Rear drive system of pure electric mining dump truck and pure electric mining dump truck

Abstract

The invention discloses a rear drive system of a pure electric mining dump truck and the pure electric mining dump truck, and solves the problems that a drive system of a traditional mining dump truck is complex in structure, high in transportation cost and prone to polluting the environment. The drive axle specifically comprises a drive axle housing, two drive motors arranged in the drive axle housing and drive assemblies arranged on the left side and the right side of the drive axle housing. Bodies of the two driving motors are fixedly connected with the driving axle housing, and driving shafts of the driving motors extend out of the left side wall and the right side wall of the driving axle housing respectively and are rotatably connected with the corresponding side walls; the driving assembly comprises planet carriers and half shafts arranged in the planet carriers, and further comprises sun gears, planet gears, inner gear rings and hubs. The environment pollution can be reduced, the transportation efficiency can be improved, and the transportation cost can be saved.

Description

Technical Field

[0001] The present invention relates to a mining dump truck, and in particular to a pure electric mining dump truck rear drive system and a pure electric mining dump truck. Background Art

[0002] Mining dump trucks are off-road dump trucks, which are often used in off-road field sites, such as large open-pit mines and water conservancy projects, to transport coal, sand and gravel. In civil engineering, they are often combined with excavators, loaders, belt conveyors and other engineering machinery to form a loading, transporting and unloading production line to load, unload and transport earth, sand and gravel, and bulk materials.

[0003] The Chinese utility model patent with publication number CN219634983U discloses "A power transmission system and a pure electric wide-body dump truck for mining", in which the power transmission system includes a first drive motor, a gearbox, a second drive motor, a first transmission shaft and a first drive axle, the output end of the first drive motor is transmission-connected to the input end of the gearbox, the output end of the gearbox is transmission-connected to the input end of the second drive motor, one end of the first transmission shaft is transmission-connected to the output end of the second drive motor, the other end of the first transmission shaft is transmission-connected to the first half-axle in the first drive axle, and the rated speed of the first drive motor is greater than the rated speed of the second drive motor. The power transmission system retains some traditional power transmission components and can meet the heavy load operation requirements of a fully loaded pure electric wide-body dump truck for mining such as climbing or starting, but the drive system has a complex structure, high transportation cost and is easy to pollute the environment. Summary of the invention

[0004] In order to solve the technical problems of complex driving system structure, high transportation cost and easy environmental pollution of traditional mining dump trucks, the present invention provides a pure electric mining dump truck rear drive system and a pure electric mining dump truck.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A pure electric mining dump truck rear drive system, which is special in that it includes a drive axle housing, two drive motors arranged in the drive axle housing, and drive components arranged on the left and right sides of the drive axle housing;

[0007] The bodies of the two driving motors are fixedly connected to the driving axle housing, and the driving shafts thereof extend from the left and right side walls of the driving axle housing respectively and are rotatably connected to the corresponding side walls;

[0008] The drive assembly includes a planet carrier, a half shaft arranged in each planet carrier, a sun gear, a planet gear, an inner gear ring and a wheel hub;

[0009] The planet carrier is fixedly mounted outside the corresponding side wall of the drive axle housing so that the drive shaft of the corresponding drive motor is located in the corresponding planet carrier;

[0010] One end of the half shaft is connected to the driving shaft of the corresponding driving motor; the axes of the two half shafts located on both sides of the driving axle housing are located on the same straight line;

[0011] The sun gear is fixedly sleeved outside the other end of the half shaft;

[0012] The planetary gears include a plurality of planetary gears, which are evenly distributed around the sun gear and are rotatably connected to the planet carriers and meshed with the sun gears respectively;

[0013] The inner gear ring is sleeved on the outside of the plurality of planetary gears and meshes with each planetary gear;

[0014] The wheel hub is sleeved outside the inner gear ring and the planet carrier, the wheel hub is spline-connected with the inner gear ring, and the wheel hub is rotatably connected with the planet carrier.

[0015] Furthermore, the axes of the two driving motors are located on the same horizontal plane.

[0016] Further, one end of the half shaft is connected to the driving shaft of the corresponding driving motor through the first gear and the second gear;

[0017] The first gear is fixedly sleeved on the driving shaft of the corresponding driving motor;

[0018] The second gear is fixedly sleeved outside one end of the half shaft;

[0019] The first gear and the second gear mesh with each other.

