JP2017219055A - Gear Damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear damper 1 in which a twisting rigidity of a damper main body 13 is increased without complicating the structure and a tooth striking sound can be effectively reduced.SOLUTION: There is provided a structure in which a damper main body 13 made of rubber elastic material extending in endless manner in peripheral directions of an inner sleeve 11 at a shaft side and an outer sleeve 12 at a gear side that are arranged coaxially to each other and can be displaced to each other in a peripheral direction between these inner sleeve 11 and outer sleeve 12. The inner sleeve 11 is provided with several outward protrusions 111 protruded in a radial outer direction in a predetermined spacing in a peripheral direction and the outer sleeve 12 is provided with several inward protrusions 121 protruded inward in a radial direction in a specified spacing in a peripheral direction, the damper main body 13 is adhered to at least one of the outward protrusions 111 and the inward protrusions 121 and can be compressed and deformed in a peripheral direction between the outward protrusions 111 and the inward protrusions 121.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gear damper that reduces vibration and rattling noise generated in a gear.

  Conventionally, in a transfer of a four-wheel drive vehicle, for example, as an anti-vibration device provided to reduce the rattling noise caused by vibration caused by backlash or the like in the gear and absorb fluctuations in transmission torque, A structure in which a damper main body made of a rubber elastic body is interposed between an outer sleeve that is integrally fitted to the circumference and an inner sleeve that is integrally fitted to the outer circumference of the shaft. A gear damper provided is known (see, for example, the following prior art document).

  However, the conventional gear damper has a complicated structure in order to improve torque transmission force and durability, and to suppress the occurrence of rattling noise caused by gear backlash and the like.

Japanese Utility Model Publication No. 63-56359

  The present invention has been made in view of the above points, and its technical problem is to increase the torsional rigidity of the damper main body and effectively reduce the rattling noise without complicating the structure. It is to provide a gear damper capable of this.

  As a means for solving the above-described technical problem, a gear damper according to claim 1 includes a shaft-side inner sleeve and a gear-side outer sleeve arranged concentrically with each other and capable of relative displacement in the circumferential direction. A damper body made of a rubber elastic body extending endlessly in the circumferential direction of the inner sleeve and the outer sleeve is interposed between the inner sleeve and the outer sleeve, and protrudes radially outward at predetermined intervals in the circumferential direction. A plurality of outward projections are provided, the outer sleeve is provided with a plurality of inward projections protruding radially inward at predetermined circumferential intervals, and the damper main body includes the outward projection and the inward projection. It is bonded to at least one, and is compressible and deformable in a circumferential direction between the outward projection and the inward projection.

  According to a second aspect of the present invention, the gear damper according to the first aspect is characterized in that the damper main body is pre-compressed in the radial direction.

  A gear damper according to a third aspect is characterized in that, in the configuration described in the first or second aspect, the damper main body is fitted to the inner sleeve or the outer sleeve with an appropriate margin.

  According to the gear damper of the present invention, since the damper main body becomes a compression spring in the circumferential direction between the outward projection and the inward projection, a high torsional rigidity is obtained with a simple structure. It is possible to effectively suppress the vibration of the gear that causes hitting and improve the torque transmission force and durability.

It is the figure which looked at 1st embodiment of the gear damper which concerns on this invention from the direction parallel to an axial center. It is II-II 'sectional drawing in FIG. FIG. 3 is a sectional view taken along line III-III ′ in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV ′ in FIG. 1. It is the figure which looked at 2nd embodiment of the gear damper which concerns on this invention from the direction parallel to an axial center. It is the figure which looked at 2nd embodiment of the gear damper which concerns on this invention from the direction parallel to an axial center in the unfitted state of an outer sleeve and a damper main body.

  Hereinafter, a preferred embodiment of a gear damper according to the present invention will be described with reference to the drawings. 1 to 4 show the first embodiment.

  1 to 4, a gear damper 1 is disposed, for example, in a transfer of a four-wheel drive vehicle. Reference numeral 2 is a shaft-side inner housing (not shown), and reference numeral 3 is an inner housing. 2 is an outer housing on the gear side (not shown) arranged on the outer peripheral side of the motor. The gear damper 1 is disposed on the inner peripheral surface of the inner sleeve 11 on the outer periphery of the inner housing 2, and is disposed concentrically and on the outer peripheral side of the inner sleeve 11 so as to be capable of relative displacement in the circumferential direction. An outer sleeve 12 attached to the inner peripheral surface of the inner sleeve 11 and a damper main body 13 provided integrally between the inner sleeve 11 and the outer sleeve 12 and extending endlessly in the circumferential direction.

  The inner sleeve 11 is made of metal, and has a plurality of (four in the example of FIG. 1) outward projections 111 projecting radially outward at predetermined intervals in the circumferential direction (90 ° in the example of FIG. 1). Is formed.

