Engine air duct

Abstract

The invention discloses an engine air duct which comprises an air inlet pipe arranged on a crankcase of an engine and provided with an air inlet, an air guide cavity formed in the position, corresponding to a driving wheel assembly, of the inner side face of a crankcase cover of the engine, an upper air outlet and a lower air outlet. 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 is coaxially formed in the side, facing the driving wheel assembly, of the air guide cavity, the air guide opening is used for communicating the air guide cavity 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; a ventilation opening communicated with the air inlet is further formed in the air guide cavity; the upper air outlet is formed in the crankcase and is close to and located above the driven wheel assembly, the lower air outlet is formed in the crankcase and located below the driven wheel assembly, and cold air at the air guide opening can be aligned with the driving wheel assembly for cooling and can flow to the upper portion and the lower portion of the driven wheel assembly correspondingly. And heat generated in the operation process of the engine in the cavity is effectively taken away.

Description

Technical Field

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

[0002] The crankcase is an indispensable part of the overall structure of a motorcycle engine. The engine's power system is prone to high internal temperatures due to poor heat dissipation during operation. If the components are at the extreme operating temperature they can withstand for a long time, it is easy to cause wear or breakage of the components, thereby reducing 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 air duct.

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

[0005] An engine air duct, comprising:

[0006] An air inlet pipe is arranged on the crankcase of the engine, and one end of the air inlet pipe is provided with an air inlet port communicating with the outside of the crankcase;

[0007] 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;

[0008] 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

[0009] 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.

[0010] Furthermore, the engine air duct also includes a first spiral air guide portion, which is arranged on the chamber and distributed around the outer edge of the driving wheel assembly away from the driven wheel assembly, and the input end of the first spiral air guide portion is located above the driving wheel assembly, and the output end of the first spiral air guide portion extends downward and toward the lower air outlet after extending around the 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 the other portion flows toward the upper air outlet and flows out from the upper air outlet;

[0011] A second spiral air guide portion is arranged on a side of the air guide chamber facing the driving wheel assembly and is 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 is facing 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.

[0012] Furthermore, the engine air duct also includes a third spiral air guide portion arranged on the chamber and 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, and the third spiral air guide portion is used to guide the gas from the second spiral air guide portion to the upper air outlet.

[0013] Furthermore, the crankcase is provided with an appendage for dividing the internal space of the crankcase into two parts, and the chamber is formed between the appendage and the crankcase cover, and 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 to the air inlet, and the other end is connected to the air guide chamber through the vent.

[0014] 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.

[0015] Furthermore, an air guide cover connected to the upper air outlet is provided, and the air guide cover has a side opening, and the air guide cover is used to change the direction of the gas from the upper air outlet so that the gas flows out laterally from the side opening of the air guide cover.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] Furthermore, the air duct of the engine also includes an impeller, which is arranged on a side of the driving wheel assembly facing the air guide baffle, and is used to increase the pressure and speed of the gas from the air guide chamber.

[0020] In summary, the beneficial effects of the present invention are as follows: 1. Cold air is introduced through the air inlet, guided through the air guide chamber, and heat exchanged and cooled the driving wheel assembly, the driven wheel assembly and the transmission part, which can effectively take away the heat generated during operation, prevent these key components from overheating and causing performance degradation, increased wear of parts and components, and even damage, thereby ensuring the normal and reliable operation of the entire engine. 2. The first spiral air guide is arranged at the outer edge of the driving wheel assembly, which can specifically guide part of the gas entering the chamber, 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 center of the driven wheel assembly, realize targeted cooling of the core area of ​​the driven wheel assembly, avoid local overheating and performance degradation caused by poor heat dissipation in the central area, and ensure stable operation of the driven wheel assembly. The third spiral air guide can guide the gas at the outer edge of the driven wheel part to cool down the outer side due to 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. 3. The second spiral air guide is set up 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, which optimizes the layout of the air duct in the engine chamber and makes the air duct system more compact, efficient and reasonable. 4. 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 temperature in the chamber, and improves the overall heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an engine air duct provided by the present invention.

[0022] Figure 2 It is the front view of the figure.

[0023] Figure 3 yes Figure 2 AA section view.

[0024] Figure 4 It is a cross-sectional view of the chamber in the present invention.

[0025] Figure 5 It is a three-dimensional structural schematic diagram of the engine of the present invention without the crankcase cover installed.

[0026] Figure 6 yes Figure 5 main view.

[0027] Figure 7It is a structural schematic diagram of the crankcase cover in the present invention without an air guide baffle installed.

