Range extender and vehicle

Abstract

The utility model provides a range extender and a vehicle, the range extender comprises: an engine, the engine is provided with a power output shaft, the power output shaft is provided with at least one driving tooth; a rotor of the generator is provided with a power input end, the power input end is provided with a connecting hole, at least one driven tooth is arranged in the connecting hole, the driving tooth extends to the connecting hole and is connected with the driven tooth in a matched mode, and the driving tooth is in clearance fit with the inner wall of the connecting hole; and the elastic piece is arranged at the matched connection part of the driving tooth and the driven tooth. According to the range extender, the elastic piece is arranged at the matched connection position of the driving gear and the driven gear, the elastic piece has the functions of vibration isolation and elastic decoupling, on one hand, the torsional vibration safety coefficient of the output shaft of the engine is improved, the output shaft is not prone to breakage, and on the other hand, the rotor of the motor rotates more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of power output, in particular to a range extender and a vehicle. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Currently, there are two main ways to connect the shaft of the range extender. One connection method uses an elastic coupling, and the other connection method uses a flange rigid connection.

[0004] The connection method using an elastic coupling has high reliability, but it cannot provide radial support, and the coupling body occupies a portion of the axial dimension, causing the axial dimension of the motor to be too long.

[0005] By using flange rigid connection, the axial dimension of the motor can be shortened appropriately. However, when the motor's moment of inertia is large, there is a risk of crankshaft torsional vibration fracture. At the same time, there is a problem of poor alignment between the crankshaft and the motor rotor. Axial movement can easily cause serious bearing wear and motor damage. Utility Model Content

[0006] The purpose of the utility model is to at least solve the technical problem that the axial connection of the range extender has an unreasonable structure and is prone to failure. This purpose is achieved through the following technical solutions:

[0007] The first aspect of the utility model provides a range extender, the range extender comprising:

[0008] An engine, wherein the engine has a power output shaft, and the power output shaft is provided with at least one driving tooth;

[0009] A generator, wherein the rotor of the generator has a power input end, the power input end is provided with a connecting hole, at least one driven tooth is provided in the connecting hole, the driving tooth extends to the connecting hole and is connected with the driven tooth, and the driving tooth is matched with the inner wall of the connecting hole with a clearance;

[0010] An elastic member is arranged at the matching connection between the driving tooth and the driven tooth.

[0011] In the range extender of the utility model, the power output shaft of the engine is connected with the driven teeth in the power input end connection hole of the rotor of the generator through the driving teeth, and an elastic member is arranged at the matching connection. The output torque of the engine is transmitted to the rotor of the generator through the elastic member to drive the rotor of the generator to rotate. The elastic member arranged at the matching connection between the driving teeth and the driven teeth plays the role of isolating vibration and elastic decoupling. On the one hand, the torsional vibration safety factor of the output shaft of the engine is improved, and the output shaft is not easy to break. On the other hand, the rotation of the rotor of the generator is more stable.

[0012] In addition, the range extender according to the utility model may also have the following additional technical features:

[0013] In some embodiments of the present invention, the rotor has a rotating shaft, which is arranged on the side of the power input end away from the engine, and a partial shaft section of the rotating shaft is provided with a bearing assembly, and along the axial direction of the rotating shaft, at least part of the bearing assembly is located in the middle area of ​​the rotor.

[0014] In some embodiments of the utility model, the bearing assembly includes a first bearing and a second bearing, the first bearing and the second bearing are arranged at intervals, the first bearing is located in the middle area, and the second bearing is located on the side of the first bearing away from the power input end; wherein the second bearing is in a floating state.

[0015] In some embodiments of the utility model, the generator also includes a rear end cover, on which a first connecting end and a second connecting end are protruded, and along the axial direction of the rotating shaft, the first connecting end is connected to the outer ring of the first bearing, and along the axial direction of the rotating shaft, the second connecting end is loosely matched with the outer ring of the second bearing.

[0016] In some embodiments of the utility model, the first connecting end is provided with a first annular groove, and the first annular groove is cooperatively connected with the outer ring of the first bearing; and / or,

[0017] The second connecting end is provided with a second annular groove, and a radial gap exists between the second annular groove and the outer ring of the second bearing.