  The outer sleeve 12 is made of the same metal as that of the inner sleeve 11, and a plurality of (four in the example of FIG. 1) projecting inward in the radial direction at a predetermined interval in the circumferential direction (90 ° interval in the example of FIG. 1). The inward projection 121 is formed.

  The virtual circumference that is concentric with the inner sleeve 11 and passes through the outer diameter end portion 111a of the outward projection 111 is smaller in diameter than the inner peripheral surface of the portion (cylindrical body portion) 122 other than the inward projection 121 in the outer sleeve 12. The imaginary circumference passing through the inner diameter end 121a of the inward projection 121 concentrically with the outer sleeve 12 is larger than the outer peripheral surface of the portion (cylindrical main body portion) 112 other than the inward projection 111 in the inner sleeve 11. . Further, when no torque is input, as shown in FIG. 1, the outward projection 111 is at the intermediate position in the circumferential direction between the inward projections 121, 121, in other words, the inward projection 121 is outward. It exists in the circumferential direction intermediate position between protrusion 111,111.

  The damper main body 13 is made of a rubber elastic body, and is vulcanized and bonded to both the outer peripheral surface of the inner sleeve 11 including the outward protrusion 111 and the inner peripheral surface of the outer sleeve 12 including the inward protrusion 121. Yes. That is, the damper main body 13 is formed by filling an unvulcanized rubber material (not shown) in which an inner sleeve 11 and an outer sleeve 12 are positioned and filling them with an unvulcanized rubber material, and curing the inner sleeve simultaneously with molding. 11 and the outer sleeve 12 are integrally vulcanized and bonded.

  Therefore, as shown in FIGS. 1 and 2, the damper main body 13 includes an inner diameter side thin portion 131 positioned between the inward projection 121 of the outer sleeve 12 and the cylindrical main body portion 112 of the inner sleeve 11, and FIGS. 4, the outer diameter side thin portion 132 positioned between the outward protrusion 111 of the inner sleeve 11 and the cylindrical main body portion 122 of the outer sleeve 12, and the inner sleeve 11 as shown in FIGS. 1 and 3. Between the outer circumferential projections 111 of the inner sleeve 11 and the inner circumferential projections 121 of the outer sleeve 12. And a thick wall portion 133 located in the area.

  Further, the thick portion 133 is formed on both sides in the circumferential direction of the outward projection 111 of the inner sleeve 11, in other words, on both sides in the circumferential direction of the inward projection 121 of the outer sleeve 12.

  The damper main body 13 is vulcanized and bonded only to the outward projection 111 of the inner sleeve 11 and the inward projection 121 of the outer sleeve 12, and the outer peripheral surface of the cylindrical main body portion 112 of the inner sleeve 11 and the cylindrical shape of the outer sleeve 12. The inner peripheral surface of the main body portion 122 may not be bonded.

  Further, the damper main body 13 is appropriately compressed in the radial direction by a method such as drawing the outer sleeve 12 or expanding the diameter of the inner sleeve 11 after molding with a vulcanization mold. ing.

  The gear damper 1 of the first embodiment configured as described above includes a damper between the inner sleeve 11 attached to the inner housing 2 on the shaft side and the outer sleeve 12 attached to the outer housing 3 on the gear side. Torque is transmitted through the main body 13, and fluctuations in the torque are absorbed by deformation of the damper main body 13.

  For example, when torque is input from the inner housing 2 in the clockwise direction in FIG. 1, when the torque rapidly increases, the inner sleeve 11 is in the process of being transmitted to a gear (not shown) on the outer peripheral side. The side surface 111b which is the front surface in the rotational direction of the outward projection 111 presses the thick portion 133 in the damper main body 13, so that the thick portion 133 becomes the rear surface in the rotational direction of the inward projection 121 of the outer sleeve 12. Since the compression reaction force of the thick portion 133 increases nonlinearly with the side surface 121b in the circumferential direction, and the thick portion 133 is pre-compressed so that the torsional rigidity is high. Therefore, excellent torque transmission force and durability are achieved.

  On the other hand, the thick portion 133 is deformed in the pulling direction between the side surface 111c which is the rear surface in the rotation direction of the outward projection 111 of the inner sleeve 11 and the side surface 121c which is the front surface in the rotation direction of the inward projection 121 of the outer sleeve 12. However, as described above, since the thick portion 133 is pre-compressed, it is difficult to generate a large tensile stress, and this point is also excellent in durability.

  Further, as described above, the torsional rigidity of the damper main body 13 is increased. As a result, when torsional vibration is input, resistance torque against rattling caused by gear backlash and the like is increased, so that the function of preventing rattling noise is also provided. Can be increased.

  Next, FIG.5 and FIG.6 shows 2nd embodiment of the gear damper based on this invention. In the gear damper 1 of the second embodiment, the difference from the first embodiment described above is that the damper main body 13 is integrally vulcanized and bonded to the outer peripheral surface of the inner sleeve 11, and is attached to the outer sleeve 12. The point is that it is press-fitted.

