Connecting assembly for brake shoe gap adjuster of railway wagon

Abstract

The utility model relates to a connecting assembly for a brake shoe gap adjuster of a railway wagon, which comprises a cylinder and a shaft sleeve, the inner diameter of the cylinder is used for a pull rod of a brake shoe stack adjuster to penetrate into and be connected with the cylinder, the cylinder comprises a straight cylinder section and a continuous variable cross-section section, and the end part of the straight cylinder section is provided with an internal thread used for connecting a front end cover of the brake shoe stack adjuster. The inner diameter of the shaft sleeve corresponds to that of the pull rod, and a shaft hole of the shaft sleeve is movably connected with the pull rod. Compared with the prior art, the shaft sleeve is tightly sleeved in the connecting variable cross-section section of the cylinder, an end cover in the prior art is replaced, the separation fault of the cylinder and the rear end cover can be eradicated, and therefore the working sensitivity of the brake shoe stack adjuster is improved, and the service life of the brake shoe stack adjuster is prolonged.

Description

Technical Field

[0001] The utility model relates to a cylindrical cylinder structural component, in particular to a connecting assembly for a brake shoe clearance adjuster of a railway freight car. Background Art

[0002] The bidirectional brake shoe clearance automatic adjuster (brake adjuster for short) of a railway freight car is an important component in the braking system of a railway freight car. It is used to automatically adjust the position of the brake lever to ensure that the brake cylinder can maintain the specified pressure range during braking.

[0003] The main components of the bidirectional brake shoe clearance adjuster are installed within the barrel cavity. The adjustment screw and pull rod extend through the circular holes of the front and rear end covers of the barrel, respectively. During the brake adjuster clearance adjustment process, there is rotational and axial movement between the screw, pull rod, and the front and rear end covers of the barrel. Typically, after the brake adjuster is assembled with various accessories within the barrel, the external threads of the front cover and the internal threads of the barrel are mated and fixed. The rear end cover and barrel are first integrated before the brake adjuster is assembled. Generally, the circular boss of the rear end cover is inserted into the cylinder at the end of the barrel, and the cylindrical wall at the end of the barrel is deformed by pressure shrinkage to constrain the rear end cover.

[0004] Due to structural limitations, the wall thickness of the barrel at the necking and deformation section is only 2mm. Therefore, this connection is prone to loosening, rusting, and corrosion after prolonged use. The constant axial and circumferential relative movement of the barrel and the tie rod during operation accelerates failure of this connection. After prolonged operation, the barrel and the rear end cover can easily separate, causing the brake regulator to malfunction. Due to the relative movement between the rear end cover and the tie rod, excessive wear and tear can easily lead to failure after prolonged operation. To meet the current requirements for reducing the failure rate of bidirectional brake shoe clearance automatic adjusters on railway freight cars, the brake regulator barrel must be structurally reliable, trouble-free, minimize wear and tear, be cost-effective, and be interchangeable with the original structure. Summary of the Invention

[0005] In response to the above technical problems, the utility model provides a connecting assembly for a brake shoe gap adjuster of a railway freight car. The cylinder and the shaft sleeve are integrally arranged, and the shaft sleeve replaces the rear end cover in the prior art, which can eliminate the separation failure of the cylinder and the rear end cover, thereby improving the working sensitivity and service life of the brake adjuster.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A connection assembly for a railway freight car brake shoe clearance adjuster, comprising:

[0008] A cylinder, the inner diameter of which is for the adjustment parts and the pull rod of the brake adjuster to penetrate and connect, the cylinder comprising a straight section and a continuously variable cross-section section, wherein the end of the straight section is provided with an internal thread for connecting to the front end cover of the brake adjuster; and

[0009] A shaft sleeve is tightly sleeved in the connecting variable cross-section section, the inner diameter of the shaft sleeve corresponds to the pull rod, and the inner diameter of the shaft sleeve is provided for the movable connection of the pull rod.

[0010] In one possible embodiment, the continuously variable cross-section segment includes a hexagonal barrel segment, and the hexagonal barrel segment is located correspondingly in the middle of the sleeve.

[0011] In one possible embodiment, the continuously variable cross-section section further includes a reduced diameter platform pipe section and a supporting pipe section;

[0012] The reducing platform pipe section is used to transitionally connect the hexagonal cylinder section and the straight cylinder section, and the supporting pipe section is connected to the hexagonal cylinder section.

[0013] In one possible implementation manner, a reinforcement ring is provided at the end of the support pipe section.

[0014] In one possible implementation manner, a first sealing groove is provided on the inner wall of the supporting pipe section.

[0015] In one possible embodiment, two first sealing grooves are provided at intervals in front and back.

