TWI902542B - Filter mechanism of continuously variable speed system - Google Patents

Abstract

A filter mechanism of a continuously variable speed system. The continuously variable speed system is installed in a transmission box. The transmission box has a transmission box cover, a cooling air inlet, and a cooling air guide cover arranged outside the transmission box cover. The outer side of the transmission case cover has an air guide hole for external cooling air to enter. The filter mechanism includes: a first filter element, which is located on the cooling air guide cover; a second filter element, which is located on the cooling air guide cover; Located on the transmission case cover; and a cooling air flow path, which extends continuously from the air hole through the first filter element and the second filter element to the transmission case cover.

Description

Filtering mechanism of continuously variable transmission (CVT) system

This invention is primarily a filtration mechanism for a continuously variable transmission (CVT) system, particularly designed to prevent dust or foreign matter in the air from entering the transmission housing, thereby ensuring the cleanliness of the cooling air and improving the performance of the CVT system.

Both motorcycles and cars are road vehicles. In addition to being large and heavy, making them almost impossible for one person to push alone, cars are also more difficult to design and more expensive to manufacture. In contrast, motorcycles have advantages such as agility, ease of pushing by one person, and lower cost. Therefore, motorcycles are common in densely populated areas with limited space.

The belt-driven continuously variable transmission (CVT) mechanism equipped on most motorcycles is one of the key factors contributing to their ease of operation. When a motorcycle is traveling at high speeds, the transmission mechanism inevitably generates high temperatures. Therefore, a cooling design is necessary to reduce the temperature of the transmission mechanism. Furthermore, the cooling air introduced into the transmission case must first filter out larger dust particles to prevent damage to the transmission mechanism. Therefore, the transmission case must be equipped with a filtration device. The air intake vents face forward of the vehicle. While the positive pressure created by the vehicle's movement helps draw cooling air into the continuously variable transmission (CVT) chamber, it also easily draws external dust into the CVT chamber, causing dust to accumulate on the filter and shortening its lifespan. This makes it easy for dust to enter the CVT chamber, resulting in belt wear and damage to the CVT system.

This invention provides a filtration mechanism for a continuously variable transmission (CVT) system. Through a two-stage dust filtration structure, it improves the filtration effect of clean cooling air, thereby providing better cooling for the CVT system.

The present invention discloses a filtration mechanism for a continuously variable transmission (CVT) system, the CVT being installed in a transmission case of a vehicle body. The transmission case has a transmission case cover with a cooling air inlet and a cooling air guide cover disposed on the outside of the transmission case cover, and has an air guide hole for allowing external cooling air to enter. The filtration mechanism includes: a first filter element located on the cooling air guide cover; a second filter element located outside the cooling air inlet in the transmission case cover; and a cooling air flow path extending continuously from the air guide hole through the first filter element and the second filter element to the transmission case cover.

In one embodiment of the present invention, the continuously variable transmission system includes: a drive disc assembly; a passive disc assembly; and a transmission belt connecting the two, wherein the cooling air guide cover is located on the side of the drive disc assembly, and the air vent faces the front or side of the vehicle body to facilitate the acquisition of external cooling air.

In one embodiment of the present invention, the first filter element has a first filter screen, and the second filter element has a second filter screen, wherein the density of the first filter screen is lower than the density of the second filter screen.

In one embodiment of the present invention, the first filter element described above has a first filter screen and a third filter screen, the third filter screen having greater rigidity than the first filter screen.

In one embodiment of the present invention, the first filter element has an outer ring and a plurality of ribs for fixing the first filter screen.

In one embodiment of the invention, the third filter and the first filter can be easily removed simultaneously from the first filter element.

In one embodiment of the present invention, the inner side of the cooling air guide cover is surrounded by a sponge strip.

In one embodiment of the present invention, the first filter element includes a positioning hole for fixing the first filter element at the position of the air guide hole.

In one embodiment of the present invention, the cooling air guide cover has a plurality of guide ribs to form the cooling air flow path.

In one embodiment of the present invention, the aforementioned cooling airflow is configured to guide the external cooling airflow radially inward through the first filter and the external cooling airflow radially inward through the second filter.

