JPS58201556A - Motor with attraction and release type brake - Google Patents

Abstract

PURPOSE:To prevent the slack of a mount of each part in the end of a rotor shaft of the side provided with a brake disc by interposing an elastic member between the shaft and a bearing, thereby absorbing and alleviating large impact force which is produced when the brake disc is attracted. CONSTITUTION:An attracting unit 1a which is buried with a rod 3 made of many magnetic materials radially at the outer periphery of a disc 2 made of nonmagnetic material is mounted together with a rotor 5a on a rotor shaft 6, and disposed in the space formed between the inner surface of a stator 4 and the rear surface of the rotor 5a. A brake disc 12a which has a magnetic material on the opposed surface to the unit 1 and is formed with a brake retainer 18a on the rear surface is slidably mounted on the shaft 6, and a brake spring 24 is arranged between the unit 1 and the disc 12a. An elastic member 18 made of a leaf spring is interposed, for example, between the engaging ring 17 of a rear bearing 17 and a washer 19a of an engaging member 19 of the bearing, and an impact force which is produced when the disc 12a is attracted is absorbed to an elastic member 28 through the engaging part 19 of the shaft 6 to the bearing 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric brake system, an electric traveling device, or other mechanical equipment equipped with a suction release type brake device configured to be automatically released by magnetic attraction force during operation of an electric motor. The invention relates to electric motors.

In such electric motors, each time the motor is started, the brake disc is suddenly attracted and collides with the suction body, resulting in a large impact force acting on the suction body, which can damage the components of the motor over long periods of use. Otherwise, the mounting parts of each part may become loose.

In order to alleviate the impact force generated by such suction of the brake disc, various efforts have been made in the past.

An example of a conventional electric motor of this type is shown in FIG. 1 is an attracting body, and as shown in FIG. 2, a large number of rods 6 made of magnetic material are arranged radially in the axial direction of the outer circumference of a disc 2 made of non-magnetic material.
is buried in the rotor shaft 6, and the stator 4
The rotor 5 is located in a space formed by the inner surface of the rotor 5 and the rear surface of the rotor 5 (on the right side of the figure). 7 is a flange provided on the rotor shaft 6;
Reference numeral 9 denotes an elastic member, such as a disc spring, interposed between the suction body 1 and the flange 7. 10 is an annular groove 8 of the rotor shaft 6
This is a locking member for the suction body 1 attached to the body, and is made of, for example, a two-part ring as shown in FIG. ing.

Reference numeral 12 denotes a cone-shaped brake disc, which includes an attracted body 13 having a magnetic material on at least the surface facing the attracting body 1, a truncated conical disc 14 fixed to the attracted body 13, and a truncated conical disc 14 fixed thereto. Friction plate 15 made of a material with a large friction coefficient attached to the outer peripheral surface
It consists of a spline.

It is attached to the rotor shaft 6 by a key and a keyway so that it does not rotate but is slidable in the axial direction.

Reference numeral 16 denotes a rear frame, which supports the rear end of the rotor shaft 6 by a bearing 17 provided at its center, and a brake receiver 18 is provided on the inner surface of the conical portion. 19 is a locking member for the bearing 17 screwed onto the rear end of the rotor shaft 6;
The protruding piece 22 of the detent fitting 21 is bent and engaged with a groove 20 provided on the outer periphery of the locking member 19.

A brake spring 25 is disposed in an annular space 24 formed by the suction body 1 and the suction target 16 of the brake disc 12, and constantly presses the brake disc 12 rearward (to the right in the figure). When press-fitting the brake holder IEl of the frame 16,
, the gap between the suction body 1 and the suction target 13 is maintained at a predetermined dimension.

The front end (left side in the figure) of the rotor shaft 6 is connected to an input shaft 26KII of a reduction mechanism of an electric chain hoist, an electric traveling device, or other mechanical equipment via a connecting member 25, and is connected to a front frame 27 via a bearing. is supported by

In the electric motor configured as described above, when the electric motor is energized, the member 3 made of a magnetic material provided on the attraction body 1 is magnetized and attracts the attraction object 13 of the brake disc 12. As a result, the attracted object 13 slides in the axial direction (to the left in the figure) against the spring 26, and the frictional engagement between the friction plate 15 and the brake receiver 18 is released, allowing the rotor shaft 6 to rotate. do.

At this time, the object 13 to be attracted is suddenly attracted and the object IC
Even if a large impact force is applied to the suction body 1 due to a collision, this impact force is absorbed and alleviated by the elastic member 9, so that the frame body 6 of the suction body 1 may shift outward and come into contact with the stator 4.
There is no risk that the mounting parts of each part will loosen.

