JP2020125810A - Gear damper - Google Patents

Abstract

To provide a gear damper which enables reduction of a radial width of the gear damper and can meet a request for space saving of devices.SOLUTION: An inner plate 13 which is fixed to an inner periphery side rotary member 51 and rotates with the inner periphery side rotary member 51 and an outer plate 23 which is fixed to an outer periphery side rotary member 61 and rotates with the outer periphery side rotary member 61 are disposed so as to face each other in an axial direction. The inner plate 13 is provided with an inner side protruding part 14 protruding to one axial side toward the outer plate 23, and the outer plate 23 is provided with an outer side protruding part 24 protruding to the opposite side in the axial direction toward the inner plate 13. The protruding parts 14, 24 are disposed at positions on a circumference which partially overlap with each other. An elastic body 31 is disposed between the protruding parts 14, 24.SELECTED DRAWING: Figure 2

Description

The present invention relates to a gear damper.

For example, when gear gear rattle is generated in an oil environment inside a transfer device of a vehicle such as an automobile, there is a method of applying a pre-torque to the gear to reduce the gear rattle.

However, according to this method, there is a concern that the fuel consumption will be deteriorated by applying the pre-torque.

Therefore, a gear damper is used as another measure to reduce the gear rattling noise.

The gear damper has a structure in which an outer peripheral rotating member such as a gear main body or a housing holding the gear main body is coaxially and relatively rotatably arranged on the outer peripheral side of an inner peripheral rotating member such as a shaft. Protrusions are provided on the outer peripheral side toward the outside in the radial direction, and convex portions are provided on the inner peripheral side of the outer peripheral side rotating member toward the inside in the radial direction. An elastic body made of a rubber-like elastic material is interposed between the parts, and by the buffering effect exerted by the elastic body which is compressed in the circumferential direction between the both convex portions when both rotating members rotate relative to each other. It is possible to reduce gear rattling noise.

JP, 2005-106086, A

According to the gear damper, the following disadvantages are pointed out.

Generally, for a gear damper, it is necessary to set the torsional rigidity (circumferential direction spring characteristic) of the elastic body to be high in order to reduce the gear rattling noise. It is desirable to design using a compression component having a higher elastic modulus.

On the other hand, there is a demand for space saving in vehicle equipment from the viewpoint of fuel efficiency, weight reduction, and size reduction in recent years, and there is a demand for reducing the installation space for gear dampers as much as possible.

Regarding the reduction of the installation space In the gear damper with the above-mentioned configuration, both convex portions provided to compress the elastic body in the circumferential direction in order to utilize the compression component of the elastic body are arranged radially outward or radially inward from the rotating member. It is provided so as to project toward. Therefore, it is difficult to reduce the radial width of the gear damper, and it may not be possible to save space particularly in the radial direction.

An object of the present invention is to provide a gear damper that can reduce the radial width of the gear damper and can meet the demand for space saving of equipment.

The gear damper of the present invention is fixed to an inner peripheral side rotating member, is fixed to an inner plate rotating with the inner peripheral side rotating member, and an outer peripheral side rotating member arranged on the outer peripheral side of the inner peripheral side rotating member, An outer plate that rotates together with the outer peripheral side rotation member and is arranged so as to face the inner plate in the axial direction; and an inner side convex portion provided on the inner plate so as to project toward the outer plate in one axial direction. , An outer projection provided on the outer plate so as to project axially oppositely to the inner plate, the outer projection being disposed at a position circumferentially at least partially overlapping the inner projection, and the inner projection. And an elastic body made of a rubber-like elastic material arranged between the outer side convex portion and the outer side convex portion.

According to the present invention, the width of the gear damper in the radial direction can be reduced, and it is possible to provide a gear damper that can meet the demand for space saving of equipment.

