Rotary Motor Triangular Cavities Planetary Piston

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Solution Overview

Problem

Existing rotary motors for compressible media, such as air or steam, suffer from energy losses due to inefficient energy transfer and complex structures, leading to high energy consumption and short lifespan of mechanical parts.

Innovation Solution

A rotary motor design with a stator featuring triangular cavities and elliptical rotary pistons, where the pistons are eccentrically positioned to achieve planetary movement, allowing for direct transfer of gyroscopic moment through a geared elliptical rotary element, minimizing friction and maximizing energy use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a crank mechanism with reversible piston is used, then the motor can convert compressible media energy to rotational motion, but energy losses occur at change of direction of the piston

Engineering Contradiction:
Improveenergy transfer efficiencyVSAvoidenergy loss at direction change
Core Design Contradiction:
PowerVSLoss of energy

Solution Approach 1:

The motor divides the rotational path into multiple sectors with pistons operating at different phases. Each piston operates independently in its own chamber, allowing continuous energy transfer without the need for a single piston to reverse direction. The segmentation of the crank mechanism into multiple offset cranks, each driving separate pistons, eliminates the energy loss associated with direction reversal.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The motor employs periodic action by having multiple pistons operate in a cyclic sequence with phase differences. As one piston completes its power stroke, another is beginning its power stroke, creating a continuous periodic energy transfer to the crankshaft. This periodic overlapping of power strokes ensures smooth rotational motion without energy loss from direction changes.

Inventive Principle:
Principle #19Periodic action

2Productivity

If eccentric mounting of rotor with movable seal lamellas is used, then rotary motion is achieved, but not the whole path of rotation is used for energy transfer and high consumption of compressible media occurs

Engineering Contradiction:
Improveenergy transfer utilizationVSAvoidcompressible media consumption
Core Design Contradiction:
ProductivityVSUse of energy by moving object

Solution Approach 1:

The motor segments the rotation path into multiple active zones, each containing pistons that perform work. Instead of a single eccentric rotor with seal lamellas, multiple pistons are distributed around the circumference, each utilizing a portion of the pressure wave. This segmentation ensures that the entire rotation path contributes to energy transfer, maximizing productivity while reducing media consumption.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The motor achieves continuity of useful action by overlapping the power strokes of multiple pistons. As compressible media expands in one chamber, it simultaneously drives other pistons in different phases. This continuous overlapping ensures that useful work is performed throughout the entire rotation cycle, eliminating dead zones and maximizing the utilization of the compressible media's energy.

Inventive Principle:
Principle #20Continuity of useful action

3Productivity

If systems with two or more shaped rotors forming variable flexible work spaces are used, then rotary motion is achieved, but big areas with necessity to be sealed and bigger total weight are required

Engineering Contradiction:
Improveenergy transfer capabilityVSAvoidmotor weight
Core Design Contradiction:
ProductivityVSWeight of stationary object

Solution Approach 1:

The motor segments the sealing requirements into multiple smaller, localized areas around the piston chambers rather than requiring large sealed areas for variable work spaces. Each piston chamber is independently sealed, allowing for more compact and lighter construction while maintaining effective energy transfer capability.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The motor merges multiple piston chambers and crank mechanisms into a single integrated unit sharing common structural elements such as the cylinder block and crankshaft. This consolidation reduces the total weight compared to separate rotor systems while maintaining the ability to transfer energy effectively through the combined action of multiple pistons.

Inventive Principle:
Principle #5Merging (Combining)

4Productivity

If systems with rotary pistons connected with two or more eccentric pegs controlled with cogs are used, then the whole path of rotation is used for energy transfer, but higher structural complexity and production demandingness occur

Engineering Contradiction:
Improveenergy transfer path utilizationVSAvoidstructural complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The motor merges multiple eccentric crank mechanisms into a single integrated crankshaft structure with offset journals. Instead of separate eccentric pegs and cogs for each piston, the design combines them into one unified rotating component where each crank journal corresponds to one piston. This merging maintains full utilization of the rotation path for energy transfer while dramatically reducing structural complexity and the number of moving parts.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The crankshaft serves multiple functions simultaneously: it converts the reciprocating motion of all pistons into rotational motion, provides the necessary eccentricity for each piston's phase difference, and transmits power to the output. This multi-functionality eliminates the need for separate eccentric pegs and control cogs, simplifying the overall structure while maintaining effective energy transfer throughout the rotation path.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design achieves high operational efficiency, reduces energy consumption, and extends the lifespan of mechanical parts by utilizing the full path of rotation for energy transfer and eliminating dead motions, while simplifying the structure for easier production and reduced noise pollution.

Implementation Method 1

canal for entry and exit of compressible medium

Methodology Applied
Scientific EffectCompression and expansion of compressible media: Compression

Implementation Method 2

rotary piston with an elliptical crosscut... displaced regarding to lengthwise axis of the inner cavity... in order to reach a planetary movement of the rotary piston

Methodology Applied
Scientific EffectPlanetary movement mechanism: Epicyclic Gearing

Implementation Method 3

direct transfer of gyroscopic moment through a geared elliptical rotary element

Methodology Applied
Scientific EffectGyroscopic moment transfer: Angular Momentum

Implementation Method 4

geared elliptical rotary element which is connected with the driven mechanism

Methodology Applied
Scientific EffectGeared transmission: Gear

Data Source

PatentEP3074595B1Rotary motor with geared transmission for use of compressible media drive
Publication Date: 2017.11.15 DVORAK JIRI
  • EP3074595B1 patent drawingFigure 1
  • EP3074595B1 patent drawingFigure 2
  • EP3074595B1 patent drawingFigure 3~4

AI summary

A rotary motor with a geared transmission for use of compressible media drive which contains a stator (1) which is procured with at least one, preferably two, triangular cavities (12) which are sealed to surrounding environment and which are procured with rounded peaks (121) from which into each is led in at least one canal (41) for entry and exit of compressible medium where in each cavity (12) is embedded a rotary piston (2) with en elliptical crosscut in the way that its lengthwise axis (Op) which is parallel with an axis (Oc) of a rotary element (7) is displaced regarding to a lengthwise axis (Os) of the inner cavity (12) of the stator (1) of a value of eccentricity (e) in order to reach a planetary movement of the rotary piston (2) namely during the displacement of the lengthwise axis (Op) of the rotary piston (2) along a circle with radius of the eccentricity (e) where the essence of the invention is in the fact that the mutual coupling of the rotary pistons (2) with a driven mechanism (9) is achieved by led out of following pins (21) of the rotary pistons (2) out of the cavities (12) of the stator (1) where they are procured with rotary cog wheels (6) which are mutually coupled with the geared elliptical rotary element (7) which is connected with the driven mechanism (9).