JPH0330673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a door lock actuator for locking the doors of automobiles or the like by remote control.

[Conventional technology]

As an actuator for locking and unlocking an automobile door by remote control from the driver's seat, there is a technique disclosed in Japanese Patent Application Laid-Open No. 181972/1983. The door lock actuator based on this technology is
As shown in the figure, a clutch plate C is fixed to a worm wheel B which meshes with a worm A and is driven in forward and reverse rotation, and a rotary plate E is attracted to the clutch plate C by an electromagnet D. The movement of the door is transmitted to the door lock mechanism by the rod F.

When this actuator operates the electromagnet D to attract the rotary plate E to the clutch plate C,
By driving the worm A with a motor G that can be rotated forward and backward, the door lock and its release can be performed only by operating a switch, and if the excitation of the electromagnet D is stopped, the door lock and its release can be performed manually. It can be canceled.

However, this technology requires assembling and constructing many parts, and there are limits to reducing the diameter and thickness of the worm wheel, making the entire actuator large. I had no choice but to. Furthermore, since the electromagnet used here is itself a moving part, there is also the problem that it is difficult to economically construct a stable power supply system with a long life.

[Problems to be solved]

In the current situation where automobile parts are desired to be further downsized, automobile doors are showing a tendency to be thinner, and door lock mechanisms are also desired to be thinner.

In response to such demands, the present invention is thin,
The object is to provide a door lock actuator that is simpler and has stable performance.

[Means to solve]

To achieve the above object, the present invention uses a combination of a fixed rack and a movable worm, and engages and releases the fixed rack with respect to the movable worm using a clutch mechanism, thereby driving the door lock mechanism or enabling manual operation. The present invention proposes a door lock actuator that can be used as a door lock actuator. a worm that is slidably mounted; a rack that can be engaged with or disengaged from the worm and fixed in the axial direction and provided parallel to the axial line; and movement of the worm in the axial direction. This is a thin door lock actuator for automobiles, which is equipped with an output device that outputs.

Hereinafter, the configuration of the present invention will be explained based on the drawings.

1 is a motor with an oval-shaped cross section and can be switched between forward and reverse directions; 2 is an output shaft of the motor 1 having a D-shaped cross section; 3 is a worm having a D-shaped hole that engages with the output shaft 2; 4 is a worm having a D-shaped hole that engages with the output shaft 2; This rack has teeth 4a that mesh with the worm 3, and a tapered surface 4c on the other end 4b. Reference numeral 5 denotes a rack guide, which has the function of restricting the rack 4 from moving in parallel to the output shaft 2, although it is free to move in a direction perpendicular to the output shaft 2. A guide member 6 is movable parallel to the output shaft 2 while contacting the tapered surface 4c of the rack, and is connected to a plunger 8 attracted by a solenoid 7 by a joint 9 and by a spring 10. It is biased in the opposite direction to the suction direction. Reference numeral 11 denotes a block-shaped output device that is loosely engaged with the worm 3 from the lateral direction so as to sandwich it from above and below, and is fixed to an intermediate position of the operating rod 12 by a fixing pin 13. 14 is a rod guide, 15 is a bearing that fixes the position of the tip of the output shaft 2, 16 is a housing for the entire actuator, and 17 is a lid.

[Effect]

The operation of the actuator of the present invention will be explained based on FIG.

In FIG. 1c, the solenoid 7 is not energized and the guide member 6 is in the position pushed up by the spring 10.
The worm 3 is movable up and down without engaging the rack 4, and there is no problem in manually operating the door lock.

When the solenoid 7 is energized in this state, the guide member 6 moves downward and the rack 4 is pushed rightward and engages with the worm 3 (FIG. 1b). At the same time, the worm 3 begins to rotate and move upward as the motor 1 is energized. As the worm 3 moves upward, the output device 11 also moves upward, and the operating rod 12 for driving the door lock mechanism is extended (FIG. 1a). The drive is stopped by cutting off the power when the movement of the worm 3 is completed, but the power may be cut off automatically by means such as a limit switch installed above or below the output device 11. This can be done either manually or manually.

Furthermore, since the motor 1 is reversed by changing the power supply polarity, for example, if a polarity change switch 18 or the like is provided in the middle of the power supply wiring as shown in FIG. Conversely, the operating rod 12 can be retracted. Furthermore, if the motor 1 is stopped while energizing the solenoid 7 is continued, the operating rod 12 will not move because the worm 3 will remain engaged with the rack 4 and will not be connected to the operating rod 12. The door lock mechanism will be fixed so that it cannot be operated manually.

In the present invention, if the tooth profiles of the worm 3 and the rack 4 are formed so that they are in contact with each other through sloped surfaces, the rack 4 is pressed against the worm 3 when the solenoid 7 is de-energized. Since the force is removed and the engagement between the rack 4 and the worm 3 is released by simply moving the worm 3 up and down, it becomes possible to manually operate the door lock mechanism. On the other hand, when the teeth of the worm 3 and the rack 4 are formed into a rectangular shape, the rack 4 is urged to the left so that the rack 4 is released from the mesh with the worm 3 at the same time that the solenoid 7 is de-energized. It is desirable to provide a spring or to move the rack 4 to the left in conjunction with the upward return of the guide member 6 to release the mesh.
Such a guide member 6 suitable for interlocking with the rack 4 may have a link mechanism in addition to having a cam mechanism.

[Effects of the Invention] The door lock actuator of the present invention as described above uses a flat motor and can be configured to be thin so as not to exceed the thickness of the motor. Since it is part of a movable output means, thrust bearings and the like are not required, the number of parts is small, the structure is simple, and assembly is easy. Further, since the motor and the solenoid can be provided in parallel and no special arrangement or shape of parts is required, the system is more compact and the cost of parts is reduced. Furthermore, there is an advantage that the clutch pressure for pressing the rack against the worm can be freely set by variously changing the structure and shape of the guide member.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the door lock actuator according to the present invention with the lid removed, in which a is a state in which the operating rod has been extended, b is a state in which the operating rod has been retracted, and c is a state in which the operating rod has been retracted. Indicates that it is removed. FIG. 2 is a sectional view of the actuator in a state corresponding to FIG. 1c, FIG. 3 is a perspective view showing the shapes of the motor and worm, and FIG. 4 is an example of a power supply circuit for the door lock actuator.
FIG. 5 is a front view showing the structure of a conventional door lock actuator. 1... Motor, 2... Output shaft, 3... Worm, 4... Rack, 6... Guide member, 7... Solenoid, 11... Output device, 12... Operation rod, A... Worm, B ...worm wheel,
C...Clutch plate, D...Electromagnet, E...Rotating plate, F...Rod, G...Motor.

Claims (1)

[Claims] 1. A flat motor with an output shaft provided at a fixed position, a worm fixed to the output shaft in the rotational direction and slidable in the axial direction,
A thin door lock for an automobile, comprising a rack that can engage and release the worm, is fixed in the axial direction, and is provided parallel to the axial line, and an output device that outputs movement of the worm in the axial direction. Actuator.