[0016] In one possible implementation manner, one end surface of the sleeve that penetrates into the cylinder is a spring bearing surface, and the spring bearing surface is used to contact and bear pressure with the main spring of the pull rod.

[0017] In one possible implementation manner, the outer edge of the spring bearing surface contacts the inner wall of the cylinder, and a spring positioning ring is protruding inside the spring bearing surface, and a positioning gap is formed between the spring positioning ring and the inner wall of the cylinder for positioning the end of the main spring.

[0018] The utility model has the following advantages due to the adoption of the above technical solution:

[0019] 1. The utility model adopts an outer cylinder structure with an integral multi-section cross-section and continuous transition, so that the cylinder of the gate regulator becomes a single part, which can prevent the separation accident that may occur when the straight cylinder and the rear end cover are connected in a shrinking and deformed manner, thereby improving the reliability of the gate regulator;

[0020] 2. The cylinder of this utility model adopts a seamless steel pipe integral molding scheme, eliminating the need for a rear end cover. This can greatly reduce the workload of mechanical processing, and the manufacturing process is simple, making it easy to achieve mass production and reduce costs;

[0021] 3. The shaft sleeve of this utility model is made of nylon or polytetrafluoroethylene and is injection molded within the outer cylinder. The contact area between its outer surface and the cylinder is naturally filled and formed, and the shaft hole is formed by the mold core, which is simple in process and low in cost. The cylindrical surface of the shaft hole and the cylindrical surface of the pull rod are clearance-matched. When the pull rod and the cylinder rotate or move axially during operation, the friction and mutual wear can be greatly reduced, thereby improving the overall performance and life of the brake regulator. In addition, an O-ring is installed in the second sealing groove of the shaft sleeve to effectively prevent dust from entering the cylinder with the movement of the pull rod.

[0022] 4. The outer wall of the sleeve of the utility model is integrated with the inner wall of the straight cylinder, the inner wall of the reduced diameter platform tube section, the inner wall of the hexagonal cylinder section, the inner wall of the support tube section, and the first sealing groove. This ensures reliable axial and circumferential connection strength between the inner sleeve and the outer cylinder, and also provides a sealing function between the inner wall of the outer cylinder. It is firm and reliable when subjected to axial pressure from the main spring, and its structure has the function of limiting force separation.

[0023] 5. Due to the adoption of a steel-plastic integrated composite structure, the utility model reduces its deadweight by 10% compared with the original cylinder structure while maintaining the same functional performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the specific structure of the cylinder in one embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Left view of;

[0026] Figure 3 yes Figure 2 BB cross-sectional view;

[0027] Figure 4 yes Figure 1 DD cross-sectional view;

[0028] Figure 5 This is an axonometric diagram of a cylinder in one embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the external structure of the cylinder in one embodiment of the present invention;

[0030] Figure 7 This is an enlarged schematic diagram of the cross section of the end portion of the cylinder in one embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the assembly relationship between the cylinder, the pull rod and the spring in one embodiment of the utility model.

[0032] Reference numerals:

[0033] 1. Cylinder; 10. Straight section; 11. Reduced-diameter section; 12. Support section; 13. Hexagonal section; 14. Reinforcement ring; 15. First sealing groove; 17. Internal thread; 2. Bushing; 21. Spring bearing surface; 22. Spring locating ring; 23. Shaft hole; 24. Second sealing groove; 25. Labyrinth seal; 100. Tie rod; 110. Sealing ring; 120. Main spring; DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the present invention more clear, the following is a clear and complete description of the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work are within the scope of protection of the present invention.

[0035] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the usual meanings understood by persons of ordinary skill in the field to which this utility model belongs. The words "first", "second", "third", "fourth" and similar terms used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0036] Typically, after the various accessories of the gate regulator are assembled within the cylinder, the external threads of the front end cover and the internal threads of the cylinder are mated and fixed. The rear end cover and cylinder are first integrated before the gate regulator is assembled. Generally, the circular boss of the rear end cover is inserted into the cylinder at the end of the cylinder, and the cylindrical wall at the end of the cylinder is deformed by pressure shrinking to constrain the rear end cover. Due to structural limitations, the wall thickness of the cylinder at the shrinking deformation part is only 2mm. Therefore, after long-term use of the gate regulator, this connection is prone to loosening, rusting and corrosion. During the continuous axial and circumferential relative movement between the cylinder and the pull rod, this connection will accelerate failure. After a long period of operation, the cylinder and the rear end cover are prone to separation, causing the gate regulator to malfunction. Due to the relative movement between the rear end cover and the pull rod, it is easy to be scrapped due to excessive wear after long-term operation. In response to the above technical problems, the present invention provides a connecting assembly for a brake shoe gap adjuster of a railway freight car. The cylinder and the shaft sleeve are integrally arranged. The shaft sleeve replaces the end cover in the prior art, which can prevent the separation failure of the cylinder and the end cover, thereby improving the working sensitivity and service life of the brake adjuster. The technical solution of the present invention is described in detail below with reference to specific examples.

