JPS6249496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake device, and particularly to a brake device suitable for hoisting machines such as hoists and electric chain blocks.

[Conventional technology]

A conventional brake device of this type will be explained based on FIGS.
is supported by Reference numeral 4 denotes another shaft or gear shaft, which is supported by the frame 1 by a bearing 5 in the same manner as the braked shaft 2. Reference numeral 6 designates a cylindrical brake case with a bottom, the opening of which is bent outward to form a flange 6a, and a hole 6b formed in the center of the bottom. 7 is an electromagnetic suction mechanism, and a screw 8 is installed on the outside of the bottom of the brake case so as to face the hole 6b and close it.
a to 8d, the attractor receiving surface of the stator 7a is exposed at the position of the hole 6b, and the attractor 7b
is installed inside the brake case. Reference numeral 9 denotes a brake disk, which is similar to the cylindrical portion of the brake case and has a slightly smaller external shape, and is housed in the cylindrical portion from the opening side so as to be non-rotatable but movable in the axial direction. Yotsute suction element 7
It is connected to b. The braked shaft 2, the suction element 7b, the connecting fitting 10, and the pin 11 are arranged on the same axial center line and move in the axial direction. At the bottom of the brake case 6, there are three guide pins 12a, 12b, 12c spaced inward at equal distances from the axis.
is erected, and these guide pins 12a, 12
Brake spring 1 with b and 12c as guides
3 is installed and stores the brake disc 9, the bottom of the brake case 6 and the brake disc 9 are
It is compressed and stored between. 14 and 15 are brake wheels, and 16 and 17 are friction receiving plates, which are sequentially and alternately stacked on the side surface of the brake disk 9, and are pressed from the outside by a brake case contact plate 18. As shown in FIG. 3, the brake wheels 14 and 15 each have a perfectly circular outer circumference and a boss 1 in the center.
A square hole 14a is formed to engage with the boss 19, and each brake wheel 14, 15 engages with the outer circumference of the boss 19 so as to be movable in the axial direction. A spline hole 19a is formed in the center of the boss 19, and this hole 1
The spline portion 2a of the braked shaft 2 is fitted into the spline portion 9a. The friction receiving plates 16 and 17 are provided with a relief hole 16a in the center, and the outer periphery is provided with a brake case 6.
It is similar to the cylindrical part of , but has a slightly smaller shape and is non-rotatable but movable in the axial direction. The brake case contact plate 18 has the same outer edge shape as the flange 6a of the brake case 6, and has the same outer edge shape as the flange 6a of the brake case 6.
Five cut-and-raised protrusions 18a, 18b, 18c, 18d, approximately equally spaced on the circumference separated by the same distance as
18e, and a friction receiving plate 17 is formed at the tips of these protrusions.
It is configured to accept movement in the axial direction of the brake case 6, and is temporarily fixed to the flange 6a of the brake case 6 with a set screw 19 to form an assembled structure. Furthermore, this brake case contact plate 18 is provided with escape holes (or positioning holes) 18f and 18g for receiving protrusions (bearings 3 and 5) of a mating machine. The brake device assembly structure constructed in this manner is attached to the frame 1 of a mating machine using the flange 6a using screws 20a, 20b, 20c, and 20d, and is in the state shown in FIG. 2.

[Problem that the invention seeks to solve]

In such a brake device, the brake wheels 14 and 15 are pressurized or released by the suction force acting on the attractor 7b of the electromagnetic suction mechanism 7 and the stretching force of the spring 13, but the suction surface of the stator 7a is attached to the brake case. 6 is not necessarily perpendicular to the axial direction (suction direction) due to the accuracy of the mounting surface, the attractor 7b is also restricted by the brake spring 13, and the brake disk 9 also rotates to some extent, so as a result, , the mutual adsorption surfaces of the stator 7a and the suction element 7b do not come into close contact with each other, and they adsorb each other in an unstable state. In such a state, if the power supply voltage is below the rated value, there is a drawback that the attractor 7b generates chattering or humming noise during suction.

