JPH0731524A - Claw coupling - Google Patents

Abstract

PURPOSE:To reduce the number of part items by providing a claw coupling with a rotary member arranged to make contact with a peripheral surface concentric with the center axis of a hinge shaft and a peripheral surface eccentric from the same so as to prevent occurrence of sticking operation. CONSTITUTION:An upper arm 32 is rotatably supported on a hinge shaft 33 through the intermediary of a concentric member 34, and a lower arm 3 is rotatably attached thereto through the intermediary of an eccentric member 35. Rollers 37, 38 are fitted in a cut-out groove 35b formed in the eccentric member 35, and are made into contact with an eccentric peripheral surface 31b and an eccentric peripheral surface 31a of the lower arm 31. In this case, internal teeth 31a of the lower arm 31 and external teeth 32a of the upper arm 32 are pressed against each other so as to be meshed with each other when the rollers 37, 38 make contact with the eccentric peripheral surface 31b. When the hinge 36 is rotated by means of a handle 36, the roller 37 is rotated so as to moderate the contact force between the roller 37 and the eccentric surface, and accordingly, the meshing between the external teeth 32a and the internal teeth 31a are loosened so that the upper arm 32 is further rotated.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meshing joint in which a movable joint rotates with respect to a fixed joint by utilizing a difference in the number of teeth by rotating a hinge shaft, such as a seat reclining mechanism. Used for.

[0003]

2. Description of the Related Art Conventionally, as a joint of this type, DE30
The thing shown by the 13304C publication is known. This has a fixed joint and a movable joint that is rotatably supported on the fixed joint by a hinge shaft and intermeshing with the fixed joint.
This is a meshing joint in which the movable joint is rotated with respect to the fixed joint by utilizing the difference in the number of teeth by rotating the hinge shaft.

In this meshing joint, a pressing member having a wedge surface that is surface-bonded to the inner peripheral surface of the fixed joint is rotatably disposed between the fixed joint and the hinge shaft, and the pressing member is normally provided. Thus, the fixed joint is pressed in the direction in which the fixed joint and the movable joint are firmly meshed with each other, and the clearance at the meshing portion between the movable joint and the fixed joint is reduced, and the looseness between the movable joint and the fixed joint is reduced. The rotation of the hinge shaft causes the pressing member to rotate relative to each other, and the action of the wedge surface releases the connection between the wedge surface and the inner peripheral surface. That is, the pressing of the fixed joint by the pressing member is released. As a result, the engagement between the fixed joint and the movable joint is loosened to increase the clearance at the engagement portion between the movable joint and the fixed joint, thus ensuring a light operation of the hinge shaft.

[0005]

However, in the above-mentioned conventional meshing joint, when the pressing member rotates relative to each other, the wedge surface and the inner peripheral surface are slip-joined to each other. The friction tends to cause the stick operation, which may impair the operation feeling.

Therefore, the present invention has as its technical problem to prevent the occurrence of a stick operation.

[0007]

[Constitution of the invention]

[0008]

The technical means taken in the present invention to solve the above-mentioned technical problem is to provide a circumferential surface centered on the central axis of the hinge shaft and the central axis of the hinge shaft. That is, the rotary member is provided so as to be joined to the eccentric peripheral surface that is eccentric.

[0009]

According to the above-mentioned technical means, the movable joint is always pressed in the direction in which the fixed joint and the movable joint are strongly meshed with each other by joining the positive center peripheral surface and the eccentric peripheral surface of the rotary member. The gap at the meshing part between the fixed joint and the fixed joint is reduced (elimination of the gap), play is prevented from occurring between the movable joint and the fixed joint, and the rotating member is rotated by the rotation operation of the hinge shaft to rotate the eccentric circumference. The change in the joint position with the surface releases the pressure, increasing the clearance at the meshing portion of the movable joint and the fixed joint (having a clearance), and ensuring a light operation of the hinge shaft. That is, the rotating member and the eccentric peripheral surface are rotationally joined, and as a result, the occurrence of the stick operation can be prevented.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a seat back 2 is arranged at the rear of a seat cushion 1 arranged on a vehicle floor (not shown), and the seat back 3 is formed by a seat reclining mechanism 3 which will be described later. It is tiltable with respect to the seat cushion 1.

As shown in FIGS. 2 to 4, in the seat reclining mechanism 3, the lower arm 31 fixed to the seat cushion 1, the upper arm 32 fixed to the seat back 2, and the upper arm 32 are rotated with respect to the lower arm 31. And a hinge shaft 33 that supports it freely.

The upper arm 32 is rotatably attached to the hinge shaft 33 via a centering member 34 which serves as a bearing about the central axis of the hinge shaft 33.
3 is rotatably supported with a predetermined clearance with respect to the eccentric member 35 via an eccentric member 35 that is integral with a hinge shaft 33 that is eccentric with respect to the center axis of the shaft 3. A handle 36 is fixed to the tip of the hinge shaft 33 so as to rotate integrally.

A part of the centering member 34 is fitted in the eccentric member 35 and arranged.

