JP2023067407A - Coupling and manufacturing method of coupling - Google Patents

Abstract

To provide a coupling capable of reducing vibration and noise by making axes of two rotors coincident and capable of suppressing durability reduction caused by load reduction of a bearing or the coupling by avoiding strong connection of the coupling, and a manufacturing method of the coupling.SOLUTION: A coupling comprises: a first rotor including a first end face and being rotatable around a first rotation axis; a second rotor including a second end face opposed with the first end face; a first rotation transmission part of the first rotor; a second rotation transmission part which is provided in the second rotor and disposed side by side with the first rotation part in a circumferential direction; and a first joint member which is positioned between both the rotation transmission parts, includes a first side face directed toward the first rotation transmission part, a second side face directed toward the second rotation transmission part and a first protrusion protruding from the first side face to the first rotation transmission part and is capable of forming a clearance between the first protrusion and the first rotation transmission part by compression plastic deformation of the first protrusion in the circumferential direction.SELECTED DRAWING: Figure 2

Description

Embodiments of the present invention relate to couplings and methods of making couplings.

Conventionally, a coupling that connects two rotating bodies is known. For example, a so-called spider is arranged between the teeth of the two shafts. The spider is made of an elastic material such as rubber and can transmit rotation between two shafts (Patent Document 1).

Japanese Utility Model Laid-Open No. 60-081319

However, in the conventional configuration, the two rotors can be coupled together with their rotational axes not aligned. In this case, there is a possibility that vibration and noise may occur due to axial misalignment between the two rotating rotating bodies. On the other hand, even if the axes of rotation are perfectly aligned, if the two rotors are so tightly coupled that they cannot move relative to each other, there is a risk that parts such as bearings that come into contact with the rotors will receive a load. be. The vibration of the rotating body and the load on the parts may reduce the durability of the coupling.

Therefore, the present invention has been made in view of the above. Provided are a coupling capable of suppressing deterioration in durability by reducing the load on a ring, and a method for manufacturing the coupling.

As an example, the coupling according to the embodiment of the present invention includes a first member rotatable around a first rotation axis, and an end of the first member in an axial direction along the first rotation axis. a first rotating body having a first end surface formed by a curved surface; a second member rotatable about a second rotation axis and spaced apart from the first member in the axial direction; a second rotating body having a second end surface facing the first end surface and provided at the end of the second member in the direction along the rotation axis of the rotating body; a first rotation transmission portion positioned between the first end face and the second end face in the axial direction; a second rotation transmission portion positioned between the second end surface and aligned with the first rotation transmission portion in the circumferential direction about the first rotation axis; a first side surface positioned between the first rotation transmission portion and the second rotation transmission portion and facing the first rotation transmission portion in the circumferential direction; a second side surface facing a transmission portion; and a first projection projecting from the first side surface toward the first rotation transmission portion; Rotation around the first rotation axis can be transmitted between the rotation transmitting portion and the first projection and the first rotation transmitting portion by compressive plastic deformation of the first projection in the circumferential direction. and a first joint member capable of forming a gap between. Therefore, as an example, the coupling can arrange the first rotation transmission section, the second rotation transmission section, and the first joint member at desired positions. As a result, the coupling can suppress vibration and noise caused by the deviation between the first rotating shaft and the second rotating shaft. Further, when the first projection undergoes plastic deformation (compressive plastic deformation) so as to be compressed in the circumferential direction, a clearance that becomes play may be formed between the first projection and the first rotation transmitting portion. As a result, the coupling is such that, for example, the parts (for example, bearings that support the respective rotating bodies) that come into contact with the first rotating body and the second rotating body provide a strong connection between the first rotating body and the second rotating body. It is possible to suppress receiving a load due to a loose coupling. As described above, the coupling suppresses the vibration and noise of the first rotating body and the second rotating body, and prevents the load from acting on the parts in contact with the first rotating body and the second rotating body. suppress Therefore, the coupling can suppress deterioration in durability.

FIG. 1 is a cross-sectional view schematically showing the pump device according to the first embodiment. FIG. 2 is a perspective view showing the disassembled coupling of the first embodiment; FIG. FIG. 3 is a side view showing part of the coupling of the first embodiment. 4 is a cross-sectional view schematically showing the coupling of the first embodiment along line F4-F4 of FIG. 3. FIG. FIG. 5 is a side view showing the joint before coupling the drive shaft and driven shaft of the first embodiment. FIG. 6 is a cross-sectional view schematically showing first and second protrusions in the first embodiment. FIG. 7 is a cross-sectional view schematically showing a coupling according to the second embodiment. FIG. 8 is a cross-sectional view schematically showing a coupling according to the third embodiment. FIG. 9 is a cross-sectional view schematically showing a coupling according to the fourth embodiment. FIG. 10 is a cross-sectional view schematically showing a coupling according to the fifth embodiment.

(First embodiment)
A first embodiment will be described below with reference to FIGS. 1 to 6. FIG. Note that, in this specification, the constituent elements according to the embodiment and the description of the relevant elements may be described with a plurality of expressions. The components and their descriptions are examples and are not limited by the expressions herein. Components may also be identified by names different from those herein. Also, components may be described in terms that differ from the terms used herein.

FIG. 1 is a cross-sectional view schematically showing a pump device 10 according to the first embodiment. The pump device 10 is mounted, for example, on a vehicle such as an automobile. The pumping device 10 is capable of pumping hydraulic fluid in a vehicle oilway. It should be noted that the pump device 10 is not limited to this example, and may feed another fluid such as a cooling liquid, or may be mounted on another device.

The pump device 10 has a pump 11 , a motor 12 and a coupling 13 . Note that the coupling 13 is not limited to this example, and may be provided in another device having two rotating bodies capable of transmitting rotation.

The pump 11 has a housing 21 and a rotor 22 . The housing 21 accommodates the rotor 22 . The housing 21 is provided with a flow path 25 connected to an oil path of the vehicle. Rotor 22 is arranged in channel 25 . Rotation of the rotor 22 causes the pump 11 to pump hydraulic oil in the flow path 25 . Note that the pump 11 is not limited to this example.

The motor 12 has a housing 31 , a stator 32 and a rotor 33 . Housing 31 is attached to pump 11 by, for example, a plurality of screws 35 . The stator 32 and rotor 33 are housed inside the housing 31 . The stator 32 is fixed to the housing 31 . The rotor 33 rotates with respect to the housing 31 and the stator 32 by applying current to the stator 32 .

The coupling 13 has a drive shaft 41 , a driven shaft 42 , a joint 43 , multiple first bearings 44 , and multiple second bearings 45 . The drive shaft 41 is an example of a first rotor. The driven shaft 42 is an example of a second rotating body.

The drive shaft 41 and the driven shaft 42 are made of metal such as stainless steel, for example. The drive shaft 41 and driven shaft 42 may be made of other materials. Further, the material of the drive shaft 41 and the material of the driven shaft 42 may be the same or different.

A drive shaft 41 is an output shaft of the motor 12 . A drive shaft 41 is provided in the motor 12 and fixed to the rotor 33 . The drive shaft 41 rotates around the first central axis Ax<b>1 together with the rotor 33 when an electric current is applied to the stator 32 . The first central axis Ax1 is an example of a first rotation axis.

