Vehicle suspension system with variable geometry

• US 6,032,752 A
• Filed: 05/09/1997
• Issued: 03/07/2000
• Est. Priority Date: 05/09/1997
• Status: Expired due to Fees

• Current Assignee: Fast Action Support Team, Inc.
• Original Assignee: Fast Action Support Team, Inc.
• Inventors: Karpik, Gerard J., Karpik, David J., Miers, Scott A., Lehman, Michael A.
• Primary Examiner(s): Boehler, Anne Marie
• Assistant Examiner(s): CUFF, MICHAEL A
• Application Number:
  US08/853,442
• Time in Patent Office: 1,033 Days
• Field of Search: 180/9.52, 180/190, 180/193, 305/131
• US Class Current: 180/9.52
• CPC Class Codes: B60G 13/005 characterised by the mounting on the axle or suspension arm of the damper unit
• CPC Class Codes: B60G 15/06 and fluid damper
• CPC Class Codes: B60G 2204/129 Damper mount on wheel suspension or knuckle
• CPC Class Codes: B60G 2204/42 Joints with cam surfaces
• CPC Class Codes: B60G 2204/421 Pivoted lever mechanisms for mounting suspension elements, e.g. Watt linkage
• CPC Class Codes: B60G 2204/422 Links for mounting suspension elements
• CPC Class Codes: B60G 2204/43 Fittings, brackets or knuckles
• CPC Class Codes: B60G 2300/32 Track vehicles

Abstract

A vehicle suspension system with a variable geometry. A moveable suspension arm is pivotally attached to a vehicle chassis. A biasing/dampening mechanism is operatively attached to the vehicle chassis at a first end. An actuator mechanism operatively connects the second end of the biasing/dampening mechanism to the moveable suspension arm. The actuator mechanism has a mechanism for moving the second end along at least one axis when the vehicle is in a static or dynamic mode to increase or decrease the motion ratio or displacement of the biasing/dampening mechanism to the total displacement of the suspension system relative to the vehicle chassis. A control mechanism is provided for activating the actuator mechanism.

Claims

1. A vehicle suspension system with variable geometry for suspending an endless track beneath a vehicle, comprising:

a rigid suspension arm pivotally attached to a vehicle chassis;

a biasing/dampening mechanism having a first end operatively attached to the chassis and a second end;

an electric actuator mechanism operatively connecting the second end of the biasing/dampening mechanism to the moveable suspension arm, the actuator mechanism having means for moving the second end along at least one axis when the vehicle is in a dynamic mode to alter the motion ratio of the vehicle suspension system, and

a control mechanism for activating the actuator mechanism, wherein the actuator mechanism is intermittently connected in series with an electric power source on the vehicle.

2. The apparatus of claim 1 wherein the actuator mechanism is capable of increasing the motion ratio of the displacement of the biasing/dampening mechanism to a total displacement of the suspension system relative to the chassis.

3. The apparatus of claim 1 wherein the actuator mechanism is capable of decreasing the motion ratio of the displacement of the biasing/dampening mechanism to a total displacement of the suspension system relative to the chassis.

4. The apparatus of claim 1 wherein the actuator mechanism is pivotally connected to the moveable suspension arm.

5. The apparatus of claim 1 wherein the biasing/dampening mechanism comprises a shock absorber/damper.

6. The apparatus of claim 1 wherein the biasing/dampening mechanism comprises a shock absorber and a spring.

7. The apparatus of claim 1 comprising sensor means for sensing the location of the second end of the biasing/dampening mechanism.

8. The apparatus of claim 1 comprising display means for providing an indication of the location of the second end of the biasing/dampening mechanism.

9. The apparatus of claim 1 wherein the actuator mechanism comprises a mechanical linkage for displacing the second end of the biasing/dampening mechanism and an electric motor coupled to the mechanical linkage.

10. The apparatus of claim 1 wherein the actuator mechanism comprises an electric motor.

11. The apparatus of claim 10 comprising:

a first power converter for converting alternating current from the electric power source on the vehicle to direct current prior to the electric motor;

a second power converter for converting direct current from the motor to alternating current; and

means for directing the alternating current from the second power converter to an electric system on the vehicle.

12. The apparatus of claim 1 wherein the vehicle is selected from a group consisting of snowmobiles, all-terrain vehicles, bicycle, and motor cycles.