  Specifically, the damper main body 13 is made of a rubber elastic body that is continuous in the circumferential direction, and is vulcanized and bonded to the outer peripheral surface of the inner sleeve 11 including the outward projection 111, that is, the inner sleeve 11 is positioned. A vulcanized molding die (not shown) is placed and filled with an unvulcanized rubber material and crosslinked and cured, so that it is integrally vulcanized and bonded to the inner sleeve 11 simultaneously with molding.

  The damper main body 13 includes an inner diameter side thin portion 131 positioned between the inward protrusion 121 of the outer sleeve 12 and the cylindrical main body portion 112 of the inner sleeve 11, and the outer protrusion 111 of the inner sleeve 11 and the cylinder of the outer sleeve 12. An outer diameter-side thin portion 132 that is located between the cylindrical main body portions 122 and is constricted to the outer diameter side, and between the radially opposing surfaces of the cylindrical main body portion 112 of the inner sleeve 11 and the cylindrical main body portion 122 of the outer sleeve 12. In other words, it has the thick portion 133 located between the outwardly facing projection 111 of the inner sleeve 11 and the circumferentially facing surface of the inwardly projecting 121 of the outer sleeve 12.

  In the unfitted state with the outer sleeve 12 shown in FIG. 6, the radial thickness t of the thick portion 133 is equal to the outer peripheral surface of the cylindrical body portion 112 of the inner sleeve 11 and the outer sleeve in the assembled state shown in FIG. 12 is slightly larger than the radial facing distance L with respect to the inner peripheral surface of the cylindrical body portion 122, that is, the damper main body 13 has an appropriate tightening margin in the thick portion 133 with respect to the cylindrical body portion 122 of the outer sleeve 12. The thick wall portion 133 of the damper main body 13 is press-fitted and fitted to the inner peripheral surface, whereby the radial pre-compression is given by the above-described tightening allowance (t−L).

  Further, between the outer peripheral surface of the inner diameter side thin portion 131 in the damper main body 13 and the inner diameter end portion 121 a of the inward projection 121 of the outer sleeve 12, and the outer peripheral surface of the outer diameter side thin portion 132 in the damper main body 13, Between the inner peripheral surface of the cylindrical main body portion 122, there are gaps δ1 and δ2.

  That is, since the gear damper 1 of the second embodiment has the above-described configuration, the same operation and effect as the first embodiment are achieved. Since the damper main body 13 is not bonded to the outer sleeve 12, for example, when torque is input from the inner housing 2 in the clockwise direction in FIG. 5, the rear surface in the rotational direction of the outward projection 111 of the inner sleeve 11. The tensile stress is not generated in the thick portion 133 between the side surface 111c that becomes and the side surface 121c that is the front surface in the rotational direction of the inward projection 121 of the outer sleeve 12.

  In addition, the press-fitting resistance is suppressed by the gaps δ1 and δ2 in the process of assembling as shown in FIG. 5 by press-fitting the integrally molded product 10 of the inner sleeve 11 and the damper main body 13 shown in FIG. Therefore, the assembly work can be easily performed.

  In the first embodiment and the second embodiment described above, the outer sleeve 12 has been described as being attached to the outer housing 3 on the gear side, but the present invention is not limited to this, For example, the outer sleeve 12 may also serve as an outer housing on the gear side.

  In the second embodiment, the integrally molded product 10 of the inner sleeve 11 and the damper main body 13 is press-fitted and fitted to the outer sleeve 12. On the contrary, the outer sleeve 12 and the damper main body A structure integrally formed with the inner sleeve 11 may be press-fitted into the inner sleeve 11.

DESCRIPTION OF SYMBOLS 1 Gear damper 10 Integrated molding 11 Inner sleeve 111 Outward protrusion 112 Cylindrical main-body part 12 Outer sleeve 121 Inward protrusion 122 Cylindrical main-body part 13 Damper main body 131 Inner diameter side thin part 132 Outer diameter side thin part 133 Thick part 2 Inner Housing 3 Outer housing

Claims (3)

  A rubber elastic body extending endlessly in the circumferential direction of the inner sleeve and the outer sleeve between the inner sleeve on the shaft side and the outer sleeve on the gear side, which are arranged concentrically and mutually displaceable in the circumferential direction. The inner sleeve is provided with a plurality of outward projections projecting radially outward at predetermined circumferential intervals, and the outer sleeve is radially disposed at predetermined circumferential intervals. A plurality of inward projections projecting inward are provided, and the damper main body is bonded to at least one of the outward projection and the inward projection, and a circumference is formed between the outward projection and the inward projection. A gear damper characterized by being compressible and deformable in the direction.   The gear damper according to claim 1, wherein the damper main body is pre-compressed in a radial direction.   The gear damper according to claim 1, wherein the damper main body is fitted to the inner sleeve or the outer sleeve with an appropriate tightening margin.

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