This invention utilizes a continuously variable transmission (CVT) system with a multi-layer filtration structure to add two layers of dust-proof filtration inside the cooling air guide cover, thereby improving the problem of dust accumulation in traditional filters. After cooling air is introduced through the air duct, larger dust and impurities are filtered out by the first filter element. The pre-filtered cooling air is then guided along the cooling airflow path to the second filter element for a second filtration. This effectively reduces dust and impurities in the cooling air, preventing dust from entering the continuously variable transmission (CVT) system and causing belt wear or damage to the CVT system. This achieves a better cooling effect. Furthermore, the density of the first filter element is lower than that of the second filter element, which facilitates air intake.

To make the above features and advantages of this invention more apparent and understandable, specific examples are given below, along with accompanying drawings, for detailed explanation.

Figure 1 is a cross-sectional view of a filter mechanism for a continuously variable transmission (CVT) system according to the present invention. In Figure 1, a CVT system 1 is installed in a transmission case 2 of a vehicle body. The transmission case 2 has a transmission case cover 21 with a cooling air inlet 22 and a cooling air guide cover 3 disposed on the outside of the transmission case cover 21, and has an air guide hole 31 for allowing external cooling air to enter. The filter... The mechanism includes: a first filter element 4 located outside the cooling air inlet 22 in the cooling air guide cover 3; a second filter element 5 located on the transmission box cover 21; and a cooling air flow path 6 extending continuously from the air guide hole 31 through the first filter element 4 and the second filter element 5 to the transmission box cover 21.

In this embodiment, the continuously variable transmission system 1 includes: a drive disc assembly 11; a passive disc assembly 12; and a transmission belt 13 connecting the two, and the cooling air guide cover 3 is located on the side of the drive disc assembly 11, and the air guide hole 31 faces the front or side of the vehicle body to facilitate the acquisition of external cooling air.

A transmission belt 13 is fitted 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 at the other end of the transmission box 2 via the transmission belt 13, and finally transmit it to the rear wheel axle to drive the rear wheel via the transmission gear set.

In this invention, a continuously variable transmission (CVT) system 1 is installed inside a transmission housing 2. The CVT system 1 includes a drive disc assembly 11, a driven disc assembly 12, and a transmission belt 13 connecting the drive disc assembly 11 and the driven disc assembly 12. The transmission housing 2 has a transmission housing cover 21, on which a cooling air inlet 22 is provided on the drive disc assembly side of the CVT system 1, and a cooling fan is provided on the outer side of the transmission housing cover 21. The air guide cover 3 has an air vent 31 facing the side of the vehicle body for external cooling air to enter. The external cooling air is guided into the transmission cover 21 through the cooling air flow path 6 via the first filter 4 and the second filter 5. This can prevent dust or foreign objects in the external cooling air from entering the transmission 2, thereby ensuring the cleanliness of the cooling air and improving the performance of the continuously variable transmission system 1.

The air vent 31 is provided with a plurality of guide plates 32 in the form of a fence slightly facing the vertical direction of the vehicle body. These guide plates 32 can divide the air vent 31 into several small external cooling air inlets 33. These guide plates 32 are respectively arranged at an angle facing the rear of the vehicle body and in a slightly parallel manner. The cooling air guide cover 3 is provided with a plurality of guide ribs 34 on the air vent 31 facing the front of the vehicle body. These guide ribs 34 define the cooling air flow path 6.

In this embodiment, the first filter element 4 has a first filter screen 42, and the second filter element 5 has a second filter screen 51, wherein the density of the first filter screen 42 is lower than the density of the second filter screen 51.

Because the density of the first filter 42 is relatively low, it facilitates the entry of external cooling air.

The first filter screen 42 and the second filter screen 51 have a plurality of filter pores, which may be, but are not limited to, paper, foam, cotton, spun glass fiber, or other known filter materials, woven or nonwoven materials, synthetic or natural materials, or any combination thereof.

The first filter element 4 has a third filter screen 41, which has greater rigidity than the first filter screen.

Preferably, the third filter 41 can be made of, but is not limited to, metal.

