JPH09209627A - Door lock actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit high-output torque to a control lever by forming a cam member to a body of revolution and fixing the control lever with a projecting section freely engaged with the cam member to an operating shaft at a place separated from a support shaft. SOLUTION: A worm 4 is bonded with an output shaft for an electric motor 3 housed in a case 2, and a worm wheel 5 is engaged with the worm 4. A body of revolution 6, to which a bird wing-shaped cam member 10 is formed, is supported to a support shaft 7, of which one end is borne by the case 2. A control lever 9 with a projecting section 11 freely engaged with the cam member 10 is fixed to an operating shaft 8 at a place separated from the support shaft 7. When the body of revolution 6 is turned by the electric motor 3, an abutting point between the cam member 10 and the projecting section 11 is brought near in the central direction of the support shaft 7 with the increase of rotation. Accordingly, torque transmission efficiency between the body of revolution 6 and the control lever 9 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock actuator for a door lock device mounted on a vehicle door.

[0002]

2. Description of the Related Art A door lock device is connected to an open lever and a locking button, which are connected to an open handle to engage and disengage a striker on a vehicle body side and a latch and a pole that can be engaged and disengaged by operating the handle. And a link mechanism having a locking lever for disabling or enabling the engagement / disengagement (locked state and unlocked state) by operating the button, and a locking arm connected to the locking lever of the link mechanism (interlocked with the movement of the button. ) Is operated electrically, and is composed of a door lock actuator that disables or enables the engagement and disengagement similarly to the button. Such a door lock device is disclosed, for example, in JP-A-63-272874 and JP-B-62-6078. As disclosed in the publication, a door lock actuator used in a door lock device is capable of following a worm coupled to an output shaft of an electric motor, a rotating body with a worm wheel that meshes with the worm, and a rotary motion of the rotating body. An actuating lever, and an actuating shaft that operates the rocking arm integrally with the actuating lever. The protrusion on the rotating body is brought into contact with the tip arm portion of the operating lever to transmit the movement of the rotating body to the operating lever. Is.

[0003]

Since the projection of the rotating body of the door lock actuator described above is located in the shape of an arc around the center of rotation of the rotating body, the center of the operating shaft of the operating lever and the arm portion of the operating lever tip are formed. Since the ratio of the dimension between the contact point with the protrusion and the dimension between the center of the rotating body and the contact point is small, it cannot be said that the rotational torque transmission efficiency of the electric motor is necessarily high. Therefore, an object of the present invention is to improve the efficiency of torque transmission from the rotating body to the actuating lever, and to enable high output and miniaturization of the actuator.

[0004]

In order to solve the above-mentioned problems, the present invention employs a technical means for providing a projection at the tip of the operating lever and a cam member on the upper surface of the rotating body.

More specifically, the present invention specifically supports an electric motor housed in a case, a worm coupled to the output shaft of the electric motor, and a support shaft that meshes with the worm and has at least one end supported by the case. Worm wheel,
Provided is a door lock actuator having a cam member formed on a worm wheel and an actuating lever having a protrusion engageable with the cam member and fixed to an actuating shaft at a position separated from a support shaft.

Preferably, the actuating lever has a cam hole,
At least one of the boss on the case side and the boss on the worm wheel side is inserted into the cam hole, and both ends of the support shaft are supported by the case.

According to the present invention, since the shape of the cam member can be arbitrarily selected, the dimensions of the contact point between the cam member and the projection portion of the operating lever and the center of the rotary member are reduced as the rotation angle of the rotary member increases. Since it is possible to increase the output, as shown in FIG. 6, the output torque can be made larger than in the conventional case in the rotation angle range of 15 to 24 degrees where torque transmission is achieved.

Since both ends of the support shaft of the rotating body are supported by the case and the boss of the rotating body is inserted through the cam hole of the operating shaft, there is no unnecessary vibration between the rotating body and the operating lever, and reliable operation is possible. It will be possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. The door lock actuator 1 includes an electric motor 3 housed in a case 2, a worm 4 fixed to an output shaft of the electric motor 3, and a rotator 6 having a worm wheel 5 meshing with the worm 4 on its outer peripheral surface. The body 6 is held in the case 2, and both ends of the support shaft 7 are supported by the case 2, an operating shaft 8 arranged at a position separated from the supporting shaft 7, and an operating shaft 8 integrated with the supporting shaft 7 And an actuating lever 9 extending in the direction. The rotating body 6 has a cam member 10, and the operating lever 9 has a downwardly projecting portion 11 at its tip.