13. A suspension system with variable geometry for suspending an endless track beneath a tracked vehicle, the suspension assembly having an elongated slide rail with a bottom track engaging portion defining a longitudinal axis, at least one rigid suspension arm pivotally connecting the vehicle chassis with the slide rail, and a biasing/dampening mechanism for urging the slide rail away from the vehicle chassis, the biasing/dampening mechanism having an first end operatively connected to the vehicle chassis at a first location and a second end operatively connected to the slide rail at a second location, the suspension system comprising:

an electric actuator mechanism operatively connecting the second end of the biasing/dampening mechanism to the slide rail, the actuator mechanism having means for moving the second end along at least one axis when the vehicle is in a dynamic mode to alter the displacement of the biasing/dampening mechanism to a total displacement of the slide rail relative to the chassis; and

a control mechanism for activating the actuator mechanism, wherein the actuator mechanism is intermittently connected with an electric power source on the tracked vehicle.

14. The apparatus of claim 13, wherein the actuator mechanism is operatively connected to the slide rail by a mechanical linkage system.

15. The apparatus of claim 13 comprising sensor means for sensing the location of the second end of the biasing/dampening mechanism relative to the slide rail when the tracked vehicle is in the dynamic mode.

16. The apparatus of claim 13 comprising display means for providing an indication of the location of the second end of the biasing/dampening mechanism relative to the slide rail when the tracked vehicle is in the dynamic mode.

17. The apparatus of claim 13 wherein the actuator mechanism comprises a mechanical linkage for displacing the second end of the biasing/dampening mechanism along the longitudinal axis and an electric motor coupled to the mechanical linkage.

18. The apparatus of claim 17 wherein the electric motor is switched in and out in series with an electrical system on the tracked vehicle.

19. The apparatus of claim 13 comprising suspension arm regulating means for regulating the movement of the slide rail relative to the vehicle chassis.

20. The apparatus of claim 13 comprising suspension arm regulating means comprises a slot mechanism to permit sliding engagement between the slide rail and the suspension arm.

21. The apparatus of claim 13 wherein the biasing/dampening mechanism comprises a coil spring concentrically disposed about a shock absorber.

22. A method for adjusting the geometry of a suspension system on a vehicle comprising the steps of:

pivotally attaching a moveable suspension arm to a vehicle chassis;

applying a biasing force between the chassis and a first location on the moveable suspension arm using a biasing/dampening mechanism;

connecting an actuator mechanism in series to an electrical system on the vehicle, and

signaling a control mechanism to activate the actuator mechanism when the vehicle is in a dynamic mode, whereby the location where the biasing force engages with the moveable suspension arm is displaced to a second location and the motion ratio of the suspension system is altered.

23. The method of claim 22 comprising the step of pivotally attaching the actuator mechanism to the moveable suspension arm.

24. The method of claim 22 comprising the steps of:

sensing the location of the second end of the biasing/dampening mechanism; and

providing an indication of the location of the second end of the biasing/dampening mechanism to a display device.

25. The method of claim 22 comprising the step of increasing the motion ratio of the biasing force relative to a total displacement of the suspension system relative to the chassis.

26. The method of claim 22 comprising the step of decreasing the motion ratio of the biasing force relative to a total displacement of the suspension system relative to the chassis.

27. The method of claim 22 comprising the steps of:

converting alternating current from the electric power source on the vehicle to direct current prior to the actuator mechanism; and

converting direct current from the motor to alternating current; and

directing the alternating current from the motor an electric system on the vehicle.

28. A suspension system with variable geometry for suspending an endless track beneath a tracked vehicle, the suspension assembly having an elongated slide rail with a bottom track engaging portion defining a longitudinal axis, at least one rigid suspension arm pivotally connecting the vehicle chassis with the slide rail, and a biasing/dampening, mechanism for urging the slide rail away from the vehicle chassis, the biasing/dampening mechanism having an first end operatively connected to the vehicle chassis and a second end, the suspension system comprising:

an electric actuator mechanism mounted on the slide rail and operatively connecting the second end of the biasing/dampening mechanism to the slide rail, the actuator mechanism being capable of moving the second end along at least one axis when the vehicle is in a dynamic mode to alter the displacement of the biasing/dampening mechanism relative to a total displacement of the slide rail relative to the chassis; and

a control mechanism for activating the actuator mechanism.

29. A suspension system with variable geometry for suspending an endless track beneath a tracked vehicle, the suspension assembly having an elongated slide rail with a bottom track engaging portion defining a longitudinal axis, at least one rigid suspension arm pivotally connecting the vehicle chassis with the slide rail, and a biasing/dampening mechanism for urging the slide rail away from the vehicle chassis, the biasing/dampening mechanism having an first end operatively connected to the slide rail and a second end, the suspension system comprising:

an electric actuator mechanism mounted to the vehicle chassis and operatively connecting the second end of the biasing/dampening mechanism to the vehicle chassis, the actuator mechanism being capable of moving the second end along an axis when the vehicle is in a dynamic mode to alter the displacement of the biasing/dampening mechanism relative to a total displacement of the slide rail relative to the chassis; and

a control mechanism for remotely activating the actuator mechanism.