JP2007236664A - Reclining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device which has a first member provided at one of a seat cushion and a seat back, a second member which is provided at the other thereof and is provided at a first member so that rotation may be allowed relative to the first member and in which an internal tooth is formed on the circumference of a circle around the rotation center of the relative rotation, a pole which is arranged between the first member and the second member and has an outer tooth which can be engaged with the internal tooth of the second member, and a guide which is provided at the first member and guides the pole in the radial direction of the circumference of the circle, and forbids/permits the relative rotation of the first member and the second member when the outer tooth of the pole is engaged with/disengaged from the internal tooth of the second member and in which an abnormal sound is not generated when load pushing a seat back backward acts on the seat back. <P>SOLUTION: A plurality of first grooves 140c extending in a direction crossing the width direction of the tooth of the outer tooth 144 of the pole 140 are formed in the opposing face in guide projections 105 and 106 of the pole 140. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides the first member provided on one of the seat cushion and the seat back, and the other member provided on the other of the seat cushion and the seat back so as to be rotatable relative to the first member. A second member having an inner tooth formed on a circumference around the rotation center of the relative rotation, and disposed between the first member and the second member; A pole having external teeth meshable with internal teeth of two members, and a guide provided on the first member for guiding the pole in a radial direction of the circumference, wherein the external teeth of the pole The present invention relates to a reclining device that prohibits / permits relative rotation between the first member and the second member by engaging / disengaging with an internal tooth of a second member.

  A conventional reclining device will be described with reference to FIGS. 9 is an exploded perspective view of the reclining device, FIG. 10 is a plan view of the pole in FIG. 9, FIG. 11 is a perspective view of the pole in FIG. 9, and FIG. 12 shows the external teeth of the pole when the reclining device in FIG. It is a figure explaining meshing with the internal teeth of an upper arm.

  In FIG. 9, a hinge pin 3 is provided on a lower arm (first member) 1 provided on the seat cushion side. An upper arm (second member) 5 provided on the seat back side is rotatably attached to the hinge pin 3. Accordingly, the lower arm 1 and the upper arm 5 are rotatable relative to each other. The upper arm 5 is formed with internal teeth on the circumference around the rotation center of the relative rotation. Specifically, as shown in FIG. 12, internal teeth 5 b are formed on the inner peripheral wall surface of the recess 5 a formed in the upper arm 5.

  Between the lower arm 1 and the upper arm 5, a pole 7 in which outer teeth 7 a that can mesh with the inner teeth of the upper arm 5 is formed. The lower arm 1 is formed with a guide 9 for guiding the pole 7 in the radial direction of the circumference.

  The hinge pin 3 rotates in one direction to press the back portion of the pole 7, and by pressing the cam 11, the external teeth of the pole mesh with the internal teeth of the upper arm 5, and a lever 13 that drives the cam 11. Is provided. Further, the cam 11 is formed with a hook portion 11 a that can be engaged with the projection 7 f formed on the side portion of the pole 7. As the cam 11 rotates in the other direction, the hook portion 11a of the cam 11 engages with the protrusion 7f of the pole 7, and the external teeth 7a move the pole 7 away from the internal teeth of the upper arm 5. ing.

  Then, the lever 13 rotates and biases the cam 11 in one direction by a spring 17 locked at one end to the lever 13 and locked at the other end to the pin 15 provided on the lower arm 1 to make the pole 7 It is designed to press the back of the.

  Further, as shown in FIGS. 10, 11 and 12, the surface of the pole 7 on which the external teeth 7a are formed is formed with a protruding portion 7b that protrudes further from the tooth tip of the external teeth 7a. As shown in FIG. 11, the projecting portion 7 b enters a space between the upper arm 5 and the lower arm 1 when the outer teeth 7 a of the pole 7 mesh with the inner teeth 5 b of the upper arm 5. Further, a groove 7c in the direction of the tooth width of the external teeth 7a of the pole 7 of the pole 7 (the thickness direction of the pole 7) is formed on the surface of the pole 7 facing the guide 9 (side surface of the pole 7). . This groove 7c functions as a grease reservoir.

