JPH0661147U - Reclining mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] By controlling the axial displacement of the ratchet that constitutes the reclining mechanism on the hinge pin, the axial displacement of the meshing position between the ratchet and the pole is eliminated.
Eliminating the means of increasing their thickness to ensure the strength of the mating parts. [Structure] A support pin 23 for fixing a ratchet 13 to an upper arm 12 is inserted into an arc hole 11a of a lower arm 11 so as to be slidably caulked with respect to the lower arm 11, and a release pin 14b provided on a pole 14 is attached to a lower arm. It is inserted into an arc hole 11c provided in 11 and slidably caulked to eliminate the axial displacement of the ratchet 13 and the hinge pin 19 of the upper arm 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reclining mechanism used for a reclining seat for vehicles.

[0002]

[Prior art]

 As one type of reclining mechanism, as shown in the publication "Automotive Engineering Handbook, Vol. 6, pages 1-25 to 1-26 (published by the Society of Automotive Engineers, September 30, 1983)," A lower arm fixed to the seat cushion side, an upper arm fixed to the seat back side and rotatably attached to the lower arm in the front-rear direction via a hinge pin, and fixed to the upper arm via a support pin. A ratchet that is rotatably mounted on the hinge pin and rotates integrally with the upper arm, and a ratchet that is swingably mounted on the lower arm and is located on the same plane as the ratchet and has an arc shape of the ratchet. The pole is detachably engaged with a part of the tooth portion and the lower arm is rotatably assembled by being biased by the spring and is attached to the pole via a release pin provided on the pole. There is a reclining mechanism having a release lever for release the same mesh with the turning operation causes mesh with Chietto.

In the reclining mechanism, the ratchet and the upper arm can be rotated in the front-rear direction by separating the pole from the ratchet by rotating the release lever, and after rotating the upper arm arbitrarily, the rotating operation of the release lever. By releasing, the pole can be engaged with the ratchet and the upper arm can be fixed to the lower arm. As a result, the seat back to which the upper arm is fixed can be adjusted to any angle in the front-rear direction with respect to the seat cushion.

[0004]

[Problems to be solved by the device]

 By the way, in the reclining mechanism, the upper arm and the ratchet are rotatably mounted on the hinge pin, and the E-ring is mounted on the pin to prevent the hinge pin from coming off in the axial direction. In such an assembly structure, in order to allow the rotation of the upper arm and the ratchet, and to facilitate the assembly of the E ring onto the hinge pin, the space between the upper arm and the ratchet and the E ring is set. A certain amount of clearance is provided in the axial direction of the hinge pin, and a certain amount of clearance is also provided between the inner circumference of the upper arm and ratchet and the outer circumference of the hinge pin.

For this reason, the position of the hinge pin in the axial direction may occur in the upper arm and the ratchet during use of the reclining mechanism, and the meshing position between the ratchet and the pole may shift in the thickness direction thereof, resulting in such deviation. Then, the strength of the meshing part will be lower than the strength set by the thickness of the ratchet and pole. Therefore, in the reclining mechanism, it is necessary to secure the strength of the meshing portion, and in order to cope with this, it is necessary to increase the thickness of the ratchet and the pole in advance, and increase the weight of the reclining mechanism. This will increase costs. Therefore, an object of the present invention is to address such a problem.

[0006]

[Means for Solving the Problems]

 The present invention comprises a lower arm fixed to the seat cushion side, an upper arm fixed to the seat back side and rotatably attached to the lower arm through a hinge pin in the front-rear direction, and a support pin attached to the upper arm. A ratchet fixed via the hinge pin and rotatably mounted on the hinge pin to rotate integrally with the upper arm; and a ratchet mounted to the lower arm swingably and located on the same plane as the ratchet. A pole that engages with a part of the arcuate tooth portion in a separable manner and a lower arm that is rotatably assembled by being biased by a spring and is engaged with the ratchet via a release pin provided on the pole. In a reclining mechanism having a release lever that releases the meshed state by a rotating operation, the support pin is connected to the upper arm. A circular hole provided in the lower arm and an arc hole centered on the hinge pin provided in the lower arm and fixed by caulking to both arms to fix the ratchet to the upper arm and slidable to the lower arm, The release pin is fixed to the lower arm by caulking the lower arm and the pole with the release arm inserted in an arc hole centered on the support portion of the pole and fixed to the lower arm. It is characterized by being slidable.

