Claims
- 1. An automotive radiator cap for a filler neck of an automotive radiator tank, comprising:
- an outer cap member connected to said filler neck;
- an inner cap member provided on an inner side of said outer cap member and rotatably connected with said outer cap member;
- a first pressure valve operatively coupled to said inner cap member so that said pressure valve can move vertically, said pressure valve facing said inner cap member at one portion of said pressure valve and having a seal portion for sealing said filler neck at an opposite position of said one portion, and having an inner side forming a connecting hole which communicates between an upper space of said pressure valve communicated to a reservoir and a lower space of said pressure valve communicated to said tank;
- a pressure modulating valve operatively coupled to said first pressure valve and having a center rod provided in said connecting hole and spaced from said inner side to form a passing area and having sealing means for closing said connecting hole when said pressure modulating valve moves upwardly upon pressure in said tank becoming higher than a predetermined value,
- said pressure modulating valve operating by virtue of its own weight, when pressure in said tank is below a predetermined value, to open said connecting hole by spacing said sealing means from said connecting hole so as to introduce coolant from said reservoir into said tank;
- an outer diameter of said center rod and a diameter of said inner side decreasing around an axis of said center rod from said lower space of said first pressure valve to said upper space of said first pressure valve to cause said passing area of said connecting hole to decrease from said lower space to said upper space; and
- a coil spring provided between said inner cap member and said first pressure valve so that one end of said coil spring abuts said inner cap member and the other end of said coil spring abuts said first pressure valve toward an opposite direction of said inner cap member, a contacting point between said other end of said coil spring and said first pressure valve being disposed lower than a connecting point between said sealing portion of said first pressure valve and said filler neck.
- 2. An automotive radiator cap as claimed in claim 1, wherein said seal portion of said first pressure is a sealing member adhesively coupled to a surface of said pressure valve at the side opposite to said inner cap member.
- 3. An automotive radiator cap claimed in claim 1, further comprising a spring for forcing said pressure modulating valve to open said connecting hole.
- 4. An automotive radiator cap as claimed in claim 1, wherein said sealing means of said pressure modulating valve is made of thermal reforming material which changes its shape due to the temperature of the coolant within said tank so that said sealing means opens said connecting hole when the temperature of the coolant within said tank is lower than a predetermined temperature and closes said connecting hole when the temperature of the coolant within said tank is higher than a predetermined temperature.
- 5. An automotive radiator cap according to claim 4, wherein said sealing means of said pressure modulating valve is made of a bi-metal.
- 6. An automotive radiator cap according to claim 4, wherein said sealing means of said pressure modulating valve is made of a memory shaped alloy.
- 7. An automotive radiator cap according to claim 1, wherein said sealing means of said pressure modulating valve has a plurality of impellers so that flow passing through said connecting hole rotates said pressure modulating valve.
Priority Claims (4)
Number |
Date |
Country |
Kind |
61-90994 |
Apr 1986 |
JPX |
|
61-171294 |
Jul 1986 |
JPX |
|
61-171295 |
Jul 1986 |
JPX |
|
61-239976 |
Oct 1986 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/039,283, filed Apr. 17, 1987, which was abandoned upon the filing hereof.
US Referenced Citations (15)
Continuations (1)
|
Number |
Date |
Country |
Parent |
39283 |
Apr 1987 |
|