The actuating lever 9 has a cam hole 12 along an arc centered on the center of the actuating shaft 8, and the boss portion 1 of the rotating body 6
4 and the boss portion 13 of the case 2 are inserted into the cam hole 12, and the cam hole 12 guides the rotation of the operation lever 9 about the operation shaft 8. Both ends of the support shaft 7 are case 2
Since there is no wobbling, the rotating body 6 is held along the entire length of the wobble-free supporting shaft 7.
Similarly, no shake occurs during its rotation. The cam member 10 provided on the rotating body 6 has a shape in which bird's blades passing through the center of the support shaft 7 are expanded, and both ends thereof are arcuate toward the tip side of the operating lever 9. The spring 15 shown in FIG. 2 has a function of returning the rotating body 6 to the neutral position, and in this example, the torsion angle between the worm 4 and the worm wheel 5 is changed when the rotational torque is transmitted from the worm wheel 5 to the worm 4. 4 is set to be rotated by the worm wheel 5.

When the electric motor 3 is turned on from the neutral position shown in FIG. 1 to rotate the rotating body 6 in one direction via the worm 4 and the worm wheel 5 (locking direction or unlocking direction), the rotating body 6 is rotated. The tip of the cam member 10 comes into contact with the projection 11 at the tip of the operating lever 9, and as shown in FIG. 3, the contact point is pulled toward the rotation center of the support shaft 7 so that the operating lever 9 moves. At the same time, in this example, it is rotated counterclockwise. The rotation of the actuating shaft 8 causes the locking arm 16 which is integrally connected to the locking lever of the link mechanism to rotate in the direction to obtain the door lock or the door unlock. 4 shows the operating lever 9
Shows the state of moving fully in one direction. In this state,
The rotating body 6 is prevented from rotating by a stopper (not shown),
Further, the power supply to the electric motor 3 is stopped.

When the power supply to the electric motor 3 is stopped, the urging force of the spring 15 causes the rotating body 6 to return to the neutral position shown in FIG. 1, that is, the position shown in FIG. In the state shown in FIG. 5 and the state shown in FIG. 1, the cam member 10 of the protrusion 11 is provided.
To different positions.

The reverse rotation of the electric motor 3 returns the operating lever 9 from the position shown in FIG. 5 to the position shown in FIG. 1 to obtain the door unlocked or door locked state. The movement of the locking arm 16 requires a large torque when the rotation angle is 15 to 24 degrees, but as shown in FIG. 6, since the rotating body 6 rotates so as to obtain a high output torque in this angle range, a highly efficient torque is obtained. Communication is possible. This is because the contact point between the cam member 10 and the protruding portion 11 shifts toward the center of the support shaft 7 as the rotation angle increases, and the dimension between the contact point and the center of the support shaft 7 and this contact point. This is because a large dimensional ratio between the center of the working shaft 8 and the center of the working shaft 8 can be obtained. In other words, this large ratio is obtained in the high output transmission rotation angle range.

The insertion of the boss portions 13 and 14 into the cam hole 12 makes the rotation and rotation loci of the rotating body 6 and the operating lever 9 constant.

[Brief description of drawings]

FIG. 1 is a plan view of a door lock actuator according to an example of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a plan view showing contact between a protrusion and a cam member.

FIG. 4 is a plan view showing a final rotation position of a rotating body.

5 is a plan view showing a state in which the rotary body is returned from the position of FIG. 4 to a neutral position.

FIG. 6 is a graph showing a relationship between output torque and rotation angle of a rotating body.

[Explanation of symbols]

 2 Case 3 Electric Motor 4 Worm 5 Worm Wheel 6 Rotating Body 7 Support Shaft 8 Operating Shaft 9 Operating Lever 10 Cam Member 11 Projection 12 Cam Holes 13, 14 Boss

Claims (3)

[Claims] 1. An electric motor housed in a case, a worm coupled to an output shaft of the electric motor, a worm wheel meshing with the worm, and at least one end of which is supported by a support shaft supported by the case. Lock actuator having a rotating body, a cam member formed on the rotating body, and an actuating lever fixed to the actuating shaft at a position separated from the support shaft and having a protrusion engageable with the cam member . 2. The door lock according to claim 1, wherein the actuating lever has a cam hole, and at least one of the case-side boss and the rotating body-side boss is inserted into the cam hole so that both ends of the support shaft are supported by the case. Actuator. 3. The door lock actuator according to claim 1, wherein an arm for connecting a locking lever of a door lock mechanism is fixed to the operating shaft.