[0007]

[Operation and effect of the device]

 In the reclining mechanism thus configured, the ratchet and the release pin provided on the pole are assembled via the lower arm, so that the ratchet and the pole slide on the surface of the lower arm. Although there is a clearance in each part of the assembly part of the mat, the hinge pins of both of them do not shift in the axial direction. Therefore, according to the reclining mechanism, the strength of the meshing portion of the ratchet and the pole becomes the strength corresponding to the thickness of both of them, and the thickness of both of them is preliminarily considered in consideration of the strength reduction due to the deviation of the both. It is not necessary to increase the thickness, and the weight and cost can be reduced.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a reclining mechanism according to the present invention. The reclining mechanism is used for a vehicle reclining seat and includes a lower arm 11, an upper arm 12, a ratchet 13, a pole 14 and a release lever 15, and a tension spring 16, a cam 17 and a spiral spring 18.

The lower arm 11 is fixed to the seat cushion side (not shown) of the vehicle seat, and the upper arm 12 is fixed to the seat back side. The upper arm 12 is rotated on the hinge pin 19 fixed to the lower arm 11. It is assembled as possible. The ratchet 13 has a fan shape, and an arcuate tooth portion 13a is formed on a part of the outer peripheral edge thereof, and is fixed to one side surface of the upper arm 12 and fitted to the outer periphery of the hinge pin 19. The ratchet 13 is located between the arms 11 and 12 in this state. The pole 14 is mounted between the lower arm 11 and the sub-plate 20 so that the base end portion of the pole 14 can be rotated by the first support pin 21 and is positioned on the same plane as the ratchet 13. At the swinging end of the pole 14, there is formed a tooth portion 14a which is releasably engaged with a part of the tooth portion 13a of the ratchet 13.

The release lever 15, together with the cam 17, is rotatably attached to the lower arm 11 and the side plate 20 by the second support pin 22 while being sandwiched between the lower arm 11 and the side plate 20. The release lever 15 is assembled to the lower arm 11 at an intermediate portion, one side of which is formed in the operating portion 15a, and the other side of which is formed with a cam groove 15b. The release pin 14b provided on the pole 14 is inserted into the cam groove 15b. The cam 17 is fixed to the release lever 15, and its tip can come into contact with and separate from the back of the pole 14.

The tension spring 16 is hooked between the lower arm 11 and the release river 15 and always urges the release lever 15 counterclockwise in FIG. As a result, the tension spring 16 moves the release lever 15 to the lower non-actuated position, and the cam groove 15b of the release lever 15 and the release pin 14b of the pawl 14 cause the pawl 14 to be part of the tooth portion 13a of the ratchet 13. The cams 17 are meshed with each other, and the cam 17 is brought into contact with the back portion of the pole 14. Further, the spiral spring 18 is hooked between the upper arm 12 and the hinge pin 19 and always urges the upper arm 12 counterclockwise in the drawing. In this state, the upper arm 12 is fixed to the lower arm 11, and the seatback to which the upper arm 12 is fixed is erected at a predetermined inclination angle.

Therefore, the ratchet 13 is fixed to the upper arm 12 by the plurality of third support pins 23. The third support pin 23 is inserted into the circular holes of the upper arm 12 and the ratchet 13, and is inserted into the first circular arc hole 11a provided in the lower arm 11 and crimped via the washer 11b. The first arc hole 11a is formed in an arc shape with the hinge pin 19 as the center, and the third support pin 23 can slide in the first arc hole 11a in this state. Therefore, the ratchet 13 slides on the side surface of the lower arm 11 when the upper arm 12 rotates.

