JP3021968B2 - Vehicle seat with reclining mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat having a reclining mechanism.

[0002]

2. Description of the Related Art As one form of a vehicle seat, the left and right lower ends of a back frame constituting a seat back are respectively provided in the front and rear directions at the left and right rear ends of a cushion frame constituting a seat cushion. There is a vehicle seat with a reclining mechanism that is rotatably assembled and has a reclining mechanism disposed on at least one of its lower ends. An example is disclosed in Japanese Patent Application Laid-Open No. Sho 60-21710. The vehicle seat has been proposed in order to add sufficient strength to the seatback to withstand an excessive forward force acting on the seatback via a seatbelt at the time of a vehicle collision or the like. A support member is provided between the side frames of the cushion frame and the back frame, and the support member functions as a reinforcing member for the seat back. The support member also functions as a reinforcing member in a vehicle seat to which the seat belt is not fixed, when an excessive force is applied from the rear.

[0003] Since the vehicle seat is provided with a reclining mechanism, a supporting member is configured to be extendable and contractible in the longitudinal direction so as to exhibit the function of the reclining mechanism. When the operating lever is operated to release the engagement of the pawl constituting the reclining mechanism with the ratchet, the lock by the lock mechanism of the supporting member is released in conjunction with this operation,
When the support member becomes extendable and the seat back can rotate in the front-rear direction, and then the operation of the operating lever is released to engage the pawl with the ratchet and regulate the rotation of the seat back, the rotation is linked to this. As a result, the support member is locked and cannot expand or contract to exert a reinforcing function.

[0004]

In the above-described vehicle seat with a reclining mechanism, since the lower end of the support member is not configured to move in the front-rear direction, the support member is required to sufficiently exhibit the reinforcing function of the support member. If the lower end of the vehicle is located as far forward as possible, there is a problem that when the support member is located on the side of the vehicle at the entrance of the vehicle, the support member obstructs the occupant from getting on and off. In order to cope with this, when the support member is disposed on the side of the seat opposite to the entrance of the vehicle so as not to obstruct the occupant from getting on and off, that is, on the seat interior side of the seat, steering operation, shift lever operation, etc. When the seat is mounted with the upper end of the seat belt on the top of the seat back, the shoulder anchor of the seat belt travels upward near the center of the passenger compartment. Therefore, there is a possibility that the front view of the rear seat with respect to the occupant is deteriorated.

[0005] Further, in the vehicle seat, a seal is provided.
When adjusting the inclination angle of the toeback, an operation force that opposes the two return springs of the reclining mechanism and the support member side lock mechanism is required, and the operability is impaired due to an increase in the operation force. Further, since the engagement portion of the reclining mechanism and the lock portion of the support member side lock mechanism are separated from each other, a shift occurs between the engagement release operation and the lock release operation, and it is difficult to synchronize both operations. is there. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to eliminate the above-mentioned problems caused by the support member by increasing the support strength of the reclining mechanism for the seatback in the vehicle seat with the reclining mechanism.

[0006]

Means for Solving the Problems The present invention is to - cushion frame constituting the cushions - each side of the left and right of the back frame constituting the-back - the rear ends of the left and right arm
The lower end of the frame portion is assembled via each reclining mechanism , and the respective side frames of the back frame
The seat belt is located above the frame on one side.
In a vehicle seat having a reclining mechanism provided with a shoulder anchor portion, the seat belt is provided when a vehicle collides.
Through each side frame of the back frame
Corresponding to the load to be applied, the lower end of one side frame
The radius of curvature of the arcuate teeth of the ratchet constituting one of the reclining mechanisms to be assembled is
It is characterized in that it is set to be larger than the radius of curvature of the arcuate teeth of the ratchet constituting the other reclining mechanism to which the lower end is assembled .

[0007]

In the vehicle seat with the reclining mechanism having the above construction, the rotation of the seat back with respect to the seat cushion in the front-rear direction is controlled by the ratchets constituting the reclining mechanisms and the pawls meshing therewith. The left and right meshing portions of each pole with respect to each ratchet function as lock portions. Therefore,
The meshing portion is a supporting portion of the seat cushion for the seat cushion, and the farther the meshing portion is from the pivot of the seat back for the seat cushion, the higher the supporting force.

