JPH10275669A - Device relaying between relatively rotating members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a device relaying between relatively rotating members as being capable of installing a relative rotation temporarily locking mechanism therein without requiring a large space in the radial direction, event if the first rotor and the second rotor have small diameters. SOLUTION: A relative rotation temporarily locking mechanism 14 has a locking means 140, a guide wall 141 provided on the first cover 111, a locked recess 122a provided in the second cover 122 and a restraining means 143 to keep a locking protrusion 140a to be fitted to the locked recess 122a against the energizing force of an energizing means 142. The restraining means 143 consists of a locking hole 141b, an elastic strip 144a, a locking pawl 144b and an unlocking protrusion 144c. The unlocking protrusion 144c is thrusted by an outside connector A, when connected to a direct connector 15, to disengage the locking pawl 144b from the locking hole 141b so that the locking protrusion 140a can be removed out of the locked recess 122a with the force of the energizing means 142.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay device between relative rotating members for electrically connecting two relatively rotating members via a cable, and particularly to temporarily fixing the two relatively rotating members. And a relay device between relative rotating members.

[0002]

2. Description of the Related Art As this kind of relay device between relative rotating members, for example, a relay device disclosed in Japanese Patent Application Laid-Open No. 7-282935 is known. In the relay device between relative rotating members disclosed in this publication, a locking means is provided on the first rotating body of the relatively rotating first rotating body and the second rotating body, and the second rotating body is provided with a locking means. A locking recess is provided.

The locking means extends in the radial direction on the first rotating body, and its tip fits into the locking recess located outside the first rotating body, thereby providing the first locking means.
The relative rotation between the rotator and the second rotator is fixed.

The first rotating body is provided with a direct connector, and the locking means is moved by an external connector connected to the direct connector, and the leading end of the locking means is pulled out of the locking recess. And the second rotating body can be relatively rotated.

[0005]

However, in the above-mentioned relay device between relative rotating members, a large space is required in the radial direction because the locking means extends in the radial direction. For this reason, when the first rotating body or the second rotating body is formed of a small diameter, there is a problem that the relative rotation temporary fixing mechanism having the lock means cannot be installed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object the advantage that a large space is not required in the radial direction, and the first and second rotating bodies have a small diameter. Another object of the present invention is to provide a relay device between relative rotating members that can be provided with a relative rotation temporary fixing mechanism.

[0007]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 has a first rotating body and a second rotating body which rotate relatively, and these first rotating body and second rotating body are provided. A relative rotation temporary fixing mechanism which electrically connects the first rotating body side and the second rotating body side via a cable and temporarily stops the relative rotation between the first rotating body and the second rotating body. A relative rotating member relay device provided, wherein the first rotating body includes a first cover body, and the second rotating body is arranged to overlap the first cover body. A second cover body, the first cover body includes a direct connector for connecting a cable to the outside, the relative rotation temporary fixing mechanism includes a lock unit having a lock protrusion at a distal end, The lock projection is provided on the first cover body, and the second projection is provided on the second cover from the first cover body side. A guide wall portion for guiding the locking means so as to be able to protrude toward the body, and the lock protrusion is provided on the second cover body, and the lock protrusion is fitted when the lock protrusion protrudes toward the second cover body. A lock concave portion, a biasing device for biasing the lock device in a direction away from the second cover body, and a state in which the lock convex portion is fitted into the lock concave portion against the biasing force of the biasing device. And a locking means provided in the guide wall portion,
An elastic piece provided on the locking means and extending along the locking hole; and a locking projection provided in the elastic piece and locked in the locking hole, so that the lock convex portion is fitted into the lock concave portion. A locking claw to be maintained, and an unlocking protrusion provided on the elastic piece and protruding from the locking hole to the outside of the guide wall portion. The unlocking protrusion is connected to the direct connector by an external connector. When the connector is connected, the connector is pushed by the external connector, moves toward the inside of the guide wall together with the elastic piece, releases the locking claw from the locking hole, and the locking projection is locked by the force of the urging means. It is characterized by being constituted so that it may escape from.

According to a second aspect of the present invention, in the relay device according to the first aspect, the locking means and the guide wall are provided in the direct connector.

