JPH04165129A - Pad for disc brake - Google Patents

Abstract

PURPOSE:To prevent the warpage of a pad by press-fitting a press-fitting pin between a pressure plate and an anchor plate, and calking rivets at both the ends of the press-fitting pin so as to be movable in a tangential direction to a disc. CONSTITUTION:A disc brake pad has a pressure plate 1, a lining 2 and an anchor plate 3. The anchor plate 3 and the pressure plate 1 are connected through a press-fitting pin 4, and moreover connected using rivets 5, 6, 7, 8, and the rivets 5, 7 near the press-fitting pin 4 are approached through holes 1b, 3b, and the rivets 6, 8 far from the pin 4 are set in a loosely inserted state having a gap delta in a tangential direction to the through hole 1c of the pressure plate 1. When the pressure plate 1 is heated by the friction of the lining 2 to expand, the gap delta allows the free elongation of the pressure plate to prevent the occurrence of its warpage. Thus the partial abrasion of the pressure plate and the deterioration of the connecting and disconnecting ability can be prevented.

Description

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

[Conventional technology]

As a conventional disc brake pad of this type, for example, those shown in FIGS. 4 and 5 are known. In the disc brake butt 50, a lining 52 is fixed to one side of a pressure plate 51, and an anchor plate 53 having a dovetail or dovetail groove 53a is fixed to the other side. Such a disc brake pad 50 is anchored in an arc-shaped recess 53b of the anchor plate 53 by inserting the dovetail or dovetail groove 53a of the anchor plate 53 into the dovetail groove or dovetail of the brake shoe head (not shown) of the railway vehicle. The lining 52 is attached by locking a pin and slides against a disk 57 that rotates together with the wheel to obtain braking force.

In this disc brake pad 50, two press-fit pins 5 are provided between the pressure plate 51 and the anchor plate 53 at intervals in the tangential direction A of the disc 57.
4 is press-fitted, and a 3-wooden rivet 5 is inserted between both press-fit pins 54.
5 is tightened, one glue head 56 is tightened on the outside of each press-fit pin 54, and the pressure plate 51 is tightened.
and Ancuba L□-1□53 are assembled together and replaced. Therefore, the tangential force and moment generated when the lining 52 slides against the disk is supported by the two press-fit pins 54 and five glues via the anchor plates 1-5 and 1-5.

[Problem to be solved by the invention]

However, in the case of such a conventional de-1' disc brake screw 1-50, there are a plurality of press-fit pins 54, and all the pins 1-55.56 have a pressure l/-.
l□ 51 and anchor play!・Since the structure is closely inserted into the 53, there is a problem that warping occurs due to repeated braking operations.

The pet transformation process will be explained in detail. First, during braking, the lining 52 that is in sliding contact with the disc 57 generates heat, and the solenoid plate I.51 is heated, causing elongation and deformation due to thermal stress. Along with this deformation of the pressure plate 51, the low-temperature anchor plate 53 is also deformed together and reaches a plastic region. With cooling after the brake is released, the pressure plate 51 and the anchor plates 1-53
Yes! 1 tries to restore to the size before thermal expansion, but because the anchor plate 53 is plastically deformed and prevents permanent deformation, only the pressure plate 51 is restored and is not shown in Figure 6. This causes the rose 150 to warp.

As a result, the anchor plate 153 and the dovetail groove of the brake shoe spatula come into strong pressure contact, making it difficult to pull out the anchor plate 53 from the brake shoe when replacing the pads. It will also be difficult to reuse Play I.53.

[Means for Solving the Problems] The present invention has been made in consideration of the conventional technical problems as described above, and has a structure including a pressure plate, and one surface of the pressure plate fixed to the surface of the pressure plate. A disk-key part I that includes a lining and an anchor plate coupled to the other side of the pressure plate, and the lie-on slides in sliding contact with a disk that rotates together with the wheel.
Then, place it in the center and press the pre-tunya play I.
A wooden press-fit pin is press-fitted between the press-fit pin and the anchor plate, and the rivets located at both ends of the press-fit pin are connected to the pressure by allowing relative displacement based on the difference in thermal expansion in the tangential direction of the disk. This is a disc brake pad that is caulked between the plate and the anchor plate.

