JP2003014012A - Pad attaching structure for disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide easy pad replacing work capable of freely releasing support of only a pad without causing careless dropping of the pad. SOLUTION: The disc brake device is provided with a cylinder and a caliper body straddling an axle shaft side disc via a pair of pads 5. It is characterized by that it has a pad attaching structure of attaching and detaching by providing a key part 12 of a pad from vertically below along a key groove 11 provided on a pad holding part 8 of a caliper body side, and it is provided with a latch 15 swingably supported below the pad holding part 8 by a pin 13, energized in the disc axial direction by a spring 14, locked to the key part, and supporting the pad, a snap pin 17 inserted in a lower part of the pad holding part and regulating swinging of the latch in an unlocking direction to the pad, and a connecting chain 16 connected with the latch and preventing loosening and misplacement of the snap pin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad mounting structure for a disc brake device, and more particularly to a disc brake device used for braking a railway vehicle.

[0002]

2. Description of the Related Art In recent years, particularly in the braking of railway vehicles,
In place of the conventional type in which a friction material is pressed against the wheel tread, a disc brake device that obtains a braking force without causing damage to the wheel tread is increasingly used.
This disc brake device obtains a braking force by attaching a disc for friction (hereinafter referred to as "disc") to a wheel or an axle and sandwiching it with a friction material (hereinafter referred to as "pad").

FIG. 6 shows a general example of a conventional disc brake device. This is a side view showing a state in which the vehicle bogie frame A is attached. This disc brake device 100 supports a caliper body 100a that straddles a disc (not shown) fixed to both side surfaces of an iron wheel D, a cylinder portion 100b that presses a pad 101 against the disc, and a pad 101. And a torque receiving portion 100c that receives a braking torque. The pad 101 is supported by engaging U-shaped notch grooves 101 a at both ends with a cantilever pin 103 integrated with an anchor block 104. Mounting bolt 105 for fixing the anchor block 104 to the torque receiving portion 100c.
In order to prevent slack while traveling on the railway, the slack is prevented by a tangling line or a washer with a tongue penetrating the head.

In such a disc brake device for a railway vehicle, when the pad is worn, it is necessary to replace the pad, but first, the vehicle is moved to a pit such as a maintenance base and the only open space is available. It is done by pulling it down a certain amount and attaching a new pad by the reverse operation.

[0005]

However, this pad has a considerably large sliding area as compared with that for automobiles, and since it is inevitably required to have rigidity and strength, it becomes a thick plate and also has its own weight. It becomes quite a thing. In order to replace such a pad, first, the loosening prevention of the mounting bolt 105 is released, and the mounting bolt 105 is loosened while paying attention to the pad 101 falling by its own weight. At this time, the total weight of the pad 101 and the anchor block 104 is to be supported by one hand, and it is difficult to grasp the timing of dropping the pad. For this reason, the pad replacement work is forced to be considerably difficult.

Further, it is necessary to prevent the mounting bolts from loosening by the entanglement wire every time the pads are replaced, which is not preferable from the viewpoint of workability. Skillfulness is also required to properly install the slack stop.

In view of the above situation, the present invention provides
Achieves easy pad replacement work that can freely release the support of the pad without inadvertently dropping the pad, and also the troublesome and skilled work of locking the bolts with the entanglement line It is an object of the present invention to provide a pad mounting structure for a disc brake device that does not require the above.

[0008]

A pad mounting structure for a disc brake device according to claim 1 for solving the above-mentioned problems is a caliper body mounted on a bogie of a vehicle and straddling a disc on an axle side through a pair of pads. In a disc brake device for generating a braking force on the disc through the pad by supplying a pressure fluid to a cylinder mounted on the caliper body, a key portion of the pad is provided on the side of the caliper body. A pad mounting structure for attachment / detachment is provided by following along a key groove provided in a pad holding portion from a substantially vertical direction, the pad holding structure being swingably supported below the pad holding portion by a pin, and substantially in the disc axial direction. A latch that is biased by a spring to lock the key portion to support the pad, and by inserting the latch under the pad holding portion, A snap pin that restricts swinging of the latch in a direction in which the lock of the lid and the latch is released, and a connecting chain that is connected to the latch and that prevents the snap pin from coming off and is prevented from being lost. Characterize.