The invention according to claim 3 has a first rotating body and a second rotating body which rotate relatively, and these first rotating body
A rotating body side and a second rotating body side are electrically connected via a cable, and a relative rotation temporary fixing mechanism for temporarily stopping relative rotation between the first rotating body and the second rotating body is provided. The relative rotating member relay device, wherein the first rotating body,
A first cover body, wherein the second rotating body includes the first cover body;
A second cover body disposed so as to overlap with the cover body, and the relative rotation temporary fixing mechanism is provided on the first cover body with a locking means having a lock convex portion at a tip end thereof, and the lock is provided on the first cover body. A guide wall portion for guiding the locking means such that the convex portion can protrude from the first cover body side to the second cover body side; and a guide wall portion provided on the second cover body, wherein the lock convex portion is provided on the second cover body side. A lock recess into which the lock projection fits, a biasing means for biasing the locking means in a direction away from the second cover body, and a biasing force of the biasing means. Restraining means for maintaining the lock convex portion fitted in the lock concave portion, wherein the restraining means is provided in a locking hole provided in the guide wall portion, and in the locking means,
An elastic piece extending along the locking hole, and a locking claw provided on the elastic piece and locking the locking projection in the locking recess by locking the locking projection in the locking hole. An unlocking protrusion provided on the elastic piece and protruding from the locking hole to the outside of the guide wall, the unlocking protrusion connecting the first rotating body to an external connection means. At this time, it is pushed by the same external connecting means, moves together with the elastic piece toward the inside of the guide wall, releases the locking claw from the locking hole, and the lock convex comes out of the lock concave by the force of the urging means. It is characterized by having such a configuration.

[0010] The first aspect of the present invention is configured as described above.
In the invention according to the first aspect, the locking claw is first locked in the locking hole, and the lock projection is projected from the first cover body. When the first rotator and the second rotator are assembled, the lock projection of the locking means is fitted into the lock recess, and the relative rotation between the first rotator and the second rotator is prohibited. State. In this case, the first rotator and the second rotator are assembled at their neutral positions,
It is preferable that the lock protrusion fits into the lock recess.

That is, since the first rotator and the second rotator are connected via a cable,
The relative rotation can be freely performed within a predetermined rotation speed range.
For this reason, for example, in the case of installation at the rotation boundary between the vehicle body side and the steering wheel side of the automobile, the first rotation body and the second rotation body are attached to the rotation boundary while being set at the neutral position. Is preferred.

In any case, if the first rotating body and the second rotating body are locked and the initial condition of relative rotation is set, the first rotating body and the second rotating body can be installed on the steering wheel or other rotating boundary as it is. This eliminates the need to adjust the rotation range while looking at the cable margin.

Further, since the locking means is provided on the first cover body and movably provided on the second cover body side arranged so as to overlap the first cover body,
There is no need to take up a large space in the radial direction. That is,
If there is a small space in the radial direction, a relative rotation temporary fixing mechanism can be installed. Therefore, even if the first rotating body or the second rotating body has a small diameter, the relative rotation temporary fixing mechanism can be attached.

Further, when the first rotating body and the second rotating body are assembled, the lock projection is fitted into the locking recess as it is, and the first rotating body and the second rotating body are locked. In addition, it is possible to save the trouble of locking. Further, simply by fitting the external connector to the direct connector, the locking claw is disengaged from the locking hole, and the locking convex portion is removed from the locking concave portion, so that it is possible to save the trouble of unlocking.

In the invention according to claim 2, since the locking means and the guide wall are provided in the direct connector, the radial space occupied by the relative rotation temporary fixing mechanism can be further reduced. Therefore, even if the first rotating body or the second rotating body has a smaller diameter, the relative rotation temporary fixing mechanism can be attached.

According to the third aspect of the present invention, only by connecting an external connecting means such as a steering wheel to the first rotating body, the locking claw is disengaged from the locking hole, and the lock projection is disengaged from the lock recess. Therefore, the trouble of unlocking can be saved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments with reference to the drawings. 1 to 5 show a first embodiment, and FIGS. 6 and 7 show a second embodiment.

First, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 3 to 5, the relative rotating member relay device 1 according to the first embodiment rotates relative to a fixed body 12 (second rotating body) with respect to the fixed body 12. Rotating body 11 (first rotating body), and the rotating body 11 side and the fixed body 12 side are electrically connected to each other through a flexible flat cable (cable) 13. And a relative rotation temporary fixing mechanism 14 for temporarily fixing the relative rotation between the motor and the fixed body 12.

