JP2012011165A - Reclining device - Google Patents

Abstract

An object of the present invention is to provide a reclining device capable of holding a lock even when a strong impact is applied to the reclining device.
In a reclining device, four lock gears that slide between fixed guides formed on a base plate are composed of upper and lower lock gears and left and right lock gears, one of which is a main lock gear and the other is a sub-lock gear. 42, the main lock gear 41 meshes with the internal teeth of the gear plate when the cam 50 of the lock gear 40 rotates, and the sub-lock gear 42 does not mesh with the internal teeth of the gear plate 20 even when the cam 50 rotates. A space is provided between the sub-lock gear 41 and the cam 50.
[Selection] Figure 2

Description

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

Conventionally, as a vehicle reclining device for a vehicle seat, for example, a “reclining device” described in Patent Document 1 has been proposed.
In this reclining device, a disc attached to the seat cushion side of a vehicle seat and a movable disc attached to the seat back side are rotatably supported, and a support shaft is inserted in the center of the disc and the movable disc. A lock mechanism is disposed between the movable disks. This locking mechanism is composed of four slide poles that mesh with and release the ratchet of the movable disk, and an operating plate that rotates integrally with the support shaft and presses each slide pole inward, and is attached to the outside of the support shaft. When the occupant operates the operating lever, the slide poles and the ratchet are engaged and released.

Japanese Patent No. 3804431

The locking mechanism of the reclining device shown above is configured to mesh and release the four slide poles with the ratchet, and can have high meshing strength, but when a strong impact is applied to the reclining device due to a vehicle accident or the like, The slide pole may come off and the locking strength of the reclining device may be reduced.
The present invention has been made to solve the above-described problems, and provides a reclining device that can maintain the locking strength of the reclining device even when a strong impact is applied to the reclining device due to a vehicle accident or the like. For the purpose.

  In order to solve the above-described problems, a reclining device of the present invention is formed on a base plate fixed to either a seat cushion or a seat back, a gear plate rotatably assembled to the base plate and having internal teeth, and a base plate A fixed guide, four lock gears having external teeth that can slide between the fixed guides and mesh with the internal teeth of the gear plate, and the movement of the lock gear in the outward direction is controlled. The vehicle seat reclining device includes a cam that meshes with the teeth, and a center shaft that simultaneously rotates with the cam to control movement of the lock gear in the radial direction and releases meshing with the internal teeth of the gear plate. The four lock gears are composed of upper and lower lock gears and left and right lock gears. One of the left and right lock gears is a main lock gear, and the other is a sub-lock gear. The main lock gear meshes with the internal teeth of the gear plate when the cam rotates during normal operation, and the sub-lock gear rotates the cam during normal operation. However, a technical feature is that a space is provided between the sub-lock gear and the cam so as not to mesh with the internal teeth of the gear plate.

  According to the reclining device of the first aspect, when a strong impact is applied to the reclining device due to a vehicle accident or the like, the gear block is deformed so that the sub-lock gear meshes with the internal teeth of the gear plate, resulting in a stronger impact than before. The lock can be held even if added.

It is a figure which shows the reclining apparatus which concerns on this invention. (a) It is sectional drawing of BB in FIG. b, (b) It is sectional drawing of AA in FIG. 1 shows a schematic view of a reclining device according to the present invention. (a) It is sectional drawing of DD in FIG. b, (b) It is sectional drawing of CC in FIG. It is a figure which shows operation | movement of the lock gear of the reclining apparatus before and after an impact is added. (a) It is a figure before an impact is added, (b) The figure after an impact is shown is shown.

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 a circular gear plate 20 that is rotatably assembled to the base plate 10 and has internal teeth. , A fixed guide 30 formed on the base plate 10, a lock gear 40 having external teeth that slide between the fixed guides 30 and can mesh with the internal teeth of the gear plate 20, and the movement of the lock gear 40 in the outward direction. The cam 50 that controls and engages the lock gear 40 with the internal teeth of the gear plate 20, and the cam 50 rotates simultaneously with the cam 50 to control the movement of the lock gear 40 in the radially inward direction, thereby engaging the internal teeth of the gear plate 20. When the engagement of the center shaft 60 to be released and the lock gear 40 to the internal teeth of the gear plate 20 is released, And it includes a link plate 70 to draw the lock gear 40 inward, the torsion spring 80 to pull the engaged cam 50 and the fixed guide 30 to the fixed guide 30.

  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. Further, a through hole through which a center shaft 60 described later is inserted is formed at the center of the base plate 10 and is rotatably assembled with the gear plate 20 described later.

  The gear plate 20 is rotatably attached to the base plate 10 and is fixed to either the seat cushion or the seat back of the vehicle seat (the base plate 10 is not fixed). 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. Further, a through hole through which a center shaft 60 described later is inserted is formed in the center portion of the gear plate 20.

  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 be protruded by extruding a mold when the base plate 10 is formed by pressing a steel plate.

  The lock gear 40 has both side surfaces in contact with the fixed guide 30 formed in parallel so that the lock gear 40 can slide between the fixed guides 30 formed at the four locations of the base plate 10 and external teeth are formed on one side connecting both surfaces. Thus, it is possible to engage with the inner teeth of the gear plate 20. The lock gear is formed by pressing a steel plate, and includes a protruding portion that can be joined to a link plate 70 described later.

