Gear and damper for gear

Abstract

To provide a gear and a damper for a gear that can suppress noise and has excellent versatility.SOLUTION: A gear includes: a gear body 100 made of a metal; and a damper part 150 installed so as to cover at least a meshing surface of each tooth 110 of the gear body 100 and having a surface constituted of an elastomer, thereby suppressing noise and having excellent versatility.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gear and a damper for a gear. [Background technology]

[0002] There is a known technique for providing a damper to suppress noise in various gears (see Patent Document 1). Patent Document 1 discloses a technique for incorporating a damper, which includes an outer ring, an inner ring, and an annular elastic body provided between the outer ring and the inner ring, inside the gear. This technique tends to complicate the gear structure and increase the size of the gear, making it less versatile. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-362346 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a gear and a gear damper that are capable of suppressing noise and have excellent versatility. [Means for solving the problem]

[0005] The present invention employs the following means to solve the above problems.

[0006] That is, the gear of the present invention has the following features: A metal gear body; a damper portion provided so as to cover at least the meshing surfaces of the teeth of the gear body, the damper portion having a surface made of an elastic material; The present invention is characterized by comprising:

[0007] According to the present invention, noise can be suppressed by the damper portion. Since the damper portion is provided so as to cover at least the meshing surfaces of the teeth, the structure of the gear body can be prevented from becoming complicated, and the gear body does not need to be large, compared to a configuration in which a damper is incorporated inside the gear.

[0008] The damper portion may be a rubber layer provided on the surface of the engagement surface.

[0009] If this configuration is adopted, it is only necessary to provide a rubber layer on the surface of the meshing faces of the teeth, and therefore the configuration of the damper portion is simple.

[0010] The damper portion may be a rubber layer formed by applying rubber cement to the engagement surface and then drying the applied rubber cement.

[0011] It is also preferable that the damper portion is a rubber layer formed by applying rubber cement to the meshing surfaces, drying the rubber cement, and vulcanizing the rubber layer by heating.

[0012] The damper portion may be a damper member that is fixedly fitted to the teeth.

[0013] By adopting this configuration, it is only necessary to fit the damper member into the teeth, so the structure of the gear body This can suppress the complexity of the system.

[0014] The damper member may include a thin plate portion formed of a thin metal plate, and rubber layers provided on both sides of the thin plate portion.

[0015] Both side surfaces of the tooth are configured so that the distance between them increases toward the tip surface of the tooth, and a pair of surfaces of the damper member facing both side surfaces of the tooth, respectively, are also configured so that the distance between the two side surfaces increases toward the tip surface of the tooth.

[0016] This makes it possible to prevent the damper member from coming off the teeth even if centrifugal force or the like acts on the damper member.

[0017] The damper members may be separately fitted and fixed to each of the teeth.

[0018] The damper member may have a plurality of fitting portions which are collectively fitted and fixed to a plurality of the teeth, and an expandable portion may be provided between adjacent fitting portions to enable fine adjustment of the distance between them.

[0019] This reduces the number of times the damper member needs to be fitted to the teeth, and the provision of the expandable portion improves the ease of fitting.

[0020] In addition, the gear damper of the present invention has The gear is fixedly fitted onto the teeth of a metal gear body, and is provided so as to cover at least the meshing surfaces of the teeth, with the surface being made of an elastic material.

[0021] The above-mentioned gear damper may include a thin plate portion formed of a thin metal plate, and rubber layers provided on both sides of the thin plate portion.

[0022] The tooth has two side surfaces, the distance between which increases toward the tip surface of the tooth. A pair of surfaces facing each of both side surfaces of the tooth may be configured so that the distance between the two side surfaces increases toward the tip surface of the tooth.

[0023] This makes it possible to prevent the damper member from coming off the teeth even if centrifugal force or the like acts on the damper member.

[0024] The gear dampers may be separately fitted and fixed to each of the teeth.

[0025] The gear damper may have a plurality of fitting portions that are collectively fitted and fixed to a plurality of the teeth, and an expandable portion may be provided between adjacent fitting portions to enable fine adjustment of the distance between them.