  The operation of the above configuration will be described. Normally, the cam 11 is rotationally biased in one direction by the biasing force of the spring 17 and presses the back portion of the pole 7, and the outer teeth 7 a of the pole 7 mesh with the inner teeth of the upper arm 5, and the lower arm 1 and the upper arm Relative rotation with 5 is prohibited (locked state).

Here, when the lever 13 is operated against the urging force of the spring 17, the cam 11 rotates in the other direction, and the pole 7 moves in a direction in which the outer teeth 7 a are separated from the inner teeth of the upper arm 5. Then, the engagement between the outer teeth 7a of the pole 7 and the inner teeth of the upper arm 5 is released, and relative rotation between the lower arm 1 and the upper arm 5 is permitted (unlocked state) (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-149832 (FIGS. 1, 4, and 5)

  However, in the reclining device shown in FIGS. 9 to 11, when a load that pushes the seat back backward acts on the seat back, the load is transmitted from the seat back of the seat to the seat cushion. More specifically, the load is applied to the seat cushion side having the guide 9 for guiding the pole 7 from the inner teeth 5b of the upper arm 5 on the seat back side through the poles 7 having the outer teeth 7a meshing with the inner teeth 5b. It is transmitted to the lower arm 1.

  In particular, the surface of the pole 7 facing the inner teeth 5b of the upper arm 5 of the reclining device shown in FIGS. 9 to 11 is composed of outer teeth 7a meshing with the inner teeth 5b and overhanging protrusions 7b. That is, the thickness of the surface of the pole 7 facing the inner teeth 5 b of the upper arm 5 is thicker than the width of the inner teeth 5 b of the upper arm 5. For this reason, when the load acts on the upper arm 5, it acts as an eccentric load on the pole 7, and the pole 7 is covered in the arrow A direction.

  The pole 7 shown in FIGS. 9 to 12 has an overhanging portion 7 b that enters the space between the upper arm 5 and the lower arm 1, but there is always a gap between the overhanging portion 7 b and the upper arm 5 and the lower arm 1. So Paul 7 is heated.

  On the other hand, a groove 7c in the plate thickness direction of the pole 7 is formed on the surface of the pole 7 facing the guide 9 so that the pole 7 moves smoothly in the radial direction of the inner teeth 5b. However, as shown in FIG. 13, the direction of the groove 7 c is the plate thickness direction of the pole 7.

  When the reclining device is not locked or unlocked for a long time, a portion where grease is present (a portion of the groove 7c) and a portion where no grease is present (a portion other than the groove 7c) between the side surface of the pole 7 and the guide 9 ) Occurs. That is, a portion where grease is present and a portion where grease is broken are formed in a stripe shape.

Therefore, when the pole 7 is covered in the direction of the arrow A, if there is a grease-cut portion between the surface of the pole 7 where the groove 7c is provided and the guide 9, there is a problem that abnormal noise is generated.
This invention is made | formed in view of the said problem, The subject is providing the reclining apparatus which does not generate | occur | produce abnormal noise, when the load which pushes a seat back back acts on a seat back.

  The invention according to claim 1 is provided on one of the seat cushion and the seat back, and on the other of the seat cushion and the seat back, and is rotatable relative to the first member. The second member is provided on the first member and has a second member formed with internal teeth on a circumference around the rotation center of the relative rotation, and is disposed between the first member and the second member. A pole having external teeth that can mesh with the internal teeth of the second member, and a guide provided on the first member for guiding the pole in a radial direction of the circumference, In a reclining device that prohibits / permits relative rotation between the first member and the second member by engaging and disengaging external teeth with the internal teeth of the second member, the surface of the pole facing the guide, the guide Of the surface facing the pole On one side even without a reclining apparatus characterized by forming a plurality of first grooves extending in a direction intersecting the direction of the tooth width of the external teeth of the pole.

