A continuously variable transmission with adjustable transmission ratio characteristic curve

Abstract

The present invention discloses a continuously variable transmission with adjustable transmission ratio characteristic curve, comprising a shaft sleeve, a spring seat, a moving wheel, a sliding cover and a spring, and also comprising a swing arm, a cylindrical roller, a ramp guide block and an eccentric bolt assembly; one end of the swing arm is hinged on the spring seat, and the other end of the swing arm is connected to the cylindrical roller; the ramp guide block is hinged on the moving wheel; the eccentric bolt assembly comprises an eccentric bolt and a nut, one side of the ramp guide block leans against the eccentric cylindrical section, and the other side of the ramp guide block is provided with a guide ramp leaning against the cylindrical roller. The continuously variable transmission with adjustable transmission ratio characteristic curve of the present invention can change the transmission ratio characteristic curve of the transmission by adjusting the installation position of the eccentric bolt, so that the speed change can better meet the driving needs of vehicles in different regions.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a continuously variable transmission. Background Art

[0002] Motorcycles are a mobile and flexible means of transportation, and are widely used in mountains and plains. However, the requirements for the speed change performance of a motorcycle's continuously variable transmission are different when it is traveling in mountains and plains. For example, when a motorcycle is often traveling in the mountains, the vehicle will often be started on uphill sections. At this time, the vehicle's continuously variable transmission is required to have a large torque output at low speed to ensure the vehicle's climbing needs. Therefore, the transmission ratio characteristic curve of the continuously variable transmission of motorcycles commonly used in mountains should be flatter, and the acceleration process from low speed to high speed should take longer; and when the vehicle is often traveling on flat ground, it is necessary to give priority to meeting the requirements of the vehicle's acceleration performance and vehicle speed. Therefore, the transmission ratio characteristic curve of the continuously variable transmission should be steeper, and the acceleration process from low speed to high speed should take shorter time. However, the existing continuously variable transmission for motorcycles, as shown in the attached manual, Figure 1 As shown, the installation position and shape of the arc-shaped roller 1 and the cylindrical roller 2 used to determine the transmission ratio characteristic curve of the continuously variable transmission are indefinite and cannot be changed, which makes the transmission ratio characteristic curve of the continuously variable transmission unadjustable, and thus the same continuously variable transmission cannot conveniently meet the different speed change performance requirements of the vehicle when driving on mountainous and flat lands. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a continuously variable transmission with an adjustable transmission ratio characteristic curve, so as to solve the technical problem that the transmission ratio characteristic curve of the existing continuously variable transmission cannot be adjusted, making it impossible for the continuously variable transmission to conveniently meet the different requirements for speed shifting performance when the vehicle is traveling on two different road conditions, mountainous and flat.

[0004] The continuously variable transmission with adjustable transmission ratio characteristic curve of the present invention comprises a shaft sleeve, a spring seat, a moving wheel, a sliding cover and a spring, wherein the spring seat is fixed at the middle of the shaft sleeve, the moving wheel and the sliding cover are located at both sides of the spring seat, the moving wheel and the sliding cover are sleeved on the shaft sleeve in a manner of being movable in the axial direction, the moving wheel and the sliding cover are fixedly connected, one end of the spring is pressed against the spring seat, and the other end of the spring is pressed against the sliding cover, and further comprises a swing arm, a cylindrical roller, a ramp guide block and an eccentric bolt assembly;

[0005] One end of the swing arm is hinged on the spring seat, and the other end of the swing arm is connected to the cylindrical roller;

[0006] The inclined plane guide block is hinged on the moving wheel;

[0007] The eccentric bolt assembly comprises an eccentric bolt and a nut. The eccentric bolt has an eccentric cylindrical section. The moving wheel is provided with a hexagonal hole matched with the hexagonal head of the eccentric bolt. The eccentric bolt is passed through the moving wheel, the head of the eccentric bolt is embedded in the hexagonal hole, and the other end of the eccentric bolt is connected to the nut.

[0008] One side of the inclined surface guide block leans against the eccentric cylindrical section, and the other side of the inclined surface guide block is provided with a guiding inclined surface leaning against the cylindrical roller.

[0009] Furthermore, an anti-loosening spring is sleeved on the eccentric bolt, one end of the anti-loosening spring presses against the nut, and the other end of the anti-loosening spring presses against the moving wheel.

[0010] Beneficial effects of the present invention:

[0011] The continuously variable transmission with adjustable transmission ratio characteristic curve of the present invention has an adjustable installation position of the eccentric bolt. When the installation position of the eccentric bolt rotates an angle, the angle of the eccentric cylindrical section on it changes accordingly, which in turn changes the angle of the inclined guide block leaning against the eccentric cylindrical section, which in turn changes the angle of the guide inclined surface that cooperates with the cylindrical roller during the speed change process, so that the transmission ratio characteristic curve of the transmission changes. Therefore, when the motorcycle using the transmission is mainly driven in the mountains, the transmission ratio characteristic curve can be adjusted to be gentler by changing the position of the eccentric bolt to ensure the output torque of the transmission and meet its climbing performance; and when the motorcycle using the transmission is mainly driven on flat terrain, the transmission ratio characteristic curve can be adjusted to be steeper by changing the position of the eccentric bolt so that the vehicle can quickly accelerate from low speed to high speed to ensure the acceleration performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an existing continuously variable transmission;

[0013] Figure 2 It is a schematic diagram of the structure of a continuously variable transmission with an adjustable transmission ratio characteristic curve;

[0014] Figure 3 It is a schematic diagram of the cooperation between the guide wheel and the guide groove;

