JPS5846910A - Angle adjusting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angle adjustment device suitable as a reclining device for an automobile seat, and in particular, an external gear and an internal gear that partially meshes with the external gear are rotatably connected by an eccentric shaft. This invention relates to a device using a differential speed reduction mechanism.

Conventionally, angle adjustment devices using differential reduction mechanisms include:
For example, a reclining device shown in FIG. 1 is well known.

In the reclining device shown in FIG. 1, an external gear 1a is formed on a bracket 1 on the seat cushion side, and an internal gear 2a having the same pitch as the external gear 1a and a slightly larger number of teeth is formed on a bracket 2 on the seat back side. has been done.

Further, the bracket 1 and the bracket 2 are rotatably connected to each other by an eccentric shaft 3 having an eccentric portion 3a, and the external gear 1a and the internal gear 2a are partially meshed.

Therefore, when the eccentric shaft 3 is rotated by the handle 5,
The external gear 1a swings and rotates with respect to the internal gear 2a, and
Along with this rocking rotation, the meshing position of the external gear 1a and the internal gear 2a sequentially moves, and the relative angle between the brackets 1 and 2 with the eccentric shaft 3 as the fulcrum changes, so that the reclining angle becomes stepless. It is being adjusted.

However, in the above-mentioned conventional device, a small clearance is required at the meshing portion between the external gear 1a and the internal gear 2a in order to smooth the rocking rotation of the external gear 1a, but if this clearance is large, bracket 1 and bracket 2
There is a backlash between the two parts, making it difficult to set a reasonable clearance.Furthermore, each part requires high dimensional accuracy, making manufacturing time-consuming.

The present invention solves the above-mentioned conventional disadvantages by making the eccentric shaft connecting the external gear and the internal gear movable in its axial direction, and by providing a cam mechanism between the eccentric shaft and one of the gears. Embodiments shown in FIGS. 2 and 3 in which the present invention is applied to a reclining device will be described below. This will be explained in detail based on the following.

In the figure, 1 is the bracket on the seat cushion side,
2 is a bracket on the seat back side. Bracket 1
An external gear 1a is integrally formed on the bracket 2, and an internal gear 2a having the same pitch as the external gear 1a and a slightly larger number of teeth is integrally formed on the bracket 2. 3 is an eccentric shaft provided with a cam portion 31) at its tip, and 4 is an eccentric bush rotatably disposed at the center of the external gear 1a.

The eccentric bushing is provided with a round square hole 4a that is inclined with respect to the axis of the eccentric shaft 3, and the square hole 4a is provided with a round square hole 4a that is inclined to the axis of the eccentric shaft 3.
b is slidably fitted, and a cam mechanism is formed by the eccentric bushing number and the cam portion 3b. The bracket 1 and the bracket 2 are rotatably connected to each other via an eccentric shaft 3 and an eccentric bushing, and the external gear 1a and the internal gear 2a are partially meshed. The flange portion 4b of the eccentric bushing 4 is disposed between the brackets 1 and 2, and the bushing 4 is set so as not to move in the axial direction of the eccentric shaft 3. Further, the position and inclination of the square hole 4a are set so that the clearance of the meshing portion between the gear 1a and the internal gear 2a increases or decreases as the eccentric shaft 3 moves in the axial direction.

5 is a handle for rotating the eccentric shaft 3, and 6 is a coil spring disposed between the handle 5 and the bracket 2. Due to the elasticity of the coil spring 6, the eccentric shaft 3
is constantly biased in the direction of arrow P in FIG. 7.8 is configured to prevent the brackets 1 and 2 from being separated by a stopper pin/-1'$1) and a stopper pin 8 fixed to the brackets 1 and 2.

