Patent ID: 6905381
Filing Date: 2005-06-14
Classification: B63H,F02B,F02D

Abstract:
1. A jet-propulsion small watercraft, comprising: a water jet pump that pressurizes and accelerates water taken in from outside and ejects the water from an outlet port provided behind the water jet pump to propel the watercraft as a reaction of the ejecting water; a steering means configured to steer the watercraft by changing an ejection direction of the water ejected from the outlet port; a throttle operation means configured to operate a throttle valve of an engine; a steering throttle drive means configured to cause the throttle valve of the engine to open a predetermined angle under a predetermined condition, thereby maintaining a steering capability, in response to a closing operation of the throttle operation means; an actuator configured to cause the throttle valve of the engine in a closed position to open a predetermined angle by the steering throttle drive means; and a spring configured to return the throttle valve of the engine to the closed position, wherein the actuator includes a motor configured to be energized at a predetermined current value by control of a control device, a reduction mechanism configured to reduce a speed of the motor, and an output shaft configured to be rotated at a reduced speed by the reduction mechanism, and when energizing the actuator is stopped by the control of the control device, the actuator permits the throttle valve of the engine to return to the closed position by a spring force of the spring.