tailieunhanh - Advanced Vehicle Technology Episode 2 Part 10

Tham khảo tài liệu 'advanced vehicle technology episode 2 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fig. Castor angle steering geometry a Rear wheel drive castor angle self-righting torque effect b Front wheel drive castor angle self-righting torque effect Fig. a and b Illustration of steered wheel castor self-straightening tendency times tending to align themselves with the wheels rolling when the steering has been turned to one lock. As a result the trailing or leading offset X produces a self-righting effect to the steered wheels. The greater the angle the wheels have been steered the larger the pivot centre to contact patch centre offset X and the greater the castor self-centring action will be. The self-righting action which tends to straighten out the steering after it has been turned from the straight position increases with both wheel traction and vehicle speed. Swivel joint positive and negative offset Figs When one of the front wheels slips during a brake application the inertia of the moving mass will tend to swing the vehicle about the effective wheel which is bringing about the retardation because 372 Fig. Swivel pin inclination positive offset Fig. Swivel pin inclination negative offset there is very little opposing resistance from the wheel on the opposite side Fig. . If the offset of the swivel ball joints is on the inside of the tyre contact patch the swivel inclination is known as positive offset Fig. . When the wheels are braked the positive offset distance and the inertia force of the vehicle produce a turning movement which makes the wheels pivot about the contact patch centre in an outward direction at the front Fig. . If the off side right wheel moves onto a slippery patch the vehicle will not only veer to the left due to the retarding effect of the good braked wheel preventing the vehicle moving forward but the near side left wheel will also turn and steer to the left Fig. . Therefore the positive offset compounds the natural tendency for the vehicle to swerve towards the .