JP2024019966A - rear two wheel vehicle - Google Patents

Abstract

[Problem] To prevent a rear two-wheeled vehicle from overturning when stopped and ensure stable running. [Solution] In a rear two-wheeled vehicle in which a front wheel F is steered left and right by rotation of a handle post 3 rotatably supported on a frame 1, and a rear wheel R is provided with two wheels W, W parallel to each other in the width direction of the vehicle body. , rear wheel support parts 7 and 9 connected to the rear of the frame 1; a link mechanism 10 connected to the rear wheel support parts 7 and 9; and a link mechanism 10 connected to the link mechanism 10 of the rear wheel R. Bearings 63, 63 rotatably support the axle B connecting the two wheels W, W, and the rotation of the handle post 3 is transmitted to the link mechanism 10 to connect the frame 1 and the The rear two-wheeled vehicle is equipped with a transmission mechanism 70 that swings the rear wheel support parts 7 and 9 to the left and right. [Selection diagram] Figure 1

Description

The present invention relates to a rear two-wheeled vehicle having two rear wheels arranged in parallel in the width direction of the vehicle body.

There is a two-wheeled rear vehicle that has two rear wheels arranged in parallel in the width direction of the vehicle body. For example, the rear two-wheeled vehicles of Patent Documents 1 and 2 include a frame extending in the longitudinal direction of the vehicle body, a cylindrical center post provided at the front end of the frame, and a front wheel steering mechanism attached to the center post. There is. The steering mechanism includes a front fork member that rotatably supports the front wheels, a handle post that is inserted through the center post, a steering handle, and the like. Further, a rear wheel holding portion that supports the axle between the left and right rear wheels is connected to the rear end of the frame. When the driver turns the crank pedal with force, the rear wheels are driven via a chain.

Further, the rear two-wheel vehicle of the electrically assisted bicycle is provided with a pedal force assisting device near the center of the frame to assist the driver's pedal force. The crank pedal, into which the driver's pedal effort is input, is connected to a pedal assist device, and the driving force is transmitted via a shaft and chain to the axle that connects the left and right tires of the rear wheels. Furthermore, in recent years, two-wheel rear vehicles have been put into practical use even in motorcycles equipped with a prime mover such as an engine.

Japanese Patent Application Publication No. 10-264875 Japanese Patent Application Publication No. 10-264872

In conventional rear two-wheeled vehicles, a swing mechanism is provided between a rear wheel holding section that supports an axle between left and right rear wheels and a frame of a vehicle body. Vehicles with two rear wheels equipped with a swing function can tilt the vehicle body when passing through intersections or curves, allowing smooth driving while keeping the left and right rear wheels in contact with the ground. However, in a rear two-wheeled vehicle equipped with a swing function, if the driver loses his/her balance while the vehicle is stopped with one foot on the ground, the vehicle body may tilt significantly and fall. Furthermore, if the vehicle body is tilted insufficiently or excessively, stable running may not be ensured.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the vehicle from overturning when the vehicle is stopped and to ensure stable running in a two-wheel vehicle having two rear wheels arranged in parallel in the width direction of the vehicle body.

In order to solve the above-mentioned problems, the present invention provides two rear wheels in which the front wheels are steered left and right by the rotation of a handle post rotatably supported by a frame, and the rear wheels are provided with two wheels arranged in parallel in the width direction of the vehicle body. In the vehicle, a rear wheel support part connected to the rear of the frame, a link mechanism connected to the rear wheel support part, and an axle connected to the link mechanism and connecting the two wheels of the rear wheel are rotatable. and a transmission mechanism that transmits the rotation of the handle post to the link mechanism to swing the frame and the rear wheel support part left and right with respect to the two wheels. .

