CN109477531B

CN109477531B - Electromagnetic brake device

Info

Publication number: CN109477531B
Application number: CN201780041895.5A
Authority: CN
Inventors: 松本达也; 尾方尚文
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2016-07-07
Filing date: 2017-06-01
Publication date: 2020-03-03
Anticipated expiration: 2037-06-01
Also published as: WO2018008306A1; JPWO2018008306A1; CN109477531A; JP6577144B2

Abstract

The invention provides an electromagnetic brake, which is provided with a buffer rubber mounting structure capable of preventing the buffer rubber from protruding from the outer periphery of the upper surface side and touching during compression and realizing long service life. An electromagnetic brake according to the present invention includes a core having a cushion rubber insertion portion formed with a bit tip recess, the electromagnetic brake being characterized in that: the cushion rubber insertion portion has a cushion rubber therein, and the cushion rubber has a through hole penetrating in a thickness direction of the cushion rubber at a central portion thereof, the through hole having a diameter larger than a diameter of the drill tip recess.

Description

Electromagnetic brake device

Technical Field

The present invention relates to an electromagnetic brake device having a cushion rubber mounting structure.

Background

As a background art in this field, Japanese patent application laid-open No. 2005-324955 (patent document 1) is known. This publication describes deterioration of a cushion rubber used in an electromagnetic brake device.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-324955

Disclosure of Invention

Problems to be solved by the invention

However, in the electromagnetic brake device described in patent document 1, the cause of deterioration of the cushion rubber is treated as mixing of foreign matter, and no consideration is given to deterioration caused by deformation of the cushion rubber at the time of impact absorption. In a typical cushion rubber mounting structure, a countersink (counter bore) for relief is formed in the outer periphery of the front surface side of a housing recess (cushion rubber insertion portion) formed by a drill, and cushion rubber is disposed in the housing recess in which the countersink is formed. In a steady state, the cushion rubber passes through the countersink and forms a gap on the upper surface side outer periphery and between the inner peripheral wall of the countersink, but the upper surface side outer periphery of the cushion rubber is exposed from the accommodating recess and touches the upper end outer periphery of the accommodating recess at the time of compression, and the exposed portion is torn.

Therefore, the present invention provides a cushion rubber attachment structure that prevents the upper surface side outer peripheral portion of the cushion rubber from being exposed from the cushion rubber insertion portion and touching the upper end outer periphery of the cushion rubber insertion portion during compression, and that achieves a long life.

Means for solving the problems

In order to solve the above problem, an electromagnetic brake according to the present invention includes a core having a cushion rubber insertion portion, the electromagnetic brake including: the cushion rubber insertion portion has a cushion rubber therein, and the cushion rubber has a through hole penetrating through the cushion rubber in a thickness direction thereof at a central portion thereof.

Effects of the invention

According to the present invention, the upper surface side outer peripheral portion of the cushion rubber can be prevented from protruding from the cushion rubber insertion portion and touching the upper end outer peripheral portion of the cushion rubber insertion portion during compression, and a long life can be achieved. Problems, structures, and effects other than those described above will be apparent from the following description of the embodiments.

Drawings

Fig. 1 is a front view of a hoist having an electromagnetic brake device to which a cushion rubber mounting structure of an embodiment of the present invention is applied.

Fig. 2 is a rear view of a hoist having the electromagnetic brake device shown in fig. 1.

Fig. 3 is a plan view of one disc brake device of the electromagnetic brake device shown in fig. 1.

Fig. 4 is a sectional view of a main portion of the disc brake device shown in fig. 3.

Fig. 5 is a sectional view showing a main part of the cushion rubber mounting structure shown in fig. 4.

Fig. 6 is a cross-sectional view showing compression of the cushion rubber in the cushion rubber mounting structure shown in fig. 5.

Fig. 7 is a sectional view showing a cushion rubber mounting structure according to another embodiment of the present invention.

Fig. 8 is a cross-sectional view showing the cushion rubber mounting structure shown in fig. 7 at the time of compression.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1

Fig. 1 and 2 are front and rear views of a hoist including an electromagnetic brake to which a cushion rubber mounting structure of the present invention is applied.

The hoist 100 is configured on a fixed base (not shown). The housing 30 of the hoist 100 is attached to a fixed base, and the rotating shaft 1 of the hoist 100 is rotatably supported by the housing 30 via a bearing (not shown). A sheave (regenerative) 2 and a brake disk 3 having a larger diameter are coaxially fixed to a rotary shaft 1 of the hoist 100. A stator (not shown) and a rotor (not shown) that constitute a motor are housed inside the housing 30 of the hoist 100, and the rotor is provided on the rotating shaft 1 side. Support arms 40 and 50 are attached to bearing portions of frame 30 that support rotary shaft 1, and disc brake devices 4 and 5 are attached to distal

end attachment portions

41 and 51 of support arms 40 and 50, respectively. The disc brake devices 4, 5 are of the same construction. Next, one disc brake device 4(5) will be explained.

Fig. 3 and 4 are a plan view and a main part sectional view of the disc brake device 4.

