Power transmission system and coal car

Abstract

The invention relates to the technical field of power transmission systems, in particular to a power transmission system and a coal conveyor, the power transmission system comprises a parallel shaft speed reducer, an input shaft of the parallel shaft speed reducer is connected with a driving motor; the hub reduction gear is connected with an output shaft of the parallel shaft reduction gear; and the wet brake is arranged on an output shaft of the parallel shaft speed reducer. Through the two-stage speed reduction design of the parallel shaft speed reducer and the hub reduction gear, efficient and stable power transmission can be achieved, and the application requirements of high load and low rotating speed are met; the wet brake is arranged in the parallel shaft speed reducer, space is saved, the safety requirement is met, and the requirements for overall arrangement, weight and cost of an underground coal car are met.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission systems, and in particular to a power transmission system and a coal transport vehicle. Background Art

[0002] Coal trucks are vehicles specially used to transport coal. They are widely used in places such as coal mines where large amounts of coal need to be transported. The power transmission system is one of the core components of coal trucks. It is responsible for transmitting the power of the drive motor to the wheels to drive the vehicle. Underground coal mines have high safety requirements. When designing the power transmission system, wet brakes are required to avoid sparks caused by brake friction.

[0003] However, the existing power transmission system uses an external wet brake and is connected in series with the drive shaft of the drive motor. The overall weight and size are large and cannot meet the overall layout, weight and cost requirements of underground coal trucks. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the prior art or related art that the existing power transmission system adopts an external wet brake and is connected in series with the drive shaft of the drive motor, has a large overall weight and size, and cannot meet the overall layout, weight and cost requirements of the underground coal truck.

[0005] To this end, the present application provides a power transmission system, which can achieve efficient and stable power transmission through a two-stage reduction design of a parallel shaft reducer and a wheel-side reducer, and meet the application requirements of high load and low speed; the wet brake is built into the parallel shaft reducer to save space, which not only meets the safety requirements, but also meets the overall layout, weight and cost requirements of underground coal trucks.

[0006] The present application also provides a coal transport vehicle including the above-mentioned power transmission system.

[0007] A power transmission system according to an embodiment of the first aspect of the present application includes: a parallel shaft reducer, the input shaft of the parallel shaft reducer is connected to the drive motor; a wheel-side reducer, connected to the output shaft of the parallel shaft reducer; and a wet brake, arranged on the output shaft of the parallel shaft reducer.

[0008] Optionally, the parallel shaft reducer includes: a first gear shaft, connected to the driving motor; a second gear shaft, the second gear shaft includes: a primary reduction tooth and a driven tooth, the primary reduction tooth and the driven tooth are coaxially arranged; a third gear shaft, the third gear shaft includes: a secondary reduction tooth and a connecting tooth, the secondary reduction tooth and the connecting tooth are coaxially arranged; the primary reduction tooth is meshed with the first gear shaft, and the driven tooth is meshed with the secondary reduction tooth; a wet brake is arranged on the third gear shaft; and the wheel-side reducer is connected to the connecting tooth.

[0009] Optionally, the parallel shaft reducer further includes: a fourth gear shaft, the fourth gear shaft is meshed with the first-stage reduction gear, and the fourth gear shaft is used to drive the hydraulic pump.

[0010] Optionally, the fourth gear shaft includes: a power take-off gear, a one-way clutch is provided inside the power take-off gear; the one-way clutch is connected to the power take-off gear through a torsion limit plate, and the one-way clutch is used to make the output shaft rotate in one direction.

[0011] Optionally, the axis of the fourth gear shaft is in the same straight line as the axis of the third gear shaft.

[0012] Optionally, the parallel shaft reducer further includes: a fifth gear shaft, the fifth gear shaft is meshed with the secondary reduction gear, and the fifth gear shaft is used to drive the cooling lubrication pump.

[0013] Optionally, a connecting bracket is provided between the parallel shaft reducer and the wheel side reducer, and a heat sink is provided on the connecting bracket; the heat sink is connected to the cooling lubrication pump through a pipeline.

