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CN-224197742-U - Service parking brake

CN224197742UCN 224197742 UCN224197742 UCN 224197742UCN-224197742-U

Abstract

The utility model relates to a driving parking brake, wherein a brake oil cylinder and a release oil cylinder are axially and separately arranged through a partition device, a brake piston is slidably arranged on the inner side of the brake oil cylinder, the release piston is slidably arranged on the inner side of the release oil cylinder, one end of the brake piston, which is far away from the release piston, is provided with a plurality of friction moving plates and friction static plates, the partition device, the brake piston, the release piston, the inner wall of the brake oil cylinder and the inner wall of the release oil cylinder jointly enclose a first oil cavity and a second oil cavity, and separation, engagement and pressurization engagement between the friction moving plates and the friction static plates are realized by controlling whether pressure oil is led into the first oil cavity and the second oil cavity. Compared with the prior art, the hydraulic braking system has the advantages that dynamic switching of driving release, parking braking and pressurizing braking is realized through double oil cavity design, the pressurizing braking mode is overlapped with hydraulic pressure and spring pressure, braking moment is obviously enhanced, the integrated partition device optimizes space layout, and the sealing design ensures that an oil way is free from leakage.

Inventors

  • LI KAIWEI

Assignees

  • 上海合纵重工机械有限公司

Dates

Publication Date
20260505
Application Date
20250620

Claims (6)

  1. 1. A service parking brake comprises a brake shaft (25), a plurality of friction moving plates (3) and friction static plates (4) which are arranged at intervals, a brake piston (5), a release piston (11), a brake cylinder (26), a release cylinder (21) and an end face flange, and is characterized in that the brake cylinder (26) and the release cylinder (21) are arranged in a separated mode in the axial direction through a separation device (24), the first axial side of the brake cylinder (26) is pressed by the first end face flange (1), the second axial side of the release cylinder (21) is pressed by the second end face flange (13), the brake piston (5) is slidably arranged on the inner side of the brake cylinder (26), the release piston (11) is slidably arranged on the inner side of the release cylinder (21), the brake piston (5) and the release piston (11) are arranged adjacently in the axial direction and transmit axial force through a screw (2), one end, far away from the release piston (11), of the brake piston (5) is provided with the friction moving plates (3) and the friction static plates (4), and the friction static plates (4) are connected with the brake cylinder (25) through the separation device (24) and the friction moving plates (25) in a sliding mode The inner walls of the release piston (11) and the brake cylinder (26) and the inner wall of the release cylinder (21) are enclosed together: A first oil chamber (29) located between the blocking device (24) and the brake piston (5), wherein the first oil chamber (29) is configured to push the brake piston (5) to move towards the friction plate (3) and the friction static plate (4) when pressure oil is introduced; The second oil cavity (30) is positioned between the isolating device (24) and the release piston (11), the second oil cavity (30) is configured to push the release piston (11) and the brake piston (5) which transmits axial force with the release piston to move in the direction opposite to the friction moving plate (3) and the friction static plate (4) when pressure oil is introduced, the end face of the release piston (11) opposite to the brake piston (5) is abutted against the belleville spring (12), the belleville spring (12) is pressed by the second end face flange (13), and the restoring force of the belleville spring (12) acts on the release piston (11) and can be transmitted to the friction static plate (4) through the brake piston (5).
  2. 2. A service park brake according to claim 1, wherein the brake cylinder (26) is provided with a first plug screw (7) in communication with the first oil chamber (29), and the release cylinder (21) is provided with a second plug screw (9) in communication with the second oil chamber (30).
  3. 3. A service park brake according to claim 2, wherein the first plug screw (7) and the second plug screw (9) are in communication with a fuel tank, the first plug screw (7) being configured to be filled with pressurized fuel only in a pressurized braking state, and the second plug screw (9) being configured to be filled with pressurized fuel only in a driving state and to be in communication with a fuel tank return in a parking state.
  4. 4. A service park brake as claimed in claim 1, characterized in that the brake piston (5) and the release piston (11) are connected by a brake piston screw (19) for transmitting axial forces.
  5. 5. A service park brake as claimed in claim 1, characterized in that a first sealing ring (6) is arranged between the brake piston (5) and the brake cylinder (26), a second sealing ring (10) is arranged between the release piston (11) and the release cylinder (21), and a third sealing ring (8) is arranged between the shut-off device (24) and the brake piston (5).
  6. 6. A service park brake as claimed in claim 1, characterized in that the end of the brake piston (5) remote from the release piston (11) rests against the friction plate (4).

