JPS603404Y2 - Simple air gap adjustment device for electromagnetic clutches and brakes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple gap adjustment device for an electromagnetic clutch/brake, which allows easy gap adjustment during assembly and use of the clutch and brake.

In conventional electromagnetic clutch/brake units, especially in shaft butt type units, as shown in Fig. 1, the clutch stator 3 is fixed to the input side bearing cover 2, and the clutch rotor 7 is fixed to the input shaft 6. has been done.

The input shaft 6 is rotatably connected to the bearing cover 2 via a bearing.

A brake stator 5 is fixed to the output side bearing cover 4, and a tubular armature holder 10.11 for the clutch and brake is fixed to the output shaft 9.

The output shaft 9 is rotatably supported by the bearing cover 4 via a bearing.

A plurality of ring-shaped leaf springs (not shown) are fixed to each flange portion of the holder 10.11, and ring-shaped armature plates 1 are fixed to the other plurality of parts of the leaf spring.
2.14 are fixed, the armature plates 12.14 facing the rotor 7 and the stator 5, respectively.

As shown in the opening of FIG. A plurality of plates of shims 16 and collars 14 are arranged.

The shim 16 is made of a ring-shaped thin plate, and is slidably inserted into the output shaft 14.

In the above configuration, 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, the rotor 7 and armature plate 1 of the electromagnetic clutch
2 and the stator 5 and armature plate 14 of the electromagnetic brake
The opposing gaps between them must be at an appropriate distance.

The armature holder 10 for the clutch is fixed with a set screw (not shown [11)] so that the armature plate 12 faces the rotor 7 with a prescribed gap.

Further, in order to adjust the position of the brake armature holder 11 keyed to the output shaft 9, the shim 16 is used in advance as described above.

The opposing gap between the rotor 7 and the armature plate 12 or the stator 5 and the armature plate 14 is 0.211r! IL or 0.
The gap is very narrow, such as 3 mm, and the armature holder 10.1 has been pre-assembled once before assembly, but if the specified gap is not achieved during the first assembly, the armature holder 10.1 should be inserted from the output shaft 9.
1, and fix the armature holder 10 in an accurate position using a set screw.

In the case of the armature holder 11, a shim 16 is inserted or removed to adjust the space between the armature plate 14 and the stator 5 to a specified gap.

However, the output shaft 9 and the armature holder 10.
11 is in such a fitting relationship that it can be press-fitted with a press or the like, so the armature holder 10.11 can be connected from the output shaft 9 to the armature holder 10.
A special jig was required to disassemble it, and it took time to adjust the air gap.

Furthermore, when the unit is in use, the linings 18, 19 which are adhered to the clutch rotor 7 or the brake stator 5 naturally wear out due to contact with the armature plate 12, 14, and the clutch rotor 7 or the brake stator 5 As a result, the specified air gap between the armature plates 12.14 becomes larger, and the magnetic force acting on the armature plates 12.14 changes, resulting in poor clutch and brake performance, and air gap adjustment becomes necessary.

In this case, remove the bearing cover 4 from the drum 1, then remove the clutch and brake armature holders 10 and 11 attached to the output shaft 9, and adjust the fixing position with set screws and increase or decrease the number of shims 16. However, when it was disassembled, the output shaft 9 and armature holder 10 and 11 were firmly inserted, so they could not be removed without a jig, and the unit itself had to be disassembled.

In addition, the output shaft 9 and the armature holder 10.11 are attached to the output shaft 9 and the armature holder 10.11 using a press or the like.
After press-fitting the
When FF is used, lining 18.19 and armature plate 1
Temporary slippage occurs between 2.14 and 2.14 seconds, which generates heat and becomes quite high.

For this reason, the output shaft 9 and armature holder 10°11
causes thermal expansion, but the output shaft 9 is generally made of carbon steel for mechanical structures, but the armature holder 10
．． Since the hub portion 11 is made of a non-magnetic material and there are restrictions to reduce the inertial force, aluminum is generally used.

For both of these materials, aluminum has a higher coefficient of thermal expansion, and when the clutch/brake becomes hot, the hub of the armature holder expands more than the output shaft 9. The hub of the output shaft 9 and the armature holder 10.11 It also had the defect that the fit between the parts became loose and the set screws were no longer effective.

The present invention provides a simple air gap adjustment device that can easily adjust the air gap without disassembling the electromagnetic clutch/brake unit and can prevent loosening of the fit between the output shaft and the armature holder due to heat generation. The purpose is to

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In FIG. 2, 20 is a drum, and a clutch bearing cover 22 is attached to one end of the drum.

