JPH10121812A - Non-contact type electromagnetic clutch and door lock drive device which uses the non-contact type electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure of a non-contact type electromagnetic clutch, disconnect its power instantaneously, and make it possible to use it in a door lock drive device. SOLUTION: In an electromagnetic clutch 4 which is used in a door lock drive device 1, a rotator on output side 15 is arranged on outer periphery of a rotator on input side 8 in which rotation force of a drive motor 2 is transmitted for rotation, and a plurality of extreme teeth 8b provided on outer periphery of the rotator on input side 8 and a plurality of extreme teeth 15a provided on inner circumference of the rotor on output side 15 are arranged by opposing mutually through a minute gap G1. When electricity is conducted into a coil 10 held by a stator 11, a magnetic flux which passes the stator 11 which is a magnetic body, the rotator on output side 15, and the rotator on input side 8 is generated. Since the extreme teeth 8b of the rotator on input side 8 and the extreme teeth 15a of the rotator on output side 15 attract mutually through the minute gap G1, the rotator on input side 8 and an output shaft assembly 9 provided with the rotator on output side 15 operate integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type electromagnetic clutch and a door lock driving device using the electromagnetic clutch.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional door lock driving device for an automobile. The door lock drive device 100 includes a drive motor 110 that generates a rotational force, an electromagnetic clutch 120 that transmits the rotational force of the drive motor 110, a rack support member 130 that converts the rotational operation of the electromagnetic clutch 120 into a reciprocating operation, A lever shaft 140 and the like connected to the rack support member 130 are provided, and the locked state and the unlocked state can be switched by reciprocating the lever shaft 140 in the axial direction. As shown in FIG. 9, the electromagnetic clutch 120 used in the door lock driving device 100 includes a yoke 12 that rotates integrally with a shaft 140.
1 and an armature 122 slidably provided in the axial direction with respect to the shaft 140. The magnetic force of the coil 123 attracts the armature 122 to the yoke 121 to generate a frictional force between the two. Is transmitted.

However, in the electromagnetic clutch 120 utilizing this frictional force, the coating is performed between the worm gear 150 fixed to the output shaft 111 of the drive motor 110 and the gear 170 formed on the outer periphery of the housing 160 of the electromagnetic clutch 120. Since the lubricating oil such as grease enters the gap between the armature 122 and the yoke 121 and adheres to the friction surfaces of the two, there is a problem that the clutch force is reduced and a desired torque cannot be transmitted.

[0004] Therefore, there has been proposed a non-contact type electromagnetic clutch in which power is switched on and off by using electromagnetic force instead of frictional force. For example, Japanese Patent Application Laid-Open No. 53-99152 discloses a drive-side rotor to which rotation from a drive source is transmitted, a driven-side rotor opposed to the drive-side rotor, and a driven-side rotor. There is disclosed an electromagnetic clutch having a wound coil, and a driving rotor and a driven rotor are electromagnetically attracted by a magnetic force generated by the coil to transmit the rotation of the driving rotor to the driven rotor. Have been. Also, JP-A-6-20
Japanese Patent No. 5577 discloses a stator that holds a coil on the inner periphery, a cylindrical inductor rotatably disposed inside the stator, and a rotor rotatably provided inside the inductor. And an electromagnetic clutch in which the rotor rotates by electromagnetic induction generated as the inductor rotates.

[0005]

However, Japanese Patent Application Laid-Open No.
In the electromagnetic clutch disclosed in JP-A-99152, since the coil is wound around the driven rotor, a power supply slip ring for supplying power to the coil is required, and the structure is complicated. On the other hand, the electromagnetic clutch disclosed in JP-A-6-205577 has a structure in which the rotation of the inductor is transmitted to the rotor using electromagnetic induction generated by the rotation of the inductor. That is, unless the rotation of the input shaft becomes high to some extent, the electromotive force required to rotate the rotor cannot be generated. Therefore, it is not appropriate to use an electromagnetic clutch utilizing this electromagnetic induction in a door lock device that needs to be operated instantaneously.
The present invention has been made based on the above circumstances, and a first object of the present invention is to provide a non-contact type electromagnetic clutch having a simple structure and capable of instantaneously switching power.
A second object is to provide a door lock device using the non-contact type electromagnetic clutch.