Description

Service parking brake Technical Field The utility model relates to the technical field of brakes, in particular to a service parking brake. Background When the engineering machinery is temporarily stopped or suddenly braked on a steep slope, in order to prevent the car from sliding, a braking moment is added to the travelling mechanism, so that the safety accident caused by mechanical slippage is prevented. When the conventional normally closed brake is stopped temporarily or braked suddenly on a steep slope, the braking moment may be insufficient, and mechanical slip accidents are easily caused. To solve this problem, there is a need for a service parking brake structure capable of dynamically enhancing the braking torque. Disclosure of utility model The utility model aims to overcome the defects of the prior art and provide a service parking brake for improving the braking reliability by additionally increasing the braking moment under the action of pressure oil. In order to achieve the above purpose, a driving parking brake is designed, which comprises a brake shaft, a plurality of friction moving plates and friction static plates which are arranged at intervals, a brake piston, a release piston, a brake oil cylinder, a release oil cylinder and an end surface flange, wherein the brake oil cylinder and the release oil cylinder are arranged at intervals in the axial direction through a partition device; the axial first side of the brake cylinder is pressed by the first end face flange, the axial second side of the brake cylinder is pressed by the second end face flange, the brake piston is slidably arranged on the inner side of the brake cylinder, the brake piston and the brake piston are adjacently arranged in the axial direction and can transmit axial force, one end of the brake piston, which is far away from the brake piston, is provided with a plurality of friction sheets and friction static sheets, the friction static sheets are connected with the brake cylinder through splines, the friction sheets are connected with a brake shaft through the splines, the partition device, the brake piston, the inner wall of the brake cylinder and the inner wall of the brake cylinder are jointly enclosed, the first oil cavity is arranged between the partition device and the brake piston, the first oil cavity is configured to push the brake piston to move towards the friction sheets and the friction static sheets when pressure oil is introduced, the second oil cavity is arranged between the partition device and the brake piston, the second static sheets is configured to push the friction sheets to the friction sheets and the friction piston to the axial direction which is opposite to the axial direction of the brake piston and the butterfly spring, the friction sheets are pressed against the end face of the brake piston, the restoring force of the belleville spring acts on the release piston and can be transmitted to the friction static plate through the brake piston. Preferably, the utility model further comprises that the first screw plug is arranged on the brake cylinder and is communicated with the first oil cavity, and the second screw plug is arranged on the release cylinder and is communicated with the second oil cavity. Preferably, the utility model further comprises a first screw plug and a second screw plug which are communicated with the oil tank, wherein the first screw plug is configured to be filled with pressure oil only in a pressurizing braking state, and the second screw plug is configured to be filled with pressure oil only in a driving state and communicated with oil tank oil return in a parking state. Preferably, the utility model further comprises that the brake piston and the release piston are connected by a brake piston screw for transmitting axial forces. Preferably, the utility model further comprises a first sealing ring arranged between the brake piston and the brake cylinder, a second sealing ring arranged between the release piston and the release cylinder, and a third sealing ring arranged between the partition device and the brake piston. Preferably, the utility model further comprises that the end of the brake piston remote from the release piston abuts against the friction static plate. Compared with the prior art, the utility model has the advantages that: The dual-oil-cavity design realizes dynamic switching of driving release, parking braking and pressurizing braking, overlaps hydraulic pressure and spring pressure in a pressurizing braking mode, remarkably enhances braking moment, optimizes space layout by the integrated partition device, and ensures no leakage of an oil way by sealing design. Drawings FIG. 1 is a cross-sectional view of the present utility model; In the figure: the hydraulic brake system comprises a first end face flange, a first screw, a3 friction rotor, a4 friction static plate, a 5 brake piston, a6 first sealing ring, a 7 first screw plug, a 8 third sealing ri