Location History:
- Hartland, WI (US) (1993)
- Delafield, WI (US) (1998)
- Bonita Springs, FL (US) (2016 - 2021)
Company Filing History:
2 out of 4 
2 out of 832,891 Years Active: 1993-2021
Title: The Innovative Contributions of Donald G Bethke
Introduction
Donald G Bethke is a notable inventor based in Hartland, WI (US). He has made significant contributions to the field of engineering, particularly in the design and control of axial piston pumps. With a total of 4 patents to his name, Bethke's work showcases his expertise and innovative spirit.
Latest Patents
One of his latest patents is the "Electro-hydraulic swashplate control arrangement for an axial piston pump." This invention involves a control arrangement that manages the position of a swashplate in an axial piston pump, allowing it to transition between a no-stroke position and a maximum stroke position. The system includes a servo spool that moves within a compensator piston cylinder, driven by a solenoid coil that generates a force to shift the spool. A compensator piston responds to this movement, while a spring provides a balancing force, creating a feedback system that enables precise control of the swashplate position.
Another significant patent is the "Holddown system for an axial piston pump." This design features a housing with a cover plate assembly and a rotor equipped with reciprocable pistons. The swashplate assembly is tiltably mounted relative to the drive shaft, and a holddown spring is integrated within the assembly. This spring applies a force that keeps the piston outer ends pressed against the swashplate assembly, ensuring efficient operation of the pump.
Career Highlights
Throughout his career, Donald G Bethke has worked with various companies, including Hartmann Controls, Inc. His experience in these organizations has contributed to his development as an inventor and has allowed him to refine his innovative ideas.
Collaborations
Due to space constraints, the details of collaborations will not be included.
Conclusion
Donald G Bethke's contributions to the field of engineering, particularly in axial piston pump technology, highlight his innovative capabilities and dedication to advancing mechanical design. His patents reflect a deep understanding of control systems and their applications in modern engineering.