A brake spring positioning structure for a parking brake air chamber

Abstract

The present invention provides a brake spring positioning structure of a parking brake air chamber, comprising a middle air chamber assembly, a membrane, an upper shell, a spring seat, a brake spring and a positioning sleeve, wherein the membrane is crimped between the upper shell and the middle air chamber assembly and forms a parking cavity with the middle air chamber assembly, and is characterized in that the spring seat, the brake spring and the positioning sleeve are concentrically assembled in the cavity formed by the membrane and the upper shell, the inner center of the upper shell has an inwardly recessed annular cone, the sleeve body of the positioning sleeve matches the annular cone, and the positioning sleeve has a first positioning portion, a second positioning portion and a third positioning portion, and the inner hole of the lower port of the brake spring is positioned and matched through the first positioning portion, the second positioning portion and the third positioning portion, the base portion of the spring seat is disc-shaped and abuts against the membrane, and the main body portion thereof has a plurality of evenly distributed variable diameter structures, and the inner hole of the upper port of the brake spring is positioned and matched through the variable diameter structures.

Description

Technical Field

[0001] The invention relates to the field of automobile air brake systems, and in particular to a brake spring positioning structure of a parking brake air chamber. Background Art

[0002] The brake system is a series of special devices used on automobiles to force certain parts of the automobile (mainly wheels) to apply a certain force to the outside world (mainly the road surface) to force braking to a certain extent. Commercial vehicles mainly use air brake systems, which use compressed air to actuate mechanical actuators to provide the braking force required for deceleration and parking of the vehicle. The brake chamber is the brake actuator of commercial vehicles. The spring brake chamber is part of the automobile brake system, generally installed on the drive axle of the automobile, and is widely used in trucks, trucks and buses in the air brake system.

[0003] As we all know, the brake air chamber is generally divided into double diaphragm type and piston type according to the difference in the parking cavity structure.

[0004] The parking cavity of the brake air chamber with a double diaphragm structure is sealed with a diaphragm. Diaphragms are installed in the front and rear cavities of the cylinder body. The spring seat transmits the mechanical braking force of the spring. Due to poor positioning of the spring seat, the parking cavity spring tilts during braking, forcing the spring seat to shift and causing uneven force on the diaphragm, resulting in wear and leakage of the diaphragm and failure. At the same time, the tilt of the spring seat during use causes abnormal deformation of the spring, affecting the service life of the device.

[0005] The parking chamber piston of the piston-type brake air chamber has a sealing ring and a guide ring on the outside; the piston is equipped with a sealing ring with a lip, which cooperates with the cylinder body of the parking chamber to form a seal, so the parking brake chamber cannot absorb sand, dust, etc., otherwise it is easy to scratch the inner cavity, causing scratches on the sealing lip, thereby causing air leakage; if there is moisture in the brake line, the piston may freeze due to the low temperature in winter, causing the parking brake to take effect and the vehicle to be unable to drive normally. Summary of the invention

[0006] In order to solve the above-mentioned technical problems and overcome the shortcomings in the prior art, the present invention provides a brake spring positioning structure for a parking brake air chamber, which solves the problem of poor positioning of the spring seat and the positioning sleeve with the brake spring. The parking chamber brake spring always moves in a straight line during the braking process without tilting or offsetting. The membrane is evenly stressed, which avoids leakage and failure of the membrane due to wear. At the same time, the spring seat will not tilt during use, and the spring will not be abnormally deformed, thereby extending the service life of the device.

[0007] The technical solution adopted by the present invention to solve the above-mentioned problem is: the brake spring positioning structure of the parking brake air chamber includes a middle air chamber assembly, a membrane, an upper shell, a spring seat, a brake spring and a positioning sleeve, the membrane is crimped between the upper shell and the middle air chamber assembly and forms a parking cavity with the middle air chamber assembly, and is characterized in that the spring seat, the brake spring and the positioning sleeve are concentrically assembled in the cavity formed by the membrane and the upper shell, the inner center of the upper shell has an inwardly recessed annular cone, the sleeve body of the positioning sleeve matches the annular cone, and the positioning sleeve has a first positioning portion, a second positioning portion and a third positioning portion, and the inner hole of the lower port of the brake spring is positioned and matched through the first positioning portion, the second positioning portion and the third positioning portion, the base portion of the spring seat is disc-shaped and abuts against the membrane, and its main body has a plurality of evenly distributed variable diameter structures, and the inner hole of the upper port of the brake spring is positioned and matched through the variable diameter structures. The locating sleeve, spring seat, brake spring and upper shell body in the present invention have high concentricity and good centering, and the assembly is simpler and faster, and the assembly accuracy and assembly efficiency are improved; the sleeve body of the locating sleeve matches the annular cone of the upper shell body and will not be offset; through the arrangement of the first locating portion, the second locating portion and the third locating portion and the variable diameter structure, the problem of poor positioning of the spring seat and the locating sleeve and the brake spring is solved, and the parking chamber brake spring always rests on the spring seat for linear motion during the braking process, the brake spring is evenly compressed without tilting or offset, the membrane is evenly stressed, and the damage to the membrane caused by the offset due to the lack of positioning of the brake spring is avoided, and the failure of the membrane due to air leakage is avoided. At the same time, the spring seat will not tilt during use, and the spring will not be abnormally deformed, thereby extending the service life of the device.

