Two-gear speed reducer and electric drive axle transmission device

Abstract

The utility model provides a two-gear speed reducer and an electric drive axle transmission device, and relates to the technical field of transmission equipment. An input shaft; a half shaft; a coupling shaft; the gear shifting mechanism comprises a first-gear driving gear, a first-gear driven gear, a second-gear driving gear, a second-gear driven gear and a bidirectional gear shifting spline, the first-gear driving gear and the second-gear driving gear are installed on the input shaft, the first-gear driven gear and the second-gear driven gear are rotatably installed on the half shaft, and the bidirectional gear shifting spline is movably installed on the half shaft; the power takeoff is connected with a connecting shaft, an input gear is arranged on the connecting shaft, and the input gear is meshed with the second-gear driven gear; and the planet wheel assembly is connected with the half shaft and can be connected with the hub through the planet wheel assembly. The double-motor hub driving device has the advantages that when the double-motor hub driving device is applied to a heavy truck, the double-motor hub is used for driving the two hubs to rotate to provide larger power, a traditional differential mechanism is avoided, power loss is reduced, and larger wheel end torque can be provided for the heavy truck.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission equipment, in particular to a two-speed reducer and an electric drive axle transmission device. Background Art

[0002] New energy heavy trucks such as hybrid, pure electric, extended-range, and fuel cell use electric drive axles to achieve vehicle power transmission. Existing electric drive axle reduction mechanisms are mostly driven by a single motor and are mostly two-axle or intermediate shaft structure transmissions. 18-25T heavy trucks that transport heavy goods such as construction materials and large equipment have high requirements for load capacity, which requires the electric drive axle reduction mechanism to provide a larger wheel-end torque, especially when it needs to adapt to harsh road conditions. The current electric drive axle reduction mechanism is driven by a single motor, which can provide limited torque, and the power is output through the differential, which will result in a large power loss and limit the wheel-end torque. Utility Model Content

[0003] In view of this, an embodiment of the utility model provides a two-speed reducer and an electric drive axle transmission device.

[0004] The embodiment of the utility model provides a two-speed reducer, comprising

[0005] Motor;

[0006] An input shaft connected to the output shaft of the motor;

[0007] A half shaft, which is arranged parallel to the input shaft;

[0008] A coupling shaft, which is arranged parallel to the input shaft;

[0009] A shift mechanism, comprising a first gear driving gear, a first gear driven gear, a second gear driving gear, a second gear driven gear and a bidirectional shift spline, wherein the first gear driving gear and the second gear driving gear are mounted on the input shaft, the first gear driven gear and the second gear driven gear are rotatably mounted on the half shaft, the first gear driving gear is meshed with the first gear driven gear, the second gear driving gear is meshed with the second gear driven gear, and the bidirectional shift spline is movably mounted on the half shaft and can be selectively key-connected with the first gear driven gear or the second gear driven gear;

[0010] A power take-off connected to the coupling shaft, the coupling shaft being provided with an input gear, the input gear being meshed with the second gear driven gear;

[0011] and a planetary gear assembly, which is connected to the half shafts and can be connected to the wheel hub through the planetary gear assembly.

[0012] Furthermore, the planetary gear assembly is arranged in the wheel hub, and the planetary gear assembly includes a sun gear, a plurality of planetary gears, a retaining frame and a ring gear. The half shaft extends into the wheel hub and is connected to the sun gear. The ring gear is fixedly arranged on the periphery of the sun gear. The retaining frame is arranged in the ring gear. Each of the planetary gears is installed in the retaining frame and is respectively meshed with the sun gear. The retaining frame is connected to the wheel hub.

[0013] Furthermore, the wheel hub comprises a wheel hub inner cover, a wheel hub end cover and a movable wheel hub sleeve, the wheel hub inner cover and the wheel hub end cover are respectively installed on the inner and outer sides of the movable wheel hub sleeve, and the retaining frame is fixedly connected to the wheel hub end cover.

