Saddle-type vehicle

Abstract

This provides a saddle-type vehicle that makes it easy to minimize changes in the angle of the rear arm. [Solution] The saddle-type vehicle 1 comprises a vehicle frame 2, a first axle A1, a rotating member 19, a pivot shaft P, a rear arm 9, a rear axle R, a rear wheel 11, and a coupling mechanism 18. The first axle A1 extends in the width direction Y and is supported by the vehicle frame 2. The rotating member 19 is supported by the first axle A1. The rotating member 19 rotates around the first axle A1 relative to the vehicle frame 2. The pivot shaft P extends in the width direction Y and is supported by the rotating member 19. The rear arm 9 is supported by the pivot shaft P. The rear arm 9 rotates around the pivot shaft P relative to the rotating member 19. The rear axle R extends in the width direction Y and is supported by the rear arm 9. The rear wheel 11 is supported by the rear axle R. The coupling mechanism 18 is connected to the vehicle frame 2, the rotating member 19, and the rear arm 9. The first distance E1 between axis a1 and axis p is 50 mm or more.

Description

Technical Field

[0001] The present invention relates to a saddle-ride type vehicle.

Background Art

[0002] The saddle-ride type vehicle of Patent Document 1 includes a vehicle body frame, a pivot shaft, a rear arm, a rear axle, and a rear wheel. The pivot shaft is supported by the vehicle body frame. The rear arm is supported by the pivot shaft. The rear arm rotates around the pivot shaft with respect to the vehicle body frame. The rear axle is supported by the rear arm. The rear wheel is supported by the rear axle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the rear arm rotates around the pivot shaft with respect to the vehicle body frame, the angle of the rear arm changes. When the angle of the rear arm changes, the state or behavior of the saddle-ride type vehicle changes. Therefore, when the change in the angle of the rear arm is small, it is easy for the driver to drive the saddle-ride type vehicle.

[0005] Here, the angle of the rear arm is, for example, the angle between the axis of the rear arm and a reference line in a side view of the saddle-ride type vehicle. The axis of the rear arm is a virtual line connecting the axis of the pivot shaft and the axis of the rear axle in a side view of the saddle-ride type vehicle. For example, the reference line may be defined by the vehicle body frame. Alternatively, the reference line may be defined by the road surface with which the rear wheel contacts.

[0006] The longer the rear arm is, the smaller the change in the angle of the rear arm. However, it may be difficult to increase the length of the rear arm.

[0007] This invention has been made in view of these circumstances, and aims to provide a saddle-type vehicle in which it is easy to reduce the change in the angle of the rear arm. [Means for solving the problem]

[0008] First, it was considered that the saddle-type vehicle should be equipped with a movable mechanism. This movable mechanism is for moving the pivot axis relative to the vehicle frame.

[0009] For example, the movable mechanism comprises a first shaft, a rotating member, and a connecting mechanism. The first shaft is supported by the vehicle frame. The rotating member is supported by the first shaft. The rotating member is configured to rotate around the first shaft relative to the vehicle frame. The pivot shaft is supported by the rotating member. The rear arm is supported by the pivot shaft. The rear arm is configured to rotate around the pivot shaft relative to the rotating member. The connecting mechanism connects the rear arm, the rotating member, and the vehicle frame.

[0010] When the rear axle moves relative to the vehicle frame, the rear arm rotates around the pivot axis relative to the rotating member, and the coupling mechanism rotates the rotating member around a first axis relative to the vehicle frame. When the rotating member rotates around the first axis relative to the vehicle frame, the pivot axis rotates around the first axis relative to the vehicle frame. In summary, when the rear axle moves relative to the vehicle frame, the pivot axis moves relative to the vehicle frame. Therefore, it is easy to minimize the change in the angle of the rear arm.

[0011] However, it was discovered that a new problem arises when a saddle-type vehicle is equipped with a movable mechanism. The rotation of the pivot axis around the first axis relative to the vehicle frame can be decomposed into a first movement of the pivot axis and a second movement of the pivot axis. The first movement of the pivot axis is the movement of the pivot axis relative to the vehicle frame in the vertical direction of the saddle-type vehicle. The second movement of the pivot axis is the movement of the pivot axis relative to the vehicle frame in the longitudinal direction of the saddle-type vehicle. The new problem is that when the pivot axis moves relative to the vehicle frame, the second movement of the pivot axis may become significantly larger.

[0012] For example, a saddle-type vehicle has a drive shaft and a drive mechanism. The drive shaft outputs power. The drive shaft is connected to, for example, an engine or a transmission. The drive mechanism transmits power from the drive shaft to the rear wheels. The drive mechanism includes, for example, a chain, a belt, or a drive shaft. The length of the drive mechanism is substantially equal to the distance between the rear axle and the drive shaft. When the pivot shaft moves relative to the vehicle frame, the distance between the drive shaft and the rear axle may change significantly. For example, when the amount of the second movement of the pivot shaft is significantly large, the distance between the rear axle and the drive shaft may change significantly. For this reason, it may be difficult for the drive mechanism to transmit power from the drive shaft to the rear wheels. For example, if the drive mechanism includes a chain, the movement of the pivot shaft relative to the vehicle frame may cause the chain to slacken. Therefore, the drive mechanism may need to have a complex structure.

[0013] Further investigations were conducted. This invention is based on these investigations. The present invention has the following configuration. In other words, the present invention is a saddle-type vehicle, The vehicle frame and Supported by the vehicle body frame, the first axle extends in the width direction of the saddle-type vehicle, A rotating member supported by the first axle and configured to rotate about the first axle relative to the vehicle frame, Supported by the rotating member, the pivot shaft extends in the width direction of the saddle-type vehicle, A rear arm is supported on the pivot axis and configured to rotate around the pivot axis relative to the rotating member, Supported by the rear arm, the rear axle extends in the width direction of the saddle-type vehicle, The rear wheel is supported by the aforementioned rear axle, The vehicle body frame, the rotating member, and the connecting mechanism connected to the rear arm, Equipped with, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the first axle and the axis of the pivot axis is defined as the first distance. The aforementioned first distance is 50 mm or more. It is a saddle-type vehicle.

[0014] A saddle-type vehicle comprises a body frame, a first axle, a rotating member, a pivot shaft, a rear arm, a rear axle, rear wheels, and a coupling mechanism. The first axle is supported by the body frame. The first axle extends in the width direction of the saddle-type vehicle. The rotating member is supported by the first axle. The rotating member is configured to rotate around the first axle relative to the body frame. The pivot shaft is supported by the rotating member. The pivot shaft extends in the width direction of the saddle-type vehicle. The rear arm is supported by the pivot shaft. The rear arm is configured to rotate around the pivot shaft relative to the rotating member. The rear axle is supported by the rear arm. The rear axle extends in the width direction of the saddle-type vehicle. The rear wheels are supported by the rear axle. The coupling mechanism connects the body frame, the rotating member, and the rear arm. Therefore, when the rear axle moves relative to the vehicle frame, the rear arm rotates around the pivot axis relative to the rotating member, and the coupling mechanism rotates the rotating member around the first axis relative to the vehicle frame. When the rotating member rotates around the first axis relative to the vehicle frame, the pivot axis rotates around the first axis relative to the vehicle frame. In summary, when the rear axle moves relative to the vehicle frame, the pivot axis moves relative to the vehicle frame. For this reason, it is easy to minimize the change in the angle of the rear arm.

[0015] In a side view of a straddle-type vehicle, the distance between the axis of the first shaft and the axis of the pivot shaft is defined as the first distance. The first distance is 50 mm or more. Thus, the first distance is relatively large. Therefore, even when the pivot shaft moves relative to the vehicle body frame, it is easy to reduce the amount of the second movement of the pivot shaft. Thus, it is easy to transmit power from the drive shaft to the rear wheels.

[0016] In summary, in a straddle-type vehicle, it is easy to reduce the change in the angle of the rear arm. Further, in a straddle-type vehicle, it is easy to reduce the amount of the second movement of the pivot shaft.

[0017] Note that the angle of the rear arm is, for example, the angle between the axis of the rear arm and the reference line in a side view of the straddle-type vehicle. The axis of the rear arm is a virtual line connecting the axis of the pivot shaft and the axis of the rear axle in a side view of the straddle-type vehicle. For example, the reference line may be defined by the vehicle body frame. Alternatively, the reference line may be defined by the road surface with which the rear wheel contacts.

[0018] The second movement of the pivot shaft is the movement of the pivot shaft relative to the vehicle body frame in the longitudinal direction of the straddle-type vehicle.

[0019] In the straddle-type vehicle described above, it is preferable that the first distance is 100 mm or more This makes it even easier to reduce the amount of the second movement of the pivot shaft.

[0020] In the straddle-type vehicle described above, in a side view of the straddle-type vehicle, it is preferable that the first shaft overlaps with the vehicle body frame This makes it easy for the vehicle body frame to support the first shaft.

[0021] In the straddle-type vehicle described above, in a side view of the straddle-type vehicle, it is preferable that the pivot shaft does not overlap with the vehicle body frame It is preferable. Therefore, it is easy to set the first distance to 50 mm or more.

[0022] In the aforementioned saddle-type vehicle, The first axle is positioned behind the pivot axis in a side view of the saddle-type vehicle. The first axle is positioned in front of the rear axle in a side view of the saddle-type vehicle. It is preferable. Therefore, the first axle is positioned appropriately with respect to the pivot axis. The first axle is positioned appropriately with respect to the rear axle. Therefore, the pivot axis is positioned appropriately with respect to the rear axle.

[0023] In the aforementioned saddle-type vehicle, The range within which the pivot axis can move is defined as the pivot range of motion. The pivot range of motion is limited to the area forward of the first axis. It is preferable. In other words, in the aforementioned saddle-type vehicle, The entire range of motion of the pivot is located in an area forward of the first axis. It is preferable. Therefore, it is easy to reduce the amount of the second movement of the pivot axis.

[0024] Here, the pivot range of motion is a portion of the circumference centered on the first axis. By rotating the pivot axis around the first axis, the pivot axis moves within the pivot range of motion.

[0025] In the aforementioned saddle-type vehicle, Equipped with a drive shaft that outputs power, The drive shaft is positioned in front of the pivot shaft. The pivot range of motion extends from a position above the imaginary line connecting the drive shaft and the first shaft to a position below the imaginary line in a side view of the saddle-type vehicle. It is preferable. Therefore, it is easy to increase the amount of the first movement of the pivot axis. Consequently, it is easy to reduce the change in the angle of the rear arm. The first movement of the pivot axis is the vertical movement of the pivot axis relative to the vehicle frame in the saddle-type vehicle.

[0026] In the aforementioned saddle-type vehicle, The pivot range of motion extends from a position higher than the first axle to a position lower than the first axle in a side view of the saddle-type vehicle. It is preferable. Therefore, it is easy to increase the amount of the first movement of the pivot axis.

[0027] In the aforementioned saddle-type vehicle, When the pivot axis is located on the virtual line in a side view of the saddle-type vehicle, the distance between the drive axis and the rear axle is shorter than the distance between the drive axis and the rear axle when the pivot axis is located above or below the virtual line in a side view of the saddle-type vehicle. It is preferable. Therefore, even when the pivot axis is located above or below the imaginary line in a side view of a saddle-type vehicle, it is easy to transmit power from the drive shaft to the rear wheels.

[0028] In the aforementioned saddle-type vehicle, When the pivot axis and the rear axle are located on the virtual line in a side view of the saddle-type vehicle, the distance between the drive axis and the rear axle is shorter than the distance between the drive axis and the rear axle when the pivot axis and the rear axle are located below the virtual line in a side view of the saddle-type vehicle. It is preferable. Therefore, even when the pivot axis and rear axle are located below the imaginary line in a side view of the saddle-type vehicle, it is easy to transmit power from the drive axle to the rear wheels.

[0029] In the aforementioned saddle-type vehicle, When the pivot axis and the rear axle are located on the imaginary line in a side view of the saddle-type vehicle, the distance between the drive axis and the rear axle is shorter than the distance between the drive axis and the rear axle when the pivot axis and the rear axle are located above the imaginary line in a side view of the saddle-type vehicle. It is preferable. Therefore, even when the pivot axis and rear axle are located above the imaginary line in a side view of the saddle-type vehicle, it is easy to transmit power from the drive axle to the rear wheels.

[0030] In the aforementioned saddle-type vehicle, The length of the pivot range of motion in the vertical direction of the saddle-type vehicle is defined as the first length. The length of the pivot range of motion in the longitudinal direction of the aforementioned saddle-type vehicle is defined as the second length. The second length is shorter than the first length. It is preferable. The first length corresponds to the upper limit of the first movement of the pivot axis. The second length corresponds to the upper limit of the second movement of the pivot axis. Therefore, it is easy to increase the amount of the first movement of the pivot axis. Thus, it is easy to reduce the change in the angle of the rear arm. Furthermore, it is easy to decrease the amount of the second movement of the pivot axis.