The third filter 41 is located between the outer side of the drive disc assembly 11 and the air guide hole 31, which can filter out larger dust or impurities and improve the installation stability of the first filter 42.

These impurities also include fine-grained sand or stones from the outside.

The third filter screen 41 and the first filter screen 42 can be easily disassembled simultaneously from the first filter element 4.

The first filter element 4 has an outer ring frame 43 and a plurality of ribs 44 for fixing the first filter screen 42.

The first filter element 4 is fixed to the cooling air guide cover 3 through the outer ring frame 43 and the ribs 44.

In this embodiment, the inner side of the cooling air guide cover 3 is surrounded by a sponge strip 35.

These sponge strips 35 prevent external cooling air from leaking out, achieving an airtight effect.

In this embodiment, the first filter element 4 includes a positioning hole 45 for fixing the first filter element 4 at the position of the air guide hole 31.

The positioning hole 45 allows it to be locked together with the cooling air guide cover 3 onto the transmission box cover 21 to avoid interfering with the transmission box cover 21 and to allow for a more compact configuration.

In this embodiment, the cooling air guide cover 3 has a plurality of guide ribs 34 to form the cooling airflow path 6.

In this embodiment, the cooling airflow path 6 is configured to guide the external cooling airflow radially inward through the first filter element 4 and the external cooling airflow radially inward through the second filter element 5.

The cooling airflow path 6 ensures that the external cooling air can flow directly to the cooling air inlet 22 of the transmission cover 21, thereby improving the performance of the continuously variable transmission system 1.

Please refer to Figures 2 and 3 simultaneously. Figure 2 is an exploded view of the transmission box 2 and the cooling air guide cover 3 in the filtration mechanism of a continuously variable transmission system according to the present invention; Figure 3 is an exploded view of the cooling air guide cover 3 and the filter element in the filtration mechanism of a continuously variable transmission system according to the present invention.

The continuously variable transmission (CVT) system 1 is installed inside the transmission housing 2. The CVT system 1 includes a drive disc assembly 11, a driven disc assembly 12, and a transmission belt 13 connecting the drive disc assembly 11 and the driven disc assembly 12. The transmission housing 2 has a transmission housing cover 21, on which a cooling air inlet 22 is provided on the side of the CVT system 1 near the drive disc assembly 11. The outer side of the transmission housing cover 21 is covered with... The cooling air guide cover 3 has an air vent 31 facing the side of the vehicle body for allowing external cooling air to enter. The external cooling air is guided into the transmission case cover 21 through the first filter 4 and the second filter 5 and the cooling air flow path 6. This prevents dust or foreign objects in the external cooling air from entering the transmission case 2, thereby ensuring the cleanliness of the cooling air and improving the performance of the continuously variable transmission system 1.

The cooling air guide cover 3 is located on the side of the drive disc assembly 11, and the air vent 31 faces the front or side of the vehicle body to facilitate the intake of external cooling air.

The air vent 31 is provided with a plurality of guide plates 32 in the form of a fence slightly facing the vertical direction of the vehicle body. These guide plates 32 can divide the air vent 31 into several small external cooling air inlets 33. These guide plates 32 are respectively arranged at an angle facing the rear of the vehicle body and in a slightly parallel manner. The cooling air guide cover 3 is provided with a plurality of guide ribs 34 on the air vent 31 facing the front of the vehicle body. These guide ribs 34 define the cooling air flow path 6.

In this embodiment, the first filter element 4 has a first filter screen 42, and the second filter element 5 has a second filter screen 51, wherein the density of the first filter screen 42 is lower than the density of the second filter screen 51.

Because the density of the first filter 42 is relatively low, it facilitates the entry of external cooling air.

The first filter screen 42 and the second filter screen 51 have a plurality of filter pores, which may be, but are not limited to, paper, foam, cotton, spun glass fiber, or other known filter materials, woven or nonwoven materials, synthetic or natural materials, or any combination thereof.

The first filter element 4 has a third filter screen 41, which has greater rigidity than the first filter screen.

Preferably, the third filter 41 can be made of, but is not limited to, metal.

The third filter 41 is located between the outer side of the drive disc assembly 11 and the air guide hole 31, which can filter out larger dust or impurities and improve the installation stability of the first filter 42.

