A pair of split rim members are secured to the outer periphery of a wheel disc, and are provided with at least one projection piece which forms a space between it and the outer periphery of the wheel disc. An elastic sealing ring is inserted in such space to maintain airtightness, with the sealing ring having a normal width which is greater than the width of such space.

A vehicle tire having first areas of a higher degree of rigidity and second areas of a lower degree of rigidity, the first and second areas having different degrees of radially inward recession upon contact of the tire with the ground and being alternately arranged in the circumferential direction of the tire. Each of the second areas comprises a central projection and a plurality of projections surrounding the central projection in spaced relation and spaced from each other. Some of the project...

An apparatus for preventing turnover of a motorized two-wheeled vehicle of the type in which the vehicle body is provided on both sides thereof with a pair of left and right subsidiary wheels on a pair of left and right swingable arm members. On respective upper sides of the arms are a pair of left and right oil pressure dampers each interposed between the vehicle body and the arm member, and respective oil pressure chambers of the two oil pressure dampers are interconnected through a connecting...

A shell structure adapted to accommodate a propelling power unit forms part of a vehicle frame. It is made of a thin sheet, and has no practical strength but is sufficiently reinforced with its opposite side sections firmly secured to the adjacent sides of the power unit. An air path is defined in the shell structure at least between the bottom section thereof and the power unit and, extending between an air inlet and an air outlet opening formed respectively in the front and rear faces of the s...

There is disclosed a method of vehicle construction for improving the rate of production of two assemblies of a motorcycle. The two assemblies can be made simultaneously on separate assembly lines and connected together by placing the power unit in fitting engagement with the vehicle frame and, more particularly, with a shell structure forming part of the vehicle frame. In the second assembly including the power unit, the rear fork is pivotally connected with the power unit on an axis substantia...

There is disclosed a method of vehicle construction for improving the rate of production of two assemblies of a motorcycle. The two assemblies can be made simultaneously on separate assembly lines and connected together by placing the power unit in fitting engagement with the vehicle frame and, more particularly, with a shell structure forming part of the vehicle frame. In the second assembly including the power unit, the rear fork is pivotally connected with the power unit on an axis substantia...

The application discloses a cowling structure of thin sheet material secured to the head pipe and provided to support a front-fork steering shaft and forms part of the vehicle frame with a rear-wheel driving power unit solidly fitted to the cowling structure to serve as a strength member of the vehicle frame. Such cowling and power unit assembly enables substantial reduction in weight as well as in air resistance.

To provide a rotational speed adjusting device for a pneumatic rotational tool in which even if high air pressure is supplied, rotational frequency thereof does not exceed the maximum allowable rotational frequency so as to prevent occurrence of breakage of a processing tool. A speed adjusting shaft 30 is secured to one end of a rotor 26, and a speed adjusting member 32 capable of being displaced with respect to the speed adjusting shaft 30 is mounted externally of the speed adjusting shaft 30. ...

The present invention discloses a cowling structure of thin sheet material which forms a part of the vehicle frame in which the opposite side sections of the cowling firmly interconnected through the medium of the power propelling unit. Formed in one, or preferably both, of the opposite side sections of the cowling structure is an air outlet opening in which a radiator unit is fitted and a bifurcated air passage duct is defined in the cowling structure by an air-flow dividing guide plate so that...

An anti-slip system is provided for a wheeled vehicle having a drive wheel and a driven wheel. A drive wheel speed sensor senses a rotational speed of the drive wheel to produce a first sensing signal while a driven wheel speed sensor senses a rotational speed of the driven wheel to produce a second sensing signal. A control unit is responsive to the first and second sensing signals for outputting a control signal representative of a slip rate of the drive wheel. A drive control device is respon...