Abstract: A saddle-riding type vehicle includes a vehicle body, a pivot frame that supports a swing arm for rear wheel suspension, and a rear master cylinder disposed rearwardly of the pivot frame. A reservoir tank supplies hydraulic fluid to the rear master cylinder, and the reservoir tank is disposed between the pivot frame and the rear master cylinder. A portion of the swing arm, adjacent to the reservoir tank, is configured with a concave recess formed therein extending inwardly towards a longitudinal center line of the vehicle body. The reservoir tank is situated closer to a vehicle body inner side, and is deeper in the recess than the rear master cylinder.

Abstract: A rear fender of a motorcycle includes a hollow stay portion which extends in the vehicle rearward and downward direction from a base portion thereof arranged in the inside of a rear portion of a seat rail, the stay portion is configured to be dividable, and lines for electric components are encased in a hollow portion of the stay portion.

Abstract: In the step holder mounting structure of a motorcycle which mounts step holders for supporting steps of a rider on a seat rail extending rearwardly from a main frame, the step holders are fastened to the seat rail from the inside of a vehicle.

Abstract: To operate a pillion step in one action. The pillion step is formed in a generally L shape and includes an arm portion and a foot rest portion. One end of the arm portion is pivotably secured through an oblique pivot shaft to a side face of a seat rail located under a rider seat and is pivotally moved around the oblique pivot shaft. When the pillion step is to be retracted and is pivotally moved backward, the foot rest portion moves into a gap between the rider seat and a pillion seat and its tip end is received within a grip space formed in a grip.

Abstract: An exhaust valve and a catalyst can be easily disposed of in a simple manner. The interior of a triangular muffler is partitioned into three expansion chambers. A manifold pipe is connected to the second, middle expansion chamber sideways from a lower portion thereof and is accommodated therein so as to face upward. A catalyst is accommodated in the interior of the manifold pipe. Exhaust gas flowing out from an open end of the manifold pipe expands into the second chamber. A short-circuiting aperture is formed in a second separator and is opened and closed with an exhaust valve installed within the third chamber. The exhaust valve is normally closed by a spring. When the exhaust pressure reaches a predetermined magnitude, the exhaust valve opens automatically, allowing the exhaust gas to flow out into the third chamber through the short-circuiting aperture, thereby controlling the exhaust pressure.

Abstract: A vehicle frame structure includes a pair of main frames, one of the pair of frames extending on left side of a vehicle, and the other on the right side, from the head pipe rearwards in an overall sealed cross sectional structure. At least a portion of each main frame includes a frame upper stage and a frame lower stage, each stage made up of a closed, sealed cross sectional structure. At least a portion of each main frame further includes an outer plate and an inner plate joined into an integrated piece with the frame upper stage and the frame lower stage. The plates are installed so as to extend over both sides of the frame upper stage and the frame lower stage. The frame structure provides a well-balanced high-strength main frame, and high strength in portions which join the main frame and head pipe.

Abstract: A rear cushion unit has an upper end mounted on a swing arm and a lower end coupled to pivot brackets in a position below a pivot shaft. The pivot brackets are independent of each other and are not coupled to each other. With the above construction, a fuel tank, electric parts, or other parts, for example, can be clustered between the left and right brackets. Accordingly, the parts can be disposed near the center of gravity of the vehicle body. Therefore, the maneuvering capability of racing and off-road vehicles incorporating such an arrangement can be increased. The vehicle frame can be simplified in structure and can be manufactured at a reduced cost. When the vehicle is assembled, the distance that the worker needs to move can be reduced, and hence the productivity of the vehicle is increased. The size of the vehicle is reduced because of the clustered arrangement of the parts.

Abstract: An air cleaner housing includes an upper case, a partition wall and a lower case. The inside thereof is partitioned into an upper, filtered side and a lower unfiltered side. Intake funnel pipes, connected to front and rear cylinders, project into the filtered side. An air cleaner element is provided on the front side relative to a hollow plenum above the intake funnel pipes. Inlets in side surfaces of the unfiltered side face toward a V bank of the engine. During use, air enters the bottom of the housing, and is cleaned by the air cleaner element. The clean air flows through the filtered side of the housing, into the intake funnel pipes and toward the cylinders on the lower side. A raised portion is formed on the front upper side of the upper case, and the air cleaner element is disposed inside the raised portion.

Abstract: A motorcycle body frame includes a main frame including a head pipe for supporting a front suspension at the front end thereof, a single leading frame portion extending rearwardly from the head pipe, and a rear frame portion for supporting a rear wheel suspension. The rear frame portion extends substantially downwardly from a rear part of the leading frame portion. The main frame, cast from an aluminum alloy, includes two component parts arranged front-to-rear. For example, a front frame portion is provided, and a rear frame portion is fixed to the rear side of the front frame portion. The leading frame portion has a small section portion, where the main frame is smallest in sectional area, disposed substantially centrally in the longitudinal direction thereof. The two component parts of the frame are joined at a coupling portion of the main frame situated in back of the small section portion.

Abstract: In a motorcycle, a head pipe is provided with one main frame part that extends rearwardly from the head pipe and a rear frame that extends substantially downwardly from the rear of the main frame part. A pivot is pierced in a pivot support part provided to the rear frame with a swing arm being attached to the pivot so that the swing arm can be vertically swung and a rear shock absorber unit is positioned between the swing arm and the side of the body frame. The main frame is cast in an aluminum alloy and the rear frame on the upside and the downside of the pivot supporting part projects on both sides of a vehicle from the pivot supporting part to attach right and left brackets for supporting both ends of the pivot.

