JP2549915Y2 - Small motor with friction clutch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor with a friction clutch used as a driving source for a sunroof, a power window or a power seat of an automobile, for example.

[0002]

2. Description of the Related Art FIG. 3 and FIG.
No. 11 exemplifies a small motor with a friction clutch disclosed in Japanese Patent Application Laid-Open No. 11-111, in which an illustrated small motor with a friction clutch 100 has an armature shaft 10 mounted on an armature 102 housed in a motor casing 101 of a motor section M.
2a, the armature shaft 102a
The worm 102b formed at the end of the gear casing 1
03 protrudes.

The gear casing 103 houses a worm wheel 104 having teeth 104a on its outer periphery which mesh with the worm 102b. The worm wheel 104 is connected to the output shaft 10 via a friction clutch 105.
6 is assembled.

[0004] The worm wheel 104 is provided with openings 104a and 104b having bottoms on the inner peripheral side of the tooth portion 104a, and a small-diameter cylindrical member is formed on an intermediate wall 104c provided substantially at the center of the openings 104a and 104b. A plurality of friction member holding holes 104d are provided.

An output shaft 106 supported by the gear casing 103 and having an engaging flat surface 106a is rotatably inserted into an output shaft insertion hole 104d provided at the center of the intermediate wall 104c. is there.

Here, the friction clutch 105 has a plurality of friction members 105a inserted into the friction member holding holes 104d of the worm wheel 104, the friction members 105a being formed of a friction material in a small diameter cylindrical shape, and a plate. Output shaft 1
06, the disk plates 105b, 1 rotating integrally with the output shaft 106 while being engaged with the flat surface 106a.
05c and a flat spring 105d having an elastic repulsive force for pressing the respective disk plates 105b and 105c against the friction member 105a. Each friction member 105a is provided with a friction member holding hole of the worm wheel 104. The disk plates 105b, 10 are attached to both end surfaces of the nuclear friction member 105a in a state of being inserted into the respective 104d.
5c is in contact.

In FIG. 3, the engagement flat surface 106a of the output shaft 106 is provided on the outer surface of the disk plate 105d on the left side of the friction member 105a.
The spring 109d is engaged with the spring 109d, and the nut 109 is output outside the gear casing 103 in a state where the felt washer 107 and the flat washer 108 inserted into the output shaft 106 are assembled to the spring 105d. It is screwed near the tip of the shaft 106.

In FIG. 3, the friction member 105a
An O-ring holding member 112 to which O-rings (O-rings) 110 and 111 are attached is provided on the outer surface of the disk plate 105c on the other side on the right side of the worm wheel 1.
04, and the gear casing 10 is located near the base end of the output shaft 106 inserted through the O-ring holding member 112.
The pinion 113 connected to the load is fixed outside the disk 3, and the disk plates 105b and 105c are pressed against the friction member 105a by the elastic repulsive force of the flat spring 105d.

In the small motor 100 with the friction clutch having such a structure, the armature 102 is rotated by the supply of power, so that the armature shaft 1 is rotated.
02a rotates, the tooth portion 1 of the worm wheel 104
04a and worm 10 of armature shaft 102a
The worm wheel 104 is rotated by meshing with 2b.

At this time, the friction member 105a held by the worm wheel 104 is moved to the disk plate 105b,
Since it is in non-movable pressure contact with the disk plate 105c, the disk plates 105b, 105c are generated by the frictional resistance between the friction member 105a and the disk plates 105b, 105c.
Are integrated with the friction member 105a and
Are in a power transmission state, and rotate the output shaft 106 integrally with the worm wheel 104.

Since the pinion 113 is rotated by the rotation of the output shaft 106, a sunroof drive unit such as a wire, which is a load connected to the pinion 113, is operated to move the sunroof lid to the open side or the closed side.

