Motorcycle drive assembly

Abstract

The utility model provides a motorcycle drive assembly cooperates with engine use and contains: drive cover body, driving disc group, driven disc group and drive belt, drive cover body is connected in engine, makes drive cover body and engine form drive chamber between, and drive cover body is equipped with the flow guide wall in the inside of drive chamber, and driving disc group, driven disc group and drive belt all are located in the inside of drive chamber, in addition, one end of drive belt is held by the fan blade disc and the pli disc of driving disc group, and the other end of drive belt is held by the inside and outside open and close disc of driven disc group, wherein, when engine drives fan blade disc to rotate, the inside of drive chamber can form cooling airflow, cooling airflow can flow to engine along flow guide wall to cool drive belt, and further part cooling airflow can flow to pli disc, thereby, temperature difference between fan blade disc and pli disc can be effectively reduced, also can avoid because of temperature difference between fan blade disc and pli disc and influence the friction coefficient of belt.

Description

Technical Field

[0001] This utility model relates to a motorcycle transmission assembly installed between the engine and the rear wheel, and more particularly to a motorcycle transmission assembly using a continuously variable transmission (CVT) system. When the motorcycle engine drives the rear wheel to rotate through the transmission assembly, it can effectively dissipate heat from the fan disc and the pulley disc, avoiding a serious temperature difference between the fan disc and the pulley disc. Background Technology

[0002] Motorcycles are easy to operate, convenient to park, and highly maneuverable, making them the most widely used mode of transportation. Please refer to [link / reference]. Figure 1 As shown, the commonly used motorcycle transmission assembly 60 generally adopts a conventional continuously variable transmission (CVT) system, which mainly consists of five parts: a pulley assembly 61, a fan disc 62, a drive belt 63, an opening and closing disc assembly 64, and a transmission cover 65. When the engine is running, the pulley assembly 61 rotates, causing multiple jacks (not shown) in the pulley assembly 61 to move within the pulley 611 of the pulley assembly 61 through centrifugal force. The sliding action causes multiple jacks to push against the jack disc 611, bringing the jack disc 611 closer to the fan disc 62. Consequently, the jack disc 611 and the fan disc 62 together push against the front end of the transmission belt 63, causing the front end of the transmission belt 63 to expand outward. When the front end of the transmission belt 63 expands outward, the rear end of the transmission belt 63 contracts inward to open the two opening and closing discs of the opening and closing disc assembly 64, allowing the transmission belt 63 to drive the clutch (not shown) located on one side of the opening and closing discs to rotate.

[0003] As shown in the figure, when the pulley 611 of the pulley assembly 61 rotates, the fan blade 62 rotates synchronously with the pulley 611. The rotating fan blade 62 generates a cooling airflow 66 that flows into the transmission cover 65. The cooling airflow 66 flows along the tangential direction of the fan blade 62, resulting in a turbulent airflow distribution inside the transmission cover 65. Consequently, the cooling airflow 66 cannot flow evenly to the pulley assembly 61 and the opening / closing disc assembly 64. Furthermore, when the cooling airflow 66 flows inside the transmission cover 65, it mainly concentrates towards the air outlet of the transmission cover 65 (not shown in the figure). However, the air outlet of the transmission cover 65 is usually located in the central area or at the rear of the transmission cover 65, causing the airflow to become turbulent. The air inlet is close to the opening and closing disc assembly 64, so most of the cooling airflow 66 flows to the air outlet to dissipate heat from the opening and closing disc assembly 64. Only a small portion of the cooling airflow 66 flows to the pulley assembly 61, which means that the cooling airflow 66 cannot effectively reduce the temperature of the pulley assembly 61. This results in an excessively large temperature difference between the pulley assembly 61 and the fan blade disc 62, further affecting the temperature distribution on both sides of the drive belt 63. This leads to an imbalance where one side of the drive belt 63 is at a high temperature and the other side is at a low temperature, which will affect the friction coefficient of the drive belt 63. This may further accelerate the aging of the drive belt 63 or even cause it to break. This will have a serious negative impact on the stability and service life of the pulley assembly 611 and the fan blade disc 62. Utility Model Content

[0004] The main purpose of this utility model is to provide a motorcycle transmission assembly with an improved structural design. The improved motorcycle transmission assembly can extend the residence time of the cooling airflow inside the transmission cover, preventing the cooling airflow from flowing directly to the air outlet of the transmission cover after entering the transmission cover, thus reducing the cooling effect on the drive disc assembly. This can extend the contact time between the cooling airflow and the drive disc assembly, allowing the drive disc assembly to effectively dissipate heat through the cooling airflow. Furthermore, it can prevent the temperature difference between the fan disc and the pulley disc from affecting the friction coefficient of the belt, thereby increasing the service life and durability of the motorcycle transmission assembly.

