High-strength anti-fracture pull rod screw for brake chamber

Abstract

The invention discloses a high-strength anti-fracture pull rod screw for a brake chamber, and belongs to the technical field of brake chamber pull rod screws, the high-strength anti-fracture pull rod screw comprises a stop screw mounted in the brake chamber and a stop rod fixedly connected to the stop screw, a cylindrical seat is fixedly mounted on the upper end face of the stop rod, and a nut is fixedly mounted on the upper end face of the cylindrical seat. The stop rod is movably sleeved with a balance gasket, and the upper end face of the balance gasket is coaxially and fixedly connected with a sleeve. The sleeve is movably arranged outside the stop rod in a sleeving mode, a circular groove matched with the sleeve is formed in the cylindrical base, and a limiting mechanism for reinforcing the combination with the sleeve is arranged on the cylindrical base; an oil discharge mechanism for discharging oil to lubricate the stop screw to prevent the stop screw from deforming and breaking is arranged on the cylindrical seat, the nut and the stop rod; in the screwing-in installation process, the stop screw can be guided by the balance gasket and the sleeve, the stability of the screwing-in installation direction of the stop screw can be kept, and the situations of vibration, deflection, breakage and the like in the installation process are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of brake air chamber tie rod screws, in particular to a high-strength anti-fracture tie rod screw for a brake air chamber. Background Art

[0002] The brake chamber is an important component in the automobile braking system. It can convert the pressure of compressed air into mechanical thrust to achieve the braking effect. The pull rod screw can be used to adjust the clearance of the brake system to ensure the stability of the braking performance. During the installation process, it is usually necessary to tighten the bolts according to technical requirements and ensure that all parts are correctly aligned.

[0003] For example, the patent with publication number CN216158063U discloses a tie rod screw for connecting and adjusting a split diffuser, which includes a head for connecting to the end of the tie rod and a screw for connecting to the diffuser. The head and the screw are integrally formed, and the head is provided with a receiving cavity. A limit block is arranged in the receiving cavity. The end of the tie rod extends into the receiving cavity and is rotated to be locked at the limit block. By using the tie rod screw with an integrated design, there is no need to weld the pin rod, and the tie rod can be locked by the limit portion, and the welding position can be prevented from falling off due to corrosion in corrosive gas. It is safe, reliable and has high production efficiency.

[0004] For example, the patent with publication number CN116025627A discloses a screw with a stacked screw head, including a threaded portion and a screw head; the threaded portion is suitable for being locked into a locking piece; the screw head is connected to the threaded portion so as to drive the threaded portion to rotate by rotating the screw head, wherein the screw head includes a first screw head and a second screw head, the top of the first screw head has a first groove so that the torque applied to the first groove drives the first screw head to rotate, the bottom of the first screw head is connected to the top of the second screw head via a neck, the top of the second screw head has a second groove and the bottom of the second screw head is connected to the threaded portion, and the connection between the above-mentioned neck and the first or second screw head has a torque bearing capacity that is less than the torque bearing capacity of the first screw head and the second screw head.

[0005] For another example, the patent with publication number CN119222240A discloses a high-strength tie rod screw for brake application, in which the lower end of the butt-connection component is fixedly connected to the tie rod screw end body; the inside of the butt-connection component and the tie rod screw end body is provided with a built-in preset oil supply channel, and the upper end of the built-in preset oil supply channel is bonded and butt-connected with a second bonding sealing layer, and a vertical guide reserved groove is provided at the outer lower end of the butt-connection component. The high-strength pull rod screw for brake application has a reserved butt joint at the lower end which will then contact the inside of the brake disc and move inward, thereby applying pressure to the contacting transverse locking support through its inclined surface, thereby pushing the transverse locking support to move outward along the inside of the butt joint component. As the screw is installed, the transverse locking support on its outside will then perform secondary positioning by means of abutment along the inside of the screw hole, thereby effectively improving the installation strength and stability of the overall screw. The threaded portion of some pull rod screws is relatively long, and the thread is screwed in too deep for installation. In addition, the screwing direction of the pull rod screw cannot be effectively limited during the screwing process, thereby causing material fatigue and damage to the connecting member or the connected member, causing vibration, deflection, and even fracture. In addition, shear heat is generated when the pull rod screw rotates. Under the action of heat and screwing tension, the deformation of the pull rod screw may be aggravated, and even cause it to break.

