Rear wheel suspension device for two-wheel vehicle

A rear wheel suspension device for a bicycle, comprising:

• a hydraulic cushion unit interposed between a frame and a rear wheel axle of the bicycle;
• a surplus hydraulic oil discharging passage which discharges surplus hydraulic oil from the hydraulic cushion unit in contraction;
• an accumulator connected to the surplus hydraulic oil discharging passage;
• a compression damping force generating valve disposed in the surplus hydraulic oil discharging passage, the compression damping force generating valve maintaining a closed state when a pressure in the surplus hydraulic oil discharging passage is not higher than a predetermined cracking pressure;
• a bypass passage which bypasses the compression damping force generating valve;
• and
• a bypass valve which opens and closes the bypass passage, the bypass valve being constructed to operate in response to an input signal from a sensor which detects pedaling of the bicycle, and closes the bypass passage when pedaling is detected.

A rear wheel suspension device for a two-wheel vehicle, comprising:

• a hydraulic cushion unit interposed between a frame and a rear wheel axle of the two-wheel vehicle;
• a surplus hydraulic oil discharging passage which discharges surplus hydraulic oil from the hydraulic cushion unit in contraction;
• an accumulator connected to the surplus hydraulic oil discharging passage;
• a compression damping force generating valve disposed in the surplus hydraulic oil discharging passage, the compression damping force generating valve maintaining a closed state when a pressure in the surplus hydraulic oil discharging passage is not higher than a predetermined cracking pressure;
• a bypass passage which bypasses the compression damping force generating valve;
• and
• a bypass valve which opens and closes the bypass passage, the bypass valve comprising a needle-shaped valve body which linearly displaces according to energization of a solenoid, the solenoid being fixed on the outer side of the housing, and the valve body projecting from the solenoid into the housing to displace between a seated position in which the valve body is seated on a valve seat formed across the bypass passage and a detached position in which the valve body is detached from the valve seat.