The innovative "Schulze Crank Drive"
The innovative Schulze Crank Drive®
Patent No.: DE 10 2015 006 964
As early as 1570, Girolamo Cardano described: If a circle rolls inside a circle having double its radius, then every point of the small circle moves in a straight line on a diameter of the large circle.
This basic principle, known as the "Cardan circles" or the term "hypocycloid straight line motion", is all but forgotten.
Patent No.: DE 10 2015 006 964
As early as 1570, Girolamo Cardano described: If a circle rolls inside a circle having double its radius, then every point of the small circle moves in a straight line on a diameter of the large circle.
This basic principle, known as the "Cardan circles" or the term "hypocycloid straight line motion", is all but forgotten.
This straight line motion offers the possibility to build a crank drive that (like the crosshead engine) allows use of both sides of the piston, since the space between the piston and the crankcase can be sealed. These ideas are not new and have few, mostly unsuccessful, trials and patents. The design implementation shown here promises to be successful and opens numerous new opportunities.
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The sketches show the conventional crank drive, the crosshead engine and a crank drive according to the hypocycloid straight line principle.
The entire crank drive is constructed in the modular principle
The housing in the basic version consists of only four different, reversibly assembled, pairs of square segmented disks, arranged in mirror symmetry. These form the contact or bearing points for the parts found inside the housing. They are screwed together using tie rods and can easily be replaced due to wear or failure. Also, the disks can be replaced by stronger or weaker sized disks as the requirements change. In addition there are two planetary gears, the crankshaft and the push rod. Tilting is eliminated due to the axially symmetrical design.
The housing in the basic version consists of only four different, reversibly assembled, pairs of square segmented disks, arranged in mirror symmetry. These form the contact or bearing points for the parts found inside the housing. They are screwed together using tie rods and can easily be replaced due to wear or failure. Also, the disks can be replaced by stronger or weaker sized disks as the requirements change. In addition there are two planetary gears, the crankshaft and the push rod. Tilting is eliminated due to the axially symmetrical design.
Applications
The Schulze crank drive is suitable for numerous applications, such as:
The Schulze crank drive is suitable for numerous applications, such as:
- Single and multi-stage piston compressors and vacuum pumps, hydraulic pumps, combustion engines with compressors for power increase without turbo lag.
- Sorting and portioning machines, saws, fixing equipment, various applications in control technology, windshield wiper drives, steering gears, thread guide for changing spooled goods.