JPS647039Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake stroke adjustment device used in a mechanical press.

Brakes used in mechanical presses, especially dry brakes, suffer from a lot of lining wear, and in order to maintain brake performance, it is necessary to periodically adjust the stroke according to the amount of wear. As shown in FIG. 1, the conventional brake has a structure in which a brake disc 3 covered with a lining 2, which rotates together with a rotating shaft 1 of a press, is biased toward the housing 4 by a housing 4 and a spring 5. Apply the brake by sandwiching it between the plate 6 and the piston 7.
The push plate 6 is pushed back against the biasing force of the spring 5 via the push pin 8, stopper plate 9, and adjustment nut 10, thereby loosening the disc 3 and releasing the brake. If the lining 2 is worn and needs to be adjusted, loosen the end plate 11 and turn the large diameter adjustment nut 10.
Since the end plate 11 must be fitted into the notches 10a provided at regular intervals on the circumference of the end plate 11 for positioning, it is not possible to perform optimal stroke adjustment. For this purpose, a shim was inserted between the stopper plate 9 and the adjustment nut 10, but when the adjustment nut 1
Since 0 has a large diameter, the shim is also large and requires a lot of man-hours to manufacture, and it has many disadvantages such as turning and removing the large diameter adjustment nut 10 is complicated and requires a lot of time to adjust the stroke. Ta.

The purpose of the present invention is to eliminate these drawbacks and provide a brake stroke adjustment device that is simple and compact in structure, and allows for easy stroke adjustment, even fine adjustments, so there is no need to prepare shims or the like. .

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, a rotary shaft 1 is rotatably provided in a press body 12, and a brake hub 13 is fixed to one end of the rotary shaft 1. As shown in FIG. brake hub 1
A brake disk 3 having internal teeth that mesh with the external teeth of the brake hub 13 is provided so as to be slightly movable in the axial direction of the brake hub 13. Linings 2 are fixed to both surfaces of the brake disc 3. The lining 2 on one side of the brake disc 3 faces the housing 4, and the lining 2 on the other side has external teeth that mesh with the internal teeth of the housing 4, and is biased toward the housing 4 by a spring 5. It faces the push plate 6. An annular piston 7 is fitted into the housing 4 so as to be slidable in the axial direction of the rotating shaft 1. A required number of push pins 8 are screwed onto the push plate 6 on the same circumference, one end of which passes through the housing 4 and comes into contact with the surface of the piston 7 on the side opposite to the cylinder chamber side. At the end of the push pin 8 that is screwed into the push plate 6, there is a cap 1 that is rotatably fitted to the push plate 6 concentrically with the push pin 8 and engaged with the end of the push pin 8.
4 is provided, and a bolt 15 is screwed into the push pin 8.
It is tightened and fixed. With the push plate 6 biased by the spring 5 sandwiching the brake disc 3 between it and the housing 4, the piston 7, which is in contact with the push pin 8 screwed into the push plate 6, is in contact with the housing 4. There is an interval equal to the stroke S of the piston 7 between them. Further, in this state, the piston 7 has a slight gap with the bottom of the cylinder chamber.

3 and 4 show details of the engaging portion and tightening portion between the push pin 8 screwed onto the push plate 6 and the cap 14. A counterbore-shaped step 16 into which the circular protrusion of the cap 14 fits is provided on each side (outer surface) of the push plate 6 opposite to the disk 3, and a push pin 8 is provided at the center of the step 16. A screw hole into which one end of the push plate 6 is screwed is provided so as to penetrate to the inner surface of the push plate 6. An engaging portion is provided between the threaded end of the push pin 8 and the cap 14 to restrain rotation thereof.
That is, a small diameter portion is provided at the threaded end of the push pin 8,
This is cut off from both sides in the diametrical direction to give an oval cross section, and a hole is provided in the center of the circular protrusion of the cap 14 into which the small diameter portion of the oval cross section is fitted. The depth to the stepped portion 17 of the cap 14 and the height of the engaging portion of the push pin 8 are approximately equal, and the cap 14 is normally separated by a distance a from the bolt 1.
5 is tightened and fixed to the surface of the push plate 6.
In this state, the push pin 8 has a protrusion amount l from the push plate 6, and the piston 7 has a stroke S. The outer periphery of the cap 14 is formed into a hexagonal shape so that it can be easily engaged with a tool.

