JP3072125B2 - Electric actuator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric actuator which can be used, for example, for a vehicle door lock and whose output shaft can be freely moved manually or electrically.

[Conventional technology]

Conventionally, as a mechanism capable of manually operating this type of electric actuator, a neutral return type (refer to Japanese Patent Application Laid-Open No. 64-90376, a microfilm disclosed in Japanese Utility Model Application Laid-Open No. Sho 62-144370), and an idle type (Japanese Patent Publication No. 62-27226) And Japanese Patent Publication No. Sho 62-21110).

[Problems to be solved by the invention]

However, in the neutral return type, noise is generated because the spring is returned to a neutral location, and it is difficult to suppress the noise. Further, since the noise is generated after the operation of the actuator is completed, the noise is particularly annoying. Was. In addition, when returning to the neutral point, when friction occurs due to poor lubrication between the spring and the groove, the reliability of the actuator returning to the neutral point is low, and the operation requires a very large force. It has the disadvantage that it may become necessary or may become inoperable manually. Further, if the neutral return is performed by a spring or the like, the spring is involved in the operation of the actuator, resulting in a loss of operating force, which requires a large motor or a multi-stage speed reducer, resulting in a large structure. There was a disadvantage.

Also, in the swing type, the riding force is large due to factors such as voltage, load, friction, etc.
Further, there is a problem that a large impact is applied to the vehicle to return swiftly after riding, and a loud noise is generated. Also, considering the presence or absence of the electric brake circuit of the motor, the temperature, the variation of the motor idling torque, etc., the return angle is uncertain, so there is a disadvantage that manual operation is impossible or operation is required with extremely large force. Had.

Further, the electric contact control circuit type is provided with electrodes for detecting the positions of three points of the movement of the actuator in a locked state, an unlocked state, and a neutral state. It is very difficult in terms of manufacturing to accurately provide electrodes at individual locations, and the number of components, such as conductive wires, has increased as the number of electrodes has increased. Further, if the lock switch is not turned off after the lock switch of the door lock switch is turned on, it is necessary to return the lock switch to the off state in order to manually return the actuator to the neutral position and wait two times. Configuration.

Therefore, the present invention solves the above-mentioned problems, enables the use of a small motor, does not generate operation noise due to friction or the like at the time of operation, has a reliable operation, has a small number of parts, and has accurate position control. It is an object of the present invention to obtain an electric actuator which can be freely moved by manual operation and electric operation, which is capable of assembling in a manufacturing manner and waits for a manual state in one operation with good assembly.

[Means for solving the problem]

For this reason, the present invention is an electric actuator that can operate the door unlocked state manually and electrically by a door lock switch, and from the one end stop point through the center point to the other end stop point by forward and reverse rotation of the motor. The first moving member reciprocating in the range and the switching operation of the lock / unlock state are electrically operated by the movement of the first moving member to the one end and the other end stop point, at the center point of the first moving member. A second moving member that engages with the first moving member so as to be manually enabled by stopping, a supporting member that supports the first moving member and the second moving member, and a supporting member and the first moving member. An electrode contact fixed to each member and arranged to conduct electricity when the first moving member is located at a center point; and a current detection for detecting a reverse rotation current when the motor is forcibly stopped. An operation of rotating the motor forward when the lock state of the door lock switch is switched, reversely rotating the motor when the reverse current is detected by the current detecting means, and stopping the motor when the electrode contacts are energized; and a door lock switch. An electrical control unit that controls the motor to rotate the motor in reverse when the unlock state is switched and to rotate the motor forward when the reverse current is detected by the current detection unit and stop the motor when the electrode contacts are energized. , Is provided.