FIG. 2 is a perspective view showing the disassembled coupling 13 of the first embodiment. As shown in FIG. 2, the drive shaft 41 has a shaft 51 and two claws 52 . The shaft 51 is an example of a first member. Note that the first member is not limited to a shaft-shaped member. The claw 52 is an example of a first rotation transmission section. Note that the number of claws 52 is not limited to this example.

As shown in FIG. 1, the shaft 51 is formed in a substantially columnar shape extending along the first central axis Ax1. The first central axis Ax1 is a virtual straight line passing through the center of the shaft 51 . The shaft 51 is rotatable around the first central axis Ax1. Note that the center of rotation of the drive shaft 41 may be different from the center of the shaft 51 .

In this embodiment, axial, radial and circumferential directions are defined for convenience. The axial direction is the direction along the first central axis Ax1. The radial direction is a direction perpendicular to the first central axis Ax1. The circumferential direction is the direction around the first central axis Ax1.

The axial direction includes the first axial direction Da1 and the second axial direction Da2 shown in FIG. The first axial direction Da1 is one direction along the first central axis Ax1. The second axial direction Da2 is opposite to the first axial direction Da1. In this embodiment, the rotor 22 of the pump 11 is separated from the rotor 33 of the motor 12 in the first axial direction Da1.

As shown in FIG. 2, the shaft 51 has an end surface 51a. The end face 51a is an example of a first end face. The end surface 51a is provided at the end of the shaft 51 in the first axial direction Da1. The end surface 51a is formed substantially flat and faces the first axial direction Da1. Note that the shape of the end surface 51a is not limited to this example.

FIG. 3 is a side view showing part of the coupling 13 of the first embodiment. As shown in FIG. 3, the pawl 52 is formed integrally with the shaft 51 and protrudes from the end surface 51a in the first axial direction Da1. That is, the pawl 52 is provided on the shaft 51 . Note that the claw 52 may be a part different from the shaft 51 . The two claws 52 are formed in substantially the same shape and are spaced apart from each other in the circumferential direction. The two claws 52 are arranged substantially evenly with a gap in the circumferential direction.

FIG. 4 is a cross-sectional view schematically showing the coupling 13 of the first embodiment along line F4-F4 in FIG. As shown in FIG. 4, each of the two claws 52 has two side surfaces 52a, 52b. The side surface 52a is formed substantially flat and faces the first circumferential direction Dr1 included in the circumferential direction. The side surface 52b is formed substantially flat and faces the second circumferential direction Dr2 included in the circumferential direction. The second circumferential direction Dr2 is opposite to the first circumferential direction Dr1. The side surface 52b is located on the opposite side of the side surface 52a in the circumferential direction.

For example, the side surface 52a is formed substantially parallel to a virtual plane extending radially through the first central axis Ax1. Also, the side surface 52b is formed substantially parallel to a virtual plane rotated 90° from the above plane around the first central axis Ax1. Note that the side surfaces 52a and 52b are not limited to this example.

As shown in FIG. 3, each of the two claws 52 further has an end face 52c. The end surface 52c is provided at the end of the claw 52 in the first axial direction Da1. The end surface 52c is formed substantially flat and faces the first axial direction Da1.

Driven shaft 42 is the input shaft of pump 11 . A driven shaft 42 is provided in the pump 11 and fixed to the rotor 22 . The driven shaft 42 rotates together with the rotor 22 around the second central axis Ax2. The second central axis Ax2 is an example of a second rotation axis.

As shown in FIG. 2 , the driven shaft 42 has a shaft 61 and two claws 62 . The shaft 61 is an example of a second member. Note that the second member is not limited to a shaft-shaped member. The claw 62 is an example of a second rotation transmission section. Note that the number of claws 62 is not limited to this example.

As shown in FIG. 1, the shaft 61 is formed in a substantially columnar shape extending along the second central axis Ax2. The second central axis Ax2 is a virtual straight line passing through the center of the shaft 61 . The shaft 61 is rotatable around the second central axis Ax2. Note that the center of rotation of the driven shaft 42 may be different from the center of the shaft 61 .

In this embodiment, the first central axis Ax1 and the second central axis Ax2 match each other. That is, the shaft 51 of the drive shaft 41 and the shaft 61 of the driven shaft 42 are arranged concentrically (coaxially). Therefore, the axial direction is also the direction along the second central axis Ax2. Further, the radial direction is also the direction orthogonal to the second central axis Ax2, and the circumferential direction is also the direction around the second central axis Ax2.

As shown in FIG. 3, the shaft 61 of the driven shaft 42 is separated from the shaft 51 of the drive shaft 41 in the first axial direction Da1. Further, the shaft 61 of the driven shaft 42 is separated from the end face 52c of the claw 52 in the first axial direction Da1.

The shaft 61 has an end face 61a. The end face 61a is an example of a second end face. The end face 61a is provided at the end of the shaft 61 in the second axial direction Da2. In other words, the end face 61a is provided at one end of the shaft 61 in the direction along the second central axis Ax2. The end face 61a is formed substantially flat and faces the second axial direction Da2. Note that the shape of the end surface 61a is not limited to this example. The end face 51a of the shaft 51 and the end face 61a of the shaft 61 face each other. The end surface 61 a of the shaft 61 also faces the end surface 52 c of the claw 52 .

The two claws 62 are formed integrally with the shaft 61 and protrude from the end face 61a in the second axial direction Da2. That is, the pawl 62 is provided on the shaft 61 . Note that the claw 62 may be a component different from the shaft 61 .

The two claws 62 are formed in substantially the same shape and are spaced apart from each other in the circumferential direction. The two claws 62 are arranged substantially evenly with a gap in the circumferential direction. Moreover, the claw 62 is formed in substantially the same shape as the claw 52 of the drive shaft 41 . Note that the shape of the claw 52 and the shape of the claw 62 may be different from each other.

As shown in FIG. 4, each of the two claws 62 has two side surfaces 62a, 62b. The side surface 62a is formed substantially flat and faces the first circumferential direction Dr1. The side surface 62b is formed substantially flat and faces the second circumferential direction Dr2. The side surface 62b is located on the opposite side of the side surface 62a in the circumferential direction.

For example, the side surface 62a is formed substantially parallel to a virtual plane extending radially through the second central axis Ax2. Also, the side surface 62b is formed substantially parallel to a virtual plane rotated 90° from the above plane around the second central axis Ax2. Note that the side surfaces 62a and 62b are not limited to this example.

As shown in FIG. 3, each of the two claws 62 further has an end surface 62c. The end surface 62c is provided at the end of the claw 62 in the second axial direction Da2. The end surface 62c is formed substantially flat and faces the second axial direction Da2. The end surface 62 c faces the end surface 51 a of the shaft 51 .

The claws 52 and 62 are positioned between the end surface 51a of the shaft 51 and the end surface 61a of the shaft 61 in the axial direction. Moreover, as shown in FIG. 4, the claws 52 and 62 are alternately arranged in the circumferential direction with an interval therebetween.

In the circumferential direction, the side surface 52a of the claw 52 and the side surface 62b of the claw 62 face each other. Moreover, the side surface 52b of the claw 52 and the side surface 62a of the claw 62 face each other in the circumferential direction.

As shown in FIG. 2 , joint 43 has a first joint member 71 and a second joint member 72 . The joint 43 may have two second joint members 72 .

