Impact Driving Tool Intermediate Member Mass Distribution
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Solution Overview
Problem
Conventional hammer drills face challenges in miniaturization and operation efficiency due to the need for increased mass in the striking mechanism to enhance impact force, which often results in tool enlargement and reduced maneuverability.
Innovation Solution
The design incorporates a larger diameter intermediate member with a reduced thickness ball bearing and a washer to absorb impact, allowing for increased mass without enlarging the tool, and a reciprocating mechanism that converts rotational movement into forward and backward motion to enhance drilling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the mass of the intermediate member is increased to improve impact force, then the impact force applied to the bit is improved, but the tool is enlarged and serviceability is deteriorated
Solution Approach 1:
The invention changes the dimensional parameters of the intermediate member by enlarging its diameter while correspondingly reducing the thickness of the ball bearing. This parameter substitution allows the intermediate member to have increased mass for higher impact force while the reduced bearing thickness compensates for the space occupied, preventing overall tool enlargement.
Solution Approach 2:
The invention transitions the problem from a one-dimensional solution (increasing length or overall size) to a multi-dimensional solution by adjusting both the diameter (cross-sectional dimension) of the intermediate member and the thickness (axial dimension) of the ball bearing. This dimensional redistribution allows mass increase without proportional increase in overall tool volume.
2Force
If the outside diameter of the cylinder is enlarged to accommodate the enlarged intermediate member, then the mass of the intermediate member is increased, but the thickness of the ball bearing must be reduced and additional washers are required
Solution Approach 1:
The invention introduces washers as intermediary elements between the ball bearing and the cylinder. These washers distribute the load and allow the ball bearing to be thinner while still providing adequate support. The washers act as mediators that enable the decomposition of the bearing structure into thinner, more space-efficient components.
3Volume of moving object
If the thickness of the ball bearing is reduced to accommodate the enlarged cylinder, then the tool size is maintained, but the load-bearing capacity of the bearing may be compromised
Solution Approach 1:
The invention compensates for the reduced thickness of the ball bearing by changing other parameters of the bearing system, specifically by introducing washers with adequate thickness and load-bearing capacity. The combined system of thin bearing plus washer maintains or exceeds the original load-bearing capacity while allowing the overall package size to remain compact.
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 improves drilling performance by increasing the impact force applied to the bit while maintaining the tool's compact size, ensuring efficient operation and maneuverability.
Implementation Method 1
a ball bearing that supports an output shaft of a motor so as to freely rotate
Implementation Method 2
a cylinder provided so as to freely rotate relative to the main body housing by a ball bearing and freely move forward and backward through a slide bearing
Implementation Method 3
a washer is provided at a part where the ball bearing abuts on the cylinder in the forward and backward moving direction of the cylinder
Implementation Method 4
a forward and backward driving converting unit that converts the rotating movement of the motor into a forward and backward movement in the extending direction of the cylinder by using a reciprocating mechanism
Implementation Method 5
an intermediate member that transmits an impact force by the striking member to a bit provided at the end of the cylinder from an inner part of the cylinder
Data Source
AI summary
In a driving tool, a diameter of an intermediate member is enlarged to increase a mass of the intermediate member and an outside diameter of a cylinder at a position where the intermediate member is internally provided is enlarged in accordance with the enlarged diameter of the intermediate member. Further, in the driving tool, a bearing thickness of a ball bearing is reduced correspondingly to a dimension of the enlarged outside diameter of the cylinder and a washer is provided at a part where the ball bearing abuts on the cylinder in the forward and backward moving direction thereof.