JP2006002848A - Pad fall preventive device of disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fall preventive device for a brake pad used in a disc brake device of a railroad car etc. assuring certain fall preventing function and capable of improving the operating easiness. <P>SOLUTION: The brake pad fall preventive device is structured so that the pad is installed by inserting from below a pad holder, fall preventive members to prevent the pad attached to the pad holder from falling off are installed movably in the lower part of the pad holder, and that the pad holder and an engaging member installed on one of the fall preventive members will be engaged with an engagement part provided on the other fall preventive member when the fall preventive members have moved from the open position to admit pad insertion to the acting position where the pad fall is precluded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a brake pad fall prevention device in a disc brake device such as a railway vehicle.

  In railway vehicles, brake devices have been used for a long time to apply friction material directly to the wheel for braking, but in recent years, instead of applying friction material to the wheel, braking force is applied to the disc attached to the axle. Disc brake devices are widely used. This disc brake device brakes a disc by sandwiching the disc with friction materials (pads) from both sides.

  FIG. 10 exemplifies a general disc brake device of this type. A brake disc D is attached to an axle A, and a bifurcated clamp lever (brake rod) K, K is provided. The base of the clamp lever K is supported by a vehicle support frame.

  The brake lever (pad) P is attached to the tip of the clamp lever K. By injecting high-pressure air into the diaphragm B and expanding the diaphragm, the clamp lever K is rotated in the braking direction, The disk D is clamped from the left and right by the pads P and P to brake the disk. Some brakes use cylinders instead of diaphragms.

  The pad is supported by a pad holder, and various systems have been proposed for the support structure. Among these, there is also known one that improves the reliability by providing means for preventing the pad attached to the pad holder from being unexpectedly dropped (see, for example, Patent Documents 1 and 2).

JP-A-8-326795 JP 2003-14012 A

  In the following, symbols described in the above-mentioned patent document are displayed enclosed in parentheses, and the structure thereof will be briefly described. First, what is disclosed in the above-mentioned Patent Document 1 is an anchor block (falling prevention) in which a recess (9) of a pad (3) is rotatably attached to a caliper (pad holder) (1) by a hinge (8). The member (6) is engaged and the anchor block (6) is attached to the caliper (1) by the bolt (7) so that the pad (3) does not fall.

  In addition, what is disclosed in the above-mentioned Patent Document 2 is a member in which the fall prevention is performed by a swingable member, and this member is biased by a spring. That is, the straight portion (17c) of the snap pin (17) attached to the latch (15) as the fall prevention member via the connecting chain (16) is inserted into the pin hole (19) below the pad holder (8). In addition, by fitting the curved portion (17b) into the groove portion (21) below the pad holder (8), the latch (15) is sandwiched between the straight portion (17c) and the curved portion (17b), and swinging is restricted. By doing so, the pad is prevented from falling unintentionally.

  However, what is described in Patent Document 1 is that the anchor block (falling prevention member) (6) is locked with the caliper (pad holder) (1) by bolting. In space, work is cumbersome. Moreover, although what is described in the said patent document 2 is thought that it is perfect regarding prevention of a fall of a pad, this also has a snap pin (17) in the pin hole ( 19) There is a problem that the operation such as insertion is complicated and difficult and takes time and effort.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fall prevention device that improves the pad fall prevention method in the conventional disc brake device described above, has a reliable fall prevention function, and can improve workability.

  In order to solve the above problems, the present invention employs the following configuration. That is, the pad fall prevention device according to the present invention is a disc brake device that applies a braking force via a pair of pads that are attached to a vehicle carriage and are held by a pad holder on a disc on the axle side. It has a structure to be inserted and attached from the bottom of the holder, and a fall prevention member that prevents the pad attached to the pad holder from falling is provided movably below the pad holder, and the fall prevention member can insert the pad. When the pad is moved from the open position to the working position for preventing the pad from dropping, the locking member provided on one of the pad holder and the fall prevention member is locked to the engaging portion provided on the other. It is characterized by being configured as described above.

  As described in claim 2, a pin urged by an elastic body is used as the locking member, and the pad is prevented from falling by inserting the pin into a recess provided on the other side. It is preferable to do this. Further, the fall prevention member is preferably biased in the axial direction of the disk with respect to the pad holder as described in claim 3.

  This pad fall prevention device has a structure in which the pad is inserted and attached from the lower side of the pad holder, and a fall prevention member for preventing the pad attached to the pad holder from falling is provided. Retention is certain. Further, when the fall prevention member is movably provided at the lower part of the pad holder and the fall prevention member moves from an open position where the pad can be inserted to an operation position which prevents the pad from falling, Since the locking member provided on one of the pad holder and the fall prevention member is engaged with the engagement portion provided on the other, the fall prevention member can be used without specially fixing the fall prevention member. The pad is reliably prevented from falling.

