JPS5818535B2 - Air gap adjustment device for electromagnetic clutches and brakes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gap adjustment device for an electromagnetic clutch/brake, and is characterized in that the gap can be manually adjusted from the outside and the gap width can be reliably maintained at a set value.

In an electromagnetic clutch/brake, an electromagnetic coil incorporated in a stator is excited to generate an electromagnetic attraction force, thereby transmitting torque to the output shaft side or performing a brake operation on the output shaft side.

By the way, when electromagnetic clutches and brakes are used for a long period of time, the rotating and frictional bodies (clutch armature and rotor, brake nermature and brake stator) become damaged due to wear.
The air gap between the brakes expands beyond the set value, and as a result, torque transmission and braking operation gradually become delayed, making it difficult to obtain stable operation.

Moreover, if the air gap further expands, torque transmission and braking operations become completely impossible.

In order to solve these drawbacks, various gap adjusting devices have been proposed in the past.

As shown in FIG. 1, the conventional air gap adjusting device has an annular leaf spring d arranged concentrically with respect to the output shaft i, and the leaf spring d is connected to the housing by bolts (not shown) at more than ten points on its circumference. It is fixed on the C side, and on the left side of the leaf spring d,
Annular stator mounting plate j that supports the brake stator e
It is fixed by long-head bolts f which are screwed together from the outside of Uzing C through through-holes and which are inserted into several places on the circumference of the stator mounting plate, and the long-head bolt f is attached to the right side of Uging C. is made up of an adjusting ring l that is screwed into a male threaded part k and arranged in contact with each other, and the gap between the clutch armature a and the holder 25 can be adjusted by appropriately rotating the adjusting ring l. The long head bolt f in contact with the ring 1 and the stator mounting plate j into which the long head bolt is inserted are moved to the left against the repulsive force of the leaf spring d, and the stator mounting plate j is moved in the axial direction. The air gap between the armature a and the rotor b, which are linked to the stator e, was adjusted by appropriate movement.

In this conventional air gap adjustment device, the leaf spring d reliably prevents rotation of the stator mounting plate j and members linked thereto in the circumferential direction, and also serves to achieve smooth and rapid movement in the axial direction. However, in this conventional device,
Since the stator mounting plate j is attached to the housing C only through the leaf spring d, when switching from brake operation to clutch operation, the clutch stator g is energized and the brake stator e is energized. Even if the brake stator e stops, the brake armature h remains attached to the brake stator e due to the residual magnetism of the brake stator e and does not separate from the brake stator e, and the electromagnetic attraction force on the clutch stator g side causes the clutch armature a, The part consisting of the brake armature h, the brake stator e, and the stator mounting plate j moves as one to the left against the repulsive force of the leaf spring d, thus keeping the brake applied to the output shaft side. An inconvenient situation is likely to occur where the torque is transmitted by using the conventional method (which was a problem in the prior art).

Therefore, the present invention solves the drawbacks of the prior art by arranging an adjustment nut on the inner surface of the output housing, screwing the stator mounting plate onto the nut, and screwing the stator mounting plate and the adjustment nut together. , the purpose is to maintain the stator mounting plate that holds the brake stator in a semi-fixed state.

The structure of the present invention will be explained with reference to the illustrated embodiment. In the drawings, 1 is an input shaft, 2 is an output shaft, and 3 is a clutch rotor with a lining L1 fixed to the input shaft.

A clutch stator 4 containing a built-in electromagnetic coil is disposed outside the clutch rotor, and the stator is fixed to an input housing 5 that holds an input shaft system via an arbitrary connecting means.

On the other hand, inside the clutch rotor 3, a clutch armature 6 is arranged with a predetermined gap G1, which is integrally connected to the brake armature T by a rod. and is flexibly connected to an armature bubble 8 located between both armatures 6 and 7 via a ring-shaped leaf spring S1.

9 is a brake stator that has a lining L2 on its contact surface and a built-in electromagnetic coil, and an armature 6 that is integrally connected by a rod.When the clutch operates to move leftward in Fig. 2, the brake stator is For amateur 7
A gap G2, which is equal to the gap G1, is created outside of the gap G1.

A stator mounting plate 10 fixedly holds the brake stator 9, and is made of a cylinder with an outward flange having a substantially T-shaped cross section, and a threaded portion 11 is formed on the outer periphery of the cylinder.

Reference numeral 12 designates a ring-shaped adjustment nut that is screwed onto the stator mounting plate 10, and has a threaded portion 13 formed on its inner circumferential surface.
the stator mounting plate 10 and adjustment nut 12.
are screwed together.

