JP6842912B2 - Saddle-type vehicle and yaw vibration suppression device - Google Patents

Description

The present invention relates to a technique for suppressing yaw vibration for a saddle-mounted vehicle.

Patent Document 1 discloses a configuration including a dynamic damper that absorbs vibration in the vehicle width direction input from the road surface to the front wheels or the rear wheels of a motorcycle.

Japanese Unexamined Patent Publication No. 2007-296874

However, the dynamic damper disclosed in Patent Document 1 absorbs vibration in the vehicle width direction propagated from the road surface to the vehicle body frame via the tires and front forks or the rear arm when the motorcycle is leaning and turning. It just does.

Therefore, an object of the present invention is to suppress the yaw vibration of the vehicle body for a saddle-mounted vehicle.

In order to solve the above problems, this saddle-mounted vehicle is a saddle-mounted vehicle in which front wheels and rear wheels are supported on a vehicle body, and a mass body and the mass body are used as a yaw axis of vibration in the yaw direction of the vehicle body. On the other hand, at a position separated along the front-rear direction of the vehicle body, a support portion that supports the vehicle body so as to be reciprocally movable along a movement path along the width direction of the vehicle body and a mass body at an intermediate position of the movement path. A yaw-direction vibration suppression device including an urging portion for urging toward is provided.

As a result, when the vehicle body of the saddle-mounted vehicle vibrates in the yaw direction, the mass body vibrates in response to the vibration in the yaw direction of the vehicle body, and thus the vibration in the yaw direction of the vehicle body can be absorbed and suppressed.

It is a side view which shows the whole structure of a motorcycle. It is sectional drawing which shows an example of the yaw direction vibration suppression apparatus embodied as an axle shaft. It is explanatory drawing which shows the assembly example of the yaw direction vibration suppression apparatus. It is sectional drawing which shows another example of the yaw direction vibration suppression apparatus embodied as an axle shaft. It is explanatory drawing which shows the assembly example of the yaw direction vibration suppression apparatus.

Hereinafter, the saddle-mounted vehicle and the yaw-direction vibration suppression device according to the embodiment will be described. In the following embodiment, an example in which the saddle-mounted vehicle is a motorcycle will be described. However, as a saddle-mounted vehicle to which this yaw-direction vibration suppression device can be applied, a motorcycle, a tricycle, or the like can be considered in addition to a motorcycle.

FIG. 1 is a side view showing the overall configuration of the motorcycle 10.

The motorcycle 10 includes a body frame 11, front wheels 20, rear wheels 22, a steering wheel device 38, and an engine 24. In the following description, when referring to up / down, front / back, and left / right, each direction is defined as follows. First, the side where the front wheels 20 and the rear wheels 22 of the motorcycle 10 come into contact with the road surface is the lower side, and the opposite side is the upper side. Further, when the motorcycle 10 travels, the traveling direction is the front, and the opposite side is the rear. Further, when the user is on the motorcycle 10 as a driver, the left and right sides based on the user are the left and right sides of the motorcycle 10.

The vehicle body frame 11 includes a head pipe 12, a main frame 13, and a rear frame 14.

The head pipe 12 is provided on the front side of the motorcycle 10. The main frame 13 extends rearward from the head pipe 12 while being separated to the left and right. The rear frame 14 extends rearward from the rear end of the main frame 13.

A steering shaft 16 is rotatably inserted into the head pipe 12. An upper bracket and an under bracket (both not shown) are supported on the steering shaft 16. The upper bracket and the under bracket support the front fork 17 so as to extend downward. The front fork 17 is configured to be expandable and contractible, and receives an impact from the road surface to the vehicle and a load change due to acceleration / deceleration.

The front wheel portion 20a is rotatably supported at the lower end of the front fork 17 via the axle shaft 30. The front tire 20b is attached to the front wheel portion 20a. The front wheel 20 has a configuration in which the front tire 20b is externally fitted to the front wheel portion 20a.

A brake disc is attached to the front wheel portion 20a, and a brake caliper and a brake pad are supported at the lower end of the front fork 17. The brake disc is sandwiched between the brake caliper and the brake pad, thereby generating braking force.

The handle device 38 is attached to the upper bracket or the front fork 17. By operating the steering wheel device 38, the steering shaft 16, the upper bracket, the under bracket, and the front fork 17 rotate, and at the same time, the front wheel 20 also rotates.

An engine 24 and the like are mounted on the lower side of the main frame 13, and a fuel tank 28 and the like are mounted on the upper side of the main frame 13.

A pair of rear frames 14 extend obliquely upward and backward from both sides of the main frame 13. The pair of rear frames 14 are formed of a long metal member such as a metal pipe. The pair of rear frames 14 are connected by connecting members along the vehicle width direction. A seat 29a on which the driver sits is provided on the upper side of the pair of rear frames 14, and a tandem seat 29b on which the passenger sits is provided on the rear side. Tandem steps 27 are attached to the pair of rear frames 14. A battery, an electronic control unit, and the like are incorporated between the pair of rear frames 14. A brake lamp or the like is incorporated in the rear portion of the pair of rear frame 14.

A swing arm 15 is attached to the rear portion of the main frame 13 so as to extend rearward and downward. The swing arm 15 is swingably supported with respect to the main frame 13 so as to displace its rear end up and down. A rear wheel portion 22a is rotatably supported at the rear end portion of the swing arm 15 via an axle shaft 40. The rear tire 22b is attached to the rear wheel portion 22a. The rear wheel 22 has a configuration in which the rear tire 22b is externally fitted to the rear wheel portion 22a.

