JP4204825B2 - Steering damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steering damper and a steering device, and more particularly to a steering damper suitable for a two-wheeled vehicle using an electromagnetic force as a damping force.
[0002]
[Prior art]
For example, in a steering device for a motorcycle or the like, as shown in FIG. 2 , the upper portion of a front fork 51 whose lower end is pivotally attached to a front wheel axle (not shown) is inserted into an upper bracket 52 and an under bracket 53 and fixed. Held in a state.
[0003]
A steering shaft 54 is stretched between the upper and lower upper brackets 52 and 53 so as to be fixedly connected to the upper bracket 52 and the under bracket 53, and the steering shaft 54 is connected to a body frame of a motorcycle or the like (not shown). 55 is inserted through an axial center portion of a head pipe 56 provided at the front end.
[0004]
Here, although not shown, the handle is connected to the upper end surface of the upper bracket 52 or is connected to the upper end of the steering shaft 54. At this time, the steering shaft 54 is connected to the head pipe under the bearing 57. 56 is connected to be rotatable.
[0005]
Therefore, when the motorcycle is traveling, it is possible to steer the front wheel via the upper bracket 52 and the front fork 51 regardless of the direction of the body frame 55 by the steering operation. When vibration due to shimmy, kickback, etc. occurs, this is directly transmitted to the steering wheel, which makes the ride uncomfortable.
[0006]
Therefore, in a traveling motorcycle or the like, as shown in FIG. 3 , when vibration is input to the front wheels, a proposal is made of a steering device that suppresses vibration by attenuating the vibration with a rotary oil damper D (for example, JP 2000-25547 A).
[0007]
Similarly, it is also known that a steering damper is interposed between the vehicle body frame and the front fork (see, for example, Japanese Patent Laid-Open No. 5-201378).
[0008]
[Problems to be solved by the invention]
However, in the steering damper or steering device using the oil damper described above, there is no particular problem in terms of function, but a high damping force is obtained and it is convenient for suppressing the vibration. Necessary and requires a seal mechanism, a complicated valve mechanism, and a control mechanism to prevent this oil leakage.
[0009]
In the unlikely event that oil leaks, it may be pointed out that it may cause deterioration of the global environment. Although it has been suggested that the hydraulic fluid used in the oil damper be a biodegradable hydraulic fluid that does not pollute the global environment, the biodegradable hydraulic fluid is extremely expensive and the characteristics of this type of hydraulic fluid are buffered. Since it is insufficient to generate the proper damping force of the vessel, it has not been put into practical use.
[0010]
Accordingly, an object of the present invention is to provide a steering damper and a steering device that do not particularly require hydraulic oil.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the steering damper in the first problem solving means of the present invention includes a head pipe, a steering shaft rotatably inserted in the head pipe, and a rotation between the head pipe and the steering shaft. A freely inserted cylinder, one or more radially extending arms provided on the steering shaft, a planetary gear provided at the tip of each arm, a first sun gear provided on the cylinder, and a cylinder A coil fixed to the body, a second sun gear provided in the head pipe, and a permanent magnet fixed to the inner periphery of the head pipe so as to face the coil and generate a magnetic field in the head pipe. and will be, by interposing a planetary gear between the first sun gear and the second sun gear, each gear is meshed, it is connected to both ends of the coil to short-circuit or controller, carp Characterized by generating a damping force by the induced electromotive force generated.
[0012]
In order to achieve the above object, the steering damper in the second problem solving means of the present invention includes a head pipe, a steering shaft rotatably inserted in the head pipe, and a space between the head pipe and the steering shaft. A cylindrical body rotatably inserted into the steering shaft, one or more radially extending arms provided on the steering shaft, a planetary gear provided at the tip of each arm, a first sun gear provided on the cylindrical body, Similarly, a permanent magnet fixed to the cylinder so as to generate a magnetic field in the head pipe, a second sun gear provided in the head pipe, and a coil fixed to the inner periphery of the head pipe so as to face the permanent magnet The planetary gear is interposed between the first sun gear and the second sun gear, the gears are meshed, and both ends of the coil are short-circuited or connected to the control device. Characterized by generating a damping force by the induced electromotive force generated in the coil.
