Abstract: A vehicle transmission includes a crankshaft box unit, a clutch unit, and a transmission box unit. The crankshaft box unit includes a crankshaft box, a crankshaft extending through the clutch unit and into the transmission box unit, a driven shaft disposed in the transmission box unit and having an end sleeved on a connecting end of the crankshaft, and a bearing disposed between the crankshaft and the driven shaft. The clutch unit includes a seal cover disposed in proximity to the crankshaft box, and a wet clutch disposed between the seal cover and the crankshaft box. The crankshaft extends through the seal cover. The connecting end of the crankshaft is disposed in a transmission box of the transmission box unit.

Abstract: A gearbox for all terrain vehicles which includes an engine having a crankshaft which drives a belt transmission mechanism of a transmission case thereby transmitting power to a final axle in the gearbox via a driven axle of the belt transmission mechanism, wherein the driven axle has an end extending into the gearbox and provided with a torque release mechanism, characterized in that the driven axle in the gearbox has an end on which is mounted a torque release mechanism for releasing the momentary increased torque and power when the terrain vehicle is thrown up and down and accelerated to increase the performance of the engine as it touches the ground.

Abstract: The present invention is to provide a transmission gearbox comprising a gearshift shifting mechanism formed by a gearshift hub, a first push rod, a second push rod, a first sliding block and a second sliding block to transfer engine driving force from a driven shaft through a linking shaft and a main shaft to an output shaft, wherein the first sliding block is slidably mounted on the main shaft; the main shaft has mounted thereon a forward gear, a low-range gear, and a transmission gear; the second sliding block is slidably mounted on the linking shaft; the linking shaft has mounted thereon a back gear, a low-range gear, a forward gear, and a drive bevel gear, the back gear being mounted on the linking shaft at one side relative to the second sliding block, the low-range gear, forward gear and drive bevel gear at the linking shaft being disposed at one side relative to the second sliding block opposite to the back gear.

Abstract: A gearbox for all terrain vehicles which includes an engine having a crankshaft which drives a belt transmission mechanism of a transmission case thereby transmitting power to a final axle in the gearbox via a driven axle of the belt transmission mechanism, wherein the driven axle has an end extending into the gearbox and provided with a torque release mechanism, characterized in that the driven axle in the gearbox has an end on which is mounted a torque release mechanism for releasing the momentary increased torque and power when the terrain vehicle is thrown up and down and accelerated to increase the performance of the engine as it touches the ground,

Abstract: A gearbox permits easy assembly, simple structure, reduced number of parts required, and facilitated service of chains and sprockets in an automobile power unit; having a worm provided as one end of the main shaft in the gearbox to protrude out of the bearing; whereby a space being defined on the gearbox to accommodate a active lever provided with gear tooth to mate the worm, another end of the active lever coupled to tachometer wire to transmit rpm of gears in the gearbox to the tachometer.

Abstract: The present invention discloses a gear shift assembly for all-terrain vehicles which comprises a gear shift rod, for driving a transmission wheel to drive a first gear shift fork and a second gear shift fork to move for driving a first sliding member and a second sliding member of a gear shift to shift gears, wherein the first gear shift fork is disposed on the external periphery of a sleeve, and a guiding member and a spring are disposed in sequence on the gear shift fork to define a whole gear shift fork module on the sleeve by passing a pin of the first gear shift fork through the guiding member, such that the internal periphery of the gear shift fork module is coupled onto the gear shift fork rod. Thus, the invention can simplify the manufacturing process, lower costs and facilitate the assembly.

Abstract: The present invention is to provide a transmission gearbox comprising a gearshift shifting mechanism formed by a gearshift hub, a first push rod, a second push rod, a first sliding block and a second sliding block to transfer engine driving force from a driven shaft through a linking shaft and a main shaft to an output shaft, wherein the first sliding block is slidably mounted on the main shaft; the main shaft has mounted thereon a forward gear, a low-range gear, and a transmission gear; the second sliding block is slidably mounted on the linking shaft; the linking shaft has mounted thereon a back gear, a low-range gear, a forward gear, and a drive bevel gear, the back gear being mounted on the linking shaft at one side relative to the second sliding block, the low-range gear, forward gear and drive bevel gear at the linking shaft being disposed at one side relative to the second sliding block opposite to the back gear.

Abstract: A transmission case cover for all terrain vehicles with a holder provided to the transmission case cover of a continuously variable transmission mechanism, an opening disposed in the space encompassed by the holder facing the crankshaft, the space being covered by a mobile cover containing also an manual starter for effective increasing the common functions of the transmission cover to reduce its production cost and promote its universality without compromising the efficacy of the continuously variable transmission.

Abstract: A gearbox permits easy assembly, simple structure, reduced number of parts required, and facilitated service of chains and sprockets in an automobile power unit; having a worm provided as one end of the main shaft in the gearbox to protrude out of the bearing; whereby a space being defined on the gearbox to accommodate a active lever provided with gear tooth to mate the worm, another end of the active lever coupled to tachometer wire to transmit rpm of gears in the gearbox to the tachometer.

Abstract: The present invention concerns a cooling structure for a continuous variation transmission system of an all-terrain vehicle. Primarily speaking, it has an inlet conduit attached to the air inlet of the gearbox, with said inlet conduit extending in front of the engine until it reaches the below of the front mud guard, and an inlet box attached to the inlet conduit. An exhaust conduit is also being attached to the exhaust of the gearbox, with said exhaust pipe extending to the rear of the engine until it reaches the below of the rear mud guard, and an exhaust box is attached to the exhaust conduit. Both the inlet box and the exhaust box are placed above the tail of the engine exhaust conduit, and situated on the outer surface of the chassis. The inlet and exhaust box design prevents dust, dirt and water from entering the gearbox. Furthermore, the conduits are installed on the outer surface of the chassis to enable ease of assembly and maintenance, and to reduce the difficulty of installing other components.