These impurities also include fine-grained sand or stones from the outside.

The third filter screen 41 and the first filter screen 42 can be easily disassembled simultaneously from the first filter element 4.

The first filter element 4 has an outer ring frame 43 and a plurality of ribs 44 for fixing the first filter screen 42.

The first filter element 4 is fixed to the cooling air guide cover 3 through the outer ring frame 43 and the ribs 44.

In this embodiment, the inner side of the cooling air guide cover 3 is surrounded by a sponge strip 35.

These sponge strips 35 prevent external cooling air from leaking out, achieving an airtight effect.

In this embodiment, the first filter element 4 includes a positioning hole 45 for fixing the first filter element 4 at the position of the air guide hole 31.

The positioning hole 45 allows it to be locked together with the cooling air guide cover 3 onto the transmission box cover 21 to avoid interfering with the transmission box cover 21 and to allow for a more compact configuration.

In this embodiment, the cooling air guide cover 3 has a plurality of guide ribs 34 to form the cooling airflow path 6.

In this embodiment, the cooling airflow path 6 is configured to guide the external cooling airflow radially inward through the first filter element 4 and the external cooling airflow radially inward through the second filter element 5.

The cooling airflow path 6 ensures that the external cooling air can flow directly to the cooling air inlet 22 of the transmission cover 21, thereby improving the performance of the continuously variable transmission system 1.

Please refer to Figures 4 and 5 simultaneously. Figure 4 is a front view of the cooling air guide cover 3 in the filter mechanism of a continuously variable transmission system according to the present invention; Figure 5 is a rear view of the cooling air guide cover 3 in the filter mechanism of a continuously variable transmission system according to the present invention.

The cooling air guide cover 3 is installed on the outer side of the transmission box cover 21. The cooling air guide cover 3 has an air guide hole 31 for external cooling air to enter at the location corresponding to the passive plate assembly 12 of the continuously variable transmission system 1. The opening direction of the air guide hole 31 is towards the side of the vehicle body. The air guide hole 31 is provided with a plurality of guides in the form of a fence slightly facing the vertical direction of the vehicle body. The guide plates 32 divide the air vent 31 into several small external cooling air inlets 33. The guide plates 32 are arranged at an angle towards the rear of the vehicle body and in a slightly parallel manner. The cooling air guide cover 3 has a plurality of guide ribs 34 on the air vent 31 facing the front of the vehicle body. The guide ribs 34 define the cooling air flow path 6.

The cooling air guide cover 3 has an air vent 31 facing the side of the vehicle body for the entry of external cooling air. The external cooling air is guided into the transmission cover 21 through the cooling air flow path 6 via the first filter 4 and the second filter 5. This prevents dust or foreign objects in the external cooling air from entering the transmission 2, thereby ensuring the cleanliness of the cooling air and improving the performance of the continuously variable transmission system 1.

The first filter element 4 has an outer ring frame 43 and a plurality of ribs 44 for fixing the first filter screen 42.

The first filter element 4 is fixed to the cooling air guide cover 3 through the outer ring frame 43 and the ribs 44.

In this embodiment, the inner side of the cooling air guide cover 3 is surrounded by a sponge strip 35.

These sponge strips 35 prevent external cooling air from leaking out, achieving an airtight effect.

In this embodiment, the first filter element 4 includes a positioning hole 45 for fixing the first filter element 4 at the position of the air guide hole 31.

The positioning hole 45 allows it to be locked together with the cooling air guide cover 3 onto the transmission box cover 21 to avoid interfering with the transmission box cover 21 and to allow for a more compact configuration.

In this embodiment, the cooling air guide cover 3 has a plurality of guide ribs 34 to form the cooling airflow path 6.

In this embodiment, the cooling airflow path 6 is configured to guide the external cooling airflow radially inward through the first filter element 4 and the external cooling airflow radially inward through the second filter element 5.

The cooling airflow path 6 ensures that the external cooling air can flow directly to the cooling air inlet 22 of the transmission cover 21, thereby improving the performance of the continuously variable transmission system 1.

Please refer to Figure 6, which is a schematic diagram of the cooling airflow in the filter mechanism of a continuously variable transmission system according to the present invention.

