Engine

Abstract

The invention discloses an engine which comprises a crankcase internally provided with a cavity and a side cavity which are independent from each other, a continuously variable transmission and an air guide cavity which are arranged in the crankcase, an air inlet communicated with the air guide cavity, and an upper air outlet and a lower air outlet which are formed in the crankcase, the continuously variable transmission comprises a driving wheel assembly, a driven wheel assembly and a transmission part which are arranged in the cavity, and a transmission assembly located in the side cavity. The air guide cavity is defined by the inner side face of the crankcase cover and an air guide partition plate arranged on the inner side face of the crankcase cover. An air guide opening communicated with the air guide cavity is coaxially formed in the side, facing the driving wheel assembly, of the air guide cavity, the air guide opening is used for enabling the air guide cavity to be communicated with the cavity where the driving wheel assembly is located, and the driving wheel assembly and the driven wheel assembly are both arranged in the cavity; the air guide cavity is communicated with the air inlet through the ventilation opening, core components of the continuously variable transmission located in the cavity are cooled, heat dissipation is good, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycle parts, and in particular relates to an engine. Background Art

[0002] A transmission system is installed in the transmission chamber of a motorcycle engine, generally a CVT transmission system (continuously variable transmission) is used. However, the heat dissipation effect in the transmission chamber is not good, which can easily lead to poor heat dissipation of the continuously variable transmission and excessive internal temperature, affecting the stability of power transmission. It can also accelerate the wear or deformation of components and shorten the service life of the engine. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the present invention provides an engine.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] An engine, comprising:

[0006] A crankcase, wherein the crankcase has a chamber and a side chamber that are independent of each other, and the crankcase is provided with an air inlet that communicates with the interior of the chamber;

[0007] A continuously variable transmission, the continuously variable transmission comprising a driving wheel assembly, a driven wheel assembly and a transmission part arranged in the chamber, and a transmission assembly connected to the driving wheel assembly and the driven wheel assembly and located in the side chamber;

[0008] An air guide chamber is arranged on the inner side surface of the crankcase cover of the engine at a position corresponding to the driving wheel assembly, and the air guide chamber is surrounded by the inner side surface of the crankcase cover and an air guide baffle arranged thereon; an air guide port is coaxially arranged on the side of the air guide chamber facing the driving wheel assembly, and the air guide port is used to connect the air guide chamber with the chamber where the driving wheel assembly is located, and the driving wheel assembly and the driven wheel assembly are both arranged in the chamber; a vent connected to the air inlet is also arranged on the air guide chamber;

[0009] an upper air outlet, disposed on the crankcase near and above the driven wheel assembly, for allowing the gas arriving thereto to flow out of the chamber; and

[0010] The lower air outlet is arranged on the crankcase and located below the driven wheel assembly, and is used for allowing the gas arriving thereto to flow out of the chamber.

[0011] Furthermore, the engine also includes:

[0012] A first spiral air guide portion is arranged on the chamber and distributed around an outer edge of the driving wheel assembly away from the driven wheel assembly, and an input end of the first spiral air guide portion is located above the driving wheel assembly, and an output end of the first spiral air guide portion extends downward and toward the lower air outlet after extending around an outer edge of the driving wheel assembly away from the driven wheel assembly; the first spiral air guide portion guides a portion of the gas from the air guide port to the lower air outlet and a position on the driven wheel assembly close to the first spiral air guide portion, and a portion of the gas passing through the first spiral air guide portion flows out from the lower air outlet, and another portion flows toward the upper air outlet and flows out from the upper air outlet;

[0013] A second spiral air guide portion is arranged on a side of the air guide chamber facing the driving wheel assembly and distributed outside the outer edge of the driving wheel assembly away from the driven wheel assembly, one end of the second spiral air guide portion is located above the driving wheel assembly, and the other end faces the direction of the driven wheel assembly; the second spiral air guide portion guides another part of the gas from the air guide port to the driven wheel assembly;

[0014] The third spiral air guide portion is arranged on the chamber and is distributed around the outer edge of the driven wheel assembly away from the driving wheel assembly. The air inlet end of the third spiral air guide portion corresponds to the other end of the second spiral air guide portion, and the air outlet end of the third spiral air guide portion is close to the upper air outlet. The third spiral air guide portion is used to guide the gas from the second spiral air guide portion to the upper air outlet.

[0015] Furthermore, the crankcase is provided with an appendage for dividing the internal space of the crankcase into two parts to form the chamber and the side chamber, the chamber is formed between the appendage and the crankcase cover, the driving wheel part of the driving wheel assembly, the driven wheel part of the driven wheel assembly and the transmission part are all arranged in the chamber; the air inlet is arranged on the appendage and communicated with the chamber, the appendage is provided with an appendage air duct, one end of the appendage air duct is connected to the air inlet, and the other end is connected to the air guide chamber through the vent.

[0016] Furthermore, the appendage has a main wall arranged opposite to the crankcase cover and a peripheral wall extending from the peripheral edge of the main wall toward the crankcase cover, and the air inlet and upper air outlet are both arranged on the peripheral wall; the first spiral air guide portion and the third spiral air guide portion are arranged near the edge of the main wall.