[0020] Furthermore, a brake disc is mounted on the driving shaft of each driving motor;

[0021] The planet carrier is provided with a brake through hole corresponding to the brake disc.

[0022] Further, the planet carrier comprises a conical section and a first cylindrical section which are coaxially connected;

[0023] The large end of the tapered section is fixedly connected to the corresponding side wall of the drive axle housing, so that the first gear, the second gear and the brake disc are located in the tapered section; the brake through hole is located on the side wall of the tapered section;

[0024] The first cylindrical section is fixedly connected to the small end of the conical section, and a plurality of mounting shafts are provided at one end of the first cylindrical section away from the conical section, and the axes of the mounting shafts are parallel to the axis of the first cylindrical section; the plurality of planetary gears are rotatably mounted on the plurality of mounting shafts respectively and correspondingly; the wheel hub is rotatably connected to the outer circle of the first cylindrical section via a connecting bearing;

[0025] The half shaft is arranged inside the conical section and the first cylindrical section.

[0026] Further, the drive assembly also includes a rim;

[0027] The wheel rim is sleeved outside the corresponding wheel hub and is used for externally connecting the tire.

[0028] Further, the planet carrier comprises a second cylindrical section, a conical section and a first cylindrical section which are coaxially connected in sequence;

[0029] One end of the second cylindrical section is fixedly connected to the corresponding side wall of the drive axle housing, and the other end is fixedly connected to the large end of the tapered section, so that the first gear, the second gear and the brake disc are located in the second cylindrical section and the tapered section; the brake through hole is located on the side wall of the tapered section;

[0030] The first cylindrical section is fixedly connected to the small end of the conical section, and a plurality of mounting shafts are provided at one end of the first cylindrical section away from the conical section, and the axes of the mounting shafts are parallel to the axes of the first cylindrical section; the plurality of planetary gears are rotatably mounted on the plurality of mounting shafts respectively; the wheel hub is rotatably connected to the outer circle of the first cylindrical section via a connecting bearing; the wheel hub is rotatably connected to the first cylindrical section via a connecting bearing;

[0031] The semi-shaft is arranged inside the second cylindrical section, the conical section and the first cylindrical section.

[0032] Further, a rim is also included;

[0033] The wheel rim is sleeved outside the wheel hub and is used for externally connecting the tire.

[0034] Furthermore, the drive axle housing is provided with maintenance windows at both the front and rear ends, and a mounting lug is provided on the top thereof for mounting an external rear suspension hydraulic cylinder.

[0035] A pure electric mining dump truck is special in that it comprises the above-mentioned pure electric mining dump truck rear drive system.

[0036] Beneficial effects of the present invention:

[0037] 1. The present invention aims at rear-drive mining vehicles and proposes a pure electric mining dump truck rear-drive system to replace the traditional mechanical transmission mining trucks, which can not only reduce environmental pollution, but also improve transportation efficiency and save transportation costs.

[0038] 2. Compared with the central drive and oil-to-electric solutions, the pure electric drive of the present invention eliminates components such as the drive shaft and differential, shortens the transmission chain, and improves transmission efficiency; it also has a compact structure and simple layout, can improve the utilization of the internal space of the vehicle body, and has stronger power performance.

[0039] 3. Compared with the parallel shaft electric drive axle, the planetary gear arrangement of the present invention is not only compact in structure, but also has stronger load-bearing capacity, which can greatly increase the load of mining trucks; there is no shifting mechanism, which avoids fatigue damage to the shifting mechanism due to long-term shifting, thereby improving the driving safety of the vehicle.

[0040] 4. In the present invention, the two driving motors are arranged horizontally front and back, which can increase the ground clearance of the dump truck.

[0041] 5. The present invention arranges a brake disc on the driving shaft of the driving motor, which can make the driving motor stop running quickly when a fault occurs to avoid accidents. It can also play a protective role during the operation of the driving motor to avoid abnormal situations such as overload.

[0042] 6. The present invention provides maintenance windows on the front and rear sides of the drive axle housing to facilitate motor maintenance and circuit inspection, and the top is provided with mounting ears to facilitate installation of the rear suspension hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is one of the structural schematic diagrams of an embodiment of a rear drive system of a pure electric mining dump truck of the present invention;

[0044] Figure 2 is a schematic diagram of the three-dimensional structure of the drive axle housing in an embodiment of the present invention;

[0045] Figure 3 This is the second structural schematic diagram of an embodiment of a rear drive system of a pure electric mining dump truck of the present invention.

