Double-motor input two-gear gearbox

Abstract

A double-motor input two-gear gearbox comprises a first motor, a second motor, an input shaft assembly connected with the first motor and the second motor, intermediate shaft two-gear transmission assemblies connected with the input shaft assembly, and a power takeoff assembly connected with one intermediate shaft two-gear transmission assembly. The power take-off device is characterized in that the input shaft assembly, the intermediate shaft two-gear transmission assemblies and the power take-off assembly are parallel and are arranged in multiple layers from inside to outside, the front output shaft assembly is arranged between the two intermediate shaft two-gear transmission assemblies in parallel, and the front output shaft assembly is connected with the two intermediate shaft two-gear transmission assemblies in a meshed mode. The front end of the front output shaft assembly is coaxially connected with a planet wheel speed reduction assembly. According to the utility model, the space utilization rate of assembly of each component is improved, the structural compactness is improved, high-torque and low-rotating-speed power output is realized, and the size and weight of the gearbox are reduced, so that the requirement of high-torque transmission is met, and the stability of the input shaft is improved.

Description

Technical Field

[0001] The utility model relates to a two-speed gearbox with dual motor inputs, which belongs to the technical field of new energy vehicle gearboxes. Background Art

[0002] The gearbox is one of the core transmission components of the vehicle, mainly used to change the speed and torque from the engine, and can change the transmission ratio of the output shaft and the input shaft in a fixed or divided manner. At present, in the field of new energy commercial vehicle gearboxes, there are "single motor + dual intermediate shaft transmission structure" or "dual motor + dual intermediate shaft transmission structure". The gearboxes with these transmission structures have the following problems in the field of commercial vehicles:

[0003] 1. In order to achieve high torque and low speed output conditions, a large-volume reduction gearbox with a high reduction ratio is matched with a low-speed motor, resulting in a large size and heavy weight of the dual-motor gearbox product.

[0004] 2. As the power of the motor increases, the input shaft bearing needs to withstand greater loads and speeds, and the stability of the input shaft is poor. Utility Model Content

[0005] The two-speed gearbox with dual motor input provided by the utility model improves the space utilization rate of the assembly of various components, improves the compactness of the structure, utilizes the characteristics of the small size and large speed ratio of the planetary gear system, realizes high-torque and low-speed power output, reduces the size and weight of the gearbox to meet the requirements of high torque transmission, and improves the stability of the input shaft.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A two-speed gearbox with dual motor inputs comprises motor one, motor two, an input shaft assembly connected to motor one and motor two respectively, an intermediate shaft two-speed transmission assembly connected to the input shaft assembly respectively, and a power take-off assembly connected to one of the intermediate shaft two-speed transmission assemblies, characterized in that: the input shaft assembly, the intermediate shaft two-speed transmission assembly and the power take-off assembly are parallel and arranged in multiple layers from the inside to the outside, a front output shaft assembly is arranged in parallel between the two groups of intermediate shaft two-speed transmission assemblies, the front output shaft assembly is meshed and connected to the two groups of intermediate shaft two-speed transmission assemblies respectively, and the front end of the front output shaft assembly is coaxially connected to a planetary gear reduction assembly.

[0008] Preferably, the input shaft assembly includes an input shaft connected to motor one or motor two, an input stage driving gear assembled on the input shaft, and a support bearing group pressed onto the gearbox housing and assembled with the input shaft, the support bearing group includes a cylindrical roller bearing and a deep groove ball bearing, and the cylindrical roller bearings are arranged on both sides of the input stage driving gear, and the deep groove ball bearing is arranged on the front side of the cylindrical roller bearing.

