JPH0937880A - Internal tooth type reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deformation and damage to a guide side wall by sharing and receiving impact force transmitted from a rotary arm to an inner tooth by the guide side wall and a locking gear part. SOLUTION: The inner teeth 12A and 12B are guided by the guide side walls 8a and 8b of the recessed part of a base member 1 and respectively slid outward and an external gear formed at the tip part is respectively engaged to the internal gear of the rotary arm 2 and the locking gear parts 11a and 11b of the base member 1. In a lock state, the side wall parts of the inner teeth 12A and 12B are engaged with the guide side walls 8a and 8b of the recessed part 10 of the base member 1 and the external gear is engaged with the engaging gear parts 11a and 11b of the recessed part of the base member 1. For instance, the impact force transmitted through the rotary arm 2 to the inner teeth 12A and 12B by a collision accident is divided and received by the guide sidewalls 8a and 8b and the engaging gear parts 11a and 11b of the base member 1. Thus, since surface pressure received on the guide side walls 8a and 8b is reduced to a half, the guide side walls are surely prevented from being deformed and demaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal tooth type reclining device for tilting a seat back with respect to a seat cushion, and more specifically, a base member fixed to the seat cushion and a rotation member for the base member. A pivoting arm movably supported and fixed to the seat back;
A sliding engagement portion that is guided forward and backward by a recess side wall formed in the base member and interposed between the base member and the rotating arm and has a tooth portion at the tip, and the sliding engagement portion. An internal-tooth recliner that includes at least a rotatable cam that moves between a locking position that meshes with internal teeth formed on the rotary arm and a spaced position that separates from the internal teeth, and a lever that rotates the cam. Regarding the device.

[0002]

2. Description of the Related Art As a conventional internal tooth type reclining device, for example, there is one described in JP-A-6-125821.

In this conventional example, a cup-shaped recess is formed in a fixed flange, and a block having teeth formed on the outer peripheral edge side is disposed in the cup-shaped recess so as to be slidable in the radial direction. By disposing a block pressure member on the inside and sliding the block pressure member in the radial direction by a cam, the teeth of the block are formed on a movable flange rotatably arranged with respect to the fixed flange. The backrest portion of the seat is configured to be tilted to a desired tilt angle position by engaging with or separating from the teeth.

[0004]

However, in the above-mentioned conventional internal tooth type reclining device, since the block and the block pressure member are guided in the radial direction by the groove formed in the cup-shaped concave portion of the fixed flange. When a large impact force that rotates the backrest part to the rear side is applied in the tilt lock state in which the outer teeth of the block are meshed with the inner teeth of the movable flange by the cam via the block pressure member, Since the outer teeth mesh with the inner teeth of the movable flange, the large turning force transmitted to the movable flange is directly transmitted to the block, and this block collides with the guide side wall of the cup-shaped recess. It is said that the surface pressure of the guide side wall becomes high and the guide side wall is deformed or damaged and the reclining function is impaired. Resolution there was a problem.

In order to solve this unsolved problem, the mechanical strength of the guide side wall portion of the fixing flange may be increased. For that purpose, the thickness of the guide side wall portion is increased or the mechanical strength is large and the cost is high. Inevitably, it is not a good idea when the weight reduction and cost reduction of the vehicle are required like today.

Therefore, the present invention has been made by paying attention to the unsolved problem of the above-mentioned conventional example, and increases the mechanical strength without changing the thickness and the material of the guide side wall portion, resulting in an excessive impact force. The object of the present invention is to provide an internal tooth type reclining device that can avoid damage when transmitted.

[0007]

In order to achieve the above object, an internal tooth type reclining device according to the present invention includes a base member fixed to a seat cushion and a seat rotatably supported by the base member. Sliding lock in which a rotating arm fixed to the back and a recess side wall formed between the base member and the rotating member and formed in the base member are guided so as to be able to move forward and backward and a tooth portion is formed at a tip end thereof. Members,
A rotatable cam that moves the sliding engagement member between an engagement position that meshes with internal teeth formed on the rotation arm and a separation position that is separated from the internal teeth, and an operation lever that rotates the cam. In the internal tooth type reclining device including at least, the tooth portion meshes with a wall surface facing the tooth portion of the sliding locking member connected between the side walls guiding the sliding locking member of the recess of the base member. It is characterized in that a locking tooth portion is formed.

