Abstract: A constant mesh gearbox has five parallel rotational axes. The input and output axes are not aligned. Some torque paths are via a sleeve rotatable on a shaft on one of said axes. Up to eight forward speeds are disclosed, with two very low ratios suitable for non-highway travel. The transmission is suitable for two and four wheel drive.

Abstract: A vehicle having a four-wheel-drive system including an auxiliary portion that has an auxiliary driveshaft and drive means between the auxiliary driveshaft arranged to releasably connect a second group of wheels to the driveline via a releasable torque transmitting device. The releasable torque transmitting device is operable to allow slippage of the input portion with respect to the output portions, thereby to vary an amount of torque that is transmitted to the second group of wheels.

Abstract: A gear selector comprising a gate pattern and a gear lever arranged to be moveable within the gate pattern, the gate pattern comprising: a high range gate sub-pattern comprising one or more high range gear planes for moving the gear lever into to select a high range gear; a low range gate sub-pattern comprising one or more low range gear planes for moving the gear lever into to select a low range gear; a neutral plane extending transversely with respect to the high and low range gear planes; and a force profile arranged to urge the gear lever when in the neutral plane toward a resting position in one of the one or more high range gear planes, the force profile comprising a first interference arranged to divide the high range gate sub-pattern from the low range gate sub-pattern, wherein the gear lever is moveable past the first interference from the high range gate sub-pattern to the low range gate sub-pattern when a first predefined action is performed by an operator moving the gear lever.

Abstract: A vehicle transfer case has a first input drive means, a first output drive means and a second output drive means. A first epicyclic gear set is provided in the transfer case. The first epicyclic gear set includes a first sun gear, a plurality of first planetary gears, a first planet carrier and a first ring gear. A first clutch means is configured to control the first epicyclic gear set. The first output drive means is drivingly coupled to the first input drive means; and the first clutch means selectively drivingly couples the second output drive means to the first input drive means.

Abstract: A constant mesh gearbox has five parallel rotational axes. The input and output axes are not aligned. Some torque paths are via a sleeve rotatable on a shaft on one of said axes. Up to eight forward speeds are disclosed, with two very low ratios suitable for non-highway travel. The transmission is suitable for two and four wheel drive.

Abstract: A constant mesh gear transmission has an input shaft (21, 22), two layshafts (31, 35) and an output shaft (23). Gear wheels are selectively connectable to shafts to provide forward and reverse speed ratios. A common central web (39) provides central support bearings for the shafts. The transmission is stiffened, and allows assembly of components from either end to the middle.

Abstract: A constant mesh gearbox has five parallel rotational axes. The input and output axes are not aligned. Up to eight forward speeds are disclosed, with two very low ratios suitable for non-highway travel. The transmission is suitable for two and four wheel drive.

Abstract: A constant mesh gear transmission has an input shaft (21, 22), two layshafts (31, 35) and an output shaft (23). Gear wheels are selectively connectable to shafts to provide forward and reverse speed ratios. Reverse speed ratio is via a sleeve (85, 86) of a reverse layshaft (35). The sleeve can also re-circulate torque to a forward layshaft (31) to provide an additional low forward speed ratio. Two sleeves and two additional low forward speed ratios are disclosed.

Abstract: A constant mesh gearbox has five parallel rotational axes. The input and output axes are not aligned. Up to eight forward speeds and two reverse speeds are disclosed, with two very low ratios suitable for non-highway travel. The transmission is suitable for two and four wheel drive.

Abstract: A vehicle having a four-wheel-drive system including an auxiliary portion that has an auxiliary driveshaft and drive means between the auxiliary driveshaft arranged to releasably connect a second group of wheels to the driveline via a releasable torque transmitting device. The releasable torque transmitting device is operable to allow slippage of the input portion with respect to the output portions, thereby to vary an amount of torque that is transmitted to the second group of wheels.

Abstract: A driveline for a vehicle such that a first group of one or more wheels and not a second group may be driven by prime mover means when the driveline is in a first mode of operation and the second group of one or more wheels may additionally be driven by the prime mover means when the driveline is in a second mode of operation, the driveline comprising: an auxiliary driveshaft; a power transfer unit (PTU) operable by means of PTU actuator means releasably to drivably couple the auxiliary driveshaft to the prime mover means; and a releasable drive unit operable by means of drive unit actuator means releasably to drivably couple the auxiliary driveshaft to the second group of one or more wheels, the PTU actuator means and drive unit actuator means each being powered by means of a pressurised fluid medium, the fluid medium being pressurised by a common pressurisation means.