When the sunroof lid moves,
When the movement of the sunroof lid is restrained by an obstacle on the traveling side of the sunroof lid, when the output shaft 106 is locked, the friction member 105a held by the worm wheel 104 causes the disk plate 10 integrated with the output shaft 106 to be locked.
5b, 105c, the worm wheel 104 idles with respect to the output shaft 106 and the friction clutch 105 is in a power cutoff state. Therefore, the power of the armature shaft 102a is not transmitted to the output shaft 106. Then, the sunroof lid is avoided from the obstacle.

If power cannot be supplied due to a dead battery or the like while the sunroof is open, an on-board tool such as a driver is inserted into a manual tool insertion hole 106b provided at the end of the output shaft 106. By inserting and rotating, the output shaft 106 is manually rotated.

When the output shaft 106 is manually rotated through the manual tool insertion hole 106b, the disk plates 105b and 105c rotate integrally with the output shaft 106.

At this time, since the worm wheel 104 is engaged with the worm 102b of the armature shaft 102a, the worm wheel 104 does not rotate, and the disk plates 105b and 105c are moved against the frictional resistance of the flat spring 105d. Because it slides with respect to 105a,
The output shaft 106 rotates separately from the worm wheel 104, and operates the sunroof drive unit connected to the output shaft 106 to move the sunroof lid to the closing side.

However, in the above-mentioned conventional small motor 100 with a friction clutch, the friction member 105a has a small cylindrical shape and a plurality of friction members.
Each friction member 105a is inserted separately into a plurality of friction member holding holes 104d provided in the intermediate wall 104c of the worm wheel 104.
Since the disk plates 105b and 105c are pressed against the end surface of the worm wheel 105a, the friction members 105a are provided with the respective friction member holding holes 104d of the worm wheel 104d.
When the friction member 105a is displaced in the friction member holding hole 104d, rattling occurs during rotation of the worm wheel 104 and noise is generated, and the noise is annoying. There is a disadvantage that the quality is impaired.

[0017]

The problem to be solved is that it is difficult to assemble the friction member so that it does not shift with respect to the worm wheel.

[0018]

According to the present invention, in order to assemble the friction member so that the friction member does not shift with respect to the worm wheel, the worm wheel is substantially entirely formed by the friction member except for the friction surface of the friction member. The most main feature is that the friction member is formed integrally with the worm wheel, and the friction member and the worm wheel are displaced. The purpose of minimizing the operating noise by eliminating it was realized with a simple structure.

[0019]

The small motor with a friction clutch according to the present invention has a friction surface of a friction member formed integrally with the worm wheel in a state where the output shaft is not locked when the worm wheel is rotated by the power of the armature shaft. Is immovably pressed against the disk plate, so that the friction clutch is in a power transmission state and transmits the power of the worm wheel to the output shaft. On the other hand, when the output shaft is locked, the friction surface of the friction member formed integrally with the worm wheel is movably pressed against the disk plate and slides, so that the friction clutch is in a power cutoff state. Does not transmit the power of the worm wheel to the output shaft. Also, when the armature shaft side is not rotatable, the disc plate is movably pressed against the friction surface of the friction member formed integrally with the worm wheel and slides, so that the friction clutch is in a power cutoff state. To rotate the output shaft separately from the worm wheel. Therefore, as compared with the friction member having a small diameter cylindrical shape and a plurality of friction members and the friction member being inserted into the friction member holding hole provided in the worm wheel, the displacement of the friction member with respect to the worm wheel is smaller. It is unlikely to occur.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a small motor with a friction clutch according to the present invention will be described below with reference to FIGS.

Small motor 1 with friction clutch shown
The armature 3 accommodated in the motor casing 2 of the motor section M is provided with an armature shaft 3a, and a worm 3b formed at an end of the armature shaft 3a projects into the gear casing 4.

The gear casing 4 includes a worm 3
worm wheel 5 having tooth portions 5a on its outer periphery that mesh with b
The worm wheel 5 is housed in a state of being inserted through a pivot 6, and the worm wheel 5 is integrally provided with a friction member 8 which constitutes a part of a friction clutch 7. In FIG. 1, a first reduction gear 9 is fixed on the left side.

