Gear and shock absorber for gear

Abstract

The invention provides a gear capable of suppressing noise and having excellent versatility and a shock absorber for the gear. The gear is provided with a metal gear main body (100) and a vibration damping part (150) which is arranged in a manner of covering at least the meshing surface of each tooth (110) in the gear main body (100), and the surface of the vibration damping part (150) is made of an elastic body, so that the gear which can suppress noise and is excellent in universality can be provided.

Description

Technical Field

[0001] The invention relates to a gear and a vibration damper for the gear. Background Art

[0002] In various gears, there is a known technique of providing a vibration damper for suppressing noise (see Patent Document 1). Patent Document 1 discloses a technique of assembling a vibration damper having an outer ring, an inner ring, and an annular elastic body provided between the outer ring and the inner ring inside a gear. In the case of this technique, there is a tendency that the structure of the gear becomes complicated and the gear also becomes larger, so it lacks versatility.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 4-362346 Summary of the invention

[0006] Problems to be solved by the invention

[0007] The present invention provides a gear and a vibration damper for the gear which can suppress noise and have excellent versatility.

[0008] Means for solving problems

[0009] The present invention adopts the following means to solve the above-mentioned problems.

[0010] That is, the gear of the present invention is characterized by comprising:

[0011] a gear body made of metal; and

[0012] The vibration-damping part is provided to cover at least the meshing surface of each tooth of the gear body, and the surface is made of an elastic body.

[0013] According to the present invention, noise can be suppressed by the vibration damping part. Moreover, since the vibration damping part is provided in a manner covering at least the meshing surface of the tooth, the complexity of the structure of the gear body can be suppressed compared with a structure in which a vibration damper is assembled inside the gear, and it does not need to be enlarged.

[0014] The vibration damping portion may be a rubber layer provided on a surface of the engagement surface.

[0015] According to this configuration, since the rubber layer only needs to be provided on the surface of the meshing surface of the teeth, the structure of the vibration damping portion is simple.

[0016] The vibration damping portion may be the rubber layer formed by applying rubber paste to the meshing surface and then drying the rubber paste.

[0017] It is also preferable that the vibration damping portion is the rubber layer formed by applying a rubber paste to the meshing surface, drying the paste, and vulcanizing the paste by heating.

[0018] The vibration-damping portion may be a vibration-damping member fitted and fixed to the teeth.

[0019] According to this configuration, it is only necessary to fit the vibration-damping member with the teeth, so that it is possible to suppress complication of the structure of the gear body.

[0020] The vibration damping member may include a thin plate portion formed of a metal thin plate and rubber layers provided on both surfaces of the thin plate portion.

[0021] Preferably, the two side surfaces of the tooth are constructed such that the distance between the two side surfaces increases toward the front end surface of the tooth; and a pair of surfaces in the vibration damping component respectively opposite to the two side surfaces of the tooth are also constructed such that the distance between the two side surfaces increases toward the front end surface of the tooth.

[0022] Thus, even if centrifugal force or the like acts on the vibration-damping member, it is possible to suppress the vibration-damping member from falling off the teeth.

[0023] The vibration-damping members may be respectively fitted and fixed to the teeth.

[0024] Preferably, the vibration damping member includes a plurality of fitting portions that are fitted and fixed to the plurality of teeth collectively, and a telescopic portion that enables fine adjustment of the distance between adjacent fitting portions is provided between the fitting portions.

[0025] This can reduce the number of times the vibration damping member is fitted with the teeth. In addition, since the telescopic portion is provided, the fitting workability can be improved.

[0026] Furthermore, the gear damper of the present invention is characterized in that:

[0027] The gear damper is fitted and fixed to teeth of a metal gear body and is provided so as to cover at least a meshing surface of the teeth, and the surface thereof is made of an elastic body.

[0028] The gear damper may include a thin plate portion formed of a metal thin plate and rubber layers provided on both surfaces of the thin plate portion.

[0029] The side surfaces of the tooth are configured such that the distance between the side surfaces increases toward the front end surface of the tooth.

[0030] A pair of surfaces respectively facing the two side surfaces of the tooth may be configured such that a distance between the two side surfaces increases toward a front end surface of the tooth.

[0031] Thus, even if centrifugal force or the like acts on the vibration-damping member, it is possible to suppress the vibration-damping member from falling off the teeth.

[0032] The gear damper may be fitted and fixed to each of the teeth.

[0033] The gear damper may include a plurality of fitting portions that are fitted and fixed to the plurality of teeth collectively, and a telescopic portion that can finely adjust the distance between adjacent fitting portions may be provided between the fitting portions.

