Parking brake chamber

Abstract

The utility model relates to the technical field of automobile parts, and provides a parking brake air chamber which comprises a piston, a first piston rod, a second piston rod, a first piston rod and a second piston rod. The spring is arranged in the shell and located between the second end face of the piston and the shell. A bolt head of the first release bolt is located in the parking cavity, the tail end of the first release bolt penetrates through the through hole of the piston and is in threaded connection with the first threaded hole of the shell, and the diameter of the bolt head of the first release bolt is larger than that of the through hole of the piston; a second threaded hole is formed in the tail end of the first release bolt, the tail end of the second release bolt is in threaded connection with the second threaded hole, and the threaded direction of the second threaded hole is opposite to that of the first threaded hole. According to the utility model, the first release bolt can be effectively driven to rotate by screwing the second release bolt, and then the first release bolt drives the piston to compress the spring, so that the parking brake air chamber enters a parking brake releasing state.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a parking brake air chamber. Background Art

[0002] When the vehicle is in normal driving state, the parking chamber of the parking brake chamber is filled with compressed air and the spring inside the parking brake chamber is compressed; when the hand valve is pulled to perform parking brake, the compressed air in the parking chamber is discharged, the spring inside the parking brake chamber is reset, and the actuator of the parking brake chamber is pushed to move to achieve parking brake.

[0003] Figure 1 The cross-sectional structure of the existing parking brake chamber is shown. Figure 1 As shown, when the parking brake fails, there is no compressed air in the parking chamber 11, causing the spring 30 to be in an uncompressed state. Therefore, the parking brake chamber is in the parking brake state. In this case, in order to allow the vehicle to drive normally, it is necessary to manually loosen the release bolt 40 with a tool until the bolt head 44 drives the piston 20 to compress the spring 30, thereby releasing the parking brake.

[0004] The current release bolt 40 has a nut 48 attached to its end. When manually loosening the release bolt 40 with a tool, the tool acts on the nut 48. A radial hole is drilled between the nut 48 and the release bolt 40, through which a fastening pin 50 is inserted to secure the nut 48. This design presents several problems: During production, drilling equipment is required on the production line, and installing the fastening pin 50 is time-consuming. Furthermore, during use, the fastening pin 50 protrudes from the nut 48, preventing the tool from properly tightening the nut 48.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Utility Model Content

[0006] This utility model provides a parking brake chamber. A second release bolt is threadedly connected to the rear end of a first release bolt, with the second release bolt having a threaded direction opposite to that of the first release bolt. Tightening the second release bolt causes the first release bolt to rotate, which in turn drives a piston to compress a spring, releasing the parking brake chamber. This utility model is easy to manufacture, requiring only the threaded hole for the second release bolt to be threaded during machining of the first release bolt. Assembly of the second release bolt is quick and simple. When releasing the parking brake, a tool can securely grip the bolt head of the second release bolt, eliminating the risk of interference from unusual protrusions that could prevent proper tool use.

[0007] According to one aspect of the utility model, a parking brake air chamber is provided, comprising a piston and a spring arranged in a shell, a parking cavity being limited between a first end face of the piston and the shell, and the spring being arranged between a second end face of the piston and the shell; the parking brake air chamber also comprises: a first release bolt, a bolt head of the first release bolt being located in the parking cavity, a tail end of the first release bolt passing through the through hole of the piston and being screwed to the first threaded hole of the shell, a diameter of the bolt head of the first release bolt being larger than a diameter of the through hole of the piston; a second release bolt, a second threaded hole being provided at the tail end of the first release bolt, a tail end of the second release bolt being screwed to the second threaded hole, a thread direction of the second threaded hole being opposite to that of the first threaded hole.

[0008] In some embodiments, as the second release bolt rotates in its tightening direction, the first release bolt rotates in its loosening direction, so that the bolt head of the first release bolt rotates to abut the piston and compress the spring, and the parking brake air chamber enters a parking brake release state.

