JPH0424184Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is used in electromagnetic armature actuating devices such as electromagnetic clutches and electromagnetic brakes to constantly adjust the gap between the armature and the attracting surface of a rotor, etc., when the armature is released. The present invention relates to an automatic air gap adjustment device for.

[Prior Art] When the armature of an electromagnetic clutch/brake is released, the gap between the armature and the armature suction surface must always be maintained at a constant value, and the armature suction time by coil excitation must always be kept constant. This is because as the number of times the electromagnetic clutch/brake engages and brakes increases, the friction surfaces wear out and the air gap widens.The armature suction time due to coil excitation becomes longer, slowing down the engagement/braking operation, and furthermore, the air gap widens. This is because if the coil is energized, the attraction force will not be applied to the armature, resulting in a failure in which connection and braking will not occur, so it is necessary to prevent this.

Conventionally, a device disclosed in Japanese Utility Model Publication No. 13143/1983 is known as a device for automatically adjusting the gap and preventing the occurrence of such defects. This device uses a single leaf spring to prevent rattling due to backlash in the drive part, and the leaf spring is constructed so that the amount of deflection increases as the armature and suction surface wear out. ing.

[Problem that the invention attempts to solve]

Therefore, as the amount of deflection of the leaf spring increases, the return elasticity of the armature also increases, and the armature is held with a large spring force.
Therefore, when the armature is attracted by the magnetic force, it moves in the direction of the attracting surface against this large spring force, resulting in a defect that the response becomes poor.

The present invention aims to eliminate the above defects.

[Means to solve problems]

In order to achieve the above object, the present invention provides that when the armature 21 is attracted to the armature suction surface 8a when the gap between the armature 21 and the armature suction surface 8a is larger than a predetermined size, the gap adjustment shaft body 18 a first leaf spring 14 that engages with the first leaf spring 14;
a is the armature suction surface 8 by the increase in the gap.
In a device configured to move in the a direction, the armature 21 is placed opposite to the armature suction surface 8a with a predetermined gap G1, and the armature 21 is moved to the second armature suction surface 8a.
The first leaf spring 14b is fixed to the first leaf spring 14b.
a is fixed in a proper position on the armature holder 12, the first and second leaf springs 14a and 14b are constituted by a single leaf spring 14, and two different concentric circles S1 of the single leaf spring 14 are formed. , S2, and the second leaf spring 14b is formed along the other concentric circle S2, and the first leaf spring 14a is formed along the other concentric circle S2.
The original shape holding force of the second leaf spring 14b is set to be larger than that of the second leaf spring 14b, and a means for maintaining the deflected state of the first leaf spring 14a is provided.

[Effect]

In the above configuration, when the gap between the armature 21 and the attraction surface 8a increases, when the armature 21 is attracted to the attraction surface 8a by magnetic force, the shaft body 1
8 deflects the first leaf spring 14a and moves in the direction of the suction surface 8a by the increase in the gap against the elasticity of the leaf spring 14a. At this time, the deflection retaining means retains the first leaf spring 14a in a deflected state. When the magnetic force acting on the attraction surface is eliminated, the armature 21 is moved to the attraction surface 8 by the second leaf spring 14b.
a and returns to its original position with respect to the shaft body 18. At this time, the first leaf spring 14a maintains a bent state due to the increase in the gap, so the armature 21 faces the suction surface 8a with the initially set gap G1, and The increase will be automatically corrected.

〔Example〕

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

In FIGS. 1 and 2, 2 is a stator of an electromagnetic clutch 4, which has a built-in coil 6. 8 is a rotor, and an amateur suction surface 8a made of a lining is formed on the rotor. 10 is a hub, and a plate-shaped armature holder 12 is fixed to this. Reference numeral 14 designates a ring-shaped leaf spring, in which a plurality of first leaf springs 14a are formed along a concentric circle line S1, and a plurality of second leaf springs 14b are formed along a concentric circle line S2.
It is integrally formed along the The first leaf spring 14a is fixed to the armature holder 12 by a rivet 16. Second leaf spring 1
4b is fixed to armature 21 by rivets 19. Reference numeral 18 denotes a shaft for adjusting the gap, to which the intermediate portion of the leaf spring 14a is fixed. The shaft body 18 is connected to the armature 21
The shaft body 18 is loosely fitted into a stepped hole 26 provided through the shaft body 18.
One side of the flange 18a formed in the hole 26
It faces the bottom of the large diameter part of. A pin 28 has an annular portion 28a loosely fitted to the shaft body 18, and the pin 28 is inserted between the leaf spring 14 and the holder 12. The pin 28 has linear portions 28b and 28c formed at both ends thereof, and the linear portions 28b and 28c are biased in a direction in which they diverge from each other.

The original shape retaining force of the leaf spring 14a is set to be larger than the original shape retaining force of the leaf spring 14b within a predetermined range, and the attractive force of the attraction surface 8a to the armature 21 due to the excitation force of the coil 6 is set to be larger than the original shape retaining force of the leaf spring 14b. It is set considerably larger than the original shape holding force of the spring 14a.

Next, the operation of this embodiment will be explained.

