Parking brake protection device

Abstract

The utility model discloses a parking brake protection device, and relates to the technical field of parking brakes, which comprises an oil seal seat, an oil seal is mounted in the oil seal seat, a parking brake is fixed at the right end of the oil seal seat, a brake drum is arranged at the right end of the parking brake, an output flange is fixed in the brake drum, and the output flange is connected with the oil seal seat. A gear shaft is inserted into the oil seal seat and the output flange; an oil seal mounting hole for mounting an oil seal is formed in the oil seal seat, the right side of the oil seal seat is a brake mounting surface attached to a brake, the left side of the oil seal seat is a reduction gearbox mounting surface attached to a reduction gearbox, and an oil discharge port is formed in the bottom of the oil seal seat. The installation structure is reliable in installation. After being pressed into the oil seal seat, the oil seal is integrally sleeved into the gear shaft, the oil seal seat is light in weight, oil seal lips are protected from being damaged in the installation operation and installation process, and the hidden danger of sealing leakage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of parking brake technology, and in particular to a parking brake protection device. Background Technology

[0002] The parking brake of a forklift is usually located on the shaft of the gearbox. When braking, it cuts off the transmission of power by limiting the rotation of the shaft.

[0003] However, the gearbox contains lubricating oil, so a sealing ring is needed to prevent oil leakage. If the sealing ring fails, the oil will contaminate the brake and cause braking failure.

[0004] Therefore, the reliability of seal installation, ease of maintenance, and protection of the brake are key aspects of gearbox structural design. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this utility model is to propose a parking brake protection device. The lightweight oil seal seat facilitates installation and operation, protecting the oil seal lip from damage during installation and reducing the risk of seal leakage.

[0006] According to the present utility model, the parking brake protection device includes an oil seal seat, an oil seal is installed inside the oil seal seat, a parking brake is fixed to the right end of the oil seal seat, a brake drum is provided at the right end of the parking brake, an output flange is fixed inside the brake drum, and a gear shaft is inserted inside the oil seal seat and the output flange.

[0007] The oil seal seat has an oil seal mounting hole inside for installing the oil seal. The right side of the oil seal seat is a brake mounting surface that fits with the brake. The left side of the oil seal seat is a gearbox mounting surface that fits with the gearbox. The bottom of the oil seal seat has an oil discharge port. The right side of the oil seal seat has at least two threaded holes. The bottom of the oil seal seat has a through hole.

[0008] Preferably, a locking nut is provided inside the output flange, and a washer is provided between the locking nut and the output flange.

[0009] Preferably, the gear shaft has a fixed stepped shaft at the center of the left side, and the stepped shaft includes a left bearing support surface, a sealing surface, an output flange centering surface, a spline, a thread, and a locking groove.

[0010] Preferably, the left side of the locking nut is a flat surface that fits against the washer, and the right side is provided with a thin-walled ring that mates with the locking groove.

[0011] Preferably, a paper gasket is provided between the gearbox mounting surface and the gearbox mating surface on the oil seal seat.

[0012] The beneficial effects of this utility model are:

[0013] 1. Reliable installation. After the oil seal is pressed into the oil seal seat, it is fitted into the gear shaft as a whole. The lightweight oil seal seat facilitates installation and operation, and protects the oil seal lip from damage during the installation process, reducing the risk of seal leakage.

[0014] 2. Easy maintenance. When the oil seal needs to be replaced, it is not necessary to disassemble the gearbox; only the oil seal seat needs to be removed for replacement. This reduces the workload and increases efficiency.

[0015] 3. Low maintenance costs and improved brake protection. Even if the oil seal fails, the leaked oil will drain out through the drain port and will not enter the brake, thus preventing brake failure. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the parking brake protection device proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the oil seal seat structure of the parking brake protection device proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of the locking nut structure of the parking brake protection device proposed in this utility model.

[0019] Figure 4 This is a schematic diagram of the gear shaft structure of the parking brake protection device proposed in this utility model.

[0020] In the diagram: 1. Oil seal seat; 2. Paper gasket; 3. Oil seal; 4. Gear shaft; 5. Output flange; 6. Brake drum; 7. Locking nut; 8. Parking brake; 9. Washer; 11. Oil seal mounting hole; 12. Brake mounting surface; 13. Gearbox mounting surface; 14. Oil drain port; 15. Threaded hole; 16. Through hole; 41. Bearing support surface; 42. Sealing surface; 43. Output flange centering surface; 44. Spline; 45. Thread; 46. Locking groove; 701. Thin-walled ring; 702. Flat surface. Detailed Implementation

[0021] Reference Figure 1-4 The parking brake protection device includes an oil seal seat 1, an oil seal 3 is installed inside the oil seal seat 1 to ensure that the oil seal 3 forms an interference fit with the hole wall after being pressed in, so as to avoid oil leakage due to gaps. The parking brake 8 is fixed at the right end of the oil seal seat 1, and a brake drum 6 is provided at the right end of the parking brake 8. The brake drum 6 is connected to the output flange 5 by bolts. The output flange 5 is fixed inside the brake drum 6. A gear shaft 4 is inserted inside the oil seal seat 1 and the output flange 5.