[0017] Furthermore, the inner side surface of the crankcase cover has a groove opening toward the driving wheel assembly, and the air guide baffle is arranged at the opening of the groove to enclose it to form the air guide chamber; the ventilation port is arranged on the groove wall of the groove toward the upper end of the crankcase cover to communicate with the air inlet.

[0018] Furthermore, a portion of the groove wall away from the driven wheel assembly on the groove protrudes out of the air guide baffle toward the driving wheel assembly, and a portion of the groove wall protruding out of the air guide baffle is open toward the driven wheel assembly and close to the first spiral air guide portion.

[0019] Furthermore, a first slot is provided on the groove at the position of the vent, and the air guide baffle includes a plate body provided with the air guide port and a limiting portion fixed to the plate body, the plate body is detachably connected to the crankcase cover to cover the opening of the groove, and the limiting portion has a limiting ear corresponding to the position of the first slot and can be slidably assembled in the first slot.

[0020] Furthermore, the engine also includes an impeller, which is arranged on a side of the driving wheel assembly facing the wind guide baffle, and is used to increase the pressure and speed of the gas from the wind guide chamber.

[0021] Further, the driving wheel assembly includes an active driving disk and an active moving disk which are arranged in the chamber and spaced apart, and a crankshaft whose first section extends into the chamber and is axially connected to the active driving disk and the active moving disk, and a second section of the crankshaft is located in the side chamber;

[0022] The driven wheel assembly includes a driven drive disk and a driven moving disk which are arranged in the chamber and spaced apart from each other, and a secondary clutch shaft whose third section extends into the chamber and is axially connected to the driven drive disk and the driven moving disk, and whose fourth section is located in the side chamber;

[0023] The transmission part is a transmission belt sleeved on the crankshaft and the secondary clutch shaft, one end of which is located between the active driving disc and the active moving disc and the other end of which is located between the driven driving disc and the driven moving disc.

[0024] Further, the transmission assembly includes an oil pump driving gear and a balancing driving gear disposed in the side chamber and connected to the second section of the crankshaft, a crank connecting rod assembly located on one side of the balancing driving gear, a balancing shaft located on one side of the crankshaft, and a balancing driven gear disposed on the balancing shaft and meshing with the balancing driving gear; and

[0025] A clutch assembly disposed in the side chamber and connected to the fourth section of the secondary clutch shaft, a secondary driving gear disposed on one side of the clutch assembly, a countershaft connected to the crankcase and located on one side of the secondary driving gear, a countershaft gear axially connected to the countershaft, a main shaft connected to the crankcase and located on one side of the countershaft, a secondary driven gear axially connected to the mainshaft and meshing with the secondary driving gear, and a mainshaft gear disposed on one side of the secondary driven gear and meshing with the countershaft gear.

[0026] In summary, the beneficial effects of the present invention are as follows: 1. The crankcase is divided into independent chambers and side chambers, and the driving wheel part, the driven wheel part and the transmission belt of the core of the continuously variable transmission are placed in the chamber, while the remaining components such as the transmission assembly are installed in the side chamber, so that the internal structure layout of the engine is more reasonable and orderly, avoiding mutual interference and crowding between the components, making full use of the internal space, and making the entire engine structure more compact. 2. The cold air is introduced through the air inlet, guided by the air guide chamber, and heat exchanged and cooled to the driving wheel assembly, the driven wheel assembly and the transmission part, which can effectively take away the heat generated during the operation of the continuously variable transmission, prevent these key components from overheating and causing performance degradation, increased wear of parts and components, and even damage, and ensure the normal and reliable operation of the entire engine. 3. The first spiral air guide part is arranged on the outer edge of the driving wheel assembly, which can guide part of the gas entering the chamber in a targeted manner, first cool the driving wheel part, and then act on its outer edge area, and when running clockwise, some wind can also cool the driven wheel part close to the driving wheel part. The first spiral air guide strengthens the local heat exchange of the driving wheel, avoids local overheating, and fully guarantees the heat dissipation effect of the driving wheel assembly. The second spiral air guide can guide the wind to the driven wheel assembly to cool the driven wheel assembly, avoid local overheating and performance degradation caused by poor heat dissipation in the central area, and ensure the stable operation of the driven wheel assembly. The third spiral air guide can guide the gas on the outer edge of the driven wheel part to cool its outer heat exchange, and at the same time provide assistance for the heat dissipation of the inner side of the driving wheel part, further improving the overall heat dissipation effect. Fourth, the second spiral air guide is set using the groove wall structure of the groove on the crankcase cover, without the need to add a large number of complex components or occupy too much space, optimizing the layout of the air duct in the engine chamber, making the air duct system more compact, efficient and reasonable. Fifth, when the driving wheel assembly and the driven wheel assembly rotate, each spiral air guide guides the air flow in the chamber, promotes air convection between the upper and lower areas in the chamber, drives the air circulation in the entire chamber, strengthens the heat transfer and dissipation between different positions, helps to maintain the uniformity of the temperature in the chamber, and improves the overall heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an engine provided by the present invention.

[0028] Figure 2 It is the front view of the figure.