[0034] Furthermore, the above-mentioned structures can be used in combination as much as possible.

[0035] Effects of the Invention

[0036] As described above, according to the present invention, noise can be suppressed and the versatility is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is an appearance diagram of a gear according to Example 1 of the present invention.

[0038] Figure 2 This is an appearance diagram of a gear according to Example 2 of the present invention.

[0039] Figure 3 This is an appearance diagram of a gear damper according to Example 2 of the present invention.

[0040] Figure 4 It is a diagram showing a fitting state of the gear damper according to the second embodiment of the present invention.

[0041] Figure 5 This is an appearance diagram of a gear according to a modified example of Example 2 of the present invention.

[0042] Figure 6 It is a diagram showing a state of fitting of a gear damper according to a modified example of the second embodiment of the present invention.

[0043] Figure 7 This is an appearance diagram of a gear damper according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0044] Hereinafter, the mode for implementing the present invention will be described in detail based on the embodiments with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention to them unless otherwise specified.

[0045] (Example 1)

[0046] Reference Figure 1 , the gear of embodiment 1 of the present invention is described. Figure 1 1 and 2 are external views of a gear according to a first embodiment of the present invention, wherein (a) is a front view of the gear and (b) is an enlarged view of the vicinity of the teeth in (a).

[0047] The gear 10 of this embodiment is composed of a metal gear body 100 having a plurality of teeth 110 and a damping part 150. The damping part 150 is provided so as to cover at least the meshing surface of each tooth 110 in the gear body 100, and the surface is composed of an elastic body. In addition, of course, the gear 10 is configured to mesh with the teeth of other gears, and the "meshing surface" refers to the surface that meshes with the teeth of other gears.

[0048] The tooth 110 has a front end face 111 and side faces 112 on both sides of the front end face 111. In this embodiment, the damping portion 150 is provided to cover the entire front end face 111 and the side faces 112. However, as described above, the damping portion 150 may be provided to cover at least the meshing surface.

[0049] The vibration damper 150 of this embodiment is composed of a rubber layer provided on the surface of the meshing surface, more specifically, a first rubber layer 151 covering the front end surface 111 of the tooth 110 and a second rubber layer 152 covering the side surfaces 112 on both sides of the tooth 110 .

[0050] The vibration damping portion 150 can be formed by applying rubber paste to the meshing surface of the tooth 110 and then drying it. In addition, the vibration damping portion 150 can also be formed by applying rubber paste to the meshing surface of the tooth 110 and then drying it, and then vulcanizing it by heating. The rubber paste can be obtained, for example, by dissolving a cloth of IIR-based high-attenuation rubber using toluene. The rubber paste is applied to the front end face 111 and the side faces 112 on both sides of the tooth 110 with a thickness of less than about 1 mm and then dried or dried and then heated to vulcanize. In addition, the rubber paste can be applied by spraying or by brushing. In addition, preferably, before applying the rubber paste, by applying an adhesive to the front end face 111 and the side faces 112 on both sides of the tooth 110, peeling of the rubber paste can be suppressed. In addition, the adhesive can be applied to the front end face 111 and the side faces 112 on both sides of the tooth 110 by spraying.

[0051] When the rubber paste is dried and then heated for vulcanization, the gear body 100 coated with the rubber paste is placed in a furnace at 150° C. to 250° C. for vulcanization. The sintering time may be from 5 minutes to about 30 minutes.

[0052] According to the gear 10 constructed as described above, a vibration-damping portion 150 composed of a rubber layer is provided on the meshing surface of the tooth 110, so that when meshing with other gears, the impact when the teeth come into contact with each other can be absorbed. As a result, the generation of noise can be suppressed. In addition, the vibration-damping portion 150 is formed by only providing a rubber layer on the surface of the meshing surface of the tooth 110, so the structure of the vibration-damping portion 150 is simple. According to this structure, the vibration-damping portion can be provided on various gears, so it has excellent versatility. In addition, in this embodiment, as Figure 1 Although the case of so-called spur gears is shown, the present invention can be applied to various gears. That is, the vibration damping part composed of the rubber layer can be provided on the surface of the teeth of various gears as described above.

[0053] (Example 2)

[0054] Figure 2 to Figure 4 Embodiment 2 of the present invention is shown. Figure 2 It is an appearance diagram of a gear according to Embodiment 2 of the present invention, and is a front view of the gear. Figure 3 1 and 12 are appearance diagrams of a gear vibration damper according to a second embodiment of the present invention, wherein (a) is a top view of the gear vibration damper, (b) is a diagram observed along the direction of arrow V1 in (a), and (c) is a diagram observed along the direction of arrow V2 in (a). Figure 4 It is a diagram showing a fitting state of the gear damper according to the second embodiment of the present invention.

