JPS6355466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic brake shoe clearance adjustment device in a pair of basic brake devices installed between front and rear wheels.

As railway vehicles become more sophisticated, the number of on-board devices has increased, and as a result, it has become necessary to make the on-board devices smaller and lighter.The basic brake system has also been replaced by a small unit brake system, a pack brake, in place of the conventional bogie brake system. devices have come into use. A pack brake system connects a brake lever to each brake shoe installed on the front and rear wheels of a vehicle, and operates each brake lever while supporting the lower end of each brake lever in a fixed position. This type is driven separately by a brake diaphragm, and the braking force generated by the brake diaphragm is transmitted to the brake shoes. In this type of brake system, the gap between the wheel and the brake shoe (hereinafter referred to as the brake shoe gap) changes depending on the wear of the brake shoe, as in the bogie brake device.
It is necessary to compensate for fluctuations in brake stroke and keep the brake stroke constant.

When applying the automatic brake pad clearance adjustment mechanism to a pack brake device, the push rod that supports the lower end of each brake lever is attached to the brake rod, a threaded cylinder screwed onto the brake rod, and an exterior of the screw cylinder. The brake mentioned above.
A feeding mechanism for the threaded barrel that automatically feeds the threaded barrel in response to wear of the brake shoe and sequentially feeds out the threaded barrel from the brake rod to extend the entire length of the push rod. However, since the operation of the pair of brake devices is performed separately, conventionally, the push rods of each pack brake device, specifically the brake rods, were supported separately on the underframe of the vehicle.

For this reason, all the reaction force when tightening the brakes is applied to the underframe, requiring a robust support structure to support the brake rods, making the device larger and unavoidably increasing its weight.

The present invention solves the above problems, and consists of a brake diaphragm, a brake shoe held on the underframe of the vehicle body by a brake shoe suspension, and a brake that transmits the braking force generated in the brake diaphragm to the brake shoe.
A pair of basic brake devices for a railway vehicle are installed between the front and rear wheels of the vehicle, each of which includes a push rod that supports the lower end of the brake lever, and an automatic brake shoe gap adjustment mechanism assembled to the push rod; The push rod is composed of a brake rod, a threaded cylinder screwed onto the brake rod, and an outer cylinder mounted on the threaded cylinder and connected to a brake lever, and the brake rods of both push rods are arranged on the same shaft. These brake rods are arranged on a line to prevent axial movement, and are inserted from both ends into a single connecting cylinder, and the ends of both brake rods are butted against each other in the connecting cylinder. The adjustment mechanism is provided with a working screw loosely fitted in the threaded cylinder within the outer cylinder, a driving clutch interlocked with the working screw, and serrated teeth that mesh with the serrated teeth of the driving clutch, and spline-coupled to the screw cylinder. A return spring that biases both clutches in the meshing direction, a feed screw screwed onto a rough lead screw that does not satisfy the self-support condition attached to the outer periphery of the operating screw, and a driven clutch. an action spring that presses against the inner end of the outer cylinder and urges the feed screw in one direction; a set screw that is implanted in the feed screw and projects outward through a long groove opened in the outer cylinder; and the outer cylinder. and a connecting plate having one end supported by the set screw via a spherical bearing and the other end connected to the brake shoe suspension. Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the basic brake system (pack brake system) PB installed on a vehicle. That is, the brake lever 2 is connected to the rod 1a of the brake diaphragm 1, and the brake lever 2 is connected to the rod 1a of the brake diaphragm 1.
A brake shoe 4 held on the underframe of the truck is connected by a brake shoe suspension 3. W is a wheel. Also,
The lower end of the brake lever 2 is supported by a push rod 6, and a brake shoe clearance automatic adjustment mechanism (hereinafter referred to as an adjuster) 7 is assembled to this push rod 6. This adjuster 7 controls the brake shoe suspension 3 that occurs when the brake is tightened and released.
The rotational movement of the push rod 6 is used to extend the entire length of the push rod 6 while automatically compensating for variations in the brake shoe clearance due to brake shoe wear. The basic brake device PB is
Push rods 6, 6, which are separately provided corresponding to the front and rear wheels W, W of the vehicle and support the brake levers 2, 2 of both brake devices PB, PB, are arranged on the same axis with their ends facing each other. has been done.

