JPH022488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a floating disc brake used in railway vehicles.

(Prior Art) In railway vehicles, there is a floating type disc brake that is applied to disc rotors fixed to both sides of a wheel. This will be explained with reference to FIG.

101 is a rail surface, 102 is a wheel flange, 1
03 is the tread surface of the wheel, and 104 and 104' are disc rotors fixed to both sides of the wheel. 1 is a floating type disc brake caliper, and the caliper 1 straddles the wheel and connects both pads 6,
6' are positioned opposite to both sides of the disc rotors 104, 104', and are supported by supports 2 on the vehicle body side.

When a railway vehicle is running, the wheels of the vehicle shake violently with respect to the vehicle body, and therefore, the disc rotor 10
4, 104' swings relative to the caliper 1 and the support 2 fixed to the vehicle body side, and because the energy absorbed during braking is large, the disc rotors 104, 104' wear out quickly. The gap between the disc rotor 104 and the inner surface of the rear arm (cylinder forming side) 1a of the caliper 1, which is the mounting surface of the pad 6, increases. The anchor pins corresponding to the anchor pins 4 and 5 are fixed to the rear arm 1a of the caliper 1 to guide the pad 6, unlike in FIG.

(Problems to be Solved by the Invention) In a floating type disc brake for a railway vehicle, the conventional anchor pin is fixed to the rear arm 1a of the caliper, and the pad 6 moves while being guided by the anchor pin. On the side, the depth of the guide hole cannot be increased, and if the gap between the disc rotor 104 and the inner surface of the rear arm 1a of the caliper increases, the pad 6 on the rear arm 1a side may fall off. Furthermore, since the anchor pin on the rear arm 1a side is fixed to the rear arm 1a of the caliper, replacing the pad 6 requires a lot of effort.

(Means for Solving the Problems) The present invention aims to prevent pads from falling off and facilitate pad replacement in a floating type disc brake for railway vehicles, and its configuration is as follows.

Attach an anchor pin holding member to one end of the rear arm of the caliper, which forms the cylinder of the floating disc brake, and screw it with a bolt, and insert the ring part and the head into the through hole provided in the anchor pin holding member. Slideably insert one anchor pin having a
The other anchor pin having a head is slidably inserted, and a pad mounting plate having semicircular notches at both ends and fixing the pad is slidably inserted into the pressing plate, and the piston of the cylinder is slidably inserted. The semicircular notch provided at one end of the pressing plate, which operates in A floating type disc brake for railway vehicles in which each semicircular notch of the pad mounting plate is locked to the head of each anchor pin.
In another embodiment, the anchor pin holding member is rotatable to the rear arm of the caliper.

(Function) When braking a railway vehicle, pressure oil is introduced into the cylinder formed on the rear arm of the floating disc brake caliper to activate the piston, which pushes out the pressing plate and releases the pads fixed to the pad mounting plate. This is done by slidingly contacting the disk rotor, and at that time, one anchor pin slides through a hole provided in the anchor pin holding member, and the other anchor pin slides through a hole in the rear arm, so that the pressing plate being pushed out.

To replace the pad, loosen the mounting bolt of the anchor pin holding member, remove the anchor pin holding member from the rear arm, and attach the semicircular notch of each of the pressing plate and pad mounting plate to one of the anchor pins. Release the lock, and if necessary, rotate the pressing plate around the other anchor pin, pull out the pad together with the pad mounting plate from the pressing plate, and replace the pad.

According to the embodiment, the pad is replaced while the anchor pin holding member is rotated and supported on the rear arm.

(Example) A floating type disc brake for a railway vehicle according to the present invention will be explained based on the drawings.

