Wet brake drive axle structure of forklift

Abstract

The forklift wet type brake drive axle structure comprises a main speed reducer assembly, an axle body assembly, a half shaft, hub reduction gears, hubs and a wet type brake assembly, the axle body assembly covers the outer side circumference of the half shaft, the main speed reducer assembly is arranged in the middle of the half shaft, and the two hub reduction gears are arranged at the two ends of the half shaft respectively. The two hubs are arranged on the inner sides of the two hub reducers correspondingly, and the two wet brake assemblies are fixedly connected with the hubs through bolts correspondingly. The wet brake assembly comprises a brake piston, a clutch disc, a disc type friction plate and a brake flange, the brake piston, the clutch disc, the disc type friction plate and the brake flange are sequentially arranged, and the brake flange is fixedly connected to the hub through bolts. The forklift wet type drive axle is compact in structure, large in braking torque, high in braking stability, good in sealing performance, high in anti-pollution capacity, good in cooling effect, not limited to the use environment and long in maintenance period.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle drive axles, in particular to a forklift wet brake drive axle structure. Background Art

[0002] The braking torque of the traditional forklift drive axle is provided by shoe-type or caliper-disc brakes, and both are dry brakes. The brakes are in an "open" state. When the forklift is used in a relatively harsh environment (such as chemical plants, stone factories with a lot of dust, coal mines and refineries, etc.), if the brakes are not maintained in time, the brake hub and brake disc will be corroded and worn early, the brake friction pads will be stained with oil, and the brakes will fail. The heat energy generated during the braking process of shoe-type and caliper-disc brakes is cooled by natural ventilation, and the cooling effect is poor. Once the forklift brakes frequently during use, the thermal stability of the brake friction pads is affected, and the braking performance decreases accordingly. Structurally, the size of the shoe-type brake is limited by the axial size and inner diameter of the tire rim, and it is difficult to increase the friction area, so the braking torque is small. Since the brake friction area is small and the pressure per unit area is relatively high, the caliper brake must use high-performance friction pads, which are costly and difficult to assemble.

[0003] Currently, wet brakes are mostly used in engineering machinery vehicles and are rarely used in forklifts. Therefore, it is very necessary to study a suitable wet drive axle structure and apply it to forklifts to improve the braking stability of the forklift drive axle and break the environmental limitations of the forklift drive axle. Summary of the invention

[0004] In view of the deficiencies of the prior art, an object of the present invention is to provide a forklift wet brake drive axle structure to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A forklift wet brake drive axle structure, including a main reducer assembly, a bridge body assembly, a half-axle, a wheel-side reducer, a wheel hub, and a wet brake assembly. The bridge body assembly is covered and arranged on the outer circumference of the half-axle, the main reducer assembly is arranged in the middle of the half-axle, two wheel-side reducers are provided and are respectively arranged at the two ends of the half-axle, two wheel hubs are provided and are respectively arranged on the bridge body assembly on the inner side of the two wheel-side reducers, the wheel-side reducers are connected and fixed to the wheel hubs in a one-to-one correspondence, two wet brake assemblies are provided and are respectively arranged on the bridge body assembly on the inner side of the two wheel hubs, and the wet brake assembly is fixed to the wheel hub by bolts; the wet brake assembly includes a brake piston, a clutch plate, a disc friction plate, and a brake flange, and the brake piston, clutch plate, disc friction plate, and brake flange are arranged in sequence, and the brake flange is fixed to the wheel hub by bolts.

[0007] Preferably, the main reducer assembly is connected to the forklift internal combustion engine through a transmission shaft, and the forklift internal combustion engine provides input power to the main reducer assembly, half shafts, wheel-side reducers, wheel hubs, and wet brake assemblies through the transmission shaft, while achieving a first-stage reduction in the main reducer assembly.

[0008] Preferably, the disc friction plate is composed of five static friction plates and four dynamic friction plates, and the five static friction plates and the four dynamic friction plates are alternately stacked in sequence.

[0009] Preferably, the wet brake assembly is provided with a brake oil inlet and a brake pump, and the brake oil inlet is connected to the brake pump through an oil pipe.

[0010] Preferably, a piston sealing ring is provided on the outside of the brake piston, and the piston sealing ring is a BY ring. The brake piston controls braking through a brake pump, and the brake pump is sealed through the piston sealing ring, which can enable the brake piston to obtain stable braking pressure and reduce the resistance during the resetting process of the brake piston when the pressure is released.

[0011] Preferably, the dynamic friction plate is connected to the brake flange via a spur gear, and a floating oil seal is provided between the dynamic friction plate and the brake flange to achieve external sealing of the wheel hub and the brake flange as a whole.

