Straddle type vehicle

Abstract

The utility model relates to a straddle type vehicle which comprises a vehicle frame, a front wheel, a rear wheel, an engine, a transmission mechanism and a rear rocker arm, the front wheel and the rear wheel can respectively rotate along a front wheel axis and a rear wheel axis, the front wheel and the rear wheel are respectively arranged at the front position and the rear position of the vehicle frame, so that a wheel base is formed between the front wheel axis and the rear wheel axis, in addition, the engine is fixedly connected to the vehicle frame, and the transmission mechanism is fixedly connected to the rear rocker arm. The rear wheel is connected with the engine and can drive the rear wheel to rotate through the transmission mechanism, the rear rocker arm is connected between the engine and the rear wheel, the transmission mechanism and the rear rocker arm are connected to the engine and located on the axis of a power output shaft of the engine, and the rear rocker arm can swing relative to the engine with the power output shaft as the axis. When the motorcycle travels on a bumping road surface, the tension of the transmission belt of the transmission mechanism can be kept constant and is not large or small suddenly, the durability of the transmission mechanism is relatively improved, and the service life of the transmission mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to a straddle-type vehicle, in particular to a straddle-type vehicle, when passing through a bumpy road surface, enabling the tension of the transmission belt of the transmission mechanism to be maintained constant without fluctuating greatly or small, relatively improving the durability of the transmission mechanism and extending the service life of the transmission mechanism, and even improving the stability of the straddle-type vehicle when cornering at high speed. Background Art

[0002] A motorcycle is a two-wheeled and three-wheeled vehicle that can move via an engine, and the motorcycle can change the moving direction via a steering handle. Therefore, the motorcycle has the advantages of easy operation, convenient parking, and high mobility, making the motorcycle the most popular means of transportation currently.

[0003] Please refer to Figure 1 As shown, an existing fixed-lock motorcycle 50 commonly seen on the market currently. The existing fixed-lock motorcycle 50 has a frame 51 and an engine 52 fixedly connected to the frame 51. The engine 52 can drive a driving wheel 53 to rotate around an output axis L1, so that the rotating driving wheel 53 can drive a driven wheel 55 to rotate via a transmission belt 54. Furthermore, a rear wheel 56 located behind the engine 52 can rotate synchronously with the driven wheel 55. Among them, the rear wheel 56 is connected to a rear swing arm 57, and the rear swing arm 57 is pivotally connected to the engine 52, so that the rear swing arm 57 can swing relative to the engine 52 around a swing arm axis L2.

[0004] However, the driving wheel 53 and the rear swing arm 57 are connected to different positions of the engine 52, so that the output axis L1 is arranged at intervals from the swing arm axis L2. Furthermore, the output axis L1 is not coaxially arranged with the swing arm axis L2. When the existing fixed-lock motorcycle 50 passes through a bumpy road surface, the tension of the transmission belt 54 cannot be maintained constant but will fluctuate greatly or small, relatively shortening the service lives of the driving wheel 53, the transmission belt 54, and the driven wheel 55. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a straddle-type vehicle, which modifies the connection mode between the engine and the rear swing arm, so that when the straddle-type vehicle passes through a bumpy road surface, the tension of the transmission belt can be maintained constant without fluctuating greatly or small, relatively improving the durability of the driving and driven wheels and extending the service lives of the driving and driven wheels.

[0006] The secondary purpose of the utility model is to provide a straddle-type vehicle, which modifies the length of the rear swing arm without changing the wheelbase state between the front and rear wheels, so that the straddle-type vehicle can improve the stability when cornering at high speed.

[0007] To achieve the foregoing object, the present utility model provides a straddle-type vehicle, comprising: a frame, a wheel set, a power unit, and a rear swing arm;

[0008] The wheel set is provided with a front wheel disposed in front of the frame and a rear wheel disposed behind the frame. The front wheel can rotate about a front wheel axis, and the rear wheel can rotate about a rear wheel axis. A wheel wheelbase is formed between the front wheel axis and the rear wheel axis;

[0009] The power unit has an engine and a transmission mechanism. The engine is fixedly connected to the frame and cannot swing relative to the frame, and is provided with a rotatable power output shaft. The transmission mechanism is connected between the power output shaft and the rear wheel, so that the transmission mechanism can drive the rear wheel to rotate through the engine;

[0010] The rear swing arm has a left swing arm and a right swing arm assembled with each other to jointly form a swing arm rear end and a swing arm front end. The swing arm rear end is connected to the rear wheel, and the swing arm front end is pivotally connected to the engine;

[0011] Wherein, the positions where the transmission mechanism and the rear swing arm are both connected to the engine are located on the axis of the power output shaft, so that the rear swing arm can swing relative to the engine with the power output shaft as the axis. The rear swing arm is provided with a swing arm length to represent the distance between the power output shaft and the rear wheel axis. The swing arm length is more than 1 / 3 times of the wheel wheelbase.