[0014] Optionally, a pressure sensor is provided on the pipeline between the heat sink and the cooling lubrication pump.

[0015] Optionally, the wheel-side reducer includes: a wheel-side housing, in which a planetary gear set is arranged; the planetary gear set is connected to the output shaft of the parallel shaft reducer.

[0016] A coal truck according to an embodiment of the second aspect of the present application includes the power transmission system of the first aspect or its various implementations.

[0017] One of the above technical solutions has at least the following advantages or beneficial effects: A power transmission system of an embodiment of the present application includes: a parallel shaft reducer, the input shaft of the parallel shaft reducer is connected to the drive motor; a wheel-side reducer is connected to the output shaft of the parallel shaft reducer; and a wet brake is arranged on the output shaft of the parallel shaft reducer. Through the two-stage reduction design of the parallel shaft reducer and the wheel-side reducer, efficient and stable power transmission can be achieved to meet the application requirements of high load and low speed; the wet brake is built into the parallel shaft reducer to save space, which not only meets the safety requirements, but also meets the overall layout, weight and cost requirements of the underground coal truck.

[0018] The coal truck provided in the embodiment of the present application is provided with the above-mentioned power transmission system. Since the power transmission system has the above-mentioned technical effects, the coal truck provided with the power transmission system should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic structural diagram of a power transmission system provided by the present application is shown; Figure 2 An exploded view of a power transmission system provided by the present application is shown; Figure 3 One of the structural schematic diagrams of a parallel shaft reducer in a power transmission system provided by the present application is shown; Figure 4 The second structural schematic diagram of a parallel shaft reducer in a power transmission system provided by the present application is shown; Figure 5 The third structural schematic diagram of a parallel shaft reducer in a power transmission system provided by the present application is shown.

[0021] Description of reference numerals: 1. Parallel shaft reducer, 11. First gear shaft, 12. Second gear shaft, 121. Primary reduction gear, 122. Driven gear, 13. Third gear shaft, 131. Reduction gear, 132. Connecting gear, 14. Fourth gear shaft, 141. Power take-off gear, 142. One-way clutch, 143. Torsion limit plate, 15. Fifth gear shaft, 16. Parallel shaft housing, 2. Wet brake, 3. Wheel-side reducer, 31. Wheel-side housing, 32. Planetary gear set, 4. Drive motor, 5. Hydraulic pump, 6. Cooling lubrication pump, 61. Pressure sensor, 7. Connecting bracket, 71. Heat sink. DETAILED DESCRIPTION

[0022] In order to better explain the present application and facilitate understanding, the present application is described in detail below in conjunction with the accompanying drawings through specific implementation methods. The directional terms such as "front", "back", "inside" and "outside" mentioned herein are used in conjunction with the accompanying drawings. Figure 2 and Figure 4 The orientation of is used as a reference. The position of the wheel-side reducer 3 relative to the drive motor 4 is defined as "front"; the position of the planetary gear set 32 ​​relative to the wheel-side housing 31 is defined as "inside".

[0023] As mentioned above, in underground coal mine environments, the design of the powertrain of coal trucks needs to pay special attention to safety and reliability. Due to the presence of flammable and explosive gases, such as methane, underground in coal mines, the design of the powertrain must avoid sparks to prevent explosions, so wet brakes are required to avoid sparks from brake friction. Wet brakes are a braking system that immerses the brake components in oil, which does not generate sparks during braking, and has good heat dissipation performance and stable braking effect.

[0024] However, the existing power transmission system uses an external wet brake and is connected in series with the drive shaft of the drive motor. The overall weight and size are large and cannot meet the overall layout, weight and cost requirements of underground coal trucks.

