Powertrain and motorcycle using the same

Abstract

The present application discloses a power assembly and a motorcycle using the power assembly, the power assembly includes an engine and a speed change device, the engine includes a crankshaft and a crankcase, the crankshaft is supported by the crankcase; the speed change device includes a gearbox and a speed change mechanism, the speed change mechanism is at least partially located in the gearbox, and the gearbox is connected to the crankcase; the speed change mechanism includes a power input wheel, a power output wheel and a wheel connection belt, the power input wheel is connected to the crankshaft transmission; the wheel connection belt includes a suspended section, the suspended section is located between the power input wheel and the power output wheel; the speed change device also includes a guide component located in the gearbox, the guide component is movably connected to the gearbox, the guide component is located on one side of the suspended section, and the guide component can guide at least part of the airflow in the gearbox to the suspended section. Through the above arrangement, sufficient cooling of the wheel connection belt is achieved, which is conducive to improving the heat dissipation efficiency of the speed change mechanism.

Description

Technical Field

[0001] The invention relates to the field of power devices, in particular to a power assembly and a motorcycle using the power assembly. Background Art

[0002] At present, the engine powertrain includes an engine and a transmission device. The engine includes a crankshaft and a crankcase. The crankshaft is supported by the crankcase. The transmission device includes a gearbox and a speed change mechanism. The speed change mechanism is basically located in the gearbox, and the gearbox is connected to the crankcase. The crankshaft is connected to the speed change mechanism by transmission.

[0003] In the related art, there are many types of speed change mechanisms. For the CVT (Continuously Variable Transmission) speed change mechanism, the CVT speed change mechanism includes a power input wheel, a power output wheel, a wheel connecting belt and a heat dissipation structure. The power input wheel and the power output wheel are connected by a wheel connecting belt transmission. The wheel connecting belt will generate heat when working, and the heat dissipation structure can reduce the heat by air cooling and other means. The current heat dissipation structure mainly includes an air guide wall in the shell, and the air guide wall is formed by the inner wall of the shell. The heat dissipation process is that the airflow is introduced into the shell by an external blower, and the air is guided by the air guide wall to dissipate the heat of the wheel connecting belt. The heat dissipation principle relies on the air guiding effect of the air guide wall. The efficiency of this heat dissipation structure is not high enough. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide a power assembly and a motorcycle using the power assembly, wherein the speed change mechanism of the power assembly has a higher heat dissipation efficiency.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] A power assembly comprises an engine and a transmission device, wherein the engine comprises a crankshaft and a crankcase, wherein the crankshaft is supported by the crankcase; the transmission device comprises a gearbox and a transmission mechanism, wherein the transmission mechanism is at least partially located in the gearbox, and the gearbox is connected to the crankcase; the transmission mechanism is at least partially located in the gearbox, wherein the transmission mechanism comprises a power input wheel, a power output wheel and a wheel connecting belt, wherein the power input wheel and the power output wheel are rotationally connected in the gearbox, and the power input wheel and the power output wheel are transmission-connected via a wheel connecting belt; the power input wheel is transmission-connected to the crankshaft; the wheel connecting belt comprises a suspended section, wherein the suspended section is located between the power input wheel and the power output wheel; the transmission device further comprises a flow guide component located in the gearbox, wherein the flow guide component is movably connected to the gearbox, wherein the flow guide component is located on one side of the suspended section, and wherein the flow guide component can guide at least part of the airflow in the gearbox to the suspended section.

[0007] Furthermore, the guide assembly includes a guide member, an installation area is provided in the gearbox, and the guide member is movably connected to the installation area; an air outlet section is provided at the end of the guide member away from the installation area; when the guide member is impacted by the airflow, the guide member can move relative to the gearbox, and along the extension direction of the suspended section, the distance between the air outlet section and the installation area can change.

[0008] Furthermore, the guide member includes multiple guide parts, and the multiple guide parts are movably connected in sequence; a guide windward surface is provided on the side of each guide part close to the suspended section, and the multiple guide windward surfaces form a coherent total guide surface; when any two adjacent guide parts move relative to each other, the area of ​​the total guide surface can change.

[0009] Furthermore, the flow guide assembly includes an elastic member arranged on the flow guide member, and two ends of the elastic member are respectively connected to two different flow guide parts; the force of the elastic member acting on the flow guide member has a tendency to reduce the area of ​​the total flow guide surface.

[0010] Furthermore, the guide assembly includes an elastic connector, both ends of which are respectively connected to the gearbox and one of the guide parts; the force exerted by the elastic connector on the guide part has a tendency to reduce the area of ​​the total guide surface, and has a tendency to reduce the distance between the air outlet section and the installation area along the extension direction of the suspended section.

