Shell of transmission

Abstract

The shell of the transmission comprises a box cover used for defining a transmission cavity, and an air inlet used for guiding cooling airflow into the transmission cavity is formed in the box cover; the side, away from the transmission cavity, of the box cover is connected with a cooling air inlet cover surrounding the air inlet, a cooling air inlet is formed in the cooling air inlet cover, and the cooling air inlet is located in the axis direction of the air inlet. According to the scheme, the problem that a shell of a transmission in the prior art is difficult to consider a good cooling effect and unlimited appearance modeling design at the same time is solved.

Description

Technical Field

[0001] This invention relates to a transmission device for motorcycles, specifically a housing for a transmission. Background Technology

[0002] Motorcycle CVT (Continuously Variable Transmission) uses a belt and a combination of drive and driven pulleys to transmit power, enabling continuous changes in the gear ratio. CVTs generate considerable heat during operation, and effective heat dissipation is crucial for ensuring transmission efficiency and extending the transmission's lifespan. Cooling of motorcycle CVT components typically involves an air intake on the crankcase side cover, with fan blades integrated into the outer wall of the drive pulley. The drive pulley is connected to the engine's output shaft, which drives it, forcing in outside air for cooling via the fan blades. In existing technology, a cooling air intake shroud is usually installed outside the crankcase side cover before the outside air enters the transmission chamber to filter impurities and prevent water ingress. The cooling air intake shroud's inlet is often located around one side of the crankcase side cover (e.g., front, top, rear). These arrangements suffer from various problems, including longer intake paths, obstructed airflow, insufficient cooling, high noise levels, and aesthetic impact.

[0003] Chinese patent document CN104648120B discloses a scooter, specifically a transmission case containing a belt-driven gearbox. The transmission case has a cooling air inlet and an outlet, and a cover with the cooling air inlet located on it. Essentially, the disclosed design places the cooling air inlet on the front of the transmission cover. While this prior art allows for a shorter path for the cooling air inlet into the gearbox mechanism, its placement affects the overall shape and design of the transmission cover, significantly limiting the design of the gearbox housing.

[0004] Chinese patent document CN1738160B discloses a motor cooling structure for an electric vehicle, including a drive motor connected to a drive wheel; a power component housing for housing the drive motor and its transmission mechanism; an air inlet for introducing external gas into the air inlet as cooling gas; and an exhaust port located near the drive motor. The air inlet and exhaust port are connected through a gap between the stator and rotor of the drive motor. In a side view of the vehicle, the exhaust port is positioned within the projected area of ​​the drive motor, including a cover member that covers the exhaust port with a predetermined gap. The power component housing houses a continuously variable transmission (CVT) consisting of a drive pulley and a driven pulley connected by an annular belt, an intake fan coaxially mounted with the drive pulley, and a drive shaft coaxially connected to the drive motor and the driven pulley. The air inlet is located near the intake fan, and the exhaust port is an opening located on the side of the transmission mechanism. A central exhaust port, different from the exhaust port, is located in the center of the power component housing. Essentially, the disclosed structure has the cooling air inlet located on the rear side of the transmission housing cover. Although the location of the cooling air inlet does not affect the appearance design of the transmission housing, the large distance between the cooling air inlet and the interior of the transmission chamber can easily lead to insufficient cooling of the transmission. Summary of the Invention

[0005] The purpose of this invention is to provide a housing for a transmission to solve the problem in the prior art that it is difficult to simultaneously achieve good cooling effect and unrestricted appearance design in the housing of a transmission.

[0006] To achieve the above objectives, the basic solution of the present invention provides a housing for a transmission, including a cover for forming a transmission chamber, the cover having an air inlet for introducing cooling airflow into the transmission chamber; a cooling air intake shroud surrounding the air inlet is connected to the side of the cover away from the transmission chamber, the cooling air intake shroud having a cooling air inlet located in the axial direction of the air inlet.

[0007] Preferably, an air intake shroud is provided on the side of the cooling air inlet facing the air inlet, the middle of the air intake shroud is a shielding part directly opposite the air inlet, the axial projection of the air inlet is located inside the shielding part, and the air intake shroud is provided with airflow holes along the edge of the shielding part.