[0046] Figure Number:

[0047] 1-drive axle housing, 2-drive motor, 3-planet carrier, 31-conical section, 32-first cylindrical section, 33-second cylindrical section, 4-semi-axle, 5-sun gear, 6-planet gear, 7-inner ring gear, 8-wheel hub, 9-first gear, 10-second gear, 11-brake disc, 12-rim, 13-lug, 14-maintenance window. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Embodiment 1:

[0050] An embodiment of the present invention provides a pure electric mining dump truck rear drive system, such as Figure 1As shown, it includes a drive axle housing 1, two drive motors 2 arranged in the drive axle housing 1, and drive components arranged on the left and right sides of the drive axle housing 1;

[0051] like Figure 2 As shown, the left and right side walls of the drive axle housing 1 are provided with through holes corresponding to the drive shafts according to the arrangement of the drive motor 2. The aperture can be reduced to a suitable position to increase the thickness of the two side walls and enhance the rigidity and strength of the entire axle housing. The front and rear ends of the drive axle housing 1 are provided with maintenance windows 14 to facilitate motor maintenance and line inspection. Compared with opening the motor maintenance window on the upper part of the axle housing, opening windows on the front and rear surfaces can ensure the rigidity and strength of the axle housing. The top of the drive axle housing 1 is provided with mounting ears 13 for mounting the external rear suspension hydraulic cylinder. The position and structure of the ears can be changed according to the different matching hydraulic cylinders.

[0052] The bodies of the two drive motors 2 are fixedly connected to the drive axle housing 1, and their drive shafts extend from the left and right side walls of the drive axle housing 1 respectively and are rotatably connected to the corresponding side walls; a brake disc 11 is also mounted on the drive shaft of each drive motor 2; the two drive motors 2 are located on the same horizontal plane, the drive shaft of the drive motor 2 located on the front side faces the left side of the drive axle housing 1, and the drive shaft of the drive motor 2 located on the rear side faces the right side of the drive axle housing 1. The front and rear arrangement of the drive motors 2 can be changed according to the different internal vehicle pipelines, such as Figure 3 As shown, in other embodiments, it can also be set as follows: the drive shaft of the drive motor 2 located at the front side faces the right side of the drive axle housing 1, and the drive shaft of the drive motor 2 located at the rear side faces the left side of the drive axle housing 1. The two drive motors 2 are arranged horizontally front and back, which can save the space under the axle housing and improve the ground clearance of the dump truck. The brake disc 11 is rigidly connected to the drive shaft of the drive motor 2. After the brake disc is equipped, the drive shaft of the drive motor 2 stops running after it acts, so that the whole vehicle is braked; it can also play a protective role during the operation of the drive motor 2 to avoid abnormal conditions such as overload.

[0053] The driving assembly includes a planetary carrier 3, a half shaft 4 arranged in each planetary carrier 3, and also includes a sun gear 5, a planetary gear 6, an inner ring gear 7, a hub 8 and a rim 12; the planetary carrier 3 is fixedly installed outside the corresponding side wall of the drive axle housing 1, so that the drive shaft of the corresponding drive motor 2 is located in the corresponding planetary carrier 3; the planetary carrier 3 includes a second cylindrical section 33, a conical section 31 and a first cylindrical section 32 which are coaxially connected in sequence; one end of the second cylindrical section 33 is fixedly connected to the corresponding side wall of the drive axle housing 1, and the other end is fixedly connected to the large end of the conical section 31, so that the first gear 9, the second gear 10 and the brake disc 11 are located in the second cylindrical section 33 and the conical section 31; a brake through hole corresponding to the brake disc 11 is provided on the side wall of the conical section 31. The first cylindrical section 32 is fixedly connected to the small end of the conical section 31. The end of the first cylindrical section 32 away from the conical section 31 is provided with a plurality of mounting shafts, and the axis of the mounting shaft is parallel to the axis of the first cylindrical section 32. The plurality of planetary gears 6 are rotatably mounted on the plurality of mounting shafts respectively. The hub 8 is rotatably connected to the outer circle of the first cylindrical section 32 through a connecting bearing. The hub 8 is rotatably connected to the first cylindrical section 32 through a connecting bearing. The half shaft 4 is arranged in the second cylindrical section 33, the conical section 31 and the first cylindrical section 32. One end of the half shaft 4 is connected to the driving shaft of the corresponding driving motor 2 through the first gear 9 and the second gear 10. The first gear 9 is fixedly mounted on the outside of the driving shaft of the corresponding driving motor 2. The second gear 10 is fixedly mounted on the outside of one end of the half shaft 4. The first gear 9 and the second gear 10 are meshed with each other, and the transmission speed ratio can be changed and designed according to the gear parameters of the actual vehicle requirements. The axes of the two half shafts 4 located on both sides of the drive axle housing 1 are located on the same straight line; the sun gear 5 is fixedly sleeved on the other end of the half shaft 4; the planetary gear 6 includes multiple planetary gears 6, which are evenly distributed around the sun gear 5 and are rotatably connected to the planetary carrier 3 respectively, and are also meshed with the sun gear 5 respectively. At this time, the planetary gear 6 can only rotate on its own and cannot revolve around the sun gear; the inner gear ring 7 is sleeved on the outside of the multiple planetary gears 6 and meshed with each planetary gear 6; the wheel hub 8 is sleeved on the outside of the inner gear ring 7 and the planetary carrier 3, the wheel hub 8 is splined with the inner gear ring 7, and the wheel hub 8 is rotatably connected to the planetary carrier 3. The wheel rim 12 is sleeved on the outside of the wheel hub 8 for external tire.