[0031] In the aforementioned saddle-type vehicle, The rotating member has an arm shape extending from the first axis to the pivot axis in a side view of the saddle-type vehicle. It is preferable. Therefore, the rotating member does not have a disc shape centered on the first axis. Thus, it is easy to reduce the size of the rotating member.

[0032] In the aforementioned saddle-type vehicle, The aforementioned rotating member is The rear end supported by the first shaft, The front end supporting the pivot axis, has It is preferable. Therefore, it is easy to reduce the size of the rotating member.

[0033] In the aforementioned saddle-type vehicle, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the pivot axis and the axis of the rear axle is defined as the second distance. The second distance is equivalent to or smaller than 15 times the first distance. It is preferable. Therefore, even when the second distance is relatively short, it is easy to minimize the change in the angle of the rear arm.

[0034] In the aforementioned saddle-type vehicle, When the first distance is 100 mm or more, the second distance is equal to or smaller than five times the first distance. It is preferable. Therefore, even when the second distance is even shorter, it is easy to minimize the change in the angle of the rear arm.

[0035] In the aforementioned saddle-type vehicle, The aforementioned second distance is 750 mm or less. It is preferable. Therefore, even if the second distance is 750mm or less, it is easy to minimize the change in the angle of the rear arm.

[0036] In the aforementioned saddle-type vehicle, When the rear arm moves relative to the vehicle frame, the coupling mechanism rotates the rotating member around the first axis relative to the vehicle frame. It is preferable. When the rear arm moves relative to the vehicle frame, the rear axle also moves relative to the vehicle frame. When the coupling mechanism rotates the rotating member around the first axis relative to the vehicle frame, the pivot axis moves relative to the vehicle frame. Therefore, it is easy for the pivot axis to move relative to the vehicle frame when the rear axle moves relative to the vehicle frame. Thus, it is easy to minimize the change in the angle of the rear arm.

[0037] In the aforementioned saddle-type vehicle, When the rear axle moves upward relative to the vehicle frame, the coupling mechanism moves the pivot shaft upward relative to the vehicle frame. When the rear axle moves downward relative to the vehicle frame, the coupling mechanism moves the pivot shaft downward relative to the vehicle frame. It is preferable. Therefore, it is easy to minimize the change in the angle of the rear arm when the rear axle moves upward relative to the vehicle frame. Similarly, it is easy to minimize the change in the angle of the rear arm when the rear axle moves downward relative to the vehicle frame.

[0038] In the aforementioned saddle-type vehicle, In a left-side view of the aforementioned saddle-type vehicle, when the rear axle rotates clockwise around the pivot axis, the pivot axis rotates counterclockwise around the first axis. In a left-side view of the aforementioned saddle-type vehicle, when the rear axle rotates counterclockwise around the pivot axis, the pivot axis rotates clockwise around the first axis. It is preferable. In other words, the pivot axis rotates in the opposite direction to the rear axle. Therefore, it is easy to minimize the change in the angle of the rear arm.

[0039] In the aforementioned saddle-type vehicle, The aforementioned coupling mechanism is Supported by the aforementioned vehicle frame, a second axle extends in the width direction of the saddle-type vehicle, A first link member connected to the second shaft, A third shaft is supported by the first link member and extends in the width direction of the saddle-type vehicle, A fourth axle is supported by the rear arm and extends in the width direction of the saddle-type vehicle, A second link member connected to the third and fourth axes, A fifth axle is supported by the first link member and extends in the width direction of the saddle-type vehicle, A sixth axle, supported by the rotating member and extending in the width direction of the saddle-type vehicle, A third link member connected to the fifth and sixth axes, Equipped with It is preferable. When the rear axle moves relative to the vehicle frame, the rear arm and the fourth axle move relative to the vehicle frame. When the fourth axle moves relative to the vehicle frame, the second link member moves relative to the vehicle frame. When the second link member moves relative to the vehicle frame, the third axle, the first link member, and the fifth axle rotate around the second axle relative to the vehicle frame. When the fifth axle rotates around the second axle relative to the vehicle frame, the third link member moves relative to the vehicle frame. When the third link member moves relative to the vehicle frame, the sixth axle, the rotating member, and the pivot axis rotate around the first axle relative to the vehicle frame. In summary, it is easy for the coupling mechanism to move the pivot axis relative to the vehicle frame when the rear axle moves relative to the vehicle frame.

[0040] In the aforementioned saddle-type vehicle, The first link member is configured to rotate around the second axis relative to the vehicle body frame, The second link member is configured to rotate about the third axis relative to the first link member and about the fourth axis relative to the rear arm. The third link member is configured to rotate about the fifth axis relative to the first link member and about the sixth axis relative to the rotating member. It is preferable. Therefore, when the rear axle moves relative to the vehicle frame, it is easier for the coupling mechanism to rotate the rotating member around the first axle relative to the vehicle frame. Thus, when the rear axle moves relative to the vehicle frame, it is easier for the coupling mechanism to rotate the pivot axis around the first axle relative to the vehicle frame.

[0041] In the aforementioned saddle-type vehicle, The aforementioned rear axle is positioned behind the pivot axis. The fourth axis is positioned behind the pivot axis. The third axis is positioned behind the second axis. The fifth axis is positioned behind the second axis. The sixth axis is positioned in front of the first axis. The pivot axis is positioned in front of the first axis. It is preferable.

[0042] The movement of the rear axle and the fourth axle is described below. The rear axle is located behind the pivot axis. The fourth axle is also located behind the pivot axis. The rear axle and the fourth axle are connected by a rear arm. The rear arm is configured to rotate around the pivot axis. Therefore, when the rear axle moves upward, the fourth axle moves upward. When the rear axle moves downward, the fourth axle moves downward.

[0043] The movement of the fourth and third axes will now be explained. The fourth and third axes are connected by a second link member. Therefore, when the fourth axis moves upward, the third axis moves upward. When the fourth axis moves downward, the third axis moves downward.

[0044] The movement of the third and fifth axes will now be described. The third axis is positioned behind the second axis. The fifth axis is positioned behind the second axis. The third and fifth axes are connected by a first link member. The first link member is configured to rotate around the second axis. Therefore, when the third axis moves upward, the fifth axis moves upward. When the third axis moves downward, the fifth axis moves downward.

[0045] The movement of the fifth and sixth axes will now be described. The fifth and sixth axes are connected by the third link member. Therefore, when the fifth axis moves upward, the sixth axis moves upward. When the fifth axis moves downward, the sixth axis moves downward.

[0046] The movement of the sixth axis and the pivot axis is described below. The sixth axis is positioned in front of the first axis. The pivot axis is also positioned in front of the first axis. The sixth axis and the pivot axis are connected by a rotating member. The rotating member is configured to rotate around the first axis. Therefore, when the sixth axis moves upward, the pivot axis moves upward. When the sixth axis moves downward, the pivot axis moves downward.

[0047] In summary, when the rear axle moves upward, the pivot axis moves upward. When the rear axle moves downward, the pivot axis moves downward. Therefore, it is easy to minimize the change in the angle of the rear arm.

[0048] In the aforementioned saddle-type vehicle, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the pivot axis and the axis of the sixth axis is defined as the third distance. In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the sixth axle and the axis of the first axle is defined as the fourth distance. The third distance is shorter than the fourth distance. It is preferable. Therefore, when the coupling mechanism rotates the rotating member around the first axis relative to the vehicle frame, the load on the coupling mechanism is relatively small. Thus, it is easy for the coupling mechanism to rotate the rotating member around the first axis relative to the vehicle frame. Consequently, it is easy for the coupling mechanism to rotate the pivot axis around the first axis relative to the vehicle frame.

[0049] In the aforementioned saddle-type vehicle, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the sixth axle and the axis of the first axle is defined as the fourth distance. The fourth distance is longer than half of the first distance. It is preferable. Therefore, when the coupling mechanism rotates the rotating member around the first axis relative to the vehicle frame, the load on the coupling mechanism is relatively small. Thus, it is easy for the coupling mechanism to rotate the rotating member around the first axis relative to the vehicle frame. Consequently, it is easy for the coupling mechanism to rotate the pivot axis around the first axis relative to the vehicle frame.

[0050] In the aforementioned saddle-type vehicle, The sixth axis is positioned behind the pivot axis and in front of the first axis. It is preferable. Therefore, it is easy to reduce the size of the rotating member.

[0051] In the aforementioned saddle-type vehicle, The range in which the sixth axis can move is defined as the range of motion of the sixth axis. The range of motion of the sixth axis is limited to the area in front of the first axis. It is preferable. Therefore, it is easy to limit the pivot range of motion to the area in front of the first axis. Thus, it is easy to reduce the amount of the second movement of the pivot axis.

[0052] In the aforementioned saddle-type vehicle, The pivot range of motion is limited to the area in front of the front end of the sixth axis range of motion. It is preferable. The pivot range of motion does not include anything behind the front end of the sixth axis range of motion. Therefore, it is easy to reduce the amount of the second movement of the pivot axis.

[0053] In the aforementioned saddle-type vehicle, The vehicle body frame and the rear suspension connected to the rear arm, Equipped with It is preferable. As mentioned above, it is easy to reduce the angle of the rear arm. Therefore, it is easy to adjust the rear suspension. For example, it is easy to improve the ride comfort of a saddle-type vehicle by adjusting the rear suspension settings.

[0054] In the aforementioned saddle-type vehicle, The rear suspension is connected to the rear arm via the connecting mechanism. It is preferable. Therefore, connecting the rear suspension to the rear arm is easy.

[0055] In the aforementioned saddle-type vehicle, The rear suspension is connected to the rear arm via the first link member. It is preferable. Therefore, connecting the rear suspension to the rear arm is easy.

[0056] In the aforementioned saddle-type vehicle, A seventh axle is supported by the vehicle body frame and extends in the width direction of the saddle-type vehicle, Supported by the first link member, the eighth axle extends in the width direction of the saddle-type vehicle, Equipped with, The rear suspension is connected to the seventh axle and the eighth axle. It is preferable. Therefore, connecting the rear suspension to the vehicle frame and rear arm is easy.

[0057] In the aforementioned saddle-type vehicle, The drive shaft that outputs power, A drive mechanism connected to the drive shaft and the rear wheel, configured to transmit power from the drive shaft to the rear wheel, Equipped with, The drive shaft is positioned in front of the pivot shaft. It is preferable. The drive shaft outputs power. The drive mechanism is connected to the drive shaft and the rear wheel. The drive mechanism is configured to transmit power from the drive shaft to the rear wheel. Therefore, it is easy to rotate the rear wheel around the rear axle. As mentioned above, the first distance is 50 mm or more. Therefore, it is easy to reduce the amount of the second movement of the pivot shaft. Thus, it is easy to reduce the change in distance between the rear axle and the drive shaft. Consequently, it is easy for the drive mechanism to transmit power from the drive shaft to the rear wheel.

[0058] In the aforementioned saddle-type vehicle, The drive mechanism comprises a drive shaft and a chain connected to the rear wheel. The aforementioned saddle-type vehicle does not have a mechanism for adjusting the tension of the chain. It is preferable. Therefore, the drive mechanism has a simple structure.

[0059] In the aforementioned saddle-type vehicle, Even when the pivot axis moves relative to the vehicle frame, the chain remains taut without the use of a mechanism to adjust the chain tension. It is preferable. In other words, the chain is less likely to slacken even without a mechanism to adjust the chain tension. Therefore, the drive mechanism does not need to be equipped with a mechanism to adjust the chain tension.

[0060] In the aforementioned saddle-type vehicle, The movement of the aforementioned linking mechanism is independent of the change in tension of the chain. It is preferable. In other words, in the saddle-type vehicle described above, the movement of the pivot axis relative to the vehicle frame is independent of the change in the tension of the chain. It is preferable. Therefore, it is easy to simplify the coupling mechanism. [Effects of the Invention]

[0061] In a saddle-type vehicle, it is easy to minimize the change in the angle of the rear arm. Furthermore, in a saddle-type vehicle, it is easy to minimize the amount of the second movement of the pivot axis. [Brief explanation of the drawing]

[0062] [Figure 1] This is a left side view of a saddle-type vehicle according to an embodiment. [Figure 2] This is a left side view showing the rear arm and its surrounding mechanisms. [Figure 3] Figures 3(a) to 3(c) are schematic diagrams illustrating the operation of the rear arm and its surrounding mechanisms. [Figure 4] This diagram illustrates the angle of the rear arm in the saddle-type vehicle of this embodiment. [Figure 5] This diagram illustrates the angle of the rear arm in a saddle-type vehicle, which is a comparative example. [Figure 6] This is a side view of the pivot axis in the saddle-type vehicle of this embodiment. [Figure 7] This is a side view of the drive shaft, first shaft, pivot shaft, and rear axle in the saddle-type vehicle of this embodiment. [Figure 8] This is a side view of the drive shaft, pivot shaft, and rear axle in a comparative example saddle-type vehicle. [Modes for carrying out the invention]

[0063] The saddle-type vehicle 1 according to the present invention will be described below with reference to the drawings.

