Bonding device

Abstract

The utility model provides a joint device which can restrain the reduction of durability and restrain the time required to be in a meshing state from becoming long at the same time. A dog clutch (10) is provided with a dog ring (20) and a pair of driven gears (30) that can rotate relative to each other about the same axis (CL), and transmits power by bringing dog teeth (22) provided on the dog ring (20) into engagement with dog teeth (32) provided on the driven gears (30). When viewed in the radial direction centered on the axis line (CL), at least one of the dog teeth (22) and the dog teeth (32), for example, in the dog teeth (22), a connection surface (22s) connecting the top surface (22t) and the engagement surface (22k) thereof, is an arc, and a connection site (P1a) between the connection surface (22s) and the engagement surface (22k) is a corner.

Description

TECHNICAL FIELD

[0001] The utility model relates to the engagement device that transmits power by making the first toothed wheel set in the first rotating member and the second toothed wheel set in the second rotating member become the meshing state. BACKGROUND

[0002] It is known that the engagement device has the first rotating member and the second rotating member that can rotate relative to the same axis as the center, and transmits power by making the first toothed wheel set in the first rotating member and the second toothed wheel set in the second rotating member become the meshing state. For example, the engagement device described in patent document 1 is such an engagement device. In patent document 1, regarding the shape of the first toothed wheel and the second toothed wheel, it is disclosed that the normal direction of the connecting surface connecting the meshing surface and the top surface is changed in stages.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENT

[0005] Patent document 1: Japanese patent application publication No. 2015-96759 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In the engagement device described in patent document 1, in order to improve durability, the connecting surface of the first toothed wheel and the second toothed wheel includes a tapered surface. By providing the tapered surface, the tapered surfaces of the first toothed wheel and the second toothed wheel easily collide with each other. Thereby, it is easy to release the collision force at the time of collision of the first toothed wheel and the second toothed wheel in the non-meshing direction, and therefore, it is possible to reduce the collision force received by the first toothed wheel and the second toothed wheel, and the durability of the engagement device is improved. On the other hand, since the tapered surfaces easily collide with each other, it is difficult to increase the rotational speed difference between the first rotating member and the second rotating member in which the first toothed wheel and the second toothed wheel can mesh. Therefore, the time required to make the engagement device into the meshing state can be long. For example, in the case where the engagement device is used for the transmission of a vehicle, the transmission period can be long.

[0008] The utility model is completed in the above situation as background, and its purpose is to provide the engagement device that can inhibit the decrease of durability while inhibiting the time required to become the meshing state to be long.

[0009] SOLUTION FOR SOLVING THE PROBLEMS

[0010] The utility model discloses a kind of engagement devices, the engagement device has first rotating member and second rotating member capable of relative rotation with the same axis as center, power is transmitted by making the first toothed wheel of the first rotating member and the second toothed wheel of the second rotating member into meshing state, wherein, when observing in radial direction with the axis as center, in at least one of the first toothed wheel and the second toothed wheel, the connecting surface of top surface and engagement surface is circular arc and the connecting position of the connecting surface and the engagement surface is corner.

[0011] Effect of the utility model

[0012] According to the engagement device of the utility model, when observing in radial direction with the axis as center, in at least one of the first toothed wheel and the second toothed wheel, the connecting surface of top surface and engagement surface is circular arc and the connecting position of the connecting surface and the engagement surface is corner. By such structure, when the first toothed wheel and the second toothed wheel collide, the collision force (for example, stress concentration) at the collision point of at least one of the first toothed wheel and the second toothed wheel with the connecting surface as circular arc can be reduced, and the durability of the engagement device is improved. In addition, in the case that the connecting position is corner, compared with the case that it is not corner, the shortest distance from top surface (including the extension surface of top surface) to engagement surface in moving direction including meshing direction and non-meshing direction of the first rotating member and the second rotating member can be shortened. Therefore, by making the relative distance of the first toothed wheel and the second toothed wheel in moving direction close to shorter distance, the engagement surfaces of the first toothed wheel and the second toothed wheel will mesh with each other. Therefore, it is easy to increase the rotational speed difference between the first rotating member and the second rotating member in which the first toothed wheel and the second toothed wheel can mesh. Therefore, the engagement device can inhibit the decrease of durability while inhibiting the time required to become meshing state becoming longer. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a diagram illustrating the outline structure of the toothed clutch involved in the utility model.

