초록 ▼

Disclosed herein is a jet propulsion unit comprising a housing including a wall defining a water tunnel having therein a water outlet port, and a recess located in the wall defining the tunnel and in surrounding relation to the port, and a screen located in the recess and extending across the port a

Disclosed herein is a jet propulsion unit comprising a housing including a wall defining a water tunnel having therein a water outlet port, and a recess located in the wall defining the tunnel and in surrounding relation to the port, and a screen located in the recess and extending across the port and in flush relation to the wall defining the tunnel.

대표청구항 ▼

[ We claim:] [1.] An outboard motor having a jet propulsion unit comprising in combination:a housing forming a water tunnel and having an upstream inlet and a downstream outlet, said inlet being in communication with ambient water from about a boat to which the outboard motor is mounted, said water

[ We claim:] [1.] An outboard motor having a jet propulsion unit comprising in combination:a housing forming a water tunnel and having an upstream inlet and a downstream outlet, said inlet being in communication with ambient water from about a boat to which the outboard motor is mounted, said water tunnel having an inner surface which guides said ambient water passing from said inlet to said outlet;an impeller rotatably mounted within said tunnel between said inlet and said outlet, rotation of said impeller forcing said ambient water through said tunnel;an engine connected to said housing, said engine having a water cooling jacket;drive elements connected to said engine and said impeller for transmitting rotational motion from said engine to said impeller;a conduit extending from said inner surface of said water tunnel to said water cooling jacket for passing ambient water from said tunnel to said water jacket, said conduit terminating ina port which is in flow communication with said water tunnel at a location adjacent to or downstream of said impeller and upstream of said outlet where said ambient water is at an elevated pressure;a screen overlying said port to prevent debris from entering said conduit, wherein said screen is in generally flush relationship with said inner surface of said water tunnel such that ambient water flowing through said water tunnel without entering said port washes across the face of said screen to remove any solid material therefrom.