A vehicle height adjustment device includes a changer, a vehicle speed obtainer, a vehicle height controller, and a malfunction detector. The changer is configured to change a relative position of a body of a vehicle, which includes a plurality of wheels, relative to an axle of each of the plurality of wheels of the vehicle. The vehicle speed obtainer is configured to obtain a vehicle speed, which is a traveling speed of the vehicle. The vehicle height controller is configured to control a vehicle height, which is a height of the body, based on the vehicle speed obtained by the vehicle speed obtainer. The malfunction detector is configured to detect a failure of the vehicle speed obtainer to obtain an accurate value of the vehicle speed.

A vehicle height adjustment device includes a changer, a vehicle height controller, and a malfunction detector. The changer is drivable when supplied with a current and configured to change a relative position of a body of a vehicle relative to an axle of a wheel of the vehicle. The vehicle height controller is configured to perform such control that a target current set based on the relative position is supplied to the changer so as to control a vehicle height, which is a height of the body of the vehicle. The malfunction detector is configured to detect a failure to make the target current flow to the changer.

A front suspension (4) of the telescopic type with anti-dive effect, comprising at least one sheath (32) and at least one stem (36), housed and guided telescopically inside said sheath (32) according to a direction of the fork axis Z-Z, the suspension (4) comprising a foot (44) associated to the sheath (32) or to the stem (36) that rotatably supports a wheel spindle (44) of an associable front wheel (12) defining a rotation axis X-X, a braking device (52) for the associable front wheel (12), having a support (56) rotatably mounted with respect to the wheel spindle (44) so as to be able to oscillate about the rotation axis X-X. Between the support (56) of the braking device (52) and the foot (44) of the suspension (4) are interposed transfer means (64) of the braking force, exerted by the braking device (52), on an element (32, 36) between the sheath (32) and the stem (36) that does not support the foot (44). Said transfer means (64) comprise a cam (68) hinged to the foot (44) in a first hinge point (72), kinematically connected to the braking means, and mechanically connected to a portion of the suspension (4) integral with the element (32, 36) between the sheath (32) and the stem (36) that does not support (56) the foot (44) so as to transfer thereto, in the direction of the fork axis Z-Z, a part of the braking force.

A vehicle suspension system includes a frame, a damper and a rocker arm. The frame is connected with the rocker arm through the damper, the swing part of swing arm limits the swing arm's rotation angle by matching the limit structure on the frame; the bottom of damper is provided with the universal structure, the damper is connected with the rocker arm through the universal structure, and the universal structure controls the damper in free deflection. A deviation motion of vehicle wheels on both ends by coordinating the swing arm, vibration damper, etc. to avoid the slipping and rollover due to great sides way upon vehicle steering and the lateral wheels disengagement from ground and to enhance the safety of cornering driving of vehicles.

A suspension strut includes a cylinder having a piston moveable in the cylinder, a coil spring arranged around the cylinder, and an abutment element for mounting the coil spring. The position of the abutment element is adjustably fixable along the longitudinal direction of the cylinder with respect to one direction, the cylinder has a male thread, and the abutment element has a female thread corresponding to the male thread. A thread insert is arranged in the abutment element, the thread insert has a holding region and an actuating region, and the region between the holding region and the actuating region can be arranged in the threads of the male thread of the cylinder. A holding means for the holding region is in the abutment element, the actuating region is mounted moveably in the abutment element, and the diameter of the thread insert is variable by movement of the actuating region.

A shock absorber includes a tubular outer tube, a tubular inner tube, a rod, a piston, an urging member, and a guide bush. The guide bush is a ring-shaped member arranged along an inner periphery of the outer tube, abuts against a front surface and a rear surface of the inner tube to movably hold the inner tube, and is separated from left and right side surfaces of the inner tube.

The fluid supply device comprises a screw, which has a male thread formed thereon and rotates, and a nut, which has a female thread formed therein that meshes with the male threading and which, by the screw rotating in a first direction, i.e., the circumferential direction, moves towards a first end in the rotation axis direction, and which, by moving with said movement a piston that forms a reservoir chamber, discharges a fluid stored in the reservoir chamber, wherein, if the fluid is discharged and if the screw is not rotating, first surfaces which form the threading of the male screw and second surfaces which form the threading of the female screw are in contact with each other, and second surfaces which form the threading of the male screw and first surfaces which form the threading of the female screw are not in contact with each other.

A calibration device includes: a first coefficient calculation unit, a first output unit, an ideal value calculation unit, a second coefficient calculation unit configured to calculate a second coefficient by dividing a second output value by the ideal value, the second output value being an actual output value of the detector when the extension/contraction amount of the suspension device is the first extension/contraction amount, and a calibration unit configured to calculate a calibration value which is an output value after calibration of the detector when the suspension device has the minimum extension/contraction amount, by using the second output value, the first extension/contraction amount, the operation amount, the first output value, and the second coefficient.

This motor shaft state detection method has: a rotation determination step for determining, using a detected current waveform of a motor, whether or not to be a non-rotational state in which the rotational speed of the motor is smaller than a predetermined speed; a current determination step for determining whether or not to be a supply state in which the absolute value of current supplied to the motor is larger than a predetermined reference value; and a determination step for, when it is determined to be the non-rotational state in the rotation determination step and it is determined to be the supply state in the current determination step, determining that the motor is in a shaft locked state.

ThE load weight derivation device comprises a calculation unit that calculates a contraction amount of a spring in a suspension positioned between a vehicle body and a vehicle wheel, and a derivation unit that derives the weight loaded on the vehicle body using the contraction amount calculated by the calculation unit.