The partially cutaway perspective view showing the gear damper of the first embodiment. It is sectional drawing which cut|disconnected the same gear damper in the direction parallel to a central axis line, and is CC sectional view taken on the line in FIG. Sectional view of the same gear damper cut in the direction perpendicular to the axis 3A and 3B are views showing a method for manufacturing the same gear damper, FIG. 1A is a perspective view showing a state where an inner sleeve and an outer sleeve are combined, and FIG. 3B is a perspective view showing a state where an inner sleeve, an outer sleeve and an elastic body are combined. Sectional drawing which shows the other example of the mounting state of the same gear damper. The perspective view which shows the gear damper of 2nd Embodiment. Exploded perspective view of the gear damper

First embodiment...
As shown in FIGS. 1 to 3, the gear damper 1 includes an inner sleeve 11 fixed to the outer peripheral side of an inner peripheral side rotation member 51 (FIG. 2) such as a shaft, a gear main body, a housing holding the gear main body, and the like. The outer sleeve 21 fixed to the inner peripheral side of the outer peripheral side rotation member 61 (FIG. 2) is connected via an elastic body 31 made of a rubber-like elastic material. The inner peripheral side rotating member 51 and the outer peripheral side rotating member 61 are arranged coaxially and relatively rotatable with each other. When the outer peripheral side rotating member 61 is a gear body, gear teeth (not shown) with a predetermined pitch may be provided on the outer peripheral surface of the outer peripheral side rotating member 61.

The inner sleeve 11 is formed of a rigid material such as metal in an annular shape, and has a cylindrical inner sleeve body 12 fitted and fixed to the outer peripheral surface of the inner peripheral rotation member 51, and one of the inner sleeve body 12 in the axial direction ( The inner plate 13 is integrally provided with an outward flange-shaped inner plate 13 that is provided radially outward from the end portion (left side in FIG. 2). Therefore, the inner plate 13 is fixed to the outer peripheral surface of the inner peripheral rotating member 51 via the inner sleeve main body 12, is held by the inner peripheral rotating member 51, and rotates together with the inner peripheral rotating member 51.

The outer sleeve 21 is also made of a rigid material such as metal in an annular shape, and is a tubular outer sleeve main body 22 fitted and fixed to the inner peripheral surface of the outer peripheral side rotation member 61 having an annular shape, and the outer sleeve main body 22. Is integrally provided with an inward flange-shaped outer plate 23 provided radially inward from an end portion on the axially opposite side (right side in FIG. 2 ). Therefore, the outer plate 23 is fixed to the inner peripheral surface of the outer peripheral side rotating member 61 via the outer sleeve main body 22, is held by the outer peripheral side rotating member 61, and rotates together with the outer peripheral side rotating member 61.

The outer diameter of the inner plate 13 is larger than the inner diameter of the outer plate 23 and smaller than the inner diameter of the outer peripheral side rotation member 61. The outer plate 23 has an inner diameter smaller than the outer diameter of the inner plate 13 and larger than the outer diameter of the inner peripheral side rotation member 51.

The inner plate 13 and the outer plate 23 are arranged so as to face each other in the axial direction with a predetermined axial distance c ₁ therebetween. The outer sleeve main body 22 is integrally provided from the outer peripheral end of the outer plate 23 toward one side in the axial direction. The inner sleeve body 12 is integrally provided from the inner peripheral end of the inner plate 13 toward the opposite side in the axial direction. The outer sleeve 21 is arranged on one axial side of the inner sleeve 11. The inner sleeve 11 is arranged on the axially opposite side of the outer sleeve 21. Therefore, the inner sleeve body 12 and the outer sleeve body 22 are arranged at positions axially displaced from each other, and the inner sleeve 11 and the outer sleeve 21 are also disposed axially displaced from each other as a whole.

An annular elastic body 31 made of a rubber-like elastic material is interposed between the inner plate 13 and the outer plate 23, and is bonded (vulcanized) to both the plates 13 and 23. Therefore, the elastic body 31 is arranged between the inner sleeve 11 and the outer sleeve 21, so that the inner sleeve 11, the elastic body 31 and the outer sleeve 21 are arranged such that these three components are arranged in the axial direction.

The inner plate 13 is integrally provided with the inner side convex portion 14 toward one side in the axial direction, that is, toward the outer plate 23. The inner-side convex portion 14 has a plurality of convex portions arranged at equal intervals in the circumferential direction (4 equally distributed in the drawing), and each is embedded in the thickness of the elastic body 31. When the inner side convex portion 14 is formed by pressing a metal plate, the inner side convex portion 14 is provided as a protrusion having a hollow portion 15, and the hollow portion 15 is opened toward the opposite side in the axial direction.

