Brake chamber with stroke adjusting function

Abstract

The invention belongs to the technical field of vehicle braking systems, and particularly relates to a brake chamber with a stroke adjusting function. The brake chamber structurally comprises a piston, a strong spring and a middle flange plate, and further comprises a rear end cover unit which is provided with the piston and the strong spring on the inner surface and is clamped with the middle flange plate, and a reverse double-thread column unit which is arranged on the rear end cover unit in a threaded connection mode and used for being connected with the piston in an inserted mode. The reverse double-threaded-column unit is arranged on the piston in an inserted mode, the double-limiting guide sleeve unit is arranged on the piston in an inserted mode and connected with the reverse double-threaded-column unit in a sleeved mode, and the stroke adjusting nut is arranged on the reverse double-threaded-column unit, clamped with the inner side face of the double-limiting guide sleeve unit in the annular direction and used for blocking the piston.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle brake systems, and particularly relates to a brake chamber with stroke adjustment function. BACKGROUND

[0002] The brake chamber refers to a core executive component in a vehicle brake system, and its general principle is to convert compressed air energy into mechanical thrust through a shell and a diaphragm structure to push a brake cam shaft or a push rod, thereby driving brake shoes to open to achieve wheel braking.

[0003] Generally, the brake chamber can be divided into single-cavity and double-cavity types. The former is divided into two independent air chambers by a rubber membrane, is connected to a double-cavity brake valve and the atmosphere, and pushes the push rod under the action of air pressure to realize brake adjustment. The latter mainly adds a piston structure on the basis of the former, and accordingly, in addition to the function of the former driving brake, it also has the functions of parking brake and emergency brake.

[0004] In truck and bus applications, the front axle usually adopts the single-cavity type, and the rear drive axle usually adopts the double-cavity type to achieve comprehensive braking requirements.

[0005] The existing common double-cavity brake chamber mainly includes a front cover, a middle flange plate, a rear cover, a push rod, a rubber membrane, a piston, a guide sleeve, and a strong spring. The rubber membrane is in the front cover to form a driving brake chamber, and the piston is in the rear cover to form a parking brake chamber. The working principle of the double-cavity brake chamber is as follows: First, when parking, the parking brake chamber is not filled with air, the strong spring is fully expanded, directly pushes up the piston and indirectly pushes up the push rod, the push rod pushes the brake arm of the brake, and the brake is completed. Second, when preparing to drive, the parking brake chamber is filled with air, the strong spring is compressed, the push rod is retracted, and the parking brake state is released. Third, when driving brake, the driving brake chamber is filled with air, the rubber membrane is pushed up, directly pushing up the push rod to realize vehicle deceleration.

[0006] For example, the Chinese utility model patent with the authorization announcement number CN222991995U and the authorization announcement date of June 17, 2025 discloses a double-piston brake chamber and a brake chamber kit, which mainly includes a flange plate, a front cylinder cover, a rear cylinder cover, a piston plate, a push rod, a support sleeve, a first spring, a release bolt, a parking piston, and a second spring.

[0007] The double-piston brake chamber in the utility model patent has the advantages of simplifying the overall structure of the double-piston brake chamber and facilitating product miniaturization.

[0008] However, in actual use, this dual-piston brake chamber has at least the following impractical problems: the output stroke of the brake chamber of the same size and specification is not adjustable, and the distance from the starting position of the parking piston structure to the ending position of the other end is fixed. This means that this type of brake chamber can generally only be used with brakes whose extension and retraction dimensions are also fixed and not adjustable, which greatly reduces its practicality. Summary of the Invention

[0009] This application provides a brake chamber with adjustable stroke function. The technical problem to be solved is: how to make the brake stroke of the dual-chamber brake chamber adjustable when it leaves the factory or when it is installed on the vehicle, so as to adapt to brakes of different sizes and specifications with different extension and retraction dimensions.

