286results about "Guards" patented technology

A vehicle includes a frame assembly, an engine mounted on the frame assembly, and a continuous variable transmission connected to the engine. The continuous variable transmission includes a housing including an air intake duct and an exhaust duct, a drive shaft disposed in the housing, a drive pulley including at least one sheave disposed on the drive shaft, a driven shaft disposed in the housing and spaced from the drive shaft, a driven pulley including at least one sheave disposed on the driven shaft, and a fan disposed on the driven shaft. The fan is disposed between an inner surface of the housing and the driven pulley so as to be spaced from the driven pulley. The air intake duct defines an opening in the housing for providing air from outside the housing into the housing, and the air intake duct is axially aligned with the driven shaft and the fan disposed thereon, such that the air flows directly into the fan and is directed to the driven pulley.

A bicycle sprocket apparatus comprises a sprocket mounting member, a first sprocket, and a second sprocket. The sprocket mounting member includes a hub mounting portion and a sprocket mounting portion, wherein the hub mounting portion is structured to be mounted to a rotating hub that rotates around a rotational axis. The sprocket mounting portion includes a first sprocket mounting surface that faces in a first direction and a second sprocket mounting surface that faces in an opposite second direction. The first sprocket is disposed at the first sprocket mounting surface, and the second sprocket is disposed at the second sprocket mounting surface. A fastener fastens the first sprocket to the first sprocket mounting surface, and a chain supporting structure extends from the fastener in the first direction and projects in the first direction away from a side surface of the first sprocket that faces in the first direction.

The invention relates to a tensioning device for use in vehicle power steering assembly, in particular, having a drive unit for rotating an input pulley rotatably connected to an output pulley via a flexible belt. The tensioning device includes a housing and an arm movably attached relative to the housing. A contact device is mounted on the arm and is adapted to be engaged with a portion of the belt between the input and output pulleys. The arm is movable relative to the belt to position the contact device against the belt to provide tension on the belt.

A continuously variable transmission or an analogous torque transmitting system has two rotary members in the form of wheels, gears or pulleys (such as adjustable pulleys) which are rotatable about parallel axes. An endless flexible element in the form of a link chain, pintle chain or belt has arcuate portions trained over the rotary members and elongated reaches or stretches extending between the arcuate portions. At least one of the stretches is at least partially confined in but movable lengthwise relative to an elongated rail or another suitable guide which at least reduces lateral stray movements of the respective stretch. This reduces noise as well as the wear upon the endless flexible element and the rotary members.

An all terrain vehicle has a crankcase cover and shaft supporting arrangement through which a shaft of a transmission is mounted between the crankcase and a crankcase cover. The arrangement includes a spider bracket having a bearing carrier and a cover member attached to the crankcase through the spider arrangement. The crankcase cover is preferably made of a less thermally conductive material as compared to the spider.

A V-belt type continuously variable transmission according to the present invention includes a drive pulley assembly provided in a drive shaft, a driven pulley assembly provided in a driven shaft, a V-belt looped over both the pulley assemblies, and a transmission case assembly housing both the pulley assemblies and the V-belt. One end of the drive shaft in the shaft direction is coupled to an output side rotation member of a centrifugal clutch, and the other end of the drive shaft is rotatably supported on a boss portion formed in the transmission case assembly.

A high ground clearance drive assembly includes a drop box and an articulation drop box. The drop box is fixed to the vehicle frame and the articulation drop box pivots relative thereto as a suspension system is exercised. The articulation drop box is pivotable about a pivot pin which extends through both the articulation drop box and the drop box to provide an axial preload therebetween. A first chain interconnects an input sprocket on the input shaft and an intermediate sprocket assembly. A second chain interconnects a second intermediate sprocket and the output sprocket to drive an output shaft connected thereto. A hollow shaft supports the first and second intermediate sprockets about the pivot pin such that rotation of the articulation drop box relative the drop box is accommodated without additional complex structure.