[0015] Figure 4 is a side view of the moving wheel;

[0016] Figure 5 It is a structural schematic diagram of an eccentric bolt;

[0017] Figure 6 Schematic diagram of the eccentric bolt installed on the moving wheel. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] As shown in the figure, the continuously variable transmission with adjustable transmission ratio characteristic curve in this embodiment includes a shaft sleeve 3, a spring seat 4, a moving wheel 5, a sliding cover 6 and a spring 7. The spring seat is fixed in the middle of the shaft sleeve, the moving wheel and the sliding cover are located on both sides of the spring seat, the moving wheel and the sliding cover are sleeved on the shaft sleeve in a manner that they can move in the axial direction, the moving wheel and the sliding cover are fixedly connected, one end of the spring is pressed against the spring seat, and the other end of the spring is pressed against the sliding cover. During the speed change process, the moving wheel and the sliding cover move in the axial direction at the same time.

[0020] The continuously variable transmission with adjustable transmission ratio characteristic curve in this embodiment is provided with a guide groove 8 parallel to the axial direction of the sleeve on its moving wheel, and a guide wheel 9 slidingly matched with the guide groove is provided on the spring seat. The moving wheel is guided in axial movement by the cooperation between the guide wheel and the guide groove, thereby avoiding relative rotation between the moving wheel and the sleeve.

[0021] The continuously variable transmission with adjustable transmission ratio characteristic curve in this embodiment further includes a swing arm 10, a cylindrical roller 11, a ramp guide block 12 and an eccentric bolt assembly.

[0022] One end of the swing arm is hinged on the spring seat, and the other end of the swing arm is connected to the cylindrical roller by a bolt 13. Of course, in different embodiments, the bolt 13 can also be replaced with a connector in the form of other rivets, pins, etc.

[0023] The inclined surface guide block is hinged on the moving wheel. Specifically, the inclined surface guide block is sleeved on the pin shaft 14, and the pin shaft is arranged on the moving wheel.

[0024] The eccentric bolt assembly includes an eccentric bolt 15 and a nut 16. The eccentric bolt has an eccentric cylindrical section 151. The moving wheel is provided with a hexagonal hole 51 that matches the hexagonal head 152 of the eccentric bolt. The eccentric bolt is passed through the moving wheel, the head of the eccentric bolt is embedded in the hexagonal hole, and the other end of the eccentric bolt is connected to the nut. The hexagonal hole can prevent the eccentric bolt from rotating.

[0025] One side of the inclined surface guide block leans against the eccentric cylindrical segment, and the other side of the inclined surface guide block is provided with a guiding inclined surface 121 leaning against the cylindrical roller.

[0026] In the continuously variable transmission with adjustable transmission ratio characteristic curve in this embodiment, the installation position of the eccentric bolt is adjustable. When the installation position of the eccentric bolt is rotated by an angle, the angle of the eccentric cylindrical section on it changes accordingly, which in turn changes the angle of the inclined guide block leaning against the eccentric cylindrical section, which in turn changes the angle of the guide inclined surface that cooperates with the cylindrical roller during the speed change process, so that the transmission ratio characteristic curve of the transmission changes. Therefore, when the motorcycle using the transmission is mainly driven in the mountains, the transmission ratio characteristic curve can be adjusted to be gentler by changing the position of the eccentric bolt to ensure the output torque of the transmission and meet its climbing performance; and when the motorcycle using the transmission is mainly driven on flat terrain, the transmission ratio characteristic curve can be adjusted to be steeper by changing the position of the eccentric bolt so that the vehicle can quickly accelerate from low speed to high speed to ensure the acceleration performance of the vehicle.

[0027] As an improvement to the above embodiment, the eccentric bolt is also provided with an anti-loosening spring 17, one end of which is pressed against the nut, and the other end of which is pressed against the moving wheel. During the driving of the vehicle, vibration will be generated, and the anti-loosening spring can prevent the nut from loosening and falling off under the vibration.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A continuously variable transmission with an adjustable transmission ratio characteristic curve, comprising a shaft sleeve, a spring seat, a moving wheel, a sliding cover and a spring, wherein the spring seat is fixed to the middle of the shaft sleeve, the moving wheel and the sliding cover are located on both sides of the spring seat, the moving wheel and the sliding cover are sleeved on the shaft sleeve in a manner that they can move in the axial direction, the moving wheel and the sliding cover are fixedly connected, one end of the spring is pressed against the spring seat, and the other end of the spring is pressed against the sliding cover, and the characteristics are: Also included are a swing arm, a cylindrical roller, a ramp guide block and an eccentric bolt assembly; One end of the swing arm is hinged on the spring seat, and the other end of the swing arm is connected to the cylindrical roller; The inclined plane guide block is hinged on the moving wheel; The eccentric bolt assembly comprises an eccentric bolt and a nut. The eccentric bolt has an eccentric cylindrical section. The moving wheel is provided with a hexagonal hole matched with the hexagonal head of the eccentric bolt. The eccentric bolt is passed through the moving wheel, the head of the eccentric bolt is embedded in the hexagonal hole, and the other end of the eccentric bolt is connected to the nut. One side of the inclined surface guide block leans against the eccentric cylindrical section, and the other side of the inclined surface guide block is provided with a guiding inclined surface leaning against the cylindrical roller.

2. The continuously variable transmission with adjustable transmission ratio characteristic curve according to claim 1, characterized in that: The eccentric bolt is also sleeved with an anti-loosening spring, one end of the anti-loosening spring is pressed against the nut, and the other end of the anti-loosening spring is pressed against the moving wheel.

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