The first joint member 71 is made of synthetic resin or metal, for example. Therefore, the Young's modulus of the first joint member 71 is lower than the Young's modulus of the drive shaft 41 and lower than the Young's modulus of the driven shaft 42 . Also, the rigidity of the first joint member 71 is lower than the rigidity of the drive shaft 41 and lower than the rigidity of the driven shaft 42 .

In this embodiment, the material of the first joint member 71 is polyetheretherketone resin (PEEK) or polyphenylene sulfide resin (PPS) containing fibers such as carbon fiber or glass fiber. Note that the material of the first joint member 71 is not limited to this example.

As shown in FIG. 4, the first joint member 71 includes a central portion 80, two first arm portions 81, two second arm portions 82, a plurality of first projections 83, a plurality of second projections 84, a plurality of third projections 85, and a plurality of fourth projections 86. The number of first arms 81 and second arms 82 is not limited to this example. Moreover, as shown in FIG. 2, the first joint member 71 further has a mounting portion 87 .

As shown in FIG. 4, the central portion 80 is arranged on the first central axis Ax1 and the second central axis Ax2. For example, the central portion 80 is formed in a substantially columnar shape extending in the axial direction. Note that the shape of the central portion 80 is not limited to this example.

A first arm 81 extends radially from the central portion 80 . The two first arm portions 81 are arranged substantially evenly with an interval in the circumferential direction. The first arm portion 81 is positioned between the side surface 52a of the claw 52 and the side surface 62b of the claw 62 in the circumferential direction. The first arm 81 has two side surfaces 81a and 81b. Side 81a is an example of a first side. Side 81b is an example of a second side.

The side surface 81a is formed substantially flat and faces the side surface 52a of the claw 52 in the circumferential direction. In the first embodiment, side 81a is spaced apart from side 52a of pawl 52 . The side surface 81b is formed substantially flat and faces the side surface 62b of the claw 62 in the circumferential direction. In the first embodiment, side 81b is spaced apart from side 62b of pawl 62 . The side surface 81b is located on the opposite side of the side surface 81a in the circumferential direction.

For example, the side surfaces 81a and 81b are formed substantially parallel to a virtual plane extending radially through the first central axis Ax1. The side surface 81 a is arranged substantially parallel to the side surface 52 a of the claw 52 . The side surface 81 b is arranged substantially parallel to the side surface 62 a of the claw 62 . Note that the side surface 81a is not limited to this example.

A second arm 82 extends radially from the central portion 80 . The two second arm portions 82 are arranged substantially evenly with an interval in the circumferential direction. In the circumferential direction, the first arm portions 81 and the second arm portions 82 are alternately arranged substantially evenly. The second arm portion 82 is positioned between the side surface 52b of the claw 52 and the side surface 62a of the claw 62 in the circumferential direction. The second arm 82 has two side surfaces 82a, 82b.

The side surface 82a is formed substantially flat and faces the side surface 62a of the claw 62 in the circumferential direction. In the first embodiment, side 82 a is spaced from side 62 a of pawl 62 . The side surface 82b is formed substantially flat and faces the side surface 52b of the claw 52 in the circumferential direction. In the first embodiment, side 82b is spaced apart from side 52b of pawl 52 . The side surface 82b is located on the opposite side of the side surface 82a in the circumferential direction.

For example, the side surfaces 82a and 82b are formed substantially parallel to a virtual plane extending radially through the first central axis Ax1. The side surface 82 a is arranged substantially parallel to the side surface 62 a of the claw 62 . The side surface 82 b is arranged substantially parallel to the side surface 52 b of the claw 52 . Note that the side surface 82a is not limited to this example.

The first protrusion 83 protrudes from the side surface 81 a of the first arm portion 81 toward the side surface 52 a of the claw 52 . The second protrusion 84 protrudes from the side surface 81b of the first arm portion 81 toward the side surface 62b of the claw 62. As shown in FIG.

The third projection 85 protrudes from the side surface 82a of the second arm portion 82 toward the side surface 62a of the claw 62. As shown in FIG. The fourth projection 86 protrudes from the side surface 82b of the second arm portion 82 toward the side surface 52b of the claw 52. As shown in FIG.

The first projection 83 extends axially. In other words, the length of the first protrusion 83 in the axial direction is longer than the length of the first protrusion 83 in the direction (width direction) along the side surface 81a and perpendicular to the axial direction. Also, the length of the first projection 83 in the axial direction is longer than the length of the first projection 83 in the direction (height direction) orthogonal to the side surface 81a.

The first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 have substantially the same shape. Also, the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 are arranged at substantially the same position in the radial direction. The shapes and positions of the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 are not limited to this example.

The attachment portion 87 in FIG. 2 protrudes from the central portion 80 in the second axial direction Da2. The mounting portion 87 is formed, for example, in the shape of a column having a substantially octagonal or other non-circular cross-section. Note that the shape of the mounting portion 87 is not limited to this example.

The second joint member 72 is made of synthetic rubber, for example. Therefore, the Young's modulus of the second joint member 72 is lower than that of the first joint member 71 . Also, the rigidity of the second joint member 72 is lower than the rigidity of the drive shaft 41 and lower than the rigidity of the driven shaft 42 . Note that the material of the second joint member 72 is not limited to this example.

As shown in FIG. 4 , the second joint member 72 has a central portion 90 and four arm portions 91 . Moreover, as shown in FIG. 2, the second joint member 72 further has four protrusions 93 . The number of arms 91 is equal to the sum of the number of first arms 81 and the number of second arms 82 . The number of arms 91 and protrusions 93 is not limited to this example.

The central portion 90 is arranged on the first central axis Ax1 and the second central axis Ax2. For example, the central portion 90 is formed in a substantially columnar shape extending in the axial direction. Note that the shape of the central portion 90 is not limited to this example.

A mounting hole 97 is provided in the central portion 90 . The mounting hole 97 extends through the central portion 90 substantially in the axial direction. The mounting portion 87 of the first joint member 71 is fitted into the mounting hole 97 . Thereby, the second joint member 72 is attached to the first joint member 71 .

The mounting portion 87 is fitted into the mounting hole 97 so as to widen the mounting hole 97 . The attachment portion 87 abuts on the edge of the attachment hole 97 to restrict relative rotation of the first joint member 71 and the second joint member 72 around the first central axis Ax1.

As shown in FIG. 3 , at least part of the second joint member 72 is positioned between the end surface 51 a of the shaft 51 and the first joint member 71 . The second joint member 72 may be positioned between the end surface 61 a of the shaft 61 and the first joint member 71 .

As shown in FIG. 4, four arms 91 extend radially from central portion 90 . The four arm portions 91 are arranged substantially evenly with intervals in the circumferential direction. Each of the arms 91 is positioned between the claws 52 and 62 in the circumferential direction.

Two of the four arms 91 are axially adjacent to the two first arms 81 . The other two of the four arms 91 are axially adjacent to the two second arms 82 . In the circumferential direction, the arm portion 91 is wider than the first arm portion 81 and wider than the second arm portion 82 .

When the second joint member 72 is removed from the pump device 10, the width of the arm portion 91 in the circumferential direction is longer than the distance between the claws 52 and 62 in the circumferential direction. Therefore, the arm portion 91 is elastically deformed so as to be compressed in the circumferential direction between the claws 52 and 62 . The arms 91 press the claws 52 and 62 in the circumferential direction by the reaction force of elastic deformation.