[0025] In order to solve at least one of the technical problems existing in the prior art or related art, the present application provides a power transmission system and a coal truck, the power transmission system comprising: a parallel shaft reducer, the input shaft of the parallel shaft reducer is connected to the drive motor; a wheel-side reducer, connected to the output shaft of the parallel shaft reducer; a wet brake, arranged on the output shaft of the parallel shaft reducer. Through the two-stage reduction design of the parallel shaft reducer and the wheel-side reducer, efficient and stable power transmission can be achieved to meet the application requirements of high load and low speed; the wet brake is built into the parallel shaft reducer to save space, which not only meets the safety requirements, but also meets the overall layout, weight and cost requirements of the underground coal truck.

[0026] The power transmission system and coal truck according to some embodiments provided by the present application are described below with reference to the accompanying drawings.

[0027] See also Figures 1 to 5 The present application provides a power transmission system, comprising: a parallel shaft reducer 1, the input shaft of the parallel shaft reducer 1 is connected to a drive motor 4; a wheel-side reducer 3, connected to the output shaft of the parallel shaft reducer 1; and a wet brake 2, arranged on the output shaft of the parallel shaft reducer 1.

[0028] The parallel shaft reducer 1 and the wheel-side reducer 3 are used in combination to achieve two-stage reduction control. The drive motor 4 is used to provide power, and the power is transmitted to the output shaft of the parallel shaft reducer 1 through the input shaft of the parallel shaft reducer 1. The gear shafts in the parallel shaft reducer 1 are arranged in parallel, and the first stage reduction is achieved through gear meshing. The reduction ratio can reach 3:1 to 10:1. The output shaft of the parallel shaft reducer 1 is connected to the wheel-side reducer 3 to transmit the power to the wheel-side reducer 3. The wheel-side reducer 3 is installed near the wheel or the driving wheel, and a planetary gear structure can be used to achieve the second stage reduction. The reduction ratio can reach 5:1 to 20:1. The input shaft of the wheel-side reducer 3 is connected to the output shaft of the parallel shaft reducer 1, and the output shaft of the wheel-side reducer 3 directly drives the wheel. Through the two-stage reduction design of the parallel shaft reducer 1 and the wheel-side reducer 3, efficient and stable power transmission can be achieved to meet the application requirements of high load and low speed. The wet brake 2 is installed on the output shaft of the parallel shaft reducer 1, which can reduce the transmission path of the braking force and improve the braking efficiency. At the same time, the wet brake 2 is built into the parallel shaft reducer 1 to save space, which not only meets the safety requirements, but also meets the overall layout, weight and cost requirements of the underground coal truck.

[0029] In an illustrative embodiment, Figure 3 As shown, the parallel shaft reducer 1 includes: a first gear shaft 11, which is connected to the driving motor 4; a second gear shaft 12, which includes: a primary reduction tooth 121 and a driven tooth 122, and the primary reduction tooth 121 and the driven tooth 122 are coaxially arranged; a third gear shaft 13, which includes: a secondary reduction tooth 131 and a connecting tooth 132, and the secondary reduction tooth 131 and the connecting tooth 132 are coaxially arranged; the primary reduction tooth 121 is meshed with the first gear shaft 11, and the driven tooth 122 is meshed with the secondary reduction tooth 131; the wet brake 2 is arranged on the third gear shaft 13; and the wheel-side reducer 3 is connected to the connecting tooth 132.

[0030] The axes of the first gear shaft 11, the second gear shaft 12 and the third gear shaft 13 are arranged in parallel. The first gear shaft 11 serves as the input shaft of the parallel shaft reducer 1. The output shaft of the driving motor 4 is connected to the first gear shaft 11. The driving motor 4 rotates to drive the first gear shaft 11 to rotate, and the first gear shaft 11 drives the primary reduction gear 121 of the second gear shaft 12 to rotate; since the primary reduction gear 121 and the driven gear 122 are on the same axis, the driven gear 122 rotates together with the primary reduction gear 121, so the driven gear 122 of the second gear shaft 12 drives the secondary reduction gear 131 of the third gear shaft 13 to rotate; similarly, the secondary reduction gear 131 and the connecting gear 132 are on the same axis, so the connecting gear 132 rotates together with the secondary reduction gear 131, and the connecting gear 132, as the output shaft of the parallel shaft reducer 1, transmits power to the wheel-side reducer 3. Since the gear diameter of the primary reduction tooth 121 is larger than the gear diameter of the first gear shaft 11, the first gear shaft 11 performs a first reduction when driving the primary reduction tooth 121 to rotate; similarly, the gear diameter of the primary reduction tooth 121 is larger than the gear diameter of the driven tooth 122, and the gear diameter of the secondary reduction tooth 131 is larger than the gear diameter of the driven tooth 122, so the driven tooth 122 of the second gear shaft 12 drives the secondary reduction tooth 131 of the third gear shaft 13 to rotate, and performs a second reduction, thereby realizing the reduction output through gear meshing.

