1. A valve cooling device of an internal combustion engine in which engine oil is circulated in a valve that faces a combustion chamber, wherein
the valve includes:
a valve umbrella portion that intakes air from a combustion chamber side or opens and closes an exhaust passage end; and
a valve stem that extends from the valve umbrella portion to a valve operating chamber side,
an inside of the valve stem is formed with
an oil introduction channel which extends so as to be parallel to the valve stem and in which one end is opened in an extended direction of the valve stem and other end reaches an inner portion of the valve umbrella portion; and
an oil lead-out channel which similarly extends so as to be parallel to the valve stem and in which one end communicates with the other end of the oil introduction channel in the valve umbrella portion and other end is opened to an inner portion of the valve operating chamber,
a jet portion that includes a jet oil passage coaxially disposed with the oil introduction channel is provided in the extended direction of the valve stem, and
the engine oil is injected from an orifice provided on a tip portion of the jet oil passage to an inner portion of the oil introduction channel, the tip portion of the jet oil passage being apart from the oil introduction channel.
2. The valve cooling device of an internal combustion engine according to claim 1, wherein
the valve stem includes a hollow stem main body that forms an outer circumferential shape and an inner pipe that is coaxially inserted into the hollow stem main body, and
the oil introduction channel is formed on an inner circumference of the inner pipe, and the cylindrical oil lead-out channel is formed on an outer circumference of the inner pipe and an outer circumference of the hollow stem main body.
3. The valve cooling device of an internal combustion engine according to claim 2,
wherein a sum of concentricity between the inner pipe and the orifice and a diameter of the orifice is smaller than a diameter of an oil introduction port of the oil introduction channel.
4. The valve cooling device of an internal combustion engine according to claim 3,
wherein a diffusion angle \u03b8j of an oil jet stream that is injected from the orifice is expressed by Equation A below when an inner diameter of the inner pipe is dpi, a diameter of the orifice is dj, a distance from the orifice to an inner bottom surface of the valve umbrella portion is H, and a valve maximum lift amount is L,
\u03b8j=tan\u22121{(dpi\u2212dj)2(H+L)}.\u2003\u2003Equation A
5. The valve cooling device of an internal combustion engine according to claim 2,
wherein a diffusion angle \u03b8j of an oil jet stream that is injected from the orifice is expressed by Equation A below when an inner diameter of the inner pipe is dpi, a diameter of the orifice is dj, a distance from the orifice to an inner bottom surface of the valve umbrella portion is H, and a valve maximum lift amount is L,
\u03b8j=tan\u22121{(dpi\u2212dj)2(H+L)}.\u2003\u2003Equation A
6. The valve cooling device of an internal combustion engine according to any one of claims 1 to 5,
wherein a flow channel area of the oil lead-out channel is larger than a flow channel area of the oil introduction channel.
7. The valve cooling device of an internal combustion engine according to any one of claims 1 to 5,
wherein an oil jacket that has an outer diameter larger than an outer diameter of the stem when viewed from an axial direction of the valve stem is formed in the valve umbrella portion.
8. The valve cooling device of an internal combustion engine according to any one of claims 1 to 5,
wherein a gallery for jet is provided between an exhaust cam shaft and an intake cam shaft, and the jet portion is connected to the gallery for jet.
9. The valve cooling device of an internal combustion engine according to any one of claims 1 to 5, wherein a diameter of the jet oil passage is smaller than a diameter of the oil introduction channel.
10. A valve cooling device of an internal combustion engine in which engine oil is circulated in a valve that faces a combustion chamber, wherein
the valve includes:
a valve umbrella portion that intakes air from a combustion chamber side or opens and closes an exhaust passage end; and
a valve stem that extends from the valve umbrella portion to a valve operating chamber side,
an inside of the valve stem is formed with
an oil introduction channel which extends so as to be parallel to the valve stem and in which one end is opened in an extended direction of the valve stem and other end reaches an inner portion of the valve umbrella portion; and
an oil lead-out channel which similarly extends so as to be parallel to the valve stem and in which one end communicates with the other end of the oil introduction channel in the valve umbrella portion and other end is opened to an inner portion of the valve operating chamber,
a jet portion that includes a jet oil passage coaxially disposed with the oil introduction channel is provided in the extended direction of the valve stem, and
the engine oil is injected from an orifice provided on a tip portion of the jet oil passage to an inner portion of the oil introduction channel,
wherein the valve stem includes a hollow stem main body that forms an outer circumferential shape and an inner pipe that is coaxially inserted into the hollow stem main body, and
the oil introduction channel is formed on an inner circumference of the inner pipe, and the cylindrical oil lead-out channel is formed on an outer circumference of the inner pipe and an outer circumference of the hollow stem main body; and
wherein a sum of concentricity between the inner pipe and the orifice and a diameter of the orifice is smaller than a diameter of an oil introduction port of the oil introduction channel.