Here, the link mechanism includes a lower link bar to which the bearing is connected, and an upper link bar that is provided above the lower link bar and is swingable with respect to the rear wheel support part, and The mechanism includes a terminal rotating member on the lower link bar that rotates as the handle post rotates, and a terminal swinging member that supports the terminal rotating member is provided with the upper link bar or a counter fixed to the upper link bar. It is possible to employ a configuration in which the rear wheel support part is inclined in the vehicle width direction with respect to the lower link bar by engaging with the force member and rotating the terminal rotation member.

Further, the link mechanism includes a lower link bar to which the bearing is connected, and the transmission mechanism includes a terminal rotating member on the lower link bar that rotates with rotation of the handle post, and the transmitting mechanism includes a terminal rotating member on the lower link bar that rotates with rotation of the handle post. The supporting end swinging member engages with the lower link bar or a reaction force member fixed to the lower link bar, and the rotation of the end rotating member causes the rear wheel support portion to move against the lower link bar. A configuration in which the vehicle body is tilted in the width direction can be adopted.

In each of these aspects, a configuration may be adopted that includes a switching mechanism that turns on/off transmission of the rotation of the handle post to the transmission mechanism.

In each of these aspects, the transmission mechanism may include a first rotating member that rotates together with the handle post, and an endless member that transmits the rotation of the first rotating member to the terminal rotating member.

In each of these aspects, the transmission mechanism may include a first rotating member that rotates together with the handle post, and a rotating shaft that transmits rotation of the first rotating member to the terminal rotating member.

The present invention can prevent overturning when the vehicle is stopped and ensure stable running in a rear two-wheeled vehicle having two rear wheels arranged in parallel in the width direction of the vehicle body.

Overall diagram showing the first embodiment of this invention Right side view of Figure 1 (straight ahead state) Right side view of Figure 1 (left steering state) Top view of Figure 2A Enlarged view of main parts of Figure 1 Overall diagram showing the second embodiment of this invention Right side view of Figure 5 (straight ahead state) Right side view of Figure 5 (left steering state) Top view of Figure 6A Left side view of Figure 7 Overall diagram showing the third embodiment of this invention

A rear two-wheeled vehicle C according to an embodiment of the present invention will be described based on the drawings. 1 to 4 show a first embodiment, FIGS. 5 to 8 show a second embodiment, and FIG. 9 shows a third embodiment. In the first and second embodiments, the present invention will be explained using a rear two-wheel bicycle as an example, which has one wheel W on the front wheel F and two wheels W, W arranged in parallel in the width direction of the vehicle body on the rear wheels RL/RR. However, in the third embodiment, this invention will be described using a rear two-wheel motorcycle (rear two-wheel motor bicycle or rear two-wheel motorcycle) having two wheels W, W arranged in parallel in the width direction of the vehicle body on the rear wheels RL/RR as an example. is explained.

(First embodiment)
As shown in FIG. 1, the basic configuration of the rear two-wheeled vehicle C of the first embodiment includes a frame 1 extending in the longitudinal direction of the vehicle body, and a cylindrical center post ( head tube) 4 and a steering mechanism for the front wheels attached to the center post 4. The steering mechanism includes a front fork member 5 that rotatably supports one tire wheel W constituting the front wheel F around an axle A, and a center post 4 that is inserted through the center post 4 to support the front fork member 5. The steering handle 2 is connected to the handle post 3 and the upper end of the handle post 3 by a clamp member.

A saddle 8a is attached to the upper part of a seat tube 8 rising from the frame 1 so as to be movable up and down. A driver sitting on the saddle 8a can grip the grip portions 2a at both ends of the steering handle 2 and operate the steering wheel 2. Furthermore, brake levers are provided at both ends of the steering handle 2 to adjust the braking force applied to the front wheels F and rear wheels RR/RL. When the driver turns the steering wheel 2 left and right, the handle post 3 rotates around the axis and the front wheels F are steered left and right. Note that the front fork member 5, like a general bicycle with two front and rear wheels, has a single shaft on the upper side, and the side on the tire wheel W is divided into two parts, and the tip thereof connects both ends of the axle A of the tire wheel W. It has a supporting structure.