[0009] Preferably, the intermediate shaft two-speed transmission assembly includes an intermediate shaft supported in a gearbox housing through a tapered roller bearing, an input-stage driven gear assembled on the intermediate shaft and meshingly connected with the input-stage driving gear, a second-speed driving gear rotatably mounted on the intermediate shaft through a needle bearing, a first-speed driving gear rotatably mounted on the intermediate shaft through a needle bearing, a first- and second-speed combining gear fixed on the intermediate shaft, a combining gear sleeve meshing on the first- and second-speed combining gear, the first- and second-speed combining gear and the combining gear sleeve are located between the first- and second-speed driving gear and the second-speed driving gear, the combining gear sleeve moves to the left on the first- and second-speed combining gear to combine with the second-speed driving gear, and moves to the right on the first- and second-speed combining gear to combine with the first-speed driving gear.

[0010] Preferably, the front output shaft assembly includes a front output shaft supported in the gearbox housing by a tapered roller bearing and arranged in parallel between the two intermediate shafts, a second gear driven gear assembled on the front output shaft and meshingly connected with the second gear driving gear, and a first gear driven gear assembled on the front output shaft and meshingly connected with the first gear driving gear.

[0011] Preferably, the planetary gear reduction assembly includes a sun gear coaxially fixed with the front end of the front output shaft, a planetary gear meshing with the sun gear, a planetary carrier connected to the planetary gear, and a ring gear fixed in the transmission housing and meshing with the planetary gear, and the output shaft of the planetary carrier is supported on the transmission housing through a tapered roller bearing.

[0012] Preferably, the power take-off assembly includes a power take-off shaft supported in the gearbox housing through a deep groove ball bearing, a power take-off gear assembled on the power take-off shaft and meshingly connected to an input stage driven gear in a two-speed transmission assembly of an intermediate shaft, and a power take-off connected to the power take-off shaft.

[0013] The beneficial effects of the utility model are:

[0014] 1. In the two-speed gearbox with dual motor input of the utility model, the input shaft assembly, the intermediate shaft two-speed transmission assembly and the power take-off assembly are arranged in parallel and in multiple layers from the inside to the outside, and the front output shaft assembly is arranged in parallel between the two sets of intermediate shaft two-speed transmission assemblies. The multiple layers arranged from the inside to the outside reduce the axial space, improve the space utilization rate of the assembly of each assembly, and improve the compactness of the structure. The front end of the front output shaft assembly is coaxially connected to the planetary gear reduction assembly. The characteristics of the planetary gear system with small volume and large speed ratio are utilized to achieve high torque and low speed power output, reduce the deceleration requirements of the input shaft assembly and the intermediate shaft two-speed transmission assembly, reduce the gear diameters in the input shaft assembly and the intermediate shaft two-speed transmission assembly, and reduce the volume and weight of the gearbox.

[0015] 2. Cylindrical roller bearings and deep groove ball bearings are assembled on the input shaft of the input shaft assembly. The cylindrical roller bearings are arranged on both sides of the input stage driving gear, and the deep groove ball bearings are arranged in front of the cylindrical roller bearings. The input shaft is effectively supported by the cylindrical roller bearings and the deep groove ball bearings to improve the radial and axial load-bearing capacity of the input shaft to meet the requirements of high torque transmission and improve the stability of the input shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a two-speed gearbox with dual motor input in a specific implementation manner.

[0017] Figure 2 Another schematic of a two-speed gearbox feeding dual electric motors. DETAILED DESCRIPTION

[0018] Combine the following Figure 1~2 The embodiments of the utility model are described in detail.

[0019] A two-speed gearbox with dual motor inputs comprises a motor 1, a motor 2, an input shaft assembly 3 connected to the motor 1 and the motor 2, respectively, an intermediate shaft two-speed transmission assembly 4 connected to the input shaft assembly 3, and a power take-off assembly 7 connected to one of the intermediate shaft two-speed transmission assemblies 4, characterized in that the input shaft assembly 3, the intermediate shaft two-speed transmission assembly 4 and the power take-off assembly 7 are parallel and arranged in multiple layers from the inside to the outside, a front output shaft assembly 5 is arranged in parallel between the two groups of intermediate shaft two-speed transmission assemblies 4, the front output shaft assembly 5 is meshed and connected to the two groups of intermediate shaft two-speed transmission assemblies 4, and the front end of the front output shaft assembly 5 is coaxially connected to a planetary gear reduction assembly 6.

