Arrangement structure of power system on whole vehicle

Abstract

Provided is an arrangement structure of a power system on a whole vehicle. The power system comprises a motor (30) and a transmission box (21); the power system is longitudinally arranged; a shaft (17) of the motor (30) is arranged in the front-back direction of the whole vehicle; the transmission box (21) is correspondingly arranged in the front-back direction and connected to the back of the motor (30); a transmission shaft (7) of the transmission box (21) is connected to a driving sprocket for horizontal and transverse output; and the whole transverse size of the transmission box (21) and the driving sprocket (28) are also controlled within the diameter range of the motor (30). Compared with transverse arrangement, the transverse space occupied by the power system can be effectively reduced, and the transmission box (21) extends towards one side from the middle in the width direction of the vehicle, and compared with the transverse arrangement, the transmission box (21) extends outwards from one end of the motor (30), so that the possibility of the transmission box (21) transversely protruding out of the vehicle can be effectively reduced. The transmission box (21) is prevented from protruding, so that the riding comfort and the appearance of the whole vehicle can be improved. Especially for the current situation in which the axial size of a motor is generally larger than the radial size, a power system is longitudinally arranged, more significantly saving the transverse space.

Description

A layout structure of a power system on a whole vehicle Technical Field

[0001] The utility model belongs to the technical field of vehicle power systems, and in particular relates to an arrangement structure of a power system on a whole vehicle. Background Art

[0002] The power system of an electric motorcycle mainly includes an electric motor and a transmission box. The layout of the power system on the vehicle is mainly divided into two types: mid-mounted and rear-mounted. The mid-mounted power system is placed in the lower middle part of the frame, and the rear-mounted power system is placed on the side of the rear wheel. The mid-mounted power system can make the center of gravity of the vehicle closer to the middle of the vehicle, and the force of the front and rear shock absorbers is more balanced. It also has better controllability when the driving speed is higher. Therefore, the power systems of most electric motorcycles are currently mid-mounted.

[0003] At present, on electric motorcycles with a built-in power system, the motor of the power system is generally arranged along the width (lateral) direction of the vehicle. For example, Chinese patent CN213511940U discloses a power transmission structure of an electric motorcycle, in which a transmission box is connected to one end of the motor shaft extending from the motor, and the motor shaft extends into the transmission box and is transmission-connected to the transmission shaft inside the transmission box. The output shaft of the transmission box is arranged along the width of the vehicle and is connected to a driving sprocket. The driving sprocket and the driven sprocket at the rear wheel shaft end are chain-driven by a chain. The motor is arranged horizontally and the transmission box is connected to one end of the motor. As a result, the power system occupies a large amount of lateral space and the transmission box easily protrudes laterally from the vehicle, which easily affects driving operation, riding comfort and the appearance of the vehicle.

[0004] Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a layout structure of a power system on a whole vehicle, so as to solve the technical problem that the current mid-mounted power system occupies a large amount of lateral space and achieve the effect of reducing the lateral space occupied.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A layout structure of a power system on a whole vehicle includes a power system, which includes a motor and a transmission box. The motor is arranged at a lower position in the middle of the frame, and the motor shaft of the motor faces rearward and is arranged along the length of the vehicle. The transmission box is connected to the rear of the motor. The transmission shaft of the transmission box is perpendicular to the motor shaft and is arranged along the width of the vehicle. The motor shaft extends into the transmission box and is connected to one end of the transmission shaft. The other end of the transmission shaft extends out of the transmission box and is connected to a driving sprocket. The driving sprocket is connected to the rear wheel axle chain transmission. The transmission box and the driving sprocket are both located within the range of the motor in the width direction.

[0008] Furthermore, the motor is located behind the vehicle controller on the vehicle frame, and the wiring terminals of the motor are located on the front side of the motor so as to be connected to the vehicle controller.

[0009] Furthermore, the motor is lower than the vehicle controller to dissipate heat in the wind. The motor housing is cylindrical in shape and has a plurality of circumferentially evenly distributed cooling fins on the outer circumferential side. The cooling fins extend along the axial direction of the motor.

[0010] Furthermore, the frame is a double cradle frame and includes two cradle frames arranged at intervals along the width direction of the vehicle. The motor is located on the inner side of the cradle frame and abuts against the bottom. The forward side of the motor is fixedly connected to the two cradle frames respectively, and the vehicle controller is located between the two cradle frames and fixedly connected.