[0005] To achieve the aforementioned objectives, this utility model provides a motorcycle transmission assembly for use with an engine, characterized in that it comprises:

[0006] A transmission belt has a front clamped section, a lower connecting part, a rear clamped section and an upper connecting part in sequence. The front clamped section and the rear clamped section are located on opposite sides of the transmission belt, and the two ends of the lower connecting part and the two ends of the upper connecting part are respectively connected to the front clamped section and the rear clamped section.

[0007] An active disc assembly is connected to the engine and has a fan disc and a pulley disc arranged on one side of the fan disc, the fan disc and the pulley disc being clamped together in the front clamped section.

[0008] A driven disk assembly, comprising an inner opening / closing disk and an outer opening / closing disk arranged on one side of the inner opening / closing disk, wherein the inner opening / closing disk and the outer opening / closing disk are clamped in the rear clamped section; and

[0009] A transmission cover has an open end and a closed end on opposite sides. The open end is connected to the engine, and the closed end and the engine form a transmission chamber for accommodating the transmission belt, the drive disc assembly, and the driven disc assembly. The transmission cover has an air inlet communicating with the transmission chamber and an air outlet communicating with the transmission chamber. It also has a guide wall located inside the transmission chamber, which is used to change the direction of airflow and can cross from the upper connecting part to the lower connecting part.

[0010] The fan blade is rotated by the engine, which draws a cooling airflow from the air inlet to the fan blade. The cooling airflow is driven by the fan blade to flow toward the guide wall. The cooling airflow collides with the guide wall and flows toward the opening end. When the cooling airflow collides with the engine, it splits into a first branch of cold airflow flowing toward the fan blade and a second branch of cold airflow flowing toward the air outlet.

[0011] In the motorcycle transmission assembly, the guide wall has an airflow concentrating recess spaced apart from the fan blade and an airflow guiding portion adjacent to the fan blade. The airflow concentrating recess forms an airflow channel and an airflow guiding surface located inside the airflow channel. The airflow guiding surface can guide the cooling airflow from the airflow channel to the opening end, and the airflow guiding portion is tangential to the wall surface of the transmission cover, so that the airflow guiding portion cooperates with the wall surface of the transmission cover to guide the cooling airflow into the interior of the airflow channel.

[0012] In the motorcycle transmission assembly, the airflow concentrating recesses are arranged adjacent to the lower connecting portion, such that the lower connecting portion spans the airflow concentrating recesses, and the airflow guiding portions are arranged adjacent to the upper connecting portion, such that the upper connecting portion spans the airflow guiding portions.

[0013] In the motorcycle transmission assembly, the ratio of the height of the guide wall to the height of the fan blade is between 0.5 and 1.

[0014] The motorcycle transmission assembly, wherein the transmission cover comprises:

[0015] A transmission chamber cover has an open end, a closed end, an air inlet, and an air outlet, and a partition extends from the closed end toward the open end to form a partition, the partition being located between the air inlet and the air outlet; and

[0016] A cover plate has a plate body with a profile smaller than the opening end, and extends from the plate body to form the flow guide wall, and the cover plate is connected to the transmission chamber cover such that the plate body can contact the partition, and the plate bodies can be arranged intersectingly on the partition.

[0017] The motorcycle transmission assembly, wherein the transmission chamber is divided by the partition and the plate into an air inlet space between the closed end and the plate, an air outlet space between the closed end and the plate, and a flow space between the engine and the plate. The air inlet space is connected to the air inlet, and the air outlet space is connected to the air outlet. The driving disc assembly, the driven disc assembly, and the transmission belt are all located in the flow space.

[0018] The feature of this invention is that the transmission cover is provided with a guide wall to direct airflow to the opening end of the transmission cover. When the fan blade of the drive disc rotates through the engine, it generates cooling airflow. The cooling airflow can flow along the guide wall to change its direction, allowing it to flow towards the opening end of the transmission cover. This allows the cooling airflow to pass through the transmission belt and contact the engine. The cooling airflow is then split into two branches, flowing to the pulley and the exhaust port respectively. This effectively increases the residence time of the cooling airflow inside the transmission cover, thereby extending the contact time between the cooling airflow and the drive disc. As a result, the drive disc can effectively dissipate heat through the cooling airflow to reduce the temperature difference between the fan blade and the pulley, and it also prevents the temperature difference between the fan blade and the pulley from affecting the friction coefficient of the belt, thus increasing the service life and durability of the motorcycle transmission assembly. Attached Figure Description