The outer plate 23 is integrally provided with an outer protrusion 24 toward the axially opposite side, that is, toward the inner plate 13. This outer side convex portion 24 is also provided with a plurality of convex portions at equal intervals in the circumferential direction (equal distribution in the figure), and each is embedded in the thickness of the elastic body 31. When the outer-side convex portion 24 is formed by pressing a metal plate, the outer-side convex portion 24 is provided as a protrusion having a hollow portion 25, and the hollow portion 25 is open toward one side in the axial direction.

The inner side convex portions 14 and the outer side convex portions 24 are arranged at positions displaced from each other by 45 degrees in the circumferential direction, and are alternately arranged in the circumferential direction. Therefore, the inner-side convex portion 14 and the outer-side convex portion 24 have portions that overlap (overlap) with each other in the circumferential direction, and the elastic body 31 disposed between the portions that overlap with each other in the circumferential direction is placed in the circumferential direction. It is possible to compress.

When manufacturing the gear damper 1 having the above structure, as shown in FIG. 4A, the inner sleeve 11 and the outer sleeve 21 are assembled in a fixed position with each other, and then a rubber mold (not shown) is used. As shown in B), the elastic body 31 is molded, and at the same time as the molding, the elastic body 31 is adhesively fixed to the sleeves 11 and 21, and these three constituent elements are integrated. Since the sleeves 11 and 21 are combined with each other at fixed positions in the circumferential direction, the position markers 16 and 26 in the circumferential direction may be attached to the sleeves 11 and 21 in advance.

In the gear damper 1 configured as described above, the inner plate 13 is provided with the inner side convex portion 14 toward one side in the axial direction, and the outer plate 23 is provided with the outer side convex portion 24 toward the opposite side in the axial direction. It is possible to elastically deform the elastic body 31 by compressing the elastic body 31 in the circumferential direction at the portions where the projecting convex portions 14 and 24 overlap each other in the circumferential direction. Therefore, it is possible to reduce the rattling noise generated when the gears are meshed with each other due to the cushioning effect exerted by the compression component of the highly rigid elastic body 31.

In the gear damper 1 having the above-described structure, the inner plate 13 is provided with the inner side convex portion 14 toward one side in the axial direction, and the outer plate 23 is provided with the outer side convex portion 24 toward the opposite side in the axial direction. Each of the convex portions 14 and 24 is provided so as to project not in the radial direction but in the axial direction. Therefore, the heights (heights in the axial direction) of the convex portions 14 and 24 can be set independently of the size of the radial distance c ₂ between the inner peripheral side rotation member 51 and the outer peripheral side rotation member 61, and the installation space can be set. Depending on the situation, the height of the convex portions 14 and 24 can be set to be larger than the radial distance c ₂ between the inner peripheral side rotating member 51 and the outer peripheral side rotating member 61. Therefore, it is possible to reduce the radial width d of the gear damper 1 as compared with a gear damper provided with a convex portion that projects radially outward or radially inward, thereby responding to a request for space saving of equipment. Is possible.

Further, in the gear damper 1 having the above configuration, when the inner peripheral side rotation member 51 behaves toward one side in the axial direction, the elastic body 31 is compressed in the axial direction, so that it is possible to receive a load. Therefore, it is possible to expect a buffering effect on the axial behavior of the inner peripheral side rotation member 51.

In the gear damper 1 having the above structure, the inner plate 13 is integrally provided on the inner sleeve 11 fitted and fixed to the inner peripheral side rotating member 51, and the outer plate 23 is fitted and fixed to the outer peripheral side rotating member 61. Since it is provided integrally with the sleeve 21, only by fitting and fixing the inner sleeve 11 to the inner peripheral rotating member 51 and the outer sleeve 21 to the outer peripheral rotating member 61, the gear damper 1 can be mounted. It is possible to complete the work.