A brake disc is attached to the rear wheel portion 22a, and a brake caliper and a brake pad are supported at the rear end of the swing arm 15. The brake disc is sandwiched between the brake caliper and the brake pad, thereby generating braking force.

In the motorcycle 10, the cowl 32 is provided so as to cover the front of the head pipe 12 and both sides of the main frame 13. The cowl 32 may be omitted.

The vehicle body 10B includes the vehicle body frame 11, the steering shaft 16, the upper bracket, the under bracket, the front fork 17, the swing arm 15, and the like. As described above, the front wheels 20 and the rear wheels 22 rotate on the vehicle body 10B. It is supported as much as possible.

A yaw direction vibration suppression device 160 is incorporated in the motorcycle 10. Here, the yaw direction vibration in the motorcycle 10 refers to the vibration around the yaw axis A in the vertical direction of the vehicle body 10B, and the yaw axis A of the vehicle body 10B passes through the center of gravity in the front-rear direction and the center of gravity in the width direction of the vehicle body 10B. It can be regarded as an axis. The yaw direction vibration suppression device 160 is a device that suppresses yaw direction vibration in the motorcycle 10.

The yaw direction vibration suppressing device 160 is provided at a position separated from the yaw axis A of the vehicle body 10B along the front-rear direction of the vehicle body 10B. In the present embodiment, the yaw direction vibration suppression device 160 is incorporated in the axle shaft 40 that rotatably supports the rear wheel 22. Therefore, the yaw direction vibration suppressing device 160 is provided at a position separated from the yaw axis A of the vehicle body 10B along the front-rear direction of the vehicle body 10B. Here, the yaw direction vibration suppressing device 160 is incorporated in a form housed in the axle shaft 40, but the yaw direction vibration suppressing device itself may be used as the axle shaft.

FIG. 2 is a cross-sectional view showing the yaw direction vibration suppression device 160.

The yaw direction vibration suppression device 160 includes a mass body 162, a support portion 170, and an urging portion 180.

The mass body 162 is an object having a mass. Here, the mass body 162 includes a mass body main body portion 163 and a sliding portion 164. As another example, the mass body may be formed by a single member.

The mass body main body portion 163 is formed in a columnar shape, and is a portion that occupies most of the mass of the mass body 162. The mass body body 163 is preferably composed of a substance having a mass as large as possible per unit volume, such as metal. For example, the specific gravity of the mass body body portion 163 is preferably larger than the specific gravity of the support portion 170. As a result, it is possible to secure the vibration absorption performance by utilizing a small space in a situation where the mounting space is restricted in a motorcycle or the like. As another example, the mass body body may have a spherical shape, a polygonal prism shape, or the like. A through hole 163h extending along the moving direction of the mass body 162 is formed in the mass body main body portion 163. The through hole 163h is formed in a hole shape whose cross section (cross section orthogonal to the axial direction) shows a circular shape.

The sliding portion 164 is provided on the mass body main body portion 163. Here, the sliding portion 164 is provided on the inner peripheral portion of the through hole 163h, more specifically, on the entire inner peripheral portion of both end portions of the through hole 163h. The inner peripheral portion of the sliding portion 164 projects (slightly) toward the inner peripheral side of the inner peripheral portion of the through hole 163h. In a state where the guide shaft portion 176, which will be described later, is arranged in the through hole 163h, the sliding portion 164 comes into contact with the outer peripheral surface of the guide shaft portion 176. The coefficient of dynamic friction and the coefficient of static friction (hereinafter, simply referred to as the coefficient of friction) of the sliding portion 164 with respect to the guide shaft portion 176 are smaller than the coefficient of friction of the mass body main body portion 163 with respect to the guide shaft portion 176. For example, the sliding portion 164 is a member having a slippery coating layer such as a friction resin formed on the surface of a rigid body such as metal (for example, a member used as a slide metal), or the sliding portion 164 itself with respect to the guide shaft portion 176. It is a member made of a material having a low coefficient of friction. Then, with the sliding portion 164 in contact with the guide shaft portion 176, the mass body main body portion 163 can reciprocate along the movement path. In order to increase the mass of the mass body 162 as much as possible, it is preferable that the inner diameter dimension of the through hole 163h of the mass body portion 163 matches the outer diameter dimension of the guide shaft portion 176 as long as the movement is not hindered. ..

The support portion 170 supports the yaw axis A at a position separated from the yaw axis A along the front-rear direction of the vehicle body 10B so as to be reciprocally movable along a movement path along the width direction of the vehicle body 10B. Here, the support portion 170 is formed in a cylindrical shape with both ends closed, more specifically, in a cylindrical shape with both ends closed. The mass body 162 is arranged in the support portion 170 and is movably supported along the longitudinal direction of the mass body 162. Since the mass body 162 is movably supported in the columnar internal space defined by the inner peripheral surface of the support portion 170, the movement path of the mass body 162 is along the axial direction of the internal space of the support portion 170. It is a route.

More specifically, the support portion 170 includes a support main body portion 171 and a lid portion 174 with a guide portion.

The support main body 171 is formed in a cylindrical shape with one end open and the other end closed, in this case, a cylindrical shape. A receiving recess 171g for receiving the tip of the guide shaft portion 176 is formed inside the bottom of the other end portion of the support main body portion 171.