According to this structure, by the latch urged by a leaf spring in a direction different from the pad attaching / detaching direction,
It is possible to realize a structure in which the pad can be easily attached and detached. Then, it is possible to prevent the latch from being disengaged simply by inserting the snap pin below the pad holding portion. That is, in the replacement work of the pad, the snap pin is pulled out to release the locking disengagement prevention of the latch, and the latch is rotated against the leaf spring or the like in the state of being prepared for the pad to drop, so that the pad is removed. Can be securely removed.
Even when a new pad is attached, the latch is locked by the leaf spring or the like when the key portion of the pad is slid into the key groove of the pad holding portion and reaches a predetermined position. It can also be easily installed.
Further, since the latch and the snap pin are connected by the connecting chain, a structure for preventing the snap pin from coming off and preventing it from being lost can be easily realized. Therefore, without inadvertently dropping the pad, it is possible to easily perform the pad replacement work that can freely release the support of only the pad, and also the troublesome skill to prevent the bolt from loosening with the entanglement line. It is possible to provide a pad mounting structure for a disc brake device that does not require the required work.

According to a second aspect of the present invention, there is provided the pad mounting structure for a disc brake device according to the first aspect, wherein the connecting chain is hooked around a chain hook attached to a lower portion of the pad holding portion, so that the snap. It is characterized by pulling in the insertion direction of the pin to prevent it from coming off.

According to this structure, since the connecting chain is wound around the chain hook attached to the lower portion of the pad holding portion, the snap pin can be easily prevented from coming off.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a disc brake device 1 according to this embodiment, and FIG. 2 is a front view seen from the disc 2 side (disc 2 is omitted). 1 and 2, the disc brake device 1
Is attached to a bogie such as a railroad vehicle (not shown) by the supporting portions 3 and 4, and the caliper body 6 that constitutes the main body of the device 1 is attached to the axle 3 by the disc 2
Is attached so as to straddle the pair of pads 5 via the pad 5.

The caliper body 6 has a pair of lever mechanisms which are swingably supported by the support portion 4 by a support shaft 9 attached to the center portion thereof. A cylinder 7 to which a pressure fluid such as air pressure is supplied is provided at one end located, and a pad holding portion 8 holding a pad 5 is swingably supported by a spindle 10 at one end on the disk 2 side. It is installed. In addition,
The support portion 3 is swingably connected to the pad holding portion 8 to support the disc brake device 1.

The disc brake device 1 supplies compressed air or the like to the cylinder 7 to drive a piston (not shown) to operate the caliper body 6 so as to sandwich the disc 2 with the support shaft 9 as a fulcrum. 5 is pressed in the disc axial direction to generate a braking force on the disc 2.

The disc brake device 1 has a pad mounting structure in which the key portion 12 of the pad 5 is attached to and removed from the key groove 11 provided in the pad holding portion 8 from substantially vertically below. FIG. 3 is a view of the pad holding portion 8 as viewed from below, showing a main portion of the pad mounting structure. FIG. 4 is a perspective view of the pad 5, and FIG.
Shows a top view of the pad 5, and FIG. 5 (b) shows a sectional view taken along the line AA.

As well shown in FIGS. 4 and 5, the pad 5 is shaped so as to substantially follow a part of the circular arc of the disk 2, and the key portion 12 is provided on the side opposite to the surface in contact with the disk 2. have. The pad holding portion 8 is provided with a key groove 11 having a shape that substantially matches the outer shape of the key portion 12, and the key portion 12 is slidably fitted into the key groove 11 so that the pad 5 is a pad. It is attached to the holder 8 (see FIG. 3).

In such a pad mounting structure, a structure for supporting the pad 5 on the pad holding portion 8 is further provided below the pad holding portion 8. Hereinafter, this support structure will be described with reference to FIGS. 1 to 3. This support structure is swingably supported by a pin 13 below the pad holding portion, and is urged by a leaf spring 14 substantially in the axial direction of the disc 2 to lock with the key portion 12 to prevent the pad 5 from falling. Latch 15 and a snap pin 17 connected to the latch 15 by a connecting chain 16.