[0008] In the vehicle seat, the radius of curvature of the arcuate teeth of the ratchet constituting the one reclining mechanism is set to be larger than the radius of curvature of the arcuate teeth of the ratchet constituting the other reclining mechanism. Therefore, the meshing portion of the pawl in one reclining mechanism with respect to the ratchet is farther from the pivot of the seatback with respect to the seat cushion than the meshing portion of the other reclining mechanism, and the conventional reclining mechanism is provided. The seat back has a higher supporting force than the sheet. In the vehicle seat,
If one of the reclining mechanisms has a high supporting force for the seat back, the seat back can be sufficiently reinforced.

That is , in the vehicle seat, the back frame is provided with a shoulder anchor portion of the seat belt above one of the left and right side frame portions.
An excessive load acts on the seat back through the seat belt at the time of a vehicle collision or the like . In this case, a shoulder anchor portion is provided.
The load acting on one of the side frames is
The other side frame part without the da anchor part
Very large compared to the load acting on the The vehicle system
The lower end of one side frame
Of the ratchet that constitutes one of the reclining mechanisms
Set the radius of curvature of the arcuate teeth to the lower end of the other side frame.
Ratchet that constitutes the other reclining mechanism
Set larger than the radius of curvature of the arcuate teeth of the
Therefore, it is possible to sufficiently cope with this. By such means , it is possible to eliminate the waste of increasing the size of the ratchet constituting the other reclining mechanism, and it is possible to set the shoulder anchor portion of the seat belt at the side of the vehicle compartment, and to attach the anchor portion to the vehicle compartment. Each of the disadvantages in the case of disposing in the central portion of the device can be solved.

In the vehicle seat, the left and right side frame portions forming the cushion frame are formed by movable side rails forming each seat track, and the one reclining mechanism is formed. The ratchet to be fixed to the lower end of the side frame portion of the back frame, the lower arm constituting the reclining mechanism is fixed to the side of the movable rail, and the reclining mechanism constitutes the ratchet. It is preferable that a pawl that meshes with the arcuate teeth so as to be disengageable is swingably mounted on the lower arm side, and one of the reclining mechanisms having a large ratchet by such a configuration is disposed without any trouble. can do.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cushion frame 11 and a seat cushion and a seat back of a vehicle seat with a reclining mechanism according to the present invention. The back frame 12 is shown. In the vehicle seat, the cushion frame 11 is formed in a frame shape, and is attached to the vehicle body floor by the left and right seat tracks 13. Further, the back frame 12 is also formed in a frame shape, and both lower end portions thereof are attached to the rear end portion of the cushion frame 11 so as to be rotatable in the front-rear direction via both left and right reclining mechanisms 20 and 30. .

The left and right frame portions 11a and 11b constituting the cushion frame 11 also function as movable rails of the sheet track 13, and the right frame portion 1
1a and right frame 12 constituting back frame 12
A rod-shaped support member 14 is disposed between the portions a, and a winding device 16 for the seat belt 15 is disposed at an upper end of the right frame portion 12a. Winding device 16
Functions as a shoulder anchor for the seat belt 15.
I do. In the support member 14 has its upper end mounted rotatably to the longitudinal direction via the spring member to the bracket 17 provided on the right frame portion 12a of the back frame 12 at, and at its lower end, as described below The right reclining mechanism 20 (hereinafter, referred to as a first reclining mechanism 20; the left reclining mechanism 30 is referred to as a second reclining mechanism 30) is assembled to a ratchet and constantly urged forward.

The first reclining mechanism 20 is shown in FIGS.
As shown in FIG. 2, the motor comprises a ratchet 21, a pawl 22, a release lever 23, a lower arm 24, a roller 25, an interlocking arm 26, a connecting lever 27, and a cover 28. Ratchet 21 is back frame 12
Is fixed to the lower end of the right side frame portion 12a, an arc-shaped tooth portion 21a is formed at the lower end edge portion, and an arc-shaped long hole 21b is formed at a tip end protruding portion.
The radius of curvature of the tooth portion 21a is set to R1. Slot 2
Reference numeral 1b denotes an arc shape centered on a pivot point at the upper end of the support member 14. The lower end of the support member 14 is attached to the elongated hole 21b via a support pin 14a. The lower end of the support member 14 is slidable along the elongated hole 21b via the support pin 14a, and is always located at the front end of the elongated hole 21b by the urging force of a spring member (not shown).