[0022] The oil seal seat 1 has an oil seal mounting hole 11 for installing the oil seal 3 inside. The right side of the oil seal seat 1 is a brake mounting surface 12 that fits with the brake, and the left side of the oil seal seat 1 is a gearbox mounting surface 13 that fits with the gearbox. Both the brake mounting surface 12 on the right side and the gearbox mounting surface 13 on the left side of the oil seal seat 1 are flat surfaces 702. The bottom of the oil seal seat 1 has an oil drain port 14. The oil drain port 14 is located at the bottom of the oil seal seat 1 and can quickly guide leaked lubricating oil to the outside. The right side of the oil seal seat 1 has at least two threaded holes 15 for connecting the parking brake 8. The bottom of the oil seal seat 1 has a through hole 16 for installing the gearbox.

[0023] The output flange 5 is equipped with a locking nut 7 inside, and a washer 9 is provided between the locking nut 7 and the output flange 5. The output flange 5 is axially fixed by the locking nut 7 and the washer 9.

[0024] A stepped shaft is fixed at the center of the left side of the gear shaft 4. The stepped shaft includes a left bearing support surface 41, a sealing surface 42, an output flange centering surface 43, a spline 44, a thread 45, and a locking groove 46. The bearing support surface 41 is used to support the bearing, the sealing surface 42 is used to seal with the oil seal 3, the output flange centering surface 43 is used to center the output flange 5, the external spline 44 mates with the internal spline 44 of the output flange 5, and the thread 45 is threaded to the lock nut 7. The anti-loosening effect is achieved by hammering the thin-walled ring 701 into the locking groove 46.

[0025] The left side of the locking nut 7 is a flat surface 702 that fits against the washer 9, and the right side is provided with a thin-walled ring 701 that mates with the locking groove 46.

[0026] A paper gasket 2 is provided between the gearbox mounting surface 13 on the oil seal seat and the gearbox mating surface. During assembly, a sealing barrier is formed through the mating surface of the paper gasket 2.

[0027] When using this device, after the gearbox is assembled, first gently slide the oil seal seat 1, which contains the oil seal 3, onto the gear shaft 4. The gearbox mounting surface 13 mates with the corresponding surface of the gearbox, and then the gear is tightened using the through hole 16 and bolts. A paper gasket 2 is placed between the gearbox mounting surface 13 and the gearbox mating surface to achieve a seal. Then, the parking brake 8 is fitted onto the gear shaft 4 and positioned against the brake mounting surface 12. It is then tightened into the threaded hole 15 of the oil seal seat 1 using bolts. In this way, the parking brake 8, oil seal seat 1, and gearbox housing are all secured as a single unit. Next, the output flange 5 is inserted into the gear shaft 4 through the central hole of the parking brake 8. The gear shaft 4 has a spline 44 that mates with the internal spline of the output flange 5, allowing the gear shaft 4 and output flange 5 to rotate synchronously. Mounting holes are designed on the output flange 5 for connecting the brake drum 6, so that the brake drum 6 moves synchronously with the output flange 5 and the gear shaft 4. By screwing the lock nut 7 into the thread 45, once the lock nut 7 is in the appropriate position, the flat surface 702 presses the output flange 5 against the washer 9. At this time, the thin-walled ring 701 is deformed by hammering and embedded into the locking groove 46 to achieve an anti-loosening effect. At the same time, the output flange 5 is axially fixed by the lock nut 7 and the washer 9, thus achieving installation and sealing. When the vehicle requires the parking brake function, pulling the brake cable causes the brake shoes to expand and rub against the brake drum 6, forcing the brake drum 6 and the gear shaft 4 to stop rotating, interrupting power transmission.

Claims

1. A parking brake protection device, characterized in that: Includes an oil seal seat (1), an oil seal (3) is installed inside the oil seal seat (1), a parking brake (8) is fixed at the right end of the oil seal seat (1), a brake drum (6) is provided at the right end of the parking brake (8), an output flange (5) is fixed inside the brake drum (6), and a gear shaft (4) is inserted inside the oil seal seat (1) and the output flange (5). The oil seal seat (1) has an oil seal mounting hole (11) for installing the oil seal (3) inside. The right side of the oil seal seat (1) is a brake mounting surface (12) that fits with the brake. The left side of the oil seal seat (1) is a gearbox mounting surface (13) that fits with the gearbox. The bottom of the oil seal seat (1) has an oil discharge port (14). The right side of the oil seal seat (1) has at least two threaded holes (15). The bottom of the oil seal seat (1) has a through hole (16).

2. The parking brake protection device according to claim 1, characterized in that: A locking nut (7) is provided inside the output flange (5), and a washer (9) is provided between the locking nut (7) and the output flange (5).

3. The parking brake protection device according to claim 1, characterized in that: The gear shaft (4) has a fixed stepped shaft on the left center. The stepped shaft includes a bearing support surface (41), a sealing surface (42), an output flange centering surface (43), a spline (44), a thread (45), and a locking groove (46) arranged from left to right.

4. The parking brake protection device according to claim 2, characterized in that: The left side of the locking nut (7) is a flat surface (702) that fits with the washer (9), and the right side of the locking nut (7) is provided with a thin-walled ring (701) that cooperates with the locking groove (46).

5. The parking brake protection device according to claim 1, characterized in that: A paper gasket (2) is provided between the gearbox mounting surface (13) on the oil seal seat (1) and the gearbox mating surface.

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