Electric drive skid steer loader specific brake integrated final drive

Abstract

The application discloses a brake integrated speed reducer special for an electrically driven skid-steer loader, which comprises a brake part and a gear speed reduction mechanism, the gear speed reduction mechanism comprises an input shaft, a speed reduction gear train, an output shaft, a chain wheel and related accessories, the input shaft is connected with a motor through a spline, the speed reduction gear train comprises a fixed shaft gear pair part and a planetary speed reduction part, and the fixed shaft gear pair part comprises a primary driving gear and a primary driven gear; the primary driving gear is driven to rotate by the motor driving the speed reducer input shaft to rotate, speed reduction and torque increase are realized through the gear speed reduction mechanism, the torque is transmitted to the chain wheel through the output shaft, and single torque is distributed and transmitted to two wheels through chain transmission, so that the energy loss in the intermediate process is effectively reduced, the transmission system is more energy-saving and reliable, the speed reducer integrates the brake mechanism, the driving and parking brake functions can be realized, and the whole transmission system is more compact.

Description

Brake-integrated reducer for electric skid steer loaders Technical Field

[0001] This invention belongs to the field of engineering machinery transmission technology, specifically relating to a brake-integrated reducer for electric drive skid steer loaders. Background Technology

[0002] Skid steer loaders, as a type of small construction machinery product used internationally, are widely used in Europe and America due to their 360-degree steering and multi-functional features. Currently, most skid steer loaders are driven by an engine + travel pump or motor, which results in high noise, energy consumption, low efficiency, and some pollution to the environment during operation. With the advent of the new energy era, electric drive has become the trend. Therefore, this invention proposes a brake integrated reducer specifically for electric drive skid steer loaders. Summary of the Invention

[0003] The purpose of this invention is to provide a brake-integrated reducer specifically for electric skid steer loaders, in order to solve the problems mentioned in the background art, which currently skid steer loaders mostly use an engine + travel pump or motor drive, which has high noise, high energy consumption, low efficiency and certain pollution to the environment during operation.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a brake-integrated reducer specifically for electric skid steer loaders, comprising a brake section and a gear reduction mechanism. The gear reduction mechanism includes an input shaft, a reduction gear train, an output shaft, a sprocket, and related accessories. The input shaft is connected to a motor via a spline. The reduction gear train includes a fixed-axis gear pair and a planetary reduction section. The fixed-axis gear pair includes a first-stage driving gear and a first-stage driven gear. The planetary reduction section includes a central cycloidal gear, planetary gears, a planet carrier, a gear ring, and a fixed seat. The related accessories include bearings, a fixed seat, and a locking device. The first-stage driving gear is fixed to the end of the input shaft and meshes with the first-stage driven gear. The first-stage driven gear is fixed to the central cycloidal gear. One end of the output shaft extends through to the inside of the fixed seat and is fitted with a planet carrier. The planetary carrier is located inside the gear ring, and multiple planetary gears are located inside the gear ring and mesh with the end of the central cycloidal gear. The sprocket is fixed to the other end of the output shaft. The output shaft outputs torque through a gear reduction mechanism. The sprocket transmits the torque provided by the motor to the wheel through chain drive. The brake part includes a brake friction disc, a brake metal disc, a spring, a brake pusher, a brake piston, a brake support, a brake lever, a brake elastic device, a brake housing, and a sealing device. The brake friction disc, brake metal disc, spring, brake pusher, brake piston, brake support, brake elastic device, and sealing device are all located inside the brake housing. The brake metal disc is mounted on one side of the brake support. The brake friction disc is located on one side of the brake metal disc. The brake pusher is located on one side of the brake friction disc. The brake elastic device is located on one side of the brake pusher. The brake piston is located on one side of the brake elastic device. The brake lever is rotatably disposed at one end of the brake housing, and one end of the brake lever contacts the end of the brake piston. One end of the central cycloidal gear passes through to the inside of the brake housing and connects to the brake metal disc.

[0005] Preferably, the bearing is disposed between the fixed seat and the output shaft, and the planetary carrier is fixed to the end of the output shaft by a locking device, which is a locking bolt.

[0006] Preferably, a sealing device and a piston seal are respectively installed on the two end surfaces of the brake piston, a spring is provided between the brake pusher and the brake friction disc, and a sealing gasket is provided on the inner side of the brake housing.