[Means for solving problems]

The present invention was made in order to solve such problems, and the brake wheel 14 is attached to the braked shaft 2.
The stator 7a of the electromagnetic attraction mechanism 7 is attached to a part of the brake case 6 at multiple locations, and the stator 7a can be brought into close contact with the attractor receiving surface.
A brake disc 9 is mounted movably in the axial direction of the braked shaft 2, and a brake spring 13 for pressing the brake disc 9 against the brake wheel 14 is installed between the brake disc 9 and the brake case 6. In the provided brake device, the mounting hole 72a of the mounting leg 71a of the stator 7a of the electromagnetic suction mechanism 7 is larger than the outer diameter of the body 21a of the collar 21,
b and the outer diameter of the washer 22, and the plate thickness of this mounting leg 71a is made smaller than the length of the body portion 21a of the flanged collar 21, and the flanged collar 2
1 to the mounting hole 72 of the mounting leg 71a.
a, with the flange 21b in contact with the brake case 6 side and the washer 22 in contact with the tip of the body 21a of the flange collar 22, screws 8a to 8d are inserted into the brake case 6. The flange collar 21 and the washer 22 are penetrated through a part of the case 6, and the mounting leg 71a is loosely attached between the flange collar 21 and the washer 22 with gaps in the front, rear, right and left directions. It is a brake device.

[Effect]

In the present invention, when the electromagnetic attraction mechanism 7 stops biasing the stator 7a, the brake disc 9
Since the suction force of the suction element 7b is lost, the brake wheel 14 is moved by the spring force of the brake spring 13.
The shaft to be braked 2 is braked by pressing against it.

Next, when the stator 7a of the electromagnetic attraction mechanism 7 is energized, the attractor 7b is attracted to the attractor receiving surface of the stator 7a, overcomes the spring force of the brake spring 13, and moves the brake disk 9 away from the brake wheel 14. Pull apart. In this case, even if the mutual attraction surfaces of the stator 7a and the attractor 7b do not match, the stator 7a easily moves within the gap according to the mismatch, and the stator 7a and the attractor 7b The adsorption surfaces of the two match. For example, a case will be explained in which the stator 7a is attached to the stator attachment surface of the brake case 6 that is not perpendicular to the axial direction, and the attractor 7b is attracted with the attraction surface of the stator 7a tilted in the axial direction. Then, the suction element 7b is suctioned toward the stator while resisting the spring force of the brake spring 13 between the brake case 6 and the brake disc 9, so that the suction surface is suctioned in a state perpendicular to the axial direction. , the stator 7a first comes into contact with the inclined protruding side of the suction surface of the stator 7a, and since the mounting leg 71a of the stator 7a is loosely attached between the flange collar 21 and the washer 22, the stator 7a The stator 7a easily moves within the gap due to the suction force with the suction element 7b, and the suction surface of the stator 7a and the suction surface of the suction element 7b match. Furthermore, when the suction surface of the suction element 7b is inclined in the axial direction and is attracted by the suction element 7b, the stator 7a similarly moves easily and the suction surface of the stator 7a and the suction surface of the suction element 7b are connected. matches.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 5 and 6. The brake device of the present invention includes:
Stator 7a of electromagnetic attraction mechanism 7 and brake case 6
It is the same as the conventional one except for the mounting part.
The mounting hole 72a of the mounting leg 71a of the stator 7a of the electromagnetic attraction mechanism 7 is larger than the outer diameter of the body 21a of the collar 21 and smaller than the outer diameters of the flange 21b and the washer 22. The thickness of the mounting leg 71a is smaller than the length of the body portion 21a of the collar 21. Therefore, the body 21a of the collar 21 is inserted into the mounting hole 72a of the mounting leg 71a.
With the flange 21b in contact with the brake case 6 side and the washer 22 in contact with the tip of the body 21a of the flange collar 22, screws 8a to
8d (8b and 8c are not shown in FIG. 5) is attached to a part of the brake case 6 with a collar 21.
and the washer 22 is installed. Therefore, the mounting leg 71a has a gap between the collar 21 and the washer 22 on the left and right sides. In other words, the stator 7a is connected to the brake case 6 by the attractor 7b.
It is installed with a gap in both the suction direction and the rotation direction.

