Partitioned lever reinforcement type forklift braking device and forklift

Abstract

The utility model discloses a partitioned lever reinforcement type forklift braking device and a forklift. The device comprises a braking rod body and a braking rod cover which are connected in a sealed mode. An ejector rod is arranged in the brake rod body, and a first service brake oil hole and a second service brake oil hole are formed in the brake rod body and communicated with a service brake oil cavity in the brake rod body. A piston rod and an elastic piece are arranged in the brake rod cover; the piston rod is sleeved with the elastic piece and is in linkage with the ejector rod. A parking brake oil hole I and a parking brake oil hole II are formed in the brake rod cover and are communicated with a parking brake oil cavity in the brake rod cover; and a plurality of oil cavity sealing rings are further included, so that the parking braking oil cavity and the traveling braking oil cavity are independent. According to the utility model, a driving brake function and a parking brake function are integrated in one brake rod, but the two independent and separated oil cavities are designed and do not interfere with each other, the lever principle is fully utilized, the function safety risk is low, the occupied mounting space is small, and the brake rod is friendly to a hydraulic system of the whole vehicle.

Description

Technical Field

[0001] This utility model relates to the field of industrial vehicle technology, specifically to a zoned lever-assisted forklift braking device and forklift. Background Technology

[0002] The invention patent with publication number CN113212408A discloses a lever-type brake caliper. Currently, the lever-type forklift braking device is mainly used to achieve the service braking function and reduce the braking force through the lever principle, thereby reducing the requirements on the vehicle's hydraulic system. However, the way it achieves parking braking is still the traditional hand-cable type, which requires the driver to pull the handbrake after the vehicle stops to achieve parking braking. Since parking braking requires manual operation, this method has certain functional safety risks. At the same time, the installation space occupied by the handbrake structure is relatively large.

[0003] To circumvent the aforementioned problems, invention publication DE102022207092A1 proposes a parking brake method that uses a spring to provide parking brake force. When the vehicle is parked, the spring force lifts the brake lever and presses the friction pair together through the brake pin to achieve parking brake. When the vehicle is moving, hydraulic oil presses the piston to compress the spring, lowers the brake lever, and releases the parking brake. Although this method avoids the functional safety risks of parking brake operation, due to its structural limitations, when the vehicle is in service braking mode, some of the hydraulic oil used to release the parking brake needs to be squeezed back into the hydraulic lines. At this time, the instantaneous oil pressure in the hydraulic lines becomes very high, which increases the requirements for the entire vehicle's hydraulic system piping and control.

[0004] Patent CN118328097A discloses an integrated forklift brake lever. This patent combines the service brake and parking brake functions into a single brake lever body, using spring pressure to provide parking braking force, eliminating the need for a traditional parking brake handbrake system. Two oil chambers are designed within the brake lever cavity: one provides the hydraulic pressure to release the parking brake, and the other provides the hydraulic pressure for the service brake. By supplying different pressure oils to the two chambers, both parking brake release and service brake functions can be achieved, requiring only one brake lever to perform both braking functions. However, during service braking, the hydraulic oil needs to be squeezed back into the pipeline, which is the same problem as with patent DE102022207092A1.

[0005] In conclusion, there is currently no lever-assisted forklift braking device that can simultaneously meet all the requirements of low functional safety risk, small installation space, and low requirements for the vehicle's hydraulic system. Utility Model Content

[0006] The technical problem to be solved by this utility model is to propose a partitioned lever-type forklift braking device, which integrates parking and driving braking functions into a single brake lever, while completely separating the hydraulic cylinders that perform the two functions, so that the two hydraulic cylinders do not interfere with each other when they are working.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A partitioned lever-assisted forklift braking device includes: a brake lever body 10 and a brake lever cover 20 that are sealed together.

[0009] The brake lever body 10 is equipped with a push rod 11, and the brake lever body 10 is provided with a service brake oil hole 12 and a service brake oil hole 13, which are connected to the service brake oil chamber 14 inside the brake lever body 10.

[0010] The brake lever cover 20 contains a piston rod 21 and an elastic element 22; the elastic element 22 is sleeved on the piston rod 21, and the piston rod 21 is linked with the push rod 11.

[0011] The brake lever cover 20 is provided with a parking brake oil hole 1 23 and a parking brake oil hole 24, which are connected to the parking brake oil chamber 25 inside the brake lever cover 20.

