Transmission system and engineering machinery

Abstract

The invention belongs to the technical field of engineering machinery, and discloses a transmission system and engineering machinery. The transmission system comprises an integrated shell, a motor assembly, a brake assembly and a speed reducer assembly, the motor assembly, the brake assembly and the speed reducer assembly are arranged in the integrated shell and distributed in the first direction, an output piece of the motor assembly is in transmission connection with an input piece of the speed reducer assembly through the brake assembly, and an output piece of the speed reducer assembly is connected with the hub. The integrated shell is provided with a cooling channel set, and the cooling channel set can conduct heat dissipation on the motor assembly, the brake assembly and the speed reducer assembly at the same time. By arranging the integrated shell, the structure of a transmission system can be simplified, the cost can be reduced, the machining consistency is good, the supporting rigidity is better, and transmission errors caused by structural deformation are reduced; the cooling channel group is arranged on the integrated shell, so that the motor assembly, the brake assembly and the speed reducer assembly can be cooled at the same time by only one cooling system, the utilization rate of the cooling system is improved, the cooling efficiency is high, and the service life of the system is prolonged.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and in particular to a transmission system and engineering machinery. Background Technology

[0002] Currently, electric drive transmission systems mainly adopt two structures: wheel-side type and wheel-hub type. The wheel-side type consists of four independent motors arranged laterally, with the motors and reducers integrated. The wheel-hub type is divided into two types: inner rotor and outer rotor. The inner rotor structure is similar to the wheel-side type, while the outer rotor is a low-speed direct drive system that does not require a reduction gear. Existing electric drive systems mostly use a split housing, which is structurally complex, has high manufacturing costs, and its heat dissipation performance needs improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a transmission system and engineering machinery that simplifies the structure of the transmission system, reduces costs, improves processing consistency, enhances support rigidity, increases heat dissipation efficiency, and improves the service life of the system.

[0004] To achieve this objective, the present invention adopts the following technical solution: The transmission system includes: The system includes an integrated housing and a motor assembly, a brake assembly, and a reducer assembly disposed within the integrated housing and distributed along a first direction. The output component of the motor assembly is connected to the input component of the reducer assembly via the brake assembly, and the output component of the reducer assembly is connected to a wheel hub. The integrated housing is provided with a cooling channel group, which can simultaneously dissipate heat from the motor assembly, the brake assembly, and the reducer assembly.

[0005] As a preferred technical solution for the transmission system, the inner wall of the integrated housing is provided with a first annular boss, the motor assembly is located on one side of the first annular boss along the first direction, the reducer assembly is located on the other side of the first annular boss along the first direction, and the brake assembly is located in the mounting cavity formed by the first annular boss.

[0006] As a preferred technical solution for the transmission system, the cooling channel group includes a first cooling channel, a second cooling channel, a third cooling channel, a fourth cooling channel, a fifth cooling channel, and a sixth cooling channel connected in sequence. The first cooling channel is located on the side of the first annular boss facing the motor assembly. The second, fourth, and sixth cooling channels all extend along the first direction, and at least one of the second, fourth, and sixth cooling channels can cover the brake assembly and the reducer assembly along the length range of the first direction. The third and fifth cooling channels are both arranged in a ring around the axis of the integrated housing. The integrated housing is provided with a liquid inlet and a liquid outlet. The liquid inlet is connected to the first cooling channel, and the liquid outlet is connected to the sixth cooling channel.

[0007] As a preferred technical solution for the transmission system, the first cooling channel includes multiple annular channels, which are concentrically distributed from the inside to the outside. Adjacent annular channels are connected end to end. The beginning of one of the innermost annular channel and the outermost annular channel is connected to the liquid inlet on the integrated housing, and the end of the other is connected to the second cooling channel.

[0008] As a preferred technical solution for the transmission system, the lengths of the second cooling channel and the sixth cooling channel along the first direction are greater than the length of the fourth cooling channel along the first direction.

[0009] As a preferred technical solution for the transmission system, the reducer assembly includes a first planetary gear set and a second planetary gear set connected in series, and the third cooling channel and the fifth cooling channel are respectively arranged around the first planetary gear set and the second planetary gear set.

