Valve operating device with stopping function for internal combustion engine

A valve operating device having a stopping function in an internal combustion engine, comprising:

• a cam shaft having a cylindrical hole;
• a rotary valve comprising a cylindrical part and an engaging end part, said cylindrical part being rotatably inserted into said cylindrical hole;
• and
• a centrifugal governor mounted on one end portion of said cam shaft by spline coupling, in which:
• said centrifugal governor has weight arms, each of which has one end engaged with an engaging end portion of a rotary valve,
• an annular groove communicated both with a passage to said oil pressure supplying source and with a passage to an oil-pressure-operated part and communicating holes for communicating said annular groove with a cylindrical hole are formed in an outer wall of a rotary shaft,
• radial leak holes communicating an outside of a cylindrical part of said rotary valve with an inside of said cylindrical part opened to the atmosphere are formed in said rotary valve in such a manner as to communicate with said communicating holes of said rotary shaft, and said rotary valve rotating relative to said rotary shaft when said centrifugal governor rotates at a predetermined speed, thereby to establish one of a communication condition in which said passages are not opened to the atmosphere and a communication condition in which said passages are communicated with said inside which is opened to the atmosphere.

A valve operating device having a stopping function in an internal combustion engine, comprising:

• a cam shaft having a cylindrical hole;
• a rotary valve comprising a cylindrical part and an engaging end part, said cylindrical part being rotatably inserted into said cylindrical hole;
• and
• a centrifugal governor mounted on one end portion of said cam shaft by spline coupling, wherein:
• said centrifugal governor has weight arms each of which has one end engaged with an engaging end portion of a rotary valve,
• a first annular groove communicating with a first passage to an oil pressure supplying source and a second annular groove communicating with a record passage to an oil-pressure-operated part are formed in an outer wall of a rotary shaft,
• communicating holes communicating said first and second annular grooves with a cylindrical hole are provided,
• radial leak holes communicating an outside of a cylindrical part with an inside thereof which is opened to the atmosphere are formed in said rotary valve in such a manner as to communicate with said communicating holes of said rotary shaft,
• communicating grooves for communicating said first and second annular grooves with each other are provided in such a manner that said communicating grooves are different in phase from said leak holes formed in said outer wall of said rotary valve and extend substantially parallel to the axis of said rotary valve, and
• said rotary valve rotating relative to said rotary shaft when said centrifugal governor rotates at a predetermined speed, thereby to establish one of a communication condition in which said first and second passages are not opened to the atmosphere and a communication condition in which said first and second are not communicated with each other and said second passage is communicated with the inside of said rotary valve, which is opened to the atmosphere.