[Action]

By the forward rotation of the motor, the first moving member moves in a direction from the one end stop point to the other end stop point through the center point, and the reverse movement causes the first moving member to move from the other end stop point to the one end stop point through the center point. It moves in all directions and reciprocates freely within its range.
The first moving member normally stops at the position of the center point. At this time, the second moving member can be manually operated from the locked state to the unlocked state by engagement with the first moving member. Also,
When the door lock switch is switched to the locked state, the electric control unit obtains the signal of the door lock switch and rotates the motor forward. Then, the first moving member moves from the center point to the one stop point. Since the first moving member reciprocates in the range from the one stop point to the other stop point, when the first moving member reaches the one stop point, it cannot move any more and is forcibly stopped there. At this time, the motor linked to the first moving member is also forcibly stopped. At this time, since the motor is controlled by the electric control unit to rotate forward, a reverse rotation current is generated in the motor due to the forced stop. This reverse current is detected by the current detecting means, and the signal is sent to the electric control unit. The electric control unit obtains the signal and reverses the motor. Then, the first moving member moves from the one stop point to the center point. When the first moving member moves to the center point, the support member and the electrode contacts fixed to the first moving member conduct electricity, and send a signal to the electric control unit. The electric control unit obtains the signal and stops the motor. Since the above is performed by a series of operations, after the motor is stopped, the motor does not operate even if the door lock switch is connected to the unlocked state. The motor does not start to operate unless the door lock switch is switched. When the door lock switch is switched to the unlocked state, the electric control unit obtains the signal of the door lock switch and reverses the motor. Then, the first moving member moves from the center point to the other end stop point. The first moving member is forcibly stopped at the other end stop point as described above, and a reverse rotation current is generated in the motor due to the forcible stop. Then, as described above, the reverse current is detected by the current detecting means, and the electric control unit causes the motor to rotate forward. Then, the first moving member moves from the one stop point to the center point.
When the first moving member moves to the center point, the electrode contacts are energized in the same manner as described above, and the electric control unit stops the motor. Since the above is performed by a series of operations, after the motor is stopped, the motor does not operate even if the door lock switch is connected to the unlocked state. The motor will not start to operate unless the door lock switch is switched.

〔The invention's effect〕

Advantageous Effects of Invention According to the present invention, the door lock switch is small, has a low operating noise, has a single electrode contact, has a simple structure, and
An electric and manually switchable electric actuator that can be returned to a neutral position that can be operated electrically by actuation is provided.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS.

First, FIG. 1 shows an electric actuator used for a door lock actuator or the like according to an embodiment of the present invention, and is an exploded perspective view of the electric actuator.

Reference numeral 1 denotes a DC motor serving as a driving source. A worm 2 is attached to the output shaft of the DC motor 1. A worm wheel 3 meshes with the worm 2.
Reference numeral 4 denotes a housing lower part, and reference numeral 5 denotes a housing lid.

Reference numeral 6 denotes an electric control unit. The electric control unit 6 is fixed to the housing lower part 4 by screws 61. The substrate 62 supporting the electric control unit 6 has a hole 7, and the hole 7 has a column 8 existing at the bottom of the worm wheel 3.
The hole 7 supports the column 8. At the center of the pillar portion 8, there is a pillar portion through hole 9, and the shaft 10 passes through the pillar portion through hole 9. The shaft 10 is supported between a lower shaft support portion 11 of the housing lower portion 4 and an upper shaft support portion 12 of the housing lid 5. Reference numerals 13 and 14 denote motor support portions for supporting the DC motor 1, which are provided integrally with the lower housing portion 4. Reference numeral 15 denotes a contact portion, which is provided on the surface of the worm wheel 3 on the substrate 62 side, and comes into contact with the substrate contact 16 of the substrate 62.