[0029] Figure 3 yes Figure 2 AA section view.

[0030] Figure 4 It is a cross-sectional view of the chamber in the present invention.

[0031] Figure 5 It is a three-dimensional structural schematic diagram of the engine of the present invention without the crankcase cover installed.

[0032] Figure 6 yes Figure 5 main view.

[0033] Figure 7 It is a structural schematic diagram of the crankcase cover in the present invention without an air guide baffle installed.

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the crankcase cover after the air guide baffle is installed in the present invention.

[0035] Fig. 9 yes Figure 8 main view.

[0036] Fig.10 It is a structural schematic diagram of the air guide baffle in the present invention.

[0037] Fig.11 yes Fig.10 sectional view of .

[0038] Fig.12 It is a three-dimensional structural schematic diagram of the continuously variable transmission in the present invention.

[0039] Fig.13 It is a cross-sectional view of the continuously variable transmission of the present invention.

[0040] In the figure, 100-crankcase, 110-air inlet pipe, 111-air inlet, 120-chamber, 121-first spiral air guide part, 122-third spiral air guide part, 130-appendage, 131-appendage air duct, 132-front wall, 133-circumferential wall, 134-air guide cover, 140-side chamber, 200-crankcase cover, 210-air guide baffle, 211-plate body, 2110-air guide port, 212-limiting part, 2120-limiting ear, 220-air guide chamber, 221-ventilation port, 230-groove, 240-second spiral air guide part, 250-first slot, 260-second slot, 300-driving wheel assembly, 31 0-active driving disc, 311-blade, 320-active moving disc, 330-crankshaft, 400-driven wheel assembly, 410-driven driving disc, 420-driven moving disc, 430-secondary clutch shaft, 500-lower air outlet plate, 510-lower air outlet, 600-transmission belt, 700-transmission assembly, 710-oil pump driving gear, 720-balance driving gear, 730-crank-connecting rod assembly, 740-balance shaft, 741-balance driven gear, 750-clutch assembly, 760-secondary driving gear, 770-countershaft, 780-countershaft gear, 790-main shaft, 791-secondary driven gear, 792-main shaft gear. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with specific drawings.

[0042] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 The present invention provides an engine, a crankcase 100, a continuously variable transmission and an air guide chamber arranged in the crankcase 100, and an upper air outlet and a lower air outlet. The crankcase has a chamber 120 and a side chamber 140 that are independent of each other, and the crankcase 100 is provided with an air inlet 111 that communicates with the interior of the chamber 120. The continuously variable transmission includes a driving wheel assembly 300, a driven wheel assembly 400 and a transmission part arranged in the chamber 120, and a transmission assembly 700 connected to the driving wheel assembly 300 and the driven wheel assembly 400 and located in the side chamber 140. The air guide chamber 220 is arranged on the inner side surface of the crankcase cover 200 of the engine at a position corresponding to the driving wheel assembly 300, and the air guide chamber 220 is enclosed by the inner side surface of the crankcase cover 200 and the air guide baffle 210 arranged thereon. The air guide chamber 220 is coaxially provided with an air guide port 2110 on one side facing the driving wheel assembly 300, and the air guide port 2110 is used to connect the air guide chamber 220 with the chamber 120 where the driving wheel assembly 300 is located, and the driving wheel assembly 300 and the driven wheel assembly 400 are both arranged in the chamber 120. The air guide chamber 220 is also provided with a vent 221 connected with the air inlet 111.

[0043] The upper air outlet is arranged on the crankcase 100 near and above the driven wheel assembly 400, and is used for allowing the gas arriving here to flow out of the chamber 120. The lower air outlet 510 is arranged on the crankcase 100 and below the driven wheel assembly 400, and is used for allowing the gas arriving here to flow out of the chamber 120. It can be understood by those skilled in the art that the terms "above" and "below" can refer to directly above, directly below, obliquely above, and obliquely below the driven wheel assembly 400. In this embodiment, the upper air outlet is arranged obliquely above the driven wheel assembly 400 (obliquely away from the driving wheel assembly 300), and the lower air outlet 510 is arranged obliquely below the driven wheel assembly 400 (obliquely away from the driving wheel assembly 300). Specifically, an air guide cover 134 is provided at the upper air outlet and is connected thereto. The air guide cover 134 has a lateral opening and is used to redirect the air from the upper air outlet so that the air flows out laterally from the opening on one side of the air guide cover 134. This prevents the hot air from the upper air outlet from blowing directly upwards to the rider, thereby affecting the riding experience of the entire vehicle.

[0044] The cold air outside the crankcase 100 is guided by the air inlet 111 through the air guide chamber 220, enters the chamber 120 from the air guide port 2110 and performs heat exchange and cooling on the driving wheel assembly 300. As the driving wheel assembly 300 and the driven wheel assembly 400 rotate, the cold air at the air guide port 2110 flows to the top and bottom of the driven wheel assembly 400 respectively, and then flows out from the corresponding air outlet. In this way, the heat generated by the driving wheel assembly 300 and the driven wheel assembly 400 during operation can be effectively taken away, and the performance degradation, increased wear and even damage of parts due to overheating can be prevented, thereby ensuring the normal and reliable operation of the entire continuously variable transmission, and also helping to maintain the engine as a whole in a suitable operating temperature range, thereby extending the service life of the engine.