[0019] Figure 1 A perspective view of an existing motorcycle transmission assembly;

[0020] Figure 2 This is a perspective view of the motorcycle transmission assembly of this utility model;

[0021] Figure 3 This is an exploded view of the motorcycle transmission assembly of this utility model;

[0022] Figure 4 This is a side view of the motorcycle transmission assembly of this utility model;

[0023] Figure 5 This is a cross-sectional view of the motorcycle transmission assembly of this utility model;

[0024] Figure 6A A schematic diagram showing the cooling airflow generated by the rotation of the fan blades;

[0025] Figure 6B This is a schematic diagram showing the flow of cooling air towards the engine.

[0026] Explanation of reference numerals in the attached drawings: 1-Motorcycle transmission assembly; 10-Transmission cover; 11-Transmission chamber cover; 111-Open end; 112-Closed end; 113-Air inlet; 114-Air outlet; 115-Baffle; 12-Cover plate; 121-Plate; 121a-Opening; 122-Guide wall; 122a-Airflow concentration recess; 122b-Airflow guide; 122c-Airflow channel; 122d-Airflow guide surface; 20-Driven disc assembly; 21-Fan blade disc; 22-Pulley disc; 30-Driven disc assembly; 31-Internal opening / closing disc. ; 32-Outer opening and closing disc; 40-Drive belt; 41-Front clamp section; 42-Lower connecting part; 43-Rear clamp section; 44-Upper connecting part; 50-Engine; A1-Cooling airflow; A2-First branch cold airflow; A3-Second branch cold airflow; S1-Transmission chamber; S2-Intake space; S3-Outtake space; S4-Circulation space; 60-Existing motorcycle transmission assembly; 61-Pulley assembly; 611-Pulley; 62-Fan blade disc; 63-Drive belt; 64-Opening and closing disc assembly; 65-Transmission cover; 66-Cooling airflow. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present invention will become clearer with the description.

[0028] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the motorcycle transmission assembly 1 of this utility model is used in conjunction with an engine 50. The motorcycle transmission assembly 1 mainly consists of a transmission cover 10, a drive disc assembly 20, a driven disc assembly 30, and a transmission belt 40. The transmission cover 10 has two parts: a transmission chamber cover 11 and a cover plate 12. The transmission chamber cover 11 is hollow, and has an open end 111 and a closed end 112 on opposite sides. The transmission chamber cover 11 also has an air inlet 11 communicating with the interior of the transmission chamber cover 11. 3. An air outlet 114 is connected to the inside of the transmission chamber cover 11. As shown in the figure, the transmission chamber cover 11 extends from the closed end 112 toward the open end 111 to form a partition 115 located inside the transmission chamber cover 11. The partition 115 is located between the air inlet 113 and the air outlet 114. In this embodiment, the open end 111 of the transmission chamber cover 11 is connected to the engine 50, so that a transmission chamber S1 is formed between the closed end 112 of the transmission chamber cover 11 and the engine 50. The transmission chamber S1 can be connected to both the air inlet 113 and the air outlet 114.

[0029] like Figure 3 , Figure 4 and Figure 5As shown, the cover plate 12 of the transmission cover 10 has two parts: a plate 121 and a guide wall 122. The outline of the plate 121 is smaller than the outline of the opening end 111 of the transmission chamber cover 11. A portion of the plate 121 extends through to form an opening 121a. In this embodiment, the plate 121 is connected to the opening end 111 of the transmission chamber cover 11, so that the cover plate 12 is located inside the transmission chamber S1. When the cover plate 12 is connected to the transmission chamber cover 11, the plate 121 can contact the partition 115 of the transmission chamber cover 11 to be spaced apart in the transmission chamber. The closed end 112 of the chamber cover 11, and the plate 121, can be arranged intersectingly on the partition 115. At the same time, the opening 121a is located on the crankshaft (not shown) of the engine 50. The transmission chamber S1 is divided by the partition 115 and the plate 121 into an air intake space S2 between the closed end 112 and the plate 121, an air outlet space S3 between the closed end 112 and the plate 121, and a flow space S4 between the engine 50 and the plate 121. The air intake space S2 is located on one side of the partition 115 and communicates with the air intake 113. The air outlet space S3 is located on the other side of the partition 115 and connects to the air outlet 114, so that the air inlet space S2 and the air outlet space S3 are located on opposite sides of the partition 115. In addition, the guide wall 122 is formed on one side of the plate 121 and located inside the flow space S4. In this embodiment, the guide wall 122 is used to change the flow direction of the airflow. The guide wall 122 is provided with an airflow concentrating recess 122a spaced apart from the opening 121a and an airflow guiding portion 122b adjacent to the opening 121a. The airflow concentrating recess 122a... An airflow channel 122c and an airflow guiding surface 122d located inside the airflow channel 122c are formed. The airflow guiding surface 122d is located at the junction between the airflow concentration recess 122a and the plate 121. The airflow guiding surface 122d can guide the airflow from the airflow channel 122c to the opening end 111. The appearance of the airflow guiding part 122b is curved so as to be tangent to the wall of the transmission cover 10, so that the airflow guiding part 122b can guide the airflow into the interior of the airflow channel 122c in cooperation with the wall of the transmission cover 10.