A screw portion 172a is formed on the outer peripheral portion of one end of the support main body portion 171 and a nut seat portion 172b is formed on the inner portion of the screw portion 172a so as to project toward the outer peripheral side. A screw portion 173 is formed on the outer peripheral portion of the other end of the support main body portion 171. The other end of the support main body 171 is formed with a recess inside the screw portion 173 that is recessed inward from the end. By utilizing these screw portions 172a and 173, both end portions of the support main body portion 171 are fixed to the rear end portions of the pair of swing arms 15. In this state, the rear wheel 22 is rotatably supported by the intermediate portion of the support main body portion 171. As another example, a screw portion and a nut seat portion may be formed at an end portion of the support main body portion on the closed side, and a screw portion may be formed at the end portion on the opening side. Further, both ends of the support portion may be open and closed by separate lids.

The lid portion 174 with a guide portion includes a lid portion 175 and a guide shaft portion 176 as a guide portion.

The lid portion 175 has a shape capable of closing the opening on one end side of the support main body portion 171, and is formed in a short columnar shape here.

The guide shaft portion 176 is a rod-shaped portion extending from one end of the lid portion 175 (the end facing inward of the support main body portion 171), and penetrates through the through hole 163h of the mass body 162 to form a pair of coil springs 181. , 182 is configured to be insertable. Here, the guide shaft portion 176 is formed in the shape of a round bar. The length dimension of the guide shaft portion 176 is set to a size capable of passing through the center of the support main body portion 171 and reaching the receiving recess 171 g on the bottom side thereof. The guide shaft portion 176 is an example of a component that movably supports the mass body 162 along the movement path.

Then, when the guide shaft portion 176 is inserted into the support main body portion 171 and the lid portion 174 with the guide portion is inserted into the support main body portion 171 so as to insert the lid portion 175 into the opening on one end side of the support main body portion 171. , The lid portion 175 closes the one-end side opening of the support main body portion 171. Further, the guide shaft portion 176 penetrates the through hole 163h of the mass body 162 from the lid portion 175 and reaches the receiving recess 171g. The base end portion of the guide shaft portion 176 is supported on the central axis of the support main body portion 171 by the lid portion 175, and the tip end portion of the guide shaft portion 176 is fitted into the receiving recess 171 g to fit the support main body portion 171. Supported on the central axis. With the guide shaft portion 176 fitted into the support main body portion 171, the retaining ring member 179 is internally fitted into the opening on one end side of the support main body portion 171, whereby the guide shaft portion 176 is prevented from coming off.

Here, the guide shaft portion 176 is a member integrally formed with the lid portion 175, but as another example, the guide shaft portion and the lid portion may be formed separately. In this case, the end portion of the guide shaft portion may be fitted and fixed to the lid portion.

A gas is present in the support portion 170, and a liquid such as oil is not sealed therein. In the yaw-direction vibration suppressing device 160, the yaw-direction vibration is suppressed by transmitting the reaction force of the urging portion 180 to the displacement due to the yaw-direction vibration to the mass body 162. Therefore, no oil is required to attenuate the rate of displacement of the mass body 162 with respect to the support portion 170.

When the support portion 170 is used as the axle shaft 40, the support portion 170 is formed of a metal cylinder so as to maintain a strength sufficient to support the rear wheel 22. In addition, it may be formed of resin or the like.

As another example, the support portion may be a guide rail, and the mass body may have a configuration in which a guide groove that can move along the guide rail is formed. In this case, with the guide rail fitted in the guide groove, the mass body is supported so as to be reciprocally movable along the guide rail. Further, the support portion may be a long rod-shaped member, and the mass body may have a structure in which a guide hole through which the long rod-shaped member can be inserted is formed. In this case, the mass body is movably supported along the long rod-shaped member with the long rod-shaped member inserted through the guide hole.

The urging unit 180 urges the mass body 162 toward an intermediate position of the movement path of the mass body 162 in the support portion 170. The urging unit 180 includes two coil springs 181, 182 here. The two coil springs 181, 182 are provided on both sides of the mass body 162 along the movement path in the internal space of the support portion 170. More specifically, one coil spring 181 is provided in the support portion 170 in a compressed state between the lid portion 175 of one end portion of the support portion 170 and one end portion of the mass body 162. Here, the other coil spring 182 is provided in the support portion 170 in a compressed state between the bottom of the other end portion of the support portion 170 and the other end portion of the mass body 162. Then, the mass body 162 is urged toward the intermediate position of the movement path by the urging force that the two coil springs 181, 182 try to extend to the original length. Here, the two coil springs 181 and 182 are springs having the same performance, and the mass body 162 is urged toward the central position of its maximum movable range (described later). In this state, the guide shaft portion 176 is arranged in the pair of coil springs 181 and 182 at the outer positions of both ends of the mass body 162.

Here, the length dimension of the internal space of the support portion 170 is L1, and the allowable load length of the two coil springs 181 and 182 is L2. The permissible load length is the length of the coil springs 181 and 182 when the coil springs 181 and 182 are subjected to a load that can withstand the repeated load, and may be the close contact length depending on the properties of the coil springs 181 and 182. In this case, the length L3 of the maximum movable range of the mass body 162 is the size obtained by subtracting L2 from L1.