[0054] The planet carrier 3 and the drive axle housing 1 are both made of high-strength and high-rigidity materials, which can increase the rigidity and strength of the electric drive system and improve the overall operating performance.

[0055] The torque of the driving motor 2 is transmitted to the second gear 10 through the first gear 9, and the second gear 10 is connected to the half shaft 4 and transmitted to the sun gear 5 through the half shaft 4. The planetary gear 6 of the planetary gear system only rotates on its own but does not revolve around the sun gear 5. The torque of the sun gear 5 is transmitted to the inner ring gear 7 through the planetary gear 6 to drive the inner ring gear 7 to rotate. The outer spline of the inner ring gear 7 transmits the torque to the wheel hub 8, which in turn drives the rim 12 and the tire to rotate, transmits the torque to the ground, and drives the vehicle forward.

[0056] Embodiment 2:

[0057] The second embodiment is basically the same as the first embodiment, except that, in the present embodiment, the planet carrier 3 includes a coaxially connected conical section 31 and a first cylindrical section 32; the large end of the conical section 31 is fixedly connected to the corresponding side wall of the drive axle housing 1, so that the first gear 9, the second gear 10 and the brake disc 11 are located in the conical section 31; the brake through hole is located on the side wall of the conical section 31; the first cylindrical section 32 is fixedly connected to the small end of the conical section 31, and a plurality of mounting shafts are provided at one end of the first cylindrical section 32 away from the conical section 31, and the axes of the mounting shafts are parallel to the axis of the first cylindrical section 32; a plurality of planetary gears 6 are respectively and correspondingly rotatably mounted on the plurality of mounting shafts; the hub 8 is rotatably connected to the outer circle of the first cylindrical section 32 through a connecting bearing; the half shaft 4 is passed through the conical section 31 and the first cylindrical section 32.

[0058] An embodiment of the present invention further provides a pure electric mining dump truck, which may include any one of the pure electric mining dump truck rear drive systems of the first and second embodiments.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pure electric mining dump truck rear drive system, characterized by: It comprises a drive axle housing (1), two drive motors (2) arranged in the drive axle housing (1), and drive components arranged on the left and right sides of the drive axle housing (1); The bodies of the two driving motors (2) are fixedly connected to the driving axle housing (1), and the driving shafts thereof extend from the left and right side walls of the driving axle housing (1) respectively and are rotatably connected to the corresponding side walls; The drive assembly comprises a planet carrier (3), a half shaft (4) arranged in each planet carrier (3), a sun gear (5), a planet gear (6), an inner ring gear (7) and a wheel hub (8); The planet carrier (3) is fixedly mounted outside the corresponding side wall of the drive axle housing (1), so that the drive shaft of the corresponding drive motor (2) is located inside the corresponding planet carrier (3); One end of the half shaft (4) is connected to the drive shaft of the corresponding drive motor (2); the axes of the two half shafts (4) located on both sides of the drive axle housing (1) are located on the same straight line; The sun gear (5) is fixedly sleeved on the other end of the half shaft (4); The planetary gears (6) include a plurality of planetary gears (6), which are evenly distributed around the sun gear (5) and are rotatably connected to the planet carrier (3) and mesh with the sun gear (5) respectively; The inner gear ring (7) is sleeved on the outside of the plurality of planetary gears (6) and meshes with each planetary gear (6); The wheel hub (8) is sleeved outside the inner gear ring (7) and the planet carrier (3), the wheel hub (8) is spline-connected to the inner gear ring (7), and the wheel hub (8) is rotatably connected to the planet carrier (3).

