New energy mining dump truck gearbox

Abstract

A new energy mining dump truck gearbox comprises four motors, an input mechanism, a speed change mechanism and an output shaft connected with the speed change mechanism in a meshed mode, and is characterized in that the input mechanism comprises a front input assembly connected with the two motors respectively, a rear input assembly connected with the other two motors respectively, and a normally-meshed shaft; the constant meshing shaft is connected with the input end of the speed change mechanism, the rotating direction of the front input assembly is opposite to that of the rear input assembly, a front bevel gear meshed with the front input assembly and a rear bevel gear meshed with the rear input assembly are coaxially fixed to the constant meshing shaft, and helical teeth of the front bevel gear and helical teeth of the rear bevel gear are arranged in a mirror symmetry mode. The power of the front input assembly and the power of the rear input assembly are converged to the normally engaged shaft. The transmission reliability is improved, the failure rate is reduced, the connectivity of power during gear shifting is guaranteed, the risk of power interruption during lifting and unloading of the mine car is avoided, and the safety of continuous operation under the extreme working condition is improved.

Description

Technical Field

[0001] The present invention relates to a gearbox for a new energy mining dump truck, belonging to the technical field of new energy mining dump trucks. Background Art

[0002] A dump truck refers to a vehicle that can unload goods by hydraulic or mechanical lifting, also known as a tipper truck. The carriage of a dump truck can automatically tilt at a certain angle to unload materials. As the core equipment for mine transportation, due to the pain points of traditional diesel power systems such as high carbon emissions, low energy consumption efficiency, and high operation and maintenance costs, in recent years, pure electric mining dump trucks have become important transportation tools in mines due to their advantages of low operation cost, low maintenance cost, high work efficiency, and zero emissions. The gearbox, as an important component of the electric drive system, can play a role of "reducing speed and increasing torque" during the climbing process of the mining truck, enhancing the climbing ability of the mining truck; at the same time, during the heavy-load downhill process of the mining truck, the driver can adjust the transmission ratio and energy recovery efficiency of the gearbox by shifting gears. However, the extreme heavy load, frequent start-stop, long-slope braking and other complex working conditions of mining dump trucks pose strict requirements on the power transmission system. The existing gearbox technology for civilian electric vehicles is difficult to meet the requirements and has the following defects: 1. Single-motor drive cannot meet the large-torque power output requirements under heavy loads. The power confluence structure of multi-motor drive is complex. When carrying large torques, the axial force borne by the drive shaft is large, and the stress borne by the gears is large, resulting in accelerated wear of the shafting support bearings and gears on the drive shaft, short service life, increased failure rate, and affecting transmission reliability.

[0003] 2. When the mining truck lifts and unloads materials, the shift impact is large, there is a risk of power interruption, the power continuity is poor, and the safety of continuous operation under extreme working conditions cannot be guaranteed. Summary of the Invention

[0004] The gearbox for a new energy mining dump truck provided by the present invention improves the torque density to meet the large-torque bearing requirements of the mining dump truck. The helical teeth of the front helical gear and the rear helical gear are arranged in mirror symmetry, reducing the axial load of the constant-mesh shaft, reducing the force on the shafting support bearings on the constant-mesh shaft, reducing the wear of the shafting support bearings, improving transmission reliability, reducing the failure rate, ensuring the connection of power during shifting, avoiding the risk of power interruption when the mining truck lifts and unloads materials, and reducing the power impact caused by synchronous shifting of the two transmission components, improving the shift smoothness, and improving the safety of continuous operation under extreme working conditions.

[0005] To achieve the above object, the technical solution adopted by the present invention is: New energy mining dump truck gearbox, including four motors, an input mechanism, a speed-changing mechanism and an output shaft meshed and connected with the speed-changing mechanism, characterized in that: the input mechanism includes a front input component respectively connected with two motors, a rear input component respectively connected with the other two motors and a constant-mesh shaft, the constant-mesh shaft is connected with the input end of the speed-changing mechanism, the rotation directions of the front input component and the rear input component are opposite, the front helical gear meshing with the front input component and the rear helical gear meshing with the rear input component are coaxially fixed on the constant-mesh shaft, and the helical teeth of the front helical gear and the rear helical gear are arranged in mirror symmetry, so as to combine the power of the front input component and the rear input component onto the constant-mesh shaft.