[0013]
In order to achieve the above object, the steering damper in the third problem solving means of the present invention includes a head pipe, a steering shaft rotatably inserted in the head pipe, and a space between the head pipe and the steering shaft. A cylindrical body rotatably inserted into the steering shaft, one or more radially extending arms provided on the steering shaft, a planetary gear provided at the tip of each arm, a first sun gear provided on the cylindrical body, Similarly, a coil fixed to the cylinder, a second sun gear provided in the head pipe, and a permanent magnet fixed to the steering shaft so as to face the coil and generate a magnetic field in the head pipe. The planetary gears are interposed between the first sun gear and the second sun gear, the gears are meshed, and both ends of the coil are short-circuited or connected to the control device. Characterized by generating a damping force by the induced electromotive force generated in the coil.
[0014]
Furthermore, in order to achieve the above object, the steering damper in the fourth problem solving means of the present invention includes a head pipe, a steering shaft rotatably inserted in the head pipe, and a space between the head pipe and the steering shaft. A cylindrical body rotatably inserted into the steering shaft, one or more radially extending arms provided on the steering shaft, a planetary gear provided at the tip of each arm, a first sun gear provided on the cylindrical body, Similarly, a permanent magnet fixed to the cylinder so as to generate a magnetic field in the head pipe, a second sun gear provided in the head pipe, and a coil fixed to the steering shaft so as to face the permanent magnet. A planetary gear is interposed between the first sun gear and the second sun gear, the gears are meshed, and both ends of the coil are short-circuited or connected to the control device. Is allowed, characterized in that it generates a damping force in the induced electromotive force generated in the coil.
[0015]
With the above configuration, when the steering shaft rotates, the planetary gear provided on the arm of the steering shaft also rotates, and the first sun gear that meshes therewith also rotates, so the coil attached to the cylinder also rotates, Since the coil crosses the magnetic flux of the permanent magnet fixed to the inner periphery of the head pipe , an induced electromotive force is generated in the coil.
[0016]
When both ends of the coil are short-circuited as described above, a current flows through the coil so as to generate a torque against the rotation of the steering shaft. Rotational motion will be suppressed.
[0017]
That is, since the torque against the rotation of the steering shaft acts as a damping force, the damping force can be generated without using hydraulic oil.
[0018]
Further, when both ends of the coil are connected to the control device, it is possible to control the magnitude of the current flowing in the coil due to the induced electromotive force by the control device, so that the torque against the rotation of the steering shaft can be controlled. Adjustment is possible.
[0019]
Furthermore, damping force control based on information such as the running state of a motorcycle or the like, that is, vehicle speed, steering wheel steering angular velocity, and the like is possible.
[0020]
Therefore, the ride comfort can be improved by applying the steering damper to a motorcycle or the like.
[0021]
Furthermore, as described above, the planetary gear is constituted by the first and second sun gears and the planetary gear, and this planetary gear is interposed, so that the rotational speed of the cylinder is increased or decelerated from the rotational speed of the steering shaft. The desired damping force can be obtained by combining the gear ratios of the gears in an appropriate combination.
[0022]
In other words, when this steering damper is actually applied to a motorcycle or the like, the required damping force according to the applicable vehicle model is based on the coil and permanent magnet standards if the gear ratio of each gear is appropriate. Obtained without change accordingly.
[0023]
Further, since the damping force can be changed depending on the gear ratio, it is not necessary to increase the size of the coil or the permanent magnet even when a large damping force is required.
[0024]
Further, in the steering damper in the fifth problem solving means of the present invention, in any of the first , second , third, or fourth problem solving means, the control device can select any one of the vehicle speed, the steering angular speed, and the front wheel shared load. The current flowing through the coil is adjusted based on one or any combination of values.
[0025]
Therefore, the current that flows in the coil based on the induced electromotive force generated by the rotation of the steering shaft based on each one of the values of the vehicle speed, the steering angular velocity, and the front wheel shared load, or any combination of these values. The amount can be adjusted.
[0026]
Further, at this time, since the current based on the induced electromotive force flows through the coil, it is not particularly necessary to energize, and it is only necessary to supply power only to the control device. By making the amount of current appropriate, the damping force generated by the steering damper can be adjusted to be suitable for the running state of a motorcycle or the like, so that riding comfort is improved.
[0027]
The steering damper according to the sixth problem solving means of the present invention is the steering damper according to the first , second , third , fourth, or fifth problem solving means, wherein the head pipe is coupled to the body frame of the motorcycle, and the upper and lower ends of the steering shaft are It is connected to the upper bracket and the under bracket that hold the front fork.