In the present invention, the sliding lever is moved by operating the operating lever to rotate the cam, and the tooth portion formed at the tip of the sliding engaging member meshes with the internal teeth of the rotating arm. In the locked state, the teeth of the sliding lock member mesh with the locking teeth of the base member in addition to the internal teeth of the rotary arm, and the sliding lock member moves from the rotary arm side. When an excessive impact force is transmitted, the impact force can be divided and received by the guide side wall in the recess of the base member and the engaging tooth portion, and the surface pressure of the guide side wall is reduced, so that the guide side wall is reduced. The deformation and damage can be reliably prevented without increasing the mechanical strength of the.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An internal tooth type reclining device according to the present invention will be described below with reference to the drawings. 1 and 2 are a front view showing an embodiment of the present invention and its A-.
FIG. 3 is a cross-sectional view taken along line A, in which a pivot arm 2 attached to a seat back (not shown) is fixed to a base cushion 1 which is fixed to a seat cushion (not shown). It is rotatably held around the center.

As shown in FIGS. 2 to 4, the base member 1 has a mounting portion 6 fixed to the frame of the seat cushion.
a and 6b, and a pair of left and right guide side walls 8a and 8b in which an insertion hole 7 for inserting the pivot shaft 4 is formed in the central portion, and these guide side walls 8
arcuate side walls 9a connected to the upper and lower ends of a and 8b,
9b and a recess 10 formed in a substantially rectangular shape.

Here, arcuate side walls 9a and 9b of the recess 10 are formed.
Further, engaging tooth portions 11a and 11b that mesh with outer teeth of inner teeth 12A and 12B described later are formed.

In the recess 10, a pair of upper and lower inner teeth 12A, 12B as slide locking members are arranged by the guide side walls 8a, 8b so as to be movable back and forth in the radial direction. Outer teeth 13 are formed on the outer peripheral side of each of the inner teeth 12A and 12B, and a cam surface 14 is formed on the inner peripheral side thereof.

Here, the cam surface 14 has projecting engaging portions 14a and 14b projecting inward, and these projecting engaging portions 14a and 14a.
14b, the engaging recesses 14c and 14d are connected to the clockwise side and extend outward.

Further, the inner tooth 12A of the recess 10 is
A cam 16 that fits into the width across flats formed on the pivot 4 and is rotated is disposed between the portions 12B. This cam 16
On the surface facing each inner tooth 12A, 12B,
A cam surface having projecting engaging portions 16a, 16b engaging with the outward projecting engaging portions 14a, 14b and engaging concave portions 16c, 16d extending inwardly connected to the projecting engaging portions 16a, 16b is formed. Has been done.

The rotating arm 2 has mounting holes 18a and 18b for mounting on the seat back at the upper end side, and an arcuate side wall 9 of the recess 10 of the base member 1 at the lower end side.
A cylindrical recess 19 having the same radius as that of a and 9b is formed. An insertion hole 20 for inserting the pivot shaft 4 of the operation lever 3 described above is formed in the center of the cylindrical recess 19 and upper and lower side walls are formed. Inner tooth 1 mentioned above over a certain range
Internal teeth 21a, 21b meshing with external teeth 13 of 2A, 12B
Are formed.

Further, as shown in FIG. 3, the operation lever 3 is inserted from the outside of the rotating arm 2 into the insertion hole 20, the cam 16 and the insertion hole 7 of the base member 1 from the base member 1. Snap ring 22 on the end protruding outward
Is fitted and is rotatably held by the base member 1 by a holder 23 provided on the rotating arm 2 side.

The operating lever 3 is urged counterclockwise as viewed in FIG. 3 by a coil spring 25 inserted between a protruding piece 24 formed near the pivot 4 and a holder 23.

Further, the rotary arm 2 has a spiral return spring 2 whose center end is fixed to a holder 23.
When the outer peripheral end of 6 is locked, it is urged counterclockwise as viewed in FIG. 3 so as to urge the seat back toward the seat cushion.

Next, the operation of the above embodiment will be described.
Now, as shown in FIG. 1, it is assumed that the operation lever 3 is biased counterclockwise by the coil spring 25 and is engaged with the holder 23. In this state, the protruding engagement portions 16a and 16b of the cam 16 are respectively attached to the inner tooth 12A and
The counterclockwise rotation position is formed in which the protruding engagement portions 14a and 14b of the cam surface 14 of 12B are engaged.

Therefore, the inner teeth 12A, 12B
Are guided by the guide side walls 8a and 8b of the concave portion of the base member 1 and slide outward, respectively, and the external teeth 13 formed at the tip ends thereof
Are engaged with the internal teeth 21a, 21b of the rotating arm 2 and the engaging tooth portions 11a, 11b of the base member 1, respectively.

As a result, the locked state in which the rotation of the rotation arm 2 with respect to the base member 1 is restricted is maintained. In this locked state, the side walls of the inner teeth 12A and 12B are engaged with the guide side walls 8a and 8b of the recess 10 of the base member 1, and the external teeth 13 are the locking teeth 11a of the recess of the base member 1. It meshes with 11b.