Reference numeral 17 denotes a protrusion, which is provided on the outer periphery of the surface of the worm wheel 3 opposite to the side on which the substrate 62 exists. Then, as shown in FIGS. 2 (a), 2 (b) and 2 (c), the projection 17 passes through the center point 102 from the one end stop point 100 via the DC motor 1 and the worm wheel 3 and the other end stop point. The rotation range up to 101 is controlled by the electric control unit 6. Referring back to FIG. 1, reference numeral 18 denotes a slide plate, which is a portion serving as an output shaft of the electric actuator. The slide plate 18 is provided with a shaft engagement hole 19 that engages with the shaft 10 and an engagement hole 20 that engages with the protrusion 17 to move the slide plate 18 linearly. The engagement hole 20 has a rotation range from the center point 102 to one end stop point 100 and a center point 10 of the rotation range from the one end stop point 100 to the other end stop point 101 of the protrusion 17.
This hole has a size to accommodate the rotation range from 2 to the other end stop point 101.

The slide plate 18 is bent at an intermediate portion, and the bent portion 21 is provided with a rubber 22 for preventing impact. The impact preventing rubber 22 functions to absorb the impact of the slide plate 18 coming into contact with the inner side wall of the housing lower part 4 and to limit the linear movement of the slide plate 18. A shaft end of the slide plate 18 serving as an output shaft passes through an output shaft hole 23 provided in a side wall of the housing lower part 4 and is connected to an output unit (not shown). The shaft end of the slide plate 18 is covered with an elastic rubber 24, and the elastic rubber 24 is attached to an output section 25 provided around the output hole 23. The housing lower part 4 and the housing lid part 5 are attached by screws 26.

FIG. 3 shows the housing lower part 4 from the direction A1 in FIG.
4 is a partially transparent side view in which the housing lower part 4 is partially seen through the A2 direction in FIG. 1, and FIG. 5 is a partially transparent side view in which the housing lower part 4 is seen from the A3 direction in FIG. FIG. 6 is a partially transparent front view of the housing lower part 4 partially seen from the direction A4 in FIG.

Next, the operation of the electric actuator according to the embodiment will be described with reference to FIGS.

6 to 11 are partially transparent front views of the housing lid 5 of FIG. 1 viewed from the direction of arrow A4. Sixth
The figure shows a position where the projection 17 is located at the central portion 102 of the rotation range, in other words, a position where the projection 17 is substantially perpendicular to the direction of linear movement of the slide plate 18. In this state, when the worm wheel 3 serving as a rotating plate is rotated in the direction of arrow B by the DC motor 1 serving as a driving source, the projection 17 moves to a position as shown in FIGS. Accordingly, the slide plate 18 moves linearly in the direction of arrow C. Further, the rotation plate rotates, and the protrusion 17 and the slide plate 18 move from the state of FIG. 7 to the position shown in the state of FIG.
At this time, the impact preventing rubber 22 provided on the slide plate 18 abuts on the inner side wall of the housing lower part 4 to limit the range of linear movement of the slide plate 18. The projection 17 is always engaged with the engagement hole 20. From the above, the projection 17 is forcibly stopped, and the worm wheel 3
At the same time, the DC motor 1 is suddenly stopped, and a reverse rotation current is generated from the DC motor 1. This reverse current is transmitted to the electric control unit 6.
Then, the electric control unit 6 sends a reverse rotation current to the DC motor 1. Then, the wall wheel 3 slowly rotates in the direction of arrow D from the state in FIG. 8 to the state in FIG. Then, while the slide plate 18 maintains the fixed position, the protrusion 17 moves in the engagement hole 20, and the worm wheel 3 rotates to the center point 102. Then, the state shown in FIG. 10 is obtained. In this state, the substrate of the worm wheel 3
When the contact portion 15 provided on the 62 side comes into contact with the substrate contact 16 of the substrate 62, the DC motor 1 is stopped, and the worm wheel 3 is stopped at the center point 102. When the slide plate 18 is moved in the direction of arrow E in the state shown in FIG.
Since the engagement hole 17 exists within the range of the engagement hole 20, the engagement hole 20 can move the slide plate 18 without contacting the protrusion 17. Then, the state shown in FIG. 6 is obtained.