  According to a second aspect of the present invention, at least one of the facing surface of the pole facing the guide and the facing surface of the guide facing the pole, the direction of the tooth width of the external teeth of the pole and the first The reclining device according to claim 1, wherein a second groove intersecting with the direction of the groove is formed.

  According to the first and second aspects of the present invention, the width of the external teeth of the pole on at least one of the surface of the pole facing the guide and the surface of the guide facing the pole. By forming a plurality of first grooves extending in a direction intersecting with the direction, the load that pushes the seat back backward acts on the seat back, and when the pole is raised, the teeth of the external teeth of the pole The grease of the plurality of first grooves extending in the direction intersecting the width direction is applied over a wide range to prevent the generation of abnormal noise.

  According to the invention according to claim 2, the direction of the tooth width of the external teeth of the pole and the surface of at least one of the facing surface of the pole facing the guide and the facing surface of the guide with the pole By forming the second groove that intersects the direction of the first groove, the amount of grease applied increases, and the generation of abnormal noise decreases.

  An embodiment (manual type) of the present invention will be described with reference to FIGS. First, as shown in FIG. 4, in the reclining device of this embodiment, a base plate 100 as a second disk member is attached to the lower arm 201 on the seat cushion side, and a ratchet as a first disk member is attached to the upper arm 202 on the seat back side. A plate 130 is attached.

  As shown in FIG. 3 to FIG. 6, by fitting a disc-shaped ratchet plate (second member) 130 to a disc-shaped base plate (first member) 100, both can be rotated relative to each other. It is piled up. The reclining unit 90 is completed by providing an angle adjusting mechanism (described later) for adjusting the relative rotation angle between the base plate 100 and the ratchet plate 130 between the base plate 100 and the ratchet plate 130.

  The cylindrical mounting bracket 205 wraps the base plate 100 and the ratchet plate 130 from the outside, and prohibits the ratchet plate 130 from separating from the base plate 100. Specifically, one end of the mounting bracket 205 is locked to the outer peripheral portion of the base plate 100, and the ratchet plate holding portion 205a on the other end side presses the ratchet plate 130 from the rotation center axis direction.

  A hole 101 and a hole 131 are formed at positions on the rotation center axis of the base plate 100 and the ratchet plate 130, and the operation shaft 120 is inserted into the hole 101 and the hole 131. As shown in FIGS. 4 and 6, a circular recess 132 centering on the operation shaft 120 is formed on the surface of the ratchet plate 130 facing the base plate 100, and the inner peripheral wall surface of the recess 132 has an inner wall. Teeth 133 are engraved.

  As shown in FIGS. 4 and 6, a recess 104 is formed on the surface of the base plate 100 facing the recess 132 of the ratchet plate 130, and as shown in FIG. A pair of guide projections 105, 106 and a pair of guide projections 107, 108 project toward the plate 130.

  In this embodiment, the base plate 100 is manufactured by using forging, and in this case, the guide protrusions 105, 106 are formed so that no recess is formed on the back side of the guide protrusions 105, 106, 107, and 108 on the base plate 100. , 107 and 108 are formed in a solid shape, and the thickness of the peripheral portion thereof is made sufficiently large to increase the strength of the guide protrusions 105, 106, 107 and 108.

  On the surface of the base plate 100 opposite to the ratchet plate 130 side (the outer surface of the base plate 100), a plurality of protrusions 100a are equidistantly arranged on the same circumference around the hole 101 (coaxial with the rotation center axis O). It is arranged. A plurality of protrusions 130 a are also arranged at equal intervals on the same circumference around the hole 131 on the surface of the ratchet plate 130 opposite to the base plate 100 (the outer surface of the ratchet plate 130).

  The pole 140 has outer teeth 141 on the front end surface side that can be engaged and disengaged from the radial direction of the tip circle on the inner teeth 133 of the ratchet plate 130. As shown in FIG. 7, the guide surfaces of the guide protrusions 105 and 106 105a and 106a are slidably guided in the direction orthogonal to the rotation center axis of the ratchet plate 130, that is, in the radial direction of the tip circle of the internal teeth 133.

