Location History:
- Yokohama, JA (1977)
- Yokohama, JP (1979 - 1983)
- Yokosuka, JP (1988 - 1991)
Company Filing History:
Years Active: 1977-1991
Title: Shigeo Muranaka: Innovator in Variable Valve Timing Technology
Introduction
Shigeo Muranaka is a prominent inventor based in Yokosuka, Japan. He has made significant contributions to the automotive industry, particularly in the field of variable valve timing technology. With a total of 15 patents to his name, Muranaka's innovations have played a crucial role in enhancing engine performance and efficiency.
Latest Patents
Muranaka's latest patents include a rocker arm arrangement for variable valve timing type internal combustion engines. This innovative design features a rocker arm that is pivotally mounted on a rocker shaft. A first cam follower, such as a roller, is provided on the rocker arm and is arranged to cooperate with a low-speed cam. Additionally, a second cam follower is reciprocally mounted on the rocker arm and is designed to work with a high-speed cam. The locking arrangement for selectively locking the second cam follower in place comprises three plungers, each reciprocatively received in their own bore. This mechanism ensures optimal performance under varying engine conditions.
Another notable patent is the rocker arm arrangement for variable timing valve trains. This design ensures that, in the absence of sufficient hydraulic pressure to operate the interlocking mechanisms, the system defaults to a cam follower suited for low-speed engine operation. This feature improves aspiration during engine starts and reduces the likelihood of incomplete combustion, which can lead to smoldering deposits on spark plug electrodes. In the event of a hydraulic system malfunction, this defaulting mechanism allows the engine to produce enough torque to keep the vehicle drivable.
Career Highlights
Muranaka is currently employed at Nissan Motor Company Limited, where he continues to innovate and develop advanced automotive technologies. His work has significantly impacted the efficiency and performance of modern engines, making him a valuable asset to the company.
Collaborations
Throughout his career, Muranaka has collaborated with notable colleagues, including Yutaka Matayoshi and Shigeru Kamegaya. These collaborations have fostered a creative environment that has led to groundbreaking advancements in automotive engineering.
Conclusion
Shigeo Muranaka's contributions to variable valve timing technology have established him as a leading inventor in the automotive industry. His innovative designs and patents continue to influence engine performance and efficiency, showcasing the importance of his work in modern automotive engineering.