JPH0314926A - Brake shoe mounting structure for brake disc - Google Patents

Abstract

PURPOSE:To facilitate replacement of a brake shoe or mounting and demounting operations of an anchor block by providing hanging hooks with long holes at both end parts of the anchor block, and providing a means for releasing the engagement of support-pins with the long holes. CONSTITUTION:When a brake shoe is removed from a brake head 11', the brake shoe is lowered together with an anchor block 3 by pulling out both bolts 33 on the lower end part, and support-pins 6 are engaged with the upper ends of long holes 4a to stop hanging hooks 4. The anchor block 3 is then put into a turning movement around the support-pins 6 to release support of the brake shoe by an anchor pin 3a and demount it. Mounting operation is performed in the reverse procedure of removal. When the anchor pin 3a or a bush 3b is replaced, the brake shoe is first removed, the anchor block 3 is lifted, the support-pins 6 are engaged with notches 4b of the hanging hooks 4, and the anchor block 3 is moved in the direction of the arrow to release the engagement of the support-pins 6 with the notches 4b. After that, the anchor pin 3a or the bush 3b is replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake shoe mounting structure for a disc brake mainly used in a railway vehicle.

[Conventional technology]

As disc brakes for railway vehicles, a pair of brake shoes having a back plate with a fixed lining is attached to the brake head, and suspended from the bogie frame, and the brake cylinder and brake lever act to brake the brake shoes. Braking force is obtained by sliding on both sides of the brake disc, or a pair of brake shoes are attached to the front and rear arms of the caliper supported on the bogie frame, and these are slid on both sides of the brake disc. There are some that obtain braking force. An example of the former is disclosed in Japanese Patent Laid-Open No. 147133/1983. The attachment structure of this brake shoe to the brake shoe head will be explained.

In FIGS. 3 and 4, 1l is a brake shoe head, l1a is a dovetail groove or dovetail, each flb is an open end, each 110 is an arcuate recess, and each lid is a screw hole. In addition, 21 is a brake shoe, 2
2 is a lining 23a which is divided and fixed to the back plate 23;
is a dovetail or dovetail groove, and 23b is an arcuate recess. 31 each
31a is a fixture, each support arm 31a is formed with a long hole 3lb, and is integrated with the fixture 3l and protrudes from both ends, and 31c is fixed to the center of the fixture 31 under pressure. Anchor pins 31d are bolt holes provided on both sides of the anchor pin 31c, and 32 are support pins screwed onto both sides of the brake shoe head l1 by inserting and engaging them into the long holes 3lb of each support arm. Each bolt 33 is screwed into a screw hole lid of the brake shoe head to fix the fixture 3l to the brake shoe head l1.

Then, insert the dovetail or dovetail groove 23a of the brake shoe into the dovetail groove or dovetail lla of the brake shoe head, screw each bolt 33 into each threaded hole lid, and insert the anchor pin 31c into the arc-shaped concave part of the brake shoe. The brake shoe 2l is fixed to the brake shoe head l1 by being locked at the stop 23b. In addition, when removing the brake shoe 2l, both lower bolts 33 are screwed out from the double screw hole lid and removed, and the brake shoe 21 is temporarily received by the anchor pin 31c that engages with the arc-shaped recess 23b. It had been removed from its original state. [Problem to be Solved by the Invention] However, in this type of conventional disc brake brake shoe mounting structure, the anchor pin 31c receives the braking torque generated during braking from the brake shoe 2l, and is prevented from repeating the braking operation. Depending on the anchor bin 31c or fixture 31
Since the pushers interposed between the anchor pins 31C and the anchor pins 31C are subject to deterioration such as uneven wear, these need to be replaced periodically. During this replacement work, since both support arms 31a each have a long hole 3lb and are integrally formed with the fixture 3l, the fixture 31 can be removed by removing each support pin 32 from the brake shoe head 11. Not only did it have to be removed, which was time-consuming, but it was also difficult work as the work had to be done by crawling under the trolley.

