A traveling vehicle includes: a vehicle body frame, a pair of right and left front crawler traveling devices, a pair of right and left rear crawler traveling devices, a front suspension device that suspends the pair of right and left front crawler traveling devices on the vehicle body frame, and a rear suspension device that suspends the pair of right and left rear crawler traveling devices on the vehicle body frame. The front suspension device integrally suspends the pair of right and left front crawler traveling devices on the vehicle body frame and allows the pair of right and left front crawler traveling devices to be swingable in the vertical direction with respect to the vehicle body frame.

The shock absorber includes a shock absorber main body, a spring seat that supports one end of a suspension spring and is movable in an axial direction of the shock absorber main body, a jack that adjusts a position of the spring seat, and an auxiliary spring interposed between the spring seat and the jack.

A swing arm secures rigidity, and is lighter than a conventional swing arm, includes a hollow body with a pivot hole in which a pivot shaft is disposed, a suspension fixing portion in the body connected to one end portion of a suspension unit, and a pair of arms extending from the body and supporting respective ends of a wheel axle. Each of the pair of arms includes an outer member having an open cross-section and an inner member having an open cross-section. The outer member and the inner member of each of the arms are joined at respective open end portions. The body includes first opening portions joined with a corresponding one edge portion of the outer member of the arms, second opening portions joined with a corresponding outer surface of the inner member of the arms, and reinforcing support-struts that partition the first and second opening portions.

A swing arm secures rigidity, and is lighter than a conventional swing arm, includes a hollow body with a pivot hole in which a pivot shaft is disposed, a suspension fixing portion in the body connected to one end portion of a suspension unit, and a pair of arms extending from the body and supporting respective ends of a wheel axle. Each of the pair of arms includes an outer member having an open cross-section and an inner member having an open cross-section. The outer member and the inner member of each of the arms are joined at respective open end portions. The body includes first opening portions joined with a corresponding one edge portion of the outer member of the arms, second opening portions joined with a corresponding outer surface of the inner member of the arms, and reinforcing support-struts that partition the first and second opening portions.

A motor vehicle with at least a first driving wheel tilting with respect to a first rotation axis transverse to the motor vehicle and a second driving wheel tilting with respect to a second rotation axis transverse to the motor vehicle has a power source for power generation and a transmission for power transmission to the first tilting driving wheel and second tilting driving wheel.

A motor vehicle with at least a first driving wheel tilting with respect to a first rotation axis transverse to the motor vehicle and a second driving wheel tilting with respect to a second rotation axis transverse to the motor vehicle has a power source for power generation and a transmission for power transmission to the first tilting driving wheel and second tilting driving wheel.

A motorcycle includes an electric motor having an output shaft defining a motor axis, a rear wheel drivably coupled to the electric motor to propel the motorcycle, a swingarm rotatably supporting the rear wheel, and a frame. The frame includes a main frame member supporting the electric motor and the swingarm. A case of the electric motor is a stressed member of the frame between the main frame member and the swingarm. The swingarm is coupled to the case of the electric motor to define a swingarm pivot axis that is co-axial with the motor axis.

A motorcycle includes an electric motor having an output shaft defining a motor axis, a rear wheel drivably coupled to the electric motor to propel the motorcycle, a swingarm rotatably supporting the rear wheel, and a frame. The frame includes a main frame member supporting the electric motor and the swingarm. A case of the electric motor is a stressed member of the frame between the main frame member and the swingarm. The swingarm is coupled to the case of the electric motor to define a swingarm pivot axis that is co-axial with the motor axis.

This design incorporates four separate modules which are bolted together in this succession: a welded, structural single-unit steering tube/downtube module; independent, twin, front-to-rear horizontal frame rails which serve as the support for the rider to stand; a welded, structural single-unit module to mount shock absorbers and a swingarm; and, a welded swingarm. The defined space between the twin frame rails and the two adjoining modules can be modified by altering the length of the frame rails and/or using spacers between each rail and its corresponding module at the bolt-on location.

This design incorporates four separate modules which are bolted together in this succession: a welded, structural single-unit steering tube/downtube module; independent, twin, front-to-rear horizontal frame rails which serve as the support for the rider to stand; a welded, structural single-unit module to mount shock absorbers and a swingarm; and, a welded swingarm. The defined space between the twin frame rails and the two adjoining modules can be modified by altering the length of the frame rails and/or using spacers between each rail and its corresponding module at the bolt-on location.