[0011] Furthermore, the motor shaft and the transmission shaft are respectively provided with hyperbola gears which are meshed with each other so as to achieve transmission connection between the motor shaft and the transmission shaft.

[0012] Furthermore, a flat fork is provided at the rear of the frame, the front end of the flat fork is rotatably connected to the frame through a flat fork shaft arranged along the width direction of the vehicle, and the rear wheel axle is arranged at the rear end of the flat fork along the width direction of the vehicle; the transmission box is located on the inner side of the flat fork, and the transmission shaft is coaxial with the flat fork shaft.

[0013] Furthermore, the motor includes a motor housing, and the transmission box includes a transmission box housing. The side of the motor housing connected to the transmission box housing is an output end face, and the side of the transmission box housing connected to the motor housing is an input end face. The output end face and the input end face are respectively penetrated by an output port and an input port. The motor shaft extends into the transmission box housing through the output port and the input port and is transmission-connected to the transmission shaft.

[0014] A pressure relief hole connected to the interior of the motor housing is opened through the output end face, and a pressure relief channel is opened in the shell wall of the transmission box housing. The two ends of the pressure relief channel are respectively a first channel opening and a second channel opening. The first channel opening is located on the inner wall of the transmission box housing to connect the pressure relief channel with the interior of the transmission box housing. The second channel opening is located on the input end face and is connected to the pressure relief hole; a circle of sealing portion is provided between the output end face and the input end face outside the second channel opening and the pressure relief hole.

[0015] Furthermore, the cross section of the pressure relief channel is circular and the inner diameter increases gradually from the first channel opening to the second channel opening.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the layout structure of the power system of the present invention on the whole vehicle, the power system is arranged longitudinally, and the axial direction of the motor is set along the front-to-back direction of the whole vehicle. The transmission box is also arranged front-to-back and connected to the rear of the motor. The transmission shaft of the transmission box is horizontally output and connected to the driving sprocket. The entire lateral size of the transmission box and the driving sprocket is also controlled within the diameter range of the motor shape. Compared with the lateral arrangement, it can effectively reduce the lateral space occupied by the power system, and the transmission box extends to one side from the middle of the vehicle width direction. Compared with the lateral arrangement, the transmission box extends outward from one end of the motor, which can effectively reduce the possibility of the transmission box protruding laterally outside the vehicle; avoiding the protrusion of the transmission box is conducive to improving riding comfort and the appearance of the whole vehicle; especially for the current situation where the axial size of the motor is generally larger than the radial size, the effect of saving lateral space by adopting the longitudinal arrangement of the power system is more significant.

[0018] It can be understood that the increase in the length direction of the motor can effectively improve the functional torque and other performance of the motor. The longitudinal motor arrangement of the utility model can avoid a major impact on other structures when increasing the motor length, which is conducive to product upgrading and optimization.

[0019] 2. In the layout structure of the power system described in the utility model on the whole vehicle, the transmission box is located behind the motor and on the inner side of the fork. Without increasing the width of the whole vehicle, the output shaft of the transmission box can be arranged along the vehicle width direction and coaxial with the fork shaft. The output shaft of the transmission box and the rear wheel shaft are driven by a chain. When the rear wheel rotates around the fork shaft with the cooperation of the shock absorber and the fork, the distance between the output shaft of the transmission box and the rear wheel shaft remains unchanged, and the tightness of the chain and sprocket is constant, which is conducive to increasing the service life of the chain.

[0020] 3. In the arrangement structure of the power system described in the present invention on the whole vehicle, without changing the original transmission box volume and the sealing connection processing structure, the transmission box housing and the motor housing are connected by opening a pressure relief channel and a pressure relief hole. When the power system is running, the pressure inside the original motor is lower than the internal pressure of the transmission box. After the transmission box housing and the motor housing are connected, the pressurized gas in the transmission box housing can be transported to the motor housing through the pressure relief channel and the pressure relief hole. Compared with the complete independence of the interior of the transmission box housing, the internal pressure of the transmission box housing is reduced, and the internal pressure of the transmission box can have a larger pressure relief space, thereby avoiding overflow and leakage of lubricating oil due to excessive internal pressure; and a breather valve is provided on the motor housing to ensure the normal operation of the whole, which is beneficial to improving the stability of the power system operation, and does not increase external structural parts, so the improvement cost is low and the effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a perspective view of the arrangement structure of a power system on a vehicle according to an embodiment;

[0022] FIG2 is a perspective view of the power system according to the embodiment;

[0023] FIG3 is a front view of the power system according to the embodiment;