The disc brake device 4 includes: an armature (amateur)8 including an electromagnetic coil 6 and a compression spring 7; and a core 9 disposed opposite the armature 8. The disc brake device 4 is configured to press

brake pads

10 and 11, which are called calipers, against both surfaces of the brake disc 3 to generate a braking force with respect to the brake disc 3.

The brake pad 10 is fixed to a brake body 13 by fastening a stroke adjustment bolt 12 for adjusting an operating distance during braking. In contrast, the brake pad 11 is coupled to the armature 8 and is configured to be movable in a braking direction in contact with the brake disc 3 by the armature 8.

As shown in fig. 4, an annular housing recess 14 in which the electromagnetic coil 6 is disposed is formed in the core 9, a plurality of spring insertion portions 15 for disposing the compression springs 7 are dispersedly formed in an outer peripheral portion of the housing recess 14, and a plurality of cushion rubber insertion portions 16 for disposing cushion rubber are formed in the vicinity of the spring insertion portions 15.

Fig. 5 is a sectional view showing a main part of the cushion rubber mounting structure.

A cushion rubber insertion portion 16 is formed on the core 9 side, and a drill tip recess 17 is formed in the center of the tip (bottom). The cushion rubber 18 disposed in the cushion rubber insertion portion 16 is made of, for example, silicone rubber, and a through hole 19 having a diameter D1 slightly larger than the diameter D2 of the bit front end concave portion 17 is formed in the center portion. Further, a chamfered end portion 20 is formed on the outer peripheral portion of the cushion rubber 18 on the armature 8 side.

The chamfered end portion 20 is a portion in which a radial direction region L1 in which the outer diameter gradually decreases from the outer peripheral portion toward the center side is formed in a region of a thickness direction dimension L2 from the upper surface of the cushion rubber 18. The thickness direction dimension L2 is slightly larger than the projection dimension H between the upper surface of the cushion rubber insertion portion 16 of the core 9 and the upper surface of the cushion rubber 18 in a steady state (substantially uncompressed state). Therefore, a part of the chamfered end portion 20 of the cushion rubber 18 enters into the cushion rubber insertion portion 16 in a stable state.

The outer diameter of the cushion rubber 18 is slightly smaller than the inner diameter of the cushion rubber insertion portion 16, and a gap is formed between the inner peripheral wall of the cushion rubber insertion portion 16 and the outer peripheral portion of the cushion rubber 18 in a steady state. Further, a concave portion 21 having a reduced outer diameter is formed annularly at an intermediate portion in the thickness direction of the outer peripheral portion of the cushion rubber 18.

The annular recess 21 has a height dimension of about 0.3t with respect to the thickness t of the cushion rubber 18, and a radial depth of about 0.05D with respect to the outer diameter D of the cushion rubber 18. The cushion rubber 18 is also chamfered when the recess 21 is formed. The recess 21 is a relief portion when the cushion rubber 18 is deformed, similarly to the through hole 19.

Fig. 6 is a cross-sectional view showing the cushion rubber 18 when compressed.

Since the chamfered end portion 20 is formed on the outer peripheral portion on the upper surface side of the cushion rubber 18, the through hole 19 penetrating in the thickness direction is formed in the central portion of the cushion rubber 18, and the annular concave portion 21 having a reduced outer diameter is formed in the central portion in the thickness direction of the cushion rubber 18, even when the cushion rubber 18 is compressed, the amount of deformation of the cushion rubber 18 is mainly absorbed by the relief portions of the through hole 19 and the concave portion 21, and the deformation of the upper surface side end and the lower surface side end of the through hole 19 is suppressed as compared with the axial central portion of the through hole 19. Therefore, the chamfered end portion 20 does not touch (straddle) the upper surface side of the core 9. Therefore, even if the cushion rubber 18 is rapidly compressed by the armature 8, the upper surface side outer peripheral portion of the cushion rubber 18 does not come into contact with the edge of the cushion rubber insertion portion 16 of the core 9 as in the conventional art, and no protrusion is generated, so that the problem of tearing of the protrusion in the conventional art does not occur, and a long life can be achieved.

In addition, in general, if a drill is used when forming the cushion rubber insertion portion 16, a drill tip concave portion (conical concave portion) 17 is formed in the center of the tip (bottom) of the cushion rubber insertion portion 16, and the cushion rubber 18 contacts the edge of the drill tip concave portion 17, whereby the portion of the cushion rubber 18 is also damaged. However, since the through hole 19 penetrating in the thickness direction is formed in the center of the cushion rubber 18 and the diameter of the through hole 19 is made larger than the diameter of the bit tip concave portion 17, the edge of the bit tip concave portion 17 can be prevented from being damaged by deformation of the cushion rubber 18 during compression, and the life can be prolonged.

Further, by forming the chamfered end portion 20 so that the thickness direction region L2 > the diameter direction region L1, the dimension W other than the chamfered end portion 20 of the cushion rubber 18 can be increased, and a decrease in the spring constant of the cushion rubber 18 can be suppressed as much as possible.

Further, by forming the thickness direction region L2 > the projecting dimension H, even when the cushion rubber 18 is compressed, the amount of deformation of the cushion rubber 18 can be suppressed, and the chamfered end portion 20 can be more reliably prevented from touching the upper surface side of the core 9.