[0011] Furthermore, the guide assembly includes an elastic connector connected between the gearbox and the guide member, and the force exerted by the elastic connector on the guide member has a tendency to reduce the distance between the air outlet section and the installation area along the extension direction of the suspended section.

[0012] Furthermore, a first limiter and a second limiter are provided between the installation area and the guide member, the first limiter is provided on the guide member, and the second limiter is provided on the installation area; the elastic connecting member has a tendency to drive the first limiter and the second limiter to always abut against each other.

[0013] Furthermore, any plane perpendicular to the central axis of rotation of the power input wheel is defined as a longitudinal plane, the projection of the extension direction of the air outlet section in the longitudinal plane is the first projection line, the projection of the extension direction of the suspended section in the longitudinal plane is the second projection line, and the angle between the first projection line and the second projection line ranges from 0° to 60°.

[0014] Furthermore, an arc-shaped air duct is formed between the speed change mechanism and the inner wall of the gearbox, an air outlet is provided at one end of the arc-shaped air duct, and the connection position between the guide assembly and the gearbox is provided at the air outlet.

[0015] To achieve the above objectives, this application adopts the following technical solutions:

[0016] A motorcycle comprises a power assembly in any of the above-mentioned implementation modes, the motorcycle also comprises a frame and a traveling assembly, the traveling assembly is connected to the frame and at least partially located below the frame, the power assembly is supported by the frame, and the power output wheel is transmission-connected to the traveling assembly.

[0017] The above-mentioned power assembly can guide the gas in the gearbox to the suspended section of the wheel connecting belt through the guide component, so as to achieve sufficient cooling of the wheel connecting belt, which is beneficial to improving the heat dissipation efficiency of the transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the overall structure of the powertrain provided in an embodiment of the present application.

[0019] Figure 2 A partial exploded view of a powertrain provided in an embodiment of the present application.

[0020] Figure 3 An exploded view of the gearbox, flow guide assembly and speed change mechanism provided in an embodiment of the present application.

[0021] Figure 4 A side view of a gearbox, a speed change mechanism and a first flow guide assembly provided in an embodiment of the present application.

[0022] Figure 5 Provided for the embodiments of this application Figure 4 A partial enlarged view of point A in the middle.

[0023] Figure 6 A side view of a gearbox, a speed change mechanism and a second flow guide assembly provided in an embodiment of the present application.

[0024] Figure 7 Provided for the embodiments of this application Figure 6 A partial enlarged view of point B in the middle.

[0025] Figure 8 A side view of a gearbox, a speed change mechanism and a third flow guide assembly provided in an embodiment of the present application.

[0026] Fig. 9 Provided for the embodiments of this application Figure 8 A partial enlarged view of point C in the middle.

[0027] Fig.10 A schematic diagram of the structure of a motorcycle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.

[0029] like Figure 1 and Figure 2 A power assembly is shown, which includes an engine 12 and a transmission device. The engine 12 includes a crankshaft 121 and a crankcase 114. The crankshaft 121 is supported by the crankcase 114. The transmission device includes a gearbox 116 and a transmission mechanism 13. The transmission mechanism 13 is at least partially located in the gearbox 116, and the transmission mechanism 13 is connected to the crankshaft 121 in a transmission manner.

[0030] Among them, the gearbox 116 and the crankcase 114 are used to form the housing structure 11 of the power assembly 100, and the housing structure 11 also includes a cylinder head cover 111, a cylinder head 112, a cylinder block 113 and an oil pan 115. The housing structure 11 constitutes the basic framework of the power assembly 100, and the housing structure 11 is used to accommodate and protect the internal components of the power assembly 100. The cylinder head cover 111, the cylinder head 112, the cylinder block 113, the crankcase 114, and the oil pan 115 are connected in sequence, and the gearbox 116 is connected to the crankcase 114.

[0031] The engine 12 also includes a connecting rod assembly 122 connected to a crankshaft 121 , which is at least partially located within the crankcase 114 and at least partially located within the transmission 116 , and the connecting rod assembly 122 is at least partially located within the crankcase 114 and at least partially located within the cylinder block 113 .

[0032] When the power assembly 100 is working, the fuel and air are mixed into a combustible mixture and then transported to the combustion chamber 1120 of the power assembly 100. After the combustible mixture is burned, a large amount of heat is released, and the pressure and temperature of the gas in the cylinder body 113 rise rapidly, thereby driving the connecting rod assembly 122 to move. Among them, the combustion chamber 1120 of the power assembly 100 is composed of the bottom of the cylinder head 112 and the top of the cylinder body 113. The crankshaft 121 is connected to the connecting rod assembly 122. The movement of the connecting rod assembly 122 can drive the crankshaft 121 to move, and then drive the speed change mechanism 13 to move. The output end of the speed change mechanism 13 transmits power to the outside, and finally makes the vehicle move.