When the worm wheel 3 is rotated in the F direction in the state shown in FIG.
Moves in the direction of the arrow E to reach the state shown in FIG. After this state, the worm wheel 3 rotates in the direction of arrow G in FIG. 11, and returns to the state in FIG. In this state, the slide plate 18 can be manually moved in the direction of arrow C in FIG. 6, and when the manual operation is performed, the state shown in FIG. 10 is obtained.

Next, a block diagram of the electric control unit 6 is shown in FIG. 12, and the operation of the electric control unit 6 is shown in FIG. 13 which is a time chart.

First, when the door lock switch 30 is connected to the LOCK side, current flows through the timer 31, the timer 32, and the timer 35,
No current flows through the timers 33 and 34. At the same time, the current immediately flows out of the timers 31 and 35, and after a while, the current flows out of the timer 32. When a current flows from the timer 35, the main switch 36 is immediately turned on, and a current flows through the entire circuit. When current flows from the timer 31, the transistor 4
1. A current flows through the transistor 42, and a current flows through the DC motor 1 in the direction of arrow R. Then, the worm wheel 3 moves as shown in FIG. 6 to FIG.

As shown in the state of FIG. 8, the slide plate 18 comes into contact with the inner side wall of the housing lower part 4 and is stopped. At this time, since the projection 17 is in contact with the engagement hole 20, the worm wheel 3 is forcibly stopped and the DC motor 1 is stopped. At the same time, a reverse rotation current flows from the DC motor 1. The reverse current is received by the current detecting shunt resistor 50, and the current flows out of the comparator 51. This current instructs each timer to stop the current flowing from timer 31 and to cause the current to flow from timer 32. When the current of timer 31 is stopped,
The current of the transistors 41 and 42 stops. When a current flows from the timer 32, a current flows to the transistors 43 and 44, and a current flows to the DC motor 1 in the direction of arrow L. Then, the worm wheel 3 moves as shown in FIGS. At this time, since the current from the timer 32 passes through the current limiting resistor 52, the DC motor 1 reverses slowly. Then, when the worm wheel 3 comes to the center point 102 as shown in FIG. 10, the contact portion 15 provided on the worm wheel 3 and the substrate contact 16 of the substrate 62 come into contact. As a result, the neutral point switch 53 of the electric control unit 6 is turned on, and an instruction is issued to stop the current flowing from the timer 32. As a result, no current flows through the transistors 43 and 44, and the DC motor 1 stops.

Next, when the door lock switch 30 is connected to the UNLOCK side, current flows through the timers 33, 34, and 35, and no current flows through the timers 31 and 32.
At the same time, the current immediately flows out of the timers 33 and 35, and after a while, the current flows out of the timer 34. When a current flows from the timer 35, the main switch 36 is immediately turned on, and a current flows through the entire circuit. When the current flows from the timer 33, the current flows through the transistors 43 and 44, and the current flows in the DC motor 1 in the direction of the arrow L. Then, the worm wheel 3 moves as shown in FIGS.

As shown in the state of FIG. 11, the slide plate 18 comes into contact with the inner side wall of the housing lower part 4 and is stopped, and the projection 17 comes into contact with the engagement hole 20. Therefore, the DC motor 1 is stopped, and a reverse rotation current flows from the DC motor 1.
The reverse current is received by the current detecting shunt resistor 50, and the current flows out of the comparator 51. The current instructs each timer to stop the current flowing from the timer 33 and to output the current from the timer 34. When the current of the timer 33 is stopped, the currents of the transistors 43 and 44 are stopped, and when the current flows from the timer 34, the current flows to the transistors 41 and 42 and the DC motor 1 is moved in the direction of arrow R in FIG. Electric current flows. Then, the worm wheel 3 moves as shown in FIG. 11 to FIG. At this time, since the current from the timer 34 passes through the current limiting resistor 52, the DC motor 1 reverses slowly. Then, when the ohm wheel 3 reaches the center point 102 as shown in FIG.
The contact portion 15 provided on the worm wheel 3 and the substrate contact 16 of the substrate 62 come into contact with each other. As a result, the neutral point switch 53 of the electric control unit 6 is turned on, and an instruction is issued to stop the current flowing from the timer 34. As a result, no current flows through the transistors 41 and 42, and the DC motor 1 stops.