[0030] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the active disc assembly 20 is disposed inside the flow space S4 of the transmission chamber S1, and is connected to the crankshaft of the engine 50. The active disc assembly 20 has a fan disc 21 and a pulley disc 22. The fan disc 21 is positioned near the air inlet 113 of the transmission cover 10 through an opening 121a on the plate 121, such that the airflow guiding portion 122b of the guide wall 122 is adjacent to the fan disc 21, while the airflow concentrating recess 122a of the guide wall 122 is spaced apart from the fan disc 21. The pulley discs 22 are spaced apart on one side of the fan disc 21, close to the engine 50. In a preferred embodiment, the ratio of the height of the guide wall 122 to the height of the fan disc 21 is between 0.5 and 1. Additionally, the driven disc assembly 30 is disposed inside the flow space S4 of the transmission chamber S1, and is connected to the crankshaft of the engine 50 via a reduction mechanism. (Not shown) Connected to a rear wheel (not shown), wherein the driven disc assembly 30 has an inner opening and closing disc 31 and an outer opening and closing disc 32. The inner opening and closing disc 31 is close to the engine 50, while the outer opening and closing discs 32 are spaced apart on one side of the inner opening and closing disc 31, close to the opening end 111. However, the drive belt 40 is disposed inside the flow space S4 of the transmission chamber S1, located on one side of the opening end 111. The drive belt 40 has a front clamped section 41, a lower connecting portion 42, a rear clamped section 43, and an upper connecting portion 44 in sequence. The front clamped section 41 and the rear clamped section 43 are located on opposite sides of the drive belt 40, and the two ends of the lower connecting portion 42 are connected to the front clamped section 41 and the rear clamped section 43 respectively. Similarly, the two ends of the upper connecting portion 44 are connected to the front clamped section 41 and the rear clamped section 43 respectively, so that the drive belt 40 presents a loop shape, as shown. Figure 5 As shown, the front clamped section 41 is clamped by the fan blade disk 21 and the pulley disk 22, while the rear clamped section 43 is clamped by the inner opening and closing disk 31 and the outer opening and closing disk 32. In this embodiment, when the drive belt 40 is connected to the driving disk group 20 and the driven disk group 30, the airflow concentration recess 122a of the guide wall 122 is arranged adjacent to the lower connecting portion 42, allowing the lower connecting portion 42 to span across the airflow concentration recess 122a, while the airflow guiding portion 122b is arranged adjacent to the upper connecting portion 44, allowing the upper connecting portion 44 to span across the airflow guiding portion 122b, so that the guide wall 122 can span across the lower connecting portion 42 from the upper connecting portion 44.

[0031] Please see Figure 6A and Figure 6B As shown, this is a specific application of the motorcycle transmission assembly 1 in conjunction with the engine 50. First, as... Figure 6AAs shown, the engine 50 simultaneously drives the fan blade 21 and the pulley 22 of the active disc assembly 20 to rotate. The rotating fan blade 21 can form a cooling airflow A1. The cooling airflow A1 first flows from the air inlet 113 of the transmission cover 10 to the opening 121a of the cover plate 12, so that the cooling airflow A1 flows to the fan blade 21 through the opening 121a. Then, the cooling airflow A1 flows along the tangential direction of the fan blade 21. A portion of the cooling airflow A1 flows along the airflow guide part 122b of the guide wall 122 and the wall of the transmission cover 10 to the airflow channel 122c of the airflow concentration recess 122a. The remaining portion of the cooling airflow A1 flows directly into the interior of the airflow channel 122c.