[0008] Preferably, the air passages are arranged in a grid pattern.

[0009] Preferably, the bottom of the inner shell of the air intake shroud is provided with an overflow port, and the bottom of the cooling air intake shroud is provided with a drain port.

[0010] Preferably, a foam filter element is also provided between the inner shell of the air intake shroud and the cooling air intake shroud.

[0011] Preferably, the inner shell of the air intake shroud is detachably connected to the cooling air intake shroud.

[0012] Preferably, the cooling air inlet is recessed along the axial direction of the air inlet.

[0013] The present invention has the following beneficial effects: 1. In this design, outside air enters through a cooling air inlet located axially above the air intake, shortening the airflow path and allowing it to quickly enter the transmission chamber for cooling. This improves the cooling effect of the transmission chamber. Furthermore, the cooling air inlet is not located at the edge of the cooling intake shroud, thus avoiding any impact on the appearance design of the transmission housing. Compared to existing technologies, the transmission housing of this invention offers the advantages of both excellent cooling performance and freedom from design limitations.

[0014] 2. By adopting this solution, the noise inside the transmission chamber is blocked by the inner shell of the air intake after being transmitted through the air intake, thereby reducing the noise transmitted through the cooling air inlet, which helps to reduce the noise at the transmission housing.

[0015] 3. This solution uses a foam filter element to filter incoming outside air, ensuring the cleanliness of the air entering the transmission chamber. Simultaneously, the foam filter element can further absorb noise transmitted from the transmission chamber, thereby further reducing noise at the transmission housing. Furthermore, during rain or car washes, the foam filter element helps prevent water from entering the air intake, and the water is discharged through the overflow port under the action of the air intake cover, thus preventing water from entering the transmission chamber and extending the transmission's service life.

[0016] 4. This invention integrates the dustproof, waterproof, and fan noise isolation functions of the transmission housing into a single, independent component, which features low cost, easy maintenance, and good cooling performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of a transmission housing according to the present invention; Figure 2 for Figure 1 Exploded view; Figure 3 for Figure 2 Assembly diagram of the intercooling air intake shroud and the inner shell of the air intake shroud; Figure 4 for Figure 3 Exploded view. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Cooling air inlet shroud, 1a. Cooling air inlet, 1b. Drain outlet, 2. Inner shell of air inlet shroud, 2a. Airflow hole, 2b. Overflow outlet, 3. Foam filter element, 4. Screw, 5. Bolt, 6. Cooling fan, 7. Driven pulley, 8. Transmission belt, 9. Cover, 9a. Air inlet, 10. Left box body.

[0019] The basic implementation examples are as follows: Figures 1 to 4 The image shows a transmission housing, including a cover 9 for enclosing a transmission chamber. The cover 9 has an air inlet 9a for introducing cooling airflow into the transmission chamber. A cooling air intake shroud 1, surrounding the air inlet 9a, is connected to the side of the cover 9 away from the transmission chamber. The cooling air intake shroud 1 has a cooling air inlet 1a located along the axial direction of the air inlet 9a. In this embodiment, the cooling air intake shroud 1 is connected to the cover 9 by bolts 5; the cooling air inlet 1a is recessed along the axial direction of the air inlet 9a. An air intake cover 2 is provided on the side of the cooling air inlet 1a facing the air intake 9a. The middle part of the air intake cover 2 is a shielding part directly opposite the air intake 9a. The axial projection of the air intake 9a is located inside the shielding part, so that the shielding part can block the noise in the transmission chamber from being directly transmitted to the cooling air inlet 1a through the air intake 9a and then spread to the outside, thereby helping to reduce the noise at the cooling air inlet 1a. At the same time, the shielding part can also be used to block external impurities or water from being directly transmitted into the transmission chamber through the air intake 9a.