[0020] The two-speed gearbox with dual motor input described above includes two groups of input shaft assemblies 3, two groups of intermediate shaft two-speed transmission assemblies 4 and one group of power take-off assembly 7. The input shaft assembly 3, the intermediate shaft two-speed transmission assembly 4 and the power take-off assembly 7 are parallel and arranged in multiple layers from the inside to the outside. The front output shaft assembly 5 is arranged in parallel between the two groups of intermediate shaft two-speed transmission assemblies 4. The multiple layers arranged from the inside to the outside reduce the axial space, improve the space utilization rate of the assembly of each component, and improve the compactness of the structure. The front end of the front output shaft assembly 5 is coaxially connected to the planetary gear reduction assembly 6. The characteristics of the planetary gear system with small volume and large speed ratio are utilized to achieve high torque and low speed power output, reduce the deceleration burden of the input shaft assembly 3 and the intermediate shaft two-speed transmission assembly 4, reduce the gear diameter in the input shaft assembly 3 and the intermediate shaft two-speed transmission assembly 4, and reduce the volume and weight of the gearbox.

[0021] The input shaft assembly 3 includes an input shaft 31 connected to the motor 1 or the motor 2, an input stage driving gear 32 assembled on the input shaft 31, and a support bearing group pressed on the gearbox housing and assembled with the input shaft 31, wherein the support bearing group includes a cylindrical roller bearing 33 and a deep groove ball bearing 34, and the cylindrical roller bearing 33 is arranged on both sides of the input stage driving gear 32, and the deep groove ball bearing 34 is arranged in front of the cylindrical roller bearing 33. The cylindrical roller bearing 33 and the deep groove ball bearing 34 are assembled on the input shaft 31, and the cylindrical roller bearing 33 is arranged on both sides of the input stage driving gear 32, and the deep groove ball bearing 34 is arranged in front of the cylindrical roller bearing 33. The input shaft 31 is effectively supported by the cylindrical roller bearing 33 and the deep groove ball bearing 34, so as to improve the radial and axial load-bearing capacity of the input shaft, so as to meet the requirements of high torque transmission and improve the stability of the input shaft 31.

[0022] The intermediate shaft two-speed transmission assembly 4 includes an intermediate shaft 41 supported in a gearbox housing through a tapered roller bearing, an input-stage driven gear 42 mounted on the intermediate shaft 41 and meshingly connected with the input-stage driving gear 32, a second-speed driving gear 43 rotatably mounted on the intermediate shaft 41 through a needle bearing, a first-speed driving gear 44 rotatably mounted on the intermediate shaft 41 through a needle bearing, a first- and second-speed combining gear 45 fixed on the intermediate shaft 41, and a combining gear sleeve 46 meshingly sleeved on the first- and second-speed combining gear 45. The first- and second-speed combining gear 45 and the combining gear sleeve 46 are located between the first- and second-speed driving gear 44 and the second-speed driving gear 43. The combining gear sleeve 46 moves leftward on the first- and second-speed combining gear 45 to be combined with the second-speed driving gear 43, and moves rightward on the first- and second-speed combining gear 45 to be combined with the first-speed driving gear 44. The input stage driving gear 32 drives the input stage driven gear 42 to rotate synchronously, so that the intermediate shaft 41 rotates, and the first and second gear combining gear 45 rotates synchronously with the intermediate shaft 41. When the combining gear sleeve 46 is located between the first gear driving gear 44 and the second gear driving gear 43, it is a neutral gear, and the first gear driving gear 44 and the second gear driving gear 43 will not rotate. When the controller of the gearbox controls the combining gear sleeve 46 to move rightward on the first and second gear combining gear 45 to combine with the first gear driving gear 44, the first gear driving gear 44 rotates synchronously with the intermediate shaft 41 to transmit power to the front output shaft assembly 5. At this time, it is the first gear. When the controller of the gearbox controls the combining gear sleeve 46 to move leftward on the first and second gear combining gear 45 to combine with the second gear driving gear 43, the second gear driving gear 43 rotates synchronously with the intermediate shaft 41 to transmit power to the front output shaft assembly 5. At this time, it is the second gear.