[0009] In some embodiments, the first release bolt is an M16 bolt, and the second threaded hole is an M8 threaded hole.

[0010] In some embodiments, the diameter of the bolt head of the second release bolt is 24 mm.

[0011] In some embodiments, the bolt head of the second release bolt is a polygonal bolt head.

[0012] In some embodiments, the length of the second threaded hole is 25 mm to 30 mm.

[0013] In some embodiments, a tail end of the first release bolt extends out of the housing.

[0014] In some embodiments, the parking brake air chamber further includes: a connecting pipe, disposed in the parking cavity and connected to the first end face of the piston, wherein the bolt head of the first release bolt extends into the connecting pipe and is gap-fitted with the inner wall of the connecting pipe.

[0015] In some embodiments, the bolt head of the first release bolt has an arc edge profile.

[0016] In some embodiments, the connecting tube is threadedly connected to the first end face of the piston, and a gasket is provided on the end face of the threaded portion; as the first release bolt rotates in its loosening direction, the bolt head of the first release bolt rotates and abuts against the gasket.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least:

[0018] The utility model utilizes a second release bolt threadedly connected to the rear end of the first release bolt, with the second release bolt having a thread direction opposite to that of the first release bolt. Tightening the second release bolt causes the first release bolt to rotate, which in turn causes the first release bolt to drive a piston to compress a spring, thereby releasing the parking brake chamber. The diameter of the bolt head of the first release bolt is larger than the diameter of the through hole of the piston, so that as the first release bolt rotates, its bolt head abuts the piston, thereby driving the piston to compress the spring.

[0019] The utility model is easy to manufacture, requiring only the machining of a second threaded hole for the second release bolt at the rear end of the first release bolt during the machining process. Furthermore, assembly of the second release bolt is quick and easy. When releasing the parking brake, the tool can stably clamp the bolt head of the second release bolt, eliminating the risk of interference from unusual protrusions that could prevent proper tool use.

[0020] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0022] Figure 1 A schematic cross-sectional view of an existing parking brake air chamber is shown;

[0023] Figure 2 A schematic cross-sectional view of the parking brake air chamber in an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0025] The accompanying drawings are only schematic diagrams of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar structures, and their repeated description will be omitted.

[0026] In the description of the present invention, "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. The orientation or position relationship indicated by the terms "left", "right" and the like is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of description and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The term "plurality" means two or more, unless otherwise clearly and specifically defined. In addition, in the description of the present invention, when it is said that a device is "connected" to another device, this includes not only direct connections, but also indirect connections through other elements.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in different embodiments may be combined with each other.

[0028] The parking brake air chamber provided by the utility model has a structure of a housing, a piston and a spring. Figure 1 Same as in. Figure 2 The cross-sectional structure of the parking brake air chamber in the embodiment of the present utility model is shown. Figure 2 , and combined Figure 1 As shown, the parking brake air chamber provided by the embodiment of the present utility model includes:

[0029] The piston 20 is disposed in the housing 10, and a parking chamber 11 is defined between a first end surface of the piston 20 and the housing 10;

[0030] The spring 30 is disposed in the housing 10 and is located between the second end surface of the piston 20 and the housing 10;

[0031] A first release bolt 60, wherein a bolt head 62 of the first release bolt 60 is located in the parking chamber 11, and a tail end 63 of the first release bolt 60 passes through the through hole 22 of the piston 20 and is threadedly engaged with the first threaded hole 12 of the housing 10. The diameter of the bolt head 62 of the first release bolt 60 is larger than the diameter of the through hole 22 of the piston 20;

[0032] The second release bolt 70 , the tail end 63 of the first release bolt 60 is provided with a second threaded hole 66 , the tail end 72 of the second release bolt 70 is screwed into the second threaded hole 66 , and the thread direction of the second threaded hole 66 is opposite to that of the first threaded hole 12 .

[0033] In this utility model, a second release bolt 70 is threadedly connected to the tail end 63 of the first release bolt 60. The thread direction of the second release bolt 70 is opposite to that of the first release bolt 60. Tightening the second release bolt 70 causes the first release bolt 60 to rotate, thereby causing the first release bolt 60 to drive the piston 20 to compress the spring 30, thereby releasing the parking brake chamber. The diameter of the bolt head 62 of the first release bolt 60 is larger than the diameter of the through hole 22 of the piston 20. This allows the bolt head 62 of the first release bolt 60 to abut the piston 20 as it rotates, thereby driving the piston 20 to compress the spring 30.

[0034] The present invention is easy to manufacture. Only the second threaded hole 66 for threadably receiving the second release bolt 70 needs to be machined at the rear end of the first release bolt 60 during the manufacturing process. This reduces the number of parts and allows for quick and simple assembly of the second release bolt 70. When releasing the parking brake, the tool can stably grip the bolt head 62 of the second release bolt 70, eliminating any interference from unusual protrusions that could prevent proper tool operation.

[0035] In some embodiments, as the second release bolt 70 rotates in its tightening direction, the first release bolt 60 rotates in its loosening direction, so that the bolt head 62 of the first release bolt 60 rotates to abut the piston 20 and compress the spring 30, and the parking brake air chamber enters the parking brake release state.

[0036] Because the second threaded hole 66 has a thread direction opposite to that of the first threaded hole 12, when the second release bolt 70 is rotated in its tightening direction using a tool, the second release bolt 70 remains securely connected to the first release bolt 60, while the first release bolt 60 is rotated in its loosening direction. As the rotation continues, the first release bolt 60 gradually withdraws from the interior of the housing 10 until the bolt head 62 of the first release bolt 60 rotates and abuts the piston 20, thereby causing the piston 20 to compress the spring 30, releasing the parking brake chamber.

[0037] The tightening direction of the second release bolt 70 is, for example, counterclockwise (ie, left-handed), but is not limited thereto.

[0038] In a scenario where the second release bolt 70 needs to be replaced, the second release bolt 70 can be driven to rotate in its loosening direction, and the fastening connection state between the first release bolt 60 and the housing 10 is not affected.

[0039] In a preferred embodiment, the tail end 63 of the first release bolt 60 extends out of the housing 10. This facilitates the threaded connection of the second release bolt 70 with the second threaded hole 66, preventing interference with the housing 10 and other components. Furthermore, during assembly of the second release bolt 70, the tail end 63 of the first release bolt 60 can be clamped with a fixture to prevent any loss of the secure connection between the first release bolt 60 and the housing 10. After assembly, the second release bolt 70 can be rotated in the tightening direction to mechanically release the parking brake, as described in the above embodiment.

[0040] In some embodiments, the first release bolt 60 is an M16 bolt, and the second threaded hole 66 is an M8 threaded hole. That is, the diameter D1 of the first release bolt 60 is 16 mm, and the diameter D2 of the second threaded hole 66 is 8 mm. This ensures a secure fit between the first release bolt 60 and the housing 10, while ensuring that the second threaded hole 66 does not affect the structural strength of the first release bolt 60. Furthermore, a secure fit between the second release bolt 70 and the first release bolt 60 is ensured.

[0041] In some embodiments, the diameter D3 of the bolt head 71 of the second release bolt 70 is 24 mm. That is, the diameter D3 of the bolt head 71 of the second release bolt 70 is slightly larger than the diameter D1 of the first release bolt 60 to ensure that rotating the second release bolt 70 can drive the first release bolt 60 to rotate.

[0042] In some embodiments, the bolt head 71 of the second release bolt 70 is a polygonal bolt head. For example, the bolt head 71 of the second release bolt 70 can be a hexagonal bolt head, but is not limited thereto. The polygonal bolt head design facilitates the use of a tool to drive the second release bolt 70 and the first release bolt 60 to rotate.

[0043] In some embodiments, the length L of the second threaded hole 66 is 25 mm to 30 mm, thereby ensuring a secure connection between the second release bolt 70 and the first release bolt 60 .

[0044] In some embodiments, the parking brake air chamber further includes: a connecting pipe 80, which is disposed in the parking cavity 11 and connected to the first end face of the piston 20, and the bolt head 62 of the first release bolt 60 extends into the connecting pipe 80 and is gap-fitted with the inner wall of the connecting pipe 80.

[0045] The connecting pipe 80 is used to connect the piston 20 to the actuator 90 of the parking brake chamber to realize parking brake and release. The bolt head 62 of the first release bolt 60 extends into the connecting pipe 80, which can fully utilize the internal space of the housing 10 and realize a reasonable layout between components.

[0046] In some embodiments, the bolt head 62 of the first release bolt 60 has an arc-shaped edge profile 62 ′, so as to prevent the first release bolt 60 from scratching and damaging the connecting pipe 80 during rotation.

[0047] In some embodiments, the connecting tube 80 is threadedly connected to the first end surface of the piston 20, and a gasket 28 is provided on the end surface of the threaded connection. As the first release bolt 60 rotates toward its release direction, the bolt head 62 of the first release bolt 60 rotates and abuts the gasket 28. The gasket 28 is used to achieve a tight fit between the connecting tube 80 and the first end surface of the piston 20, and also facilitates the rotation of the bolt head 62 of the first release bolt 60 against the gasket 28 to compress the piston 20 and spring 30 when the parking brake is mechanically released.

[0048] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A parking brake chamber, comprising a piston and a spring disposed in a housing, wherein a parking cavity is defined between a first end surface of the piston and the housing, and the spring is disposed between a second end surface of the piston and the housing; It is characterized in that The parking brake chamber also includes: a first release bolt, wherein a bolt head of the first release bolt is located in the parking cavity, a tail end of the first release bolt passes through the through hole of the piston and is threadedly engaged with the first threaded hole of the housing, and a diameter of the bolt head of the first release bolt is larger than a diameter of the through hole of the piston; The second release bolt is provided with a second threaded hole at the tail end of the first release bolt, the tail end of the second release bolt is screwed to the second threaded hole, and the thread direction of the second threaded hole is opposite to that of the first threaded hole.

2. The parking brake chamber according to claim 1, characterized in that: As the second release bolt rotates in its tightening direction, the first release bolt rotates in its loosening direction, so that the bolt head of the first release bolt rotates to abut against the piston and compress the spring, and the parking brake air chamber enters a parking brake release state.

3. The parking brake chamber according to claim 1, wherein: The first release bolt is an M16 bolt, and the second threaded hole is an M8 threaded hole.

4. The parking brake chamber according to claim 3, characterized in that: The diameter of the bolt head of the second release bolt is 24 mm.

5. The parking brake chamber according to claim 1, wherein: The bolt head of the second release bolt is a polygonal bolt head.

6. The parking brake chamber according to claim 1, wherein: The length of the second threaded hole is 25 mm to 30 mm.

7. The parking brake chamber according to claim 1, wherein: A tail end of the first release bolt extends out of the housing.

8. The parking brake chamber according to claim 1, wherein: Also includes: A connecting pipe is arranged in the parking cavity and connected to the first end surface of the piston. The bolt head of the first release bolt extends into the connecting pipe and is gap-fitted with the inner wall of the connecting pipe.

9. The parking brake chamber according to claim 8, characterized in that: The bolt head of the first release bolt has an edge profile of a circular arc.

10. The parking brake chamber according to claim 8, wherein: The connecting pipe is threadedly connected to the first end surface of the piston, and a gasket is provided on the end surface of the threaded connection portion; As the first release bolt rotates toward its loosening direction, the bolt head of the first release bolt rotates and abuts against the gasket.

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