Piston type brake chamber with short release structure

Abstract

The utility model relates to the field of brake chambers, in particular to a piston type brake chamber with a short release structure, which comprises a service brake chamber, a parking brake chamber and a release component, the parking brake chamber is provided with a piston, a guide sleeve and a spring, the piston is arranged in the parking brake chamber in a sliding manner, the guide sleeve is connected to the left side of the piston, and the spring is connected to the right side of the guide sleeve. The spring is located on the right side of the piston, a channel is formed in the guide sleeve, the release assembly comprises a release bolt, a release nut, a release cap head, a limiting rod, a release spring and a release head, the head of the release bolt is located on the outer side of the parking brake air chamber, the rod portion of the release bolt extends into the channel, and the release nut is connected to the release bolt through left-hand threads and located in the channel; the limiting rod is arranged in a sliding hole of the release bolt, the release cap head is fixedly connected with the left end of the limiting rod and located on the left side of the release bolt, the release head is fixed to the right end of the limiting rod and slidably arranged on the right side of the sliding hole in a telescopic mode, and the release spring sleeves the limiting rod and located on the left side of the release head.

Description

Technical Field

[0001] This utility model relates to the field of brake chambers, and specifically to a piston-type brake chamber with a short release structure. Background Technology

[0002] In vehicle braking systems, the piston-type brake chamber is a core component, and its performance and structural design play a crucial role in the vehicle's braking effect. Currently, conventional piston-type brake chambers mainly consist of a service brake chamber and a parking brake chamber. In the initial installation state, the release rod inside the guide sleeve connected to the piston in the parking brake chamber pushes the piston and guide sleeve to the right, thereby compressing the spring and causing the piston to move away from the inner wall of the chamber. This structure results in approximately 8 cm of the release rod protruding outside the brake chamber.

[0003] With the booming development of urban public transportation and the increasingly prominent issue of population aging, the design requirements for urban bus chassis are constantly increasing. To improve passenger convenience, especially to meet the needs of elderly passengers and other special groups, low-chassis buses are gradually becoming a development trend, and the application of low-bed axles in buses is becoming more and more widespread. The use of low-bed axles places new and more stringent requirements on the release structure and installation distance of piston disc brake chambers. The long exposed length of the release rod in traditional piston brake chambers can no longer meet the installation and usage requirements of low-bed axles, necessitating the design of a piston brake chamber with a short release structure. Utility Model Content

[0004] To address the problems of the prior art, this utility model provides a piston-type brake chamber with a short release structure.

[0005] The objective of this utility model can be achieved through the following technical solution: A piston-type brake chamber with a short release structure includes a service brake chamber, a parking brake chamber, and a release assembly. The parking brake chamber is provided with a piston, a guide sleeve, and a spring. The piston is slidably disposed inside the parking brake chamber. The guide sleeve is connected to the left side of the piston. The spring is located inside the parking brake chamber and on the right side of the piston. The guide sleeve has a channel inside. The release assembly includes a release bolt, a release nut, a release cap, a limit rod, a release spring, and a release head. The head of the bolt is located outside the parking brake chamber. The rod of the release bolt is rotatably disposed within the parking brake chamber and extends into the channel. The release nut is connected to the release bolt via a reverse thread and is located within the wide portion of the channel. The limiting rod is slidably disposed within the sliding hole of the release bolt. The release cap is fixedly connected to the left end of the limiting rod and is located on the left side of the release bolt. The release head is fixed to the right end of the limiting rod and is slidably extended and retracted on the right side of the sliding hole. The release spring is sleeved on the limiting rod and is located on the left side of the release head and within the sliding hole.

[0006] As a further improvement, the left end of the release bolt is provided with a slip groove.

[0007] In a further improvement, the release cap includes a limiting cap and a pushing ring. The left end of the limiting rod has a conical head, and the right side of the conical head is provided with an annular groove. The pushing ring is located on the right side of the annular groove. The limiting cap has a circular cavity, and the outer side of the circular cavity is provided with a deformation groove. The circular cavity is engaged with the left side of the annular groove through deformation. The outer diameter of the pushing ring is larger than the outer diameter of the release nut.

