A middle body assembly and a brake chamber comprising the same

Abstract

The application belongs to the technical field of vehicle braking system, and particularly relates to a middle body assembly and a brake chamber comprising the same. The structure of the middle body assembly comprises a middle body provided with a middle body hole, a tappet, a sealing ring mounting groove arranged on the middle body hole, two guide ring mounting grooves arranged on the middle body hole and respectively located at positions on two sides of the sealing ring mounting groove, a sealing ring unit arranged on the sealing ring mounting groove, and an open guide ring unit arranged on the guide ring mounting groove and used for clamping the tappet. The application has at least the following beneficial effects: in the middle body assembly, the two open guide ring units and the one sealing ring unit all have respective corresponding mounting groove structures, the former separates the middle body and the tappet, and the latter seals and isolates the brake cavity and the parking cavity, so that the assembly has the double advantages that the middle body and the tappet are not easy to wear and the sealing ring unit is stably mounted.

Description

Technical Field

[0001] This application belongs to the field of vehicle braking system technology, and particularly relates to a mid-body component and a brake chamber including the component. Background Technology

[0002] A brake chamber, generally speaking, refers to the air pressure-to-mechanical thrust conversion device used in a vehicle braking system to perform the braking operation. Based on differences in structure and working principle, brake chambers are mainly divided into two types: single-chamber and dual-chamber. For example, in trucks and buses, the front axle often uses the single-chamber type, while the rear drive axle often uses the dual-chamber type to achieve a combined braking effect.

[0003] The aforementioned single-chamber brake chamber has a relatively simple structure, mainly consisting of a front cover, a rear cover, a diaphragm, a push rod, and a return spring. The working principle of the single-chamber brake chamber is as follows: when the vehicle needs to brake, air is inflated between the diaphragm and the rear cover, causing the air pressure to overcome the elastic force of the return spring. This then pushes the push rod outward, thereby actuating the brakes and triggering the braking effect.

[0004] On the other hand, the aforementioned dual-chamber brake chamber mainly consists of: a front cover, a middle body, a rear cover, a brake chamber diaphragm, a parking chamber diaphragm, a push rod, a return spring, a tappet, and a parking spring. The parking spring has a much greater elastic strength than the return spring; therefore, the former can also be called a high-strength spring. The working principle of this dual-chamber brake chamber is roughly as follows:

[0005] First, when parking, there is no air between the middle body and the diaphragm of the parking cavity, the parking spring is fully extended, directly pushing up the push rod and indirectly pushing up the push rod, thereby triggering the braking effect;

[0006] Second, when preparing to drive, air is inflated between the diaphragm of the middle body and the parking chamber, the parking spring is compressed, the push rod is retracted, and the parking brake is released.

[0007] Third, when it is necessary to decelerate during driving, the working principle of the brake diaphragm is similar to that of the single-chamber brake chamber mentioned above, thereby ultimately achieving the effect of vehicle deceleration and braking.

[0008] Accordingly, the aforementioned middle body assembly mainly includes the middle body and the pushrod. The aforementioned front cover, brake chamber diaphragm, return spring, and pushrod constitute the main structure of the brake chamber assembly; the aforementioned rear cover, parking chamber diaphragm, and parking spring constitute the main structure of the parking chamber assembly.

[0009] For example, the utility model patent with authorization announcement number CN 223164916 U and authorization announcement date of 2025.07.29 discloses a middle body assembly of a double diaphragm disc brake chamber. The structure of this assembly mainly includes: a middle body, a receiving groove, a tappet, a first tappet disc, a second tappet disc, a bushing, a sealing ring, a bushing buckle, an elastic plate, a limiting block, a slot, and an inclined surface.

[0010] The advantages of the middle body component in this utility model patent are mainly: by setting a sealing component, the hard friction between the push rod and the inner hole of the middle body is reduced, thus extending the service life of the product.

[0011] However, in actual use, this component still suffers from at least the following shortcomings in practicality and poor stability, specifically:

[0012] The stability of the overall structure composed of the bushing, sealing ring and bushing buckle is achieved and guaranteed entirely by the contact effect between the limiting block and the slot. This is not stable enough, as the limiting block itself is relatively small and cannot withstand the three components that all tend to slide. Summary of the Invention

[0013] This application provides a middle body assembly, the technical problem to be solved by which the airtight structure between the middle body hole and the push rod has the dual advantages of sufficient isolation between the middle body and the push rod, and stable installation itself.