[0028]
Therefore, by configuring as described above, the steering damper of the present invention can be applied to a steering device.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1 , the steering damper according to one embodiment of the present invention includes a head pipe 25, a steering shaft 20 that is rotatably inserted into the head pipe 25, and the head pipe 25 and the steering shaft 20. A cylindrical body 27 rotatably inserted between them, two radially extending arms 21 provided on the steering shaft 20, a planetary gear 28 provided at the tip of each arm 21, and a first provided on the cylindrical body 27. The sun gear 27a, the coil 3 fixed to the cylindrical body 27, the second sun gear 26 provided in the head pipe 25, the inner periphery of the head pipe 25 opposed to the coil 3, and the head pipe 25 And permanent magnets 5a and 5b fixed so as to generate a magnetic field.
[0030]
Hereinafter, the head pipe 25 is formed in a cylindrical shape and is coupled to the vehicle body frame A on the outer peripheral side surface, and the yoke 4 having the permanent magnets 5a and 5b attached thereto is fixed to the inner periphery thereof. The permanent magnets 5a and 5b generate a magnetic field in the head pipe 2. Further, the yoke 4 is provided with a brush 7 that rectifies a current flowing through the coil by contacting a commutator 6 described later, a brush holder 9 that holds the brush 7, and an electric wire 8 connected to the brush 7. . In addition, a second sun gear 26 is provided on the inner periphery of the head pipe 25. Although only one brush 7 is illustrated, the brushes 7 are provided as a pair, and each brush 7 is in contact with the commutator 6. And although the electric wire 8 is not shown in figure, it is comprised from the two conducting wires connected to each brush 7, and is short-circuited at the front-end | tip. Therefore, in this case, it is not necessary to short-circuit the electric wires 8 outside the head pipe 2, so that the brushes 7 may be short-circuited within the head pipe 2.
[0031]
A cylindrical body 27 is inserted between the steering shaft 20 and the head pipe 25, and the cylindrical body 27 is connected to the head 4 via the bearings 29 and 30 disposed on the upper and lower ends of the yoke 4. The pipe 25 and the steering shaft 20 are rotatable. In addition, a coil 3 in which a conductor (not shown) is wound around the outer periphery of the cylindrical body 27 is formed, and both ends of the coil 3 are also the outer periphery of the cylindrical body 27 and in the vicinity of the coil 3. The coil 3 is connected to the provided commutator 6 and is disposed so as to face the permanent magnets 5a and 5b described above. Further, a first sun gear 27 a is formed at the upper end of the cylindrical body 27.
[0032]
The steering shaft 20 is rotatably inserted into the head pipe 25 via bearings 13 and 19 provided on the upper and lower ends of the inner periphery of the head pipe 25. At this time, the coil 3 provided on the steering shaft 20 is provided. Is disposed so as to face the above-described permanent magnets 5a and 5b.
[0033]
On the other hand, the steering shaft 20 is provided with two arms 21, and planetary gears 28 are provided at the tips of the respective arms 21. A first sun gear 27 a and a head pipe each planetary gear 28 formed on a cylindrical body 27 are provided. Each gear is meshed with each other with a second sun gear 28 provided on the inner periphery of 25. That is, a planetary gear is constituted by these gears.
[0034]
Further, a screw portion 20a is formed at the upper end portion of the steering shaft 20, and the upper bracket 16 is attached to the steering shaft 20 by being sandwiched by nuts 14 and 15 screwed into the screw portion 20a. . On the other hand, an under bracket 17 is press-fitted into the lower end portion of the steering shaft 20 , and a front fork FF is inserted into the insertion holes of the upper bracket 16 and the under bracket 17 to be used as a steering device.
[0035]
As for the operation of the steering damper, when the steering shaft 20 exhibits a rotational motion, the planetary gears 28 provided on the respective arms 21 of the steering shaft 20 also rotate. Then, the rotational movement of the planetary gear 28 is transmitted to the first sun gear 27a because the second sun gear 26 is stationary.
