Patent ID: 8496096
Filing Date: 2013-07-30
Classification: B62K,F16F

Abstract:
1. A front fork which is capable of adjusting a spring force of a suspension spring housed in a fork main body constituted by a vehicle body side tube and a vehicle wheel side tube by driving a jack mechanism housed in the fork main body to raise and lower an upper end position of the suspension spring, wherein the jack mechanism comprises: a lower end side portion of a cap member that closes an upper end opening of the vehicle body side tube; and a piston member that is linked slidably to the lower end side portion and defines an expanding/contracting pressure chamber with the lower end side portion, the piston member including by supplying and discharging a pressure oil to and from the pressure chamber such that the pressure chamber expands and contracts, the piston member ascends and descends relative to the cap member, thereby raising and lowering the upper end position of the suspension spring.