[0014] In addition, this application also provides a brake chamber including the above-mentioned middle body component.

[0015] The technical solution adopted by this application to solve the above problems is: a middle body assembly, the structure of which includes a middle body with a middle body hole, a push rod, a sealing ring mounting groove disposed on the middle body hole, two guide ring mounting grooves disposed on the middle body hole and respectively located on both sides of the sealing ring mounting groove, a sealing ring unit disposed on the sealing ring mounting groove, and an open guide ring unit disposed on the guide ring mounting groove and used to engage the push rod.

[0016] A further preferred technical solution is that the guide ring mounting groove includes a bidirectional engaging groove disposed on the central body hole, and a side groove disposed on the central body hole and the side surface of the central body.

[0017] A further preferred technical solution is that the open guide ring unit includes a protruding ring disposed on the bidirectional engaging groove, a side ring disposed on the side groove, a main body ring disposed on the protruding ring and the side ring and used for engaging the push rod, and an inwardly recessed mounting opening disposed on the protruding ring, the side ring and the main body ring.

[0018] A further preferred technical solution is that the sealing ring unit includes a sealing ring main ring disposed in the sealing ring mounting groove, a central main protrusion ring and two side secondary protrusion rings disposed on the inner ring surface of the sealing ring main ring and used to clamp the push rod, and three pressure rings disposed on the outer surface of the sealing ring main ring and used to respectively press the central main protrusion ring and the two side secondary protrusion rings.

[0019] A further preferred technical solution is that the sealing ring unit also includes a groove disposed on the side of the main sealing ring, and which reduces the difficulty of the secondary protruding ring on the side to deform to both sides when the push rod reciprocates, so as to radially pull the deformation of the main protruding ring inward and cut a groove thereafter.

[0020] A further preferred technical solution is that: before the sealing ring unit is used, the open guide ring unit uses the protruding ring to engage with the primary and secondary protruding ring spacing groove to support the sealing ring unit radially outward, and to assemble the sealing ring unit and the two open guide ring units.

[0021] A further preferred technical solution is that: before the sealing ring unit is used, the open guide ring unit engages with the deformed groove through the side ring to support the sealing ring unit radially outward, and to assemble the sealing ring unit and the two open guide ring units.

[0022] A further preferred technical solution is that the cross-sectional shape of the central main protruding ring is an isosceles triangle, and the cross-sectional shape of the side secondary protruding ring is a right triangle, with the right angle set on the side close to the groove after deformation.

[0023] A brake chamber includes the middle body assembly, and the structure further includes a brake chamber diaphragm connecting plate and a parking chamber diaphragm abutting plate respectively disposed at both ends of the pushrod, and a positioning groove disposed on the middle body, communicating with one of the guide ring mounting grooves, and used to engage the brake chamber diaphragm connecting plate.

[0024] A further preferred technical solution includes a thickened ring disposed on the side ring of one of the opening guide ring units and used to buffer the brake chamber diaphragm connecting disc during reciprocating sliding.

[0025] The beneficial effects of this application include at least the following seven points.

[0026] First, in this middle body assembly, the two open guide ring units and the one sealing ring unit each have their own corresponding mounting groove structure. The former separates the middle body and the pushrod, while the latter seals and isolates the brake chamber and the parking chamber. This makes the assembly have the dual advantages of the middle body and pushrod being less prone to wear, and the sealing ring unit being installed securely.

[0027] Secondly, the open guide ring unit, through its inward-reducing structure for installation, combines the advantages of simple installation and sufficient stability after installation in its mounting state on the guide ring mounting groove. This allows the protruding ring and side ring to have sufficient stability by using their relatively large size, making it difficult for them to fall off spontaneously.

