Telescopic pull rod of brake beam

Abstract

The invention discloses a telescopic pull rod of a brake beam, and relates to the technical field of railway equipment. The central connecting rod is arranged in the shell in a penetrating manner; the two connectors are symmetrically connected to the two ends of the center connecting rod and used for being connected with the brake beam telescopic pull rods on the two sides respectively; the spring is sleeved on the central connecting rod; the spring inner baffle is fixed in the middle of the central connecting rod and abuts against one end of the spring; the spring outer baffle is sleeved on the central connecting rod and is propped against the other end of the spring; the positioning bolt hole is formed in the shell; according to the limiting pin hole formed in the center connecting rod, during braking, traction force is buffered through spring energy storage, during relieving, the center connecting rod is pushed by a spring outer gear to reset precisely in a millimeter level, the eccentric wear risk of a brake shoe and a wheel is eliminated, tool-free length adjustment is achieved through a reverse threaded connector, and the limiting pin hole and a hard anti-rotation structure of a positioning bolt hole are combined; 95% of initial reset force is still kept under the long-time repeated fatigue working condition, the reliability of a brake system is remarkably improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of railway equipment technology, specifically to a brake beam telescopic tie rod. Background Art

[0002] In the braking system of railway freight car bogies, the grooved brake beam has long faced two major technical bottlenecks: First, in the non-braking state, the brake beam will move laterally due to vibration, causing the slider to collide with the groove, deform or even fall out of the groove, resulting in the twisting and breakage of the brake beam; Second, the reset accuracy after the brake is released is insufficient, causing the brake shoe to be misaligned with the wheel contact surface, accelerating the local wear of the brake shoe and inducing abnormal damage to the wheel tread.

[0003] Traditional grooved brake beam fixing devices have three defects: first, the reset mechanism lacks a pre-compression design; second, there is no rigid anti-rotation mechanism; and third, length adjustment is extremely cumbersome.

[0004] To address the above situation, a brake beam telescopic tie rod was designed to solve the aforementioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a brake beam telescopic tie rod, which solves the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a brake beam telescopic tie rod, installed between two brake beams of the same bogie, one on each side, comprising:

[0007] shell;

[0008] A central connecting rod that runs through the interior of the housing;

[0009] Two connectors symmetrically connected to both ends of the central connecting rod are used to connect the brake beam telescopic rods on both sides respectively;

[0010] A spring fitted onto the central connecting rod;

[0011] An inner spring stop is located in the middle of the central connecting rod and abuts against one end of the spring. The inner spring stop is threadedly connected to the central connecting rod and can slide freely within the outer casing.

[0012] A spring outer stop is sleeved on the central connecting rod and abuts against the other end of the spring, and the spring outer stop has a hole in the middle for the central connecting rod to pass through;

[0013] Positioning bolt holes are provided on the outer casing;

[0014] The limiting pin hole is set on the central connecting rod;

[0015] The device restricts the relative rotation between the outer shell and the central connecting rod by the cooperation of the positioning bolt hole and the limiting pin hole;

[0016] In the non-braking state, the spring is in a pre-compressed state, pushing the outer spring stop to reset the central connecting rod, thereby fixing the two brake beams within the set range;

[0017] In the braking state, the brake beam moves the central connecting rod axially by pulling the connecting head, which in turn causes the outer spring stop to further compress the spring, thus achieving the braking effect.

[0018] When the brake is released, the spring releases its elastic force, pushing the inner spring stop and causing the central connecting rod to move in the opposite direction, thus restoring the brake beam to its initial position.

[0019] Preferably, the outer casing is a cylindrical structure with internal threads at both ends for mounting spring outer stops.

[0020] Preferably, the central connecting rod has reverse threads at both ends, which are respectively connected to the internal threads of the two connectors.

[0021] Preferably, the connector is provided with internal threads for connecting the central connecting rod.

[0022] Preferably, the inner spring stop is fixed to the middle of the central connecting rod by a threaded connection.

[0023] Preferably, the outer spring stop is a slidable retaining ring sleeved on the central connecting rod.

[0024] Preferably, the positioning bolt hole is located in the middle of the side wall of the outer casing and is used to install the anti-rotation positioning bolt.

[0025] Preferably, the limiting pin hole radially penetrates the middle of the central connecting rod and is used to install a limiting pin that mates with the positioning bolt.