The upper arm 32 has outer teeth 32a centered on the central axis A of the centering member 34, and the lower arm 31 has inner teeth 31a centered on the central axis B of the eccentric member 35. The tooth 32a is at least one tooth less than the inner tooth 31a, and the outer tooth 32a is the inner tooth 3a.
It is meshed so as to be inscribed in 1a.

At the eccentric portion of the eccentric member 35, the eccentric peripheral surface 31b of the lower arm 31 (the supported surface supported by the eccentric outer peripheral surface 35a of the eccentric member 35 which serves as the support surface of the lower arm 32) and the positive center member 34 are aligned. Circumferential surface 34a (eccentric member 35
A notch groove 35b that extends in the circumferential direction and that is open to the outer peripheral surface of the portion that is fitted in is formed. A pair of rollers 37 and 38 are movably and rotatably arranged in the circumferential direction in the notch groove 35b. The rollers 37 and 38 are joined to the eccentric peripheral surface 31b and the positive center peripheral surface 34a of the lower arm 31. is doing. Further, a spring 39 is arranged around the hinge shaft 33, and both ends 39a, 39 of the spring 39 are arranged.
b is locked to the rollers 37 and 38 via long grooves 35c and 35d formed in the eccentric member 35 and extending in the circumferential direction, and the rollers 37 and 38 are biased by the spring 39 so that the eccentric peripheral surface 31b. Is always biased in a direction in which the distance between the eccentric peripheral surface 34a and the eccentric peripheral surface 34a becomes narrower, that is, in a direction in which the eccentric peripheral surface 31b and the eccentric peripheral surface 34a are firmly joined. The rollers 37, 38 are supported by the eccentric member 35 movably and rotatably in the circumferential direction by the engagement of both ends 39a, 39b of the spring 39.

Next, the operation will be described.

The solid lines in FIGS. 2 and 5 show the normal state, and the inner teeth 31a of the lower arm 31 and the outer teeth 3 of the upper arm 32 are shown.
The meshing with 2a is pressed by the strong joining with the eccentric peripheral surface 31b of the rollers 37 and 38, and is made strong without backlash. As a result, the upper arm 32
Rattling in the direction of rotation with respect to the lower arm 31, that is, rattling of the seat back 2 to the seat cushion 1 is prevented, and the seat back 2 is held at a predetermined inclination angle with respect to the seat cushion 1.

In this normal state, when the handle 36 is operated to rotate the hinge shaft 32 in one direction, the eccentric member 35 is rotated together, and the side wall of the cutout groove 35b presses the roller 37 so that the roller 37 is spring 39. Try to move against the urging force of. At this time, due to this pressing force, the frictional force with the circumferential center surface 34a causes the roller 3 to move from the center circumferential surface 34a.
The reaction force acting on the roller 7 is directed toward the center of the roller 37, but the reaction force acting on the roller 37 from the eccentric peripheral surface 31b is a taper surface of the eccentric peripheral surface 31b due to the frictional force with the eccentric peripheral surface 31b. Therefore, the roller 37 does not go to the center of the roller 37 but deviates from the center. As a result, the force in the direction C shown in FIG.
The joint with a is rotated along the elongated hole 35c along the long hole 35c as shown by the one-dot chain line in FIG. 4 to loosen the joint with the eccentric circumferential surface 31b.
Clearance occurs with 1b). At this time, the meshing positions of the outer teeth 32a and the inner teeth 31a are changed by the rotation of the hinge shaft 32, and the eccentric peripheral surface 31b is positioned as shown by the alternate long and short dash line in FIG. Also becomes loose (a clearance is generated between the eccentric peripheral surface 31b). As a result, the eccentric peripheral surface 31b is moved in the radial direction by the amount that the joint with the rollers 37, 38 is loose as shown by the chain double-dashed line in FIG. 5, and the outer teeth 32a and the inner teeth 31a are meshed with each other by a predetermined backlash. It will be loose to exist. As a result, internal teeth 3
The meshing between 2a and the external teeth 31a becomes smooth, and a light operation of the hinge shaft 3 is ensured. After that, when the handle 36 is further operated to rotate the hinge shaft 32 in one direction, the inner teeth 31a and the outer teeth 32a are meshed while inscribed, and as a result, the teeth of the inner teeth 31a and the outer teeth 32a are meshed. The upper arm 32 rotates with respect to the lower arm 31 by a number difference, and the inclination angle of the seat back 2 with respect to the seat cushion 1 is adjusted. Incidentally, when the operation of the handle 36 is stopped, the normal state is established.

The handle 36 is operated to operate the hinge shaft 32.
On the contrary to the above, when the eccentric member 35 is rotated in the other direction, the side wall of the cutout groove 35b presses the roller 38 to move the roller 38 against the urging force of the spring 39. . At this time, due to this pressing, the center-centered circumferential surface 34a
The reaction force acting on the roller 38 from the positive center circumferential surface 34a due to the frictional force toward the roller 38 is directed toward the center of the roller 38, but the eccentric circumferential surface 31
The reaction force that acts on the roller 38 from the eccentric peripheral surface 31b due to the frictional force with b does not move toward the center of the roller 38 but shifts to the center because the eccentric peripheral surface 31b acts like a taper surface.

