JPS60121327A - Device for adjusting gap of electromagnetic clutch brake - Google Patents

Abstract

PURPOSE:To prevent the play of the members of an electromagnetic clutch and the deterioration of its key, by interposing an elastic member between a rotor and a support for an armature and using a screw to push the elastic member to the rotor through the support. CONSTITUTION:An armature 10, which faces the magnetic pole portions 7, 8 of a rotor 4 and a friction member 9 across a gap (g), is supported on an output hub 13. An annular planar spring 17 for adjusting the gap (g) is fitted together with a spacer coller 18 on a center shaft 3 between the rotor 4 and a bearing 15. The planar spring 17 is pushed to the rotor 4 through the spacer coller 18 by tightening a nut 19 engaged on the end portion of the center shaft 3. The gap (g) can be adjusted to an optional magnitude by turning the nut 19.

Description

Detailed Description of the Invention - Relating to an electromagnetic clutch that is brought into pressure contact with the friction surface on the motor side to transmit torque between a person and the output shaft or to apply braking to a braked object, or a gap adjustment device for the friction surface of the brake. It is an object of the present invention to provide a device that is easy to adjust and can prevent the rotor, armature support member, etc. from floating.

Embodiments in which the present invention is applied to an electromagnetic clutch will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a field core that houses an excitation coil 2, and is supported via a bearing 5 on a hub of a rotor 4, which is fitted onto a central shaft 3, which is an output shaft, using a key or the like. In order to form a magnetic path between the rotor 4 and the field core 1, the rotor 4 has an annular portion facing the forward-inclined portion of the field core 1, and also has arcuate long holes 6 arranged in a row on the same circumference. An inner magnetic pole part 7 and an outer magnetic pole part 8 are formed, and a friction member 9 is embedded in the front surface between the inner and outer magnetic pole parts. 10 is the magnetic pole part 7 of the rotor 4,
8, and a friction member 9, separated by a gap g), is crimped to a leaf spring 12 by a rivet 11 on the opposing armature, and is supported on the armature hub 13 by attaching this leaf spring to this hub with a bolt 14. .

The hub 13 is supported on the central shaft 3 by a bearing 15, and an input pulley 16 is integrally formed on the periphery.

Reference numeral 17 denotes an annular disc spring for adjusting the gap g, which is fitted together with a distance collar 18 into the center shaft 3 between the rotor 4 and the bearing 15, and is tightened with one nut screwed onto the shaft end of the center shaft 3.] G''J is pressed to the tar side via the distance collar 18.

The disc spring 17 is pressed against the rotor 4 via a distance collar 18, but the distance collar may be omitted and the disc spring 17 may be pressed directly against the end face of the inner ring of the bearing 15. Alternatively, the disc spring 17 may be pressed against the rotor 4 via a distance collar 18. In short, when the nut 19 is loosened, any elastic body that has sufficient elasticity to push the bearing 15 back toward the nut in response to the retreat of the nut may be used, and an elastic body may be used. The location may be not between the rotor 4 and the bearing 15, but between the rotor arm and the inner end surface of the hub 13.Furthermore, instead of the nut 19, a flange may be provided at the end of the central shaft 30, and this flange portion An axial screw hole is provided in the screw hole, and a bolt screwed into the screw hole is rotated to apply an axial force similar to the bearing 15, thereby pressing the disc spring 18, which is an elastic body, against the rotor 4. good. 20
is a washer for preventing rotation of nut 19. Nut 1 of bearing 15
9 and d3 and is fitted into the central shaft 3. Reference numeral 21 denotes an arm for fixing a portion of the field core 1 so that it does not rotate during operation, and one end is fixed to the back surface of the field core 1, and the other end is fixed to a suitable position of the machine in which the electromagnetic clutch is used.