[0064] <1. Outline configuration of saddle-type vehicle 1> Figure 1 is a left side view of the saddle-type vehicle 1 according to this embodiment. The schematic configuration of the saddle-type vehicle 1 will now be described.

[0065] Figure 1 shows the longitudinal direction X, width direction Y, and vertical direction Z of the saddle-type vehicle 1. The longitudinal direction X, width direction Y, and vertical direction Z are defined relative to the driver (also called the rider) riding in the saddle-type vehicle 1. The longitudinal direction X, width direction Y, and vertical direction Z are orthogonal to each other. The longitudinal direction X and width direction Y are horizontal. The vertical direction Z is vertical.

[0066] "Front," "rear," "up," "down," "right," and "left" refer to the directions "front," "rear," "up," "down," "right," and "left," respectively, from the perspective of a driver riding in the saddle-type vehicle 1. Unless otherwise specified in this specification, "front" and "rear" include not only directions parallel to the longitudinal direction X, but also directions close to the longitudinal direction X. Directions close to the longitudinal direction X are, for example, directions with an angle of 45 degrees or less with respect to the longitudinal direction X. Similarly, unless otherwise specified, "right" and "left" include not only directions parallel to the width direction Y, but also directions close to the width direction Y. Unless otherwise specified, "up" and "down" include not only directions parallel to the up-down direction Z, but also directions close to the up-down direction Z. "Parallel" and "horizontal" include not only parallel and horizontal, but also nearly parallel and nearly horizontal. Nearly parallel is also called approximately parallel. Nearly horizontal is also called approximately horizontal. In each figure, FRONT, REAR, UP, and DOWN are shown as appropriate for reference.

[0067] In this specification, "in a side view of the saddle-type vehicle 1" will be appropriately referred to as "in a side view of the vehicle." "in a left side view of the saddle-type vehicle 1" will be appropriately referred to as "in a left side view of the vehicle." "in a top view of the saddle-type vehicle 1" will be appropriately referred to as "in a top view of the vehicle." "in a front view of the saddle-type vehicle 1" will be appropriately referred to as "in a front view of the vehicle."

[0068] The saddle-type vehicle 1 comprises a body frame 2 and a steering device 3. The body frame 2 extends in the longitudinal direction X. The steering device 3 is supported at the front of the body frame 2. The steering device 3 is rotatable relative to the body frame 2.

[0069] The steering system 3 comprises a steering wheel 4, a front suspension 5, and a front axle F. The steering wheel 4 is located at the top of the steering system 3. The front suspension 5 extends downward from the steering wheel 4. The front axle F is located at the bottom of the steering system 3. The front axle F is supported by the front suspension 5. The driver of the saddle-type vehicle 1 steers the steering system 3 by gripping the steering wheel 4.

[0070] The saddle-type vehicle 1 is equipped with front wheels 8. The front wheels 8 are supported by a steering device 3. Specifically, the front wheels 8 are supported by the front axle F. The front wheels 8 are rotatable around the front axle F.

[0071] The vehicle frame 2 comprises a main frame 6. The main frame 6 extends from the front to the rear of the vehicle frame 2. More specifically, in a side view of the vehicle, the main frame 6 extends rearward and downward.

[0072] The saddle-type vehicle 1 is equipped with an engine 10. The engine 10 generates power to propel the saddle-type vehicle 1. At least a portion of the engine 10 is located below the main frame 6 in a side view of the vehicle. The engine 10 is located behind the steering device 3 and the front wheels 8 in a side view of the vehicle. The engine 10 is supported by the vehicle body frame 2. For example, the engine 10 is supported by the main frame 6. The engine 10 is fixed to the vehicle body frame 2. The engine 10 does not swing relative to the vehicle body frame 2.

[0073] The saddle-type vehicle 1 is equipped with a drive shaft D. The drive shaft D outputs power. For example, the drive shaft D is connected to an engine 10. The engine 10 outputs power to the drive shaft D. The drive shaft D outputs power from the engine 10. Alternatively, the drive shaft D is connected to a transmission (not shown). The transmission is connected to the engine 10. The transmission outputs power to the drive shaft D.

[0074] The saddle-type vehicle 1 is equipped with a drive sprocket DS. The drive sprocket DS is connected to the drive shaft D. The drive sprocket DS rotates integrally with the drive shaft D.

[0075] The saddle-type vehicle 1 is equipped with a fuel tank 14. The fuel tank 14 stores fuel. In a side view of the vehicle, the fuel tank 14 is located behind the steering device 3 and the front wheels 8. In a side view of the vehicle, the fuel tank 14 is located above the engine 10. At least a portion of the fuel tank 14 is located above the main frame 6 in a side view of the vehicle. At least a portion of the fuel tank 14 is located at the same height as the steering wheel 4 in a side view of the vehicle. The fuel tank 14 is supported by the vehicle body frame 2.

[0076] The saddle-type vehicle 1 is equipped with a seat 7. The seat 7 is located behind the fuel tank 14. At least a portion of the seat 7 is positioned at the same height as the fuel tank 14 when viewed from the side of the vehicle. The seat 7 is located behind and above the engine 10. The seat 7 is supported by the vehicle frame 2.

[0077] The driver sits straddling the seat 7 and performs a knee grip. A knee grip involves the driver gripping a portion of the saddle-type vehicle 1 with both legs. The portion of the saddle-type vehicle 1 is, for example, at least a portion of the main frame 6 and the fuel tank 14.

[0078] The saddle-type vehicle 1 is equipped with a pivot axis P. The pivot axis P is located behind the engine 10. The pivot axis P is located below the fuel tank 14 and the seat 7. The pivot axis P is located behind the drive axis D. The position of the pivot axis P changes as described later.

[0079] The pivot axis P extends in the width direction Y.

[0080] The saddle-type vehicle 1 is equipped with a rear arm 9. The rear arm 9 is supported by a pivot axis P. The rear arm 9 extends rearward from the pivot axis P. The rear arm 9 extends slightly diagonally downward from the pivot axis P. The rear arm 9 is pivotable around the pivot axis P. The rear arm 9 rotates around the pivot axis P relative to the vehicle frame 2.

[0081] The saddle-type vehicle 1 is equipped with a rear axle R. The rear axle R is supported by a rear arm 9. The rear axle R is supported at the rear of the rear arm 9. The rear axle R extends in the width direction Y. The rear axle 11 is positioned below the drive axis D and the pivot axis P.

[0082] The saddle-type vehicle 1 is equipped with rear wheels 11. The rear wheels 11 are supported by the rear axle R. The rear wheels 11 are supported by the rear arm 9 via the rear axle R. The rear wheels 11 are rotatable around the rear axle R.

[0083] The saddle-type vehicle 1 is equipped with a driven sprocket RS. The driven sprocket RS is rotatable around the rear axle R. The driven sprocket RS is connected to the rear wheel 11. The driven sprocket RS rotates together with the rear wheel 11.

[0084] The saddle-type vehicle 1 is equipped with a drive mechanism 12. The drive mechanism 12 is connected to the drive shaft D and the rear wheels 11. The drive mechanism 12 is configured to transmit power from the drive shaft D to the rear wheels 11. The power transmitted from the drive shaft D to the rear wheels 11 causes the rear wheels 11 to rotate around the rear axle R.

[0085] The drive mechanism 12 includes a chain 13. The chain 13 is connected to the drive shaft D and the rear wheel 11. For example, the chain 13 is wrapped around the drive sprocket DS and the driven sprocket RS.

[0086] The saddle-type vehicle 1 does not have a mechanism for adjusting the tension of the chain 13.

[0087] <2. First Axis and Rotating Member> Figure 2 is a left side view showing the rear arm 9 and its surrounding mechanism. Figure 2 is illustrated as a left side view of the vehicle.

[0088] The saddle-type vehicle 1 further comprises a first axle A1. The first axle A1 is supported by the vehicle frame 2. For example, the first axle A1 is supported by the main frame 6. The first axle A1 extends in the width direction Y.

[0089] Here, the axis of the first axis A1 is called axis a1. The axis of the drive axis D is called axis d. The first axis A1 is located at approximately the same height as the drive axis D. Comparing axis a1 and axis d, axis a1 is located slightly above axis d.

[0090] The position of the first axle A1 does not change relative to the vehicle frame 2. The position of axis a1 does not change relative to the vehicle frame 2.

[0091] The position of drive shaft D does not change relative to the vehicle frame 2. The position of axis d does not change relative to the vehicle frame 2.

[0092] The saddle-type vehicle 1 is equipped with a rotating member 19. The rotating member 19 is located inward in the width direction Y from the vehicle body frame 2. At least a portion of the rotating member 19 overlaps with the vehicle body frame 2 in a side view of the vehicle.

[0093] The rotating member 19 has, for example, an arm shape. The arm shape extends at least in the front-rear direction X.

[0094] The rotating member 19 has an arm shape extending forward from the first axis A1. The rotating member 19 has an arm shape extending from the first axis A1 to the pivot axis P.

[0095] The arm shape is not one that extends rearward from the first axis A1. The rotating member 19 is not a disc shape centered on the first axis A1.

[0096] The rotating member 19 has a front end 19A and a rear end 19B. The front end 19A supports the pivot axis P. The rear end 19B is supported by the first axis A1.

[0097] The rotating member 19 is supported by the first axle A1. The rotating member 19 is configured to rotate around the first axle A1 relative to the vehicle frame 2.

[0098] The pivot axis P is supported by the rotating member 19. The pivot axis P rotates around the first axis A1 relative to the vehicle frame 2.

[0099] The rear arm 9 is configured to rotate around the pivot axis P relative to the rotating member 19.

[0100] The rear arm 9 is located inward in the width direction Y compared to the vehicle body frame 2 and the rotating member 19. A portion of the rear arm 9 overlaps with the vehicle body frame 2 and the rotating member 19 in a side view of the vehicle.

[0101] <3.Connection mechanism> The saddle-type vehicle 1 is equipped with a coupling mechanism 18. The coupling mechanism 18 is connected to the vehicle body frame 2, the rotating member 19, and the rear arm 9.

[0102] The connecting mechanism 18 comprises a second shaft 31, a first link member 32, a third shaft 33, a fourth shaft 34, a second link member 35, a fifth shaft 36, a sixth shaft 37, and a third link member 38.

[0103] The second axle 31 is supported by the vehicle frame 2. For example, the second axle 31 is supported by the main frame 6. The second axle 31 extends in the width direction Y.

[0104] The position of the second axle 31 does not change relative to the vehicle frame 2.

[0105] The first link member 32 is connected to the second shaft 31.

[0106] The first link member 32 is configured to rotate around the second shaft 31 relative to the vehicle body frame 2.

[0107] The third shaft 33 is supported by the first link member 32 and extends in the width direction Y. The third shaft 33 rotates around the second shaft 31. The third shaft 33 rotates in conjunction with the rotation of the first link member 32.

[0108] The fourth shaft 34 is supported by the rear arm 9 and extends in the width direction Y. Specifically, the fourth shaft 34 is supported by the lower edge 9A of the rear arm 9.

[0109] The second link member 35 is connected to the third shaft 33 and the fourth shaft 34. In other words, the second link member 35 connects the first link member 32 and the rear arm 9.

[0110] The second link member 35 is configured to rotate around the third axis 33 relative to the first link member 32, and around the fourth axis 34 relative to the rear arm 9.

[0111] The fifth axle 36 is supported by the first link member 32 and extends in the width direction Y. The fifth axle 36 rotates around the second axle 31 relative to the vehicle frame 2.

[0112] The sixth axis 37 is supported by the rotating member 19 and extends in the width direction Y.

[0113] The third link member 38 is connected to the fifth shaft 36 and the sixth shaft 37. The third link member 38 connects the first link member 32 and the rotating member 19.

[0114] The third link member 38 is configured to rotate around the fifth axis 36 relative to the first link member 32. The third link member 38 is configured to rotate around the sixth axis 37 relative to the rotating member 19.

[0115] The rotating member 19 connects the sixth axis 37 and the pivot axis P. The rotating member 19 also connects the pivot axis P and the first axis A1.