[0024] FIG4 is a schematic cross-sectional view taken along line AA in FIG3 ;

[0025] Among them, the motor housing 1, the transmission box housing 2, the pressure relief hole 3, the pressure relief channel 4, the first channel opening 5, the second channel opening 6, the transmission shaft 7, the main body 8, the end cover 9, the connecting section 10, the conducting section 11, the first ring groove 14, the second ring groove 15, the motor shaft 17; the rear wheel 20, the transmission box 21, the flat fork 22, the vehicle controller 23, the terminal 24, the cradle frame 26, the hypoid gear 27, the driving sprocket 28, the frame 29, and the motor 30. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in 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 present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the figures, or the positions or relationships in which the utility model product is typically placed when in use. These terms are intended solely for ease of description and simplification of the description of the utility model, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or overhanging, but rather may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but rather may be slightly tilted. It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] Example:

[0029] Please refer to Figures 1 to 4, which show a layout structure of a power system on a complete vehicle, including a power system. The power system includes a motor 30 and a transmission box 21. The motor 30 is arranged in a lower middle position of the frame 29, and the motor shaft 17 of the motor 30 faces rearward and is arranged along the length direction of the vehicle. The transmission box 21 is connected to the rear of the motor 30. The transmission shaft 7 of the transmission box 21 is perpendicular to the motor shaft 17 and is arranged along the width direction of the vehicle. The motor shaft 17 extends into the transmission box 21 and is connected to one end of the transmission shaft 7. The other end of the transmission shaft 7 extends out of the transmission box 21 and is connected to a driving sprocket 28. The driving sprocket 28 is connected to the rear wheel axle chain transmission. The transmission box 21 and the driving sprocket 28 are both located within the range of the motor 30 in the width direction.

[0030] The arrangement structure of the power system described in the present invention on the whole vehicle is that, when the specifications of the motor 30 and the transmission box 21 are the same, the power system is arranged longitudinally, and the axial direction of the motor 30 is set along the front and rear direction of the whole vehicle. The transmission box 21 is also arranged front and rear and connected to the rear of the motor 30. The transmission shaft 7 of the transmission box 21 is horizontally output and connected to the driving sprocket 28. The entire lateral size of the transmission box 21 and the driving sprocket 28 is also controlled within the diameter range of the outer shape of the motor 30. Compared with the lateral arrangement, it can effectively reduce the lateral space occupied by the power system, and the transmission box 21 extends to one side from the middle part in the vehicle width direction. Compared with the lateral arrangement, the transmission box 21 extends outward from one end of the motor 30, which can effectively reduce the possibility of the transmission box 21 protruding laterally outside the vehicle; avoiding the protrusion of the transmission box 21 is conducive to improving riding comfort and the appearance of the whole vehicle; especially for the current situation where the axial size of the motor 30 is generally larger than the radial size, the effect of saving lateral space by adopting the longitudinal arrangement of the power system is more significant.

[0031] Please refer to Figures 1 and 2. The vehicle controller 23 is generally located at the front of the abdomen of the frame 29. In order to facilitate the wiring connection between the motor 30 and the vehicle controller 23, the motor 30 is set to be located behind the vehicle controller 23 on the frame 29, and the terminal 24 of the motor 30 is set on the front side of the motor 30.

[0032] Please refer to Figures 1 and 2. The motor 30 is located below the vehicle controller 23. The motor 30 is cylindrical and has a number of circumferentially evenly distributed heat dissipation fins (not shown in the figures) on the side. The heat dissipation fins are extended along the motor shaft 17. In this way, when driving, the motor 30 is not blocked by the vehicle controller 23, and air flows quickly through the gaps between all adjacent heat dissipation fins, which is beneficial to improving the heat dissipation of the motor 30.

[0033] Please refer to Figure 1. In order to facilitate the arrangement of the vehicle controller 23 and the motor 30 and to improve the stability of the motor 30 on the frame 29, a double cradle frame 29 is adopted, that is, the frame 29 includes two cradle frames 26 arranged at intervals along the width direction of the vehicle, the motor 30 is located on the inner side of the cradle frame 26 and abuts against the bottom, the front side of the motor 30 is fixedly connected to the two cradle frames 26 respectively, and the vehicle controller 23 is located between the two cradle frames 26 and fixedly connected.

[0034] Referring to FIG1 , the transmission box 21 is located inside the fork 22, and the transmission shaft 7 is coaxial with the fork shaft (not shown). In this embodiment, the fork shaft is composed of two short shafts, so that the two sides of the fork 22 facing the motor 30 are respectively connected to the frame 29 for rotation.