The natural length of the coil springs 181, 182 is larger than the value obtained by subtracting the allowable load length L2 and the length dimension L4 of the mass body 162 along the movement path from the length dimension L1 of the internal space of the support portion 170. Is preferable. As a result, in a state where the mass body 162 is moved to the end in the maximum movable range, the mass from the coil springs 181, 182 does not need to be fixed to the end of the support portion 170 and the mass body 162. It is possible to prevent the body from being separated from the body 162.

Further, the inner peripheral surface of the internal space of the support portion 170, the outer peripheral surface of the mass body 162, and the outer peripheral surfaces of the pair of coil springs 181 and 182 have a circular shape in a cross section orthogonal to the movement path of the mass body 162. It is presented. The outer diameter R1 of the outer peripheral surface of the mass body 162 coincides with the inner diameter R2 of the inner peripheral surface of the inner space to the extent that the mass body 162 can move in the internal space of the support portion 170. That is, when the outer diameter R1 of the outer peripheral surface of the mass body 162 and the inner diameter R2 of the inner peripheral surface of the internal space match, the inner peripheral surface of the internal space of the support main body 171 and the outer peripheral surface of the mass body 162 This includes the case where the mass body 162 is not in close contact with the surface and there is a dimensional difference depending on a slight gap in which the mass body 162 can move with respect to the support portion 170. As a result, the volume of the mass body 162 can be increased as much as possible, and the mass thereof can be increased. If the mass of the mass body 162 is increased, the vibration absorption can be enhanced.

Further, the outer diameter R3 of the outer peripheral surfaces of the pair of coil springs 181 and 182 coincides with the inner diameter R2 of the inner peripheral surface of the internal space to the extent that it can expand and contract in the internal space. Here, the coil springs 181 and 182 can freely expand and contract in the internal space of the support portion 170, and slightly expand in diameter when contracted. Therefore, when the outer diameter R3 of the outer peripheral surface of the pair of coil springs 181 and 182 and the inner diameter R2 of the inner peripheral surface of the internal space match, the coil springs 181 and 182 contract in the internal space and slightly expand the diameter. In this state, the case where the inner peripheral surface of the internal space of the support main body 171 is not in close contact with each other and a dimensional difference is generated according to a slight gap that can be freely expanded and contracted is included. The spring constant decreases as the coil diameter and the number of turns of the coil springs 181 and 182 increase. However, when a desired spring constant is to be obtained, if the coil diameter can be increased, the number of turns can be reduced accordingly. .. As a result, the contact length of the coil springs 181 and 182 can be shortened. If the close contact lengths of the coil springs 181 and 182 can be shortened, the range in which the mass body 162 can move can be increased.

FIG. 3 is an explanatory diagram showing an assembly example of the yaw direction vibration suppression device 160. As shown in the figure, with the coil spring 181 and the mass body 162 externally fitted to the guide shaft portion 176 of the lid portion 174 with the guide portion, the mass body 162 and one coil spring 181 are supported together with the guide shaft portion 176. It can be inserted into the portion 171. At this time, the other coil spring 182 may be inserted into the support main body portion 171 or may be externally fitted to the end portion of the guide shaft portion 176. As a result, the mass body 162 and the coil spring 181 can be easily inserted into the support main body portion 171 in a state of being aligned on the same straight line. Further, since the lid portion 175 can be fitted into the opening on one end side of the support main body portion 171 in a state where the coil spring 181 is guided by the guide shaft portion 176 on the extension of the support main body portion 171, the lid portion 175 can be fitted. The fitting work of the lid is also easy. After fitting the lid portion 174 with the guide portion, the retaining ring member 179 is internally fitted and fixed in the opening on one end side of the support main body portion 171.

While the motorcycle 10 is traveling, the yaw direction vibration suppression device 160 operates as follows.

It is assumed that vibration f1 around the yaw axis A occurs while the motorcycle 10 is traveling. It is assumed that this vibration f1 occurs. Then, the mass body 162 receives the exciting force due to the vibration f1 and moves along the movement path. Since the mass body 162 is urged toward the intermediate position of the movement path by the urging portion 180, the mass body 162 vibrates around the intermediate position. The vibration f2 of the mass body 162 becomes a movement that cancels the vibration f1 around the yaw axis A, and generates a reaction force against the vibration in the yaw direction. As a result, vibration in the yaw direction during the running of the motorcycle 10 is suppressed.

Generally, if the mass of the mass body 162 is increased, the effect of suppressing the vibration f1 around the yaw axis A becomes higher. However, since the yaw direction vibration suppression device 160 is attached to the motorcycle 10, there are restrictions on space and mass, and there is a limit to increasing the mass of the mass body 162. Therefore, when the configuration for enhancing the suppression effect of the vibration f1 around the yaw axis A was examined, it was found that the setting should be made as follows.

In the vibration suppression principle model when the yaw direction vibration suppression device 160 is attached to the vehicle body, the urging unit 180 is assumed on the performance of the vehicle body 10B of a general motorcycle 10 and the mass of the mass body 162 that can be mounted. Examining the relationship between the spring constant k and the vehicle body amplitude of the vehicle body 10B, it was found that the larger the spring constant k, the larger the vehicle body amplitude. Therefore, it is preferable to use the urging portion 180 having a spring constant k that is small to some extent.

Further, in the above model, when the relationship between the spring constant k and the operating distance of the mass body 162 (twice the amplitude of the mass body 162) is examined, the smaller the spring constant k, the larger the operating distance of the mass body 162. It has been found.