Furthermore, a seat stay 7 and a chain stay 9 are integrally connected to the rear of the frame 1. The seat stay 7 includes a first member 7a rising upward from the rear end of the chainstay 9, a second member 7b protruding rearward from the middle of the first member 7a facing in the vertical direction, and an upper end of the seat tube 8. It has a third member 7c that connects the upper end of the first member 7a. The seat stay 7 also has a fourth member 7d that projects rearward from the lower end of the first member 7a (the rear end of the chain stay 9). Hereinafter, the seat stay 7 and the chain stay 9 will be collectively referred to as rear wheel support parts 7 and 9. In addition, the code|symbol 6 in a figure is a loading platform.

A link mechanism 10 is connected to the rear wheel support parts 7 and 9, and bearings 63 and 63 that rotatably support an axle B connecting two wheels W and W of the rear wheel R are connected to the link mechanism 10. There is. Tire wheels W of rear wheels RR/RL are attached to both ends of the axle B. When the crank pedal 55 is rotated by the driver's pedal effort, the rear wheels RR/RL are driven via the front sprocket 51, the rear sprocket 52, and the chain 53. The front sprocket 51 rotates together with the rotating shaft 54 of the crank pedal 55, and the rear sprocket 52 rotates together with the axle B between the rear wheels RR/RL. Reference numeral 62 in FIGS. 2A, 2B, and 3 is a brake disc (brake pads, brake calipers, etc. are not shown). Brake discs 62 are provided on both wheels W, W, respectively.

The link mechanism 10 includes a lower link bar 12 to which bearings 63, 63 are connected, and an upper link bar 11 provided above the lower link bar 12.

The upper link bar 11 is a longitudinal member arranged toward the width direction of the vehicle body. The upper link bar 11 is swingable about the swing shaft 15 with respect to the rear wheel supports 7 and 9 via the swing shaft 15. The swing shaft 15 is fixed to the second member 7b of the rear wheel support section 7, and passes through the longitudinal center of the upper link bar 11 facing in the vehicle width direction. Since the upper link bar 11 can swing around the swing shaft 15, when the right end of the upper link bar 11 in the vehicle width direction rises, the left end of the upper link bar 11 in the vehicle width direction lowers, and the right end of the upper link bar 11 in the vehicle width direction moves downward. If it descends, the left end in the width direction of the vehicle will rise. Here, a bearing may be arranged between the fixed swinging shaft 15 and the upper link bar 11 in the frame (second member 7b), or the swinging shaft 15 and the upper link bar 11 may be integrated into the frame. A bearing may be arranged between (the second member 7b) and the swing shaft 15.

The lower link bar 12 is a longitudinal member arranged toward the width direction of the vehicle body. Both longitudinal ends of the lower link bar 12 are fixed to bearings 63, 63 that support the axle B via bolts 63a. Reference numeral 63 in the figure indicates a bearing unit having a bearing structure inside the housing, and bolts 63a connect the housing of the bearing unit and the bracket portions 12a provided at both ends of the lower link bar 12. ing. Further, the longitudinal center of the lower link bar 12 is swingable with respect to the rear wheel support portion 7 via a support shaft 18 . The support structure of the support shaft 18 is similar to that of the swing shaft 15.

A transmission mechanism 70 that transmits rotation of the handle post 3 to the link mechanism 10 is connected to the link mechanism 10 .

In this embodiment, as the transmission mechanism 70, as shown in FIGS. 3 and 4, the lower link bar 12 is provided with an end rotating member 74 that rotates as the handle post 3 rotates. The terminal rotating member 74 is a circular pulley, and is supported by the lower link bar 12 via a bearing so as to be rotatable about the axis. Further, the transmission mechanism 70 includes a first rotating member 71 that rotates together with the handle post 3. In the embodiment, the first rotating member 71 is a circular pulley and is integrally attached to the lower end of the handle post 3. Note that the first rotating member 71 may be attached to the axial middle or upper end of the handle post 3. Further, the first rotating member 71 only needs to transmit rotation around the axis of the handle post 3, and its installation position is not limited.