The rotating body 11 includes an inner cylinder 110 and the inner cylinder 1.
And a top plate (first cover body) 111 that extends radially outward from the upper end of the top 10 in a circular shape. The inner cylinder 110 and the top plate 111 are connected by screws 16.

The fixed body 12 includes a bottom plate 121 extending radially outward from the lower end of the inner cylinder 110 in a circular shape, an outer cylinder 120 extending upward from an outer peripheral portion of the bottom plate 121, and an upper cylinder 121 extending from the upper end of the outer cylinder 120. Reaching the vicinity of the inner cylinder 110, the top plate 11
1 is provided with a lower top plate (second cover body) 122 located so as to overlap the lower side of the first top plate 1. Lower top plate 122 and outer cylinder 12
0 is the locking member 1 integrally formed on the lower top plate 122.
22b and a locked member 120a formed on the outer cylinder 120
Thus, they are detachably connected.
The flexible flat cable 13 is disposed in an annular space formed between the inner cylinder 110 and the outer cylinder 120.

One end 13a of the flexible flat cable 13 enters the inner cylinder 110, and each lead wire is connected to each connection pin 150 of the direct connector 15 provided on the top plate 111, and the other end 13b Is the outer cylinder 12
0 is connected to the outside via a connector (not shown) or the like.

Then, the inner cylinder 110 is accommodated in the outer cylinder 120 on the bottom plate 121 together with the flexible flat cable 13 in a state where the one end portion 13a of the flexible flat cable 13 is accommodated. On this, the lower top plate 122
And the locking member 122b is engaged with the locked member 120a. The inner cylinder 110 has its upper end and lower end
1 and the lower top plate 122, and slides without falling off at this portion. The flexible flat cable 13 taken out from the inner cylinder 110 is connected to the connection pins 15 of the direct connector 15 on the top plate 111.
The inner cylinder 110 is fixed to the top plate 111 with screws 16.

As shown in FIGS. 1 to 3, the direct connector 15 is adapted to be connected to the external connector A, and surrounds the connection pin 150 so as to surround the connection pin 150. Are formed integrally with the top plate 111.

As shown in FIG. 4, the connector wall 151 is arranged such that the inner side surface 151a and the outer side surface 151b are oriented in a direction perpendicular to a straight line extending in the radial direction from the center of the top plate 111. Then, the connector wall 15
In FIG. 1, a relative rotation temporary fixing mechanism 14 is provided on one end side of the inner side surface 151a and the outer side surface 151b.

The relative rotation temporary fixing mechanism 14 is shown in FIGS.
As shown in FIG. 3, a lock means 140 having a lock protrusion 140a formed in a columnar shape at the tip and a top plate 111 of the rotating body 11 are provided, and the lock protrusion 140a is formed from the first cover body 111 side. A guide wall 141 for guiding the locking means 140 so as to be able to protrude toward the second cover body 122;
The lock projection 1 is provided on the lower top plate 122 of the fixed body 12.
When the projection 40a protrudes toward the lower top plate 122, a lock recess 122a into which the lock projection 140a fits, and a coil spring (biasing means) for urging the locking means 140 in a direction away from the lower top plate 122 ) 142 and the lock projection 1 against the spring force (biasing force) of the coil spring 142.
And a restraining means 143 for maintaining the state of fitting 40a into the locking recess 122a.

The guide wall 141 is formed in a quadrangular cylindrical shape, and a locking hole 141b described later is formed on one side surface 141a. In addition, the top plate 111 has a lock projection 1.
A through hole 111a through which 40a passes is formed.

The restraining means 143 includes a locking hole 141b provided on one side surface 141a of the guide wall 141, an elastic piece 144a provided on the locking means 140 and extending along the locking hole 141b, and an elastic piece 144a. A locking claw 144b is provided on the piece 144 and is locked to the upper edge of the locking hole 141b to maintain the lock projection 140a in a state of being fitted into the lock recess 122a. An unlocking protrusion 144c protruding from the stopper hole 141b to the outside of one side surface 141a of the guide wall portion 141 is provided.

The elastic piece 144a is formed by a wall on the free end side of a U-shaped elastic wall 144. That is, one end of the elastic wall 144 is connected and fixed to the lock projection 140a, and the other end is a free end. The wall on the free end side is the elastic piece 14.
4a.

