JPH0324790Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a drive device having a brake spring. More specifically, the present invention relates to a drive device having a brake spring that can be particularly used as a drive device for a wind regulator, and which is improved so as to prevent the occurrence of stick slip accompanied by abnormal noise.

Conventionally, a driven device 33 such as a window regulator shown in FIGS. 5 and 6 can be remotely controlled by rotating a drive device 31 (for example, operating a crank handle 32 in the direction of arrow A or B). 34, a brake spring 6 as shown in FIG. 7 is incorporated so that the driven device 33 can be operated from the drive device 31 side, but the driven device 33 cannot be moved directly from the outside. A drive device 31 is employed.

This is driven by a handle 32 and a follower 33.
When operating the brake spring 6, the outer diameter of the brake spring 6 is reduced so that the operation is not hindered.
Conversely, even if an attempt is made to directly move the window glass 34 of the driven device 33, it cannot be moved due to the frictional force between the brake spring 6, which expands in outer diameter, and the casing 1. Therefore, it is possible to prevent the window glass 34 from being forced open by external force or from sliding down due to vibration.

However, such a driven device 33 produces an unpleasant noise when the window glass 34 is lowered by rotating the handle 32 in the direction of arrow B from a fully closed state in which the window glass 34 is pressed against the upper crosspiece 37. The disadvantage is that it occurs.

Therefore, the inventor of the present invention has conducted intensive research to eliminate the above-mentioned drawbacks, and as a result has discovered the completely new fact that the above-mentioned abnormal noise is caused by the states-slip phenomenon described below.

That is, when the window glass 34 in FIG. 5 is pressed against the upper crosspiece 37 and a rotational force is applied to the handle 32 in the direction of arrow A, the arm 35 is bent (see the two-dot chain line in FIG. 5), or Excessive tension is generated in the wire 36 in FIG. 6, and after the handle operation is stopped, the elastic restoring force based on the deflection or tension causes the driven member, the pulley 5 or the gear 38, to rotate in the direction of arrow B. try to make it happen. Therefore, the outer diameter of the brake spring 6 expands, and the inner wall surface 1a of the casing 1
Since it is in close contact with the restoring force and the frictional force, it becomes locked at a position where the restoring force and the frictional force are balanced, that is, it becomes a stuck state. In such a state, the arm 3
5 or wire 36 stores elastic energy. Therefore, when the handle 32 is rotated in the direction of arrow B in order to lower the window glass 34, the end face 2b of the notch 2 engages with the corresponding bent part 8, loosening the brake spring 6 and reducing its outer diameter. The so-called stick-slip phenomenon occurs in which the stored elastic energy is released all at once, and the released energy impacts various parts, causing vibrations and noise.

As a result of further research in order to fundamentally eliminate the above-mentioned causes, the inventor of the present invention has developed a casing having a cylindrical inner wall surface, a casing provided concentrically and rotatably within the casing, and a a drive member having a fan-shaped notch and a handle fixed to one end thereof; and a drive member provided concentrically and rotatably within the casing adjacent to the drive member, and adjacent to the drive member. a driven member having a fan-shaped protrusion on a side surface thereof that can engage with the notch; and a driven member that is inserted into the inner wall surface of the casing so that its outer periphery is in close contact with the inner wall surface of the casing, and radially inwardly formed at both ends of the driven member. The bent portion has a coil-shaped brake spring interposed between a radial end surface of the notch portion and a radial end surface of the protrusion, and the bent portion has a coil-shaped brake spring interposed between a radial end surface of the notch portion and a radial end surface of the projection portion, and the A recessed portion capable of accommodating the bent portion is formed, and a gap is provided between the surface of the bent portion accommodated in the recessed portion and the one end surface so that the bent portion can move in the circumferential direction. The fact that when using a drive device having a brake spring characterized by this, the brake spring does not become stuck when the window glass is pressed against the crosspiece with normal force, and the generation of abnormal noise can be prevented. This led to the completion of this invention.

Next, the drive device of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of essential parts showing an embodiment of the drive device of the present invention, FIG. 2 is a longitudinal sectional view of the embodiment shown in FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. Fourth
The figure is a graph showing a comparison of abnormal noise generation areas in the conventional drive device and the drive device of the present invention.