The transmission mechanism 70 includes an endless member 72 that transmits the rotation of the first rotation member 71 as rotation of the terminal rotation member 74. In this embodiment, the endless member 72 is a belt wound around a pulley that constitutes the first rotating member 71 and the terminal rotating member 74. The belt is an annular member made of a flexible material such as rubber. Further, a guide member 73 for guiding the movement of the endless member 72 is provided between the first rotating member 71 and the terminal rotating member 74. The guide member 73 is installed at a necessary location so as to smoothly transmit the movement of the endless member 72 from the first rotating member 71 to the terminal rotating member 74 and to change its direction at an appropriate position. For convenience, reference numerals 72a and 72b in the figure refer to a portion of the annular endless member 72 on the left side of the vehicle body as 72a, and a portion on the right side of the vehicle body as 72b.

In this embodiment, the guide members 73 include a first guide member 73a provided near the upper end of the down tube of the frame 1, and a second guide member 73b provided near the lower end of the down tube, as shown in FIG. The third guide member 73c is provided near the rear end of the chainstay 9, and the fourth guide member 73d is provided on the first member 7a of the rear wheel support portion 7 above the third guide member 73c. The first guide member 73a, the second guide member 73b, the third guide member 73c, and the fourth guide member 73d are rotors around which belts are wound, respectively, but if they guide the movement of the endless member 72, , may be other than the rotor.

Further, when the endless member 72 is employed as the transmission mechanism 70, the endless member 72 is not limited to a belt as in the embodiment, and other members such as a chain may be employed. When a chain is used, a sprocket can be used for the rotating members such as the first rotating member 71 and the terminal rotating member 74, and the guide member 73 in the middle.

The terminal rotating member 74 is supported by the terminal swinging member 17. The end swinging member 17 is fixed so as to rotate together with the end rotation member 74, and its tip protrudes outward beyond the outer edge of the end rotation member 74. An engaging portion 16 is provided at the tip of the terminal swing member 17 . Further, a reaction member 13 is provided on the upper link bar 11 so as to project downward. The upper link bar 11 and the reaction force member 13 are fixed so as to move together with each other. The engaging portion 16 engages with an engaged portion 13a formed on the reaction force member 13. In this embodiment, the engaging portion 16 is a cylindrical protrusion, and the engaged portion 13a is a recess into which the cylindrical protrusion enters. However, various changes can be made to the aspects of the engaging portion 16 and the engaged portion 13a. For example, the embodiment may be reversed, and the engaged portion 13a may be a cylindrical projection, and the engaging portion 16 may be a recess into which the cylindrical projection enters. Further, the installation of the reaction member 13 may be omitted and the engaged portion 13a may be provided directly on the upper link bar 11.

Further, the link mechanism 10 includes a spring mechanism 30 as a suspension that cushions the impact from the wheels W, W to the frame 1. The spring mechanism 30 includes a pair of left and right coil springs 31, 31. The receiving portions 32 attached above and below each of the coil springs 31, 31 are pin-jointed to both ends of the upper link bar 11 and both ends of the lower link bar 12, respectively. Therefore, the left and right spring mechanisms 30 are swingable about the axis of the pin with respect to the upper link bar 11 and the lower link bar 12. As a result, the left and right spring mechanisms 30, the upper link bar 11, and the lower link bar 12 constitute a four-bar crank mechanism. The spring mechanism 30 also exhibits a restoring function of returning the frame 1 and the rear wheel support parts 7, 9 from the tilted state to the neutral state (non-tilted state). In addition, if such a suspension function and restoring function are not required, the left and right spring mechanisms 30 can be omitted and instead, a normal link bar that does not have the same elastic function as the upper link bar 11 and the lower link bar 12 can be used. The left ends of the upper link bar 11 and the lower link bar 12 may be joined together, and the right ends of the upper link bar 11 and the lower link bar 12 may be joined with pins.

