Air outlet structure of transmission case

Abstract

The utility model provides a transmission case air outlet structure which is suitable for a stepless speed change system, the stepless speed change system is installed in a transmission case and is provided with a driving disc set and a driven disc set, the driving disc set and the driven disc set are correspondingly arranged in a driving disc cavity, a driven disc cavity and a transmission belt-shaped piece connected between the driving disc cavity and the driven disc cavity respectively, and an air outlet channel is arranged on the side of the driven disc cavity. A first air outlet is formed in the tail end of the air outlet channel, the transmission case air outlet structure comprises a gradually-expanding gap rib, and the gradually-expanding gap rib is formed by extending from the abutting face of the driven disc cavity from bottom to top and inclines towards the air outlet channel so that the air outlet channel can form a gradually-expanding gap. And the air guide rib is convexly arranged from the inner wall of the transmission case to the driven disc cavity and is used for guiding the cooling air to be discharged from the air outlet channel.

Description

Technical Field

[0001] This utility model is mainly a transmission box air outlet structure, especially a transmission box air outlet structure that can drive airflow to be discharged quickly. Background Technology

[0002] Both motorcycles and cars are road vehicles. Cars are large and heavy, making them almost impossible for one person to push alone, and their design and manufacturing costs are also higher. In contrast, motorcycles have advantages such as agility, ease of one-person propulsion, and lower cost. Therefore, motorcycles are common in densely populated areas with limited space.

[0003] The belt-driven continuously variable transmission (CVT) mechanism equipped on a typical motorcycle is one of the important factors contributing to its ease of operation. When the motorcycle is traveling at high speed, the mechanism inside the transmission box inevitably generates high temperatures. Therefore, a rapid ventilation system is necessary to reduce the temperature of the transmission mechanism. However, in reality, traditional ventilation structures often cause external air to flow back into the transmission box due to the backflow of air from the vents, drawing in dust and making the transmission box prone to dust accumulation. This makes it easy for dust to enter the CVT system, causing belt wear and damage to the CVT system. Utility Model Content

[0004] This invention provides a transmission box air outlet structure, which can drive airflow to be discharged quickly, thus providing better cooling effect for continuously variable transmission systems.

[0005] This utility model discloses a transmission box air outlet structure applicable to a continuously variable transmission (CVT) system. The CVT system is installed in a transmission box and has a drive disc assembly and a driven disc assembly, respectively disposed in a drive disc cavity and a driven disc cavity, and a transmission belt connecting the two. One side of the driven disc cavity has an air outlet channel, and the end of the air outlet channel has a first air outlet. The transmission box air outlet structure includes: a gradually expanding gap rib, which extends from a bottom to the top from an abutment surface of the driven disc cavity and is inclined toward the air outlet channel, making the air outlet channel a gradually expanding gap; and a guide rib, which protrudes from the inner wall of the transmission box toward the driven disc cavity to guide a cooling air out of the air outlet channel.

[0006] In one embodiment of the present invention, the transmission box further includes an air inlet for introducing the external cooling air, which flows sequentially through the drive disk assembly and the passive disk assembly, and is then discharged from the air outlet channel.

[0007] In one embodiment of the present invention, a second air outlet is further included between the driving disk cavity and the passive disk cavity.

[0008] In one embodiment of this utility model, the air outlet channel is formed between the aforementioned transmission box and the gradually widening gap rib.

[0009] In one embodiment of the present invention, the end of the aforementioned gradually widening gap rib and the end of the air guide rib form an air outlet at the front end of the air outlet channel.

[0010] In one embodiment of this utility model, the diameter of the air outlet inlet is slightly equal to or smaller than the diameter of the first air outlet.

[0011] In one embodiment of the present invention, the end of the aforementioned gradually widening gap rib has a first distance from the passive disk assembly, and the end of the air guide rib has a second distance from the passive disk assembly, wherein the first distance is greater than the second distance.

