JPS5855462Y2 - Stepless tilt adjustment device - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to improve the inclination of reclining seats in vehicles,
The present invention relates to a tilt adjustment device for steplessly adjusting the tilt of a tilt steering wheel.

Conventionally, as this type of tilt adjustment device, for example,
As shown in Japanese Patent No. 16131, etc., a tilting member 8 is supported so as to be tiltable about the rotation axis of the bundle with respect to a fixed member, one end of a pair of driven plates is axially supported by the fixed member, and the other end is axially supported by the fixed member. It has been proposed that a wedge member is pushed into the end side to push and spread the driven plate, and a pair of friction plates are pressed against the inner peripheral surface of the cylindrical portion of the tilting member to fixedly support the tilting member in a predetermined position. However, the cam mechanism for inserting the wedge member between the pair of driven plates is complicated;
Not only does the overall thickness of the cylindrical part (the dimension in the central axis direction) increase, but when the wedge member is inserted into the driven plate, a large reaction force acts on the fixed member that supports the driven plate, which increases the strength of the fixed member. becomes a problem.

Furthermore, return springs are hung between the pair of friction plates to release the braking force, but these return springs are either placed on both sides of the driven plate to avoid interference with the driven plate, or If driven plates are not placed on both sides of the spring to sandwich the spring, there will be a problem that the posture of the friction plate will be unstable and smooth operation will be hindered.In the end, the structure will become complicated due to the above reasons, and the center of rotation will change as a whole. The axial dimension increases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a stepless tilt adjustment device that has a small number of parts, is easy to assemble, and is thin as a whole.

For this reason, the configuration of the present invention includes a fixed member, a tilting member rotatably supported by the fixed member with a support shaft and having a cylindrical portion, and a tilting member disposed inside the cylindrical portion and having a notch in the peripheral edge. a pair of semicircular driven plates, a pair of cams located between the pair of driven plates and rotatably supported by the fixed member, and the cams connected to each other by links.
an operating lever for rotating the pair of cams; a pair of return springs disposed between the pair of cams and hooked to the pair of driven plates; and a rolling element interposed in a gap between the cam and the cylindrical part, and the pair of driven plates are separated from each other by rotation of the cam by the operation lever, and the rolling element is caused to rub against the cylindrical part of the tilting member. It is designed to engage.

The structure of the present invention will be explained based on the drawings. As shown in FIG.
A fixing member 1B integrally provided with 8 a and a disk portion 6 at the base end.
a and a tilting member 6 are rotatably coupled to each other by a support shaft 15, and a cylindrical portion 11 coupled to the disk portion 6a.
is closed by the disk portion 18a, and a cam and a driven plate, which will be described later, are housed inside.

As shown in FIG. 2, a pair of left and right cam shafts 1 and 9 are rotatably supported on a disc portion 18H of the fixed member, and disc cams 1a and ga are supported on this. Further, the levers 3 and 10 are connected to each other by a link 7 through a pin 2.8. The cams 1a and ga are each rotated.

A pair of upper and lower pins 19.16 are also fixedly supported on the disc portion 18a, and approximately semicircular driven plates 21.13 each having an elongated hole 20.17 that engages with these are supported. The straight side edges of each driven plate 21.13 are formed into cams 1a by a pair of suspended springs 14.

9a, respectively.

A notch 23, 24 is provided in the peripheral edge of each driven plate 21, 13, into which a rolling element such as a roller or ball 12 is engaged and can be moved along the inner surface of the cylindrical part 11. There is.

A return spring 4 is suspended between the lever 3 and the support shaft 19.

To explain the operation of the tilt adjustment device according to the present invention,
If the operating lever 10a is rotated about 30 degrees counterclockwise from the state shown in FIG. 2, the valleys of the cams 1a and ga will abut against the side edges of the respective driven plates 2i and 13. The balls 5, 12, which were pressed against the cylindrical part 11 by the peripheral edge of the driven plate 21.13, are now released.

Therefore, the cylindrical portion 11 can be rotated together with the tilting member 6 by an arbitrary angle about the support shaft 15.