[0018] In some embodiments of the utility model, the power output shaft is provided with a plurality of driving teeth, and the plurality of driving teeth are distributed along the circumferential direction on a partial shaft section of the power output shaft.

[0019] In some embodiments of the present invention, the active teeth include straight teeth, helical teeth or herringbone teeth.

[0020] In some embodiments of the utility model, a plurality of driving teeth are provided on the power output shaft and are distributed on the shaft end surface of the power output shaft.

[0021] In some embodiments of the present invention, the active tooth is inserted into the connecting hole in a detachable manner.

[0022] A second aspect of the utility model further provides a vehicle, characterized in that the vehicle comprises a range extender as described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 The schematic diagram schematically shows the structure of the power input side of the engine of the range extender according to the embodiment of the utility model;

[0025] Figure 2 The schematic diagram shows the connection relationship between the driving teeth of the range extender according to the embodiment of the utility model and the connecting hole, and also shows the bearing assembly on the rotor rotating shaft and the rear end cover;

[0026] Figure 3 The connection relationship between the first bearing and the second bearing of the range extender and the rear end cover according to the embodiment of the utility model is schematically shown in the form of a cross-sectional view;

[0027] Figure 4 The relative positional relationship between the various components of the power input end of the generator of the range extender according to the embodiment of the utility model is schematically shown in the form of a cross-sectional view, and the positional relationship between the rotating shaft, the bearing assembly and the rear end cover is also shown.

[0028] The reference numerals are as follows:

[0029] 111, power output shaft; 112, driving gear; 113, shaft end face;

[0030] 121, rotor; 1211, power input end; 122, connecting hole; 123, driven tooth; 124, axial clearance; 125, radial clearance; 126, rotating shaft; 127, first bearing; 128, second bearing; 1281, radial clearance; 1282, axial clearance;

[0031] 130. Elastic parts;

[0032] 140, rear end cover; 141, first connecting end; 1411, first annular groove; 142, second connecting end; 1421, second annular groove. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0036] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0037] The utility model provides a range extender, comprising an engine and a generator. The engine is provided with a power output shaft, and the power output shaft is provided with driving teeth for transmitting torque to a rotor in a generator connected to the engine to output power.

[0038] The rotor of the generator of the range extender has a power input end, and a connecting hole is arranged at the power input end of the rotor. A passive tooth is arranged in the connecting hole. When the active tooth of the engine extends into the connecting hole, it can cooperate with the passive tooth in the connecting hole to transmit the output power of the power output shaft of the engine to the rotor of the generator, so that the rotor of the generator rotates.

[0039] Among them, an elastomer is provided at the matching connection between the driving tooth extending into the connecting hole and the driven tooth. The elastomer is used for the driving tooth to transmit the rotational torque to the driven tooth through the elastomer when the power output shaft rotates. At the same time, when the elastomer is provided at the matching connection between the driving tooth and the driven tooth, an axial gap is provided between the driving tooth in the connecting hole and the rotor, and a radial gap is provided between the driving tooth in the connecting hole and the inner wall of the connecting hole, that is, the driving tooth of the power output shaft and the driven tooth in the connecting hole of the rotor are connected only by the elastomer, and there is no rigid connection between the power output shaft and the rotor.

[0040] Therefore, in the range extender of the utility model, the power output shaft of the engine and the rotor of the generator are connected by the driving teeth and the driven teeth. Compared with setting a coupling at the connection between the engine and the engine, the axial distance of the generator is shortened. The elastomer at the connection between the driving teeth and the driven teeth plays the role of transmitting torque and reducing vibration. The elastic decoupling between the power output shaft of the engine and the rotor of the engine can provide a torsional vibration safety factor for the power output shaft of the engine, and it is not easy to break while the output power shaft transmits torque. On the other hand, it can also make the rotation of the generator more stable and reduce the impact on the rotor.

[0041] The range extender of the utility model adopts an integrated motor structure design, and no coupling is used at the shaft connection between the engine and the engine, so as to reduce the disadvantage that the axial connection size of the engine and the generator is long due to the coupling, so that an additional support structure needs to be provided. By providing an integrated structure of driving teeth, driven teeth and elastomers, the connection structure of the engine and the generator is miniaturized and lightweight, and at the same time, the reliability of the connection is improved, the parts at the connection are reduced, and the maintenance cost during subsequent use is reduced.

[0042] The range extender of the utility model is also to realize elastic decoupling between the power output shaft of the engine and the rotor of the engine, and has high reliability, especially a radial gap is provided on the inner wall of the connecting hole between the driving tooth and the rotor, and an axial gap is provided between the driving tooth in the connecting hole and the rotor, so that there is a certain amount of activity between the engine, the power output shaft and the rotor in the radial and axial directions, and the adverse effect of the slight movement and deformation of the power output shaft or the driving tooth in the axial or radial direction of the engine on the rotor is reduced. At the same time, it can also reduce the adverse effect of the slight movement or deformation of the driven tooth in the connecting hole of the rotor or its power input end on the power output shaft of the engine. Therefore, the range extender of the utility model is highly integrated while ensuring the reliability of its connection.

[0043] The specific structure of the range extender of the present invention is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are only used to explain the specific embodiments of the range extender of the present invention and should not be understood as limiting the present invention.

[0044] Figure 1 The schematic diagram of the structure of the power input side of the engine of the range extender according to the embodiment of the utility model is shown schematically, as shown in FIG. Figure 1 As shown, a connecting hole 122 is provided on the power input side of the rotor 121 of the engine, and a driven tooth 123 for cooperating with the elastomer and the driving tooth 112 is provided in the connecting hole 122. The driven tooth 123 in this embodiment is provided in the connecting hole 122, and a plurality of driven teeth 123 can also be built in the connecting hole 122. The plurality of driven teeth 123 are evenly distributed in the connecting hole 122, and the plurality of driven teeth 123 are arranged at intervals, which is conducive to dispersing the driving torque among the plurality of driven teeth 123 in the connecting hole 122, so that the force on the rotor 121 is more uniform and the rotation is more stable.

[0045] like Figure 1As shown, a plurality of driving teeth 112 are arranged on the power output shaft 111 of the engine, and the plurality of driving teeth 112 are arranged on the shaft end surface 113 of the power output shaft 111. The plurality of driving teeth 112 are evenly distributed along the circumferential direction on the shaft end surface 113. The circumferential direction means that the plurality of driving teeth 112 are evenly distributed along the rotation direction of the power output shaft 111 with the intersection of the rotation axis 126 line of the power output shaft 111 and the shaft end surface 113 as the center; the plurality of driving teeth 112 cooperate with the driven teeth 123 in the connecting hole 122 through the elastic body, and evenly transmit the torque to the rotor 121, and the rotor 121 of the generator rotates relative to the stator.

[0046] The driving tooth 112 protrudes from the shaft end surface 113 , and the shape of the driving tooth 112 can be rectangular, tooth-shaped or stepped. A driven tooth 123 is arranged between two adjacent driving teeth 112 , and the driven tooth 123 and the driving tooth 112 are connected by an elastic body.

[0047] According to the power transmission mode between the power output shaft 111 and the rotor 121 , the driving teeth 112 and the driven teeth 123 can also be set as straight teeth, helical teeth or herringbone teeth.

[0048] In the range extender of this embodiment, the driving teeth 112 on the power output shaft 111 and the driven teeth 123 in the connecting hole 122 of the rotor 121 extend in the direction of the rotation axis 126 of the power output shaft 111. When the power output shaft 111 rotates, the driving teeth 112 and the driven teeth 123 are connected by the elastic member 130, and thus have a larger contact area.

[0049] In order to improve the connection strength between the multiple active teeth 112 on the power output shaft 111, the multiple active teeth 112 can be connected to each other to form an integral structure. The multiple active teeth 112 of the integral structure are also conducive to processing and molding, thereby improving the connection strength and rigidity. Figure 4 As shown, the multiple driving teeth 112 on the shaft end face 113 of the power output shaft 111 are connected to each other to form an integral structure. A plurality of elastic members 130 are provided to match the multiple driving teeth 112. Each elastic member 130 is provided between two adjacent driving teeth 112, wherein the elastic member 130 should also be in surface contact with the driven teeth 123 in the connecting hole 122 to transmit the torque output by the driving teeth 112.

