CVT cooling air duct of horizontal double-cylinder engine

Abstract

The utility model discloses a CVT cooling air duct of a horizontal double-cylinder engine, which comprises a CVT box body, an air inlet duct and an air outlet duct, the air inlet duct and the air outlet duct are arranged on the CVT box body, and the CVT box body comprises an inner side cover and an outer side cover; a driving wheel, a driven wheel and a belt are assembled in the CVT box body; the air inlet duct and the air outlet duct are arranged on the upper side of the inner side cover, the air inlet duct is arranged close to one side of the driving wheel, and the air outlet duct is arranged close to one side of the driven wheel; the outer side cover is provided with an air inlet cavity communicated with the air inlet channel, and the side, facing the inner side cover, of the air inlet cavity is provided with an air suction opening corresponding to the driving wheel blades. The air inlet duct and the air outlet duct are both arranged on the inner side cover and are arranged on the same side face of the inner side cover, so that the structure is simpler, and the mold opening cost is lower.

Description

Technical Field

[0001] The utility model relates to the field of engine transmissions, and particularly relates to a CVT cooling air duct for a horizontal twin-cylinder engine. Background Art

[0002] CVT (Continuously Variable Transmission) is a commonly used transmission in motor vehicles at present; compared with stepped transmissions, the transmission ratio of CVT is not a discontinuous point, but a series of continuous values. Such a transmission characteristic enables motor vehicles equipped with continuously variable transmissions to have good economy, power performance, and driving smoothness.

[0003] The drive belt of the transmission system inside the CVT plays an important role in realizing the transmission and speed change of the CVT. Since the drive belt of the transmission system rubs repeatedly during operation and is prone to heat generation, flowing air is required inside the continuously variable transmission to cool the drive belt of the transmission system. To dissipate heat from the internal transmission system of the CVT, an air intake passage and an air outlet passage are usually provided on the CVT housing. After the outside air enters the CVT through the air intake passage, the fan blades on the CVT driving pulley suck the outside cold air into the housing. After passing through the transmission system, the hot air is discharged through the air outlet passage, taking away the heat in the CVT housing, thereby achieving the effect of cooling the drive belt of the transmission system. The existing air intake and exhaust ducts of the CVT housing are respectively arranged on the opposite sides or adjacent sides of the housing, resulting in high mold opening costs. After the exhaust duct is arranged downward, it is also easy to splash the water or stones on the road surface into the exhaust duct and then into the CVT housing, and the intake and exhaust efficiency is not high, which is not convenient for large-scale popularization. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide a CVT cooling air duct for a horizontal twin-cylinder engine, which solves the problems of low intake and exhaust efficiency and high mold opening cost in the existing CVT housing.

[0006] A CVT cooling air duct for a horizontal twin-cylinder engine, comprising a CVT box body, an air inlet duct and an air outlet duct arranged on the CVT box body. The CVT box body includes an inner cover and an outer cover; a driving pulley, a driven pulley and a belt are assembled in the CVT box body; both the air inlet duct and the air outlet duct are arranged on the upper side of the inner cover. The air inlet of the air inlet duct and the air outlet of the air outlet duct are both arranged forward, and the air inlet duct is arranged close to the driving pulley side, and the air outlet duct is arranged close to the driven pulley side. The air outlet duct is tangent to the side wall of the inner cover; an air inlet chamber communicating with the air inlet duct is provided on the outer cover, and an air extraction port corresponding to the blades of the driving pulley is provided on the side of the air inlet chamber facing the inner cover. In this way, both the air inlet duct and the air outlet duct are arranged on the upper side of the CVT box body, so that the shape is more regular and the mold opening is correspondingly simpler, which can effectively reduce the mold opening cost. After the exhaust duct is arranged upward, stones can be prevented from being thrown into the CVT box body. After the motorcycle engine is started, the CVT driving pulley rotates, so that the blades on the driving pulley also rotate, forming a negative pressure with the outside of the box body. The cold air outside the box body is sucked from the air inlet duct into the air inlet chamber, and then reaches the driving pulley through the air extraction port to cool the driving pulley. At the same time, under the action of the blades of the driving pulley, the air flows to the driven pulley, and after passing through the driven pulley, it is guided to the air outlet duct in the clockwise direction along its side wall, and the hot air is discharged from the air outlet duct. Since the air outlet is arranged forward, when the hot air is discharged from the exhaust duct, the external cold air will directly blow the hot air in the opposite direction of riding and will not flow to the front end, and the hot air flow can be taken away immediately. The provided air inlet chamber can form a vortex of cold air in the air inlet chamber after sucking the external cold air, increasing the air flow rate.