[0014] Figure 2 It is a diagram illustrating the shape of toothed wheel of the toothed clutch shown in the figure. Figure 1 DETAILED DESCRIPTION

[0015] Hereinafter, referring to the drawings, the embodiment of the utility model is described in detail. In addition, in the embodiment, the size ratio and shape of each part are not necessarily accurately drawn, and the drawings are appropriately simplified or deformed.

[0016]

EMBODIMENT

[0017] Figure 1 ​is a diagram illustrating an outline structure of a dog clutch 10 according to the present application. The dog clutch 10 has a dog ring 20 and a pair of driven gears 30 that are capable of relative rotation with the same axis CL as the center. Hereinafter, a circumferential direction with the axis CL as the center will be simply referred to as "circumferential direction", and a radial direction with the axis CL as the center will be simply referred to as "radial direction". For example, the dog ring 20 and the driven gears 30 are made of a material having high strength [N / m 2 ] such as steel. The "strength" refers to the degree of load that an object can withstand. On the axis CL, the dog ring 20 is disposed between the pair of driven gears 30.

[0018] The dog ring 20 is disc-shaped. On the dog ring 20, dog teeth 22 are provided on each of the faces facing the pair of driven gears 30. The dog teeth 22 are tooth portions protruding in the axis CL direction in the disc-shaped dog ring 20. In the present embodiment, five dog teeth 22 are provided at equal angular intervals in the circumferential direction on each of the two faces of the dog ring 20 facing the pair of driven gears 30. In the dog ring 20, between the adjacent dog teeth 22 are groove bottom faces 24m (refer to FIG. 2) of groove portions 24. Figure 2 ].

[0019] The pair of driven gears 30 are each disc-shaped. On the driven gears 30, dog teeth 32 are provided on each of the faces facing the dog ring 20. The dog teeth 32 are tooth portions protruding in the axis CL direction in the disc-shaped driven gears 30. In the present embodiment, five dog teeth 32 are provided at equal angular intervals in the circumferential direction on each of the two faces of the driven gears 30 facing the dog ring 20 and the faces opposite thereto. The dog teeth 32 are provided in positions corresponding to the dog teeth 22 in a manner capable of engaging with the dog teeth 22. In each of the driven gears 30, between the adjacent dog teeth 32 are groove bottom faces 34m (refer to FIG. 3) of groove portions 34. Figure 2 ].

[0020] The dog ring 20 is capable of moving in the axis CL direction by an actuator such as a shift fork. The moving direction S of the dog ring 20 is the same as the axis CL direction. The dog ring 20 is capable of engaging with either one of the pair of driven gears 30 and also capable of not engaging with either one of the pair of driven gears 30. If the dog ring 20 moves in the moving direction S in a direction in which the dog teeth 22 engage with the driven gears 30, i.e., an engaging direction, the dog teeth 22 and the dog teeth 32 become in an engaged state. If the dog ring 20 moves in the moving direction S in a direction in which the dog teeth 22 do not engage with the driven gears 30, i.e., a non-engaging direction, the dog teeth 22 and the dog teeth 32 become in a non-engaged state. The engaged state means the same as the engaged state or the connected state, and the non-engaged state means the same as the released state or the disconnected state. The moving direction S is a direction including the engaging direction and the non-engaging direction.

[0021] In a case where the cogwheels 22 and 32 are in a non-engagement state, the power transmission from the cogwheel ring 20 to the driven gears 30 is cut off. In a case where the cogwheels 22 and 32 are in an engagement state, the power is transmitted from the cogwheel ring 20 to the driven gears 30. Thus, the cogwheel clutch 10 is an engagement device that transmits the power by bringing the cogwheels 22 and 32 into the engagement state. The cogwheel clutch 10 corresponds to the "engagement device" in the present application, and the cogwheel ring 20 and the pair of driven gears 30 correspond to the "first rotating member" and the "second rotating member", respectively, in the present application. The cogwheels 22 and 32 correspond to the "first cogwheel" and the "second cogwheel", respectively, in the present application.