[0028] 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.

[0029] Fig. 9 yes Figure 8 main view.

[0030] Fig.10 It is a structural schematic diagram of the air guide baffle in the present invention.

[0031] Fig.11 yes Fig.10 sectional view of .

[0032] 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-peripheral wall, 134-air guide cover, 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-vent, 230-groove, 240-second spiral air guide part, 250-first slot, 260-second slot, 300-driving wheel assembly, 310-impeller, 311-blade, 400-driven wheel assembly, 500-lower air outlet plate, 510-lower air outlet. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific drawings.

[0034] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6The present invention provides an engine air duct, including an air inlet pipe 110, an air guide chamber 220, an upper air outlet and a lower air outlet 510 arranged on the crankcase 100 of the engine. One end of the air inlet pipe 110 is provided with an air inlet 111 communicating with the outside of the crankcase 100, and the other end is communicated with the air guide chamber 220. 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 surrounded by the inner side surface of the crankcase cover 200 and the air guide baffle 210 arranged thereon. An air guide port 2110 is coaxially arranged on one side of the air guide chamber 220 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 ventilation port 221 communicating with the air inlet 111 .

[0035] 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.

[0036] 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 transmission system, and also helping to maintain the engine as a whole in a suitable operating temperature range, thereby extending the service life of the engine.

[0037] Please continue reading Figure 3 The crankcase 100 is provided with an appendage 130, and the appendage 130 is used to divide the internal space of the crankcase 100 into two. 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 convenient for disassembly and assembly, and are convenient for replacement and maintenance 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Please continue reading Figure 4 , the side of the driving wheel assembly 300 facing the wind guide baffle 200 is provided with an impeller 310 distributed in a clockwise direction, which is used to increase the pressure and speed of the gas from the wind guide chamber 220. The impeller 310 includes a plurality of blades 311 distributed around the center of the impeller 310, each of which is curved in the clockwise direction, and 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 310 rotates clockwise and fans from the center of the impeller 310 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, increasing the number of contacts with these heat-generating components per unit time, thereby strengthening the heat exchange process.

[0044] 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.

[0045] 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.

[0046] 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 can be guided to the driven wheel part very quickly.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The air duct of this engine: 1. Cold air is introduced through the air inlet 111, guided through the air guide chamber 220, and aimed at the driving wheel assembly 300, the driven wheel assembly 400 and the transmission part for heat exchange and cooling, which can effectively take away the heat generated during operation, prevent these key components from experiencing performance degradation, increased wear and even damage due to overheating, and ensure the normal and reliable operation of the entire engine. 2. The first spiral air guide portion 121 is set at the outer edge of the driving wheel assembly 300, which can specifically guide part of the gas entering the chamber 120, 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 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 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 stable operation of the driven wheel assembly 400. The third spiral air guide 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 provide assistance for the heat dissipation of the inner side of the driving wheel part, further improving the overall heat dissipation effect. 3. The second spiral air guide 240 is set using the groove wall structure of the groove 230 of the crankcase cover 200, without the need to add a large number of complex components or occupy too much space, and optimizes the layout of the air duct in the engine chamber 120, making the air duct system more compact, efficient and reasonable. 4. When the driving wheel assembly 300 and the driven wheel assembly 400 rotate, each spiral air guide portion guides the air flow to 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.

[0051] 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 air duct, characterized in that: include: An air inlet pipe is arranged on the crankcase of the engine, and one end of the air inlet pipe is provided with an air inlet port communicating with the outside of the crankcase; 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 air duct 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 is 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 is facing 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.

3. The engine air duct according to claim 2, characterized in that: It also includes a third spiral air guide portion arranged on the chamber and 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, and the third spiral air guide portion is used to guide the gas from the second spiral air guide portion to the upper air outlet.

4. The engine air duct according to claim 3, characterized in that: The crankcase is provided with an appendage for dividing the internal space of the crankcase into two parts, and the chamber is formed between the appendage and the crankcase cover, and 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.

5. The engine air duct according to claim 4, 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.

6. The engine air duct according to claim 1, characterized in that: The upper air outlet is provided with an air guide cover connected thereto, the air guide cover has a lateral opening, and the air guide cover is used to redirect the gas from the upper air outlet so that the gas flows out laterally from the lateral opening of the air guide cover.

7. The engine air duct according to claim 2, 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.

8. The engine air duct according to claim 7, 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.

9. The engine air duct according to claim 7, 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.

10. The engine air duct according to any one of claims 1 to 9, 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.

Images