In FIG. 1, 1 is a caliper, 1a is a rear arm of the caliper 1, and a cylinder (not shown) is formed therein. The caliper 1 is floatingly supported by the support 2 with both bolts 15, 15. At one end of the rear arm 1a (lower end in the figure), an anchor pin holding member 3 with which the rear arm 1a can be combined is attached, and the tip of the arm 3a is rotated by a pin 3b to a protrusion formed on the rear arm 1a. It is movably pivoted, and both mounting bolts 3c, 3c
It is screwed and fixed to one end of the rear arm 1a. Both mounting bolts 3 of anchor pin holding member 3
A through hole 3d is provided in the intermediate portion between c and 3c, and a bush 3e is press-fitted and fixed into the through hole 3d, as shown in detail in FIG. 4 is one anchor pin that can slide inside the bush 3e, and is formed with a shaft portion 4a and a ring portion 4b having a larger diameter than the shaft portion 4a;
A locking portion 4c having the same diameter as the shaft portion 4a and a head portion 4d having a larger diameter than the locking portion 4c are formed at the tip. The shaft portion 4a slides inside the bush 3e, and the inner peripheral surface of a semicircular notch 8a formed at one end of the pressing plate 8 is stopped at the locking portion 4c, and the ring portion 4
b and the head 4d sandwich both sides of the semicircular notch 8a, and the head 4d has the inner peripheral surface of the semicircular notch 7a formed at one end of the pad mounting plate 7. It is locked.

Further, a through hole 1d is provided at the other end of the rear arm 1a, into which a bush 1e is press-fitted and fixed. The other anchor pin 5 consists of a shaft portion 5a and a head portion 5d having a larger diameter than the shaft portion 5a at the distal end.
is inserted into the through hole 8b formed at the other end of the pressing plate 8, and is slidably inserted into the bush 1e, and the head 5d has a pad formed at the other end of the mounting plate 7. The inner circumferential surface of the semicircular notch 7b is engaged.

Pad 6 divided into four pieces as shown in Figure 1
However, as shown in Fig. 3, the backing metal 6 of each pad
Pad mounting plate 7 with a fixed with rivets 6b
are slidably inserted into grooves 8c and 8d provided oppositely on the longitudinal edge of the pressing plate 8.

FIG. 4 shows the pressing plate 8. 8a is a semicircular notch formed at one end, 8b is a through hole provided at the other end, and 8c and 8d are provided opposite to the longitudinal edge of the pressing plate 8 for pad attachment. This is a groove into which the plate 7 can be inserted from the semicircular notch 8a side. In the center, two through holes 8h are formed in which the peripheries of the large diameter hole 8e and the small diameter hole 8f are connected by thin parts 8g and 8g' forming concentric arcs centered on the center of the small diameter hole 8f. , 8h' are provided. Connect the heads of a pair of pistons of an auto adjuster (not shown) to both large diameter holes 8e,
8e, the pressing plate 8 is rotated around the other anchor pin 5 inserted into the through hole 8b, and the thin parts 8g and 8g' on the periphery of both small diameter holes 8f and 8f are held between the heads of both pistons. A piston sliding in a cylinder (not shown) contacts the opposite surface of the pressing plate 8 on which the grooves 8c and 8d are formed.

FIG. 5 shows a part of the forearm 1b provided on the caliper 1 opposite to the rear arm 1a of the caliper. At both ends of the forearm 1b (upper and lower ends in Figure 1),
Respective through holes 1c are provided, and anchor pins 9 are press-fitted and fixed in each of the through holes 1c. The tips of both anchor pins 9 fit into respective through holes 7'a provided at both ends of the pad mounting plate 7', and the back metal 6'a of the pad 6' is fixed to the pad mounting plate 7'. has been done.
Then, on the inner surface of the forearm 1b, there are a plurality of screws 1.
Both mounting brackets 10a fixed with 1a and 11b,
The upper and lower edges (as shown in FIG. 5) of the pad mounting plate 7' are fixed at 10b.

Next, the effect will be explained.

When braking a railway vehicle, when pressure oil is introduced into a cylinder (not shown) and the piston is actuated, the pressing plate 8 that comes into contact with the tip of the piston rod will have its semicircular notch 8a close to the ring part of one of the anchor pins. 4b and the head 4d, and the other anchor pin 5 is fitted into the through hole 8b so that the head 5d of the anchor pin
Since the anchor pins 4 and 5 are locked to the inner annular surface of the caliper,
The pad 6, which is integrated with the pressing plate 8, comes into sliding contact with the surface of one disc rotor 104, and the braking torque at that time is applied to the semicircular shape of the pad mounting plate. From the notch 7a or 7b to the head 4d or 5 of both anchor pins.
d to both anchor pins 4 and 5.
Further, due to the reaction, the forearm 1b slides on both bolts 15, 15 supported by the support 2, and the pad 6' slides into contact with the surface of the disk rotor 104' on the other side, thereby braking the railway vehicle. At this time, both anchor pins 4 and 5 have longer through holes 3d and 1d than before.
Since the disc rotor 104 and the pad 6 slide inside the bushes 3e and 1e provided in the rear arm 1a, even if the disk rotor 104 and the pad 6 are significantly worn and the pressing plate 8 protrudes severely from the inner surface of the rear arm 1a, each anchor pin 4,5
does not escape from each through hole 3d, 1d.

