Rotating component and method of forming the same

Abstract

The present application provides a kind of rotating component that can form protrusion into opposite face with simple structure to obtain high sliding torque, and its forming method.Specifically, rotating component (100) is the rotating component with shaft sleeve part (101) and has anti-skid surface (111) on at least one end surface of the axial two end surfaces of the shaft sleeve part, the anti-skid surface has a plurality of concave-convex column parts (120), the concave-convex column part has main groove (125) and at least one auxiliary groove (127) extending in parallel with the main groove, and has convex strip (123) more protruding than the anti-skid surface between the main groove and the auxiliary groove.

Description

Technical Field

[0001] The present invention relates to a rotating component having a bushing portion and having an anti-slip surface on at least one of the two end faces of the bushing portion in the axial direction, and a method thereof for forming the same. Background Technology

[0002] Conventionally, it is known that in a rotating component having a bushing portion and capable of transmitting torque from at least one of the two end faces of the bushing portion along its axial direction, an anti-slip surface with anti-slip processing is provided on the end face.

[0003] For example, it is known that in the case of... Figure 1A and Figure 1B When the rotating component, i.e. the sprocket 500, which has a bushing portion 501 and a plurality of teeth 502 formed along the outer periphery, is fixed to the crankshaft (not shown), torque can be transmitted between the end face of the crankshaft and the end face 503 of the bushing portion 501 by inserting the bushing portion 501 into the end of the crankshaft and tightening it axially with screws or the like.

[0004] It is known that in such a rotating component, an anti-slip surface 511 is formed on the end face 503 that abuts against the opposite end face so that slippage does not occur in the circumferential direction.

[0005] Moreover, as a common method for forming anti-slip surfaces, it is well known that methods such as shot peening are used to give the surface unevenness, thereby increasing the coefficient of friction.

[0006] In addition, it is known that a method is used to form a groove and a protrusion on the end face of the bushing of the sprocket by laser processing, and to make the protrusion actively penetrate into the opposite face by using a fastening force to firmly prevent slippage (see Patent Document 1, etc.).

[0007] Patent documents

[0008] Patent Document 1: US Patent No. 7,472,467 Summary of the Invention

[0009] While roughening a surface by using shot peening or other methods to create uneven surfaces can increase the coefficient of friction, it is not possible to create protrusions that extend deep into the opposite surfaces.

[0010] Although the technology described in Patent Document 1 allows for the creation of protrusions that penetrate deep into the opposite surface through laser processing, the protrusions are formed by molten raw materials rising around the groove. Therefore, the apex of the protrusion is a smooth curve, and many conditions such as hardening caused by laser heat and the raw materials on the opposite surface need to be overcome. Furthermore, high-precision output adjustment is also required.

[0011] Further, there is a problem that since it is difficult to increase the projection amount (height, width), the projection formed by laser processing is small, and it is not possible to increase the friction coefficient to a certain level or more, and it is not possible to cope with a case where a large sliding torque is required. Further, there is a problem that unevenness of the sliding torque becomes large depending on the accuracy such as roughness, flatness of the end surface of the crankshaft to be fastened.

[0012] Further, since when the projections are provided on both surfaces of the bush portion by laser processing, it is difficult to perform laser processing on both surfaces at the same time, but laser processing is performed on each single surface, there is a problem that the process is complicated, and the processing time is long, and the productivity is reduced. Further, the laser processing machine itself is expensive, and there is a problem that the manufacturing cost is increased.

[0013] The present application is an application that solves these problems, and the technical problem to be solved is to provide a rotating member capable of forming a projection that reaches the opposite surface with a simple configuration, and a method for forming the same.

[0014] The rotating member according to the present application is a rotating member having a bush portion and a slip preventing surface on at least one of the end surfaces of the both end surfaces in the axial direction of the bush portion, and the problem is solved by the fact that the slip preventing surface has a plurality of concave-convex column portions, the concave-convex column portion has a main groove and at least one auxiliary groove extending in parallel to the main groove, and a convex strip that is more protruding than the slip preventing surface is obtained between the main groove and the auxiliary groove.