[0014] Furthermore, the bidirectional shift spline is slidably installed on the half-shaft and is located between the first gear driven gear and the second gear driven gear. The bidirectional shift spline can be connected to the first gear driven gear key by sliding in one direction, and can be connected to the second gear driven gear key by sliding in another direction.

[0015] Furthermore, it also includes a main reducer housing, the half shaft is rotatably installed in the middle of the main reducer housing, the input shaft and the connecting shaft are rotatably installed inside the main reducer housing and are respectively located on both sides of the half shaft.

[0016] Furthermore, the motor and the power take-off are arranged outside the main reducer housing and are located on the inner side, and the wheel hub is arranged on the outer side of the main reducer housing.

[0017] Furthermore, the input shaft, the connecting shaft and the half shaft are all rotatably mounted in the main reducer housing via bearings.

[0018] Furthermore, the input shaft is coaxially arranged with the output shaft of the motor and is connected via a spline.

[0019] Furthermore, the first gear driving gear, the first gear driven gear, the second gear driving gear, the second gear driven gear, and the input gear are all cylindrical bevel gears.

[0020] In addition, the utility model also provides an electric drive axle transmission device, including a bridge housing and two of the above-mentioned two-speed reducers, and the two two-speed reducers are respectively installed at both ends of the bridge housing.

[0021] The beneficial effects brought about by the technical solution provided by the embodiment of the utility model are:

[0022] 1. The utility model is a two-speed reducer and electric drive axle transmission device. When applied to heavy trucks, dual motor wheel sides are used to drive the two wheel hubs to rotate to provide greater power, and avoid the use of traditional differentials, reducing power loss. It can provide heavy trucks with greater wheel end torque, so that heavy trucks can adapt to various complex road conditions, so that electric heavy trucks can continue to work in a high-efficiency area under various working conditions.

[0023] 2. The utility model provides a two-speed reducer and electric drive axle transmission device. Since the motor of each speed reducer adopts independent electronic control, it can ensure that the power output of each wheel is in a high-efficiency state, and the energy consumption ratio is better.

[0024] 3. The utility model is a two-speed reducer and electric drive axle transmission device, when used in heavy-duty trucks, can be equipped with two different power take-offs at the same time, and power can be output to the on-board operating equipment of the new energy heavy-duty truck through the power take-offs, providing power for the on-board operating equipment, and realizing multi-functional operations.

[0025] 4. The utility model provides a two-speed reducer and electric drive axle transmission device, which arranges the planetary gear assembly inside the wheel hub, reduces the size of the reducer, reduces the weight of the reducer housing, has a compact structure, reduces the size of the drive axle, and facilitates the layout of the vehicle chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of an electric drive axle transmission device of the utility model;

[0027] Figure 2 This is a transmission principle diagram of a two-speed reducer of the utility model;

[0028] Figure 3 It is a torque transmission circuit diagram of a two-speed reducer with a first-speed transmission ratio of the utility model;

[0029] Figure 4 The utility model discloses a torque transmission circuit diagram of a two-speed reducer with a second-speed transmission ratio.

[0030] In the figure: 1. motor; 2. first gear driving gear; 3. input shaft; 4. second gear driving gear; 5. main reducer housing; 6. second gear driven gear; 7. input gear; 8. two-way shift spline; 9. connecting shaft; 10. first gear driven gear; 11. ring gear; 12. planetary gear; 13. cage; 14. sun gear; 15. hub end cover; 16. hub inner cover; 17. movable hub sleeve; 18. half shaft; 19. power take-off; 20. bridge housing. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will further describe the implementation of the utility model in conjunction with the accompanying drawings. The following is a preferred embodiment of the utility model among multiple possible embodiments, which is intended to provide a basic understanding of the utility model, but is not intended to confirm the key or decisive elements of the utility model or limit the scope of protection.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0035] It should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] Please refer to Figure 2 The embodiment of the utility model provides a two-speed reducer, which is applied to the electric drive axle of a new energy heavy-duty truck, and mainly includes a motor 1, an input shaft 3, a half shaft 18, a connecting shaft 9, a shift mechanism, a power take-off 19 and a planetary gear 12 assembly.