The release pin 14b is inserted into the second circular arc hole 11c provided in the lower arm 11 and is staked through the washer 11d while being inserted through the circular hole of the pole 14. The second arcuate hole 11c is formed in an arcuate shape around the pivot fulcrum of the pole 14, and the release pin 14b slides in the second arcuate hole 11c in this state. Therefore, when the pole 14 rotates, it slides on the side surface of the lower arm 11.

In the reclining mechanism configured as described above, the tooth portion 14 a of the release lever 15 when the pawl 14 is not operated meshes with a part of the arc-shaped tooth portion 13 a of the ratchet 13, and the upper arm 12 is connected to the lower arm 11. It is fixed to. For this reason, the seat back (not shown) is fixed to the seat cushion and stands up at a predetermined inclination angle.

In order to adjust the inclination angle of the seat back in this state, the release lever 15 is rotated in the clockwise direction shown in FIG. 1 against the tension spring 16. As a result, the cam groove 15b of the release lever 15 shifts in the clockwise direction in the drawing and the cam 17 rotates in the same direction, so that the pole 14 is separated from the ratchet 13 in cooperation with the release pin 14b. As a result, the upper arm 12 can be rotated in the front-rear direction, and can be rotated forward by the urging force of the spiral spring 18 and can also be rotated rearward against the spring 18 to move the seat back and forth. The inclination angle of the direction can be adjusted arbitrarily.

In the reclining mechanism, however, as shown in FIG. 2, since the release pin 14b provided on the ratchet 13 and the pole 14 is assembled via the lower arm 11, the ratchet 13 and the pole 14 are connected to each other. Since it slides on the side surface of the upper arm 12 and the ratchet 13, the hinge pin 14b between the upper arm 12 and the ratchet 13 and the pole 14 is axially aligned even though there is a clearance in each part of the assembly part of the upper arm 12 and the ratchet 13. No deviation occurs. Therefore, according to the reclining mechanism, the strength of the meshing portion of the ratchet 13 and the pole 14 is the strength corresponding to the thickness of both of them, and the thicknesses of both of them are preliminarily considered in consideration of the strength reduction caused by the deviation of the both. Since it is not necessary to make it thick, it is possible to reduce weight and cost.

[Brief description of drawings]

FIG. 1 is a side view of a reclining mechanism according to an embodiment of the present invention.

FIG. 2 is an arrow 2- of the reclining mechanism in FIG.
It is a sectional view of the direction of two lines.

[Explanation of symbols]

11 ... Lower arm, 11a, 11c ... Arc hole, 12 ... Upper arm, 13 ... Ratchet, 14 ... Pole, 14b
... release pin, 15 ... release lever, 19 ... hinge pin, 22,23 ... support pin.

Claims (1)

[Scope of utility model registration request] 1. A lower arm fixed to the seat cushion side, an upper arm fixed to the seat back side and rotatably assembled to the lower arm via a hinge pin in the front-rear direction, and a support pin attached to the upper arm. A ratchet fixed via the hinge pin and rotatably mounted on the hinge pin to rotate integrally with the upper arm; and a ratchet mounted on the lower arm swingably and located on the same plane as the ratchet. A pole that engages with a part of the arcuate tooth portion in a separable manner, and a release pin provided on the pole that is rotatably assembled to the lower arm by being biased by a spring and engages the pole with the ratchet. In a reclining mechanism having a release lever that releases the meshed state by a rotating operation, the support pin is attached to the upper arm. The circular hole and the lower arm are inserted into an arc hole centered on the hinge pin and fixed to both arms by caulking to fix the ratchet to the upper arm and slidable to the lower arm, and A release pin is fixed to the lower arm and the pole by being caulked to the lower arm while being inserted into an arc hole centered on the support portion of the pole and is slidable with respect to the lower arm. A reclining mechanism characterized by that.