[0006] In view of the above problems, it is urgent to carry out innovative design based on the original brake air chamber tie rod screw. Summary of the invention

[0007] The object of the present invention is to provide a high-strength anti-fracture tie rod screw for a brake air chamber, so as to solve the problem proposed in the above background technology that the threaded portion of some tie rod screws is relatively long, the depth of the thread screwed into the installation is too deep, and the screwing direction of the tie rod screw cannot be effectively limited during the screwing process, thereby causing material fatigue and damage of the connecting parts or the connected parts, causing vibration, deflection and even fracture.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-strength anti-fracture pull rod screw for a brake air chamber, comprising a stop screw installed in the brake air chamber and a stop rod fixedly connected to the stop screw, a cylindrical seat is fixedly installed on the upper end surface of the stop rod, a nut is fixedly installed on the upper end surface of the cylindrical seat, a balancing washer is provided on the outer movable sleeve of the stop rod, and a sleeve is coaxially fixedly connected to the upper end surface of the balancing washer; the sleeve is movably sleeved on the outside of the stop rod, a circular groove cooperating with the sleeve is provided on the cylindrical seat, and a limiting mechanism for reinforcing the combination with the sleeve is provided on the cylindrical seat; an oil drainage mechanism for draining oil and lubricating the stop screw to prevent it from deformation and fracture is provided on the cylindrical seat, the nut and the stop rod.

[0009] During the process of screwing in and installing, the stop screw penetrates into the interior of the balancing washer and the sleeve. Under the guidance of the balancing washer, the stop screw can be screwed in and moved in a directional and stable manner on the installation plane, avoiding vibration, deflection or breakage during the screwing in process. The combined stop screw, balancing washer and sleeve are more stable, thereby increasing the strength of the overall pull rod screw.

[0010] Preferably, the limiting mechanism includes a slot provided on the outside of the sleeve, and a plurality of elastic cards are fixed at equal angles on the inner wall of the cylindrical seat; the elastic cards are elastically engaged with the outside of the sleeve through the slot.

[0011] When the sleeve moves into the circular groove opened inside the cylindrical seat, the elastic card contacts the outer wall of the sleeve and deforms. When the sleeve completely enters the circular groove, the elastic card and the card slot position outside the sleeve correspond to each other. Under the elastic action of the elastic card itself and the elastic thrust of the lower limit spring block, the elastic card can be elastically restored to its original state. At this time, the elastic card is engaged in the card slot.

[0012] Preferably, the inner side wall of the cylindrical seat is provided with a plurality of embedded grooves at equal angles, and a lower limit spring block is obliquely connected to the embedded groove, and the lower limit spring block is elastically pressed against the side of the elastic card.

[0013] The lower limit spring block is elastically supported on the side of the elastic card, which can support the original position of the elastic card and assist the elastic card to recover to its original state after deformation.

[0014] Preferably, the oil discharge mechanism includes a liquid storage chamber opened in the nut, and an oil outlet channel is opened inside the nut, the cylindrical seat and the stop rod along the central axis direction; a plurality of oil outlets are opened at equal angles on the stop rod, and the oil outlets, the oil outlet channel and the liquid storage chamber are through-connected.

[0015] The oil storage chamber stores cooling and lubricating oil. The oil enters the oil outlet channel through the oil storage chamber and enters the oil outlet port through the oil outlet channel. The oil is finally discharged outward through the oil outlet port. Since multiple oil outlet ports are arranged at equal angles on the stop rod, the oil can flow out evenly and be distributed on the surface of the stop screw.

[0016] Preferably, an annular groove is formed on the outside of the stop rod, and the oil outlets are distributed in an annular shape in the annular groove.