In FIG. 1, reference numeral 1 denotes a cylindrical casing with a bottom having a flange portion 1b for fixing to a door panel of an automobile, etc., and an inner wall surface 1a of the casing 1 is formed into a cylindrical shape. Casing 1
There is a bottomed cylindrical driving member 3 having a shaft 10 inside.
are housed concentrically, one end of the shaft 10 is rotatably fitted into a bearing hole 1c at the bottom of the casing 1, and a handle 32 is fixed thereto. The other end of the shaft 10 is rotatably supported by a door panel or cover (12 in FIG. 2) to which the flange portion 1b is attached. A pulley 5, which is a driven member, is rotatably fitted to the other end of the shaft 10. A fan-shaped notch 2 is formed in a part of the outer periphery of the drive member 3, and a fan-shaped protrusion that can engage with the notch 2 is provided on the side of the pulley 5 adjacent to the drive member 3. 4 is provided. The inner wall surface 1a of the casing 1 and the outer peripheral surface 3 of the drive member 3
A coil-shaped brake spring 6 that is in sliding contact with the inner wall surface 1a is interposed between a, and both ends of the brake spring 6 are bent inward in the radial direction, and both end surfaces 2a, 2 of the notch 2 are bent.
b, and bent portions 7 and 8 that can engage with the end surfaces 4a and 4b of the protrusion 4. Further, on one end surface 2a of the notch portion 2, that is, the end surface 2a on the side that receives the elastic repulsion force when the operation of the driven device in one direction reaches the end, there is a recessed portion 11 that accommodates the bent portion 7. It is formed. As shown in FIG. 3, the recess 11 is formed to a depth D,
The depth D is a depth that accommodates the bent portion 7 and further forms a gap Y between the surface of the bent portion 7 and the end surface 2a that is large enough to move the bent portion 7 of the brake spring 6 having a wire diameter d. It is.

Next, the operation of the drive device of the present invention constructed as described above will be explained.

When the shaft 10 is rotated in the direction of arrow A as shown in FIG. , and pull the bent portion 7 of the brake spring 6 in the direction of arrow A. In this case, since the brake spring 6 is driven in a direction that reduces its outer diameter, rotation of the pulley 5 is not hindered. When such rotational drive is stopped, for example, when the upper edge of the window glass 34 and the crosspiece 37 come into contact with each other in FIG. The drive member 3, brake spring 6, and pulley 5 are rotated in the direction of arrow A by an amount corresponding to the elastic elongation that occurs. In this state, when the rotational force of the handle 32 in the direction of arrow A is relaxed, a gap Y remains between the end surface 4a of the protrusion 4 and the bent portion 7 of the brake spring 6, so that the pulley 5
It is possible to return by the distance of the gap Y in the direction of arrow B without being hindered by. Therefore, in the drive device of the present invention, it is equivalent to tightening the window glass with a smaller operating force corresponding to the amount of elastic deformation of the driven member corresponding to the gap Y.
The stay between the brake spring 6 and the inner wall surface 1a is relaxed. Therefore, when the handle is next rotated in the direction of arrow B, the operation can be performed smoothly without generating any abnormal noise.

Furthermore, in the drive device of the present invention, the handle 3
2 with a much larger force than normally used to press the window glass 34 against the crosspiece 37, the gap Y is not sufficient to eliminate the elastic repulsive force, and the remaining elasticity There are cases where the energy causes abnormal noise. Therefore, from another perspective, the noise prevention effect of the present invention can be said to be an effect of increasing the lower limit of the noise generation area, as shown in FIG.

That is, as shown in Fig. 4, the horizontal axis represents the handle operating force (the corresponding wire tension and the force acting on the brake spring are shown below the horizontal axis), and the vertical axis represents the elastic deformation of the pulley 5, which corresponds to the elastic deformation of the driven device. On the coordinates that measure the amount of movement in the circumferential direction, the amount of elastic deformation increases in proportion to the steering force.
With the conventional drive device, the steering force is 8Kgf.
If abnormal noise occurs in the above case, by setting the gap to 1.5 mm, the lower limit of abnormal noise generation will be approximately
This means an increase of approximately 5.5Kgf to 13.5Kgf. Therefore, considering that the normal operating force is 10 kgf and the average maximum operating force is about 12 kgf, the generation of abnormal noise can be practically completely prevented.