[0037] The motor 1 is used as the input of the two-speed reducer and is connected to the input shaft 3. Specifically, the motor 1 has an output shaft, and the input shaft 3 is coaxially arranged with the output shaft of the motor 1 and connected via a spline.

[0038] The half shaft 18 is used as the output of the two-speed speed reducer and is arranged in parallel with the input shaft 3. Similarly, the connecting shaft 9 is also arranged in parallel with the input shaft 3.

[0039] The shift mechanism mainly includes a first-gear driving gear 2 , a first-gear driven gear 10 , a second-gear driving gear 4 , a second-gear driven gear 6 and a bidirectional shift spline 8 .

[0040] Generally, in order to realize the installation and protection of the input shaft 3, the half shaft 18, the connecting shaft 9 and the shift mechanism, the two-speed reducer further includes a main reducer housing 5, the half shaft 18 is rotatably mounted in the middle of the main reducer housing 5, and the input shaft 3 and the connecting shaft 9 are rotatably mounted inside the main reducer housing 5 and are respectively located on both sides of the half shaft 18. Here, both ends of the input shaft 3, the connecting shaft 9 and the half shaft 18 are rotatably mounted in the main reducer housing 5 through bearings.

[0041] The first gear driving gear 2 and the second gear driving gear 4 are mounted on the input shaft 3, and the input shaft 3 can drive the first gear driving gear 2 and the second gear driving gear 4 to rotate. The first gear driven gear 10 and the second gear driven gear 6 are rotatably mounted on the half shaft 18. The first gear driving gear 2 is meshed with the first gear driven gear 10, and the second gear driving gear 4 is meshed with the second gear driven gear 6. Here, the first gear driven gear 10 and the second gear driven gear 6 can both rotate independently relative to the half shaft 18.

[0042] The two-way shift spline 8 is movably mounted on the half shaft 18 and can be selectively key-connected with the first gear driven gear 10 or the second gear driven gear 6. Specifically, the two-way shift spline 8 is slidably mounted on the half shaft 18 and is located between the first gear driven gear 10 and the second gear driven gear 6. The two-way shift spline 8 can be key-connected with the first gear driven gear 10 by sliding in one direction, and can be key-connected with the second gear driven gear 6 by sliding in the other direction.

[0043] The power take-off 19 is connected to the coupling shaft 9, and the coupling shaft 9 is provided with an input gear 7, and the input gear 7 is meshed with the second gear driven gear 6. In some embodiments, in order to meet the requirements of the external dimension layout of the two-speed reducer, the motor 1 and the power take-off 19 are arranged outside the main reducer housing 5 and are located on the inner side, and the wheel hub is arranged on the outer side of the main reducer housing 5.

[0044] In order to make the structure compact and reduce space occupation, the first gear driving gear 2, the first gear driven gear 10, the second gear driving gear 4, the second gear driven gear 6, and the input gear 7 are all cylindrical helical gears.

[0045] The planetary gear 12 assembly is connected to the half shaft 18 and can be connected to the wheel hub through the planetary gear 12 assembly. Specifically, the planetary gear 12 assembly is arranged in the wheel hub, and the planetary gear 12 assembly includes a sun gear 14, a plurality of planetary gears 12, a retainer 13 and a ring gear 11. The half shaft 18 extends into the wheel hub and is connected to the sun gear 14. The ring gear 11 is fixedly arranged on the periphery of the sun gear 14. The retainer 13 is arranged in the ring gear 11. Each of the planetary gears 12 is installed in the retainer 13 and is respectively meshed with the sun gear 14. The retainer 13 is connected to the wheel hub.

