JPH0613985Y2 - Power Wind Regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention transmits the rotation output of a motor to a wire drum via a worm and a worm wheel, and raises and lowers a window glass by using a wire fed from the wire drum. Power window regulator that does.

(Prior Art) In a power window regulator, due to an imbalance of a motor load at the time of ascending and descending the window glass caused by the weight of the window glass, a difference occurs between the window glass rising speed and the window speed. Therefore, to eliminate the imbalance,
A torsion spring made by winding a long plate in a spiral shape is set so as to generate an urging force that raises the window glass, balance the motor load, and reduce the difference between the rising speed and the falling speed of the window glass. ing.

(Problems to be Solved by the Invention) In the case of the above configuration, the winding amount of the torsion spring needs to be large to some extent, and the spring constant needs to be a value capable of eliminating the imbalance. Therefore,
The torsion spring is made of a thin plate material to secure the amount of winding, and the axial width (thickness) of the torsion spring is increased to secure the spring constant. Therefore, the conventional device has a problem in that the window regulator cannot be made thin and the structure for setting the torsion spring becomes complicated. Further, the spiral torsion spring has a problem of high cost.

The present invention has been made in view of the above problems, and an object thereof is to realize a power window regulator which can be thinned, has a simple structure, and is low in cost.

(Means for Solving the Problems) The present invention which solves the above problems uses a wire fed from the wire drum by transmitting the rotation output of a motor to a wire drum via a worm and a worm wheel.
In a power window regulator that raises and lowers a window glass, an annular inner wall surface is formed in a housing that rotatably supports the worm wheel, and a torsion spring having a hook portion at one end thereof is inserted into the housing so as to be in pressure contact with the housing.
The hook portion is hooked on the worm wheel.

(Operation) In the power window regulator of the present invention, the braking force due to the torsion spring is unbalanced depending on the rotation direction of the worm wheel, and this is used to balance the motor load when the window glass is raised and lowered. Eliminate the difference between the rising speed and the falling speed of the glass.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.
1 to 5, reference numeral 1 denotes a motor which is a drive source of a power window regulator, and a worm 2 is attached to an output shaft 1a of the motor 1. A support shaft 4 whose end is supported by the housing 3 and a cap 11 thereof is provided in the housing 3, and a worm wheel 5 that meshes with the worm 2 and a pair of wire drums 7 and 8 rotate on the support shaft 4. It is possible to be stacked.

On the upper surface of the worm wheel 5 in FIG. 3, three recesses 5a are formed at equal intervals on a concentric circle centered on the support shaft 4, and the recesses 5a are formed on the lower surface of the wire drum 7 in FIG. The convex portion 7f formed in a similar positional relationship is loosely fitted, the cushion rubber 6 is fitted in the gap between the concave portion 5a and the convex portion 7f, and the worm wheel 5 and the wire drum 7 are inserted.
Are designed to rotate as a unit.

Notches (grooves) 7a, 8a on both side flanges are formed around the outer circumferences of the wire drums 7, 8 such that the wires are spirally wound in opposite directions (one is right-handed and the other is left-handed).
Is provided. The width of the cutouts 7a and 8a is selected to be slightly larger than the wire diameter of the wire 9. The wire drums 7 and 8 are provided with fitting holes 7b and 8b (which communicate with the insides of the cutouts 7a and 8a) for locking (caulking) the end 9b of the wire 9. There is. Circular grooves 7c and 8c and hook grooves 7d and 8d in the normal direction which communicate with the grooves are formed on the opposing surfaces of the wire drums 7 and 8. The torsion spring 10 bent as shown in FIG. 4 so that the hook portions at both ends are fitted in the hook grooves 7d, 8d is fitted in the circular grooves 7c, 8c of the wire drums 7, 8 arranged in layers. The wire drums 7 and 8 are constantly urged in the direction in which the wire 9 is wound.

Also, among the facing surfaces of the wire drums 7 and 8, the wire drum 7
A protrusion 7e is provided on the opposing surface of the wire drum 8, and an arc-shaped elongated hole 8e into which the protrusion 7e is loosely fitted is formed on the opposing surface of the wire drum 8. The fitting of the protrusion 7e and the elongated hole 8e is for restricting the relative rotation of the wire drums 7 and 8 within a certain angle.

On the surface of the housing 3 facing the worm wheel 5, an annular projection 3a concentric with the center of rotation of the worm wheel 5 is provided so as to project into the space 12 formed between the annular projection 3a and the worm wheel 5. , About 1 turn of the torsion spring 13 is inserted so as to come into pressure contact with the inner wall surface of the protrusion 3a. A hook portion 13a is provided at one end of the torsion spring 13, and the hook portion 13a is hooked in a hook hole 5b formed in the worm wheel 5.
The other end 13b is slightly bent inward.

According to the above configuration, when the motor 1 is started, the output shaft 1
The combination of the worm 2 connected to a and the worm wheel 5 meshed with the worm 2 reduces the rotation speed, and the wire drum 7 rotates. Then, for example, when the wire drum 7 rotates in the direction of the arrow in FIG. 4, the wire 9 is wound around the wire drum 7, and the wire 9 moves from the wire drum 8.
Is sent out and the window glass descends. On the contrary, when the wire drum 7 rotates in the direction opposite to the arrow, the window glass rises.
During this operation, the wire drums 7 and 8 relatively rotate so as to absorb the difference between the wire winding amount and the wire feeding amount of the wire drums 7 and 8.

