JP2000225032A - Seat adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat adjusting device using a taumel mechanism without requiring increase in the strength of hinge levers by preventing transmission of a large load to holes of one hinge lever. SOLUTION: This seat adjusting device with the taumel mechanism has a bearing 7 to engage with a pivot 5 and an eccentric wheel 6 rotatably in a hinge lever 1. A circular wedge segment 8 rotatable as pressed by the eccentric wheel 6 is engaged with the bearing 7, and tapered parts 16 and 17 are formed at both ends of the wedge segment 8. Two rotators 9, 9, respectively slidably abutting to the tapered parts 16, 17 and the pivot 5 are energized by a spring action member 10 and mounted inside the bearing 7. Two protrusions 14, 14 for moving the rotators 9, 9 against the force of the spring action member 10 are attached to the pivot 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge for connecting a seat back to a seat cushion of a vehicle seat apparatus so that the seat back can be continuously reclined and adjusted. It is provided with two hinge levers which are connected, an internal gear is formed on the one hinge lever, and an external gear engaged with the internal gear is formed on the other hinge lever,
The addendum circle of the external gear is smaller than the root circle of the internal gear by at least one tooth length, and the one of the hinge levers is on an eccentric wheel that is torque-coupled to the drive shaft that can be driven. It concerns an adjusting device of the type supported (a so-called Taumel mechanism).

[0002]

2. Description of the Related Art Conventionally, a continuously variable seat reclining device using a so-called taumel mechanism has been known (see Japanese Patent Publication No. 63-47443), which is an external gear having an eccentric shaft in an internal gear. By rotating, the intersection angle between the hinge lever fixed to the seat cushion side and the hinge lever fixed to the seat back side can be changed steplessly.

However, the internal gear and the external gear mesh with each other and cannot rotate unless there is a gap between the gears at the meshing portion. They have a fate that cannot be avoided. The invention described in the above-mentioned publication is provided for the purpose of eliminating or reducing such fate as much as possible. That is, as shown in FIG. 5, an internal gear 4a is formed on the hinge lever 2a, and an external gear 3a is formed on the hinge lever 1a. An eccentric wheel 6a is connected to the turning shaft 5a in a hole 7a formed in the hinge lever 1a so as to be integrally rotatable. Hole 7
Two wedge segments 8a biased by a spring action member 10a are fitted inside. 11a is a cover plate.

[0004]

However, according to the structure described in the above publication, when a load in the rotational direction acts between the hinge levers 1a and 2a, the internal gear 4 meshes with the hinge levers 1a and 2a.
In FIG. 5, a load F acts between the turning shaft 5a and the hinge lever 1a in order to separate the a and the external gear 3a from each other. This load F is applied to the wedge segments 8a, 8
a comes into pressure contact with the hole 7a of one hinge lever 1a, but since the load input direction overlaps the gap between the two wedge segments 8a, 8a and cannot receive the load F, the opposite ends of the wedge segments 8a, 8a are opposed. Therefore, a large load may be transmitted to the hole 7a of the hinge lever 1a, which may cause breakage. Therefore, it is necessary to increase the strength of one hinge lever 1a.

Accordingly, an object of the present invention is to provide a seat reclining device using a Taumel mechanism which prevents a load from concentrating on a part of a hole of one hinge lever and does not require high strength. And

[0006]

SUMMARY OF THE INVENTION A seat adjusting device according to the present invention comprises two hinge levers which are connected to each other via a pivot shaft, and one of the hinge levers is formed with an internal gear. At the same time, an external gear that meshes with the internal gear is formed on the other hinge lever, and the addendum circle of the external gear is smaller by at least one tooth height than the root circle of the internal gear, and A seat adjustment device of the type in which one of the hinge levers is mounted on an eccentric wheel that is torque-coupled to the driveable pivot shaft, wherein the other hinge lever allows the pivot shaft and the eccentric wheel to rotate. A fitted bearing portion is provided, and an arc-shaped wedge segment that is rotatable by being pushed by the eccentric ring is fitted to the bearing portion, and a tapered portion is formed on each inner peripheral surface of both ends of the wedge segment, The taper The rotating body that slides on the rotating shaft is urged by a spring acting member to be disposed in the bearing portion, and the protrusion that moves the rotating body against the force of the spring acting member is provided on the rotating shaft. It is characterized by being provided in.