2. The rear drive system of a pure electric mining dump truck according to claim 1 is characterized in that: The axes of the two driving motors (2) are located on the same horizontal plane.

3. The rear drive system of a pure electric mining dump truck according to claim 1 or 2, characterized in that: One end of the half shaft (4) is connected to the drive shaft of the corresponding drive motor (2) through a first gear (9) and a second gear (10); The first gear (9) is fixedly sleeved on the outside of the drive shaft of the corresponding drive motor (2); The second gear (10) is fixedly sleeved on one end of the half shaft (4); The first gear (9) and the second gear (10) are meshed with each other.

4. The rear drive system of a pure electric mining dump truck according to claim 3 is characterized in that: A brake disc (11) is also mounted on the drive shaft of each drive motor (2); The planet carrier (3) is provided with a brake through hole corresponding to the brake disc (11).

5. The rear drive system of a pure electric mining dump truck according to claim 4 is characterized in that: The planet carrier (3) comprises a conical section (31) and a first cylindrical section (32) which are coaxially connected; The large end of the tapered section (31) is fixedly connected to the corresponding side wall of the drive axle housing (1), so that the first gear (9), the second gear (10) and the brake disc (11) are located in the tapered section (31); the brake through hole is located on the side wall of the tapered section (31); The first cylindrical section (32) is fixedly connected to the small end of the conical section (31); a plurality of mounting shafts are provided at one end of the first cylindrical section (32) away from the conical section (31); the axes of the mounting shafts are parallel to the axis of the first cylindrical section (32); the plurality of planetary gears (6) are rotatably mounted on the plurality of mounting shafts respectively; the wheel hub (8) is rotatably connected to the outer circle of the first cylindrical section (32) via a connecting bearing; The half shaft (4) is inserted into the conical section (31) and the first cylindrical section (32).

6. The rear drive system of a pure electric mining dump truck according to claim 5 is characterized in that: The drive assembly also includes a rim (12); The wheel rim (12) is sleeved outside the corresponding wheel hub (8) and is used for externally connecting a tire.

7. The rear drive system of a pure electric mining dump truck according to claim 4 is characterized in that: The planet carrier (3) comprises a second cylindrical section (33), a conical section (31) and a first cylindrical section (32) which are coaxially connected in sequence; One end of the second cylindrical section (33) is fixedly connected to the corresponding side wall of the drive axle housing (1), and the other end is fixedly connected to the large end of the tapered section (31), so that the first gear (9), the second gear (10) and the brake disc (11) are located inside the second cylindrical section (33) and the tapered section (31); the brake through hole is located on the side wall of the tapered section (31); The first cylindrical section (32) is fixedly connected to the small end of the conical section (31); a plurality of mounting shafts are provided at one end of the first cylindrical section (32) away from the conical section (31); the axes of the mounting shafts are parallel to the axis of the first cylindrical section (32); the plurality of planetary gears (6) are rotatably mounted on the plurality of mounting shafts respectively; the wheel hub (8) is rotatably connected to the outer circle of the first cylindrical section (32) via a connecting bearing; the wheel hub (8) is rotatably connected to the first cylindrical section (32) via a connecting bearing; The half shaft (4) is arranged inside the second cylindrical section (33), the conical section (31) and the first cylindrical section (32).

8. The rear drive system of a pure electric mining dump truck according to claim 7, characterized in that: Also includes a rim (12); The wheel rim (12) is sleeved outside the wheel hub (8) and is used for externally connecting the tire.

9. The rear drive system of a pure electric mining dump truck according to claim 8, characterized in that: The drive axle housing (1) is provided with maintenance windows (14) at both the front and rear ends, and a mounting lug (13) is provided on the top thereof for mounting an external rear suspension hydraulic cylinder.

10. A pure electric mining dump truck, characterized in that: It comprises the rear drive system of a pure electric mining dump truck as described in any one of claims 1-9.

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