The clutch stator 24 is attached to the bearing cover 22 by screws 26.
It is stopped by

A bearing cover 28 is attached to the other end of the drum 20,
A brake stator 30 is fixed to the bearing cover 28 with screws.

A clutch rotor 34 is fixed to the input shaft 32,
The input shaft 32 is rotatably supported by the bearing cover 22 via a bearing.

The output shaft 36 has an armature holder 3 for the clutch.
8 and a brake armature holder 40 are inserted, and the output shaft 36 is rotatably supported by a bearing cover 28 via a bearing.

A base 42 is fixed to the drum 20, and a terminal block 44a is attached to the base 42.

A plurality of ring-shaped leaf springs 39, 41 are fixed to each of the flange portions of the armature holder 38, 40, and armature plates 38a, 40a are fixed to the plurality of locations of the leaf springs 39, 41. .

a hub portion 38' of said armature holder 38.40;
Threads 44 and 46 are cut on the outer periphery of 40', respectively.

A plurality of splits 48 are formed in the armature holder hub portions 38', 40' in the axial direction.

The screws 44, 46 are arranged in opposite directions.

That is, if one screw 44 is a right-handed screw, the other screw 46 is set to be a left-handed screw.

Hub portion 38' of said armature holder 38.40.

A clamp nut 50 is screwed into the screws 44 and 46 of 40'.

A right-handed female thread 52 is cut in half of the inner diameter of the clamp nut 50, and a left-handed female thread 54 is cut in the remaining half.

The clamp nut 50 has splits 56 cut in two places in the axial direction.

Screw holes 58 and 60 are drilled in one side wall of the clamp nut 50 with the split 56 as a boundary, and a through hole is drilled in the other side wall located on an extension of the screw holes 56 and 60. , the screw holes 58, 60 and the through holes open in the plane of the split 56.

Bolts 62 and 64 are slidably inserted into the through holes, and the bolts 62 and 64 are screwed into the screw holes 58 and 60.

By screwing the bolts 62, 64 into the threaded holes 58, 60, the clamp nut 50 can be reduced in diameter in the radial direction.

The screw holes 58, 60 and the bolts 62, 64 constitute a screw tightening mechanism.

A key 66 is provided on the output shaft 36 so as to protrude in the axial direction.
Key grooves 68 are bored in the axial direction in 8' and 40'.

A hole 70 is transparently provided in the drum 20, and the clamp nut 50 can be rotated and screwed through the hole 70.

72.74 is a coil, 73.75 is a lining bonded to the rotor 34 and stator 30, 80.82 is a screw hole for a fixing screw 78.76, and the hub portion 38',
It is transparently provided at the end of 40'.

Next, the operation of this embodiment will be explained.

Before attaching the cover 28 to the drum 20, first install the bearing.
Screw the hub parts 38' and 40' of the armature holder into the female threads 52° and 54 of the clamp nut 50, and
Shorten the span between 40 and 40.

Next, the hub portion 38' of the armature holder 38.40
, 40' in a straight line, and each keyway 68
is aligned with the key 66 of the output shaft 36, and in this state, the hub portions 38' and 40' of the armature holder are fitted to the output shaft 36.

The armature holder hub portions 38', 40' are loosely fitted to the output shaft 36 and can be easily inserted by hand.

Next, the bearing cover 28 is attached to the drum 20.

Next, the armature plate 38a is brought into contact with the rotor 34, and the clamp nut 50 is turned in the direction in which the armature holder 40 moves to the right in FIG.
The gap between the armature plate 40a and the armature plate 40a is set to a specified gap.

Then, attach the armature holder hub portion 40' to the output shaft 3.
6 with a set screw 76.

Next, when the clamp nut 50 is rotated in the opposite direction, the armature holder 38 moves in a direction away from the rotor 34.

As a result, the gap between the front surface of the rotor 34, that is, the surface of the lining 73, and the armature plate 38a is set to a specified gap,
After that, tighten the armature holder hub part 38' with screw 7.
8 to the output shaft 36.

Next, when the bolts 62 and 64 are screwed into the screw holes 58 and 60 of the clamp nut 50, the clamp nut 50 contracts in the radial direction, and thereby the armature holder hub portions 38' and 40' also contract in the radial direction. Thus, the armature holder hub portions 38', 40' are firmly coupled to the output shaft 36.

