JP2001295853A - Oldham's coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an Oldham's coupling enlarging a rotation torque transmitted from a drive shaft side to a driven shaft side. SOLUTION: A first and a second engagement projection 21g and 21h of a first coupling member 21 to be fitted and fixed to the drive shaft 13 of a motor, etc., are engaged with a first and a second engagement recess 23c and 23d of a spacer 23. A third and a forth engagement projection 22g and 22h of a second coupling member 22 to be fitted and fixed to the driven shaft 15 of a loading appliance 14 side are engaged with a third and a forth engagement recess 23g and 23h of the spacer 23. The radial formation width t of the first and the second engagement projection 21g and 21h is set smaller than the radial formation width w of the first and the second engagement recess 23c and 23d of the spacer 23. Similarly, the radial formation width t of the third and the forth engagement projection 22g and 22h is set smaller than the radial formation width w of the third and the forth engagement recess 23g and 23h.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Oldham coupling for transmitting power by being connected between a drive shaft such as a motor and a driven shaft of a load device.

[0002]

2. Description of the Related Art Generally, an Oldham coupling is a first coupling member fitted and fixed to a driving shaft side, a second coupling member fitted and fixed to a driven shaft side, and a first coupling member between the first and second coupling members. And a spacer interposed therebetween. First and second engagement projections are formed on the first joint member,
Third and fourth engagement projections are formed on the second joint member. The first surface of the spacer on the drive shaft side is
First and second engagement recesses to be engaged with the second engagement projections are formed, and the surface of the spacer on the driven shaft side is provided with the third and fourth engagement projections engaged with the third and fourth engagement projections. Third and fourth engagement recesses are formed. When the first and second engagement protrusions of the first joint member revolve by the rotation of the drive shaft, the first and second torque transmitting surfaces formed on the engagement protrusions are moved to the first and second torque transmitting surfaces of the spacer. The rotational torque is transmitted to the third and fourth torque transmitting surfaces formed in the first and second engagement recesses. Similarly, the rotational torque is transmitted from the torque transmitting surfaces formed in the third and fourth engaging concave portions of the spacer to the torque receiving surface formed in the engaging convex portion of the second joint member.

[0003]

However, the above-mentioned conventional Oldham coupling includes first and second engagement projections, first to fourth projections.
The engaging concave portion, the third and the fourth engaging convex portions are formed so as to have the same thickness in the radial direction from the center axis of the Oldham coupling and to have the same contact area between the torque transmitting surface and the torque receiving surface. Had the following problems.

That is, the Oldham coupling is configured to easily transmit the rotational torque even if the center axes of the drive shaft and the driven shaft are slightly shifted. If the center axis is shifted, the spacer is used. It will be slightly displaced in the radial direction. At this time, there is a problem that the contact area between the torque transmitting surface of the first and second joint members and the spacer and the torque transmitting surface is reduced, and thus the rotational torque transmitting capability is reduced.

[0005] It is an object of the present invention to provide an Oldham coupling which can solve the above-mentioned problems in the prior art and can improve the transmission capability of rotational torque.

[0006]

In order to solve the above-mentioned problems, the invention according to the first aspect is characterized in that the first engagement convex portion and the second engagement convex portion are fixedly fitted to a drive shaft and are provided on one surface. A first joint member having a portion, a second joint member fitted and fixed to a driven shaft, and having a third engagement convex portion and a fourth engagement convex portion on one surface; and the first and second joints A first engaging concave portion and a second engaging concave portion interposed between members and engaging the first engaging convex portion and the second engaging convex portion, and a third engaging convex portion and a fourth engagement An Oldham coupling comprising a spacer having a third engaging concave portion and a fourth engaging concave portion for engaging a convex portion,
A first torque transmitting surface of the engagement projection and the second engagement projection;
The area of each of the torque transmitting surfaces is different from the area of each of the first and second torque transmitting surfaces of the first and second engaging concave portions of the spacer, and the third area of the spacer is And the respective areas of the third and fourth torque transmitting surfaces of the fourth engaging concave portion and the third torque transmitting surface and the fourth torque transmitting surface of the third engaging convex portion and the fourth engaging convex portion. The gist is that the area is different from each other.