[0010] The technical solution adopted by this application to solve the above problems is: a brake chamber with adjustable stroke function, the structure of which includes a piston, a strong spring, and a middle flange, and further includes a rear end cover unit on which the piston and the strong spring are disposed on the inner surface and engage with the middle flange, a reverse double threaded column unit screwed onto the rear end cover unit and used to insert the piston, a double limiting guide sleeve unit inserted onto the piston and sleeved with the reverse double threaded column unit, and a stroke adjusting nut disposed on the reverse double threaded column unit and circumferentially engaged with the inner side of the double limiting guide sleeve unit and used to block the piston.

[0011] A further preferred technical solution is that the rear end cover unit includes an end cover body with the piston and a strong spring on its inner surface, a screw plug on the bottom plate of the end cover body, and a threaded hole on the screw plug for installing the reverse double threaded column unit.

[0012] A further preferred technical solution is that the reverse double-threaded column unit includes a column body inserted into the screw plug, piston, and double-limiting guide sleeve unit; an installation threaded section disposed on the column body and used to connect the threaded hole; a nut driving threaded section disposed on the column body with a helical direction opposite to that of the installation threaded section and used to adjust the position of the stroke adjusting nut; and a fastening nut disposed on the column body, located outside the rear end cover unit, and used to clamp the screw plug.

[0013] A further preferred technical solution is that the dual-limiting guide sleeve unit includes a guide sleeve body with the piston and the central flange respectively inserted at both ends, and an inner hexagonal tube disposed on the inner ring surface of the guide sleeve body and used for circumferentially engaging the stroke adjusting nut.

[0014] Further preferably, the technical scheme is characterized in that the sealing and buffering dual-purpose sealing ring is arranged on the opposite side of the double-limiting guide sleeve unit and the piston and used for abutting against the stroke adjusting nut.

[0015] Further preferably, the technical scheme is characterized in that the rear end cover unit further comprises a riveting end arranged on the inner side end of the screw plug and used for adjusting the starting position of the stroke of the piston.

[0016] Further preferably, the technical scheme is characterized in that the rear end cover unit further comprises a cutting surface arranged on the riveting end and used for increasing the adjustment range of the starting position of the stroke of the piston.

[0017] Further preferably, the technical scheme is characterized in that the reverse double-threaded column unit further comprises a hexagonal groove arranged on the outer side end of the column body and used for mounting the column body and adjusting the position of the stroke adjusting nut.

[0018] Further preferably, the technical scheme is characterized in that the one end of the inner hexagonal round tube close to the piston is flush with the guide sleeve body, and the other end is relatively recessed for positioning and mounting the rubber film connecting seat.

[0019] Further preferably, the technical scheme is characterized in that the sealing and buffering dual-purpose sealing ring comprises a sealing outer ring and a blocking inner ring with a thickness greater than the sealing outer ring.

[0020] The beneficial effects of the present application include at least the following six points.

[0021] First, the reverse double-threaded column unit can slide to change the position of the stroke adjusting nut, thereby replacing the middle flange plate to become the end position of the stroke of the piston, so that the brake stroke of the piston is adjustable, and the same brake chamber can be adapted to multiple brakes of different size specifications, improving its practicality.

[0022] Second, the double-limiting guide sleeve unit has the basic function of clamping and limiting the piston and the additional function of fixing the stroke adjusting nut in a ring shape, so that the rotation of the reverse double-threaded column unit can effectively drive the stroke adjusting nut to slide and adjust.

[0023] Third, the rear end cover unit can make the screw plug be flattened through riveting, thereby preliminarily making the starting position of the stroke of the piston also adjustable, further expanding its application range to brakes of various size specifications. After the above riveting, the screw plug can be further reduced in actual thickness through cutting, ensuring that the above beneficial effects and practicality are further improved.

[0024] Fourth, the sealing and buffering dual-purpose sealing ring can obtain a larger sealing size at the end face of the inner hexagonal circular tube, and can provide elastic buffering for the action of the stroke adjusting nut to block the piston, further improving the safety and comfort of the above-mentioned stroke adjusting function.

[0025] Fifth, the reverse double-threaded column unit combined with the stroke adjusting nut can completely replace the release bolt in the prior art, so that the piston can be actively retracted on demand, thereby releasing the braking state, and is suitable for emergency state. Correspondingly, one of the structures of the brake chamber is that no release bolt is arranged on the rear end cover unit.