[0010] As a preferred technical solution for the transmission system, a cover plate is provided on the side of the first annular boss facing the motor assembly, and a first cooling groove is provided on the cover plate. The first cooling groove and the first annular boss together form the first cooling channel.

[0011] As a preferred technical solution for the transmission system, a cooling ring is provided on the outer periphery of the integrated housing, and a third cooling groove and a fifth cooling groove are provided on the cooling ring. The third cooling groove and the fifth cooling groove together with the integrated housing form the third cooling channel and the fifth cooling channel.

[0012] As a preferred technical solution for the transmission system, the output component of the reducer assembly is provided with a heat dissipation fin plate.

[0013] Construction machinery, including the transmission system described in any of the above embodiments.

[0014] The beneficial effects of this invention are: This invention provides a transmission system including an integrated housing and a motor assembly, a brake assembly, and a reducer assembly disposed within the integrated housing and distributed along a first direction. The output component of the motor assembly is connected to the input component of the reducer assembly via the brake assembly, and the output component of the reducer assembly is connected to a wheel hub. A cooling channel assembly is provided on the integrated housing, capable of simultaneously dissipating heat from the motor assembly, brake assembly, and reducer assembly. By using an integrated housing and housing the motor assembly, brake assembly, and reducer assembly within it, the structure of the transmission system is simplified, costs are reduced, the machining requirements of a split housing structure are eliminated, machining consistency is improved, and support rigidity is enhanced, reducing the risk of transmission errors and increased heat generation due to structural deformation. Furthermore, by providing a cooling channel assembly on the integrated housing, a single cooling system can simultaneously dissipate heat from the motor assembly, brake assembly, and reducer assembly, improving the utilization rate of the cooling system and enabling precise heat dissipation from each heat source, resulting in high heat dissipation efficiency and extending the system's service life. Attached Figure Description

[0015] Figure 1 This is one of the cross-sectional views of the transmission system provided in the embodiments of the present invention; Figure 2 This is a second sectional view of the transmission system provided in an embodiment of the present invention; Figure 3 This is the third sectional view of the transmission system provided in the embodiment of the present invention; Figure 4 This is one of the cross-sectional views of the transmission system provided in the embodiments of the present invention; Figure 5 This is the second cross-sectional view of the transmission system provided in the embodiment of the present invention; Figure 6 This is the third cross-sectional view of the transmission system provided in the embodiment of the present invention.

[0016] In the picture: 11. Integrated housing; 111. First cooling channel; 111a. Annular channel; 111b. Head inlet; 111c. Tail outlet; 112. Second cooling channel; 113. Third cooling channel; 114. Fourth cooling channel; 115. Fifth cooling channel; 116. Sixth cooling channel; 117. First annular boss; 1171. Mounting cavity; 118. Second annular boss; 119. Weight reduction hole; 1110. Liquid inlet; 1111. Liquid outlet; 12. End cap; 13. Cover plate; 14. Cooling ring; 20. Motor assembly; 21. Stator; 22. Rotor; 30. Brake assembly; 31. Driving element; 32. Steel plate; 33. Friction pad; 34. Piston; 35. Spring; 40. Reducer assembly; 41. First sun gear; 42. First planet gear; 43. First planet carrier; 44. First internal gear; 45. Second sun gear; 46. Second planet gear; 47. Second planet carrier; 47. Heat dissipation fins; 48. Second internal gear; 50. Wheel hub. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0018] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0021] like Figures 1 to 6As shown, an embodiment of the present invention provides a transmission system, including an integrated housing 11 and a motor assembly 20, a brake assembly 30, and a reducer assembly 40 disposed within the integrated housing 11 and distributed along a first direction. The output component of the motor assembly 20 is connected to the input component of the reducer assembly 40 via the brake assembly 30, and the output component of the reducer assembly 40 is connected to a wheel hub 50. A cooling channel group is provided on the integrated housing 11, which can simultaneously dissipate heat from the motor assembly 20, the brake assembly 30, and the reducer assembly 40. By setting up an integrated housing 11 and housing the motor assembly 20, brake assembly 30, and reducer assembly 40 within it, the structure of the transmission system can be simplified, costs reduced, and the machining requirements of a split housing structure eliminated. This results in better machining consistency and improved support rigidity, reducing the risk of transmission errors and increased heat generation caused by structural deformation. Furthermore, by setting up a cooling channel group on the integrated housing 11, a single cooling system can simultaneously dissipate heat from the motor assembly 20, brake assembly 30, and reducer assembly 40, improving the utilization rate of the cooling system. It also enables precise heat dissipation from each heat source, resulting in high heat dissipation efficiency and extending the system's service life.