[0055] The gear 20 of this embodiment is composed of a metal gear body 200 having a plurality of teeth 210 and a vibration damper 250 as a vibration damping part, similarly to the first embodiment. In this embodiment, similarly to the first embodiment, the vibration damper 250 is provided so as to cover at least the meshing surface of each tooth 210 of the gear body 200, and the surface is composed of an elastic body.

[0056] The tooth 210 has a front end face 211 and side faces 212 on both sides of the front end face 211. In this embodiment, the damper 250 is provided so as to cover the entire front end face 211 and the side faces 212. However, as described above, the damper 250 may be provided so as to cover at least the meshing surface.

[0057] The damper 250 of this embodiment is a damping component that is fitted and fixed to the tooth 210. The damper 250 includes a thin plate portion 251 formed of a metal thin plate and rubber layers provided on both surfaces of the thin plate portion 251. The rubber layer includes a first rubber layer 252 on the surface side and a second rubber layer 253 in contact with the tooth 210. In addition, the thin plate portion 251 of the damper 250 includes a first thin plate portion 251a covering the front end surface 211 of the tooth 210 and a second thin plate portion 251b covering the side surfaces 212 on both sides of the tooth 210.

[0058] The damper 250 constructed as above can be obtained by providing rubber layers on both sides of a metal thin plate and then forming it into a desired shape by sheet metal processing. In addition, as a method of providing rubber layers on both sides of the thin plate, for example, in Example 1, a method of providing rubber layers on the surface of the gear body 100 can be adopted.

[0059] like Figure 4 As shown, the damper 250 constructed as described above can be fixed by fitting it into the teeth 210. Figure 4 In FIG. 1 , the state of the damper 250 before fitting is indicated by a dotted line. Then, by fitting the damper 250 and the tooth 210 in the direction of the arrow, the pair of second thin plate portions 251b are deformed so that their front ends are separated from each other, and the damper 250 is fixed to the tooth 210. That is, the second rubber layer 253 is compressed, and the tooth 210 is sandwiched between the pair of second thin plate portions 251b by the elastic restoring force of the pair of second thin plate portions 251b, so that the damper 250 is fixed to the tooth 210.

[0060] In addition, in this embodiment, the vibration-damping members as the vibration dampers 250 are respectively fitted and fixed to the respective teeth 210. That is, the vibration-damping members as the vibration dampers 250 corresponding to the number of teeth 210 provided in the gear body 200 are required.

[0061] According to the gear 20 constructed as described above, a vibration-damping component as a vibration damper 250 whose surface is made of an elastomer (first rubber layer 252) is provided on the meshing surface of the tooth 210, so that when meshing with other gears, it is possible to absorb the impact when the teeth come into contact with each other. Thus, the generation of noise can be suppressed. In addition, it is sufficient to only fit the vibration-damping component as the vibration damper 250 into the tooth 210, so that the complexity of the structure of the gear body can be suppressed. According to this structure, the vibration-damping part can be provided on various gears, so it has excellent versatility. In addition, in this embodiment, as Figure 2 Although the so-called spur gear is shown, the present invention can be applied to various gears. That is, the vibration-damping component of the vibration damper 250 can be engaged with the teeth of various gears. As described above, the vibration-damping component can be obtained into a desired shape by sheet metal processing, so it can be easily applied to various gears.

[0062] (Variation of Example 2)

[0063] Figure 5 and Figure 6 A modification of the second embodiment of the present invention is shown. Figure 5 This is an appearance diagram of a gear according to a modified example of the second embodiment of the present invention, and is a front view of the gear. Figure 6This is a diagram showing a state of fitting of a gear damper according to a modification of Embodiment 2 of the present invention. The basic structure is the same as that of Embodiment 2, and therefore the same reference numerals are given to the same components, and their description is omitted as appropriate.

[0064] As described above, in the gear 20 of the second embodiment, the second rubber layer 253 is compressed, and the tooth 210 is clamped by the pair of second thin plate portions 251b due to the elastic restoring force of the pair of second thin plate portions 251b, so that the damper 250 is fixed to the tooth 210. However, depending on the materials of various components and the use environment, the damper 250 may also fall off from the tooth 210 due to the centrifugal force caused by the rotation of the gear 20.

[0065] Therefore, in this modification, a structure that can suppress the damper from falling off from the teeth will be described.