11. The valve cooling device of an internal combustion engine according to claim 10,
wherein a diffusion angle \u03b8j of an oil jet stream that is injected from the orifice is expressed by Equation A below when an inner diameter of the inner pipe is dpi, a diameter of the orifice is dj, a distance from the orifice to an inner bottom surface of the valve umbrella portion is H, and a valve maximum lift amount is L,
\u03b8j=tan\u22121{(dpi\u2212dj)2(H+L)}.\u2003\u2003Equation A
12. A valve cooling device of an internal combustion engine in which engine oil is circulated in a valve that faces a combustion chamber, wherein
the valve includes:
a valve umbrella portion that intakes air from a combustion chamber side or opens and closes an exhaust passage end; and
a valve stem that extends from the valve umbrella portion to a valve operating chamber side,
an inside of the valve stem is formed with
an oil introduction channel which extends so as to be parallel to the valve stem and in which one end is opened in an extended direction of the valve stem and other end reaches an inner portion of the valve umbrella portion; and
an oil lead-out channel which similarly extends so as to be parallel to the valve stem and in which one end communicates with the other end of the oil introduction channel in the valve umbrella portion and other end is opened to an inner portion of the valve operating chamber,
a jet portion that includes a jet oil passage coaxially disposed with the oil introduction channel is provided in the extended direction of the valve stem, and
the engine oil is injected from an orifice provided on a tip portion of the jet oil passage to an inner portion of the oil introduction channel,
wherein the valve stem includes a hollow stem main body that forms an outer circumferential shape and an inner pipe that is coaxially inserted into the hollow stem main body, and
the oil introduction channel is formed on an inner circumference of the inner pipe, and the cylindrical oil lead-out channel is formed on an outer circumference of the inner pipe and an outer circumference of the hollow stem main body,
wherein a diffusion angle \u03b8j of an oil jet stream that is injected from the orifice is expressed by Equation A below when an inner diameter of the inner pipe is dpi, a diameter of the orifice is dj, a distance from the orifice to an inner bottom surface of the valve umbrella portion is H, and a valve maximum lift amount is L,
\u03b8j=tan\u22121{(dpi\u2212dj)2(H+L)}.\u2003\u2003Equation A
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with an ear canal of a user; and
a tube nipple providing an acoustic pathway through at least one wall of the housing and having a first end and a second end, the first end being located within the housing and being acoustically coupled to the output port of the receiver and the second end being located externally to the housing and being acoustically coupled to the flexible eartip, the tube nipple and housing being configured and arranged to form an obtuse angle between a longitudinal axis of the tube nipple and a vertical axis of the housing where the tube nipple meets the housing, wherein the housing hangs approximately vertically along the side of a user’s head when worn; and
wherein the insert earphone is inserted at least partially into the ear canal and is supported entirely by the ear canal when worn by the user.
2. The insert earphone of claim 1 wherein the angle is approximately 118 degrees.
3. The insert earphone of claim 1 further comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
4. The insert earphone of claim 3 wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.
5. The insert earphone of claim 1 wherein the flexible eartip comprises a flexible tube portion and a foam eartip portion, and wherein at least a portion of the flexible tube portion extends through the foam eartip portion.
6. The insert earphone of claim 5 wherein the tube nipple is rigid and wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
7. The insert earphone of claim 1 further comprising an acoustic damper located in the tube nipple proximate the first end of the tube nipple.
8. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with an ear canal of a user, the flexible eartip having a foam eartip portion and a flexible tube portion;
a rigid tube nipple providing an acoustic pathway through at least one wall of the housing and having a first end and a second end, the first end of the rigid tube nipple being located within the housing and being acoustically coupled to the output port of the receiver and the second end of the rigid tube nipple being located externally to the housing and being acoustically coupled to flexible tube portion of the flexible eartip; and
a flexible channel located between the output port of the receiver and the first end of the rigid tube nipple; and
wherein the insert earphone is inserted at least partially into the ear canal and is supported entirely by the ear canal when worn by the user.