As a result, the same force as described above acts on the roller 38, and the roller 38 rotates along the elongated hole 35d around the joint portion with the positive center peripheral surface 34a to rotate the eccentric peripheral surface 31.
The joint with b is loosened (the pressure is released due to the change of the joint position, and a clearance is created between the eccentric peripheral surface 31b and the joint is released). At this time, the meshing positions of the outer teeth 32a and the inner teeth 31a are changed by the rotation of the hinge shaft 32, and the eccentric peripheral surface 31b is located in the same manner as described above.
The joint between 7 and the eccentric peripheral surface also loosens (a clearance is generated between the eccentric peripheral surface 31b). As a result, the eccentric peripheral surface 31
b moves in the radial direction as described above, and the outer teeth 32a and the inner teeth 3
The meshing with 1a is loose with a certain backlash. As a result, meshing between the inner teeth 32a and the outer teeth 31a becomes smooth, and a light operation of the hinge shaft 3 is ensured. After that, the handle 36 is further operated to operate the hinge shaft 3.
When 2 is rotated in one direction, the inner teeth 31a and the outer teeth 32a mesh with each other while being inscribed, and as a result, the upper arm 32 rotates relative to the lower arm 31 by the difference in the number of teeth between the inner teeth 31a and the outer teeth 32a. Then, the inclination angle of the seat back 2 with respect to the seat cushion 1 is adjusted in the opposite manner to the above. Incidentally, when the operation of the handle 36 is stopped, the normal state is established.

As described above, since the roller 37 or 38 is rotated and the pressure is released by the rotation operation of the hinge shaft 33, the roller 37 or 38 and the eccentric peripheral surface 31b are not slidably joined. As a result, the occurrence of a stick operation is prevented, and good operation feeling is secured.

Next, a modified embodiment will be described.

In this configuration, coil springs 41 and 42 are used in place of the rollers 37 and 38, and a spring 39 for urging the rollers 37 and 38 is omitted. As shown in FIGS. 6 and 7, the eccentric member 35 is formed with a cutout portion 35e extending in the circumferential direction, and a projection portion that divides the cutout portion 35e into two chambers is formed substantially at the center of the cutout portion 35e. 35f is provided. The coil springs 41 and 42 are respectively arranged in this chamber, and the side walls of the notch 35e, the side walls of the protrusion 35f, and the side walls of the protrusion 35f are urged by the coil springs 41 and 42 themselves.
It is pressed against the eccentric peripheral surface 34a and the eccentric peripheral surface 31b (the coil springs 41 and 42 are naturally larger than the chamber). In such a configuration, when the handle shaft 36 is operated to rotate the hinge shaft 32 in one direction or the other direction, the eccentric member 35 rotates together with the cutout portion 35e.
The side wall presses the coil spring 41 or 42 to move the roller 41 or 42. As a result, the coil spring 41 or 42 rotates in the same manner as the roller 37 or 38 rotates in the above-described embodiment, and as a result, the meshing between the outer teeth 32a and the inner teeth 31a is the same as in the above-described embodiment. There will be a batu krashyu and it will be loose.

As described above, the coil springs 41,
By using 42, the function of the spring 39 can be handled by the coil springs 41 and 42 themselves, so that the spring 39 can be omitted and the number of parts can be reduced.

[0026]

According to the present invention, since the rotary member and the eccentric peripheral surface are rotationally joined to each other, the occurrence of the stick operation can be prevented. Further, by using the coil spring as the rotating member, the number of parts can be reduced and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat equipped with a reclining mechanism that employs a meshing joint according to the present invention.

FIG. 2 is a cross-sectional view of a reclining mechanism that employs a meshing joint according to the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is an operation explanatory view of the meshing joint according to the present invention.

FIG. 6 is a plan view showing a modified example of the meshing joint according to the present invention.

FIG. 7 is an exploded perspective view of FIG.

[Explanation of symbols]

 3 Reclining Mechanism (Mating Joint) 31 Lower Arm (Fixed Joint) 32 Upper Arm (Movable Joint) 33 Hinge Shaft 34a Positive Center Circumferential Surface 31b Eccentric Circumferential Surface 37, 38 Roller (Rotating Member) 41, 42 Coil Spring (Rotating Member)

Claims (2)

[Claims] 1. A fixed joint, and a movable joint that is rotatably supported on the fixed joint by a hinge shaft and meshes with the fixed joint in an inscribed manner, and a difference in the number of teeth is utilized by rotating the hinge shaft. In a meshing joint in which the movable joint rotates with respect to the fixed joint, a eccentric peripheral surface eccentric with respect to a center axis of the hinge shaft and a positive center peripheral surface of the hinge shaft. A meshing joint having a rotating member arranged so as to be joined to the. 2. The meshing joint according to claim 1, wherein the rotating member is a coil spring which is constantly expanded in the radial direction so as to be joined to the positive center peripheral surface and the eccentric peripheral surface.