Further, in the gear damper 1 having the above structure, the inner plate 13 is integrally provided on the inner sleeve 11 fitted and fixed to the inner peripheral side rotating member 51, and the outer plate 23 is fitted and fixed to the outer peripheral side rotating member 61. Since the sleeve 21 is integrally provided with the sleeve 21, the fitting and fixing position of the inner sleeve 11 with respect to the inner peripheral side rotating member 51 and the fitting and fixing position of the outer sleeve 23 with respect to the outer peripheral side rotating member 61 can be shifted in the axial direction during mounting work. With this, it is possible to arbitrarily increase or decrease the size of the axial distance c ₁ between the inner plate 13 and the outer plate 23. Therefore, by setting the axial distance c ₁ between the inner plate 13 and the outer plate 23 to be smaller than the distance c ₃ at the time of molding the elastic body 31 (FIG. 4A), the elastic body 31 is pre-compressed in the axial direction. For example, the torsional rigidity of the elastic body 31 can be adjusted.

Further, in the gear damper 1 having the above-described configuration, the outer sleeve 21 is arranged on one side in the axial direction of the inner sleeve 11, the inner sleeve 11 is arranged on the opposite side in the axial direction of the outer sleeve 21, and both sleeves 11 and 21 as a whole are axially aligned with each other. Since the sleeves 11 and 21 are arranged at positions displaced in the direction, it is possible to mount the gear damper 1 even when the sleeves 11 and 21 cannot be arranged at the same position in the axial direction depending on the installation space.

The structure of the gear damper 1 having the above-described configuration may be added or changed as follows.

In the gear damper 1 having the above-described structure, the inner plate 13 and the outer plate 23 are each formed in a plane shape perpendicular to the axis, but these plates 13, 23 are formed in a tapered surface shape having an inclination angle other than a right angle with respect to the central axis. May be. Therefore, by changing the size of the inclination angle of the plates 13 and 23, the axial distance c ₁ between the plates 13 and 23 can be changed, and thus the torsional rigidity of the elastic body 31 can be adjusted.

In the gear damper 1 having the above-described configuration, the inner-side convex portion 14 and the outer-side convex portion 24 are formed in four equal distributions, but the number of the convex portions 14 and 24 formed and the circumferential arrangement are not particularly limited. .. It is possible to adjust the torsional rigidity of the elastic body 31 by appropriately designing the number and size of the convex portions 14 and 24, the mutual phase angle, and the like.

In the gear damper 1 configured as described above, the elastic body 31 is adhesively fixed to each of the inner plate 13 and the outer plate 23. A non-bonded assembly structure may be used as long as it is compressed in the direction and can rotate simultaneously.

In the gear damper 1 having the above-described structure, the inner sleeve 11 is fitted and fixed to the outer peripheral surface of the inner peripheral side rotating member 51 as shown in FIG. 2, but the inner peripheral side rotating member 51 has its end surface as shown in FIG. When the inner sleeve 11 is provided with a hollow portion (center shaft hole) 52 that is open to the inside, the inner sleeve 11 is fitted and fixed to the inner peripheral surface of the inner peripheral rotating member 51 at the end surface position of the inner peripheral rotating member 51. May be. In this case, the radial distance c ₂ between the inner peripheral side rotating member 51 and the outer peripheral side rotating member 61 may be set to be extremely small, but the gear damper 1 can be mounted even in such a situation. It is said that

In the gear damper 1 having the above-described configuration, the inner side convex portion 14 and the outer side convex portion 24 are formed as protrusions having the hollow portions 15 and 25, respectively, and these convex portions 14 and 24 are formed by combining inclined surfaces. It may be formed as a protrusion having a V-shaped or wavy cross-sectional shape in the circumferential direction.

Second embodiment...
In this regard, in the example of FIGS. 6 and 7 shown as the second embodiment, the inner side convex portion 14 provided on the inner plate 13 has the outer plate 23 directed toward one side in the circumferential direction (direction of arrow S in the figure). The inclined surface 14a that gradually inclines toward one side, and the inclined surface 14b that is continuously provided on one side in the circumferential direction of the inclined surface 14a and that gradually inclines toward one side in the circumferential direction so as to gradually separate from the outer plate 23. Is formed as a projection having a V-shaped cross section in the circumferential direction. The V-shaped inner side convex portion 14 is provided with a plurality of convex portions arranged at equal intervals in the circumferential direction (4 in the figure).