[0012] In addition, it also includes oil chamber sealing ring 1 31, oil chamber sealing ring 2 32 and oil chamber sealing ring 33, which are located on piston rod 21, brake rod body 10 and push rod 11 respectively, so that parking brake oil chamber 25 is located between oil chamber sealing ring 1 31 and oil chamber sealing ring 2 32, and service brake oil chamber 14 is located between oil chamber sealing ring 2 32 and oil chamber sealing ring 33.

[0013] In one embodiment of this utility model, a stop block 15 and a retaining ring 16 are provided inside the brake lever body 10;

[0014] The stop block 15 is located on the stepped side of the top rod 11 to limit the top rod 11. The retaining ring 16 is located at the outlet end of the brake lever body 10, and the stop block 15 is located between the stepped side of the top rod 11 and the retaining ring 16.

[0015] In one embodiment of the present invention, a release nut 26 is provided at the tail of the brake lever cover 20; and the release nut 26 is connected to the piston rod 21.

[0016] In one embodiment of the present invention, a dustproof ring 27 is provided inside the brake lever cover 20; and the dustproof ring 27 is sleeved on the release nut 26.

[0017] In one embodiment of this utility model, when the service brake oil port 12 is connected to hydraulic oil through the oil pipe 41, a vent valve 17 is installed on the service brake oil port 13; or, when the service brake oil port 13 is connected to hydraulic oil through the oil pipe 41, a vent valve 17 is installed on the service brake oil port 12.

[0018] In one embodiment of this utility model, when the parking brake oil port 23 is connected to hydraulic oil through the oil pipe 42, a vent valve 2 is installed on the parking brake oil port 24; or, when the parking brake oil port 24 is connected to hydraulic oil through the oil pipe 42, a vent valve 2 is installed on the parking brake oil port 23.

[0019] In one embodiment of this utility model, the size of the service brake oil chamber 14 is smaller than the size of the parking brake oil chamber 25.

[0020] In one embodiment of this utility model, the positions of the first service brake oil hole 12 and the second service brake oil hole 13 are symmetrical on the brake lever body 10.

[0021] The positions of parking brake oil hole 1 23 and parking brake oil hole 24 are symmetrical on the brake lever cover 20.

[0022] In one embodiment of this utility model, the brake lever body 10 is connected to the vehicle drive device via a pin 51.

[0023] This utility model also provides a forklift that uses the aforementioned partitioned lever-assisted forklift braking device.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This utility model integrates the service braking function and the parking braking function into a single brake lever, avoiding the functional safety risks during parking braking. At the same time, it makes full use of the lever effect, reducing the braking force required from the vehicle's hydraulic system. Furthermore, it separates the oil chambers for parking braking and service braking, ensuring that the two hydraulic lines do not interfere with each other, thus reducing the requirements for the vehicle's hydraulic pipelines and controls.

[0026] In addition, this utility model also designs a multifunctional release nut, which can be used to release the parking brake when the vehicle's hydraulic system is not working, and can also act as a limit to prevent the spring from suddenly popping out when the brake lever is being repaired, thus increasing the convenience and safety of maintenance.

[0027] The system integrates both driving and parking brake functions within a single brake lever, yet features two separate hydraulic chambers designed to prevent interference. This design fully utilizes the lever principle, resulting in low functional safety risks, minimal installation space requirements, and compatibility with the vehicle's overall hydraulic system. The symmetrical oil port design accommodates various installation methods and ensures stable chamber air pressure.

[0028] Previously, the diameter of the service brake oil chamber and the parking brake oil chamber were the same. Now, due to the partitioned design, the diameter of the hydraulic cylinder for the service brake can be designed to be smaller, which requires less oil and results in a faster braking response time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a partitioned lever-assisted forklift braking device according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the brake lever body and brake lever cover according to an embodiment of the present utility model.

[0031] Figure 3 This is a schematic diagram showing the connection between the brake lever body and the brake lever cover in an embodiment of this utility model.

[0032] Figure 4 This is a schematic diagram of the oil cavity sealing ring according to an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the parking brake state according to an embodiment of the present utility model.

[0034] Figure 6 This is a schematic diagram of the parking brake release state according to an embodiment of the present utility model.

[0035] Figure 7 This is a schematic diagram of the vehicle braking state according to an embodiment of the present utility model.

[0036] Figure 8 This is a schematic diagram of the manual release state according to an embodiment of the present invention.

[0037] Figure 9 This is a schematic diagram of the disassembled state of an embodiment of the present invention. Detailed Implementation

[0038] To facilitate understanding of the technical solution of this utility model by those skilled in the art, the technical solution of this utility model will now be further described in conjunction with the accompanying drawings.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] Please see Figure 1 and Figure 2As shown, this utility model provides a partitioned lever-type forklift braking device, including: a brake lever body 10 and a brake lever cover 20 that are sealed together.