  Embodiments of the present invention will be specifically described below. The figure exemplifies an embodiment of the present invention, and the pad fall prevention device 1 includes a pad holder 2 in which a vertical dovetail groove 2a is cut on a working surface facing the brake disk D. On the back side of the pad holder 2, a pair of upper and lower bearings 3, 3 project at a predetermined interval, and a guide pin 4 is supported by the bearings 3, 3. The pad holder 2 is operated by opening and closing the caliper by connecting the guide pin 4 supported by the bearings 3 and 3 to a caliper (brake rod) K of the disc brake device. In the figure, 5 is a bush, and 6 is a split pin for preventing the pin 4 from deviating.

  An elongated slit 7 in the lateral direction leading to the front and back is formed in the upper part of the pad holder 2, and a pad rattle prevention spring 9 made up of a bent leaf spring shown in the figure is inserted through the slit 7 from the back side. A pair of left and right reinforcing ribs 11 are provided on the back side of the pad holder 2. Further, on the side of the reinforcing rib 11, a magnet support shaft 13 parallel to the rib is supported by brackets 14 and 14 so as to be rotatable about the axis. Arms 15 a and 15 a that support the upper and lower magnets 15 and 15 are attached to the magnet support shaft 13. These two magnets are provided so as to be able to contact the back side of the pad through through holes 16 provided in the pad holder 2.

  A bearing 17 for receiving the end of the magnet support shaft 13 and a bracket 18 are provided below the pad holder 2. A fall prevention member (latch) 20 for preventing the pad from dropping is attached to the end of the support shaft 13, and the support shaft 13 rotates around the support shaft.

  FIG. 5 shows the pad fall prevention member 20. A pin hole 21 is provided at the tip of the fall prevention member 20, and a convex part 20 a that protrudes to the surface side of the pad holder 2 is provided at the intermediate part. In addition, a spring insertion hole 22 is provided at a position near the end of the protruding portion. A portion of the fall prevention member 20 on the tip side of the pin hole 21 is formed as a tapered portion 20b so that the tip side becomes gradually thinner. A base portion of a U-shaped spring 25 is inserted into the spring insertion hole 22 in the middle portion of the fall prevention member 20, and an end portion thereof is bent along the plate surface of the pad fall prevention member 20, so that it is prevented from coming out. ing. The opposite end of the U-shaped spring 25 is inserted into a through hole 18 a provided in the bracket 18. Although the U-shaped spring 25 has a natural length at the open position where the fall prevention member 20 is separated from the pad holder 2, the fall prevention member 20 is arranged in a closing direction in which the convex portion 20 a of the intermediate portion projects to the surface side of the pad holder 2. When moving, the U-shaped spring 25 extends again after passing through the most compressed point. For this reason, the fall prevention member 20 is urged by the U-shaped spring 25 so that the state is maintained by the U-shaped spring 25 both in the open position and in the closed position.

  A spring plunger 27 having a coil spring and a pin is attached to the bracket 18 as a locking member. The pin 28 of this plunger is urged by a coil spring in a direction projecting toward the fall prevention member 20, and in the projecting state, the pin 28 is fitted into the pin hole 21 that is an engaging portion. The plunger 27 functions as an index plunger for positioning, and a pin pulling ring 29 is attached to the rear end portion of the pin 28. As the locking member, a member having other appropriate locking means may be used. Further, the locking member (plunger) 27 may be provided on the fall prevention member 20 side, and the engaging portion (pin hole) 21 may be provided on the pad holder side.

  As shown in FIGS. 6 and 7, an ant (key) 30a slidably fitted in the dovetail groove 2a is formed in the vertical dovetail groove 2a cut on the surface (working surface) side of the pad holder 2. A pad 30 comprising The attachment is performed by inserting the ant 30a of the pad 30 into the ant groove 2a from below. Reference numeral 30b in the figure denotes a magnetic (iron plate) liner mounted on the back surface of the pad.

  The lower end portion of the pad 30 attached to the pad holder 2 is urged by a fall prevention member 20 biased in a direction in which the lower end portion of the dovetail groove 2a is closed by the U-shaped spring 25, that is, in a closing direction protruding toward the dovetail groove side. Supported. For this reason, the pad 30 attached to the pad holder 2 does not deviate.

  Further, when the fall prevention member 20 is in the closed position, i.e., in the position where the lower end of the dovetail groove 2a is closed, the pin 28 of the spring plunger 27 biased by the internal coil spring is placed in the pin hole 21 of the fall prevention member 20. Since the fitting is performed, the movement (swing in the illustrated example) of the fall prevention member 20 is restricted. For this reason, the fall prevention member 20 does not move out of the operating position, and the function of preventing the pad 30 from deviating becomes more reliable.

