JPH025132Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disc-type electromagnetic brake that performs braking by clamping both sides of a disc fixed to a rotating shaft with linings.

As an example of a conventional disk-type electromagnetic brake, the one shown in FIGS.
The vertical shaft 4 stands upright from the brake stand 12,
A pair of actuating rods 7, 7, to which the main body of the electromagnet 10 and the plunger rod 11 are attached, are supported by vertical shafts 9, 9 which are also supported on the brake stand. The roller 6 of the eccentric roller shaft 8 was brought into contact with the stroke adjustment bolts 5, 5 of the arms 3, 3. In the figure, 13 is a brake spring, and 14 is an arm release spring.

Originally, the diameter of the disk was larger than that of the drum, so it was necessary to make the brake dimension L _B (shown in the second diagram) as small as possible and to reduce the L dimension.However, according to the above conventional configuration, the left and right arms 3,
Since the vertical shafts 4, 4, which serve as the fulcrum of the brake, are located between the disk 1 and the electromagnet 10, the brake dimension L _B is necessarily large, and the L dimension is large, resulting in a large structure. In addition, control torque adjustment and stroke adjustment are performed using a pair of stroke adjustment bolts 5, 5.
This required delicate adjustments and was troublesome. Furthermore, there were other drawbacks such as difficulty in manually loosening.

Therefore, the purpose of this invention is to eliminate the drawbacks of the above-mentioned conventional technology, and in particular to reduce the brake dimension L _B and make it compact.
To provide an improved disc-type electromagnetic brake which has a lightweight structure, allows easy various adjustments, and allows stable and reliable braking and releasing operations.

Next, this invention will be explained with reference to embodiments shown in FIGS. 3 to 5.

A pair of flat plate-shaped arms 23, 23' face each other substantially in parallel, and block-shaped bearings 23a, 23a protruding from the inside of each lower end edge are connected to the disk 21 and the flat plate-shaped brake stand 20. They are rotatably connected by one horizontal fulcrum pin 24 parallel to the . The support pin 24 is supported by support plates 20a and 20b on the brake stand 20. Each arm 2
Linings 22, 22 are attached to the opposing inner surfaces of the disks 3, 23' with the disks 21 sandwiched therebetween, and the linings 22, 22 come into contact with and separate from the disk 21.

An electromagnet 26 is installed on the outer surface of one arm 23', and the plunger rod 27 attached to the suction plate 28 is located approximately at the center of the other arm 23 and has a common center line with the plunger rod 27. Stroke adjustment bolt 25 installed in
I am brought into contact with this. Stroke adjustment bolt 25
The stroke can be adjusted by adjusting the amount of movement in and out using two lock nuts 29 and 29' that abut on the inner and outer surfaces of the arm 23. In the figure, 30 is a suction plate return spring wound around the plunger rod 27.

In the figure, reference numeral 31 denotes a torque adjustment mechanism installed between the pair of arms 23 and 23', more specifically, at a position near the end opposite to the lining 22. Therefore, the plunger rod 27 and the stroke adjustment bolt 25 are arranged in the pair of arms 23, 23'.
It is located between the lining 22 and the torque adjustment mechanism. The torque adjustment mechanism 31 has one arm 2
The base end of a torque adjustment bolt 34 is rotatably connected with a pin 35 to a bearing 33 protruding from the inner surface of the arm 3'.
3 is passed through, a brake spring 36 is wound around this, and the other end of the brake spring 36 is supported by a washer 37 and an adjustment nut 38. Therefore, the adjustment nut 38
A pair of arms 23, 2 are tightened and loosened by
The strength with which the linings 22, 22 to which the linings 3' are attached can clamp the disc 21, that is, the braking torque generated thereby, can be adjusted.

In the figure, reference numeral 40 denotes a clearance adjustment bolt screwed into the side frame 20a' of the support plate 20a, the tip of which is brought into contact with the outer surface of one arm 23' to define the position of the arm 23'.

In the figure, 41 is a manual loosening bolt screwed into the other arm 23.

Next, the operation will be explained with reference to FIG.

FIG. 6A shows a state in which the excitation current of the electromagnet 26 is cut off and braking is applied. When the excitation current is cut off, the arms 23 and 23' move toward each other using the fulcrum pin 24 as a fulcrum by the action of the braking spring 36. Therefore, the lining 22 fixed to the arms 23, 23' presses the disc 21 to generate braking force.

When releasing the brake, an exciting current is passed through the electromagnet 26, and the electromagnet 26 is excited and attracts the attraction plate 28. At this time, the tip of the plunger rod 27 of the suction plate 28 is in contact with the adjustment bolt 25, so the adjustment bolt 25 is pushed and the arm 2
3' and the suction plate 28 overcome the force of the brake spring 36, and as shown in FIG. 6B, the arms 23 and 23' separate from each other and open, and the lining 22 separates from the disc 21, releasing the brake. When releasing the brake, since the plunger rod 27 and stroke adjustment bolt 25 are installed at an intermediate location between the lining 22 and the torque adjustment mechanism 31, the brake can be released without being affected by the deflection of the arms 23, 23'.
The brake can be released reliably.

Since this invention is based on the disc type electromagnetic brake having the above configuration, it has the following effects.

To adjust or change the braking torque, use the adjustment nut 38.
It can be easily performed using only a chisel. Brake spring 36
The length can be checked visually. Stroke adjustment and changes of the plunger rod can be easily made by operating a single stroke adjustment bolt. Manual loosening can be easily done by operating a single manual loosening bolt, and it is easy to see. brake dimensions
Since L _B can be reduced, it can be configured to be small and lightweight.
Since the arm is opened directly by the plunger rod, there is little mechanical loss. Therefore, the stroke of the plunger rod can be made as small as possible, and the electromagnet can be made smaller.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and a front view of a conventional disc-type electromagnetic brake, and Figures 3, 4, and 5 show a conventional disk type electromagnetic brake.
The figures are a plan view and a front view showing a disk-type electromagnetic brake which is an embodiment of the invention, and FIG. 6 is an explanatory diagram of the operation of the invention, in which A shows the operating state and B shows the open state. 23, 23'...Arm, 21...Disk,
20...brake stand, 24...fulcrum pin, 22...
... Lining, 26 ... Electromagnet, 27 ... Plunger rod, 25 ... Stroke adjustment bolt, 3
6...Brake spring, 31...Torque adjustment mechanism, 40
...Gap adjustment bolt.

Claims (1)

[Scope of utility model registration request] A pair of arms 2 that are rotatably connected at one end by a common fulcrum pin 24, have a lining 22 on opposing surfaces at the other end, and sandwich the disk 21 from both sides.
3, 23', which is pivotally supported by one arm 23' and protrudes from the outside of the other arm 23, and is loaded with a braking spring 36 to apply a force in the direction of moving the arms 23 and 23' toward each other. A torque adjustment mechanism 31 and a suction plate 28 provided integrally on the outside of the one arm 23'.
an electromagnet 26 having an electromagnet 26, an adjustment bolt 25 provided approximately at the center of the other arm 23 and passing through the arm 23; bolt 2
5 and a plunger rod 27 in contact with the disk type electromagnetic brake.