JPH087147Y2 - Friction clutch holding structure for small motors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a friction clutch structure for a small motor used as a motor for opening and closing an electric sunroof of an automobile, for example.

(Prior Art) Conventionally, for example, the small motors described above have been shown in FIGS. 4 and 5.

That is, the small motor 100 includes a gear reduction mechanism 102 that reduces the rotation of the armature shaft 101, and a friction clutch mechanism 104 that intermittently transmits the rotation to the output shaft 103.

The gear reduction mechanism 102 is an armature shaft 101 of a motor (not shown).
And a worm wheel 106 that meshes with the worm 105.

The friction clutch mechanism 104 intermittently transmits the rotation of the worm wheel 106, which constitutes a part of the gear reduction mechanism 102, to the output shaft 103. The friction clutch mechanism 104 rotates with the worm wheel 106, and the disc plate 107. It is mainly composed of friction plates 108 and 109 that rotate together with the output shaft 103 while sandwiching 107.

Disc plate 1 forming part of the friction clutch 104
07 is on both ends of the disk portion 107a that has been polished on both sides,
In FIG. 5, the projecting pieces 107b, 1 that hang downwards.
It has 07b.

Friction plate 1 forming part of the friction clutch mechanism 104
Of 08,109, the friction plate 108, the disc plate 1
On the contact side with 07, that is, in FIG. 5, there is provided a pressure contact portion 108a having asbestos attached to one surface on the lower side so as to rotate together with the output shaft 103.

On the other hand, the friction plate 109 is provided with a pressure contact portion 109a formed by baking fluororesin on the contact side with the disc plate 107, that is, the upper surface in FIG. 5, so that the friction plate 109 rotates together with the output shaft 103 like the friction plate 108. ing.

The worm wheel 106 has a through hole 106a through which the output shaft 103 can be inserted and a disc plate 107.
Opening 106 into which the projecting pieces 107b, 107b provided for
b and 106b.

That is, in the friction clutch holding structure for such a small motor 100, the opening 1 provided in the worm wheel 106 is used.
Protrusions 107b and 107 provided on the disc plate 107 on 06b and 10b.
With b inserted, the disc plate 107 rotates with the worm wheel 106. Then, as shown in FIG. 5, a friction plate 109 is provided below the disc plate 107.
With the pressure contact portion 109a of the disc plate 107 in contact with the pressure contact portion 108a of the friction plate 108 on the upper side of the disc plate 107, and the disc spring 110, the felt washer 111, the flat washer 112, the collar 113,
A nut 115 is screwed into the output shaft 103 via a lock washer 114.

Therefore, for example, when the small motor 100 is used for opening and closing the electric sunroof of an automobile, when the electric sunroof comes to both end positions and the rotation of the output shaft 103 connected to the sunroof lid is restricted, The disc plate 107 rotating together with the worm wheel 106 slides against the friction plate 108 and the friction plate 109, thereby preventing the worm wheel 106 from being subjected to restraint torque.

(Problems to be Solved by the Invention) However, in the conventional friction clutch holding structure of the small motor 100 as described above, the disc plate 107
Is required to be polished on both sides, but it is difficult to perform polishing with a shape including the protrusions 107b and 107b, and there is a problem that the working time is increased, and because of the protrusions 107b and 107b, the disc plate 107 has a problem. There was also a problem that a large amount of waste material was produced during production, and the material wasted.

Further, since the friction plates 108 and 109 are provided with the pressure-bonding portions 108a and 109a on one surface thereof, the working time is increased in addition to the above problems.

Therefore, the present invention was conceived in order to solve the above-mentioned conventional problems, and it is possible to reduce the number of man-hours involved in manufacturing parts and improve work efficiency, and to effectively use materials. With the aim of providing a friction clutch holding structure for a small motor capable of achieving the above, a special device is devised.