[0066] In the gear 20A of this modification, it is also composed of a metal gear body 200A having a plurality of teeth 210A and a damper 250A as a damping part, similarly to Example 2. In this modification, similarly to Example 2, the damper 250A is provided so as to cover at least the meshing surface of each tooth 210A in the gear body 200A, and the surface is composed of an elastic body.

[0067] The tooth 210A of this modified example also has a front end face 211 and side faces 212 on both sides of the front end face 211. However, in the second embodiment, Figure 4 As shown, the side surfaces 212 of the tooth 210 are configured such that the distance between the side surfaces becomes narrower as they approach the front end surface 211 of the tooth 210. In contrast, in this variation, the side surfaces 212 of the tooth 210A are configured such that the distance between the side surfaces becomes larger as they approach the front end surface 211 of the tooth 210A.

[0068] In this modification, the damper 250A is also provided to cover the entire front end surface 211 and the side surface 212. However, as described above, the damper 250A only needs to be provided to cover at least the meshing surface.

[0069] The shock absorber 250A of this modification also includes a thin plate portion 251 made of a metal thin plate and rubber layers (a first rubber layer 252 and a second rubber layer 253) provided on both sides of the thin plate portion 251, similarly to the second embodiment. The thin plate portion 251 includes a first thin plate portion 251a and a second thin plate portion 251b. The manufacturing method of the shock absorber 250A is as described in the second embodiment.

[0070] like Figure 6 As shown, similarly to the second embodiment, the damper 250A constructed as described above can be fixed by fitting with the teeth 210A. Figure 6In the present modification, the pair of surfaces (corresponding to the inner surface of the second rubber layer 253 on the inner side of the second thin plate portion 251b) of the shock absorber 250A that are respectively opposite to the two side surfaces 212 of the tooth 210A are configured so that the distance between the two side surfaces increases as it goes toward the front end surface of the tooth 210A.

[0071] In this modification, the damper 250A is also fitted into the tooth 210A in the direction of the arrow, thereby fixing the damper 250A to the tooth 210A. In addition, in this modification, in order to facilitate the fitting operation of the damper 250A, it is preferred to form a larger chamfer (R surface with a larger curvature radius, etc.) at the portion where the front end surface 211 of the tooth 210A and the side surface 212 are connected.

[0072] The gear 20A constructed as described above can also obtain the same effects as those of the second embodiment. In addition, in the case of this modified example, the side surfaces 212 of the tooth 210A are configured so that the distance between the side surfaces increases as they approach the front end surface 211 of the tooth 210A, and the pair of surfaces in the damper 250A that are respectively opposed to the side surfaces 212 of the tooth 210A are also configured so that the distance between the side surfaces increases as they approach the front end surface of the tooth 210A. Thus, even if a force is applied to the damper 250A in a direction in which it is separated from the tooth 210A, the side surfaces are hooked on the side surfaces 212 of the tooth 210A. Therefore, it is possible to suppress the damper 250A from being separated from the tooth 210A.

[0073] (Example 3)

[0074] Figure 7 The third embodiment of the present invention is shown. In the above-mentioned second embodiment, the vibration damper (vibration damping component) is configured to be respectively fitted and fixed to each tooth. In contrast, in this embodiment, the vibration damper has a structure in which a plurality of fitting parts are fitted and fixed to a plurality of teeth at a time. The other structures and functions are the same as those in the second embodiment, so the same reference numerals are marked on the same structural parts, and their descriptions are appropriately omitted.

[0075] Figure 7 This is an appearance diagram of a gear vibration damper according to Embodiment 3 of the present invention, and is a front view of the gear vibration damper. The vibration damper 250X of this embodiment is a vibration damping component that is fitted and fixed to the gear. The gear and the gear body are as described in Embodiment 2, so their description is omitted.

[0076] The shock absorber 250X includes a thin plate portion 251X made of a metal thin plate and rubber layers provided on both surfaces of the thin plate portion 251X, similarly to the second embodiment. The rubber layer includes a first rubber layer 252 on the surface side and a second rubber layer 253 in contact with the teeth, similarly to the second embodiment. Furthermore, the thin plate portion 251 of the shock absorber 250X includes a first thin plate portion 251a covering the front end surface of the teeth and a second thin plate portion 251b covering the side surfaces on both sides of the teeth.