[0050] Different from the above-mentioned embodiment, Figure 1 The multiple driving teeth 112 on the power output shaft 111 shown in FIG. 1 are arranged at intervals, and there is no contact between the multiple driving teeth 112. Figure 1It can also be seen that the elastomer is an integral structure, and a plurality of receiving grooves are provided on the elastic member 130, wherein a part of the receiving grooves is used to receive the active teeth 112, and another part of the receiving grooves is used to receive the driven teeth 123, and there is a partial area of ​​the elastic member 130 between adjacent active teeth 112 and driven teeth 123 for transmitting torque.

[0051] According to an arrangement method on the power output shaft 111 of the range extender of the utility model, multiple driving teeth 112 can also be set on a partial shaft section of the power output shaft 111, and are evenly distributed in the circumferential direction of the partial shaft section. The above-mentioned structural form is not shown in the figure. As an optional implementation method, the multiple driving teeth 112 are evenly arranged on the partial shaft section of the power output shaft 111, which can improve the overall connection strength and rigidity between the power output shaft 111 and the multiple driving teeth 112, and is also conducive to processing multiple driving teeth 112 on the power output shaft 111.

[0052] Part of the shaft section of the power output shaft 111 can also be processed into a spline type, and the protruding structure of the spline type is used as the active tooth 112 for transmitting torque, wherein the structure of the active tooth 112 can be a straight tooth, a helical tooth or a herringbone tooth structure.

[0053] from Figure 1 It can also be seen that the driving tooth 112 on the power output shaft 111 is arranged in the connecting hole 122 of the engine in a plug-in manner, and the driving tooth 112 is detachably connected to the driven tooth 123 in the connecting hole 122 of the rotor 121, and the driving tooth 112 is connected to the driven tooth 123 through the elastic member 130.

[0054] The plug-in structure connection method is conducive to adjusting the positional relationship between the power output shaft 111 of the engine and the rotor 121 of the generator, and is also conducive to adjusting the axial gap 124 between the driving tooth 112 and the rotor 121 according to actual needs.

[0055] Figure 2 The schematic diagram shows the connection relationship between the driving tooth 112 of the range extender according to the embodiment of the utility model and the connecting hole 122, and also shows the bearing assembly on the rotating shaft 126 of the rotor 121 and the rear end cover 140, as shown in FIG. Figure 2 As shown, when the driving tooth 112 on the power output shaft 111 of the engine extends into the connecting hole 122 of the generator rotor 121, an axial gap 124 is provided between the driving tooth 112 and the rotor 121, and a radial gap 125 is provided between the driving tooth 112 and the inner wall of the connecting hole 122. By providing the axial gap 124 and the radial gap 125, the driving tooth 112 of the power output shaft 111 and the driven tooth 123 of the rotor 121 can be connected only by the elastic body.

[0056] The range extender of this embodiment can achieve elastic decoupling between the power output shaft 111 of the engine and the rotor 121 of the generator. At the same time, there is a certain amount of mobility between the power output shaft 111 and the rotor 121 of the generator, thereby avoiding rigid contact between the power output shaft 111 and the rotor 121 when operating in different working conditions, thereby reducing damage to components therein due to mutual influence between the engines.

[0057] from Figure 2 It can also be seen that the bearing assembly on the rotating shaft 126 of the generator away from the power input end 1211, wherein the second bearing 128 away from the power input end 1211 is fitted with a clearance between the rear end cover 140 of the generator, and an axial clearance 124 and a radial clearance 125 are provided between the second bearing 128 and the second connecting end 142 of the rear end cover 140.

[0058] When the rotor 121 of the generator rotates under a certain working condition, the second bearing 128 on the rotating shaft 126 is in a floating state, and the rotating shaft 126 has a certain amount of mobility on the side of the power input end 1211 away from the rotor 121, which can not only meet the axial deformation and radial deformation caused by thermal expansion and contraction, but also meet the small axial and radial displacements caused by the adjustment of the relative position relationship.

[0059] The range extender in this embodiment is provided with a first bearing 127 and a second bearing 128 on the rotating shaft 126 of the rotor 121 of the generator. The first bearing 127 and the second bearing 128 are located on the same side of the rotor 121. The first bearing 127 and the second bearing 128 are arranged at an interval, which is beneficial to improving the axial positioning of the rotor 121 of the generator and has a higher coaxiality.