[0033] In order to clearly explain the technical solution of this application, the following is also defined: Figure 1 It can be understood that the front-to-back direction in the embodiment of the present application refers to the length direction of the power assembly 100, the left-right direction refers to the width direction of the power assembly 100, and the up-down direction refers to the height direction of the power assembly 100.

[0034] Among them, the cylinder head cover 111, the cylinder head 112, the cylinder block 113, the crankcase 114 and the oil pan 115 are arranged in sequence along an oblique downward direction, that is, the crankcase 114 is arranged on the upper side of the oil pan 115, the cylinder block 113 is arranged on the upper side of the crankcase 114, the cylinder head 112 is arranged on the upper side of the cylinder block 113, and the cylinder head cover 111 is arranged on the upper side of the cylinder head 112.

[0035] As an implementation method, the gearbox 116 and the crankcase 114 are distributed along the width direction of the powertrain 100, that is, the gearbox 116 is located on the left or right side of the crankcase 114, so that the structure of the gearbox 116 and the crankcase 114 can be made more compact, which is also beneficial to improving the structural compactness of the powertrain 100.

[0036] like Figure 3 and Figure 4 As shown, the speed change mechanism 13 includes a power input wheel disc 131, a power output wheel disc 132 and a wheel disc connection belt 133. Specifically, the power input wheel disc 131 is drivingly connected to the crankshaft 121, and the power input wheel disc 131 and the power output wheel disc 132 are drivingly connected through the wheel disc connection belt 133, so that the power output wheel disc 132 can transmit the power of the crankshaft 121 to the outside of the power assembly 100. The power input wheel disc 131 and the power output wheel disc 132 are both rotatably connected to the gearbox 116.

[0037] More specifically, the wheel connection belt 133 also includes a suspended section 1331, and the suspended section 1331 is located between the power input wheel 131 and the power output wheel 132. That is, the suspended section 1331 is a portion of the wheel connection belt 133 that is not in contact with the power input wheel 131 and the power output wheel 132. Among them, the suspended section 1331 basically extends along a preset straight line 1301, and the preset straight line 1301 is basically perpendicular to the rotation center axis of the power input wheel 131, and the preset straight line 1301 is basically perpendicular to the rotation center axis of the power output wheel 132.

[0038] It should be noted that when the speed change mechanism 13 is in operation, the position of the suspended section 1331 on the wheel connection belt 133 will change, and the suspended section 1331 is always the part of the wheel connection belt 133 that is not in contact with the power input wheel 131 and the power output wheel 132.

[0039] In this embodiment, the power assembly 100 includes a flow guide component 17 located in the gearbox 116, the flow guide component 17 is movably connected to the gearbox 116, and the flow guide component 17 is located on one side of the suspended section 1331. The flow guide component 17 can guide at least part of the airflow in the gearbox 116 to the suspended section 1331. Through the above arrangement, the flow guide component 17 can convey the airflow in the gearbox 116 to the suspended section 1331, so that the suspended section 1331 can be cooled by the airflow in the gearbox 116, thereby improving the heat dissipation effect of the suspended section 1331, so as to avoid the failure of the wheel connection belt 133 due to heat. In addition, the above arrangement can also enable the airflow in the gearbox 116 to be accurately conveyed to the suspended section 1331, so as to avoid the problem of uneven and insufficient heat dissipation of the suspended section 1331 caused by the airflow only relying on the inner wall of the gearbox 116 to guide the airflow, thereby improving the heat dissipation efficiency of the speed change mechanism 13.

[0040] It should be noted that there is a gap between the power input wheel disc 131 and the power output wheel disc 132, and the suspended section 1331 includes a first side and a second side arranged opposite to each other. The first side of the suspended section 1331 faces the gap between the power input wheel disc 131 and the power output wheel disc 132, and the second side of the suspended section 1331 faces the flow guide assembly 17, that is, the flow guide assembly 17 is located on the second side of the suspended section 1331.

[0041] It should be noted that the gearbox 116 is provided with an air inlet 1161a and an air outlet 1161b, the air inlet 1161a is in communication with the internal space of the gearbox 116, and the air outlet 1161b is also in communication with the internal space of the gearbox 116. The external airflow enters the internal space of the gearbox 116 through the air inlet 1161a, and then flows out of the internal space of the gearbox 116 through the air outlet 1161b, so as to achieve heat dissipation of the speed change mechanism 13. Among them, the guide component 17 can guide the airflow transported from the air inlet 1161a to the gearbox 116 to the suspended section 1331.