[0006]

According to the first aspect of the present invention, the pole teeth of the input rotor and the pole teeth of the output rotor face each other via a minute gap and are held by the stator. The magnetic flux generated by the coil is configured to pass through the bipolar teeth via the gap. As a result, the pole teeth of the input rotor and the output rotor attract each other via a minute gap, so that when the input rotor rotates, the suction force acting between the pole teeth rotates the input rotor. Is transmitted to the output side rotor, and the output side rotor rotates. According to this non-contact type electromagnetic clutch, there is a problem of a conventional electromagnetic clutch utilizing frictional force (lubricating oil adheres to a friction surface and a desired torque cannot be transmitted).
Therefore, desired torque transmission can be performed reliably.

[0007] Further, even with the same non-contact type electromagnetic clutch, the electromagnetic clutch of the present invention has a structure in which the coil is held by the stator, as compared with a conventional product in which the coil is wound around the driven rotor. The need for a slip ring is eliminated, so that the structure is simple and the cost can be reduced. Furthermore, since the on / off state can be instantaneously switched by energizing and de-energizing the coil, it is suitable for applications requiring low-speed rotation and intermittent power.

According to the second aspect of the present invention, since the non-contact type electromagnetic clutch according to the first aspect is used for the door lock driving device, the conventional door lock driving system using the electromagnetic clutch utilizing frictional force. As compared with the device, the durability of the electromagnetic clutch is excellent, so that the reliability is improved. That is, in the electromagnetic clutch using the frictional force, slippage may occur on the frictional surface due to repeated use, and the torque transmitting force may be reduced. On the other hand, in the non-contact type electromagnetic clutch, the clutch force does not decrease even by repeated use, and is superior in durability as compared with the electromagnetic clutch using the friction force.

[0009]

Next, a non-contact type electromagnetic clutch according to the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is a sectional view of an electromagnetic clutch used in a door lock driving device. The door lock drive device 1 of the present embodiment includes a drive motor 2 for generating a rotational force, an output lever 3 connected to a door lock mechanism (not shown), and intermittent power between the drive motor 2 and the output lever 3. It is composed of an electromagnetic clutch 4 and the like. The energization of the drive motor 2 is controlled through a controller (not shown). The output lever 3 is operated by transmitting the rotational force of the drive motor 2 via the electromagnetic clutch 4 and switches between a locked state and an unlocked state of the door lock mechanism. Also, this output lever 3
As shown in FIG. 2 (A view in FIG. 1), the link rod 5
Is connected to a knob 6 which is manually operated by the occupant.
Therefore, when the output lever 3 operates, the operating force is transmitted to the knob 6 via the link rod 5, and the knob 6 moves between the lock position and the unlock position. Therefore, when the occupant manually operates the knob 6, the output lever 3 is operated via the link rod 5, and the door lock mechanism can be switched between the locked state and the unlocked state.

The electromagnetic clutch 4 has an input shaft 7 to which the rotational force of the drive motor 2 is transmitted, an input rotor 8 fixed to the input shaft 7, and a coaxial rotation with the input rotor 8. An output shaft assembly 9 that is freely supported, a coil 10 that generates a magnetic force when energized, a stator 11 that holds the coil 10, and a housing 12 that accommodates each component
And so on. The input shaft 7 is the mechanical coupling member 1
3 and is coupled to the output shaft 2a of the drive motor 2 to rotate integrally with the output shaft 2a. The input-side rotor 8 is made of a magnetic material, and is provided on a cylindrical body having a fitting hole 8a for fitting (press-fitting) to the input shaft 7 at the center as shown in FIG. A plurality of pole teeth 8b are provided on the outer circumference of both ends (upper and lower ends of FIG. 3) over the entire circumference.

The output shaft assembly 9 includes a pair of shaft end members 14 located at both ends in the axial direction and a pair of output rotors 15 (15A, 15A, 1
5B) and a spacer 16 interposed between the output rotors 15A and 15B. Shaft end member 14
Is made of a non-magnetic material such as SUS304, for example, and has a bearing portion 14a and a flange portion 14b. Bearing part 14
a is provided in a cylindrical shape, rotatably supports the input shaft 7 passing through the inner periphery thereof, and is rotatably supported by the housing 12 via a bearing 17 fitted on the outer peripheral surface. One of the shaft end members 14 (on the side of the anti-drive motor 2 in the axial direction) has a cylindrical portion 14 extending from the bearing portion 14a.
The end of the output lever 3 is fitted to the outer periphery of the cylindrical portion 14c, and is fixed by tightening the nut 18.