[0026] Sixth, compared with the prior art in which the front end of the release bolt is a fixed block, the reverse double-threaded column unit combined with the stroke adjusting nut can make the operation of the release return spring faster and more efficient by the relative movement of the latter. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present application.

[0028] Figure 2 It is a position schematic diagram of the present application in the position of the fastening nut.

[0029] Figure 3 It is a sectional structure schematic diagram of the present application.

[0030] Figure 4 It is a structure schematic diagram of the reverse double-threaded column unit in the present application.

[0031] Figure 5 It is a structure schematic diagram of the double-limiting guide sleeve unit in the present application.

[0032] Figure 6 It is a position shape schematic diagram of the radial protruding strip in the present application.

[0033] Figure 7 It is a position shape schematic diagram of the riveting end in the present application.

[0034] Figure 8 It is a position schematic diagram of the cutting surface in the present application.

[0035] Figure 9 It is a schematic diagram of the release mode of the braking state of the present application.

[0036] Figure 10 It is a position shape schematic diagram of the sealing and buffering dual-purpose sealing ring in the present application.

[0037] Figure 11 It is a structure schematic diagram of the plug in the present application.

[0038] Figure 12Figure 1 is a schematic diagram of the mounting method of the rubber film connecting seat against the inner hexagonal round pipe in the present application.

[0039] In the figure, the meaning of each mark is as follows.

[0040] Cutting part a; Piston 11, strong spring 12, middle flange plate 13, rubber film connecting seat 14, rubber film 15; Rear end cover unit 1, reverse double threaded column unit 2, double limiting guide sleeve unit 3, stroke adjusting nut 4, sealing and buffering dual-purpose sealing ring 5; End cover body 101, screw plug 102, threaded hole 103, riveting end 104, cutting surface 105; Column body 201, mounting threaded section 202, nut driving threaded section 203, fastening nut 204, hexagonal groove 205; Guide sleeve body 301, inner hexagonal round pipe 302, radial protruding strip 303; Sealing outer ring 5-1, blocking inner ring 5-2. DETAILED DESCRIPTION

[0041] The following description is only a preferred embodiment of the present application, and does not limit the scope of the present application.

[0042] As Figures 1-12 shown, a brake chamber with stroke adjustable function, the structure includes piston 11, strong spring 12, and middle flange plate 13, also includes rear end cover unit 1 provided with piston 11 and strong spring 12 on the inner surface, and clamped with middle flange plate 13, reverse double threaded column unit 2 screw connected on the rear end cover unit 1, and used for inserting piston 11, double limiting guide sleeve unit 3 inserted on the piston 11, and sleeved with reverse double threaded column unit 2, and stroke adjusting nut 4 provided on the reverse double threaded column unit 2, and clamped with the inner side of double limiting guide sleeve unit 3, and used for blocking piston 11.

[0043] In the embodiment, the brake chamber belongs to double cavity type, and the relative specific structure mainly includes: front end cover, push rod, rubber film 15, return spring, middle flange plate 13, rubber film connecting seat 14, rear end cover unit 1, double limiting guide sleeve unit 3, piston 11, strong spring 12, reverse double threaded column unit 2, and stroke adjusting nut 4.

[0044] Among them, the front end cover, rubber film 15 and middle flange plate 13 are buckled, sealed and connected, and the middle flange plate 13 is clamped with the rear end cover unit 1, that is, sealed and connected, which ensures that the brake chamber has sufficient external sealing property.

[0045] On the other hand, the five parts of the push rod, the rubber film 15, the rubber film connecting seat 14, the double-limiting guide sleeve unit 3 and the piston 11 slide as a whole, and as the driving operation part of the brake chamber, the brake state can be directly triggered and released.

[0046] The strong spring 12 is a conventional name in the prior art, and the word "strong" mainly refers to the fact that the elastic strength of the strong spring is greater than that of the return spring. For example, the compression force is usually as high as 800-2000 N, which is much higher than that of the return spring. When the compressed air pipeline is broken, the state of the brake chamber is that the elastic force of the strong spring 12 overcomes the elastic force of the return spring, and then the push rod is extended to trigger the brake state, thereby ensuring the safety of the vehicle. The strong spring 12 can also be called a parking spring.