Further, the axes of the coil springs 31, 31 constituting the left and right spring mechanisms 30 may be parallel to each other, or may be slightly cambered so as to gradually approach each other upward. Further, a locking mechanism that stops the swing function by locking the relative movement of the upper link bar 11 and the lower link bar 12 in the vehicle width direction may be provided somewhere in the link mechanism 10.

These devices attached to the rear wheel supports 7 and 9, that is, the link mechanism 10, the axle B, and the rear wheels RR/RL constitute a rear wheel unit U by the spring mechanism 30 and the like.

When the handle post 3 rotates around the axis due to the driver's operation of the steering handle 2, the terminal rotation member 74 rotates through the transmission mechanism 70. Thereby, the frame 1 and the rear wheel supports 7, 9 can be swung left and right with respect to the two wheels W, W of the rear wheel R. That is, the frame 1 and the rear wheel supports 7, 9 can be tilted in the left-right direction with respect to the wheels W, W of the rear wheels RR/RL that are in contact with the ground, and the axle B connecting the wheels W, W.

FIG. 2A shows a neutral state in which the rear two-wheeled vehicle C is traveling straight, and FIG. 2B shows a left-turning state. For example, when the driver operates the steering wheel 2 to the right (attempts to turn right), the lower link bar 12 is pushed to the left as the handle post 3 rotates to the right around the axis. Conversely, the link mechanism 10 is deformed in a direction in which the upper link bar 11 is pushed out to the right. As a result, the frame 1 and the rear wheel supports 7 and 9 are tilted to the right, promoting movement of the driver's center of gravity and smoothing the right turn of the vehicle. Further, for example, when the driver operates the steering wheel 2 to the left (attempts to turn left), the lower link bar 12 is pushed out to the right as the handle post 3 rotates to the left around the axis. Conversely, the link mechanism 10 is deformed in a direction in which the upper link bar 11 is pushed out to the left (the state shown in FIG. 2B). As a result, the frame 1 and the rear wheel supports 7 and 9 are tilted to the left, promoting movement of the driver's center of gravity and smoothing the left turning of the vehicle. Since the vehicle body tilts as the driver operates the steering wheel, it is possible to prevent the vehicle from falling due to the vehicle's inclination when the vehicle is stopped, and to ensure stable driving by appropriately tilting the vehicle body.

In this embodiment, the upper link bar 11 is made up of one continuous member over its entire length, but this is divided into left and right parts, and one side in the width direction of the vehicle body (the right side as seen from the driver) The vehicle may be divided into a first upper link bar disposed on the other side (left side as viewed from the driver) and a second upper link bar disposed on the other side (left side as viewed from the driver). Further, in the embodiment, the lower link bar 12 is also made of one continuous member over the entire length, but it is divided into left and right parts, and is divided into a first lower link bar arranged on one side in the width direction of the vehicle body. , and a second lower link bar disposed on the other side. This also applies to each embodiment described below.

Further, this embodiment includes a switching mechanism 80 that turns on/off transmission of the rotation of the handle post 3 to the transmission mechanism 70. The switching mechanism 80 can be selectively installed depending on the specifications of the vehicle. This also applies to other embodiments described below.

As shown in FIG. 1, the switching mechanism 80 is provided at a position where the state of rotation transmission between the first rotating member 71 and the handle post 3 can be switched. The switching mechanism 80 has a state in which the rotation of the handle post 3 around the axis is transmitted to the first rotating member 71 (engaged state) and a state in which the rotation around the axis of the handle post 3 is not transmitted to the first rotating member 71 (idling state). You can switch to .

