JP2584656Y2 - Negative disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial applications] This invention is applicable to industrial machines such as forklifts, cranes, machine tools, monorail carriers, etc.
The present invention relates to a negative type disc brake used for a transport machine.

[0002]

2. Description of the Related Art In a negative type disc brake, when a brake pedal is depressed, braking on a rotor is released.
The brake acts to brake the rotor when the brake pedal is released.

[0003] Next, one of the configurations of a negative type disc brake (hereinafter, simply referred to as a brake) will be described.
An example will be described with reference to FIG. 4 showing a brake described in Japanese Patent Application Laid-Open No. Hei 4-231731.

A support 1 fixed to a vehicle body is provided with a rotor 2
The right ends (left and right, up and down according to FIG. 4) of the arms 3 a and 3 b sandwiching are pivotally connected by a shaft 4. Pads 5a and 5b are connected to the arms 3a and 3b by bolts, and the linings thereof are opposed to the side surfaces of the rotor 2. Both arms 3a, 3b
Holes 6a and 6b are formed at the right end of, and a rod 7 having threads formed at both ends is inserted. A nut 8 and a lock nut 9 are fixed to the lower end of the rod 7 to prevent the rod 7 from falling out of the arm 3a. A braking spring 10 is fitted to the upper end of the rod 7 and the nut 11 The compressive strength is adjusted, and this is fixed with the lock nut 12. Adjustment bolts 1 are provided at the right ends of the arms 3a and 3b.
3a and 13b are screwed together with locknuts 33a and 33b so that the protrusion length is adjustable. Adjustment bolt 13
a, a pin 15 protruding from the cam piece 14
a, 15b are opposed to each other, and the lever 1 is connected to the cam piece 14.
The arm 3a, 3b is pushed and opened via the pins 15a, 15b and the adjustment bolts 13a, 13b by rotating the cam piece 14 counterclockwise about the shaft 18 by driving the cam piece 6 left and right by the push rod 17. Like that. The push rod 17 is moved rightward together with the piston 20 by sending pressure oil to a cylinder 19 supported by the arm 3a. 21 is a piston 20 even when pressure oil is not supplied.
Is moved to the right, and this elastic force is applied to the arms 3a and 3b.
The effect of opening the brake is that the brake spring 10
b is weaker than the action of closing b. Spring 21
Adjusts the piston 20, the pins 15a and 15b with the adjusting bolt 1
3a and 13b, lightly elastically contact the cam piece 14, the lever 1
6 acts so as not to rattle.

[0005] With this configuration, the cylinder 19
When the pressure oil is not supplied to the arm 3, the arms 3a and 3b are attracted to each other via the rod 7 because of the brake spring 10, and the lining of the pads 5a and 5b is pressed against the side surface of the rotor 2 to perform braking.

When the brake pedal is depressed and pressure oil is supplied to the cylinder 19 to move the piston 20 to the right, the push rod 1
7. The cam piece 14 rotates counterclockwise via the lever 16, and the adjusting bolts 13a, 13 are rotated by the pins 15a, 15b.
b to open the arms 3a and 3b, and
b is released from the rotor 2 to release the braking.

The gap between the linings of the pads 5a and 5b and the side of the rotor is adjusted by adjusting the length of the adjustment bolts 13a and 13b protruding from the arms 3a and 3b.

[0008]

In the conventional brake constructed as described above, the gap between the pad lining and the rotor side must be adjusted by adjusting two positions of the adjusting bolts 13a and 13b. Although the description has been omitted, since the connecting portion of the connecting portion between the push rod 17 and the lever 16 is also provided with an adjusting portion of the connecting length, the initial adjustment at the time of mounting the brake and the adjustment due to the wear of the lining are troublesome, and the brake cannot be used. The work required skill because it was installed in a small space.

[0009]

The present invention is based on a conventional cylinder 19, a push rod 17, and adjusting bolts 13a, 13a.
b, instead of the cam piece 14, a cylinder for pushing and opening the two arms 3a and 3b to release the braking is attached to one arm and provided between both arms, and an adjustment bolt pushed by the piston of the cylinder. Is screwed to the other arm to form a brake.

[0010]

The adjusting bolt pushed out from the cylinder attached to one of the arms by the pressurized oil is pushed by the piston to open the space between the arms 3a and 3b, and has an extension length from the arm to which the screw is screwed to the piston. Easy to adjust.
That is, the degree to which both arms are pushed open can be adjusted by twisting the adjustment bolt. If the adjustment bolt is fixed to the arm by the lock nut after the adjustment is completed, the opening angle of both arms can be made constant.
This adjustment work is simple because only the adjustment bolt and the lock nut need to be operated at one place.

[0011]

1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view, FIG. 2 is a front view of FIG. 1 viewed from below, and FIG.
FIG. 2 is an enlarged side view of the right side of FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

At the other end of the arms 3a, 3b, one end of which is pivotally connected to the support 1 by the shaft 4, a rod 7 (an equivalent bolt is used in this embodiment. Therefore, the prior art shown in FIG. 4). The nut 8 and the lock nut 9 are not required.) The point that the braking spring 10 is pressed against the arm 3b with the nut 11 and the lock nut 12 to apply a braking force to the arms 3a and 3b is different from the above-described conventional example. The same is true.