[0022] Figure 2 is a diagram illustrating the shapes of the cogwheels 22 and 32 of the cogwheel clutch 10 shown in Figure 1 Figure 2 is a cross-sectional view taken along the circumferential direction, i.e., a radial view, in a case where the cogwheels 22 and 32 are in the engagement state. In addition, in Figure 2 , the shape of the cogwheel 22 and the shape of the cogwheel 32 are shown one by one in enlarged views. Furthermore, in Figure 2 the enlarged view illustrating the shape of the cogwheel 22 shown in Figure 2 , the present embodiment is indicated by a solid line, and the comparative example is indicated by a two-dot chain line. Hereinafter, in the description of

[0023] The cogwheel 22 is a face-symmetrical shape, and the symmetry plane thereof is a plane extending in the axial direction CL and the radial direction (any one of five planes equiangularly spaced in the circumferential direction in the present embodiment). The cogwheel 22 has a top surface 22t, a pair of engagement surfaces 22k, and a connection surface 22s. The top surface 22t is a front end surface of the cogwheel 22. The pair of engagement surfaces 22k are two side surfaces of the cogwheel 22 in the circumferential direction. The connection surface 22s is a surface connecting the top surface 22t and the pair of engagement surfaces 22k, respectively. The cogwheel 32 is a face-symmetrical shape, and the symmetry plane thereof is a plane extending in the axial direction CL and the radial direction (any one of five planes equiangularly spaced in the circumferential direction in the present embodiment). The cogwheel 32 has a top surface 32t, a pair of engagement surfaces 32k, and a connection surface 32s. The top surface 32t is a front end surface of the cogwheel 32. The pair of engagement surfaces 32k are two side surfaces of the cogwheel 32 in the circumferential direction. The connection surface 32s is a surface connecting the top surface 32t and the pair of engagement surfaces 32k, respectively.

[0024] ​In the meshing state when the rotation direction of the cog ring 20 and the driven gear 30 is forward rotation, one of the pair of meshing surfaces 22k meshes with one of the pair of meshing surfaces 32k. In the meshing state when the rotation direction of the cog ring 20 and the driven gear 30 is reverse rotation, the other of the pair of meshing surfaces 22k meshes with the other of the pair of meshing surfaces 32k. The meshing surface 22k is a surface through which power is transmitted from the cog ring 20 to the driven gear 30 in the case where the cog teeth 22 and the cog teeth 32 are in the meshing state. The meshing surface 32k is a surface through which power is transmitted from the cog ring 20 to the driven gear 30 in the case where the cog teeth 22 and the cog teeth 32 are in the meshing state.

[0025] As described above, the cog teeth 22 and the cog teeth 32 are each a face-symmetrical shape. In addition, the cog teeth 22 and the cog teeth 32 are the same shape on the connecting surface 22s and the connecting surface 32s. Therefore, hereinafter, as a representative, the shape of the portion on the one side of the pair of meshing surfaces 22k in the cog teeth 22 will be described, and the description of the shape of the other portion will be appropriately omitted.

[0026] The top surface 22t and the meshing surface 22k are each a straight line. The intersection angle of the respective extension planes of the top surface 22t and the meshing surface 22k and the intersection angle of the respective extension planes of the top surface 32t and the meshing surface 32k are each the same intersection angle θ (<1 / 2π) [rad]. The top surface 22t is parallel to the groove bottom surface 34m. The top surface 32t is parallel to the groove bottom surface 24m. For example, the top surface 22t, the groove bottom surface 34m, the top surface 32t, and the groove bottom surface 24m are each a surface perpendicular to the axis CL.

[0027] The connecting surface 22s is, for example, in the shape of a circular arc having a radius of curvature R [m] from the center of curvature Ola. The radius of curvature R is determined through experiments or design so that the durability of the dog clutch 10 is within an allowable range. The greater the radius of curvature R, the more the durability is improved, but the distance Dla described later is more likely to become large. Here, the connecting portion of the connecting surface 22s and the engagement surface 22k is referred to as a connecting portion Pla, and the connecting portion of the connecting surface 22s and the top surface 22t is referred to as a connecting portion Qla. The connecting portion Pla corresponds to the "connecting portion of the connecting surface and the engagement surface" in the present application. Both the connecting portion Pla and the connecting portion Qla are corners. "Being a corner" means that the engagement surface, the top surface, and the connecting surface having the shape of a circular arc are not connected tangentially, and the intersection angle of the tangent line (the tangent line Lla, the tangent line L2a in the case of the dog teeth 22) on the connecting surface side at the connecting portion and the engagement surface, the top surface (the engagement surface 22k, the top surface 22t in the case of the dog teeth 22) is less than π [rad]. In the present embodiment, the central angle φl [rad] of the circular arc of the connecting surface 22s is less than 1 / 2π [rad]. "Being connected tangentially" means that the tangent line on the connecting surface side at the connecting portion and the engagement surface, the top surface are connected in the same direction. "Not being connected tangentially" means that the tangent line on the connecting surface side at the connecting portion and the engagement surface, the top surface are connected so as to intersect. Here, the shortest distance from the top surface 22t (including the extension of the top surface 22t) to the engagement surface 22k in the moving direction S, that is, the distance from the top surface 22t (including the extension of the top surface 22t) to the connecting portion Pla is referred to as the distance Dla [m].