[0028] Third, the sealing ring unit is an irregularly shaped sealing ring. Compared with the commonly used O-rings, it has at least the following three advantages: 1. The central main protruding ring and the side secondary protruding ring are used together, which can achieve sufficient airtightness through a relatively small contact area with the push rod. If the O-ring is used in this position, it will wear out quickly due to the excessive contact area; 2. The side secondary protruding ring can increase the airtightness of the central main protruding ring by pulling it radially inward, and the airtightness of the side secondary protruding ring is also increased, which further improves the airtightness; 3. The groove after deformation can further enhance the above-mentioned "radial inward pulling" effect, which further improves the overall airtightness.

[0029] Fourth, the central main protruding ring and the side secondary protruding ring also have the outstanding advantage of "one thing serving two purposes", that is: before the sealing ring unit is used, the protruding ring engages with the main and secondary protruding ring interval groove, so that the open guide ring unit radially supports the sealing ring unit, and one sealing ring unit and two open guide ring units are assembled, which facilitates subsequent installation and use.

[0030] Fifth, the groove after deformation also has the outstanding advantage of "one thing, two uses", that is: before the sealing ring unit is used, the side ring engages with the groove after deformation, so that the open guide ring unit can radially support the sealing ring unit, and one sealing ring unit and two open guide ring units can be assembled, which is convenient for subsequent installation and use.

[0031] Sixth, in this brake chamber, the positioning groove can further improve the stability of the reciprocating sliding motion of the brake chamber diaphragm.

[0032] Seventh, in this brake chamber, the thickened ring can buffer and protect the brake chamber diaphragm connecting plate, avoiding frequent and large-scale impacts between the brake chamber diaphragm connecting plate and the middle body, and the above-mentioned buffering effect will not have a significant impact on the limiting and guiding effect of the open guide ring unit. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the body component in this application.

[0034] Figure 2 This is a schematic diagram of the shape of the body in this application.

[0035] Figure 3 This is a schematic diagram showing the location of the sealing ring mounting groove in this application.

[0036] Figure 4 This is a schematic diagram of the sealing ring unit in this application.

[0037] Figure 5 This is a schematic diagram of the structure of the open guide ring unit in this application.

[0038] Figure 6 This is a schematic diagram showing the location and shape of the guide ring mounting groove in this application.

[0039] Figure 7 This is a schematic diagram showing the positions of the brake chamber diaphragm connecting disc and the parking chamber diaphragm abutment disc in this application.

[0040] Figure 8 This is a schematic diagram showing the location and shape of the thickened ring in this application.

[0041] Figure 9 This is a schematic diagram illustrating the engagement method of the protruding rings on the primary and secondary protruding ring spacer grooves in this application.

[0042] Figure 10 This is a schematic diagram of the engagement method of the side ring on the groove after deformation in this application.

[0043] Figure 11 This is a schematic diagram illustrating the principle of how the secondary protruding ring on the side pulls the main protruding ring in the middle radially inward in this application.

[0044] Figure 12 This is a schematic diagram illustrating the usage of the open guide ring unit in this application, which is nested on the sealing ring unit by means of the deformation function at the inner recess position of the mounting.

[0045] The meanings of the markings in the diagram are as follows.

[0046] Position a of the secondary lateral protruding ring after deformation; Position b of the main central protruding ring after being pulled inward.

[0047] Middle body 11, middle body hole 11-1, tappet 12;

[0048] 1. Sealing ring mounting groove; 2. Guide ring mounting groove; 3. Sealing ring unit; 4. Open guide ring unit.

[0049] Two-way engagement groove 201, side groove 202;

[0050] 401 protruding ring, 402 side ring, 403 main body ring, 404 mounting recess;

[0051] The sealing ring consists of a main ring 301, a central main protruding ring 302, a side secondary protruding ring 303, a pressure ring 304, a groove after deformation 305, and a main and secondary protruding ring spacing groove 306.

[0052] 5. Brake chamber diaphragm connecting plate; 6. Parking chamber diaphragm abutment plate; 7. Positioning groove; 8. Thickened ring; 9. Auxiliary spring. Detailed Implementation

[0053] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0054] like Figures 1-12 As shown, a middle body assembly includes a middle body 11 with a middle body hole 11-1, a push rod 12, a sealing ring mounting groove 1 disposed on the middle body hole 11-1, two guide ring mounting grooves 2 disposed on the middle body hole 11-1 and respectively located on both sides of the sealing ring mounting groove 1, a sealing ring unit 3 disposed on the sealing ring mounting groove 1, and an open guide ring unit 4 disposed on the guide ring mounting groove 2 and used to engage the push rod 12.