The cooling air guide cover 3 is installed on the outer side of the transmission box cover 21. The cooling air guide cover 3 has an air vent 31 for allowing external cooling air to enter at the location corresponding to the passive sprocket assembly 12 of the continuously variable transmission 1. The air vent 31 opens towards the side of the vehicle body. The air vent 31 has a plurality of guide plates 32 in the form of a fence slightly facing the vertical direction of the vehicle body. These guide plates 32 divide the air vent 31 into several small external cooling air inlets 33. These guide plates 32 are respectively oriented towards the side of the vehicle body. The cooling air guide cover 3 is arranged at a rearward angle and in a slightly parallel manner. The cooling air guide cover 3 has a plurality of guide ribs 34 on the air guide hole 31 facing the front of the vehicle body. These guide ribs 34 define the cooling air flow path 6. When the outside cooling air enters the air guide hole 31, it passes through the first filter 4 and is guided through the cooling air flow path 6 to the second filter 5, and then enters the transmission box cover 21. This can prevent dust or foreign objects in the outside cooling air from entering the transmission box 2, thereby ensuring the cleanliness of the cooling air and improving the performance of the continuously variable transmission system 1.

Please refer to Figure 7, which is a schematic diagram of a continuously variable transmission (CVT) filter mechanism used in a vehicle according to the present invention.

The present invention is implemented in a vehicle, exemplified by a straddle-type vehicle (motorcycle) 7. The straddle-type vehicle 7 has a frame unit 71, on which a power-generating engine unit is connected. A front wheel 72 is supported at the front end of the frame unit 71. Above and supported on the frame unit 71 is a steering mechanism 73 for turning the straddle-type vehicle 7. Above the rear end of the frame unit 71 is a... A seat 74 for the driver to sit on, with a storage box 75 for storing items underneath the seat 74; a fuel tank 76 (or battery) is provided between the front wheel 72 and the seat 74 in the frame unit 71; the engine unit has a crankcase for housing the crankshaft, the crankshaft is connected to a piston, and the drive plate assembly 11 of the continuously variable transmission 1 is mounted on the crankshaft of the engine unit; a rear swing arm is provided at the rear hub of the crankcase, and a rear wheel 77 is provided at the rear hub of the rear swing arm; the rear swing arm can swing freely up and down with the axis of the passive plate assembly 12 of the continuously variable transmission 1 as the swing center.

When the engine unit starts, it drives the drive plate assembly 11 of the continuously variable transmission system 1 in the transmission case 2 to rotate. This causes the drive plate assembly 11 to create a negative pressure suction force within the transmission case 2, drawing external cooling air from the front of the vehicle body at an angle through the air vent 31 of the cooling air guide cover 3 into the cooling air guide cover 3, as shown by the arrow in Figure 6. The air then passes through the first filter element 4. After the first filtration, the cooling airflow is guided by the cooling airflow path 6 defined by the guide rib 34 and flows towards the front of the vehicle body between the cooling air guide cover 3 and the transmission box cover 21 of the transmission box 2. After the second filtration by the second filter element 5, the airflow is drawn into the transmission box 2 through the cooling air inlet 22 to cool the continuously variable transmission system 1, thereby improving the performance of the continuously variable transmission system 1.

In summary, the continuously variable transmission (CVT) system of this invention employs a multi-layer filtration structure, adding two layers of dust-proof filtration inside the cooling air guide cover, thereby improving the problem of dust accumulation in traditional filters. After cooling air is introduced through the air duct, larger dust and impurities are filtered out by the first filter element. The pre-filtered cooling air is then guided along the cooling airflow path to the second filter element for a second filtration. This effectively reduces dust and impurities in the cooling air, preventing dust from entering the continuously variable transmission (CVT) system and causing belt wear or damage to the CVT system. This achieves a better cooling effect. Furthermore, the density of the first filter element is lower than that of the second filter element, which facilitates air intake.

Although the present invention has been disclosed above with the aforementioned embodiments, it is not intended to limit the present invention. Any equivalent substitutions made by those skilled in similar techniques without departing from the spirit and scope of the present invention shall still be within the scope of the patent protection of the present invention.

