JPH0126908Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic gap adjustment device in an electromagnetic clutch/brake unit.

In a conventional electromagnetic clutch/brake unit, especially in a type in which the input shaft and output shaft are butted, as shown in FIG. 7 are fixed respectively. The input shaft 6 is rotatably supported by the bearing cover 2 via a bearing.

A brake stator 5 is fixed to the output side bearing cover 4, and a clutch and brake armature hubs 10, 11 are fixed to the output shaft 9. Coils 18 and 19 are installed in the stators 3 and 5. The armature hubs 10 and 11 have clutch and brake armatures 12 and 1.
3 are attached alternately via leaf springs 14, 15, and the armatures 12, 13 are attached to the rotor 7 of the clutch.
and is attached to the stator 5 of the brake with gaps g1 and g2 in between. The output shaft 9 is rotatably supported by the bearing cover 4 via a bearing.

In the above structure, the clutch-side bearing cover 2 is attached to one end of the drum 1, and the brake-side bearing cover 4 is attached to the other end. At this time, gaps g1 and g2 between the rotor 7 and armature 12 of the clutch and between the stator 5 and armature 13 of the brake must be at appropriate distances. Collars and shims are inserted in advance so that the positions of armature hubs 10 and 11 of the clutch and brake fixed to the output shaft 9 can be adjusted. When the electromagnetic clutch/brake is operated, the linings 16, 17 and armatures 12, 13, which are bonded to the rotor 7 and the stator 5 of the brake, are inevitably damaged.
As the clutch wears out, the gaps between the rotor 7 and armature 12 of the clutch and the stator 5 and armature 13 of the brake become larger, and the electromagnetic attraction force of the coils 18 and 19 against the armatures 12 and 13 becomes weaker in inverse proportion to the square of the gap distance. As a result, the transmission force or braking force becomes small, and the initial performance cannot be achieved, so air gap adjustment is required.
In this case, the bearing cover 4 was removed from the drum 1, the clutch and brake armature hubs 10, 11 attached to the output shaft 9 were removed, the required number of adjustment shims were removed, and the reassembly was performed. Armature your hub 10, 11
Since it is fixed with a set screw and is tightly fitted, it cannot be easily removed without using a pulley puller or a jig device such as a press, making adjustment very troublesome. .
In addition, various automatic air gap adjustment devices have been devised, one of which is an axial guide hole in the armature mounting plate to which the armature is integrally assembled via a leaf spring, and a friction member is placed inside the guide hole. A guide member is inserted through the guide member, and a stepped screw having a head and a jaw portion on the front side of the guide member is inserted into a hole in the armature. In the brake, a force is applied directly from the armature mounting plate to the stator through the armature from the leaf spring, and the friction member is compressed by the guide hole of the armature mounting plate and the guide member, causing backlash and cracking. In addition, since the friction member is repeatedly compressed, the coefficient of friction between it and the guide hole of the armature mounting plate changes, and a friction force is required that causes the friction member to move in the axial direction due to the magnetic attraction force, but does not move due to the elastic force of the leaf spring. , there was a problem that it became difficult to maintain the above relationship.

Based on the above-mentioned viewpoints, the present invention aims to provide a device with a simple structure and excellent gap adjustment ability.

The present invention is based on an armature mounting plate that can be attached magnetically to the front surface of the rotor of an electromagnetic clutch or the stator of a brake. A friction member is inserted into the surface of the inner diameter portion, and the head of a stepped bolt for fixing the leaf spring to the armature mounting plate is inserted into the hole of the armature, and the length of the head of the stepped bolt is By maintaining a gap corresponding to the gap between the armature and the front of the clutch rotor and brake stator where it is necessary to hold the armature, the stepped part of the head faces the armature hole when not attracted. , aiming to achieve the purpose. The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

The excitation coil 2 is mounted on the bearing cover 22 of the input shaft 25.
A stator 24 of an electromagnetic clutch having a built-in motor 3 is fixed thereto, and a rotor 26 of the clutch is fixed to an input shaft 25, respectively. The input shaft 25 is rotatably supported by the bearing cover 22 via a bearing 27. A lining 28 is glued to the front surface of the rotor 26. An armature 29 of the clutch is disposed opposite to the rotor 26 with a gap G1 therebetween, and one end of a leaf spring S1 is fixed to the armature 29. The other end of the leaf spring S1 is fixed to a clutch armature mounting plate 31 by a stepped bolt 32. The armature 29 has a recess 33 whose inner bottom face faces the head of the stepped bolt 32 across a gap h1 corresponding to the gap G1.