The present invention provides brake levers 2, 2 of both brake devices.
Insert the terminals of the push rods 6, 6 that support the
By abutting the ends of the push rods, the reaction force during braking is absorbed between both push rods, and the adjuster 7 has been improved to suit the above configuration. Since both basic brake devices PB, PB have the same structure,
Hereinafter, only one brake device will be described, and the same components will be given the same numbers and the description of the other brake device will be omitted. That is, the second
In FIG. 3, the push rod 6 is a brake rod 9,
A threaded tube 1 screwed onto a thread on the circumferential surface of the brake rod 9
0, and an outer cylinder 11 that is externally mounted on the threaded cylinder 10. One end of the threaded cylinder 10 inserted into the outer cylinder 11 through the opening edge is supported by a bearing part 12 formed at the inner end of the outer cylinder 11, and the opening edge of the outer cylinder 11 is screwed to the inner peripheral surface thereof. It is supported on the periphery of the body of the threaded barrel 10 via a threaded barrel support 13 .
The outer cylinder 11 has a two-pronged portion 11a at its tip, and this two-pronged portion 11a is connected to the brake via a pin P.
The end of the brake rod 9 is inserted into the connecting cylinder 8, and is butted against the end of the brake rod 9 in the other basic brake device PB within the connecting cylinder 8. . The details will be described later.

The regulator 7 assembled to the push rod 6 is as follows. That is, the threaded cylinder 10 inside the outer cylinder 11
An annular stopper having one end protruding from the circumference of the threaded cylinder 10 is loosely fitted with a working screw 14 having a feed screw with a rough lead that does not satisfy the thread self-sustaining condition (wear angle>lead angle) on the circumference of the threaded cylinder 10. 15, and a spline-shaped "two 16" is provided at the other end, and this is attached to the threaded cylinder 1.
It is engaged with the inner diameter spline portion 18 of the housewife clutch 17 which is loosely engaged at zero.

Note that the stopper 15 also serves as a stopper for the screw cylinder receiver 13.

A driven clutch 19 is connected to the circumference of the threaded cylinder 10 by a spline, and the spring pressure of a return spring 20 interposed between the operating screw 14 and the driving clutch 17 is applied to the driving clutch 17 to release both clutches. The tooth patterns provided on the end faces are brought into pressure contact with each other.

FIG. 4 shows the shapes of the tooth patterns 17a and 19a of the clutch. That is, the tooth shapes 17a and 19a are made of serrated teeth, and rotate idly when rotated in one direction (brake tightening direction), and rotate in the opposite direction (brake release direction).
When the rotation angle when the brake is tightened exceeds one angle with respect to the rotation of On the other hand, a feed screw 21 is attached to the inner diameter of the working screw 14 with a rough lead screw that engages with a screw attached to the outer peripheral surface of the working screw 14. Set screws 22 are implanted on both sides of the feed screw 21. , outer cylinder 11
The outer cylinder 11 is protruded from the circumference of the outer cylinder 11 through a long groove 23 that is opened on both sides along the axial direction of the outer cylinder 11 . Feed screw 2
1 is screwed into the rough thread of the lead of the working screw 14, so when a thrust is applied to the feed screw 21 in the axial direction of the working screw 14, the working screw 14 rotates and moves freely. In order to maintain this feed screw 21 in a fixed position at all times, an action spring 25 is interposed between the feed screw 21 and the flange of the driven clutch 19 to which the action spring receiver 24 is applied, and the spring force is applied to the feed screw 21. This acts to bias it in one direction and press it against the stopper 15. The driven clutch 19 is pressed against the inner end surface of the outer cylinder 11 under the back pressure of the operating spring 25, and a friction plate 26 made of urethane or the like with a large friction coefficient is attached to the rear surface of the driven clutch 19.
is attached to form a friction clutch between the inner end surface of the outer cylinder 11 and the friction plate 26, and the frictional force therebetween prevents the threaded cylinder 10 from turning freely due to vibrations of the vehicle or the like.