1: Continuously Variable Transmission (CVT)

11: Drive Panel Assembly

12: Passive Disc Set

13: Drive belt

2: Transmission box

21: Transmission box cover

22: Cooling air inlet

3: Cooling air guide cover

31: Air guide hole

32: Guide film

33: External cooling air enters the entrance

34: Guide ribs

35: Sponge

4: First filter element

41: Third Filter

42: First Filter

43: Outer ring frame

44: Ribs

45: Positioning hole

5: Second filter element

51: Second Filter

6: Cooling airflow path

7: Horizontal motorcycle

71: Chassis Unit

72:Front wheel

73: Turning point

74: Seat cushion

75: Storage Box

76: Fuel tank

77:Rear wheel

Figure 1 is a cross-sectional view of a filter mechanism of a continuously variable transmission system according to the present invention;

Figure 2 is an exploded view of the transmission box and cooling air guide cover in the filter mechanism of a continuously variable transmission system according to the present invention;

Figure 3 is an exploded view of the cooling air guide cover and filter element in the filter mechanism of a continuously variable transmission system according to the present invention;

Figure 4 is a front view of the cooling air guide cover in the filter mechanism of a continuously variable transmission system according to the present invention;

Figure 5 is a rear view of the cooling air guide cover in the filter mechanism of a continuously variable transmission system according to the present invention;

Figure 6 is a schematic diagram of the cooling airflow in the filtration mechanism of a continuously variable transmission system according to the present invention;

Figure 7 is a schematic diagram of a continuously variable transmission (CVT) filter mechanism used in a vehicle according to the present invention.

1: Continuously Variable Transmission (CVT)

11: Drivetrain

12: Passive Disc Set

13: Drive belt

2: Transmission box

21: Transmission box cover

22: Cooling air inlet

3: Cooling air guide cover

31: Air guide hole

4: First Filter

5: Second filter element

6: Cooling Pathway

Claims (10)

A filtration mechanism for a continuously variable transmission (CVT) system, the CVT being installed in a transmission case of a vehicle body, the transmission case having a transmission case cover with a cooling air inlet and a cooling air guide cover disposed on the outside of the transmission case cover, and having an air guide hole for external cooling air to enter, the filtration mechanism comprising: a first filter element located on the cooling air guide cover; a second filter element located outside the cooling air inlet in the transmission case cover; and a cooling air flow path extending continuously from the air guide hole through the first filter element and the second filter element to the transmission case cover. The continuously variable transmission (CVT) system filtration mechanism as described in claim 1, wherein the CVT system includes: a drive disc assembly; a passive disc assembly; and a transmission belt connecting the two, and the cooling air guide cover is located on the side of the drive disc assembly, and the air vent faces the front or side of the vehicle body to facilitate the intake of external cooling air. The continuously variable transmission (CVT) system filtration mechanism as described in claim 1, wherein the first filter element has a first filter screen, the second filter element has a second filter screen, and the density of the first filter screen is lower than the density of the second filter screen. The filtration mechanism of the continuously variable transmission system as described in claim 1, wherein the first filter element has a first filter screen and a third filter screen, the third filter screen having greater rigidity than the first filter screen. The filtration mechanism of the continuously variable transmission system as described in claim 4, wherein the first filter element has an outer ring and a plurality of ribs for fixing the first filter screen. The filtration mechanism of the continuously variable transmission system as described in claim 4, wherein the third filter and the first filter can be easily removed simultaneously from the first filter element. The filter mechanism of the continuously variable transmission system as described in claim 1, wherein the cooling air guide cover has a sponge wrapped around its inner side. The continuously variable transmission (CVT) system filtration mechanism as described in claim 1, wherein the first filter element includes a positioning hole for fixing the first filter element at the air guide hole position. The filtration mechanism of the continuously variable transmission system as described in claim 1, wherein the cooling air guide cover has a plurality of guide ribs to form the cooling airflow path. The continuously variable transmission (CVT) system filtration mechanism as described in claim 1, wherein the cooling airflow path is configured to guide the external cooling air radially inward through the first filter and the external cooling air radially inward through the second filter.