Hydrostatic Bearing Arrangement for Chain Saw Oscillatory Motion
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Solution Overview
Problem
Existing chain saw bearing arrangements for crosscutting timber face challenges in providing efficient oscillatory motion without external components, requiring complex designs and space-consuming parts, and struggle to maintain low friction under high pressures and stresses.
Innovation Solution
A turnable bearing arrangement using hydrostatic pressure between perforated discs to create a low-friction oil film, allowing for a compact and efficient oscillatory motion in a chain saw, activated by a hydraulic control valve and fluid flow, eliminating the need for external components like piston-cylinder arrangements and gear wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional piston-cylinder arrangements and gear wheels are used to provide oscillatory motion, then the chain saw can achieve crosscutting motion, but the device complexity and space requirements increase significantly
Solution Approach 1:
The invention extracts and eliminates the need for external piston-cylinder arrangements and gear wheels by integrating the oscillatory motion generation directly into the bearing arrangement through hydrostatic pressure applied to a turnable part, thereby removing complex external components while maintaining the crosscutting oscillatory motion capability
Solution Approach 2:
The invention replaces traditional mechanical transmission components (piston-cylinder arrangements and gear wheels) with a hydrostatic bearing system that uses fluid pressure to directly induce oscillatory rotation, substituting complex mechanical systems with a streamlined hydraulic-mechanical integration
2Device complexity
If traditional bearing arrangements are used, then the chain saw structure is simple, but friction increases under high pressures and stresses during oscillatory motion
Solution Approach 1:
The invention applies hydrostatic pressure through hydraulic fluid to the bearing surfaces, creating a pressurized fluid film that separates moving parts and reduces friction during oscillatory motion, thereby maintaining reliability under high pressure while preserving structural simplicity
Solution Approach 2:
The invention changes the physical state and pressure parameters of the hydraulic fluid in the bearing arrangement to optimize the lubrication film characteristics, ensuring low friction performance under varying operational pressures and stresses without complicating the overall structure
3Volume of moving object
If compact bearing arrangements are implemented, then space requirements are reduced, but maintaining low friction under high pressure becomes more difficult
Solution Approach 1:
The compact bearing arrangement utilizes hydrostatic pressure to generate sufficient lubrication film thickness despite reduced dimensions, using fluid pressure to maintain separation between bearing surfaces and ensure low friction performance in a space-efficient design
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 solution enables a compact, efficient, and low-friction oscillatory motion for chain saws, reducing complexity and space requirements while maintaining performance under high pressures and stresses, enhancing handling and cutting efficiency.
Implementation Method 1
adjusted to interact with each other via an oil film, generated primarily by hydrostatic pressure in order to provide for low friction between the sliding or bearing surfaces
Implementation Method 2
provide for low friction between the sliding or bearing surfaces of a given stator part during their relative displacement
Data Source
Figure 1~4
Figure 5~8
Figure 9~13
AI summary
The present invention partly relates to an arrangement and partly a bearing arrangement (10) that can be turned by an assigned hydraulic pressure and flow, which bearing arrangement is related to a chain saw arrangement (101:1), which is supported by a harvesting unit (100) for crosscutting of timber (103) and the like, wherein the bearing arrangement (10) is arranged for said chain saw and is oriented between a guide bar housing (2') for the chain saw and the chain saw's drive motor unit (3), wherewith an oscillatory (or swinging) motion ("S") can be activated by a hydraulic control valve (36), through which the hydraulic flow is alternatively controlled via feed or connection lines (13a, 13b) to said bearing arrangement (10), for a first or second function or operating mode ("R1"; "R2"). The invention provides, more specifically, that said arrangement (10) is activated via hydrostatic pressure and coordinated on the one hand with the guide bar housing (2'), and on the other hand with a drive motor unit (3) or similar device, via surrounding perforated discs (11, 12, 13, 14) that are oriented in parallel and aligned around an axis of rotation (15') for a drive shaft. The hydrostatic pressure is able to affect the arrangement's oscillatory motion ("S") for a reciprocal motion pattern, while, at the same time, the spent hydraulic oil will serve as a lubricating film between the opposing sliding or bearing surfaces (110-116).