Thomas J Bubula is a notable inventor based in Joliet, IL (US). He has made significant contributions to the field of hydrostatic transmission technology, holding a total of 3 patents. His work has been instrumental in advancing the efficiency and functionality of drive train systems.

Latest Patents

One of his latest patents focuses on controls for combined hydrostatic and multiple speed range transmission. This innovative drive train includes a hydrostatic transmission unit and a multiple speed range transmission unit arranged in series between a prime mover and a primary output shaft. The variable displacement and torque transmitting capacity of the hydrostatic transmission unit are adjusted by hydraulic controls. These controls include a speed control valve that develops a differential pressure signal proportional to a desired rate of operation. Additionally, a modulating valve regulates the differential pressure signal corresponding to the accelerating and decelerating operation of the transmission. A directional control valve determines the direction of operation of the hydrostatic transmission unit, while a range selector valve shifts the operating speed range of the multiple speed range transmission as the hydrostatic transmission approaches a limit of displacement. The displacement of the hydrostatic transmission is automatically reset in response to shifting of the multiple speed range transmission. Operating speed limits are established for the drive train by an override speed control valve, which manually adjusts the differential pressure signal for reduced torque transmission when the prime mover operates below a minimum speed. Furthermore, a speed limiting control valve responds to operation of the prime mover above a maximum selected speed, automatically applying a brake within the drive train to supplement dynamic braking capacity.

Career Highlights

Thomas J Bubula has had a distinguished career at Caterpillar Tractor Co., where he has applied his expertise in hydrostatic transmission technology. His innovative designs and patents have contributed to the company's reputation for excellence in engineering and manufacturing.

Collaborations

Throughout his career, Thomas has collaborated with notable coworkers such as Maurice F Franz and Gordon W Johnson. These partnerships have fostered an environment of innovation and creativity, leading to advancements in their respective fields.

Conclusion

Thomas J Bubula is a prominent inventor whose work in hydrostatic transmission technology has made a lasting impact. His patents and contributions continue to influence the industry, showcasing his dedication to innovation and engineering excellence.

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