JPH0242066Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to a friction clutch structure for a small motor used, for example, in a motor for opening and closing an electric sunroof of an automobile.

(Prior art) Conventionally, for example, as the above-mentioned small motor, the fourth
There was one shown in Figures and Figure 5.

That is, the small motor 100 has an armature shaft 10
a gear reduction mechanism 102 that decelerates the rotation of the output shaft 103; and a friction clutch mechanism 102 that blocks the rotation of the output shaft 103.
04.

The gear reduction mechanism 102 includes a worm 105 attached to the armature shaft 101 and a worm wheel 106 that meshes with the worm 105.

The friction clutch mechanism 104 blocks rotation of the worm wheel 106 toward the output shaft 103.

That is, the friction clutch mechanism 104 includes a disc plate 107 that rotates together with the worm wheel 106, friction plates 108 and 109 that rotate together with the output shaft 103 while sandwiching the disc plate 107, a disc spring 110, a felt washer 111, A washer 112, a collar 113, and a lock washer 114 are inserted into the output shaft 103, and a nut 115 is screwed onto the output shaft 103.

The disk plate 107 has protrusions 107b, 107 that hang downward in FIG.
apertures 106a, 106 provided with the protrusions 107b, 107b on the worm wheel 106;
worm wheel 106 by inserting it into a.
It is designed to rotate with the

That is, when this small motor 100 is used, for example, to open and close an electric sunroof in a car, when the electric sunroof reaches both end positions and the output shaft 103 is restrained, the disk that rotates together with the worm wheel 106 plate 10
7 slides against friction plates 108 and 109 to prevent restraint torque from being applied to worm wheel 106.

(Problems to be Solved by the Invention) However, in the conventional friction clutch holding structure for a small motor as described above, the disk plate 107 needs to be polished on both sides.
The shape with the protruding pieces 107b, 107b has the problem of making it difficult to polish and increasing the working time.
Therefore, when manufacturing the disk plate 107, there was a problem that a lot of waste material was produced and the material was wasted.

(Purpose of the invention) Therefore, this invention was devised to solve the above-mentioned conventional problems.It reduces the number of man-hours involved in parts production, improves work efficiency, and makes effective use of materials. The purpose of this invention is to provide a friction clutch holding structure for a small motor that can achieve this, and has been specially devised.

[Structure of the idea]

(Means for solving the problem) The friction clutch holding structure for a small motor according to this invention is a small motor equipped with at least a gear reduction mechanism consisting of a worm and a worm wheel, and a friction clutch mechanism consisting of a friction plate and a disk plate. In this, the outer circumference of the disk plate is formed into a non-circular shape, and the inner circumferential surface shape of the worm wheel that accommodates the disk plate is made into a similar shape that is slightly larger than the outer circumferential shape of the disk plate, and the disk plate is formed into a non-circular shape. It is characterized by being fitted and held in the worm wheel in a non-rotatable manner.

(Example) An example of the friction clutch holding structure for a small motor according to this invention will be described below in Figures 1 to 3.
This will be explained based on the diagram.

That is, a small motor 1 showing an embodiment of this invention includes a gear reduction mechanism 4 consisting of a worm 2 and a worm wheel 3, and friction plates 5, 6.
and a friction clutch mechanism 8 consisting of a disc plate 7 and a disc plate 7.

Then, the rotation of the armature shaft 9 is controlled by the rotation of the armature shaft 9.
The rotation of the worm wheel 3 is transmitted via the worm 2 attached to the output shaft 10 to the worm wheel 3 inserted through the output shaft 10, and the rotation of the worm wheel 3 is transmitted to the output shaft 10 via the friction clutch mechanism 8.

The worm wheel 3 is formed into a bottomed cylindrical shape capable of accommodating the friction clutch mechanism 8, and its bottom wall 3a is provided with a through hole 3b through which the output shaft 10 can be inserted.
In this embodiment, the inner peripheral surface 3c has a regular octagonal shape.

The output shaft 10 is supported at both ends by a bearing 12 provided on the motor casing 11 and a bearing 14 provided on the cover 13, and an output gear 15 is attached to the outer portion of the motor casing 11. Also,
The output shaft 10 has an oval cross-sectional shape on the side opposite to the side on which the output gear 15 is attached, and a male threaded portion 1 is attached to the outer periphery of the tip of the oval-shaped portion 10a.
0b is provided.

The friction clutch mechanism 8 includes friction plates 5 and 6.
It is mainly composed of a disc plate 7 and a disc spring 16, and with the disc plate 7 sandwiched between the friction plate 5 and the friction plate 6,
A disc spring 16 is brought into contact with the friction plate 5, and a felt washer 17, a washer 18, and a collar 1 are attached.
9 and the nut 21 via the lockwasher 20
is screwed onto the male threaded portion 10b of the output shaft 10.