As shown in FIG. 2, the protrusion 93 protrudes from the arm portion 91 in the second axial direction Da2. In other words, the protrusion 93 protrudes from the arm portion 91 toward the end surface 51 a of the shaft 51 . As shown in FIG. 1, the projection 93 is slightly spaced from the end surface 51a. Note that the projection 93 may come into contact with the end surface 51a.

The first joint member 71 and the second joint member 72 are capable of transmitting rotation about the first central axis Ax1 between the claws 52 and 62 . When the motor 12 rotates the rotor 33 , the drive shaft 41 rotates together with the rotor 33 . The pawl 52 of the drive shaft 41 pushes the pawl 62 of the driven shaft 42 via the first joint member 71 and the second joint member 72 . This causes the driven shaft 42 and the rotor 22 to rotate. Note that the first joint member 71 and the second joint member 72 can independently transmit rotation about the first central axis Ax1 between the claws 52 and 62 .

As shown in FIG. 1, the first bearing 44 is provided inside the motor 12, for example. The first bearing 44 is supported by the housing 31 of the motor 12 . The first bearing 44 supports the drive shaft 41 rotatably around the first central axis Ax1.

The second bearing 45 is provided inside the pump 11, for example. A second bearing 45 is supported by the housing 21 of the pump 11 . The second bearing 45 supports the driven shaft 42 rotatably around the second central axis Ax2.

FIG. 4 shows the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 before the drive shaft 41 and the driven shaft 42 are coupled with two-dot chain lines. Before joining, the cross section of each of the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 is formed in a substantially semicircular shape. Therefore, the cross section of each of the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 has an apex before being combined. Note that the cross sections of the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 are not limited to this example.

FIG. 5 is a side view showing the joint 43 before coupling the drive shaft 41 and the driven shaft 42 of the first embodiment. As shown in FIG. 5, the first protrusion 83 has a ridgeline E before being coupled. The ridgeline E is an imaginary line connecting the vertices of the first protrusion 83 at each position in the axial direction.

An edge E has a vertex P of the edge E. As shown in FIG. The vertex P is the portion of the first projection 83 that is farthest from the side surface 81a before the drive shaft 41 and the driven shaft 42 are coupled.

The ridgeline E is a portion extending linearly between the end of the ridgeline E and the vertex P in the first axial direction Da1, and between the end of the ridgeline E and the vertex P in the second axial direction Da2. and a portion extending linearly at the That is, the first protrusion 83 protrudes from the side surface 81a of the first arm portion 81 so as to taper toward the vertex P. As shown in FIG.

The vertex P may be located at the center of the first projection 83 in the axial direction, or may be arranged at a position different from the center of the first projection 83 in the axial direction. Note that the shape of the first projection 83 is not limited to this example. Also, the second projection 84 , the third projection 85 , and the fourth projection 86 have the ridge line E and the vertex P like the first projection 83 .

A part of the manufacturing method of the pump device 10 will be exemplified below. The method of manufacturing the pump device 10 is an example of the method of manufacturing the coupling. The method of manufacturing the coupling 13 is not limited to the method described below, and other methods may be used.

First, the drive shaft 41 and the driven shaft 42 are connected by the joint 43 . For example, as shown in FIG. 2, the pawl 52 of the drive shaft 41 is inserted between the side surface 81a of the first arm 81 and the side surface 82b of the second arm 82. As shown in FIG. Also, the claw 62 of the driven shaft 42 is inserted between the side surface 81 b of the first arm portion 81 and the side surface 82 a of the second arm portion 82 . The insertion of the claw 52 and the insertion of the claw 62 may be performed simultaneously or separately.

As shown in FIG. 4, when the claws 52 and 62 are inserted, the first projection 83 and the fourth projection 86 abut the claw 52 and the second projection 84 and the third projection 85 contact the claw 62. abut. In the circumferential direction, the distance between the apex of the first projection 83 and the apex of the second projection 84 is longer than the distance between the claws 52 and 62 . Also, in the circumferential direction, the distance between the apex of the third projection 85 and the apex of the fourth projection 86 is longer than the distance between the claws 52 and 62 . Therefore, the first protrusion 83 , the second protrusion 84 , the third protrusion 85 and the fourth protrusion 86 are compressed in the circumferential direction by the claws 52 and 62 . That is, the first joint member 71 is press-fitted between the claws 52 and 62 in the circumferential direction.

The stresses that the claws 52 and 62 exert on the first projection 83, the second projection 84, the third projection 85 and the fourth projection 86 when the claws 52 and 62 are inserted are is smaller than the yield point (elastic critical point) of the projection 84, the third projection 85, and the fourth projection 86. Therefore, by press-fitting the joint 43 between the claws 52 and 62 in the circumferential direction, the first projection 83, the second projection 84, the third projection 85, and the fourth projection 86 are formed in the circumferential direction. It elastically deforms so as to compress in the direction.

The first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 push the corresponding claws 52 and 62 by the reaction force of elastic deformation. Thereby, the relative positions of the drive shaft 41 and the driven shaft 42 in the radial direction and the circumferential direction are adjusted. In this embodiment, the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 are arranged so that the first central axis Ax1 and the second central axis Ax2 are aligned. , the drive shaft 41 and the driven shaft 42 are arranged.

The amount of elastic deformation of the central portion 80, the first arm portion 81, and the second arm portion 82 is less than the amount of elastic deformation. Further, the rigidity of the material of the first joint member 71 is higher than that of general synthetic rubber. Therefore, the first joint member 71 can prevent the first central axis Ax1 and the second central axis Ax2 from being kept out of alignment.

Since the ridgeline E extends linearly between the end of the ridgeline E and the apex P in the axial direction, the first protrusion 83 is gradually compressed as the claws 52 and 62 are inserted. Therefore, the first protrusion 83 , the second protrusion 84 , the third protrusion 85 and the fourth protrusion 86 can smoothly adjust the positions of the drive shaft 41 and the driven shaft 42 .

When the claws 52 and 62 are inserted, the claws 52 and 62 are also inserted between the corresponding two arm portions 91 of the second joint member 72 and come into contact with the two arm portions 91 . In the circumferential direction, the width of arm 91 is greater than the distance between claws 52 and 62 . Therefore, the arms 91 are circumferentially compressed by the claws 52 and 62 . That is, the second joint member 72 is press-fitted between the claws 52 and 62 in the circumferential direction.

The stress that the claws 52 and 62 exert on the arm portion 91 when the claws 52 and 62 are inserted is less than the yield point of the arm portion 91 . Therefore, when the arm portion 91 is press-fitted between the claws 52 and 62 in the circumferential direction, the arm portion 91 is elastically deformed so as to be compressed in the circumferential direction.

The arm portion 91 pushes the claws 52 and 62 by the reaction force of elastic deformation. Thereby, the relative positions of the drive shaft 41 and the driven shaft 42 in the radial direction and the circumferential direction are adjusted. In this embodiment, the arm portion 91 arranges the drive shaft 41 and the driven shaft 42 such that the first central axis Ax1 and the second central axis Ax2 are aligned.

