JPH0556095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a motor actuator.

"Prior Art" Conventional motor actuators use a switch that detects the stop position of the output shaft to drive a driven piece such as a mode door that adjusts the air blown from a vehicle air conditioner. The motor is stopped by attaching it to either a worm wheel fixed to the output shaft of the motor, or a connecting means such as a chain or wire that interlocks the output shaft and the driven piece. However, in these methods, in order to accurately match the closing position of the mode door on the driven side with the open/close position of the detection switch for detecting the stop position of the motor actuator, a play mechanism or the like is required in the connection means up to the mode door. It is necessary to provide
This has the disadvantage that the entire device becomes complicated. Furthermore, when the closed position of the mode door on the driven side is changed, the position of the stop position detection switch of the motor actuator must be adjusted accordingly, making it difficult to use.

In order to improve this, Fig. 6 shows the
No. 42216 is disclosed, but the load (reaction force) applied to the output arm 50 is constant on the intermediate gear 54 interposed between the output gear 51 having the output arm 50 and the output shaft 53 of the motor 52. When the intermediate gear 54 is moved in the axial direction, the electric switches 55 and 56 attached to both ends of the intermediate gear 54 are opened to stop the motor.

``Problems to be Solved by the Invention'' However, conventional motor actuators sense overload (reaction force) in parts other than the motor body, so failures in torque transmission parts such as intermediate gears of the motor actuator may occur. This has the disadvantage that the motor cannot be stopped even if an overload is applied to the motor.

"Means for Solving the Problems" The present invention has been made in view of such conventional drawbacks, and includes a motor body having an output shaft rotatably supported in a housing concentrically with the output shaft, A resilient means is installed between the motor body and the housing to generate a reaction force that returns the motor body rotatable in the direction to the neutral position. A circular arc-shaped common pattern, first and second patterns, and a connected pattern are provided, and a first brush that contacts the common pattern and a second brush that is branched into two tips are provided in the first and second patterns. First and second independent electric switches connected to each other are arranged so as to open when the motor main body rotates from the neutral position in the left-right direction by more than a certain angle, and the connection pattern and the first and second In order to solve the above problem, a configuration is provided in which diodes for regulating the current direction are connected between the two patterns in the forward direction and the reverse direction, respectively.

"Operation" The excessive load applied to the motor actuator is sensed in the motor body, and a common pattern, first and second patterns, and a connecting pattern are printed concentrically with the output shaft on a printed circuit board installed at the rear of the motor body. is provided with a brush with two branched tips, another brush, and first and second terminals, and has a diode connected pattern and the first
The pattern and the connected pattern are connected in the forward and reverse directions between the pattern and the second pattern.
Simply applying voltage to one of the terminals rotates the motor body in the left and right direction, and automatically stops the motor when the torque limit is exceeded.

"Example" The present invention will be explained based on the drawings of the example.
Both ends of the output shaft 2 existing in the motor body 1 are rotatably supported by the center portions of annular shaft bearings 3, 3 formed on both front and rear end surfaces of the motor body so as to protrude concentrically with the output shaft 2. be. A small diameter drive gear 4 is attached to the tip of the output shaft 2.
is engaged with a large-diameter gear 6, and a shaft rod 7 having an output arm (not shown) fixed to one end is pivotally attached to the center of the large-diameter gear 6, and the shaft rod 7 is rotatably attached to the housing 25a. It is pivoted.

Reference numeral 8 denotes a bearing for rotatably supporting the shaft bearing part 3, which is attached to both end surfaces of the housing 25a, and is further attached to both sides of the convex part 9 provided on the outer surface of the motor body 1 and the housing 25a with a coil spring or the like. The protrusion 9 is held in a neutral position by the resilient means 10, 10, which are equally tensioned or resiliently applied from both sides.

Incidentally, sponges 11, 11 are closely inserted into the coil spring, which is the springing means 10 in this embodiment, and serve as a damper against the rotation of the motor body 1.

A circular printed circuit board 14 is attached to a pair of motor terminals 13, 13 protruding from the rear side of the motor body 1 so as to form a plane perpendicular to the output shaft 2. The circuit pattern, that is, the arc-shaped common pattern 21 and the same arc-shaped first and second patterns 22 and 23 are provided concentrically with respect to the output shaft 2 with different diameters. A tip 30a and another end 30b, which are provided by branching the tip of the brush 30, are brought into contact with one end 22a and 23a on opposite sides of the first and second patterns 22 and 23, respectively.