[0116] The rotating member 19 is configured to rotate around the sixth axis 37 relative to the third link member 38.

[0117] The saddle-type vehicle 1 is equipped with a rear suspension 15. The rear suspension 15 is connected to the vehicle frame 2 and the rear arm 9.

[0118] The rear suspension 15 is connected to the rear arm 9 via a connecting mechanism 18.

[0119] Specifically, the rear suspension 15 is connected to the rear arm 9 via the first link member 32.

[0120] The saddle-type vehicle 1 is equipped with a seventh axle 39 and an eighth axle 40.

[0121] The seventh axle 39 is supported by the vehicle frame 2 and extends in the width direction Y. The eighth axle 40 is supported by the first link member 32 and extends in the width direction Y. The rear suspension 15 is connected to the seventh axle 39 and the eighth axle 40.

[0122] The coupling mechanism 18 does not come into contact with the chain 13. The coupling mechanism 18 is not a mechanism for adjusting the tension of the chain 13. Therefore, the movement of the coupling mechanism 18 is independent of changes in the tension of the chain 13. In other words, the movement of the pivot axis P relative to the vehicle frame 2 is independent of changes in the tension of the chain 13.

[0123] <4. Layout> Refer to Figure 2. In a left side view of the vehicle, the first axle A1 overlaps with the vehicle frame 2. In a left side view of the vehicle, the first axle A1 is positioned behind the pivot axis P. In a left side view of the vehicle, the first axle A1 is positioned in front of the rear axle R.

[0124] In a left-side view of the vehicle, the pivot axis P does not overlap with the vehicle frame 2. The pivot axis P is positioned forward of the first axis A1.

[0125] The pivot axis P is located near the front end 19A. The first axis A1 is located near the rear end 19B. Specifically, the pivot axis P is located slightly behind the front end 19A. The first axis A1 is located slightly in front of the rear end 19B.

[0126] The drive axis D is positioned in front of the pivot axis P.

[0127] The rear axle R is positioned behind the pivot axis P.

[0128] The second axis 31 is positioned below the first axis A1.

[0129] The third axis 33 is positioned behind the second axis 31. The axis of the third axis 33 is positioned behind the axis of the second axis 31.

[0130] The fourth axis 34 is positioned behind the pivot axis P. The fourth axis 34 is positioned behind the second axis 31.

[0131] The fifth axis 36 is positioned behind the second axis 31.

[0132] The sixth axis 37 is positioned in front of the first axis A1. The sixth axis 37 is positioned behind the pivot axis P.

[0133] Here, the axis of the pivot axis P is called axis p. Axis p is parallel to the width direction Y. Axis a1 is parallel to the width direction Y. In a side view of the vehicle, the distance between axis a1 and axis p is called the first distance E1.

[0134] The first distance E1 is 50mm or more. The first distance E1 is relatively large.

[0135] The axis of the rear axle R is called axis r. Axis r is parallel to the width direction Y. The distance between axis p and axis r in a side view of the vehicle is called the second distance E2.

[0136] The second distance E2 is, for example, equivalent to or less than 15 times the first distance E1.

[0137] For example, the second distance E2 is 15 times or less the length of the first distance E1. For example, the second distance E2 is 14 times or less the length of the first distance E1. For example, the second distance E is 13 times or less the length of the first distance E1.

[0138] For example, the second distance E is more than twice the length of the first distance E1. For example, the second distance E2 is more than three times the length of the first distance E1. For example, the second distance E2 is more than four times the length of the first distance E1.

[0139] The second distance E2 is, for example, 750mm or less. The second distance E2 is relatively short.

[0140] The axis of the sixth axle 37 is called axis 37z. Axle 37z is parallel to the width direction Y. In a side view of the vehicle, the distance between axis p and axis 37z is called the third distance E3. In a side view of the vehicle, the distance between axis 37z and axis a1 is called the fourth distance E4.

[0141] The third distance, E3, is shorter than the fourth distance, E4.

[0142] The fourth distance E2 is shorter than the first distance E1. The fourth distance E2 is longer than half the length of the first distance E1.

[0143] <5. Operation> Figures 3(a), 3(b), and 3(c) are left side views of parts of the saddle-type vehicle 1, respectively. The movement of the rear axle R and pivot axis P is explained.

[0144] Figures 3(a), 3(b), and 3(c) omit the illustration of the vehicle frame 2, but the rear wheels 11 move relative to the vehicle frame 2. The rear axle R also moves relative to the vehicle frame 2. When the rear axle R moves relative to the vehicle frame 2, the pivot axis P also moves relative to the vehicle frame 2.

[0145] The rear axle R shown in Figure 3(a) is called "rear axle Ra". The rear axle R shown in Figure 3(b) is called "rear axle Rb". The rear axle R shown in Figure 3(c) is called "rear axle Rc". Rear axle Rb is higher than rear axle Ra. Rear axle Rc is higher than rear axle Rb.

[0146] When the rear axle R is the same as the rear axle Ra, the pivot axis P is called "pivot axis Pa". When the rear axle R is the same as the rear axle Rb, the pivot axis P is called "pivot axis Pb". When the rear axle R is the same as the rear axle Rc, the pivot axis P is called "pivot axis Pc". Pivot axis Pb is higher than pivot axis Pa. Pivot axis Pc is lower than pivot axis Pb.

[0147] Therefore, when the rear axle R moves upward, the pivot axis P moves upward. When the rear axle R moves downward, the pivot axis P moves downward.

[0148] Figures 3(a), 3(b), and 3(c) show the imaginary line Q. The imaginary line Q is a straight line connecting axis d and axis a1 in a side view of the vehicle. Axis d is parallel to the width direction Y.

[0149] Rear axle Ra is below the imaginary line Q in a side view of the vehicle. Rear axle Rb is on the imaginary line Q in a side view of the vehicle. Rear axle Rc is above the imaginary line Q in a side view of the vehicle. Rear axle R extends from a position below the imaginary line Q to a position above the imaginary line Q in a side view of the vehicle.

[0150] Pivot axis Pa is below the imaginary line Q in a side view of the vehicle. Pivot axis Pb is on the imaginary line Q in a side view of the vehicle. Pivot axis Pc is above the imaginary line Q in a side view of the vehicle. Pivot axis P extends from a position below the imaginary line Q to a position above the imaginary line Q in a side view of the vehicle.

[0151] When the rear axle R is above the virtual line Q, the pivot axis P is also above the virtual line Q. When the rear axle R is on the virtual line Q, the pivot axis P is also on the virtual line Q. When the rear axle R is below the virtual line Q, the pivot axis P is also below the virtual line Q.

[0152] The operation of the coupling mechanism 18 will now be explained. When the rear axle R moves relative to the vehicle frame 2, the coupling mechanism 18 moves the pivot axis P relative to the vehicle frame 2.

[0153] Specifically, when the rear axle R moves relative to the vehicle frame 2, the rear arm 9 rotates around the pivot axis P relative to the rotating member 19. When the rear arm 9 rotates around the pivot axis P relative to the rotating member 19, the rear arm 9 moves relative to the vehicle frame 2. When the rear arm 9 moves relative to the vehicle frame 2, the coupling mechanism 18 rotates the rotating member 19 around the first axis A1 relative to the vehicle frame 2. When the coupling mechanism 18 rotates the rotating member 19 around the first axis A1 relative to the vehicle frame 2, the pivot axis P rotates around the first axis A1 relative to the vehicle frame 2.

[0154] For example, when the rear axle R moves upward relative to the vehicle frame 2, the coupling mechanism 18 moves the pivot axis P upward relative to the vehicle frame 2.

[0155] For example, when the rear axle R moves downward relative to the vehicle frame 2, the coupling mechanism 18 moves the pivot axis P downward relative to the vehicle frame 2.

[0156] The operation of the third axis 33, the fourth axis 34, the fifth axis 36, and the sixth axis 37 will be described.

[0157] When the rear axle R is rear axle Ra, the third axle 33 is called "third axle 33a". When the rear axle R is rear axle Rb, the third axle 33 is called "third axle 33b". When the rear axle R is rear axle Rc, the third axle 33 is called "third axle 33c". The third axle 33b is higher than the third axle 33a. The third axle 33c is higher than the third axle 33b.

[0158] Similarly, when the rear axle R is rear axle Ra, Rb, or Rc, the fourth axle 34 is called "fourth axle 34a," "fourth axle 34b," or "fourth axle 34c," respectively. The fourth axle 34b is higher than the fourth axle 34a. The fourth axle 34c is higher than the fourth axle 34b.

[0159] When the rear axle R is rear axle Ra, Rb, or Rc, the fifth axle 36 is called "fifth axle 36a," "fifth axle 36b," or "fifth axle 36c," respectively. The fifth axle 36b is higher than the fifth axle 36a. The fifth axle 36c is higher than the fifth axle 36b.

[0160] When the rear axle R is rear axle Ra, Rb, or Rc, the sixth axle 37 is called "sixth axle 37a," "sixth axle 37b," or "sixth axle 37c," respectively. The sixth axle 37b is higher than the sixth axle 37a. The sixth axle 37c is higher than the sixth axle 37b.

[0161] Therefore, when the rear axle R moves upward, the third axle 33, fourth axle 34, fifth axle 36, and sixth axle 37 each move upward. When the rear axle R moves downward, the third axle 33, fourth axle 34, fifth axle 36, and sixth axle 37 each move downward.

[0162] The operation of the coupling mechanism 18 when the rear axle R moves upward will be explained in detail.

[0163] When the rear axle R moves upward relative to the vehicle frame 2, the rear axle R rotates counterclockwise around the pivot axis P when viewed from the left side of the vehicle. Furthermore, when the rear axle R moves upward relative to the vehicle frame 2, the fourth axle 34 also moves upward relative to the vehicle frame 2.

[0164] When the fourth axle 34 moves upward relative to the vehicle frame 2, the second link member 35 also moves upward relative to the vehicle frame 2.

[0165] When the second link member 35 moves upward relative to the vehicle frame 2, the third axle 33 also moves upward relative to the vehicle frame 2. Specifically, in a view of the left side of the vehicle, the third axle 33 rotates counterclockwise around the second axle 31 relative to the vehicle frame 2.

[0166] When the third axle 33 moves upward relative to the vehicle frame 2, the first link member 32 rotates counterclockwise around the second axle 31 relative to the vehicle frame 2 when viewed from the left side of the vehicle.

[0167] When the first link member 32 rotates counterclockwise around the second axle 31 relative to the vehicle frame 2 in a left-side view of the vehicle, the fifth axle 36 moves upward relative to the vehicle frame 2. Specifically, the fifth axle 36 rotates counterclockwise around the second axle 31 relative to the vehicle frame 2 in a left-side view of the vehicle.

[0168] When the fifth axle 36 moves upward relative to the vehicle frame 2, the third link member 38 also moves upward relative to the vehicle frame 2.

[0169] When the third link member 38 moves upward relative to the vehicle frame 2, the sixth axle 37 also moves upward relative to the vehicle frame 2.

[0170] When the sixth axle 37 moves upward relative to the vehicle frame 2, the rotating member 19 rotates clockwise around the first axle A1 relative to the vehicle frame 2 when viewed from the left side of the vehicle.

[0171] When the rotating member 19 rotates clockwise around the first axis A1 relative to the vehicle frame 2 in a left-side view of the vehicle, the pivot axis P moves upward relative to the vehicle frame 2. Specifically, the pivot axis P rotates clockwise around the first axis A1 relative to the vehicle frame 2 in a left-side view of the vehicle.

[0172] In summary, when the rear axle R moves upward, the pivot axis P also moves upward. When the rear axle R rotates counterclockwise around the pivot axis P in a left side view of the vehicle, the pivot axis P rotates clockwise around the first axle A1.

[0173] The operation of the coupling mechanism 18 when the rear axle R moves downward will be explained in detail.

[0174] When the rear axle R moves downward relative to the vehicle frame 2, the rear axle R rotates clockwise around the pivot axis P in a left side view of the vehicle. Furthermore, when the rear axle R moves downward relative to the vehicle frame 2, the fourth axle 34 also moves downward relative to the vehicle frame 2.

[0175] When the fourth axle 34 moves downward relative to the vehicle frame 2, the second link member 35 also moves downward relative to the vehicle frame 2.

[0176] When the second link member 35 moves downward relative to the vehicle frame 2, the third axle 33 also moves downward relative to the vehicle frame 2. Specifically, in a view of the left side of the vehicle, the third axle 33 rotates clockwise around the second axle 31 relative to the vehicle frame 2.

[0177] When the third axle 33 moves downward relative to the vehicle body frame 2, the first link member 32 rotates clockwise around the second axle 31 relative to the vehicle body frame 2 when viewed from the left side of the vehicle.