When the window glass rises, the worm wheel 5 rotates clockwise in FIG. 1, but at this time, the hook hole 5b.
End surface A of the hook portion 13a of the torsion spring 13
Is pressed to reduce the outer diameter of the torsion spring 13. Therefore, the worm wheel 5 and the torsion spring 13 rotate integrally in a low friction state in which the pressure contact force of the projection 3a of the torsion spring 13 to the inner wall surface is reduced. On the other hand, when the window glass is lowered, the worm wheel 5 rotates counterclockwise in FIG. 1, but at this time, the end surface B of the hook hole 5b is located at the hook portion 13.
It acts to press a and increase the outer diameter of the torsion spring 13. Therefore, in a high friction state in which the pressure contact force of the projection 3a of the torsion spring 13 to the inner wall surface is increased,
The worm wheel 5 and the torsion spring 13 rotate integrally.

Therefore, according to the above configuration, the braking force (friction force) by the torsion spring 13 is set so that the motor load during the ascent and the motor load during the descent are equal, so that there is no difference between the ascending speed and the descending speed of the window glass. A window regulator can be realized. Here, the braking force by the torsion spring 13 can be easily increased or decreased by changing the number of turns, the outer diameter, and the wire diameter of the torsion spring 13 if the same material is used.

Further, the above-mentioned configuration is a simple configuration in which the torsion spring 13 is arranged so as to be in pressure contact with the inner wall surface of the protrusion 3a on the housing 3 and the hook portion 13a is hooked in the hook hole 5b of the worm wheel 5, It has a thin structure that does not take up space in the direction. In the case of this embodiment,
Since the wire 9 is wound around the wire drums 7 and 8 in a spiral shape, the length (axial direction) of the wire drums 7 and 8 is shortened,
The power window regulator can be made even thinner. Further, the torsion spring 13 of approximately one turn is cheaper than the conventional torsion spring in which a large number of long plate materials are wound in a spiral shape, and the cost can be reduced.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, without bending the end portion 13b of the torsion spring 13 inward, as shown in FIG. 5, chamfering (see FIG. 5 (a)) or oblique cutting (see FIG. 5 (b)) is performed. You may. However, the sliding durability is
The type slightly bent inward in FIG. 1 is the best. The present invention can be applied not only to the power window regulator of the type shown in FIG. 2 but also to other types of power window regulators such as a type in which a wire is wound around the outer periphery of a wire drum in a coil shape. Further, in this embodiment, the annular projection 3a is provided on the housing 3, but an annular groove may be provided instead of the projection 3a, and the torsion spring 13 and the worm wheel 5 may be provided in the groove.

(Effects of the Invention) As described above, according to the present invention, the braking force by the torsion spring can be unbalanced depending on the rotation direction of the worm wheel, and this can be used to raise and lower the window glass. It is possible to balance the motor load at the time and eliminate the difference between the rising speed and the falling speed of the window glass. Further, it is possible to realize a thin power window regulator which has a simple structure in which a torsion spring is inserted in pressure contact with an annular inner wall surface and a hook portion is hooked on a foam wheel, and which does not take up space in the axial direction. Further, since the torsion spring of the present invention can perform a desired function even if it has approximately one turn, it is cheaper than the conventional torsion spring in which a large number of long plate materials are wound in a spiral shape, and the cost is reduced. Can be achieved.

[Brief description of drawings]

1 is a sectional view showing a main part of an embodiment of the present invention (a sectional view showing a main part of a BB section in FIG. 3), FIG. 2 is a front view, and FIG. 3 is an AA section in FIG. 4 and 5 are exploded perspective views of the wire drum, and FIG. 5 is an explanatory view of a modification of the torsion spring. 1 ... Motor, 1a ... Output shaft 2 ... Worm, 3 ... Housing 3a, 7e ... Protrusion, 4 ... Support shaft 5 ... Worm wheel 5a ... Recess, 5b ... Hook hole 6 ... Cushion Rubber, 7, 8 ... Wire drum 7a, 8a ... Notch, 7b, 8b ... Fitting hole 7c, 8c ... Circular groove 7d, 8d ... Hook groove 7f ... Convex portion, 8e. Long hole 9 ... Wire, 9b ... End part 10, 13 ... Torsion spring 11 ... Cap, 12 ... Space 13a ... Hook part, 13b ... End part

Claims (2)

[Scope of utility model registration request] 1. A power window regulator for raising and lowering a window glass by transmitting a rotation output of a motor to a wire drum through a worm and a worm wheel, and rotating the worm wheel using a wire fed from the wire drum. A power window characterized in that an annular inner wall surface is formed in a movably supporting housing, a torsion spring having a hook portion at one end thereof is inserted into the housing so as to be in pressure contact, and the hook portion is hooked to the worm wheel. regulator. 2. The power window regulator according to claim 1, wherein the torsion spring has approximately one turn.