[0017] Preferably, a piercing mechanism is provided in the cylindrical seat to assist in the discharge of oil from the liquid storage chamber, and the piercing mechanism can maintain a through connection between the liquid storage chamber and the oil outlet channel, thereby assisting the discharge of oil to the outside.

[0018] Preferably, the piercing mechanism includes a diaphragm fixed inside the oil outlet channel in the cylindrical seat, and a conical hollow column is slidably arranged inside the oil outlet channel in the cylindrical seat along the central axis, and the sharp end of the conical hollow column is correspondingly arranged below the diaphragm.

[0019] The conical hollow column moves upward in the oil outlet channel inside the cylindrical seat, and the sharp end above the conical hollow column pierces the diaphragm, so that the liquid storage chamber and the oil outlet channel are connected through, so that the oil can flow along the oil outlet channel and be discharged outward.

[0020] Preferably, the cylindrical seat is provided with a plurality of guide grooves at medium angles, a movable frame is slidably connected in the guide groove, and a power sheet is fixedly mounted on the movable frame.

[0021] When the elastic card is deformed, it pushes the power sheet to move toward the direction close to the embedded groove, and the power sheet drives the moving frame to move synchronously, realizing the transmission of power and providing power for the puncture mechanism.

[0022] Preferably, the power sheet is correspondingly arranged in the embedded groove, and the power sheet is attached to the surface of the elastic card; an upper limit spring block is elastically connected in the embedded groove, and the upper limit spring block is elastically pressed against the side of the power sheet at the corner.

[0023] The upper limit spring block is elastically pressed against the side of the power sheet, and can limit the original positions of the power sheet and the elastic card. When the elastic card is deformed to squeeze the power sheet, the upper limit spring block is compressed and deformed.

[0024] Preferably, a moving seat is fixedly mounted on the end surface of the moving frame, a transmission support rod is rotatably connected to the moving seat, and the transmission support rod is rotatably connected to the conical hollow column.

[0025] When the moving frame moves in a directional manner under force, the two ends of the transmission support rod connected between the moving frame and the conical hollow column rotate accordingly, and the transmission support rod provides power to the conical hollow column, driving the conical hollow column to move upward along the direction of the oil outlet channel to achieve the puncture effect on the diaphragm.

[0026] Compared with the prior art, the beneficial effects of the present invention are: the brake air chamber uses a high-strength anti-breakage pull rod screw. During installation, the balance washer is attached to the installation surface through a rubber ring, and the stop screw and the stop rod are arranged through the sleeve and the balance washer. Through the guiding effect of the balance washer and the sleeve, the overall screw-in strength is improved, and the stop screw can be kept stably screwed into the installation plane to avoid vibration, deflection or even breakage.

[0027] Furthermore, a limiting mechanism composed of a reinforcement and a sleeve is provided on the cylindrical seat. As the depth of the stop screw is screwed in, the cylindrical seat gradually moves closer to the sleeve. When the stop screw is fully installed inside the mounting surface, the sleeve enters the circular groove opened inside the cylindrical seat, and the elastic card in the circular groove is engaged with the card groove on the outside of the sleeve, so that the pull rod screw can be more stably installed in the brake air chamber for use.

[0028] When the elastic card initially contacts the sleeve, it is squeezed and pushed into the embedded groove. When the elastic card corresponds to the slot position on the sleeve, under the action of its own elastic force and the elastic thrust of the lower limit spring block, the elastic card is stably engaged in the slot, thereby reinforcing the installation of the pull rod screw.

[0029] Furthermore, an oil drainage mechanism is provided on the cylindrical seat, nut and stop rod to drain oil and lubricate the stop screw to prevent it from deformation and breakage. During the screwing process of the stop screw, the conical hollow column moves upward to pierce the diaphragm, so that the oil in the liquid storage chamber is discharged outward through the conical hollow column, the oil outlet channel and the oil outlet. The oil at the oil outlet flows evenly to the surface of the stop screw, assisting it in heat dissipation and lubrication, and preventing the pull rod screw from deformation and breakage.