Further, the outer side convex portion 24 provided on the outer plate 23 is continuous with the inclined surface 24a inclined toward one side in the circumferential direction so as to gradually approach the inner plate 13 and one side in the circumferential direction of the inclined surface 24a. Is formed as a protrusion having a V-shaped cross section in the circumferential direction, which is formed by a combination with an inclined surface 24b that is inclined toward one side in the circumferential direction and is gradually away from the inner plate 13. The V-shaped outer side convex portion 24 is provided with a plurality of convex portions arranged at equal intervals in the circumferential direction (4 equally arranged in the drawing).

The inner convex portion 14 and the outer convex portion 24 thus formed in the V shape are arranged at positions displaced from each other in the circumferential direction, and are alternately arranged in the circumferential direction, and are arranged in the circumferential direction. By having the overlapping portion, the elastic body 31 sandwiched by the overlapping portion can be compressed in the circumferential direction.

When the inner-side convex portion 14 and the outer-side convex portion 24 are formed as V-shaped protrusions in this way, the V-shaped convex portions 14 are previously formed on the protrusion contact surfaces of the elastic body 31. , 24 corresponding to V-shaped recesses, it is possible to contact the inner plate 13 or the outer plate 23 over the entire circumference without bending and deforming the elastic body 31 during assembly. ..

In this case, a V-shaped inner concave portion 32 corresponding to the inner convex portion 14 is formed on the surface of the elastic body 31 that contacts the inner plate 13 (the lower surface in FIG. 7 ). Further, a V-shaped outer side concave portion 33 corresponding to the outer side convex portion 24 is formed on a surface (upper surface in FIG. 7) of the elastic body 31 that contacts the outer plate 23.

The gear damper of the present invention is used, for example, in a transfer device of a vehicle such as an automobile.

DESCRIPTION OF SYMBOLS 1 Gear damper 11 Inner sleeve 12 Inner sleeve body 13 Inner plate 14 Inner side convex part 14a, 14b, 24a, 24b Inclined surface 15, 25, 52 Hollow part 21 Outer sleeve 22 Outer sleeve main body 23 Outer plate 24 Outer side convex part 31 Elastic Body 32 Inner side recessed part 33 Outer side recessed part 51 Inner peripheral side rotating member 61 Outer peripheral side rotating member

Claims (3)

An inner plate fixed to the inner peripheral side rotating member and rotating together with the inner peripheral side rotating member,
An outer plate fixed to an outer peripheral side rotating member arranged on the outer peripheral side of the inner peripheral side rotating member, rotated together with the outer peripheral side rotating member, and arranged so as to face the inner plate in the axial direction,
An inner-side convex portion provided on the inner plate so as to project in one axial direction toward the outer plate,
An outer-side convex portion provided on the outer plate so as to project toward the inner plate toward the opposite side in the axial direction, and an outer-side convex portion arranged at a position that at least partially overlaps the inner-side convex portion on the circumference,
An elastic body made of a rubber-like elastic material disposed between the inner side convex portion and the outer side convex portion,
A gear damper comprising: The gear damper according to claim 1,
The inner side convex portion is composed of a protrusion having a hollow portion,
The gear damper, wherein the outer-side convex portion is formed of a protrusion having a hollow portion. The gear damper according to claim 1,
The inner side convex portion is provided on one side in the circumferential direction and on the one side in the circumferential direction of the inclined surface that is inclined toward the outer plate toward the outer plate, and from the outer plate toward one side in the circumferential direction. With an inclined surface that slopes away,
The outer side convex portion is provided on one side in the circumferential direction of the inclined surface that is inclined toward one side in the circumferential direction toward the inner plate, and on one side in the circumferential direction of the inclined surface, and from the inner plate toward one side in the circumferential direction. A gear damper, comprising: a sloped surface that slopes away from the user.

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