[0042] Specifically, when the speed change mechanism 13 is working, the friction between the wheel connection belt 133 and the power input wheel 131 will generate a lot of heat, and the friction between the wheel connection belt 133 and the power output wheel 132 will also generate a lot of heat, which will cause the temperature of the wheel connection belt 133 itself to be high, and the gas in the gearbox 116 will flow around the speed change mechanism 13 to achieve heat dissipation of the power input wheel 131, the power output wheel 132 and the wheel connection belt 133. Among them, since the wheel connection belt 133 is at least partially arranged near the air outlet 1161b, and the gas will be directly discharged to the outside after flowing through the air outlet 1161b, the present application arranges a guide component 17 between the air outlet 1161b and the wheel connection belt 133, and the guide component 17 can guide the airflow in the gearbox 116 to the wheel connection belt 133, and prevent the gas near the air outlet 1161b from being directly discharged to the outside, so as to avoid uneven and insufficient heat dissipation of the wheel connection belt 133. Through the above arrangement, the wheel connecting belt 133 can be fully cooled, which is beneficial to improving the heat dissipation efficiency of the speed change mechanism 13. At the same time, it can prevent the wheel connecting belt 133 from being damaged due to continuous high temperature, which is also beneficial to improving the service life of the speed change mechanism 13.

[0043] More specifically, an arc-shaped air duct 1162 is formed between the inner walls of the speed change mechanism 13 and the gearbox 116, and the air inlet 1161a and the air outlet 1161b are respectively arranged at the two ends of the arc-shaped air duct 1162, and the connection position between the guide component 17 and the gearbox 116 is arranged at the air outlet 1161b, so that the guide component 17 can better receive the airflow in the gearbox 116, so as to improve the heat dissipation effect of the suspended section 1331.

[0044] It should be noted that Figure 4 The dashed line with an arrow in the middle refers to the flow path of the airflow used to dissipate heat from the suspended section 1331 in the present application.

[0045] like Figure 2 and Figure 3 As shown, it should be noted that when the transmission mechanism 13 operates at a high load, the cooling system of the entire transmission mechanism 13 will increase the flow rate of the airflow blown into the gearbox 116 to improve the cooling efficiency of the components in the gearbox 116.

[0046] like Figure 4 and Figure 5As shown, as an implementation, the guide assembly 17 includes a guide member 171, a mounting area 1163 is provided in the gearbox 116, and the guide member 171 is movably connected to the mounting area 1163, so that the guide member 171 can have a degree of freedom of movement relative to the mounting area 1163. Specifically, when the guide member 171 is impacted by the airflow, the airflow has an impact force acting on the guide member 171, and the impact force enables the guide member 171 to move relative to the gearbox 116. More specifically, an air outlet section 1711 is provided at the end of the guide member 171 away from the mounting area 1163. When the guide member 171 is impacted by the airflow, the distance between the air outlet section 1711 and the mounting area 1163 can change along the extension direction of the suspended section 1331, that is, the air outlet section 1711 can move due to the impact of the airflow. Through the above arrangement, the guide angle of the guide member 171 relative to the suspended section 1331 can be changed by moving the air outlet section 1711, so that the guide angle of the guide member 171 can be adjusted according to different working conditions, and then the heat dissipation effect of the guide member 171 on the suspended section 1331 can be changed. In addition, the movement of the air outlet section 1711 can be adjusted by the impact force of the airflow (i.e., the flow velocity of the airflow), that is, the impact force of the airflow can adjust the guide angle of the guide member 171, so the present application can automatically adjust the distance between the air outlet section 1711 and the installation area 1163 along the extension direction of the suspended section 1331 by adjusting the flow velocity of the airflow, and then the heat dissipation effect of the guide member 171 on the suspended section 1331 can be adjusted.

[0047] It should be noted that in the present application, the greater the impact force of the airflow on the guide member 171, the smaller the guide angle of the guide member 171 relative to the suspended section 1331, that is, the larger the distance between the air outlet section 1711 and the installation area 1163 along the extension direction of the suspended section 1331, so that the airflow can be guided by the guide member 171 to a larger range, so that more areas of the suspended section 1331 can be blown by the airflow, thereby achieving the cooling purpose.

[0048] It should be noted that the movable connection between the guide member 171 and the installation area 1163 can be rotation, sliding or ball joint movement, and the present application does not impose any limitation thereto, and it is only required that the guide member 171 and the installation area 1163 can be movably connected.