The output side rotor 15 is made of a magnetic material, and is provided on an annular body as shown in FIG. 4, and a plurality of pole teeth 15a are protruded from the inner circumference of the annular body over the entire circumference. ing. The output-side rotor 15 is arranged such that the pole teeth 15a protruding from the inner periphery face the radial outer periphery of the pole teeth 8b protruding from the input rotor 8 via a small gap G1. (See FIG. 1), the spacer 1 is provided on the flange portion 14b of each shaft end member 14.
6. The spacer 16 is made of the same non-magnetic material as the shaft end member 14 (for example, SUS304).
By being interposed between both output rotors 15A and 15B,
The magnetic flux between both output side rotors 15A and 15B is shut off.

The coil 10 is energized by a controller (not shown), and generates a magnetic flux when energized (see FIG. 5). The stator 11 is made of a magnetic material, is provided in an annular body having a U-shaped cross section, is fixed to the inner peripheral surface of the housing 12, and holds the coil 10 on the inner peripheral side. The inner peripheral surface of the stator 11 is opposed to the outer peripheral surface of the output side rotor 15 via a small gap G2. Housing 12
Supports the output shaft assembly 9 rotatably via a bearing 17 fitted on the outer periphery of the bearing portion 14a.
The housing 12 and the drive motor 2 are fixed via a predetermined mounting member (not shown).

Next, the operation of this embodiment will be described. The drive motor 2 and the electromagnetic clutch 4 are energized through a controller when an occupant turns on a manual switch (not shown). The manual switch is provided, for example, on a door trim beside a driver's seat. When the coil 10 of the electromagnetic clutch 4 is not energized, the input shaft 7 and the output shaft assembly 9 are free from each other, and the output lever 3 and the drive motor 2 are disconnected.
The operation force when manually operating is reduced.

When the coil 10 of the electromagnetic clutch 4 is energized together with the drive motor 2, the magnetic flux passing through the stator 11, the output rotor 15, and the input rotor 8, which are magnetic substances, as shown by the broken line in FIG. Occurs. Due to this magnetic flux, the pole teeth 8b of the input rotor 8 and the pole teeth 15a of the output rotor 15 attract each other via a small gap G1, so that the input rotor 8 and the output rotor 15 are connected. The output shaft assembly 9 provided integrally operates. As a result, when the input shaft 7 rotates in response to the rotation of the drive motor 2, the input rotor 8 fixed to the input shaft 7 rotates, and the rotation of the input rotor 8 is transmitted to the output shaft assembly 9. As a result, the output shaft assembly 9 rotates. As a result, the rotation of the output shaft assembly 9 is transmitted to the door lock mechanism through the output lever 3, and the door lock mechanism can be switched from the unlocked state to the locked state or from the locked state to the unlocked state.

(Effects of the present embodiment) According to the present embodiment, a magnetic flux is passed through the pole teeth 8b of the input rotor 8 and the pole teeth 15a of the output rotor 15 which are opposed to each other via the small gap G1. Thus, the input-side rotor 8 and the output-side rotor 15 can be electromagnetically (that is, contactlessly) coupled. Thus, the problem of the conventional electromagnetic clutch utilizing the frictional force (the desired torque cannot be transmitted due to the adhesion of the lubricating oil to the friction surface) can be avoided, so that the desired torque can be transmitted reliably. In the case of an electromagnetic clutch utilizing a frictional force, slippage may occur on the frictional surface due to repeated use and the torque transmitting force may be reduced.
Does not utilize the frictional force, so that the clutch force does not decrease by repeated use. This allows
Since the durability is superior to the electromagnetic clutch using the frictional force, the door lock drive device 1 with high reliability can be provided. Further, the same non-contact type electromagnetic clutch 4 can
The electromagnetic clutch 4 of the present invention has a structure in which the coil 10 is held by the stator 11, so that a slip ring for energizing the coil 10 is not required as compared with a conventional product in which the coil 0 is wound around the rotor. Accordingly, the structure is simple and the cost can be reduced.