[0028] Figure 2 The comparative example in the enlarged view of the shape of the dog teeth 22 shown is substantially the same shape as the present embodiment, and thus only the different points will be described.

[0029] The connecting surface 26s is in the shape of a circular arc having a radius of curvature R from the center of curvature O2a. Here, the connecting portion of the connecting surface 26s and the engagement surface 22k is referred to as a connecting portion P2a, and the connecting portion of the connecting surface 26s and the top surface 22t is referred to as a connecting portion Q2a. Both the connecting portion P2a and the connecting portion Q2a are not corners. That is, the engagement surface 22k and the top surface 22t are each connected tangentially to the connecting surface 26s having the shape of a circular arc. In the present comparative example, the central angle φ2 [rad] of the circular arc of the connecting surface 26s is greater than 1 / 2π [rad]. Here, the distance from the top surface 22t (including the extension of the top surface 22t) to the connecting portion P2a in the moving direction S is referred to as the distance D2a [m].

[0030] In the present embodiment and the comparative example, the connecting surfaces 22s, 26s are each of the same radius of curvature R, but the distance Dla in the present embodiment is shorter than the distance D2a in the comparative example. This is because the connecting portion P2a and the connecting portion Q2a are each not a corner portion in the comparative example, but the connecting portion Pla and the connecting portion Qla are each a corner portion in the present embodiment.

[0031] The connecting surface 32s is, for example, in the shape of a circular arc having a radius of curvature R [m] from the center of curvature Olb. For example, in the case where the toothed ring 20 and the driven gear 30 are of the same material, it is preferable to make the radius of curvature of the connecting surface 22s and the connecting surface 32s the same as in the present embodiment. Here, the connecting portion of the connecting surface 32s and the meshing surface 32k is referred to as the connecting portion Plb, and the connecting portion of the connecting surface 32s and the top surface 32t is referred to as the connecting portion Qlb. The connecting portion Plb corresponds to the "connecting portion of the connecting surface and the meshing surface" in the present utility model. Here, the distance from the top surface 32t (including the extension of the top surface 32t) to the connecting portion Plb is referred to as the distance Dlb.

[0032] The base end portion of the tooth 32 is shaped so that a gap is created between the connecting surface 22s and the base end portion of the tooth 32 facing it in the case where the tooth 22 and the tooth 32 are in the meshing state. Similarly, the base end portion of the tooth 22 is shaped so that a gap is created between the connecting surface 32s and the base end portion of the tooth 22 facing it in the case where the tooth 22 and the tooth 32 are in the meshing state.

[0033] According to the present embodiment, the dog clutch 10 has the dog ring 20 and the driven gear 30 that are relatively rotatable about the same axis CL, and transmits power by bringing the dog teeth 22 provided to the dog ring 20 and the dog teeth 32 provided to the driven gear 30 into engagement. When viewed in the radial direction, the connecting surface 22s is a circular arc and the connecting points P1a, Q1a are corners, and the connecting surface 32s is a circular arc and the connecting points P1b, Q1b are corners. By making the connecting surfaces 22s, 32s each a circular arc, the connecting surface 22s as a circular arc and the connecting surface 32s as a circular arc come into contact in a state of being externally tangent to each other at the time of collision between the dog teeth 22 and the dog teeth 32. Thus, stress concentration at the collision points of the dog teeth 22 and the dog teeth 32 can be moderated, and the durability of the dog clutch 10 can be improved. In addition, in the case where the connecting points P1a, Q1a are each a corner, the distance D1a can be shortened compared to the case where they are not each a corner. In the case where the connecting points P1b, Q1b are each a corner, the distance D1b can be shortened compared to the case where they are not each a corner. Thus, by merely bringing the relative distances of the dog teeth 22 and the dog teeth 32 in the moving direction S close to the shorter distances D1a, D1b, respectively, the engagement surfaces 22k and 32k come into engagement. Thus, it is easy to increase the rotational speed difference between the dog ring 20 and the driven gear 30 that can be engaged by the dog teeth 22 and the dog teeth 32. That is, even if the rotational speed difference between the dog ring 20 and the driven gear 30 is large, it is easy to bring them into engagement. Thus, the dog clutch 10 can suppress the time required to bring them into engagement from becoming longer while suppressing a decrease in durability. For example, in the case where the dog clutch 10 is used for a transmission of a vehicle, the time during shifting can be suppressed from becoming longer.

