is engaged with the other flange 25, or conversely, when the gear 6 is displaced in the other axial direction with respect to the hub 5, the gear 6 is engaged with the other flange 25 and one of the flanges is engaged. The hub 5 is engaged with the portion 24, thereby operating as an axial stopper structure 21B that limits the relative displacement of the hub 5 and the gear 6 in the axial direction. At this time, when the rubber-like elastic body 4 is interposed between the flange portions 24, 25 and the hub 5 and the gear 6, the flange-like portion 24 is compressed to the limit. 25, the hub 5 and the gear 6 are engaged, and when the rubber-like elastic body 4 is not interposed, the flange portions 24, 25, the hub 5 and the gear 6 are brought into direct contact and engaged. In this embodiment, since the rubber-like elastic body 4 is interposed between the one flange portion 24 and the hub 5 and the gear 6, the rubber-like elastic body 4 is compressed to the limit with the flange portion 24. Since the hub 5 and the gear 6 are engaged, and the rubber-like elastic body 4 is not interposed between the other flange 25 and the hub 5 and the gear 6, the flange 25, the hub 5 and the gear 6 are directly connected to each other. Engage in contact.

  Therefore, as described above, since the stopper structures 21A and 21B operate in both the circumferential direction and the axial direction, the rubber-like elastic body 4 is not excessively deformed, and therefore the rubber-like elastic body 4 is damaged. It can be prevented in advance. The stopper structures 21A and 21B have high strength because the metal parts are engaged with each other.

Fourth embodiment (related to claim 4) ...
16 to 20 show a gear damper according to a fourth embodiment of the present invention. The gear damper according to this embodiment has a basic structure having a cross-sectional shape shown in FIG. 16, and stopper structures 21A and 21B shown in FIG. 17 are provided on a part of the circumference thereof. It should be noted that the stopper structures 21A and 21B are normally provided at a plurality of locations on the circumference, and in this embodiment, it is assumed that they are provided at two 180 ° symmetrical positions.

Basic structure of gear damper
As shown in FIG. 16, an annular rubber-like elastic body 4 is interposed between the hub 5 and a gear 6 disposed on the outer diameter side of the hub 5 by means such as vulcanization adhesion or press fitting. The hub 5 and the gear 6 are both annular parts made of a rigid material such as metal. No sleeve is provided, and the gear damper according to this embodiment does not include an inner sleeve and an outer sleeve.

Stopper structure
As shown in FIG. 17, a pin-shaped piece body 22 is mounted so as to penetrate the rubber-like elastic body 4 in the axial direction. The diameter d of the piece 22 is set smaller than the radial thickness t of the rubber-like elastic body 4, that is, the radial distance between the hub 5 and the gear 6 (d <t). As shown in FIG. 18, the hub 5 and the gear 6 are not provided with a recess.

  As shown in FIG. 17, flanges 24 and 25 are provided at both ends in the axial direction of the piece 22 protruding from the rubber-like elastic body 4, so that the piece 22 is formed of a pipe-like piece body 23. One flange 24 is integrally formed at one end in the axial direction, and the other flange 25 made of an annular flat plate is bolted 26 or rivet caulked at the other end in the axial direction. . In this case, the diameter of the frame body 23 corresponds to the diameter d of the frame 22. The diameter dimension of the flange parts 24 and 25 is set to be larger than the radial thickness dimension t of the rubber-like elastic body 4, that is, the radial distance between the hub 5 and the gear 6. 5 and the gear 6 can be engaged in the axial direction. The frame body 22 to the frame body body 23 and the other flange 25 made of an annular flat plate are all made of a rigid material such as metal.

  In order to accommodate one flange 24 in the space between the hub 5 and the gear 6, a concave portion 11 having an arc-shaped cross section is provided at one end in the axial direction of the outer diameter surface of the hub 5. A concave portion 12 having an arcuate cross section is also provided at one end in the axial direction. Further, in order to accommodate the other flange 25 in the space between the hub 5 and the gear 6, a recess 13 having an arc-shaped cross section is provided at the other end in the axial direction of the outer diameter surface of the hub 5. A concave portion 14 having an arc cross section is also provided at the other axial end of the surface. Further, a notch is provided on the end surface of the rubber-like elastic body 4.