[0047] In addition, the brake chamber obtains the first brake stroke adjustment effect by the following method.

[0048] The reverse double-thread column unit 2 is screwed with the rear end cover unit 1 and the stroke adjusting nut 4, and the rotation directions of the threaded segments thereon are opposite. Therefore, with the reverse double-thread column unit 2 as a reference, the tightening process of the reverse double-thread column unit 2 on the rear end cover unit 1 is that the rear end cover unit 1 is close to it and the stroke adjusting nut 4 is far away from it. Finally, the position of the stroke adjusting nut 4 is moved to the front end, i.e., relatively close to the side of the middle flange plate 13, which can be specifically referred to in the attached drawings. Figure 9 The stroke adjusting nut 4 replaces the middle flange plate 13, and then becomes the stroke end point of the piston 11, which is feasible and ensures the brake stroke adjustment.

[0049] Correspondingly, the stroke adjusting nut 4 is circumferentially limited in the above process, which is one of the necessary conditions. The double-limiting guide sleeve unit 3 cannot rotate by itself and is circumferentially clamped with the stroke adjusting nut 4, which is one of the implementation manners of the above necessary conditions.

[0050] Finally, the brake chamber makes the stroke size adjustable by changing the position of the stroke end point of the piston 11, and then matches various types of brakes of different size specifications, which is very practical and efficient. For example, the maximum stroke of the brake chamber is 45 mm, i.e., the stroke end point of the piston 11 is against the middle flange plate 13, and when the stroke adjusting nut 4 is appropriately shifted backward, the above stroke can be set to 42 mm or 40 mm.

[0051] It needs to be particularly pointed out that: First, the stability of the stroke adjusting nut 4 blocking the fixed piston 11 is not as good as the middle flange 13 blocking the fixed piston 11, so the above-mentioned stroke adjusting mode can be used as an emergency, but this does not deny the practicality of the brake chamber, and the brake chamber can still use the middle flange 13 as the end position of the stroke of the piston 11. Second, the above-mentioned adjustable function refers to the adjustable brake stroke before the vehicle runs, and the brake stroke is fixed when the brake chamber and the brake are installed, that is, when the vehicle runs.

[0052] The rear end cover unit 1 includes an end cover body 101 provided with the piston 11 and the strong spring 12 on the inner surface, a plug 102 arranged on the bottom plate of the end cover body 101, and a threaded hole 103 arranged on the plug 102 and used for installing the reverse double threaded column unit 2.

[0053] In this embodiment, the material of the end cover body 101 is carbon steel, and the general shape is a barrel shape. A sealing ring is arranged between the piston 11 and the inner ring surface thereof. One end of the strong spring 12 abuts against the inner side end surface thereof, and a circular hole for installing the plug 102 is arranged at the center position of the end plate.

[0054] On the other hand, the main function of the plug 102 is: First, the circular hole is not threaded, which greatly reduces the difficulty of hole forming process; Second, the length of the plug 102 is 2-3 times the thickness of the above-mentioned end plate, which can provide a longer threaded section for the reverse double threaded column unit 2, thereby reducing the probability of thread slipping accident of the reverse double threaded column unit 2.

[0055] The reverse double threaded column unit 2 includes a column body 201 inserted and arranged on the plug 102, the piston 11 and the double limiting guide sleeve unit 3, an installation threaded section 202 arranged on the column body 201 and used for connecting the threaded hole 103, a nut driving threaded section 203 arranged on the column body 201 and having a screw direction opposite to that of the installation threaded section 202, and used for adjusting the position of the stroke adjusting nut 4, and a fastening nut 204 arranged on the column body 201 and located outside the rear end cover unit 1, and used for clamping the plug 102.

[0056] In this embodiment, the brake chamber takes the push rod side as the front end and the reverse double threaded column unit 2 side as the rear end. The nut driving threaded section 203 is located at the relatively front end compared with the installation threaded section 202.