The embodiment of the present invention is configured as described above, and when a current is supplied to the excitation coil 2, a magnetic flux flows in a magnetic path (not shown by a broken line), and the armature 10 is moved by the magnetic attraction force to the magnetic pole part 7 on the rotor 4 side.
, 8 and are brought into pressure contact between the magnetic pole portion and the friction member 9, and the rotation of the pulley 16 side is caused by the leaf spring 12. It is transmitted to the central shaft 3 side which is the output shaft via the armature 10° and the rotor 4, and if the current of the exciting coil 2 is cut off, the electromagnetic attractive force to the armature 10 disappears, so the armature is moved by the restoring force of the leaf spring 12. It returns to the original position shown, and the transmission of rotational force to the central shaft 3 is interrupted.

This operation is basically the same as that of conventional electromagnetic clutches of this type, but in this embodiment, when the nut 19 is tightened, the bearing 15.
and the distance collar 18 are slid to the right on the center shaft 3 while deflecting the disk spring 17, and thus this movement of the bearing 15 causes this bearing and the hub 13 of H to move forward in the same direction, and this hub Armature 10 supported on top
is also moved forward in the same direction, and this armature and rotor 4
The gap g between them is narrowed. Furthermore, if the nut 19 is loosened and the restoring force of the book spring is greater than the fitting friction force of the bearing 15 against the central shaft 3, the bearing 15 will be pushed to the left by the elastic force of the disk spring, and the hub 13 will also be pushed to the left. As the armature 10 moves in the same direction, the armature 10 retreats and the gap 9 becomes larger.

In other words, by rotating the nut 19, the gap Q can be adjusted to any desired gap length.

Note that when the nut 19 is loosened, the elastic force of the spring 17 is insufficient to cause the bearing 15 to follow the leftward movement of the nut, this is due to machining dimensional errors in parts machining, etc. Gap g when electromagnetic clutch assembly is completed
Regarding the adjustment of 5-, design the clutch assembled dimensions of the gap in advance to be large, and adjust it appropriately by tightening only one nut, that is, by tightening only in the direction of narrowing the gap length. Just do it.

Conventionally, in the case of this type of electromagnetic clutch, gap adjustment is generally performed by inserting a plurality of ring-shaped liners between the distance collar 18 and the rotor 4, or in addition to this liner, one nut and washer 20 of this embodiment are used. A plurality of liners of the same shape are also inserted between the retaining ring and the bearing 15, and the adjustment of the gap during the assembly process of the electromagnetic clutch and when the friction surface is worn is done by increasing or decreasing the number of these liners. However, when it comes to replacing or adding/reducing the liner, it is difficult to maintain the proper dimensions all at once, and the liner must be inserted and removed many times, which is extremely troublesome and requires an excessive amount of man-hours. However, there were inconveniences such as the need to prepare a large number of liners of different thicknesses at the same time. On the other hand, in the present invention, the gap is minutely changed by simply rotating the nut 19, so the adjustment work is extremely easy and can be done accurately. Since axial thrust force is constantly applied to the bearing 15 and rotor 4 by elastic bodies such as It is possible to suppress the looseness of these members caused by
Therefore, there are advantages in that it is possible to prevent key fatigue and abnormal wear between the bearing and the center shaft due to the knocking phenomenon between parts, which has conventionally been a problem where load fluctuations are large.

In the embodiment, an electromagnetic clutch has been described, but it is clear that the present invention can be applied to an electromagnetic brake.

[Brief explanation of the drawing]

The drawing shows an embodiment of the present invention, and is a front view with the upper half sectioned. 3... Central shaft, 4... Rotor, 10... Armadure. 13.15...Supporting member, 17...Elastic body. 19...screw mechanism.

Claims (1)

[Claims] A support member that indirectly supports the armature and a gap between the armature and the support member that opposes it! An elastic body is interposed between the rotor and the rotor having one magnetic pole, and a screw mechanism for pressing the elastic body against the rotor through the support member is provided on the central axis that supports the support member. Air gap adjustment device for electromagnetic clutches and brakes.