  On the other hand, the upper end portion of the pad 30 attached to the pad holder 2 through the fitting of the dovetail 30a and the dovetail groove 2a is elastically pressed by the rattle prevention spring 9 protruding from the slit 7 toward the dovetail groove side. The rattling during traveling of the vehicle is prevented. For this reason, there are few noises and vibrations during driving | running | working and damage to components is also suppressed.

  When replacing the braking pad 30 of the disc brake device, the pin 28 of the plunger 27 is pulled into the pin hole by pulling the ring 29 after diving in the lower space of the vehicle and preparing to receive the pad 30. 21. The fall prevention member 20 is rotated in the opening direction, that is, the lower end of the dovetail groove 2a is opened against the urging force of the U-shaped spring 25. During this rotation, the U-shaped spring 25 passes through a point where it is most compressed and then expands. Therefore, the fall prevention member 20 that has passed through this point is opened most by the U-shaped spring 25 even when the hand is released. Held in a state. For this reason, work is easy. When the fall prevention member 20 is opened, the pad 30 descends along the dovetail groove 2a.

  When a new pad 30 is attached to the pad holder 2, the pad 30 is inserted along the dovetail groove 2a from the lower side of the holder 2 with the fall prevention member 20 rotated in the opening direction. After that, if the fall prevention member 20 is rotated in the closing direction against the urging force of the U-shaped spring 25, the fall prevention member 20 passes through the most compressed point of the U-shaped spring 25, and then the ant The closed position where the groove 2a is closed is reached, and is stably held there. When the fall prevention member 20 is fully moved, the pin hole 21 comes to the position of the pin 28 of the plunger 27. At this time, the pin 28 urged in the protruding direction by the internal coil spring is moved to the position of the fall prevention member 20. It protrudes while being guided by the taper portion 20 b and is inserted into the pin hole 21 of the fall prevention member 20. Thereby, the movement of the fall preventing member 20 is restricted, and the pad 30 is securely held by the pad holder 2.

  Since this pad fall prevention device closes the end of the groove for pad attachment by the fall prevention member 20 that moves in a direction different from the insertion direction for pad attachment (the right angle direction in the illustrated example), the operation is simple. is there. Moreover, since the spring plunger 27 is provided as a means for restricting the movement of the fall prevention member 20 in the opening direction, the movement of the fall prevention member 20 can be locked simultaneously with the closing of the mounting groove by the fall prevention member 20. it can. For this reason, the fall prevention operation can be performed very simply and reliably.

  In the illustrated example, a magnet 15 is attached to the shaft 13 for operating the fall prevention member 20 via an arm, and the magnet moves in the through hole 16 as the fall prevention member 20 moves to the operating position. It is attracted to the back surface of the pad 30. For this reason, the movement of the pad is restricted and the generation of vibration and noise is suppressed together with the anti-rattle spring. However, in some cases, such a magnet and anti-rattle spring may not be provided. Furthermore, in the illustrated example, the fall prevention member 20 is rotated about the shaft 13, but the dovetail may be opened and closed by moving in the lateral direction or the front-rear direction.

  As is clear from the above description, the pad fall prevention device of the disc brake device according to the present invention has a structure in which a pad for clamping and braking a disc is attached to the pad holder from below, and a groove for the attachment is attached to the pad holder. Since the fall prevention member that moves and closes in a direction different from the direction is provided, the pad can be easily attached and detached even in a narrow space below the vehicle, and the deviation of the pad is reliably prevented. For this reason, it can be widely used for a brake device of a railway vehicle and other vehicles.

It is a rear view of a pad holder. It is the left view. FIG. It is the bottom view. It is the front view (a) and side view (b) of a fall prevention member. It is a front view of a pad. It is sectional drawing showing the attachment state. It is a front view of a U-shaped spring. It is an external view of a rattling prevention spring. It is explanatory drawing of a disc brake device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fall prevention apparatus 2 Pad holder 4 Pin 9 Backlash prevention spring 13 Support shaft 15 Magnet 20 Fall prevention member 21 Pin hole (engagement part)
27 Spring plunger (locking member)
30 pads

Claims (3)

In a disc brake device that is attached to a vehicle carriage and applies a braking force via a pair of pads held by a pad holder on an axle side disc, the pad is inserted and attached from below the pad holder, An action for preventing the pad from dropping from an open position in which the fall preventing member can be inserted into the pad holder, and a fall preventing member for preventing the pad attached to the pad holder from being dropped is provided below the pad holder. A disc brake device comprising: a locking member provided on one of the pad holder and the fall-preventing member so as to engage with an engaging portion provided on the other when moved to a position. Pad fall prevention device. 2. The pad fall prevention device for a disc brake device according to claim 1, wherein the locking member is a pin urged by an elastic body in a direction in which the pad falls and the engagement portion is a recess into which the pin is fitted. The pad fall prevention of the disc brake device according to claim 1 or 2, wherein the fall prevention member is attached to the pad holder so as to be swingable in the disc axial direction and is urged by the elastic body in the disc axial direction. apparatus.

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