[0026] The above configurations may be combined as much as possible. Effect of the Invention

[0027] As described above, according to the present invention, noise can be suppressed and the present invention is highly versatile. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is an external view of a gear according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an external view of a gear according to a second embodiment of the present invention. [Diagram 3] Second Embodiment FIG. 3 is an external view of a gear damper according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing a state of fitting of a gear damper according to a second embodiment of the present invention. [Diagram 5] FIG. 5 is an external view of a gear according to a modified example of the second embodiment of the present invention. [Figure 6] FIG. 6 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. [Figure 7] Third Embodiment FIG. 7 is an external view of a gear damper according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described in the embodiment are not intended to limit the scope of the present invention unless otherwise specified.

[0030] Example 1 A gear according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is an external view of the gear according to the first embodiment of the present invention, in which (a) is a front view of the gear, and (b) is an enlarged view of (a) showing the vicinity of the teeth.

[0031] The gear 10 according to this embodiment is composed of a metallic gear body 100 having a plurality of teeth 110, and a damper section 150. The damper section 150 is provided so as to cover at least the meshing surfaces of the teeth 110 of the gear body 100, and its surface is made of an elastic material. Needless to say, the gear 10 is configured to mesh with the teeth of another gear, and the "meshing surface" means the surface that meshes with the teeth of another gear.

[0032] The tooth 110 has a tip surface 111 and side surfaces 112 on both sides of the tip surface 111. In this embodiment, a configuration is adopted in which a damper portion 150 is provided so as to cover the entire tip surface 111 and the side surfaces 112. However, as described above, it is sufficient that the damper portion 150 is provided so as to cover at least the meshing surfaces.

[0033] The damper section 150 according to this embodiment is made up of a rubber layer provided on the surface of the meshing face. More specifically, the damper section 150 is made up of a first rubber layer 151 covering the tip face 111 of the tooth 110 and a second rubber layer 152 covering both side faces 112 of the tooth 110.

[0034] The damper section 150 can be formed by applying rubber glue to the meshing surfaces of the teeth 110 and then drying the rubber glue. The damper section 150 can also be formed by applying rubber glue to the meshing surfaces of the teeth 110 and then drying the rubber glue and then vulcanizing the rubber glue by heating. The rubber glue can be obtained, for example, by dissolving a material of IIR-type high damping rubber in toluene. The rubber glue is applied to the tip surface 111 and both side surfaces 112 of the teeth 110 to a thickness of about 1 mm or less and then dried, or is dried and then heated to vulcanize the rubber glue. The rubber glue may be applied by spraying or by brushing. It is also preferable to apply an adhesive to the tip surface 111 and both side surfaces 112 of the teeth 110 before applying the rubber glue, so that peeling of the rubber glue can be suppressed. The adhesive can be applied to the tip surface 111 and both side surfaces 112 of the teeth 110 by spraying the adhesive.

[0035] When the rubber cement is dried and then vulcanized by heating, the gear body 100 to which the rubber cement has been applied is placed in an oven at 150° C. to 250° C. for 0.5 to 30 minutes. The baking can be done in time.

[0036] According to the gear 10 configured as above, the mating surface of the teeth 110 is provided with the damper portion 150 made of a rubber layer, so that the shock caused when the teeth come into contact with each other when mating with another gear can be absorbed. This makes it possible to suppress the generation of noise. Also, since the damper portion 150 is configured by simply providing a rubber layer on the surface of the mating surface of the teeth 110, the configuration of the damper portion 150 is simple. According to this configuration, the damper portion can be provided on various gears, so that the present invention is highly versatile. In this embodiment, the case of a so-called spur gear as shown in FIG. 1 is shown, but the present invention can be applied to various gears. That is, it is sufficient to provide the damper portion made of a rubber layer as described above on the surface of the teeth of various gears.

[0037] Example 2 A second embodiment of the present invention is shown in Figures 2 to 4. Figure 2 is an external view of a gear according to the second embodiment of the present invention, and is a front view of the gear. Figure 3 is an external view of a gear damper according to the second embodiment of the present invention, where (a) is a plan view of the gear damper, (b) is a view seen in the direction of the arrow V1 in (a), and (c) is a view seen in the direction of the arrow V2 in (a). Figure 4 is a view showing the fitting of the gear damper according to the second embodiment of the present invention.

