Donald Mark Purcell

Title: Innovating Transmission Technologies: The Contributions of Donald Mark Purcell

Introduction

Donald Mark Purcell is a notable inventor based in Pittsfield, MA, whose work in the field of hydrostatic transmission has made a significant impact on engineering solutions. With one patented innovation to his name, he continues to push the boundaries of technology and design.

Latest Patents

Purcell's patent, titled "Continuously Variable Hydrostatic Transmission with Neutral-Setting," presents a novel approach to hydraulic transmission systems. This invention encompasses a continuously variable hydrostatic transmission that features axially aligned input and output shafts. These shafts are journaled by a transmission housing and connected respectively to a prime mover and a load. The innovative design includes a hydraulic pump unit driven by the input shaft, while a hydraulic motor unit is grounded to the housing, ensuring efficient power transmission. A wedge-shaped swashplate connected to the output shaft facilitates the exchange of pressurized hydraulic fluid between the two units. Additionally, the invention incorporates a controller that adjusts the swashplate's angular orientation, allowing for variable transmission ratios. This is further enhanced by a hydraulic circuit that enables venting high and low fluid pressure sides of the swashplate to atmosphere, effectively imposing a neutral transmission ratio condition.

Career Highlights

Donald Mark Purcell is affiliated with Martin Marietta Corporation, where his contributions to engineering and transmission technologies are recognized. Through his work, he has showcased a commitment to innovation and excellence in the field of mechanical engineering.

Collaborations

Throughout his career, Purcell has collaborated with fellow inventor Robert Francis Larkin. Together, they have contributed valuable expertise and insight into the development of advanced hydraulic systems.

Conclusion

Donald Mark Purcell's innovative patent in hydrostatic transmission technology exemplifies the ingenuity present in the engineering community. His work not only enhances the capabilities of hydraulic systems but also sets a precedent for future inventions in this area. As engineers continue to innovate, the contributions of inventors like Purcell remain pivotal in shaping the future of technology.