[0015] The method for forming a slip preventing surface of a rotating member according to the present application is a method for forming a rotating member having a bush portion and a slip preventing surface on at least one of the end surfaces of the both end surfaces in the axial direction of the bush portion, and the problem is solved by the fact that a plurality of concave-convex column portions can be formed on the slip preventing surface, and the concave-convex column portion forms a main groove and at least one auxiliary groove extending in parallel to the main groove by forging, and a convex strip that is more protruding than the slip preventing surface is obtained between the main groove and the auxiliary groove.

[0016] According to the anti-skid formation method of the rotating member according to the technical solution 1 and the rotating member according to the technical solution 7, since the concave-convex array is formed on the anti-skid surface by forging, the concave-convex array has a main groove, at least one auxiliary groove extending in parallel with the main groove, and a convex strip protruding more than the anti-skid surface between them, so the degree of freedom of the shape design of the convex strip is higher than that of the convex part formed by laser processing, and the height and width of the convex strip can be increased, thus the convex strip can easily penetrate into the opposite surface only by actively ensuring the shape that the shear stress applied to the convex strip penetrating into the opposite surface is less than the allowable stress of the raw material. Thus, since the strength of the convex strip is improved in dependence on the sliding torque, high sliding torque can be obtained regardless of the accuracy of the roughness and flatness of the opposite surface, so even in the case of requiring a larger sliding torque, it can be fully coped with.

[0017] In addition, since the convex strip penetrates into the opposite surface, the anti-skid effect can be achieved in all directions, so the reduction of the anti-skid effect due to the direction can be suppressed, and the anti-skid can be sufficiently performed in the torque direction as well as in the radial direction.

[0018] Moreover, since the device for forming the concave-convex array by forging can use a general product, and its control is easy, the rotating member can be manufactured with a simple structure and at a low cost.

[0019] According to the configuration of the technical solution 2 and the technical solution 8, since the auxiliary grooves are arranged on both sides of the main groove on the concave-convex array, the arrangement density of the convex strip of the concave-convex array is increased, so the anti-skid effect in the vertical direction thereof becomes extremely high.

[0020] According to the configuration of the technical solution 3 and the technical solution 9, since the side surface of the main groove side and the side surface of the auxiliary groove side of the convex strip are tapered surfaces, the convex strip can be made to actually penetrate into the opposite surface, so the anti-skid effect on the rotating torque can be improved.

[0021] According to the configuration of the technical solution 4 and the technical solution 10, since the angle of the side surface of the main groove side and the side surface of the auxiliary groove side of the convex strip is 30° to 60°, the convex strip can be made to more actually penetrate into the opposite surface, so the anti-skid effect on the rotating torque can be greatly improved.

[0022] According to the configuration of the technical solution 5 and the technical solution 11, since a part or the whole of the plurality of concave-convex arrays is formed to extend in a radial direction on the anti-skid surface, the direction of the concave-convex array can be made to be random as a whole, so the anti-skid effect of the direction of the extension of the concave-convex array can be uniformized, and the rotating member can be sufficiently prevented from wobbling against vibration and axial vibration, so high sliding torque can be obtained as a result.

[0023] According to the configuration of the present technical solution 6 and the present technical solution 12, since a part or the whole of the plurality of concave-convex row portions is formed so as to extend spirally on the slip prevention surface, the balance between the slip prevention effect with respect to the rotational torque and the slip prevention effect with respect to the radial direction can be arbitrarily designed, and thus the reduction in the slip prevention effect due to the direction can be suppressed, and the slip prevention can be sufficiently performed with respect to the torque direction and also with respect to the radial direction. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1A is a reference front view of a rotating member (sprocket) having a slip prevention surface.

[0025] Figure 1B is a reference side view of a rotating member (sprocket) having a slip prevention surface.

[0026] Figure 2 is a front view (part) of a rotating member according to the first embodiment of the present application.

[0027] Figure 3 is an A-A line cross-sectional view of Figure 2

[0028] Figure 4 is a front view (part) of a rotating member according to the second embodiment of the present application.