According to a second aspect of the present invention, in the first aspect, the respective areas of the first torque transmitting surface and the second torque transmitting surface are equal to the first torque of the first engaging concave portion and the second engaging concave portion. Each of the third and fourth torque transmitting surfaces is formed to be smaller than the area of each of the third and fourth torque transmitting surfaces. The gist is that it is formed smaller than the area.

According to a third aspect of the present invention, in the second aspect, the width of each of the first torque transmitting surface and the second torque transmitting surface in the radial direction is equal to the first torque transmitting surface and the second torque transmitting surface. The third torque transmitting surface and the fourth torque transmitting surface are formed smaller than the respective forming widths of the transmitting surfaces, and the respective forming widths in the radial direction of the third torque transmitting surface and the fourth torque transmitting surface are smaller in the radial direction of the third torque transmitting surface and the fourth torque transmitting surface. The gist is that they are formed to be smaller than the respective forming widths.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The Oldham coupling 11 is interposed between a drive shaft 13 provided on a motor 12 and a driven shaft 15 on a load device 14 side, as shown in FIG.

The first joint member 21 constituting the Oldham joint 11 has a thick and short cylindrical main body 21a and a mounting hole 21b formed at the center thereof for inserting the drive shaft 13 therethrough.
And a slit 21c formed in the diametrical direction so as to pass through the center axis O1 with respect to the main body 21a. Also, the main body 21a of the first joint member 21 has a structure shown in FIG.
As shown in (a), a screw hole 21d is formed corresponding to the slit 21c, a bolt insertion hole 21e is formed corresponding to the screw hole 21d, and a step portion 21f is formed outside the insertion hole 21e. Is formed. And the mounting hole 2
The main shaft 21a of the first joint member 21 is elastically deformed by screwing the bolt 24 from the step portion 21f and the insertion hole 21e into the screw hole 21d in a state where the drive shaft 13 is inserted into the drive shaft 1b. They are tightened and fixed.

As shown in FIG. 3B, first and second engaging projections 21g and 21h are integrally formed on one surface of the main body 21a of the first joint member 21 at an angle of 180 ° with respect to the outer periphery. Is formed. The leading surfaces of the first and second engaging projections 21g and 21h in the revolving directions (see arrows) are the first and second torque transmitting surfaces 21i and 21j.

The second joint member 22 has basically the same construction as the first joint member 21. That is,
The main body 22a has a mounting hole 22b and a slit 22c. FIG. 3 shows the main body 22a.
As shown in (d), a screw hole 22d, an insertion hole 22e, and a step 22f are formed. And the mounting hole 22
b, while the driven shaft 15 is inserted, the bolt 25 is
The main body 22a of the second joint member 22 is elastically deformed by being screwed into the screw hole 22d from the insertion hole 2f and the insertion hole 22e, and is fastened and fixed to the outer peripheral surface of the driven shaft 15.

Further, the main body 22a of the second joint member 22
As shown in FIG. 3 (c), third and fourth engagement projections 22g and 22h are formed on one side, and the surfaces opposite to the leading side in the revolving direction are the third and fourth torques. The transmission surfaces 22i and 22j are provided.

The spacer 23 is formed of a hard synthetic resin material.
Is formed on the surface of the main body 23a on the drive shaft side.
And the first for engaging the second engagement projections 21g and 21h.
And second engagement recesses 23c, 23d.
Further, third and fourth engagement recesses 23g and 23h for engaging the third and fourth engagement projections 22g and 22h of the second joint member 22 are formed on the surface of the main body 23a on the driven shaft side. Have been. Then, the first and second engagement concave portions 23c, 2
The surfaces preceding in the revolving direction 3d are the first and second torque receiving surfaces 23e and 23f, and the trailing surface in the revolving direction of the third and fourth engaging recesses 23g and 23h is the third surface.
And the fourth torque transmission surfaces 23i and 23j.