[0030] When the stop screw is screwed in to the final position, the elastic card is squeezed and deformed, and the elastic card engages the power plate and the moving frame. Under the transmission action of the moving seat and the transmission support rod, the conical hollow column is controlled to move upward to pierce the diaphragm so that the oil in the liquid storage chamber can be discharged outward. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the stop screw of the present invention.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the stop rod of the present invention.

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the nut of the present invention.

[0034] Figure 4 It is a schematic diagram of the cross-sectional structure of the cylindrical seat of the present invention.

[0035] Figure 5 It is a schematic diagram of the three-dimensional structure of the sleeve of the present invention.

[0036] Figure 6 It is a schematic diagram of the three-dimensional structure of the rubber ring gasket of the present invention.

[0037] Figure 7 It is a schematic diagram of the three-dimensional structure of the diaphragm of the present invention.

[0038] Figure 8 It is a schematic diagram of the three-dimensional structure of the elastic card of the present invention.

[0039] Fig. 9 It is a schematic diagram of the three-dimensional structure of the oil outlet of the present invention.

[0040] Fig.10 It is a schematic diagram of the cross-sectional structure of the stop rod of the present invention.

[0041] Fig.11 It is a schematic diagram of the three-dimensional structure of the mobile frame of the present invention.

[0042] Fig.12 It is a schematic diagram of the three-dimensional structure of the upper limit spring block of the present invention.

[0043] Fig.13 It is a schematic diagram of the three-dimensional structure of the transmission support rod of the present invention.

[0044] In the figure: 1. stop screw; 2. stop rod; 3. cylindrical seat; 4. nut; 5. balance washer; 6. sleeve; 7. rubber gasket; 8. slot; 9. circular slot; 10. elastic card; 11. embedded slot; 12. lower limit spring block; 13. liquid storage chamber; 14. oil outlet channel; 15. annular groove; 16. oil outlet; 17. diaphragm; 18. conical hollow column; 19. guide groove; 20. moving frame; 21. power plate; 22. upper limit spring block; 23. moving seat; 24. transmission support rod. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0046] Example 1: Please refer to Figure 1-Figure 13 The present invention provides the following technical solution: a high-strength anti-fracture pull rod screw for a brake air chamber, comprising a stop screw 1 installed in the brake air chamber and a stop rod 2 fixedly connected to the stop screw 1, a cylindrical seat 3 is fixedly installed on the upper end surface of the stop rod 2, a nut 4 is fixedly installed on the upper end surface of the cylindrical seat 3, a balancing washer 5 is movably sleeved on the outside of the stop rod 2, and a sleeve 6 is coaxially fixedly connected to the upper end surface of the balancing washer 5; the sleeve 6 is movably sleeved on the outside of the stop rod 2, a circular groove 9 cooperating with the sleeve 6 is opened on the cylindrical seat 3, and a limiting mechanism reinforcing the combination with the sleeve 6 is provided on the cylindrical seat 3.

[0047] The limiting mechanism includes a slot 8 provided on the outside of the sleeve 6 , and a plurality of elastic cards 10 are fixed at equal angles on the inner wall of the cylindrical seat 3 ; the elastic cards 10 are elastically engaged with the outside of the sleeve 6 through the slot 8 .

[0048] The inner wall of the cylindrical seat 3 is provided with a plurality of embedded grooves 11 at equal angles, and a lower limit spring block 12 is obliquely connected to the embedded groove 11 . The lower limit spring block 12 is elastically pressed against the side of the elastic card 10 .

[0049] Before installing the pull rod screw in the brake chamber, first stick the balancing washer 5 to the surface of the mounting surface through the rubber gasket 7, then pass the stop screw 1 through the sleeve 6 and the balancing washer 5, and use a tool to control the stop screw 1 to screw into the mounting surface. During the screwing-in process, the movement of the stop screw 1 and the stop rod 2 is guided and limited by the sleeve 6 and the balancing washer 5, thereby improving the overall installation strength of the pull rod screw, maintaining its stable directional screwing-in, and avoiding vibration, deflection and breakage.