When the electromagnetic attraction mechanism 7 stops applying force to the stator 7a, the attraction force of the attraction element 7b disappears, so the brake disk 9 is pressed against the brake wheel 14 by the spring force of the brake spring 13, and the brake disc 9 moves the braked shaft 2. Brake. Next, the stator 7a of the electromagnetic attraction mechanism 7
When energized, the attractor 7b is attracted to the attractor receiving surface of the stator 7a, overcomes the spring force of the brake spring 13, and separates the brake disk 9 from the brake wheel 14. In this case, even if the mutual attraction surfaces of the stator 7a and the attractor 7b do not match, the stator 7a easily moves within the gap according to the mismatch, and the stator 7a and the attractor 7b The adsorption surfaces match.

For example, a case will be explained in which the stator 7a is attached to the stator attachment surface of the brake case 6 that is not perpendicular to the axial direction, and the attractor 7b is attracted with the attraction surface of the stator 7a tilted in the axial direction. Then, the suction element 7b is suctioned toward the stator while resisting the spring force of the brake spring 13 between the brake case 6 and the brake disc 9, so that the suction surface is suctioned in a state perpendicular to the axial direction. , stator 7a
The stator 7a first comes into contact with the inclined and protruding side of the suction surface of the stator 7a, and since the mounting leg 71a of the stator 7a is loosely attached between the flange collar 21 and the washer 22, the stator 7a and the suction element 7b are The stator 7a easily moves within the gap due to the suction force of the stator 7a.
The suction surface of the suction element 7b matches the suction surface of the suction element 7b.
Similarly, when the suction surface of the suction element 7b is inclined in the axial direction and is attracted by the suction element 7b, the stator 7
a moves easily so that the suction surface of the stator 7a and the suction surface of the suction element 7b match.

Therefore, the adhesion surfaces of the stator 7a and the attractor 7b are in stable contact with each other, and no chattering or humming noise occurs even if the power supply voltage decreases.

〔Effect of the invention〕

According to the present invention, the stator 7a of the electromagnetic attraction mechanism 7
When the suction element 7b is attracted to the suction element receiving surface of the stator 7a by energizing, if the suction surfaces of both 7a and 7b do not match, the stator 7a is moved within the gap according to the discrepancy. Easy to move with both 7
Since the suction surfaces of a and 7b coincide, the suction surfaces of the stator 7a and the attractor 7b are in stable contact, providing a brake device that does not generate chattering or humming noise even when the power supply voltage decreases. can do.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional brake device, Fig. 2 is a sectional view thereof, Fig. 3 is a partially exploded perspective view thereof, Fig. 4 is a side view of its electromagnetic suction mechanism, and Fig. 5 is a view of the present invention. FIG. 6 is an exploded perspective view of the stator attachment part of the brake device. 2... Braked shaft, 7... Electromagnetic attraction mechanism, 7a... Stator, 7b... Attractor, 9... Brake disc, 13...
Brake spring, 14, 15...brake wheel.

Claims (1)

[Scope of Claims] 1. A brake wheel 14 is attached to the braked shaft 2, a stator 7a of an electromagnetic attraction mechanism 7 is attached to a part of the brake case 6 at a plurality of locations, and the stator 7a is attached to a part of the brake case 6.
A brake disc 9 is attached movably in the axial direction of the braked shaft 2 to the suction element 7b that can be brought into close contact with the suction element receiving surface of the brake disc 9, and a brake spring 13 is provided to press the brake disc 9 against the brake wheel 14 side. Brake disc 9 and the brake case 6
In the brake device provided between the mounting leg 71 of the stator 7a of the electromagnetic attraction mechanism 7
The mounting hole 72a of a is connected to the body 21 of the collar 21
larger than the outer diameter of a and smaller than the outer diameter of the flange portion 21b of the flange collar 21 and the washer 22,
The plate thickness of this mounting leg 71a is determined by the flanged collar 21.
The body portion 21a of the flange collar 21 is positioned in the mounting hole 72a of the mounting leg 71a, the flange portion 21b is brought into contact with the brake case 6 side, and the washer 22 in contact with the tip of the body 21a of the collar 22, screw the screws 8a to 8d into the brake case 6.
The flange collar 21 and washer 22 are attached to a part of the flange.
A brake device characterized in that the mounting leg 71a is loosely attached between the collar 21 and the washer 22 with gaps in the front, rear, left and right directions.