[0055] In this embodiment, the main body of both the middle body 11 and the push rod 12 is made of aluminum alloy. The sealing ring unit 3 is made of any one of nitrile rubber, fluororubber, or silicone rubber. The open guide ring unit 4 is made of nylon, specifically, for example, PA66 nylon 66 or MC nylon cast nylon, both of which have outstanding wear resistance, mechanical strength, and dimensional stability.

[0056] The surface of the push rod 12 is plated with a chromium layer in accordance with existing technology to achieve basic wear resistance and low coefficient of friction. However, if the push rod 12 is in direct contact with the central body hole 11-1, frictional wear cannot be ignored during long-term, high-intensity relative sliding use, which will significantly reduce the service life of the entire central body assembly. This is the main reason for setting the open guide ring unit 4.

[0057] On the other hand, the basis for this component's dual advantages of sufficient isolation between the central body 11 and the strut 12, as well as its stable installation due to its airtight structure, mainly includes the following three points:

[0058] First, there are two open guide ring units 4, located at both ends of the middle body hole 11-1, and they completely block the middle body 11 and the push rod 12 in the radial direction of the middle body hole 11-1. Therefore, the middle body 11 is in principle free from the risk of sliding wear. As for the push rod 12, the wear between the chrome plating layer on it and the nylon open guide ring unit 4 is rapid, much less than the existing method of directly removing the middle body hole 11-1. Therefore, the middle body 11 and the push rod 12 are fully protected.

[0059] Secondly, the two open guide ring units 4 mentioned above are respectively engaged and installed on the two guide ring mounting slots 2, thus ensuring their stable installation.

[0060] Third, the aforementioned sealing ring unit 3 also occupies its own installation space, namely the sealing ring mounting groove 1. The opening guide ring unit 4 does not need to limit or block the sealing ring unit 3. Any harmful displacement that may occur on the sealing ring unit 3, whether left or right, cannot be transmitted to the opening guide ring unit 4. Therefore, the entire airtight structure is installed stably.

[0061] Furthermore, the central hole 11-1 is circular in shape, and the "open" designation of the open guide ring unit 4 refers to its shape as a broken circular ring; otherwise, due to the relatively low elasticity of nylon, it would be impossible to effectively install it on the guide ring mounting groove 2. Conversely, the sealing ring unit 3 has relatively high elasticity, sufficient to effectively install itself at the sealing ring mounting groove 1 after deformation, therefore its shape is a complete circular ring.

[0062] Finally, the diameter of the central hole 11-1 is larger than that of the push rod 12, which mainly provides sufficient radial space for the opening guide ring unit 4 to ensure that the radial thickness of the blocking area of ​​the opening guide ring unit 4 is sufficient.

[0063] The guide ring mounting groove 2 includes a bidirectional engaging groove 201 disposed on the middle body hole 11-1, and a side groove 202 disposed on the middle body hole 11-1 and the side of the middle body 11.

[0064] In this embodiment, the cross-sectional shape of the bidirectional engaging groove 201 is an isosceles triangle, and the cross-sectional shape of the side groove 202 is rectangular, with the former positioned relatively inward. Correspondingly, the overall shape of the open guide ring unit 4 corresponds to an "L" shape, thereby ensuring sufficient installation stability and moderate disassembly and assembly difficulty for the open guide ring unit 4 on the guide ring mounting groove 2.

[0065] The open guide ring unit 4 includes a protruding ring 401 disposed on the bidirectional engaging groove 201, a side ring 402 disposed on the side groove 202, a main body ring 403 disposed on the protruding ring 401 and the side ring 402 and used for engaging the push rod 12, and an inwardly recessed opening 404 for mounting disposed on the protruding ring 401, the side ring 402 and the main body ring 403.

[0066] In this embodiment, the central angle of the inner recess 404 for installation is 30-60°. That is, while ensuring that the inner deformation range is sufficient for its own disassembly and assembly, the circumferential length is made as large as possible, thereby providing a more stable radial limiting effect for the push rod 12, and making the linear characteristics of the reciprocating sliding action of the push rod 12 more prominent.

[0067] The single opening guide ring unit 4 is integrally formed, and the cross-sectional shape of the protruding ring 401, the side ring 402 and the main ring 403 is, for example, an isosceles triangle, a rectangle and another rectangle.

[0068] The sealing ring unit 3 includes a sealing ring main ring 301 disposed in the sealing ring mounting groove 1, a central main protruding ring 302 and two side secondary protruding rings 303 disposed on the inner ring surface of the sealing ring main ring 301 and used to clamp the push rod 12, and three pressure rings 304 disposed on the outer surface of the sealing ring main ring 301 and used to respectively press the central main protruding ring 302 and the two side secondary protruding rings 303.

[0069] In this embodiment, each sealing ring unit 3 is also integrally formed, and it belongs to the category of irregular-shaped sealing rings. Compared with the commonly used O-rings, the sealing ring unit 3 has at least the following three outstanding advantages:

[0070] First, one central main protruding ring 302 and two side secondary protruding rings 303 are used together, so that sufficient air tightness can be achieved through a relatively small contact area with the push rod 12. If the O-ring is used in this place, it will wear out quickly due to the excessive contact area.

[0071] Secondly, when the push rod 12 radially and outwardly presses the side secondary protruding ring 303, the side secondary protruding ring 303 can deform the sealing ring main ring 301 by pulling it to both sides, making the sealing ring main ring 301 bulge more radially inward, that is, the force against the push rod 12 is relatively greater, the sealing degree is relatively higher, and it has an "actively reinforced" sealing effect.

[0072] Third, the three pressure rings 304 respectively correspond to and press one central main protruding ring 302 and two side secondary protruding rings 303, so that the central main protruding ring 302 and the side secondary protruding rings 303 have the initial effect of strengthening and pressing the push rod 12.

[0073] Finally, it should be noted that the clamping effect between the sealing ring unit 3 and the push rod 12, after the above-mentioned multiple strengthening methods, only significantly improves the clamping strength, without the problem of excessive clamping or affecting the reciprocating sliding of the push rod 12.

[0074] The sealing ring unit 3 also includes a groove 305 located on the side of the sealing ring main ring 301, which is provided on the side of the sealing ring main ring 301 and is used to radially pull the deformation of the central main protruding ring 302 by reducing the difficulty of the secondary protruding ring 303 to deform to both sides when the push rod 12 reciprocates.

[0075] In this embodiment, the cross-sectional profile of the sealing ring body ring 301 is rectangular, and the number of deformed grooves 305 is two, with a triangular shape. The main function of the deformed grooves 305 is:

[0076] After it is opened, the difficulty and resistance of the side secondary protrusion ring 303 deforming to both sides are appropriately reduced, and the beneficial effect of the side secondary protrusion ring 303 being pulled and further protruding the central main protrusion ring 302 is significantly improved.

[0077] It should be noted that the airtightness provided by the secondary protruding ring 303 on the side may be reduced at this time, but the airtightness provided by the main protruding ring 302 in the middle will definitely be improved, and the overall airtightness can be significantly increased.

[0078] Before use, the sealing ring unit 3 is supported radially outward by the opening guide ring unit 4 by engaging the main and secondary protruding ring spacing groove 306 with the protruding ring 401, and the sealing ring unit 3 and the two opening guide ring units 4 are assembled.

[0079] In this embodiment, the primary and secondary protruding ring spacing groove 306 naturally formed between the central primary protruding ring 302 and the side secondary protruding ring 303 has the following main functions:

[0080] During storage and transportation of the middle body component, the open guide ring unit 4 first achieves an appropriate shrinkage and deformation effect through the mounting inner narrowing 404, so that the open guide ring unit 4 can be nested into the sealing ring unit 3 and the protruding ring 401 can engage with the primary and secondary protruding ring spacing groove 306.

[0081] Thus, since there are exactly two primary and secondary protruding ring spacer grooves 306, which respectively engage two of the open guide ring units 4, the two open guide ring units 4 and one sealing ring unit 3 can be assembled, making it convenient for producers to optimize the production process.

[0082] As for the sealing ring unit 3, the slight opening force exerted by the open guide ring unit 4 is insufficient to cause it to deform further, and the material of the open guide ring unit 4 itself is less prone to deformation. Therefore, the above-mentioned nested engagement method is convenient for both manufacturers and users, and does not affect the normal use of the sealing ring unit 3 and the open guide ring unit 4.

[0083] Before use, the sealing ring unit 3 is supported radially outward by the side ring 402 engaging the deformed groove 305, and the sealing ring unit 3 and two opening guide ring units 4 are assembled.

[0084] In this embodiment, the deformed groove 305 has the advantage of "two uses in one". Its first function is as described above, that is, it is used in conjunction with the side secondary protrusion ring 303.

[0085] The second function of the deformed groove 305 is to work with the side ring 402 so that the nesting effect of the sealing ring unit 3 and the opening guide ring unit 4 can be achieved in a second way.

[0086] Specifically, in the open guide ring unit 4, the outer diameter of the protruding ring 401 is smaller than the outer diameter of the side ring 402. Therefore, it is sufficient and reasonable for the protruding ring 401 to engage with the primary and secondary protruding ring spacing groove 306, and for the side ring 402 to engage with the relatively larger deformed rear groove 305.

[0087] The engagement effect between the deformed groove 305 and the side ring 402 before the component is used does not affect the normal use of the sealing ring unit 3 and the opening guide ring unit 4.

[0088] The central main protruding ring 302 has an isosceles triangle cross-section, and the side secondary protruding ring 303 has a right triangle cross-section, with the right angle set on the side close to the deformed groove 305.

[0089] In this embodiment, the symmetrical shape of the central main protruding ring 302 makes the pulling deformation effect of the two side secondary protruding rings 303 more symmetrical and uniform, avoiding unnecessary and obvious lateral deformation of the central main protruding ring 302, and instead directly and radially inwardly squeezing the push rod 12 to achieve the desired effect, which is very efficient and necessary.

[0090] The right-angled triangle shape of the secondary protruding ring 303 on the side causes its "thicker" side to be closer to the edge and farther away from the central main protruding ring 302. This makes it more likely to cause greater pulling deformation of the central main protruding ring 302 and trigger the pulling phenomenon more easily, thereby further enhancing the beneficial strength of the increased airtightness at the central main protruding ring 302.

[0091] A brake chamber includes the middle body assembly, and the structure further includes a brake chamber diaphragm connecting plate 5 and a parking chamber diaphragm abutting plate 6 respectively disposed at both ends of the pushrod 12, and a positioning groove 7 disposed on the middle body 11, communicating with one of the guide ring mounting grooves 2, and used to engage the brake chamber diaphragm connecting plate 5.

[0092] In this embodiment, the brake chamber diaphragm connecting disc 5 is bonded to the brake chamber diaphragm, thereby causing the push rod 12 to reciprocate along with the brake chamber diaphragm, ultimately improving the smoothness of the push rod's reciprocating movement.

[0093] The brake chamber diaphragm connecting disc 5 and the parking chamber diaphragm abutment disc 6 are both commercially available parts. An auxiliary spring 9 can be further installed between the parking chamber diaphragm abutment disc 6 and the central body 11, allowing the auxiliary spring 9 to work together with the return spring to ensure the rearward reset effect of the brake chamber diaphragm. Of course, the elastic strength of the auxiliary spring 9 and the return spring is much smaller than that of the parking spring.

[0094] In addition, the positioning groove 7 is used to engage the fully reset and retracted brake chamber diaphragm connecting disc 5, and its ultimate function is also to make the reciprocating movement of the push rod smoother.

[0095] The structure of the brake chamber also includes a thickened ring 8 disposed on the side ring 402 of one of the opening guide ring units 4 and used to buffer the brake chamber diaphragm connecting disk 5 during reciprocating sliding.

[0096] In this embodiment, the thickened ring 8 and the open guide ring unit 4 are integrally formed and made of the same material. The term "thickened" refers to the increased thickness of the overall structure of the thickened ring 8 and the open guide ring unit 4 at this location compared to the method of only setting the side ring 402. Specifically, for example, the thickness of the side ring 402 is 12-14 mm, and the thickness of the thickened ring 8 is 5-6 mm.