[0178] When the first link member 32 rotates clockwise around the second axle 31 relative to the vehicle frame 2 in a left-side view of the vehicle, the fifth axle 36 moves downward relative to the vehicle frame 2. Specifically, the fifth axle 36 rotates clockwise around the second axle 31 relative to the vehicle frame 2 in a left-side view of the vehicle.

[0179] When the fifth axle 36 moves downward relative to the vehicle frame 2, the third link member 38 moves downward relative to the vehicle frame 2.

[0180] When the third link member 38 moves downward relative to the vehicle frame 2, the sixth axle 37 also moves downward relative to the vehicle frame 2.

[0181] When the sixth axle 37 moves downward relative to the vehicle frame 2, the rotating member 19 rotates counterclockwise around the first axle A1 relative to the vehicle frame 2 when viewed from the left side of the vehicle.

[0182] When the rotating member 19 rotates counterclockwise around the first axis A1 relative to the vehicle frame 2 in a view of the left side of the vehicle, the pivot axis P moves downward relative to the vehicle frame 2. Specifically, the pivot axis P rotates counterclockwise around the first axis A1 relative to the vehicle frame 2 in a view of the left side of the vehicle.

[0183] In summary, when the rear axle R moves downward, the pivot axis P also moves downward. When the rear axle R rotates clockwise around the pivot axis P in a left side view of the vehicle, the pivot axis P rotates counterclockwise around the first axis A1.

[0184] <6. Changes in the angle of the rear arm> Figure 4 illustrates the angle of the rear arm 9 in the saddle-type vehicle 1 of this embodiment. Figure 4 shows the drive shaft D, the first shaft A1, the rear axle R, and the pivot shaft P. Figure 4 shows the rear axle Ra, Rb, and Rc as the rear axle R. Figure 4 shows the pivot shafts Pa, Pb, and Pc as the pivot shaft P. Note that Figure 4 omits the illustration of the vehicle frame 2 and the rear arm 9.

[0185] Figure 4 shows the axis J of the rear arm 9. Axis J is a virtual line connecting the axis p of the pivot axis P and the axis r of the rear axle R in a side view of the vehicle.

[0186] When the rear axle R moves relative to the vehicle frame 2, the position of the axis J changes relative to the vehicle frame 2.

[0187] When the rear axle R is the same as the rear axle Ra, the axis J is called "axis Ja". When the rear axle R is the same as the rear axle Rb, the axis J is called "axis Jb". When the rear axle R is the same as the rear axle Rc, the axis J is called "axis Jc".

[0188] When the pivot axis P moves relative to the vehicle frame 2, the position of axis J changes relative to the vehicle frame 2. Axis Ja is axis J when pivot axis P is pivot axis Pa. Axis Jb is axis J when pivot axis P is pivot axis Pb. Axis Jc is axis J when pivot axis P is pivot axis Pc.

[0189] Figure 4 shows the angle Θ of the rear arm 9. The angle Θ is, for example, the angle between the axis J and the reference line K in a side view of the vehicle.

[0190] The reference line K is, for example, parallel to the vertical direction Z. When the rear axle R moves relative to the vehicle frame 2, the position of the reference line K does not change relative to the vehicle frame 2. When the pivot axis P moves relative to the vehicle frame 2, the position of the reference line K does not change relative to the vehicle frame 2.

[0191] When the rear axle R moves relative to the vehicle frame 2, the angle Θ changes.

[0192] The angle Θ when the rear axle R is the same as the rear axle Ra is called "angle Θa". The angle Θ when the rear axle R is the same as the rear axle Rb is called "angle Θb". The angle Θ when the rear axle R is the same as the rear axle Rc is called "angle Θc".

[0193] When the pivot axis P moves relative to the vehicle frame 2, the angle Θ changes.

[0194] Angle Θa is the angle Θ when pivot axis P is pivot axis Pa. Angle Θb is the angle Θ when pivot axis P is pivot axis Pb. Angle Θc is the angle Θ when pivot axis P is pivot axis Pc.

[0195] The difference between angles Θa and Θb is relatively small. When the rear axle R moves between rear axle Ra and rear axle Rb, the change in angle Θ is small.

[0196] The difference between angles Θb and Θc is relatively small. When the rear axle R moves between rear axle Rb and rear axle Rc, the change in angle Θ is small.

[0197] Figure 5 illustrates the angle of the rear arm in the comparative example saddle-type vehicle 100. The comparative example saddle-type vehicle 100 includes a body frame (not shown) and a rear arm (not shown). The saddle-type vehicle 100 includes a pivot axis P and a rear axle R. In the saddle-type vehicle 100, the position of the pivot axis P does not change relative to the body frame. In the saddle-type vehicle 100, the position of the rear axle R changes relative to the body frame. In the saddle-type vehicle 100, the rear axle R rotates around the pivot axis P relative to the body frame.

[0198] Figure 5 shows the rear axle Rd, Re, and Rf. Rear axle Re is higher than rear axle Rd. Rear axle Rf is higher than rear axle Re.

[0199] The rear arm of the saddle-type vehicle 100 extends from the pivot axis P to the rear axle R. The rear arm of the saddle-type vehicle 100 has an axis J.

[0200] In the saddle-type vehicle 100, when the rear axle R moves relative to the vehicle frame, the position of the axis J changes relative to the vehicle frame 2.

[0201] When the rear axle R is rear axle Rd, the axis J is called "axis Jd". When the rear axle R is rear axle Re, the axis J is called "axis Je". When the rear axle R is rear axle Rf, the axis J is called "axis Jf".

[0202] The rear arm of the saddle-type vehicle 100 has an angle Θ.

[0203] In the saddle-type vehicle 100, the angle Θ changes when the rear axle R moves relative to the vehicle frame.

[0204] The angle Θ when the rear axle R is rear axle Rd is called "angle Θd". The angle Θ when the rear axle R is rear axle Re is called "angle Θe". The angle Θ when the rear axle R is rear axle Rf is called "angle Θf".

[0205] The difference between angles Θd and Θe is relatively large. For example, the difference between angles Θd and Θe is greater than the difference between angles Θa and Θb.

[0206] The difference between angles Θe and Θf is relatively large. For example, the difference between angles Θe and Θf is greater than the difference between angles Θb and Θc.

[0207] When the rear axle R moves relative to the vehicle frame, the change in angle Θ of the saddle-type vehicle 1 is smaller than the change in angle Θ of the saddle-type vehicle 100.

[0208] For example, when the rear axle R moves upward relative to the vehicle frame, the change in angle Θ of the saddle-type vehicle 1 is smaller than the change in angle Θ of the saddle-type vehicle 100.

[0209] For example, when the rear axle R moves downward relative to the vehicle frame 2, the change in angle Θ of the saddle-type vehicle 1 is smaller than the change in angle Θ of the saddle-type vehicle 100.

[0210] Let's explain this point in more detail. In the saddle-type vehicle 100, the position of the pivot axis P does not change. Therefore, in the saddle-type vehicle 100, the axis J of the rear arm tilts around the pivot axis P. As a result, in the saddle-type vehicle 100, the change in the tilt of the axis J of the rear arm around the pivot axis P is large. In the saddle-type vehicle 100, the angle Θ is the tilt of the axis J of the rear arm around the pivot axis P. Therefore, in the saddle-type vehicle 100, the axis J of the rear arm tilts significantly in accordance with the movement of the rear axle R. Thus, when the rear axle R moves relative to the vehicle frame, the change in angle Θ of the saddle-type vehicle 100 is large.

[0211] In contrast, in the saddle-type vehicle 1, the pivot axis P of the rear arm 9 moves upward when the rear axle R moves upward. Therefore, for example, axis Ja and axis Jb are parallel or nearly parallel. For example, angles Θa and Θb are equal to or approximate each other. Angles Θb and Θc are equal to or approximate each other. Consequently, even when the rear axle R moves relative to the vehicle frame 2, the change in angle Θ of the saddle-type vehicle 1 is small.

[0212] <7. Pivot Range of Motion> Figure 6 is a side view of the pivot axis P in the saddle-type vehicle 1 of this embodiment. Figure 6 shows pivot axes Pa, Pb, and Pc as pivot axes P.

[0213] In the following, the range of motion of the pivot axis P is referred to as the pivot range of motion G. The pivot range of motion G is a portion of the circumference centered on the first axis A1. In other words, the pivot range of motion G is an arc centered on the first axis A1. By rotating the pivot axis P around the first axis A1 relative to the vehicle frame 2, the pivot axis P moves within the pivot range of motion G.

[0214] The pivot axes Pa, Pb, and Pc are each located on the pivot range of motion G.

[0215] The pivot range of motion G is limited to, for example, the area in front of the first axis A1. In other words, the entire pivot range of motion G is located in the area in front of the first axis A1.

[0216] The pivot axes Pa, Pb, and Pc are each located forward of the first axle A1 when viewed from the side of the vehicle.

[0217] The pivot range of motion G extends from a position above the imaginary line Q to a position below the imaginary line Q in a side view of the vehicle. As described above, the imaginary line Q is the imaginary line connecting the axis d of the drive axis D and the axis a1 of the first axis A1 in a side view of the vehicle.

[0218] The pivot axis Pa is located below the virtual line Q in a side view of the vehicle. The pivot axis Pc is located above the virtual line Q in a side view of the vehicle.

[0219] Figure 6 shows the first length Gz and the second length Gx. The first length Gz is the length of the pivot range of motion G in the vertical direction Z. The first length PA1 corresponds to the upper limit of the amount of the first movement Mz of the pivot axis P. The second length Gx is the length of the pivot range of motion G in the longitudinal direction X. The second length PA2 corresponds to the upper limit of the amount of the second movement Mx of the pivot axis P. The second length Gx is shorter than the first length Gz.

[0220] For example, pivot axis Pa is the lower end of the pivot range of motion G. Pivot axis Pc is the upper end of the pivot range of motion G. The first length Gz corresponds to the distance between pivot axis Pa and pivot axis Pc in the vertical direction Z.

[0221] The rotation of the pivot axis P relative to the vehicle frame 2 around the first axis A1 is decomposed into a first movement Mz and a second movement Mx of the pivot axis P. The first movement Mz is the movement of the pivot axis P relative to the vehicle frame 2 in the vertical direction Z. The second movement Mx is the movement of the pivot axis P relative to the vehicle frame 2 in the longitudinal direction X.

[0222] As described above, the first length Gz is longer than the second length Gx. Therefore, it is easy to increase the amount of the first movement Mz. For example, it is easy to make the amount of the first movement Mz greater than the amount of the second movement Mx. Thus, when the rear axle R moves relative to the vehicle frame 2, it is easy to reduce the change in the angle Θ of the rear arm 9.

[0223] As mentioned above, the second length Gx is shorter than the first length Gz. Therefore, it is easy to reduce the amount of the second movement Mx. For example, it is easy to make the amount of the second movement Mx smaller than the amount of the first movement Mz. Therefore, when the rear axle R moves relative to the vehicle frame 2, it is easy to suppress the amount of the second movement Mx.

[0224] Figure 6 shows the sixth axis 37. Figure 6 shows the sixth axes 37a, 37b, and 37c as the sixth axis 37.

[0225] Hereinafter, the range within which the sixth axis 37 can move is referred to as the sixth axis movable range H. The sixth axis movable range H is a part on the circumference centered on the first axis A1. In other words, the sixth axis movable range H is an arc centered on the first axis A1. When the sixth axis 37 rotates around the first axis A1 with respect to the vehicle body frame 2, the sixth axis 37 moves within the sixth axis movable range H.

[0226] The sixth axes 37a, 37b, and 37c are each located on the sixth axis movable range H.

[0227] The sixth axis movable range H is similar to the pivot movable range G. The sixth axis movable range H is smaller than the pivot movable range G. The radius of the sixth axis movable range H is smaller than the radius of the pivot movable range G.

[0228] The sixth axis movable range H is limited to the area in front of the first axis A1. In other words, all of the sixth axis movable range H is arranged in the area in front of the first axis A1.

[0229] The sixth axes 37a, 37b, and 37c are each located in front of the first axis A1 in a side view of the vehicle.

[0230] The sixth axis movable range H extends from a position above the virtual line Q to a position below the virtual line Q in a side view of the vehicle.

[0231] The sixth axis 37a is located below the virtual line Q in a side view of the vehicle. The sixth axis 37c is located above the virtual line Q in a side view of the vehicle.

[0232] For example, the sixth axis 37a is the lower end of the sixth axis movable range H. The sixth axis 37c is the upper end of the sixth axis movable range H.

[0233] The sixth axis movable range H is arranged behind the pivot movable range G.