In the present invention, a hydraulic cylinder 22 and an adjusting bolt 27 are provided between the ends of both arms instead of the cam piece 14, the adjusting bolts 13a and 13b, the push rod 17 and the like of the conventional example.

The hydraulic cylinder 22 is configured as shown in FIG. That is, the cylinder body 23 has a small-diameter portion 23 a formed with a screw at the left end (right and left in FIG.
a, and the nut 24 is attached to the arm 3a by tightening. A piston 26 is fitted to the cylinder body 23. The piston 26 is a hollow body with a bottom having a larger inner diameter than the adjusting bolt 27, and the adjusting bolt 27 is loosely inserted into the hollow body. The adjusting bolt 27 has a rounded shape at its lower end, such as a spherical surface, and is brought into contact with the bottom of the piston 26 so as to freely change its direction. The adjustment bolt 27 is screwed into the upper arm 3b,
By twisting this, the mounting length can be adjusted, and this length is fixed by the lock nut 28. 29 is a piston cup, 30 is a dust boot for preventing dust between the piston and the cylinder body, and 31 is a breather screw used for bleeding air from the cylinder body 23. Pressure oil is supplied and discharged into the cylinder body 23 from an oil passage 32 provided in the small diameter portion 23a.

[0015] With the above configuration, the oil passage 32
When pressure oil is not applied to the arm, the arms 3a and 3b are pulled by the braking spring 10, and the linings of the pads 5a and 5b are pressed against the rotor (not shown in FIGS. 1 to 3). Braking is performed.

When the braking is released, the brake oil is supplied to the oil inlet 32 by depressing the brake pedal. Thereby, the piston 26 is pushed rightward in FIG. 3 and pushes the arm 3 b via the adjustment bolt 27. That is, since the arms 3a and 3b are pushed out by the cylinder body 23 and the adjustment bolt 27, the lining of the pads 5a and 5b is separated from the rotor, and the braking is released. At this time, the center lines of the piston 26 and the adjustment bolt 27 are slightly different from each other.
Since the rounded end comes into contact with the piston at the rounded end, no excessive force is applied to each part of the mechanism due to this difference.

To adjust the gap between the rotor side surface and the lining during the initial assembly of the brake or when the pad lining is worn, loosen the lock nut 28 and adjust the bolt 27.
May be adjusted to adjust the protruding length from the arm 3b. After the adjustment, the lock nut 28 is tightened. That is, the gap can be adjusted only by twisting the lock nut 28 and the adjustment bolt 27, so that the operation is simple.

[0018]

[Effects of the Invention] (1) The brake is released by a hydraulic cylinder and an adjustment bolt mounted between the two arms 3a and 3b, and the mechanism is simple. The conventional adjustment bolts 13a and 13b, the cam piece 14, the pins 15a and 15b, and the push rod 17 are unnecessary.

(2) To adjust the clearance between the pad lining and the rotor side surface, adjust the adjustment bolt 27 and the lock nut 28 by one.
It can be done simply by operating it in several places, so it can be done easily and does not require a great deal of skill.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a negative disc brake according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged side view of the same.

FIG. 4 is a partially cutaway plan view illustrating a conventional disc brake of this type.

[Explanation of symbols]

 Reference Signs List 1 support 2 rotor 3a, 3b arm 4 shaft 5a, 5b pad 6a, 6b hole 7 rod 8 nut 9 lock nut 10 braking spring 11 nut 12 lock nut 13a, 13b adjustment bolt 14 cam piece 15a, 15b pin 16 lever 17 push rod 18 Shaft 19 Cylinder 20 Piston 21 Spring 22 Hydraulic Cylinder 23 Cylinder Body 23a Thin Portion 24 Nut 26 Piston 27 Adjusting Bolt 28 Lock Nut 29 Piston Cup 30 Dust Boot 31 Breather Screw 32 Oil Passage Port 33a, 33b Lock Nut

Claims (1)

(57) [Scope of request for utility model registration] 1. One end of two arms (3a) and (3b) positioned across a rotor is pivotally attached to a fixed portion, and both arms are pulled to the other end of both arms and attached to both arms. In a negative disc brake provided with a rod (7) and a braking spring (10) for making the lining of the pad elastically contact the side surface of the rotor, the rod (7) and the braking spring (1) are provided.
At the end provided with 0), the cylinder body (23) of the hydraulic cylinder that drives the piston (26) by supplying and discharging pressure oil
Is attached to one arm (3a), and an adjustment bolt (27) having an end abutting on the piston (26) is screwed into the other arm (3b) to fix the installation length of the adjustment bolt (27). A negative-type disc brake characterized in that a lock nut (28) is screwed into an adjustment bolt (27).