As the switching mechanism 80, for example, a configuration can be adopted in which a radial groove is formed from the outer edge of the first rotating member 71 toward the center, and an engagement pin that can move forward and backward is inserted into the radial groove. The handle post 3 is provided with an engagement recess into which the tip of the engagement pin enters at one location in the circumferential direction or at multiple locations along the circumferential direction. The engagement pin is biased by the elastic force of a spring or the like in a direction in which the tip thereof enters the engagement recess of the handle post 3. Further, a wire is connected to the engagement pin, and the wire is guided to an operating section provided near the grip section 2a of the steering handle 2.

When the driver operates the operating section and pulls the wire, the engagement pin is retracted against the biasing force of a spring or the like. As a result, the first rotating member 71 and the handle post 3 are separated, resulting in an idling state. The wire can be locked in place. Further, when the driver operates the operating section to release the tension on the wire, the engagement pin projects toward the handle post 3 side by the biasing force and enters the engagement recess. As a result, the first rotating member 71 and the handle post 3 are brought into an engaged state in which they rotate together. The switching mechanism 80 is not limited to this example, and various embodiments such as various clutch mechanisms provided between the first rotating member 71 and the handle post 3 can be adopted.

A second embodiment of this invention will be described based on FIGS. 5 to 8. Since the basic configuration of the rear two-wheeled vehicle C is the same as that of the first embodiment, the link mechanism 10 and the like, which are different from the first embodiment, will be mainly explained below.

The link mechanism 10 of the second embodiment includes a lower link bar 12 to which bearings 63, 63 are connected, and the installation of an upper link bar is omitted. The lower link bar 12 is a longitudinal member arranged in the width direction of the vehicle body, as in the first embodiment. Both longitudinal ends of the lower link bar 12 are fixed to bearings 63, 63 that support the axle B via bolts 63a.

As shown in FIGS. 7 and 8, the transmission mechanism 70 allows a terminal rotation member 74, which rotates with rotation of the handle post 3, to be freely rotatable with respect to the first member 7a of the rear wheel support portion 7. Further, the terminal rotating member 74 is supported by the terminal swinging member 17. The end swinging member 17 is fixed so as to rotate together with the end rotation member 74, and its tip protrudes outward beyond the outer edge of the end rotation member 74. An engaging portion 16 is provided at the tip of the terminal swing member 17 . Further, a reaction member 13 is provided on the lower link bar 12 so as to protrude upward. The lower link bar 12 and the reaction force member 13 are fixed so as to move together with each other. The engaging portion 16 engages with an engaged portion 13a formed on the reaction force member 13. Similar to the above embodiment, the engaging portion 16 is a cylindrical projection, and the engaged portion 13a is a recess into which the cylindrical projection enters, but the engaging portion 16 and the engaged portion 13a may have various shapes. For example, the embodiment may be reversed, and the engaged portion 13a may be a cylindrical projection, and the engaging portion 16 may be a recess into which the cylindrical projection enters. Furthermore, the installation of the reaction member 13 may be omitted and the engaged portion 13a may be provided directly on the lower link bar 12.

FIG. 6A shows a neutral state in which the rear two-wheeled vehicle C travels straight, and FIG. 6B shows a left-turning state. For example, when the driver operates the steering wheel 2 to the right (attempts to turn right), the lower link bar 12 is pushed to the left as the handle post 3 rotates to the right around the axis. On the contrary, the frame 1 and the rear wheel support parts 7 and 9 are inclined to the right. Further, for example, when the driver operates the steering wheel 2 to the left (attempts to turn left), the lower link bar 12 is pushed out to the right as the handle post 3 rotates to the left around the axis. , the frame 1 and the rear wheel supports 7 and 9 are tilted to the left (the state shown in FIG. 6B). This facilitates the movement of the driver's center of gravity, smoothes the turning of the vehicle, and prevents the vehicle from falling due to unintentional tilting of the vehicle body when the vehicle is stopped.