As apparent from FIG. 2, the friction member 8 is
A friction surface 8b is provided on the upper surface of a substantially disk-shaped main body 8a, and an output shaft insertion hole 8c which is a round hole is provided in the center. An outer peripheral edge 8d provided in the main body 8a and an outer peripheral edge 8d are provided.
An uneven portion 8f is formed by a fastening projection 8e projecting in a rectangular shape from a position opposing d in FIG.

As shown in FIG. 2, a concave hole 5 having an uneven groove 5b1 is formed on the side of the worm wheel 5.
b is formed at the center of the worm wheel 5
A friction member 8 is disposed in the concave / convex groove 5b1 of the concave hole 5b around the friction member 8 and the concave / convex portion 8f is disposed on the outer peripheral side, and the friction member 8 has a disk-like shape on the left side in FIG. The output shaft insertion hole 8c and the friction surface 8b are left in a state in which the stabilizing plate 10 is in close contact with the friction member 8 except that the friction member 8 is integrally formed. The surface 8b is exposed on the upper side in the figure, and the tooth portion 5a is formed on the outer periphery.

On the right side of the worm wheel 5 in FIG. 1, a disk plate 11 constituting another part of the friction clutch 7 is provided.

The disc plate 11 has a substantially disc shape, and has a small disc-shaped hole 11a at the center for engaging with an engaging flat surface 6a provided at the tip end of the pivot 6.
The left end face in FIG. 1 is a contact face 11 b for pressing against the friction face 8 b of the friction member 8.

Further, a spring body 12 constituting the remaining part of the friction clutch 7 is in contact with the right side of the disk plate 11 in FIG.

The spring body 12 is a flat spring having elasticity from the right side to the left side in FIG. 1, and has a hole 12a for inserting the pivot 6 in the center. The contact surface 11b is connected to the friction surface 8b of the friction member 8.
Pressure contact.

Here, as is clear from FIG. 2, a male screw 6b and a flat surface 6a formed flat with two opposing surfaces are provided on the distal end side near the upper end of the pivot 6. An emergency operation hole 6c for inserting a screwdriver or the like is provided near the lower end.
From the side, the first reduction gear 9, the worm wheel 5, the disc plate 11, the spring body 12, and the collar 13 are inserted, and then the flat washer 14 is inserted outside the gear casing 4.
Further, by screwing the nut 15 into the male screw 6b, the contact surface 11b of the disk plate 11 is pressed against the friction surface 8b of the friction member 8 with a predetermined pressing force.

The disc plate 11 is formed integrally with the pivot 6 because the small plate-shaped hole 11a is locked to the engaging flat surface 6a of the pivot 6.

The first reduction gear 9 has a second reduction gear 16 rotatably supported by the gear casing 4 and a third reduction gear 16.
The reduction gear 17 meshes with the third reduction gear 17, and an output shaft 18 protruding outside the gear casing 4 is fixed to the third reduction gear 17, and a sunroof drive unit such as a wire, which is a load, is connected to the output shaft 18. I do.

In the small motor with a friction clutch 1 having such a structure, as shown in FIG.
The armature 3 is rotated by supplying power to the armature 3 through the armature shaft 3.
When a is rotated, the power of the armature shaft 3a is transmitted to the worm wheel 5 by the engagement between the worm 3b of the armature shaft 3a and the teeth 5a of the worm wheel 5, so that the worm wheel 5 rotates.

At this time, the friction surface 8b of the friction member 8 formed integrally with the worm wheel 5 is brought into contact with the contact surface 11b of the disc plate 11 by the elastic repulsive force of the spring body 12.
, So that the friction clutch 7
Are in a power transmission state, and rotate the pivot 6 integrally with the worm wheel 5.

When the pivot 6 rotates, the first reduction gear 9, the second reduction gear 16, the third reduction gear 1
7. Activate a sunroof drive unit such as a wire connected via the output shaft 18 to move the sunroof lid to the open side or the close side depending on the rotation direction of the pivot 6.