[0007] Preferably, one end of the brake housing is fixed to a base shaft, and the brake lever is rotatably sleeved on the base shaft.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention drives the input shaft of the reducer to rotate via a motor, thereby driving the first-stage drive gear to rotate. The gear reduction mechanism achieves speed reduction and torque increase. The torque is transmitted to the sprocket via the output shaft, and then the single torque is distributed to the two wheels via chain drive, effectively reducing energy loss in the intermediate process and making the transmission system more energy-efficient and reliable. At the same time, the reducer integrates a brake mechanism, which can realize driving and parking brake functions, making the entire transmission system more compact. The integrated structure consists of two independent parts, making maintenance more convenient. Attached Figure Description

[0009] Figure 1 is a schematic diagram of the transmission principle of the present invention;

[0010] Figure 2 is a schematic diagram of the brake part of the present invention;

[0011] Figure 3 is a schematic diagram of the gear reduction mechanism of the present invention;

[0012] In the diagram: 1. Brake assembly; 2. Fixed-axis gear pair; 3. Planetary reduction gear; 4. Output shaft; 5. Sprocket; 6. Input shaft; 7. Sealing gasket; 8. Brake actuator; 9. Brake elastic device; 10. Brake piston; 11. Sealing device; 12. Brake lever; 13. Brake friction disc; 14. Brake metal disc; 15. Spring; 16. Brake support; 17. Piston seal; 18. Brake housing; 19. First-stage driving gear; 20. Central cycloidal gear; 21. First-stage driven gear; 22. Planetary gears; 23. Planet carrier; 24. Gear ring; 25. Fixed seat; 26. Bearing. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Example

[0015] Please refer to Figures 1 to 3. This invention provides a technical solution: a brake-integrated reducer specifically for electric skid steer loaders, comprising a brake part 1 and a gear reduction mechanism, which are independent of each other. The gear reduction mechanism includes an input shaft 6, a reduction gear train, an output shaft 4, a sprocket 5, and related accessories. The input shaft 6 is connected to the motor via a spline to provide power. The reduction gear train includes a fixed-axis gear pair part 2 and a planetary reduction part 3. The fixed-axis gear pair part 2 includes a first-stage driving gear 19 and a first-stage driven gear 21. The planetary reduction part 3 includes a central cycloidal gear 20, planetary gears 22, a planet carrier 23, a gear ring 24, and a fixed seat 25. Related accessories include a bearing 26, a fixed seat 25, and a locking device. The first-stage driving gear 19 is fixed to the end of the input shaft 6 and meshes with the first-stage driven gear 21. The first-stage driven gear 21 is fixed on the central cycloidal gear 20. One end of the output shaft 4 extends through to the inside of the fixed seat 25 and is fitted with the planet carrier 23, which is located inside the gear ring 24. Multiple planetary gears 22 are located inside the gear ring 24 and mesh with the end of the central cycloidal gear 20. A sprocket 5 is fixed to the other end of the output shaft 4. The output shaft 4 outputs torque through a gear reduction mechanism. The sprocket 5 transmits the torque provided by the motor to the wheels via chain drive. During operation, the motor drives the input shaft 6 through a first-stage reduction via a fixed-axis gear pair 2, and then through a second-stage reduction via a planetary reduction section 3, transmitting the torque to the output shaft 4, which in turn transmits it to the sprocket 5, thus achieving power transmission. The brake part 1 includes a brake friction disc 13, a brake metal disc 14, a spring 15, a brake actuator 8, a brake piston 10, a brake support 16, a brake lever 12, a brake elastic device 9, a brake housing 18, and a sealing device 11. The components include the brake friction disc 13, brake metal disc 14, spring 15, brake actuator 8, brake piston 10, and brake support 16. Both the brake elastic device 9 and the sealing device 11 are located inside the brake housing 18. The brake metal disc 14 is mounted on one side of the brake support 16. The brake friction disc 13 is located on one side of the brake metal disc 14. The brake pusher 8 is located on one side of the brake friction disc 13. The brake elastic device 9 is located on one side of the brake pusher 8. The brake piston 10 is located on one side of the brake elastic device 9. The brake lever 12 is rotatably mounted at one end of the brake housing 18, and one end of the brake lever 12 contacts the end of the brake piston 10. One end of the central cycloidal gear 20 passes through to the inside of the brake housing 18 and connects to the brake metal disc 14. The brake part 1 controls the brake piston 10 to push the oil in the brake chamber through the brake signal, and transmits the signal to the brake pusher 8 to press the brake friction disc 13, thereby generating braking force.

[0016] In this embodiment, preferably, the bearing 26 is disposed between the fixed seat 25 and the output shaft 4, and the planetary carrier 23 is fixed to the end of the output shaft 4 by a locking device, which is a locking bolt.