[0234] The pivot range of motion G is located forward of the first axis A1 and forward of the sixth axis range of motion H.

[0235] The pivot range of motion G is limited to the area in front of the front end of the sixth axis range of motion H. In other words, the pivot range of motion G is positioned entirely in front of the sixth axis range of motion H.

[0236] The pivot range of motion G does not include anything behind the front end of the sixth axis range of motion H. Therefore, it is easy to reduce the amount of the second movement Mx of the pivot axis P.

[0237] Figure 7 is a side view of the drive shaft D, first shaft A1, pivot shaft P, and rear axle R in the saddle-type vehicle 1 of the embodiment. In Figure 7, the pivot shaft P is shown as pivot shafts Pa, Pb, and Pc. In Figure 7, the rear axle R is shown as rear axle Ra, Rb, and Rc.

[0238] Figure 7 shows the fifth distance E5. The fifth distance E5 is the distance between the drive axle D and the rear axle R in a side view of the vehicle. For example, the fifth distance E5 is the distance between the axis d of the drive axle D and the axis r of the rear axle R in a side view of the vehicle.

[0239] Although Figure 7 omits the illustration of the drive mechanism 12, the fifth distance E5 corresponds to the length of the drive mechanism 12.

[0240] The fifth distance E5 corresponds to "the distance between the drive shaft and the rear axle" in this invention.

[0241] When the rear axle R moves relative to the vehicle frame 2, the fifth distance E5 changes.

[0242] The fifth distance E5 when rear axle R is rear axle Ra is called "fifth distance E5a". The fifth distance E5 when rear axle R is rear axle Rb is called "fifth distance E5b". The fifth distance E5 when rear axle R is rear axle Rc is called "fifth distance E5c".

[0243] The fifth distance E5a is the fifth distance E5 when the rear axle R is located below the imaginary line Q in a side view of the vehicle. The fifth distance E5b is the fifth distance E5 when the rear axle R is located on the imaginary line Q in a side view of the vehicle. The fifth distance E5c is the fifth distance E5 when the rear axle R is located above the imaginary line Q in a side view of the vehicle.

[0244] When the pivot axis P moves relative to the vehicle frame 2, the fifth distance E5 changes.

[0245] The fifth distance E5a is the fifth distance E5 when the pivot axis P is the pivot axis Pa. The fifth distance E5b is the fifth distance E5 when the pivot axis P is the pivot axis Pb. The fifth distance E5c is the fifth distance E5 when the pivot axis P is the pivot axis Pc.

[0246] The fifth distance E5a is the fifth distance E5 when the pivot axis P is located below the imaginary line Q in a side view of the vehicle. The fifth distance E5b is the fifth distance E5 when the pivot axis P is located on the imaginary line Q in a side view of the vehicle. The fifth distance E5c is the fifth distance E5 when the pivot axis P is located above the imaginary line Q in a side view of the vehicle.

[0247] The fifth distance E5a is the fifth distance E5 when the pivot axis P and rear axle R are located below the imaginary line Q in a side view of the vehicle. The fifth distance E5b is the fifth distance E5 when the pivot axis P and rear axle R are located on the imaginary line Q in a side view of the vehicle. The fifth distance E5c is the fifth distance E5 when the pivot axis P and rear axle R are located above the imaginary line Q in a side view of the vehicle.

[0248] As described above, when the rear axle R moves relative to the vehicle frame 2, the amount of the second movement Mx is small. Therefore, when the rear axle R moves relative to the vehicle frame 2, the change in the fifth distance E5 is small. For example, the difference between the fifth distance E5a and the fifth distance E5b is small. For example, the difference between the fifth distance E5b and the fifth distance E5c is small. Thus, in the saddle-type vehicle 1, the chain 13 is not prone to bending. For example, the chain 13 is not prone to sagging even without using a mechanism to adjust the tension of the chain 42. Even when the pivot axis P moves relative to the vehicle frame 2, the chain 13 remains taut without using a mechanism to adjust the tension of the chain 13. Therefore, the drive mechanism 12 has a simple structure.

[0249] The fifth distance E5b is shorter than the fifth distance E5a.

[0250] The fifth distance E5b is shorter than the fifth distance E5c.

[0251] Of the fifth distances E5a, E5b, and E5c, the fifth distance E5b is the shortest. Therefore, when the pivot axis P is located above or below the imaginary line Q in a side view of the vehicle, the chain 13 is less likely to loosen. When the pivot axis P and the rear axle R are located above or below the imaginary line Q in a side view of the vehicle, respectively, the chain 13 is less likely to loosen.

[0252] For example, the chain 13 is tensioned such that it has appropriate tension when the fifth distance E5 is equal to the fifth distance E5b. Therefore, the chain 13 is less likely to loosen when the pivot axis P is located on the imaginary line Q in a side view of the vehicle. The chain 13 is less likely to loosen when the pivot axis P and the rear axle R are located on the imaginary line Q in a side view of the vehicle.

[0253] FIG. 8 is a side view of the drive shaft D, the pivot shaft P, and the rear axle R in the straddle-type vehicle 100 of the comparative example. As described above, the straddle-type vehicle 100 of the comparative example includes a vehicle body frame (not shown). The straddle-type vehicle 100 includes a drive shaft D, a pivot shaft P, and a rear axle R. In the straddle-type vehicle 100, the position of the drive shaft D does not change with respect to the vehicle body frame. In the straddle-type vehicle 100, the position of the pivot shaft P does not change with respect to the vehicle body frame. In the straddle-type vehicle 100, the position of the rear axle R changes with respect to the vehicle body frame. In the straddle-type vehicle 100, the rear axle R rotates around the pivot shaft P with respect to the vehicle body frame.

[0254] FIG. 8 shows rear axles Rd, Re, and Rf as the rear axle R. The rear axle Re is higher than the rear axle Rd. The rear axle Rf is higher than the rear axle Re.

[0255] FIG. 8 shows the fifth distance E5. The fifth distance E5 is the distance between the drive shaft D and the rear axle R in a side view of the vehicle.

[0256] In the straddle-type vehicle 100, when the rear axle R moves with respect to the vehicle body frame 2, the fifth distance E5 changes.

[0257] The fifth distance E5 when the rear axle R is the rear axle Rd is referred to as the "fifth distance E5d". The fifth distance E5 when the rear axle R is the rear axle Re is referred to as the "fifth distance E5e". The fifth distance E5 when the rear axle R is the rear axle Rf is referred to as the "fifth distance E5f".

[0258] As described above, in the straddle-type vehicle 1, when the rear axle R moves with respect to the vehicle body frame 2, the amount of the second movement Mx is small. Therefore, when the rear axle R moves with respect to the vehicle body frame 2, the amount of change in the fifth distance E5 of the straddle-type vehicle 1 is smaller than the amount of change in the fifth distance E5 of the straddle-type vehicle 100. For example, the difference between the fifth distance E5a and the fifth distance E5b is smaller than the difference between the fifth distance Ed and the fifth distance Ee. For example, the difference between the fifth distance E5b and the fifth distance E5c is smaller than the difference between the fifth distance Ee and the fifth distance Ef.

[0259] The fifth distance, E5e, is longer than the fifth distance, Ed.

[0260] The fifth distance, E5e, is shorter than the fifth distance, Ef.

[0261] Of the five fifth distances Ed, Ee, and Ef, the fifth fifth distance E5e is the longest.

[0262] <8. Effects of the Embodiment> As described above, according to this embodiment, the saddle-type vehicle 1 comprises a vehicle frame 2, a first axle A1, a rotating member 19, a pivot shaft P, a rear arm 9, a rear axle R, a rear wheel 11, and a coupling mechanism 18. The first axle A1 is supported by the vehicle frame 2. The first axle A1 extends in the width direction Y. The rotating member 19 is supported by the first axle A1. The rotating member 19 is configured to rotate around the first axle A1 relative to the vehicle frame 2. The pivot shaft P is supported by the rotating member 19. The pivot shaft P extends in the width direction Y. The rear arm 9 is supported by the pivot shaft P. The rear arm 9 is configured to rotate around the pivot shaft P relative to the rotating member 19. The rear axle R is supported by the rear arm 9. The rear axle R extends in the width direction Y. The rear wheel 11 is supported by the rear axle R. The coupling mechanism 18 is connected to the vehicle frame 2, the rotating member 19, and the rear arm 9.

[0263] Therefore, when the rear axle R moves relative to the vehicle frame 2, the rear arm 9 rotates around the pivot axis P relative to the rotating member 19, and the coupling mechanism 18 rotates the rotating member 19 around the first axis A1 relative to the vehicle frame 2. When the rotating member 19 rotates around the first axis A1 relative to the vehicle frame 2, the pivot axis P rotates around the first axis A1 relative to the vehicle frame 2. In summary, when the rear axle R moves relative to the vehicle frame 2, the pivot axis P moves relative to the vehicle frame 2. Therefore, it is easy to minimize the change in the angle Θ of the rear arm 2.

[0264] In a side view of the vehicle, the first distance E1 is 50 mm or more. The first distance E1 is the distance between the axis a1 of the first axle A1 and the axis p of the pivot axis P. Thus, the first distance E1 is relatively large. For this reason, even when the pivot axis P moves relative to the vehicle frame 2, it is easy to reduce the amount of the second movement Mx of the pivot axis P. Therefore, it is easy to transmit power from the drive axle D to the rear wheels 11.

[0265] In summary, in the saddle-type vehicle 1, it is easy to reduce the change in the angle Θ of the rear arm 9. Furthermore, in the saddle-type vehicle 1, it is easy to reduce the amount of the second movement Mx of the pivot axis P.

[0266] The angle Θ of the rear arm 9 is, for example, the angle between the axis J of the rear arm 9 and the reference line K in a side view of the vehicle. The axis J of the rear arm is a virtual line connecting the axis p of the pivot axis P and the axis r of the rear axle R in a side view of the vehicle. The reference line K is, for example, parallel to the vertical direction Z.

[0267] The second movement Mx of the pivot axis P is the movement of the pivot axis P relative to the vehicle frame 2 in the longitudinal direction X.

[0268] In a side view of the vehicle, the first axle A1 overlaps with the vehicle frame 2. Therefore, it is easy for the vehicle frame 2 to support the first axle A1.

[0269] In a side view of the vehicle, the pivot axis P does not overlap with the vehicle frame 2. Therefore, it is easy to make the first distance E1 50 mm or more.

[0270] The first axle A1 is positioned behind the pivot axis P in a side view of the vehicle. The first axle A1 is positioned in front of the rear axle R in a side view of the vehicle. Therefore, the first axle A1 is positioned appropriately with respect to the pivot axis P. The first axle A1 is positioned appropriately with respect to the rear axle R. Therefore, the pivot axis P is positioned appropriately with respect to the rear axle R.

[0271] The pivot range of motion G is limited to the area in front of the first axis A1. The pivot range of motion G is the range in which the pivot axis P can move. In other words, the entirety of the pivot range of motion G is located in the area in front of the first axis A1. Therefore, it is easy to reduce the amount of the second movement Mx of the pivot axis P.

[0272] The drive axis D is positioned in front of the pivot axis P. The pivot range of motion G extends from a position above the imaginary line Q to a position below the imaginary line Q in a side view of the vehicle. The imaginary line Q is the imaginary line connecting the drive axis D and the first axis A1. Therefore, it is easy to increase the amount of the first movement Mz of the pivot axis P. Thus, it is easy to reduce the change in the angle Θ of the rear arm 9.

[0273] The fifth distance E5b is shorter than the fifth distances E5a and E5c. The fifth distance E5a is the fifth distance E5 when the pivot axis P is located below the imaginary line Q in a side view of the vehicle. The fifth distance E5b is the fifth distance E5 when the pivot axis P is located on the imaginary line Q in a side view of the vehicle. The fifth distance E5c is the fifth distance E5 when the pivot axis P is located above the imaginary line Q in a side view of the vehicle. The fifth distance E5 is the distance between the drive axis D and the rear axle R in a side view of the vehicle. Therefore, even when the pivot axis P is located above or below the imaginary line Q in a side view of the vehicle, it is easy to transmit power from the drive axis D to the rear wheels 11.

[0274] As mentioned above, the fifth distance 5b is shorter than the fifth distance 5a. Here, the fifth distance E5b is the fifth distance E5 when the pivot axis P and the rear axle R are located on the imaginary line Q in a side view of the vehicle. The fifth distance Ea is the fifth distance E5 when the pivot axis P and the rear axle R are both located below the imaginary line Q in a side view of the vehicle. Therefore, even when the pivot axis P and the drive axis D are located below the imaginary line Q in a side view of the vehicle, it is easy to transmit power from the drive axis D to the rear wheels 11.