[Structure of the Invention] (Means for Solving Problems) A friction clutch holding structure for a small motor according to the present invention includes a worm connected to an armature of a motor and an opening formed in one surface in a non-circular shape. It has a through hole in the center, a worm wheel that is formed into a cylindrical shape with a bottom, and is driven to rotate by a worm, and a cylindrical part, and the tip part of this cylindrical part is integrally connected, and an external thread is provided on the outer peripheral part. An oval-shaped portion formed with a cylindrical shape and an output shaft having a cylindrical portion arranged in the through hole of the worm wheel, and a substantially disk-shaped first surface and a second surface not polished. And an oval-shaped through hole through which the oval-shaped portion of the output shaft is inserted is formed in the center, and is attached to the oval-shaped portion of the output shaft and inside the opening formed in the worm wheel. Is arranged and by the second surface of the output shaft It has a first disk plate supported by the column portion, a third surface that has been polished, and a fourth surface that is not polished, and is formed in substantially the same shape as the first disk plate. A second disc plate mounted in the oval-shaped portion, a third surface of which is ground and faces the first face of the first disc plate, and a second disc plate disposed in an opening formed in the worm wheel; and a worm wheel The non-circular opening is formed by pressing with a friction material into a shape that is similar to the shape of the non-circular opening, and a circular hole into which the oval-shaped portion of the output shaft is rotatably inserted is formed in the center, and the worm wheel is A first surface of the first disk plate and a second surface of the first disk plate that are fitted in the formed opening;
Friction plate disposed between the third surface of the disc plate of No. 4, the nut screwed to the male screw formed on the oval shaped portion of the output shaft, and the fourth surface of the nut and the second disc plate. And is attached to the oval-shaped portion of the output shaft,
It is characterized in that the disk plate and the friction plate are provided with an elastic member that presses against the cylindrical portion of the output shaft.

(Operation of the Invention) In the friction clutch holding structure of the small motor according to the present invention, the pressing force of the elastic member is applied to the second disk plate, the friction plate, the first disk plate and the cylindrical portion of the output shaft. Therefore, in the state where the pressing force of the elastic member is not applied to the worm wheel, the first
Disc plate and the second disc plate make pressure contact with the friction plate. Further, since the friction plate is integrally formed of a friction material, even if it is formed in a non-circular shape, no waste material is generated. And since the surface of the friction plate is the friction material itself,
There is no need to polish both surfaces.

Further, the friction plates are sandwiched by the first and second disc plates, and the friction plates are only three layers, so that the structure is simple.

Furthermore, the first and second disc plates need only be polished on one side facing the friction plate, and the number of manufacturing steps is small.

(Embodiment) FIGS. 1 to 3 show an embodiment of a friction clutch holding structure for a small motor according to the present invention.

That is, in the small motor 1 shown in FIG. 2, the worm 2 coupled to the armature shaft 9 of the armature (not shown) meshes with the worm wheel 3 inserted through the output shaft 10 in the motor casing 11, and the worm 2 And the worm wheel 3 constitute a gear reduction mechanism 4. An output gear 15 is attached to the output shaft 10 outside the motor casing 11, and the worm wheel 3 and the output shaft
A friction clutch mechanism 8 shown in FIG. 1 and FIG.

Rotational power from the armature shaft 9 is decelerated by the worm 2 and the worm wheel 3 and transmitted to the output shaft 10 via the friction clutch mechanism 8.

The worm wheel 3 is formed in a bottomed cylindrical shape and has an opening 3c formed in a non-circular shape that is slightly larger than a friction plate 5 included in a friction clutch mechanism 8 described later. Through hole in the center of 3c
With 3b. The through hole 3b is slightly larger than the outer diameter dimension of the columnar portion 10c provided on the output shaft 10 described later.

The output shaft 10 has a cylindrical portion 10c, and an oval-shaped portion 1 that is connected to the tip of the cylindrical portion 10c and that is smaller than the outer diameter dimension of the cylindrical portion 10c and has a male screw 10b formed on the outer peripheral portion.
0a is provided, and the cylindrical portion 10c is arranged in the through hole 3b of the worm wheel 3.

The friction clutch mechanism 8 is composed of the friction plate 5, the first disc plate 6, the second disc plate 7, and the elastic member 16.

As is clear from FIG. 3, the friction plate 5 has a non-circular opening 3c in which a friction material is formed on the worm wheel 3.
It is formed by press-molding into a disk shape that is substantially similar to the shape of the above, and at the center of the press contact portions 5a provided on both sides, a circular hole 5c is formed concentrically with the through hole 3b provided in the worm wheel 3. Are formed. In this circular hole 5c, the output shaft 10
The oval shaped part 10a is rotatably inserted. Further, on the outer peripheral portion of the pressure contact portion 5a of the friction plate 5, there are provided five locking protrusions 5b protruding outward at equal intervals. Second
The locking projection 5b is non-rotatably fitted into the opening 3c of the worm wheel 3 while being arranged between the disk plate 7 and the disk plate 7.