[Means to solve the problem]

The present invention has been made in view of such conventional technical problems, and its configuration is such that a brake shoe having a back plate to which a lining is fixed can be slid on a brake shoe head or an arm of a caliper. In a disc brake brake shoe mounting structure, an anchor block having an anchor pin press-fitted therein and supporting the brake shoe is fixed to a brake shoe head or an arm of a caliper by a removable fixing means. Hanging fittings each having a long hole extending in the sliding direction of the brake shoe are provided at both ends, and a support pin fixed to the brake shoe head or the arm of the caliper is inserted into and engaged with the long hole. This is a brake shoe mounting structure for a disc brake, each of which is equipped with a disengagement means for disengaging the brake shoe from engagement with the elongated hole. The detachment means may be formed by a notch connected to the end of the long hole on the anchor block side, or may be formed by forming the hanging fitting from a spring material.

[Effect]

Therefore, when removing the brake shoe from the brake shoe head or the caliper arm, first remove the removable fixing means.
As a result, the brake shoe supported by the anchor pin descends together with the anchor block. At this time, the hanging fitting is guided by the support pin and descends, and the support bin is stopped at the upper end of the elongated hole to stop the descent. Next, the anchor block is rotated about the support pin, the support by the anchor pin is released, and the brake shoe is removed. The work of attaching the brake shoes to the brake shoe head is done by reversing the above procedure.

Further, when the anchor pin or the like is unevenly worn and needs to be replaced, after the brake shoe is removed, the detachment means is activated to disengage the support pin from the elongated hole, and the anchor block is removed. After that, work will be done to replace anchor bins, etc. If the detachment means is formed in the hanging fitting and is secured by a notch connected to the end of the elongated hole on the anchor block side, the support pin is removed from this notch. Further, when the detachment means is horizontally restrained by forming the hanging metal fittings from a spring material, both the hanging metal fittings are elastically expanded to disengage the elongated hole from the support pin.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B show a first embodiment of the present invention. 11'' indicates a brake shoe head formed with a dovetail groove or a dovetail Il'a, or a forearm or rear arm of a caliper (hereinafter simply referred to as a brake shoe head).The brake shoe 2 shown in FIG.
The brake shoe 21 is assembled by slidably fitting the dovetail or dovetail groove 23a formed in the back plate 23 of 1 into the dovetail groove or dovetail 11.degree.a of the brake shoe head 11'. Note that the back plate 23 is fixed to a fitting member in which a dovetail or dovetail groove is formed,
In some cases, this fitting member is slidably fitted to the brake shoe head 11'. Reference numeral 3 designates an anchor block, and an anchor pin 3a is press-fixed to a through hole formed in the center of the block through a pusher 3b. Each 4 is a hanging metal fitting, and has a long hole 4a extending in the sliding direction of the brake shoe 21, and a notch 4b connected to the end of the long hole 4a on the anchor block 3 side and extending substantially orthogonally to one side of the long hole 4a. is a formal precept. However, long hole 4
a and the notch 4b are L-shaped, and one end of the notch 4b is open. This notch 4b constitutes a disengagement step 34 for disengaging the support pin 6 from engagement with the elongated hole 4a, which will be described later. One end of this hanging metal fitting 4 is connected to each one of the fixing pins 5 fixed to both ends of the anchor block 3 by a presser, while being engaged with each stepped surface 3c of the anchor block 3 to prevent rotation. , are each fixed to the anchor block 3. Each 6 is a brake shoe head 11'
These are support pins for the hanging metal fittings 4 which are fixed to both sides of the hanging metal fittings 4 by pressers.

The arc-shaped recess 23b (see Fig. 4) of the brake shoe, which is slidably fitted into the brake shoe head 11', is supported by the anchor pin 3a, and the anchor block 3 is attached to both sides of the anchor pin 3a. The brake shoe head 11' is screwed to the brake shoe head 11' by a pair of ports 33, which are removable fixing means that are inserted into through holes provided in the brake shoe head 11'. However, the brake shoe head 11' of Porto 33
The length of screwing into the brake shoe head l1 is longer than the length of the long hole 4a in the horizontal direction, and with each support pin 6 locked in the upper end of the long hole 4a, each bolt 33 is inserted into the brake shoe head l1. It is slightly screwed together.

Next, the effect will be explained.

When removing the brake shoe from the brake shoe head 11°, both bolts 33 at the lower end are first removed. As a result, the brake shoe (not shown) supported by the anchor bin 3a descends together with the anchor block 3. At this time, the hanging metal fitting 4 is guided by the support pin 6 and descends, and the support pin 6 locks with the upper end of the elongated hole 4a to stop the descent. Next, the anchor block 3 is rotated using the support pin 6 as a fulcrum, and the anchor pin 3 is rotated.
Release the support provided by a and remove the brake shoe. The work of attaching the brake shoe to the brake shoe head 11' is done by reversing the procedure described above.