[0035] When the power system is arranged horizontally, it is difficult to set the transmission shaft 7 of the transmission box 21 coaxially with the fork shaft due to the limitation of the vehicle width, that is, the fork shaft 22 and the frame 29 are rotatably connected to the transmission shaft 7. When the rear wheel 20 rotates around the fork shaft with the cooperation of the shock absorber and the fork 22, the distance between the transmission shaft 7 and the rear wheel axle will change, and the chain will be tightened or loosened, which may easily cause the chain to be stretched and its service life to be shortened. However, the utility model arranges the power system longitudinally, and the transmission shaft 7 can be set along the vehicle width direction and coaxial with the fork shaft without increasing the width of the entire vehicle. The transmission shaft 7 and the rear wheel axle are chain-driven. When the rear wheel 20 rotates around the fork shaft with the cooperation of the shock absorber and the fork 22, the distance between the transmission shaft 7 and the rear wheel axle remains unchanged, and the tightness of the chain and sprocket is constant, which is conducive to improving the service life of the chain.

[0036] 3 and 4 , the output shaft of the motor 30 and the input shaft of the transmission box 21 are respectively provided with a hypoid gear 27 and meshed with each other; the use of the hypoid gear 27 meshing transmission between the motor 30 and the transmission box 21 is beneficial to reduce noise and improve transmission stability.

[0037] In order to prevent the lubricating oil in the transmission box 21 from leaking out due to the increase in internal pressure during operation, a hole is usually opened in the transmission box 21 and an external vent pipe is connected to relieve the pressure. However, the vent pipe is an externally exposed part and is easily damaged, contaminated, and easily falls off. It may even absorb water into the transmission box 21 due to changes in air pressure. Therefore, the present invention improves the pressure relief method of the transmission box 21 as follows:

[0038] Please refer to Figures 3 and 4. The motor 30 includes a motor housing 1, and the transmission box 21 includes a transmission box housing 2. The side of the motor housing 1 connected to the transmission box housing 2 is the output end face, and the side of the transmission box housing 2 connected to the motor housing 1 is the input end face. The output end face and the input end face are respectively penetrated by an output port and an input port, and the motor shaft 17 extends into the transmission box housing 2 through the output port and the input port and is connected to the transmission shaft 7 for transmission; a pressure relief hole 3 connected to the interior of the motor housing 1 is penetrated by a pressure relief hole 3, and a pressure relief channel 4 is opened in the shell wall of the transmission box housing 2. The two ends of the pressure relief channel 4 are respectively a first channel port 5 and a second channel port 6. The first channel port 5 is located on the inner wall of the transmission box housing 2 to connect the pressure relief channel 4 with the interior of the transmission box housing 2. The second channel port 6 is located on the input end face and is connected to the pressure relief hole 3; a circle of sealing gasket (not shown in the figure) is provided between the output end face and the input end face, abutting the second channel port 6 and the pressure relief hole 3.

[0039] In this way, when the power system is running, the pressurized gas in the transmission box housing 2 can be transported to the motor housing 1 through the pressure relief channel 4 and the pressure relief hole 3. Compared with the completely independent interior of the transmission box housing 2, the internal pressure of the transmission box can have a larger pressure relief space, and the internal pressure of the transmission box housing 2 can be reduced, thereby avoiding the overflow and leakage of lubricating oil due to excessive internal pressure.

[0040] Please refer to Figures 3 and 4. In order to reduce the possibility of lubricating oil entering the pressure relief channel 4 and causing blockage, the pressure relief channel 4 is designed to be a circular channel with a taper, and the inner diameter of the first channel opening 5 is smaller than the inner diameter of the second channel opening 6. Please refer to Figures 3 and 4. The transmission case housing 2 includes an axially connected main body 8 and an end cover 9. The end cover 9 is used to close the opening at one end of the main body 8, and the output end face is located on the main body 8. The pressure relief channel 4 is opened on the main body 8 and includes a connecting section 10 and a conducting section 11 connected vertically. The free end of the connecting section 10 is the first channel opening 5, and the free end of the conducting section 11 is the second channel opening 6. The connecting section 10 is in the same direction as the transmission shaft 7 and is opposite to the opening. In this way, the pressure relief channel 4 is divided into two sections. The connecting section 10 can be drilled on the inner wall of the main body 8 through the opening, and the conducting section 11 is drilled directly from the input end face. The two ends are drilled in sections, which helps to reduce the difficulty of processing and forming the pressure relief channel 4.