The radially formed width t of the first and second engagement projections 21g and 21h of the first joint member 21 is the radial width of the first and second engagement recesses 23c and 23d of the spacer 23. It is set smaller than the formation width w. Similarly, the third and fourth engagement projections 22 of the second joint member 22
The radially formed widths t of the g and 22h are set smaller than the radially formed widths w of the third and fourth engagement recesses 23g and 23h of the spacer 23.

Next, the operation of the Oldham coupling 11 configured as described above will be described. When the drive shaft 13 of the motor 12 is rotated in FIG.
The driven shaft 15 is rotated via 1 to operate the load device 14. At this time, the rotation of the first joint member 21 fitted and fixed to the drive shaft 13 causes the first and second engaging projections 21g and 21h provided on the main body 21a to rotate the spacer 23,
The rotational motion of the spacer 23 is transmitted to the third and fourth engagement projections 22g and 22h of the second joint member 22, and the driven shaft 15
Is rotated.

The first and second engaging projections 21g, 21h
The first and second torque transmitting surfaces 21i, 21j transmit the torque to the first and second torque transmitting surfaces 23e, 23f of the first and second engaging recesses 23c, 23d of the spacer 23. The third and fourth torque transmitting surfaces 23i, 23j of the third and fourth engaging recesses 23g, 23h are connected to the third and fourth engaging projections 22g, 22h of the second joint member 22, respectively. 4 Transmits torque to the torque receiving surfaces 22i and 22j. At this time, when the center axes O1 and O2 of the drive shaft 13 and the driven shaft 15 are slightly eccentric, respectively, the spacer 23 is slightly displaced in the radial direction with respect to the first joint member 21, or By slightly displacing with respect to the two joint members 22, the eccentricity of the drive shaft 13 and the driven shaft 15 is absorbed, and the torque is smoothly transmitted.

Next, the effects of the Oldham coupling 11 configured as described above will be described together with the configuration. (1) In the above embodiment, the first and second joint members 2
The first and second engagement recesses 23c of the spacer 23 are larger than the radially formed widths t of the first and second engagement projections 21g and 21h and the third and fourth engagement projections 22g and 22h. ,
23d and the width w in the radial direction of the third and fourth engagement recesses 23g and 23h are set large. Then, the area of the first torque transmitting surface 23e (the second torque transmitting surface 23f) is changed to the first torque transmitting surface 21i (the second torque transmitting surface 21f).
j), the third torque transmitting surface 23i
The area of the (fourth torque transmitting surface 23j) is larger than the area of the third torque transmitted surface 22i (the fourth torque transmitted surface 22j). Therefore, when the center axes O1 and O2 of the drive shaft 13 and the driven shaft 15 are slightly displaced, the first and second torque transmitting surfaces 21i and 21j and the first and second torque transmitted surfaces 23e and 23f are displaced. The reduction of the respective contact areas is suppressed, and the third and fourth torque transmitting surfaces 23i, 23j are similarly controlled.
, And the third and fourth torque transmitting surfaces 22i, 22j can be prevented from decreasing their respective contact areas, and the transmitted rotational torque can be increased.

(2) In the above embodiment, the formation width W of the concave portion of the spacer 23 made of synthetic resin is set to be greater than the formation width t of the engagement protrusions on the first joint member 21 and the second joint member 22 made of metal. Also, the increase in weight can be suppressed as compared with the case where the width of forming the metal member is increased.

The above embodiment may be modified and embodied as follows. The mounting areas of the slits 21c and 22c formed in the first and second joint members 21 and 22 are attached to the mounting holes 21b and 22.
b Only one side in the radial direction.

In place of the slits 21c, 22c, the main bodies 21a, 22a may be divided into two parts, each of which may be fastened and fixed by a pair of bolts. Although not shown, the outer peripheral surface of the spacer 23 is made to protrude from the outer peripheral surfaces of the first and second joint members 21 and 22, or the formed width t is made larger than the formed width w, so that the torque transmitting surface and the torque are reduced. The area with the transmitted surface may be different.