[0023] The front output shaft assembly 5 includes a front output shaft 51 supported in the gearbox housing by a tapered roller bearing and arranged in parallel between the two intermediate shafts 41, a second gear driven gear 52 assembled on the front output shaft 51 and meshingly connected with the second gear driving gear 43, and a first gear driven gear 53 assembled on the front output shaft 51 and meshingly connected with the first gear driving gear 44. When the second gear driving gear 43 rotates, the second gear driven gear 52 is driven to rotate so that the front output shaft 51 rotates synchronously, thereby driving the planetary gear reduction assembly 6 to move, and when the first gear driving gear 44 rotates, the first gear driven gear 53 is driven to rotate synchronously, thereby driving the planetary gear reduction assembly 6 to move.

[0024] The planetary gear reduction assembly 6 includes a sun gear 61 coaxially fixed to the front end of the front output shaft 51, a planetary gear 62 meshing with the sun gear 61, a planetary carrier 63 connected to the planetary gear 62, and a ring gear 64 fixed in the transmission housing and meshing with the planetary gear 62. The output shaft of the planetary carrier 63 is supported on the transmission housing through a tapered roller bearing. The front output shaft 51 drives the sun gear 61 to rotate synchronously, and the sun gear 61 drives the planetary gear 62 to move on the ring gear 64, so that the planetary carrier 63 rotates to output power. The reduction structure of the planetary gear system has a small volume and a large speed ratio, and realizes high torque and low speed power output, reduces the reduction requirements of the input shaft assembly and the intermediate shaft two-speed transmission assembly, reduces the gear diameter in the input shaft assembly 3 and the intermediate shaft two-speed transmission assembly 4, and reduces the volume and weight of the gearbox.

[0025] The power take-off assembly 7 includes a power take-off shaft 71 supported in the gearbox housing by a deep groove ball bearing, a power take-off gear 72 assembled on the power take-off shaft 71 and meshingly connected with an input-stage driven gear 42 in a set of intermediate shaft two-speed transmission assembly 4, and a power take-off 73 connected to the power take-off shaft 71. The input-stage driven gear 42 drives the power take-off gear 72 to rotate synchronously, so that the power take-off shaft 71 rotates to transmit power to the power take-off 73, and the power take-off 73 outputs the power to an external working device, thereby forming a transmission to the external working device.

[0026] In the above-mentioned two-speed gearbox with dual motor input, when the neutral gear is engaged with the first gear, the combined gear sleeves 46 in the two intermediate shaft two-speed transmission components are all moved to the right to be combined with the first gear driving gear 44; the power of the motor is transmitted to the front output shaft 51 via the input shaft 31, the input stage driving gear 32, the input stage driven gear 32, the intermediate shaft 41, the first and second gear combined gear 45, the combined gear sleeve 46, the first gear driving gear 44, and the first gear driven gear 53, and the power of the motor 1 and the motor 2 are combined at the front output shaft 51, and are output from the output shaft of the planetary carrier 63 via the sun gear 61, the planetary gear 62 and the planetary carrier 63, so as to realize the dual motor input and combined output power; for example, the combined gear sleeve 46 in the two-speed transmission component 4 of the intermediate shaft connected to the motor 1 is moved to the left to disconnect it from the first gear driving gear 44, and at this time, the front output shaft 51 is only driven by the motor 1. The second gear driven gear 52 is driven by the motor 2, and the front output shaft 51 drives the second gear driven gear 52 to rotate, and the second gear driven gear 52 drives the second gear driving gear 43 in the intermediate shaft two-speed transmission assembly 4 connected to the motor 1 to rotate. Therefore, the speed of the second gear driving gear 43 in the intermediate shaft two-speed transmission assembly 4 connected to the motor 1 can be adjusted by the motor 2 2, and the speed of the first and second gear combined gear 45 in the intermediate shaft two-speed transmission assembly 4 connected to the motor 1 can be adjusted by the motor 1, so that the speed of the second gear driving gear 43 in the intermediate shaft two-speed transmission assembly connected to the motor 1 is the same as the first and second gear combined gear 45, and then the combined sleeve gear 46 on the first and second gear combined gear 45 is combined with the second gear driving gear 43, so that the motor 1 outputs the second gear power to the front output shaft 51, and the motor 2 2 outputs the first gear power to the output shaft 51, so that the power is not interrupted during the gear shifting process.