[0045] Please continue reading Figure 3The crankcase 100 is provided with an appendage 130, which is used to divide the internal space of the crankcase 100 into two to form a chamber 120 and a side chamber 140 that are independent of each other. The appendage 130 is located between the crankcase 100 and the crankcase cover 200 and is screwed to the crankcase 100 and the crankcase cover 200. The screwed crankcase 100, the appendage 130 and the crankcase cover 200 are easy to disassemble and assemble, and are easy to replace and repair when the parts are worn. A chamber 120 is formed between the appendage 130 and the crankcase cover 200, and the driving wheel part of the driving wheel assembly 300, the driven wheel part of the driven wheel assembly 400 and the transmission part are all arranged in the chamber 120. In this way, components that are in operation for a long time can be arranged in an independent chamber 120. By introducing external cold air into the chamber 120 through the air inlet 111, the driving wheel part, the driven wheel part and the transmission part in the chamber 120 can be effectively dissipated and a good air environment can be created, thereby ensuring the transmission accuracy and transmission efficiency of the driving wheel part, the driven wheel part and the transmission part.

[0046] See also Figure 5 and Figure 6 The appendage 130 has a front wall 132 disposed opposite to the crankcase cover 200 and a peripheral wall 133 extending from the periphery of the front wall 132 toward the crankcase cover 200. The air inlet 111 and the upper air outlet mentioned above are both disposed on the peripheral wall 133. The first spiral air guide portion 121 (the dotted line B portion) and the third spiral air guide portion 122 (the dotted line C portion) are disposed near the edge of the front wall 132. The first spiral air guide portion 121 and the third spiral air guide portion 122 cooperate with the crankcase 100 to guide air.

[0047] The appendage 130 is provided with an air inlet pipe 110, and the port of the air inlet pipe 110 is defined as an air inlet 111 connected to the chamber 120. The appendage 130 is provided with an appendage air duct 131, one end of which is connected to the air inlet 111, and the other end is connected to the air guide chamber 220 through the vent 221. The appendage air duct 131 can provide a clear and fixed flow path for the incoming cold air, so that the cold air entering from the outside can pass through the air inlet 111, the appendage air duct 131, and the vent 221 in sequence according to the pre-designed route, and finally reach the air guide chamber 220, and then flow to the chamber 120 where the driving wheel part, the driven wheel part and the transmission part are located. In this way, the cold air can be accurately delivered to the key parts where heat dissipation is required, avoiding the situation where the air flow is disordered, dispersed or cannot effectively reach the target area, improving the pertinence and effectiveness of ventilation and heat dissipation, and ensuring efficient heat exchange and cooling of important components such as the driving wheel and the driven wheel.

[0048] Please continue reading Figure 6The air duct of the engine further includes a first spiral air guide portion 121, a second spiral air guide portion 240 and a third spiral air guide portion 122. The first spiral air guide portion 121 is arranged on the chamber 120 and distributed around the outer edge of the driving wheel assembly 300 away from the driven wheel assembly 400, and the input end of the first spiral air guide portion 121 is located above the driving wheel assembly 300. The output end of the first spiral air guide portion 121 extends downward and toward the lower air outlet 510 after being around the outer edge of the driving wheel assembly 300 away from the driven wheel assembly 400, and the spacing between the first spiral air guide portion 121 and the driving wheel portion gradually increases from the input end to the output end. The wind pressure is higher at the position with a narrower spacing, and the pressure is lower at the position with a larger spacing. Therefore, when the driving wheel portion rotates clockwise, the air is more likely to flow from the high-pressure area to the low-pressure area, and it is more convenient for the wind to flow out from the air outlet.

[0049] The first spiral air guide portion 121 guides a portion of the gas from the air guide port 2110 to the lower air outlet 510 and the position of the driven wheel assembly 400 close to the first spiral air guide portion 121. The first spiral air guide portion 121 is arranged on the outer edge of the driving wheel assembly 300 away from the driven wheel assembly 400. It can carry out targeted diversion of a portion of the gas entering the chamber 120 from the air guide port 2110, so that this portion of cold air is actually first aimed at the driving wheel part to cool down, and then directly acts on the outer edge area of ​​the side of the driving wheel part, which can enhance the local heat exchange of the driving wheel part and avoid local overheating of this part due to poor heat dissipation, thereby more comprehensively ensuring the overall heat dissipation effect of the driving wheel assembly 300 and maintaining its good working condition.