From these examination results, it can be seen that it is effective to reduce the spring constant k and increase the operating distance of the mass body 162 under the condition that there is a restriction on increasing the mass of the mass body 162. The operating distance of the mass body 162 is a length obtained by subtracting the length dimension L 4 of the mass body 162 from the length L 3 of the maximum movable range of the mass body 162, and it is preferable to increase the length as much as possible. for example, the length, may be greater than the length L 4 of the mass body 162. As a result, the mass body 162 can be vibrated with a sufficiently large operating distance, and vibration in the yaw direction can be effectively suppressed.

Further, the urging portion 180 moves the mass body 162 at an intermediate position of the movement path so that the mass body 162 moves inside the maximum movable range with respect to the acceleration in the vehicle width direction due to the yaw direction vibration of the vehicle body 10B. Yaw towards. As described above, in the configuration in which the urging portion 180 includes the two coil springs 181 and 182, even if the mass body 162 moves due to the acceleration in the vehicle width direction due to the yaw direction vibration of the vehicle body 10B, the two coil springs 181 and 182 The spring constants k of the two coil springs 181 and 182 are set so as to be within the range of expansion and contraction over the allowable load length. The acceleration in the vehicle width direction due to the yaw direction vibration of the vehicle body 10B is determined according to the mass, structure, etc. of the vehicle body 10B, and is obtained experimentally and reasonably. Then, the above relationship can be satisfied by setting the spring constant k or the like of the urging portion 180 with respect to the acceleration while considering the operating distance. As a result, even if vibration is applied in the vehicle width direction of the vehicle body 10B due to the yaw direction vibration of the vehicle body 10B, the mass body 162 can vibrate inside the maximum movable range, and the yaw direction vibration of the vehicle body 10B is effective. Can be suppressed.

Further, the natural frequency along the movement path of the mass body 162 is set within the frequency range generated by the vibration in the yaw direction of the vehicle body 10B. The frequency generated by the yaw-direction vibration of the vehicle body 10B is determined by the mass, structure, etc. of the vehicle body 10B, and is obtained experimentally and reasonably. The natural frequency of the mass body 162 in the yaw direction vibration suppression device 160 can be set by adjusting the mass of the mass body 162 and the spring constant k of the urging portion 180. By setting the natural frequency of the mass body 162 within the frequency range of the yaw direction vibration of the vehicle body 10B, the yaw direction vibration of the vehicle body 10B can be effectively suppressed.

FIG. 4 is a cross-sectional view showing another example of the yaw direction vibration suppressing device 260.

The yaw-direction vibration suppression device 260 differs from the yaw-direction vibration suppression device 160 in the following points.

First, the mass body 262 corresponding to the mass body 162 includes a mass body main body portion 263 and a sliding portion 264.

The mass body main body 263 has a configuration in which the through hole 163h is omitted in the configuration corresponding to the mass body 162. Therefore, the mass of the mass body 262 can be increased as much as possible.

Further, the sliding portion 264 is provided in the mass body main body portion 263. Here, the sliding portion 264 is provided on the outer peripheral portion of the mass body main body portion 263, more specifically, on the entire inner peripheral portion of both end portions of the outer peripheral portion. The outer peripheral portion of the sliding portion 264 protrudes (slightly) toward the outer peripheral side of the outer peripheral portion of the mass body main body portion 263. The coefficient of friction of the sliding portion 264 with respect to the inner peripheral surface of the support main body 271 is smaller than the friction coefficient of the mass body main body 263 with respect to the support main body 271. For example, the sliding portion 264 is a member (for example, a member used as a slide metal) in which a slippery coating layer such as a friction side resin is formed on the surface of a rigid body such as metal, or the sliding portion 264 itself is the inner circumference of the support main body portion 271. It is a member made of a material having a low coefficient of friction with respect to a surface. Then, with the sliding portion 264 in contact with the inner peripheral surface of the support main body portion 271, the mass body main body portion 263 can reciprocate along the movement path.

At both ends of the mass body main body 263, guide portions 266 projecting outward and arranged in the coil springs 181 and 182 are provided in a protruding shape. The guide portion 266 is set to have a protruding dimension such that it is arranged in the end portion of the coil springs 181 and 182 on the mass body 262 side.

The support portion 270 corresponding to the support portion 170 includes a support main body portion 271 and a lid portion 274 with a guide portion.

The support main body 271 differs from the support main body 171 in that the opening 271h is formed instead of the receiving recess 171g formed at the bottom. With this opening 271h, air can easily enter and exit the support main body 271, and the mass body 262 can move smoothly.

The lid portion 274 with a guide portion includes a lid portion 275 having the same configuration as the lid portion 175, and a guide portion 276. The difference from the lid portion 174 with the guide portion is that the guide portion 276, which is short enough to be arranged in the outer end portion of the coil spring 181 instead of the guide shaft portion 176, is provided as a guide portion in a protruding shape.

FIG. 5 is an explanatory view showing an assembly example of the yaw direction vibration suppression device 260. As shown in the figure, the ends of the coil springs 181 and 182 on the mass body 262 side are arranged on the guide portions 266 at both ends of the mass body 262, and the outside of the coil spring 181 is arranged on the guide portion 276 of the lid portion 274 with the guide portion. With the end portion arranged and the coil spring 181 and the mass body 262 and the coil spring 182 aligned in a straight line, the work of fitting the mass body 262, the coil spring 181 and the lid portion 274 with the guide portion into the support main body portion 271. Therefore, those fitting operations can be easily inserted.