[0032] like Figure 6B As shown, when the cooling airflow A1 flows into the airflow channel 122c of the airflow concentration recess 122a, the cooling airflow A1 contacts the airflow guiding surface 122d of the guide wall 122, causing the cooling airflow A1 to flow along the airflow guiding surface 122d toward the opening end 111 of the transmission chamber cover 11. Then, the cooling airflow A1 will first contact the transmission belt 40, allowing the transmission belt 40 to dissipate heat through the cooling airflow A1. Next, after passing the transmission belt 40, the cooling airflow A1 will contact the engine 50, and then the cooling airflow A1 will split into a first branch cold flow A2 and a second branch cold flow A3. The first branch cold flow A2 flows into the drive disc assembly 20 to dissipate heat on the pulley 22, while the second branch cold flow A3 flows to the air outlet 114 that flows sequentially through the driven disc assembly 30 and the transmission cover 10, allowing the second branch cold flow A3 to dissipate heat on the driven disc assembly 30.

[0033] The above description is illustrative only and not restrictive. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all such modifications, variations or equivalents will fall within the protection scope of this utility model.

Claims

1. A motorcycle transmission assembly, used in conjunction with an engine, characterized in that, Include: A transmission belt has a front clamped section, a lower connecting part, a rear clamped section and an upper connecting part in sequence. The front clamped section and the rear clamped section are located on opposite sides of the transmission belt, and the two ends of the lower connecting part and the two ends of the upper connecting part are respectively connected to the front clamped section and the rear clamped section. An active disc assembly is connected to the engine and has a fan blade disc and a pulley disc arranged on one side of the fan blade disc, wherein the fan blade disc and the pulley disc are clamped together in the front clamped section. A driven disk assembly, comprising an inner opening / closing disk and an outer opening / closing disk arranged on one side of the inner opening / closing disk, wherein the inner opening / closing disk and the outer opening / closing disk are clamped in the rear clamped section; and A transmission cover has an open end and a closed end on opposite sides. The open end is connected to the engine, and the closed end and the engine form a transmission chamber for accommodating the transmission belt, the drive disc assembly, and the driven disc assembly. The transmission cover has an air inlet communicating with the transmission chamber and an air outlet communicating with the transmission chamber. It also has a guide wall located inside the transmission chamber, which is used to change the direction of airflow and can cross from the upper connecting part to the lower connecting part. The fan blade is rotated by the engine, which draws a cooling airflow from the air inlet to the fan blade. The cooling airflow is driven by the fan blade to flow toward the guide wall. The cooling airflow collides with the guide wall and flows toward the opening end. When the cooling airflow collides with the engine, it splits into a first branch of cold airflow flowing toward the fan blade and a second branch of cold airflow flowing toward the air outlet.

2. The motorcycle transmission assembly according to claim 1, characterized in that, The guide wall is provided with an airflow concentrating recess spaced apart from the fan blade disk and an airflow guiding portion adjacent to the fan blade disk. The airflow concentrating recess forms an airflow channel and an airflow guiding surface located inside the airflow channel. The airflow guiding surface can guide the cooling airflow from the airflow channel to the opening end, while the airflow guiding portion is tangent to the wall surface of the transmission cover, so that the airflow guiding portion cooperates with the wall surface of the transmission cover to guide the cooling airflow into the interior of the airflow channel.

3. The motorcycle transmission assembly according to claim 2, characterized in that, The airflow concentrating recesses are arranged adjacent to the lower connecting portion, such that the lower connecting portion spans the airflow concentrating recesses, while the airflow guiding portions are arranged adjacent to the upper connecting portion, such that the upper connecting portion spans the airflow guiding portion.

4. The motorcycle transmission assembly according to claim 1, characterized in that, The ratio of the height of the guide wall to the height of the fan blade disk is between 0.5 and 1.

5. The motorcycle transmission assembly according to claim 1, characterized in that, The transmission cover includes: A transmission chamber cover is provided with an open end, a closed end, an air inlet and an air outlet, and a partition extends from the closed end toward the open end to form a partition, and the partition is located between the air inlet and the air outlet. as well as A cover plate has a plate body with a profile smaller than the opening end, and extends from the plate body to form the flow guide wall, and the cover plate is connected to the transmission chamber cover such that the plate body can contact the partition, and the plate bodies can be arranged intersectingly on the partition.

6. The motorcycle transmission assembly according to claim 5, characterized in that, The transmission chamber is divided by the partition and the plate into an air inlet space between the closed end and the plate, an air outlet space between the closed end and the plate, and a flow space between the engine and the plate. The air inlet space is connected to the air inlet, and the air outlet space is connected to the air outlet. The driving disc assembly, the driven disc assembly, and the transmission belt are all located in the flow space.

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