[0034] In addition, the above-described content is an embodiment of the present application, and the present application can be implemented in a manner in which various changes and improvements are made based on the knowledge of those skilled in the art without departing from the gist thereof.

[0035] In the above-described embodiment, the way in which the tooth 22 and the tooth 32 are each a face-symmetrical shape and the tooth 22 and the tooth 32 are mutually the same shape in the connecting surface 22s and the connecting surface 32s is adopted, but the present application is not limited to this way. For example, the tooth 22 and the tooth 32 can also not be respectively a face-symmetrical shape. For example, it can be a shape in which the curvature radii of the connecting surface 22s on both sides of the tooth 22 in the circumferential direction are different from each other, or it can be a shape in which one of the connecting surfaces 22s is a circular arc shape and the other is a conical shape when viewed in the radial direction. For example, it can also not be a shape in which the tooth 22 and the tooth 32 are mutually the same shape in the connecting surface 22s and the connecting surface 32s when viewed in the radial direction. For example, it can be a shape in which the curvature radii of the connecting surface 22s and the connecting surface 32s are different from each other, or it can be a shape in which one of the connecting surface 22s and the connecting surface 32s is a circular arc shape and the other is a conical shape. In the tooth 22 and the tooth 32, at a portion where the connecting surface 22s, 32s is a circular arc and the connecting portion Pl a, Plb is a corner when viewed in the radial direction, the dog clutch 10 can suppress a decrease in durability while suppressing an increase in the time required to become the engaged state.

[0036] In the above-described embodiment, the way in which the connecting portions Pl a, Q1a, Plb, Q1b are respectively corners when viewed in the radial direction is adopted, but the present application is not limited to this way. For example, it can also be a way in which at least one of the connecting portions Pl a, Plb is a corner. By this, at least one of the distance D1a and the distance D1b can be shortened. Therefore, in a case where the rotational direction of the dog ring 20 and the driven gear 30 is at least one of forward rotation and reverse rotation, it is easy to increase the rotational speed difference between the dog ring 20 and the driven gear 30 with which the tooth 22 and the tooth 32 can engage. Therefore, the dog clutch 10 can suppress an increase in the time required to become the engaged state.

[0037] In the above-described embodiment, the way in which the dog ring 20 is disposed between the pair of driven gears 30 and can engage either one of the pair of driven gears 30 is adopted, but the present application is not limited to this way. For example, the present application can also be applied to a way in which the dog ring 20 and the driven gear 30 face each other and the tooth 22 and the tooth 32 are respectively provided on the faces of the dog ring 20 and the driven gear 30 that face each other.

[0038] Explanation of Reference Signs

[0039] 10: dog clutch (engaging device), 20: dog ring (first rotary member), 22: dog tooth (first dog tooth), 22k: meshing surface, 22s: connecting surface, 22t: top surface, 30: driven gear (second rotary member), 32: dog tooth (second dog tooth), 32k: meshing surface, 32s: connecting surface, 32t: top surface, CL: axis, Pla: connecting portion (connecting surface and meshing surface connecting portion), Plb: connecting portion (connecting surface and meshing surface connecting portion).

Claims

1. A coupling device comprising a first rotating member and a second rotating member capable of rotating relative to each other about a common axis, wherein power is transmitted by engaging a first tooth disposed on the first rotating member with a second tooth disposed on the second rotating member. Its features are, When viewed radially with the axis as the center, in at least one of the first tooth and the second tooth, the connecting surface that connects the top surface and the meshing surface is an arc and the connection portion of the connecting surface and the meshing surface is a corner.

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