[0012] In one embodiment of the present invention, the second distance is provided between the end of the aforementioned air guide rib and the passive disk assembly to prevent the air guide rib from interfering with the rotation of the passive disk assembly.

[0013] In one embodiment of this utility model, the angle between the first air outlet side and the end of the gradually widening gap rib is greater than 0 degrees.

[0014] In one embodiment of this utility model, the aforementioned air guide rib system is integrally formed with the transmission box.

[0015] This utility model utilizes a transmission box air outlet structure that is easy to assemble and disassemble. By employing the structural features of the gradually expanding gap rib and the air guide rib, a gradually expanding gap rib extending from bottom to top is set between the air outlet channel of the continuously variable transmission (CVT) driven disc assembly. This allows the rotating airflow of the driven disc assembly to be quickly discharged along the gradually expanding gap rib and guided by the air guide rib. Furthermore, because the gradually expanding gap rib is set at a high position, it can effectively block sand, gravel, or mud sprayed upwards by the rear wheel of the motorcycle during operation, preventing dust from entering the CVT system and causing belt wear or damage to the CVT system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a transmission box air outlet structure according to the present utility model;

[0017] Figure 2 This is a schematic diagram of the cooling airflow of a transmission box according to the present invention;

[0018] Figure 3 This is a schematic diagram of a transmission box air outlet structure according to the present invention used in a vehicle.

[0019] List of reference numerals

[0020] 1. Transmission box

[0021] 11 Drive disk group

[0022] 12 Passive disk group

[0023] 13. Transmission belt components

[0024] 14 Air outlet duct

[0025] 15 First air outlet

[0026] 2. Transmission box air outlet structure

[0027] 21. Gradually widening gap rib

[0028] 22 air guide ribs

[0029] 3. Straddle motorcycle

[0030] 31 Frame Units

[0031] 32 front wheels

[0032] 33 Steering Mechanism

[0033] 34 seat cushions

[0034] 35 Storage Box

[0035] 36 Fuel Tank

[0036] 37 Rear Wheel

[0037] D First Distance

[0038] d Second distance

[0039] Reference point A

[0040] Reference point B

[0041] Angle C. Detailed Implementation

[0042] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0043] Please see Figure 1 , Figure 1This is a schematic diagram of a transmission box air outlet structure according to the present invention; a transmission box air outlet structure 2 is suitable for a continuously variable transmission system, the continuously variable transmission system is installed in a transmission box 1, has a drive disc assembly 11 and a driven disc assembly 12, respectively disposed in a drive disc cavity and a driven disc cavity, and a transmission belt 13 connecting the two, the driven disc cavity has an air outlet channel 14 on one side, the air outlet channel 14 has a first air outlet 15 at the end, the transmission box air outlet structure 2 includes: a gradually expanding gap rib 21, the gradually expanding gap rib 21 extends from a bottom to the top from an abutment surface of the driven disc cavity, and is inclined toward the air outlet channel 14, so that the air outlet channel 14 has a gradually expanding gap; and a guide rib 22, protruding from the inner wall of the transmission box 1 toward the driven disc cavity, for guiding a cooling air out of the air outlet channel 14.

[0044] A transmission belt 13 is sleeved between the drive disc assembly 11 and the driven disc assembly 12. The transmission belt 13 can be a belt or a chain. The driven disc assembly 12 is connected to a transmission gear set. The drive disc assembly 11 can transmit power to the driven disc assembly 12 at the other end of the transmission box 1 via the transmission belt 13, and finally transmit it to the rear wheel axle to drive the rear wheel via the transmission gear set.

[0045] In this embodiment, the transmission box 1 further includes an air inlet for introducing the external cooling air, which flows sequentially through the drive disk assembly 11 and the passive disk assembly 12, and is then discharged from the air outlet 14.

[0046] In this embodiment, a second air outlet is also included between the drive plate cavity and the passive plate cavity.

