JPS5836238Y2 - electric drive device - Google Patents

Description

[Detailed description of the invention] This invention can be used, for example, to drive poppet valves used in automobile exhaust gas control devices, or to accurately open and close heater and cooler doors (opening/closing air control panels). However, it generally relates to an electric drive device that causes an electric motor to perform reciprocating linear or reciprocating rotational motion.

The structure of the conventionally known one is, for example, disclosed in Utility Model Publication No. 46-3429.
As shown in Japanese Patent No. 4, there are many devices that obtain reciprocating motion by rotating an electric motor in forward and reverse directions.

However, using an electric motor with forward and reverse rotation is not only disadvantageous in terms of the life of brushes, wear of various bearings, etc., but also causes extreme response due to the inertia of the motor's armature when rapidly reversing the electric motor. It had some drawbacks, such as bad sex.

Further, although electric drive devices using one-way motors are known, there is no one that can accurately stop the output shaft suddenly at the maximum and minimum stroke positions.

This invention can use a rotary switch with a simple electrode shape, and is easy to manufacture and maintain.The circuit configuration is also simple, and the output shaft can be accurately adjusted to the maximum or minimum position by short circuiting the armature via the rotary switch. Sudden stop at 2 positions 2
The object of the present invention is to provide an inexpensive and highly reliable electric drive device that serves as an automatic position control actuator.

The present invention will be described below with reference to embodiments shown in the drawings.

In the drawing, 1 is an electric motor, 2 is a battery (power source),
Reference numeral 3 designates a particularly operational switch that serves as a single-pole double-throw switch means.

The armature 4, which is the main body of the electric motor, is connected to the output shaft 1a through a reducer (not shown), and an electric cam 5, which is the rotary switch.
It is equipped with

The electric cam 5 is constructed by arranging two metal first electrodes 5a and two metal second electrodes 5b in a pattern as particularly shown in the figure on a resin disc 5e.

Contactors 6a, 6N, 6N', and 6b fixed on a housing (not shown) slide on and contact the two electrodes 5a, 5b of the electric cam 5, respectively, as shown in the figure. A crank 7 of a slider crank mechanism is mounted on the output shaft 1a similar to the electric cam 5, and the rotational movement of the crank 7 is transmitted by a crank pin 8 to a reciprocating part, particularly a slider 10, through a connecting rod 9. transmitted,
The slider 10 is configured to perform linear reciprocating motion within the cylinder 11.

Further, the operation switch 3, which is an example of a single-pole double-throw switch means, is composed of a movable contact 3N, a maximum stroke side fixed contact 3a, and a minimum stroke side fixed contact 3b.

The linear reciprocating motion of the slider 10 is transmitted to a poppet valve of an automobile exhaust gas control device, a heater, or a door of a cooler.

N and S are permanent magnet fields of the motor.

The electric cam 5 has a fan-shaped member 5a and an annular member 5b.
4 contacts 6a, 6N,
6N' and 6b are placed at symmetrical locations a and l) on the circumference of the electric cam 5 at 180° phase.

Next, the operation will be explained.

When the movable contact piece 3N of the switch 3 is inserted into the contact point 3b from the illustrated state, battery -2 → armature 4 → movable contact piece 3N →
A closed circuit is formed in which the contact 3b → the contact 6b → the second electrode 5b of the electric cam 5 → the other pole of the terminal 2 is formed, the armature 4 rotates, and this rotation is transmitted to the output shaft 1 through a speed reducer (not shown).
The electric current is transmitted from a to the electric cam 5, and when the cam 5 rotates half a turn and the notch of the annular member 5b rotates to the part b, the electric path from the contact 6b to the other pole of the battery 2 is cut off, and the electric motor The armature 4 tries to continue rotating only by inertia, but since the adjacent contacts 6b and 6N' are short-circuited, especially by the fan-shaped member 5a, which serves as the first electrode of the electric cam 5, the armature 4→
Movable contact piece 3N→contact 3b→contact 6b→fan-shaped member 5a→
A short circuit from the contactor 6N' to the armature 4 is formed, the electrical energy generated in the armature 4 is consumed, and the armature 4 suddenly stops.

(Also, if the movable contact piece 3N is inserted again to the contact point 3a side, the output shaft 1a will rotate by half a rotation.

) At this time, since the slider 10 stops at the minimum stroke B position, accurate reciprocating motion between the maximum stroke AO and the minimum stroke B can be obtained.

Note that in the above embodiment, the first
The electrode 5a, the second electrode 5b, and the contacts 6a and 6N constitute a first automatic fixed position stopping mechanism, and the first electrode 5a,
The second electrode 5b and the contacts 6N', 6b constitute a second automatic fixed position stopping mechanism.

It goes without saying that various reciprocating mechanisms can be used, such as a Scotchok mechanism, a cam and cam follower mechanism, etc., in addition to the slider crank mechanism.

Further, the shape of the first electrode and the second electrode is not limited to the one embodiment described above, and various shapes can be adopted.

As mentioned above, in this invention, the rotary switch has two
It can be a simple device having various types of electrodes, so it is easy to manufacture and inexpensive, and since the circuit configuration is the simplest, it is convenient for maintenance and inspection.

Moreover, there is no need to reverse the electric motor 1, and the forced electric brake allows the output shaft to stop quickly and accurately at a fixed position. The fixed position stop mechanism provides excellent effects such as reciprocating motion with a large stroke, requiring high-speed response, and being extremely useful as a so-called terminal drive device that is electrically controlled.

Furthermore, since the pair of automatic fixed position stop mechanisms are provided on the output shaft 1a, even if the stroke of the reciprocating part of the reciprocating mechanism is changed, the reciprocating mechanism will operate reliably at the maximum and minimum strokes. However, the automatic fixed position stopping mechanism has the excellent effect of being highly versatile.

[Brief explanation of drawings]

The drawing is a configuration diagram showing an embodiment of an electric drive device according to the present invention. 1...Electric motor, 1a...Output shaft, 3.
...Single pole double throw switch means, 3a, 3b.
...Fixed contacts of different switch means, 4...
...Main body of the electric motor, 5...Rotation switch,
5a...First electrode, 5b...Second electrode, 7,8°9...Reciprocating mechanism, 10...
...Reciprocating part, A... Maximum stroke position,
B: Minimum stroke position.

Claims (1)

[Scope of utility model registration request] An output shaft 1a driven by an electric motor 1 rotating in one direction via a speed reducer, a reciprocating mechanism 7, 8.9 and a rotary switch 5 connected to the output shaft 1a, and the reciprocating mechanism 7, 8. single-pole double-throw switch means 3 connected to the rotary switch 5 for driving the reciprocating part 10 connected to the rotary switch 9 to the maximum stroke position A or the minimum stroke position B;
In the electric drive device, one pole of the main body 4 of the electric motor 1 is connected to one pole of the power source 2, and the main body 4 of the electric motor 1 is connected to one pole of the power source 2.
The other pole is connected to the movable contact 3N of the single-pole double-throw switch means 3, and the rotary switch 5 is connected to the - pole of the power source 2 at both the maximum stroke position A and the minimum stroke position B. and a first electrode 5a connected to different fixed contacts 3a, 3b of the single pole double throw switch means 3 at the maximum stroke position A and the minimum stroke position B to stop the electric motor 1; The second electrode 5b connects the other pole of the power source 2 and different fixed contacts 3a, 3b of the single-pole double-throw switch means 3 at a position other than the stroke position B to rotate the electric motor 1. Characteristic electric drive device.