[0026] Beneficial effects

[0027] This invention provides a brake beam telescopic tie rod. The invention utilizes a pre-compressed spring and a bidirectionally linked central connecting rod to form a forced reset mechanism. In the non-braking state, it precisely confines the brake beam within a set range, completely preventing structural damage to the brake beam caused by the slider disengaging from its groove. During braking, the spring stores energy to buffer the traction force, and during relief, the outer spring pushes the central connecting rod to precisely reset the brake beam with millimeter-level precision, eliminating the risk of uneven wear between the brake shoe and the wheel. Its reverse threaded connector enables tool-free length adjustment. Combined with the rigid anti-rotation structure of the limiting pin hole and positioning bolt hole, it maintains 95% of the initial reset force even under prolonged and repeated fatigue conditions, significantly improving the reliability of the braking system and reducing maintenance costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the brake beam telescopic tie rod described in this invention.

[0029] Figure 2This is a schematic diagram of the central connecting rod structure of the brake beam telescopic tie rod described in this invention.

[0030] Figure 3 This is an exploded view of the telescopic tie rod of the brake beam described in this invention.

[0031] In the diagram: 1. Outer shell; 2. Spring; 3. Central connecting rod; 4. Connector; 5. Outer spring stop; 6. Inner spring stop; 7. Positioning bolt hole; 8. Limit pin hole. Detailed Implementation

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Please see Figure 1-3 The present invention provides a technical solution: a brake beam telescopic tie rod, installed between two brake beams of the same bogie, one on each side, comprising:

[0034] Outer shell 1;

[0035] A central connecting rod 3 is installed inside the outer casing 1;

[0036] Two connectors 4 are symmetrically connected to both ends of the central connecting rod (3) and are used to connect the brake beam telescopic rods on both sides respectively;

[0037] Spring 2 is fitted onto the central connecting rod 3;

[0038] The inner spring stop 6 is located in the middle of the central connecting rod 3 and abuts against one end of the spring 2. The inner spring stop 6 is threadedly connected to the central connecting rod 3 and can slide freely within the outer casing 1.

[0039] A spring outer stop 5 is sleeved on the central connecting rod 3 and abuts against the other end of the spring 2. The spring outer stop 5 has a hole in the middle for the central connecting rod 3 to pass through.

[0040] The positioning bolt hole 7 is provided on the outer casing 1;

[0041] The limiting pin hole 8 is provided on the central connecting rod 3;

[0042] The device restricts the relative rotation between the outer shell 1 and the central connecting rod 3 by the cooperation of the positioning bolt hole 7 and the limiting pin hole 8;

[0043] In the non-braking state, spring 2 is in a pre-compressed state, pushing the outer spring stop 5 to reset the central connecting rod 3, thereby fixing the two brake beams within the set range;

[0044] In the braking state, the brake beam pulls the connecting head 4 to drive the central connecting rod 3 to move axially, which in turn drives the outer spring stop 5 to further compress the spring 2, thereby achieving the braking effect.

[0045] When the brake is released, spring 2 releases its elastic force to push the inner spring stop 6, which in turn causes the central connecting rod 3 to move in the opposite direction, so that the brake beam returns to its initial position.

[0046] In this embodiment, the outer shell 1 is a cylindrical structure with internal threads at both ends for installing the spring outer stop 5.

[0047] In this embodiment, the central connecting rod 3 is further configured such that both ends are machined with reverse threads, which respectively engage with the internal threads of the two connecting heads 4.

[0048] In this embodiment, the connector 4 is further configured to have an internal thread for connecting the central connecting rod 3.

[0049] In this embodiment, the inner spring stop 6 is further configured to be fixed to the middle of the central connecting rod 3 by means of a threaded connection.

[0050] In this embodiment, the outer spring stop 5 is a slidable retaining ring sleeved on the central connecting rod 3.

[0051] In this embodiment, the positioning bolt hole 7 is located in the middle of the side wall of the outer casing 1 and is used to install the anti-rotation positioning bolt.

[0052] In this embodiment, the limiting pin hole 8 is further configured to radially penetrate the middle of the central connecting rod 3, and is used to install a limiting pin that cooperates with the positioning bolt.

[0053] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0054] Example: Assembly Structure Description:

[0055] Core component assembly

[0056] The central connecting rod (3) is machined from Φ30mm alloy steel bar, with a 20mm wide annular groove machined in the middle.

[0057] The inner spring stop (6) (a 15mm thick quenched steel stop ring) is connected to the central connecting rod by threads.

[0058] Spring (2) is fitted into the central connecting rod (3), with one end pressing against the inner spring stop (6).

[0059] The outer spring stop (5) (sliding stop ring) is fitted into the central connecting rod (3) and presses the other end of the spring.

[0060] Outer shell and anti-rotation mechanism

[0061] The outer shell (1) is a seamless steel pipe with a diameter of 80×600mm and internal threads at both ends.