[0050] Please continue reading Figure 6When the driving wheel assembly 300 is working, it rotates in the clockwise direction. A part of the gas passing through the first spiral air guide 121 flows out from the lower air outlet 510, and the other part flows to the upper air outlet and flows out from the upper air outlet. This process promotes the air convection between the upper and lower areas in the chamber 120, drives the circulation of air in the entire chamber 120, strengthens the transfer and dissipation of heat between different positions, helps to maintain the uniformity of the temperature in the chamber 120, and improves the overall heat dissipation performance and the wind flowing out from the upper air outlet. The first spiral air guide portion 121 can guide the gas to the third spiral air guide portion 122 close to the driven wheel assembly 400. After being guided by the third spiral air guide portion 122, the gas can flow out from the upper air outlet, and the wind also dissipates the heat at the position close to the driving wheel part of the driven wheel assembly 400 (i.e., the inner side of the driven wheel assembly 400, close to the driving wheel assembly), providing additional assistance for the heat dissipation of the driven wheel assembly 400. The cold air guided by the first spiral air guide portion 121 can further enhance the cooling effect on the corresponding position of the driven wheel assembly 400, more comprehensively guaranteeing the heat dissipation of the driven wheel assembly 400, and ensuring that it will not affect the transmission efficiency and accuracy due to overheating during long-term operation.

[0051] Please continue reading Figure 4 , the driving wheel assembly 300 is provided with an impeller on one side facing the wind guide baffle 210, which is used to increase the pressure and speed of the gas from the wind guide chamber 220. The impeller includes a plurality of blades 311 distributed around the center of the impeller, and each blade 311 is curved in a clockwise arc shape, which can accelerate the gas from the wind guide chamber 220 to the first spiral wind guide portion 121 and the second spiral wind guide portion 240. When the engine is working, the impeller rotates clockwise and fans from the center of the impeller to the outer edge, forcibly increasing the pressure and speed of the cold air entering through the air guide port 2110, so that the flow rate of the cold air is significantly increased, and the high-speed flowing cold air can pass through the surfaces of the components that need heat dissipation, such as the driving wheel assembly 300, the driven wheel assembly 400 and the transmission part, more quickly, and the number of contacts with these heat-generating components per unit time is increased, thereby strengthening the heat exchange process.

[0052] The second spiral air guide portion 240 is disposed on a side of the air guide chamber 220 facing the driving wheel assembly 300, and the second spiral air guide portion 240 is located outside the outer edge of the driving wheel assembly 300 away from the driven wheel assembly 400. One end of the second spiral air guide portion 240 is located above the driving wheel assembly 300, and the other end faces the driven wheel assembly 400. The distance between the second spiral air guide portion 240 and the center of the air guide port 2110 gradually increases from the one end to the other end, and the effect of the gradually increasing distance is the same as that of the first spiral air guide portion 121. The second spiral air guide 240 guides another part of the gas from the air guide port 2110 to the driven wheel assembly 400. The function of the second spiral air guide 240 is to guide the wind from the air guide port 2110 to the driven wheel assembly 400 in an orderly manner. The cold air can directly act on the core area of ​​the driven wheel assembly 400 to achieve targeted cooling of the driven wheel assembly 400, strengthen the heat dissipation effect of the driven wheel part, avoid local overheating and performance degradation of the entire driven wheel assembly 400 due to poor heat dissipation in the central area, and ensure the stable operation of the driven wheel assembly 400. After the driven wheel assembly 400 rotates clockwise, the wind is guided to flow out from the lower air outlet 510. At the same time, there is wind that reaches the third spiral air guide 122 and is guided to flow out from the upper air outlet.

[0053] See also Figure 7 and Figure 8 The inner side surface of the crankcase cover 200 has a groove 230 with an opening toward the driving wheel assembly 300, and the air guide baffle 210 is arranged at the opening of the groove 230 to enclose the groove 230 to form an air guide chamber 220. The vent 221 is arranged on the groove wall of the groove 230 toward the upper end of the crankcase cover 200 to communicate with the air inlet 111. The groove wall of the groove 230 that is away from the driven wheel assembly 400 protrudes out of the air guide baffle 210 in the direction of the driving wheel assembly 300, and the groove wall that protrudes out of the air guide baffle 210 is opened toward the driven wheel assembly 400 and close to the first spiral air guide portion 121. The second spiral air guide 240 is set by using the groove wall structure of the groove 230 on the crankcase cover 200, and the part protruding from the air guide baffle 210 is used as the second spiral air guide 240. This cleverly combines the existing structure for design, and can effectively guide the airflow coming out of the air guide port 2110 without adding a large number of additional complex components or occupying too much space, thereby optimizing the layout of the air duct in the entire engine chamber 120, making the air duct system more compact, efficient and reasonable. In addition, by accurately guiding the wind to the driven wheel assembly 400, the heat dissipation effect of the driven wheel part is enhanced.

[0054] After the engine is started, the driving wheel part will always rotate with the engine, so the wind flowing out of the air guide port 2110 can be guided to the driven wheel part very quickly.

[0055] See also Figure 7 A first slot 250 is provided on the groove 230 at the position of the vent 221, see Fig.10 and Fig.11 The air guide baffle 210 includes a plate body 211 provided with an air guide port 2110 and a limiting portion 212 fixedly connected to the plate body 211. The plate body 211 is detachably connected to the crankcase cover 200 to cover the opening of the groove 230. The limiting portion 212 has a limiting lug 2120 corresponding to the position of the first slot 250 and capable of being slidably assembled in the first slot 250. After the limiting lug 2120 is installed in the corresponding first slot 250, the air guide baffle 210 can be preliminarily positioned. In order to make the air guide baffle 210 more stable, the plate body 211 is also screwed to the crankcase cover 200 by bolts. The air guide baffle 210 connected in this way is easy to install and easy to disassemble and repair.

