Side Air Filter Layout for Compact Hand-Guided Work Tools
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Solution Overview
Problem
Existing work apparatuses, such as motorized chainsaws, are bulky and unwieldy due to the configuration of the air inlet opening, which allows dirt to enter and compromises ergonomic design.
Innovation Solution
A hand-guided work apparatus with an air filter component arranged on a side surface, featuring a longitudinal extent and a tangential plane that intersects with the work tool plane, allowing for a compact and ergonomic design with minimized dirt introduction through a strategically positioned inlet opening and flow path cross sections that decrease in the longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air inlet opening is provided at the side surface parallel to the work tool plane, then sufficient space is available for the user's hand between the bale handle and air filter, but the work apparatus becomes bulky and unwieldy
Solution Approach 1:
The air filter component is arranged at the side surface extending in the longitudinal direction of the work apparatus, utilizing the longitudinal dimension rather than protruding perpendicular to the work tool plane. This dimensional reorientation allows sufficient hand clearance while maintaining a compact overall profile.
2Temperature
If the inlet opening is orientated upward during felling cut, then cooling air can be supplied to the motor, but dirt can penetrate through the inlet opening under gravitational force
Solution Approach 1:
Instead of orienting the inlet opening upward which allows dirt entry, the air filter component is arranged at the side surface extending in the longitudinal direction. This inverted orientation relative to the conventional upward-facing inlet prevents dirt from penetrating under gravitational force while still allowing cooling air to reach the motor through the flow path.
3Volume of moving object
If the air filter component is arranged on the side surface with minimized protrusion, then the design becomes compact and ergonomic, but the flow cross section for cooling air may be reduced
Solution Approach 1:
The inlet space is designed with flow cross sections that become smaller in the longitudinal direction, creating a dynamic flow path that adapts to the compact housing. The inlet opening is arranged to allow cooling air to flow in the longitudinal direction, optimizing the flow path within the constrained space to maintain effective cooling despite the compact 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 apparatus achieves a compact and ergonomic configuration with reduced dirt ingress, improved ergonomics, and efficient cooling, enhancing user comfort and apparatus durability.
Implementation Method 1
an air filter component (12) for filtering cooling air for cooling the motor (7)
Implementation Method 2
the inlet space delimiting a portion of a flow path (26) for the cooling air; the flow path leading from the inlet opening to the motor (7)
Data Source
AI summary
A work apparatus can be set down in a set-down position on a horizontal plane. A side surface connects a cover to a base and delimits the apparatus in the longitudinal direction in the direction perpendicular to the tool plane. A filter component is on the side surface and has a front half which with respect to the longitudinal direction is arranged in front of a back half of the filter's longitudinal extent. An imaginary tangential plane extends, in the set-down position, perpendicularly to the horizontal plane, and is tangent to the side surface only in the region of the filter's longitudinal extent only in the region of the back half of the filter's longitudinal extent and intersects the tool plane in front of the region of the filter's longitudinal extent.