That is, the latch 15 is an elongated flat plate-shaped member arranged in a plane perpendicular to the disk 2, as is well understood in FIGS. 1 and 3, and one end thereof is shown in FIG. The supported portion 15a of the pin 13
It is pivotally supported by.

The end portion 15b located at the other end of the supported portion 15a has a size such that it partially projects from the pad holding portion 8. By pulling the protruding portion of the end portion 15b in the direction of the arrow (a) shown in FIG. 3, the engagement between the pad 5 and the latch 15 is released as described later.
In addition, a recess 15f is formed in the end portion 15b,
One end of a snap pin 17, which will be described later, is inserted into the recess 15f so as to fit therein.

The side portion of the latch 15 facing the pad 5 has a protrusion 1 having a shape that is substantially fitted into the key groove 11.
5c is formed. This protruding portion 15c is the key portion 1
By contacting the lower end surface of the pad 2, the pad 5 is prevented from dropping downward.

Further, a concave portion 15d and a tip support portion 15e of the leaf spring 14 are formed on the side portion opposite to the side portion on which the protrusion 15c is formed. The recess 15d serves to function as a space in which the leaf spring 14 bends and is stored when the latch 15 is swung. Tip support 15
Reference numeral e denotes a portion to which the biasing force of the leaf spring 14 to the latch 15 is directly transmitted, and the tip of the leaf spring 14 is held by a portion formed in a pocket shape so that the pad 5 is moved to the pad holding portion 8. The leaf spring 14 and the latch 15 are prevented from coming off even when they are not attached.

In FIG. 1 and FIG. 3, the leaf spring 14 is a substantially trapezoidal and flat plate-like elastic member, and is fixed to the pad holding portion 8 by the bolt 18 at one end where the width is widened. The flat plate portion on the other end side is attached so as to abut the side portion of the latch 15. As described above, the tip end portion of the leaf spring 14 is arranged to be inserted into the tip end support portion 15e of the latch 15, and the leaf spring 14 is housed in the recess 15d as the latch 15 swings. It bends to.

Next, the snap pin 17 will be described.
As can be seen from FIGS. 1 to 3, the snap pin 17 is formed by bending a single rigid wire rod into a coil shape about once and a half times to form a spring portion 17a, and then bending it into a wavy shape only on one end side. The curved portion 17b is formed. Also,
A straight portion 17c is provided on the other end side where the curved portion 17b is not formed. The snap pin 17 is inserted into the pad so that the linear portion 17c is inserted into the pin hole 19 provided in the lower portion of the pad holding portion 8 and the curved portion 17b is fitted into the groove portion 21 also provided in the lower portion of the pad holding portion 8. It is inserted into the holding portion 8. That is, the latch 15 is the pad 5
When the snap pin 17 is inserted into the pad holding portion 8 in a state in which the curved portion 17b and the linear portion 17 are locked.
The end portion 15b of the latch 15 is positioned so as to be sandwiched between it and c. At this time, the tip of the linear portion 17c is inserted so as to fit into the recess 15f provided in the end portion 15b. At the time of this insertion, the end portion 15b is positioned so as to fit into the recessed portion of the curved portion 17b, and the latch 1
The curved portion 17b is pressed toward the pad holding portion 8 side. In this way, the snap pin 17
Is inserted into the lower portion of the pad holding portion 8, the swing of the latch 15 in the direction in which the engagement between the pad 5 and the latch 15 is released is restricted, and the engagement is prevented from being released. .

The snap pin 17 described above is connected to the latch 15 by a connecting chain 16. That is,
One end of the connecting chain 16 is fixed by tying it to one location of the latch 15, and the other end is attached to the spring portion 17 a of the snap pin 17. Snap pin 1
The pad 7 needs to be inserted and removed every time the pad 5 is replaced, and is a small part, so that it is easy to lose it. However, by having the connecting chain 16, the loss prevention function can be easily realized. The connecting chain 16 is a flexible continuous body and may be any fiber as long as it is difficult to cut even after long-term use. It may be anything.