The lower arm 24 is connected to the cushion frame 11.
Of the back frame 12 together with the release lever 23, the interlock arm 26 and the cover 28.
a is rotatably mounted in the front-rear direction via a hinge pin 29 at the lower end of the a. The cover 28 is fixed to the inner surface of the lower arm 24, holds the ratchet 21 together with the lower arm 24, and swingably supports the pawl 22. The pole 22 is a tooth 21 of the ratchet 21.
a, and a cam pin 22b engaged with a cam hole 23a provided on the release lever 23 and a cam hole 24a provided on the lower arm 24, and a recess provided on the inner surface of the lower arm 24. 24b. The roller 25 is supported by the release lever 23 and the interlocking arm 26 and is provided with a recess 24 b of the lower arm 24.
And is engaged with the cam hole 24a, and is received by the step portion 24c on the front end side of the recess 24b. The step portion 24c has a substantially arc shape and extends upward.

The roller 25 is located at the lower end of the pole 2
2, the tooth portion 22a of the pawl 22 meshes with the tooth portion 21a of the ratchet 21. When the release lever 23 is turned, the stepped portion 24c of the recess 24b is slid upward and the pawl 22 is rotated. Away from the back of the At the same time, the pawl 22 is separated from the ratchet 21 by the action of the cam pin 22b and the cam hole 23a to release the mesh with the ratchet 21.

The second reclining mechanism 30 has a connecting rod in place of the release lever 23 constituting the first reclining mechanism 20 except that a connecting rod is provided.
0, a ratchet 31, a pole 32, and a connecting rod 3 as shown in FIGS.
3, a lower arm 34, a roller 35, an interlocking arm 36, a connecting lever 37, and a cover 38. The ratchet 31 is fixed to the lower end of the left frame portion 12b of the back frame 12, and has an arcuate tooth 31a at the lower end edge. Ratchet 3
The radius of curvature of the first tooth portion 31a is the first reclining mechanism 2
The ratchet 21 is formed to have a radius of curvature R2 smaller than the radius of curvature of the tooth portion 21a of the ratchet 21 by a predetermined amount, and does not have a slot corresponding to the arc-shaped slot 21b of the ratchet 21.

The lower arm 34 is connected to the cushion frame 11.
Is fixed to the inner surface of the rear end of the left frame portion 11b, and is attached to the lower end portion of the left frame portion 12b of the back frame 12 together with the interlocking arm 36 and the cover 38 via the hinge pin 39 so as to be rotatable in the front-rear direction. Have been. The cover 38 is fixed to the inner surface of the lower arm 34, holds the ratchet 31 together with the lower arm 34, and swingably supports the pole 32. The pole 32 has a tooth 3 opposed to the tooth 31 a of the ratchet 31.
2a, and has a cam pin 32b engaged with a cam hole 36a provided in the interlocking arm 36 and a cam hole 38a provided in the cover 38, and is located in a recess 34b provided on the inner side surface of the lower arm 34. I have. Roller 35
Is supported by the interlocking arm 36 and the recess 3 of the lower arm 34
4b, is engaged with the cam hole 38a, and is received by the step 34c on the front end side of the recess 34b. The step portion 34c has a substantially arc shape and extends upward.

The roller 35 is located at the lower end of the pole 3
2, the teeth 32a of the pawl 32 are meshed with the teeth 31a of the ratchet 31.
With the turning operation of the above, the step 34c of the recess 34b is slid upward and separated from the back of the pole 32. Pole 32 at the same time
Is separated from the ratchet 31 by the action of the cam pin 32b and the cam hole 36a to release the meshing with the ratchet 31.

The connecting rod 33 is integrally provided with connecting levers 37 and 27 at each end, and each end is fitted to the inner end of each hinge pin 29 and 39. In this state, the connecting lever 37 is hooked on the interlock arm 36 of the second reclining mechanism 30, and the connecting lever 27 is hooked on the interlock arm 26 of the first reclining mechanism 20. This allows
The rotation operation force of the release lever 23 of the first reclining mechanism 20 is transmitted as the operation force of the second reclining mechanism 30, and the operations of both reclining mechanisms 20, 30 are interlocked with each other.

In the vehicle seat configured as described above, when the pawls 22 and 32 constituting the reclining mechanisms 20 and 30 are engaged with the ratchets 21 and 31, the engaged position is a lock position. The back frame 12 (sheet back) is held in a locked state with respect to the cushion frame 11 (sheet cushion).
In this state, the ratchet 21 is integral with the cushion frame 11, and the support member 14 is in a state where the back frame 12 is connected to the cushion frame 11. Therefore, the supporting member 14 functions as a reinforcing member of the back frame 12 and the lower end of the supporting member 14 is located at the front end of the long hole 21b of the ratchet 21, so that the reinforcing function of the supporting member 14 is sufficiently exhibited. Is done.