In the graph of Figure 4, R ₁ indicates the abnormal noise generation area in the conventional drive device, and R ₂ indicates the abnormal noise generation area in the drive device of the present invention. Stakes do not occur from the state where the brake spring 6 and the inner wall surface 1a are in contact with a light contact pressure to the time when the brake spring 6 is in strong contact with the inner wall surface 1a from its end, and the casing It is believed that this is because there is enough time for the tensile stress in the brake spring 1 and the compressive stress in the brake spring 6 to increase. Note that R ₃ in FIG. 4 indicates the range of normal operating force when the window glass is smoothly rising or lowering, and R ₄ indicates the range of normal operating force when closing the window.

On the other hand, an external force that lowers the window glass 34 when the drive member 3 is not rotationally driven in the direction of arrow B;
Alternatively, when an external force is applied to raise the brake spring 6, the end surface 4a of the protrusion 4 tries to rotate the brake spring 6 in the direction in which its outer diameter expands. Frictional force acts between them, and a braking effect can be achieved similar to a conventional drive device (eg, the one shown in FIG. 7).

Furthermore, when rotating the drive member 3 in the directions of arrows A and B, the end surfaces 2a and 2b of the notch 2 rotate the brake spring 6 in the direction in which its outer diameter is reduced. It can be rotated in the A and B directions.

Furthermore, when the drive device of the present invention is applied to the pull wire drive type wind regulator shown in FIG. Therefore, it is possible to prevent abnormal noises caused by shaking of the wire due to vibrations of automobiles, etc.

That is, when the brake spring 6 is locked with excessive tension being generated in the lifting wire 36a wound around one side of the wire 36 wired in a loop as shown in FIG.
The lowering wire 36b unwound on the other side is loosened, and vibrations from the outside may cause the wire to shake and touch surrounding objects, producing noise. When the driving device of the present invention is adopted, the pulley 5 returns in the direction of arrow B, so that the tension on the one side 36a is reduced, and at the same time, the tension on the other side 36a is reduced.
The looseness of 6a is eliminated. This has the effect of preventing the generation of abnormal noises due to the shaking of the wire.

In addition, in the embodiments shown in FIGS. 1 to 3, the cutout part 2
A recess 11 is formed in one end surface 2 of the
A bent portion 7 is provided on both end surfaces 2a and 2b, respectively.
Recesses (11 and 11a in FIG. 1) corresponding to 8 may be formed so that the driven device can be stopped at the stop position of the rotation of the pulley 5 in both directions without residual elastic energy.

Further, although the pulley 5 is used as the driven member in the above embodiment, the same effect (elastic energy is not accumulated in the lever 35) can be obtained even if a gear 38 as shown in FIG. 5 is used as the driven member.

As mentioned above, the drive device with the brake spring of the present invention can fundamentally solve the problem of generating abnormal noise that has conventionally caused discomfort to passengers, and its practical value is extremely large. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing an embodiment of the drive device of the present invention, FIG. 2 is a longitudinal sectional view of the embodiment shown in FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. Fourth
The figure is a graph showing a comparison of abnormal noise generation areas in a conventional drive device and the drive device of the present invention, and FIGS. 5 and 6 are a schematic front view of a wind regulator using the conventional drive device, respectively. FIG. 7 is a perspective view of the main parts of a conventional drive device. Main symbols in the drawings: 1...Casing, 1a...
Inner wall surface, 2... Notch, 3... Drive member, 2
a, 2b... end face of the notch, 4... protrusion,
5...Pulley, 6...Brake spring, 7,
8...Bending portion, 9...Outer peripheral surface, 11...Concave portion, D...Depth of concave portion, d...Wire diameter of spring, Y...Gap.

Claims (1)

[Scope of utility model registration request] a casing having a cylindrical inner wall surface; a casing provided concentrically and rotatably within the casing;
a drive member having a fan-shaped notch on its outer periphery and a handle fixed to one end thereof; a driven member having a fan-shaped protrusion that can engage with the notch on a side surface adjacent to the member; and a radial direction formed at both ends of the driven member, which is inserted so that its outer periphery is in close contact with the inner wall surface of the casing. The inwardly bent portion has a coil-shaped brake spring interposed between a radial end surface of the notch and a radial end surface of the protrusion, and at least one of the end surfaces of the notch A recessed portion capable of accommodating the bent portion is formed on one side, and a gap large enough to allow the bent portion to move in the circumferential direction is formed between the surface of the bent portion accommodated in the recessed portion and the one end surface. A drive device comprising a brake spring.