The unlocking projection 144c is formed of an elastic piece 144.
a is provided at the free end side tip of
When the external connector A is connected to the direct connector 15, the external connector A is pushed by the external connector A and moves toward the inside of one side surface 141 a of the guide wall 141 together with the elastic piece 144 a, and the locking claw 144 b is locked in the locking hole. The lock projection 140a is removed from the lock recess 122a by the force of the coil spring 142. The unlocking projection 144c has an inclined surface on which the external connector A contacts, and is smoothly moved to the inside of the one side surface 141a by the contact of the external connector A.

The range of relative rotation between the rotating body 11 and the fixed body 12 is finite depending on the length of the flexible flat cable 13. Therefore, in a state where the rotating body 11 is in the neutral position where the rotating body 11 rotates in the same range on both the left and right sides with respect to the fixed body 12, the circumferential direction of the locking recess 122a is adjusted so that the locking recess 140a enters the locking recess 122a. The position has been set.

The top plate 111 is integrally formed of a synthetic resin together with the direct connector 15 and the guide wall 141. In this embodiment, the inner cylinder 110 and the top plate 111 are configured to be separable. However, the inner cylinder 110 and the top plate 111 may be integrally formed of the same synthetic resin.

Further, the lower top plate 122 is detachable from the outer cylinder 120, and is fixed to the outer cylinder 120 after the flexible flat cable 13 is placed on the bottom plate 121. I have. However, the lower top plate 122
May be integrally formed of a synthetic resin together with the outer cylinder 120 and the bottom plate 121. In this case,
Fixing body 1 with flexible flat cable 13 from inside
2 will be inserted.

In the relay device 1 between relative rotating members constructed as described above, first, the locking claws 144b are
1b so that the lock projection 140a projects outward from the through hole 111a of the top plate 111. When the rotating body 11 is assembled so as to be at a neutral position with respect to the fixed body 12, the lock projection 140a is
22a, and the relative rotation between the rotating body 11 and the fixed body 12 is prohibited. That is, the rotating body 11 and the fixed body 12 are locked to each other.

Then, for example, in a state where the steering of the automobile is set to the neutral position, the fixed body 12 is connected to the steering column on the vehicle body side, the rotating body 11 is connected to the steering wheel, and the other end of the flexible flat cable 13 is connected. One end of the flexible flat cable 13 is connected to the wiring on the steering wheel side via the direct connector 15 and the external connector A via a connector or the like.

External connector A is connected to direct connector 15
When the external connector A is connected, the unlocking projection 144c moves toward the inside of the one side surface 141a by the external connector A, and the locking claw 144b comes off the locking hole 141b. For this reason, the lock projection 140a comes out of the lock recess 122a, and the rotating body 11 can freely rotate with respect to the fixed body 12. When the lock is released, the rotating body 11
Is already set at the neutral position, so that it is possible to save the trouble of setting the neutral position while looking at the allowance of the flexible flat cable 13.

Also, since the locking means 140 is provided on the top plate 111 and the locking means 140 is movable in the direction in which the top plate 111 and the lower top plate 122 overlap, the top plate 111 and the lower top plate 122 are movable. Even if the space in the radial direction of the plate 122 is small, the locking means 140 can be installed. That is, if there is a small space in the radial direction, the relative rotation temporary fixing mechanism 14 can be installed. Therefore, even if the rotating body 11 or the fixed body 12 has a small diameter, the relative rotation temporary fixing mechanism 14 can be attached.

In addition, the locking means 140 and the guide wall 1
Since the 41 is provided in the direct connector 15, the radial space occupied by the relative rotation temporary fixing mechanism 14 can be further reduced. Therefore, even if the rotating body 11 or the fixed body 12 has a smaller diameter, the relative rotation temporary fixing mechanism 14 can be attached.

Further, when the rotating body 11 and the fixed body 12 are assembled, the lock projection 140a is directly
Since the rotating body 11 and the fixed body 12 are locked into the locked state, the trouble of setting the locked state can be omitted. Further, just by fitting the external connector A to the direct connector 15, the locking claw 144b is turned into the locking hole 141b.
, And the lock projection 140a comes off from the lock recess 122a, so that the trouble of unlocking can be saved.

