Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Technology Category/Market
Technology: valve operating mechanism;
Industry: Automotive, Applications: Engines, Energy;
Market: The global control valves market is projected to grow at a CAGR of 6.6% during 2021 to 2027;
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Problem Statement
- Generally, it is noted that the changing the opening & closing times and lifts of the valves at various operating speeds can enhance the fuel efficiency & reduced emission.
- Based on prior arts discussion, several means of controlling the timing and lift of valves have been proposed, however the IC engines are very limited due to difficulties in manufacturing, assembly, size constraints & cost.
- Further, said prior art actuation mechanism are limited to external or active means.
- Hence there is a need to address above issues.
Technology
- The present invention describes a valve operating mechanism for varying the length of a valve stem of the valve.
- The valve operating mechanism comprises:
- a) a valve; b) a telescopically extendable valve stem, c) a cam, d) a camshaft for rotating said cam about an axis, e) a centrifugal governor fitted over the camshaft & actuated by angular velocity of the camshaft, f) a lever means actuated by said centrifugal governor cam shaft speed, g) a link means associated operably with lever means to correspondingly actuate the telescopically extendable valve stem.
- Said mechanism characterized in the arrangement that the extension length of valve stem is a function of cam shaft speed. (Refer Fig.1)
- The lever means is connected to the valve stem with a pin, wherein the pin is mounted on a rotatable collar, thereby allowing relative rotation between the two telescoping parts of the valve.
Key Features/Value Proposition
Technical Perspective
Modification in the valve stem configures the valve operating mechanism extensible during operation, which facilitates said product to be used by the auto company.
Industrial Perspective
Enhanced Fuel efficiency & emission norms have been steadily narrowed, which fulfils the industry demand.
Questions about this Technology?
Contact for Licensing
Research Lab
Prof. Srikanth Vedantam
Department of Engineering Design
Prof. Anand T N C
Department of Mechanical Engineering,
Intellectual Property
IITM IDF Ref. 1285;
Patent No: 349087
Technology Readiness Level
TRL- 3/4
Proof of Concept ready, validated