JPS6272936A - Driving device provided with brake mechanism - Google Patents

Abstract

PURPOSE:To aim at the prevention of backlash at the driven side and miniaturization, by making braking force so as to work when load acts on a turning shaft at the driven side by means of both large and small diametral springs installed between turning shafts at both driving and driven sides. CONSTITUTION:Two springs 3 and 4 different in diameter each are housed in a housing, and the large diametral spring 3 on one side is set up in an inner wall of the housing 1 while the small diametral spring 4 on the other in an outer circumference of a bearing tube 2 unitized with the housing 1, respectively, so as to be pressed to each part. In an interspace between hook parts 3b and 4b on one side of both these springs 3 and 4, the pressing piece 6 installed in a turning shaft 7 at the driving side supported by the bearing tube 2 is installed so as to come into contact with the space with proper play. In addition, hook parts 3a and 4a on the other side are set up as engaged with a bending piece 9a of a turning shaft 8 whose tip end 8a is pivontally supported in a shaft hole 7a of the turning shaft at the driving side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive device equipped with a brake mechanism suitable for adjusting the height of an automobile seat or the like and fixing it at an arbitrary position 1n.

[Prior Art] A brake structure that uses a torsion spring, presses the torsion spring against a fixed case, and performs braking by the frictional force is disclosed in Japanese Utility Model Publication No. 57-12153, Japanese Unexamined Patent Publication No. 56-1.24522, Jitsukai Showa 59
It is publicly known from, for example, Japanese Patent No.-46724.

[Problems to be Solved by the Invention] The above-mentioned publicly known Utility Model Publication No. 12153/1980 discloses that when a load is applied to the seat-side shaft (driven side), the brake is applied after a slight rotation when applied to a seat hide adjuster, etc. Therefore, this slight rotation causes play and discomfort.

Furthermore, the structure and adjustment of Japanese Patent Application Laid-Open No. 56-124-522 are complicated, and the minimum amount of play necessary for operation remains as play on the driven side, so it is not a perfect measure to prevent play.

Furthermore, ``2ki Utility Model Application Publication No. 59-4.6724'' is of the same type.
Since the springs of books are housed in parallel in the housing, the device becomes thicker and therefore larger.

In addition, it is necessary to control the brake release and action of the same spring by winding and expanding in the same direction, requiring precision in each part and assembly, and there are many design constraints. There is.

[Means for solving the problem] The present invention was invented in order to eliminate this problem in view of the above-mentioned circumstances. , one large diameter spring is brought into elastic pressure contact with the inner part of the housing 4:x in the normal state, and
On the other hand, the small diameter spring is wrapped around and pressed against the outer wall of the bearing cylinder provided in the housing. 4 Between one hook part of each of these springs, there is a pressing piece provided on the drive side rotating shaft which is supported in the bearing cylinder. The two bent parts were placed so that they abutted with appropriate play, and the tip of the other bent part was inserted into the shaft hole drilled on the lψ drive side rotating shaft, and the other bent part was placed so that it was locked to the flange of the rotating shaft that was received on the same axis. This is a drive device equipped with a brake mechanism that is unique in that it prevents rattling on the driven side and is compact.
Furthermore, the purpose is to simplify the configuration, and to create a configuration that does not require high precision in parts and assembly and has fewer constraints on design conditions.

[Sakukawa] In order to transmit the rotation of the driving side rotating shaft 7 to the driven side rotating shaft 8, when the driving side rotating shaft 7 is rotated in the direction C shown in FIG. The end of the pressing piece 6 provided on the sector-shaped collar 5 presses one hook portion 4b of the small-diameter spring 4 wound around the outer wall of the bearing tube 2 and acts in a direction to enlarge the diameter. This action releases the friction brake between the small diameter spring 4 and the bearing sleeve 2. When the drive-side rotation shaft 7 is further rotated in the direction C, the pressing piece 6 presses one end of the collar 9 provided on the driven-side rotation shaft 8.

The large-diameter spring 3 locked in the slit 10 of the bent piece 9a of the collar 9 is moved in the retracting direction to release the frictional force between the inner wall of the spring 3 and the housing 1, and the rotation of the drive-side rotating shaft 7 is prevented from being driven. Rotation is transmitted to the side rotating shaft 8, and both springs 3 and 4 follow and rotate by the collar 9.

Also, when the drive side rotating shaft 7 is rotated in the opposite direction b and the end of the pressing piece 6 presses the hook portion 3b of the large diameter spring 3,
The spring 3 is deformed in the winding direction, and the pressing piece 6
When it comes into contact with one end of the bent piece 9a of the collar 9 and rotates, the hook portion 4a of the small diameter spring 4, which is engaged with the sulin 1-10 of the collar 9, presses the spring in the expanding direction, and both springs 3
, 4 is released, and the rotation is transmitted to the driven side rotating shaft 8 for rotational operation. Next, when a rotational force of 41j is applied to the rotating shaft 8 on the driven side, the hook portions of both splinters are engaged with the slings 1 to 10; 3d.

