JP2012011999A - Reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining device capable of securing lock strength, even when strong impact is applied.SOLUTION: This reclining device includes a base plate 10 fixed to either one of a seat cushion or a seat back, a gear plate 20 rotatably assembled to the base plate 10 and having inner teeth, fixing guides 30 formed in the base plate 10, lock gears 40 sliding between the fixing guides 30 and having outer teeth capable of being engaged with the inner teeth of the gear plate 20, movable guides 50 interposed between the lock gears 40 and the fixing guides 30, a cam 60 for engaging the lock gears 40 with the gear plate 20, a link plate 80 rotating simultaneously with the cam 60 to release engagement of the lock gears 40 and the movable guides 50, and a torsion spring 90 for rotating and energizing the movable guides 50. In the reclining device, groove parts 51 are provided in contact face parts with the fixing guides 30 in the movable guides 50.

Description

The present invention relates to a reclining device that adjusts the angle of a seat back of a vehicle seat.

Conventionally, as a vehicle reclining device for a vehicle seat, for example, a “reclining device” described in Patent Document 1 has been proposed.
The reclining device includes a disk-shaped machine frame, a lid that rotates along an inner peripheral surface of the machine frame, a plurality of lock gears arranged in the machine frame via a guide, a machine frame and a lid, An operation shaft and a cam-like plate that prevent mutual rotation, a release plate that is driven by the cam-like plate, and a lock mechanism that frees mutual rotation of the machine frame and the lid, and includes a plurality of lock gears. The one lock gear is divided in the radial direction, a substantially valley-shaped cam surface that is inclined toward the divided surface is formed, and a wedge member is disposed between the cam surface and the cam-like plate, so that the cam When the lock plate is rotated and the lock gear is moved outward, the wedge member is pressed against the cam surface of the divided lock gear, the lock gear expands to the left and right, and the left and right sides of the lock gear are A structure that prevents backlash in the circumferential direction of the lid by pressing against the inner surface. It has become.

JP 2002-101999 A

In the structure of the reclining device shown above, when the cam plate is rotated and the lock gear is operated outward, the lock gear is divided to prevent backlash, but the lock gear is divided. Therefore, there is a risk that the lock strength of the reclining device that normally operates may decrease. In addition, when a strong impact is applied to the reclining device due to a vehicle collision or the like, it is considered that the strength of the reclining device is insufficient.
The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a reclining device capable of ensuring the lock strength even when a strong impact is applied to the reclining device.

In order to solve the above-described problems, a reclining device of the present invention includes a base plate that is fixed to either a seat cushion or a seat back, a gear plate that is rotatably assembled to the base plate and has internal teeth, and a base plate A fixed guide formed on the lock plate, a lock gear having external teeth that can slide between the fixed guides and mesh with the internal teeth of the gear plate, a movable guide that is slidably interposed between the lock gear and the fixed guide, A cam that controls the movement in the direction of the outside of the mold and meshes the lock gear with the internal teeth of the gear plate, a link plate that rotates simultaneously with the cam and releases the mesh of the lock gear and the movable guide with the internal teeth of the gear plate, and a movable guide Provided with a torsion spring that is engaged with the cam and urges the movable guide inward of the base plate. , The surface-contacting portion of the movable guide of the fixed guide, and technical features providing a groove.

  According to the reclining device of the first aspect, when an impact is applied, the outer end portion of the fixed guide is press-fitted into the groove portion of the movable guide to restrict the operation of the movable guide, thereby increasing the strength of the reclining device. . In addition, during normal use, since the lock gear and the fixed guide are tightly fitted on the radially outer side of the movable guide, play can be prevented.

It is a figure which shows a reclining apparatus. (a) It is sectional drawing of BB in FIG. b, (b) It is sectional drawing of AA in FIG. It is a figure which shows the disassembled perspective view of a reclining apparatus. It is a figure which shows the groove part provided in a movable guide.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the reclining device 100 according to the present embodiment includes a base plate 10 fixed to a seat cushion or a seat back, and is rotatably assembled to the base plate 10 and either the seat cushion or the seat back. A lock gear 40 having a circular gear plate 20 fixed to the inner plate, a fixed guide 30 formed on the base plate 10, and an external tooth that slides between the fixed guides 30 and can mesh with the internal teeth of the gear plate 20. A movable guide 50 slidably interposed between the lock gear 40 and the fixed guide 30, and a cam 60 that controls the movement of the lock gear 40 in the outward direction and meshes the lock gear 40 with the internal teeth of the gear plate 20. And simultaneously with the cam 60, it controls the movement of the lock gear 40 in the radially inward direction. A center shaft 70 for releasing the engagement with the internal teeth of the gear plate 20, a link plate 80 that rotates when releasing the engagement of the lock gear 40 with the internal teeth of the gear plate 20 and pulls the lock gear 40 inward, and a movable guide 50. And a cam 60 are provided with a torsion spring 90.

  The base plate 10 constitutes a base of the reclining device 100 and is fixed to a seat cushion or a seat back of a vehicle seat. The base plate 10 has a circular outer shape by pressing a steel plate, and forms a fixed guide 30 described later.

  The gear plate 20 is rotatably assembled to the base plate 10 and is fixed to either the seat cushion or the seat back (the base plate is not fixed) of the vehicle seat. The gear plate 20 forms internal teeth on the inner periphery opposite to the surface fixed to the seat cushion or the seat back. The internal teeth can mesh with external teeth formed on the lock gear 40, which will be described later, and lock the tilt of the seat back in the front-rear direction by the engagement of the lock gear 40.