A pair of setscrews 22 protruding outward from the long grooves 23 of the outer cylinder 11 are supported by an actuating cylinder 27 that is slidably mounted on the circumference of the outer cylinder 11 in the axial direction, and A connecting plate 29 is supported on the circumference of the set screw 22 via a spherical bearing 28, and each connecting plate 29 is extended parallel to the axis of the push rod 6, and its two-pronged portion 29a is attached to the lower end of the brake shoe suspension 3. Connect to.

The support structure of the push rod 6 equipped with the adjuster 7 is as follows. That is, the brake rod receiver 30 is screwed to the end of the brake rod 9 protruding from the other end of the threaded tube 10, and the screw tube receiver 32 is inserted into the cylindrical portion 30a that is integrated with the brake rod receiver 30. The inner peripheral surface covers a part of the peripheral surface of the threaded cylinder 10, and the cylindrical part 3
A hexagonal part 31 for restoring operation is provided at the terminal 0a.
Furthermore, screw the threaded tube receiver 33 that is mounted on the threaded barrel 10 onto the opening edge of the threaded barrel receiver 32, and screw the brake rod receiver 34 that is mounted on the threaded barrel receiver 32 onto the opening edge of the cylindrical portion 30a. Then hold them concentrically. This threaded cylinder receiver 32 is the brake rod 9
This serves to prevent the screw tube 10 from combing and breaking, and to serve as a dust cover. Brake rod 9 like this
The brake rod holder 30, which is coupled to and mounted on a part of the circumferential surface of the threaded cylinder 10, is inserted into the connecting cylinder 8 from one opening edge, and similarly, the push rod in the other basic brake device is inserted from the other opening edge. 6, and connect the end surfaces of the brake rods 9, 9 of both push rods 6, 6 to the connecting tube 8.
Match inside. Note that an annular groove is provided at a corresponding location between the outer surface of the brake rod receiver 30 and the inner surface of the connecting cylinder 8, and a large number of connecting rollers 35 are inserted between both annular grooves to prevent leakage from inside the connecting cylinder 8. Brake rod holder 3
This prevents the brake rod receiver 30 from escaping and rotatably holds the brake rod receiver 30 within the connecting cylinder 8. The restoring operation hexagonal part 31 is provided adjacent to the opening edge of the connecting cylinder 8, and by rotating the hexagonal part 31, the brake rod 9 can be freely rotated through the brake rod receiver 30. Connecting tube 8
A bracket 36 is attached on the circumference of the bracket 36 corresponding to each hexagonal part 31, 31.
6, a two-pronged clamp 37 that is locked to the opposite sides of the hexagonal part 31 is pivotably supported as shown in FIG. 5, and the clamp 37 is normally locked to the hexagonal part 31 to prevent rotation apply.

The connecting tube 8 is fixed to a two-pronged support 39 attached to a connecting beam 38 extending toward the basic brake device for the other wheel, and a stop rod 40 hanging from the underframe is connected to the two prongs of the support 39. This prevents the connecting cylinder 8 from moving in the axial direction, and allows it to follow vibrations in the vertical direction.