Abstract: Embodiments of the invention provide a vehicle comprising: prime mover means; at least first and second groups of one or more wheels; and a driveline to connect the prime mover means to the first and second groups of one or more wheels such that the first group of one or more wheels is driven by the prime mover means when the driveline is in a first mode of operation and the second group of one or more wheels is additionally driven by the prime mover means when the driveline is in a second mode of operation, the driveline including an auxiliary driveline comprising an auxiliary driveshaft and drive means between the auxiliary driveshaft and the second group of one or more wheels, the drive means being operable to connect the second group of one or more wheels to the auxiliary driveshaft when the driveline transitions between the first mode and the second mode, the drive means having an input portion, an output portion and first and second releasable torque transmitting means coupled in series therebetween, th

Abstract: Embodiments of the present invention provide a motor vehicle having: a prime mover; first and second groups of one or more wheels; and a driveline to connect the prime mover to the first and second groups of one or more wheels such that the first group of one or more wheels and not the second group may be driven by the prime mover when the driveline is in a first mode of operation and both the first and second group of one or more wheels may be driven by the prime mover when the driveline is in a second mode of operation, the driveline including an auxiliary portion comprising a first releasable torque transmitting means, a prop shaft and a second releasable torque transmitting means, the first releasable torque transmitting means being operable to connect a first end of the prop shaft to the prime mover, the second releasable torque transmitting means being operable to connect a second end of the prop shaft to the second group of one or more wheels, the vehicle further comprising control means operable to co

Abstract: In one aspect of the invention there is provided a motor vehicle having: a prime mover; at least first and second groups of one or more wheels; and a driveline to connect the prime mover to the first and second groups of one or more wheels such that the first group of one or more wheels is driven by the prime mover when the driveline is in a first mode of operation and the second group of one or more wheels is additionally driven by the prime mover when the driveline is in a second mode of operation, the driveline including an auxiliary driveline comprising releasable torque transmitting means operable to connect the second group of one or more wheels to the prime mover when the driveline transitions between the first mode and the second mode, wherein when in the first mode the driveline is operable to transition to the second mode responsive to an output of a reactive evaluator and a predictive evaluator, the output of the reactive evaluator being responsive to a determination whether an amount of wheel slip

Abstract: Embodiments of the present invention provide a motor vehicle having: prime mover means; at least first and second groups of one or more wheels; and a driveline operable to connect the prime mover means to the first and second groups of one or more wheels such that the first group of one or more wheels and not the second group is coupled to a torque transmission path from the prime mover means when the driveline is in a first mode of operation and both the first and second groups of one or more wheels are coupled to a torque transmission path from the prime mover means when the driveline is in a second mode of operation, the driveline including an auxiliary portion for connecting the second group to the torque transmission path from the prime mover means, the auxiliary portion comprising first and second releasable torque transmitting means and a prop shaft, the first releasable torque transmitting means being operable to connect a first end of the prop shaft to the torque transmission path from the prime move

Abstract: Embodiments of the present invention provide a vehicle (100) comprising: prime mover means (111); a first group (112, 113) of one or more wheels; a second group (114, 115) of two or more wheels; and a driveline (105) to connect the prime mover means (111) to the first (112, 113) and second (114, 115) groups of wheels such that the first group (112, 113) of one or more wheels may be driven by the prime mover means (111) when the driveline (105) is in a first mode of operation and the second group (114,115) of wheels may additionally be driven by the prime mover means (111) when the driveline (105) is in a second mode of operation, the driveline (105) including an auxiliary driveline (110) comprising an auxiliary driveshaft (123) and drive means (125) between the auxiliary driveshaft (123) and the second group (114,115) of wheels, the drive means (125) having: an input portion; a plurality of output portions each operable to drive a respective different wheel of the second group (114, 115) of wheels; a first re

Abstract: A constant velocity fixed joint comprising an outer joint part forming an annular member with a first longitudinal axis and comprising first ball tracks. The first ball tracks extend at a distance from the first longitudinal axis and each form a first angle of crossing therewith. The joint also includes an inner joint part forms a hub with a second longitudinal axis and comprising second ball tracks. The second ball tracks extend at a distance from the second longitudinal axis and each form a second angle of crossing therewith. The first ball tracks and the second ball tracks are circurnferentially distributed and associated with one another in pairs, with the first angles of crossing and the second angles of crossing of the pairs of ball tracks being identical in size and opening in opposite directions relative to the longitudinal axes. When the longitudinal axes coincide, the points of intersection of the pairs of ball tracks form a central joint plane.