  The fixed guide 30 is formed in a substantially triangular shape at four locations on the base plate 10 and sandwiches four lock gears 40 described later. The fixed guide 30 is configured to protrude by extruding a die when the base plate 10 is formed by pressing a steel plate, and by setting the mechanical strength lower than that of the movable guide 50 described later, When a large impact is applied to the reclining device 100 due to an accident or the like, the outer end portion is pressed into the groove portion of the movable guide 50 due to deformation.

  The lock gear 40 is formed such that a side surface in contact with the fixed guide 30 and a side surface in contact with a movable guide 50 described later are formed in parallel so that the lock gear 40 can slide between the fixed guides 30 formed at four locations of the base plate 10. The outer teeth are formed on one side connecting the two to enable engagement with the inner teeth of the gear plate 20. The lock gear 40 is formed by pressing a steel plate, and includes a protrusion that can be joined to a link plate 80 described later.

The movable guide 50 is formed in a wedge shape so that the width gradually decreases from one end to the other end, and is slidably interposed between the fixed guide 30 and the lock gear 40. 90 is engaged, and is biased inward of the base plate 10 by the torsion spring 90. With this configuration, the movable guide 50 is always in a state of being bitten between the fixed guide 30 and the lock gear 40, and the fixed guide 30, the lock gear 40, and the movable guide 50 are firmly joined to each other, so The gap in disappears. Therefore, the backlash in the front-rear direction of the seat back is eliminated. Here, the movable guide 50 is set to have higher mechanical strength than the fixed guide 30 of the base plate 10 by being configured by quenching after pressing the steel plate into a wedge shape.
In addition, the movable guide 50 has a groove 51 at a contact surface with the base plate 20. The groove 51 engages the torsion spring 90, and when a large impact is applied to the reclining device 100 due to a vehicle accident or the like, the outer end of the fixed guide 30 is press-fitted to restrict the operation of the movable guide 50. it can.

  The cam 60 is disposed at a substantially central position of the base plate 20, is inserted through a center shaft 70 described later, and rotates simultaneously with the center shaft 70 to control the movement (sliding) of the lock gear 40. That is, the rotation of the cam 60 engages and releases the lock gear 40 with respect to the gear plate 20, and eventually locks and releases the tilting of the seat back on which the reclining device 100 is mounted. In addition, the cam 60 is provided with a protrusion so as to make a square hole through which the prism portion of the center shaft 70 can be inserted and to be able to be joined to a link plate 80 described later.

  The center shaft 70 (not shown) is inserted through through holes formed in the center portions of the base plate 10 and the gear plate 20, and coaxially supports the base plate 10 and the gear plate 20. Further, the center shaft 70 is mounted with an operation lever (not shown) as a separate member, and is inserted between the base plate 10 and the gear plate 20 when an occupant manually operates the operation lever. When the cam 60 and the link plate 80 rotate simultaneously, the lock gear 40 is engaged with and released from the gear plate 20. Further, in the vicinity of a substantially middle portion of the center shaft 70, a rectangular column portion that can be inserted into a square hole formed in the cam 60 and the link plate 80 is provided. An operation lever can be attached to one end of the center shaft 70, and a serration that can be connected to a connection shaft (not shown) is formed at the other end.

The link plate 80 rotates simultaneously with the cam 60 to push the movable guide 50 outward when the cam 60 rotates to release the engagement of the lock gear 40 with the internal teeth of the gear plate 20. In the present invention, the fixed guide 30, the lock gear 40, and the movable guide 50 are in tight contact with each other, and the lock gear 40 is fixed to the fixed guide simply by rotating the cam 60 to unlock the tilt of the seat back. In some cases, the lock gear 40 may not be released from meshing with the gear plate 20 because the lock gear 40 is fixed between the movable guide 50 and the movable guide 50. Therefore, when the lock gear 40 is pulled inward in the base plate 20, the lock guide 40 is slid freely by releasing the movable guide 50 from the movable guide 50 by releasing the lock guide 40 outward. Further, the link plate 80 is formed by forming a square hole through which the shaft prism can be inserted at a circular center position constituted by a thin wall and an elongated hole through which the protrusion of the lock gear 40 can be inserted. In addition, a long hole that can be inserted into the protrusion of the movable guide 50 is formed.

  The torsion spring 90 is engaged with a movable guide 50 interposed between the fixed guide 30 and the lock gear 40 and biases the movable guide 50 so as to draw it inward of the base plate 20. 90 is expanded to engage one engaging portion with the movable guide 50 and the other with the cam 60. By engaging in this way, the torsion spring 90 generates an urging force and pulls the movable guide 50 and the cam 60 toward each other.

10 base plate 20 gear plate 30 fixed guide 40 lock gear 50 movable guide 51 groove 60 cam 70 center shaft 80 link plate 90 torsion spring 100 reclining device

Claims (1)

A base plate fixed to either the seat cushion or the seat back;
A gear plate rotatably assembled to the base plate and having internal teeth;
A fixed guide formed on the base plate;
A lock gear having external teeth that can slide between the fixed guides and mesh with the internal teeth of the gear plate;
A movable guide slidably interposed between the lock gear and the fixed guide;
A cam for controlling the movement of the lock gear in the out-of-shape direction and meshing the lock gear with the internal teeth of the gear plate;
A link plate that rotates simultaneously with the cam and releases the engagement between the lock gear and the movable guide with respect to the internal teeth of the gear plate;
A vehicle seat reclining device comprising a torsion spring that is engaged with the movable guide and the cam to urge the movable guide inwardly of the base plate,
A reclining device, wherein a groove portion is provided in a surface of the movable guide that contacts the fixed guide.

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