[0097] During the service life of the open guide ring unit 4, the thickened ring 8 can completely replace the middle body 11 at the positioning groove 7, and thus serve as the endpoint for the rearward reset of the brake cavity diaphragm connecting plate 5, blocking and buffering the brake cavity diaphragm connecting plate 5, and avoiding deformation and damage to the middle body 11 and / or the brake cavity diaphragm connecting plate 5, which have relatively high replacement costs.

[0098] Generally speaking, the service life of the thickened ring 8 is longer than the effective period of the function of the open guide ring unit 4 in engaging and limiting the push rod 12. Therefore, the blocking and buffering effect of the thickened ring 8 is significantly practical, and the entire structure of the open guide ring unit 4 and the thickened ring 8 only needs to be replaced, not repaired.

[0099] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A middle body assembly, comprising a middle body (11) having a middle body hole (11-1) and a push rod (12), characterized in that: It also includes a sealing ring mounting groove (1) disposed on the central body hole (11-1), two guide ring mounting grooves (2) disposed on the central body hole (11-1) and located on both sides of the sealing ring mounting groove (1), a sealing ring unit (3) disposed on the sealing ring mounting groove (1), and an open guide ring unit (4) disposed on the guide ring mounting groove (2) and used to engage the push rod (12). The guide ring mounting groove (2) includes a bidirectional engaging groove (201) provided on the middle body hole (11-1) and a side groove (202) provided on the middle body hole (11-1) and the side of the middle body (11). The open guide ring unit (4) includes a protruding ring (401) disposed on the bidirectional engaging groove (201), a side ring (402) disposed on the side groove (202), a main body ring (403) disposed on the protruding ring (401) and the side ring (402) and used for engaging the push rod (12), and an inwardly recessed opening (404) for mounting disposed on the protruding ring (401), the side ring (402) and the main body ring (403). The sealing ring unit (3) includes a sealing ring main ring (301) disposed in the sealing ring mounting groove (1), a central main protrusion ring (302) and two side secondary protrusion rings (303) disposed on the inner ring surface of the sealing ring main ring (301) and used to clamp the push rod (12), and three pressure rings (304) disposed on the outer surface of the sealing ring main ring (301) and used to respectively press the central main protrusion ring (302) and the two side secondary protrusion rings (303).

2. The middle body component according to claim 1, characterized in that: The sealing ring unit (3) also includes a groove (305) provided on the side of the sealing ring main ring (301) and, when the push rod (12) slides back and forth, reduces the difficulty of the side secondary protrusion ring (303) to deform to both sides, so as to radially pull the deformation of the central main protrusion ring (302) inward.

3. A middle body component according to claim 1, characterized in that: Before use, the sealing ring unit (3) is used to support the sealing ring unit (3) radially outward by engaging the primary and secondary protruding ring interval groove (306) with the protruding ring (401), and to assemble the sealing ring unit (3) and the two opening guide ring units (4).

4. A middle body component according to claim 2, characterized in that: Before use, the sealing ring unit (3) is used to support the sealing ring unit (3) radially outward by engaging the deformed groove (305) with the side ring (402), and to assemble the sealing ring unit (3) and two opening guide ring units (4).

5. A middle body component according to claim 2, characterized in that: The cross-sectional shape of the central main protrusion ring (302) is an isosceles triangle, and the cross-sectional shape of the side secondary protrusion ring (303) is a right triangle, with the right angle set on the side close to the deformed groove (305).

6. A brake chamber comprising the middle body assembly as described in any one of claims 1-5, characterized in that: The structure also includes a brake chamber diaphragm connecting plate (5) and a parking chamber diaphragm abutment plate (6) respectively located at both ends of the push rod (12), and a positioning groove (7) located on the middle body (11) and connected to one of the guide ring mounting grooves (2) for engaging the brake chamber diaphragm connecting plate (5).

7. A brake chamber according to claim 6, characterized in that: It also includes a thickened ring (8) disposed on the side ring (402) of one of the opening guide ring units (4) and used to buffer the brake chamber diaphragm connecting disc (5) during reciprocating sliding.

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