[0047] In this embodiment, the air outlet channel 14 is formed between the transmission box 1 and the gradually widening gap rib 21.

[0048] In this embodiment, the end of the gradually widening gap rib 21 and the end of the air guide rib 22 form an air outlet at the front end of the air outlet channel 14.

[0049] In this embodiment, the diameter of the air outlet inlet is slightly equal to or smaller than the diameter of the first air outlet 15.

[0050] In this embodiment, the end of the gradually widening gap rib 21 has a first distance from the passive disk assembly 12, and the end of the air guide rib 22 has a second distance from the passive disk assembly 12, wherein the first distance is greater than the second distance.

[0051] In this embodiment, the second distance is provided between the end of the air guide rib 22 and the passive disk assembly 12 to prevent the air guide rib 22 from interfering with the rotation of the passive disk assembly 12.

[0052] In this embodiment, the angle between the side of the first air outlet 15 and the end of the gradually widening gap rib 21 is greater than 0 degrees.

[0053] Preferably, the angle can be 15 degrees, 30 degrees, 45 degrees, 60 degrees, or 75 degrees.

[0054] In this embodiment, the air guide rib 22 is integrally formed with the transmission box 1.

[0055] Please see Figure 2 , Figure 2 This is a schematic diagram of the cooling airflow of a transmission box according to the present invention. The transmission box 1 also includes an air inlet for introducing the external cooling air, and the transmission box 1 is designed with a first air outlet 15 and a second air outlet at two different locations. In this invention, the external cooling air flows sequentially through the drive disk assembly 11 and the driven disk assembly 12 and then discharges the heated air from the first air outlet 15 of the air outlet channel 14, as shown by the arrow.

[0056] In this embodiment, the end of the gradually widening gap rib 21 has a first distance D between it and the passive disk assembly 12, and the end of the air guide rib 22 has a second distance d between it and the passive disk assembly 12. The first distance D is greater than the second distance d, so as to guide the external cooling air to be quickly discharged through the air outlet duct 14.

[0057] The second distance d is provided between the end of the air guide rib 22 and the passive disk assembly 12 to prevent the air guide rib 22 from interfering with the rotation of the passive disk assembly 12.

[0058] In this embodiment, the reference point A on one side of the first air outlet 15 has an angle C with the reference point B at the end of the gradually widening gap rib 21. The angle C is greater than 0 degrees to prevent external mud and water from splashing into the passive disc cavity.

[0059] Preferably, the angle C can be 15 degrees, 30 degrees, 45 degrees, 60 degrees, or 75 degrees.

[0060] Please see Figure 3 , Figure 3 This is a schematic diagram of a transmission box air outlet structure according to the present invention used in a vehicle.

[0061] The present invention is implemented in a vehicle, taking a straddle-type vehicle (motorcycle) 3 as an example. The straddle-type vehicle 3 has a frame unit 31, on which an engine unit capable of generating power is connected. A front wheel 32 is supported at the front end of the frame unit 31. Above the front wheel 32 and supported on the frame unit 31, a steering mechanism 33 for steering the straddle-type vehicle 3 is provided. Above the rear end of the frame unit 31, a seat 34 for the driver is provided. Below the seat 34, a [missing information - likely a device or feature] is provided. The vehicle frame unit 31 has a storage box 35 for storing items. A fuel tank 36, which can also be a battery, is provided between the front wheel 32 and the seat 34. The engine unit has a crankcase that can house the crankshaft. The crankshaft is connected to a piston. The drive disc assembly 11 of the transmission box 1 is provided on the crankshaft of the engine unit 3. A rear rocker arm is pivotally mounted at the rear end of the crankcase. A rear wheel 37 is pivotally mounted at the rear end of the rear rocker arm. The rear rocker arm can swing freely up and down around the axis of the driven disc assembly 12 of the transmission box 1.