One end of the leaf spring is fixed to the armature mounting plate 31, and the other end of the leaf spring S2 is screwed and fixed to the flange portion 35a of the intermediate hub 35. An O-ring is inserted into the outer peripheral surface of the boss portion 35b of the intermediate hub 35, and the armature mounting plate 3
It is fitted into the inner diameter surface 31a of 1. intermediate hub 3
5 is fixed to the output shaft 36 with a key 37. The output shaft 36 is rotatably supported by a bearing cover 39 via a bearing 38. A stator 41 of an electromagnetic brake containing an excitation coil 40 is fixed to the bearing cover 39 . The stator 4
A lining 48 is glued to the front side of 1.
A brake armature 42 is disposed facing the stator 41 with a gap G2 therebetween, and one end of a leaf spring S3 is fixed to the armature 42. The other end of the leaf spring S3 is fixed to a brake armature mounting plate 44 with a stepped bolt 45. A recess 46 is formed in the armature 43 so that the inner bottom face faces the head of the stepped bolt 45 at a distance h2 corresponding to the gap G2. One end of a leaf spring S4 is fixed to the armature mounting plate 44. The other end of the leaf spring S4 is fixed to the flange portion 35a of the intermediate hub 35 by screwing. An O-ring is inserted into the outer peripheral surface of the boss portion 35C of the intermediate hub 35, and is fitted into the inner diameter surface 42a of the armature mounting plate B42. Bearing cover 22 and bearing cover 39 are attached to both ends of drum 50, and the electromagnetic clutch/brake is housed within the housing comprised of drum 50 and bearing cover. In the electromagnetic clutch/brake unit device constructed as described above, when a voltage is applied to the coil 23 built into the stator 24 of the electromagnetic clutch, a magnetic flux is generated, and the armature 29 is pulled toward the rotor 26 by the magnetic force and the plate is pulled. Spring S1,
30 is bent, and the armature 29 comes into close contact with the lining 28 stretched on the front surface of the rotor 26. As a result, the rotational force on the input shaft 26 side is transmitted to the armature 29 through the rotor 26, transmitted to the armature mounting plate 31 via the leaf spring S1, further transmitted to the intermediate hub 35 via the leaf spring S2, and transmitted to the output shaft 36. .

Next, when a voltage is applied to the excitation coil 40 built in the stator 41 of the electromagnetic brake in order to apply braking to the output side, magnetic flux is generated and the armature B,
42 is pulled toward the stator 41 by the magnetic force, the leaf spring S3 is deflected, and the armature 42 is brought into close contact with the lining 48 glued to the front surface of the stator 41. This applies braking to the output side. Note that the electromagnetic clutch is de-energized at the same time as the electromagnetic brake is energized. When the armature 29 is magnetically attracted to the rotor 26 side, the gap G1 disappears and the armature 29 comes into close contact with the rotor 26. At this time, if the armature 29 and the lining 28 bonded to the front surface of the rotor 26 are not worn, the magnetic force will be applied. As a result, only the armature 29 moves in the axial direction, and the armature mounting plate 31 does not move toward the rotor 26 in conjunction with the armature. armature 2
If there is wear between the gap G1 and the rotor 26, the gap G1 will be larger than the gap G1. Therefore, when the armature 29 is magnetically attracted to the rotor 26 in this state, the bottom surface 33a of the large diameter portion of the stepped hole 33 of the armature 29 comes into contact with the back surface of the flange 32a of the stepped bolt 32, and the stepped bolt 32 is pulled into the rotor. 26 and armature 29
It is pushed toward the rotor 26 by the amount of wear a.
When the stepped bolt 32 is pushed out a distance a toward the rotor 26, the stepped bolt 32 is integrated with the armature mounting plate 31 via the leaf spring S1, so the C armature mounting plate 31 is attached to the boss portion of the intermediate hub 35. 35b is moved in the direction of the rotor 26 by an amount "a" relative to the intermediate hub 35 by the axial deflection of the leaf spring S2 in conjunction with the stepped bolt 32 against the frictional force with the O-ring of the leaf spring S2. Even if the excitation of the coil 23 of the stator 24 is released and the armature 29 returns to the armature mounting plate 31 side due to the elasticity of the leaf spring S1, the tensile force of the leaf spring S2 is greater than the O-ring and the inner diameter surface 31a of the armature mounting plate 31. The frictional force generated in this case is larger, and the armature mounting plate 31 is not returned to the intermediate hub 35 side but remains at that position. Therefore, the return position of the armature 29 is a position where the initially set gap G1 is maintained between the armature 29 and the rotor 26. On the input side, the rotational force is transmitted through the rotor 26, the armature 29, the leaf spring S1, the armature mounting plate 31, the leaf spring S2, and the intermediate hub 35, and is transmitted to the output shaft, so no force in the rotational direction is applied to the O-ring. First, there is no backlash between the intermediate hub 35 and the armature mounting plate 31, and the armature mounting plate 31 can move reliably and smoothly in the axial direction. Also on the electromagnetic brake side, the stator 41, armature mounting plate 44, intermediate hub 35, leaf springs S3, S4, stepped bolts 45,
The ring etc. are the same in construction and operation as the clutch described above. The only difference is that the stator 41 of the brake is used instead of the rotor 26 of the clutch.