[0007] A sliding contact portion is formed between the protruding portions of the turning shaft so as to slide on the wedge segment.

Therefore, when the rotation of the pivot shaft is stopped after the desired rotation operation is completed and the hinge lever is kept in the inclined state, the two rotating bodies are each formed of two tapered portions and the outer periphery of the pivot shaft by the spring action member. The wedge segments are moved outwardly against the surface, thereby pressing the external gear against the internal gear to eliminate backlash and prevent rattling.

[0009] When a load acts on the pivot axis,
The rotating body is pressed against the tapered portion by being pressed by the pivot shaft, and the wedge segment is pressed against the inner peripheral surface of the bearing portion so that the pivot shaft comes into contact with the wedge segment. The wedge segment has an arc portion that is in sliding contact with the inner peripheral surface of the bearing portion, receives a load over the entire arc portion and disperses it, and does not generate a concentrated load.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view with the cover plate removed, and FIG. 2 is an exploded perspective view. In the figures, reference numerals 1 and 2 denote hinge levers, and the hinge lever 1 is fixed to a seat cushion (not shown), and the hinge lever 2 is fixed to a seat back (not shown). Hinge lever 1
The external gear 3 is formed to protrude on one side by embossing or the like, and an internal gear 4 meshing with the external gear 3 is formed on the hinge lever 2 by embossing or the like. The addendum circle of the external gear 3 is smaller than the root circle of the internal gear 4 by at least one tooth height, and is on an eccentric wheel 6 that is torque-coupled to a pivot shaft 5 on which the hinge lever 1 can be driven. It is supported by

As shown in FIG. 3, two projecting portions 14 are integrally formed on the turning shaft 5, and these projecting portions 1 are formed.
A sliding contact portion 15 having a substantially triangular apex is formed between 4 and 14. The eccentric ring 6 is formed in a semicircular shape on the rear surface side of the sliding contact portion 15, and is rotatable with the turning shaft 5 with a predetermined gap between the eccentric ring 6 and the bearing portion 7 of the hinge lever 1. On the opposite side of the eccentric ring 6 in the bearing 7, a projection 14,
The crescent-shaped wedge segment 8 is inserted between the sliding contact portion 14 and the sliding contact portion 15, and tapered portions 16, 17 facing the projections 14, 14 are formed on the inner peripheral surfaces of both ends of the wedge segment 8, respectively. I have. A bearing ring is press-fitted into the bearing portion 7.

The two rotating bodies 9 rotatable in sliding contact with the tapered portions 16 and 17 and the turning shaft 5, respectively, are mounted on the bearing portion 7.
It is located near both ends of the wedge segment 8 and is elastically mounted by the spring action member 10. The annular portion of the spring action member 10 is disposed between the embossed concave portion of the hinge lever 1 and the cover plate 11, and both ends protrude toward the hinge plate side to serve as a rotation axis of the rotating body 9. . The spring action member 10 urges the rotating bodies 9 in a direction approaching each other (the direction of arrow A in FIG. 3) to abut the outer peripheral surface of the turning shaft 5 and the tapered portions 16 and 17, thereby causing the wedge segments 8 to move. It is pressed against the bearing 7.

The cover plate 11 is integrally connected to the hinge lever 2 to cover these mechanisms. Holes 12 and 13 are formed in the hinge lever 2 and the cover plate 11 to support both ends of the turning shaft 5.
The holes 12 and 13 are formed concentrically with the center of the internal gear 4. An electric motor or a manual operation knob is connected to the turning shaft 5 outside the cover plate 11.

In order to adjust the inclination angle of the hinge lever 2 with respect to the hinge lever 1, as shown in FIG.
When the rotating shaft 5 is rotated clockwise by electric or manual operation, the protrusion 14 on the rotation direction pushes and moves one of the rotating bodies 9 to move the tapered portion 16 away from the wedge segment 8 while the spring acting member 10 is moved. Similarly, the other rotating body 9 slides on the tapered portion 17 and moves toward the eccentric wheel 6 with the elasticity of the wedge segment 8, so that the wedge segment 8 becomes free and rotatable, and the end portion 18 of the eccentric wheel 6 becomes free. The end 19 of the wedge segment 8 is pushed and turned clockwise in the bearing 7.