[0050] When the stop screw 1 is screwed in and approaches the deepest position, the cylindrical seat 3 gradually moves close to the sleeve 6. The cylindrical seat 3 is sleeved on the outside of the sleeve 6 through the circular groove 9. The sleeve 6 contacts the surfaces of multiple elastic cards 10 distributed at equal angles inside the cylindrical seat 3, pushing the elastic card 10 to elastically deform, so that the elastic card 10 is deformed and moves to the embedded groove 11. The elastic card 10 squeezes the lower limit spring block 12 in the embedded groove 11 to deform. When the sleeve 6 completely enters the circular groove 9 inside the cylindrical seat 3, the position of the elastic card 10 at this time corresponds to the position of the slot 8 opened on the outside of the sleeve 6. Under the elastic action of the elastic card 10 itself and the elastic action of the lower limit spring block 12, the elastic card 10 returns to its original state and is engaged with the slot 8 to strengthen the stability of the pull rod screw installed in the brake air chamber.

[0051] Embodiment 2: Based on Embodiment 1, an oil drainage mechanism is also disclosed, and its specific structure is as follows: an oil drainage mechanism for draining oil and lubricating the stop screw 1 to prevent its deformation and breakage is arranged on the cylindrical seat 3, the nut 4 and the stop rod 2; the oil drainage mechanism includes a liquid storage chamber 13 opened in the nut 4, and an oil outlet channel 14 is opened inside the nut 4, the cylindrical seat 3 and the stop rod 2 along the central axis direction; a plurality of oil outlets 16 are opened at equal angles on the stop rod 2, and the oil outlet 16, the oil outlet channel 14 and the liquid storage chamber 13 are connected through.

[0052] An annular groove 15 is formed on the outside of the stop rod 2 , and oil outlets 16 are distributed in the annular groove 15 in an annular shape.

[0053] The cylindrical seat 3 is provided with a piercing mechanism for assisting the discharge of oil in the liquid storage cavity 13 .

[0054] The piercing mechanism includes a diaphragm 17 fixed inside the oil outlet channel 14 in the cylindrical seat 3, and a conical hollow column 18 is slidably arranged inside the oil outlet channel 14 in the cylindrical seat 3 along the central axis direction, and the sharp end of the conical hollow column 18 is correspondingly arranged below the diaphragm 17.

[0055] The cylindrical seat 3 is provided with a plurality of guide grooves 19 at a medium angle, a moving frame 20 is slidably connected in the guide groove 19 , and a power sheet 21 is fixedly mounted on the moving frame 20 .

[0056] The power sheet 21 is correspondingly arranged in the embedded groove 11, and the power sheet 21 is attached to the surface of the elastic card 10; an upper limit spring block 22 is elastically connected to the embedded groove 11, and the upper limit spring block 22 is elastically pressed against the side of the power sheet 21 at the corner.

[0057] A moving seat 23 is fixedly mounted on the end surface of the moving frame 20 , and a transmission support rod 24 is rotatably connected to the moving seat 23 , and the transmission support rod 24 is rotatably connected to the conical hollow column 18 .