A combined chain guide and chain ring protector for a bicycle for off-road use having a lower bracket sleeve, a chain ring around which a drive chain extends and a chain ring outer radius. The protector includes a mounting bracket secured at the lower bracket sleeve and a guard mounted thereto. An outer edge of the guard extends beyond the outer radius of the chain ring, thereby protecting a portion of the chain ring from inadvertent impacts. The chain guide extends from the mounting bracket along a path of the drive chain, and preferably includes an upper guide having an inner barrier positioned inboard of the bicycle chain an outer barrier positioned outboard of the inner barrier and an upper barrier positioned above the bicycle chain for preventing the chain from derailing from the chain ring in an upward direction.

A drive belt cooling structure for an offroad vehicle including an internal combustion engine. The engine has at least one cylinder, a piston positioned in the cylinder, and a crankshaft. The transmission includes a transmission chamber defined by a transmission case. A primary shaft of the transmission is driven by the crankshaft. A main shaft of the transmission is offset from the primary shaft and is driven by the primary shaft through a drive belt. The main shaft is arranged to drive at least one of the wheels. The primary shaft is supported by a support bracket, the support bracket being connected to the crankcase. An air inlet is adapted to permit entry of cooling air into the transmission chamber, and an air guide is configured to direct a flow of cooling air into the transmission chamber along the drive belt, the air guide being connected to the support bracket.

Disclosed is a cooling mechanism for cooling a belt-based speed-change system of an engine. The engine has a crankshaft for output of power, and the crankshaft has an end coupled to a power generator and an opposite end extending into a transmission box and coupled to the belt-based speed-change system. A wet-type clutch is arranged between the belt-based speed-change system and the engine. The wet-type clutch has a clutch cover separating the clutch from the belt-based speed-change system. The transmission box forms an air inlet and an air outlet on front and rear sides thereof, respectively. An air guide chamber is formed inside the transmission box and defines an air collection chamber communicating with the air inlet. The clutch cover is mounted to and covers the air guide chamber and defines openings in communication with the air collection chamber. An air guide lid is arranged between the belt-based speed-change system and the clutch cover, and forms an air intake opening corresponding in position to a drive disk of the belt-based speed-change system. The cooling mechanism allows external air entering the transmission box to be effectively and efficiently guided through the transmission box and expelled through the air outlet for cooling the belt-based speed-change system with enhanced performance.

A chain guide, including a chain guide member and a guide holder, in which deformation and/or scarring of the guide holder can be controlled, and which is easy to assemble and disassemble, is described. The position of a front end of the guide holder is brought in contact with a flange provided at the front end of the chain guide member. Left and right side surfaces of the chain guide member are formed on the backside of the flange. The leading edge of the front end of the guide holder abuts and confronts the left and right side surface of the backside of the flange of the chain guide member so that a chain entering the chain guide contacts the chain guide member rather than the guide holder. A method of manufacturing the guide holder is presented.

A rear derailleur guard for mounting onto a bicycle with an axle, a wheel, a horizontal frame member, a vertical frame member and a rear derailleur. The guard has a main region with an apex, a horizontal member that extends forwardly from the main region and contains a semi-circular horizontal clip, a vertical member that extends upwardly from the main region and contains a semi-circular vertical clip and a lower shield that extends downwardly and forwardly from the main region. When the guard is mounted, the horizontal clip attaches to the horizontal frame member and the vertical clip attaches to the vertical frame member. The axle protrudes between the horizontal member and the vertical member adjacent to the apex. The lower shield has an inside edge, an outside edge and exterior and interior surfaces extending therebetween. The outside edge curves such that it is perpendicular to the interior surface.

A belt-type continuously variable transmission that prevents escape of noise generated by a resin block belt to the outside. The resin block belt is wound around a primary sheave and a secondary sheave. A transmission case defines a belt chamber accommodating the primary sheave, secondary sheave, and resin block belt. The transmission case includes an exhaust passage, intake passages, and a sound absorbing member. The sound absorbing member is attached to an inner wall of the exhaust passage in a position to collide with sound waves traveling through the exhaust passage. The sound absorbing member has a sound absorbing surface crossing an extending direction of the exhaust passage.

