Integrated Drill Gear Unit Layout for Shaft Rigidity and Sealing
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Solution Overview
Problem
Existing drill units face issues with motor drive shaft bending, high manufacturing costs, and large size and weight, which affect efficiency and durability.
Innovation Solution
A compact drill unit design integrating a motor unit and a gear unit with a single wall part separating the motor and gear units, reducing parts and material usage, and incorporating a sealing system and bearing arrangements to enhance rigidity and sealing, while a cooling fan and lubrication system improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor drive shaft length is reduced to lower bending risk, then reliability improves, but the gear unit cavity cannot accommodate necessary components
Solution Approach 1:
The motor unit housing is nested within the gear unit housing, with the motor unit housing positioned inside the gear unit cavity. This nested arrangement allows the motor drive shaft to be shorter while still providing sufficient space for gear components, as the motor housing itself occupies part of the cavity space that would otherwise be unused.
Solution Approach 2:
The motor unit housing and gear unit housing are merged into a single integrated structure, where the motor unit housing forms part of the gear unit housing assembly. This merging eliminates the need for separate housings and reduces the overall length of the motor drive shaft while maintaining adequate gear unit cavity volume.
2Strength
If multiple wall parts are used to separate motor and gear units, then structural strength improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The motor unit housing and gear unit housing are merged into a single integrated structure that provides both separation and structural strength. This single housing structure eliminates the need for multiple separate wall parts while maintaining the necessary structural integrity through its integrated design.
Solution Approach 2:
The motor unit housing serves multiple functions: it houses the motor, provides structural support, separates the motor from the gear unit cavity, and forms part of the overall gear unit housing. This multi-functionality reduces the number of separate components needed while maintaining structural strength.
3Weight of moving object
If the drill unit size is reduced, then weight and manufacturing cost decrease, but sealing between motor unit and gear unit becomes more difficult
Solution Approach 1:
The motor unit housing and gear unit housing are merged with integrated sealing features, where sealing flanges and gaskets are built into the housing structure itself. This integration maintains effective sealing while reducing the overall size and weight of the drill unit by eliminating separate sealing components.
Solution Approach 2:
A flexible sealing gasket is used at the interface between the motor unit housing and gear unit housing. This flexible gasket provides effective sealing in a compact arrangement, maintaining reliability while allowing for reduced overall dimensions and weight of the drill unit.
Data Source
AI summary
The present disclosure relates to a drill tool (1), such as a core drill tool (1), comprising a motor unit (2) and a gear unit (3). The motor unit (2) comprises an electric motor (4) and a motor drive shaft (5) that extends along a first longitudinal axis (6) from the electric motor (4) and protrudes out of a motor unit housing (7) via a motor exit aperture (8) in a housing end part (9) and comprises a drive shaft gear (10). The drive shaft gear (10) is adapted to propel a drill shaft (14) that extends along a second longitudinal axis (15) and comprises a tool holder (16) that is adapted to hold a tool. The housing end part (9) comprises a wall part (17) arranged transversally to the longitudinal axes (6, 15) and is adapted to close the gear unit cavity (11) and to separate the electric motor (4) from the gear unit cavity (11).