Therefore, for example, when an excessive impact force acts on the seat back due to a collision accident, this impact force is transmitted to the inner teeth 12A, 12B via the rotating arm 2, but these inner teeth 12A, The impact force transmitted to 12B is applied to the guide side walls 8a, 8a of the base member 1.
b and the engaging tooth portions 11a, 11b are divided and received, and the surface pressure received by the guide side walls 8a, 8b is halved compared to the conventional example, and the guide side wall is deformed or damaged. Can be reliably prevented and a reclining function can be secured.

When the operating lever 3 is rotated clockwise in FIG. 1 against the coil spring 25 in this locked state, the cam 16 is also rotated clockwise in response to this, whereby the cam 16 moves. The protruding engaging portions 16a and 16b are the protruding engaging portions 14 of the cam surfaces 14 of the inner teeth 12A and 12B.
When the seat back is tilted to a desired tilting angle in this state, the turning arm 2 is turned in response to the tilting of the seat back.
The inner teeth 12A, 12B slide inward by the force transmitted from the inner teeth 12A, 12B to the inner teeth 12A, 12B by the force transmitted to the inner teeth 12A, 12B. When released, the locked state is released, and the seat back can be tilted at a desired tilt angle.

After the seat back has been tilted to the desired tilt angle, the cam 16 is rotated counterclockwise by releasing the rotation of the operating lever 3 to rotate the inner teeth 12A and 12B, respectively. The outer teeth 13 are slid outward in the radial direction so that the outer teeth 13 are recessed in the base member 1.
By engaging with the engaging tooth portions 11a and 11b in FIG. 3 and the inner teeth 21a and 21b of the rotating arm 2, the locked state is restored.

As described above, according to the above embodiment, in the locked state, the outer teeth 13 of the inner teeth 12A, 12B are not only the inner teeth 21a, 21b of the rotating arm 2 but also the base member 1.
When the excessive impact force is transmitted to the inner teeth 12A, 12B through the rotating arm 2 in this locked state by engaging with the locking tooth portions 11a, 11b of the base member 1 as well. Further, both the guide side walls 8a, 8b and the locking tooth portions 11a, 11b can share the work, and the deformation and damage can be surely prevented without increasing the mechanical strength of the guide side walls 8a, 8b.

In particular, in the case of using only a pair of inner teeth 12A and 12B having a reduced number of parts as compared with the three sets of blocks in the conventional example as in the above embodiment, the guide is provided in comparison with the three-point support. This is more effective because the surface pressure of the side walls 8a and 8b becomes large.

In the above embodiment, the case of having the pair of inner teeth 12A and 12B has been described, but the present invention is not limited to this, and three or more pairs of inner teeth may be provided at a predetermined angular interval. You may

Further, the base member 1, the rotating arm 2, the operating lever 3, the inner teeth 12A and 12B, and the cam 16 are provided.
The shape of is not limited to the above embodiment, and can be set to any shape.

[0029]

As described above, according to the internal tooth type reclining device of the present invention, when the reclining device is in the locked state, the tooth portion of the slide locking member is located outside the internal tooth of the rotating arm. When the excessive impact force is transmitted from the rotating arm side to the sliding engagement member, the impact force is engaged with the guide side wall in the recess of the base member. Since it can be divided and received by the tooth portion and the surface pressure of the guide side wall is reduced, the deformation and damage of the guide side wall can be reliably prevented without increasing the mechanical strength of the guide side wall. can get.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of an internal tooth type reclining device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view of FIG. 1;

FIG. 4 is a front view showing a base member of the internal tooth type reclining device according to the present invention.

FIG. 5 is an end view taken along the line BB of FIG. 4;

[Explanation of symbols]

 1 Base Member 2 Rotating Arm 3 Operation Lever 4 Pivot 8a Guide Sidewall 8b Guide Sidewall 11a Locking Teeth 11b Locking Teeth 12A Inner Tooth 12B Inner Tooth 13 External Teeth 14 Cam Surface 16 Cam 21a Inner Teeth 21b Inner Teeth

Claims (1)

[Claims] 1. A base member fixed to a seat cushion, a rotating arm rotatably supported by the base member and fixed to a seat back, and interposed between the base member and the rotating arm. A sliding locking member guided forward and backward by a recess side wall formed in the base member and having a tooth portion at its tip, and an engaging member for meshing the sliding locking member with an internal tooth formed on the rotating arm. An internal-tooth reclining device including at least a rotatable cam that moves between a stop position and a separated position that is separated from an internal tooth, and an operation lever that rotates the cam. An internal tooth type reclining device characterized in that a locking tooth portion that meshes with the tooth portion is formed on a wall surface that faces a tooth portion of the sliding locking member that is connected between the side walls that guide the stop member.