[0017] In this embodiment, preferably, sealing devices 11 and piston seals 17 are respectively installed on the two end surfaces of the brake piston 10, a spring 15 is provided between the brake pusher 8 and the brake friction disc 13, and a sealing gasket 7 is provided on the inner side of the brake housing 18. The sealing gasket 7 is used to seal the joint surface between the brake housing 18 and the inner connecting part.

[0018] In this embodiment, preferably, one end of the brake housing 18 is fixed with a base shaft, and the brake lever 12 is rotatably sleeved on the base shaft.

[0019] The working principle and usage process of this invention: The basic working principle of this integrated brake reducer is that the motor is connected to the input shaft 6 via a spline to input torque, and then the torque is amplified by the gear reduction mechanism and transmitted to the sprocket 5. The torque is then transmitted to the wheel through the sprocket 5. When braking is required, the signal of the brake lever 12 is applied to the brake piston 10. The brake piston 10 pushes the oil in the chamber and transmits the signal to the brake pusher 8, which presses the brake friction disc 13 to generate braking force.

[0020] The present invention has at least the following improvements: 1. Adjustable reduction ratio; 2. Integrated design of reducer and braking system; 3. Independent gear reduction and braking system for easy maintenance; 4. Output power is transmitted to the wheels through sprocket 5; 5. Has driving and parking brake functions; 6. Wet disc brake; 7. Spring brake hydraulic release parking brake.

[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brake-integrated reducer specifically for electric skid steer loaders, characterized in that: The device includes a brake section (1) and a gear reduction mechanism. The gear reduction mechanism includes an input shaft (6), a reduction gear system, an output shaft (4), a sprocket (5), and related accessories. The input shaft (6) is connected to the motor via a spline. The reduction gear system includes a fixed-axis gear pair section (2) and a planetary reduction section (3). The fixed-axis gear pair section (2) includes a first-stage driving gear (19) and a first-stage driven gear (21). The planetary reduction section (3) includes a central cycloidal gear (20), planetary gears (22), a planet carrier (23), a gear ring (24), and a fixed seat (25). The related accessories include a bearing (26), a fixed seat (25), and a locking device. The first-stage driving gear (19) is fixed to the input shaft (6). At the end, the first-stage driving gear (19) meshes with the first-stage driven gear (21), the first-stage driven gear (21) is fixed on the central cycloidal gear (20), one end of the output shaft (4) passes through the inner side of the fixed seat (25) and is equipped with a planet carrier (23), and the planet carrier (23) is located inside the gear ring (24), a plurality of planet gears (22) are located inside the gear ring (24) and mesh with the end of the central cycloidal gear (20), the sprocket (5) is fixed at the other end of the output shaft (4), the output shaft (4) outputs torque through the gear reduction mechanism, the sprocket (5) transmits the torque provided by the motor to the wheel through the chain drive, the brake part (1) includes a brake friction disc (13) and a brake metal disc (14). The components include a spring (15), a brake actuator (8), a brake piston (10), a brake support (16), a brake lever (12), a brake elastic device (9), a brake housing (18), and a sealing device (11). The brake friction disc (13), brake metal disc (14), spring (15), brake actuator (8), brake piston (10), brake support (16), brake elastic device (9), and sealing device (11) are all located inside the brake housing (18). The brake metal disc (14) is mounted on one side of the brake support (16), the brake friction disc (13) is located on one side of the brake metal disc (14), the brake actuator (8) is located on one side of the brake friction disc (13), and the brake elastic device (9) is located on one side of the brake friction disc (13). The device (9) is located on one side of the brake pusher (8), the brake piston (10) is located on one side of the brake elastic device (9), the brake lever (12) is rotatably disposed at one end of the brake housing (18), and one end of the brake lever (12) is in contact with the end of the brake piston (10). One end of the central cycloidal gear (20) passes through the inner side of the brake housing (18) and is connected to the brake metal disc (14). The bearing (26) is disposed between the fixed seat (25) and the output shaft (4). The planetary carrier (23) is fixed to the end of the output shaft (4) by a locking device, which is a locking bolt. The two ends of the brake piston (10) are respectively equipped with a sealing device (11) and a piston seal (17).A spring (15) is provided between the brake actuator (8) and the brake friction disc (13). A sealing gasket (7) is provided on the inner side of the brake housing (18). A base shaft is fixed to one end of the brake housing (18), and the brake lever (12) is rotatably sleeved on the base shaft.

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