[0029] SYMBOL EXPLANATION

[0030] 100, 500 - sprocket (rotating member); 101, 501 - boss portion; 102, 502 - tooth; 103, 503 - end surface; 111, 511 - slip prevention surface; 120 - concave-convex row portion; 123 - convex stripe; 123a, 123b - side surface; 125 - main groove; 127 - auxiliary groove. DETAILED DESCRIPTION

[0031] ​As long as the following, the specific configuration can also be arbitrary, namely, the rotating member of the present application is a rotating member having a shaft sleeve portion and a non-slip surface on at least one of the end surfaces of the shaft sleeve portion in the axial direction, characterized in that the non-slip surface has a plurality of concave-convex rows, the concave-convex rows have a main groove and at least one auxiliary groove extending in parallel with the main groove, and a convex strip more protruding than the non-slip surface is provided between the main groove and the auxiliary groove, and the forming method of the rotating member of the present application is a forming method of a rotating member having a shaft sleeve portion and a non-slip surface on at least one of the end surfaces of the shaft sleeve portion in the axial direction, characterized in that a plurality of concave-convex rows can be formed on the non-slip surface, and a main groove and at least one auxiliary groove extending in parallel with the main groove can be formed by forging, the concave-convex rows can have a convex strip more protruding than the non-slip surface between the main groove and the auxiliary groove, and thus a rotating member capable of forming a convex portion reaching the opposite surface with a simple configuration and having high slip torque and a forming method thereof can be provided.

[0032] Example 1

[0033] As Figure 2 shown, the rotating member of the first embodiment of the present application, namely, the sprocket 100 has a plurality of teeth 102 formed along the outer periphery, and is formed so that, when fixed to a crankshaft (not shown), the non-slip surface 111 formed on the end surface 103 of the shaft sleeve portion 101 can be brought into abutment with the crankshaft to transmit torque by inserting the shaft sleeve portion 101 into the end portion of the crankshaft and fastening with a screw or the like in the axial direction.

[0034] The non-slip surface 111 has a plurality of concave-convex rows 120 arranged so as to be regularly separated in a state of extending in a radial direction over the entire surface of the non-slip surface 111.

[0035] As Figure 3 shown, the concave-convex row 120 has a main groove 125 which is a groove having a cross section in the shape of an inverted peak extending in one direction, auxiliary grooves 127, 127 which are grooves having a cross section in the shape of an inverted peak extending in parallel on both sides of the main groove 125, and two convex strips 123, 123 more protruding than the non-slip surface 111 between the adjacent main groove 125 and auxiliary groove 127. The convex strip 123 is a cross-sectional peak having a sharp top end rising from the non-slip surface 111, and has a shape in which the shear stress applied to the convex strip 123 reaching the opposite surface (the end surface of the fastened crankshaft) is below the allowable stress of the raw material.

[0036] The side surface 123a on the main groove 125 side and the side surface 123b on the auxiliary groove 127 side of the protrusions 123 and 123 are conical surfaces. The angle θ between the side surface 123a on the main groove 125 side and the side surface 123b on the auxiliary groove 127 side of the protrusions 123 and 123 is, for example, 30° to 60°.

[0037] The depth d1 of the main groove 125 from the anti-slip surface 111 is, for example, 0.4 to 1.0 mm.

[0038] Furthermore, the depth d2 of the auxiliary groove 127 from the anti-slip surface 111 is, for example, shallower than the depth d1 of the main groove 125 from the anti-slip surface 111, by 0.1 to 0.7 mm.

[0039] In addition, the height t of the raised strip 123 from the anti-slip surface 111 is, for example, 0.1 to 0.8 mm.

[0040] In this embodiment, the raised and recessed section 120 is formed by forging (stamping) to form a main groove 125 and auxiliary grooves 127 extending in parallel on both sides of the main groove 125. Then, by using the burrs formed by the grooves, a raised shape (raised strip 123) that is more prominent than the anti-slip surface 111 is obtained between the main groove 125 and the auxiliary grooves 127.

[0041] The main slot 125 and the auxiliary slot 127 can be engraved simultaneously, or the auxiliary slot 127 can be engraved after the main slot 125 is engraved. Alternatively, the main slot 125 can be engraved after the auxiliary slot 127 is engraved.

[0042] Example 2

[0043] like Figure 4 As shown, in the second embodiment of the present invention, the rotating component, i.e. the sprocket, is regularly formed with a plurality of concave and convex rows 120 in a spiral-extending manner, and the other configurations are the same as those in the first embodiment described above.