Furthermore, the board 14 integrated with the motor body 1 is
When the brush is rotated by more than a certain angle in the direction of the arrow X in FIG. 2, the second electric switch B, which is composed of one end 23a of the second pattern and the other end 30b of the brush, is opened. Further, when the printed circuit board 14 is rotated in the direction opposite to the arrow in FIG.
Open electrical switch A.

A first diode 25 is connected between the first pattern 22 and the connection pattern 24 in the forward direction with respect to the connection pattern, and a first diode 25 is connected between the second pattern 23 and the connection pattern 24. Since the second diode 26 is connected in the opposite direction to the first pattern 22, the current flows from the first pattern 22 to the connected pattern 24.
In addition, from the connected pattern 24 to the second pattern 23
It flows only to

Note that between the common pattern 21 and the brush 31, there is a distal end 30a of the brush and one end 22 of the first pattern.
The angular position where a separates from the other end 30b of the brush
and the other end portion 23a of the second pattern are arranged and connected so that they do not separate even at an angle greater than the angular position where they separate. In the figure, 41 and 42 are first and second input terminals.

Next, to explain the operation of this embodiment, in the rotating direction of the output shaft 2 of the motor main body, the current flows through the first terminal 41, the brush 30, the brush tip 30a,
First pattern 22, first diode 25, connection pattern 24, motor body 1, common pattern 2
1, the brush 31 and the second terminal 42, the output shaft 2 in the motor body rotates in the direction of the arrow in FIG. 2, and the motor body 1 receives a load in the direction opposite to the arrow as a reaction force. There is.

When an overload is applied to the output shaft 2 from the output arm side via the shaft rod 7, the motor main body 1 rotates in the direction opposite to the arrow in FIG. 10, 10, when the motor main body 1 is rotated beyond a certain rotation angle, one end 22a of the first pattern 22 separates from the tip 30a of the brush, interrupting the electric switch A and stopping the motor. do.

Then, when a current is applied from the second terminal 42 side,
The first pattern 22 and the tip end 30a of the brush are separated, but the second pattern 23 and the other end 3 of the brush are separated.
Since 0b is connected, the current flows through the brush 31, common pattern 21, motor body 1, connection pattern 24, second diode 26, second pattern 23,
The flow flows into the brush 30 and the first terminal 41, and when the output shaft 2 of the motor is rotated in the opposite direction of the arrow in FIG.
The motor body 1 can rotate in the direction of the arrow in FIG. 2 and return to the neutral position, and if the rotation angle of the motor body 1 is within a certain range, the output shaft 2 continues to rotate. .

In this embodiment, a coil spring is used as the springing means 10 for returning the motor body 1 to the neutral position, but it is of course possible to use other torsion coil springs, leaf springs, etc. be.

"Effect of the invention" The present invention has the following effects.

Since the motor body detects overloads applied to the output shaft, the motor can be stopped immediately even if an overload is applied to the output shaft due to a failure in a torque transmission part such as a gear inside the motor actuator. So it's safe.

Since the circuit torque of the output shaft is reduced by the gear reduction ratio, the triggering means attached to the motor body for overload detection only needs to be of low load.
This explosive means can be made smaller and lighter.

[Brief explanation of drawings]

Figure 1 is a front view of the entire main part of this device with some parts omitted, Figure 2 is a front view of the motor body as seen from the rear.
FIG. 3 is a perspective view of the same, FIG. 4 is a front view of the motor body with a board attached as seen from the rear, FIG. 5 is an overall circuit diagram, and FIG. 6 is a plan view of a conventional actuator. A, B...Electric switch, 1...Motor body,
2... Output shaft, 10... Bombing means, 14... Printed circuit board, 21... Common pattern, 22... First
Pattern, 23... Second pattern, 24... Connected pattern, 25, 26... Diode, 25a...
…housing.

Claims (1)

[Claims] 1. A motor main body 1 having an output shaft 2 is rotatably supported in a housing 25a concentrically with the output shaft, so as to generate a reaction force that returns the motor main body 1, which is rotatable in the left-right direction, to a neutral position. Explosive means 10 and 10 are installed between the motor body 1 and the housing 25a, respectively, and an arc-shaped common pattern, first and second patterns, and a connecting pattern are formed on a printed circuit board attached to the rear of the motor body. and a first brush contacting the common pattern;
The two branched tips of the second brush are connected to the first and second patterns to form independent first and second electric switches, respectively, so that the motor body is oriented at a certain angle or more in the left and right direction from the neutral position. Diodes are arranged so as to open when rotated, and diodes for regulating the current direction are connected between the connection pattern and the first and second patterns in the forward direction and the reverse direction, respectively, and A motor actuator characterized in that when a load torque is applied, the electric switch is operated to cut off electricity to the motor.