Next, a second embodiment of the present invention will be described with reference to FIGS. However, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 5 and 6, the relative rotation temporary fixing mechanism 14 is a direct connector 15 shown in the first embodiment.
It is provided at a different position. That is, the guide wall portion 141 is provided independently on the top plate 111, and the locking means 140 is disposed in the guide wall portion 141.

When the rotating body 11 is connected to the steering wheel (external connecting means) 2, the unlocking convex portion 144 c is pushed by the steering wheel 2, and together with the elastic piece 144 a, one side surface of the guide wall 141. 141a, and moves the locking claw 144b into the locking hole 141b.
From the coil spring 14
With the force of 2, the lock recess 122a is pulled out.

The steering wheel 2 has a steering shaft 20 penetrating through the inner cylinder 110 and a steering boss 21 provided around the steering shaft 20. A locking projection 21 a formed on the steering boss 21 is unlocked. The projection 144c is pressed.

The top plate 111 is connected to the guide wall portion 14.
1 together with a synthetic resin.

In the relay device 1 between the relative rotating members configured as described above, the lock projection 140a can be pulled out of the lock recess 122b only by connecting the steering wheel 2 to the rotating body 11. Therefore, it is possible to save the trouble of unlocking. Others
The same operation and effect as those of the first embodiment can be obtained.

In the above embodiments, the rotating body 11 is shown as the first rotating body and the fixed body 12 is shown as the second rotating body.
The second rotating body may be the rotating body 11, the fixed body 12 may be provided with the direct connector 15, the guide wall 141, the locking means 140, and the like, and the rotating body 11 may be provided with the locking recess 122 a.

Although the lock recess 122a is formed with a bottom, it may be penetrated in the thickness direction.

[0047]

According to the first aspect of the present invention, first, the locking claw is locked in the locking hole so that the lock projection is projected from the first cover body. When the first rotator and the second rotator are assembled, the lock projection of the locking means is fitted into the lock recess, and the relative rotation between the first rotator and the second rotator is prohibited. State. In this case, the first
It is preferable that the rotator and the second rotator are assembled at the neutral position so that the lock projection fits into the lock recess.

That is, since the first rotating body and the second rotating body are connected via the cable,
The relative rotation can be freely performed within a predetermined rotation speed range.
For this reason, for example, in the case of installation at the rotation boundary between the vehicle body side and the steering wheel side of the automobile, the first rotation body and the second rotation body are attached to the rotation boundary while being set at the neutral position. Is preferred.

In any case, if the first rotating body and the second rotating body are locked and the initial condition of relative rotation is set, the first rotating body and the second rotating body can be installed on the steering wheel or other rotating boundary as it is. This eliminates the need to adjust the rotation range while looking at the cable margin.

Further, since the locking means is provided on the first cover body and movably provided on the second cover body side arranged so as to overlap with the first cover body,
There is no need to take up a large space in the radial direction. That is,
If there is a small space in the radial direction, a relative rotation temporary fixing mechanism can be installed. Therefore, even if the first rotating body or the second rotating body has a small diameter, the relative rotation temporary fixing mechanism can be attached.

Further, when the first rotating body and the second rotating body are assembled, the lock projection is fitted into the locking recess as it is, and the first rotating body and the second rotating body are locked. In addition, it is possible to save the trouble of locking. Further, simply by fitting the external connector to the direct connector, the locking claw is disengaged from the locking hole, and the locking convex portion is removed from the locking concave portion, so that it is possible to save the trouble of unlocking.

In the invention according to claim 2, since the locking means and the guide wall are provided in the direct connector, the radial space occupied by the relative rotation temporary fixing mechanism can be further reduced. Therefore, even if the first rotating body or the second rotating body has a smaller diameter, the relative rotation temporary fixing mechanism can be attached.

According to the third aspect of the present invention, only by connecting an external connecting means such as a steering wheel to the first rotating body, the locking claw is disengaged from the locking hole, and the lock projection is disengaged from the lock recess. Therefore, the trouble of unlocking can be saved.

[Brief description of the drawings]

FIG. 1 is a view of a relay device between relative rotating members shown as a first embodiment of the present invention, and is a cross-sectional view taken along line II of FIG. 4;

FIG. 2 is a view of the relay device between the relative rotating members, and FIG.
Sectional drawing which follows the II line.