A third embodiment of this invention will be described based on FIG. 9. The rear two-wheeled vehicle C of the third embodiment is a rear two-wheeled motorcycle (motorized bicycle or motorcycle) equipped with a prime mover such as an engine. The prime mover may be an engine or a motor.

The configuration of the link mechanism 10 is basically the same as that in the first embodiment. However, the rotation transmission route by the transmission mechanism 70 is a route from the lower side of the link mechanism 10 to the terminal rotating member 74, contrary to the first and second embodiments. In FIG. 9, only main members are shown, and members common to the first embodiment are not shown.

The upper link bar 11 is swingable around the swing shaft 15 via a swing shaft 15 with respect to the rear wheel support portion 7 rising from the rear end of the frame 1 toward the saddle 8a. The swing shaft 15 is fixed to the rear wheel support section 7 and penetrates through the center of the upper link bar 11 in the longitudinal direction. The upper link bar 11 is swingable around the swing shaft 15 . Both longitudinal ends of the lower link bar 12 are fixed via bolts 63a to bearings 63, 63 that support the axle B (not shown in FIG. 9), similarly to the first embodiment. Further, although the spring mechanism 30 is not shown, the spring mechanism 30 can be installed arbitrarily.

The transmission mechanism 70 includes a terminal rotating member 74 on the lower link bar 12 that rotates as the handle post 3 rotates. The terminal rotating member 74 is a circular pulley, and is supported by the lower link bar 12 via a bearing so as to be rotatable about the axis. Further, the transmission mechanism 70 includes a first rotating member 71 that rotates together with the handle post 3. In the embodiment, the first rotating member 71 is a circular head gear, and is integrally attached to the lower end of the handle post 3. The installation position of the first rotating member 71 made of a cap gear may be in the axial middle or the upper end of the handle post 3, and the installation position is not limited.

The transmission mechanism 70 also includes a second rotating member 75a made of a hat gear that meshes with a first rotating member 71 made of a hat gear, a first rotating shaft 76a connected to the second rotating member 75a, and rotation of the first rotating shaft 76a. A second rotating shaft 76b is connected to the rear end of the first rotating shaft 76a so that the rotational speed is transmitted, and a third rotating member 75c is attached to the rear end of the second rotating shaft 76b. The axial direction of the first rotary shaft 76a and the axial direction of the second rotary shaft 76b intersect, and the rotation is transmitted at the intersecting connection point 75b by meshing between the cap gears or by a universal joint, etc. It looks like this. Further, the third rotating member 75c is a pulley. An endless member 76c is wound between the third rotating member 75c and the terminal rotating member 74. Although the endless member 76c is a belt, it may be used as a chain and the third rotating member 75c and the end rotating member 74 may be sprockets.

As in the first embodiment, the terminal rotating member 74 is supported by the terminal swinging member 17. The end swinging member 17 is fixed so as to rotate together with the end rotation member 74, and its tip protrudes outward beyond the outer edge of the end rotation member 74. An engaging portion 16 is provided at the tip of the terminal swing member 17 . Further, a reaction member 13 is provided on the upper link bar 11 so as to project downward. The upper link bar 11 and the reaction force member 13 are fixed so as to move together with each other. The engaging portion 16 engages with an engaged portion 13a formed on the reaction force member 13. Similar to the embodiment described above, the aspects of the engaging portion 16 and the engaged portion 13a can be changed in various ways.

For example, when the driver operates the steering wheel 2 to the right (attempts to turn right), the lower link bar 12 is pushed to the left as the handle post 3 rotates to the right around the axis. Conversely, the link mechanism 10 is deformed in a direction in which the upper link bar 11 is pushed out to the right. Thereby, the frame 1 and the rear wheel support parts 7, 9 are tilted to the right, promoting movement of the driver's center of gravity, and making it possible to smoothly turn the vehicle to the right. Further, for example, when the driver operates the steering wheel 2 to the left (attempts to turn left), the lower link bar 12 is pushed out to the right as the handle post 3 rotates to the left around the axis. , on the contrary, the link mechanism 10 is deformed in the direction in which the upper link bar 11 is pushed out to the left (similar to FIG. 2B of the first embodiment). As a result, the frame 1 and the rear wheel support parts 7, 9 are tilted to the left, promoting movement of the driver's center of gravity, and making it possible to smoothly turn the vehicle to the left.