Next, by rotating the operating lever 10a clockwise,
Since the peaks of the cams 1a and ga engage with the side edges of the driven plates 21.13 and move the driven plates 21.13 radially outward against the spring 14, the peripheral edges of the driven plates 21.13 and cylindrical part 1
The ball 5.degree. 12 is firmly frictionally engaged with the inner circumferential surface of the fixing member 1B, and the tilting member 6 is fixed at a desired inclination with respect to the fixed member 1B.

As mentioned above, the operation lever 10a is tightened by the cylindrical portion 11 and the driven plates 21, 1 supported by the fixed member.
For example, when a clockwise torque is applied to the tilting member 6 in FIG.
The notch 2 is wedge-engaged with the inner circumferential surface of the notch 2 to prevent the tilting member 6 from tilting.
The balls 5 and 12 of No. 4 wedgely engage with the inner peripheral surface of the cylindrical portion 11 to prevent the tilting member 6 from tilting.

FIG. 3 shows an application example in which the tilt adjustment device according to the present invention is attached to the chiller 1 to the steering wheel.

That is, the steering shaft 32 coupled to the steering gear mechanism 31 is
It is rotatably supported by a steering column 33 fixed to the vehicle body with a mounting member 35, and the upper end of this steering shaft 32 is rotatably coupled to a shaft 34a of a handlebar 34 through a known universal joint.

The support shaft 15 is arranged so as to coincide with this joint, and the fixed member 1B is fixed to the steering column 33, and the tilting member 6 is fixed to the column 36 that supports the steering wheel shaft 34a. handle 34
can be adjusted and fixed at any angle as shown by the chain line.

FIG. 4 shows an example of application of the device of the present invention to a reclining seat, in which the fixed member 18 is fixed to the seat 37, the tilting member 6 is fixed to the back plate 38, and the back plate is moved by operating the operating lever 10a. 3B can be adjusted and fixed at any inclination around the support shaft 15.

As described above, the present invention supports a pair of driven plates forming an approximately semicircular shape with respect to a fixed member, and a pair of disc cams rotated by an operating lever are arranged between them. The diameter of the disc cam can be made larger, which makes it possible to reduce the amount of displacement of the driven plate relative to the amount of rotation of the operating lever, that is, the ratio of change in the braking force exerted by the ball on the cylindrical portion, resulting in smoother operation. In addition, there is no possibility that the cam will be rotated in the opposite direction in response to an external force acting on the tilting member.

In addition, since the spring that urges and engages the driven plate with the cam is hooked up between the pair of cams, it can be arranged very compactly, which reduces the overall thickness of the device. In other words, the dimension in the rotational axis direction can be reduced.

Further, compared to the conventional example, the number of parts is smaller and assembly is easier, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a side view of a stepless tilt adjustment device according to the present invention, FIG. 2 is a front sectional view of the same device, and FIGS. 3 and 4 are side views showing application examples of the device of the present invention. 1.9: cam shaft, 1a, ga: cam, 5: ball, 6:
Tilting member, 7: Link, 10a: Operation lever, 11: Cylindrical portion, 12: Ball, 13: Follower plate, 15: Support shaft, 18
: Fixed member, 18a: Disk portion, 21: Driven plate, 23: Notch, 24: Notch.

Claims (1)

[Scope of utility model registration request] a fixed member, a tilting member rotatably supported by the fixed member with a support shaft and having a cylindrical portion, and a pair of driven members disposed inside the cylindrical portion and having a substantially semicircular shape and having a notch in the peripheral edge. a plate, a pair of cams located between the pair of driven plates and rotatably supported by the fixed member, an operation lever for rotating the pair of cams connected to each other by a link, and a pair of return springs located between the pair of cams and hooked to the pair of driven plates; and a rolling element interposed in the gap between the notch of the driven plate and the cylindrical portion of the tilting member. A stepless tilt adjustment device, wherein the pair of driven plates are separated from each other by rotation of the cam by the operating lever, and the rolling element is frictionally engaged with the cylindrical portion of the tilting member.