Further, a chain hook 20 projecting like a nail is attached to the lower portion of the pad holding portion 8. The chain hook 20 is arranged below the latch 15, and the connecting chain 16 connecting the snap pin 17 inserted into the pad holding portion 8 and the latch 15 is wound around the chain hook 20 about half a turn. It is something that is caught on. Thus connecting chain 1
6 is hung around the chain hook 20 so that the snap pin 1
It can be pulled out by pulling in the insertion direction of 7. When the connecting chain 16 is hooked on the chain hook 20, the snap pin 17 is once pushed down. That is, when the snap pin 17 is pushed in, the curved portion 17b is pushed by the end portion 15b of the latch 15 and the spring portion 17a is deformed, and the position of the snap pin 17 is lowered, so that the connecting chain 16 sags downward. Is used to hang the connecting chain 16 around the chain hook 20. Then, when the push-in of the snap pin 17 is released, the spring portion 17a elastically recovers,
The snap pin 17 will return to a predetermined position. The connecting chain 16 needs to be adjusted to an appropriate length that can exhibit the above-mentioned action.

The above is the structure of the pad mounting structure of the disc brake device 1. Next, the replacement work of the pad 5 in the pad mounting structure will be described with reference to FIGS. 1 to 3.

When the pad 5 is worn out due to use and needs to be replaced, the vehicle equipped with the disc brake device 1 is moved to a pit such as a maintenance base. Then, the worker enters the pit and works below the disc brake device 1. First, regarding the removal work of the pad 5, the operator puts a finger on the connecting chain 16 and the snap pin 1
7 is pushed downward and the connecting chain 16 is removed from the chain hook 20 to release the stopper. And snap pin 1
7 is pulled upward from the pad holding portion 8. This allows
The mechanism that prevents the key portion 12 of the pad 5 and the latch 15 from being disengaged is released. At this stage, the pad 5 is still locked by the latch 15, and the latch 15 is biased in the axial direction of the disk 2 by the leaf spring 14, so the locking is suddenly released and the pad 5 is accidentally dropped. There is nothing to come.

Now, hold one hand under the pad 5,
In preparation for the drop of the pad 5, the end 15 of the latch 15
3B, the latch 15 is pulled against the leaf spring 14 in the direction of the arrow (a) in FIG. 3 (the front direction in the latch 15 shown in FIG. 1). As a result, the lock between the key portion 12 of the pad 5 and the latch 15 is released, and the pad 5 drops and can be easily received by the hand held down. After this, the removal is completed by sliding the key portion 12 of the pad 5 into the key groove 11 of the pad holding portion and pulling out the pad 5 downward.

After taking out the worn pad, this time, a new pad is mounted. First, similarly to when the old pad is taken out, the end 15b of the latch 15 is put into the hand and the latch 15 is pulled in the direction (a) in FIG. And then
From the tip of the new pad 5 to the key groove 1 of the pad holder 8.
Insert the key part 12 so that it fits in 1. Key part 12
When the tip ends of are fitted into the key groove 11, the pad 5 is directly pointed above the pad holding portion 8 along the key slide with the hand released from the end portion 15b of the latch 15. At this time, the protrusion 15c of the latch 15 is
It is urged by 4 and pressed against the key portion 12. When the lower end of the key portion 12 is inserted, the protruding portion 1
5c is urged by the leaf spring 14 so as to jump out to the key groove 11, and the end surface of the lower end portion of the key portion 12 and the protruding portion 15c are locked. This prevents the pad 5 from falling.
It should be noted that the upper side of the key groove 11 is in contact with the key portion 12,
An upper end portion 22 that regulates the position of the pad 5 to the upper side is provided (see FIG. 1).

Further, in order to prevent the pad 5 and the latch 15 from being disengaged, the snap pin 17 is pointed. At this time, the snap pin 17 is engaged with the latch 1
5 is in a state of being hung down while being connected to the connecting chain 16 by the connecting chain 16, but the snap pin 17 is padded so that the linear portion 17c of the snap pin 17 fits into the pin hole 19 and the curved portion 17b fits into the groove portion 21. Insert into the holding portion 8. When the snap pin 17 is completely inserted, a finger is next put on the connecting chain 16, the snap pin 17 is slightly pushed in, and the snap pin 17 is pulled downward and hooked on the chain hook 20 protruding from the pad holding portion 8 below the latch 15. . This prevents the snap pin 17 from coming off. In this way, the pad 5 is replaced with respect to the disc brake device 1.