In addition, the anchor bin 3a or pusher 3b may wear unevenly,
When replacement is required, after removing the brake shoe, lift the anchor block 3, align the support pin 6 with the notch 4b of the hanging bracket 4, and move the anchor block 3 in the direction of the arrow shown in Figure 1 (opening). to disengage the support pin 6 from the notch 4b. After that, the anchor pin 3a or the pusher 3b is replaced.

Figure 2 (a). The second embodiment will be explained based on (2). The same reference numerals as in FIGS. 1A and 1A indicate the same parts, and their explanation will be omitted.

4' is a hanging fitting made of spring material, and a through hole 4 having a larger diameter than the head 6a of the support pin 6 is provided at the end of the anchor block 3 side of the elongated hole 4'a extending in the sliding direction of the brake shoe. It is shaped like ゜b. In this way, the hanging fitting 4' is formed of a spring material, and the through hole 4°b is provided at the lower end of the elongated hole 4'a.
It constitutes a disengagement stage 34 for disengaging the engagement with the long hole 4a of the support bin 6. The work of removing or attaching a brake shoe (not shown) from the brake shoe head 11' is done by positioning the support pin 6 at the upper end of the elongated hole 4''a and rotating the anchor block 3, which is similar to the first embodiment. Since they are essentially the same, detailed explanation will be omitted.

Next, when removing the anchor block 3, lift the anchor block 3, position the support pin 6 in the through hole 4b of the hanging fitting 4'', and tighten the free ends of both hanging fittings 4° made of spring material. The head 6a of the support pin 6 is inserted into the through hole 4' by elastically expanding outward, that is, from side to side in FIG. 2(A).
Perform by separating from b. Incidentally, when the head 6a is not formed on the support pin 6, it is sufficient to form only the elongated hole 4°a in the hanging fitting 4', and there is no need to form the through hole 4°b.

〔Effect of the invention〕

As understood from the above description, according to the present invention, the brake shoe can be easily attached and removed by rotating the support pin as a fulcrum, and only one person can replace the brake shoe after wear. In addition, the presence of the removal means makes it easier to attach and detach the anchor block, and the work can be done easily even under a cart, which is difficult to do, so the efficiency of this work is significantly improved.

[Brief explanation of the drawing]

FIG. 1(a) is a front view showing a first embodiment of the invention, FIG. 1(b) is a side view, and FIG. 2(a) is a front view showing a second embodiment of the invention. FIG. 2 (mouth) is a side view, FIG. 3 is a diagram showing a conventional example, and FIG. 4 is a diagram showing a conventional brake shoe. 3: Anchor block. 3a: Anchor bin, 3b: Push. 4: Hanging fitting, 4a; Long hole. 4b: Notch, 4
" : Hanging fitting (made of spring material), 4a: Long hole, 4'b: Through hole, 5: Fixing pin, 6: Supporting hinge. 11゜ Two brake shoe head or caliper arm 11'a: Dovetail or dovetail groove .21
: Brake shoe, 22: Lining, 23: Plate, 33: Bolt (fixing means), 34: Detachment means.

Claims (3)

[Claims] (1) A brake shoe having a back plate to which a lining is fixed is slidably fitted to a brake shoe head or a caliper arm, and an anchor block to which an anchor pin supporting the brake shoe is press-fitted is fixed. In a brake shoe mounting structure for a disc brake that is fixed to a brake shoe head or an arm of a caliper by a detachable fixing means, a suspension fitting having elongated holes extending in the sliding direction of the brake shoe at both ends of the anchor block. and a disengagement means for inserting and engaging the support pin fixed to the brake shoe head or the arm of the caliper into the elongated hole and for disengaging the support pin from the elongated hole. Disc brake brake shoe mounting structure featuring: (2) Claim (2) wherein the detachment means comprises a notch formed in the hanging fitting and connected to the end of the elongated hole on the anchor block side.
1) Brake shoe mounting structure for the disc brake described. (3) The brake shoe mounting structure for a disc brake according to claim (1), wherein the detachment means is constructed by forming a hanging metal fitting from a spring material.