[0027] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. A two-speed gearbox with dual motor input, comprising a motor 1, a motor 2, an input shaft assembly connected to the motor 1 and the motor 2 respectively, an intermediate shaft two-speed transmission assembly connected to the input shaft assembly respectively, and a power take-off assembly connected to one set of the intermediate shaft two-speed transmission assemblies, characterized in that: The input shaft assembly, the intermediate shaft two-speed transmission assembly and the power take-off assembly are arranged in parallel and in multiple layers from the inside to the outside. The front output shaft assembly is arranged in parallel between the two sets of intermediate shaft two-speed transmission assemblies. The front output shaft assembly is respectively meshed and connected with the two sets of intermediate shaft two-speed transmission assemblies. The front end of the front output shaft assembly is coaxially connected to the planetary gear reduction assembly.

2. The two-speed gearbox with dual motor input according to claim 1, characterized in that: The input shaft assembly includes an input shaft connected to motor one or motor two, an input stage driving gear assembled on the input shaft, and a support bearing group pressed onto the gearbox housing and assembled with the input shaft. The support bearing group includes a cylindrical roller bearing and a deep groove ball bearing, and the cylindrical roller bearings are arranged on both sides of the input stage driving gear, and the deep groove ball bearing is arranged on the front side of the cylindrical roller bearing.

3. The two-speed gearbox with dual motor input according to claim 2, characterized in that: The intermediate shaft two-speed transmission assembly comprises an intermediate shaft supported in a transmission case by a tapered roller bearing, an input-stage driven gear mounted on the intermediate shaft and meshingly connected with the input-stage driving gear, a second-speed driving gear rotatably mounted on the intermediate shaft by a needle bearing, a first-speed driving gear rotatably mounted on the intermediate shaft by a needle bearing, a first- and second-speed combining gear fixed on the intermediate shaft, a combining gear sleeve meshingly sleeved on the first- and second-speed combining gear, the first- and second-speed combining gear and the combining gear sleeve being located between the first- and second-speed driving gear and the second-speed driving gear, the combining gear sleeve moving leftward on the first- and second-speed combining gear to combine with the second-speed driving gear, and moving rightward on the first- and second-speed combining gear to combine with the first-speed driving gear.

4. The two-speed gearbox with dual motor input according to claim 3, characterized in that: The front output shaft assembly includes a front output shaft supported in the transmission housing by a tapered roller bearing and arranged in parallel between the two intermediate shafts, a second gear driven gear assembled on the front output shaft and meshingly connected with the second gear driving gear, and a first gear driven gear assembled on the front output shaft and meshingly connected with the first gear driving gear.

5. The two-speed gearbox with dual motor input according to claim 4, characterized in that: The planetary gear reduction assembly includes a sun gear coaxially fixed to the front end of the front output shaft, a planetary gear meshing with the sun gear, a planetary carrier connected to the planetary gear, and a ring gear fixed in the transmission housing and meshing with the planetary gear. The output shaft of the planetary carrier is supported on the transmission housing through a tapered roller bearing.

6. The two-speed gearbox with dual motor input according to claim 2, characterized in that: The power take-off assembly includes a power take-off shaft supported in a gearbox housing through a deep groove ball bearing, a power take-off gear assembled on the power take-off shaft and meshingly connected to an input stage driven gear in a two-speed transmission assembly of an intermediate shaft, and a power take-off connected to the power take-off shaft.

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