[0012] Preferably, the heat energy generated by the friction between the static friction plate and the dynamic friction plate is absorbed by the gear oil from the wheel-side reducer.

[0013] Preferably, a return spring is provided in the wet brake assembly, and the return spring is connected and acts on the clutch plate.

[0014] The beneficial effects of the present invention are:

[0015] The forklift wet brake drive axle structure of the present invention adopts a plurality of disc-type static friction plates and disc-type dynamic friction plates to be alternately stacked in sequence, which can easily increase the friction area, so the braking torque is large and the braking effect is obvious; the heat energy generated by the friction between the static friction plates and the dynamic friction plates is absorbed by the gear oil from the wheel-side reducer, which has strong heat dissipation, good thermal stability and stable braking effect. The forklift wet drive axle of the present invention has a compact structure, large braking torque, high braking stability, good sealing, strong anti-pollution ability, good cooling effect, is not limited to the use environment and has a long maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the structure of the present invention;

[0017] Figure 2 : Schematic diagram of the wet brake assembly structure of the present invention. DETAILED DESCRIPTION

[0018] Combined with Figure 1-2 , the specific implementation mode of the present invention is described as follows:

[0019] like Figure 1-2 As shown, a forklift wet brake drive axle structure includes a main reducer assembly 1, a bridge assembly 2, a half shaft 3, a wheel-side reducer 4, a wheel hub 5, and a wet brake assembly 6. The bridge assembly 2 is covered and arranged on the outer circumference of the half shaft 3, the main reducer assembly 1 is arranged in the middle of the half shaft 3, two wheel-side reducers 4 are arranged and are respectively arranged at both ends of the half shaft 3, two wheel hubs 5 are arranged and are respectively arranged on the bridge assembly 2 on the inner side of the two wheel-side reducers 4, the wheel-side reducers 4 and the wheel hubs 5 are connected and fixed one by one, and the wet brake assembly 6 is provided. There are two damper assemblies 6, which are respectively arranged on the bridge assembly 2 inside the two wheel hubs 5. The wet brake assembly 6 is fixed to the wheel hub 5 by bolts. The main reducer assembly 1 is connected to the forklift internal combustion engine through the transmission shaft. The forklift internal combustion engine provides input power to the main reducer assembly 1, the half shaft 3, the wheel reducer 4, the wheel hub 5, and the wet brake assembly 6 through the transmission shaft, and realizes the primary reduction of the main reducer assembly 1 at the same time. The main reducer assembly 1 transmits power to the wheel reducer 4 through the half shaft 3 to realize the secondary reduction. The wheel reducer 4 finally transmits power to the wheel hub 5 to realize the rotation of the wheel hub 5 and drive the whole vehicle to move.

[0020] The wet brake assembly 6 includes a brake piston 61, a clutch plate 62, a disc friction plate 63, and a brake flange 64. The brake piston 61, the clutch plate 62, the disc friction plate 63, and the brake flange 64 are arranged in sequence, and the brake flange 64 is fixed to the wheel hub 5 by bolt connection. The disc friction plate 63 is composed of five static friction plates 631 and four dynamic friction plates 632, and the five static friction plates 631 and the four dynamic friction plates 632 are alternately stacked together in sequence. The heat energy generated by the friction between the static friction plates 631 and the dynamic friction plates 632 is absorbed by the gear oil from the wheel side reducer 4. The dynamic friction plate 632 is connected to the brake flange 64 through a spur gear, and a floating oil seal 65 is arranged between the dynamic friction plate 632 and the brake flange 64 to achieve the overall external sealing of the wheel hub 5 and the brake flange 64.

[0021] The wet brake assembly 6 is provided with a brake oil inlet 67 and a brake pump 68. The brake oil inlet 67 is connected to the brake pump 68 through an oil pipe. A piston seal 611 is provided on the outside of the brake piston 61. The piston seal 611 is a BY ring. The brake piston 61 is controlled by the brake pump 68. The brake pump 68 is sealed by the piston seal 611, which can make the brake piston 61 obtain a stable brake pressure and reduce the resistance of the brake piston 61 in the process of resetting when the pressure is released.

[0022] Six return springs 66 are provided in the wet brake assembly 6 , and the return springs 66 are connected to act on the clutch plate 62 .

[0023] During the operation of the wet drive axle of the forklift of the present invention, the operator steps on the foot brake, the forklift hydraulic pump system works, and a braking power source is generated; the hydraulic oil enters the brake pump 68 through the brake oil inlet 67, the brake pump 68 works, the hydraulic oil pushes the brake piston 61 to move, the brake piston 61 pushes the clutch plate 62 to move, and the five static friction plates 631 and the four dynamic friction plates 632 are pressed together step by step, so that friction is generated between the static friction plates 631 and the dynamic friction plates 632, and the dynamic friction plates 632 are prevented from rotating; the dynamic friction plates 632 transmit the braking resistance torque to the wheel hub 5 through the brake flange 64, forcing the wheel hub 5 to slow down until it stops. When the braking is ended, the brake pump 68 does not work, and the braking pressure disappears. At this time, the six return springs 66 generate a return spring force and push the clutch plate 62 to reset, causing the static friction plates 631 and the dynamic friction plates 632 to separate instantly, and the friction resistance disappears.