The force with which the arm 91 pushes the claws 52 and 62 is smaller than the force with which the first projection 83 , the second projection 84 , the third projection 85 and the fourth projection 86 push the claws 52 and 62 . In this embodiment, arm 91 assists in pushing claws 52 and 62 .

As described above, the joint 43 connects the drive shaft 41 and the driven shaft 42 such that the first central axis Ax1 and the second central axis Ax2 are aligned. Motor 12 is then attached to pump 11 by screws 35 .

The motor 12 then rotates the drive shaft 41 with torque exceeding the rated output of the pump device 10 . The rated output of the pump device 10 is the rated output of the motor 12 when the pump device 10 as a product is used. For example, the stator 32 is supplied with a current exceeding the rated current.

The motor 12 rotates the drive shaft 41 in the first circumferential direction Dr1. As the drive shaft 41 rotates, the pawl 52 pushes the first protrusion 83 and the second protrusion 84 pushes the pawl 62 . Thereby, the joint 43 transmits rotation between the pawl 52 and the pawl 62, and the driven shaft 42 rotates. At this time, the stress acting on the first protrusion 83 and the stress acting on the second protrusion 84 are each greater than the yield points of the first protrusion 83 and the second protrusion 84 .

Since stress exceeding the yield point is generated in the first projection 83 and the second projection 84, the first projection 83 and the second projection 84 are plastically deformed (compressive plastic deformation) so as to be compressed in the circumferential direction. . Also, the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 may deform due to continuous loading and wear.

FIG. 6 is a cross-sectional view schematically showing the first projection 83 and the second projection 84 in the first embodiment. As shown in FIG. 6, the compressively plastically deformed first protrusion 83 and second protrusion 84 have flat top surfaces 83a and 84a, respectively.

Compressive plastic deformation of the first projections 83 and the second projections 84 causes a gap between the vertex of the first projections 83 (top surface 83a) and the vertex of the second projections 84 (top surface 84a) in the circumferential direction. distance becomes shorter. Therefore, the first joint member 71 is slightly movable with respect to the drive shaft 41 and the driven shaft 42 .

For example, drive shaft 41 and driven shaft 42 can rotate relatively slightly so that pawls 52 , 62 are spaced apart from first projection 83 and second projection 84 . Thereby, a gap G1 can be formed between the first projection 83 and the claw 52, and a gap G2 can be formed between the second projection 84 and the claw 62. In FIG. 6, the first joint member 71 forming the gap G1 is indicated by solid lines, and the first joint member 71 forming the gap G2 is indicated by two-dot chain lines.

As described above, the first protrusion 83 is plastically deformed so as to be compressed in the circumferential direction so that the gap G1 can be formed between the first protrusion 83 and the claw 52 . In addition, the second protrusion 84 is plastically deformed so as to be compressed in the circumferential direction so that the gap G2 can be formed between the second protrusion 84 and the claw 62 . The third protrusion 85 and the fourth protrusion 86 may also be compressively plastically deformed to form a gap. As described above, the pump device 10 is manufactured.

Whether or not the first projection 83, the second projection 84, the third projection 85, and the fourth projection 86 are subjected to compressive plastic deformation can be determined by CT scanning, for example. The first joint member 71 includes, for example, fibers such as carbon fibers or glass fibers. A CT scan can therefore measure the distribution of fibers in the first joint member 71 .

For example, if the density of fibers in the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 is greater than the density of fibers in other portions of the first joint member 71, It can be determined that the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 are compressively plastically deformed. The compressive plastic deformation of the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 may be determined by other methods. For example, when the material of the first joint member 71 is metal, the compressive plastic deformation of the first protrusion 83, the second protrusion 84, the third protrusion 85, and the fourth protrusion 86 is based on the arrangement of the crystals. can be determined.

The gaps G<b>1 and G<b>2 are formed after the motor 12 is attached to the pump 11 . Therefore, even after the gaps G1 and G2 are formed, the drive shaft 41 and the driven shaft 42 are kept at positions where the first central axis Ax1 and the second central axis Ax2 substantially coincide.

Since the first central axis Ax1 and the second central axis Ax2 are substantially aligned, the coupling 13 can suppress radial load acting on the drive shaft 41 and the driven shaft 42 . Therefore, the coupling 13 can suppress the occurrence of vibration and noise in the rotating drive shaft 41 and driven shaft 42, thereby improving durability.

Even if the first central axis Ax1 and the second central axis Ax2 coincide, the central axes of the first bearing 44 and the second bearing 45 are separated from the first central axis Ax1 and the second central axis Ax2. There may be deviations. However, since the coupling 13 can form the gaps G1 and G2, there is dimensional play. For this reason, the coupling 13 is displaced between the first and second bearings 44 and 45 due to the deviation between the first and second central axes Ax1 and Ax2 and the first and second bearings 44 and 45 . can reduce the load on the bearing 45.

By forming the gaps G1 and G2, there is a possibility that the first projection 83 collides with the side surface 52a of the pawl 52 and the second projection 84 collides with the side surface 62b of the pawl 62 when the drive shaft 41 rotates. be. However, the gaps G1 and G2 are minute gaps caused by compressive plastic deformation. Therefore, the sound generated by the collision between the first projection 83 and the second projection 84 and the claws 52 and 62 remains minute.

When the motor 12 rotates the drive shaft 41 with the torque of the rated output, the stress acting on the first projection 83 and the stress acting on the second projection 84 are respectively It is less than the yield point of the protrusion 84. In other words, the torque acting on the drive shaft 41 for driving the pump 11 is smaller than the torque acting on the drive shaft 41 for compressively plastically deforming the first protrusion 83 and the second protrusion 84 . Therefore, when the pump device 10 operates at rated speed, the first protrusion 83 and the second protrusion 84 are less likely to undergo further compressive plastic deformation. Note that the first projection 83 and the second projection 84 may be deformed by repeated load and wear.

The second joint member 72 can suppress tilting of the joint 43 . For example, a force around the third central axis Ax3 in FIG. 3 may act on the joint 43 . The third central axis Ax3 is the central axis of rotation (inclination) of the joint 43 and intersects the first central axis Ax1. In this embodiment, the third central axis Ax3 is orthogonal to the first central axis Ax1.

The arm portion 91 pushes the claws 52 and 62 by the reaction force of elastic deformation. Therefore, a frictional force is generated between the arm portion 91 and the claws 52 and 62 . The arm portion 91 prevents the joint 43 from rotating (tilting) about the third central axis Ax3 with respect to the drive shaft 41 and the driven shaft 42 due to the frictional force.

Furthermore, when the joint 43 rotates about the third central axis Ax3 with respect to the drive shaft 41 and the driven shaft 42, the projection 93 contacts the end surface 51a of the shaft 51. As shown in FIG. Thereby, the protrusion 93 restricts the joint 43 from rotating (tilting) about the third central axis Ax3 with respect to the drive shaft 41 and the driven shaft 42 .

As described above, the arm portion 91 pushes the claws 52 and 62 by the reaction force of elastic deformation. Therefore, the arm portion 91 can suppress the vibration of the drive shaft 41 and the driven shaft 42 by the reaction force of elastic deformation. Furthermore, the arm portion 91 can further reduce the noise caused by the collision between the first protrusion 83 and the claw 52 and the noise caused by the collision between the second projection 84 and the claw 62 due to the reaction force of elastic deformation.