[0058] When the stop screw 1 is screwed in for installation, the elastic card 10 is moved and squeezed by the outer wall of the sleeve 6, and the elastic deformation of the elastic card 10 pushes the power sheet 21 to move inside the embedded groove 11. The power sheet 21 controls the elastic deformation of the upper limit spring block 22 of the side elastic pressure. At the same time, the power sheet 21 controls the moving frame 20 to slide through the guide groove 19, and the moving frame 20 drives the moving seat 23 to move synchronously. At this time, the two ends of the transmission support rod 24 connected between the moving seat 23 and the conical hollow column 18 rotate accordingly, and the rotating transmission support rod 24 The conical hollow column 18 can be controlled to move upward, and the sharp end of the conical hollow column 18 moves to pierce the upper diaphragm 17, so that the oil in the liquid storage chamber 13 can enter the oil outlet channel 14 below, and the oil flows in the oil outlet channel 14 and is finally discharged outward through the oil outlet 16. A plurality of oil outlets 16 are opened at equal angles in the stop rod 2. The oil discharged through the oil outlet 16 can flow evenly and cover the surface of the stop screw 1, which plays a role in cooling and lubricating, and further avoids deformation and breakage of the stop screw 1.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength anti-fracture pull rod screw for a brake air chamber, comprising a stop screw (1) mounted on the brake air chamber and a stop rod (2) fixedly connected to the stop screw (1), characterized in that: A cylindrical seat (3) is fixedly mounted on the upper end surface of the stop rod (2), a nut (4) is fixedly mounted on the upper end surface of the cylindrical seat (3), a balancing washer (5) is provided on the outer movable sleeve of the stop rod (2), and a sleeve (6) is coaxially fixedly connected to the upper end surface of the balancing washer (5); The sleeve (6) is movably sleeved on the outside of the stop rod (2); a circular groove (9) cooperating with the sleeve (6) is provided on the cylindrical seat (3); and a limiting mechanism is provided on the cylindrical seat (3) to reinforce the combination with the sleeve (6); The cylindrical seat (3), the nut (4) and the stop rod (2) are provided with an oil discharge mechanism for draining oil and lubricating the stop screw (1) to prevent the stop screw (1) from deformation and fracture.

2. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 1, characterized in that: The limiting mechanism comprises a card slot (8) formed on the outside of the sleeve (6), and a plurality of elastic card slots (10) are fixed at equal angles on the inner side wall of the cylindrical seat (3); The elastic card (10) is elastically engaged with the outside of the sleeve (6) via the card slot (8).

3. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 2, characterized in that: The inner side wall of the cylindrical seat (3) is provided with a plurality of embedded grooves (11) at equal angles, and a lower limit spring block (12) is obliquely connected to the embedded groove (11), and the lower limit spring block (12) is elastically pressed against the side of the elastic card (10).

4. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 1, characterized in that: The oil discharge mechanism comprises a liquid storage cavity (13) formed in the nut (4); an oil outlet passage (14) is formed inside the nut (4), the cylindrical seat (3) and the stop rod (2) along the central axis. The stop rod (2) is provided with a plurality of oil outlets (16) at equal angles, and the oil outlets (16), the oil outlet passages (14) and the liquid storage chamber (13) are connected in a continuous manner.

5. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 4, characterized in that: An annular groove (15) is formed on the outside of the stop rod (2), and oil outlets (16) are distributed in an annular shape in the annular groove (15).

6. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 1, characterized in that: The cylindrical seat (3) is provided with a piercing mechanism for assisting the discharge of oil in the liquid storage cavity (13).

7. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 6, characterized in that: The piercing mechanism comprises a diaphragm (17) fixed inside the oil outlet channel (14) in the cylindrical seat (3), and a conical hollow column (18) is slidably arranged inside the oil outlet channel (14) in the cylindrical seat (3) along the central axis direction, and the sharp end of the conical hollow column (18) is correspondingly arranged below the diaphragm (17).

8. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 7, characterized in that: The cylindrical seat (3) is provided with a plurality of guide grooves (19) at medium angles, a movable frame (20) is slidably connected in the guide groove (19), and a power sheet (21) is fixedly mounted on the movable frame (20).

9. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 8, characterized in that: The power sheet (21) is correspondingly arranged in the embedded groove (11), and the power sheet (21) is attached to the surface of the elastic card (10); An upper limit spring block (22) is elastically connected to the embedded groove (11), and the upper limit spring block (22) is elastically pressed against the side of the power plate (21) at a folded corner.

10. The high-strength anti-fracture pull rod screw for a brake air chamber according to claim 8, characterized in that: A moving seat (23) is fixedly mounted on the end surface of the moving frame (20), a transmission support rod (24) is rotatably connected to the moving seat (23), and the transmission support rod (24) is rotatably connected to the conical hollow column (18).

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