[0049] As an implementation method, the guide member 171 includes a plurality of guide portions 1712, and the plurality of guide portions 1712 are movably connected in sequence, so that at least one guide portion 1712 can move under the impact of the airflow, thereby realizing the change of the guide area of ​​the guide member 171. Specifically, a guide windward surface 1712a is provided on the side of each guide portion 1712 close to the suspended section 1331, and the plurality of guide windward surfaces 1712a form a continuous total guide surface 1713. Among them, the area of ​​the total guide surface 1713 is the guide area of ​​the guide member 171. If the guide area of ​​the guide member 171 increases, it is equivalent to a longer boundary for defining the airflow blowing path, and the range on the suspended section 1331 that can be blown by the airflow at a higher flow rate is wider, and the heat dissipation efficiency of the suspended section 1331 is better. On the contrary, if the guide area of ​​the guide member 171 decreases, the heat dissipation efficiency of the suspended section 1331 is worse.

[0050] In the case where the plurality of guide portions 1712 are impacted by the airflow, when any two adjacent guide portions 1712 move relative to each other, the area of ​​the total guide surface 1713 can change, so that the guide area of ​​the guide member 171 can be adjusted to adjust the heat dissipation effect of the guide member 171 on the suspended section 1331. More specifically, the greater the relative movement amplitude of any two adjacent guide portions 1712, the greater the area of ​​the total guide surface 1713, so that the heat dissipation effect of the guide member 171 on the suspended section 1331 is better.

[0051] It should be noted that the movable connection between two adjacent guide parts 1712 can be rotation, sliding or ball-joint movement, and the present application does not impose any limitation thereto, and it is only required that the two adjacent guide parts 1712 can be movably connected.

[0052] As an implementation, the air guide 1712 farthest from the installation area 1163 is defined as the air outlet air guide, and the air outlet section 1711 is the air outlet air guide. Alternatively, as another implementation, the air outlet section 1711 is located at one end of the air outlet air guide far from the installation area 1163. It should be noted that in the present application, the air outlet section 1711, i.e., the air outlet air guide, is described as an example.

[0053] As an implementation, the flow guide assembly 17 includes an elastic member 172 disposed on the flow guide 171, and the two ends of the elastic member 172 are respectively connected to two different flow guides 1712. As an implementation, the two ends of the elastic member 172 are respectively connected to two adjacent flow guides 1712. As another implementation, the two ends of the elastic member 172 are respectively connected to two non-adjacent flow guides 1712. Taking the former as an example, when the number of flow guides 1712 is greater than n, the elastic member 172 can be set to n-1, so that two adjacent flow guides 1712 can be connected by one elastic member 172. Wherein, n is a positive integer greater than 1.

[0054] When the multiple guides 1712 are not impacted by the airflow, the elastic member 172 is in the initial state, that is, the elastic member 172 is neither stretched nor compressed at this time; when the multiple guides 1712 are impacted by the airflow, at least one guide 1712 moves under the impact of the airflow, so that the relative position of at least two adjacent guides 1712 changes, and then the elastic members 172 on at least two adjacent guides 1712 are elastically deformed, such as stretched. When the elastic member 172 is elastically deformed, the elastic member 172 will generate a force on the two adjacent guides 1712, and the force makes the two adjacent guides 1712 have a tendency to approach each other, that is, the force will make the moving guide 1712 have a tendency to return to the initial position. Among them, the initial position of the guide 1712 refers to the position of the guide 1712 when it is not impacted by the airflow, and when the guide 1712 is in the initial position, the area of ​​the total guide surface 1713 is the smallest.

[0055] Furthermore, the movement of the guide member 171 will change the area of ​​the total guide surface 1713, so as to adjust the heat dissipation effect of the suspended section 1331. Therefore, the arrangement of the elastic member 172 can make the force of the elastic member 172 acting on the guide member 171 have a tendency to reduce the area of ​​the total guide surface 1713, so that when the plurality of guide portions 1712 are not impacted by the airflow, or when the guide member 171 is not in a working state, the guide portions 1712 can be restored to their initial positions.

[0056] In other words, when the impact of the airflow on the guide member 171 becomes smaller, it proves that the speed change mechanism 13 begins to reduce the workload, and the cooling demand of the suspended section 1331 is also reduced. The setting of the elastic member 172 can reset the guide part 1712 in time when the cooling demand of the suspended section 1331 is reduced, so that the area of ​​the total guide surface 1713 is reduced, that is, the occupied volume of the entire guide member 171 is reduced, which can reduce the risk of contact and interference between the guide member 171 and components such as the suspended section 1331.

[0057] As an implementation method, the guide assembly 17 includes an elastic connector 173, and the two ends of the elastic connector 173 are respectively connected to the gearbox 116 and one of the guide parts 1712. The elastic connector 173 can be connected to any one of the guide parts 1712, and it is only necessary to enable any one of the guide parts 1712 to be connected to the gearbox 116 through the elastic connector 173.