[0036]
Then, the coil 3 formed on the outer periphery of the cylindrical body 27 also rotates. At this time, the coil 3 crosses the magnetic flux formed in the head pipe 25 by the permanent magnets 5a and 5b. Electric power generates an induced electromotive force. A current due to the induced electromotive force flows through the coil 3, but both ends of the coil 3 are short-circuited via the commutator 6, the brush 7, and the wire of the electric wire 8. Torque against the rotation of the steering shaft 20 is generated, and the torque against the rotation of the steering shaft 20 suppresses the rotational movement of the steering shaft 20.
[0037]
That is, since the torque against the rotation of the steering shaft 20 acts as a damping force, the damping force is generated by using the current flowing in the coil by the induced electromotive force without using any special power source or hydraulic oil. This damping force can suppress the vibration even when the front wheel is vibrated by shimmy or kickback when the motorcycle is running.
[0038]
Here, since the planetary gear is used, the rotational speed of the cylinder 27 can be increased or decreased from the rotational speed of the steering shaft 20, and the gear ratios of the respective gears are appropriately combined. A desired damping force can be obtained.
[0039]
In other words, when this steering damper is actually applied to a motorcycle or the like, the required damping force according to the applicable vehicle model is based on the coil and permanent magnet standards if the gear ratio of each gear is appropriate. Obtained without change accordingly.
[0040]
Further, since the damping force can be changed depending on the gear ratio, it is not necessary to increase the size of the coil or the permanent magnet even when a large damping force is required.
[0041]
Further, in the above description, the coil 3 is short-circuited to obtain a torque that resists the rotation of the steering shaft 20, but instead, for example, the internal resistance of the coil 3 can be changed depending on the magnitude of the induced electromotive force. The amount of current flowing in the coil 3 caused by the induced electromotive force may be adjusted by this electric circuit . By doing so, it becomes possible to adjust the amount of current flowing through the coil 3, and thus the damping force generated by the steering damper can also be adjusted.
[0042]
In the illustrated case, the coil 3 is formed in the cylinder 27 and the permanent magnets 5a and 5b are provided on the inner periphery of the head pipe 25. On the contrary, the permanent magnet is attached to the cylinder 27 and the head pipe 2 side is provided. You may attach a coil to. Further, a coil may be formed on the steering shaft 20 and a permanent magnet may be attached to the cylinder 27, or a permanent magnet may be attached to the steering shaft 20 and a coil may be formed on the cylinder 27. In this case, when the steering shaft rotates, the permanent magnet or coil rotates, and the coil crosses the magnetic flux, so that an induced electromotive force is generated in the coil, and a current flows to resist the rotation of the steering shaft. Therefore, the damping action is exhibited as described above.
[0043]
Subsequently, a modification of the present embodiment will be described. In this modification, the basic configuration is the same as that of the above-described embodiment, in which the electric wire 8 of the steering damper is connected to a control device (not shown).
[0044]
The control device includes, for example, a vehicle speed detector that detects a speed of the motorcycle, a steering angular speed detector that detects a steering angular speed of the vehicle, a front wheel shared load detector that detects a front wheel shared load of the vehicle, and the vehicle speed and steering. The controller includes a controller that calculates a damping force based on the detection result of the angular velocity, and a current adjusting unit that adjusts the amount of current flowing through the coil based on the calculation result of the controller.
[0045]
The controller will be described in detail below. The controller is connected to a vehicle speed detector, a steering angular velocity detector, and a front wheel shared load detector, and can receive detection results detected by the detectors.
[0046]
Here, although not shown in the figure, the controller can receive signals of the vehicle speed and the steering angular velocity detected by each detector, can calculate a control force based on the respective signals, and can output power as a control signal. For example, an amplifier for amplifying the signal, a converter for converting an analog signal into a digital signal, a band-pass filter for cutting low and high frequency components, a CPU, a ROM, a RAM, a crystal oscillator And a computer system comprising a bus line that communicates them, and a calculation processing procedure and a control signal output procedure used for calculating the necessary damping force of the steering damper are stored in advance in a ROM as a program. A simple system is fine.
[0047]
Further, the controller is connected to the current adjusting means. The current adjusting means may be any one that can receive a signal from the controller and adjust the amount of current flowing through the coil 3 by the induced electromotive force. Therefore, for example, the current adjusting means includes an actuator driven by a signal from the controller, Assuming that the potentiometer is disposed in the electric circuit connected to the coil 3, the potentiometer is driven by an actuator to change the resistance of the electric circuit, and the amount of current flowing through the coil 3 is adjusted by the induced electromotive force. Alternatively, the resistance of the circuit of the current adjusting means may be electrically changed without using any other driving source.