[0057] The installation method of the reverse double threaded column unit 2 is as follows: First, the piston 11, strong spring 12 and double limit guide sleeve unit 3 are installed first, and the double limit guide sleeve unit 3 is appropriately pressed to make it close to the screw plug 102; Second, the stroke adjusting nut 4 is fully screwed on the nut driving threaded section 203, for example, the size is 2 times the thickness of the former; Third, the column 201 is rotated, so that the installation threaded section 202 fully screws the threaded hole 103; Fourth, the stroke adjusting nut 4 is rotated alone, so that it can be clamped into the double limit guide sleeve unit 3, at this time the stroke adjusting nut 4 can replace the middle flange 13 and become the stroke end position of the piston 11; Fifth, under the premise that the threaded hole 103 and the installation threaded section 202 are fully screwed, and the exposed length of the column 201 is sufficient, the exposed end of the column 201 can be rotated in both directions, so that the position of the stroke adjusting nut 4 is adjusted forward and backward, and finally the stroke end position of the piston 11 is adjusted, at this time the stroke adjusting nut 4 is relatively close to the front, and its blocking effect on the piston 11 is not triggered.

[0058] Among them, the column 201 is a cylinder, its length is greater than the depth of the end cover body 101, the installation threaded section 202 and the nut driving threaded section 203 are opened from the end of the column 201, both of which occupy at least 1 / 3 of the length of the column 201. The number of fastening nuts 204 is 2, which relatively increases the strength of clamping the screw plug 102 after being stacked, so that the reverse double threaded column unit 2 is not easy to rotate loose during normal use of the brake chamber.

[0059] Generally, the replacement period of the brake chamber is the shortest for the rubber film 15, and the replacement method is generally as follows: First, the entire brake chamber is removed from the automobile brake system, and the compressed air pipeline is removed, at this time the strong spring 12 is completely expanded, the rubber film 15 is greatly lifted, and is completely or almost attached to the inner wall of the front end cover, at this time the return spring is completely compressed, so the operation of removing the front end cover is very dangerous; Second, the column 201 is rotated outward, taking the outer side end of the column 201 as a reference, the screw plug 102 is away from the end, the stroke adjusting nut 4 is close to the end, and the backward withdrawal action of the column 201 itself is added, so that the stroke adjusting nut 4 can quickly pull the piston 11 backward, and at the same time, the strong spring 12 is compressed and the return spring is released; Third, the piston 11 does not need to be pulled back to the bottom, ensuring that the return spring, for example, releases half the distance of its stroke, at which point the front end cover can be safely removed and the rubber membrane 15 replaced, which is another function of the reverse double threaded column unit 2, corresponding to the above-mentioned advantage of replacing the release bolt in the prior art.

[0060] It needs to be specially pointed out that: the stroke adjusting nut 4 itself can move on the column body 201, so compared with the prior art, the front end of the release bolt is fixed block, the reverse double threaded column unit 2 compresses the strong force spring 12 and releases the return spring faster, which is very practical and efficient.

[0061] The double limiting guide sleeve unit 3 includes a guide sleeve body 301 inserted into the piston 11 and the middle flange plate 13 at both ends, and an inner hexagonal pipe 302 arranged on the inner ring surface of the guide sleeve body 301 and used for ring-shaped clamping of the stroke adjusting nut 4.

[0062] In this embodiment, the hexagonal inner side surface of the inner hexagonal pipe 302 is used for ring-shaped clamping of the stroke adjusting nut 4, which is a common hexagonal nut.

[0063] In addition, the front end inner ring surface of the guide sleeve body 301 is connected to the rubber membrane connecting seat 14, and the outer ring surface is clamped to the middle flange plate 13; the rear end outer ring surface is clamped to the piston 11, which can be referred to in detail in the accompanying drawings. Figure 9 In the ring direction, the rubber membrane 15, the double limiting guide sleeve unit 3 and the piston 11 cannot rotate.

[0064] Among them, the guide sleeve body 301 and the inner hexagonal pipe 302 are integrally formed.