As described above, according to the pad mounting structure of the disc brake device according to the embodiment,
Achieves easy pad replacement work that can freely release the support of the pad without inadvertently dropping the pad, and also the troublesome and skilled work of locking the bolts with the entanglement line It is possible to provide a pad mounting structure for a disc brake device that does not require

The embodiment is not limited to the above, and the following modifications may be made, for example.

(1) In this embodiment, the shapes of the latch and the snap pin are specifically described, but the shape is not necessarily limited to this. That is, all modifications and applications that are conceived upon reading and understanding this specification, and equivalents thereof are intended to be included in the scope of the present invention.

(2) In the disc brake device according to this embodiment, the cylinder portion is provided at one end of the caliper body located on the side opposite to the disc, but the disc brake device has a cylinder on the disc side. However, the present invention can be applied.

(3) Regarding the connecting chain, one end is attached to the latch, but even if it is attached to the pad holding portion, the same effect as this embodiment can be obtained.

(4) In the present embodiment, the leaf spring urges the latch, but the present invention is not limited to the leaf spring, and the same effect can be obtained by other urging means. Is.

[0037]

According to the first aspect of the present invention, it is possible to realize a structure in which the pad can be easily attached and detached by the latch urged by a leaf spring in a direction different from the attaching and detaching direction of the pad. Then, it is possible to prevent the latch from being disengaged simply by inserting the snap pin below the pad holding portion. That is, in the replacement work of the pad,
The pad can be reliably removed by pulling out the snap pin, releasing the lock release prevention of the latch, and rotating the latch against a leaf spring or the like in preparation for the pad to drop. Even when a new pad is attached, the latch is locked by the leaf spring or the like when the key portion of the pad is slid into the key groove of the pad holding portion and reaches a predetermined position. It can also be easily installed. Further, since the latch and the snap pin are connected by the connecting chain, a structure for preventing the snap pin from coming off and preventing it from being lost can be easily realized. Therefore, without inadvertently dropping the pad, it is possible to easily perform the pad replacement work that can freely release the support of only the pad, and also the troublesome skill to prevent the bolt from loosening with the entanglement line. It is possible to provide a pad mounting structure for a disc brake device that does not require the required work.

According to the second aspect of the present invention, it is possible to easily prevent the snap pin from coming off by having the structure in which the chain is attached to the chain attached to the lower portion of the pad holding portion.

[Brief description of drawings]

FIG. 1 is a side view showing a disc brake device according to an embodiment of the present invention.

FIG. 2 is a front view showing a disc brake device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a main part of a pad mounting structure of the disc brake device according to the embodiment of the present invention.

FIG. 4 is a perspective view of a pad of the disc brake device according to the embodiment of the present invention.

FIG. 5 is a top view and a cross-sectional view of a pad of the disc brake device according to the embodiment of the present invention.

FIG. 6 is a diagram showing a disc brake device according to a conventional technique.

[Explanation of symbols]

1 Disc brake device 2 discs 5 pads 6 caliper body 7 cylinders 8 Pad holding part 11 keyway 12 key part 13 pin 14 leaf spring 15 Latch 16 connecting chain 17 snap pin 20 chains

Claims (2)

[Claims] 1. A caliper body mounted on a bogie of a vehicle and straddling a disk on an axle side via a pair of pads, and a pressure fluid is supplied to a cylinder mounted on the caliper body, so that the pads are passed through the pads. In a disc brake device that generates a braking force on the disc, the pad is attached and detached by arranging the key portion of the pad along a key groove provided in a pad holding portion on the side of the caliper body from substantially vertically below. A structure, which is swingably supported by a pin below the pad holder,
A latch that is biased by a spring in a substantially disc axial direction to support the pad by locking with the key portion, and a direction in which the pad and the latch are unlocked by being inserted into a lower portion of the pad holding portion. 2. A pad mounting structure for a disc brake device, comprising: a snap pin that restricts swinging of the latch; and a connecting chain that is connected to the latch and that prevents the snap pin from coming off and is prevented from being lost. 2. The connection chain is stretched around a chain hook attached to a lower portion of the pad holding portion so as to pull in the insertion direction of the snap pin to prevent the connection chain from coming off. The pad mounting structure for the disc brake device according to claim 1.