[0056] See also Figure 8 and Fig. 9 The side wall of the crankcase cover 200 is provided with a notch communicating with the interior, and a second slot 260 is provided at the edge of the notch, a lower air outlet plate 500 is inserted into the second slot 260, and a plurality of lower air outlets 510 are provided on the lower air outlet plate 500. The lower air outlets 510 can be located directly below or obliquely below the driven wheel portion.

[0057] The third spiral air guide 122 is arranged on the chamber 120 and distributed around the outer edge of the driven wheel assembly 400 away from the driving wheel assembly 300. The air inlet end of the third spiral air guide 122 corresponds to the other end of the second spiral air guide 240, and the air outlet end of the third spiral air guide 122 is close to the upper air outlet. The third spiral air guide 122 is used to guide the gas from the second spiral air guide 240 to the upper air outlet. The distance between the third spiral air guide 122 and the center of the driven wheel assembly gradually increases from the air inlet end to the air outlet end. As the engine starts, the driven wheel assembly 400 rotates clockwise, and the third spiral air guide 122 guides the gas on the outer edge of the driven wheel part to the upper air outlet, so as to perform heat exchange and cooling for the outer side of the driven wheel part. The driven wheel assembly 400 rotates clockwise, and the wind is also guided to the first spiral air guide 121, and then the wind is guided by the first spiral air guide 121 to be led out from the lower air outlet 510. During the clockwise rotation, a small amount of wind will be diverted to the position of the driving wheel part close to itself (i.e. the inner side of the driving wheel part, close to the position of the driven wheel part), and finally this part of wind flows out from the lower air outlet 510, which can also perform heat exchange and cooling on the inner side of the driving wheel part.

[0058] Please refer to Fig.12The driving wheel assembly 300 includes an active driving disk 310 and an active moving disk 320 disposed in the chamber 120 and arranged at intervals, and a crankshaft 330 having a first section extending into the chamber 120 and axially connected to the active driving disk 310 and the active moving disk 320, and a second section of the crankshaft 330 is located in the side chamber 140. The driving wheel driving disk is the impeller mentioned above, and the active driving disk 310, the active moving disk 320 and the first section of the crankshaft 330 are defined as the driving wheel part. The driven wheel assembly 400 includes a driven driving disk 410 and a driven moving disk 420 disposed in the chamber 120 and arranged at intervals, and a secondary clutch shaft 430 having a third section extending into the chamber 120 and axially connected to the driven driving disk 410 and the driven moving disk 420, and a fourth section of the secondary clutch shaft 430 is located in the side chamber 140. The driven drive disc 410, the driven moving disc 420 and the third section of the secondary clutch shaft 430 are defined as the driven wheel portion. The transmission portion is a transmission belt 600 sleeved on the crankshaft 330 and the secondary clutch shaft 430, one end of which is located between the active drive disc 310 and the active moving disc 320 and the other end of which is located between the driven drive disc 410 and the driven moving disc 420. The transmission belt 600 is preferably a steel belt.

[0059] With the above structure, the independent chamber 120 can effectively dissipate heat for the active wheel part (including active drive disk 310, active movable disk 320, etc.), the driven wheel part (including driven drive disk 410, driven movable disk 420, etc.) and the transmission belt 600 in the chamber 120, which are in operation for a long time, by introducing cold air from the outside through the air inlet 111. The cold air can be accurately delivered to these key parts to avoid disordered, scattered airflow or the inability to effectively reach the target area, thereby improving the pertinence and effectiveness of ventilation and heat dissipation, ensuring efficient heat exchange and cooling, and preventing performance degradation due to overheating. Avoid poor heat dissipation of the continuously variable transmission, which affects the stability of power transmission. After the engine is installed on the motorcycle, the driving wheel part is close to the front of the motorcycle. During driving, with the driving direction of the motorcycle as a reference, the air inlet 111 is forward (i.e., close to the front of the motorcycle), which is convenient for the oncoming wind to enter the air inlet 111 more quickly during driving, and the two air outlets are close to the position of the driven wheel part (i.e., away from the front of the motorcycle). Therefore, the engine cooling air circulates in the engine in a forward-to-back manner. The advantage of this is that during driving, the oncoming wind can take away the hot air at the two air outlets, avoiding the hot air from being discharged to the driver and affecting the driving comfort.

