Snowmobile front suspension system and method
First Claim
1. A snowmobile having a longitudinal axis and a chassis, a pair of skis each having a steering spindle defining a steering axis, and a suspension system joining each steering spindle to the chassis, the suspension system comprising, for each ski, a first control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis and having a first connection to the spindle, a second control arm pivotally mounted to the chassis for pivotal movement about a second pivot axis and having a second connection to the spindle spaced from the first connection, the pivot axis of each control arm and the connection of that control arm to the spindle defining a control arm plane, said control arm planes intersecting to define a control line that intersects a vertical plane containing said longitudinal axis.
1 Assignment
0 Petitions
Accused Products
Abstract
The snowmobile having a longitudinal axis, a chassis, a pair of skis each having a steering spindle, and a suspension system. The suspension system comprises, for each ski, a first control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis and having a first pivotal connection to the spindle and a second control arm pivotally mounted to the chassis for pivotal movement about a second pivot axis and having a second pivotal connection to the spindle spaced from the first connection. The pivot axis of each control arm and the connection of that control arm to the spindle define a control arm plane; the control arm planes intersect to define a control line that intersects a vertical plane containing said longitudinal axis.
112 Citations
45 Claims
- 1. A snowmobile having a longitudinal axis and a chassis, a pair of skis each having a steering spindle defining a steering axis, and a suspension system joining each steering spindle to the chassis, the suspension system comprising, for each ski, a first control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis and having a first connection to the spindle, a second control arm pivotally mounted to the chassis for pivotal movement about a second pivot axis and having a second connection to the spindle spaced from the first connection, the pivot axis of each control arm and the connection of that control arm to the spindle defining a control arm plane, said control arm planes intersecting to define a control line that intersects a vertical plane containing said longitudinal axis.
- 20. A snowmobile having a longitudinal axis and a chassis, a pair of skis each having a steering spindle defining a steering axis, and a suspension system joining each steering spindle to the chassis, the suspension system comprising, for each ski, a first control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis and a second control arm spaced from the first control arm and pivotally mounted to the chassis for pivotal movement about a second pivot axis, said control arms extending operatively between the chassis and the steering spindle to continuously define the steering axis as the suspension system is compressed, each of said control arm pivot axes defining, with the associated connection to the steering spindle, a control arm plane, said control arm planes intersecting to define a control line that intersects a vertical plane containing said longitudinal axis, the control arms of each ski suspension being so oriented as to cause the camber angle of the ski to move in the negative direction as that suspension is compressed from partial compression toward its fully compressed condition.
- 29. A snowmobile having a longitudinal axis and a chassis, a pair of skis each having a steering spindle defining a steering axis, and a suspension system joining the steering spindle to the chassis, the suspension system comprising, for each ski, an upper A-shaped control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis and a lower A-shaped control arm spaced beneath the first control arm and pivotally mounted to the chassis for pivotal movement about a second axis, said control arms extending operatively between the chassis and the steering spindle to continuously define the steering axis as the suspension system is compressed, the control arms, at rest, defining first and second planes that intersect rearwardly to define a control line that itself intersects a vertical plane containing the longitudinal axis of the snowmobile, said A-shaped control arms being so oriented with respect to the chassis and steering spindle as to cause the caster angle to increase and the camber angle of the ski to move in the negative direction as the suspension is compressed from a partially compressed condition toward a fully compressed condition.
- 34. A snowmobile having a longitudinal axis and a chassis, a pair of skis each having a steering spindle defining a steering axis, and a suspension system joining each steering spindle to the chassis, the suspension system comprising, for each ski, a first control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis, a second control arm spaced from the first control arm and pivotally mounted to the chassis for pivotal movement about a second pivot axis, said first and second pivot axes being fixed with respect to each other and with respect to the chassis, said control arms extending between the chassis and the steering spindle to continuously define the steering axis as the suspension system is compressed, said first and second pivot axes being non-parallel and said control arms being so attached to said steering spindle that when said suspension is compressed toward a fully compressed condition, the caster angle of the steering spindle is increased and the camber angle of the ski is moved in the negative direction.
- 42. Method of continuously controlling the caster angle of the steering spindle of a snowmobile ski as the ski suspension is compressed, comprising providing a ski suspension system joining each steering spindle to the chassis, the suspension system comprising, for each ski, a first control arm pivotally mounted to the chassis for pivotal movement about a first pivot axis and having a first connection to the spindle, a second control arm pivotally mounted to the chassis for pivotal movement about a second pivot axis and having a second connection to the spindle spaced from the first connection, the pivot axis of each control arm and the connection of that control arm to the spindle defining a control arm plane, said control arm planes intersecting to define a control line that intersects a vertical plane containing said longitudinal axis, the control arms for each ski being oriented to increase caster of the steering axis as the suspension for that ski is compressed.
Specification