[0006] Preferably, the front input component includes motor one, motor two, front input shaft one connected with motor one, and front input shaft two connected with motor two and parallel to front input shaft one. Front input gears are respectively fixed on front input shaft one and front input shaft two, and the front input gears mesh with the front helical gear; the rear input component includes motor three, motor four, rear input shaft one connected with motor three, and rear input shaft two connected with motor four and parallel to rear input shaft one. Rear input gears are respectively fixed on rear input shaft one and rear input shaft two, and the rear input gears mesh with the rear helical gear.

[0007] Preferably, the front input shaft one and the rear input shaft one are coaxially aligned, the front input shaft two and the rear input shaft two are coaxially aligned, the constant-mesh shaft is arranged parallel between the front input shaft one and the front input shaft two, and both the front input gear and the rear input gear are helical gears and the helical teeth are arranged in mirror symmetry.

[0008] Preferably, the speed-changing mechanism includes an intermediate gear shaft coaxially connected with the constant-mesh shaft, a rear intermediate shaft meshing with the intermediate gear shaft, and a two-speed shifting component mounted on the rear intermediate shaft and meshing with the output shaft. The output shaft is coaxially arranged at the rear side of the intermediate gear shaft.

[0009] Preferably, the number of the rear intermediate shafts is two and they are symmetrically arranged on both sides of the intermediate gear shaft. Constant-mesh gears meshing with the intermediate gear shaft are coaxially fixed on the rear intermediate shafts.

[0010] Preferably, the two-speed shifting component includes a shifting gear coaxially fixed on the rear intermediate shaft, a shifting sleeve slidably assembled on the shifting gear, a first-gear driving gear and a second-gear driving gear respectively rotatably mounted on the rear intermediate shaft through hollow shafts. The first-gear driving gear and the second-gear driving gear respectively mesh with the output shaft and are arranged on the left and right sides of the shifting gear. The shifting sleeve moves leftward to combine with the first-gear driving gear and moves rightward to combine with the second-gear driving gear.

[0011] Preferably, a first-gear driven gear meshing with the first-gear driving gear and a second-gear driven gear meshing with the second-gear driving gear are fixed on the output shaft.

[0012] The beneficial effects of the invention are as follows: For the new energy mine dump truck gearbox of the present invention, the front input component is respectively connected to two motors, and the rear input component is respectively connected to two other motors. The front helical gear on the constantly meshing shaft meshes with the front input component, and the rear helical gear meshes with the rear input component. The front and rear helical gears combine the power of the front input shaft component and the rear input component onto the constantly meshing shaft, forming a parallel input of the combined power of four motors, enhancing the torque bearing capacity of the constantly meshing shaft, increasing the torque density, meeting the large torque bearing requirements of the mine dump truck, and realizing the continuous input of power in case of a single motor failure, ensuring the continuous operation ability under extreme working conditions. The helical teeth of the front helical gear and the rear helical gear are arranged in mirror symmetry, so that the meshing force of the front helical gear acting on the constantly meshing shaft and the meshing force of the rear helical gear acting on the constantly meshing shaft are set in opposite directions and cancel each other out. That is, the axial thrust generated by the rotation of the front helical gear on the constantly meshing shaft and the axial thrust generated by the rotation of the rear helical gear are cancelled out in the opposite direction, thereby reducing the axial load of the constantly meshing shaft, reducing the force on the shaft support bearings on the constantly meshing shaft, reducing the wear of the shaft support bearings, enhancing the transmission reliability, and reducing the failure rate.

[0013] Two rear intermediate shafts are used for split flow transmission, effectively reducing the gear contact stress of the constantly meshing gears on the rear intermediate shafts, avoiding the accelerated wear or deformation of the gears due to excessive stress when transmitting large torques, enhancing the torque bearing capacity, and improving the transmission reliability. Two-speed transmission components are respectively assembled on the two rear intermediate shafts. When one group shifts gears, the other group protects the current gear position unchanged, ensuring the connectivity of power during gear shifting, avoiding the risk of power interruption when the mining truck lifts and unloads materials, and reducing the power impact caused by the synchronous gear shifting of the two transmission components, improving the gear shifting smoothness, and enhancing the safety of continuous operation under extreme working conditions. Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the transmission structure of the new energy mine dump truck gearbox.