[0022] Reference Figure 1 The inner wall of the integrated housing 11 is provided with a first annular boss 117. The motor assembly 20 is located on one side of the first annular boss 117 along a first direction, and the reducer assembly 40 is located on the other side of the first annular boss 117 along the first direction. The brake assembly 30 is located in the mounting cavity 1171 formed by the first annular boss 117. The brake assembly 30 has an engaged state and a disengaged state. When the brake assembly 30 is in the engaged state, the power of the motor assembly 20 can be transmitted to the reducer assembly 40. When the brake assembly 30 is in the disengaged state, the power of the motor assembly 20 is cut off by the brake assembly 30, that is, the power of the motor assembly 20 cannot be transmitted to the reducer assembly 40.

[0023] Reference Figures 1 to 3The motor assembly 20 includes a stator 21 and a rotor 22. The stator 21 is fixed inside the integrated housing 11, and the rotor 22 is disposed inside the stator 21 and supported by bearings. The rotor 22 can rotate under the magnetic field of the stator 21. The rotor 22 is the output component of the motor assembly 20. The reducer assembly 40 includes a first planetary gear set and a second planetary gear set connected in series. The first planetary gear set includes a first sun gear 41, a first planetary gear set 42, a first planetary carrier set 43, and a first internal gear set 44. The second planetary gear set includes a second sun gear set 45, a second planetary gear set 46, a second planetary carrier set 47, and a second internal gear set 48. The first sun gear set 41 is the input component of the reducer assembly 40 and is connected to the rotor set 22 in the motor assembly 20 via a brake assembly 30. The first internal gear set 44 is fixed within the integrated housing 11. The first planetary carrier set 43 is connected to the second sun gear set 45. The second internal gear set 48 is fixed within the integrated housing 11. The second planetary carrier set 47 is the output component of the reducer assembly 40 and is connected to the hub set 50. Preferably, the second planetary carrier set 47 is provided with a heat dissipation fin plate 471. The heat dissipation fin plate 471 can improve the support strength of the second planetary carrier set 47 and agitate the air during system operation to achieve an auxiliary heat dissipation effect.

[0024] Reference Figure 2 The brake assembly 30 is a wet brake, including a driving member 31, steel plates 32, a driven member, friction plates 33, a piston 34, and a spring 35. The driving member 31 is connected to the rotor 22 of the motor assembly 20. The steel plates 32 are disposed on the driving member 31. The driven member is connected to the first sun gear 41. The friction plates 33 are disposed on the driven member. Several steel plates 32 and several friction plates 33 are arranged alternately. The piston 34 is movably disposed in the mounting cavity 1171. The spring 35 is disposed in the mounting cavity 1171 and is used to reset the piston 34. Under the action of pressurized oil, piston 34 can overcome the elastic force of spring 35 and move towards friction plate 33, so that the staggered steel plate 32 and friction plate 33 are pressed together, and the driving member 31 and driven member are combined into one. At this time, the power of motor assembly 20 can be transmitted to reducer assembly 40 through brake assembly 30. When it is necessary to cut off the power, the hydraulic oil in mounting cavity 1171 is released, piston 34 returns to its original position under the action of spring 35, releasing the pressure on friction plate 33, friction plate 33 separates from steel plate 32, and driving member 31 and driven member can rotate at different speeds. At this time, the power of motor assembly 20 is cut off.