[0048]
Next, the operation of the steering damper in the present embodiment will be described. While the vehicle is running, first, the vehicle speed detector, the steering angular velocity detector, and the front wheel shared load detector detect the vehicle speed, the steering angular velocity, and the front wheel shared load, and the controller determines the vehicle speed, the steering angular velocity, and the front wheel shared load. Input as a signal.
[0049]
Next, the controller calculates an appropriate damping force of the steering damper based on the input vehicle speed, steering angular velocity, and front wheel shared load values.
[0050]
Then, based on the calculation result, the current adjusting means changes the amount of current flowing through the coil 3 by the induced electromotive force, and the torque against the rotational motion of the steering shaft 1 caused by the induced electromotive force generated in the coil 3, that is, attenuation Change power.
[0051]
When the steering shaft 1 rotates in this state, an induced electromotive force is generated in the coil 3 as described above and a current flows. However, since the amount of current is adjusted by the current adjusting means, the steering damper is calculated by the controller. The generated damping force will be generated. That is, since the damping force generated by the steering damper can be adjusted to be suitable for the traveling state of a motorcycle or the like by the control means in the present embodiment, riding comfort is improved.
[0052]
At this time, for example, when the current adjusting means is composed of an actuator and a potentiometer as described above, the actuator drives the potentiometer to change the resistance value of the electric circuit of the current adjusting means. The adjusting means may be adjusted so that a resistance value required to generate the damping force required for the steering damper can be selected.
[0053]
Further, since a current based on the induced electromotive force flows through the coil, it is not particularly necessary to energize, and it is only necessary to supply power only to the control device, so that power consumption can be kept low.
[0054]
Here, in the present embodiment, the amount of current flowing through the coil 3 due to the induced electromotive force is adjusted as described above, so that the controller does not calculate the damping force of the steering damper, but the steering damper. However, it is also possible to calculate a resistance value necessary to develop a damping force.
[0056]
Further, the calculation method for calculating the damping force generated in the steering damper based on the vehicle speed and the steering angular velocity, which is recorded in advance in the controller, depends on the motion performance, the vehicle weight, etc. of the motorcycle on which the steering damper is mounted. It is only necessary to set so that control suitable for the motorcycle or the like can be performed as appropriate. For example, when the speed of a motorcycle is high and the steering angular speed is high, the controller is set so that the damping force generated by the steering damper can be increased, or when the front wheel share load is small, kickback is not performed. It may be set to increase damping force because it tends to occur.
[0057]
In the above, the current flowing through the coil is adjusted based on the values of the vehicle speed, the steering angular velocity, and the front wheel shared load, but any one or any combination of the above three values is used. It is also possible to adjust the current flowing in the coil based on each value.
[0058]
【The invention's effect】
As described above, according to the invention described in each claim , when the steering shaft rotates , the coil crosses the magnetic flux formed in the head pipe by the permanent magnet, and an induced electromotive force is generated in the coil. Torque against rotation of the steering shaft is generated, and the rotational movement of the steering shaft can be suppressed.
[0059]
That is, since the torque against the rotation of the steering shaft acts as a damping force, the damping force can be generated without using hydraulic oil.
[0060]
Further, when both ends of the coil are connected to the control device, it is possible to control the magnitude of the current flowing in the coil due to the induced electromotive force by the control device, so that the torque against the rotation of the steering shaft can be controlled. Adjustment is possible.
[0061]
Therefore, the ride comfort can be improved by applying the steering damper to a motorcycle or the like.
[0062]
In addition, since the planetary gear is used, the rotational speed of the cylinder can be increased or decreased from the rotational speed of the steering shaft, and the desired damping force can be achieved by combining the gear ratios of each gear appropriately. Can be obtained.
[0063]
In other words, when this steering damper is actually applied to a motorcycle or the like, the required damping force according to the applicable vehicle model is based on the coil and permanent magnet standards if the gear ratio of each gear is appropriate. Obtained without change accordingly.
[0064]
Further, since the damping force can be changed depending on the gear ratio, it is not necessary to increase the size of the coil or the permanent magnet even when a large damping force is required.
