A vehicle includes a frame; two front ground-engaging members connected to the frame; a rear ground-engaging member connected to the frame; an engine supported by the frame; a powertrain operatively connecting the engine to the rear ground-engaging member; a seat connected to the frame; an exhaust system connected to the engine and supported by the frame; a swing arm operatively connecting the rear ground-engaging member to the frame; and a rear suspension operatively connected between the swing arm and the frame. The seat is positioned at least partially above the swing arm. The exhaust system is positioned at least partially below the swing arm. Each of the rear suspension and the powertrain is at least partially concealed by the swing arm from at least two of a top, a left side or a right side of the vehicle.

A vehicle includes a frame; two front ground-engaging members connected to the frame; a rear ground-engaging member connected to the frame; an engine supported by the frame; a powertrain operatively connecting the engine to the rear ground-engaging member; a seat connected to the frame; an exhaust system connected to the engine and supported by the frame; a swing arm operatively connecting the rear ground-engaging member to the frame; and a rear suspension operatively connected between the swing arm and the frame. The seat is positioned at least partially above the swing arm. The exhaust system is positioned at least partially below the swing arm. Each of the rear suspension and the powertrain is at least partially concealed by the swing arm from at least two of a top, a left side or a right side of the vehicle.

A bicycle crank transmission apparatus includes: a hollow shaft member; a base plate coupled to the shaft member on one side and installed securely on a bottom bracket featuring a spindle on the other side; a chainring housing coupled to the shaft member in a way that allows its rotation and having a ring gear installed securely inside; a reduction gear unit arranged in the middle of the ring gear; a directly-coupled ratchet unit installed on the ring gear; a crank cover where a coupling shaft coupled to the spindle is perpendicularly provided in the center and where clutch ratchet teeth, which are engaged with the directly-coupled ratchet unit, and directly-coupled ratchet teeth are vertically stacked on the internal wall surface; and a sun gear installed on the coupling shaft in such a way that it only rotates in clockwise direction and partially engaged with the reduction gear unit.

A bicycle crank transmission apparatus includes: a hollow shaft member; a base plate coupled to the shaft member on one side and installed securely on a bottom bracket featuring a spindle on the other side; a chainring housing coupled to the shaft member in a way that allows its rotation and having a ring gear installed securely inside; a reduction gear unit arranged in the middle of the ring gear; a directly-coupled ratchet unit installed on the ring gear; a crank cover where a coupling shaft coupled to the spindle is perpendicularly provided in the center and where clutch ratchet teeth, which are engaged with the directly-coupled ratchet unit, and directly-coupled ratchet teeth are vertically stacked on the internal wall surface; and a sun gear installed on the coupling shaft in such a way that it only rotates in clockwise direction and partially engaged with the reduction gear unit.

A gear (10) for a bicycle transmission (20) is described, having an external contour (11) with teeth (12a, 12b) formed thereon, wherein the external contour (11) is defined by a maximum pitch diameter (.sub.max) and a minimum pitch diameter (.sub.min), does not have any axes of symmetry and is formed exclusively with point symmetry with respect to its centre of symmetry (M). The invention was therefore based on the problem of developing a gear (10) which improves the pedaling feel of a bicycle transmission (20). The problem is solved in that the external contour (11) exhibits a change in its curvature at every point.

A gear (10) for a bicycle transmission (20) is described, having an external contour (11) with teeth (12a, 12b) formed thereon, wherein the external contour (11) is defined by a maximum pitch diameter (.sub.max) and a minimum pitch diameter (.sub.min), does not have any axes of symmetry and is formed exclusively with point symmetry with respect to its centre of symmetry (M). The invention was therefore based on the problem of developing a gear (10) which improves the pedaling feel of a bicycle transmission (20). The problem is solved in that the external contour (11) exhibits a change in its curvature at every point.

A bicycle crank assembly with adjustment orientation system for ovoid toothed chainrings comprising a right crank arm (2) provided with a fifth torque transmission profile (211); a shaft (1) provided with a second torque transmission profile (121) which is non-rotatably engaged to said fifth profile (211); and a transmission element (3), for incorporating toothed chainrings, provided with a fourth torque transmission profile (301) to non-rotatably engage with the first torque transmission profile (120) of the shaft (1). So, when combining the N2 angular positions provided by the coupling between the right crank (2) and the shaft (1) with the N1 angular positions provided by the coupling between the transmission element (3) and the shaft (1), Nt different relative angular positions between the right crank (2) and the transmission element (3) are obtained, thus increasing the possible orientations and decreasing the angular increment between consecutive orientations of the crank assembly.

A bicycle crank assembly with adjustment orientation system for ovoid toothed chainrings comprising a right crank arm (2) provided with a fifth torque transmission profile (211); a shaft (1) provided with a second torque transmission profile (121) which is non-rotatably engaged to said fifth profile (211); and a transmission element (3), for incorporating toothed chainrings, provided with a fourth torque transmission profile (301) to non-rotatably engage with the first torque transmission profile (120) of the shaft (1). So, when combining the N2 angular positions provided by the coupling between the right crank (2) and the shaft (1) with the N1 angular positions provided by the coupling between the transmission element (3) and the shaft (1), Nt different relative angular positions between the right crank (2) and the transmission element (3) are obtained, thus increasing the possible orientations and decreasing the angular increment between consecutive orientations of the crank assembly.

A method of operating a vehicle having an engine, a throttle valve and a throttle operator. A continuously variable transmission is operatively connected to the engine and has a driving pulley, a driven pulley, and a belt operatively connecting therebetween. At least one ground engaging member is operatively connected to the driven pulley and includes at least one of a wheel and a track. A piston is operatively connected to the driving pulley for applying a piston force to the driving pulley when actuated and thereby changing an effective diameter of the driving pulley. A control unit controls actuation of the piston and the piston force. The method includes determining an engine speed, and controlling the piston force based on the engine speed.

A method of operating a vehicle having an engine, a throttle valve and a throttle operator. A continuously variable transmission is operatively connected to the engine and has a driving pulley, a driven pulley, and a belt operatively connecting therebetween. At least one ground engaging member is operatively connected to the driven pulley and includes at least one of a wheel and a track. A piston is operatively connected to the driving pulley for applying a piston force to the driving pulley when actuated and thereby changing an effective diameter of the driving pulley. A control unit controls actuation of the piston and the piston force. The method includes determining an engine speed, and controlling the piston force based on the engine speed.