(Function) This disc brake pad is a disc brake L/-
:Incorporated into f- and used for braking operation. When the brake W)J is in operation, the lining comes into sliding contact with the disc that rotates with the wheel, providing braking force. At this time, the tangential force is firmly supported by a single press-fit pin.

As the braking operation occurs, the temperature of the lining increases due to frictional heat, and the pressure plate is also heated. Due to this braking heating, the pressure plate I, to which the lining is fixed, has a large thermal expansion gap, but the rivets located at both ends of the press-fit pin allow relative displacement based on the difference in thermal expansion in the tangential direction of the disk to increase the pressure. Since the pressure plate is caulked between the plate and the anchor plate, the tangential end of the pressure plate can freely extend with respect to the anchor plate, and the anchor plate will not be deformed. Then, when the braking operation is completed and the lining is cooled, the pressure plate 1- contracts and returns to its original state.

〔Example〕

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

1 to 31 show one embodiment of the present invention. This disc brake cross l''] Ot; and a coupled anchor plate 3.

Between the pressure plate 1 and the anchor plate 3 is a disk 11 with which the lining 2 comes into sliding contact.
One press-fit pin 4 located at the center in the tangential direction of
Combine by. This press-fit pin 4 has the function of supporting the tangential force that is lost in braking, and as shown in FIG.
Both are press-fitted into the through holes 3a of No. 3.

Further, the pressure plate 1 and the anchor plate 3 are connected by a pair of press-fit pins 4 arranged on each side, or by heads 5, 6, 7.8. The glue heads 5, 7 on the side closer to the press-fit pin 4 are connected to the through hole 1b of the pressure plate 1 and the through hole 3b of the anchor plate 3, as shown in FIG.
are inserted closely together and substantially secured by staking. The rivets 5, 7 are located closer to the press-fit pin 4 than the center position between the rivets 1-6, 8 located at the ends and the press-fit pin 4.

On the other hand, the head 6.8 located at the end far from the press-fit pin 4 is arranged between the pressure plate 1 and the anchor plate 3 by allowing relative displacement based on the difference in thermal expansion in the tangential direction A of the disk 11. It is caulked. That is, the rivet 6.8 is inserted from the pressure plate 1 side, and as shown in FIG. The pressure plate 1 and the anchor plate 3 are closely inserted through the through holes 3c of 3, and the pressure plate 1 and the anchor plate 3 are integrated only in the thickness direction. This gap δ is formed, for example, by setting the diameter of the rivet 6.8 and the through hole 3c of the anchor plate 3 to 10.5 mm, and setting the diameter of the through hole IC of the pressure plate 1 to 12.5 mm.

Such a gap δ is set based on the following equation.

However, pressure plate l and anchor plate 3 are
Both are made of steel.

δ〉ΔL-α・ΔT-L Here, ΔL; Difference in elongation between pressure plate 1 and anchor plate 3 α(1/'C) (-15,0XIO-6); Coefficient of linear expansion of steel ΔT['C]; Temperature difference L (mm) (-136mm); Distance from press-fit pin 4 to rivets 6, 8, and difference between temperature difference ΔT('C) and elongation ΔL (mm)
The relationship with is as shown in the following table ψ.

Here, T+ ('C) (=750°C); Temperature of lining 2 T2 [''C) (-550°C); Temperature of pressure plate 1 T3 ('C) (=420'C); Anchor plate 3 temperature (however, 'r, , T2 and T3 are speed ■. = 2701
Measured by on/h dynamo test. ) In the above table, considering that the temperature measurement point of the pressure plate 1 at Tt T3 is the contact surface with the relatively low temperature anchor plate 3, T, -T, 1, that is, the temperature of the pressure plate 1 is the temperature of the lining. The study also assumed that the temperature had risen to a level similar to that of 2.