Before the amateur suction surface 8a wears out, first,
The straight portions 28b and 28c of the pin 28 are bent to be substantially parallel to each other against the elasticity of the pin 28. In this state, the armature 21 and the armature suction surface 8a face each other with a predetermined gap G1, and the back surface of the flange 18a of the shaft body 18 and the hole 2
The bottom surface of the large diameter portion of No. 6 faces the bottom surface of the large diameter portion with a gap G2 which is the same as the gap G1 described above. When a current flows through the coil 6, the armature suction surface 8a of the rotor 8
A magnetic flux is generated, and the armature 21 comes into close contact with the attracting surface 8a of the rotor 8 due to the magnetic force, and the rotor 8 side and the hub 10 side are connected. When the armature 21 is attracted to the attraction surface 8a, if there is no wear on the attraction surface 8a, only the armature 21 moves in the direction of the rotor 8 due to the deflection of the leaf spring 14, and the shaft body 1
8 does not move relative to the armature holder 12. However, when wear occurs between the armature 21 and the suction surface 8a, the gap between them becomes G1+
α (wear amount) becomes larger than the initially set gap G1. Therefore, in this state amateur 21
is magnetically attracted to the attraction surface 8a, the amateur 2
The bottom surface of the large diameter portion of the stepped hole 26 of No. 1 collides with the back surface of the flange 18a of the shaft body 18, and resists the elasticity of the leaf spring 14 to push the shaft body 18 against the suction surface by the above-mentioned wear amount α. Pull it out in the direction 8a. With this movement of the shaft body 18, the fixed portion of the leaf spring 14a to the shaft body 18 protrudes and curves in the direction of the suction surface 8a. Due to the bending of the leaf spring 14a, the straight portions 28a, 2 of the pin 28
8b is displaced in the direction of expansion due to their elasticity, and due to the bending of the leaf spring 14a, the leaf spring 14a
and the armature holder 12. Therefore, even if the coil 6 is de-energized and the armature 21 is separated from the suction surface 8a due to the elasticity of the leaf spring 14b, the bent state of the leaf spring 14a will remain the same as the straight portions 28b, 28c of the pin 28.
The shaft body 18 is held by the wedge action, and the shaft body 18 is not pulled back toward the armature holder 12 but maintains a state of protruding from the armature holder 12.
Therefore, when the armature 21 is returned to its original position by the leaf spring 14b, the amount of friction α is corrected, and the armature 21 faces the suction surface 8a with the initially set gap G1 therebetween.

Furthermore, as shown in FIG.
4 may be configured with a first leaf spring 14a and a second leaf spring 14b. Furthermore, the means for preventing the leaf spring 14a from returning is not particularly limited to what is shown in the drawings.

〔effect〕

As described above, the present invention connects the shaft for adjusting the gap and the armature holder by a first leaf spring, connects the shaft and the armature by a second leaf spring, and Since the leaf spring and the second leaf spring are formed into a single leaf spring along different concentric lines, even if the first leaf spring is bent, this deflection is reflected in the armature of the second leaf spring. There is an effect that the holding elasticity is not affected, the armature can always be operated with an appropriate return elasticity, and the responsiveness of the armature is not impaired.

[Brief explanation of the drawing]

The figures show preferred embodiments of the present invention; FIG. 1 shows a sectional view, FIG. 2 shows a sectional view, FIG. 3 shows a side view, FIG. 4 shows a side view, and FIG. 5 shows another embodiment. This is a side view. 2... Stator, 4... Electromagnetic clutch, 6...
Coil, 8...Rotor, 8a...Adsorption surface, 10...
...Hub, 12...Amachi your holder, 14...
Leaf spring, 14a...first leaf spring, 14b...second leaf spring, 18...shaft, 18a...flange, 1
9...Rivet, 26...Stepped hole, 28...Pin.

Claims (1)

[Scope of utility model registration request] Amateur 21 against the Amateur suction surface 8a
When the gap is larger than a predetermined size,
When the armature 21 is attracted to the armature suction surface 8a, the first leaf spring 14a that engages with the gap adjustment shaft body 18 moves in the direction of the armature attraction surface 8a by the amount of increase in the gap. Amateurs 21 are arranged to face each other with a predetermined gap G1 on the suction surface 8a, and the amateurs 2
1 is fixed to a second leaf spring 14b, the first leaf spring 14a is fixed at a plurality of locations on the armature holder 12 at predetermined intervals, and the first and second leaf springs 14a, 14b are fixed to a single leaf spring 14b. The first leaf spring 14a is formed along one concentric circle S1 of two different concentric circles S1 and S2 of the single leaf spring 14, The second leaf spring 14b is formed along the other concentric circle S2, and the original shape retaining force of the first leaf spring 14a is set larger than the original shape retaining force of the second leaf spring 14b. As a means for maintaining the deflected state of the first leaf spring 14a, a pin 28, which is biased in a direction in which the distance between the mutually opposing parts 28b and 28c increases, is attached to the fixing part of the first leaf spring 14a to the armature holder 12. An automatic gap adjustment device in an electromagnetic armature actuating device, characterized in that the device is disposed between the first leaf spring 14a and the armature holder 12, and between opposing surfaces of the armature holder 12.