[0031] The wet brake 2 acts directly on the third gear shaft 13, with high braking efficiency, avoiding spark generation and good safety. The first gear shaft 11, the second gear shaft 12, the third gear shaft 13 and the wet brake 2 are all installed in the parallel shaft housing 16, which saves space and meets both safety requirements and the overall layout, weight and cost requirements of the underground coal truck. The parallel shaft housing 16 is filled with lubricating oil to provide lubrication for the meshing rotation between the gears. One of the main functions of lubricating oil is to reduce friction and wear between gears. When the gears are in the meshing process, the lubricating oil can form a layer of oil film to separate the two contacting tooth surfaces, thereby reducing the friction coefficient, reducing energy loss and tooth surface wear; at the same time, the lubricating oil can also play a cooling role, which can effectively prevent the gears from being deformed or damaged due to overheating, and improve the stability of the gear transmission.

[0032] In an illustrative embodiment, Figure 5 As shown, the parallel shaft reducer 1 further includes: a fourth gear shaft 14 , the fourth gear shaft 14 is meshed with the primary reduction gear 121 , and the fourth gear shaft 14 is used to drive the hydraulic pump 5 .

[0033] The fourth gear shaft 14 is connected to the hydraulic pump 5, and the first-stage reduction gear 121 rotates to drive the fourth gear shaft 14 to rotate. The fourth gear shaft 14 provides power for the hydraulic pump 5, and the hydraulic pump 5 is used to provide power for the hydraulic system. The power of the drive motor 4 is decelerated and transmitted to the hydraulic pump 5 through the fourth gear shaft 14, which is equivalent to reducing the need for a separate hydraulic pump reducer in the power transmission system, which not only simplifies the structure of the power transmission system, but also reduces the cost of maintenance and replacement of parts; at the same time, the functions of the parallel shaft reducer 1 and the hydraulic pump 5 are integrated together, which improves the integration of the entire power transmission system, making the structure more compact and occupying less space.

[0034] In an illustrative embodiment, Figure 4 As shown, the fourth gear shaft 14 includes: a power take-off gear 141, and a one-way clutch 142 is provided inside the power take-off gear 141; the one-way clutch 142 is connected to the power take-off gear 141 through a torsion limit plate 143, and the one-way clutch 142 is used to make the output shaft rotate in one direction.

[0035] Since the hydraulic pump 5 requires power for unidirectional rotation, a one-way clutch 142 is used to make the output shaft rotate in one direction. The one-way clutch 142 is characterized in that the output shaft is allowed to rotate in only one direction, while in the other direction it is in a free state or a locked state; the power take-off gear 141 is a cylinder, and a gear meshing with the primary reduction gear 121 is provided on the outer surface. The rotation of the primary reduction gear 121 drives the power take-off gear 141 to rotate, and the power is transmitted to the one-way clutch 142 through the torsion limit plate 143, so that the output shaft rotates in one direction.

[0036] In an exemplary embodiment, the axis of the fourth gear shaft 14 is in the same straight line as the axis of the third gear shaft 13 .