[0065] The structure of the brake chamber further includes a sealing and buffering dual-purpose sealing ring 5 arranged on the opposite side surfaces of the double limiting guide sleeve unit 3 and the piston 11 and used for abutting against the stroke adjusting nut 4.

[0066] In this embodiment, there are rubber sealing rings between the middle flange plate 13 and the end cover body 101, between the end cover body 101 and the piston 11, between the piston 11 and the guide sleeve body 301, and between the guide sleeve body 301 and the middle flange plate 13, thereby ensuring the air tightness of the parking brake chamber.

[0067] Among them, the sealing and buffering dual-purpose sealing ring 5 is always indirectly and fully pressed on the rear side end surface of the guide sleeve body 301 by the strong force spring 12, avoiding air leakage at this position.

[0068] And the "buffer" word, refers to its can replace the piston 11, as the piston stroke end position limiting point by the stroke adjusting nut 4 against, avoid the stroke adjusting nut 4 and piston 11 between the relative harmful metal knock.

[0069] Need to be particularly pointed out: First, the buffer part of the sealing and buffering dual-purpose sealing ring 5, even if broken off, failure, can be compensated by the way of adjusting the stroke adjusting nut 4 backward, the thickness size of the empty place; Second, the above buffer part broken, does not affect the sealing effect of the sealing and buffering dual-purpose sealing ring 5.

[0070] The rear end cover unit 1 also includes the riveting end 104 arranged on the inner side end of the screw plug 102 and used for adjusting the stroke start position of the piston 11.

[0071] In this embodiment, the riveting end 104 is formed by flattening and knocking the inner side end of the screw plug 102 appropriately, so that the protruding size originally located inside the end cover body 101 is reduced, for example, from the original 5mm to 3mm.

[0072] The function of the riveting end 104 is mainly: First, the hole for mounting the screw plug 102 on the end cover body 101 is a light hole, which can not have threads, greatly reducing the difficulty of the hole; Second, when the hole is a screw hole, the riveting end 104 can further improve the installation stability of the screw plug 102; Third, the piston 11 is not completely rigid, and the riveting end 104 can at least provide a more rear start position for the center part of the piston 11, and finally provide a more rear start position for the push rod; Fourth, the above brake stroke adjustment effect not only adds the start position adjustment function, but also adds the stroke upper limit improvement function.

[0073] The rear end cover unit 1 also includes the cutting surface 105 arranged on the riveting end 104 and used for increasing the stroke start position adjustment range of the piston 11.

[0074] In this embodiment, the cutting operation corresponding to the cutting surface 105 is a further optimization of the riveting operation. Under the premise of ensuring the installation stability of the screw plug 102 is sufficient, the cutting operation can further improve the maximum stroke by 1-2mm, further improving the practicability and flexibility of the brake chamber.

[0075] As shown in FIG. 1, the brake chamber 1 includes a rear end cover unit 1 and a piston 11 arranged in the rear end cover unit 1. Figure 8As shown, the cutting part a is removed and not used in the brake chamber, and can be recycled for use.

[0076] The reverse double thread column unit 2 further comprises a hexagonal groove 205 arranged on the outer side end of the column 201 and used for mounting the column 201 and adjusting the position of the stroke adjusting nut 4.

[0077] In the embodiment, the main function of the hexagonal groove 205 is: First, when the column 201 is rotated to adjust the forward and backward positions of the stroke adjusting nut 4, the rotation operation is more simple and convenient; Second, when the forward and backward positions of the stroke adjusting nut 4 are adjusted and the two fastening nuts 204 need to be tightened again, the column 201 can be relatively simply fixed to avoid rotation.

[0078] The end of the inner hexagonal round pipe 302 close to the piston 11 is flush with the guide sleeve body 301, and the other end is relatively retracted for positioning and mounting the rubber film connecting seat.

[0079] In the embodiment, the rubber film connecting seat 14 and the guide sleeve body 301 are circumferentially fixed, and the side end face of the inner hexagonal round pipe 302 can make the insertion and mounting of the rubber film connecting seat 14 more simple and accurate by abutting against the rubber film connecting seat 14.

[0080] The sealing and buffering dual-purpose sealing ring 5 comprises a sealing outer ring and a blocking inner ring with a thickness greater than the sealing outer ring.