4a expands the large diameter spring 3 when in the C direction in Fig. 1, and expands the small diameter spring 4 when in the C direction.
In either case, the braking force by the large diameter spring 3 or the small diameter spring 4 acts so that no rattling occurs.

[Embodiment] Reference numeral 1 denotes a housing, and a bearing sleeve 2 is integrally provided in the center of the housing toward the inside.

Two springs (torsion spring links) 3.4 with different diameters are accommodated in the housing 1, and one of the large diameter springs 3 has a hook portion J a with both ends bent inward.
l 13b is provided and housed in pressure contact with the inner wall of the housing in a normal state, and the other small diameter spring 4 is provided with hook portions 4a and 4b with both ends thereof bent outward, respectively, and is housed in the housing 1 in the same way. It is arranged so as to be wrapped around and pressed into contact with the outer periphery of the bearing tube 2.

A sector-shaped flange 5 is inserted into the bearing tube 2 at one end, and a drive-side rotating shaft 7 having a pressing piece 6 integrally provided in the flange 5 is inserted and rotatably supported. The pressing piece 6 of this rotating shaft 7 is
Hook portions 3b and 4b at one end of each of the springs 3 and 4
They are arranged so that they are in contact with each other with a suitable operating play between them.

In addition, a shaft hole 7a is provided in which the tip end 8a of the IvA driving side rotation shaft 7, which will be described later, is inserted and supported. One end of the 1ψ movable side rotating shaft 8 is bent, and this bent piece 9a is integrally provided with a collar 9 provided with a sling 1-10 for locking the hook portions 3a, 4a of the ++ff jQ springs 34. The distal end portion 8a is inserted into the shaft hole 7a and is supported by the shaft, and with the hook portions 3a and 4a locked in the slit 10, it is inserted into the bearing portion 12 provided on the frame 11 and is supported by the shaft. The housing 1 incorporating each of the above-mentioned members is attached to a frame 11. FIG. 5 shows another embodiment of the large diameter and small diameter springs, and the large diameter and small diameter springs 3, 4.
The upper hook portions 3a and 4a are integrally continuous.

This is a spring I with double winding inside and outside. In this case, the continuous bent portion at the top is engaged with a slit 10 provided in the bent piece 9a of the collar 9.

FIG. 6 shows another embodiment of the driven side rotating shaft, with a slit loa provided in the bent piece 9a of the collar 9 of the driven side rotating shaft.
, Ob are provided at the hollow locations to engage the upper bent hook portions of the respective springs 3 and 4.

C-9! As described above, the present invention has a large diameter spring and a small diameter spring each having a bent portion at its end, and one of the large diameter springs is brought into elastic pressure contact with the inner wall of the housing in a normal state. ,
On the other hand, the small-diameter spring is wound around and pressed against the outer wall of the bearing tube provided in the housing, and between one bent portion of each of these springs is a pressing piece provided on the drive-side rotating shaft that is bearing in the bearing tube. The tip of the other bent part is inserted into the shaft hole drilled in the drive-side rotating shaft, and the other bent part is placed with the flange of the rotating shaft held on the same axis at +hL. The drive bag Vt is equipped with a distinctive brake mechanism, and uses a large diameter spring and a small diameter spring, one of which is in pressure contact with the inner wall of the housing and the other with the outside of the bearing tube, and is attached to the rotating shaft on the driven side. When a load is applied, the braking force from either of them acts to prevent backlash.

In addition, the structure is simple, and high precision is not required for assembling each component, so there are fewer restrictions on the condition of one sinker, and the springs have large and small diameters, so they can be miniaturized.

[Brief explanation of drawings]

The drawings show an embodiment of a drive j device equipped with a brake mechanism according to the present invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is an exploded view, and Fig. 33 is a view taken along the line X-X in Fig. 1. Cross-sectional side view of, No. 4
The drawings are a cross-sectional side view taken along the line X--X in FIG. 1, FIG. 5 is a perspective view showing another embodiment of the spring, and FIG. 6 is a perspective view of another embodiment of the driven side rotating shaft. 1... Housing 2... Bearing tube 3.4... Large diameter small diameter spring 3a, 3b, 4a, 4b' Hook part
5・Brim 6・Press piece 7・Drive side rotating shaft 7d・
・Shaft hole 8... Driven side rotating shaft 9... Flange 9a Bending piece 10.10a, lob・
・・Slit 11・・Frame 12 Small outlet receiving part ■
) Spring patent applicant: Imasen Electric Manufacturing Co., Ltd.; Agent: Hideo Dohashi, Pa.
Goji Eto'□゛Pa: -1g'+'

Claims (1)

[Claims] It has a large diameter spring and a small diameter spring with a bent part at the end.One large diameter spring is in elastic pressure contact with the inner wall of the housing in the normal state, and the other small diameter spring is pressed against the inner wall of the housing. The springs are wrapped around and pressed into contact with the outer wall of the spring, and a pressing piece provided on the drive-side rotating shaft supported in the bearing sleeve is arranged between the bent portions of each of the springs so as to abut with an appropriate amount of play. , the other bent part is arranged such that the tip part is inserted into a shaft hole bored in the drive-side rotation shaft and is engaged with the flange of the rotation shaft received on the same axis. Device.