[0037] The fourth gear shaft 14 is the output shaft of the hydraulic pump 5, and the third gear shaft 13 is the output shaft of the wheel-side reducer 3. The coincidence of the axis of the fourth gear shaft 14 and the axis of the third gear shaft 13 helps to reduce vibration and noise during the transmission process, because when power is transmitted on the same straight line, it is easier to maintain load balance and stability.

[0038] In an illustrative embodiment, Figure 2 As shown, the parallel shaft reducer 1 further includes: a fifth gear shaft 15 , the fifth gear shaft 15 is meshed with the secondary reduction gear 131 , and the fifth gear shaft 15 is used to drive the cooling lubrication pump 6 .

[0039] The fifth gear shaft 15 is connected to the cooling lubrication pump 6, and the rotation of the secondary reduction gear 131 drives the fifth gear shaft 15 to rotate. The fifth gear shaft 15 provides power for the cooling lubrication pump 6. The cooling lubrication pump 6 is used to circulate the lubricating oil in the parallel shaft housing 16, pump the high-temperature lubricating oil into the radiator, and the lubricating oil flows back to the parallel shaft housing 16 after cooling. The power of the drive motor 4 is decelerated and transmitted to the cooling lubrication pump 6 through the fifth gear shaft 15, and lubrication and heat dissipation are integrated, which improves the integration of the entire power transmission system, makes the structure more compact, occupies less space, is light in weight, and saves costs.

[0040] In an illustrative embodiment, a connecting bracket 7 is provided between the parallel shaft reducer 1 and the wheel-side reducer 3 , and a heat sink 71 is provided on the connecting bracket 7 ; the heat sink 71 is connected to the cooling lubrication pump 6 through a pipeline.

[0041] The connecting bracket 7 is used to fix the parallel shaft reducer 1 and the wheel-side reducer 3 to ensure that the relative position between the two is stable. The cooling lubrication pump 6 pumps the high-temperature lubricating oil into the heat sink 71. When the lubricating oil flows through the heat sink 71, it will exchange heat with the surrounding environment, thereby releasing heat and reducing its own temperature; the cooled lubricating oil flows back into the parallel shaft housing 16, and continues to play its lubricating and cooling role to ensure the normal operation of the parallel shaft reducer 1. As the parallel shaft reducer 1 continues to work, the lubricating oil will heat up again, and then be pumped out by the cooling lubrication pump 6 again and sent to the heat sink 71 for cooling, forming a continuous circulation process. The cooling lubrication pump 6 and the heat sink 71 together constitute an effective cooling and lubrication system, ensuring the stable and efficient operation of the power transmission system.

[0042] In an illustrative embodiment, a pressure sensor 61 is provided on the pipeline between the heat sink 71 and the cooling lubrication pump 6 .

[0043] The pressure sensor 61 is used to measure and monitor the pressure of the lubricating oil in the pipeline, and can convert the pressure in the pipeline into an electrical signal in real time for monitoring and analysis. If the pressure in the pipeline increases abnormally, it may indicate problems such as blockage or excessive wear; if the pressure is too low, it may indicate problems such as leakage or insufficient pumping capacity. By monitoring the changes in pipeline pressure, timely measures can be taken, such as checking for leaks, replacing lubricating oil or replacing worn parts, to ensure the continuous and stable operation of the power transmission system.

[0044] In an illustrative embodiment, the wheel-side reducer 3 includes: a wheel-side housing 31 , in which a planetary gear set 32 ​​is arranged; the planetary gear set 32 ​​is connected to the output shaft of the parallel shaft reducer 1 .

[0045] The wheel side housing 31 is used to accommodate the planetary gear set 32, providing necessary protection and support for it; the planetary gear set 32 ​​includes: a sun gear, a planetary gear, a planetary carrier and an inner gear ring, wherein the sun gear is meshed with the connecting teeth 132; the planetary gear is a gear that rotates around the sun gear; the planetary carrier is a component that supports the planetary gear, which rotates while the planetary gear revolves around the sun gear, and the planetary carrier is connected to the output shaft of the wheel side reducer 3, and transmits the power of the planetary gear set 32 ​​after deceleration to the wheels or other driving components; the inner gear ring is a fixed annular gear located outside the planetary gear and meshed with the planetary gear, and the inner gear ring can provide a fixed gear ratio for the planetary gear. The power of the drive motor 4 is reduced by the parallel shaft reducer 1, and is transmitted to the sun gear of the planetary gear set 32 ​​through the connecting teeth 132, and then the power output is realized through the planetary gear and the planetary carrier, which can achieve a larger reduction ratio and torque output with higher efficiency.

