Skate truck
A skate truck is disclosed which provides for a wide yaw angle for a hanger, minimal friction during yawing of the hanger, and a suspension that is dynamically stabilized based on a weight of a rider and a turn radius of a vehicle to which the skate truck is mounted. Additionally, a tension of the skate truck can be adjusted by preloading a spring which accommodates a wide weight ranger of riders. The truck may have a hanger supported between two bearings, namely, a sliding bearing system and a thrust bearing. The sliding bearings slide within grooves that define a pivot axis of the hanger. The grooves can also have various customized ramp profiles to provide a different feel during turning of the vehicle.
1. A suspension for a vehicle, the suspension comprising:
a base mountable to a frame of the vehicle, the base having at least three semi-circularly shaped grooves within a first common plane, the at least three semi-circularly shaped grooves having a first center point, the at least three semi-circularly shaped grooves having a radius r, the at least three semi-circularly shaped grooves defining a pivot axis perpendicular to the first common plane and located at the first center point;
a hanger for mounting wheels so that the vehicle can roll on a surface, the hanger having at least three mounting recesses within a second common plane, the at least three mounting recesses defining a second center point wherein a distance between the at least three mounting recesses and the second center point is r, the second common plane of the hanger being disposed parallel to the first common plane of the base, the second center point positioned on the pivot axis; and
at least three ball bearings seated within the at least three mounting recesses and traversable along the at least three semi-circularly shaped grooves when the hanger rotates about the pivot axis.
2. The suspension of claim 1 further comprising a biasing member for urging the first and second common planes closer to each other so that the ball hearings slide within the grooves as the hanger rotates about the pivot axis.
3. The suspension of claim 2 wherein the biasing member is a compression spring.
4. The suspension of claim 3 wherein each of the at least three semi-circularly shaped grooves has a contact surface which defines a ramp profile, the at least three ball bearings slide against the contact surfaces and compress or decompress the compression spring as the at least three ball bearings slide against the contact surfaces based on the ramp profile.
5. The suspension of claim 4 wherein the ramp profiles of the at least three semi-circularly shaped grooves are identical to each other, the ramp having a progressive profile, regressive profile, linear profile or combinations thereof.
6. The suspension of claim 1 wherein the at least three semi-circularly shaped grooves are symmetrically identical to each other.
7. The suspension of claim 1 wherein the pivot axis is skewed with respect to a longitudinal axis of the frame of the vehicle.
8. A vehicle comprising:
a deck defining a front portion, a rear portion, a bottom surface and a top surface;
a first suspension system mounted to the bottom-surface at the rear portion of the deck, the first suspension comprising
a base mountable to a frame of the vehicle, the base having at least three semi-circularly shaped grooves within a first common plane, the at least three semi-circularly shaped grooves having a first center point, the at least three semi-circularly shaped grooves having a radius r 1 , the at least three semi-circularly shaped grooves defining a pivot axis perpendicular to the first common plane and located at the first center point;
a hanger for mounting wheels so that the vehicle can toll on a surface, the hanger having at least three mounting recesses within a second common plane, the at least three mounting recesses defining a second center point wherein a distance between the at least three mounting recesses and the second center point is r 1 , the second common plane of the hanger being disposed parallel to the first common plane of the base, the second center point positioned on the pivot-axis; and
at least three ball bearings seated within the at least three mounting recesses and traversable along the at least three semi-circularly shaped grooves when the hanger rotates about the pivot axis.
9. The vehicle of claim 8 wherein the pivot axis is skewed with respect to a longitudinal axis of the deck.
10. The vehicle of claim 8 further comprising a second suspension system mounted to the bottom surface at the front portion of the deck, the first and second suspension systems mounted in opposite directions to each other, the second suspension system comprising:
a base mountable to a frame of the vehicle, the base having at least three semi-circularly shaped grooves within a first common plane, the at least three semi-circularly shaped grooves having a first center point, the at least three semi-circularly shaped grooves having a radius r 2 , the at least three semi-circularly shaped grooves defining a pivot axis perpendicular to the first common plane and located at the first center point;
a hanger for mounting wheels so that the vehicle can roll on a surface, the hanger having at least three mounting recesses within a second common plane, the at least three mounting recesses defining a second center point wherein a distance between the at least three mounting recesses and the second center point is r 2 , the second common plane of the hanger being disposed parallel to the first common plane of the base, the second center point positioned on the pivot axis; and
at least three ball bearings seated within the at least three mounting recesses and traversable along the at least three semi-circularly shaped grooves when the hanger rotates about the pivot axis.