[0060] Please refer to Fig.13The transmission assembly 700 includes an oil pump driving gear 710 and a balance driving gear 720 disposed in the side chamber 140 and connected to the second section of the crankshaft 330, a crank connecting rod assembly 730 located on one side of the balance driving gear 720, a balance shaft 740 located on one side of the crankshaft 330, and a balance driven gear 741 disposed on the balance shaft 740 and meshing with the balance driving gear 720, a clutch assembly 750 disposed in the side chamber 140 and connected to the fourth section of the secondary clutch shaft 430, a secondary driving gear 760 disposed on one side of the clutch assembly 750, a countershaft 770 connected to the crankcase 100 and located on one side of the secondary driving gear 760, a countershaft gear 780 axially connected to the countershaft 770, and a countershaft gear 790 connected to the crankcase 100. The main shaft 790 connected to the axle box 100 and located on one side of the secondary shaft 770, the secondary driven gear 791 connected to the main shaft 790 and meshing with the secondary driving gear 760, and the main shaft gear 792 located on one side of the secondary driven gear 791 and meshing with the secondary shaft 770, the crank-connecting rod assembly 730 and the balance shaft 740, the balance driving gear 720, the balance driven gear 741 and other components in the transmission component 700 help to maintain the balance of the engine during operation, offset or reduce the unbalanced force generated by the high-speed movement of each component, reduce the vibration of the engine, improve the driving comfort, and also help to extend the service life of each engine component and ensure the reliability and durability of the entire engine system. The driving wheel, driven wheel and conveyor belt of the CVT core are located in the chamber 120, while the other components are installed in the side chamber 140, isolating the transmission assembly 700 from the chamber 120 where the driving wheel, driven wheel and conveyor belt are located, reducing the impact of vibration and heat generated by the transmission assembly 700 during operation on the key components of the CVT core such as the driving wheel, driven wheel and transmission belt 600. In addition, the independent space is convenient for maintenance and repair of parts, and there is no need to search and handle them in a complex and mixed component space, which can improve maintenance efficiency and reduce maintenance difficulty and cost.

[0061] This engine: 1. The crankcase 100 is divided into independent chambers 120 and side chambers 140. The driving wheel part, driven wheel part and transmission belt 600 of the core of the continuously variable transmission are placed in the chamber 120, while the transmission assembly 700 and other components are installed in the side chamber 140, so that the internal structure layout of the engine is more reasonable and orderly, avoiding mutual interference and crowding between the components, making full use of the internal space, and making the entire engine structure more compact. 2. The cold air is introduced through the air inlet 111, guided by the air guide chamber 220, and heat exchanged and cooled with the driving wheel assembly 300, the driven wheel assembly 400 and the transmission part, which can effectively take away the heat generated during the operation of the continuously variable transmission, prevent these key components from overheating and causing performance degradation, increased wear and even damage of parts, and ensure the normal and reliable operation of the entire engine. 3. The first spiral air guide portion 121 is arranged at the outer edge of the driving wheel assembly 300, and can specifically guide part of the gas entering the chamber 120, first cooling the driving wheel part, and then acting on its outer edge area. When running clockwise, part of the wind can also cool the driven wheel part close to the driving wheel part. The first spiral air guide portion 121 strengthens the local heat exchange of the driving wheel, avoids local overheating, and fully guarantees the heat dissipation effect of the driving wheel assembly 300. The second spiral air guide portion 240 can guide the wind to the driven wheel assembly 400 to cool the driven wheel assembly 400, avoid local overheating and performance degradation caused by poor heat dissipation in the central area, and ensure the stable operation of the driven wheel assembly 400. The third spiral air guide portion 122 can guide the gas at the outer edge of the driven wheel part to cool its outer heat exchange, and at the same time can also provide assistance for the heat dissipation of the inner side of the driving wheel part, further improving the overall heat dissipation effect. Fourth, the second spiral air guide 240 is set by using the groove wall structure of the groove 230 on the crankcase cover 200, without adding a large number of complex components or occupying too much space, optimizing the layout of the air duct in the engine chamber 120, making the air duct system more compact, efficient and reasonable. Fifth, when the driving wheel assembly 300 and the driven wheel assembly 400 rotate, each spiral air guide guides the air flow in the chamber 120, promotes air convection between the upper and lower areas in the chamber 120, drives the air circulation in the entire chamber 120, strengthens the heat transfer and dissipation between different positions, helps to maintain the uniformity of the temperature in the chamber 120, and improves the overall heat dissipation performance.

[0062] The above are only implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention's specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. An engine, characterized in that: include: A crankcase, wherein the crankcase has a chamber and a side chamber that are independent of each other, and the crankcase is provided with an air inlet that communicates with the interior of the chamber; A continuously variable transmission, the continuously variable transmission comprising a driving wheel assembly, a driven wheel assembly and a transmission part arranged in the chamber, and a transmission assembly connected to the driving wheel assembly and the driven wheel assembly and located in the side chamber; An air guide chamber is arranged on the inner side surface of the crankcase cover of the engine at a position corresponding to the driving wheel assembly, and the air guide chamber is surrounded by the inner side surface of the crankcase cover and an air guide baffle arranged thereon; an air guide port is coaxially arranged on the side of the air guide chamber facing the driving wheel assembly, and the air guide port is used to connect the air guide chamber with the chamber where the driving wheel assembly is located, and the driving wheel assembly and the driven wheel assembly are both arranged in the chamber; a vent connected to the air inlet is also arranged on the air guide chamber; an upper air outlet, disposed on the crankcase near and above the driven wheel assembly, for allowing the gas arriving thereto to flow out of the chamber; and The lower air outlet is arranged on the crankcase and located below the driven wheel assembly, and is used for allowing the gas arriving thereto to flow out of the chamber.