Numeral 14 is a bolt for fixing the adjustment nut 12 to the output housing 15, and has elongated holes 16 drilled at predetermined intervals on the wall surface of the output housing and round holes 17 bored at equal intervals on the side surface of the adjustment ring. It is inserted in a state where it connects.

Here, at least three or more round holes 1γ are exposed in the elongated hole 16 of the output housing.

Similar to Sl, S2 is a ring-shaped leaf spring that is elastic only in the axial direction, and flexibly connects the stator mounting plate 10 to the output housing 15.

In the present invention having the above configuration, the electromagnetic clutch
Due to long-term use of the brake, the clutch armature 6
If the gap G between the output housing 15 and the clutch rotor 3 or the gap G2 between the brake armature 7 and the brake stator 9 becomes larger than the set value due to wear,
The adjusting nut 12 is rotated from the outside through the elongated hole 16, the stator mounting plate 10 is screwed inward in parallel with the output shaft 2, and the brake stator 9 is moved toward the clutch stator 4 by the wear width. By this, the gap G1. G
2 can always be kept at the set value.

Specifically, the adjustment nut 12 is rotated by pushing in the rotational direction the bolt 14 that is inserted into the round hole 17 of the adjustment nut 12 through the elongated hole 16. When reaching near the end, the bolt 14 is pulled out from the round hole 17, inserted into another subsequent round hole 17, and the adjusting nut 12 is sequentially rotated.

By rotating the adjustment nut 12, the stator mounting plate 10 is moved in the direction of the brake armature 7, and the adjustment is made while measuring with a feeler gauge etc. so that the gap G between the clutch rotor 3 and the clutch armature becomes a specified value. Rotate the nut 12.

When the gap G reaches the specified value, tighten the bolt 14.
The housing 15 and the stator mounting plate 10 are fixed.

As described above, the present invention allows the brake stator to be held in a semi-fixed state after adjustment by screwing the adjusting plate -y F with the stator mounting plate that supports the brake stator, so that clutch operation and brake operation are not affected. This has the effect of being able to always maintain an appropriate clearance during the process, thereby enabling stable and accurate torque transmission and braking.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical cross-sectional view showing the main structure of the prior art, Figs. 2 to 4 show an embodiment of the present invention, and Fig. A vertical cross-sectional view showing the configuration of the electromagnetic clutch/brake, Figure 3 is a right side view of Figure 2 with the output shaft removed,
FIG. 4 is a perspective view showing the structure of the stator mounting plate and adjustment nut. Explanation of symbols, (prior art) a...clutch armature, b...clutch opening, C...housing,
d... Leaf spring, e... Brake stator, f...
Bolt, g...clutch stator, h...armature for current use. (Invention of the present application) 1... Input shaft, 2... Output shaft, 3...
・Clutch rotor, 4...Clutch stator, 5...
・Input housing, 6...Clutch armature,
7... Armature for puff rake, 8... Armature bubble, 9... Brake stator, 1o... Stator mounting plate, 11.13... Threaded part, 12... Adjustment nut, 14... Bolt , 15... Output housing, 16... Long hole, 17... Round hole, G... Gap, L
... Lining, S... Leaf spring.

Claims (1)

[Claims] 1 A clutch stator 4 with a built-in electromagnetic coil fixed to a human-powered housing 5, and a lining L1 fixed to the input shaft 1 on the free end side of the clutch stator 4 and on the sliding surface.
A clutch that is movable in the axial direction and immovable in the rotational direction is formed by connecting the clutch rotor 3 provided with the clutch rotor 3 and the r-mature hub 8 facing the clutch rotor 3 and fixed to the output shaft 2 via a leaf spring S1. and a brake armature 7 integrally connected to the clutch armature 6 with a rod through an armature bubble 8.
In an electromagnetic clutch brake consisting of a brake stator 9 with a built-in electromagnetic coil that faces the brake armature 7 and has a lining L2 on its sliding surface, the brake stator 9 is linked to the output housing 15. The flange side surface of a stator mounting plate 10 having a flange and a boss portion is fixed to the output shaft side side surface of the stator mounting plate 9, and the stator mounting plate 10 is attached to the output housing 15 via a ring-shaped leaf spring S2. An adjusting nut 12 having a cylindrical shape and having a round hole 17 on the side surface is screwed into the threaded portion of the boss portion of the stator mounting plate 10. A gap adjustment device for an electromagnetic clutch/brake, characterized in that a bolt 14 is inserted into the round hole 17 from outside of an elongated hole 16 provided on the wall surface of the output housing 15 and opening on the same circumference.