FIG. 3 is a perspective view of the relay device between the relative rotating members.

FIG. 4 is a plan view of the relay device between relative rotating members.

FIG. 5 is an exploded perspective view of the relay device between relative rotating members.

FIG. 6 is a plan view of a main part of a relay device between relative rotating members shown as a second embodiment of the present invention.

7 is a diagram of the relay device between the relative rotating members, and FIG.
Sectional drawing which follows the VII-VII line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Relay device between relative rotation members 11 1st rotating body 111 1st cover body (top plate) 12 2nd rotating body 122 2nd cover body (lower top board) 122a Lock recess 13 Cable (flexible flat) Cable) 14 relative rotation temporary fixing mechanism 140 locking means 140a locking projection 141 guide wall 141b locking hole 142 urging means (coil spring) 143 restraining means 144a elastic piece 144b locking claw 144c unlocking projection 15 direct connector 2 External connection means (steering wheel) A External connector

Claims (3)

[Claims] A first rotating body that relatively rotates;
The first rotating body side and the second rotating body side are electrically connected via a cable, and the relative rotation between the first rotating body and the second rotating body. It is a relative rotation member relay device provided with a relative rotation temporary fixing mechanism for temporarily stopping rotation, wherein the first rotating body includes a first cover body, and the second rotating body includes the first rotating body. A first cover body disposed so as to overlap with the first cover body, the first cover body includes a direct connector for connecting a cable to the outside, and the relative rotation temporary fixing mechanism includes a distal end portion. A lock means having a lock convex portion, and a guide wall portion provided on the first cover body for guiding the lock means so that the lock convex portion can protrude from the first cover body side to the second cover body side. And the lock projection is provided on the second cover body, and A lock recess into which the lock protrusion fits when protruding toward the cover body; a biasing means for biasing the locking means in a direction away from the second cover body; and a biasing force of the biasing means. Restraining means for maintaining the lock convex portion fitted in the lock concave portion, wherein the restraining means is provided in a locking hole provided in a guide wall portion, and provided in the locking means, and wherein the locking hole is provided. An elastic piece extending along the elastic piece; a locking claw provided on the elastic piece, for locking the locking convex portion in the locking concave portion by being locked in the locking hole; And an unlocking protrusion projecting from the locking hole to the outside of the guide wall portion.The unlocking protrusion is connected to the external connector when the external connector is connected to the direct connector. Pressed,
The relative movement is characterized in that it moves toward the inside of the guide wall together with the elastic piece, releases the locking claw from the locking hole, and allows the lock projection to come out of the lock recess by the force of the urging means. A relay device between rotating members. 2. The relay device according to claim 1, wherein the locking means and the guide wall are provided in the direct connector. 3. A first rotating body that rotates relatively, and a second rotating body that rotates relatively.
The first rotating body side and the second rotating body side are electrically connected via a cable, and the relative rotation between the first rotating body and the second rotating body. It is a relative rotation member relay device provided with a relative rotation temporary fixing mechanism for temporarily stopping rotation, wherein the first rotating body includes a first cover body, and the second rotating body includes the first rotating body. A second cover body disposed so as to overlap the first cover body, wherein the relative rotation temporary fixing mechanism is provided on the first cover body with a locking means having a lock convex portion at a distal end thereof, A guide wall for guiding the locking means so that the lock projection can protrude from the first cover body toward the second cover body; and a guide wall provided on the second cover body, wherein the lock projection is a second cover. When projecting to the body side, the lock concave portion into which the lock convex portion fits, and the lock means A biasing means for urging in a direction away from the cover body, and a restraining means for maintaining the lock convex portion fitted in the lock concave portion against the biasing force of the biasing means; The means is a locking hole provided in the guide wall portion, an elastic piece provided in the locking means and extending along the locking hole, and an elastic piece (provided in the elastic piece and locked in the locking hole). A locking claw for maintaining the lock convex portion fitted in the lock concave portion, and a lock release convex portion provided on the elastic piece and protruding outside the guide wall portion from the locking hole. When the first rotating body is connected to the external connecting means, the lock releasing convex part is pushed by the external connecting means, moves together with the elastic piece toward the inside of the guide wall, and is locked. Remove the claw from the locking hole, so that the lock projection comes out of the lock recess by the force of the biasing means. A relay device between relative rotating members, wherein the relay device is configured.