According to the motorcycle 10 and the yaw direction vibration suppression devices 160 and 260 configured as described above, when the vehicle body 10B vibrates in the yaw direction, the mass bodies 162 and 262 vibrate in response to the vibration in the yaw direction. It is possible to absorb and suppress the vibration of the vehicle body 10B in the yaw direction.

In particular, the length obtained by subtracting the length L4 of the mass body 262 from the length L3 of the maximum movable range of the mass bodies 162 and 262 along the movement path of the mass bodies 162 and 262 is larger than the length of the mass bodies 162 and 262. Since it is large, the mass bodies 162 and 262 can be moved significantly to absorb the vehicle body 10B in the yaw direction, and the vibration of the vehicle body 10B in the yaw direction can be effectively suppressed.

Further, the urging portion 180 moves along the mass bodies 162 and 262 so that the mass bodies 162 and 262 move inside the maximum movable range with respect to the acceleration in the width direction of the vehicle due to the yaw direction vibration of the vehicle body 10B. Since the mass bodies 162 and 262 can be vibrated without being stopped at the end of the maximum movable range, the vibration of the vehicle body 10B in the yaw direction can be effectively suppressed because the mass bodies 162 and 262 are urged toward the intermediate position.

Further, since the natural frequency along the movement path of the mass bodies 162 and 262 is set within the frequency range generated by the vibration in the yaw direction of the vehicle body 10B, the vibration in the yaw direction of the vehicle body 10B is effectively suppressed. it can.

Further, since the yaw direction vibration suppression devices 160 and 260 are incorporated in the axle shaft 40 of the rear wheel 22, when the yaw direction vibration of the vehicle body 10B occurs on the rear wheel side which is the drive wheel, the vehicle body 10B Vibration in the yaw direction can be effectively suppressed.

Further, since the urging portion 180 includes a pair of coil springs 181, 182 provided on both sides of the mass bodies 162 and 262 along the movement path in the internal space of the support main body portions 171, 271, the mass bodies 162 and 262 are left and right. Vibration can be absorbed while urging with almost equal force.

Further, by matching the outer diameter R1 of the mass bodies 162 and 262 with the inner diameter R2 of the inner peripheral surface of the internal space to the extent that the mass bodies 162 and 262 can move in the internal space, the volume of the mass bodies 162 and 262 is made as large as possible. The mass can be increased. As a result, vibration absorption can be enhanced.

Further, by matching the outer diameter R3 of the outer peripheral surfaces of the pair of coil springs 181 and 182 with the inner diameter R2 of the inner peripheral surface in the internal space to the extent that the outer diameter R3 can be expanded and contracted in the internal space, the outer diameter R3 of the coil springs 181 and 182 is matched. Can be increased. As a result, it is possible to obtain desired elasticity while reducing the number of turns of the coil springs 181 and 182, and the contact length of the coil springs 181 and 182 can be shortened, and as a result, the range in which the mass bodies 162 and 262 can move can be increased. Vibration absorption can be further improved.

Further, the natural lengths of the pair of coil springs 181 and 182 are long, and it is necessary to compress them and dispose of them in the support main body portions 171 and 271. Since the guide shaft portion 176 (when shown in FIG. 2) or the guide portion 266 (when shown in FIG. 4) is provided as the guide portion arranged in the 182, a pair of coil springs are provided from both ends of the mass body 162. 181 and 182 are unlikely to shift toward the outer peripheral side in the axial direction. Therefore, the pair of coil springs 181, 182 can be arranged in the internal space of the support main body portions 171, 271.

Further, even when the mass body 162 moves in the support portion 170, the guide shaft portion 176 guides the mass body 162 in a straight line, so that the mass body 162 can smoothly reciprocate without swinging.

Further, since the guide shaft portion 176 penetrates through the through hole 163h of the mass body 162 and is arranged in the pair of coil springs 181 and 182, for example, the guide shaft portion 176 is passed through one of the coil springs 181 and has a mass. Through the through hole 163h of the body 162 and, if necessary, the other coil spring 182, these are arranged in a straight line, and the work of arranging them in the internal space of the support main body 171 is carried out. The work can be easily carried out.

Further, since the guide portions 266 are provided at both ends of the mass body 262 and the guide portions 276 are also provided at the lid portion 275, the coil spring is provided even in a configuration in which the mass body 262 does not form a through hole (see FIG. 4). The 181 and 182 can be prevented from being displaced outward in the axial direction, and the pair of coil springs 181 and 182 can be easily arranged in the internal space of the support main body 271. Further, the mass of the mass body 262 can be increased by the amount that the through hole 163h does not need to be provided in the mass body 262, and the vibration absorption can be improved.

Further, since the mass bodies 162 and 262 reciprocate in a state where the sliding portions 164 and 264 having a small friction coefficient are in contact with the support portions 170 and 270, the mass bodies 162 and 262 can move smoothly. In addition, it is easy to vibrate the mass bodies 162 and 262 at the target natural frequency.

In the above embodiment, when the mass bodies 162 and 262 move, the air in the spaces on both sides thereof is a gap between the mass bodies 162 and 262 and the support portions 170 and 270, a gap between the mass bodies 162 and the guide shaft portion 176, and the like. Go back and forth through. In order to facilitate the passage of the air, along the moving direction of the mass bodies 162 and 262 on the outer peripheral portion or the inside of the mass bodies 162 and 262, the inner peripheral surface of the support portions 170 and 270, the outer peripheral surface of the guide shaft portion 176 and the like. Grooves or holes may be formed. Further, the support portions 170 and 270 may be formed with holes for communicating the internal space and the outside.