Abstract: To restrain an increase in the numbers of components and process steps and achieve an easy mounting and dismounting of a pivot shaft. An arm supporting member includes a pair of left and right plate members, a middle cross pipe extending between the plate members and a center pivot plate mounted to the middle cross pipe. A pivot shaft is supported by the plate member and the center pivot plate, and a drive shaft is arranged between the plate member and the center pivot plate. The middle cross pipe is arranged above the pivot shaft on a front portion of a vehicle. The center pivot plate is provided with an upright wall as a receiving portion for aiding the positioning of the bearing member by receiving the bearing member, more specifically, the collar when assembling the swing arm to the center pivot plate and the plate member.

Abstract: An intake system for a vehicle engine includes an air cleaner and a plurality of throttle bodies. The air cleaner encases an air cleaner element in an air cleaner housing for filtering air flowing from an unfiltered air chamber to a filtered air chamber of the air cleaner housing. The throttle bodies control the amount of air supplied from the filtered air chamber to a cylinder head. Operating noise of the throttle bodies is minimized by situating the throttle bodies within the air cleaner housing. Operating noise of fuel injectors associated with the throttle bodies is minimized by situating the fuel injectors within the air cleaner housing.

Abstract: A vehicle frame structure includes a pair of main frames, one of the pair of frames extending on left side of a vehicle, and the other on the right side, from the head pipe rearwards in an overall sealed cross sectional structure. At least a portion of each main frame includes a frame upper stage and a frame lower stage, each stage made up of a closed, sealed cross sectional structure. At least a portion of each main frame further includes an outer plate and an inner plate joined into an integrated piece with the frame upper stage and the frame lower stage. The plates are installed so as to extend over both sides of the frame upper stage and the frame lower stage. The frame structure provides a well-balanced high-strength main frame, and high strength in portions which join the main frame and head pipe.

Abstract: An air cleaner housing includes an upper case, a partition wall and a lower case. The inside thereof is partitioned into an upper, filtered side and a lower unfiltered side. Intake funnel pipes, connected to front and rear cylinders, project into the filtered side. An air cleaner element is provided on the front side relative to a hollow plenum above the intake funnel pipes. Inlets in side surfaces of the unfiltered side face toward a V bank of the engine. During use, air enters the bottom of the housing, and is cleaned by the air cleaner element. The clean air flows through the filtered side of the housing, into the intake funnel pipes and toward the cylinders on the lower side. A raised portion is formed on the front upper side of the upper case, and the air cleaner element is disposed inside the raised portion.

Abstract: An intake system for a vehicle engine includes an air cleaner and a plurality of throttle bodies. The air cleaner encases an air cleaner element in an air cleaner housing for filtering air flowing from an unfiltered air chamber to a filtered air chamber of the air cleaner housing. The throttle bodies control the amount of air supplied from the filtered air chamber to a cylinder head. Operating noise of the throttle bodies is minimized by situating the throttle bodies within the air cleaner housing. Operating noise of fuel injectors associated with the throttle bodies is minimized by situating the fuel injectors within the air cleaner housing.

Abstract: A rear cushion unit has an upper end mounted on a swing arm and a lower end coupled to pivot brackets in a position below a pivot shaft. The pivot brackets are independent of each other and are not coupled to each other. With the above construction, a fuel tank, electric parts, or other parts, for example, can be clustered between the left and right brackets. Accordingly, the parts can be disposed near the center of gravity of the vehicle body. Therefore, the maneuvering capability of racing and off-road vehicles incorporating such an arrangement can be increased. The vehicle frame can be simplified in structure and can be manufactured at a reduced cost. When the vehicle is assembled, the distance that the worker needs to move can be reduced, and hence the productivity of the vehicle is increased. The size of the vehicle is reduced because of the clustered arrangement of the parts.

Abstract: The present invention relates to an adhesive tape which is low in cost and the properties of which such as unwindability, adhesiveness, trimmed clearance, printability, transparency and longitudinal tearing strength are improved without spoiling lateral hand cutting characteristics, wherein a smooth surface is formed on one side of a polyolefin resin base film and an uneven surface is formed on the other side thereof, the latter being coated with an adhesive and having an uneven depth of 0.03-0.30 mm and an uneven interval of 0.5-5.0 mm, the melt index of polyolefin resin being 0.2-20 g/10 min. and a surface wetting tension of the smooth surface of the polyolefin resin base film being less than 30 Dyn/cm and that of the uneven surface being more than 35 Dyn/cm.

Abstract: An optical system of a theodolite has an altitude angle scale plate having an altitude scale, a horizontal angle scale plate having a horizontal angle scale, a light path combining member for combining the light paths from the two scale plates, a rectangular prism member provided between one of the two scale plates and the light path combining member and having slant faces orthogonal to each other, the light beam from said one of the two scale plates being reflected by the inner surfaces of the orthogonal slant faces of the rectangular prism and thereafter reaching the light path combining member, an objective lens disposed at the exit side of the light path combining member to form the images of the scales on the two scale plates and a focusing screen on which the images of the scales by the objective lens are formed.