JPH0741079U - Negative disc brake - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a negative type disc brake with a simple structure and easy adjustment of the gap between the pad and the rotor. [Structure] At one end of the same side as the rod 7, etc. of one of the two arms 3a and 3b, one end of which is pivotally attached to a fixed part, and the other end of which has a rod 7 for exerting an elastic force to bring both arms closer to each other, and a braking spring 10. The cylinder body 23 to which pressure oil is supplied and discharged is attached to one arm 3a so as to face the other arm 3b. The piston 26 is fitted into the cylinder body 23. An adjusting bolt 27 inserted into the cylinder body 23 is screwed onto the other arm 3b, and a lock nut 28 for fixing the protruding length from the arm 3b is screwed onto the adjusting bolt 27. The piston 26 is hollow with a bottom, and the rounded end of the adjusting bolt 27 is brought into contact with the bottom of the piston 26.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a negative type disc brake used for industrial machines such as forklifts, cranes, machine tools, monorail carriers, and transport machines.

[0002]

[Prior art]

 The negative type disc brake is a brake that acts so that the brake on the rotor is released when the brake pedal is depressed, and the rotor is braked when the brake pedal is released.

Next, one example of the structure of a negative type disc brake (this will be simply referred to as a brake in the following description) will be described with reference to FIG. 4 showing a brake disclosed in Japanese Patent Laid-Open No. 4-231731.

A right end portion (right and left, up and down according to FIG. 4) of arms 3 a and 3 b sandwiching the rotor 2 is pivotally attached to a support 1 fixed to a vehicle body by a shaft 4. Pads 5a and 5b are connected to the arms 3a and 3b with bolts, and the linings are opposed to the side surfaces of the rotor 2. Holes 6a and 6b are formed at the right end portions of both arms 3a and 3b, and rods 7 formed with screws at both ends are 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 coming out of the arm 3a, and a braking spring 10 is fitted to the upper end of the rod 7 and a nut 11 is used. The compression strength is adjusted, and the lock nut 12 fixes this. Further, adjusting bolts 13a and 13b are screwed onto the right end portions of the arms 3a and 3b so that the projecting length can be adjusted by lock nuts 33a and 33b. Pins 15a and 15b protruding from the cam piece 14 are opposed to the tips of the adjusting bolts 13a and 13b, and a lever 16 connected to the cam piece 14 is driven left and right by a push rod 17 to move the cam piece 14 to a shaft 18. By rotating counterclockwise about the center, the arms 3a, 3b are pushed open via the pins 15a, 15b and the adjusting bolts 13a, 13b. The push rod 17 is moved rightward together with the piston 20 by sending pressure oil to the cylinder 19 supported by the arm 3a. Reference numeral 21 is a spring that keeps the piston 20 moving to the right even when pressure oil is not sent. This elastic force acts to open the arms 3a and 3b, and the braking spring 10 tries to close the arms 3a and 3b. It is weaker than the action. The spring 21 serves to prevent the cam piece 14, the lever 16 and the like from rattling by lightly elastically contacting the piston 20, the pins 15a and 15b with the adjusting bolts 13a and 13b.

With such a configuration, when pressure oil is not supplied to the cylinder 19, the arms 3a and 3b are attracted to each other via the rod 7 due to the braking spring 10 and the pads 5a and 5b. The lining is pressed against the side surface of the rotor 2 for 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 cam piece 14 rotates counterclockwise via the push rod 17 and the lever 16, and the pins 15a and 15b are rotated. Then, the adjusting bolts 13a and 13b are pushed to open the arms 3a and 3b, and the pads 5a and 5b are separated from the rotor 2 to release the braking.

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

[0008]

[Problems to be solved by the device]

 In the conventional brake configured as described above, the adjustment of the clearance between the pad lining and the rotor side surface requires adjusting the adjusting bolts 13a and 13b at two positions, and although the explanation is omitted, Since the connecting length adjusting part is also present at the connecting part between the rod 17 and the lever 16, the initial adjustment when installing the brake and the adjustment due to the wear of the lining are troublesome, and the brake should be installed in a narrow space. Also required skill to work.