The present invention is OFF when the deadlock switch 54 is not operated.
The operation when the deadlock switch is turned ON will be described for reference.
When the deadlock switch 54 is turned on, and when the door lock switch 30 is set to the LOCK position, the timer 31 operates normally, passes through the transistors 41 and 42, and
Rotates, and the worm wheel 3 rotates in the R direction. Thereafter, when the comparator 51 receives the reverse rotation current from the DC motor 1, the current of the timer 31 is stopped, the current does not flow through the transistors 41 and 42, and the DC motor 1 stops rotating. At this time, since the timers 32 and 34 are reset because the deadlock switch 54 is ON, no current flows. Therefore, no current flows through the transistors 41, 42, 43, and 44. As a result, the worm wheel 3 does not return to the position shown in FIG. 6, but stops at the position shown in FIG. When the deadlock switch 54 is ON,
In this state, the timers 32 and 34 do not operate, and the worm wheel 3 stops at the position shown in FIG.

With the above operation, in the electric actuator according to the embodiment of the present invention, when the deadlock switch is set to OFF, the electric actuator automatically moves by switching the door lock switch to LOCK or UNLOCK, and then manually. You can move. Although not in the state of the present invention, when the deadlock switch is turned ON, the electric actuator automatically moves by switching the door lock switch between LOCK and UNLOCK, and thereafter cannot be moved manually.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an electric actuator according to an embodiment of the present invention, FIG. 2 is a top view illustrating a rotation range of a rotary plate used in the embodiment, and FIG. 3 is an arrow A1 in FIG. Partially transparent side view of the housing lid seen through from the direction, FIG.
The figure is a partially transparent side view of the housing lid seen through the direction of arrow A2 in FIG. 1, and FIG. 5 is a partially transparent side view of the housing lid seen through the direction of arrow A3 of FIG. FIG. 6 is a partially transparent side view of the housing lid as seen from the direction of arrow A4 in FIG. 1, FIGS. 7 to 11 are partially transparent front views showing changes in the operation of FIG. FIG. 12 is a block diagram of an electric control unit of the electric actuator of the present invention, and FIG. 13 is a time chart showing an operation of the electric control unit. 3 worm wheel (first moving member), 4 housing lower part (supporting member), 5 housing lid part (supporting member), 6 electric control part, 62 substrate (supporting member), 15 ......
Contact part (electrode contact), 16 ... Board contact (electrode contact), 18 ...
... Slide plate (second moving member), 30 ... Door lock switch, 50 ... Shunt resistance (current detecting means), 51 ... Comparator (current detecting means), 100 ... One stop point, 101 ...
Stop point at the other end, 102: Central point.

Claims (1)

(57) [Claims] An electric actuator capable of operating a door unlock state manually or electrically by a door lock switch, wherein a range from one stop point through a center point to another stop point by forward / reverse rotation of the motor is provided. The reciprocating first moving member and the switching operation of the lock / unlock state are electrically driven by the movement of the first moving member to the one end and the other end stop point, and stopped by the center point of the first moving member. A second moving member that engages with the first moving member so that it can be manually operated; a supporting member that supports the first moving member and the second moving member; and a supporting member and the first moving member. An electrode contact fixed to each other and arranged to be energized when the first moving member is located at a center point; and a current detecting means for detecting a reverse rotation current when the motor is forcibly stopped. An operation of rotating the motor forward when the lock state of the door lock switch is switched, reversely rotating the motor when the current detecting means detects a reverse rotation current, and stopping the motor when the electrode contacts are energized; An electrical control unit that controls the motor to rotate the motor in reverse when the lock state is switched and to rotate the motor forward when the reverse current is detected by the current detection unit and to stop the motor when the electrode contacts are energized. An electric actuator, comprising: