MXPA02007273A

MXPA02007273A - Railway truck with equalizer beam mounted disc brake caliper.

Info

Publication number: MXPA02007273A
Application number: MXPA02007273A
Authority: MX
Inventors: Richard B Polley
Original assignee: Buckeye Steel Castings Co
Priority date: 2000-01-31
Filing date: 2001-01-31
Publication date: 2003-02-12
Also published as: WO2001054957A1; CN1396874A; EP1252052A4; AU3125201A; EP1252052A1; CA2398646A1

Abstract

A disc brake assembly for a railway truck is provided. The truck (10, 11) includes at least two wheel axle sets (22, 23) and brake discs (12, 13) mounted to the wheel axle sets (22, 23). Extending between the wheel axle sets (22, 23) is a longitudinally extending truck frame (20, 21). Also extending between the wheel axle sets (22, 23) and supporting the truck frame (20, 21) via primary springs (65) are equalizer beams (64) that further extend beyond the wheel sets (22, 23) and through an opening (70) in the truck frame (20, 21). Disc brake calipers (62) are mounted to the equalizer beams (64) with the caliper (62) engaging the brake discs (12, 13) of the wheel sets (22, 23). The assembly results in the brake discs (12, 13) and calipers (62) being unsprung. In other words, the brake discs (12, 13) and calipers (62) do not move relative to each other.

Description

- TRACMN3R RAILWAY WITH DISC BRAKE CALIBRATOR MOUNTED IN THE EQUALIZER ARM FIELD OF THE INVENTION The present invention relates generally to improved brake assemblies for tractors for railway freight cars. More specifically, but without restriction to the particular use that is shown and described, this invention relates to the improved assembly of disc brake assemblies to the tractor for freight cars.

BACKGROUND OF THE INVENTION It is well known in the art to use disc brake assemblies as the braking mechanism for rail tractors, including tractors for passenger and freight cars. It is also known in the art that disc brake assemblies include brake discs, disc brake calipers, and brake pads. During use, brake discs are typically mounted on the tractor's wheel axle assembly, either directly to the axle or through the wheel. In any type of mounting, the brake discs are not damped. That is, the brake discs do not move relative to the wheel axle assembly. Disc brake calipers are mounted conventionally on the tractor chassis and are releasably attached to the brake discs. The brake pads are attached to the disc brake calipers which, during operation, engage with the brake discs to provide a braking force to the wheels. Tractors for passenger and cargo wagons have a primary suspension between the wheel axle assembly and the tractor chassis that allows relative vertical movement between the wheel axle assembly and the tractor chassis and the brake calipers. accompanying disc. Therefore, the disc brake calipers are damped relative to the wheel axle assembly and the brake discs. In tractors for passenger cars, this relative movement between cushioned brake calipers and undamped brake discs has been limited by several factors ae design: the loaded weight ratio is small in passenger tractors to reduce deflections due to static charge change; the disk brake calipers 5 have conventionally been located longitudinally within the shaft, thereby limiting the deflection due to pitching of the tractor chassis; and a secondary suspension has been placed between the tractor chassis and the head for 10 absorb most of the vertical deflection of the suspension, thereby allowing the primary suspension to be more rigid. Together, these design factors for passenger car tractor have a primary spring deflection 15 which is sufficient to accommodate the cushioned brake calipers and the undamped brake discs and has not resulted in the problems encountered in tractors for freight cars, discussed below. As indicated above, when a load tractor chassis is mounted on a primary suspension, such as a primary spring, the disk brake caliper is damped relative to the brake discs. During the 25 operation of the loading wagon, assembly The deadening of the caliper has resulted in an undesirable amount of relative vertical movement between the undamped brake disc and the damped brake caliper due to various conditions, such as the load to be carried, the dynamic bounce and the pitching of the chassis of the tractor. This undesirable relative vertical movement is amplified during high-speed operation of the freight cars, which use softer primary springs to ensure safe operation and acceptable travel quality over existing roads. The use of softer springs causes large spring deflections, which has been shown to cause two common problems. First, brake pads, which are part of the caliper assembly, can be partially ejected from the disk, which reduces braking efficiency. Second, the reaction forces of the brake pads are transmitted through the brake caliper assembly to the tractor chassis. These reaction forces result in a pitch movement in the tractor chassis, which can discharge the individual primary springs. When the pitch of the tractor chassis is severe, the individual springs can be completely discharged, creating the possibility that the springs will not settle or that the springs become loose from the tractor assembly. The present invention overcomes the aforementioned problems of excessive movement between the brake disc and the gauge, and the potential discharge of the springs.

BRIEF DESCRIPTION OF THE INVENTION The present invention is directed to eliminate the known problems associated with the relative movement between the brake disc and the gauge due to the loading conditions and other dynamic forces that develop during the high-speed operation of the loading car. The invention achieves these objectives by providing a disc brake assembly in which the brake caliper is mounted on the equalizing arm, which is not damped relative to the wheel assembly. With this construction, both the brake disc and the brake caliper are non-damped elements, and are not damped one relative to the other. Because these elements are not damped, the relative displacement between the brake disc and the caliper caused by load variation, dynamic rebound and braking induced pitch is essentially eliminated. In addition, the possibility of unloading the primary spring is also eliminated BRIEF DESCRIPTION OF THE FIGURES The present invention will be described with reference to the accompanying drawings. In the drawings, the following figures have the following general nature: Figure 1 is a partial side view of a tractor assembly of the prior art. Figure 2 is a partial top view of the prior art tractor assembly of Figure 1. Figure 3 is a partial side view of another prior art tractor assembly. Figure 4 is a partial top view of the prior art tractor assembly of Figure 3.

Figure 5 is a partial side view of the tractor assembly of the present invention. Fig. 6 is a partial top view of the invention of Fig. 5. Fig. 7 is an isometric view of a pair of equalizer arms of the present invention connected to a pair of disc brake mounting arms.

DETAILED DESCRIPTION OF THE INVENTION Referring to the figures in which like numerals indicate like elements, it is shown in Figures 1-4 prior art tractor assemblies which illustrate the damped mounting of a disc brake caliper relative to the brake disc. As illustrated, the tractor assemblies 10 and 11, as shown in FIGS. 1 and 3, respectively, include the brake discs 12 and 13 for the tractor, which are mounted on the shaft assembly, either directly to the tractor. axis 14, as shown in figures 1 and 2, or through wheel 16, as shown in figures 3 and 4. In any type of mounting, the brake discs do not they are cushioned and therefore do not move relative to the wheel assembly. The tractor assemblies also include disc brake calipers 18 and 19 which are mounted to the tractor chassis 20 and 21. The tractor chassis, in turn, is mounted to the axle assembly of wheels 22 and 23 by a suspension primary. With this arrangement, the disc brake calipers are not damped, or move vertically relative to the wheel assembly during operation. It has been shown that, during operation, these prior art assemblies, in which the gauge is damped relative to the discs, have resulted in an undesirable relative vertical movement between the undamped disc and the cushioned gauge due to loading conditions, dynamic bounce and pitching of the tractor chassis. In some cases, for tractor assemblies using soft primary springs, the relative vertical movement may be such that the brake linings partially come out of the disc, thereby reducing braking efficiency, and may be so severe that springs can seat or fall off the tractor assembly. Referring to Figures 5 and 6, the present invention is shown and overcomes the problems of relative movement between the brake disk and the gauge. As shown in an exemplary embodiment, the present invention includes the tractor assembly 40, which incorporates the disc brake assembly of the invention, described below. The tractor assembly 40 also includes the wheel axle assemblies 42, which comprise the flanked railway wheels 44, spaced transversely from one another, and joined by a transversely extending axle 46. In the wheels 44 are mounted brake discs 48. Those skilled in the art should understand that the present invention can be used with brake discs mounted on wheels or axles. The chassis of the tractor 50 is supported on the wheel assemblies through the equalizing arms 64 and the primary springs 65. As is conventional, the tractor frame 50 extends longitudinally and defines, longitudinally separated, the jaws of the tractor 50. opening pedestal 52 in descending order. Pedestal jaws define a pedestal leg 54 and an exterior pedestal leg 56. Mounted between the inner and outer pedestal legs, within the opening of the pedestal jaws, are the axle boxes 58 which rotatably receive the axes 46 through the journals. The axle boxes 58 are retained between the inner and outer pedestal legs by the clamping bars 60. The tractor 40 also comprises a disc brake caliper 62, which is mounted to an equalizing arm 64 by a mounting bracket 66. It will be understood by those skilled in the art that the mounting of the disc brake caliper 62 by the mounting bracket 66 can be achieved using numerous methods of attachment, including the use of bolts, tapes, welding or other appropriate methods. The brake pads 68 are attached to the brake caliper disk 62, which, during operation, engage the brake discs 48 of the wagon wheels. In an exemplary embodiment, the equalizing arm 64 extends between the sets of wheels and longitudinally behind the axle boxes through a central opening or hole 70 in the outer pedestal leg 56 of the jaw of pedestal 52. Those skilled in the art should understand that other designs of the equalizing arm are possible. The removable filler blocks 72 are located on all four internal pedestal legs to allow assembly and / or disassembly of the extended equalizer arm 64. In tractor designs with a single equalizing arm, the equalizing arms extend longitudinally between the axle boxes and are located transverse to the center lines of the bearing passing between the inner and outer faces of the internal pedestal legs , one on each side of the tractor. The filling blocks 72 are removable solid blocks that are secured between the inner and outer faces of a split pedestal leg, after the equalizer arm is installed, to structurally replace the material removed from the divided pedestal leg to allow the assembly / disassembly of the equalizing arm in the tractor chassis. Typically, filler blocks are required at the end of each tractor chassis and secured by tapes on threaded fasteners. Due to the extended length of the equalizing arm, the filling blocks for mounting the disc brake calipers in the present invention are required on all four inner pedestal legs to facilitate the installation and removal of the equalizing arms. Referring to Figure 7, an alternative embodiment of the invention includes the use of arms for mounting disc brakes 80 which are connected to, and opposing transversely to the equalizing arms 64 to provide an alternative mounting arrangement for disc brake calipers. The disc brake mounting arm, at its end, is pivotally mounted to a corresponding end of the equalizing arm 64. Assembly can be accomplished by the use of elastomeric bushings 82 or other similar mounting methods that allow the Limited relative angular movement of the equalizing arms on opposite sides of the tractor. With this construction, calipers for disc brakes can be mounted to the arm for mounting disc brakes 80. Significantly, as they are assembled, the disc and brake caliper, and The accompanying balatas are non-damped elements. This unique assembly eliminates significantly, if not completely, the relative displacement between the disc and brake caliper due to load variation, dynamic bounce and pitching induced by braking. In addition, the possibility of unloading the primary spring is eliminated. It should be understood that variations in the modalities are possible without being outside the scope of the present invention. Therefore, to indicate in a particular way and to claim in a distinctive way the matter considered as the invention, the following claims conclude the specification.

Claims

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and therefore the content of the following is claimed as property: CLAIMS

1. - A tractor assembly for railway wagon comprising: at least two axes longitudinally separated, extending transversely, wheels mounted to the axles, brake discs mounted to the wheels, tractor chassis that extend longitudinally separated in shape cross section that define pedestal jaws that extend in a descending manner which are mounted to axle boxes that are mounted on the axles, a pair of equalizer arms mounted on opposite sides of the tractor assembly and extending longitudinally further beyond the axle boxes and through an opening in the pedestal clamp, at least one arm for assembly of disc brakes that extend between the pair of equalizer arms, a caliper assembly for disc brakes mounted on the equalizing arm, the caliper assembly for disc brakes includes a caliper that engages with the brake discs of the wheels, blocks of filling mounted on the pedestal legs of the pedestal jaws, characterized in that the brake discs and the caliper are not damped one relative to the other.

2. - The rail car tractor assembly according to claim 1, further characterized in that it comprises a mounting bracket, the caliper assembly for disc brakes being mounted on the bracket for mont aj e.

3. - The rail car tractor assembly according to claim 2, further characterized in that two arms for mounting disc brakes extend between the pair of equalizer arms.

4. - A rail car tractor assembly having at least two sets of wheels, brake discs mounted to the wheel assemblies, longitudinally extending and transversely extending tractor chassis mounted to the wheel assemblies, Tractor chassis define an indoor and outdoor pedestal legs, at least one or the equalizer arms is extended between the sets of wheels and longitudinally beyond the sets of wheels and through a central holes in the outer pedestal leg of the chassis of the tractor, and a caliper for disc brakes mounted on the equalizer arm, the caliper engages the brake discs of the wheel assemblies, characterized in that the brake discs and the caliper do not move relative to each other.

5. - The rail car tractor assembly according to claim 4, further characterized in that it also comprises a mounting bracket, the caliper for disc brakes being mounted on the mounting bracket.

6. - The rail car tractor assembly according to claim 5, further characterized in that two equalizer arms are mounted on the opposite sides of the vehicle. ? > > tractor assembly

7. - The rail car tractor assembly according to claim 6, further comprising a disc brake mounting arm extending between the two equalizer arms, further characterized in that the disc brake caliper is mounted on the arm for mounting disc brakes.

8. - The rail car tractor assembly according to claim 6, further characterized in that it also comprises two arms for mounting disc brakes that extend between the two equalizer arms.

9. - The rail car tractor assembly according to claim 6, further characterized in that it also comprises 0 padding blocks mounted on the tractor chassis.

10. A railroad tractor assembly comprising: at least two sets of wheels, brake discs mounted on the wheel assemblies, a tractor chassis mounted to the wheel assemblies, defining the chassis of the tractor an opening, * 5 * • tt- a pair of equalizer arms mounted on opposite sides of the tractor assembly and extending longitudinally beyond the wheel assemblies and through the opening in the tractor chassis, at least a filling block located within the opening in the tractor chassis, and a brake caliper for disc brakes mounted on the equalizing arm, the brake caliper for disc brakes engages the brake discs, characterized because the brake discs and the caliper do not they are cushioned one in relation to the other.

11. The rail car tractor assembly according to claim 10, further characterized in that it also comprises a bracket for mounting, the caliper for disc brakes being mounted on the mounting bracket.

12. - The rail car tractor assembly according to claim 11, further characterized in that it also comprises an arm for mounting disc brakes that extends between the two equalizer arms. A disc brake assembly for rail tractor is provided. The tractor (10, 11) includes at least two sets of wheel axles (22, 23) and the brake discs (12, 13) mounted on the wheel axle assemblies (22, 23). Extending between the wheel axle assemblies (22, 23) is a longitudinally extending tractor frame (20, 21). Also, extending between the sets of wheel axles (22, 23) and supporting the tractor chassis (20, 21) by means of the primary springs (65) are the equalizing arms (64) which also extend beyond the wheel assemblies (22, 23) and through an opening (70) in the tractor chassis (20, 21) . Calipers for disc brakes (62) are mounted on the equalizer arms (64) with the caliper (62) engaging the brake discs (12, 13) of the wheel assemblies (22, 23). The assembly results in the brake discs (12, 3) and the calipers (62) not being damped. In other words, the brake discs (12, 13) and the calipers (62) do not move relative to each other. PA / a / 2002 \? 3