From the above table, in order to satisfy δ>ΔL, the gap δ [mm] given by the difference between the radius of the through hole IC of the pressure plate 1 and the radius of the through hole 3C of the anchor plate 3 is:
1+++m is enough for 2. Therefore, setting the pressure plate 10 through hole IC to 12.5 mm+ and setting the anchor plate 3 through hole 3C to 10.5 mm is sufficient to absorb the difference in thermal expansion. .

Note that 9 shown in the first example indicates a glue head for fixing the lining 2 to the pressure plate 1.

Next, the effect will be explained.

The disc brake pad 10 having the above configuration is incorporated into a disc brake of a railway vehicle and used for braking operation. During braking, the lining 2 comes into sliding contact with the disk 11 that rotates together with the wheels, providing braking force. At this time, the tangential force is firmly supported by the single press-fit pin 4, and the moment is mainly supported by the pair of rivets 5, 7 on the side closer to the press-fit pin 4.

As the braking operation is performed, the temperature of the lining 2 increases due to frictional heat, and the pressure plate 1 is also heated. Due to this braking heating, the pressure plate 1 undergoes a large thermal expansion, but the rivet 6.8 on the side far from the press fit bottle 4
is integrated with the anchor plate 3 and loosely inserted into the through hole IC of the pressure plate 1, so that the tangential end of the pressure plate 1 can freely extend with respect to the anchor plate 3 as shown in FIG. do. At this time, Li Tsul
−6, 8 reduces the inner gap δ of the pressure plate 1 with respect to the through hole IC to the gap δ1.

When the braking operation is completed and the lining 2 is cooled, the pressure plate 1 contracts and the gap δ between the through hole 1c of the pressure plate 1 and the rivet 6.8 is restored to a predetermined value.

By the way, in the above embodiment, the gap δ with the rivet 6.8 was formed only between the through hole 1c of the pressure brake 1.1, but the gap Q with the through hole 3C of the anchor plate 3 was formed. The same effect can be obtained by forming it for this reason or between the two-way holes lc and 3c.

[Effects of the Invention] As can be understood from the above explanation, according to the disc brake pad according to the present invention, the temperature between the pressure plate and the anchor brake 1 during braking operation can be reduced without increasing the rigidity of the component parts. The thermal expansion difference due to the difference is absorbed and free thermal expansion of the pressure plate 1 or the anchor plate is allowed, which prevents plastic deformation of the anchor plate and thus warping of the pad, and prevents dragging and uneven wear caused by deformation of the lining. This has the practical effect of not only avoiding this, but also preventing deterioration in the ease of attaching and detaching the pad.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a diagram showing a pad for a disc brake, FIG. 2 is a sectional view showing the main parts of the pad for a disc brake, and FIG. , 4 to 6 show conventional examples, FIG. 4 is a diagram showing a pad for a disc brake, FIG. 5 is a sectional view showing a main part of the pad for a disc brake, and FIG. 6 is an explanatory diagram of the operation. 1: Pressure plate, la, lb, 1c: Through hole, 2
Ni lining, 3, anchor plates 13a, 3b, 3c
: Through hole, 4: Press-fit bottle, 5.6゜7.8: Rehet, 1
0: Pad for disc brake, 11: Dice tip A = tangential direction, δ: Gap. Agent Patent Attorney Former 1) Hiroshi

Claims (1)

[Claims] (1) A disc brake comprising a pressure plate, a lining fixed to one side of the pressure plate, and an anchor plate coupled to the other side of the pressure plate, and the lining slidingly contacts a disc rotating together with the wheel. A press-fit pin is press-fitted between the pressure plate and the anchor plate at the center, and rivets located at both ends of the press-fit pin are inserted in the tangential direction of the disk. A disc brake pad characterized in that the pad is caulked between the pressure plate and the anchor plate while allowing relative displacement based on a difference in thermal expansion.