The friction plate 5 is provided with a crimping portion 5a on the side of the disk plate 7, which is made of fluorocarbon resin (for example, Teflon (trade name)) and is baked onto the output shaft 10.
The output shaft 10 has an opening 5b that engages with the oval-shaped portion 10a, and rotates together with the output shaft 10.

The friction plate 6 is equipped with a crimped part 6a on the side of the disk plate 7, and has an opening 6b that engages with the oval-shaped part 10a of the output shaft 10. It is designed to rotate together with 10.

The output shaft 10 is attached to the disk plate 7.
The outer periphery of the disk plate 7 is
It is formed into a similar shape that is slightly smaller than the shape of the inner circumferential surface 3c of the worm wheel 3, that is, a regular octagonal shape in this embodiment.

That is, when the output shaft 10 is inserted into the through hole 3b of the worm wheel 3, the friction plate 5 is locked to the output shaft 10, the disc plate 7 is inserted into the output shaft 10, and the disc plate 7 is attached to the worm wheel 3. The friction plate 6 is fitted and held, and then the friction plate 6 is locked to the output shaft 10. Then, the disc spring 16, the felt washer 17, and the washer 18
By inserting the collar 19 and the locking washer 20 into the output shaft 10 and screwing the nut 21 onto the male threaded portion 10b of the output shaft 10, the output shaft 10 and the worm wheel 3 are rotated with respect to the rotating disk plate 7. The rotating friction plates 5 and 6 are both in a crimped state. Therefore, the worm wheel 3 and the output shaft 10 are connected via the friction clutch mechanism 8, and the rotation of the worm wheel 3 is transmitted to the output shaft 10.

For example, when the output shaft 10 is restrained, the disk plate 7 slides against the friction plates 5 and 6 to prevent restraint torque from being applied to the worm wheel 3.

Here, the disk plate 7 has hanging protrusions 107b, 107b like the conventional one shown in FIG.
Since the disc plate 7 has a flat plate shape, it is extremely easy to polish both sides of the disk plate 7, and moreover, the polishing can be performed on both sides in one step. Therefore, the number of man-hours for manufacturing parts can be reduced and work efficiency can be improved.

Further, the disc plate 7 has projecting pieces 107b, 1
Since the structure does not have 07b, waste materials are reduced and materials can be used effectively.

In one embodiment of the friction clutch holding structure for a small motor according to this invention, the shape of the inner peripheral surface 3c of the worm wheel 3 and the outer periphery of the disk plate 7 that is fitted and held in the worm wheel 3 are each formed into a regular octagonal shape. However, these shapes are not limited to regular octagons, and may be polygons or ellipses. That is, the outer peripheral shape of the disk plate and the inner peripheral surface shape of the worm wheel may be non-circular.

[Effect of idea]

As explained above, the friction clutch holding structure for a small motor according to this invention can be applied to a small motor equipped with at least a gear reduction mechanism consisting of a worm and a worm wheel, and a friction clutch mechanism consisting of a friction plate and a disk plate. , the outer circumference of the disk plate is formed into a non-circular shape, and the inner circumferential surface shape of the worm wheel that accommodates the disk plate is made into a similar shape that is slightly larger than the outer circumferential shape of the disk plate, and the disk plate is formed into a non-circular shape. Since the disc plate is non-rotatably fitted into the wheel, it is much easier to polish both sides of the disc plate compared to conventional methods.Moreover, this double-sided polishing can be done in one step, making it easier to manufacture parts. Reduces man-hours and improves work efficiency. Furthermore, the structure of this disk plate has an excellent effect in that less waste material is produced during its manufacture, and materials can be used more effectively.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a small motor illustrating a friction clutch holding structure for a small motor according to an embodiment of this invention, Fig. 2 is a cutaway side view of the small motor shown in Fig. 1, and Fig. 3 is a cross-sectional view of a small motor shown in Fig. 1. Fig. 1 is an external perspective view of each component to explain the friction clutch mechanism in the small motor shown in Fig. 1; Fig. 4 is a vertical sectional view of the small motor to explain the friction clutch holding structure of the conventional small motor;
FIG. 5 is an external perspective view of each component illustrating the friction clutch mechanism in the small motor shown in FIG. 4. 1...Small motor, 2...Worm, 3...Worm wheel, 3c...Inner peripheral surface, 4...Gear reduction mechanism, 5, 6...Friction plate, 7...Disc plate, 8...Friction clutch mechanism.

Claims (1)

[Scope of utility model registration request] In a small motor equipped with at least a gear reduction mechanism consisting of a worm and a worm wheel, and a friction clutch mechanism consisting of a friction plate and a disk plate, the outer periphery of the disk plate is formed into a non-circular shape, and the disk plate is housed. The friction of a small motor, characterized in that the inner circumferential surface of the worm wheel has a similar shape slightly larger than the outer circumferential shape of the disk plate, and the disk plate is fitted and held in the worm wheel in a non-rotatable manner. Clutch retention structure.