[0012] In this embodiment, both the left swing arm and the right swing arm are pivotally connected to the power output shaft by a bearing. In addition, the left swing arm is sequentially provided with a left rear connecting portion, a left middle connecting portion, and a left front connecting portion, and the right swing arm is sequentially provided with a right rear connecting portion, a right middle connecting portion, and a right front connecting portion. The right rear connecting portion is arranged at an interval to the right of the left rear connecting portion to jointly form the swing arm rear end to be connected to the rear wheel, and the right middle connecting portion is connected to the left middle connecting portion. The right front connecting portion is arranged at an interval to the right of the left front connecting portion to jointly form the swing arm front end to be pivotally connected to the engine.

[0013] The feature of the present utility model is that the positions where the transmission mechanism and the rear swing arm are both connected to the engine are located on the axis of the power output shaft of the engine, so that the rear swing arm can swing relative to the engine with the power output shaft as the axis. Furthermore, when the straddle-type vehicle travels on a bumpy road surface, the tension of the transmission belt of the transmission mechanism can be maintained constant and will not be too large or too small, relatively improving the durability of the transmission mechanism and prolonging the service life of the transmission mechanism.

[0014] In addition, the length of the swing arm of the rear swing arm is defined as the distance between the power output shaft and the rear wheel axis, and the length of the swing arm of the rear swing arm is more than 1 / 3 times the wheelbase between the front and rear wheels. As a result, the straddle-type vehicle can improve the stability when cornering at high speed. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of an existing fixed-lock motorcycle;

[0016] Figure 2 It is a perspective view of a straddle-type vehicle;

[0017] Figure 3 It is an exploded perspective view of a straddle-type vehicle;

[0018] Figure 4 It is a left side view of a straddle-type vehicle;

[0019] Figure 5 It is a partial top view of a straddle-type vehicle.

[0020] Description of the Reference Numerals: 1 - straddle-type vehicle; 10 - frame; 11 - head pipe; 12 - side pipe; 13 - steering handle; 14 - front fork assembly; 20 - wheel set; 21 - front wheel; 22 - rear wheel; 30 - power unit; 31 - engine; 311 - power output shaft; 32 - transmission mechanism; 321 - driving wheel; 322 - driven wheel; 323 - transmission belt; 40 - rear swing arm; 41 - left swing arm; 411 - left front connecting portion; 412 - left rear connecting portion; 413 - left middle connecting portion; 42 - right swing arm; 421 - right front connecting portion; 422 - right rear connecting portion; 423 - right middle connecting portion; 43 - front end of the swing arm; 44 - rear end of the swing arm; 45 - bearing; D1 - wheelbase; D2 - length of the swing arm; S1 - front wheel axis; S2 - rear wheel axis; 50 - existing fixed-lock motorcycle; 51 - frame; 52 - engine; 53 - driving wheel; 54 - transmission belt; 55 - driven wheel; 56 - rear wheel; 57 - rear swing arm; L1 - output axis; L2 - swing arm axis. Detailed Embodiments

[0021] The following will further describe the present invention in conjunction with specific embodiments and the drawings. The advantages and features of the present invention will become clearer as the description proceeds.

[0022] In the present drawings, both sides of the X-axis refer to the left and right sides when the driver is sitting on the straddle-type vehicle 1, and the Y-axis refers to the front and rear sides when the driver is sitting on the straddle-type vehicle 1. As for both sides of the Z-axis, they refer to the upper and lower sides when the driver is sitting on the straddle-type vehicle 1. Therefore, in the description of this case, directional terms such as "front", "rear", "left", "right", "upper", and "lower" refer to the directions faced by the driver when sitting on the straddle-type vehicle 1.

[0023] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the present utility model provides a straddle-type vehicle 1, which mainly consists of a frame 10, a wheel set 20, a power unit 30 and a rear swing arm 40. As shown in the figure, a head tube 11 is provided at the front of the frame 10. And the frame 10 extends backward from the head tube 11 to form two side tubes 12, and the two side tubes 12 are respectively located on the left and right sides of the head tube 11. Among them, a steering handle 13 is installed on the frame 10 at the position of the head tube 11, and the steering handle 13 is connected to a front fork device 14 located below the head tube 11.

[0024] The wheel set 20 has a front wheel 21 and a rear wheel 22. The front wheel 21 is pivotally connected to the front fork device 14 of the frame 10, so that the front wheel 21 can rotate below the head tube 11 of the frame 10 with a front wheel axis S1 parallel to the X-axis. And the rear wheel 22 is located below the two side tubes 12 of the frame 10, and the rear wheel 22 can rotate behind the front wheel with a rear wheel axis S2 parallel to the X-axis. Among them, the rear wheels 22 are arranged at intervals behind the front wheel 21, so that a wheel wheelbase D1 is formed between the front wheel 21 and the rear wheel 22 to represent the distance between the front wheel axis S1 and the rear wheel axis S2.