[0021] Incidentally, in the first reclining mechanism 20, the radius of curvature R1 of the teeth of the ratchet 21 second
Ratchet 31 teeth forming reclining mechanism 30
It is set to be larger than the radius of curvature R2 of the portion. This
Therefore , the pole 2 in the first reclining mechanism 20
The engagement portion of the second ratchet 21 with the ratchet 21 is located far from the pivot of the seat back with respect to the seat cushion .
Compared to 2 reclining mechanism 30 - bearing capacity-back is high, back in cooperation with reinforcing function of the support member 14
Layer 12 on the side frame portion 12a side of the frame 12
Demonstrate great support. In the vehicle seat,
The back frame 12 is located above the right side frame portion 12a.
To the take-up device 16 (shoulder anchor) for the seat belt 15
Part) is provided, so that the seat
Excessive load acts on the seat back through the tilt 15
However, in this case, the load acting on the side frame portion 12a
Is provided with a winding device 16 (shoulder anchor portion)
Compared to the load acting on the side frame portion 12b
Very large. In the vehicle seat, side deflection
First recliner to which the lower end of the arm portion 12a is attached
Radius of curvature R1 of the teeth of the ratchet 21 of the
A second link mounting the lower end of the side frame portion 12b
Curvature radius of the teeth of the ratchet 31 of the lining mechanism 30
Because it is set larger than R2,
Can respond. By such means, the second reclamation
Increase the size of the ratchet 31 constituting the inning mechanism 30
Waste can be eliminated and the seat belt
15 winding device 16 (shoulder anchor part)
The anchor can be set at the center of the cabin.
It is possible to solve each problem in the case of arrangement.

In the vehicle seat, the left and right side frame portions 1 constituting the cushion frame 11 are also provided.
1a and 11b are formed by movable rails constituting each sheet track 13, and a ratchet 21 constituting a first reclining mechanism 20 is fixed to a lower end of a side frame portion 12a of the back frame 12, and The lower arm 24 of the reclining mechanism 20 is fixed to the side of the movable rail, and the pawl 22 of the reclining mechanism 20 is swingably attached to the lower arm 24. Accordingly, the first reclining mechanism 20 in which the ratchet 21 is enlarged can be disposed without any trouble.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cushion frame and a back frame constituting a vehicle seat according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a first reclining mechanism of the seat.

FIG. 3 is a side view of the reclining mechanism.

FIG. 4 is an arrow 4- in FIG. 3 of the reclining mechanism.
It is sectional drawing seen in the 4 line direction.

FIG. 5 is an exploded perspective view showing a first reclining mechanism of the seat.

FIG. 6 is a side view of the reclining mechanism.

FIG. 7 is an arrow 7- of FIG. 6 in the reclining mechanism.
It is sectional drawing seen in the 7-line direction.

[Explanation of symbols]

11: cushion frame, 12: back frame, 1
4. Support member, 20, 30 ... Reclining mechanism, 2
1, 31 ... ratchet, 21b, 31b ... arc-shaped long hole,
22, 32: pole, 23: release lever, 33: connecting rod, 24, 34: lower arm, 26,
36 ... Interlocking arm, 27, 37 ... Connecting lever.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kunio Nishiyama 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) A47C 1/00-1 / 16

Claims (1)

(57) [Claims] 1. A lower end portion of each of left and right side frame portions of a back frame constituting a seat back is provided at each of left and right rear end portions of a cushion frame constituting a seat cushion through respective reclining mechanisms. Assembly and the backflush
Of one side frame portion of each side frame portion of the
Do not provide a shoulder anchor for the seat belt in the upper part.
That in the sheet for the reclining mechanism with a vehicle, vehicle
At the time of collision the back frame through the seat belt
Corresponding to the load acting on each side frame part of
The radius of curvature of the arcuate teeth of the ratchet constituting one reclining mechanism for assembling the lower end of the side frame portion, and the circle of the ratchet constituting the other reclining mechanism for assembling the lower end of the other side frame portion. A seat for a vehicle with a reclining mechanism, wherein the seat is set to be larger than a radius of curvature of an arcuate tooth portion.