Integrated Driver-Drill Chuck Structure for Shorter Length and Low Runout
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Solution Overview
Problem
Existing driver-drills have a long overall length due to a separate drill chuck mounted on the spindle, and they suffer from poor runout accuracy because only the spindle is supported by a bearing.
Innovation Solution
The driver-drill design integrates the spindle with the chuck body, with the chuck body being directly supported by a bearing, allowing for improved runout accuracy and a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drill chuck is mounted as a separate body on the front end portion of the spindle, then the chuck can be easily replaced and adjusted, but the overall length of the driver-drill becomes relatively long in the axial direction
Solution Approach 1:
The chuck body is integrated with the spindle to form a single unified structure. The chuck body includes a chuck portion with chuck jaws and a spindle portion that is directly supported by a bearing, eliminating the need for a separate mounting interface and reducing overall axial length while maintaining functionality.
2Device complexity
If only the spindle is supported by a bearing within the housing, then the structure is simple, but the runout accuracy of the drill chuck cannot be improved
Solution Approach 1:
The chuck body and spindle are merged into one integral structure, allowing the bearing to support both components simultaneously. This unified support structure reduces runout because the bearing supports the entire rotating assembly (spindle + chuck body) at a single location, eliminating cumulative runout from separate mounting interfaces.
3Ease of operation
If the drill chuck protrudes considerably forward of the bearing, then the chuck jaws can effectively grip bits, but the runout accuracy deteriorates
Solution Approach 1:
By integrating the chuck body with the spindle, the bearing supports the entire rotating assembly including the chuck portion. This unified support structure eliminates runout issues even when the chuck protrudes forward, as there is no separate mounting interface that could introduce misalignment or play.
4Ease of manufacture
If the spindle and chuck body are separate components, then manufacturing and assembly are simplified, but the overall length increases
Solution Approach 1:
The spindle and chuck body are formed as a single integrated component, eliminating the need for separate manufacturing and assembly operations. This integration reduces the overall axial length by removing the mounting interface and allowing the bearing to support the unified structure directly, while the manufacturing complexity is managed through precision casting or machining of the integrated form.
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 configuration reduces the overall length of the driver-drill in the axial direction, enhances runout accuracy, and makes the chuck more compact in the radial direction.
Implementation Method 1
The chuck body is supported by a bearing, which is disposed within a tube-shaped housing that houses a rearward portion of the chuck body
Data Source
AI summary
A driver-drill (1) includes a motor (16), a spindle (32), which is rotationally driven using rotational energy output by the motor (16), and a chuck (30), which rotates integrally with the spindle (32). The chuck (30) includes: a chuck body (31); a chuck sleeve (80), which is externally mounted on the chuck body (31); and two or more chuck jaws (67), which are provided in the chuck body (31) and which expand and contract relative to the rotational axis of the spindle (32) in response to manual rotation of the chuck sleeve (80). The spindle (32) may be integrally formed (in one piece) with the chuck body (31). In addition or in the alternative, the chuck body (31) may be rotatably supported by a bearing (42) disposed in a tube-shaped housing (6).