[0025] The power unit 30 has an engine 31 and a transmission mechanism 32. The engine 31 is fixedly connected to the two side tubes 12 of the frame 10, so that the engine 31 cannot swing relative to the frame 10. And the engine 31 is provided with a power output shaft 311 parallel to the X-axis, and the engine 31 can drive the power output shaft 311 to rotate around the X-axis. In addition, the transmission mechanism 32 has three parts: a driving wheel 321, a driven wheel 322 and a transmission belt 323. The driving wheel 321 is connected to the power output shaft 311, so that the driving wheel 321 can rotate around the power output shaft 311. And the driven wheel 322 is connected to the rear wheel 22 of the wheel set 20, and the transmission belt 323 is simultaneously connected to the driving wheel 321 and the driven wheel 322, so that the rotating driving wheel 321 can drive the rear wheel 22 to rotate through the transmission belt 323.

[0026] The rear swing arm 40 is disposed between the rear wheel 22 of the wheel set 20 and the engine 31 of the power unit 30. The rear swing arm 40 is provided with a left swing arm 41 and a right swing arm 42. The two ends of the left swing arm 41 are respectively provided with a left front connecting portion 411 and a left rear connecting portion 412. A left middle connecting portion 413 is formed between the left front connecting portion 411 and the left rear connecting portion 412 of the left swing arm 41. In addition, the two ends of the right swing arm 42 are respectively provided with a right front connecting portion 421 and a right rear connecting portion 422. A right middle connecting portion 423 is formed between the right front connecting portion 421 and the right rear connecting portion 422 of the right swing arm 42. The left middle connecting portion 413 is connected to the right middle connecting portion 423, so that the left front connecting portion 411 is arranged at intervals on the left side of the right front connecting portion 421, and the left and right front connecting portions 411 and 421 together form a front end 43 of the swing arm. Furthermore, the left rear connecting portion 412 is arranged at intervals on the left side of the right rear connecting portion 422, and the left and right rear connecting portions 412 and 422 together form a rear end 44 of the swing arm. As shown in the figure, the front end 43 of the swing arm formed by the left and right front connecting portions 411 and 421 is connected to the power output shaft 311 via a bearing 45, so that the rear swing arm 40 can swing relative to the engine 31 with the power output shaft 311 as the axis. The rear end 44 of the swing arm formed by the left and right rear connecting portions 412 and 422 is connected to the rear wheel 22. In this embodiment, the positions where the driving wheel 321 of the transmission mechanism 32 and the front end 43 of the rear swing arm 40 are assembled on the engine 31 are both located on the axis of the power output shaft 311, so that the rear swing arm 40 can swing relative to the engine 31 with the power output shaft 311 as the axis. Thus, when the straddle-type vehicle 1 travels on a bumpy road surface, the tension of the transmission belt 323 can be maintained constant without being too large or too small, relatively improving the durability of the driving wheel 321 and the driven wheel 322 and extending the service life of the driving wheel 321 and the driven wheel 322.

[0027] Please refer to Figure 4 As shown, the rear swing arm 40 is provided with a swing arm length D2 to represent the distance between the power output shaft 311 and the rear wheel axis S2. The swing arm length D2 is 1 / 3 times of the wheelbase D1 of the vehicle, and thereby, the straddle-type vehicle 1 can improve the stability of high-speed cornering.

[0028] The above description is illustrative of the present invention and not restrictive. Those of ordinary skill in the art can understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all of them will fall within the protection scope of the present invention.

Claims

1. A straddle-type vehicle, characterized in that, Comprising: A vehicle frame; A wheel set, having a front wheel disposed in front of the vehicle frame and a rear wheel disposed behind the vehicle frame. The front wheel can rotate about a front wheel axis, and the rear wheel can rotate about a rear wheel axis. A wheel wheelbase is formed between the front wheel axis and the rear wheel axis; A power unit, having an engine and a transmission mechanism. The engine is fixedly connected to the vehicle frame and cannot swing relative to the vehicle frame, and is provided with a rotatable power output shaft. The transmission mechanism is connected between the power output shaft and the rear wheel, so that the transmission mechanism can drive the rear wheel to rotate through the engine; and A rear swing arm, having a left swing arm and a right swing arm assembled together to jointly form a rear end of the swing arm and a front end of the swing arm. The rear end of the swing arm is connected to the rear wheel, and the front end of the swing arm is pivotally connected to the engine; Wherein, the positions where the transmission mechanism and the rear swing arm are both connected to the engine are located on the axis of the power output shaft, so that the rear swing arm can swing relative to the engine with the power output shaft as the axis. The rear swing arm is provided with a swing arm length to represent the distance between the power output shaft and the rear wheel axis. The swing arm length is more than 1 / 3 times of the wheel wheelbase.

2. The straddle-type vehicle according to claim 1, wherein: Both the left swing arm and the right swing arm are pivotally connected to the power output shaft by a bearing.

3. The straddle-type vehicle according to claim 1, characterized in that: The left swing arm is sequentially provided with a left rear connecting portion, a left middle connecting portion and a left front connecting portion, and the right swing arm is sequentially provided with a right rear connecting portion, a right middle connecting portion and a right front connecting portion. The right rear connecting portion is arranged at the right of the left rear connecting portion at intervals to jointly form the rear end of the swing arm to be connected to the rear wheel, and the right middle connecting portion is connected to the left middle connecting portion. The right front connecting portion is arranged at the right of the left front connecting portion at intervals to jointly form the front end of the swing arm to be pivotally connected to the engine.

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