[0025] Reference Figures 1 to 4The cooling channel group includes a first cooling channel 111, a second cooling channel 112, a third cooling channel 113, a fourth cooling channel 114, a fifth cooling channel 115, and a sixth cooling channel 116 connected in sequence. The first cooling channel 111 is located on the side of the first annular boss 117 facing the motor assembly 20. The second cooling channel 112, the fourth cooling channel 114, and the sixth cooling channel 116 are all distributed along a first direction, and at least one of the second cooling channel 112, the fourth cooling channel 114, and the sixth cooling channel 116 can cover the brake assembly 30 and the reducer assembly 40 along the length range of the first direction. The third cooling channel 113 and the fifth cooling channel 115 are all distributed in a ring around the axis of the integrated housing 11. The integrated housing 11 is provided with a liquid inlet 1110 and a liquid outlet 1111. The liquid inlet 1110 is connected to the first cooling channel 111, and the liquid outlet 1111 is connected to the sixth cooling channel 116. The coolant can flow into the first cooling channel 111 through the inlet 1110, and then flow through the first cooling channel 111, the second cooling channel 112, the third cooling channel 113, the fourth cooling channel 114, the fifth cooling channel 115 and the sixth cooling channel 116 in sequence before flowing out through the outlet 1111. By setting the first cooling channel 111 on the side of the first annular boss 117 facing the motor assembly 20, the motor assembly 20 and the brake assembly 30 can be effectively cooled simultaneously. By setting the second cooling channel 112, the fourth cooling channel 114 and the sixth cooling channel 116 to extend along the first direction, and setting the length of at least one of the second cooling channel 112, the fourth cooling channel 114 and the sixth cooling channel 116 along the first direction to cover the brake assembly 30 and the reducer assembly 40, at least one cooling channel can be used to cool the brake assembly 30 and the reducer assembly 40. By setting the third cooling channel 113 and the fifth cooling channel 115 to be distributed in a ring around the axis of the integrated housing 11, the integrated housing 11 can be cooled in all directions, effectively improving the heat dissipation efficiency of the system.

[0026] Reference Figure 4In this embodiment, the first cooling channel 111 includes multiple annular channels 111a, which are concentrically distributed from the inside to the outside. Two adjacent annular channels 111a are connected end to end. The inlet 111b of the innermost annular channel 111a and the outermost annular channel 111a are connected to the liquid inlet 1110 on the integrated housing 11, and the outlet 111c of the other annular channel 111a is connected to the second cooling channel 112. Taking the example where the inlet 111b at the beginning of the outermost annular channel 111a is connected to the liquid inlet 1110, and the outlet 111c at the end of the innermost annular channel 111a is connected to the second cooling channel 112, the flow direction of the coolant is explained. The coolant enters the outermost annular channel 111a through the liquid inlet 1110 and the inlet 111b, and flows from the outside to the inside through multiple annular channels 111a before entering the second cooling channel 112 through the outlet 111c at the end of the innermost annular channel 111a. This arrangement increases the flow path of the coolant within the first cooling channel 111, thereby improving heat dissipation efficiency.

[0027] Reference Figure 1 and Figure 3 In this embodiment, the lengths of the second cooling channel 112 and the sixth cooling channel 116 along the first direction are greater than the length of the fourth cooling channel 114 along the first direction. The second cooling channel 112 and the sixth cooling channel 116 play the main role in heat dissipation, and the fourth cooling channel 114 serves as a connecting channel between the third cooling channel 113 and the fifth cooling channel 115. This arrangement simplifies the structure of the cooling channel group while ensuring the structural strength of the integrated housing 11.

[0028] Reference Figure 1 and combined Figure 5 and Figure 6 As shown, in this embodiment, the third cooling channel 113 and the fifth cooling channel 115 are respectively arranged around the first planetary gear set and the second planetary gear set. This arrangement allows the third cooling channel 113 and the fifth cooling channel 115 to not only provide all-around heat dissipation for the integrated housing 11, but also to enhance precise heat dissipation for the first and second planetary gear sets, further improving heat dissipation efficiency.

[0029] Reference Figure 1A cover plate 13 is provided on the side of the first annular boss 117 facing the motor assembly 20. A first cooling groove is provided on the cover plate 13, and the first cooling groove and the first annular boss 117 enclose to form a first cooling channel 111. This arrangement facilitates the machining of the first cooling channel 111. A cooling ring 14 is provided on the outer periphery of the integrated housing 11. A third cooling groove and a fifth cooling groove are provided on the cooling ring 14, and the third cooling groove and the fifth cooling groove enclose to the integrated housing 11 to form a third cooling channel 113 and a fifth cooling channel 115. This arrangement facilitates the machining of the third cooling channel 113 and the fifth cooling channel 115.

[0030] Reference Figure 1 The integrated housing 11 has open ends. The open end near the motor assembly 20 is covered by the end cap 12, and the open end near the reducer assembly 40 allows the second planetary carrier 47 to extend and connect with the hub 50.