[0275] As mentioned above, the fifth distance E5b is shorter than the fifth distance 5c. Here, the fifth distance E5b is the fifth distance E5 when the pivot axis P and the rear axle R are located on the imaginary line Q in a side view of the vehicle. The fifth distance Ec is the fifth distance E5 when the pivot axis P and the rear axle R are both located above the imaginary line Q in a side view of the vehicle. Therefore, even when the pivot axis P and the drive axis D are located above the imaginary line Q in a side view of the vehicle, it is easy to transmit power from the drive axis D to the rear wheels 11.

[0276] The second length PA2 is shorter than the first length PA1. The first length PA1 corresponds to the upper limit of the amount of the first movement Mz of the pivot axis P. The second length PA2 corresponds to the upper limit of the amount of the second movement Mx of the pivot axis P. Therefore, it is easy to increase the amount of the first movement Mz of the pivot axis P. Thus, it is easy to reduce the change in the angle Θ of the rear arm P. Furthermore, it is easy to reduce the amount of the second movement Mx of the pivot axis P.

[0277] The rotating member 9 has an arm shape when viewed from the side of the vehicle. The arm shape extends from the first axis A1 to the pivot axis P. Therefore, the rotating member 9 does not have a disc shape centered on the first axis A1. Thus, it is easy to reduce the size of the rotating member 19.

[0278] The rotating member 19 has a front end 19A and a rear end 19B. The front end 19A supports the pivot axis P. The rear end 19B is supported by the first axis A1. Therefore, it is easy to reduce the size of the rotating member 19.

[0279] The second distance E2 is equivalent to or less than 15 times the first distance E1. The second distance E2 is the distance between the axis p of the pivot axis P and the axis r of the rear axle R in a side view of the saddle-type vehicle. Therefore, even when the second distance E1 is relatively short, it is easy to minimize the change in the angle Θ of the rear arm 9.

[0280] The second distance E2 is 750mm or less. Therefore, even if the second distance Ed2 is 750mm or less, it is easy to minimize the change in the angle Θ of the rear arm 9.

[0281] When the rear arm 9 moves relative to the vehicle frame 2, the coupling mechanism 18 rotates the rotating member 19 around the first axis A1 relative to the vehicle frame 2. When the rear arm 9 moves relative to the vehicle frame 2, the rear axle R moves relative to the vehicle frame 2. When the coupling mechanism 18 rotates the rotating member 19 around the first axis A1 relative to the vehicle frame 2, the pivot axis P moves relative to the vehicle frame 2. Therefore, it is easy for the pivot axis P to move relative to the vehicle frame 2 when the rear axle R moves relative to the vehicle frame 2. Thus, it is easy to minimize the change in the angle Θ of the rear arm 9.

[0282] When the rear axle R moves upward relative to the vehicle frame 2, the coupling mechanism 18 moves the pivot axis P upward relative to the vehicle frame 2. When the rear axle R moves downward relative to the vehicle frame 2, the coupling mechanism 18 moves the pivot axis P downward relative to the vehicle frame 2. Therefore, it is easy to minimize the change in the angle Θ of the rear arm 9 when the rear axle R moves upward relative to the vehicle frame 2. Also, it is easy to minimize the change in the angle Θ of the rear arm 9 when the rear axle R moves downward relative to the vehicle frame 2.

[0283] When viewed from the left side of the vehicle, if the rear axle R rotates clockwise around the pivot axis P, the pivot axis P rotates counterclockwise around the first axis A1. When viewed from the left side of the vehicle, if the rear axle R rotates counterclockwise around the pivot axis P, the pivot axis P rotates clockwise around the first axis A1. In other words, the pivot axis P rotates in the opposite direction to the rear axle R. For this reason, it is easy to minimize the change in the angle Θ of the rear arm 9.

[0284] The coupling mechanism 18 comprises a second shaft 31, a first link member 32, a third shaft 33, a fourth shaft 34, a second link member 35, a fifth shaft 36, a sixth shaft 37, and a third link member 38. The second shaft 31 is supported by the vehicle frame 2 (2A) and extends in the width direction Y. The first link member 32 is connected to the second shaft 31. The third shaft 33 is supported by the first link member 32 and extends in the width direction Y. The fourth shaft 34 is supported by the rear arm 9 and extends in the width direction Y. The second link member 38 is connected to the third shaft 33 and the fourth shaft 34. The fifth shaft 36 is supported by the first link member 32 and extends in the width direction Y. The sixth shaft 37 is supported by the rotating member 19 and extends in the width direction Y. The third link member 38 is connected to the fifth shaft 36 and the sixth shaft 37.

[0285] When the rear axle R moves relative to the vehicle frame 2, the rear arm 9 and the fourth axle 34 move relative to the vehicle frame 2. When the fourth axle 34 moves relative to the vehicle frame 2, the second link member 35 moves relative to the vehicle frame 2. When the second link member 35 moves relative to the vehicle frame 2, the third axle 33, the first link member 32, and the fifth axle 36 rotate around the second axle 33 relative to the vehicle frame 2. When the fifth axle 36 rotates around the second axle 32 relative to the vehicle frame 2, the third link member 38 moves relative to the vehicle frame 2. When the third link member 38 moves relative to the vehicle frame 2, the sixth axle 37, the rotating member 19, and the pivot axis P rotate around the first axle A1 relative to the vehicle frame 2. In summary, when the rear axle R moves relative to the vehicle frame 2, it is easy for the coupling mechanism 18 to move the pivot axis P relative to the vehicle frame 2.

[0286] The first link member 32 is configured to rotate around the second axis 31 relative to the vehicle frame 2. The second link member 35 is configured to rotate around the third axis 33 relative to the first link member 32. The second link member 35 is configured to rotate around the fourth axis 34 relative to the rear arm 9. The third link member 38 is configured to rotate around the fifth axis 36 relative to the first link member 32. The third link member 38 is configured to rotate around the sixth axis 37 relative to the rotating member 19.

[0287] Therefore, when the rear axle R moves relative to the vehicle frame 2, it is even easier for the coupling mechanism 18 to rotate the rotating member 19 around the first axle A1 relative to the vehicle frame 2. Thus, when the rear axle R moves relative to the vehicle frame 2, it is even easier for the coupling mechanism 18 to rotate the pivot axis P around the first axle A1 relative to the vehicle frame 2.

[0288] The rear axle R is positioned behind the pivot axis P. The fourth axle 34 is positioned behind the pivot axis P. The third axle 33 is positioned behind the second axle 31. The fifth axle 36 is positioned behind the second axle 31. The sixth axle 37 is positioned in front of the first axle A1. The pivot axis P is positioned in front of the first axle A1.

[0289] The movement of the rear axle R and the fourth axle 34 will now be described. The rear axle R is positioned behind the pivot axis P. The fourth axle 34 is also positioned behind the pivot axis P. The rear axle R and the fourth axle 34 are connected by a rear arm 9. The rear arm 9 is configured to rotate around the pivot axis P. Therefore, when the rear axle R moves upward, the fourth axle 34 moves upward. When the rear axle R moves downward, the fourth axle 34 moves downward.

[0290] The movement of the fourth shaft 34 and the third shaft 33 will now be described. The fourth shaft 34 and the third shaft 33 are connected by the second link member 35. Therefore, when the fourth shaft 34 moves upward, the third shaft 33 moves upward. When the fourth shaft 34 moves downward, the third shaft 33 moves downward.

[0291] The movement of the third axis 33 and the fifth axis 36 will now be described. The third axis 33 is positioned behind the second axis 31. The fifth axis 36 is also positioned behind the second axis 31. The third axis 33 and the fifth axis 36 are connected by a first link member 32. The first link member 32 is configured to rotate around the second axis 31. Therefore, when the third axis 33 moves upward, the fifth axis 36 moves upward. When the third axis 33 moves downward, the fifth axis 36 moves downward.

[0292] The movement of the fifth axis 36 and the sixth axis 37 will now be described. The fifth axis 36 and the sixth axis 37 are connected by the third link member 38. Therefore, when the fifth axis 36 moves upward, the sixth axis 37 moves upward. When the fifth axis 36 moves downward, the sixth axis 37 moves downward.

[0293] The movement of the sixth axis 37 and the pivot axis P will now be described. The sixth axis 37 is positioned in front of the first axis A1. The pivot axis P is also positioned in front of the first axis A1. The sixth axis 37 and the pivot axis P are connected by a rotating member 19. The rotating member 19 is configured to rotate around the first axis A1. Therefore, when the sixth axis 37 moves upward, the pivot axis P moves upward. When the sixth axis 37 moves downward, the pivot axis P moves downward.

[0294] In summary, when the rear axle R moves upward, the pivot axis P moves upward. When the rear axle R moves downward, the pivot axis P moves downward. Therefore, it is easy to minimize the change in the angle Θ of the rear arm 9.

[0295] C13 (3rd distance (pivot axis - 6th axis) < 4th distance (6th axis - 1st axis)) The third distance E3 is shorter than the fourth distance E4. The third distance E3 is the distance between the axis p of the pivot axis P and the axis 37z of the sixth axle 37 in a side view of the vehicle. The fourth distance E4 is the distance between the axis 37z of the sixth axle 37 and the axis a1 of the first axle A1 in a side view of the vehicle. Therefore, when the coupling mechanism 18 rotates the rotating member 19 around the first axle A1 relative to the vehicle frame 2, the load on the coupling mechanism 18 is relatively small. Thus, it is easy for the coupling mechanism 18 to rotate the rotating member 19 around the first axle A1 relative to the vehicle frame 2. Consequently, it is easy for the coupling mechanism 18 to rotate the pivot axis P around the first axle A1 relative to the vehicle frame 2.

[0296] The fourth distance, E4, is longer than half the length of the first distance, E1. As described above, the fourth distance E4 is the distance between the axis 37z of the sixth axle 37 and the axis a1 of the first axle A1 in a side view of the vehicle. Therefore, when the coupling mechanism 18 rotates the rotating member 19 around the first axle A1 relative to the vehicle frame 2, the load on the coupling mechanism 18 is relatively small. Therefore, it is easy for the coupling mechanism 18 to rotate the rotating member 19 around the first axis A1 relative to the vehicle frame 2. Consequently, it is easy for the coupling mechanism 18 to rotate the pivot axis P around the first axis A1 relative to the vehicle frame 2.

[0297] The sixth axis 37 is positioned behind the pivot axis P. The sixth axis 37 is positioned in front of the first axis A1. Therefore, it is easy to reduce the size of the rotating member 19.

[0298] The range of motion of the sixth axis H is limited to the area in front of the first axis A1. The range of motion of the sixth axis H is the range in which the sixth axis 37 can move. Therefore, it is easy to limit the pivot range of motion G to the area in front of the first axis A1. Thus, it is easy to further reduce the amount of the second movement Mx of the pivot axis P.

[0299] The saddle-type vehicle 1 is equipped with a rear suspension 15. The rear suspension 15 is connected to the vehicle frame 2 and the rear arm 9. As described above, it is easy to reduce the change in the angle Θ of the rear arm 9. Therefore, it is easy to adjust the rear suspension 15. For example, it is easy to improve the ride comfort of the saddle-type vehicle 1 by adjusting the settings of the rear suspension 15.

[0300] The rear suspension 15 is connected to the rear arm 9 via a connecting mechanism 18. Therefore, connecting the rear suspension 15 to the rear arm 9 is easy.

[0301] The rear suspension 15 is connected to the rear arm 9 via the first link member 32. Therefore, connecting the rear suspension 15 to the rear arm 9 is easy.

[0302] The saddle-type vehicle 1 comprises a seventh axle 39 and an eighth axle 40. The seventh axle 39 is supported by the vehicle frame 2 and extends in the width direction Y. The eighth axle 40 is supported by the first link member 32 and extends in the width direction Y. The rear suspension 15 is connected to the seventh axle 39 and the eighth axle 40. Therefore, it is easy to connect the rear suspension 15 to the vehicle frame 2 and the rear arm 9.

[0303] The saddle-type vehicle 1 comprises a drive shaft D and a drive mechanism 12. The drive shaft D outputs power. The drive mechanism 12 is connected to the drive shaft D and the rear wheels 11. The drive mechanism 12 is configured to transmit power from the drive shaft D to the rear wheels 11. Therefore, it is easy to rotate the rear wheels 11 around the rear axle R.

[0304] The drive shaft D is positioned in front of the pivot shaft P. As mentioned above, the first distance E1 is 50 mm or more. Therefore, it is easy to reduce the amount of the second movement Mx of the pivot shaft P. Thus, it is easy to reduce the change in the fifth distance E5. Consequently, it is easy for the drive mechanism 12 to transmit power from the drive shaft D to the rear wheel 11.