[0077] The shock absorber 250X as the vibration-damping component of the present embodiment has a plurality of interlocking parts that are interlocked and fixed to a plurality of teeth. That is, as shown in the figure, the shock absorber 250X has a pair of first thin plate parts 251a, and a pair of second thin plate parts 251b are respectively provided on both sides of each first thin plate part 251a. Thus, the interlocking parts consisting of the first thin plate part 251a and a pair of second thin plate parts 251b on both sides thereof can be respectively interlocked in two teeth. And, in the case of the present embodiment, a telescopic part capable of fine-tuning the distance between each other is provided between adjacent interlocking parts. In the present embodiment, a corrugated part 251c is provided on the thin plate part 251X, and the corrugated part 251c has the function of a telescopic part. That is, by the telescopic movement of the corrugated part 251c, the distance between the interlocking parts on both sides thereof can be fine-tuned.

[0078] When the shock absorber 250X constructed as above is adopted, the same effect as that of Example 2 can be obtained. In addition, when the shock absorber 250X of this embodiment is adopted, the number of shock absorbers 250X required for one gear can be reduced compared with Example 2. Of course, the number of operations of fitting the shock absorber 250X can also be reduced. In addition, the shock absorber 250X has a corrugated portion 251c, so even if there is a deviation caused by dimensional tolerance in the distance between adjacent teeth, the fitting workability is excellent. In addition, in this embodiment, a shock absorber 250X having two fitting portions is shown as an example, but a shock absorber having three or more fitting portions can also be used. In addition, in this embodiment, the structure shown in the modified example of Example 2 can also be adopted.

[0079] Description of reference numerals:

[0080] 10, 20, 20A: Gear

[0081] 100, 200, 200A: Gear body

[0082] 110, 210, 210A: Tooth

[0083] 111, 211: front end

[0084] 112, 212: Side

[0085] 150: Vibration reduction unit

[0086] 151: First rubber layer

[0087] 152: Second rubber layer

[0088] 250, 250A, 250X: shock absorber

[0089] 251, 251X: Thin plate

[0090] 251a: First thin plate portion

[0091] 251b: Second thin plate portion

[0092] 251c: Corrugated shape part

[0093] 252: First rubber layer

[0094] 253: Second rubber layer

Claims

1. A gear, characterized in that: include: A gear body made of metal; and The vibration-damping part is provided to cover at least the meshing surface of each tooth of the gear body, and the surface is made of an elastic body.

2. The gear according to claim 1, characterized in that: The vibration damping portion is a rubber layer provided on the surface of the meshing surface.

3. The gear according to claim 2, characterized in that: The vibration damping portion is the rubber layer formed by applying rubber paste to the meshing surface and then drying it.

4. The gear according to claim 2, characterized in that: The vibration damping portion is the rubber layer formed by applying a rubber paste to the meshing surface, drying the paste, and vulcanizing the paste by heating.

5. The gear according to claim 1, characterized in that: The vibration damping portion is a vibration damping member that is fitted and fixed to the teeth.

6. The gear according to claim 5, characterized in that The vibration damping member includes a thin plate portion formed of a metal thin plate and rubber layers provided on both surfaces of the thin plate portion.

7. The gear according to claim 5 or 6, characterized in that: The two side surfaces of the tooth are configured such that the distance between the two side surfaces increases toward the front end surface of the tooth. A pair of surfaces of the vibration damping member that are opposed to the side surfaces of the tooth are also configured such that a distance between the side surfaces increases toward the front end surface of the tooth.

8. The gear according to claim 5 or 6, characterized in that: The vibration-damping members are respectively fitted and fixed to the teeth.

9. The gear according to claim 5 or 6, characterized in that: The vibration damping member includes a plurality of fitting portions that are fitted and fixed to the plurality of teeth collectively, and a telescopic portion that enables fine adjustment of the distance between the adjacent fitting portions is provided.

10. A vibration damper for a gear, characterized in that: The gear damper is fitted and fixed to teeth of a metal gear body and is provided so as to cover at least a meshing surface of the teeth, and the surface thereof is made of an elastic body.

11. The gear vibration damper according to claim 10, characterized in that: The invention comprises a thin plate portion formed of a metal thin plate and rubber layers provided on both surfaces of the thin plate portion.

12. The gear vibration damper according to claim 10 or 11, characterized in that: The side surfaces of the tooth are configured such that the distance between the side surfaces increases toward the front end surface of the tooth. The pair of surfaces respectively facing the two side surfaces of the tooth is configured such that a distance between the two side surfaces increases toward the front end surface of the tooth.

13. The gear vibration damper according to claim 10 or 11, characterized in that: The gear dampers are respectively fitted and fixed to the respective teeth.

14. The gear vibration damper according to claim 10 or 11, characterized in that: A plurality of fitting parts are fitted and fixed to the plurality of teeth collectively, and a telescopic part capable of finely adjusting the distance between the adjacent fitting parts is provided between the adjacent fitting parts.

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