[0008] As a further description of the above technical solution: when the brake spring is compressed and the upper end of the positioning sleeve abuts against the variable diameter structure of the spring seat, the distance between the circular outer edge of the bottom of the positioning sleeve and the base portion of the spring seat is greater than the height of the support ring after the brake spring is compressed. Through the structural design of the positioning sleeve and the variable diameter structure on the spring seat, the brake spring will never be compressed to the height of its support ring when compressed, thereby ensuring the service life of the spring.

[0009] As a further description of the above technical solution: the sleeve body of the positioning sleeve is a conical sleeve, the edge of the large end opening of the sleeve body is integrally formed with the outer edge, and the edge of the small end opening has a bending portion extending inward, the sleeve body is integrally formed with a first positioning portion and a second positioning portion, and the axis of the first positioning portion and the axis of the second positioning portion are respectively perpendicular to the plane formed by the axis of the sleeve body, the first positioning portion and the second positioning portion are both arc-shaped protrusions, and their radial outer edge lines are parallel to the axis of the sleeve body; the outer edge is formed with the third positioning portion at a position away from the first positioning portion and the second positioning portion, the third positioning portion is a rectangular protrusion, and a fan-shaped notch is provided on one side of the third positioning portion.

[0010] As a further description of the above technical solution: the main part of the spring seat is conical, and has six evenly distributed variable diameter structures integrally formed therein. The variable diameter structure is a rectangular boss perpendicular to the base part, and the length of the variable diameter structure gradually increases in the counterclockwise direction of the spring seat.

[0011] As a further description of the above technical solution: the distance between the outer edge of the bottom of the positioning sleeve and the base of the spring seat is 41 mm.

[0012] As a further description of the above technical solution: the distance between the outer edge line of the farthest end of the first positioning portion in the radial direction and the axis of the sleeve is 39 mm; the distance between the outer edge line of the farthest end of the second positioning portion in the radial direction and the axis of the sleeve is 35.5 mm; the central angle of the fan-shaped notch is 38°.

[0013] As a further description of the above technical solution: the width of the variable diameter structure is 5 mm, and the length range is 34 mm to 42 mm.

[0014] As a further description of the above technical solution: the brake spring positioning structure of the parking brake air chamber can be used for both double-diaphragm brake air chambers and piston brake air chambers.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The concentricity of the locating sleeve, spring seat, brake spring and upper shell is high, the centering is good, the assembly is simpler and faster, and the assembly accuracy and efficiency are improved;

[0017] 2. The sleeve body of the positioning sleeve matches the annular truncated cone of the upper shell without any deviation;

[0018] 3. Through the structural design of the positioning sleeve and the variable diameter structure on the spring seat, the brake spring will never be compressed to the height of its support ring when compressed, ensuring the service life of the spring;

[0019] 4. The problem of poor positioning of the spring seat, the positioning sleeve and the brake spring is solved by setting the first positioning part, the second positioning part and the third positioning part and the variable diameter structure. The parking chamber brake spring always rests on the spring seat and makes linear motion during braking. The brake spring is evenly compressed without tilting or offsetting. The membrane is evenly stressed, which avoids damage to the membrane caused by bias due to lack of positioning of the brake spring and avoids failure of the membrane due to air leakage. At the same time, the spring seat will not tilt during use and the spring will not be abnormally deformed, thereby extending the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is an assembly diagram of the brake spring positioning structure of the parking brake air chamber in the present invention.

[0022] Figure 2 The utility model is a schematic diagram of the local parts structure of the brake spring positioning structure of the parking brake air chamber in the present invention.

[0023] Figure 3 The invention is an assembly diagram of a brake spring positioning structure of a parking brake air chamber used for a double-diaphragm brake air chamber.

[0024] Figure 4 The present invention is a schematic structural diagram of a positioning sleeve of a brake spring positioning structure of a parking brake air chamber.

[0025] Figure 5 yes Figure 4 Section view of section AA in the figure.

[0026] Figure 6 yes Figure 4 Cross-sectional view of section BB.

[0027] Figure 7 It is a structural schematic diagram of a spring seat of a brake spring positioning structure of a parking brake air chamber in the present invention.