[0024] The wet-type drive axle for a forklift of the present invention has a compact structure, a large braking torque, high braking stability, good sealing performance, strong anti-pollution capability, good cooling effect, is not limited to the use environment and has a long maintenance cycle.

[0025] The above is an exemplary description of the invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A forklift wet brake drive axle structure, characterized in that: The invention comprises a main reducer assembly (1), a bridge assembly (2), a half shaft (3), a wheel reducer (4), a wheel hub (5), and a wet brake assembly (6), wherein the bridge assembly (2) is arranged on the outer circumference of the half shaft (3), the main reducer assembly (1) is arranged in the middle of the half shaft (3), two wheel reducers (4) are arranged at two ends of the half shaft (3), two wheel hubs (5) are arranged on the bridge assembly (2) on the inner side of the two wheel reducers (4), and the wheel reducers (4) and the wheel hubs (5) are connected in a one-to-one correspondence. The wet brake assembly (6) is connected and fixed, two of the wet brake assemblies (6) are respectively arranged on the bridge body assembly (2) on the inner side of the two wheel hubs (5), and the wet brake assembly (6) is fixed to the wheel hub (5) by bolt connection; the wet brake assembly (6) comprises a brake piston (61), a clutch plate (62), a disc friction plate (63), and a brake flange (64), and the brake piston (61), the clutch plate (62), the disc friction plate (63), and the brake flange (64) are arranged in sequence, and the brake flange (64) is fixed to the wheel hub (5) by bolt connection; The disc friction plate (63) is composed of five static friction plates (631) and four dynamic friction plates (632), and the five static friction plates (631) and the four dynamic friction plates (632) are alternately stacked in sequence; The wet brake assembly (6) is provided with a brake oil inlet (67) and a brake pump (68), and the brake oil inlet (67) is connected to the brake pump (68) through an oil pipe; A piston sealing ring (611) is arranged outside the brake piston (61), and the piston sealing ring (611) is a BY ring. The brake piston (61) controls braking through a brake pump (68), and the brake pump (68) is sealed through the piston sealing ring (611), so that the brake piston (61) can obtain a stable braking pressure and reduce the resistance of the brake piston (61) in the process of resetting when the pressure is released; The dynamic friction plate (632) is connected to the brake flange (64) via a spur gear, and a floating oil seal (65) is provided between the dynamic friction plate (632) and the brake flange (64) to achieve an overall external seal of the wheel hub (5) and the brake flange (64); The forklift wet brake drive axle structure is used when the operator steps on the foot brake, and the forklift hydraulic pump system works to generate a braking power source; the hydraulic oil enters the brake pump (68) through the brake oil inlet (67), and the brake pump (68) works, the hydraulic oil pushes the brake piston (61) to move, the brake piston (61) pushes the clutch plate (62) to move, and the five static friction plates (631) and the four dynamic friction plates (632) are pressed together step by step, so that the static friction plates (631) and the dynamic friction plates (632) are Frictional force is generated between the plates (632), preventing the dynamic friction plate (632) from rotating; the dynamic friction plate (632) transmits the braking resistance torque to the wheel hub (5) through the brake flange (64), forcing the wheel hub (5) to slow down until it stops; when braking ends, the brake pump (68) does not work, and the braking pressure disappears. At this time, the six return springs (66) generate a return spring force and push the clutch plate (62) to return, causing the static friction plate (631) and the dynamic friction plate (632) to separate instantly, and the friction resistance disappears.

2. A forklift wet brake drive axle structure according to claim 1, characterized in that: The main reducer assembly (1) is connected to the forklift internal combustion engine via a transmission shaft, and the forklift internal combustion engine provides input power to the main reducer assembly (1), the half shaft (3), the wheel reducer (4), the wheel hub (5), and the wet brake assembly (6) via the transmission shaft, while achieving a first-stage reduction in speed for the main reducer assembly (1).

3. A forklift wet brake drive axle structure according to claim 1, characterized in that: The heat energy generated by the friction between the static friction plate (631) and the dynamic friction plate (632) is absorbed by the gear oil from the wheel-side reducer (4).

4. A forklift wet brake drive axle structure according to claim 1, characterized in that: Six return springs (66) are arranged in the wet brake assembly (6), and the return springs (66) are connected to act on the clutch plate (62).

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