JPS61192934A - Automatic clearance adjusting device of electromagnetic clutch/brake - Google Patents

Abstract

PURPOSE:To make it easy to make a clearance, and prevent that abrasion- powder is caught between the flange part and the projecting engagingly-stopping- part of an armature, by forming a notched part which opens from the recessed part of the armature to the outside. CONSTITUTION:A notched part 20 is formed at the outer circumference of an armature 4, as this notched part 20 opens from the recessed part 4a of the armature 4 to the outside. Consequently, as the head of an engagingly-stopping- member 7, especially the recessed part 4a which faces to the flange part 10, opens to the outside through the notched part 20, it becomes possible to see the clearance g2 from the outer circumferential part of the armature 4, through said opening, and it also becomes possible to measure this clearance g2 with a thickness gauge from the outside through the notched part 20.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic adjustment device for a gap between an armature of a friction transmission type electromagnetic clutch or brake and a transmission friction surface facing the armature, and particularly relates to This invention relates to a device for making it easier to confirm the dimensions of a gap, and for ensuring that the required gap length is maintained more reliably.

[Conventional technology]

First, conventional electromagnetic clutches and brakes of this kind will be explained. Since there is almost no difference in structure between an electromagnetic clutch and a brake, the case of an electromagnetic brake will be explained with reference to FIGS. 3 to 5. In FIG. 3, reference numeral 1 denotes a yoke having an annular recess opening on one side, and each opening end serves as a magnetic pole. Reference numeral 2 denotes a coil housed in a recess in the yoke 1, which together with the yoke 1 constitutes an electromagnet section.When using the brake, this electromagnet section is fixed at a suitable position on the equipment (not shown) in the yoke section, and rotates. It is designed not to. 3 is a friction plate provided over the magnetic pole part of the yoke to close the opening of the yoke 1; 4 is a friction plate provided on one side of the yoke 1 over the magnetic pole part of the yoke 1 and the friction plate 3; Annular plate 5 with armatures facing each other with h apart
It is fixed with rivets 6 at three locations equally distributed on the circumference. The plate spring 5 is fixed to the inner surface of the sliding member 8 at the three locations intermediate between the rivets 6 by each headed locking member 7 which also serves as a bolt. The head of the locking member 7 faces into the recess 4a of the armature 4, and a portion of the head serves as a flange 9, and the inner surface of the 7-lung portion faces into the recess 4a of the armature 4. On the side surface of the protruding locking part 10, there is a gap equal to the above-mentioned space 111g1.
They are facing each other with z in between.

The sliding member 8 has a spline 1 attached to the hub 11 at the inner peripheral portion.
2. Reference numeral 13 denotes a connecting member such as a spring bin, which is press-fitted across a hole provided in the axial direction of the sliding member 8 and the hub 11, and is firmly connected to the sliding member 8 so that it cannot move relative to the sliding member 8. However, with respect to the hub 11, it is possible to slide in the axial direction within the hole under conditions described later. Note that a plurality of connecting members 13 are provided at equal intervals on the same circumference. 14 is a braked shaft to which the hub 11 is fitted.

A conventional electromagnetic brake is configured as described above, and when no current is supplied to the coil 2, the armature 4 is separated from the magnetic pole part, and the braking force on the braked shaft 14 is released, but current is supplied to the coil 2. A magnetic flux is generated that exits from one magnetic pole, passes through the air gap g1, bypasses the armature 4, passes through the air 891 again, and returns to the other magnetic pole.The armature 4 receives an electromagnetic attraction force, and the armature release plate It is attracted toward the magnetic pole part against the force of spring 50, and the magnetic pole part and the friction plate 3 are brought into pressure contact, and braking is applied to the armature 4, so that the plate spring 5 and the sliding force are applied to this armature. Braking is applied to the braked shaft 14 which is mechanically connected via the member 8 and the hub 11.

Then, due to wear of the friction surface (braking surface), it becomes empty! If Iy1 increases, empty [1 and 1! Since if2 is set equal, when the protruding locking portion 10 of the armature hits the seventh rung portion 9 of the locking member 7 during the suction process of the armature 4, there is a gap between the armature 4 and the friction surface facing it. , a gap corresponding to the amount of wear on the friction surface will exist, but so that the electromagnetic attraction force against the armature at this time exceeds the contact friction force against the hole of the connecting member 13 press-fitted into the hole of the hub 11, Since the frictional force, and thus the holding force of the hub 11 against the connecting member 13, is set, the sliding member 8, together with the connecting member 13, is forcibly moved to follow the armature 4 during the suction process of the armature, which continues to be sucked. Therefore, the connecting member 13 is pulled out from the press-fit hole of the hub 11 by an amount corresponding to the wear of the friction surface, and since the return movement amount of the armature 4 when the brake is released is always constant and equal to the empty Wf1. In the end, the gap was adjusted to the original gap length.

FIG. 4 shows another conventional example of a gap adjustment device, in which an axial guide hole 16 is provided in a hub 15 fixed to a braked shaft 14, and a sliding member 17 is inserted into this guide hole. A locking member 7, which is the same as the locking member 7 shown in FIG. 18 is fitted, and this friction member cannot prevent the movement of the sliding member 17 due to the electromagnetic attraction force when the coil 2 is excited, but it does prevent the movement of the sliding member 17 due to the elastic force of the leaf spring 5. The frictional resistance obtained is applied between the inner circumferential surface of the guide hole 16 and the sliding member 17.