[0058] In one implementation, the end of the elastic connector 173 is connected to a guide portion 1712 closest to the mounting area 1163, and the connection point between the elastic connector 173 and the guide portion 1712 is located below the rotation point of the guide portion 1712 relative to the mounting area 1163. Figure 5 The counterclockwise rotation trend can reduce the distance between the air outlet section 1711 and the installation area 1163 along the extension direction of the suspended section 1331, so the range on the suspended section 1331 that can be blown by the airflow at a higher flow rate is smaller. In actual practice, when the speed change mechanism 13 begins to reduce the workload, the cooling demand of the suspended section 1331 is also reduced, and the airflow velocity and flow rate blown to the vicinity of the guide member 171 will decrease. At this time, the operating speed of the wheel connecting belt 133 is usually also reduced. By setting an elastic connecting member 173, this implementation method can drive the entire guide member 171 to move along the direction of the suspension section 1331 when the airflow velocity and flow rate are reduced. Figure 5 Rotating counterclockwise, although the range of the suspended section 1331 that can be blown by the airflow at a higher flow rate becomes smaller, the airflow is more concentrated, and the airflow cooling efficiency per unit area on the suspended section 1331 will not be significantly reduced, and may even be improved. Combined with the reduced operating speed of the wheel connecting belt 133, the suspended section 1331 can be better cooled.

[0059] In another implementation, the end of the elastic connector 173 is connected to another guide portion 1712, and the connection point between the elastic connector 173 and the guide portion 1712 is located below the rotation point of the guide portion 1712 relative to the mounting area 1163. The elastic connector 173 has the function of driving the entire guide portion 171 to move along the guide portion 1712. Figure 5 The counterclockwise rotation trend and the tendency to drive the air guide 1712 toward the installation area 1163 will reduce the area of ​​the total air guide surface 1713. In this implementation, when the speed change mechanism 13 starts to reduce the workload and the cooling demand of the suspended section 1331 is also reduced, the elastic connector 173 can not only prevent the airflow cooling efficiency per unit area on the suspended section 1331 from being significantly reduced, but also reduce the risk of contact and interference between the air guide 171 and the suspended section 1331 and other components.

[0060] In order to better illustrate the specific implementation method of the present application, the present application takes the example that the movable connection between two adjacent guide parts 1712 is sliding and the movable connection between the guide component 17 and the gearbox 116 is rotating connection.

[0061] like Figure 4 and Figure 5As shown, the rotational connection between the guide assembly 17 and the gearbox 116 is the rotational connection between the guide member 171 and the gearbox 116 . Specifically, the rotational connection between the guide assembly 17 and the gearbox 116 is the rotational connection between the guide portion 1712 closest to the installation area 1163 and the gearbox 116 .

[0062] As an implementation method, a rotating shaft 1164 may be provided on the gearbox 116, the rotating shaft 1164 is integrally formed with or fixedly connected to the gearbox 116, and the air guide 171 is sleeved on the rotating shaft 1164 and is rotationally connected to the rotating shaft 1164, thereby realizing the rotational connection between the air guide 171 and the gearbox 116. In the present application, the axis of the rotating shaft 1164 extends substantially along the width direction of the power assembly 100, that is, the axis of the rotating shaft 1164 is parallel to the rotational center axis of the power input wheel 131.

[0063] Specifically, when the guide member 171 is impacted by the airflow, the guide member 171 and the gearbox 116 rotate relative to each other, and the plurality of guide parts 1712 slide relative to each other, thereby increasing the guide angle of the guide member 171 relative to the suspended section 1331 and increasing the area of ​​the total guide surface 1713, thereby improving the heat dissipation effect of the suspended section 1331.

[0064] More specifically, the relative sliding between two adjacent guide portions 1712 can be achieved in the following manner:

[0065] The two adjacent guides 1712 are defined as a first guide and a second guide, and the second guide is closer to the mounting area 1163 than the first guide. A sliding groove 1712b is provided at one end of the first guide close to the second guide, and at least part of one end of the second guide close to the first guide is located in the sliding groove 1712b and is slidably connected to the sliding groove 1712b, so that the first guide and the second guide can slide relative to each other. The setting of the elastic member 172 can prevent the second guide from detaching from the sliding groove 1712b, thereby preventing the first guide from detaching from the second guide, and further achieving the reliability of the guide 171.