[0028] Figure 8 yes Figure 7 Section view of section AA in the figure.

[0029] Fig. 9 yes Figure 7 Cross-sectional view of section BB.

[0030] Fig.10 yes Figure 7 Cross-sectional view of section CC. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0032] Example 1

[0033] A brake spring 5 positioning structure of a parking brake air chamber in an embodiment of the present invention comprises a middle air chamber assembly 1, a diaphragm 2, an upper shell 3, a spring seat 4, a brake spring 5 and a positioning sleeve 6, wherein the diaphragm 2 is crimped between the upper shell 3 and the middle air chamber assembly 1 and forms a parking cavity with the middle air chamber assembly 1, the spring seat 4, the brake spring 5 and the positioning sleeve 6 are concentrically assembled in the cavity formed by the diaphragm 2 and the upper shell 3, the inner center of the upper shell 3 has an inwardly recessed annular truncated cone, the sleeve body 64 of the positioning sleeve 6 matches the annular truncated cone, and the positioning sleeve 6 has a first positioning portion 61, a second positioning portion 62 and a third positioning portion 63, and the inner hole of the lower port of the brake spring 5 is positioned and matched by the first positioning portion 61, the second positioning portion 62 and the third positioning portion 63, the base portion 41 of the spring seat 4 is disc-shaped and abuts against the diaphragm 2, and the main body 42 thereof has a plurality of evenly distributed variable diameter structures 43, and the inner hole of the upper port of the brake spring 5 is positioned and matched by the variable diameter structures 43. The sleeve body 64 of the positioning sleeve 6 matches the annular cone of the upper shell body 3 and will not cause offset; through the arrangement of the first positioning portion 61, the second positioning portion 62 and the third positioning portion 63 and the variable diameter structure 43, the problem of poor positioning of the spring seat 4, the positioning sleeve 6 and the brake spring 5 is solved. The parking chamber brake spring 5 always rests on the spring seat 4 for linear motion during braking. The brake spring 5 is evenly compressed without tilting or offset. The diaphragm 2 is evenly stressed, avoiding damage to the diaphragm 2 caused by the lack of positioning of the brake spring 5 and avoiding air leakage and failure of the diaphragm 2. At the same time, the spring seat 4 will not tilt during use, and the spring will not be abnormally deformed, thereby extending the service life of the device.

[0034] When the brake spring 5 is compressed and the upper end of the positioning sleeve 6 abuts against the variable diameter structure 43 of the spring seat 4, the distance between the circular outer edge 65 at the bottom of the positioning sleeve 6 and the base portion 41 of the spring seat 4 is greater than the height of the support ring after the brake spring 5 is compressed. Through the structural design of the positioning sleeve 6 and the variable diameter structure 43 on the spring seat 4, the brake spring 5 will never be compressed to the height of its support ring when compressed, thereby ensuring the service life of the spring.

[0035] The sleeve body 64 of the positioning sleeve 6 is a conical sleeve, and the edge of the large end opening of the sleeve body 64 is integrally formed with the outer edge 65, and the edge of the small end opening has a bending portion extending inward, and the first positioning portion 61 and the second positioning portion 62 are integrally formed on the sleeve body 64, and the axis of the first positioning portion 61 and the axis of the second positioning portion 62 are respectively perpendicular to the plane formed by the axis of the sleeve body 64, and the first positioning portion 61 and the second positioning portion 62 are both arc-shaped protrusions and their radial outer edge lines are parallel to the axis of the sleeve body 64; the outer edge 65 is formed with the third positioning portion 63 at a position away from the first positioning portion 61 and the second positioning portion 62, and the third positioning portion 63 is a rectangular protrusion, and a fan-shaped notch is provided on one side of the third positioning portion 63.

[0036] The main body 42 of the spring seat 4 is conical, and is integrally formed with six evenly distributed variable diameter structures 43 . The variable diameter structures 43 are rectangular bosses perpendicular to the base portion 41 , and the length of the variable diameter structures 43 gradually increases in the counterclockwise direction of the spring seat 4 .

[0037] The distance between the outer edge 65 of the bottom of the positioning sleeve 6 and the base of the spring seat 4 is 41 mm.

[0038] The distance between the outer edge line of the farthest end of the first positioning portion 61 in the radial direction and the axis of the sleeve 64 is 39 mm; the distance between the outer edge line of the farthest end of the second positioning portion 62 in the radial direction and the axis of the sleeve 64 is 35.5 mm; the central angle of the fan-shaped notch is 38°.

[0039] The width of the diameter-changing structure 43 is 5 mm, and the length thereof ranges from 34 mm to 42 mm.

[0040] The positioning sleeve 6, spring seat 4, brake spring 5 and upper housing 3 in the embodiment of the present invention have high concentricity and good centering, and the assembly is simpler and faster, and the assembly accuracy and assembly efficiency are improved.