[0007] Further, a blocking rib is provided on the side of the inner cover facing the outer cover. The upper end of the blocking rib is connected to the upper wall of the inner cover, and the lower end extends towards the driven pulley shaft direction. In this way, the provided blocking rib can form a certain block to the air on the driven pulley side, preventing part of the hot air from entering the driving pulley through the space above the driven pulley when the hot air is discharged from the air outlet duct, affecting the hot air discharge efficiency.

[0008] Further, the blocking rib is obliquely arranged, and the inclination direction is the same as that of the air outlet duct; a wheel shaft assembly ring protruding towards the outer cover direction is provided on the inner cover, and the lower end of the blocking rib is connected to the wheel shaft assembly ring. In this way, the blocking rib is obliquely arranged, which can well guide the hot air to the air outlet duct and shorten the path of the hot air discharge.

[0009] Further, the air inlet duct is composed of a guiding channel and a leading-in channel. The guiding channel is located at the lower end of the leading-in channel and is arranged towards the air inlet chamber, and is communicated with the air inlet of the upper end of the air inlet chamber. In this way, the guiding channel in the provided air inlet duct is arranged facing the air inlet chamber and is communicated with the air inlet chamber, which can guide the cold air when the blades of the driving pulley suck the cold air.

[0010] Further, two cylindric bodies that are inclined forward are arranged at intervals on the inner cover. The cylindric bodies are integrally formed with the inner cover, and the channels in the middle of the two cylindric bodies form the air inlet duct and the air outlet duct. In this way, both the air outlet duct and the air inlet duct are integrally formed with the inner cover, and can be formed by one-time die casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. 6 is a schematic perspective view of the CVT housing in the embodiment;

[0012] Figure 2 FIG. 10 is a schematic perspective view of the inner cover in the embodiment;

[0013] Figure 3 FIG. 14 is a schematic assembly structure view of the driving pulley, the driven pulley and the outer cover in the embodiment;

[0014] Figure 4 FIG. 18 is a schematic perspective view of the outer cover in the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0016] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] Such as Figures 1-4As shown in the figure, the CVT cooling air duct of the horizontal double-cylinder engine provided in this embodiment includes a CVT box body 1, an air inlet duct 13 and an air outlet duct 16 arranged on the CVT box body 1. The CVT box body 1 includes an inner cover 11 and an outer cover 12 (the inner cover 11 is fixedly connected to the engine assembly box body, and the outer cover 12 is fixedly connected to the inner cover 11 through fasteners); a driving pulley 2, a driven pulley 3 and a belt 4 are assembled in the CVT box body 1; both the air inlet duct 13 and the air outlet duct 16 are arranged on the upper side of the inner cover 11. The air inlet of the air inlet duct 13 and the air outlet of the air outlet duct 16 are both arranged forward. The air inlet duct 13 is arranged close to the driving pulley 2, and the air outlet duct 16 is arranged close to the driven pulley 3. The air outlet duct 16 is tangent to the side wall of the inner cover 11; an air inlet chamber 14 communicating with the air inlet duct 13 is provided on the outer cover 12, and an air extraction port 15 corresponding to the blades of the driving pulley 2 is provided on the side of the air inlet chamber 14 facing the inner cover 11. In this way, both the air inlet duct 13 and the air outlet duct 16 are arranged on the upper side of the CVT box body 1, so the shape is more regular and the mold opening is correspondingly simpler, which can effectively reduce the mold opening cost. After the exhaust duct is arranged upward, stones can be prevented from being thrown into the CVT box body 1. After the motorcycle engine is started, the driving pulley 2 of the CVT rotates, so that the blades on the driving pulley 2 also rotate, forming a negative pressure with the outside of the box. The cold air outside the box is sucked from the air inlet duct 13 into the air inlet chamber 14, then reaches the driving pulley 2 through the air extraction port 15, cools the driving pulley 2, and under the action of centrifugal force, the air flows to the driven pulley 3, and after passing through the driven pulley 3, it is guided along its side wall to the air outlet duct 16, and the hot air is discharged from the air outlet duct 16. Since the air outlet is arranged forward, when the hot air is discharged from the exhaust duct, the external cold air will directly blow the hot air in the opposite direction of riding and will not flow to the front end, and the hot air flow can be taken away immediately. The provided air inlet chamber 14 can form a vortex of the cold air in the air inlet chamber 14 after sucking the external cold air, increasing the air flow rate.