[0046] The half shaft 18 is connected to the wheel hub through the planetary gear 12 assembly, thereby driving the wheel hub to rotate. The wheel hub generally includes a wheel hub inner cover 16, a wheel hub end cover 15 and a movable wheel hub cover 17. The wheel hub inner cover 16 and the wheel hub end cover 15 are respectively installed on the inner and outer sides of the movable wheel hub cover 17. The gear ring 11 is fixedly installed in the movable wheel hub cover 17. The retainer 13 is fixedly connected to the wheel hub end cover 15. The rotation of the retainer 13 can drive the wheel hub end cover 15 to rotate, thereby driving the overall rotation of the wheel hub.

[0047] The two-speed reducer has two power outputs:

[0048] Please refer to Figure 3 ,Depend on Figure 3 It can be seen from the first gear torque transmission route diagram that: the motor 1 transmits the torque to the first gear driving gear 2, which is then transmitted to the first gear driven gear 10 by the first gear driving gear 2, and the two-way shift spline 8 is controlled to move rightward to be key-connected with the first gear driven gear 10, so that the torque is output from the first gear driven gear 10 to the half shaft 18, and then transmitted to the sun gear 14 of the planetary gear 12 assembly through the half shaft 18, and the sun gear 14 of the planetary gear 12 assembly and each planetary gear 12 of the planetary gear 12 assembly transmit the torque to the retainer 13 of the planetary gear 12 assembly, and then the retainer 13 of the planetary gear 12 assembly transmits the torque to the wheel hub. The first gear driving gear 2 and the first gear driven gear 10 are meshed and transmitted to form a first gear transmission ratio.

[0049] Please refer to Figure 4 ,Depend on Figure 4It can be seen from the second gear torque transmission route diagram that the motor 1 transmits the torque to the second gear driving gear 4, which is then transmitted to the second gear driven gear 6 by the second gear driving gear 4, and the two-way shift spline 8 is controlled to move leftward to be key-connected with the second gear driven gear 6, so that the torque is output from the second gear driven gear 6 to the half shaft 18, and then transmitted to the sun gear 14 of the planetary gear 12 assembly through the half shaft 18, and the sun gear 14 of the planetary gear 12 assembly and each planetary gear 12 of the planetary gear 12 assembly transmit the torque to the retainer 13 of the planetary gear 12 assembly, and then the retainer 13 of the planetary gear 12 assembly transmits the torque to the wheel hub. The second gear driving gear 4 and the second gear driven gear 6 are meshed and transmitted to form a second gear transmission ratio.

[0050] When the two-speed reducer is working, the torque transmission path of the power take-off 19 is: the motor 1 transmits the torque to the second-speed driving gear 4, which is then transmitted to the second-speed driven gear 6 by the second-speed driving gear 4, and then transmitted to the input gear 7 by the second-speed driven gear 6, and then transmitted to the connecting shaft 9 by the input gear 7 for output to the power take-off 19.

[0051] It should be noted that the first gear transmission ratio is relatively large, and the second gear transmission ratio is relatively small. The two-gear reducer adopts the first gear transmission ratio with a relatively large transmission ratio for climbing; and adopts the second gear transmission ratio with a relatively small transmission ratio for high-speed driving, so as to ensure the smoothness of the vehicle driving when the vehicle shifts gears, so that the new energy heavy-duty truck can adapt to efficient work under various working conditions. And when the two-gear reducer is working, the power is output to the on-board operating equipment of the new energy heavy-duty truck through the power take-off 19, providing power for the on-board operating equipment, and realizing multi-functional operation.