[0037] Reference Figure 1 、 Figure 2 as well as Figure 3 As shown, the present invention relates to a connection assembly for a railway freight car brake shoe clearance adjuster, comprising a cylinder 1 and a sleeve 2. The inner diameter of the cylinder 1 allows the brake adjuster's adjustment components and a pull rod 100 to pass through and connect. The cylinder 1 comprises a straight section 10 and a continuously variable cross-section section. The end of the straight section 10 is provided with an internal thread 17 for connecting to the brake adjuster's front end cover. The sleeve 2 is tightly fitted within the variable cross-section section, with its inner diameter corresponding to the pull rod 100. The axial hole 23 of the sleeve 2 allows the pull rod 100 to be movably connected.

[0038] It should be noted that in this embodiment, the connecting assembly is used as a whole in a railway freight car brake shoe clearance adjuster. During use, the internal adjustment components of the brake adjuster need to be installed in the straight section 10. The internal thread 17 of the cylinder 1 is connected to the front end cover, and the brake adjuster's pull rod 100 is movably connected to the sleeve 2. Because the main spring 120 is installed on the pull rod 100, the overall inner diameter of the straight section 10 needs to be matched. To avoid the sleeve 2 being too thick, a continuous variable cross-section section is provided so that the inner diameter of the cylinder 1 corresponding to the sleeve 2 can match the pull rod 100. The continuous variable cross-section section appropriately deforms and shrinks the inner diameter, optimizing the tightly integrated structure of the sleeve 2 and the cylinder 1. Compared with the prior art, the sleeve 2 is tightly sleeved in the connecting variable cross-section section of the cylinder 1, replacing the rear end cover in the prior art, which can prevent the separation failure of the cylinder 1 and the rear end cover, thereby improving the working sensitivity and service life of the brake adjuster.

[0039] Reference Figure 4 as well as Figure 5 As shown, in one embodiment, the overall structure of the continuous variable cross-section segment is further refined, and the continuous variable cross-section segment includes a hexagonal barrel segment 13 , and the hexagonal barrel segment 13 is located correspondingly in the middle of the shaft sleeve 2 .

[0040] The hexagonal barrel section 13 can form a hexagonal outer contour and inner contour. When assembling the connection assembly and the brake regulator, the outer contour can be used to clamp the barrel 1, and in application, it is convenient to use a wrench to clamp the outer contour and rotate the barrel 1 to adjust the screw stroke. The inner contour is adapted to the sleeve 2. The inner wall formed by the inner contour can enhance the connection and bite force between the sleeve 2 and the pull rod 100. During use, the pull rod 100 will slide and rotate, and the hexagonal inner contour can position the sleeve 2 circumferentially, limiting the sleeve 2 from rotating with the pull rod 100. The structural setting of the hexagonal barrel section 13 can not only optimize the convenience of using and controlling the barrel 1, but also further improve the stability of the sleeve 2.

[0041] Reference Figure 6 as well as Figure 7In this embodiment, the continuously variable cross-section section further includes a reduced diameter platform section 11 and a support section 12. The reduced diameter platform section 11 serves to transitionally connect the hexagonal barrel section 13 and the straight barrel section 10, while the support section 12 connects the hexagonal barrel section 13. In addition to providing structural connection, the inner walls of the reduced diameter platform section 11 and the support section 12 are also used to connect and secure the inner sleeve 2 and transmit force.

[0042] In this embodiment, it is more preferable that a reinforcement ring 14 is provided at the end of the support pipe section 12 in order to improve the end strength and rigidity of the support pipe section 12 .

[0043] In this embodiment, it is more preferred that a first sealing groove 15 is provided on the inner wall of the supporting pipe section 12 .

[0044] It should be noted that the first sealing groove 15 can form a labyrinth seal 25 with the shaft sleeve 2, thereby creating a reliable seal between the inner wall of the support tube section 12 and the outer wall of the shaft sleeve 2, thereby preventing corrosion between the inner wall of the outer cylinder 11 and the outer wall of the inner shaft sleeve 2. To further optimize this sealing effect, in this embodiment, two first sealing grooves 15 are provided, spaced apart from each other.

[0045] In one embodiment, the overall structure of the sleeve 2 is further refined. One end surface of the sleeve 2 that penetrates into the cylinder 1 is a spring bearing surface 21 . The spring bearing surface 21 is used to contact and bear pressure with the main spring 120 on the pull rod 100 .