And, by forming into

Since the concave portion 21 having a reduced outer diameter is formed annularly at the center portion in the thickness direction of the cushion rubber 18, even if the cushion rubber 18 deforms toward the through hole 19 during compression, the deformation of the upper surface side end and the lower surface side end is suppressed as compared with the deformation of the axial center portion of the through hole 19. Therefore, the cushion rubber 18 does not contact the edge of the cushion rubber insertion portion 16 of the core 9 or the edge of the bit tip recessed portion 17, and deterioration due to the edge of the cushion rubber insertion portion 16 or the edge of the bit tip recessed portion 17 can be prevented, and the life can be prolonged.

Example 2

Fig. 7 and 8 are sectional views showing a stable state and a compressed state of a cushion rubber mounting structure according to another embodiment of the present invention.

A cushion rubber insertion portion 16 is formed on the core 9 side, and a drill tip recess 17 is formed in the center of the tip. The cushion rubber 18 disposed in the cushion rubber insertion portion 16 is made of, for example, silicone rubber, and a through hole 19 having a diameter D1 slightly larger than the diameter D2 of the bit distal end concave portion 17 is formed in the central portion. Further, a small diameter portion 23 is formed at an upper outer peripheral portion of the cushion rubber 18 so as to form an annular gap 22 serving as a relief portion with an inner wall surface of the cushion rubber insertion portion 16, and a large diameter portion 24 is formed at a lower outer peripheral portion so as to form only a very small gap with the inner wall surface of the cushion rubber insertion portion 16. The annular gap 22 formed by the small diameter portion 23 formed in the upper outer peripheral portion of the cushion rubber 18 is deeper than the upper surface of the core 9, and forms a necessary relief portion together with the through hole 19. In addition, the upper surface of the cushion rubber 18 protrudes from the upper surface of the core 9 in a steady state.

Fig. 8 is a sectional view showing the cushion rubber 18 when compressed.

By forming the through hole 19 penetrating in the thickness direction in the central portion of the cushion rubber 18 and forming the annular gap 22 in the outer peripheral portion of the cushion rubber 18, even when the cushion rubber 18 is compressed, the amount of deformation of the cushion rubber 18 is mainly absorbed by the through hole 19 and the gap 22, and deformation of the upper surface side end and the lower surface side end of the through hole 19 is suppressed as compared with the axial central portion of the through hole 19. Therefore, the upper surface side outer peripheral portion of the cushion rubber 18 does not touch the upper surface side of the core 9. Therefore, even if the cushion rubber 18 is rapidly compressed by the armature 8, the upper surface side outer peripheral portion of the cushion rubber 18 is not absorbed by the gap 22 and does not come into contact with the edge of the cushion rubber insertion portion 16 as in the related art, and a protruding portion is not generated.

In addition, in general, if a drill is used for forming the cushion rubber insertion portion 16, the drill tip recess 17 is formed in the center of the tip thereof, and the cushion rubber 18 touches the edge of the drill tip recess 17, so that the cushion rubber 18 is damaged at that portion. However, since the through hole 19 penetrating in the thickness direction is formed in the center of the cushion rubber 18 and the diameter of the through hole 19 is made larger than the diameter of the bit tip concave portion 17, the edge of the bit tip concave portion 17 can be prevented from being damaged by deformation of the cushion rubber 18 during compression, and the life can be prolonged.

The present invention is not limited to the above-described embodiments, and various modifications may be made. The cushion rubber mounting structure using the cushion rubber 18 is not limited to the disk brake device and the electromagnetic brake device having the illustrated configurations, and can be applied to various configurations.

Description of the symbols

6 … electromagnetic coil, 7 … compression spring, 8 … armature, 9 … core, 15 … spring insertion part, 16 … buffer rubber insertion part, 17 … drill bit front end concave part, 18 … buffer rubber, 19 … through hole, 20 … chamfer end part, 21 … concave part, 22 … gap, 23 … small diameter part.

Claims

1. An electromagnetic brake including a core having a cushion rubber insertion portion, characterized in that:

a cushion rubber having a through hole penetrating through the cushion rubber in a thickness direction at a central portion thereof is provided in the cushion rubber insertion portion,

a bit tip recess is formed in the center of the bottom of the cushion rubber insertion portion, and the through hole has a diameter larger than that of the bit tip recess.

2. The electromagnetic brake of claim 1, wherein:

having an armature disposed opposite the core,

the cushion rubber has a chamfered end portion whose diameter is gradually reduced toward a direction in which a compression force acts on the cushion rubber, at an outer peripheral portion of a surface side in contact with the armature.

3. The electromagnetic brake as claimed in claim 1 or 2, characterized in that:

the cushion rubber has an annular recess at a central portion in a thickness direction of an outer peripheral portion thereof.

4. The electromagnetic brake of claim 1, wherein:

the armature is disposed opposite to the core, and the cushion rubber has a small diameter portion at an outer peripheral portion of a surface side in contact with the armature, so that an annular gap is present between the armature and an inner wall surface of the cushion rubber insertion portion in a stable state.