Integrated Cam-Lobe Radial Piston Unit for Compact Assembly
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Solution Overview
Problem
Radial piston units in the art have relatively high axial and radial dimensions, which complicates integration into vehicle frames, and require complex assembly and high manufacturing costs due to multiple parts and tight machining tolerances.
Innovation Solution
A hydrostatic radial piston unit design with an integrally formed cam-lobe surface and a single-piece front casing, combined with a stationary or rotary shaft configuration, reduces axial and radial dimensions, simplifies assembly, and minimizes machining requirements by eliminating separate components and connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple separate components are used in radial piston units, then assembly flexibility is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The cam-lobe surface and front casing are merged into a single integrally formed component. This eliminates the need for separate cam-lobe surfaces and reduces the number of parts, directly addressing the contradiction by maintaining assembly flexibility while reducing device complexity and manufacturing cost.
2Manufacturing precision
If tight machining tolerances are applied to multiple parts, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
By integrating the cam-lobe surface into the front casing as a single component, the number of mating surfaces and connections requiring tight tolerances is reduced. This integral design maintains necessary precision while significantly reducing manufacturing cost by eliminating multiple precision-machined interfaces.
3Strength
If multiple connection points and seals are used, then structural integrity is improved, but reliability decreases due to leakage points
Solution Approach 1:
The integral formation of the cam-lobe surface and front casing eliminates separate connection points and seals between these components. This reduces the number of potential leakage points while maintaining structural integrity through the monolithic construction, directly resolving the contradiction between strength and reliability.
4Force
If radial piston units have high axial and radial dimensions, then torque capacity is improved, but adaptability to vehicle frame integration decreases
Solution Approach 1:
The patent explores alternative shaft configurations (stationary vs. rotary) and casing arrangements to optimize the spatial distribution of components. By rethinking the dimensional arrangement and allowing the shaft to be stationary while the front casing rotates, the design achieves better compactness and adaptability for vehicle frame integration while maintaining torque capacity.
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
The design achieves reduced dimensions, cost-effective manufacturing, and robust operation with fewer assembly steps and potential leakage points, while maintaining high torque output.
Implementation Method 1
pressurized hydraulic fluid in case of a radial piston motor
Implementation Method 2
pressurized hydraulic fluid... to generate a force on the head of the working piston
Implementation Method 3
The front casing comprises an internal cam-lobe surface... the movement of the working pistons radially outwards generates a force on the cam-lobe surface which causes a relative rotation between the front casing and the cylinder block
Implementation Method 4
The sealing between the front casing and the stationary rear casing is executed in such a manner that both casings form a closed fluid-tight cavity
Implementation Method 5
a pair of roller bearings supports the rotary front casing against the stationary rear casing
Data Source
AI summary
A hydrostatic radial piston unit of the cam-lobe type of construction including a shaft defining a rotational axis of the hydrostatic radial piston unit. The shaft extends with a front end region from a non-rotary, stationary rear casing to a front casing. Within the front casing a cylinder block is housed and fixed in a torque-proof connection to the front end region of the shaft. In the cylinder block radially reciprocating working pistons are disposed in radially oriented cylinder bores to and from which cylinder bores hydraulic fluid can be conducted by means of a distributor. The distributor is arranged rotationally fixed with respect to the front casing and rotationally free relative to the shaft. A circumferential cam-lobe surface with which the working pistons can interact, is formed integrally with the front casing on its radial inner side.