Abstract: A motorcycle with a disk brake device and an anti-dip device for improving the external appearance of the front forks and for simplifying the fixing of the hoses. A single hose includes a hydraulic passage k extending from a secondary master cylinder and one end of the hose is connected to one opening of a three-way opening coupling fixed to the front forks. One end of a single hose is supported by the secondary master cylinder and the other end is supported by the three-way opening coupling. Thus the hose clamps may be omitted, the number of components is conspicuously reduced and the arrangement is simplified. In comparison to extending two hoses from the secondary master cylinder, only a single hose is extended according to the present invention. Thus, the handling of the hoses is simplified and the outer appearance near the front forks is improved.

Abstract: A vehicular disk brake device having a first air discharge mouth and a first hose connection mouth connected to a center cylinder project from an outer face of the caliper case in close proximity and so that the axes of the first hose connection mouth and the first air discharge mouth are parallel. In addition, a difference of elevation h1 is provided on both tip end faces so that the tip end face of the first air discharge mouth is higher than the tip end face of the first hose connection mouth. Since an elevation difference h1 is provided on both tip end faces so that the tip end face of the first air discharge mouth is higher than the tip end face of the first hose connection mouth, obstructing components about an air valve mounted on the first air discharge mouth are avoided.

Abstract: A motorcycle includes a swing arm, a rear wheel mounted on a leading end of the swing arm, a drive shaft disposed in the swing arm, and a final gear transmission mechanism interposed between the drive shaft and the rear wheel. The final gear transmission mechanism includes a gear case mounted on the leading end of the swing arm for supporting a rear axle; a first end bearing and a second end bearing for supporting a first end and a second end of the rear axle, respectively, a ring gear mounted on the rear axle for transmitting the rotary drive force of an engine to the rear axle; a holding portion for holding the first end of the rear axle in the axial direction of the rear axle; and a fastening member for fastening the second end bearing to the second end of the rear axle.

Abstract: A rear wheel drive mechanism acting as a drive force transmission mechanism provided in a vehicle is provided with a spline section provided on an outer periphery of one end of a first drive shaft acting as an output shaft, a spline hole provided on an inner periphery of a tubular engaging section of a universal joint and engaging with the spline section, and a circular clip disposed spanning the inner periphery and the outer periphery. An operating section of the clip faces a notched section provided on the tubular engaging section. The notched section is provided on a tip of the tubular engaging section and opens with respect to an axial dimension of the first drive shaft. The drive mechanism so configured simplifies the operation of mounting or removing a universal joint onto an output shaft of a vehicle.

Abstract: A motorcycle includes a swing arm, which is swingably supported on a vehicle body frame by a support member. A suspension link member is connected between a lower portion of the vehicle body frame and the swing arm, and a rear shock absorber is disposed extending between the suspension link member and an upper portion of the vehicle body frame. A rear wheel of the motorcycle is rotatably supported on a rear end of the swing arm, and the wheel is driven by a drive shaft extending through a hollow bore formed in the swing arm. The suspension link member is connected between a portion of the swing arm and a lower portion of the vehicle body frame, such that the portion of the swing arm which houses the drive shaft is positioned above the support member for the vehicle body frame.

Abstract: To provide the breather structure of a shaft-drive-type drive device which can miniaturize a gear casing as a whole and can exhibit an excellent appearance. A shaft-drive-type drive device is capable of transmitting an output of an engine mounted on a vehicle body to a wheel by way of a drive shaft by connecting one end of the drive shaft to an output shaft of the engine by way of a universal joint and by connecting the wheel to another end side of the drive shaft by way of gears or the like.

Abstract: An easily connected universal joint for attaching to an output shaft of an engine. A drive shaft is connected to an output shaft of an engine which is mounted on a vehicle body by way of a universal joint with a wheel being connected to a distal end side of the drive shaft. Projection portions project outwardly from a yoke of the universal joint connected to the output shaft by splines. A swing arm rockably supported on the vehicle body using one shaft with the universal joint being arranged above the shaft. A boot mounted between a distal end of the swing arm and a peripheral portion of the output shaft.

Abstract: A swing arm structure, in a shaft-driven vehicle, is configured and arranged compactly to minimize the size and weight thereof. A drive shaft of the vehicle is housed in a right arm portion of a swing arm. A front end of the drive shaft is connected to a powertrain output shaft via a universal joint. A pivot sleeve is disposed such that a central axis thereof is disposed downwardly and rearwardly of a central portion of the universal joint, and a front-end opening protrudes forwardly of the pivot sleeve. The central portion of the universal joint, having the largest diameter, is disposed forwardly of the center of a pivot shaft. This helps to keep the opening diameter small at the front of the right arm portion.