When the space 11111'l increases due to wear between the armature 5 and its friction plate 3, the movement of the armature 5 due to electromagnetic attraction is used to move the sliding member 17 from within the guide hole 16 to the transmission friction surface. Empty by pulling out only the amount of wear
It is now possible to adjust g1.

[Problems with conventional technology]

By the way, in the above, at the beginning of operation, the gap length of the gap gl is set to a predetermined dimension, and at the same time the gap length of the gap g2 between the seventh rung part 9 of the Sun Tzu member 7 and the protruding locking part 10 is set to the above-mentioned gap l! It is necessary to match the pore length of Ig1.

In setting the dimensions of the gap vf2, the following measures are taken because this part is inside and cannot be seen from the outside, and direct use of a thickness gauge or the like is not possible.

That is, in the assembled state, the gap agt is larger than the desired predetermined gap length, and the gap f2 is the gap [
The machining dimensions of each related part are set in advance so that the dimensions are smaller than the gap length of 'x, and by this, the gap f
In the case where the relationship between rmf1 and rmf2 is set to the above relationship, current is temporarily supplied to the coil 3, and the armature 4
is once sucked and then released, the sliding member 8 is moved against the hub 11 (in FIG. 4, the sliding member 17 is 15)) will be pulled out to the left (in FIGS. 3 and 4) by the size difference between the gap gl and the gap f2, so when the armature 4 is released, the air I! 1g1 and the interval '812 have the same dimensions.

In this state, the thickness gauge etc. indicates that it is empty @f1.
By measuring, the dimension of the gap 111g2 can be known, albeit indirectly, so based on the measurement of this gap 11g1, the dimension of the gap @g2 should be the same as the desired set gap length of the gap 11g1. As shown in FIG. 3 and 4) until the gap g1 becomes slightly larger than the desired internal dimension, and then temporarily supplies current to the coil 3 again to attract and release the armature 4. If this is performed, the gap length of the gap @91 will match the dimension of the gap 11g2 due to the above-mentioned gap automatic adjustment effect, and the gap length of the gap f1 will be set to the desired predetermined dimension.

Therefore, in the case of the conventional electromagnetic brake, setting the empty space [1] is extremely troublesome and requires a large amount of man-hours. Abrasion powder generated on the braking friction surface enters, and this abrasion powder gets caught between the 7 rung part 9 and the protruding locking part 10 of the armature, narrowing the gap @f2.
The dimensions of lIgl were narrowed and the initial armature suction,
A situation may arise in which the release characteristics are not maintained.

The above has been described for electromagnetic brakes, but in the case of an electromagnetic clutch, the only difference from the brake is that one of the yoke 1 side or the braked shaft 14 is connected to the drive side, and the other is connected to the driven side. Both physically and functionally, it is basically the same as the brake, and the above-mentioned problems still exist.

[Means for solving problems]

This invention solves the above-mentioned problems and will be explained below with reference to FIGS. 1 and 2.

This figure is a sectional view and a side view showing only the main parts, and the difference from the conventional device shown in FIGS. 3 to 5 is the armature 4.
A notch 20 is provided on the outer periphery of the armature to allow the armature to pass through the recess 4a to the outside.

Although only one notch 20 is shown in the drawing, it is provided in each recess facing the head of each engaging member 7.

[Effect]

As a result of providing such a notch 20, the recess 4a facing the head of the locking member 7, especially its 7 rungs 10, opens outward through the notch 20. It becomes possible to visually see the part between *yz and the part between *yz and the part @f
The dimensions of 2 can be measured directly from the outside with a thickness gauge.

〔Effect of the invention〕

According to this invention, the dimension of the gap @f2 can be directly measured from the outside, so the excitation by the coil and the measurement of the air 11fl are repeated as in the above-mentioned conventional method.
The work of setting the air vayxz and the gap g2 is significantly simplified without having to use a method of knowing g2, and the number of man-hours for adjustment work can be greatly reduced. The powder is discharged to the outside through the notch 20 due to the action of high-pressure airflow generated during armature suction or the action of centrifugal force during operation, and the wear powder is removed from the recess 4a.
There is no accumulation inside the armature, and the initial set dimension of the gap @92 is permanently secured, so the air space Rf1 between the braking or transmission friction surfaces is kept constant, and stable armature suction and release characteristics are achieved. can get.

In the above description, the present invention is applied to a clutch in which the coil side rotates, but it is also possible to interpose a rotor between the coil side and the armature,
Torque can be transferred between the rotor and armature.
Even if it is implemented in a so-called stationary coil type, the effects are the same as in the above case.

[Brief explanation of drawings]

Figures 1 and 2 are sectional views and side views of essential parts of the device of the present invention, and Figures 3, 4, and 5 are conventional devices, respectively, and Figure 3 is a longitudinal section. 4 are longitudinal cross-sectional views showing another example, and FIG. 5 is a cross-sectional view of only the main parts.

Claims (1)

[Claims] An armature supported by a leaf spring on a sliding member held by a hub so as to be slidable in the axial direction, and a head flange portion facing a recess provided in the armature by opening toward one side. and a headed locking member connected to the sliding member, and when the armature is suctioned, the sliding member is pulled out in the axial direction with respect to the hub by an amount corresponding to the amount of wear on the transmission or braking friction surface. An electromagnetic clutch/brake that adjusts the gap between transmission or braking friction surfaces is characterized in that the outer periphery of the armature is provided with a notch that extends from the recess to the outer periphery of the armature. Automatic air gap adjustment device.