Next, the replacement work of both pads 6, 6' will be explained.

Both bolts 3c, 3c are loosened, and the anchor pin holding member 3 is rotated around the pin 3b. In the embodiment, the anchor pin holding member 3 is rotated by gravity. In this way, the semicircular notch 8a of the pressing plate and the semicircular notch 7a of the pad attachment plate are released from the anchor pin 4, and the pressing plate 8 is moved around the anchor pin 5 as necessary. rotate it,
Press the pad 6 together with the pad mounting plate 7 on both grooves 8 of the plate.
Remove it from c and 8d and replace the pad.

To replace the pad 6' on the forearm 1b side, after removing the pad mounting plate 7, attach the caliper 1 to the forearm 1b.
Move the bolts 15, 15 in the side direction to create a gap with the other disc rotor 104',
After removing the screws 11a and 11b, the pad mounting plate 7' is removed from each anchor pin 9, and the pad 6' is replaced.

The installation of the replaced pads 6 and 6' is as follows:
This is done in the reverse order of the removal process described above.

(Effects of the Invention) As understood from the above explanation, the floating disc brake for railway vehicles according to the present invention provides the following effects.

(1) The pad mounting plate that fixes the pad is integrally inserted into the pressing plate, and the pressing plate moves by locking onto both anchor pins guided through relatively long holes. Even if the pad wears out and the amount of protrusion of the pressing plate from the inner surface of the rear arm of the caliper increases, the anchor pins will not escape from the through holes, and the pad will not fall off.

(2) By removing the anchor pin holding member from the rear arm, one of the anchor pins can be removed from the rear arm, so by removing the pad together with the pad mounting plate from the pressing plate, the pad on the rear arm can be replaced. This makes it easy to replace the pad on the forearm side.

The notch at one end of the pressing plate locks onto one of the anchor pins and allows some relative movement, so the thermal expansion of the pressing plate is well absorbed and no bending deformation occurs. The head of the piston that operates the piston is less likely to be strained.

[Brief explanation of drawings]

FIG. 1 is a diagram of an embodiment of a floating type disc brake for a railway vehicle according to the present invention, and FIG. 2 is a sectional view showing a state in which an anchor pin is inserted into an anchor pin holding member and a rear arm of a caliper. 3 is a cross-sectional view showing the pad attached to the rear arm of the caliper, FIG. 4 is a view of the pressing plate, and FIG. 5 is a cross-sectional view showing the pad attached to the forearm of the caliper. 1: Caliper, 1a: Back arm, 1b: Forearm, 1
d: Through hole, 2: Support, 3: Anchor pin holding member, 3a: Arm, 3b: Pin, 3d: Through hole, 4:
One anchor pin, 4a: shaft part, 4b: ring part, 4c: locking part, 4d: head part, 5: other anchor pin, 5a: shaft part, 5d: head part, 6, 6':
Padded, 7, 7': Padded mounting plate, 7a, 7b:
Semicircular notch, 8: Pressing plate, 8a: Semicircular notch, 8b: Through hole, 8c, 8d: Groove.

Claims (1)

[Claims] 1. An anchor pin holding member is attached to one end of the rear arm of the caliper that forms the cylinder of a floating type disc brake, and is screwed with a bolt, and the anchor pin holding member is screwed into the through hole provided in the anchor pin holding member. , one anchor pin having a ring portion and a head is slidably inserted, and the other anchor pin having a head is slidably inserted into a through hole provided at the other end of the rear arm of the caliper. A semicircular notch is provided at both ends,
A pad mounting plate with a pad fixed thereon is slidably inserted into the pressing plate, and a semicircular notch provided at one end of the pressing plate operated by the piston of the cylinder is connected to the head of one anchor pin and the ring. sandwiched between
The other anchor pin is fitted and inserted into the through hole provided at the other end, and each semicircular notch of the pad mounting plate is locked to the head of each anchor pin. Floating type disc brake for railway vehicles. 2. A floating type disc brake for a railway vehicle according to claim 1, wherein the anchor pin holding member is provided with an arm, and the arm is rotatably supported on the rear arm.