[0052] In addition, please refer to Figure 2 The utility model also provides an electric drive axle transmission device, including an axle housing 20 and two of the above-mentioned two-speed reducers, the two two-speed reducers are respectively installed at both ends of the axle housing 20. Specifically, the two two-speed reducers are symmetrically installed at both ends of the axle housing 20, the main reducer housing 5 of each of the two-speed reducers is connected to one end of the axle housing 20, and the end of the half shaft 18 away from the wheel hub is rotatably installed in the axle housing 20 through a bearing. In this way, the electric drive axle transmission device adopts dual motor 1 wheel side drive, has a greater torque output, and the two motors 1 adopt independent electronic control, so it can ensure that the power output of each wheel is in an efficient state, and the energy consumption ratio is better.

[0053] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0054] In the absence of conflict, the above embodiments and features in the embodiments can be combined with each other. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A two-speed reducer, characterized in that: include Motor; An input shaft connected to the output shaft of the motor; A half shaft, which is arranged parallel to the input shaft; A coupling shaft, which is arranged parallel to the input shaft; A shift mechanism, comprising a first gear driving gear, a first gear driven gear, a second gear driving gear, a second gear driven gear and a bidirectional shift spline, wherein the first gear driving gear and the second gear driving gear are mounted on the input shaft, the first gear driven gear and the second gear driven gear are rotatably mounted on the half shaft, the first gear driving gear is meshed with the first gear driven gear, the second gear driving gear is meshed with the second gear driven gear, and the bidirectional shift spline is movably mounted on the half shaft and can be selectively key-connected with the first gear driven gear or the second gear driven gear; A power take-off connected to the coupling shaft, the coupling shaft being provided with an input gear, the input gear being meshed with the second gear driven gear; and a planetary gear assembly, which is connected to the half shafts and can be connected to the wheel hub through the planetary gear assembly.

2. A two-speed reducer as claimed in claim 1, characterized in that: The planetary gear assembly is arranged in the wheel hub, and the planetary gear assembly includes a sun gear, a plurality of planetary gears, a retaining frame and a ring gear. The half shaft extends into the wheel hub and is connected to the sun gear. The ring gear is fixedly arranged on the periphery of the sun gear. The retaining frame is arranged in the ring gear. Each of the planetary gears is installed in the retaining frame and is respectively meshed with the sun gear. The retaining frame is connected to the wheel hub.

3. A two-speed reducer as claimed in claim 2, characterized in that: The wheel hub comprises a wheel hub inner cover, a wheel hub end cover and a movable wheel hub sleeve. The wheel hub inner cover and the wheel hub end cover are respectively installed on the inner and outer sides of the movable wheel hub sleeve, and the retaining frame is fixedly connected to the wheel hub end cover.

4. A two-speed reducer as claimed in claim 1, characterized in that: The two-way shift spline is slidably installed on the half shaft and is located between the first gear driven gear and the second gear driven gear. The two-way shift spline can be connected to the first gear driven gear key by sliding in one direction, and can be connected to the second gear driven gear key by sliding in the other direction.

5. A two-speed reducer as claimed in claim 1, characterized in that: It also includes a main reducer housing, the half shaft is rotatably installed in the middle of the main reducer housing, the input shaft and the connecting shaft are rotatably installed inside the main reducer housing and are respectively located on both sides of the half shaft.

6. A two-speed reducer as claimed in claim 5, characterized in that: The motor and the power take-off are arranged outside the main reducer housing and are located on the inner side, and the wheel hub is arranged on the outer side of the main reducer housing.

7. A two-speed reducer according to claim 5 or 6, characterized in that: The input shaft, the connecting shaft and the half shaft are all rotatably mounted in the main reducer housing via bearings.

8. A two-speed reducer as claimed in claim 1, characterized in that: The input shaft is coaxially arranged with the output shaft of the motor and is connected via a spline.

9. A two-speed reducer as claimed in claim 1, characterized in that: The first gear driving gear, the first gear driven gear, the second gear driving gear, the second gear driven gear and the input gear are all cylindrical helical gears.

10. An electric drive axle transmission device, characterized in that: It comprises a bridge housing and two two-speed reducers as described in any one of claims 1 to 9, wherein the two two-speed reducers are respectively mounted at two ends of the bridge housing.

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