9. The insert earphone of claim 8 wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to the output port of the receiver and the second end of the flexible channel is coupled to the first end of the rigid tube nipple.
10. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with an ear canal of a user; and
a tube nipple providing an acoustic pathway through at least one wall of the housing and having a first end and a second end, the first end being located within the housing and being acoustically coupled to the output port of the receiver and the second end being located externally to the housing and being acoustically coupled to the flexible eartip, the tube nipple and housing being configured and arranged to form an obtuse angle of approximately 118 degrees between a longitudinal axis of the tube nipple and a vertical axis of the housing, wherein the housing hangs approximately vertically along the side of a user’s head when worn.
11. The insert earphone of claim 10 further comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
12. The insert earphone of claim 11 wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.
13. The insert earphone of claim 10 wherein the flexible eartip comprises a flexible tube portion and a foam eartip portion, and wherein at least a portion of the flexible tube portion extends through the foam eartip portion.
14. The insert earphone of claim 13 wherein the tube nipple is rigid and wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
15. The insert earphone of claim 10 further comprising an acoustic damper located in the tube nipple proximate the first end of the tube nipple.
16. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with ear canal of a user;
a tube nipple having a first end and a second end, the first end located within the housing and acoustically coupled to the output port of the receiver and the second end located externally to the housing and acoustically coupled to the flexible eartip, the tube nipple and the housing being configured and arranged to form an obtuse angle of approximately 118 degrees between a longitudinal axis of the tube nipple and a vertical axis of the housing, wherein the housing hangs approximately vertically along the side of a user’s head when worn; and
an acoustic damper located in the tube nipple proximate the first end of the tube nipple.
17. The insert earphone of claim 16 wherein the flexible eartip comprises a flexible tube portion and a foam eartip portion, and wherein at least a portion of the flexible tube portion extends through the foam eartip portion.
18. The insert earphone of claim 17 wherein the tube nipple is rigid and wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
19. The insert earphone of claim 16 further comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
20. The insert earphone of claim 19 wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to the output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.
21. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with an ear canal of a user, the flexible eartip having a foam eartip portion and a flexible tube portion; and
a tube nipple providing an acoustic pathway through at least one wall of the housing and having a first end and a second end, the first end of the tube nipple being located within the housing and being acoustically coupled to the output port of the receiver and the second end of the tube nipple being located externally to the housing and being acoustically coupled to the flexible tube portion of the flexible eartip;
the tube nipple and the housing being configured and arranged to form an obtuse angle between a longitudinal axis of the tube nipple and a vertical axis of the housing, wherein the housing hangs approximately vertically along the side of a user’s head when worn;
wherein the earphone providing a response that is approximately 0 dB relative to a response of the TDH-39 standard at at least one of 6 and 8 khz, and wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
22. The insert earphone of claim 21, wherein the angle is approximately 118 degrees.
23. The insert earphone of claim 21, further comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
24. The insert earphone of claim 23, wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to the output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.
25. The insert earphone of claim 21, further comprising an acoustic damper located in the tube nipple proximate the first end of the tube nipple.
26. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with ear canal of a user;
a tube nipple having a first end and a second end, the first end located within the housing and acoustically coupled to the output port of the receiver and the second end located externally to the housing and acoustically coupled to the flexible eartip;
an acoustic damper located in the tube nipple proximate the first end of the tube nipple,
wherein the insert earphone is inserted at least partially into the ear canal and is supported entirely by the ear canal when worn by the user, and wherein the tube nipple and the housing being configured and arranged to form an obtuse angle between a longitudinal axis of the tube nipple and a vertical axis of the housing where the tube nipple meets the housing.
27. The insert earphone of claim 26, wherein the angle is approximately 118 degrees.
28. The insert earphone of claim 26, wherein the flexible eartip comprises a flexible tube portion and a foam eartip portion, and wherein at least a portion of the flexible tube portion extends through the foam eartip portion.
29. The insert earphone of claim 28, wherein the tube nipple is rigid and wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
30. The insert earphone of claim 26, further comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
31. The insert earphone of claim 30, wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to the output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.