Abstract: In a rear wheel support structure for a motorcycle or a three-wheeled vehicle in which a proximal end portion of a swing arm is vertically tiltably supported on a vehicle body frame by way of a tilting support shaft, a rear wheel is rotatably supported on the swing arm by way of a rear axle, and a rear shock absorber is interposed between the swing arm and the vehicle body frame. The comfort of the ride is enhanced by ensuring a sufficiently long effective stroke of the rear shock absorber with respect to a stroke of the rear wheel. A tilting support shaft of a swing arm is arranged behind a rear axle in the longitudinal direction of the vehicle.

Abstract: A motorcycle includes a vehicle body frame, a rear swing arm which is mounted on a vehicle body frame in a rockable manner by way of a pivot shaft, and a rear wheel which is pivotally supported on a rear portion of the rear swing arm and is rotated by a driving force of a drive shaft. The pivot shaft which constitutes a support portion and an axis of the rear wheel axle are arranged at the substantially same height. The drive shaft is arranged at a position upwardly spaced-apart from the drive shaft, that is, above the pivot shaft. The drive shaft includes a shaft-length variable mechanism which can change a length of the shaft. The resulting configuration provides a motorcycle having reduce weight while maintaining support rigidity of the rear swing arm.

Abstract: To provide a rear wheel structure which can easily perform the mounting and dismounting of a rear wheel without causing a fluctuation in a banking angle. In the rear wheel structure which includes a pair of left and right swing arms which are arranged to sandwich a rear wheel, a driving force transmission device is provided for transmitting a driving force to the rear wheel along one swing arm, and a spacer which is arranged on an axle of the rear wheel. A muffler is arranged outside the swing arm on a side opposite to the driving force transmission device. The spacer is arranged between the swing arm on the driving-force-transmission-device-side and the rear wheel for mounting the rear wheel relative to the one swing arm.

Abstract: In a rear wheel support structure for a motorcycle or a three-wheeled vehicle in which a proximal end portion of a swing arm is vertically tiltably supported on a vehicle body frame by way of a tilting support shaft, a rear wheel is rotatably supported on the swing arm by way of a rear axle, and a rear shock absorber is interposed between the swing arm and the vehicle body frame. The comfort of the ride is enhanced by ensuring a sufficiently long effective stroke of the rear shock absorber with respect to a stroke of the rear wheel. A tilting support shaft of a swing arm is arranged behind a rear axle in the longitudinal direction of the vehicle.

Abstract: A link-type front suspension device for a motorcycle to improve an engine cooling efficiency without restricting a flow of engine cooling air during its running operation. The suspension device includes a split push rod having a pair of right and left rod members, the lower ends of which are rotatably attached to the front wheel supporting arms, and the upper ends of which are rotatably attached to the cushion arms. In addition, the rod members are arranged to the rear of each of the pair of right and left front forks in such a way that they overlap the forks as seen from a front elevational view. Accordingly, there is no element above the front fender and between the right and left front forks, and a appropriate wide space is formed therebetween, the space acting as an engine cooling air feeding inlet during the running operation.

Abstract: A front suspension for supporting a front wheel of a vehicle having a frame, the front suspension including a front fork which has a pair of tines, and which is supported by the frame, a pair of supporting arms, a bottom bridge, a cushion arm, a pair of push rods, first and second cushion units which are arranged in the right-and-left direction, and which are arranged between and connected to an upper portion of the front fork and the cushion arm, a single spring for supporting a load exerted on the front wheel; and a single damper for damping a vibration due to the single spring. The single spring is housed in the first cushion unit, and the single damper is housed in the second cushion unit. The structure of each of the cushion units can be simplified, and the diameter of each of the cushion units can be made smaller.

Abstract: A front suspension for supporting a front wheel of a vehicle having a frame, the front suspension including a front fork which has a pair of tines, and which is supported by the frame, a pair of supporting arms, a bottom bridge, a cushion arm, a pair of push rods, first and second cushion units which are arranged in the right-and-left direction, and which are arranged between and connected to an upper portion of the front fork and the cushion arm, a single spring for supporting a load exerted on the front wheel; and a single damper for damping a vibration due to the single spring. The single spring is housed in the first cushion unit, and the single damper is housed in the second cushion unit. The structure of each of the cushion units can be simplified, and the diameter of each of the cushion units can be made smaller.

Abstract: A link-type front suspension device for a motorcycle to improve an engine cooling efficiency without restricting a flow of engine cooling air during its running operation. The suspension device includes a split push rod having a pair of right and left rod members, the lower ends of which are rotatably attached to the front wheel supporting arms, and the upper ends of which are rotatably attached to the cushion arms. In addition, the rod members are arranged to the rear of each of the pair of right and left front forks in such a way that they overlap the forks as seen from a front elevational view. Accordingly, there is no element above the front fender and between the right and left front forks, and a appropriate wide space is formed therebetween, the space acting as an engine cooling air feeding inlet during the running operation.