As is apparent from FIG. 3, the first disc plate 6 is formed in a substantially disc shape slightly smaller than the outer dimensions of the friction plate 5, and has an oval through hole provided at the center. The oval-shaped portion 10a of the output shaft 10 is non-rotatably inserted through 6b. This first disc plate 6 is
It is arranged in the opening 3c of the worm wheel 3 while being supported by the cylindrical portion 10c of the output shaft 10. Since the first surface of the first disc plate 7 on the friction plate 5 side is the abutting portion 6a that has been polished, the other second surface 6c is formed.
Is not polished. The second disc plate 7 is formed in substantially the same shape as the first disc plate 6, and has an oval through hole 7b provided in the central portion thereof and an output shaft.
The ten oval-shaped portions 10a are arranged in the opening 3c of the worm wheel 3 in a state of being inserted so as not to rotate. Since the third surface of the second disc plate 7 on the side of the friction plate 5 is the abutting portion 7a that has been polished, the third surface of the second disc plate 7
Surface 7c of is not polished.

The elastic member 16 is a disc spring and has a round hole provided in the center.
16a is inserted into the oval-shaped portion 10a of the output shaft 10.

Here, as is apparent from FIG. 3, the oval shaped portion 10a is inserted into the through hole 3b of the worm wheel 3 first, and then the output shaft 10
From the first disc plate 6 to the contact portion 6a
To the upper side of the figure, the through hole 6b is formed in the oval shaped portion 10 of the output shaft 10.
When the first disc plate 6 is inserted into the opening 3c of the worm wheel 3 while being inserted into the a, the through hole 6b of the first disc plate 6 is non-rotatably inserted into the oval-shaped portion 10a of the output shaft 10. The worm wheel 3 is arranged in the opening 3c while being supported by the columnar portion 10c of the output shaft 10.

Next, while inserting the circular hole 5c of the friction plate 5 into the oval-shaped portion 10a of the output shaft 10, the locking projection 5 of the friction plate 5 is inserted.
When b is fitted into the opening 3c of the worm wheel 3, the friction plate 5 has the pressure contact portion 5a on one side located on the contact portion 6a side of the first disc plate 6 and the opening of the worm wheel 3
It is non-rotatably arranged on 3c.

Then, with the abutting portion 7a of the second disc plate 7 on the lower side in the figure, the adult hole 7b is inserted into the oval-shaped portion 10a of the output shaft 10 and the second disc plate 7 is opened into the opening 3c of the worm wheel 3. When inserted into the second disc plate 7
The contact portion 7a is located on the other side of the friction plate 5 on the pressure contact portion 5a side, and the through hole 7b is non-rotatably inserted into the oval-shaped portion 10a of the output shaft 10.

Further, while inserting the round hole 16a of the elastic member 16 into the oval-shaped portion 10a of the output shaft 10, the elastic member 16 is brought into contact with the second disc plate 7, and then the felt washer 1
Insert the flat washer 18, collar 19, and lock washer 20 in this order into the oval-shaped portion 10a of the output shaft 10, and put the nut 21 on the output shaft 1
The male screw 10b formed on the oval-shaped portion 10a of 0 is screwed.

By screwing the nut 21 into the male screw 10b formed in the oval-shaped portion 10a of the output shaft 10, the elastic member 16 is in a state where elastic force is accumulated, and this elastic force causes the contact portion 7a of the second disc plate 7 to move. The pressure contact portion 5a on one side of the friction plate 5 is in pressure contact, and the pressure contact portion 5a on the other side of the friction plate 5 is in pressure contact with the contact portion 6a of the first disc plate 6.

Here, since the first disc plate 6 is supported by the cylindrical portion 10c of the output shaft 10 within the opening 3c of the worm wheel 3, the elastic force of the elastic member 16 causes the second disc plate 7 and the friction plate 5 to move. , The first disc plate 6 and the cylindrical portion 10c of the output shaft 10 and not the worm wheel 3, the first disc plate 6 and the second disc plate 7 are provided on only one side, respectively. The contact portions 6a and 7a, which are the polished surfaces, come into pressure contact with the friction plate 5.