By the way, recently, an electric motor in which a rotor and a suction body are integrally combined has been proposed, but in such an electric motor,
Unlike the conventional electric motor shown in FIG. 1, it is not possible to insert an elastic member between the seven lunges of the rotor shaft and the suction body to absorb and alleviate the large impact force generated by the suction of the brake disc. Problems such as those mentioned above have occurred, and an early solution is desired.

The present invention aims to solve the above problems by interposing an elastic member between the bearing and the rotor shaft at the end of the rotor shaft. The present invention will be explained below using the drawings.

FIG. 4 is a longitudinal sectional view of an embodiment of the present invention. In addition.

Components having the same or similar functions as those in FIGS. 1 to 6 are denoted by the same reference numerals, and explanations thereof will be omitted. 1@ is a suction body, and 58 is a rotor, both of which are attached to the rotor shaft 6 and integrally connected. Reference numeral 126 denotes a brake disc, which is provided with a magnetic material at least on the surface facing the attracting body 1, and a brake receiver 186 is formed on the rear surface (right side in the figure) &C. 16 is the rear frame, and a 15° friction plate is attached to the surface facing the brake receiver 1860. The present invention includes a locking ring 176 of the rear bearing 17, a locking member 190 of the bearing, a washer 19,
The device is characterized in that an elastic member 28, such as a disc spring, is interposed between the two.

Since the present invention is configured as described above, the brake disc 12.
The large impact force generated when the rotor shaft 6
．． The impact force is applied to the elastic member 28 via the locking member 19 of the bearing 17 and is absorbed and relaxed thereby, so that the impact force propagating to each component is significantly attenuated. Therefore, there is no risk that the frame 3 of the suction body 1 will shift outward and come into contact with the stator 4, or that the attachment portions of each component will loosen.

In the above embodiment, a case is shown in which the rotor and the suction body are integrally connected to an electric motor, but the present invention can also be implemented in a motor in which the rotor and the suction body are separated. That is, jlE
As shown in another embodiment in Figure s, the rotor 5 and the suction body 1 are separated as in the conventional example in Figure 1, but the front side of the suction body 1 (left side in the figure) is connected to the The bearing 17 and the locking member 1 are attached to the rotor shaft 6 in contact with each other as in the embodiment shown in FIG.
An elastic member 28 is interposed between the elastic member 9 and the elastic member 9. With this configuration, the brake disc 12. It can absorb and alleviate the impact force that occurs when suctioning.

In the above embodiment, a flat plate-shaped friction brake is used, but a cone-shaped friction brake or a laminated plate-shaped friction brake as shown in FIG. The plate may be attached to either the brake disc side or the 7V-arm side.Moreover, although a disc spring is used as the elastic member 28 according to the present invention, it is also possible to use a coil spring or other elastic member. and the configuration of each other parts.

It goes without saying that the mechanism is not limited to this embodiment, and may be modified as appropriate without departing from the gist of the present invention.

As is clear from the above description, in the present invention, an elastic member is interposed between the rotor shaft and the rear bearing to absorb and alleviate the large impact force generated when the brake disc is sucked.
There is no risk that the rod of the suction body will collapse outward or that the mounting parts of various parts will become loose, and the life of the electric motor can be greatly extended.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an example of an electric motor equipped with a conventional suction release type brake device, Fig. 2 is a plan view of the suction body, Fig. 3 is a plan view of the locking member of the suction body, and Figs. FIG. 5 is a longitudinal sectional view of each embodiment of the present invention. 1.1. : Suction body, 3: Rod body, 4: Stator, 5°5a
: rotor, 6: rotor shaft, 7: flank, 12.12.
Nibrake board, 15.15. :Friction plate, 16.16p:
Frame, 17: Bearing, 18° 18, Nibrake bearing, 1
9: locking member, 26: spring, 28 two elastic members. Agent Patent Attorney San Kimura Memej Leap Dream 2 Figure 321 Figure 4

Claims (1)

[Scope of Claims] A suction body attached to a rotor shaft, a brake disc slidably mounted on the rotor shaft, a frame having a bearing supporting an end of the rotor shaft in the center; In an electric motor equipped with a brake device interposed between a suction body and a brake disc, and comprising a spring or the like that presses a brake holder or friction plate provided on the brake disc to a friction plate or brake holder provided on the frame, An electric motor equipped with a suction release type brake device, characterized in that an elastic member is interposed between the bearing and the rotor shaft.