[0060] The first bearing 127 may be disposed in the middle region of the rotor 121 along the axial direction of the rotating shaft 126 , so that the rotor 121 has higher stability when rotating.

[0061] It should be noted that, in the range extender of this embodiment, the inner ring of the first bearing 127 on the rotating shaft 126 of the generator is fixedly connected to the rotating shaft 126, one side of the inner ring of the first bearing 127 abuts against a shoulder of the rotating shaft 126, and the outer ring of the first bearing 127 abuts against the first connecting end 141 of the rear end cover 140, thereby fixing the inner ring and the outer ring of the first bearing 127 to support the rotating shaft 126.

[0062] The inner ring of the second bearing 128 is fixedly connected to the rotating shaft 126, and one side of the inner ring of the second bearing 128 is connected to a shoulder of the rotating shaft 126. The outer ring of the second bearing 128 and the second connecting end 142 between the rear end cover 140 are clearance-fitted, so that the second bearing 128 has a certain amount of activity in both the axial and radial directions.

[0063] The first bearing 127 and the second bearing 128 may be fixedly connected to the rotating shaft 126 by interference fit, and the interference fit is arranged according to the shaft diameter, the frequency of bearing disassembly, the load size and the overall structure of the generator.

[0064] In the range extender of this embodiment, the second bearing 128 is in a floating state. Even if the rotor 121 has a certain displacement in the radial direction or the axial direction, it can still ensure that the rotor 121 is stably connected between the power input end 1211 and the power output shaft 111; the rotor 121 has a high coaxiality as a whole, and the rotor 121 has a high stability during rotation.

[0065] Figure 3 The connection relationship between the first bearing 127 and the second bearing 128 of the range extender and the rear end cover 140 according to the embodiment of the utility model is schematically shown in the form of a stereogram. Figure 3 As shown, a rotating shaft 126 is arranged on the side of the rotor 121 of the generator away from the power input end 1211, and a first bearing 127 and a second bearing 128 are arranged on the rotating shaft 126. The first bearing 127 and the second shaft are located on the same side of the rotor 121 and are arranged at intervals. The rotor 121 is supported by double bearings, which improves the stability of the rotor 121.

[0066] In the range extender of this embodiment, the first bearing 127 is in contact with the first connecting end 141 of the rear end cover 140 of the generator, and the second bearing 128 is clearance-matched with the second connecting end 142 of the rear end cover 140, wherein a first annular groove 1411 is provided at the first connecting end 141 of the rear end cover 140, and the first annular groove 1411 is connected to the outer ring of the first bearing 127, and a second annular groove 1421 is provided at the second connecting end 142 of the rear end cover 140, and the second annular groove 1421 is clearance-matched with the outer ring of the second bearing 128, respectively having an axial gap 1282 and a radial gap 1281, so that the second bearing 128 can be in a floating state.

[0067] A second bearing 128 in a floating state is arranged on a partial shaft section of the rotating shaft 126 away from the power input end 1211. When the rotating shaft 126 produces a slight movement in the radial or axial direction, the rotor 121 can still rotate stably, wherein the slight movement may be deformation caused by thermal expansion of the rotating shaft 126 or the second bearing 128, or a slight movement caused by the rotor 121 during rotation or connection between the power input side and the power output shaft 111 of the engine.

[0068] Therefore, the range extender of this embodiment, by providing the second bearing 128 in a floating state, can absorb and automatically and adaptively adjust the tiny movement of components generated during the operation of the generator, thereby avoiding the abnormal operation caused by the mutual compression between components in the generator.

[0069] from Figure 3 It can also be seen that a connecting hole 122 is provided on the power input side of the generator rotor 121, and a plurality of driven teeth 123 are provided in the connecting hole 122, which are used to cooperate with the driving teeth 112 and the elastic member 130 on the power output shaft 111 of the engine to transmit torque and drive the rotor 121 to rotate.