[0009]

[Means for Solving the Problems]

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

[0010]

[Action]

 The adjusting bolt pushed out by the pressure oil from the cylinder attached to one arm opens the space between the arms 3a and 3b by the piston, and adjusts the protruding length from the arm to which this is screwed to the piston. Is easy. That is, the degree to which both arms are pushed open can be adjusted by twisting the adjustment bolt. When the adjustment is completed, the opening angle of both arms can be made constant by fixing the adjusting bolt to the arm with the lock nut. This adjustment work is easy because you only have to operate the adjustment bolt and lock nut in one place.

[0011]

【Example】

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

At the other end of the arms 3a and 3b, one end of which is pivotally attached to the support 1 by a shaft 4, a rod 7 (in this embodiment, an equivalent bolt is used. The nut 8 and the lock nut 9 are not required.), And the braking spring 10 is pressed against the arm 3b with the nut 11 and the lock nut 12 to apply the braking force to the arms 3a and 3b. This is similar to the conventional example.

In the present invention, the hydraulic cylinder 22 and the 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 is attached to the arm 3a by inserting the small diameter portion 23a having a screw formed at the left end (left and right according to FIG. 3) into the arm 3a and tightening the nut 24. A piston 26 is fitted in 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 therein. The lower end of the adjusting bolt 27 has a rounded shape such as a spherical surface, and is brought into contact with the bottom of the piston 26 so as to be able to change a small direction. The adjusting bolt 27 is screwed onto the upper arm 3b, and the mounting length can be adjusted by twisting this, and this length is fixed by the lock nut 28. Reference numeral 29 is a piston cup, 30 is a dust boot for dust-proofing the space between the piston and the cylinder body, and 31 is a bleeder screw used when air is removed from the cylinder body 23. Pressure oil is supplied to and discharged from the cylinder body 23 through an oil passage 32 provided in the small diameter portion 23a.

With the above configuration, when pressure oil is not applied to the oil passage 32, the arms 3 a and 3 b are attracted by the braking spring 10 and the lining of the pads 5 a and 5 b is rotated by the rotor ( 1 to 3 (not shown in the drawings) is pressed to perform braking.

When releasing the braking, the brake pedal is depressed to supply the pressure oil to the oil passage 32. As a result, the piston 26 is pushed rightward in FIG. 3, and the arm 3b is pushed through the adjusting bolt 27. That is, since the arms 3a and 3b are spread by the cylinder body 23 and the adjusting bolt 27, the linings of the pads 5a and 5b are separated from the rotor and the braking is released. At this time, the center lines of the piston 26 and the adjusting bolt 27 are slightly different from each other, but the adjusting bolt 27 abuts the piston at the rounded end portion. Will not be added.

In order to adjust the clearance between the rotor side surface and the lining when the brake is first assembled or the pad lining is worn, the lock nut 28 is loosened and the adjusting bolt 27 is twisted so that the protrusion length from the arm 3b is increased. Is adjusted, and the lock nut 28 is tightened after the adjustment. That is, the gap can be adjusted only by twisting the lock nut 28 and the adjusting bolt 27, so that the operation is easy.

[0018]

[Effect of device]

 (1) The mechanism is simple because the hydraulic cylinder installed between the two arms 3a and 3b and the adjustment bolt are used to release the control. The adjustment bolts 13a and 13b, the cam piece 14, the pins 15a and 15b, and the push rod 17 which are required in the related art are unnecessary.

(2) The pad lining and the gap between the rotor side surface and the rotor side surface can be adjusted by only operating the adjusting bolt 27 and the lock nut 28 at one place, so that it can be easily performed and does not require a large degree of skill in the work. .

[Brief description of drawings]

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

FIG. 2 is a front view of the above.

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

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

[Explanation of symbols]

 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 Small Diameter Part 24 Nut 26 Piston 27 Adjusting Bolt 28 Lock Nut 29 Piston Cup 30 Dust Boot 31 Breather Screw 32 Oil Passage 33a, 33b Lock Nut

Claims (1)

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