JPH066320Y2 - Actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an actuator for switching a rotatable rod into three rotation angles, and more particularly to a damping force switching device for an automobile suspension.

[Prior Art] FIGS. 12 to 16 show a conventional device of this type, in which 1 is a DC motor, 2 is a pinion press-fitted into the output shaft of the DC motor 1, and 3 is a pinion 2. The output gear meshes with each other, and an arcuate groove 4 is formed in the lower half portion thereof. Reference numeral 5 is an output shaft connected to the output gear 3 and is provided with a groove 6 to be fitted with the driven shaft 11. Reference numeral 7 is a solenoid that attracts the plunger 8 by energization, 9 is a spring that applies an urging force opposite to the attraction force of the solenoid 7, 10 is connected to the plunger 8 and is inserted into the groove 4 of the output gear 3 It is a stopper that limits the rotation of the output gear 3 and is rotatably supported.

The conventional actuator is configured as described above. When the DC motor 1 is rotated to the right while the solenoid 7 is not energized, the pinion 2 is also rotated to the right and the output gear 3 is rotated.
Rotates to the left. The stopper 10 is pushed to the center side of the groove 4 by the urging force of the spring 9 to rotate, and the left end portion of the groove 4 is rotated.
When the output gear 3 rotates to 4a, the rotation is stopped by the stopper 10 and stopped. After that, the power supply to the DC motor 1 is stopped to prevent the DC motor 1 from generating heat. The driven shaft 11 is held in the S position shown in FIG. 14 because of only frictional load. Next, when the DC motor 1 is rotated counterclockwise with the solenoid 7 de-energized, the pinion 2 also rotates counterclockwise.
The output gear 3 rotates to the right. When the output gear 3 rotates until the right end 4b of the groove 4 contacts the stopper 10, the rotation is stopped by the stopper 10 and stopped. After that, the power supply to the DC motor 1 is stopped.
At this time, the driven shaft 11 is held at the M position shown in FIG.

Next, when the solenoid 7 is energized at the S position to rotate the DC motor 1 to the left, the electromagnetic force of the solenoid 7 attracts the plunger 8 against the urging force of the spring 9, and the stopper 10 moves outside the groove 4. The pinion 2 is rotated to the left, and the output gear 3 is rotated to the right. When the output gear 3 rotates 60 ° and the recess 4c at the center of the groove 4 rotates to the position of the stopper 10, the stopper 10 moves to the recess 4c.
It goes in and the rotation of the output gear 3 is stopped here. After that, if the energization to the DC motor 1 is stopped and the energization to the solenoid 7 is stopped at the same time, the output shaft 5 and the driven shaft
11 is held in the H position. On the contrary, the solenoid 7 at the M position
When the DC motor 1 is rotated to the right, the stopper 10 is pressed against the outer diameter side of the groove 4, the pinion 2 rotates to the right, and the output gear 3 rotates to the left. When the output gear 3 rotates 60 ° and the recess 4c of the groove 4 rotates to the position of the stopper 10, the stopper 10 enters the recess 4c,
The rotation of the output gear 3 is stopped. Immediately thereafter, if the energization of the DC motor 1 is stopped and the energization of the solenoid 7 is also stopped, the output shaft 5 and the driven shaft 11 are held at the H position.

[Problems to be solved by the invention]

As described above, in the conventional actuator, when switching to the H position, the rotation direction of the DC motor 1 must be switched depending on the pre-switching position being the S position or the M position.
When it becomes necessary to change the position to the H position during switching, it is necessary to return to the S position and then to the H position, or to switch to the M position and then return to the H position, which results in a long switching time. was there.

The present invention has been made to solve the above problems, and an object thereof is to provide an actuator in which the rotation direction of a DC motor is determined only for the position after switching, regardless of the state before switching. And

[Means for solving problems]

The actuator according to the present invention comprises a sun gear, a planet, a planetary carrier, and a planetary gear mechanism composed of an output gear. The sun gear and the planetary carrier are each driven by a DC motor, and a stopper for limiting the rotation angle of each is attached. is there.

[Action]

In this invention, the sun gear and the planetary carrier are driven by the DC motor, but the rotation angle is limited by the stopper and the position of the output gear is determined with respect to the stop position of the sun gear and the planetary carrier. The position of the output shaft connected to the output gear can be controlled by selecting.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 101 is the first DC motor for driving the sun gear 103, 10
2 is a first pinion press-fitted into the output shaft of the first DC motor 101, 104 is a second DC motor driving the planetary carrier 106, and 105 is a first pinion press-fitted into the output shaft of the second DC motor 104. The second pinion 107 is a planet which rotates about a shaft 108 fixed on the planetary carrier 106, and its large gear 107a meshes with the sun gear 103, and the small gear 107b meshes with the output gear 108. An output shaft 109 is formed integrally with the output gear 108, and has a groove 6 which is fitted to the driven shaft 11. 110 is a first groove for limiting the rotation angle of the sun gear 103 to 120 ° by a stopper 111, and 112 is a planetary carrier 10 by a stopper 111.
The second groove limits the rotation angle of 6 to 120 °. The gear ratio from the sun gear 103 to the output gear 108 when the planetary carrier 106 is fixed is set to about 1/2. (For example, sun gear 103 ... 17 pieces, planet gear 1
If the gear ratio is 07a ... 24, planet small gear 107b ... 17, output gear 108 ... 24, the gear ratio is Further, FIGS. 1 to 5 show the S position, FIGS. 6 to 8 show the H position, and FIGS. 9 to 11 show the M position.