  The pole 150 has the same shape as the pole 140, is sandwiched between the guide surfaces 107a and 108a of the guide protrusions 107 and 108, is slidably guided in the radial direction of the tip circle of the inner tooth 133, and is on the front end surface side. The outer teeth 151 can be engaged with the inner teeth 133 of the ratchet plate 130.

  A cam 170 that can rotate together with the operation shaft 120 is disposed in the space on the rear end surfaces 146 and 156 side of the poles 140 and 150. That is, as shown in FIG. 4, a cross-sectional oval portion 123 is formed in the intermediate portion of the operation shaft 120, and this cross-sectional oval portion 123 is fitted in the oval hole 171 of the cam 170. As a result, the operation shaft 120 and the cam 170 are fitted in a state where relative rotation is impossible, and the cam 170 rotates together with the operation shaft 120.

The poles 140 and 150 and the cam 170 are formed to have the same thickness and are disposed on the same plane of the base plate 100. The cam 170 has an inclined cam surface 174b for pressing the rear end surfaces 146 and 156 of the poles 140 and 150 when the cam 170 rotates to mesh the outer teeth 141 and 151 of the poles 140 and 150 with the inner teeth 133 of the ratchet plate 130. , 175b. In order to perform this function, the inclined cam surfaces 174b and 175b are inclined in the inclined direction when the cam 170 rotates in the locked rotation direction.
5b and the rear end surfaces 146 and 156 of the poles 140 and 150 are set in a direction away from the rotation center axis O of the cam 170. For example, as shown for the inclined cam surface 175b in FIG. It becomes a straight line.

  Further, the cam 170 is positioned on the front side in the rotation direction when the cam 170 is locked (counterclockwise in FIG. 8) with respect to the inclined cam surfaces 174b and 175b, and the external teeth 141 and 151 of the poles 140 and 150 and the ratchet. When meshing with the internal teeth 133 of the plate 130, support surfaces 174a and 175a are provided at the ends of the rear end surfaces 146 and 156 of the poles 140 and 150 (front portions in the rotation direction when the cam 170 is locked) via a gap. ing. When the counterclockwise load in FIG. 8 is applied from the ratchet plate 130 to the poles 140 and 150 from the ratchet plate 130, the support surfaces 174a and 175a abut against the ends of the rear end surfaces 146 and 156 of the poles 140 and 150. And further tilting of the poles 140 and 150 is prohibited.

  Further, the cam 170 is located on the rear side in the rotation direction when the cam 170 is locked with respect to the inclined cam surfaces 174b and 175b, and between the outer teeth 141 and 151 of the poles 140 and 150 and the inner teeth 133 of the ratchet plate 130. Support surfaces 174c and 175c are provided so as to face the end portions of the rear end surfaces 146 and 156 of the poles 140 and 150 (the rear side portion in the rotation direction when the cam 170 is locked) when engaged. When the clockwise load in FIG. 8 is applied from the ratchet plate 130 to the poles 140 and 150 from the ratchet plate 130, the support surfaces 174c and 175c abut against the end portions of the rear end surfaces 146 and 156 of the poles 140 and 150. It supports and prohibits further tilting of the poles 140 and 150.

  Cam grooves 144 and 154 are formed on the surface of the poles 140 and 150 on the ratchet plate 130 side (in this embodiment, the cam grooves 144 and 154 are holes penetrating to the surface on the base plate 100 side). . The release plate 180 constituting the release means is arranged so that one surface thereof overlaps with the poles 140 and 150 and the cam 170 and the other surface is in sliding contact with the ratchet plate 130. A hole 181 through which the operation shaft 120 is inserted is formed in the central portion of the release plate 180.

  As shown in FIGS. 7 and 8, the cam 170 has protrusions 176 and 177 protruding toward the ratchet plate 130, and these protrusions 176 and 177 are formed at the edge of the hole 181 of the release plate 180. It is fitted in small slots 182 and 183 extending in the radial direction. For this reason, the cam 170 and the release plate 180 rotate in conjunction with each other.

  Further, as shown in FIGS. 4 and 7, projections 183 and 184 that engage with the cam grooves 144 and 154 are formed on the rotating end portion of the release plate 180 by press molding or the like. The cam grooves 144 and 154 are shaped so that when the release plate 180 rotates in the clockwise direction in FIG. 7, the pawls 140 and 150 are moved toward the rotation center side of the cam 170 by the interaction between the cam grooves 144 and 154 and the protrusions 183 and 184. It is set to move forcibly.

  As shown in FIGS. 7 and 8, spiral springs 191 and 195 as urging means have inner ends hooked to hooks 111 and 112 of the base plate 100 and outer ends hooked to step portions 178 and 179 of the cam 170. The cam 170 is rotated and biased so that the cam 170 pushes the rear end surfaces 146 and 156 of the poles 140 and 150.

  Further, as shown in FIG. 4, the thickness of the pole 140 is set to a thickness that faces the bottom surface of the concave portion 132 of the ratchet plate 130, the release plate 180, and the bottom surface of the concave portion 104 of the base plate 100 with a slight gap. The ratchet plate 130 does not move in the direction of the rotation center axis. Therefore, as shown in FIG. 4, the external teeth 141 of the pole 140 have a portion that does not mesh with the internal teeth 133 of the ratchet plate 130 in the tooth width direction.

  In the present embodiment, as shown in FIG. 1, a plurality of surfaces extending in the direction intersecting the direction of the tooth width of the external teeth 144 of the pole 140 are formed on the facing surfaces 140 a and 140 b of the pole 140 facing the guide protrusions 105 and 106. A first groove 140c was formed. Further, a second groove 140d intersecting the direction of the first groove 140c and the direction of the tooth width of the external tooth 144 of the pole 140 is formed, and the first groove 140c and the second groove 140d are formed as a grease reservoir. did.

Similarly, a first groove and a second groove similar to those of the pole 140 are formed in the pole 150.
The operation of the reclining device having the above configuration will be described. In the locked state, the urging force of the spiral springs 191 and 195 causes the cam 170 to push the rear end surfaces 146 and 156 of the poles 140 and 150, and the external teeth 141 and 151 of the poles 140 and 150 mesh with the internal teeth 133 of the ratchet plate 130. In this state, the rotation of the ratchet plate (seat back) 130 is prohibited.

  The movement at the time of shifting to the locked state will be described. The cam 170 that receives the urging force of the spiral springs 191 and 195 is a direction in which the external teeth 141 and 151 of the poles 140 and 150 mesh with the internal teeth 133 of the ratchet plate 130. Rotate first. Accordingly, the inclined cam surfaces 174b and 175b of the cam 170 press the rear end surfaces 146 and 156 of the poles 140 and 150, and the outer teeth 141 and 151 of the poles 140 and 150 mesh with the inner teeth 133 of the ratchet plate 130. Move in the radial direction.

  In a locked state in which the external teeth 151 of the pawl 150 and the internal teeth 133 of the ratchet plate 130 are engaged, when a load is applied from the ratchet plate 130 to the pawl 150 due to a vehicle collision or the like, the pawl 150 has an inclined cam surface 175b of the cam 170 and It will be supported by the support surfaces 175a and 175c.

  When the operation shaft 120 is rotated clockwise in FIG. 8 against the biasing force of the spiral springs 191 and 195 in the locked state, and the cam 170 is also rotated clockwise, the rear end surfaces of the poles 140 and 150 of the cam 170 are rotated. 146 and 156 are released, the projections 183 and 184 of the release plate 180 are in sliding contact with the inclined wall surfaces of the cam grooves 144 and 154 of the poles 140 and 150, and the external teeth 141 and 151 of the poles 140 and 150 are ratchet. The poles 140 and 150 retreat in a direction away from the inner teeth 133 of the plate 130, the meshing between the outer teeth 141 and 151 of the poles 140 and 150 and the inner teeth 133 of the ratchet plate 130 is released, and the ratchet plate (seat back) 130 can be tilted (unlocked state).