[0041] The brake lever body 10 contains a push rod 11. The brake lever body 10 has a service brake fluid port 12 and a service brake fluid port 13, which communicate with the service brake fluid chamber 14 inside the brake lever body 10. Furthermore, the positions of the service brake fluid port 12 and the service brake fluid port 13 are symmetrical on the brake lever body 10.

[0042] The brake lever cover 20 contains a piston rod 21 and an elastic element 22. The elastic element 22 is sleeved on the piston rod 21, and the piston rod 21 is linked with the push rod 11. Specifically, the elastic element 22 is a spring.

[0043] The brake lever cover 20 is provided with a parking brake fluid port 23 and a parking brake fluid port 24, which communicate with the parking brake fluid chamber 25 inside the brake lever cover 20. Furthermore, the positions of the parking brake fluid port 23 and the parking brake fluid port 24 are symmetrical on the brake lever cover 20.

[0044] Furthermore, it also includes oil chamber sealing rings 31, 32, and 33, located on the piston rod 21, brake lever body 10, and push rod 11 respectively. This positions the parking brake oil chamber 25 between oil chamber sealing rings 31 and 32, and the service brake oil chamber 14 between oil chamber sealing rings 32 and 33, achieving mutual sealing between the service brake oil chamber 14 and the parking brake oil chamber 25 and preventing wear of the sealing rings. Specifically, oil chamber sealing rings 31, 32, and 33 are sealing rings with wear-resistant rings. Also, the size of the service brake oil chamber 14 is smaller than the size of the parking brake oil chamber 25.

[0045] Please see Figures 1 to 4 As shown, in one embodiment of this utility model, the brake lever body 10 is connected to the brake lever cover 20 by bolts 120, and the two are sealed by sealing ring 121.

[0046] In this embodiment, a stop block 15 and a retaining ring 16 are provided inside the brake lever body 10. The stop block 15 is located on the stepped side of the push rod 11, limiting the push rod 11. The retaining ring 16 is located at the outlet end of the brake lever body 10, and the stop block 15 is located between the stepped side of the push rod 11 and the retaining ring 16. The push rod 11 and the stop block 15 are tightly fixed inside the brake lever body 10 by the retaining ring 16.

[0047] In this embodiment, when the service brake oil port 12 is connected to hydraulic oil through the oil pipe 41, a vent valve 17 is installed on the service brake oil port 13. Conversely, when the service brake oil port 13 is connected to hydraulic oil through the oil pipe 41, a vent valve 17 is installed on the service brake oil port 12.

[0048] Please see Figures 1 to 4 As shown, in one embodiment of this utility model, a release nut 26 is installed at the tail of the brake lever cover 20, and the release nut 26 is connected to the piston rod 21. A dustproof ring 27 is provided inside the brake lever cover 20, and the dustproof ring 27 is sleeved on the release nut 26.

[0049] In this embodiment, when the parking brake oil port 23 is connected to hydraulic oil through the oil pipe 42, a vent valve 2 is installed on the parking brake oil port 24. Conversely, when the parking brake oil port 24 is connected to hydraulic oil through the oil pipe 42, a vent valve 2 is installed on the parking brake oil port 23.

[0050] Please see Figures 1 to 4 As shown, in this embodiment, the brake lever body 10 is connected to the vehicle drive unit via a pin 51. Specifically, the top of the brake lever body 10 is machined with a brake pin hole 18, which cooperates with the brake pin 110. When the brake lever body 10 is lifted, the brake pin 110 presses against the brake friction pair 120 inside the vehicle drive unit, thereby braking the vehicle.

[0051] Please see Figures 1 to 4 As shown, in one embodiment of this utility model, when the vehicle is parked, the elastic element 22 pushes the piston rod 21, which in turn pushes the push rod 11 to lift the brake lever 10, thus enabling the vehicle to perform the parking brake function. Figure 5 As shown.

[0052] As shown in Figure 6, when the vehicle starts, hydraulic oil enters the parking brake chamber 25 through either parking brake oil port 23 or parking brake oil port 24, thereby pushing the piston rod 21 to move and compressing the elastic element 22. At this time, the brake lever 10 is released, and the parking brake is disengaged. During this process, if hydraulic oil enters parking brake oil port 23 from oil pipe 22, a vent valve 2 is installed in parking brake oil port 24 to ensure the stability of the air pressure inside the chamber, and vice versa.