In the actuator configured as described above, the first DC motor 101 is moved to the left at the S position, and the second DC motor 1 is moved to the left.
When 04 is rotated leftward, the first pinion 102 and the second pinion 105 respectively rotate leftward, and the sun gear 103 and the planetary carrier 106 rotate rightward. When the sun gear 103 and the planetary carrier 106 rotate 120 °, the right end portions 110b and 112b of the first groove 110 and the second groove 112 come into contact with the stopper 111, and the rotation is stopped. At this time, the sun gear 103, the planet 107, and the planetary carrier 106 are in the same state as being glued and rotating, and the output gear 108 also rotates in the same manner, and rotates 120 ° to the M position. The switching from the M position to the S position is the reverse operation.

Next, when the first DC motor 101 is rotated to the right and the second DC motor 104 is rotated to the left at the S position, the first pinion 1
02 tries to rotate to the right and the sun gear tries to rotate to the left, but the stopper 111 is already in contact with the left end portion 110a of the first groove 110, and the first DC motor 101, the first pinion 102, and the sun gear 103 rotate. do not do. However, the second pinion 105 rotates to the left and the planetary carrier 106 rotates to the right, and at the position where the planetary carrier 106 has rotated 120 °, the stopper 111 and the right end 112b of the second groove 112 come into contact with each other to stop the rotation. . When the rotation angle of the output gear 108 is solved by the gluing method at this time, first, the sun gear 103, the planet 107, the planetary carrier 106, and the output gear 108 are glued to 120
Rotate to the right, then return the sun gear 103 by 120 ° with the planetary carrier 106 fixed. Since the gear ratio from the sun gear 103 to the output gear 108 is about 1/2, when the sun gear 103 is rotated 120 ° left, the output gear 108 rotates 60 ° left. Therefore, the output gear 108 rotates 60 ° clockwise, which is the difference between 120 ° clockwise and 60 ° counterclockwise, and the output shaft 109 and the driven shaft 11 rotate 60 ° clockwise from the S position, that is, the H position. Replace S from H position
When returning to the position, the first DC motor 101 may be rotated rightward as described above, and the second DC motor 104 may be rotated rightward opposite to the above.

When the first DC motor 101 is rotated to the right and the second DC motor 104 is rotated to the left at the M position, the second pinion 105 tries to rotate to the left and the planetary carrier 106 tries to rotate to the right. Is in contact with the right end portion 112b of the second groove 112, and the second DC motor 104 and the second pinion 10
5, the planetary carrier 106 does not rotate. However, the first pinion 102 rotates to the right and the sun gear 103 rotates to the left, and at the position where the sun gear 103 rotates 120 °, the stopper 111 and the left end 110a of the first groove 110 come into contact with each other to stop the rotation. At this time, since the planetary carrier 106 is stopped, it can be solved by a normal gear calculation. Since the gear ratio of the sun gear 103 to the output gear 108 is formed to be about 1/2, when the sun gear 103 is rotated left 120 °, the output gear 108 rotates 60 ° left. The output shaft 109 and the driven shaft 11 rotate 60 ° counterclockwise from the M position, that is, switch to the H position. The H position is the same as the gear position when the S position is switched to the H position. When returning from the H position to the M position, the first DC motor 101 may be rotated leftward in the opposite direction to the above, and the second DC motor 104 may be rotated leftward as in the above.

In the above embodiment, when switching to the H position, the first DC motor 101 is rotated right and the second DC motor 104 is rotated left. However, the first DC motor 101 is rotated left and the second DC motor 104 is rotated. The same operation can be expected by rotating 104 right.

Further, in the above embodiment, only the external gear is used, but the same operation can be expected with a planetary gear mechanism using an internal gear.

By the way, in the above embodiment, the gear ratio from the sun gear 103 to the output gear 108 is set to 1/2 to describe the three-position switching device, but the gear ratio may be changed to 1/3 and applied as a four-position switching device. Is.

[Effect of device]

As described above, this invention has a structure in which a sun gear, a planet gear, a planetary carrier, a planetary gear mechanism composed of an output gear and a planetary carrier are provided with a stopper for limiting a rotation angle and a DC motor for providing a driving force. The position of the output gear is determined with respect to the rotation direction of each DC motor, and the switching operation can be performed regardless of the position before switching.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a II-II sectional view of FIG. 1, FIG. 3 is a III-III sectional view of FIG. 1, and FIG. Figure IV-IV view, Figure 5 is the second
6 to 11 are explanatory views of the operation of the present invention, FIG. 12 is a schematic configuration diagram showing a conventional device, FIG. 13 is a longitudinal sectional view of the conventional device, and FIG. FIG. 16 is a diagram for explaining the operation of the conventional device. In the figure, 11 is a driven shaft, 101 is a first DC motor, 1
03 is a sun gear, 104 is a second DC motor, 106 is a planetary carrier, 107 is a planet, 108 is an output gear, 109 is an output shaft, 110 is a first groove, 111 is a stopper, 112
Is the second groove. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. An output gear for driving a driven shaft,
A planetary gear that meshes with the sun gear and the output gear, a planetary carrier that supports the planet gear, and two DC motors that respectively drive the sun gear and the planetary carrier are provided.
And a second groove of the planetary carrier, which is provided with a stopper for limiting each rotation angle.