[0038] Similar to the first embodiment, the gear 20 according to the present embodiment is made up of a metallic gear body 200 having a plurality of teeth 210, and a damper 250 as a damper section. Similar to the first embodiment, the damper 250 in the present embodiment is provided so as to cover at least the meshing surfaces of the teeth 210 of the gear body 200, and the surface is made of an elastic material.

[0039] The tooth 210 has a tip surface 211 and side surfaces 212 on both sides of the tip surface 211. In this embodiment, a configuration is adopted in which a damper 250 is provided so as to cover the entire tip surface 211 and the side surfaces 212. However, as described above, it is sufficient that the damper 250 is provided so as to cover at least the meshing surfaces.

[0040] The damper 250 according to this embodiment is a damper member that is fitted and fixed to the tooth 210. This damper 250 is composed of a thin plate portion 251 made of a metal thin plate, and rubber layers provided on both sides of the thin plate portion 251. The rubber layer includes a first rubber layer 252 on the front side, and a second rubber layer 253 that contacts the tooth 210. The thin plate portion 251 of the damper 250 includes a first thin plate portion 251a that covers the tip surface 211 of the tooth 210, and a second thin plate portion 251b that covers both side surfaces 212 of the tooth 210.

[0041] The damper 250 configured as above can be obtained by providing rubber layers on both sides of a metal thin plate, and then forming the plate into a desired shape by sheet metal processing. As a method for providing rubber layers on both sides of the thin plate, for example, the method of providing a rubber layer on the surface of the gear body 100 in the first embodiment can be adopted.

[0042] As shown in Fig. 4, the damper 250 configured as above can be fixed by fitting it to the tooth 210. In Fig. 4, the state of the damper 250 before fitting is shown by a dotted line. Then, by fitting the damper 250 to the tooth 210 in the direction of the arrow, the pair of second thin plate portions 251b are deformed so that their tips move away 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, and the damper 250 is fixed to the tooth 210.

[0043] In this embodiment, the damper member as the damper 250 is each of the teeth 210 In other words, the number of damper members as the damper 250 is equal to the number of teeth 210 provided on the gear body 200.

[0044] According to the gear 20 configured as above, the meshing surface of the teeth 210 is provided with a damper member as the damper 250, the surface of which is made of an elastic body (first rubber layer 252), so that when the gear 20 meshes with another gear, the shock caused when the teeth come into contact with each other can be absorbed. This makes it possible to suppress the generation of noise. In addition, since it is only necessary to fit the damper member as the damper 250 to the teeth 210, it is possible to suppress the structure of the gear body from becoming complicated. According to this configuration, since the damper portion can be provided to various gears, it is highly versatile. In this embodiment, the case of a so-called spur gear is shown as shown in FIG. 2, but the present invention can be applied to various gears. That is, it is sufficient to fit the damper member as the damper 250 to the teeth of various gears. As described above, the damper member can be obtained in a desired shape by sheet metal processing, so that it can be easily applied to various gears.

[0045] (Modification of the second embodiment) A modified example of the second embodiment of the present invention is shown in Figures 5 and 6. Figure 5 is an external view of a gear according to the modified example of the second embodiment of the present invention, and a front view of the gear. Figure 6 is a diagram showing the fitting of a gear damper according to the modified example of the second embodiment of the present invention. Since the basic configuration is the same as that of the second embodiment, the same components are given the same reference numerals and their description will be omitted as appropriate.

[0046] As described above, in the gear 20 according to the second embodiment, the second rubber layer 253 is compressed, and the tooth 210 is sandwiched between the pair of second thin plate portions 251b due to the elastic restoring force of the pair of second thin plate portions 251b, thereby fixing the damper 250 to the tooth 210. However, depending on the materials of the various members and the usage environment, the damper 250 may come off the tooth 210 due to the centrifugal force accompanying the rotation of the gear 20, etc.

[0047] Therefore, in this modified example, a configuration capable of preventing the damper from coming off the teeth will be described.

[0048] The gear 20A according to this modification is also composed of a metal gear body 200A having a plurality of teeth 210A, and a damper 250A as a damper portion, as in Example 2. In this modification, as in Example 2, the damper 250A is provided so as to cover at least the meshing surfaces of the teeth 210A of the gear body 200A, and the surface is composed of an elastic body.

[0049] Tooth 210A according to this modification also has tip surface 211 and side surfaces 212 on both sides of tip surface 211. However, in Example 2, as shown in Fig. 4, both side surfaces 212 of tooth 210 are configured so that the distance between both side surfaces becomes narrower toward tip surface 211 of tooth 210, whereas in this modification, both side surfaces 212 of tooth 210A are configured so that the distance between both side surfaces becomes wider toward tip surface 211 of tooth 210A.

[0050] Also in this modified example, a configuration is adopted in which the damper 250A is provided so as to entirely cover the tip surface 211 and the side surface 212. However, as described above, it is sufficient that the damper 250A is provided so as to cover at least the meshing surfaces.

[0051] The damper 250A according to this modification is also composed of a thin plate portion 251 made of a thin metal 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 damper 250A is the same as that of the second embodiment. As explained above.

[0052] As shown in Fig. 6, the damper 250A configured as above can be fixed by fitting it to the tooth 210A, similarly to the second embodiment. In Fig. 6, the state of the damper 250A before fitting is shown by a dotted line. In this modification, a pair of surfaces (corresponding to the inner surfaces of the second rubber layer 253 on the inner side of the second thin plate portion 251b) facing both side surfaces 212 of the tooth 210A in the damper 250A are configured so that the distance between the both side surfaces increases toward the tip surface of the tooth 210A.

[0053] In this modification, damper 250A is fixed to tooth 210A by fitting damper 250A to tooth 210A in the direction of the arrow. Note that in this modification, in order to facilitate the fitting operation of damper 250A, it is desirable to form a large chamfer (such as an R surface with a large radius of curvature) at a portion where tip surface 211 and side surface 212 of tooth 210A are connected.

[0054] The gear 20A configured as above also provides the same effect as in the second embodiment. In this modification, the side surfaces 212 of the tooth 210A are configured such that the distance between the side surfaces increases toward the tip surface 211 of the tooth 210A, and a pair of surfaces of the damper 250A facing the side surfaces 212 of the tooth 210A are also configured such that the distance between the side surfaces increases toward the tip surface of the tooth 210A. As a result, even if a force acts on the damper 250A in a direction to disengage from the tooth 210A, the side surfaces are caught by the side surfaces 212 of the tooth 210A. Therefore, it is possible to prevent the damper 250A from disengaging from the tooth 210A.

[0055] Example 3 FIG. 7 shows a third embodiment of the present invention. In the second embodiment, the damper (damper member) is configured to be fitted and fixed to each tooth separately. In contrast, in this embodiment, the damper has a plurality of fitting portions that are collectively fitted and fixed to a plurality of teeth. The other configurations and functions are the same as those of the second embodiment, so the same components are denoted by the same reference numerals and their explanations are omitted as appropriate.

[0056] 7 is an external view of a gear damper according to a third embodiment of the present invention, and is a front view of the gear damper. A damper 250X according to this embodiment is a damper member that is fitted and fixed to teeth. The teeth and the gear body are the same as those described in the second embodiment, so the description thereof will be omitted.

[0057] The damper 250X, like the second embodiment, is composed of a thin plate portion 251X made of a metal thin plate and rubber layers provided on both sides of the thin plate portion 251X. The rubber layer, like the second embodiment, includes a first rubber layer 252 on the front side and a second rubber layer 253 in contact with the teeth. The thin plate portion 251 of the damper 250X includes a first thin plate portion 251a covering the tip surface of the tooth and a second thin plate portion 251b covering both side surfaces of the tooth.

[0058] The damper 250X as a damper member according to this embodiment has a plurality of fitting parts that are collectively fitted and fixed to a plurality of teeth. That is, as shown in the figure, the damper 250X has a pair of first thin plate parts 251a, and has a pair of second thin plate parts 251b on both sides of each first thin plate part 251a. This allows fitting parts consisting of the first thin plate part 251a and the pair of second thin plate parts 251b on both sides to be fitted to two teeth, respectively. And, in the case of this embodiment, an expansion and contraction part that can finely adjust the distance between the adjacent fitting parts is provided between the fitting parts. In this embodiment, a bellows-shaped part 251c is provided in the thin plate part 251X, and this bellows-shaped part 251c has a function as an expansion and contraction part. That is, the distance between the fitting parts on both sides can be finely adjusted by the expansion and contraction of this bellows-shaped part 251c.

[0059] Even when the damper 250X configured as above is adopted, the same effect as in the second embodiment can be obtained. Moreover, when the damper 250X according to this embodiment is adopted, the number of dampers 250X required for one gear can be reduced compared to the second embodiment. Of course, the number of operations for fitting the damper 250X can also be reduced. And, since the damper 250X has the bellows-shaped portion 251c, even if there is a variation in the distance between adjacent teeth due to dimensional tolerance, the fitting operation is excellent. In this embodiment, the damper 250X having two fitting portions is shown as an example, but a damper having three or more fitting portions can also be adopted. Also, in this embodiment, the configuration shown in the modified example of the second embodiment can also be adopted. [Explanation of symbols]

[0060] 10, 20, 20A: Gears 100, 200, 200A: Gear body 110, 210, 210A: Teeth 111,211: Tip surface 112,212:Side 150: Damper section 151: First rubber layer 152: Second rubber layer 250, 250A, 250X: Damper 251,251X: Thin plate part 251a: First thin plate section 251b: Second thin plate section 251c: Bellows-shaped part 252: First rubber layer 253: Second rubber layer

Claims

1. A metal gear body; a damper portion provided so as to cover at least the meshing surfaces of the teeth of the gear body, the damper portion having a surface made of an elastic material; A gear comprising:

2. 2. The gear according to claim 1, wherein the damper portion is a rubber layer provided on a surface of the meshing surface.

3. 3. The gear according to claim 2, wherein the damper portion is a rubber layer formed by applying rubber cement to the meshing surface and then drying the rubber cement.

4. 3. The gear according to claim 2, wherein the damper portion is a rubber layer formed by applying a rubber cement to the meshing surface, drying the rubber cement, and vulcanizing the rubber layer by heating.

5. 2. The gear according to claim 1, wherein the damper portion is a damper member that is fixedly fitted onto the teeth.

6. 6. The gear according to claim 5, wherein the damper member comprises a thin plate portion made of a thin metal plate and rubber layers provided on both sides of the thin plate portion.

7. 7. The gear according to claim 5 or 6, wherein both side surfaces of the tooth are configured so that the distance between the both side surfaces increases toward the tip surface of the tooth, and a pair of surfaces of the damper member facing both side surfaces of the tooth, respectively, are also configured so that the distance between the both side surfaces increases toward the tip surface of the tooth.

8. 7. The gear according to claim 5, wherein the damper members are fitted and fixed separately to each of the teeth.

9. 7. The gear according to claim 5, wherein the damper member has a plurality of fitting portions which are collectively fitted and fixed to a plurality of the teeth, and an expansion / contraction portion is provided between adjacent fitting portions to enable fine adjustment of the distance between them.

10. A gear damper, which is fitted and fixed to teeth of a metal gear body and is provided so as to cover at least the meshing surfaces of the teeth, the surface of which is made of an elastic material.

11. 11. The gear damper according to claim 10, further comprising: a thin plate portion made of a thin metal plate; and rubber layers provided on both sides of the thin plate portion.

12. The tooth has two side surfaces, the distance between which increases toward the tip surface of the tooth.

12. The gear damper according to claim 10, wherein a pair of surfaces facing each of both side surfaces of the tooth are configured such that the distance between the two side surfaces increases toward the tip surface of the tooth.

13. 12. The gear damper according to claim 10 or 11, wherein the damper is fitted and fixed separately to each of the teeth.

14. A gear damper as described in claim 10 or 11, characterized in that it has a plurality of fitting portions that are fitted and fixed to a plurality of the teeth collectively, and an expansion and contraction portion is provided between adjacent fitting portions to finely adjust the distance between them.

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