When manufacturing the coupling 13 according to the first embodiment described above, the first joint member 71 is press-fitted between the claws 52 and 62 in the circumferential direction, and the first projection 83 is compressed in the circumferential direction. elastically deformed to Thereby, the first projection 83 can arrange the claws 52 and 62 and the first joint member 71 at desired positions by the reaction force of elastic deformation. For example, the first protrusion 83 can arrange the claws 52 and 62 such that the first central axis Ax1 and the second central axis Ax2 are aligned. As a result, the coupling 13 can suppress vibration and noise caused by the deviation between the first central axis Ax1 and the second central axis Ax2. Further, the first protrusion 83 is plastically deformed so as to be compressed in the circumferential direction so that the gap G1 can be formed between the first protrusion 83 and the claw 52 . As a result, the coupling 13 allows, for example, the first bearing 44 and the second bearing 45 that support the drive shaft 41 and the driven shaft 42 to be loaded by the strong coupling between the drive shaft 41 and the driven shaft 42. can be suppressed. As described above, the coupling 13 suppresses the vibration between the drive shaft 41 and the driven shaft 42 and suppresses the application of load to the parts in contact with the drive shaft 41 and the driven shaft 42 . Therefore, the coupling 13 can suppress deterioration in durability and extend its life.

Furthermore, the coupling 13 can connect the drive shaft 41 and the driven shaft 42 more accurately than a spigot joint without spigot joint. As a result, the coupling 13 does not require a spigot joint structure, which can suppress an increase in cost.

Furthermore, the gap G1 is formed by compressive plastic deformation of the first projection 83, and is therefore minute. Therefore, the coupling 13 can reduce the noise caused by the collision between the first protrusion 83 and the claw 52 .

The second joint member 72 is attached to the first joint member 71 and positioned between the claws 52 and 62 in the circumferential direction. The second joint member 72 is elastically deformed so as to be compressed in the circumferential direction between the claws 52 and 62 . The second joint member 72 presses the claws 52 and 62 by the reaction force of elastic deformation. When the first joint member 71 is about to tilt from a predetermined posture, the second joint member 72 is arranged between the second joint member 72 and the claw 52 and between the second joint member 72 and the claw 62 . Frictional force is generated between them. The second joint member 72 suppresses tilting of the first joint member 71 due to the frictional force.

Furthermore, the second joint member 72 can arrange the claws 52 and 62 so that the first central axis Ax1 and the second central axis Ax2 are aligned by the reaction force of elastic deformation. In addition, the second joint member 72 can reduce the noise caused by the collision between the first projection 83 and the claw 52 due to the reaction force of elastic deformation.

The second joint member 72 is positioned between the end face 51 a of the shaft 51 and the first joint member 71 . The second joint member 72 contacts the end surface 51a when the first joint member 71 rotates (tilts) with respect to the drive shaft 41 around a third central axis Ax3 that intersects with the first central axis Ax1. . Thereby, the second joint member 72 suppresses the inclination of the first joint member 71 .

The first joint member 71 has a second protrusion 84 that protrudes from the side surface 81b toward the claw 62 and is compressed and plastically deformed in the circumferential direction. For example, when the first joint member 71 is fitted between the claws 52 and 62 , the second projections 84 are elastically deformed together with the first projections 83 . Also, the second projection 84 undergoes compressive plastic deformation together with the first projection 83 . As a result, the coupling 13 can distribute the load during elastic deformation and plastic deformation to the first protrusion 83 and the second protrusion 84 .

(Second embodiment)
A second embodiment will be described below with reference to FIG. In the following description of the multiple embodiments, constituent elements having functions similar to those already explained are given the same reference numerals as the constituent elements already explained, and further explanation may be omitted. . In addition, a plurality of components with the same reference numerals may not all have common functions and properties, and may have different functions and properties according to each embodiment.

FIG. 7 is a cross-sectional view schematically showing the coupling 13 according to the second embodiment. As shown in FIG. 7, the joint 43 of the second embodiment has a first joint member 271 instead of the first joint member 71. As shown in FIG. The first joint member 271 is the same as the first joint member 71 of the first embodiment, except as described below.

The first joint member 271 is provided with two first grooves 288 and two second grooves 289 . The first groove 288 is an example of a groove. The first groove 288 opens at the end face 81c of the first arm 81 in the radial direction and extends between both ends of the first arm 81 in the axial direction. The second groove 289 opens at the end face 82c of the second arm 82 in the radial direction and extends between the ends of the second arm 82 in the axial direction.

The first groove 288 is located between the two side surfaces 81a, 81b of the first arm 81. As shown in FIG. The bottom of the first groove 288 on the radially inner side is located radially inwardly of the end of the first protrusion 83 on the radially outer side. Also, the bottom of the first groove 288 on the radially inner side is located radially inwardly of the end of the second projection 84 on the radially outer side.

The second groove 289 is located between the two side surfaces 82a, 82b of the second arm 82. As shown in FIG. The bottom of the second groove 289 on the radially inner side is positioned radially inwardly of the end of the third projection 85 on the radially outer side. Also, the bottom of the second groove 289 on the radially inner side is located radially inwardly of the end of the fourth projection 86 on the radially outer side.

In the coupling 13 of the second embodiment described above, the first joint member 271 is provided with the first groove 288 located between the side surfaces 81a and 81b. As a result, the rigidity of the first joint member 271 is reduced, and the portion of the first joint member 271 including the first protrusion 83 is easily deformed. Therefore, the coupling 13 can suppress damage to the claws 52 and 62 and the first projection 83 due to reaction force during deformation.

Note that the first groove 288 and the second groove 289 reduce the rigidity of the first joint member 71 . However, the first protrusion 83 and the second protrusion 84 are subjected to compressive plastic deformation as in the first embodiment.

(Third embodiment)
A third embodiment will be described below with reference to FIG. FIG. 8 is a cross-sectional view schematically showing the coupling 13 according to the third embodiment. As shown in FIG. 8, the joint 43 of the third embodiment has a first joint member 371 instead of the first joint member 71. As shown in FIG. The first joint member 371 is the same as the first joint member 71 of the first embodiment, except as described below.

The first joint member 371 has two first arms 381 and two second arms 381 instead of the first arm 81 , the second arm 82 , the second protrusion 84 and the fourth protrusion 86 . It has two arms 382 . First arm 381 and second arm 382 are the same as first arm 81 and second arm 82 of the first embodiment, except as described below.

The first joint member 371 does not have the second protrusion 84 and the fourth protrusion 86 . A side surface 81 b of the first arm portion 381 contacts the claw 62 . Also, the side surface 82 b of the second arm portion 382 abuts on the claw 52 .

In the coupling 13 of the third embodiment described above, the first joint member 371 has the first projection 83 and the third projection 85, and the second projection 84 and the fourth projection 86. omitted. As a result, the coupling 13 can have a reduced number of protrusions, and the shape of the protrusions can be easily managed during manufacturing.

(Fourth embodiment)
A fourth embodiment will be described below with reference to FIG. FIG. 9 is a cross-sectional view schematically showing a coupling 13 according to the fourth embodiment. As shown in FIG. 9, the joint 43 of the fourth embodiment has a first joint member 471 instead of the first joint member 71. As shown in FIG. The first joint member 471 is the same as the first joint member 71 of the first embodiment, except as described below.