[0015] Figure 2 It is a schematic diagram of the transmission structure of the new energy mine dump truck gearbox when the low-speed gear power is output.

[0016] Figure 3 It is a schematic diagram of the transmission structure of the new energy mine dump truck gearbox when the high-speed gear power is output.

[0017] Figure 4 It is a combined schematic diagram of the input mechanism, the constantly meshing shaft, the front helical gear and the rear helical gear. Detailed Description of the Specific Embodiment

[0018] The following Figures 1 - 4 makes a detailed description of the embodiments of the present invention.

[0019] New energy mining dump truck gearbox, including four motors, an input mechanism, a speed-changing mechanism 1 and an output shaft 2 meshed and connected with the speed-changing mechanism 1, is characterized in that: the input mechanism includes a front input component 3 respectively connected with two motors, a rear input component 4 respectively connected with the other two motors and a constant-mesh shaft 5. The constant-mesh shaft 5 is connected with the input end of the speed-changing mechanism 1. The rotation directions of the front input component 3 and the rear input component 4 are opposite. A front helical gear 6 meshing with the front input component 3 and a rear helical gear 7 meshing with the rear input component 4 are coaxially fixed on the constant-mesh shaft 5. The helical teeth of the front helical gear 6 and the rear helical gear 7 are arranged in mirror symmetry, and the power of the front input component 3 and the rear input component 4 is combined onto the constant-mesh shaft 5.

[0020] For the above-mentioned new energy mining dump truck gearbox, the front input component 3 is respectively connected with two motors, the rear input component 4 is respectively connected with the other two motors. The front helical gear 6 on the constant-mesh shaft 5 meshes with the front input component 3, and the rear helical gear 7 meshes with the rear input component 4. The front and rear helical gears combine the power of the front input shaft part 3 and the rear input component 4 onto the constant-mesh shaft 5, forming a parallel input of the combined power of four motors, improving the torque-bearing capacity of the constant-mesh shaft 5, increasing the torque density, meeting the large torque-bearing requirements of the mining dump truck, and realizing the continuous input of power in case of a single motor failure, ensuring the continuous operation ability under extreme working conditions; the helical teeth of the front helical gear 6 and the rear helical gear 7 are arranged in mirror symmetry. It can be seen from Figure 4 that the helical teeth of the front helical gear 6 and the rear helical gear 7 are arranged in a symmetric shape similar to an inverted "V", so that the meshing force of the front helical gear acting on the constant-mesh shaft is set in the opposite direction to the meshing force of the rear helical gear acting on the constant-mesh shaft and they cancel each other out. That is, the axial thrust generated by the rotation of the front helical gear 6 on the constant-mesh shaft cancels out the axial thrust generated by the rotation of the rear helical gear 7 in the opposite direction, thereby reducing the axial load of the constant-mesh shaft 5, reducing the force on the shafting support bearings on the constant-mesh shaft 5, reducing the wear of the shafting support bearings, improving the transmission reliability and reducing the failure rate.

[0021] Among them, the front input component 3 includes a first motor 8, a second motor 9, a front input shaft 10 connected to the first motor 8, and a front input shaft 11 connected to the second motor 9 and parallel to the front input shaft 10. Front input gears 12 are respectively fixed on the front input shaft 10 and the front input shaft 11, and the front input gears 12 are engaged with the front helical gears 6; the rear input component includes a third motor 13, a fourth motor 14, a rear input shaft 15 connected to the third motor 13, and a rear input shaft 16 connected to the fourth motor 14 and parallel to the rear input shaft 15. Rear input gears 17 are respectively fixed on the rear input shaft 15 and the rear input shaft 16, and the rear input gears 17 are engaged with the rear helical gears 7. The front input shaft 10 is connected to the first motor 8, the front input shaft 11 is connected to the second motor 9, and the front input gears 12 on the front input shaft 10 and the front input shaft 11 are respectively engaged with the front helical gears 6, transmitting the power of the first motor and the second motor to the constant mesh shaft 5. The rear input gears 17 on the rear input shaft 15 and the rear input shaft 16 are respectively engaged with the rear helical gears 7, transmitting the power of the third motor and the fourth motor to the constant mesh shaft 5, forming the confluence and parallel operation of the power of the four motors.