In the present embodiment, the yaw direction vibration suppression device 160 is incorporated in the axle shaft 40 that supports the rear wheels 22, but may be incorporated in the axle shaft 30 that supports the front wheels 20. Further, the yaw direction vibration suppression device 160 may be incorporated in other parts of the rear frame 14 and the motorcycle 10. For example, the yaw direction vibration suppressing device 160 may be incorporated in a connecting member along the vehicle width direction connecting the pair of rear frames 14, a lower portion of the seat 29a, or the like. In order not to suppress the roll motion of the motorcycle 10, it is preferable that the yaw direction vibration suppressing device 160 is provided near the roll axis of the motorcycle 10. From this point of view, it is preferable that the yaw direction vibration suppressing device 160 is incorporated in the axle shafts 30 and 40. Thereby, the maneuverability can be kept good. The roll (bank) motion is a motion that rotates around the roll axis in the front-rear direction of the vehicle body.

In the above embodiment, the example in which the urging portion includes two coil springs has been described, but the urging portion may be a coil spring provided only on one side of the mass body. In this case, if one end of the coil spring is fixed to one end of the support portion and the other end is fixed to the mass body, one coil spring can urge the mass body toward the intermediate position of the moving path.

Further, as the urging portion, an elongated rubber or the like may be used.

It should be noted that the configurations described in the above-described embodiment and each modification can be appropriately combined as long as they do not conflict with each other.

Although the present invention has been described in detail as described above, the above description is an example in all aspects, and the present invention is not limited thereto. It is understood that innumerable variations not illustrated can be assumed without departing from the scope of the present invention.

As described above, the present specification includes the inventions according to the following aspects.

The first aspect is a saddle-mounted vehicle in which front wheels and rear wheels are supported on the vehicle body, and the mass body and the mass body are placed in the front-rear direction of the vehicle body with respect to the yaw axis of the yaw direction vibration of the vehicle body. A support portion that supports the mass body so as to be reciprocally movable along a movement path along the width direction of the vehicle body at a position separated along the above, and an urging portion that urges the mass body toward an intermediate position of the movement path. It is provided with a yaw direction vibration suppression device including.

As a result, when the vehicle body of the saddle-mounted vehicle vibrates in the yaw direction, the mass body vibrates in response to the vibration in the yaw direction of the vehicle body, and thus the vibration in the yaw direction of the vehicle body can be absorbed and suppressed.

The second aspect is the saddle-type vehicle according to the first aspect, in which the length of the mass body along the movement path is determined from the length of the maximum movable range of the mass body along the movement path. The reduced length is larger than the length of the mass body along the movement path.

As a result, the mass body can move significantly to absorb the vibration in the yaw direction of the vehicle body, so that the vibration in the yaw direction of the vehicle body can be effectively suppressed.

The third aspect is the saddle-mounted vehicle according to the first or second aspect, in which the mass body is inside the maximum movable range with respect to the acceleration in the width direction of the vehicle due to the yaw direction vibration of the vehicle body. The urging portion urges the mass body toward an intermediate position of the moving path so as to move in.

As a result, even when acceleration is applied in the width direction of the vehicle body due to vibration in the yaw direction of the vehicle body, the urging portion moves the mass body so that the mass body is located inside the maximum movable range. By urging toward the intermediate position of the path, it is possible to vibrate without stopping the movement of the mass body, and it is possible to effectively suppress the vibration of the vehicle body in the yaw direction.

The fourth aspect is the saddle-mounted vehicle according to any one of the first to third aspects, in which the natural frequency of the mass body along the movement path is generated by the yaw-direction vibration of the vehicle body. It is set within the frequency range to be used.

As a result, the yaw direction vibration of the vehicle body can be effectively suppressed.

A fifth aspect is a saddle-mounted vehicle according to any one of the first to fourth aspects, wherein the yaw direction vibration suppressing device is incorporated in the axle shaft of the rear wheel.

As a result, when vibration in the yaw direction of the vehicle body occurs on the drive wheel side, if a yaw direction vibration suppression device is incorporated in the axle shaft of the rear wheels, which are the drive wheels, the vibration in the yaw direction of the vehicle body is effective. Can be suppressed.

A sixth aspect is a saddle-type vehicle according to any one of the first to fifth aspects, wherein the support portion provides an internal space that movably supports the mass body along the movement path. The urging portion includes a pair of coil springs provided on both sides of the mass body along the moving path in the internal space.

As a result, the pair of coil springs on both sides of the mass body can absorb the vibration while urging the mass body with substantially equal force on the left and right sides.

A seventh aspect is the saddle-mounted vehicle according to the sixth aspect, in which the inner peripheral surface of the internal space, the outer peripheral surface of the mass body, and the outer peripheral surface of the pair of coil springs are circular in cross section. The outer diameter of the outer peripheral surface of the mass body matches the inner diameter of the inner peripheral surface of the inner space to the extent that it can move in the inner space, and is outside the outer peripheral surface of the pair of coil springs. The diameter is such that it can be expanded and contracted in the internal space, and coincides with the inner diameter of the inner peripheral surface of the internal space.