[0070] Figure 4 The relative positional relationship between the various components of the power input end 1211 of the generator of the range extender according to the embodiment of the present utility model is schematically shown in the form of a cross-sectional view, and the positional relationship between the rotating shaft 126 and the bearing assembly and the rear end cover 140 is also shown. Figure 4 As shown, on one side of the power input end 1211 of the generator, the driving teeth 112 on the power output shaft 111 of the engine are inserted into the connecting hole 122, and a plurality of elastic bodies are respectively arranged between the plurality of driving teeth 112. The plurality of driving teeth 112 cooperate with the driven teeth 123 in the connecting hole 122 through the plurality of elastic bodies to transmit torque.

[0071] On the side away from the power input end 1211 of the generator, a rotating shaft 126 is arranged on the rotor 121, and the first bearing 127 and the second bearing 128 on the rotating shaft 126 support the rotor 121. The first bearing 127 and the second bearing 128 are both connected through the rear end cover 140 of the generator, wherein the first bearing 127 is located in the middle area of ​​the rotor 121 along the axial direction of the rotating shaft 126, and is used to maintain the rotor 121 with high stability, and the second bearing 128 is close to the rear end cover 140 and is matched with the rear end cover 140 with a clearance, and is used to adaptively adjust the slight deformation or slight movement of the components in the engine.

[0072] In summary, the range extender of the utility model provides different connection methods between the engine and the generator through the above-mentioned different embodiments, wherein the power output shaft 111 of the engine and the rotor 121 of the generator are connected in a plug-in manner, which has the advantage of high integration, and an elastomer is provided at the connection for transmitting torque, so that the power output shaft 111 and the rotor 121 are elastically decoupled, which can avoid shaft breakage and damage to other components caused by poor alignment between the power output shaft 111 and the rotor 121.

[0073] The engine of the range extender of the utility model is provided with a first bearing 127 and a second bearing 128 for support on the same side, and the second bearing 128 is clearance-matched with the rear end cover 140 to avoid slight deformation caused by thermal expansion inside the generator, or extrusion caused by slight movement of components at various connections.

[0074] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A range extender, characterized in that: The range extender comprises: An engine, wherein the engine has a power output shaft, and the power output shaft is provided with at least one driving tooth; A generator, wherein the rotor of the generator has a power input end, the power input end is provided with a connecting hole, at least one driven tooth is provided in the connecting hole, the driving tooth extends to the connecting hole and is connected with the driven tooth, and the driving tooth is matched with the inner wall of the connecting hole with a clearance; An elastic member, the elastic member being arranged at a matching connection between the driving tooth and the driven tooth; The rotor has a rotating shaft, which is arranged on a side of the power input end away from the engine, and a bearing assembly is arranged on a portion of the shaft section of the rotating shaft, and along the axial direction of the rotating shaft, at least a portion of the bearing assembly is located in the middle area of ​​the rotor; The bearing assembly comprises a first bearing and a second bearing, the first bearing and the second bearing are spaced apart, the first bearing is located in the middle area, and the second bearing is located on a side of the first bearing away from the power input end; Wherein, the second bearing is in a floating state.

2. The range extender according to claim 1, characterized in that: The generator also includes a rear end cover, on which a first connecting end and a second connecting end are protruded. Along the axial direction of the rotating shaft, the first connecting end is connected to the outer ring of the first bearing, and along the axial direction of the rotating shaft, the second connecting end is loosely matched with the outer ring of the second bearing.

3. The range extender according to claim 2, characterized in that: The first connecting end is provided with a first annular groove, and the first annular groove is cooperatively connected with the outer ring of the first bearing; and / or, The second connecting end is provided with a second annular groove, and a radial gap exists between the second annular groove and the outer ring of the second bearing.

4. The range extender according to any one of claims 1 to 3, characterized in that: The power output shaft is provided with a plurality of driving teeth, and the plurality of driving teeth are distributed along the circumferential direction on a partial shaft section of the power output shaft.

5. The range extender according to claim 4, characterized in that: The active teeth include straight teeth, helical teeth or herringbone teeth.

6. The range extender according to any one of claims 1 to 3, characterized in that: The power output shaft is provided with a plurality of driving teeth, and the plurality of driving teeth are distributed on the shaft end surface of the power output shaft.

7. The range extender according to any one of claims 1 to 3, characterized in that: The active tooth is inserted into the connecting hole in a detachable manner.

8. A vehicle, characterized in that: The vehicle comprises the range extender according to any one of claims 1-7.

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