[0041] The brake spring positioning structure of the parking brake air chamber can be used for both double-diaphragm brake air chambers and piston brake air chambers. When used for double-diaphragm brake air chambers, an embodiment of the present invention also includes a lower shell 9, a push rod 10, a first return spring, a push rod spring seat, and another membrane 8 crimped between the middle air chamber assembly 1 and the lower shell 9. The middle air chamber assembly includes a brake spindle 7, a spindle spring seat, and a second return spring. The brake spindle 7 is penetrated through the middle of the middle air chamber assembly 1 and abuts against the membrane 2 through the second return spring penetrated thereon and the spindle spring seat provided at its end, and abuts against the other membrane 8 through the spindle spring seat provided at the other end. The push rod 10 abuts against the other membrane 8 through the first return spring penetrated through its end and the push rod spring seat provided at its end. The other membrane 8 and the middle air chamber form a driving cavity. Its working principle is: during service braking, compressed air enters the service chamber, acts on the other diaphragm 8, and compresses the first return spring to push the push rod 10 out. The pressure acting on the other diaphragm 8 acts on the adjusting arm through the connecting rod, generating a braking torque on the wheel; during parking and emergency braking, the compressed air in the parking chamber is fully or partially released, and the brake spring 5 is also fully or partially released, and acts on the wheel brake through the diaphragm 2, the push rod 10 and the brake adjusting arm.

[0042] It should be noted that the detailed description of the technical solution of the present invention by means of the preferred embodiment is illustrative rather than restrictive. A person skilled in the art may modify the technical solution described in the embodiment or replace some of the technical features by equivalents based on reading the specification of the present invention, and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiment of the present invention.

Claims

1. A brake spring positioning structure of a parking brake air chamber, comprising a middle air chamber assembly, a membrane, an upper shell, a spring seat, a brake spring and a positioning sleeve, wherein the membrane is crimped between the upper shell and the middle air chamber assembly and forms a parking cavity with the middle air chamber assembly, characterized in that: The spring seat, the brake spring and the positioning sleeve are concentrically assembled in the chamber formed by the membrane and the upper shell. The inner center of the upper shell has an inwardly concave annular truncated cone. The sleeve body of the positioning sleeve matches the annular truncated cone. The positioning sleeve has a first positioning portion, a second positioning portion and a third positioning portion, and the inner hole of the lower port of the brake spring is positioned and matched through the first positioning portion, the second positioning portion and the third positioning portion. The base portion of the spring seat is disc-shaped and abuts against the membrane, and the main body portion has a plurality of evenly distributed variable diameter structures, and the inner hole of the upper port of the brake spring is positioned and matched through the variable diameter structures. When the brake spring is compressed and the upper end of the positioning sleeve abuts against the variable diameter structure of the spring seat, the distance between the circular outer edge of the bottom of the positioning sleeve and the base portion of the spring seat is greater than the height of the support ring after the brake spring is compressed; The sleeve body of the positioning sleeve is a conical sleeve, the edge of the large end opening of the sleeve body is integrally formed with the outer edge, the edge of the small end opening has a bent portion extending inward, the sleeve body is integrally formed with a first positioning portion and a second positioning portion, and the axis of the first positioning portion and the axis of the second positioning portion are respectively perpendicular to the plane formed by the axis of the sleeve body, and the first positioning portion is integrally formed with the second positioning portion. The first positioning portion and the second positioning portion are both arc-shaped protrusions, and the outer edge lines of the first positioning portion and the second positioning portion are parallel to the axis of the sleeve body; the outer edge is formed with the third positioning portion at a position away from the first positioning portion and the second positioning portion, and the third positioning portion is a rectangular protrusion, and a fan-shaped notch is provided on one side of the third positioning portion; The main body of the spring seat is conical, and is integrally formed with six evenly distributed variable diameter structures, wherein the variable diameter structure is a rectangular boss perpendicular to the base portion, and the length of the variable diameter structure gradually increases in the counterclockwise direction of the spring seat.

2. The brake spring positioning structure of the parking brake chamber according to claim 1, characterized in that: The distance between the outer edge of the bottom of the positioning sleeve and the base of the spring seat is 41 mm.

3. The brake spring positioning structure of the parking brake chamber according to claim 1, characterized in that: The distance between the outer edge line of the farthest end of the first positioning portion in the radial direction and the axis of the sleeve is 39 mm; the distance between the outer edge line of the farthest end of the second positioning portion in the radial direction and the axis of the sleeve is 35.5 mm; the central angle of the fan-shaped notch is 38°.

4. The brake spring positioning structure of the parking brake chamber according to claim 1, characterized in that: The width of the variable diameter structure is 5 mm, and the length ranges from 34 mm to 42 mm.

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