As a result, the outer diameter of the outer peripheral surface of the mass body coincides with the inner peripheral surface of the internal space to the extent that it can move in the internal space. Therefore, the volume of the mass body is made as large as possible to absorb vibration. It can enhance the sex. Further, since the outer diameter of the outer peripheral surface of the pair of coil springs coincides with the inner peripheral surface of the internal space to the extent that it can expand and contract in the internal space, the outer diameter of the coil spring can be increased. As a result, it is possible to obtain desired elasticity while reducing the number of turns of the coil spring, and the contact length of the coil spring can be shortened. As a result, the range in which the mass body can move can be increased.

The eighth aspect is the saddle-mounted vehicle according to the sixth or seventh aspect, in which guide portions arranged in the pair of coil springs are provided at the outer positions of both ends of the mass body. Is.

A ninth aspect is the saddle-mounted vehicle according to the eighth aspect, in which a through hole is formed in the mass body along the movement path, and the guide portion penetrates the through hole. At the same time, the guide shaft is inserted into the pair of coil springs.

As a result, the guide shaft separated from the mass body and the pair of coil springs penetrates the through hole and is inserted into the pair of coil springs. Therefore, for example, the guide shaft is passed through one coil spring to form the mass body. It is possible to carry out the work of arranging them in the internal space in a linearly arranged state by passing them through the through holes and, if necessary, through the other coil spring, and the work can be easily carried out.

In the yaw direction vibration suppression device according to the tenth aspect, the mass body and the mass body are separated from each other along the front-rear direction of the vehicle body with respect to the yaw axis of the yaw direction vibration of the vehicle body of the saddle-type vehicle. The movement path includes a support portion that can be reciprocally supported along a movement path along the width direction of the vehicle body and an urging portion that biases the mass body toward an intermediate position of the movement path. The length obtained by subtracting the length of the mass body along the movement path from the length of the maximum movable range of the mass body along the movement path is larger than the length of the mass body along the movement path. ..

10 Motorcycle 10B Body 20 Front wheel 22 Rear wheel 30, 40 Axle shaft 160, 260 Yaw direction vibration suppressor 162, 262 Mass body 170, 270 Support part 171, 271 Support body part 180 Bounce part 181, 182 Coil spring 163, 263 Mass body body 163h Through hole 164, 264 Sliding part 174, 274 With guide part Lid part 175, 275 Lid part 176 Guide shaft part 266 Guide part 276 Guide part A Yaw shaft

Claims (10)

A saddle-mounted vehicle with front and rear wheels supported on the vehicle body.
Mass body and
A support that reciprocates the mass body along a movement path along the width direction of the vehicle body at a position separated from the yaw axis of the yaw direction vibration of the vehicle body along the front-rear direction of the vehicle body. Department and
An urging portion that urges the mass body toward an intermediate position of the movement path, and
Bei give a yaw direction vibration suppression apparatus including,
The length obtained by subtracting the length of the mass body along the movement path from the length of the maximum movable range of the mass body along the movement path is larger than the length of the mass body along the movement path. , Saddle-mounted vehicle. A straddle-type vehicle according to claim 1 Symbol placement,
The urging portion directs the mass body to an intermediate position of the movement path so that the mass body moves inside the maximum movable range with respect to the acceleration in the width direction of the vehicle due to the yaw direction vibration of the vehicle body. A saddle-mounted vehicle that is urged. The saddle-mounted vehicle according to claim 1 or 2.
A saddle-type vehicle in which the natural frequency of the mass body along the movement path is set within the frequency range generated by the yaw-direction vibration of the vehicle body. The saddle-mounted vehicle according to any one of claims 1 to 3.
A saddle-mounted vehicle in which the specific gravity of the mass body is larger than the specific gravity of the support portion. The saddle-mounted vehicle according to any one of claims 1 to 4.
A saddle-mounted vehicle in which the yaw-direction vibration suppression device is incorporated in the axle shaft of the rear wheel. The saddle-mounted vehicle according to any one of claims 1 to 5.
The support portion includes a support main body portion having an internal space that movably supports the mass body along the movement path.
The urging portion is a saddle-mounted vehicle including a pair of coil springs provided on both sides of the mass body along the movement path in the internal space. The saddle-mounted vehicle according to claim 6.
The inner peripheral surface of the internal space, the outer peripheral surface of the mass body, and the outer peripheral surface of the pair of coil springs are formed in a circular shape in a cross section.
The outer diameter of the outer peripheral surface of the mass body matches the inner diameter of the inner peripheral surface of the inner space to the extent that it can move in the inner space.
A saddle-type vehicle in which the outer diameter of the outer peripheral surface of the pair of coil springs matches the inner diameter of the inner peripheral surface of the internal space to the extent that it can expand and contract in the internal space. The saddle-mounted vehicle according to claim 6 or 7.
A saddle-mounted vehicle provided with guide portions arranged in the pair of coil springs at outer positions at both ends of the mass body. The saddle-mounted vehicle according to claim 8.
A through hole is formed in the mass body so as to penetrate along the movement path.
The guide portion is a saddle-mounted vehicle that is a guide shaft that penetrates the through hole and is inserted into the pair of coil springs. Mass body and
The mass body is supported so as to be reciprocally movable along a movement path along the width direction of the vehicle body at a position separated from the yaw axis of the yaw direction vibration of the vehicle body of the saddle-type vehicle along the front-rear direction of the vehicle body. With possible supports and
An urging portion that urges the mass body toward an intermediate position of the movement path, and
With
The length obtained by subtracting the length of the mass body along the movement path from the length of the maximum movable range of the mass body along the movement path is larger than the length of the mass body along the movement path. , Yaw direction vibration suppression device.

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