JPH0514414Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a switch mechanism for an electric actuator, and more specifically, in an electric actuator used for an automobile door lock, etc., the output rod operated by a motor reaches a predetermined position. This relates to a limit switch or a position detection switch that is used to cut off the power to the motor when it detects that the output rod has stopped, and to automatically cut off the power when the actuated member connected to the output rod reaches the end of its operating stroke. .

BACKGROUND ART Conventionally, in this type of switch mechanism, the output rod of the electric actuator and the movable element of the switch are moved in conjunction with each other, and in most cases, the moving distance of the output rod and the movable element is the same. For example, as shown in FIG. 5, an output rod 2 operated by a motor 1 of an electric actuator has a pair of arms 3a and 3b.
The movable member 5 of the switch 4 is engaged between these arms 3a and 3b so that the output rod 2 and the movable member 5 move together. Therefore, in this mechanism, the stroke "SL" of the door lock member (not shown) interlocked with the output rod 2, the stroke "SA" of the output rod of the actuator, and the switch stroke, that is, the stroke "Ss" of the mover 5, are the same. Therefore, when the door lock stroke is particularly large, the switch stroke also becomes large, resulting in a large switch, which has the disadvantage that it takes up space and is difficult to downsize. Furthermore, the door lock member and the connecting rod that connects the door lock member and the output rod are susceptible to installation errors, such as when there is a positional error in the door lock member mounting hole provided in the door panel, or when there is an error in the length of the connecting rod. often occurs. In this case, as shown in the timing chart in Figure 6, due to the installation error The ending points will be different. Therefore, even if the door lock reaches its activation end point first, the movable element of the switch has not reached its energization end point, which often causes the switch to repeatedly open and close, causing so-called chattering. Also,
When operating in the opposite direction to the direction that causes the chattering, the switch reaches the energization end point before the door lock reaches the end point, resulting in an insufficient energization stroke Z, and the door lock cannot be fully stroked, resulting in malfunction. I had a problem.

Purpose of the invention The present invention solves the above-mentioned problems, does not cause chattering even if there is a considerable installation error, and allows the door lock to make a full stroke.Even when the door lock has a large stroke, the switch stroke can be reduced. This allows the device to be made smaller, thereby achieving miniaturization and space saving.

Structure of the invention In order to achieve the above object, the invention has the following features:
This is a switch that automatically cuts off electricity when the actuated member reaches the end of its operating stroke, and has a pair of arms protruding from an output rod that is moved by a motor that operates the actuated member. ,
The space between these arms is a recess for engaging the switch mover, and the width of the recess is set larger than the width of the mover, so that when the output rod is activated, only the output rod moves a predetermined distance, and then the mover is integrated. Move it to
When the movable element reaches a predetermined position, the power to the motor is cut off, while the stroke of the movable element of the switch is set smaller than the stroke of the actuated member that is linked and operated by the output rod, and the stroke of the actuated member is The present invention provides a switch mechanism for an electric actuator characterized in that the stroke of the output rod is set larger.

In this way, the stroke "SA" of the output rod of the electric actuator is set larger than the stroke "SL" of the door lock member, and the distance between the pair of arms for engaging the switch mover that protrudes from the output rod is adjusted to The width of the switch is set to be larger than the width of the arm to provide play a, and the mover is loosely fitted between these arms. During operation, only the output rod moves at first, and after moving by the distance of the play a, the switch mover is moved to the output rod. Therefore, the required stroke of the switch, that is, the travel stroke of the switch mover ``Ss, SsR'' is equal to the stroke ``SA'' of the output rod.
In addition, it is set to be much smaller than the stroke "SL" of the door lock member mentioned above (Ss,
SsR≪SL<SA), it is possible to make the switch more compact, and even if a mounting error occurs and the door lock side reaches the stroke end first, the output rod remains elastic due to the operating force of the electric actuator after the power is cut off. Although it will reverse due to the restoring force of the deformed connecting rod and mounting panel, the switch mover is left behind, preventing the occurrence of chattering.Moreover, by making the stroke SA of the actuator larger than the stroke SL of the door lock member, the switch To provide a switch mechanism for an electric actuator that can fully stroke a door lock member and reliably perform locking or unlocking operations without causing insufficient energization.

Embodiments Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In FIG. 1, 10 is an electric actuator installed inside the door, 11 is an output rod of the electric actuator 10, 12 is a connecting rod connected to one end of the output rod 11, and 13 is a cover connected to the other end of the connecting rod 12. The actuating member is a door lock member. When the door lock member 13 is automatically operated, when the motor 14 of the electric actuator 10 is energized by remote control from the driver's seat, as shown in FIG.
When the gear 15 rotates, the rack 11a formed at one end of the output rod 11 that meshes with the gear 15 moves linearly in the direction of the arrow, and as the output rod 11 moves, it locks the door lock member via the connecting rod 12. 13
is activated, and the locking or unlocking operation is automatically performed.