[0062] Insert the assembled central connecting rod (3) into the outer shell, and the spring inner stop (6) can slide inside the shell.

[0063] Drill a Φ8mm limiting pin hole (8) radially in the middle of the central connecting rod (3), and machine an M10 positioning bolt hole (7) at the corresponding position on the side wall of the outer casing.

[0064] During installation, insert the limit pin and screw in the positioning bolt to tighten the limit pin, preventing the outer casing and connecting rod from rotating relative to each other.

[0065] Connection configuration

[0066] The central connecting rod (3) is machined with reverse M24×1.5 threads at both ends (left end left thread, right end right thread).

[0067] The connector (4) is a forged steel part with matching threads machined in the inner hole and an M27 external thread for connecting the brake beam tie rod at the outer end.

[0068] The total length of the device can be adjusted by screwing the connector (4) (adjustment range ±15mm) to accommodate different brake beam spacings.

[0069] Workflow: Non-braking state

[0070] The spring (2) is in a pre-compressed state (initial compression amount 30mm), and the outer stop of the spring (5) is pushed to reset the central connecting rod (3).

[0071] The two connecting heads (4) pull the brake beam inward to ensure that the brake beam slider is ≥10mm away from the edge of the groove, and prevent it from falling out of the groove.

[0072] Braking process

[0073] The brake cylinder pushes the brake beam outward → the tie rod moves axially through the connector (4) to pull the center connecting rod (3) → the inner spring stop (6) compresses the spring (2) (maximum compression amount 60mm).

[0074] The outer casing (1) is fixed in position by positioning bolts, and only the central connecting rod (3) slides.

[0075] Relieve Reset

[0076] Brake cylinder pressure release → Spring (2) pushes the outer spring stop (5) to move in the opposite direction → Central connecting rod (3) drives the connecting head (4) to return to its original position → Brake beam accurately resets to the initial range.

[0077] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A brake beam telescopic tie rod, installed between two brake beams of the same bogie, one on each side, characterized in that, include: Outer shell (1); A central connecting rod (3) is installed inside the outer casing (1); Two connectors (4) are symmetrically connected to both ends of the central connecting rod (3) and are used to connect the brake beam telescopic rods on both sides respectively; Spring (2) fitted onto the central connecting rod (3); The inner spring stop (6) is located in the middle of the central connecting rod (3) and abuts against one end of the spring (2). The inner spring stop (6) is threadedly connected to the central connecting rod (3) and can slide freely inside the outer shell (1). A spring outer stop (5) is sleeved on the central connecting rod (3) and abuts against the other end of the spring (2). The spring outer stop (5) has a hole in the middle for the central connecting rod (3) to pass through. The positioning bolt holes (7) are provided on the outer casing (1); The limiting pin hole (8) is provided on the central connecting rod (3); The device restricts the relative rotation between the outer shell (1) and the central connecting rod (3) by the cooperation of the positioning bolt hole (7) and the limiting pin hole (8); In the non-braking state, the spring (2) is in a pre-compressed state, pushing the outer spring stop (5) to reset the central connecting rod (3), thereby fixing the two brake beams within the set range; In the braking state, the brake beam drives the central connecting rod (3) to move axially by pulling the connector (4), which in turn drives the outer spring stop (5) to further compress the spring (2) to achieve the braking effect; When the brake is released, the spring (2) releases its elastic force to push the inner spring stop (6), which drives the central connecting rod (3) to move in the opposite direction, so that the brake beam returns to its initial position.

2. The brake beam telescopic tie rod according to claim 1, characterized in that... The outer shell (1) is a cylindrical structure with internal threads at both ends for installing spring outer stops (5).

3. The brake beam telescopic tie rod according to claim 1, characterized in that... The central connecting rod (3) has reverse threads at both ends, which are respectively connected to the internal threads of the two connecting heads (4).

4. The brake beam telescopic tie rod according to claim 1, characterized in that... The connector (4) is provided with internal threads for connecting the central connecting rod (3).

5. The brake beam telescopic tie rod according to claim 1, characterized in that... The inner spring stop (6) is fixed to the middle of the central connecting rod (3) by a threaded connection.

6. The brake beam telescopic tie rod according to claim 1, characterized in that... The spring outer stop (5) is a slidable retaining ring sleeved on the central connecting rod (3).

7. The brake beam telescopic tie rod according to claim 1, characterized in that... The positioning bolt hole (7) is located in the middle of the side wall of the outer shell (1) and is used to install the anti-rotation positioning bolt.

8. The brake beam telescopic tie rod according to claim 1, characterized in that... The limiting pin hole (8) radially penetrates the middle of the central connecting rod (3) and is used to install the limiting pin that cooperates with the positioning bolt.

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