The first joint member 471 has a second arm portion 482 instead of the second arm portion 82 , the third protrusion 85 and the fourth protrusion 86 . Second arm 482 is the same as second arm 82 of the first embodiment, except as described below.

The first joint member 471 does not have the third protrusion 85 and the fourth protrusion 86 . A side surface 82 a of the second arm portion 482 contacts the claw 62 . Also, the side surface 82 b of the second arm portion 482 contacts the claw 52 .

In the coupling 13 of the fourth embodiment described above, the first joint member 471 has the first projection 83 and the second projection 84, and has the third projection 85 and the fourth projection 86. omitted. As a result, the coupling 13 can have a reduced number of protrusions, and the shape of the protrusions can be easily managed during manufacturing.

The first joint member 471 has a first protrusion 83 and a second protrusion 84 . A side surface 52 a of the claw 52 facing the first circumferential direction Dr<b>1 in which the drive shaft 41 rotates contacts the first projection 83 . Also, the side surface 62 b of the claw 62 contacts the second projection 84 of the first joint member 471 pushed by the claw 52 of the drive shaft 41 . That is, the first protrusion 83 and the second protrusion 84 are positioned in the rotation transmission path between the claws 52 and 62 . As a result, the first protrusion 83 and the second protrusion 84 can be easily subjected to compressive plastic deformation.

(Fifth embodiment)
A fifth embodiment will be described below with reference to FIG. FIG. 10 is a cross-sectional view schematically showing the coupling 13 according to the fifth embodiment. As shown in FIG. 10 , the joint 43 of the fifth embodiment has a first joint member 571 instead of the first joint member 71 . The first joint member 571 is the same as the first joint member 71 of the first embodiment, except as described below.

The first joint member 571 has a first arm portion 581 instead of the first arm portion 81 , the first protrusion 83 and the second protrusion 84 . The first arm 581 is the same as the first arm 81 of the first embodiment, except as described below.

The first joint member 571 does not have the first protrusion 83 and the second protrusion 84 . A side surface 81 a of the first arm portion 581 contacts the claw 52 . Also, the side surface 81 b of the first arm portion 581 abuts on the claw 62 .

In the coupling 13 of the fifth embodiment described above, the first joint member 571 has the third projection 85 and the fourth projection 86, and has the first projection 83 and the second projection 84. omitted. As a result, the coupling 13 can have a reduced number of protrusions, and the shape of the protrusions can be easily managed during manufacturing. In addition, in the fifth embodiment, the third protrusion 85 is an example of the second protrusion, and the fourth protrusion 86 is an example of the first protrusion.

The first joint member 571 has a third protrusion 85 and a fourth protrusion 86 . A side surface 52 a of the claw 52 facing the first circumferential direction Dr<b>1 in which the drive shaft 41 rotates contacts the first arm portion 581 . A side surface 62 b of the claw 62 abuts on the first arm portion 581 pushed by the claw 52 of the drive shaft 41 . That is, the third protrusion 85 and the fourth protrusion 86 are positioned outside the rotational transmission path between the claws 52 and 62 . Thereby, the coupling 13 can suppress unintended compressive plastic deformation of the third projection 85 and the fourth projection 86 .

As an example, the coupling according to at least one embodiment described above includes a first member rotatable around a first rotation axis, and the first member in an axial direction along the first rotation axis. a first rotating body having a first end face provided at an end of a second member rotatable about a second rotation axis and spaced from the first member in the axial direction; , a second end surface provided at the end of the second member in the direction along the second rotation axis and facing the first end surface; and the first rotor. a first rotation transmission part provided in the axial direction between the first end face and the second end face; a second rotation transmission portion positioned between the first end surface and the second end surface and aligned with the first rotation transmission portion in a circumferential direction about the first rotation axis; a first side surface positioned between the first rotation transmission portion and the second rotation transmission portion in the circumferential direction and facing the first rotation transmission portion in the circumferential direction; a second side surface facing a second rotation transmission section; and a first protrusion protruding from the first side surface toward the first rotation transmission section; Rotation around the first rotation axis can be transmitted between the second rotation transmission portion and the first projection and the first projection by compressive plastic deformation of the first projection in the circumferential direction. and a first joint member capable of forming a gap with respect to the rotation transmitting portion. For example, before the first projection undergoes compressive plastic deformation in the circumferential direction (or when the amount of compressive plastic deformation in the circumferential direction is smaller than a predetermined amount), a gap is formed between the first projection and the first rotation transmitting portion. is not formed, and the first projection undergoes compressive plastic deformation in the circumferential direction (or the amount of compressive plastic deformation in the circumferential direction increases by a predetermined amount or more), so that the first projection and the first rotation transmission portion A gap is formed in the In this case, for example, the first joint member is fitted between the first rotation transmission portion and the second rotation transmission portion before the first protrusion undergoes a predetermined amount or more of compressive plastic deformation in the circumferential direction. At this time, the first protrusion is elastically deformed so as to be compressed in the circumferential direction, and the reaction force of the elastic deformation causes the first rotation transmission section, the second rotation transmission section, and the first joint member to move. It can be placed in any desired position. For example, the first protrusion can arrange the first rotation transmission part and the second rotation transmission part so that the first rotation axis and the second rotation axis are aligned. As a result, the coupling can suppress vibration and noise caused by the deviation between the first rotating shaft and the second rotating shaft. Further, for example, when the first projection undergoes compressive plastic deformation in the circumferential direction due to pressure contact with the first rotation transmitting portion or the like (or the amount of compressive plastic deformation in the circumferential direction increases by a predetermined amount or more), the first projection and the first rotation transmission portion can form a gap that becomes a play. Accordingly, the coupling can prevent, for example, bearings that support the first rotating body and the second rotating body from receiving a load due to the strong coupling between the first rotating body and the second rotating body. As described above, the coupling suppresses the vibration between the first rotating body and the second rotating body, and prevents the load from acting on the parts that come into contact with the first rotating body and the second rotating body. Suppress. Therefore, the coupling can suppress deterioration in durability, and can extend the life of the coupling.

As an example, the coupling is attached to the first joint member, is positioned between the first rotation transmission section and the second rotation transmission section in the circumferential direction, and is located between the first rotation transmission section and the second rotation transmission section in the circumferential direction. a second joint member elastically deformed to be compressed in the circumferential direction between the portion and the second rotation transmission portion. Therefore, as an example, the second joint member pushes the first rotation transmission section and the second rotation transmission section by the reaction force of elastic deformation. When the first joint member is about to incline from a predetermined posture, the second joint member is configured to rotate between the second joint member and the first rotation transmission section and between the second joint member and the second rotation transmission section. Frictional force is generated with the transmission part. The second joint member can suppress tilting of the first joint member due to the frictional force.

In the above coupling, for example, the second joint member is positioned between the first end surface and the first joint member, and the first joint member is positioned relative to the first rotating body. and abuts on the first end face when rotating around a third rotation axis intersecting the first rotation axis. Therefore, as an example, the second joint member can suppress tilting of the first joint member.