[0020] Airflow holes 2a are provided along the edge of the obstruction portion of the inner shell 2 of the air intake shroud. In this embodiment, the inner shell 2 of the air intake shroud is approximately trapezoidal in shape, and the airflow holes 2a are distributed at the two sides and the long bottom edge of the inner shell 2 of the air intake shroud. The airflow holes 2a are arranged in a grid pattern. An overflow port 2b is provided at the bottom of the inner shell 2 of the air intake shroud, so that water entering from the cooling air inlet 1a is blocked by the inner shell 2 of the air intake shroud and discharged from the overflow port 2b. A drain port 1b is provided at the bottom of the cooling air intake shroud 1, so that the water discharged from the inner shell 2 of the air intake shroud is further discharged to the outside of the transmission housing. The inner shell 2 of the air intake shroud and the cooling air intake shroud 1 are detachably connected. In this embodiment, the detachable connection between the inner shell 2 of the air intake shroud and the cooling air intake shroud 1 is preferably made of screws 4. A foam filter element 3 is also provided between the inner shell 2 of the air intake shroud and the cooling air intake shroud 1. In this embodiment, a receiving cavity for accommodating the foam filter element 3 is provided between the inner shell 2 of the air intake hood and the cooling air intake hood 1. The foam filter element 3 is clamped and fixed by the inner shell 2 of the air intake hood and the cooling air intake hood 1. The shape of the foam filter element 3 is a trapezoid that matches the inner shell 2 of the air intake hood, so that the foam filter element 3 will not rotate or move within the receiving cavity, thus ensuring the blocking effect of the foam filter element 3 on impurities and water.

[0021] The specific implementation process is as follows: In actual use, the transmission is generally connected to the engine crankcase as a whole. Therefore, part of the transmission housing is integrally formed with the left crankcase 10, and the transmission housing cover 9 is integrally formed with the left crankcase cover. The intake shroud inner shell 2 is connected and fixed to the cooling intake shroud 1 by screws 4, and the cooling intake shroud 1 is connected and fixed to the cover 9 by bolts 5. The transmission chamber is equipped with a drive pulley, a driven pulley 7, and a transmission belt 8. The drive pulley integrates a cooling fan 6. When in use, the transmission operates, and the drive pulley drives the cooling fan 6 to rotate, thereby creating a negative pressure at the air intake 9a of the cover 9, which is directly opposite the cooling fan 6. This allows outside air to enter the cooling air inlet 1a, pass through the foam filter element 3, and then enter the air intake 9a through the air flow hole 2a. Both the cooling air inlet 1a and the inner shell 2 of the air intake cover are located axially above the air intake 9a, which shortens the distance of outside air from the cooling air inlet 1a to the air intake 9a and reduces intake resistance, thus improving the cooling effect of the transmission compared with the prior art. Furthermore, this invention avoids the problems of high noise levels at the transmission housing and limitations on its appearance.

[0022] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A housing for a transmission, comprising a cover for enclosing a transmission chamber, the cover having an air inlet for introducing cooling airflow into the transmission chamber; a cooling air intake shroud surrounding the air inlet is connected to the side of the cover away from the transmission chamber, the cooling air intake shroud having a cooling air inlet, characterized in that: The cooling air inlet is located on the axial direction of the air inlet.

2. The housing of a transmission according to claim 1, characterized in that: The cooling air inlet is provided with an air intake shroud inner shell on the side facing the air inlet. The middle part of the air intake shroud inner shell is a shielding part directly opposite the air inlet. The axial projection of the air inlet is located inside the shielding part. The air intake shroud inner shell is provided with airflow holes along the edge of the shielding part.

3. The housing of a transmission according to claim 2, characterized in that: The air passages are arranged in a grid pattern.

4. The housing of a transmission according to claim 3, characterized in that: An overflow port is provided at the bottom of the inner shell of the air intake shroud, and a drain port is provided at the bottom of the cooling air intake shroud.

5. The housing of a transmission according to claim 4, characterized in that: A foam filter element is also provided between the inner shell of the air intake hood and the cooling air intake hood.

6. The housing of a transmission according to claim 5, characterized in that: The inner shell of the air intake shroud is detachably connected to the cooling air intake shroud.

7. The housing of a transmission according to claim 6, characterized in that: The cooling air inlet is recessed along the axial direction of the air inlet.

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