In the embodiment, when the brake lever 2 is angularly displaced about the pivot point P of the push rod 6 by driving the brake diaphragm 1, the brake shoe 4 is displaced in the same direction and presses against the wheel W, and the brake is activated. Can be applied. At the same time, the movement of the brake lever 2 displaces the brake shoe suspension 3 in the same direction, pulling the connecting plate 29, pulling the actuating cylinder 27 in the same direction, and causing the set screw 22 and feed screw 21 to act. While compressing the spring 25, they integrally move in the same direction. The action screw 14 rotates counterclockwise in response to the linear movement of the feed screw 21, and is connected to a driving clutch 17 connected by a spline-like "shape 16".
also rotate in the same direction. (The direction of rotation is shown by the solid line arrow in Fig. 4.) Here, when the brake shoe clearance is S, the operating cylinder 27 has a lever ratio of S (=RS).
(R: constant), the driving clutch 17 rotates by an angle θ determined by the lead of the feed screw 21. If the allowable limit of the brake shoe clearance is S ₀ , one tooth (1/
The rotation angle of N) is the angle θ ₀ caused by the stroke of S ₀ . Therefore, when the variation in the brake shoe clearance due to wear of the brake shoe 4 is within the allowable range, that is, S
<S ₀ , the rotation angle of the driving clutch 17 is
Since θ<θ ₀ , when the brake is tightened, the teeth 17a of the driving clutch 17 are the teeth 19 of the driven clutch 19.
When the feed screw 21 retreats under the back pressure of the action spring 25 when the brake is released, the tooth 17a reverses and slides on the slope of the tooth 19a. No rotational force is transmitted to the driven clutch 19 only by descending and returning.

When the wear of the brake shoe 4 increases and S>S ₀ , θ
> θ ₀ , and when the brake is tightened, the active clutch 17
The rotation angle of the tooth 17a exceeds one tooth of the driven clutch 19, and falls into the next tooth valley under the back pressure of the return spring 20. When the brake is next released in this state, the feed screw 21 receives the return force of the action spring 25.
returns and rotates the working screw 14. The teeth 17a, 19a of both clutches rotate integrally in the direction shown by the dashed arrow in FIG.
is transmitted, and the threaded cylinder 10 rotates clockwise.
When the threaded cylinder 10 rotates clockwise, the brake rod 9 is prevented from rotating, so the threaded cylinder 1 rotates clockwise.
0 is fed out from the brake rod 9, and the outer cylinder 11 is also pushed out and moved forward, bringing the position of the pin P closer to the wheel W side. As the push rod 6 extends, the connecting plate 29 also moves together, and the brake lever suspension 3 is moved to the brake lever 4.
The brake shoe clearance is returned to below S ₀ by following the displacement of . Thereafter, whenever the brake shoes wear and the brake shoe clearance increases by a certain amount, the brake shoe clearance is automatically adjusted, and the brake stroke is always kept almost constant. The driven clutch 19 always receives back pressure from the operating spring 25, and a friction plate 26 provided on the back side of the driven clutch 19 is pressed against the outer cylinder 1.
1 to form a retaining clutch between them, and the threaded tube 10 is always subjected to the frictional restraining force of this retaining clutch so that it does not rotate freely due to vibrations while the vehicle is running, and the brake shoe When adjusting the gap, the threaded cylinder 10 rotates by overcoming this frictional restraint force.

In the present invention, when tightening the brake, the brake shoe 4
Of course, the reaction force applied to the brake rod 9 is transmitted to the brake rod 9, but since the brake rod 9 butts against the brake rod 9 of another basic brake device in the connecting tube 8, The reaction force is absorbed by the pawl and is not transmitted to the underframe. In addition, when tightening or releasing the brake, use the brake lever 2.
Although there is a slight deviation in the lower end position of the brake shoe suspension 3, this deviation is absorbed by the spherical bearing 28,
Push rod 6 generated by arc movement of brake lever 2
The vertical deviation of is absorbed by the gap between the stopper rod 40 and the support body 39.