(Second Embodiment) FIG. 6 is a sectional view of the electromagnetic clutch 4. This embodiment shows an example in which the stator 11 is arranged radially inside the input rotor 8 of the electromagnetic clutch 4. However, the input side rotor 8 has the pole teeth 8b.
And a non-magnetic spacer 1 between the ring bodies 8A and 8B.
9 is connected to the input shaft 7 through a shaft end member 20 also made of non-magnetic material. On the other hand, in the output shaft assembly 9, the output side rotor 15 having the pole teeth 15 a is supported by the non-magnetic shaft end member 14, and the cylindrical portion 14 d of the shaft end member 14 rotates around the outer periphery of the shaft end member 20. An output gear 21 is provided on the outer periphery of the cylindrical portion 14d so as to fit freely. Therefore, the output lever (not shown) is connected to the output gear 2.
It is provided so as to reciprocate through a rack (not shown) that meshes with 1. In this embodiment, as in the first embodiment, the magnetic flux (indicated by a broken line in FIG. 6) generated by the coil 10 is applied to the pole teeth 8b of the input rotor 8 and the output rotor 1.
5, the input rotor 8 and the output rotor 15 can be electromagnetically connected without contact. Thereby, the same effect as in the first embodiment can be obtained.

(Third Embodiment) FIG. 7 is a sectional view of the electromagnetic clutch 4. This embodiment shows an example in which the electromagnetic coupling force between the input rotor 8 and the output rotor 15 of the electromagnetic clutch 4 is increased. The structure of the electromagnetic clutch 4 is such that the stator 11 is disposed radially outward as in the first embodiment, but as shown in FIG. 7, the input rotor 8 and the output rotor 15 are Each is used more than once. The input side rotor 8 is arranged such that the input shaft 7 is
9, two are fixed in series. Output rotor 1
5 are three (15A, 15B, 15B) via both sides facing the stator 11 and a non-magnetic spacer 16 therebetween.
C) It is arranged. In this embodiment, the magnetic flux generated by the coil 10 has the pole teeth 8b of the two input rotors 8 and the pole teeth 15a of the three output rotors 15 as shown by the broken lines in FIG.
Through the small gap G1, the electromagnetic coupling force between the input-side rotor 8 and the output-side rotor 15 increases, and more reliable clutch operation can be performed.

(Modification) In each of the above embodiments, an example is shown in which the input rotor 8 and the output rotor 15 are arranged to face each other in the radial direction. May be adopted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electromagnetic clutch used for a door lock driving device.

FIG. 2 is a view as viewed from A in FIG. 1;

FIG. 3 is a perspective view of an input-side rotor.

FIG. 4 is a perspective view of an output-side rotor.

FIG. 5 is a sectional view of an electromagnetic clutch showing a magnetic circuit.

FIG. 6 is a sectional view of an electromagnetic clutch (second embodiment).

FIG. 7 is a sectional view of an electromagnetic clutch (third embodiment).

FIG. 8 is a plan view showing the internal structure of the door lock driving device (prior art).

FIG. 9 is a sectional view of an electromagnetic clutch (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door lock drive device 2 Drive motor (drive source) 3 Output lever 4 Electromagnetic clutch 8 Input side rotor 8b Input side rotor pole teeth 10 Coil 11 Stator 15 Output side rotor 15a Output side rotor pole teeth G1 gap

Claims (2)

[Claims] An input rotor having a plurality of pole teeth protruding along the direction of rotation, the input rotor being rotatably transmitted coaxially with the input rotor. An output-side rotator provided with a plurality of pole teeth protruding along the direction of rotation of the input-side rotor via a minute gap with the input-side rotor; and the input-side rotation via the gap. Non-contact type electromagnetic comprising: a coil for generating a magnetic flux passing through the pole teeth of the rotor and the output rotor; and a stator holding the coil and forming a part of a magnetic path through which the magnetic flux passes. clutch. 2. A drive motor for generating a rotational force, an output lever connected to a door lock mechanism, and an electromagnetic clutch for connecting and disconnecting power between the drive motor and the output lever. A non-contact type electromagnetic clutch according to claim 1, wherein: