Single-cylinder brake actuated through hydraulic pressure

Abstract

The utility model provides a hydraulically actuated single-cylinder brake, which comprises a brake shoe assembly, a brake bottom plate assembly, an expander assembly and a single-cavity brake cylinder which are connected in sequence, the expander assembly comprises an expander, an adjusting screw rod of the expander is connected with a web plate of the brake shoe assembly, the single-cavity brake cylinder comprises a single-cavity cylinder body, and the single-cavity cylinder body is connected with the brake bottom plate assembly. A single-cavity piston moving in the axial direction of the single-cavity cylinder body is arranged in the single-cavity cylinder body, a guide ring and a sealing ring are arranged on the circumferential side of the single-cavity piston at intervals, an exhaust hole and an oil inlet are formed in the bottom of the single-cavity cylinder body, and an exhaust nozzle is arranged in the exhaust hole. The defects that in the prior art, an air pressure brake cannot meet the requirement for long-time service braking, and meanwhile the dragging and abrasion risk of the brake exists can be overcome.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, specifically to a single-cylinder brake that is hydraulically actuated. Background Technology

[0002] As one of the most important subsystems of a vehicle chassis, the braking system's high reliability is crucial for the smooth and safe operation of the vehicle. Therefore, researching efficient and reliable brakes has become a hot topic in the industry. This is especially true in the commercial vehicle sector, where the heavy loads and large inertia during operation place even more stringent demands on braking torque and braking response.

[0003] Currently, the most common brakes in the commercial vehicle sector include drum brakes and disc brakes. Disc brakes are difficult to widely promote and apply in the commercial vehicle market due to their high manufacturing cost and complex structure. Drum brakes, on the other hand, use an external power unit and undergo a series of mechanical power conversions to achieve braking by pushing the brake shoes with friction pads outward along a fixed center to both sides to contact the brake drum and form a friction pair. They have the characteristics of simple structure, low manufacturing cost, and large braking torque, and have been widely used in the commercial vehicle market.

[0004] The main operating modes of drum brakes include: pneumatic camshaft type and pneumatic wedge type.

[0005] Among them, the pneumatic camshaft type and the pneumatic wedge type use an external single-chamber air chamber. During service braking, high-pressure gas pushes the piston rod in the service chamber to move linearly, causing the camshaft and wedge to rotate or move linearly. The torque generated by the high-pressure gas is amplified by the involute cam or the wedge with a tapered angle, quickly bringing the brake shoes into close contact with the brake drum, thereby generating a larger braking torque and completing the vehicle's service braking. Although this structure has a large braking torque, because its power source is an external air pressure pipeline, the air compression ratio is high and it is prone to leakage, making it difficult to meet the needs of long-term braking and limiting the braking torque, thus unsuitable for heavy-load conditions.

[0006] Therefore, the existing technology faces the problem that air brakes cannot meet the requirements of long-term vehicle braking, and there is also the risk of brake wear. Therefore, it is necessary to innovate the air chamber structure based on the air drum brake, change the power source from air pressure to hydraulic pressure, and thus combine the advantages of both types of brakes, and invent a hydraulic drum brake actuation mechanism with large braking torque that meets the needs of long-term braking. Utility Model Content

[0007] Therefore, this utility model provides a hydraulically actuated single-cylinder brake that can overcome the shortcomings of existing pneumatic brakes, which cannot meet the requirements of long-term vehicle braking and also pose a risk of brake wear.

[0008] To address the aforementioned problems, this utility model provides a hydraulically actuated single-cylinder brake, comprising a brake shoe assembly, a brake base plate assembly, an expander assembly, and a single-chamber brake cylinder connected in sequence. The expander assembly includes an expander, and the adjusting screw of the expander is connected to the web of the brake shoe assembly. The single-chamber brake cylinder includes a single-chamber cylinder body, and a single-chamber piston that moves axially within the single-chamber cylinder body. Guide rings and sealing rings are spaced apart around the single-chamber piston. An exhaust port and an oil inlet are provided at the bottom of the single-chamber cylinder body, and an exhaust nozzle is provided within the exhaust port.

[0009] In some embodiments, the sealing ring is a Y-shaped sealing ring.

[0010] In some embodiments, the single-chamber cylinder is connected to the expansion assembly end face by bolts.

[0011] In some embodiments, the oil inlet is provided with an oil sealing nozzle and an oil filling plug.

[0012] This utility model provides a hydraulically actuated single-cylinder brake. Compared with conventional pneumatic drum brakes, the hydraulically actuated cylinder used in this application has a relatively smaller size and structure, and the number of parts is significantly reduced, thereby effectively reducing the overall weight of the brake. Compared with pneumatic drum brakes of the same specifications, the braking torque of this application can be increased by more than 41%, and the braking torque density can be increased by 58%. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a hydraulically actuated single-cylinder brake according to an embodiment of the present utility model.

[0014] Figure 2 This is a schematic diagram of the single-chamber brake cylinder structure of a hydraulically actuated single-cylinder brake according to an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the internal structure of a single-chamber brake cylinder of a hydraulically actuated single-cylinder brake according to an embodiment of the present invention.

[0016] The reference numerals in the attached figures are as follows:

[0017] 1. Brake shoe assembly; 2. Brake backing plate assembly; 3. Expander assembly; 5. Single-chamber brake cylinder; 51. Exhaust nozzle; 52. Oil inlet; 53. Single-chamber cylinder body; 54. Guide ring; 55. Filler plug; 56. Oil seal nozzle; 57. Sealing ring; 58. Single-chamber piston. Detailed Implementation

[0018] See also Figures 1 to 3As shown in the embodiment of this utility model, a hydraulically actuated single-cylinder brake is provided, comprising a brake shoe assembly 1, a brake base plate assembly 2, an expander assembly 3, and a single-chamber brake cylinder 5 connected in sequence. The expander assembly 3 includes an expander, and the adjusting screw of the expander is connected to the web of the brake shoe assembly 1. The single-chamber brake cylinder 5 includes a single-chamber cylinder body 53, and a single-chamber piston 58 that moves axially within the single-chamber cylinder body 53. The single-chamber piston 58 is provided with guide rings 54 and sealing rings 57 spaced apart around its periphery. The bottom of the single-chamber cylinder body 53 is provided with an exhaust port and an oil inlet 52, and an exhaust nozzle 51 is provided in the exhaust port. Compared with conventional pneumatic drum brakes, the hydraulically actuated cylinder used in this application has a relatively smaller size and structure, and the number of parts is significantly reduced, thereby effectively reducing the overall weight of the brake. Compared with pneumatic drum brakes of the same specifications, the braking torque of this application can be increased by more than 41%, and the braking torque density can be increased by 58%.

[0019] In one specific embodiment, the sealing ring 57 is a Y-shaped sealing ring.

[0020] In one specific embodiment, the single-chamber cylinder 53 is connected to the expansion assembly connection end face by bolts.

[0021] In one specific embodiment, the oil inlet 52 is provided with an oil sealing nozzle 56 and an oil filling plug 55.

[0022] When braking is required, brake fluid is introduced through the inlet 52, which pushes the single-chamber piston 58 to move and act on the expander 3 to brake; when the brake is released, the brake fluid is discharged, the single-chamber piston 58 is reset under the spring force of the expander, and the brake is released.

[0023] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A hydraulically actuated single-cylinder brake, characterized in that, The assembly includes a brake shoe assembly (1), a brake base plate assembly (2), an expander assembly (3), and a single-chamber brake cylinder (5) connected in sequence. The expander assembly (3) includes an expander, and the adjusting screw of the expander is connected to the web of the brake shoe assembly (1). The single-chamber brake cylinder (5) includes a single-chamber cylinder body (53), and the single-chamber cylinder body (53) has a single-chamber piston (58) that moves along its axial direction. The single-chamber piston (58) is provided with guide rings (54) and sealing rings (57) at intervals around its periphery. The bottom of the single-chamber cylinder body (53) is provided with an exhaust port and an oil inlet (52), and an exhaust nozzle (51) is provided in the exhaust port.

2. The hydraulically actuated single-cylinder brake according to claim 1, characterized in that, The sealing ring (57) is a Y-type sealing ring.

3. The hydraulically actuated single-cylinder brake according to claim 1, characterized in that, The single-chamber cylinder (53) is connected to the expansion assembly (3) by bolts.

4. The hydraulically actuated single-cylinder brake according to claim 1, characterized in that, The oil inlet (52) is equipped with an oil sealing nozzle (56) and an oil filling plug (55).

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