Next, a joint different from the above embodiment will be described with reference to FIGS. This joint 31
It is constituted by a first joint member 32 and a second joint member 32 '. The first joint member 32 includes a thick and short cylindrical main body 32a and the drive shaft 1 formed at the center thereof.
3 and a slit 32c formed in the diameter direction so as to pass through the center axis O1 of the main body 32a. Also, the main body 32a of the first joint member 32 corresponds to the slit 32c in FIG.
As shown in (a), a screw hole 32d is formed, and an insertion hole 32e is formed corresponding to the screw hole 32d.
A step 32f is formed outside 2e. Then, the main body 32a of the first joint member 32 is elastically deformed by screwing the bolt 33 into the screw hole 32d in a state where the drive shaft 13 is inserted into the mounting hole 32b, and is tightened and fixed to the outer peripheral surface of the drive shaft 13. ing.

The second joint member 32 'is formed into a semi-cylindrical first clamp piece 34 and a second clamp piece 35, and the first clamp piece 34 is integrated with the main body 32a of the first joint member 32. It is connected to. First clamp piece 3
A semi-cylindrical clamp surface 34a is formed on the reference numeral 4, and two screw holes 34c are formed on both end surfaces 34b. A semi-cylindrical clamp surface 35a is formed on the second clamp piece 35, and both end surfaces 35b are formed as shown in FIG.
As shown in (2), insertion holes 35c are formed at two places, respectively, and each insertion hole 35c is formed with a step 35d. The driven shaft 15 is connected to the clamp surface 34a.
The second clamp piece 35 is placed on the upper part of the driven shaft 15 in a state where the first clamp piece 35 is in contact with the second clamp piece 35, and the bolt 36 is screwed into the screw hole 34c from the stepped portion 35d and the insertion hole 35c. 34 and the second clamp piece 35 are fastened and fixed.

First, the drive shaft 13 is inserted into the mounting hole 32b of the first joint member 32 so that the bolt 3
3, the main body 32a is fastened and fixed to the drive shaft 13.
Then, the driven shaft 15 is brought into contact with the clamp surface 34a of the first clamp piece 34 with the second clamp piece 35 separated. Next, the second clamp piece 35 is placed on the upper part of the driven shaft 15, and the first clamp piece 34 and the second clamp piece 35 are fixed to the driven shaft 15 by bolts 36.

Therefore, the joint 31 is connected to the driven shaft 15
Can be easily performed from any direction. In the joint in which the second joint member 32 'is also integrally formed like the first joint member 32, the mounting direction of the driven shaft 15 is limited to the direction of the center axis of the drive shaft 13, so that the connecting operation is troublesome. Yes,
If the center axes of the drive shaft 13 and the driven shaft 15 are eccentric, the insertion is not performed smoothly.

The technical idea grasped from the embodiment will be described below. (Technical Thought 1) First Joint Member 32 and Second Joint Member 3
2 ', the first joint member 32 has a cylindrical main body 32a formed integrally, a mounting hole 32b formed in the center thereof, and a slit 32c formed in a part of the main body 32a. The main body 32a is elastically deformed by a bolt 33 and is fastened and fixed to the outer peripheral surface of the drive shaft 13. The second joint member 32 'includes a first clamp piece 34 and a second clamp And a first clamp piece 34 is formed separately from the first clamp piece 34.
The other second clamp piece 35 is integrally connected to the main body 32 a of the joint member 32, and the other second clamp piece 35 is driven by the driven shaft 1 with the driven shaft 15 sandwiched by the bolt 36 toward the first clamp piece 34.
5. A joint which is configured to be fixedly fastened to the outer peripheral surface of the joint 5. (Technical Thought 2) In the technical thought 1, the first joint member 3
2 is formed in a cylindrical shape, and the second joint member 3
The 2 'first clamp piece 34 and the second clamp piece 35 are each formed in a semi-cylindrical shape, and the bolts 33 and 36 are formed to be screwed from the same direction. A joint characterized in that the formation positions of the end faces 34b of the pieces 34 are in the same phase in the circumferential direction.