A pair of arms 11b and 11c for locking the switch mover are protruded from the middle part of the output rod 11, and a recess 11d for engaging the switch mover is formed between these arms 11b and 11c. , the movable element 1 of the limit switch 16 is inserted into the engagement recess 11d.
7 is loosely fitted. At this time, the width between the arms 11b and 11c is set to be larger than the width of the movable element 17 by a dimension a, so to speak, a play a is provided. By providing the play a in this way, the switch mover 1
7 is made smaller than the stroke of the output rod 11 by play a. In the limit switch 16, when the movable element 17 reaches positions P and P', which are slightly apart from the stroke ends at both ends of the guide portion 19 provided in the switch case 18, a detection position is reached in which the power supply to the motor 14 is cut off. It is said that The energizing strokes "Ss, SsR" of the limit switch 16 are set to be much smaller than the stroke "SL" of the door lock member 13. Therefore, the relationship between the door lock stroke "SL", the actuator (output rod) stroke "SA", and the switch energization stroke, that is, the movement stroke of the switch mover "Ss, SsR" is set as follows.

Ss, SsR<<SL<SA Next, the operation of the above switch will be explained. When the motor 14 is energized and the gear 15 is rotated in the direction of the arrow, the output rod 11 moves linearly in the direction of the arrow.
In this case, as shown in FIG. 3(), the mover 17 initially contacts the arm 11b and the arm 11c
Since there is a dimension a difference between the output rod 11 and the mover 17, only the output rod 11 moves with the mover 17 left behind, and after moving by the distance a, the arm 11c comes into contact with the mover 17, and the output rod and the mover 17 are integrated. Move along. When the movable element 17 moves a predetermined distance and reaches the detection position P, the power to the motor 14 is cut off. Similarly, the motor 14 rotates in the opposite direction, and the output rod 11 and mover 17
When the mover moves in the opposite direction, as shown in FIG. 3(), since the mover 17 is initially in contact with the arm 11c and is spaced from the arm 11b by a dimension a, only the output rod 11 moves and a Arm 11 after dimension movement
b comes into contact with the movable element 17, and the output rod 11 and the movable element 1
7 move in unison with each other, and when they reach the P' position, the energization is cut off. In this way, when the output rod 11 moves, only the output rod 11 moves first and the mover 17 moves.
is left behind, and the movable element 17 moves together with the output rod 11 after it has moved by a predetermined distance (dimension a), so that the stroke of the movable element 17 can be made small.

Also, if an error occurs in the mounting position of the door lock member 13 or the length of the connecting rod 12, the fourth
As shown in the timing chart in the figure, since the stroke "SA" of the output rod 11 is set larger than the stroke "SL" of the door lock member 13,
The output rod 11 and the movable element 17 reach the stroke end point before the door lock member 13, and the energization is cut off.
There will never be a situation where the door lock member 13 cannot make a full stroke. Conversely, even if the door lock member 13 reaches the stroke end first, after the power is cut off, the output rod is a connecting rod that is elastically deformed due to the operating force of the electric actuator.
Although it is reversed and moved in the opposite direction due to the restoring force of the mounting panel, etc., the movable element 17 is left behind at the start of movement, so no chattering occurs.

Effects of the invention As is clear from the above explanation, according to the invention, the energizing stroke of the switch of the electric actuator, that is, the movement stroke of the switch mover, is set to be extremely smaller than the door lock stroke. Even if the switch is large, the switch can be made smaller and does not take up space. In addition, compared to conventional structures, the structure is simple and requires only widening the distance between a pair of arms that protrude from the output rod in order to engage the movable element of the switch, so it can be provided at a low cost without any fluctuation in cost. I can do it. Furthermore, even if an installation error occurs, chattering can be prevented from occurring in the switch, and the door lock member will not be unable to make a full stroke due to insufficient power to the switch, and the door lock member can be automatically operated reliably. It has various advantages such as the ability to

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention;
Figure 2 is a perspective view of the actuator, Figure 3,
is a schematic diagram showing the operational relationship between the output rod and the switch mover, Fig. 4 is a timing chart in the case where an installation error occurs in the present invention, Fig. 5 is a perspective view showing a conventional example, and Fig. 6 is a conventional example. This is a timing chart when an installation error occurs. 10...Electric actuator, 11...Output rod, 11b, 11c...Arm, 11d...Movable engaging recess, 12...Connection rod, 13...Door lock member, 14...Motor, 16...Limit switch, 17... Movable element, a... Play dimension,
SL...door lock stroke, SA...actuator (output rod) stroke, Ss, SsR...switch energization stroke, P, P'...detection position.

Claims (1)

[Scope of Claim for Utility Model Registration] A switch that automatically cuts off electricity when an actuated member reaches the end point of its operating stroke, which comprises a pair of arms attached to an output rod that is moved by a motor that operates the actuated member. protruding from opposite to each other,
A recess is formed between these arms for engaging the switch mover, and the width of the recess is set larger than the width of the mover, so that when the output rod is activated, only the output rod moves a predetermined distance, and then the mover is integrated. Move it to
When the movable element reaches a predetermined position, the power to the motor is cut off, while the stroke of the movable element of the switch is set smaller than the stroke of the actuated member that is linked and operated by the output rod, and the stroke of the actuated member is An electric actuator switch mechanism characterized by a larger stroke of the output rod.