[0018] Further, a blocking rib 17 is provided on the side of the inner cover 11 facing the outer cover 12. The upper end of the blocking rib 17 is connected to the upper wall of the inner cover 11, and the lower end extends in the direction of the axis of the driven pulley 3. In this way, the provided blocking rib 17 can form a certain block to the air on the side of the driven pulley 3, preventing part of the hot air from entering the driving pulley 2 through the space above the driven pulley 3 when the hot air is discharged from the air outlet duct 16, affecting the hot air discharge efficiency.

[0019] Further, the blocking rib 17 is obliquely arranged, and the inclination direction is the same as that of the air outlet duct 16; a wheel shaft assembly ring protruding towards the outer cover 12 is provided on the inner cover 11, and the lower end of the blocking rib 17 is connected to the wheel shaft assembly ring. In this way, the blocking rib 17 is obliquely arranged, which can well guide the hot air to the air outlet duct 16 and shorten the path of the hot air discharge.

[0020] Further, the air inlet duct 13 is composed of an introduction channel 131 and a guiding channel 132. The guiding channel 132 is located at the lower end of the introduction channel 131 and is arranged towards the air inlet chamber 14, and is communicated with the air inlet of the upper end of the air inlet chamber 14. In this way, the arranged guiding channel 132 is arranged facing the air inlet chamber 14 and is communicated with the air inlet chamber 14, and can guide the cold air when the blades of the driving wheel 2 suck the cold air.

[0021] Further, two cylindric bodies that are inclined forward at intervals are provided on the inner side cover 11. The cylindric bodies are integrally formed with the inner side cover 11, and the channels in the middle of the two cylindric bodies form the air inlet duct 13 and the air outlet duct 16. The air inlet chamber 14 is formed after being connected by a side enclosure provided on the inner wall of the outer side cover 12 and a sealing plate that is hermetically connected to the side enclosure. The sealing plate is L-shaped, the upper end side is connected to the lower end of the guiding channel 132, and an introduction part corresponding to it is provided on the outer side cover 12 corresponding to the guiding channel 132. The air extraction port 15 is provided on the sealing plate.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements to the technical solutions of the present invention, without departing from the purpose and scope of the present technical solution, should be covered within the scope of the claims of the present invention.

Claims

1. A CVT cooling air duct for a horizontal twin-cylinder engine, comprising a CVT housing and an air inlet duct and an air outlet duct disposed on the CVT housing. The CVT housing includes an inner cover and an outer cover; a driving pulley, a driven pulley and a belt are assembled in the CVT housing; and it is characterized in that, Both the air inlet duct and the air outlet duct are provided on the upper side of the inner cover. The air inlet duct is arranged closer to the driving wheel side, and the air outlet duct is arranged closer to the driven wheel side. An air inlet chamber communicating with the air inlet duct is provided on the outer cover. A suction port corresponding to the blades of the driving wheel is provided on the side of the air inlet chamber facing the inner cover.

2. The CVT cooling air duct of the horizontal twin-cylinder engine according to claim 1, wherein, A blocking rib is provided on the side of the inner cover facing the outer cover. The upper end of the blocking rib is connected to the upper wall of the inner cover, and the lower end extends towards the driven wheel shaft.

3. The CVT cooling air duct of the horizontal twin-cylinder engine according to claim 2, characterized in that, The blocking rib is obliquely arranged, and the inclination direction is the same as that of the air outlet duct. A wheel shaft assembly ring protruding towards the outer cover is provided on the inner cover. The lower end of the blocking rib is connected to the wheel shaft assembly ring.

4. The CVT cooling air duct of the horizontal double-cylinder engine according to claim 1 or 2 or 3, characterized in that, The air inlet duct is composed of an introduction channel and a guiding channel. The guiding channel is located at the lower end of the introduction channel and is arranged towards the air inlet chamber, and is communicated with the air inlet of the upper end of the air inlet chamber.

5. The CVT cooling air duct of the horizontal twin-cylinder engine according to claim 4, characterized in that Two cylindric bodies inclined forward are arranged at intervals on the inner cover. The cylindric bodies are integrally formed with the inner cover, and the channels in the middle of the two cylindric bodies form the air inlet duct and the air outlet duct.

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