[0041] Please refer to Figures 3 and 4. A first annular groove 14 is recessed on the input end surface, the input port is located on the inner side of the first annular groove 14, and the second channel port 6 is located on the bottom surface of the first annular groove 14; a second annular groove 15 is recessed on the output end surface opposite to the first annular groove 14, the output port is located on the inner side of the second annular groove 15, the pressure relief hole 3 is opened on the bottom surface of the second annular groove 15, and the second channel port 6 is connected to the pressure relief hole 3 through the first annular groove 14 and the second annular groove 15, and the first annular groove 14 and the second annular groove 15 are both located on the inner side of the sealing gasket; in this way, there is no need to ensure that the pressure relief hole 3 is directly opposite to the second channel port 6, which is conducive to reducing the difficulty of manufacturing and assembly; in addition, the pressure relief channel 4 extends horizontally, the first channel port 5 is higher than the transmission shaft 7, and the pressure relief hole 3 is higher than the motor shaft 17.

[0042] Please refer to Figures 3 and 4. In this embodiment, the motor shaft 17 extends into the transmission box housing 2 through the output port and the input port. The free end of the motor shaft 17 has hyperbolic teeth and meshes with the hypoid gear 27.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A layout structure of a power system on a vehicle, characterized in that: The vehicle frame comprises a power system, which includes a motor and a transmission box. The motor is arranged at a lower position in the middle of the vehicle frame, and the motor shaft of the motor faces rearward and is arranged along the length direction of the vehicle. The transmission box is connected to the rear of the motor. The transmission shaft of the transmission box is perpendicular to the motor shaft and is arranged along the width direction of the vehicle. The motor shaft extends into the transmission box and is transmission-connected to one end of the transmission shaft, and the other end of the transmission shaft extends out of the transmission box and is connected to a driving sprocket. The driving sprocket is transmission-connected to the rear wheel shaft chain, and the transmission box and the driving sprocket are both located within the width range of the motor.

2. The arrangement structure of a power system on a vehicle according to claim 1, characterized in that: The motor is located behind the vehicle controller on the frame, and the wiring terminal of the motor is located on the front side of the motor so as to be connected with the vehicle controller.

3. The arrangement structure of a power system on a vehicle according to claim 2, characterized in that: The motor is lower than the vehicle controller to dissipate heat in the wind. The motor housing is cylindrical in shape and has a plurality of circumferentially evenly distributed cooling fins on the outer circumferential side. The cooling fins extend along the axial direction of the motor.

4. The arrangement structure of a power system on a vehicle according to claim 3 is characterized in that: The frame is a double cradle frame and includes two cradle frames spaced apart in the vehicle width direction, the motor is located inside the cradle frame and abuts against the bottom, the front side of the motor is fixedly connected to the two cradle frames respectively, and the vehicle controller is located between the two cradle frames and fixedly connected.

5. The arrangement structure of the power system on the vehicle according to claim 1 is characterized in that: The motor shaft and the transmission shaft are respectively provided with hyperbolic gears which mesh with each other so as to achieve transmission connection between the motor shaft and the transmission shaft.

6. The arrangement structure of a power system on a vehicle according to claim 1, characterized in that: A fork is arranged at the rear of the frame, the front end of which is rotatably connected to the frame via a fork shaft arranged along the width direction of the vehicle, and the rear wheel axle is arranged at the rear end of the fork along the width direction of the vehicle; the transmission box is located inside the fork, and the transmission shaft is coaxial with the fork shaft.

7. The arrangement structure of the power system on the vehicle according to claim 1 is characterized in that: The motor includes a motor housing, and the transmission box includes a transmission box housing. The side of the motor housing connected to the transmission box housing is an output end face, and the side of the transmission box housing connected to the motor housing is an input end face. The output end face and the input end face are respectively penetrated with an output port and an input port. The motor shaft extends into the transmission box housing through the output port and the input port and is transmission-connected with the transmission shaft. A pressure relief hole connected to the interior of the motor housing is opened through the output end face, and a pressure relief channel is opened in the shell wall of the transmission box housing. The two ends of the pressure relief channel are respectively a first channel opening and a second channel opening. The first channel opening is located on the inner wall of the transmission box housing to connect the pressure relief channel with the interior of the transmission box housing. The second channel opening is located on the input end face and connected to the pressure relief hole; a circle of sealing portion is provided between the output end face and the input end face outside the second channel opening and the pressure relief hole.

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