[0046] Because the overall cross-section of the continuous variable cross-section segment is a transition setting, when the inner sleeve 2 is installed, the outer wall of the sleeve 2 will fit tightly with the inner wall of the continuous variable cross-section segment. At this time, the cross-section of its transition setting will have a positioning and fixing effect on the axial direction of the sleeve 2. Even if the spring bearing surface 21 on the end face of the sleeve 2 contacts and bears pressure with the main spring 120 on the pull rod 100, the sleeve 2 can still play a good positioning and pressure-bearing role.

[0047] In this embodiment, it is more preferred that the outer edge of the spring bearing surface 21 contacts the inner wall of the cylinder 1, and a spring positioning ring 22 is protruding inside the spring bearing surface 21, and a positioning gap is formed between the spring positioning ring 22 and the inner wall of the cylinder 1 for positioning the end of the main spring 120.

[0048] With the cooperation of the positioning gap, the shaft sleeve 2 as a whole not only has a good pressure-bearing effect, but also can play a good positioning and limiting role.

[0049] In this embodiment, it is more preferable that a second sealing groove 24 is provided inside the shaft sleeve 2 in order to prevent dust from entering the interior of the cylinder 1 along with the movement of the pull rod 100 , and a sealing ring 110 is installed in the second sealing groove 24 .

[0050] This solution also provides a method for manufacturing the connection component:

[0051] The cylinder 1 is made of seamless steel pipe raw materials through multiple processes such as mechanical cutting, heating of the deformed part of the steel pipe, pipe shrinking, pressing, flanging and pressing, and mechanical processing;

[0052] During manufacturing, the portion of the steel pipe body that needs to be deformed is first heated to 750°C to 800°C by electromagnetic induction, and then the pipe is integrally processed into a reduced diameter platform pipe section 11 and a support pipe section 12 of equal wall thickness by a spinning or die-compression pipe forming process;

[0053] Further, a hexagonal tube section 13 is formed by pressing the middle portion of the support tube section 12 with a mold;

[0054] A flanging press die is further used to press a reinforcement ring 14 at the end of the support pipe section 12;

[0055] Then, the first sealing groove 15 of the support pipe section 12 and the internal thread 17 of the inner circle of the end of the straight tube section 10 are processed by mechanical processing. At this point, the cylinder body 1 is completed.

[0056] The sleeve 2 is made of polymer materials such as nylon or polytetrafluoroethylene by injection molding in the inner cavity of the left side of the straight tube section 10 of the cylinder 1, the reduced diameter platform tube section 11, the support tube section 12, and the hexagonal tube section 13.

[0057] Reference Figure 8 As shown, this solution also provides a method for installing the connecting component. Before assembling the cylinder 1, remove any foreign matter and apply grease. Then, assemble the corresponding sealing ring 110 in the second sealing groove 24 of the sleeve 2. Install the main spring 120 from the front end of the cylinder 1, then pass the pull rod 100 through the main spring 120 and the axial hole 23 of the sleeve 2. Then, proceed to the subsequent assembly steps of the brake regulator.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A connection assembly for a railway freight car brake shoe gap adjuster, characterized in that: include: A cylinder, the inner diameter of which is for the adjustment parts and the pull rod of the brake adjuster to pass through and connect, and the cylinder comprises a straight section and a continuously variable cross-section section, wherein the end of the straight section is provided with an internal thread for connecting to the front end cover of the brake adjuster; as well as A shaft sleeve, the shaft sleeve is tightly sleeved in the connecting variable cross-section section, the inner diameter of the shaft sleeve corresponds to the pull rod, and the inner diameter of the shaft sleeve is provided for the movable connection of the pull rod; The continuously variable cross-section section includes a hexagonal barrel section, and the hexagonal barrel section is located correspondingly in the middle of the shaft sleeve; The continuous variable cross-section section also includes a reduced diameter platform pipe section and a supporting pipe section; The reducing platform pipe section is used to transitionally connect the hexagonal cylinder section and the straight cylinder section, and the supporting pipe section is connected to the hexagonal cylinder section.

2. The connection assembly according to claim 1, characterized in that A reinforcement ring is provided at the end of the supporting pipe section.

3. The connection assembly according to claim 1, characterized in that The inner wall of the supporting pipe section is provided with a first sealing groove.

4. The connection assembly according to claim 3, characterized in that Two first sealing grooves are provided at intervals in front and back.

5. The connection assembly according to claim 1, characterized in that One end surface of the shaft sleeve that penetrates into the cylinder is a spring bearing surface, and the spring bearing surface is used to contact and bear pressure with the main spring of the pull rod.

6. The connection assembly according to claim 5, characterized in that The outer edge of the spring bearing surface contacts the inner wall of the cylinder, and a spring positioning ring is protruding from the interior of the spring bearing surface. A positioning gap is formed between the spring positioning ring and the inner wall of the cylinder for positioning the end of the main spring.

Images