A chain guide device which can be easily mounted with a reduced number of parts. The chain guide device for guiding a chain in a vehicle includes a main frame and a rear swing arm extending rearward from the main frame. The chain guide device also includes a stay extending downward from the rear swing arm, a sectionally U-shaped plate member fastened to the stay using fastening members, and a chain guide member mounted in the plate member. The chain guide member has a chain guide hole through which the chain passes through to be guided. The chain guide member is fixed by fitting the lower surface and the right and left side surfaces of the chain guide member to the plate member and by fitting the upper surface of the chain guide member to the stay.

A bicycle derailleur is provided with a chain guide that basically includes inner and outer guide plates, a guide pulley and a tension pulley. The tension pulley is rotatable about a rotation axis between free ends of the guide plates. The tension pulley has an annular recess disposed about the rotation axis to form a projection. The inner guide plate has a guide section with a radially outermost edge. Preferably, the outermost edge of the guide section is located in the annular recess, and the projection projects axially further from a center plane of the tension pulley than the outermost edge. Preferably, the chain guide includes a dust cap coupled between the inner guide plate and the tension pulley. Preferably, the outermost edge of the guide section is located radially inwardly of the projection and radially outwardly of the annular portion of the dust cap.

A bicycle chain wheel assembly is provided with a chain wheel and a chain wheel cover. The chain wheel has a central mounting portion and an outer gear with a plurality of outer gear teeth. The chain wheel cover is disposed on an exteriorly facing side of the chain wheel. The chain wheel cover has a mounting portion coupled to the chain wheel and an outer peripheral portion with a chain drop prevention protrusion projecting outwardly from the outer peripheral portion at a location that is radially inward of the outer gear teeth.

A wheel hub (8) for a two-wheeled vehicle and a traction element transmission that can be coupled to the wheel hub (8) are described. The wheel hub (8) comprises, inter alia, an axle, a housing, a driver, a transmission, which couples the driver and the housing to one another, an output wheel (13) of a traction element transmission, and a releasable coupling, which couples the output wheel (13) to the driver. The output wheel (13) is attached to the two-wheeled vehicle in such a way that it remains on the two-wheeled vehicle when the coupling between the driver and the output wheel (13) is released.

The traction element transmission for a two-wheeled vehicle, in which the rear wheel is attached rigidly to the frame or is supported in a sprung manner on a swing arm, comprises an input wheel (12), an output wheel (13) and an endless coupling means (14). In this arrangement, the input wheel (12) and the output wheel (13) interact directly with the endless coupling means (14). The traction element transmission furthermore comprises a first compensation mechanism, which acts on a guide wheel (15.1, 15.2) for the coupling means (14), by means of which compensation mechanism the guide wheel (15.1, 15.2) can be moved over a first radial path, and a second compensation mechanism, which acts on a guide wheel (15.1, 15.2) for the coupling means (14), by means of which compensation mechanism the guide wheel (15.1, 15.2) can be moved over a second radial path. Here, the first path is longer than the second path.

The interplay between these two components makes possible a two-wheeled vehicle, the traction element transmission of which is safe and requires little maintenance despite its mobile rear-wheel swing arm, which may be present, and the rear wheel of which can be removed from the two-wheeled vehicle without interfering with the traction element transmission.

An engine having an engine case on one side of which a V-belt type of continuously variable transmission is provided, the CVT being placed in a transmission case and constituted that a V-belt is routed around a drive pulley and a driven pulley, the drive pulley being attached to one end of a crankshaft, the driven pulley being attached to one end of a transmission shaft parallel to the crankshaft, characterized in that

• • the crankshaft is supported for free rotation with the engine case, one end of the crankshaft is projected in cantilever fashion from the engine case into the transmission case, the drive pulley is attached to the projected portion, and the transmission case is made as a component separate from or independent of the engine case and supported with the engine case so that a space is present between the engine case and the transmission case.