[0305] The drive mechanism 12 includes a chain 13. The chain 13 is connected to the drive shaft D and the rear axle R. The saddle-type vehicle 1 does not have a mechanism for adjusting the tension of the chain 13. Therefore, the drive mechanism 12 has a simple structure.

[0306] In the saddle-type vehicle 1, the chain 13 remains taut even when the pivot axis P moves relative to the vehicle frame 2, without the need for a mechanism to adjust the tension of the chain 13. In other words, the chain 13 is less likely to slacken even without a mechanism to adjust the tension of the chain 13. For this reason, the drive mechanism 12 does not need to be equipped with a mechanism to adjust the tension of the chain 13.

[0307] The movement of the coupling mechanism 18 is independent of changes in the tension of the chain 13. In other words, in the saddle-type vehicle 1, the movement of the pivot axis P relative to the vehicle frame 2 is independent of changes in the tension of the chain 13. For this reason, it is easy to simplify the structure of the coupling mechanism 18.

[0308] <9. Modified Embodiments> This invention is not limited to the embodiments described above, and can be modified and implemented as follows.

[0309] (1) In the embodiment, the first distance E1 was 50 mm or more. However, the first distance E1 is not limited to this. The first distance E1 may be 100 mm or more. Therefore, it is even easier to reduce the amount of the second movement Mx of the pivot axis P.

[0310] (2) The pivot range of motion G may extend from a position higher than the first axis A1 to a position lower than the first axis A1 in a side view of the vehicle. For this reason, it is easy to increase the amount of the first movement Mz of the pivot axis P.

[0311] Alternatively, the pivot range of motion G does not need to extend to a position lower than the first axle A1 in a side view of the vehicle. The pivot range of motion G may be limited to a position higher than the first axle A1 in a side view of the vehicle. The entire pivot range of motion G may be higher than the first axle A1 in a side view of the vehicle.

[0312] (3) A portion of the pivot range of motion G may overlap with the range of motion H of the sixth axis in the front-to-back direction X. A portion of the pivot range of motion G may overlap with a portion of the range of motion H of the sixth axis in the front-to-back direction X. Even if a portion of the pivot range of motion G overlaps with the range of motion H of the sixth axis, it is easy to reduce the amount of the second movement Mx.

[0313] (4) In the embodiment, the second distance E2 was equivalent to or less than 15 times the first distance E1. However, the second distance E2 is not limited to this. For example, when the first distance E1 is 100 mm or more, the second distance E may be equivalent to or less than 5 times the first distance E1. For example, when the first distance Ed1 is 100 mm or more, the second distance Ed2 is 5 times or less the length of the first distance Ed1. When the first distance Ed1 is 100 mm or more, the second distance Ed2 is 4 times or less the length of the first distance Ed1. When the first distance Ed1 is 100 mm or more, the second distance Ed2 is 3 times or less the length of the first distance Ed1. When the first distance Ed1 is 100 mm or more, the second distance Ed2 is 2 times or less the length of the first distance Ed1. Therefore, even when the second distance E2 is even shorter, it is easy to reduce the change in the angle Θ of the rear arm 9.

[0314] (5) In the embodiment, the pivot axis P did not overlap with the vehicle body frame 2 in a view of the left side of the vehicle. However, the pivot axis P may overlap with the vehicle body frame 2 in a view of the side of the vehicle. In this case, the pivot axis P may be positioned inward of the vehicle body frame 2 in the width direction Y.

[0315] (6) In this embodiment, the rotating member 19 extends forward from the first axis A1. However, the rotating member 19 may also extend backward from the first axis A1.

[0316] (7) In the embodiment, the rotating member 19 was in the shape of a linearly extending arm or a rod-shaped arm. However, the shape of the rotating member 19 is not limited to these. For example, the rotating member 19 may be fan-shaped. The rotating member 19 may be semicircular. The rotating member 19 may be a bent arm shape.

[0317] (8) In the embodiment, the drive shaft D, pivot shaft Pb, first shaft A1, and rear axle Rb were aligned in a straight line when viewed from the side of the vehicle. However, in a side view of the vehicle, it is not necessary for one of the drive shaft D, pivot shaft Pb, first shaft A1, and rear axle Rb to be aligned in a straight line. In a side view of the vehicle, it is not necessary for two of the drive shaft D, pivot shaft Pb, first shaft A1, and rear axle Rb to be aligned in a straight line.

[0318] (9) In the embodiment, the first link member 32 was substantially triangular in shape. However, the shape of the first link member 32 is not limited to this. The first link member 32 may be V-shaped, U-shaped, substantially square, or the like.

[0319] (10) In the embodiment, the second link member 35 and the third link member 38 were in the shape of a linearly extending arm or a rod-shaped arm. However, the shape of the second link member 35 and the third link member 38 is not limited to these.

[0320] (11) In the embodiment, the rear arm 9 was triangular in a side view of the vehicle. However, the shape of the rear arm 9 is not limited to this. The rear arm 9 may be straight or curved. (12) In one embodiment, the drive mechanism 12 included a chain 13. However, the drive mechanism 12 is not limited to this. The drive mechanism 12 may include at least one of a chain, a belt, and a drive shaft. For example, the drive mechanism 12 may transmit power from the drive shaft D to the rear wheel 11 by at least one of a chain, a belt, and a drive shaft. The drive mechanism 12 may also be a so-called shaft drive system. In a shaft drive system, the drive shaft does not include a chain 13 and drives the rear wheel 11 by a drive shaft.

[0321] (13) In the embodiment, the angle Θ of the rear arm 9 was the angle between the axis J of the rear arm 9 and the reference line K. The reference line K was parallel to the vertical direction Z. However, the reference line K is not limited to this. For example, the reference line K may be horizontal. The reference line K may be defined by the vehicle body frame 2. The reference line K may be defined by the main frame 6. The reference line K may be defined by at least one of the drive shaft D, the first shaft A1 and the second shaft 31. Alternatively, the reference line K may be defined by the road surface in contact with the rear wheel 11.

[0322] (14) In this embodiment, there was one front wheel 8. However, it is not limited to this. There may be two front wheels 8. In this embodiment, there was one rear wheel 11. However, it is not limited to this. There may be two rear wheels 11.

[0323] (15) In this embodiment, a sports-type vehicle is given as an example of a saddle-type vehicle 1. However, it is not limited to this. For example, the saddle-type vehicle 1 may be changed to other types of vehicles such as a street type, a scooter type, an off-road type, or an all-terrain vehicle.

[0324] (16) The embodiments and each modified embodiment described in (1) to (15) above may be further modified as appropriate by substituting or combining each configuration with the configuration of other modified embodiments. [Explanation of Symbols]

[0325] 1: Saddle-type vehicle 2: Vehicle frame 3: Steering system 4: Handle 5: Sheet 5: Front suspension 6: Mainframe 8: Front wheel 9: Rear Arm 10: Engine 11: Rear wheel 12: Drive mechanism 13: Chain 14: Fuel tank 15: Rear suspension 18:Connection mechanism 19: Rotating member 19A: Front end 19B: Rear end 31: 2nd axis 32: First link member 33, 33a, 33b, 33c: 3rd axis 34, 34a, 34b, 34c: 4th axis 35: Second link member 36, 36a, 36b, 36c: 5th axis 37, 37a, 37b, 37c: 6th axis 37z: Axis of the 6th axis 38: Third link member 39: 7th axis 40: 8th axis A1: First axis a1 :Axis line D: Drive axis d: Axis line DS: Drive sprocket E1: 1st distance E2: 2nd distance E3: Third distance E4: 4th distance E5: 5th distance F: Front axle G: Pivot range of motion H: 6th axis range of motion J, Ja, Jb, Jc: Axis of the rear arm K:Reference line P: Pivot axis Pa,Pb,Pc:Position p: Axis of the pivot axis Q: What is the imaginary line connecting drive axis D and the first axle in a side view of the vehicle? R, Ra, Rb, Rc: Rear axle r :Axis line RS: Rear sprocket

Claims

1. It is a saddle-type vehicle, The vehicle frame and Supported by the vehicle body frame, the first axle extends in the width direction of the saddle-type vehicle, A rotating member supported by the first axle and configured to rotate about the first axle relative to the vehicle body frame, Supported by the rotating member, the pivot shaft extends in the width direction of the saddle-type vehicle, A rear arm is supported on the pivot axis and configured to rotate around the pivot axis relative to the rotating member, Supported by the rear arm, the rear axle extends in the width direction of the saddle-type vehicle, The rear wheel is supported by the aforementioned rear axle, The vehicle body frame, the rotating member, and the connecting mechanism connected to the rear arm, Equipped with, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the first axle and the axis of the pivot axis is defined as the first distance. The first distance is 50 mm or more. A saddle-type vehicle.

2. In the saddle-type vehicle described in claim 1, The range within which the pivot axis can move is defined as the pivot range of motion. The pivot range of motion is limited to the area forward of the first axis. A saddle-type vehicle.

3. In the saddle-type vehicle described in claim 2, Equipped with a drive shaft that outputs power, The drive shaft is positioned in front of the pivot shaft. The pivot range of motion extends from a position above the imaginary line connecting the drive shaft and the first shaft to a position below the imaginary line in a side view of the saddle-type vehicle. A saddle-type vehicle.

4. In the saddle-type vehicle described in claim 3, When the pivot axis is located on the virtual line in a side view of the saddle-type vehicle, the distance between the drive axis and the rear axle is shorter than the distance between the drive axis and the rear axle when the pivot axis is located above or below the virtual line in a side view of the saddle-type vehicle. A saddle-type vehicle.

5. In the saddle-type vehicle according to claim 2 or 3, The length of the pivot range of motion in the vertical direction of the aforementioned saddle-type vehicle is defined as the first length. The length of the pivot range of motion in the longitudinal direction of the aforementioned saddle-type vehicle is defined as the second length. The second length is shorter than the first length. A saddle-type vehicle.

6. In the saddle-type vehicle according to claim 1 or 2, The rotating member has an arm shape extending from the first axis to the pivot axis in a side view of the saddle-type vehicle. A saddle-type vehicle.

7. In the saddle-type vehicle according to claim 1 or 2, The aforementioned rotating member is The rear end supported by the first shaft, The front end supporting the pivot axis, has A saddle-type vehicle.

8. In the saddle-type vehicle according to claim 1 or 2, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the pivot axis and the axis of the rear axle is defined as the second distance. The second distance is equivalent to or smaller than 15 times the first distance. A saddle-type vehicle.

9. In the saddle-type vehicle described in claim 8, The second distance is 750 mm or less. A saddle-type vehicle.

10. In the saddle-type vehicle according to claim 1 or 2, When the rear axle moves upward relative to the vehicle frame, the coupling mechanism moves the pivot shaft upward relative to the vehicle frame. When the rear axle moves downward relative to the vehicle frame, the coupling mechanism moves the pivot shaft downward relative to the vehicle frame. A saddle-type vehicle.

11. In the saddle-type vehicle according to claim 1 or 2, In a left-side view of the aforementioned saddle-type vehicle, when the rear axle rotates clockwise around the pivot axis, the pivot axis rotates counterclockwise around the first axis. In a left-side view of the aforementioned saddle-type vehicle, when the rear axle rotates counterclockwise around the pivot axis, the pivot axis rotates clockwise around the first axis. A saddle-type vehicle.

12. In the saddle-type vehicle according to claim 1 or 2, The aforementioned coupling mechanism is A second axle is supported by the vehicle body frame and extends in the width direction of the saddle-type vehicle, A first link member connected to the second shaft, A third shaft is supported by the first link member and extends in the width direction of the saddle-type vehicle, A fourth axle is supported by the rear arm and extends in the width direction of the saddle-type vehicle, A second link member connected to the third and fourth axes, A fifth axle is supported by the first link member and extends in the width direction of the saddle-type vehicle, A sixth axle, supported by the rotating member and extending in the width direction of the saddle-type vehicle, A third link member connected to the fifth and sixth axes, Equipped with A saddle-type vehicle.

13. In the saddle-type vehicle described in claim 12, In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the pivot axis and the axis of the sixth axis is defined as the third distance. In a side view of the aforementioned saddle-type vehicle, the distance between the axis of the sixth axle and the axis of the first axle is defined as the fourth distance. The third distance is shorter than the fourth distance. A saddle-type vehicle.

14. In the saddle-type vehicle described in claim 12, The sixth axis is positioned behind the pivot axis and in front of the first axis. A saddle-type vehicle.

15. In the saddle-type vehicle described in claim 12, The range in which the sixth axis can move is defined as the range of motion of the sixth axis. The range of motion of the sixth axis is limited to the area in front of the first axis. A saddle-type vehicle.

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