  When the seat back is tilted to a desired angle and the operation force to the operation shaft 120 is released, the cam 170 pushes the rear end surfaces 146 and 156 of the poles 140 and 150 by the urging force of the spiral springs 191 and 195, The 150 external teeth 141 and 151 mesh with the internal teeth 133 of the ratchet plate 130 again to return to a state where the rotation of the ratchet plate (seat back) 130 is prohibited.

According to the configuration of such an embodiment, the following effects can be obtained.
(1) By forming a plurality of first grooves 140c extending in the direction intersecting the direction of the tooth width of the external teeth 144 of the pole 140 on the facing surfaces 140a, 140b of the pole 140 facing the guide protrusions 105, 106, When a load that pushes the seat back backward acts on the seat back and the pole 140 is covered, the grease of the plurality of first grooves 140c extending in the direction intersecting the tooth width direction of the external teeth 144 of the pole 140 Is applied over a wide area to prevent abnormal noise.
(2) When the plurality of second grooves 140d intersecting the first groove 140c are formed on the opposing surfaces 140a and 140b of the pole 140 facing the guide protrusions 105 and 106, when the pole 140 is covered, The amount of grease applied is increased and the generation of abnormal noise is reduced.
(3) Since the first groove similar to the pole 140 is formed in the pole 150, a load that pushes the seat back backward acts on the seat back, and when the pole 150 is covered, A plurality of first groove greases extending in a direction intersecting the direction of the tooth width of the external teeth 154 are applied over a wide range, thereby preventing the generation of abnormal noise. Further, since the second groove similar to the pole 140 is formed, when the pole 150 is covered, the amount of grease applied is increased, and the generation of abnormal noise is reduced.

  The present invention is not limited to the above embodiment. Although the first groove and the second groove are formed on the surface of the poles 140 and 150 facing the guide protrusion, conversely, the groove may be formed on the surface of the guide protrusion facing the poles 140 and 150, A first groove and a second groove may be formed on both surfaces.

It is a figure explaining the invention part of the example of the form of the present invention, and is a perspective view of a pole. It is a figure which shows the upper arm in the example of a form of this invention. It is a front view of the reclining unit in the example of the present invention. FIG. 4 is a cross-sectional view taken along a cutting line CC in FIG. 3 with an upper arm and a lower arm added. It is a rear view of the reclining unit shown in FIG. FIG. 4 is a cross-sectional view taken along a cutting line DD in FIG. 3. It is sectional drawing in the cutting line EE of FIG. FIG. 8 is a diagram in which the release plate of FIG. 7 is removed. It is a disassembled perspective view of the conventional reclining apparatus. FIG. 10 is a plan view of the pole of FIG. 9. FIG. 10 is a perspective view of the pole of FIG. 9. It is a figure explaining the meshing | engagement of the external tooth of a pole at the time of attaching the reclining apparatus of FIG. 9 and the internal tooth of an upper arm. It is a figure explaining a problem.

Explanation of symbols

105, 106 Guide protrusion (guide)
140 pole 140c first groove 140d second groove

Claims (2)

A first member provided on one of the seat cushion and the seat back;
Provided on the other of the seat cushion and the seat back, provided on the first member so as to be relatively rotatable with respect to the first member, and on the circumference around the rotation center of the relative rotation, A second member formed with teeth;
A pole disposed between the first member and the second member and having external teeth capable of meshing with the internal teeth of the second member;
A guide provided on the first member for guiding the pole in a radial direction of the circumference, and the outer teeth of the pole engage and disengage with the inner teeth of the second member; In a reclining device that prohibits / permits relative rotation with the second member,
A plurality of first grooves extending in a direction intersecting the direction of the width of the external teeth of the pole on at least one of the face of the pole facing the guide and the face of the guide facing the pole A reclining device characterized by forming   At least one of the surface of the pole facing the guide and the surface of the guide facing the pole intersects the width direction of the external teeth of the pole and the direction of the first groove. The reclining device according to claim 1, wherein a second groove is formed.

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