In the above coupling, as an example, the first joint member has a second projection that protrudes from the second side surface toward the second rotation transmission section and is compressed and plastically deformed in the circumferential direction. . Therefore, as an example, for example, when the first joint member is fitted between the first rotation transmission portion and the second rotation transmission portion, the second projection elastically deforms together with the first projection. Also, the second projection undergoes compressive plastic deformation together with the first projection. Thereby, the coupling can distribute the load during elastic deformation and plastic deformation to the first projection and the second projection.

In the above coupling, for example, the first joint member is provided with a groove positioned between the first side surface and the second side surface. Therefore, as an example, the rigidity of the first joint member is reduced, and the portion of the first joint member that includes the first projection is easily deformed. Therefore, the coupling can suppress damage to the first rotation transmission section, the second rotation transmission section, and the first projection due to reaction force during deformation.

The method of manufacturing a coupling according to at least one embodiment described above includes, as an example, a first member rotatable around a first rotation axis and the first member in an axial direction along the first rotation axis. a first rotating body having a first end face provided at an end of one member; and a second rotating body rotatable about a second axis of rotation and spaced apart from the first member in the axial direction. and a second end surface provided at the end of the second member in the direction along the second rotation axis and facing the first end surface; a first rotation transmitting portion provided on the rotating body and positioned between the first end face and the second end face in the axial direction; and a first rotation transmitting portion provided on the second rotating body and positioned in the axial direction a second rotation transmission portion located between the first end surface and the second end surface in and aligned with the first rotation transmission portion in a circumferential direction around the first rotation axis; a first side surface partially located between the first rotation transmission portion and the second rotation transmission portion in the circumferential direction and facing the first rotation transmission portion in the circumferential direction; a second side surface facing toward the second rotation transmission portion in a direction; and a first protrusion protruding from the first side surface toward the first rotation transmission portion, a first joint member capable of transmitting rotation about the first rotation axis between a transmission portion and the second rotation transmission portion, wherein By press-fitting the first joint member between the first rotation transmission portion and the second rotation transmission portion, the first protrusion is elastically deformed so as to be compressed in the circumferential direction. and plastically deforming the first projection so as to compress the first projection in the circumferential direction so as to form a gap between the first projection and the first rotation transmitting portion. Therefore, as an example, the first protrusion can arrange the first rotation transmission section, the second rotation transmission section, and the first joint member at desired positions by the reaction force of elastic deformation. For example, the first protrusion can arrange the first rotation transmission part and the second rotation transmission part so that the first rotation axis and the second rotation axis are aligned. As a result, the coupling can suppress vibration and noise caused by the deviation between the first rotating shaft and the second rotating shaft. In addition, since a gap can be formed between the first projection and the first rotation transmitting portion, the coupling is such that, for example, the bearing that supports the first rotating body and the second rotating body The strong coupling between the rotating body and the second rotating body can suppress receiving a load. The method of manufacturing the coupling described above suppresses the vibration between the first rotating body and the second rotating body, and prevents the load from acting on the parts in contact with the first rotating body and the second rotating body. Suppress. Therefore, the coupling can suppress deterioration in durability, and can extend the life of the coupling.

In the above description, inhibition is defined as, for example, preventing an event, action or effect from occurring or reducing the degree of an event, action or effect. Also, in the above description, the restriction is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range. .

Although the embodiments of the present invention have been exemplified above, the above embodiments and modifications are merely examples, and are not intended to limit the scope of the invention. The above embodiments and modifications can be implemented in various other forms, and various omissions, replacements, combinations, and modifications can be made without departing from the scope of the invention. Also, the configuration and shape of each embodiment and each modification can be partially exchanged.

Reference Signs List 13 Coupling 41 Drive shaft (first rotating body) 42 Driven shaft (second rotating body) 51 Shaft (first member) 51 a End face (first end face) 52 ... Claw (first rotation transmission portion) 61 ... Shaft (second member) 61a ... End surface (second end surface) 62 ... Claw (second rotation transmission portion) 71 ... First joint member , 72... Second joint member 83... First protrusion 84... Second protrusion Ax1... First central axis (first rotation axis) Ax2... Second central axis (second axis), Ax3... third central axis (third rotation axis), G1... gap.

Claims (6)

A first rotation having a first member rotatable about a first rotation axis and a first end face provided at an end of the first member in an axial direction along the first rotation axis body and
a second member rotatable about a second axis of rotation and axially spaced apart from the first member; and an end of the second member in a direction along the second axis of rotation. and a second end surface facing the first end surface, and
a first rotation transmitting portion provided on the first rotating body and positioned between the first end face and the second end face in the axial direction;
provided on the second rotating body, positioned between the first end surface and the second end surface in the axial direction, and transmitting the first rotation in the circumferential direction around the first rotation axis; a second rotation transmission unit aligned with the unit;
a first side surface at least partially positioned between the first rotation transmission portion and the second rotation transmission portion in the circumferential direction and facing the first rotation transmission portion in the circumferential direction; a second side surface facing the second rotation transmission portion in the circumferential direction; and a first protrusion protruding from the first side surface toward the first rotation transmission portion; Rotation around the first rotation axis can be transmitted between the rotation transmission portion and the second rotation transmission portion, and the first projection and the first projection are compressed by compressive plastic deformation of the first projection in the circumferential direction. a first joint member capable of forming a gap with the first rotation transmission section;
A coupling comprising attached to the first joint member and positioned between the first rotation transmission portion and the second rotation transmission portion in the circumferential direction; a second joint member elastically deformed so as to be compressed in the circumferential direction between the part,
2. The coupling of claim 1, further comprising: The second joint member is positioned between the first end face and the first joint member, and the first joint member is positioned with respect to the first rotating body as the first rotating shaft. 3. The coupling of claim 2, abutting said first end face when rotated about a third intersecting axis of rotation. The first joint member has a second protrusion that protrudes from the second side surface toward the second rotation transmission section and is compressed and plastically deformed in the circumferential direction,
A coupling according to any one of claims 1 to 3. 5. A coupling according to any one of claims 1 to 4, wherein said first joint member is provided with a groove located between said first side surface and said second side surface. A first rotation having a first member rotatable about a first rotation axis and a first end face provided at an end of the first member in an axial direction along the first rotation axis body and
a second member rotatable about a second axis of rotation and axially spaced apart from the first member; and an end of the second member in a direction along the second axis of rotation. and a second end surface facing the first end surface, and
a first rotation transmitting portion provided on the first rotating body and positioned between the first end face and the second end face in the axial direction;
provided on the second rotating body, positioned between the first end surface and the second end surface in the axial direction, and transmitting the first rotation in the circumferential direction around the first rotation axis; a second rotation transmission unit aligned with the unit;
a first side surface at least partially positioned between the first rotation transmission portion and the second rotation transmission portion in the circumferential direction and facing the first rotation transmission portion in the circumferential direction; a second side surface facing the second rotation transmission portion in the circumferential direction; and a first protrusion protruding from the first side surface toward the first rotation transmission portion; a first joint member capable of transmitting rotation about the first rotation axis between the rotation transmission portion and the second rotation transmission portion;
A method for manufacturing a coupling comprising
By press-fitting the first joint member between the first rotation transmission portion and the second rotation transmission portion in the circumferential direction, the first protrusion is elastically compressed in the circumferential direction. transforming and
plastically deforming the first projection so as to compress the first projection in the circumferential direction so as to form a gap between the first projection and the first rotation transmitting portion;
A method of manufacturing a coupling comprising

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