JPH0134539Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to an electric actuator.
In particular, this invention relates to improvements in the mechanism that regulates the rotation of the motor rotor to a constant operating angle.

Conventionally, in an electric actuator, as a buffer stop means for stopping the rotor of the motor at a constant operating angle, there have been two methods: (1) means for colliding a protruding member provided on the rotor side with a metal spring plate provided on the motor body side; (2) Methods such as forming a rubber material on a protruding member on the rotor side and colliding it with each other, and (3) continuously rotating the rotor in the same direction and pressing it to a stopped position have been applied, but the method of (1) This method has the drawback that the protruding member collides directly with the metal spring plate, so the collision sound becomes noise, and with method (2), if the rubber elastic body is not thick enough, it cannot absorb the impact force. , there is a drawback that reversal force causes reversal and cracks are likely to occur, and method (3) has the disadvantage that it is impossible to provide a stop switch because force is applied continuously in the same direction. be.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and it is possible to reduce the collision noise between the buffer member on the motor body side and the protrusion member on the rotor side, and to prevent the occurrence of cracks in the buffer member. The main object of the present invention is to provide an electric actuator having a rotor operating angle regulating mechanism that allows easy assembly of a buffer member and that can be firmly held.

Hereinafter, this invention will be explained in detail based on drawings showing an example of its implementation.

In the drawing, 1 is a cylindrical casing constituting the motor body, 2 is a field pole, and 3 is a circular end plate. A bearing part 4 is provided at the center of the end plate 3, and a shaft 6 of a rotor 5 is attached to this. It is designed to be inserted and supported.

On the end surface of the rotor 5, a rod-shaped protrusion member 7 is protruded at an eccentric portion in a direction parallel to the axis.

The inner end plate 3 of the cylindrical casing 1 has dovetail receiving portions 8, 8 formed at both end portions separated by a predetermined center angle, and each dovetail receiving portion 8 is provided with a rubber-like material. A buffer member A made of an elastic material and having a substantially elliptical plate shape is fitted with a trapezoidal cross section having tapered side surfaces 9, 9.

A surface 10 of the buffer member A that projects toward the entrance of the receiving portion 8 is a receiving surface that collides with the protruding member 7, and this receiving surface 10 is formed into an arcuate surface and is chamfered from a midway portion thereof. This is a retraction surface 11. In addition, the buffer member A has
A hole 12 for a tool insertion hole is drilled in the required part, and by inserting a pin 13 (see Figure 4) into this hole 12 and operating it, it can be inserted into the dovetail receiving part 8. is made easy to do.

In the electric actuator configured as described above, the rotation of the rotor 5 is stopped at an angular position where the projection member 7 provided thereon collides with the buffer members A, A arranged on the motor body side. , the working angle is regulated.

When considering the situation in which the protruding member 7 on the rotor side collides with the receiving surface 10 of the buffer member A on the motor body side, suppose that the receiving surface 10 and the chamfered retracting surface 11 following it are on the same plane. , the receiving surface 10 receives a compressive load, and the retracting surface 11 receives a tensile load, and cracks are likely to occur due to concentrated stress.
As described above, if the receiving surface is an arcuate surface, and is chamfered from the middle part thereof, and is formed by the receiving surface 10 and the retracting surface 11, stress concentration on the receiving surface is prevented and cracks are prevented from occurring. Not only can it be suppressed, but also an excellent buffering effect can be obtained.

Furthermore, since the trapezoidal cross section of the buffer member A is fitted into the dovetail receiving portion, there is no risk of it slipping out in the event of a collision.

As described above, according to this invention, the rotor can be moved by the stopper bar-shaped protrusion member provided on the rotor side of the motor and the buffer member provided on the motor body side to receive this protrusion member. In an electric actuator in which the rotation of the motor is regulated to a certain operating angle, the buffer member is made of an elastic material such as rubber and has a substantially plate shape, and the plate-shaped buffer member is provided with a dovetail on the side of the motor body. It has a trapezoidal cross section that fits into the groove-shaped receiving part, and a part of the plate-shaped thick surface serves as a receiving surface for the protruding member, and the receiving surface is an arc-shaped surface, and a chamfer is drawn in from the middle part. Because it is made a face,
It is possible to reliably suppress the occurrence of cracks in the buffer member that receives the collision of the protruding member due to the collision action, and to improve the buffering effect.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of the motor of an electric actuator showing an embodiment of this invention, Fig. 2 is an enlarged side view of the attachment part of the buffer member, Fig. 3 is a plan view, and Fig. 4 is the buffer member. FIG. 5 is a front view of the buffer member, FIG. 6 is a side view, FIG. 7 is a rear view, FIG. 8 is a plan view, and FIG. 9 is a bottom view. DESCRIPTION OF SYMBOLS 1... Cylindrical casing of the motor body, 2... Field pole, 3... Circular end plate, 4... Bearing part, 5... Rotor, 6... Shaft, 7... Projection member, 8... Receiving part, A...Buffer member, 9...Tapered side surface, 10
...Receiving surface, 11... Chamfered retraction surface, 12
...Hole, 13...Pin tool.

Claims (1)

[Scope of utility model registration request] A stopper rod-shaped protrusion member provided on the rotor side of the motor and a buffer member provided on the motor body side to receive this protrusion member,
In an electric actuator in which the rotation of the rotor is regulated to a constant operating angle, the buffer member is made of an elastic material such as rubber and has a substantially plate shape, and the plate-shaped buffer member is provided on the motor body side. having a trapezoidal cross section that fits into the dovetail receiving portion;
An electric actuator characterized in that a part of the plate-shaped thick surface serves as a receiving surface for the protruding member, and the receiving surface is an arcuate surface and is chamfered from a midway portion thereof.