In addition, during use, the lining 73.75 is abraded between the surface of the waist lining 73.75 and the armature plates 38a, 40.
When the opposing gap with a is larger than the specified value, loosen the bolts 62 and 64 of the clamp nut 50 and easily adjust the gap as described above without removing the bearing cover 28 from the drum 20. be able to.

In the above configuration, when the coil 72 is energized, the armature plate 38a moves in the direction of the rotor 34 due to the deflection of the plate spring 39 against the elasticity of the plate spring 39.
It adheres to the lining 73 by magnetic force.

As a result, the rotor 34 and the output shaft 36 are connected and the clutch is engaged.

When the coil 74 is energized, the armature plate 40a
The lining 7 is moved by magnetic force against the elasticity of the leaf spring 41.
5, thereby applying a brake to the output shaft 36.

Furthermore, as an application, it can also be used for a single electromagnetic clutch and brake.

Since the present invention is constructed as described above, it is possible to easily adjust the gap between the electromagnetic clutch and brake without disassembling the unit, and since there is no gap between the output shaft and the armature holder, the so-called fretting phenomenon is eliminated. There are effects such as being able to.

[Brief explanation of the drawing]

Figure 1A is a partially cutaway side view of the conventional design, Figure 1 is the same, enlarged side view, Figure 2 is a partially sectional front view, Figure 3 is a sectional view of the main part, Figure 4 is the armature. An external view of the holder, and FIG. 5 is an external view of the clamp nut. 20...Drum, 22...Bearing cover, 24...Clutch stator, 26...
・Screw, 28...Bearing cover 30...
・Brake stator, 32...Input end, 34・
...Rotor, 36...Output shaft, 38.4
0... Armature holder 42...
・Base, 38', 40'...Hub, 44,4
6...screw, 48...split, 50...
...Clamp nut, 52.54...Female thread, 56...Split, 58,60...Threaded hole, 62,64...Bolt, 66...
・Ki, 68...Keyway, 70...Hole,
80, 82... Screw hole, 76... Set screw, 78... Screw.

Claims (1)

[Scope of utility model registration request] A drum 20 in which a hole 70 is formed, a bearing cover 22.28 attached to both sides of the drum 20, an input shaft 32 rotatably supported by the bearing cover 22, and an input shaft 32 rotatably supported by the bearing cover 28. A supported output shaft 36, a clutch stator 24 fixed to the bearing cover 22, a brake stator 30 fixed to the bearing cover 28, and an input shaft 32 facing the clutch stator 24.
The rotor 34 has a rotor 34 fixed to the rotor 34, a hub portion 38' and a flange portion, and the hub portion 38' slides in the axial direction on the output shaft 36 via a rotation stopper mechanism consisting of a key 66 and a keyway 68. A screw hole 80 for freely fitting and fixing into the knob portion 38' is provided.
a tubular armature holder 38 for the clutch, which is transparently provided, and a leaf spring 39 on the flange portion of the armature holder 38 for the clutch so as to face the rotor 34.
Clutch armature plate 38a attached via
The 711 part 40 has a hub part 40' and a flange part.
' is slidably fitted in the output shaft 36 in the axial direction via a rotation stopper mechanism consisting of a key 66 and a keyway, and a fixing screw hole 82 is transparently provided in the hub part 40'. A tubular armature holder 40, a brake armature plate 40a attached to the flange portion of the brake armature holder 40 via a plate spring 41 so as to face the brake stator 30, and the fixing screw hole 80.82. The armature holder 3 is screwed into the armature holder 3.
In the electromagnetic clutch/brake, which includes fixing screws 78, 76 for fixing the hub portions 38', 40' of 8.40 to the output shaft 36, each of the brake and clutch armature holders 38, 40 Hub part 3
8' and 40' are each provided with a split so that the inner diameter can be displaced in the diametrical direction, and screws 44 and 46 are formed on the outer periphery of the hub parts 3B' and 40' so as to have opposite threads to each other, A clamp nut 50 having internal threads 52 and 54 corresponding to the screws 44 and 46 is screwed onto the screws 44 and 46 of the hub parts 3B' and 40', a split 56 is provided in the clamp nut 50, and the clamp nut 50 A simple gap adjusting device characterized in that a screw tightening mechanism is provided for displacing the inner diameter of the clamp nut 50 in a diametrical direction by bringing opposing surfaces of the split 56 closer together by the tightening force of bolts 62 and 64.