[0065]
According to the fifth aspect of the present invention, the control device can control the steering shaft based on any one or any combination of the vehicle speed, the steering angular speed, and the front wheel shared load. It is possible to adjust the amount of current flowing through the coil based on the induced electromotive force due to rotation.
[0066]
Further, at this time, since the current based on the induced electromotive force flows through the coil, it is not particularly necessary to energize, and it is only necessary to supply power only to the control device. By making the amount of current appropriate, the damping force generated by the steering damper can be adjusted to be suitable for the running state of a motorcycle or the like, so that riding comfort is improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a steering damper according to an embodiment .
FIG. 2 is a side view of a conventional steering device.
FIG. 3 is a side sectional view of a conventional steering device.
[Explanation of symbols]
3 Coil 4 Yoke 5a, 5b Permanent magnet 6 Commutator 7 Brush 8 Electric wire 9 Brush holder 16 Upper bracket 17 Under bracket 20 Steering shaft 20a Screw part 21 Arm 25 Head pipe 26 Second sun gear 27 Cylindrical body 27a First sun gear 28 Planetary gear A Body frame

Claims (6)

  A head pipe, a steering shaft rotatably inserted in the head pipe, a cylindrical body rotatably inserted between the head pipe and the steering shaft, and one or a plurality of radially extending portions provided on the steering shaft Each arm, a planetary gear provided at the tip of each arm, a first sun gear provided in the cylinder, a coil fixed to the cylinder, a second sun gear provided in the head pipe, and a head pipe A permanent magnet which is opposed to the coil on the inner circumference and fixed so as to generate a magnetic field in the head pipe, and a planetary gear is interposed between the first sun gear and the second sun gear. Then, the steering damper is characterized in that each gear is engaged, both ends of the coil are short-circuited or connected to a control device, and a damping force is generated by an induced electromotive force generated in the coil.   A head pipe, a steering shaft rotatably inserted in the head pipe, a cylindrical body rotatably inserted between the head pipe and the steering shaft, and one or a plurality of radially extending portions provided on the steering shaft Arm, a planetary gear provided at the tip of each arm, a first sun gear provided in the cylinder, a permanent magnet fixed to the cylinder so as to generate a magnetic field in the head pipe, and in the head pipe A second sun gear provided, and a coil fixed to the inner periphery of the head pipe so as to face the permanent magnet, and a planetary gear is interposed between the first sun gear and the second sun gear. Then, the steering damper is characterized in that each gear is engaged, both ends of the coil are short-circuited or connected to a control device, and a damping force is generated by an induced electromotive force generated in the coil.   A head pipe, a steering shaft rotatably inserted in the head pipe, a cylindrical body rotatably inserted between the head pipe and the steering shaft, and one or a plurality of radially extending portions provided on the steering shaft Each arm, a planetary gear provided at the tip of each arm, a first sun gear provided in the cylinder, a coil fixed to the cylinder, a second sun gear provided in the head pipe, and a steering shaft. A permanent magnet facing the coil and fixed so as to generate a magnetic field in the head pipe, and a planetary gear is interposed between the first sun gear and the second sun gear, A steering damper characterized in that each gear is meshed, both ends of a coil are short-circuited or connected to a control device, and a damping force is generated by an induced electromotive force generated in the coil.   A head pipe, a steering shaft rotatably inserted in the head pipe, a cylindrical body rotatably inserted between the head pipe and the steering shaft, and one or a plurality of radially extending portions provided on the steering shaft Arm, a planetary gear provided at the tip of each arm, a first sun gear provided in the cylinder, a permanent magnet fixed to the cylinder so as to generate a magnetic field in the head pipe, and in the head pipe A second sun gear provided, and a coil fixed to the steering shaft so as to face the permanent magnet, and a planetary gear is interposed between the first sun gear and the second sun gear, A steering damper characterized in that each gear is meshed, both ends of a coil are short-circuited or connected to a control device, and a damping force is generated by an induced electromotive force generated in the coil. The control device adjusts the current flowing through the coil based on any one or any combination of the vehicle speed, the steering angular velocity, and the front wheel shared load . The steering damper according to 2, 3 or 4 . The steering damper according to claim 1, 2, 3, 4, or 5 , wherein the head pipe is coupled to a body frame of the motorcycle, and upper and lower ends of the steering shaft are coupled to an upper bracket and an under bracket that hold the front fork.

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