[Advantages of the Invention] As described above, since the present invention has the above-described configuration, the friction plate is formed integrally from the friction material by compression molding or the like. No waste material will be produced. Further, since the surface of the friction plate is the friction material itself, there is no need to specifically polish both surfaces.

Further, the friction plates are sandwiched by the first and second disc plates, and the friction plates are only three layers, so that the structure is simple.

Furthermore, the first and second disc plates need only be polished on one side facing the friction plate, and the number of manufacturing steps is small.

Furthermore, the friction plate is fitted into the worm wheel to fix them, and the friction plate is
Since it is sandwiched by the first and second disc plates, the friction plate is not directly pressed against the output shaft, and the friction plate can be easily formed even though it is formed by the friction material. It won't break. Therefore, it is possible to reduce the number of man-hours required to manufacture the components of the disc plate and the friction plate as compared with the conventional one, so that the working efficiency can be improved and the waste material at the time of manufacturing can be reduced, so that the resource can be reduced. It has an excellent effect that the effective use of can be achieved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a small motor for explaining a friction clutch holding structure of a small motor according to an embodiment of the present invention, and FIG.
3 is a broken side view of the reduction mechanism portion of the small motor shown in FIG.
FIG. 4 is an exploded perspective view showing the external appearance of each part for explaining the friction clutch mechanism in the small motor shown in FIG. 1, FIG. 4 is a longitudinal sectional view of a conventional small motor, and FIG. 5 is the small motor shown in FIG. FIG. 3 is an exploded perspective view of the appearance of each part for explaining the friction clutch mechanism in FIG. 1 ... Small motor 2 ... Worm 3 ... Worm wheel 3b ... Through hole 3c ... Opening 5 ... Friction plate 5c ... Circular hole 6 ... First disc plate 6a ... First surface 6b ... Through hole 6c ... Second surface 7 ... 2nd disk plate 7a ... 3rd surface 7c ... 4th surface 9 ... Motor armature 10 ... Output shaft 10a ... Oval shape part 10b ... Male screw 10c ... Cylindrical part 16 ... Elastic member 21 ... Nut.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Sasaki 1760, Higashimatano-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Automotive Electronics Industry Co., Ltd. (56) References: 55-73617 (JP, U) -22929 (JP, U) Actually opened 60-59826 (JP, U) Actually opened 34-107 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A worm coupled to an armature of a motor, an opening formed in a non-circular shape on one surface, a through hole in a central portion, and a bottomed cylindrical shape. It consists of a worm wheel that is driven to rotate, a columnar part, and an oval-shaped part that is integrally coupled to the tip of this columnar part and has an external thread formed on the outer periphery, and the columnar part is inside the through hole of the worm wheel. The output shaft is arranged, and has a substantially disk-shaped first surface that has been polished and a second surface that has not been polished, and the oval-shaped portion of the output shaft is inserted through the central portion. An oval through hole is formed, is attached to the oval-shaped portion of the output shaft, is disposed in the opening formed in the worm wheel, and is supported by the second surface on the cylindrical portion of the output shaft. A first disc plate and a polished third surface And a non-polished fourth surface, which is formed in substantially the same shape as the first disk plate, is attached to the oval-shaped portion of the output shaft, and the ground third surface is the first surface. A second disc plate facing the first surface of the disc plate and disposed in the opening formed in the worm wheel, and having a shape substantially similar to the shape of the non-circular opening formed in the worm wheel. A circular hole through which the oval-shaped portion of the output shaft is rotatably inserted is formed in the center by press-molding with a friction material, and the circular hole is fitted into the opening formed in the worm wheel and the first hole is formed. First of the disc plate
Plate disposed between the surface of the second disc plate and the third surface of the second disc plate, a nut screwed to a male screw formed in the oval-shaped portion of the output shaft, the nut, and the second Is disposed between the disc plate and the fourth surface of the disc plate, and is attached to the oval-shaped portion of the output shaft,
A friction clutch holding structure for a small motor, comprising: an elastic member that presses the first and second disc plates and the friction plate against a cylindrical portion of the output shaft.