[0031] Reference Figure 1 The integrated housing 11 is provided with weight reduction holes 119 to reduce the weight of the system and reduce energy loss.

[0032] Reference Figure 1 The outer wall of the integrated housing 11 is provided with a second annular boss 118, which is located between the motor assembly 20 and the reducer assembly 40. The hub 50 is located on the outside of the integrated housing 11 and is installed between the second annular boss 118 and the second planetary carrier 47. This arrangement facilitates the installation of the hub 50.

[0033] This invention also provides an engineering machine, including the transmission system described above. Optionally, the engineering machine is a loader or bulldozer, etc.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A transmission system, characterized in that, include: An integrated housing (11) and a motor assembly (20), a brake assembly (30) and a reducer assembly (40) disposed within the integrated housing (11) and distributed along a first direction. The output of the motor assembly (20) is connected to the input of the reducer assembly (40) via the brake assembly (30). The output of the reducer assembly (40) is connected to a wheel hub (50). The integrated housing (11) is provided with a cooling channel group, which can simultaneously dissipate heat from the motor assembly (20), the brake assembly (30) and the reducer assembly (40).

2. The transmission system according to claim 1, characterized in that, The inner wall of the integrated housing (11) is provided with a first annular boss (117), the motor assembly (20) is located on one side of the first annular boss (117) along the first direction, the reducer assembly (40) is located on the other side of the first annular boss (117) along the first direction, and the brake assembly (30) is located in the mounting cavity (1171) formed by the first annular boss (117).

3. The transmission system according to claim 2, characterized in that, The cooling channel group includes a first cooling channel (111), a second cooling channel (112), a third cooling channel (113), a fourth cooling channel (114), a fifth cooling channel (115), and a sixth cooling channel (116) connected in sequence. The first cooling channel (111) is located on the side of the first annular boss (117) facing the motor assembly (20). The second cooling channel (112), the fourth cooling channel (114), and the sixth cooling channel (116) all extend along the first direction. At least one of the cooling channel (114) and the sixth cooling channel (116) can cover the brake assembly (30) and the reducer assembly (40) along the length range of the first direction. The third cooling channel (113) and the fifth cooling channel (115) are both distributed in a ring around the axis of the integrated housing (11). The integrated housing (11) is provided with a liquid inlet (1110) and a liquid outlet (1111). The liquid inlet (1110) is connected to the first cooling channel (111), and the liquid outlet (1111) is connected to the sixth cooling channel (116).

4. The transmission system according to claim 3, characterized in that, The first cooling channel (111) includes multiple annular channels (111a), which are concentrically distributed from the inside to the outside. Two adjacent annular channels (111a) are connected end to end. The first end of one of the innermost annular channel (111a) and the outermost annular channel (111a) is connected to the liquid inlet (1110) on the integrated housing (11), and the tail end of the other is connected to the second cooling channel (112).

5. The transmission system according to claim 3, characterized in that, The lengths of the second cooling channel (112) and the sixth cooling channel (116) along the first direction are greater than the lengths of the fourth cooling channel (114) along the first direction.

6. The transmission system according to claim 3, characterized in that, The reducer assembly (40) includes a first planetary gear set and a second planetary gear set connected in series, and the third cooling channel (113) and the fifth cooling channel (115) are respectively arranged around the first planetary gear set and the second planetary gear set.

7. The transmission system according to any one of claims 3-6, characterized in that, The first annular boss (117) has a cover plate (13) on the side facing the motor assembly (20), and the cover plate (13) has a first cooling groove. The first cooling groove and the first annular boss (117) enclose the first cooling channel (111).

8. The transmission system according to any one of claims 3-6, characterized in that, A cooling ring (14) is provided on the outer periphery of the integrated housing (11). A third cooling groove and a fifth cooling groove are provided on the cooling ring (14). The third cooling groove and the fifth cooling groove are enclosed with the integrated housing (11) to form the third cooling channel (113) and the fifth cooling channel (115).

9. The transmission system according to any one of claims 1-6, characterized in that, The output component of the reducer assembly (40) is provided with a heat dissipation fin plate (471).

10. Construction machinery, characterized in that, Includes the transmission system as described in any one of claims 1-9.

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