Impact Tool Grease Supply Path for Lubricity
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Solution Overview
Problem
Conventional impact tools experience loss of lubricity due to grease being removed between the spindle and hammer during impact operations, leading to reduced effectiveness of the impact mechanism.
Innovation Solution
The impact tool incorporates a grease supply path that communicates between the spindle and the hammer's inner peripheral portion, ensuring continuous lubrication by providing a reliable grease supply to the inner surfaces, even during hammer movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the hammer is slid in an axial direction along the spindle during impact generation, then the impact force is effectively transmitted, but grease is removed between the outer peripheral portion of the spindle and the inner peripheral portion of the hammer, causing loss of lubricity
Solution Approach 1:
The grease supply path is established in advance within the spindle structure, allowing grease to be proactively supplied to the inner peripheral portion of the hammer before lubricity is completely lost. This preliminary provision of lubrication prevents the harmful effect of grease removal during impact operations.
Solution Approach 2:
The grease supply path acts as an intermediary mechanism that introduces grease into the contact area between the spindle and hammer. This intermediary system compensates for the grease that is removed during hammer sliding, maintaining continuous lubrication without interfering with the impact force transmission.
2Reliability
If grease is contained in the hammer case to lubricate various components, then lubrication is provided, but the grease supply to the inner peripheral portion of the hammer is insufficient when the hammer moves axially
Solution Approach 1:
The grease supply system is segmented into multiple pathways: the general grease in the hammer case for overall lubrication, and a dedicated grease supply path within the spindle specifically targeting the inner peripheral portion of the hammer. This segmentation ensures that hammer movement is not restricted while adequate lubrication is maintained at critical contact points.
Solution Approach 2:
Different regions of the hammer are provided with different lubrication qualities. The inner peripheral portion, which experiences high friction during axial movement, receives targeted grease supply through the spindle's grease supply path, while other areas rely on the general grease reservoir. This local quality enhancement maintains lubrication effectiveness without impeding hammer operation.
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 solution maintains good lubricity within the impact tool, ensuring consistent performance and reducing wear on components by consistently supplying grease to the inner peripheral portions of the hammer.
Implementation Method 1
grease is contained in a hammer case housing the impact mechanism to lubricate various components of the impact tool
Data Source
AI summary
An impact driver includes a motor, a spindle rotated by the motor, a hammer that is movable forward and rearward with respect to the spindle and that has an inner peripheral portion facing the spindle, and an anvil struck in a rotational direction by the hammer. A grease supply path is provided to supply grease to the inner peripheral portion of the hammer.