[0081] In the embodiment, the sealing outer ring 5-1 and the blocking inner ring 5-2 are integrally formed, but the rubber materials of the two can be different, for example, the former is nitrile rubber with outstanding sealing performance, and the latter is ethylene-propylene-diene rubber with outstanding impact resistance.

[0082] On the other hand, the piston 11 and the column 201, and the column 201 and the threaded hole 103 do not need to have air tightness. The opening in the center of the piston 11 for passing through the column 201 can be relatively large in size to avoid wear of the piston 11 and the column 201.

[0083] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the purpose of the application. These are not creative modifications, and are protected by the patent law within the scope of the claims of the application.

Claims

1. A brake chamber with adjustable stroke function, comprising a piston (11), a strong spring (12), and a central flange (13), characterized in that: It also includes a rear end cover unit (1) with the piston (11) and a strong spring (12) on its inner surface and engaged with the middle flange (13); a reverse double thread column unit (2) screwed onto the rear end cover unit (1) and used to insert the piston (11); a double limiting guide sleeve unit (3) inserted onto the piston (11) and sleeved with the reverse double thread column unit (2); and a stroke adjusting nut (4) disposed on the reverse double thread column unit (2) and circumferentially engaged with the inner side of the double limiting guide sleeve unit (3) and used to block the piston (11).

2. A brake chamber with adjustable stroke function according to claim 1, characterized in that: The rear end cover unit (1) includes an end cover body (101) with the piston (11) and a strong spring (12) on its inner surface, a screw plug (102) on the bottom plate of the end cover body (101), and a threaded hole (103) on the screw plug (102) for installing the reverse double threaded column unit (2).

3. A brake chamber with adjustable stroke function according to claim 2, characterized in that: The reverse double-threaded column unit (2) includes a column (201) inserted into the plug (102), piston (11) and double-limiting guide sleeve unit (3), an installation threaded section (202) disposed on the column (201) and used to connect the threaded hole (103), a nut driving threaded section (203) disposed on the column (201) with the helical direction opposite to the installation threaded section (202) and used to adjust the position of the stroke adjusting nut (4), and a fastening nut (204) disposed on the column (201) and located outside the rear end cover unit (1) and used to clamp the plug (102).

4. A brake chamber with adjustable stroke function according to claim 1, characterized in that: The double-limiting guide sleeve unit (3) includes a guide sleeve body (301) with the piston (11) and the middle flange (13) respectively inserted at both ends, and an inner hexagonal tube (302) disposed on the inner ring surface of the guide sleeve body (301) and used for circumferentially engaging the stroke adjusting nut (4).

5. A brake chamber with adjustable stroke function according to claim 1, characterized in that: It also includes a sealing and buffer dual-purpose sealing ring (5) disposed on the opposite side of the double limit guide sleeve unit (3) and the piston (11) and used to abut against the stroke adjusting nut (4).

6. A brake chamber with adjustable stroke function according to claim 2, characterized in that: The rear end cover unit (1) also includes a riveting end (104) disposed on the inner end of the screw plug (102) and used to adjust the stroke start position of the piston (11).

7. A brake chamber with adjustable stroke function according to claim 6, characterized in that: The rear end cover unit (1) also includes a cutting surface (105) disposed on the riveting end (104) and used to increase the adjustment range of the stroke starting position of the piston (11).

8. A brake chamber with adjustable stroke function according to claim 3, characterized in that: The reverse double thread column unit (2) also includes a hexagonal groove (205) disposed on the outer end of the column (201) and used for mounting the column (201) and adjusting the position of the stroke adjusting nut (4).

9. A brake chamber with adjustable stroke function according to claim 4, characterized in that: The end of the inner hexagonal tube (302) near the piston (11) is flush with the guide sleeve body (301), while the other end is recessed to position and install the rubber diaphragm connector.

10. A brake chamber with adjustable stroke function according to claim 5, characterized in that: The dual-purpose sealing ring (5) includes a sealing outer ring and a blocking inner ring with a thickness greater than that of the sealing outer ring.

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