  And the collar parts 24 and 25 accommodated in these recessed parts 11, 12, 13, and 14 are the inner surfaces of these recessed parts 11, 12, 13, and 14 when the hub 5 and the gear 6 are relatively displaced in the circumferential direction. It is configured to engage in the circumferential direction. The flanges 24 and 25 are configured to engage with the hub 5 and the gear 6 in the axial direction when the hub 5 and the gear 6 are relatively displaced in the axial direction. When this occurs, the gear 6 is engaged with one of the flanges 24 and the hub 5 is engaged with the other flange 25. On the other hand, when the gear 6 is displaced in the other axial direction with respect to the hub 5, the gear 6 is engaged with the other flange 25 and the hub 5 is engaged with one flange 24. Yes.

  In the gear damper having the above-described configuration, when the hub 5 and the gear 6 are relatively displaced in the circumferential direction, the rubber-like elastic body 4 is elastically deformed. When the relative displacement reaches a certain amount, as shown in FIG. On the other hand, the inner surfaces of the recesses 11, 12, 13, and 14 are respectively engaged in the circumferential direction, thereby operating as a circumferential stopper structure 21A that restricts relative displacement of the hub 5 and the gear 6 in the circumferential direction. To do. At this time, since the rubber-like elastic body 4 is not interposed between the flange portions 24 and 25 and the inner surfaces of the concave portions 11, 12, 13, and 14, both are brought into direct contact and engage with each other.

  Further, when the hub 5 and the gear 6 are relatively displaced in the axial direction, the rubber-like elastic body 4 is elastically deformed, and when the relative displacement reaches a certain amount, the gear 6 is engaged with the one flange portion 24 as described above. In addition, the hub 5 is engaged with the other flange 25, or conversely, when the gear 6 is displaced in the other axial direction with respect to the hub 5, the gear 6 is engaged with the other flange 25 and one of the flanges is engaged. The hub 5 is engaged with the portion 24, thereby operating as an axial stopper structure 21B that limits the relative displacement of the hub 5 and the gear 6 in the axial direction. At this time, when the rubber-like elastic body 4 is interposed between the flange portions 24, 25 and the hub 5 and the gear 6, the flange-like portion 24 is compressed to the limit. 25, the hub 5 and the gear 6 are engaged, and when the rubber-like elastic body 4 is not interposed, the flange portions 24, 25, the hub 5 and the gear 6 are brought into direct contact and engaged. In this embodiment, since the rubber-like elastic body 4 is interposed between the one flange portion 24 and the hub 5 and the gear 6, the rubber-like elastic body 4 is compressed to the limit with the flange portion 24. Since the hub 5 and the gear 6 are engaged, and the rubber-like elastic body 4 is not interposed between the other flange 25 and the hub 5 and the gear 6, the flange 25, the hub 5 and the gear 6 are directly connected to each other. Engage in contact.

  Therefore, as described above, since the stopper structures 21A and 21B operate in both the circumferential direction and the axial direction, the rubber-like elastic body 4 is not excessively deformed, and therefore the rubber-like elastic body 4 is damaged. It can be prevented in advance. The stopper structures 21A and 21B have high strength because the metal parts are engaged with each other.

DESCRIPTION OF SYMBOLS 1 Bush 2 Inner sleeve 2a, 2b, 3a, 3b, 5a, 5b, 6a, 6b Notch 3 Outer sleeve 4 Rubber-like elastic body 5 Hub 6 Gear 7, 8, 11, 12, 13, 14 Recess 9, 10 Recess 21 Stopper Structure 21A Circumferential Stopper Structure 21B Axial Stopper Structure 22 Frame 23 Frame Body 24, 25 Gutter 26 Bolt Fixing

Claims (5)