[0027]

As described above in detail, according to the first to third aspects of the present invention, the rotational torque transmitted from the drive shaft to the driven shaft can be increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an Oldham coupling embodying the present invention.

FIG. 2 is a longitudinal sectional view showing an assembled state of an Oldham coupling.

3A is a sectional view taken along line 1-1 of FIG. 2, FIG. 3B is a sectional view taken along line 2-2 of FIG. 2, FIG. 3C is a sectional view taken along line 3-3 of FIG.
(D) is a sectional view taken along line 4-4 in FIG.

FIG. 4 is an exploded perspective view of a joint.

FIG. 5 is a vertical cross-sectional view of a fitting state of the fitting.

6A is a sectional view taken along line 1-1 of FIG. 5, and FIG. 6B is a sectional view taken along line 2-2 of FIG.

[Explanation of symbols]

t: formed width, w: formed width, 11: Oldham coupling, 15
.., A driven shaft, 21... A first joint member, 21 g... A first engagement convex portion, 21 h... A second engagement convex portion, 21 i, a first torque transmitting surface, 21 j, a second torque transmitting surface, 22. Member, 22g: third engagement projection, 22h: fourth engagement projection, 2
2i: Third torque transmitted surface, 22j: Fourth torque transmitted surface, 23: Spacer, 23c: First engagement concave portion, 23d ...
2nd engagement recessed part, 23e ... 1st torque transmission surface, 23f ...
Second torque transmitting surface, 23g... Third engagement concave portion, 23h.
Fourth engaging concave portion, 23i: third torque transmitting surface, 23j: fourth torque transmitting surface.

Claims (3)

[Claims] 1. A first engagement projection (21g) and a second engagement projection (21g) which are fitted and fixed to a drive shaft (13) and are provided on one side.
h), a first joint member (21) having a third engagement convex portion (22g) and a fourth engagement convex portion (22h) fitted and fixed to the driven shaft (15), on one surface. Second
A coupling member (22) is interposed between the first and second coupling members (21, 22) and engages the first engagement projection (21g) and the second engagement projection (21h). The third engaging concave portion (23) that engages the first engaging concave portion (23c) and the second engaging concave portion (23d) with the third engaging convex portion (22g) and the fourth engaging convex portion (22h).
g) and a spacer (23) having a fourth engagement recess (23h), wherein the first engagement protrusion (21g) and the second engagement protrusion (21)
h) of each of the first torque transmitting surface (21i) and the second torque transmitting surface (21j), and the first and second engaging concave portions (23c) and (23d) of the spacer (23). The first and second torque receiving surfaces (23e) and (23f) have different areas from each other, and the third and fourth engagement recesses (23) of the spacer (23) are different.
g, 23h) of the third and fourth torque transmitting surfaces (23i,
3j) and the third engagement projections (22
g) and an Oldham coupling wherein the respective areas of the third torque transmitting surface (22i) and the fourth torque transmitting surface (22j) of the fourth engagement projection (22h) are different from each other. 2. The method according to claim 1, wherein the first torque transmitting surface (21i) and the second torque transmitting surface (21j) have respective areas of a first engagement recess (23c) and a second engagement recess (23d). ) Are formed smaller than the respective areas of the first torque receiving surface (23e) and the second torque receiving surface (23f), and the third torque receiving surface (22i) and the fourth torque receiving surface (22j). Are Older joints each having a smaller area than each of the third and fourth torque transmitting surfaces (23i, 23j). 3. The first torque transmitting surface (23e) according to claim 2, wherein each of the radially formed widths (t) of the first torque transmitting surface (21i) and the second torque transmitting surface (21j) is equal to the first torque transmitted surface (23e). And each of the third torque receiving surface (22i) and the fourth torque receiving surface (22j) are formed smaller than the respective forming widths (w) of the second and third torque receiving surfaces (23f). The width (t) is determined by the third torque transmitting surface (23i) and the fourth torque transmitting surface (23i).
An Oldham coupling formed to be smaller than each radially formed width (w) of j).