[0008] In a further improvement, a spring seat is provided on the right side inside the parking brake chamber. The spring seat is located to the right of the spring. A release nut seat is provided inside the spring seat. The right side of the release bolt passes through the release nut seat. A washer is fitted on the release bolt. The washer is located to the right of the release nut seat and outside the parking brake chamber. A retaining ring is provided on the release bolt. The retaining ring is located to the left of the release nut seat and inside the parking brake chamber.

[0009] In a further improvement, a second gasket is provided on the right side of the wide portion of the channel. The second gasket is fitted onto the release bolt and is located on the right side of the release nut.

[0010] In a further improvement, the release bolt has a groove, and a sealing ring is provided in the groove, with the sealing ring located inside the release nut seat.

[0011] Compared with the prior art, the present invention has the following advantages in terms of its piston-type brake chamber with a short release structure:

[0012] 1. The release structure adopts a release bolt and a release nut with reverse thread connection. It is not an integrated design. Most of the release bolt is located inside the guide sleeve, and a small part is exposed. In the initial installation state, the exposed length of the release bolt is only 2cm, which is about 8cm compared with the traditional release rod. This effectively shortens the exposed length and meets the special requirements of low-bed axle for piston disc brake chamber release structure and installation distance.

[0013] 2. The rotation of the release bolt in the release assembly drives the release nut with the reverse thread connection to move. When adjusting the parking brake, the release nut pushes the release cap and the limit rod to move to the left, causing the colored release head to retract into the release bolt. This changes the traditional method of adjusting the position by feel, and clearly and intuitively displays the installation position information through the retraction of the release head, improving the accuracy and reliability of the adjustment. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the present invention.

[0015] Figure 2This is a schematic diagram of the internal structure of the present invention.

[0016] Figure 3 for Figure 2 Schematic diagram of the enlarged part

[0017] Figure 4 A structural diagram of the existing technical solution.

[0018] Figure 5 This is a schematic diagram of the structure of the limiting cap in this utility model.

[0019] In the diagram, 1-service brake chamber, 2-parking brake chamber, 21-piston, 22-guide sleeve, 221-channel, 222-shield two, 23-spring, 24-spring seat, 3-release assembly, 31-release bolt, 311-shield one, 312-retaining ring, 313-slip groove, 314-groove, 315-sealing ring, 316-sliding hole, 32-release nut, 33-release cap, 331-limit cap, 332-push ring, 333-circular retaining cavity, 334-deformation groove, 34-limiting rod, 341-conical head, 342-annular retaining groove, 35-release spring, 36-release head, 37-release nut seat. Detailed Implementation

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to fixed connections or detachable connections, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] The following is a description of the embodiments and appendices. Figures 1-5 The technical solution of this utility model will be further described below.

[0022] Example 1

[0023] A piston-type brake chamber with a short release structure includes a service brake chamber 1, a parking brake chamber 2, and a release assembly 3. The parking brake chamber 2 is provided with a piston 21, a guide sleeve 22, and a spring 23. The piston 21 is slidably disposed inside the parking brake chamber 2. The guide sleeve 22 is connected to the left side of the piston. The spring 23 is located inside the parking brake chamber 2 and to the right of the piston 21. The guide sleeve 22 has a channel 221 inside. The release assembly 3 includes a release bolt 31, a release nut 32, a release cap 33, a limiting rod 34, a release spring 35, and a release head 36. The head of the release bolt 31 is located within the parking brake chamber. Outside chamber 2, the rod of the release bolt 31 is rotatably mounted inside the parking brake air chamber 2 and extends into the channel 221. The release nut 32 is connected to the release bolt 31 by reverse thread and is located in the wide part of the channel 221. The limiting rod 34 is slidably mounted in the sliding hole 316 of the release bolt 31. The release cap 33 is fixedly connected to the left end of the limiting rod 34 and is located on the left side of the release bolt 31. The release head 36 is fixed to the right end of the limiting rod 34 and is slidably extended and retracted on the right side of the sliding hole 316. The release spring 35 is sleeved on the limiting rod 34 and is located on the left side of the release head 36 and inside the sliding hole 316.

[0024] The piston-type brake chamber with a short release structure in this embodiment operates on a core principle based on a unique release component design and a reverse-threaded connection mechanism. When the parking brake needs adjustment, rotating the release bolt causes the release nut to move to the left on the release bolt due to the reverse-threaded connection between the release nut and the release bolt, according to the principle of thread transmission. As the release nut moves to the left, its thrust on the guide sleeve gradually decreases until it no longer pushes the guide sleeve. At this point, the spring in the parking brake chamber, through its own elastic restoring force, pushes the guide sleeve and piston to the left. Continuous rotation of the release bolt eventually brings the piston into close contact with the inner wall of the chamber, and the guide sleeve moves to the predetermined position, thus completing the parking brake adjustment operation.

[0025] During this adjustment process, as the release nut moves to the left, it pushes the release cap and the limit rod to the left as well. The red-colored release head, which was originally protruding from the release bolt, gradually retracts into the release bolt under the action of the limit rod. Compared to traditional solutions that rely solely on experience and intuition for position adjustment, this solution uses the retraction of the release head to visually and clearly demonstrate the adjustment process, allowing operators to accurately determine whether the adjustment is in place, greatly improving the accuracy and reliability of the adjustment.

[0026] From a structural design perspective, in the initial installation state, a traditional piston-type brake chamber relies on the integrated left end of the release lever pressing against the right end of the guide sleeve. This pushes the piston and guide sleeve to the right and compresses the spring to its shortest position, moving the piston away from the inner wall of the brake chamber. During subsequent adjustments, the release lever needs to move to the left, entering the guide sleeve from outside the brake chamber. As the spring releases pressure, the piston and guide sleeve gradually move to the left until they are in contact with the inner wall of the brake chamber. Due to the inherent stroke requirements and this integrated structural design, the length of the release lever protruding from the outside of the brake chamber in the initial installation state is approximately 8 cm.

[0027] This application proposes an innovative design for the release structure. The release bolt is mostly located inside the guide sleeve, with only a small portion exposed to the outside of the brake chamber, requiring an exposed length of only 2cm. In the initial installation state, the release nut connected to the reverse thread on the release bolt presses against the right end of the guide sleeve. This non-integrated design allows for adjustment by simply rotating the release bolt, which moves the release nut to the left, releasing the spring pressure and pushing the piston and guide sleeve to the left until the adjustment is complete. Simultaneously, the release bolt itself does not require significant movement to meet the adjustment requirements. This design effectively shortens the exposed length of the release structure, perfectly meeting the specific requirements of low-bed axles for the piston disc brake chamber release structure and installation distance, providing a practical solution for optimizing the braking system of low-chassis vehicles.

[0028] As a further preferred embodiment, the left end of the release bolt 31 is provided with a slip groove 313.

[0029] The slip groove design is based on the slip mechanism in mechanical transmission. When the release nut moves to the left on the release bolt to the slip groove position, the special shape of the slip groove disrupts the originally stable threaded transmission friction between the release nut and the release bolt. At this point, even if the release bolt is continued to be rotated, the release nut cannot move further to the left on the release bolt. This design effectively prevents the release nut from applying excessive thrust to the release cap due to over-rotation of the release bolt, thus preventing the release cap from being accidentally pushed off the limit rod. This design ensures that the release head can always work normally and continuously perform its function of displaying installation information. No matter how the operator rotates the release bolt during adjustment, the key structure of the release component will not be damaged due to over-adjustment, ensuring the stability and reliability of the entire brake chamber release structure. This allows operators to perform adjustment operations with greater confidence, without worrying about the release structure failing due to operational errors.

[0030] As a further preferred embodiment, the release cap 33 includes a limiting cap 331 and a pushing ring 332. The left end of the limiting rod 34 has a conical head 341. The right side of the conical head 341 is provided with an annular groove 342. The pushing ring 332 is disposed on the right side of the annular groove 342. The limiting cap 331 is provided with a circular cavity 333. The outer side of the circular cavity 333 is provided with a deformation groove 334. The circular cavity is engaged with the left side of the annular groove 342 by deformation. The outer diameter of the pushing ring 332 is larger than the outer diameter of the release nut 32.

[0031] The release cap consists of a limit cap and a push ring, and its unique structural design is based on the principles of mechanical connection and force transmission. The conical head and annular groove on the left end of the limit rod cooperate with the circular cavity and deformation groove of the limit cap. The circular cavity elastically deforms and engages with the left side of the annular groove, forming a stable connection. The push ring is located on the right side of the annular groove, and its outer diameter is larger than that of the release nut. During adjustment, when the release nut moves to the left and pushes the release cap, the push ring effectively absorbs the thrust of the release nut and transmits the force to the limit rod and the release head.

[0032] As a further preferred embodiment, a spring seat 24 is provided on the right side inside the parking brake chamber 2. The spring seat 24 is located to the right of the spring 23. A release nut seat 37 is provided inside the spring seat 24. The release bolt 31 is provided through the release nut seat 37 on the right side. A washer 311 is fitted on the release bolt 31. The washer 311 is located to the right of the release nut seat 37 and outside the parking brake chamber 2. A retaining ring 312 is provided on the release bolt 31. The retaining ring 312 is located to the left of the release nut seat 37 and inside the parking brake chamber 2.

[0033] To position and secure the release bolt, and to properly distribute and transmit the pressure of the spring and the thrust of the release nut, a washer is used. This increases the contact area between the release bolt and external components, dispersing pressure and preventing localized damage to external components. A retaining ring restricts the axial movement of the release bolt within the parking brake chamber, ensuring the release bolt maintains a stable position during rotational adjustments.

[0034] As a further preferred embodiment, a second gasket 222 is provided on the right side of the wide portion of the channel 221. The second gasket 222 is sleeved on the release bolt 31 and located on the right side of the release nut 32.

[0035] During the adjustment process of moving the release nut to the left, the second shim can buffer the impact force of the release nut on the right side wall of the channel, while limiting the axial movement range of the release nut in the channel, preventing the release nut from moving excessively and disengaging from the predetermined position.

[0036] As a further preferred embodiment, the release bolt 31 is provided with a groove 314, and a sealing ring 315 is provided in the groove 314, the sealing ring 315 being located inside the release nut seat 37.

[0037] The sealing ring has good elasticity and sealing performance. When the release bolt is installed in the release nut seat, the sealing ring can fit tightly against the inner wall of the release bolt and the release nut seat, preventing gas or liquid from leaking from the gap between them.

[0038] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A piston-type brake chamber with a short-release structure, characterized in that, The system includes a service brake chamber, a parking brake chamber, and a release assembly. The parking brake chamber has a piston, a guide sleeve, and a spring. The piston is slidably disposed inside the parking brake chamber. The guide sleeve is connected to the left side of the piston. The spring is located inside the parking brake chamber and to the right of the piston. The guide sleeve has a channel inside. The release assembly includes a release bolt, a release nut, a release cap, a limiting rod, a release spring, and a release head. The head of the release bolt is located outside the parking brake chamber. The rod of the release bolt is rotatably disposed inside the parking brake chamber and extends into the channel. The release nut is connected to the release bolt by a reverse thread and is located within the wide portion of the channel. The limiting rod is slidably disposed within the sliding hole of the release bolt. The release cap is fixedly connected to the left end of the limiting rod and is located to the left of the release bolt. The release head is fixed to the right end of the limiting rod and is slidably extended and retracted to the right side of the sliding hole. The release spring is sleeved on the limiting rod and is located to the left of the release head and within the sliding hole.

2. A piston-type brake chamber with a short-release structure according to claim 1, characterized in that, The left end of the release bolt is provided with a slip groove.

3. A piston-type brake chamber with a short-release structure according to claim 1, characterized in that, The release cap includes a limiting cap and a pushing ring. The left end of the limiting rod has a conical head, and the right side of the conical head is provided with an annular groove. The pushing ring is located on the right side of the annular groove. The limiting cap has a circular cavity, and the outer side of the circular cavity is provided with a deformation groove. The circular cavity is engaged with the left side of the annular groove through deformation. The outer diameter of the pushing ring is larger than the outer diameter of the release nut.

4. A piston-type brake chamber with a short-release structure according to claim 1, characterized in that, A spring seat is provided on the right side inside the parking brake chamber. The spring seat is located to the right of the spring. A release nut seat is provided inside the spring seat. The release bolt passes through the release nut seat on the right side. A washer is fitted on the release bolt. The washer is located to the right of the release nut seat and outside the parking brake chamber. A retaining ring is provided on the release bolt. The retaining ring is located to the left of the release nut seat and inside the parking brake chamber.

5. A piston-type brake chamber with a short-release structure according to claim 1, characterized in that, A second gasket is provided on the right side of the wide portion of the channel. The second gasket is fitted onto the release bolt and is located on the right side of the release nut.

6. A piston-type brake chamber with a short-release structure according to claim 4, characterized in that, The release bolt has a groove, and a sealing ring is provided in the groove. The sealing ring is located inside the release nut seat.

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