[0062] A transmission belt 13 is sleeved between the drive disc assembly 11 and the driven disc assembly 12. The transmission belt 13 can be a belt or a chain. The driven disc assembly 12 is connected to a transmission gear set. The drive disc assembly 11 can transmit power to the driven disc assembly 12 at the other end of the transmission box 1 via the transmission belt 13, and finally transmit it to the rear wheel axle to drive the rear wheel via the transmission gear set.

[0063] The air inlet of the transmission box 1 is used to introduce the external cooling air, and the transmission box 1 is designed with a first air outlet 15 and a second air outlet at two different positions. In this utility model, the external cooling air flows through the drive disk assembly 11 and the passive disk assembly 12 in sequence and then discharges the air with increased temperature, which is discharged from the first air outlet 15 of the air outlet channel 14.

[0064] In summary, the transmission box air outlet structure of this utility model utilizes the structural features of the gradually expanding gap rib and the air guide rib. A single gradually expanding gap rib extending from bottom to top is set between the air outlet channel of the continuously variable transmission (CVT) driven disc assembly. This allows the rotating airflow of the driven disc assembly to be quickly discharged along the gradually expanding gap rib and guided by the air guide rib. Furthermore, because the gradually expanding gap rib is positioned relatively high, it can effectively block sand or mud sprayed upwards by the rear wheel during motorcycle operation, preventing dust from entering the CVT system and causing belt wear or damage to the CVT system.

[0065] Although the present invention has been disclosed with reference to the foregoing embodiments, it is not intended to limit the present invention. Any modifications and equivalent substitutions made by any person skilled in the art without departing from the spirit and scope of the present invention shall still be within the scope of patent protection of the present invention.

Claims

1. A transmission box air outlet structure, characterized in that, This invention relates to a continuously variable transmission (CVT) system, wherein the CVT is installed within a transmission housing and comprises a drive disc assembly and a driven disc assembly, respectively disposed in a drive disc cavity and a driven disc cavity. The driven disc cavity has an air outlet channel on one side, and a first air outlet at the end of the air outlet channel. The transmission housing air outlet structure includes: A gradually widening gap rib extends upward from a contact surface of the passive disc cavity and is inclined toward the air outlet channel, thus creating a gradually widening gap in the air outlet channel; and A guide rib protrudes from the inner wall of the transmission box toward the passive disc cavity to guide a cooling air out of the air outlet channel.

2. The transmission box air outlet structure according to claim 1, characterized in that, The transmission box also includes an air inlet for introducing the cooling air from the outside, which flows sequentially through the drive disk assembly and the driven disk assembly, and is then discharged from the air outlet channel.

3. The air outlet structure of the transmission box according to claim 1, characterized in that, The driving disc cavity and the passive disc cavity also include a second air outlet.

4. The air outlet structure of the transmission box according to claim 1, characterized in that, The air outlet channel is formed between the transmission box and the gradually widening gap rib.

5. The air outlet structure of the transmission box according to claim 1, characterized in that, The ends of the gradually widening gap ribs and the ends of the air guide ribs form an air outlet at the front end of the air outlet channel.

6. The transmission box air outlet structure according to claim 5, characterized in that, The diameter of the air outlet inlet is slightly equal to or smaller than the diameter of the first air outlet.

7. The air outlet structure of the transmission box according to claim 5, characterized in that, The end of the gradually widening gap rib has a first distance from the passive disk assembly, and the end of the air guide rib has a second distance from the passive disk assembly, wherein the first distance is greater than the second distance.

8. The transmission box air outlet structure according to claim 7, characterized in that, The second distance is used to prevent the air guide ribs from interfering with the rotation of the passive disk assembly.

9. The air outlet structure of the transmission box according to claim 1, characterized in that, The angle between the first air outlet side and the end of the gradually widening gap rib is greater than 0 degrees.

10. The air outlet structure of the transmission box according to claim 1, characterized in that, The air guide rib is integrally formed with the transmission box.

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