Tangential Piston Hydraulic Motor with Integrated Planetary Gear
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Solution Overview
Problem
Conventional hydraulic motors and pumps with radial or axial pistons face challenges in space efficiency and mechanical efficiency due to the need for external reduction gears, which increase space and manufacturing costs, and reduce power transmission efficiency.
Innovation Solution
The design features tangential pistons arranged relative to the rotation axis, allowing for internal free space and using planetary or ordinary gearings to transmit torque, with multiple sub-assemblies and braking devices for efficient hydraulic distribution and braking, enabling high-speed and high-torque operations while minimizing radial size and maximizing digging depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional radial or axial piston motors are used, then high operating torques and pressures can be achieved, but the radial size increases and internal space is reduced due to the need for external reduction gears
Solution Approach 1:
The patent merges the motor function with the reduction gear function into a single integrated unit. The planetary reduction gear is positioned internally within the motor housing, combining the piston assembly and gear train into one compact structure. This eliminates the need for separate external reduction gears, reducing overall radial size while maintaining high torque output capability.
Solution Approach 2:
The reduction gear mechanism is nested within the motor housing structure. The planetary gears are arranged concentrically around the piston assembly, with the sun gear aligned with the piston shaft. This nested configuration allows the gear train to occupy the central space within the motor, maximizing space utilization and minimizing external dimensions.
2Force
If external reduction gears are added to increase torque, then operating torque is improved, but manufacturing costs and device complexity increase
Solution Approach 1:
The motor and reduction gear are merged into a single integrated assembly. The piston shaft directly connects to the sun gear of the planetary gear system, eliminating the need for separate coupling mechanisms. This integration reduces the total number of components and simplifies manufacturing while maintaining the torque multiplication function.
3Force
If external reduction gears are used, then torque is increased, but power transmission efficiency decreases due to dispersion of power
Solution Approach 1:
The direct integration of the piston shaft with the sun gear minimizes power transmission path length and reduces the number of intermediate coupling points. This direct connection reduces mechanical losses and improves power transmission efficiency compared to external gear arrangements where power must be transmitted through additional shafts and bearings.
Solution Approach 2:
The planetary gear arrangement distributes power transmission through multiple planet gears simultaneously engaging with the sun and ring gears. This multi-path power transmission in the radial dimension reduces the load on any single transmission path, minimizing energy losses and improving overall efficiency.
4Force
If the motor is positioned on the side of the axis for torque transmission, then torque output is achieved, but space efficiency is reduced and internal equipment arrangement is limited
Solution Approach 1:
The planetary reduction gear is nested within the motor housing, with the sun gear aligned with the piston shaft and planet gears arranged radially around it. This nested configuration creates a compact internal arrangement that maximizes the use of available space while maintaining torque transmission capability, allowing other equipment to be positioned in the annular space between the planet gears and housing.
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 configuration reduces the radial size of hydraulic motors, enhances mechanical efficiency, and allows for larger piston displacements and variable torque and speed adjustments, addressing the limitations of conventional motors by creating internal space for other equipment and improving stability and performance in drilling applications.
Implementation Method 1
hydraulic motors or pumps... adapted to convert the alternating motion of the pistons into the rotatory motion of the shaft with very high operating torques and pressure
Implementation Method 2
Said pistons act on shafts that are arranged in a planet position with respect to the driving shaft and, in turn, transmit said torque by means of gearings, which can be of the ordinary or planetary type
Data Source
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AI summary
A hydraulic motor or pump consisting of a certain number of eccentric shafts arranged in a planet position with respect to the output shaft, which are subject to the action of two propelling members for each shaft, which are arranged in a tangential position with respect to the output shaft and act on intermediate fixed parts, which are also arranged in a planet position and are alternated with the shafts. Said propelling members receive, in an alternate manner, through the fixed parts, the flow of pressurized fluid, which is regulated by rotatory openings, which, based on the expansion or shrinkage phase, connect the propelling members to the pressure circuit or to the discharge one. The motor according to the present invention can be connected, through the eccentric shafts, to gearings that can be of the ordinary or planetary type, but always present planets acting as driving gear and and can have one or two driven gears for one or two degrees of freedom. The invention including the gearing presents an actual piston displacement and one or two different equivalent piston displacements (which can be further subject to fractionization). Therefore, the shape of the motor is annular, if it is complete and closed, or sectoral, if it is open; in any case, there always is a circular open space available inside the motor for all the possible needs of the different applications. The number of the planet shafts has no limits, since they independently transmit the torque, thus allowing annular shapes of any size.