When the sunroof lid moves and the movement of the sunroof lid is restrained by an obstacle on the traveling side of the sunroof lid, when the output shaft 18 is locked, the pivot 6
However, since the armature 3 continues to rotate, the contact surface 11b of the locked disk plate 11 cannot rotate with respect to the friction surface 8b of the friction member 8 integrally formed with the worm wheel 5. The state changes from the pressed state to the rotatably pressed state, and slides.

As a result, the worm wheel 5 is
And the friction clutch 7 is in a power cutoff state, so that the power of the armature shaft 3a is not transmitted to the pivot 6, thereby avoiding the sunroof lid from the above-mentioned obstacle.

Unlike the above, if power cannot be supplied to the armature 3 due to a dead battery or the like while the sunroof is open, a driver or the like is inserted into the emergency operation hole 6c provided on the pivot 6. The pivot 6 is manually rotated by inserting and rotating the vehicle-mounted tool.

When the pivot 6 is manually rotated through the emergency operation hole 6c, the disk plate 11
Also rotates integrally with the pivot 6.

At this time, since the worm wheel 5 is engaged with the worm 3b of the armature shaft 3a, the worm wheel 5 does not rotate, and the contact surface 11b of the disk plate 11 resists the frictional resistance of the spring body 12. As a result, the friction clutch 7 slides against the friction surface 8 b of the friction member 8, so that the friction clutch 7 is in a power cutoff state, and the pivot 6 is connected to the worm wheel 5.
And the sunroof drive unit connected to the pivot 6 is operated to move the sunroof lid to the closing side.

During this time, the friction surface 8b which is in non-rotatable pressure contact with the disk plate 11 and is in rotatable pressure contact
Is formed integrally with the worm wheel 5 receiving the power of the armature shaft 3a, so that the friction clutch 7 can be switched without separating from the worm wheel 5.

[0041]

As described above, since the small motor with a friction clutch according to the present invention has the above-described configuration, the worm wheel is almost completely removed from the friction member by the friction member except for the friction surface of the friction member. The friction member is formed in a shape that covers the whole and is integrally formed with the friction member, and the friction member is provided integrally with the worm wheel, thereby providing a small-diameter cylindrical shape and a plurality of friction members provided on the worm wheel. Compared with the one inserted in the member holding hole, the friction member does not shift in the switching operation of the friction clutch, and thereby, there is no backlash,
This is an excellent effect that an extremely quiet operation sound can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of a small motor with a friction clutch according to the present invention.

2 is an external perspective view of components around a friction clutch in the small motor with a friction clutch shown in FIG. 1;

FIG. 3 is a vertical sectional front view of a conventional small motor with a friction clutch.

FIG. 4 is an external perspective view of components around a friction clutch in a conventional small motor with a friction clutch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small motor with friction clutch 3a Armature shaft 5 Worm wheel 5a Tooth part 5b Concave hole 5b1 Concave groove part 6 Pivot shaft 7 Friction clutch 8 Friction member 8b Friction surface 8f Irregular part 11 Disk plate 11b Contact surface M Motor part

Claims (1)

(57) [Scope of request for utility model registration] 1. A with teeth for receiving the power of the armature shaft of the motor section is provided on the outer peripheral portion, the worm concave hole to have a convex-concave grooves on the side <br/> is formed wheel
And a concave and convex groove of a concave hole of the worm wheel
And a friction surface formed on a flat surface
A friction member formed and a disc play contacting a friction surface of the friction member.
And the disk plate with respect to the friction surface of the friction member.
A spring body to be pressed and connected to a load, and concentric with the disc plate.
A rotating shaft for rotating the disc plate against a friction surface of the friction member.
By pressing or sliding, the power on the pivot side is
Power transmission state or power to the worm wheel
A friction clutch that forms a friction clutch that switches to the
In the small motor with a wrench , the worm wheel is provided with the friction member by the friction member.
A shape that covers almost the entire friction member, excluding the friction surface of the friction member
And formed integrally with the friction member.
A small motor with a friction clutch.