Next, we will discuss the effect. 2 and 3, when compressed air is supplied to the cylinder chamber of the piston 7 from the supply/discharge port 18, the piston 7 pushes back the push plate 6 via the push pin 8 overcoming the biasing force of the spring 5. At this time, a gap equal to the stroke S of the piston 7 is created between the push plate 6 and the lining 2 of the brake disc 3, the brake is released, and the rotating shaft 1 becomes rotatable. When the compressed air is exhausted from the supply/discharge port 18, the piston 7 is pushed back via the push pin 8 by the biasing force of the spring 5, and at the same time, the brake disc 3 and the lining 2 are sandwiched between the housing 4 and the push plate 6. It is found, the brake is applied, and the rotating shaft 1 is fixed. Lining 2
When the piston 7, which is pressed by the spring 5 via the push pin 8, reaches the bottom of the cylinder chamber, a gap is created between the push plate 6 and the lining 2, and the brake becomes ineffective. That is, the stroke S of the piston 7 is increasing. Therefore,
Brake stroke adjustment is required.

For adjustment, compressed air is first supplied from the supply/discharge port 18. Next, loosen the bolt 15, and place a tool on the cap 14 and turn it to the left so as to reduce the protrusion amount l of the push pin 8. The push pin 8 is rotated to the left via the engaging portion and screwed into the push plate 6, and the protrusion amount l becomes smaller. At the same time, the distance a of the engaging portion is also reduced, and the stroke S of the piston 7 can be adjusted to an appropriate amount. The adjustment work is completed by tightening the bolt 15.

As is clear from the above explanation, according to the present invention, fine adjustments to the brake stroke can be made by simply rotating the cap, making it extremely easy. There is no need for shims, and the practical effects and advantages are extremely large, such as saving a lot of man-hours and improving the operating rate of the press.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional example, FIG. 2 is a longitudinal cross-sectional view of a brake equipped with an embodiment, FIG. 3 is a detailed view of the main part, and FIG. 4 is a cross-sectional view taken from FIG. 3. 1 is a rotating shaft, 2 is a lining, 3 is a brake disc, 4 is a housing, 5 is a spring, 6
is a push plate, 7 is a piston, 8 is a push pin, 9 is a stopper plate, 10 is an adjustment nut, 10a is a notch, 11 is an end plate, 12 is a body, 13 is a brake hub, 14 is a cap, 15 is a bolt ,
16 is a stepped portion, 17 is a stepped portion, and 18 is a supply/discharge port.

Claims (1)

[Scope of Claim for Utility Model Registration] A brake disc 3 of a rotating shaft of a press is sandwiched between a housing 4 and a push plate 6 provided on a frame,
In a press brake stroke adjustment device that applies a brake by urging a push plate 6 toward the housing 4 and releases the brake by pushing back a push pin 8 set upright from the push plate 6 toward the housing 4, the push plate A circular counterbore-shaped stepped portion 1 provided on the outer surface of 6
6, and a pusher whose one end is screwed into a screw hole passing through the center of the stepped portion 16 to the inner surface of the pusher plate 6, and the small diameter portion provided at the screwed end is an engaging portion that restrains its rotation. The pin 8, a circular protrusion that fits into the stepped portion 16 of the push plate 6 and whose height is smaller than the depth of the stepped portion 16, and the engaging portion of the push pin 8 provided on this circular protruded portion are fitted. let me,
A cap 14 having an engaging portion having the same height and depth as the engaging portion, and a screw hole in the end face of the push pin 8 passing through the center hole of the cap 14 and tightening the cap 14 to the push plate 16. A brake stroke adjustment device comprising: a bolt 15;