[0046] Based on a power transmission system provided in the above embodiment, some embodiments of the present application further provide a coal truck, including the power transmission system of the above embodiment. Since the coal truck provided in this embodiment has a power transmission system provided in any of the above embodiments, the coal truck has all the beneficial effects of the power transmission system provided in any of the above embodiments, which will not be described in detail here.

[0047] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0050] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0051] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A power transmission system, characterized in that: include: A parallel shaft reducer (1), wherein an input shaft of the parallel shaft reducer (1) is connected to a drive motor (4); A wheel-side reducer (3) connected to the output shaft of the parallel shaft reducer (1); A wet brake (2) is arranged on the output shaft of the parallel shaft reducer (1).

2. A power transmission system according to claim 1, characterized in that: The parallel shaft reducer (1) comprises: A first gear shaft (11) connected to the drive motor (4); A second gear shaft (12), the second gear shaft (12) comprising: a primary reduction tooth (121) and a driven tooth (122), the primary reduction tooth (121) and the driven tooth (122) being coaxially arranged; A third gear shaft (13), the third gear shaft (13) comprising: a secondary reduction tooth (131) and a connecting tooth (132), the secondary reduction tooth (131) and the connecting tooth (132) being coaxially arranged; The primary reduction teeth (121) mesh with the first gear shaft (11), and the driven teeth (122) mesh with the secondary reduction teeth (131); The wet brake (2) is arranged on the third gear shaft (13); The wheel-side reducer (3) is connected to the connecting teeth (132).

3. A power transmission system as claimed in claim 2, characterized in that: The parallel shaft reducer (1) further comprises: a fourth gear shaft (14), the fourth gear shaft (14) meshing with the primary reduction gear (121), the fourth gear shaft (14) being used to drive the hydraulic pump (5).

4. A power transmission system as claimed in claim 3, characterized in that: The fourth gear shaft (14) comprises: a power take-off gear (141), wherein a one-way clutch (142) is provided inside the power take-off gear (141); The one-way clutch (142) is connected to the power take-off gear (141) via a torsion limiting plate (143), and the one-way clutch (142) is used to enable the output shaft to rotate in one direction.

5. A power transmission system as claimed in claim 3, characterized in that: The axis of the fourth gear shaft (14) and the axis of the third gear shaft (13) are on the same straight line.

6. A power transmission system as claimed in claim 2, characterized in that: The parallel shaft reducer (1) further comprises: a fifth gear shaft (15), the fifth gear shaft (15) meshing with the secondary reduction gear (131), the fifth gear shaft (15) being used to drive a cooling lubrication pump (6).

7. A power transmission system as claimed in claim 6, characterized in that: A connecting bracket (7) is provided between the parallel shaft reducer (1) and the wheel-side reducer (3), and a heat sink (71) is provided on the connecting bracket (7); The heat sink (71) is connected to the cooling lubrication pump (6) via a pipeline.

8. A power transmission system as claimed in claim 7, characterized in that: A pressure sensor (61) is provided on the pipeline between the heat sink (71) and the cooling lubrication pump (6).

9. A power transmission system as claimed in claim 1, characterized in that: The wheel-side reducer (3) comprises: a wheel-side housing (31), wherein a planetary gear set (32) is arranged inside the wheel-side housing (31); the planetary gear set (32) is connected to the output shaft of the parallel shaft reducer (1).

10. A coal transport vehicle, characterized in that: include: A power transmission system as claimed in any one of claims 1 to 9.

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