[0044] Although the embodiments described above assume the same arrangement over the whole circumference, it is also possible for the following situations to occur: the arrangement density and direction of the concave and convex columns are different in each part; the arrangement is continuous; the forms of each embodiment are mixed; and the concave and convex columns may intersect.

[0045] Furthermore, it is not limited to configuring auxiliary grooves on both sides of the main groove and having two protrusions; the concave-convex row only needs to configure one auxiliary groove on one side of at least one main groove and form one protrusion.

[0046] Further, although the case where the main groove and the auxiliary groove of the concave-convex column portion are formed as grooves in an inverted-peak cross section is illustrated, if the following shape is adopted, the grooves can be formed in an inverted-semi-circle cross section, that is, a shape in which the convex strip formed between the main groove and the auxiliary groove is ensured to be deep into the end surface of the crankshaft.

[0047] As long as the main groove and the auxiliary groove of the desired shape can be engraved, the device for engraving the main groove and the auxiliary groove can be any device.

[0048] Further, although the sprocket is illustrated as a rotating member, as long as it is a rotating member that receives torque from the end surface, it can be any rotating member, and can be used in various industrial fields.

Claims

1. A rotating component having a bushing portion, and having an anti-slip surface on at least one of the two end faces of the bushing portion in the axial direction, characterized in that, The anti-slip surface has multiple rows of concave and convex sections. The raised and recessed portion has a main groove and at least one auxiliary groove extending parallel to the main groove, and a raised ridge that is more prominent than the anti-slip surface is located between the main groove and the auxiliary groove. The raised strip is a mountain-shaped cross-section that is designed for anti-slip purposes, extends deep into the opposite surface of the anti-slip surface, and has a sharp top that rises from the anti-slip surface. The depth (d1) of the main groove from the anti-slip surface is 0.4–1.0 mm. The depth (d2) of the auxiliary groove from the anti-slip surface is shallower than the depth (d1) of the main groove from the anti-slip surface, by 0.1–0.7 mm. Part or all of the plurality of raised and recessed sections are formed to extend radially or spirally on the anti-slip surface. The auxiliary groove is a groove with an inverted mountain peak-shaped cross-section.

2. The rotating component according to claim 1, characterized in that, The concave-convex arrangement has auxiliary grooves on both sides of the main groove.

3. The rotating component according to claim 1 or claim 2, characterized in that, The side surfaces of the main groove side and the auxiliary groove side of the convex strip are conical surfaces.

4. The rotating component according to claim 3, characterized in that, The angle between the side of the main groove of the convex strip and the side of the auxiliary groove of the convex strip is 30° to 60°.

5. A method for forming a rotating component, comprising a method for forming a rotating component having a bushing portion and having an anti-slip surface on at least one of the end faces of the bushing portion in the axial direction, characterized in that, Multiple rows of uneven sections are formed on the anti-slip surface. The raised and recessed sections are formed by forging a main groove and at least one auxiliary groove extending parallel to the main groove, thereby creating a raised ridge that is more prominent than the anti-slip surface between the main groove and the auxiliary groove. The raised strip is a mountain-shaped cross-section that is designed for anti-slip purposes, extends deep into the opposite surface of the anti-slip surface, and has a sharp top that rises from the anti-slip surface. The depth (d1) of the main groove from the anti-slip surface is 0.4–1.0 mm. The depth (d2) of the auxiliary groove from the anti-slip surface is shallower than the depth (d1) of the main groove from the anti-slip surface, by 0.1–0.7 mm. Part or all of the plurality of raised and recessed sections are formed to extend radially or spirally on the anti-slip surface. The auxiliary groove is a groove with an inverted mountain peak-shaped cross-section.

6. The method for forming a rotating component according to claim 5, characterized in that, The convex and concave sections are formed such that the auxiliary grooves are disposed on both sides of the main groove.

7. The method for forming a rotating component according to claim 5 or claim 6, characterized in that, The concave-convex row is formed such that the side surface of the main groove side of the convex strip and the side surface of the auxiliary groove side of the convex strip form a conical surface.

8. The method for forming a rotating component according to claim 7, characterized in that, The concave-convex row is formed such that the angle between the side surface of the main groove side of the convex strip and the side surface of the auxiliary groove side of the convex strip is 30° to 60°.

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