[0053] like Figure 7 As shown, when the vehicle needs to apply the service brake, the hydraulic oil in the parking brake chamber 25 is continuously supplied. Simultaneously, another line of hydraulic oil enters the service brake chamber 14 through either service brake oil port 12 or service brake oil port 13, thereby pushing the push rod 11 to lift the brake lever 10, thus achieving the service brake function. During this process, if hydraulic oil enters the service brake oil port 12 from the oil pipe 41, a vent valve 17 is installed in the service brake oil port 13 to ensure the stability of the internal air pressure, and vice versa.

[0054] like Figure 8 As shown, when the vehicle malfunctions and the hydraulic system fails, the vehicle will be in a state of... Figure 5As shown in the parking brake state, the release nut 26 can be turned around and gradually tightened. By tightening the release nut 26, the piston rod 21 is pulled to compress the elastic element 22, so that the brake lever 10 is lowered, the parking brake is released, and the vehicle can be moved for easy maintenance.

[0055] like Figure 9 As shown, when the brake lever needs to be repaired, the bolt 120 needs to be removed first. In order to prevent the elastic element 22 from suddenly popping open the brake lever cover 20, the hexagonal head of the release nut 26 can act as a limiting structure to fix the position of the elastic element 22 and the piston rod 21, thus avoiding functional safety risks.

[0056] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] The above-described embodiments are merely examples of implementation methods of the utility model. The scope of protection of this utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the scope of protection of this utility model.

Claims

1. A zoned lever-assisted forklift braking device, characterized in that, include: The brake lever body (10) and brake lever cover (20) are sealed together. The brake lever body (10) is equipped with a push rod (11), and the brake lever body (10) is provided with a first service brake oil hole (12) and a second service brake oil hole (13), which are connected to the service brake oil chamber (14) inside the brake lever body (10); The brake lever cover (20) contains a piston rod (21) and an elastic element (22); the elastic element (22) is sleeved on the piston rod (21), and the piston rod (21) is linked with the push rod (11); The brake lever cover (20) is provided with a parking brake oil hole one (23) and a parking brake oil hole two (24), which are connected to the parking brake oil chamber (25) inside the brake lever cover (20); In addition, it also includes oil chamber sealing ring one (31), oil chamber sealing ring two (32) and oil chamber sealing ring three (33), which are located on piston rod (21), brake rod body (10) and push rod (11) respectively, so that the parking brake oil chamber (25) is located between oil chamber sealing ring one (31) and oil chamber sealing ring two (32), and the service brake oil chamber (14) is located between oil chamber sealing ring two (32) and oil chamber sealing ring three (33).

2. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, The brake lever body (10) is provided with a stop (15) and a retaining ring (16) inside. The stop block (15) is set on the stepped side of the top rod (11) to limit the top rod (11). The retaining ring (16) is located at the outlet end of the brake lever body (10), and the stop block (15) is located between the stepped side of the top rod (11) and the retaining ring (16).

3. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, The brake lever cover (20) is fitted with a release nut (26) at its tail; and the release nut (26) is connected to the piston rod (21).

4. The zoned lever-assisted forklift braking device according to claim 3, characterized in that, The brake lever cover (20) is provided with a dustproof ring (27); and the dustproof ring (27) is fitted onto the release nut (26).

5. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, When the service brake oil hole one (12) is connected to hydraulic oil through the oil pipe one (41), the service brake oil hole two (13) is equipped with the vent valve one (17); or, when the service brake oil hole two (13) is connected to hydraulic oil through the oil pipe one (41), the service brake oil hole one (12) is equipped with the vent valve one (17).

6. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, When the parking brake oil hole 1 (23) is connected to hydraulic oil through the oil pipe 2 (42), the vent valve 2 is installed on the parking brake oil hole 2 (24), or when the parking brake oil hole 2 (24) is connected to hydraulic oil through the oil pipe 2 (42), the vent valve 2 is installed on the parking brake oil hole 1 (23).

7. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, The size of the service brake fluid chamber (14) is smaller than the size of the parking brake fluid chamber (25).

8. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, The positions of the service brake oil hole one (12) and the service brake oil hole two (13) are symmetrical on the brake lever body (10); The positions of parking brake oil hole one (23) and parking brake oil hole two (24) are symmetrical on the brake lever cover (20).

9. The zoned lever-assisted forklift braking device according to claim 1, characterized in that, The brake lever (10) is connected to the vehicle drive unit via a pin (51).

10. A forklift, characterized in that, The partitioned lever-assisted forklift braking device according to any one of claims 1-9 is applied.

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