Here, the lock gear 40 is divided into a main lock gear 41 and a sub-lock gear 42. In FIG. 1, the lock gear 40 arranged up and down is a main lock gear 41, and the lock gear 40 arranged on the left and right is a sub-lock gear 42. Further, in FIG. 1, the main lock gear 41 and the sub-lock gear 42 can be replaced with the lock gear 40 arranged on the left and right as the main lock gear 41 and the lock gear 40 arranged on the top and bottom as the sub-lock gear 42, respectively. Here, the main lock gear 41 is a lock gear 40 that is used when performing a reclining operation, and meshes with and releases the internal teeth of the gear plate 20 when a cam 50 described later rotates. The sub-lock gear 42 has a structure in which a space is provided between the main lock gear 41 and the cam 50 when the main lock gear 41 is locked, and the length between the cam 50 and the gear plate 20 is shorter than that of the main lock gear 41. Is set. This is because the gear plate 20 is deformed when an impact is applied to the reclining device 100 due to a vehicle collision or the like, and the inner teeth of the gear plate 20 are connected by the four lock gears 40 of the outer teeth of the sub-lock gear 42 and the outer teeth of the main lock gear 41. This is for meshing.

  The cam 50 is disposed substantially at the center position of the base plate 10, is inserted through a center shaft 60 described later, and rotates simultaneously with the center shaft 60 to control the movement of the lock gear 40. In other words, the rotation of the cam 50 causes the lock gear 40 to mesh with and release from the gear plate 20, and as a result, to lock and release the tilt in the front-rear direction of the seat back on which the reclining device 100 is mounted. In addition, the cam 50 is provided with two protrusions so as to make a square hole through which the prismatic part of the center shaft 60 can be inserted and to be able to be joined to the link plate 70.

  The center shaft 60 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 60 is provided 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 50 and the link plate 70 are rotated at the same time, the engagement of the lock gear 40 with the gear plate 20 and the release thereof are performed. Further, in the vicinity of a substantially middle portion of the center shaft 60, a rectangular column portion that can be inserted into a square hole formed in the cam 50 and the link plate 70 is provided. An operation lever can be attached to one end of the center shaft 60, and a serration that can be connected to a connection shaft (not shown) is formed at the other end.

The link plate 70 rotates simultaneously with the cam 50 and pulls the lock gear 40 inward when the cam 50 rotates to release the engagement of the lock gear 40 with the internal teeth of the gear plate 20. The link plate 70 is formed by drilling a square hole through which the shaft prismatic part can be inserted at a circular center position constituted by thin corrugations and an elongated hole through which the protrusion of the lock gear 40 can be inserted. is there.

  The torsion spring 80 is engaged with the cam 50 and the fixed guide, and pulls the cam 50 and the fixed guide 30 across the center shaft 60 in a diagonal line. The cam 50 is urged to rotate by the torsion spring 80.

  Next, the operation of the reclining device 100 according to the present embodiment will be described.

  In the reclining device 100, when locking the tilting of the seat back in the front-rear direction, the occupant opens the operation lever. When the operation lever is released, the cam 50 urged clockwise by the torsion spring 80 rotates, and the main gear 41 of the lock gear 40 is slid so as to be pushed outward along the fixed guide 30 in the base plate 10. Thus, the outer teeth of the main gear 41 mesh with the inner teeth of the inner periphery of the gear plate 20, and the tilting of the seat back in the front-rear direction is locked. Here, the sub-lock gear 42 does not mesh with the internal teeth of the gear plate 20 even when the main lock gear 41 is in a locked state.

  On the other hand, when unlocking the tilting of the seat back in the front-rear direction, the occupant pulls up (or pushes down) the operation lever. When the operation lever is rotated, the center shaft 60 on which the operation lever is mounted rotates counterclockwise, and the cam 50 and the link plate 70 through which the center shaft 60 is inserted rotate at the same time. The rotation of the cam 50 may cause a space between the cam 50 and the main gear 41 of the lock gear 40. However, when the outer edge of the long hole in the link plate 70 comes into contact with the protruding portion of the main lock gear 41 of the lock gear 40 and the main lock gear 41 is smoothly pulled inward, the space is filled. When the main lock gear 41 is pulled inward, the seat back can be tilted in the front-rear direction. Here, the sub-lock gear 42 does not mesh with the internal teeth of the gear plate 20 even when the main lock gear 41 is in a locked state.

  Next, when an impact is applied to the reclining device 100 due to a vehicle accident or the like, the gear plate 20 provided in the reclining device 100 of the present invention has a length in the vertical direction (in the direction of the main lock gear 40) as shown in FIG. The space between the sub-lock gear 41 and the cam 50 is filled, and the internal teeth of the gear plate 20 and the external teeth of the sub-lock gear 41 mesh with each other. In addition, the lock can be held even when a stronger impact is applied than in the prior art.

10 base plate 20 gear plate 30 fixed guide 40 lock gear 41 main lock gear 42 sub-lock gear 50 cam 60 center shaft 70 link plate 80 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;
Four lock gears having outer teeth that slide between the fixed guides and mesh with the inner teeth of the gear plate;
A cam for controlling the movement of the lock gear in an out-of-shape direction and meshing the lock gear with the internal teeth of the gear plate;
A reclining device for a vehicle seat comprising a center shaft that simultaneously rotates with the cam to control the movement of the lock gear in the radially inward direction and releases engagement with the internal teeth of the gear plate,
The four lock gears are composed of upper and lower lock gears and left and right lock gears,
One of the upper and lower lock gears and the left and right lock gears is a main lock gear, the other is a sub-lock gear,
The main lock gear meshes with the internal teeth of the gear plate by rotating the cam during normal operation,
The reclining device is characterized in that a space is provided between the sub-lock gear and the cam so that the sub-lock gear does not mesh with the internal teeth of the gear plate even if the cam rotates during normal operation.

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