Patent ID: 8438942
Filing Date: 2013-05-14
Classification: F16H,Y10T

Abstract:
1. A vehicle transmission comprising: an input shaft; first, second and third input gears disposed on the input shaft; an idler gear engaging the first input gear; a transmission shaft disposed parallel to the input shaft, the input shaft selectively driving the transmission shaft; first, second, and third transmission gears disposed on the transmission shaft, the first transmission gear engaging the idler gear, the second transmission gear engaging the second input gear, the third transmission gear engaging the third input gear; a shift drum shaft disposed parallel to the transmission shaft; at least one shift drum disposed on the shift drum shaft, the at least one shift drum being selectively operatively connected to the first, second, and third input gears and the first, second and third transmission gears, the at least one shift drum being rotatable: when in the reverse shift position, the at least one shift drum operatively engages one of the first input gear and the first transmission gear such that the input shaft drives the transmission shaft via the first input gear, the first transmission gear and the idler gear, when in the first forward shift position, the at least one shift drum operatively engages when in the neutral shift position, the at least one shift drum operatively engages when in the second forward shift position, the at least one shift drum operatively engages the third input gear and the third transmission gear such that the input shaft drives the transmission shaft via the third input gear and the third transmission gear; and a locking mechanism selectively preventing the at least one shift drum from rotating, the locking mechanism being movable between a first position and a second position, the locking mechanism being normally biased toward the second position, when in the first position, the locking mechanism prevents the at least one shift drum from rotating in the first direction between the neutral shift position and the second forward shift position, and permits rotation of the at least one shift drum sequentially between the neutral shift position and the reverse shift position, when in the second position, the locking mechanism prevents the at least one shift drum from rotating in the second direction between the first forward shift position and the reverse shift position, and permits rotation of the at least one shift drum sequentially between the first forward shift position and the second forward shift position.