2. The engine according to claim 1, characterized in that Also includes: A first spiral air guide portion is arranged on the chamber and distributed around an outer edge of the driving wheel assembly away from the driven wheel assembly, and an input end of the first spiral air guide portion is located above the driving wheel assembly, and an output end of the first spiral air guide portion extends downward and toward the lower air outlet after extending around an outer edge of the driving wheel assembly away from the driven wheel assembly; the first spiral air guide portion guides a portion of the gas from the air guide port to the lower air outlet and a position on the driven wheel assembly close to the first spiral air guide portion, and a portion of the gas passing through the first spiral air guide portion flows out from the lower air outlet, and another portion flows toward the upper air outlet and flows out from the upper air outlet; A second spiral air guide portion is arranged on a side of the air guide chamber facing the driving wheel assembly and distributed outside the outer edge of the driving wheel assembly away from the driven wheel assembly, one end of the second spiral air guide portion is located above the driving wheel assembly, and the other end faces the direction of the driven wheel assembly; the second spiral air guide portion guides another part of the gas from the air guide port to the driven wheel assembly; The third spiral air guide portion is arranged on the chamber and is distributed around the outer edge of the driven wheel assembly away from the driving wheel assembly. The air inlet end of the third spiral air guide portion corresponds to the other end of the second spiral air guide portion, and the air outlet end of the third spiral air guide portion is close to the upper air outlet. The third spiral air guide portion is used to guide the gas from the second spiral air guide portion to the upper air outlet.

3. The engine according to claim 2, characterized in that: The crankcase is provided with an appendage for dividing the internal space of the crankcase into two parts to form the chamber and the side chamber. The chamber is formed between the appendage and the crankcase cover. The driving wheel part of the driving wheel assembly, the driven wheel part of the driven wheel assembly and the transmission part are all arranged in the chamber; the air inlet is arranged on the appendage and communicated with the chamber, and the appendage is provided with an appendage air duct, one end of the appendage air duct is connected with the air inlet, and the other end is connected with the air guide chamber through the vent.

4. The engine according to claim 3, characterized in that: The appendage has a main wall arranged opposite to the crankcase cover and a peripheral wall extending from the peripheral edge of the main wall toward the crankcase cover, and the air inlet and upper air outlet are both arranged on the peripheral wall; the first spiral air guide portion and the third spiral air guide portion are arranged near the edge of the main wall.

5. The engine according to claim 3, characterized in that: The inner side surface of the crankcase cover has a groove opening toward the driving wheel assembly, and the air guide baffle is arranged at the opening of the groove to enclose it to form the air guide chamber; the ventilation port is arranged on the groove wall of the groove toward the upper end of the crankcase cover to communicate with the air inlet.

6. The engine according to claim 5, characterized in that: A portion of the groove wall away from the driven wheel assembly on the groove protrudes out of the air guide baffle toward the driving wheel assembly, and a portion of the groove wall protruding out of the air guide baffle opens toward the driven wheel assembly and is close to the first spiral air guide portion.

7. The engine according to claim 5, characterized in that: A first slot is provided on the groove at the position of the vent, and the air guide baffle includes a plate body provided with the air guide port and a limiting portion fixed to the plate body, the plate body is detachably connected to the crankcase cover to cover the opening of the groove, and the limiting portion has a limiting ear corresponding to the position of the first slot and capable of being slidably assembled in the first slot.

8. The engine according to any one of claims 1 to 7, characterized in that: It also includes an impeller, which is arranged on a side of the driving wheel assembly facing the wind guide baffle and is used to increase the pressure and speed of the gas from the wind guide chamber.

9. The engine according to any one of claims 1 to 7, characterized in that: The driving wheel assembly includes an active driving disk and an active moving disk which are arranged in the chamber and spaced apart from each other, and a crankshaft whose first section extends into the chamber and is axially connected to the active driving disk and the active moving disk, and whose second section is located in the side chamber; The driven wheel assembly includes a driven drive disk and a driven moving disk which are arranged in the chamber and spaced apart from each other, and a secondary clutch shaft whose third section extends into the chamber and is axially connected to the driven drive disk and the driven moving disk, and whose fourth section is located in the side chamber; The transmission part is a transmission belt sleeved on the crankshaft and the secondary clutch shaft, one end of which is located between the active driving disc and the active moving disc and the other end of which is located between the driven driving disc and the driven moving disc.

10. The engine according to claim 9, characterized in that: The transmission assembly includes an oil pump driving gear and a balancing driving gear disposed in the side chamber and connected to the second section of the crankshaft, a crank connecting rod assembly located on one side of the balancing driving gear, a balancing shaft located on one side of the crankshaft, and a balancing driven gear disposed on the balancing shaft and meshing with the balancing driving gear; as well as A clutch assembly disposed in the side chamber and connected to the fourth section of the secondary clutch shaft, a secondary driving gear disposed on one side of the clutch assembly, a countershaft connected to the crankcase and located on one side of the secondary driving gear, a countershaft gear axially connected to the countershaft, a main shaft connected to the crankcase and located on one side of the countershaft, a secondary driven gear axially connected to the mainshaft and meshing with the secondary driving gear, and a mainshaft gear disposed on one side of the secondary driven gear and meshing with the countershaft gear.

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