Next, the operation of the apparatus configured as described above will be explained. In the state shown in FIG. 2, the coil spring 6
The eccentric shaft 3 is biased in the direction of arrow P. For this reason, the bracket 1 is urged in the direction of the interlocking portion of the external gear 1a and the internal gear 2a via a cam mechanism consisting of the cam portion 3b and the eccentric bushing. Therefore, in the state shown in FIG. 2, the clearance between the meshing portions of the external gear 1a and the internal gear 2a is extremely small, and the relative angles of the brackets 1 and 2 are fixed without any play.

The handle 6 resists the elastic force of the coil spring 6.
When pressed in the direction of arrow Q, the eccentric shaft 3 moves in the direction of arrow Q, and the bracket 1 moves via the cam mechanism in a direction that increases the clearance between the meshing portion of the external gear 1a and the internal gear 2a.

In other words, when the handle 5 is pressed in the direction of the arrow Q, the clearance increases and the external gear 1a can smoothly swing and rotate relative to the internal gear 2a. Therefore, when the handle 5 is rotated while being pressed, the eccentric bushing rotates and the external gear 1a smoothly swings and rotates.
The meshing position between a and the internal gear 2a moves sequentially, and the handle 5
The relative angle between the bracket 1 and the bracket 2 with respect to the eccentric shaft 3 is adjusted steplessly according to the rotational speed of the bracket 1 and the difference in the number of teeth between the external gear 1a and the internal gear 2a.

Further, when the angle adjustment is completed and the operation of the handle 5 is released, the eccentric shaft 3 is moved by the coil spring 6 in the direction of arrow P in FIG. For this reason, the external gear 1a and the internal gear 2
The clearance of the meshing portion with a is reduced, and the relative angle between bracket 1 and bracket 2 is fixed again without play.

In the above-mentioned embodiment, the cam mechanism consisting of the cam part 3b and the bushing number is disposed between the eccentric shaft 3 and the external gear 1a, but for example, as shown in FIG. , a cam mechanism can also be arranged between the eccentric shaft 3 and the internal gear 2a. Furthermore, in the above embodiment, the coil spring 6 is disposed between the bracket 2 and the handle 5, but the eccentric shaft 3 may be replaced by a bling member or by disposing the spring member. It is also possible to change the position.

As is clear from the above description, in the angle adjusting device of the present invention, the eccentric shaft connecting the external gear and the internal gear is movable in the axial direction, and a cam is provided between the eccentric shaft and one of the gears. A mechanism is provided to change the amount of eccentricity of both gears by moving the eccentric shaft, increasing or decreasing the clearance of the meshing part of both gears, making it easy to set the clearance and process each part. , no rattling,
Moreover, it is possible to realize an angle adjustment device that operates smoothly.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing a conventional example. FIG. 2 is a partially sectional front view showing an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a partially sectional front view showing another embodiment of the present invention. [Explanation of symbols] 1.2... Bracket, 1a... External gear,
2a... Internal gear, 3... Eccentric shaft, 3b...
...Cam part, number...Eccentric bushing 4a...
・1 square hole, 5---・e handle 6s meeting e *, a
coil spring. Patent applicant Le I Do A

Claims (1)

[Claims] 1. An external gear and an internal gear with the same pitch as the external gear and a slightly larger number of teeth are connected by an eccentric shaft, and one gear is oscillated relative to the other gear by rotation of the eccentric shaft. In the angle adjusting device using a differential speed reduction mechanism, the eccentric shaft is movable in the axial direction, and a cam mechanism is disposed between the eccentric shaft and one gear, and the eccentric shaft is movable in the axial direction. The clearance between the meshing portions of one gear and the other gear increases or decreases through the cam mechanism as the gear moves, and means is provided for biasing the eccentric shaft in a direction in which the clearance decreases. Angle adjustment mechanism characterized by its configuration. 2. A cam mechanism is constructed by forming a cam part on the eccentric shaft, providing a hole in the eccentric bushing that is inclined with respect to the axis of the eccentric shaft, and slidingly fitting the cam part into the hole in the eccentric bushing. An angle adjustment device according to claim 1.