[0022] Among them, the front input shaft 10 is coaxially aligned with the rear input shaft 15, the front input shaft 11 is coaxially aligned with the rear input shaft 16, the constant mesh shaft 5 is arranged in parallel between the front input shaft 10 and the front input shaft 11, and both the front input gears 12 and the rear input gears 17 are helical gears and the helical teeth are arranged in mirror symmetry. The power output directions of the first motor 8 and the third motor 13 are opposite, and the front input shaft 10 and the front input gear 12 thereon and the rear input shaft 15 and the rear input gear 17 thereon form a pair of input gear groups with opposite helix directions. The power input directions of the second motor 9 and the fourth motor 14 are opposite, and the front input shaft 11 and the front input gear 12 thereon and the rear input shaft 16 and the rear input gear 17 thereon form another pair of input gear groups with opposite helix directions. Since the helical teeth of the front helical gear 6 and the rear helical gear 7 are arranged in mirror symmetry, the front input gear 12 engaged with the front helical gear 6 and the rear input gear 17 engaged with the rear helical gear 7 are also arranged in mirror symmetry to adapt to the tooth directions of the front helical gear 6 and the rear helical gear 7, thus forming the power combination of two pairs of input gear groups with opposite rotation directions on the constant mesh shaft.

[0023] Among them, the speed change mechanism 1 includes an intermediate tooth shaft 18 coaxially connected to the constant mesh shaft 5, a rear intermediate shaft 19 engaged with the intermediate tooth shaft 18, and a two-speed change component 20 mounted on the rear intermediate shaft 19 and engaged with the output shaft 2. The output shaft 2 is coaxially arranged at the rear side of the intermediate tooth shaft 18. The power of the four motors is confluent to the constant mesh shaft 5 through the front input component 3 and the rear input component 4. The constant mesh shaft 5 drives the intermediate tooth shaft 18 to rotate synchronously. The intermediate tooth shaft 18 transmits the power to the two-speed change component 20, and the power is transmitted to the output shaft 2 through the two-speed change component 20, forming the output of the power.

[0024] Among them, the number of the rear intermediate shafts 19 is two, and they are symmetrically arranged on both sides of the intermediate gear shaft 18. A constant-mesh gear 21 that meshes with the intermediate gear shaft 18 is coaxially fixed on the rear intermediate shaft 19. The constant-mesh shaft 5 and the intermediate gear shaft 18 transmit the power of the four motors in a combined and parallel manner, and are split and transmitted by two rear intermediate shafts 19, effectively reducing the gear contact stress of the constant-mesh gear 21 on the rear intermediate shaft 19, avoiding the accelerated wear or deformation of the gear due to excessive stress when transmitting large torque, improving the torque bearing capacity, and enhancing the transmission reliability.

[0025] Among them, the two-speed shifting assembly 20 includes a shifting gear 22 coaxially fixed on the rear intermediate shaft 19, a shifting sleeve 23 slidably assembled on the shifting gear 22, a first-gear driving gear 24 and a second-gear driving gear 25 rotatably mounted on the rear intermediate shaft 19 through hollow shafts respectively. The first-gear driving gear 24 and the second-gear driving gear 25 are respectively meshed with the output shaft 2 and are arranged on the left and right sides of the shifting gear 22. The shifting sleeve 23 moves to the left to engage with the first-gear driving gear 24 and moves to the right to engage with the second-gear driving gear 25. Two-speed shifting assemblies 20 are respectively assembled on the two rear intermediate shafts 19. Therefore, there are two sets of two-speed shifting assemblies 20. When one set is shifting gears, the other set keeps the current gear unchanged, ensuring the connectivity of power during gear shifting, avoiding the risk of power interruption when the mining cart lifts and unloads materials, reducing the power impact caused by synchronous gear shifting of the two shifting assemblies, improving the gear shifting smoothness, and enhancing the safety of continuous operation under extreme working conditions. When the shifting sleeves 23 in the two sets of two-speed shifting assemblies 20 are respectively engaged with the first-gear driving gears 24, a low-speed gear power output is formed. At this time, the output torque is the largest, suitable for large-load scenarios such as the mining cart climbing a slope fully loaded and starting under heavy load. When the shifting sleeves 23 in the two sets of two-speed shifting assemblies 20 are respectively engaged with the second-gear driving gears 25, a high-speed gear power output is formed. At this time, the gearbox operates in an efficient range, suitable for low-load scenarios such as the mining cart returning empty or running at high speed on a flat road.

