Patent ID: 6739609
Filing Date: 2004-05-25
Classification: B62K

Abstract:
A front fork for a motorcycle, comprising:a vehicle-body tube connected to a vehicle body; a vehicle-wheel tube connected to a vehicle-wheel and engaging to slide freely with respect to the vehicle-body tube; a damper disposed in an interior space formed within the-vehicle-body tube, and having one end connected to said vehicle-wheel tube, and another end connected to said vehicle-body tube, the damper extending or compressing in response to extension or compression of the tubes; a suspension spring disposed in the interior space, and being longitudinally disposed between the vehicle-body tube and the damper, the suspension spring being biased in a direction extending the tubes; a first gas chamber formed in the interior space, and an oil chamber positioned below the first gas chamber and introducing oil from the damper, an oil surface in the oil chamber varying as a result of a compression stroke position of the front fork; a second gas chamber formed in the interior space and connected to the first gas chamber through an orifice; a space A formed between an outer periphery of the suspension spring and an inner periphery of the vehicle-body tube, the space A being closed by entry of a tip of the vehicle-wheel tube within the space A, and the space A being opened when the tip of the vehicle-wheel tube is moved from within the space A, thereby allowing oil in the oil chamber to flow through the space A; wherein a hole is provided that communicates with the first gas chamber, and allows a flow of all oil after the space A is closed.