When the rotating shaft 5 is rotated counterclockwise by electric or manual operation, the projection 14 on the rotation direction pushes and moves the other rotating body 9 to separate the tapered part 17 from the sliding wedge segment 8. On the other hand, the one rotating body 9 similarly slides on the tapered portion 16 by the elasticity of the spring action member 10 and moves toward the eccentric wheel 6, so that the wedge segment 8
Is free and rotatable, and the end 20 of the eccentric ring 6 pushes the end 21 of the wedge segment 8 and rotates counterclockwise in the bearing 7.

When the rotation of the revolving shaft 5 is stopped after the desired rotation operation is completed and the inclined state of the hinge lever 2 is maintained, the spring action member 10 returns to the initial state, and the rotating bodies 9 and 9 It comes into contact with the tapered portions 16 and 17 and the outer peripheral surface of the turning shaft 5, respectively, and returns to the initial state. That is, the two rotating bodies 9 are respectively provided with the tapered portions 16 and 17 and the turning shaft 5.
And the sliding contact portion 15 abuts the substantially central portion of the wedge segment 8 so that the wedge segment 8 is fixed and stationary, whereby the external gear 3 is pressed against the internal gear 4 to generate play. Has been blocked.

Therefore, when a load F is applied to the rotating shaft 5, the rotating members 9, 9 are pressed by the rotating shaft 5, and the tapered portions 1
6, 17 respectively, and
In order for the abutment portion 15 to abut on the wedge segment 8,
The wedge segment 8 is pressed against the inner peripheral surface of the bearing 7. The wedge segment 8 has an arc portion that is in sliding contact with the inner peripheral surface of the bearing portion 7, receives and disperses the load F over the entire arc portion, and does not generate a concentrated load.

[0018]

According to the present invention described above, it is possible to eliminate backlash by pressing the external gear against the internal gear and to prevent the occurrence of backlash. When the rotating body is crushed, the rotating shaft comes into contact with the wedge segment, and the input load can be dispersed and directly transmitted to the other hinge lever by the wedge segment, so that the input load can be reduced. Further, since the input load is transmitted to the bearing portion over the entire arc portion of the wedge segment, the load is dispersed without being concentrated, so that the other hinge lever can be prevented from increasing in strength.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention with a cover plate removed.

FIG. 2 is an exploded perspective view.

FIG. 3 is an enlarged view of a main part.

FIG. 4 is an explanatory diagram of an operation.

FIG. 5 is a front view of a conventional example with a partly broken illustration.

[Explanation of symbols]

 1, 2 ... Hinge lever 3 ... External gear 4 ... Internal gear 5 ... Revolving shaft 6 ... Eccentric ring 7 ... Bearing 8 ... Wedge segment 9 ... Rotating body 10 ... Spring action member 11 ... Cover plate 14 ... Projection 15 ... Sliding contact part 16,17 ... Tapered part

Claims (2)

[Claims] 1. An internal gear is formed on one hinge lever, and the other hinge lever meshes with the internal gear on the other hinge lever. An external gear is formed, and the addendum circle of the external gear is smaller than the root circle of the internal gear by at least one tooth height, and torque is transmitted to the turning shaft on which one of the hinge levers can be driven. In the seat adjusting device of the type supported on the coupled eccentric, the other hinge lever is provided with a bearing portion for rotatably fitting the pivot shaft and the eccentric, and the bearing portion includes the bearing portion. An arc-shaped wedge segment that is rotatable by being pushed by an eccentric wheel is fitted, a tapered portion is formed on each inner peripheral surface of both ends of the wedge segment, and a rotating body that slides on the tapered portion and the turning shaft is provided. Spring action And biasing at timber disposed in said bearing portion, and adjustment device of the seat, wherein a protrusion for moving the rotary body against the force of the spring action member provided on the pivot shaft. 2. A seat adjusting device according to claim 1, wherein a sliding contact portion is formed between said projecting portions of said pivot shaft so as to slide on said wedge segments.