Since the present invention is constructed as described above, the wear between the armature and the lining bonded to the rotor and stator can be automatically compensated for, and the gap between them can always be kept constant. The suction force can be maintained constant, the structure is simple, and the operation is reliable.

[Brief explanation of the drawing]

Figure 1 is an external view of the conventional technology, Figure 2 is a sectional view,
FIG. 3 is a side view, and FIG. 4 is a sectional view. 25...Input shaft, 22...Bearing cover, 23...
... Excitation coil, 24 ... Stator, 26 ... Rotor, 27 ... Bearing, 28 ... Lining, 29 ...
... Armature, 31... Armature mounting plate,
35...Intermediate hub, 36...Output shaft.

Claims (1)

[Scope of utility model registration request] Stators 24 and 41 for clutch and brake
The input shaft 2 is attached to a pair of bearing covers 22 and 39 equipped with
5 and the output shaft 36 are rotatably supported substantially coaxially,
In a device in which a rotor 26 is fixed to an input shaft 25 and an intermediate hub 35 is fixed to an output shaft 36, a clutch armature 29 is faced in front of the rotor 27 with a required gap G1, and the armature 29 is
9 is connected to the armature mounting plate 31 for the clutch by a first leaf spring S1, and the armature mounting plate 31 is connected to the flange portion 35a of the intermediate hub 35 via the second leaf spring S2. A first bolt 32 is fixed to a suitable position on either one of the armature mounting plate 31 for the clutch and the armature 29 for the clutch, and the first bolt 32 is fixed to the other of the two so as to be coaxial with the bolt 32. A stepped hole 33 is provided, the bolt 32 is movably disposed in the stepped hole 33, and the back surface of the head 32a of the bolt 32 faces the stepped hole 3.
The inner circumferential surface of the clutch armature mounting plate 31 is placed on the outer circumferential surface of the boss portion 35b of the intermediate hub 35. The brake springs are press-fitted so as to be freely slidable, and apply a frictional force greater than the elasticity of the first and second leaf springs S1 and S2 between the armature mounting plate 31 and the boss portion 35b. The brake armature 42 is exposed to the front surface of the stator 41 with a required gap G2, and the armature 42 is connected to the brake armature mounting plate 44 by a third leaf spring S3. is connected to the intermediate hub 35 via a leaf spring S4, and a second bolt 45 is fixed in a proper position on either the brake armature mounting plate 40 or the brake armature 39, and A second stepped hole 46 is provided on the other side so as to be coaxial with the second bolt 45, and the second bolt 45 is movably disposed in the stepped hole 46. The back surface of the head of the intermediate hub 35 faces the bottom surface of the large diameter portion of the second stepped hole 46 with a gap h2 corresponding to the gap G2 therebetween, and the boss portion 35b of the intermediate hub 35
The brake armature mounting plate 4 is attached to the outer peripheral surface of the brake armature mounting plate 4.
4 is slidably press-fitted, and a friction force greater than the elasticity of the third and fourth leaf springs S3 and S4 is applied to the sliding portion between the armature mounting plate 44 and the boss portion 35b. An automatic gap adjustment device for an electromagnetic clutch/brake unit.