A gear damper having a bush having a rubber-like elastic body interposed between an inner sleeve and an outer sleeve, a hub fitted to the inner diameter side of the bush, and a gear fitted to the outer diameter side of the bush. And
A pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction,
The diameter dimension of the piece body is set larger than the thickness dimension of the rubber-like elastic body, and flanges are provided at both ends in the axial direction of the piece body,
A concave portion is provided on the inner diameter side of the piece body so that the piece body and the inner sleeve do not contact the outer diameter surface of the inner sleeve at the time of initial movement,
A concave portion is provided on the outer diameter side of the piece body so that the piece body and the outer sleeve do not come into contact with the inner diameter surface of the outer sleeve at the time of initial movement.
When the hub and the gear are relatively displaced in the circumferential direction, the inner surface of the recess is engaged with the frame body in the circumferential direction, so that the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. Restricted circumferential stopper structure is provided,
When the hub and the gear are relatively displaced in the axial direction, the outer sleeve or the gear is engaged with one of the flanges in the axial direction, and the inner sleeve or the hub is engaged with the other flange in the axial direction. The gear damper is characterized in that an axial stopper structure is provided for limiting the axial relative displacement of the hub and the gear to a predetermined distance. A gear damper having a bush having a rubber-like elastic body interposed between an inner sleeve and an outer sleeve, a hub fitted to the inner diameter side of the bush, and a gear fitted to the outer diameter side of the bush. And
A pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction,
The diameter dimension of the piece body is set smaller than the thickness dimension of the rubber-like elastic body, and flanges are provided at both axial ends of the piece body,
A recess is provided on the inner diameter side of the flange and on the outer diameter surface of the hub so that the flange and the hub do not come into contact with each other at the initial operation,
A concave portion is provided on the outer diameter side of the collar portion so that the collar portion and the gear do not come into contact with the inner diameter surface of the gear at the initial movement.
When the hub and the gear are relatively displaced in the circumferential direction, the inner surface of the recess is engaged with the flange in the circumferential direction, so that the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. Restricted circumferential stopper structure is provided,
When the hub and the gear are relatively displaced in the axial direction, the outer sleeve or the gear is engaged with one of the flanges in the axial direction, and the inner sleeve or the hub is engaged with the other flange in the axial direction. The gear damper is characterized in that an axial stopper structure is provided for limiting the axial relative displacement of the hub and the gear to a predetermined distance. A gear damper having a rubber-like elastic body interposed between a hub and a gear arranged on the outer diameter side of the hub,
A pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction,
The diameter dimension of the piece body is set larger than the thickness dimension of the rubber-like elastic body, and flanges are provided at both ends in the axial direction of the piece body,
A concave portion is provided on the inner diameter side of the piece body so that the piece body and the hub do not come into contact with the outer diameter surface of the hub during initial movement,
A concave portion is provided on the outer diameter side of the piece body so that the piece body and the gear do not come into contact with the inner diameter surface of the gear at the time of initial movement,
When the hub and the gear are relatively displaced in the circumferential direction, the inner surface of the recess is engaged with the frame body in the circumferential direction, so that the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. Restricted circumferential stopper structure is provided,
When the hub and the gear are relatively displaced in the axial direction, the gear engages in the axial direction with respect to one of the flanges, and the hub engages in the axial direction with respect to the other flange. A gear damper, characterized in that an axial stopper structure for limiting the axial relative displacement of the hub and gear to a predetermined distance is provided. A gear damper having a rubber-like elastic body interposed between a hub and a gear arranged on the outer diameter side of the hub,
A pin-shaped piece is mounted so as to penetrate the rubber-like elastic body in the axial direction,
The diameter dimension of the piece body is set smaller than the thickness dimension of the rubber-like elastic body, and flanges are provided at both axial ends of the piece body,
A recess is provided on the inner diameter side of the flange and on the outer diameter surface of the hub so that the flange and the hub do not come into contact with each other at the initial operation,
A concave portion is provided on the outer diameter side of the collar portion so that the collar portion and the gear do not come into contact with the inner diameter surface of the gear at the initial movement.
When the hub and the gear are relatively displaced in the circumferential direction, the inner surface of the recess is engaged with the flange in the circumferential direction, so that the relative displacement in the circumferential direction of the hub and the gear is reduced to a predetermined angle. Restricted circumferential stopper structure is provided,
When the hub and the gear are relatively displaced in the axial direction, the gear engages in the axial direction with respect to one of the flanges, and the hub engages in the axial direction with respect to the other flange. A gear damper, characterized in that an axial stopper structure for limiting the axial relative displacement of the hub and gear to a predetermined distance is provided. The gear damper according to any one of claims 1 to 4,
The pin-shaped piece body has a structure in which one flange portion is integrally formed at one end portion in the axial direction of the pipe-shaped piece body and the other flange portion is fixed to the other end portion in the axial direction. Characteristic gear damper.

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