[0026] Among them, a first-gear driven gear 26 meshing with the first-gear driving gear 24 and a second-gear driven gear 27 meshing with the second-gear driving gear 25 are fixed on the output shaft 2. When the shifting sleeve 23 is engaged with the first-gear driving gear 24, the power of the intermediate gear shaft 18 is transmitted to the output shaft 2 through the constant-mesh gear 21, the shifting gear 22, the shifting sleeve 23, the first-gear driving gear 24, and the first-gear driven gear 26, forming a low-speed gear power output. When the shifting sleeve 23 is engaged with the second-gear driving gear 25, the power of the intermediate gear shaft 18 is transmitted to the output shaft 2 through the constant-mesh gear 21, the shifting gear 22, the shifting sleeve 23, the second-gear driving gear 25, and the second-gear driven gear 24, forming a high-speed gear power output.

[0027] The technical solutions of the embodiments of the present invention have been completely described in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

Claims

1. A new energy mining dump truck gearbox, comprising four motors, an input mechanism, a speed change mechanism and an output shaft meshingly connected with the speed change mechanism, characterized in that: The input mechanism includes a front input assembly connected to two motors respectively, a rear input assembly connected to another two motors respectively, and a constant meshing shaft. The constant meshing shaft is connected to the input end of the speed change mechanism. The rotation directions of the front input assembly and the rear input assembly are opposite. A front helical gear meshing with the front input assembly and a rear helical gear meshing with the rear input assembly are coaxially fixed on the constant meshing shaft. The helical teeth of the front helical gear and the rear helical gear are arranged in mirror symmetry, so that the power of the front input assembly and the rear input assembly are merged onto the constant meshing shaft.

2. The new energy mining dump truck gearbox according to claim 1 is characterized in that: The front input assembly includes motor 1, motor 2, front input shaft 1 connected to motor 1, front input shaft 2 connected to motor 2 and parallel to the front input shaft 1, front input gears are respectively fixed on the front input shaft 1 and the front input shaft 2, and the front input gears are meshed with the front bevel gears; the rear input assembly includes motor 3, motor 4, rear input shaft 1 connected to motor 3, rear input shaft 2 connected to motor 4 and parallel to the rear input shaft 1, rear input gears are respectively fixed on the rear input shaft 1 and the rear input shaft 2, and the rear input gears are meshed with the rear bevel gears.

3. The new energy mining dump truck gearbox according to claim 2 is characterized in that: The front input shaft 1 is coaxially aligned with the rear input shaft, the front input shaft 2 is coaxially aligned with the rear input shaft 2, the constant meshing axis is arranged in parallel between the front input shaft 1 and the front input shaft 2, the front input gear and the rear input gear are helical gears and the helical teeth are arranged in mirror symmetry.

4. The new energy mining dump truck gearbox according to claim 1 is characterized in that: The speed change mechanism comprises an intermediate gear shaft coaxially connected with the constant meshing shaft, a rear intermediate shaft meshing with the intermediate gear shaft, and a two-speed change assembly mounted on the rear intermediate shaft and meshing with the output shaft, wherein the output shaft is coaxially arranged at the rear side of the intermediate gear shaft.

5. The new energy mining dump truck gearbox according to claim 1 is characterized in that: There are two rear intermediate shafts which are symmetrically arranged on both sides of the intermediate gear shaft. A constant meshing gear meshing with the intermediate gear shaft is coaxially fixed on the rear intermediate shaft.

6. The new energy mining dump truck gearbox according to claim 5 is characterized in that: The two-speed transmission assembly comprises a shift gear fixedly coaxially fixed on the rear intermediate shaft, a shift gear sleeve slidably mounted on the shift gear, and a first-speed driving gear and a second-speed driving gear rotatably mounted on the rear intermediate shaft through an idler shaft, respectively. The first-speed driving gear and the second-speed driving gear are respectively meshed with the output shaft and are arranged on the left and right sides of the shift gear. The shift gear sleeve moves to the left and combines with the first-speed driving gear, and moves to the right and combines with the second-speed driving gear.

7. The new energy mining dump truck gearbox according to claim 6 is characterized in that: The output shaft is fixed with a first-gear driven gear meshing with the first-gear driving gear and a second-gear driven gear meshing with the second-gear driving gear.

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