Next, when the wear of the brake shoe reaches its limit and you want to replace it with a new brake shoe, remove the clamp 37 from the hexagonal part 31, fit a hand tool such as a spanner into the hexagonal part 31, and use the hand tool to operate the hexagonal brake shoe. Rotate the part 31 clockwise together with the brake rod 9 to remove the threaded tube 1.
0 is retracted, the entire length of the push rod 6 is shortened, and the brake shoe 4 is sufficiently separated from the wheel W, and the brake shoe is replaced. The above operation is exactly the same for other basic brake devices.

As described above, in the present invention, the connecting plate is supported by the set screw in the clearance adjuster of each brake device via the spherical bearing, so that the vibration of the brake shoe that occurs when tightening and releasing the brake is absorbed by the spherical bearing, and the push rod is absorbed by the spherical bearing. Therefore, the push rods of both brake devices are kept on the same axis, and the brake rods that make up each push rod are inserted into a single connecting cylinder from both ends.
By butting the ends of both brake rods together in the connecting cylinder, the pair of push rods can be essentially integrated into a single push rod, and there is no need for a strong support structure like in the past to support the push rods.
This has the effect of simplifying the support structure of the brake device and reducing its weight.

[Brief explanation of the drawing]

Fig. 1 is a side view of a basic brake device showing one embodiment of the device of the present invention, Fig. 2 is an enlarged partially sectional plan view of the push rod, Fig. 3 is an enlarged partially sectional side view of the push rod, and Fig. 4 is FIG. 5 is a developed view showing the tooth profiles of the driving clutch and the driven clutch, and FIG. 5 is an enlarged cross-sectional view taken along the - line in FIG. 3. 1...Diaphragm, 2...Brake lever, 4
... Brake shoe, 6... Push rod, 7... Brake shoe clearance automatic adjustment mechanism, 8... Connection cylinder, 9... Brake rod, 1
0...Threaded cylinder, 11...Outer cylinder, 14...Working screw, 17...Driver clutch, 17a...Tooth shape of drive clutch, 18...Spline, 19...Driver clutch, 19a...Driver clutch Tooth mold, 20
... Return spring, 21 ... Feed screw, 22 ... Set screw, 23 ... Long groove, 25 ... Action spring, 27 ...
... Working cylinder, 28 ... Spherical bearing, 29 ... Connection plate,
PB...Basic brake device, W...Wheel.

Claims (1)

[Scope of Claims] 1. A brake diaphragm, a brake shoe held on the underframe of a vehicle body by a brake shoe suspension, a brake lever that transmits the braking force generated in the brake diaphragm to the brake shoe, and a brake. A pair of basic brake devices for railway vehicles is installed between the front and rear wheels of the vehicle, and includes a push rod that supports the lower end of the lever, and an automatic brake gap adjustment mechanism assembled to the push rod, and the push rod is used as a brake. A rod, a threaded tube screwed onto the brake rod, and a brake mounted externally on the screw tube.
The brake rods of both push rods are arranged on the same axis to prevent them from moving in the axial direction. When the brake rods are inserted, the ends of both brake rods are brought into contact with each other in the connecting cylinder, and the automatic brake plate clearance adjustment mechanism is loosely fitted into the threaded cylinder within the outer cylinder, and the actuating screw is interlocked with the working screw. It has serrations that mesh with the serrations of the drive clutch,
A driven clutch spline-coupled to the threaded cylinder, a return spring that biases both clutches in the meshing direction, and a feed thread screwed onto a rough lead screw attached to the outer periphery of the working screw where the self-supporting condition is not met. A screw, an action spring that presses the driven clutch against the inner end of the outer cylinder and urges the feed screw in one direction, and a stop that is implanted in the feed screw and projects outward through a long groove opened in the outer cylinder. A screw, an operating cylinder that supports a set screw on the outer periphery of the outer cylinder, and a connecting plate whose one end is supported by the set screw via a spherical bearing and whose other end is connected to the brake shoe suspension. Automatic brake shoe clearance adjustment device for basic brake equipment for railway vehicles.