In the above embodiments, the content of the present invention has been explained using a rear two-wheeled bicycle and a rear two-wheeled motorcycle as an example. This invention can also be applied to electrically assisted bicycles.

1 Frame 2 Steering handle 3 Handle post 4 Center post 7, 9 Rear wheel support part 10 Link mechanism (swing mechanism)
11 Upper link bar 12 Lower link bar 13 Reaction force members 15, 16 Swing shaft 17 End swing member 30 Spring mechanism 63 Bearing 70 Transmission mechanism 71 First rotating member 72, 76c Endless member 74 End rotating member 76a, 76b Rotation Shaft 80 switching mechanism

Claims (6)

The front wheels (F) are steered left and right by the rotation of the handle post (3) rotatably supported by the frame (1), and two wheels (W, W) parallel to each other in the width direction of the vehicle are attached to the rear wheels (R). In rear two-wheeled vehicles equipped with
A rear wheel support section (7, 9) connected to the rear of the frame (1), a link mechanism (10) connected to the rear wheel support section (7, 9), and a link mechanism (10) connected to the rear wheel support section (7, 9). Bearings (63, 63) rotatably support an axle (B) that is connected and connects the two wheels (W, W) of the rear wheel (R), and the link mechanism controls the rotation of the handle post (3). (10) A transmission mechanism (70) that swings the frame (1) and the rear wheel support part (7, 9) left and right with respect to the two wheels (W, W) by transmitting the transmission to the two rear wheels (W, W). vehicle. The link mechanism (10) includes a lower link bar (12) to which the bearings (63, 63) are connected, and the rear wheel support portion (7, 9) provided above the lower link bar (12). and an upper link bar (11) that is swingable relative to the
The transmission mechanism (70) includes a terminal rotating member (74) on the lower link bar (12) that rotates with rotation of the handle post (3), and a terminal swinging member that supports the terminal rotating member (74). The movable member (17) engages with the upper link bar (11) or a reaction member (13) fixed to the upper link bar (11), and as the terminal rotating member (74) rotates, the lower The rear two-wheel vehicle according to claim 1, wherein the rear wheel support portions (7, 9) are inclined in the vehicle width direction with respect to the link bar (12). The link mechanism (10) includes a lower link bar (12) to which the bearings (63, 63) are connected,
The transmission mechanism (70) includes a terminal rotating member (74) on the lower link bar (12) that rotates with rotation of the handle post (3), and a terminal swinging member that supports the terminal rotating member (74). The movable member (17) engages with the lower link bar (12) or a reaction member (13) fixed to the lower link bar (12), and when the terminal rotating member (74) rotates, the lower link bar (12) rotates. The rear two-wheel vehicle according to claim 1, wherein the rear wheel support portions (7, 9) are inclined in the vehicle width direction with respect to the link bar (12). The rear two-wheeled vehicle according to any one of claims 1 to 3, further comprising a switching mechanism (80) that switches on/off transmission of the rotation of the handle post (3) to the transmission mechanism (70). The transmission mechanism (70) includes a first rotation member (71) that rotates together with the handle post (3), and an endless member that transmits the rotation of the first rotation member (71) to the terminal rotation member (74). (72, 76c) The rear two-wheeled vehicle according to any one of claims 1 to 3. The transmission mechanism (70) includes a first rotation member (71) that rotates together with the handle post (3), and a rotation shaft (74) that transmits the rotation of the first rotation member (71) to the terminal rotation member (74). 4. The rear two-wheeled vehicle according to claim 1, further comprising: 76a, 76b).

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