[0066] like Figure 6 and Figure 7 As shown, more specifically, the relative sliding between two adjacent guide portions 1712 can also be achieved in the following manner:

[0067] The two adjacent guides 1712 are defined as the third guide and the fourth guide, and the fourth guide is closer to the installation area 1163 than the third guide. The guide member 171 also includes a connecting portion 1714, and the third guide and the fourth guide can slide relative to the connecting portion 1714, so as to achieve sliding between the third guide and the fourth guide. Among them, a slide groove 1714a can be provided on the connecting portion 1714, and the first guide and the second guide are both slidably connected with the slide groove 1714a on the connecting portion 1714. It should be noted that the setting of the elastic member 172 can prevent the first guide from being separated from the slide groove 1714a and the second guide from being separated from the slide groove 1714a, so as to avoid the separation of the first guide and the second guide, and then achieve the reliability of the guide member 171.

[0068] like Figure 8 and Fig. 9 As shown, in order to better illustrate the specific implementation of the present application, the present application takes the movable connection between two adjacent guide parts 1712 as a rotational connection and the movable connection between the guide assembly 17 and the gearbox 116 as a rotational connection as an example for illustration.

[0069] The manner in which the air guide assembly 17 and the gearbox 116 are rotatably connected is described in detail above and will not be repeated here.

[0070] In this embodiment, an elastic film 1715 may be provided on one side of the guide member 171 close to the suspended section 1331. The elastic film 1715 may be deformed during the movement of the guide portion 1712, so that the surface area of ​​the elastic film 1715 close to the suspended section 1331 may change. Specifically, two adjacent guide portions 1712 are defined as the fifth guide portion and the sixth guide portion. The fifth guide portion is closer to the mounting area 1163 than the sixth guide portion. When the guide member 171 is impacted by airflow, the sixth guide portion may deform relative to the fifth guide portion. Fig. 9 1331, the elastic film 1715 is arranged on the side of the guide member 171 close to the suspended section 1331, so the elastic film 1715 will be stretched, thereby increasing the surface area of ​​the elastic film 1715 close to the suspended section 1331, thereby improving the heat dissipation effect of the suspended section 1331. It can be understood that when the guide member 171 is provided with the elastic film 1715, the total guide surface 1713 of the guide member 171 is the surface of the elastic film 1715 close to the suspended section 1331.

[0071] In this embodiment, when the air guide member 171 is not impacted by the airflow, the provision of the elastic member 172 can reset the sixth air guide portion.

[0072] like Fig. 9As shown, as an implementation, a first limiting body 175 and a second limiting body 1163a are provided between the installation area 1163 and the air guide 171, the first limiting body 175 is provided on the air guide 171, and the second limiting body 1163a is provided on the installation area 1163. When the air guide 171 is impacted by the airflow, the end of the air guide 171 away from the installation area 1163 will rotate toward the side away from the suspended section 1331, so that the first limiting body 175 and the second limiting body 1163a are arranged closer to the suspended section 1331 than the rotation connection between the air guide 171 and the installation area 1163, so that the first limiting body 175 and the second limiting body 1163a can limit the air guide 171 from rotating toward the suspended section 1331, thereby preventing the air guide 171 from interfering with the normal operation of the suspended section 1331 or other components. In another implementation, the first limiter 175 is disposed on the installation area 1163, and the second limiter 1163a is disposed on the guide member 171. The specific effect is the same as the previous implementation, which can prevent the guide member 171 from interfering with the normal operation of the suspended section 1331 or other components.

[0073] In this embodiment, the elastic connecting member 173 has a tendency to drive the first limiting body 175 and the second limiting body 1163a to always abut against each other, that is, when the guide member 171 is not impacted by the airflow, the elastic connecting member 173 can keep the first limiting body 175 and the second limiting body 1163a in abutment with each other, so that the guide member 171 remains stable when not working.

[0074] As an implementation method, any plane perpendicular to the rotation center axis of the power input wheel 131 is defined as the longitudinal plane 101, the projection of the extension direction of the air outlet section 1711 in the longitudinal plane 101 is the first projection line, and the projection of the extension direction of the suspended section 1331 in the longitudinal plane 101 is the second projection line, that is, the projection of the preset straight line 1301 in the longitudinal plane 101 is the second projection line, and the angle α between the first projection line and the second projection line ranges from 0° to 60°. It should be noted that when the angle α between the first projection line and the second projection line is 60°, the guide member 171 is in a non-working state or is not impacted by the airflow, that is, the first stopper and the second stopper maintain abutting position. When the angle α between the first projection line and the second projection line ranges from 0° to 60°, the guide member 171 is impacted by the airflow, so that the area of ​​the total guide surface 1713 changes, thereby adjusting the heat dissipation effect on the suspended section 1331. In addition, the above-mentioned angle range can prevent the angle α between the first projection line and the second projection line from being too small, causing the airflow to be directly guided by the guide member 171 and transported to the air outlet 1161b, thereby preventing the airflow from being unable to be transported to the suspended section 1331, thereby improving the heat dissipation effect of the suspended section 1331; it can also prevent the angle α between the first projection line and the second projection line from being too large, causing the guide member 171 to interfere with the suspended section 1331 or other components, thereby allowing the suspended section 1331 or other components to work normally.

[0075] It should be noted that when the angle α between the first projection line and the second projection line is in the range of 0° to 10°, the guide member 171 can be considered to be in a working state, that is, the impact of the airflow will cause the guide member 171 to maintain the state in which the angle α between the first projection line and the second projection line is 0° to 10°. Within the above angle range, it is beneficial to extend the extension distance of the derived airflow, thereby facilitating the improvement of the heat dissipation effect of the suspended section 1331.

[0076] like Fig.10 As shown, as an implementation method, the present application also provides a motorcycle 200 using the above-mentioned power assembly 100, and the motorcycle 200 includes a frame 21 and a traveling assembly 22, and the power assembly 100 is at least partially connected to the frame 21 and is in transmission connection with the traveling assembly 22.

[0077] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A powertrain, comprising: An engine, the engine comprising a crankshaft and a crankcase, the crankshaft being supported by the crankcase; A speed change device, the speed change device comprises a gearbox and a speed change mechanism, the speed change mechanism is at least partially located in the gearbox, the gearbox is connected to the crankcase; the speed change mechanism comprises a power input wheel, a power output wheel and a wheel connection belt, the power input wheel and the power output wheel are rotatably connected in the gearbox, the power input wheel and the power output wheel are connected by the wheel connection belt; the power input wheel is connected to the crankshaft; The invention is characterized in that the wheel connection belt includes a suspended section, and the suspended section is located between the power input wheel and the power output wheel; the speed change device also includes a flow guide component located in the gearbox, the flow guide component is movably connected to the gearbox, the flow guide component is located on one side of the suspended section, and the flow guide component can guide at least part of the airflow in the gearbox to the suspended section; The guide assembly includes a guide member, an installation area is provided in the gearbox, and the guide member is movably connected to the installation area; an air outlet section is provided at the end of the guide member away from the installation area; when the guide member is impacted by airflow, the guide member can move relative to the gearbox, and along the extension direction of the suspended section, the distance between the air outlet section and the installation area can change.

2. The powertrain according to claim 1, characterized in that: The guide member includes a plurality of guide parts, which are movably connected in sequence; a guide windward surface is provided on a side of each guide part close to the suspended section, and the plurality of guide windward surfaces form a continuous total guide surface; when any two adjacent guide parts move relative to each other, the area of ​​the total guide surface can change.

3. The powertrain according to claim 2, characterized in that: The flow guide assembly includes an elastic member arranged on the flow guide member, and two ends of the elastic member are respectively connected to two different flow guide parts; the force of the elastic member acting on the flow guide member has a tendency to reduce the area of ​​the total flow guide surface.

4. The powertrain according to claim 2, characterized in that: The guide assembly includes an elastic connector, both ends of which are respectively connected to the gearbox and one of the guide parts; the force exerted by the elastic connector on the guide part has a tendency to reduce the area of ​​the total guide surface, and has a tendency to reduce the distance between the air outlet section and the installation area along the extension direction of the suspended section.

5. The powertrain according to claim 1, characterized in that: The guide assembly includes an elastic connector connected between the gearbox and the guide, and the force exerted by the elastic connector on the guide has a tendency to reduce the distance between the air outlet section and the installation area along the extension direction of the suspended section.

6. The powertrain according to claim 4 or 5, characterized in that: A first limiting body and a second limiting body are provided between the installation area and the guide member, the first limiting body is provided on the guide member, and the second limiting body is provided on the installation area; the elastic connecting member has a tendency to drive the first limiting body and the second limiting body to always abut against each other.

7. The powertrain according to claim 1, characterized in that: Any plane perpendicular to the central axis of rotation of the power input wheel is defined as a longitudinal plane, the projection of the extension direction of the air outlet section in the longitudinal plane is the first projection line, the projection of the extension direction of the suspended section in the longitudinal plane is the second projection line, and the angle between the first projection line and the second projection line ranges from 0° to 60°.

8. The powertrain according to claim 1, characterized in that: An arc-shaped air duct is formed between the speed change mechanism and the inner wall of the gearbox, an air outlet is arranged at one end of the arc-shaped air duct, and the connection position between the air guide component and the gearbox is arranged at the air outlet.

9. A motorcycle, characterized in that: The motorcycle comprises the power assembly according to any one of claims 1 to 8, and further comprises: Frame; A traveling assembly, the traveling assembly being connected to the frame and at least partially located below the frame; The power assembly is supported by the frame, and the power output wheel is transmission-connected to the travel assembly.

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