Hammer Drill Interchangeable Gears and Restoration Springs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hammer drills have durability issues due to friction and separate manufacturing of different components, leading to increased component usage and reduced productivity.
Innovation Solution
A hammer drill design with a conversion lever and interchangeable gears, where the drill and hammer moving gears are formed in the same shape, minimizing component usage and reducing friction through restoration springs, allowing for mode conversion using a single member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drill driving unit and hammer driving unit are configured differently, then each unit can perform its specific function, but the number of components increases and productivity decreases
Solution Approach 1:
The patent applies universality by making the drill driving unit and hammer driving unit share the same basic configuration and components. The moving gear is designed with universal engagement capabilities - it can engage with either the drill clutch gear or hammer clutch gear depending on the selected mode. This allows a single moving gear component to perform multiple functions, reducing the total number of parts needed while maintaining both drilling and hammering capabilities.
Solution Approach 2:
The patent employs dynamics through the mode conversion mechanism that allows the system to switch between different operational states. The moving gear dynamically changes its engagement state - it can be engaged with the drill clutch gear for drilling mode, engaged with the hammer clutch gear for hammer mode, or disengaged from both for idle state. This dynamic reconfiguration enables one component to serve multiple purposes without requiring separate dedicated components for each function.
2Ease of operation
If the restoration spring is installed on the shaft, then the drill moving gear can be restored to engaged position, but friction occurs during hammer mode rotation reducing durability
Solution Approach 1:
The patent applies the extraction principle by removing the restoration spring from the shaft and relocating it to the moving gear itself. The restoration spring is now integrated with the moving gear assembly rather than being a separate component on the shaft. This extraction eliminates the friction problem because the spring no longer rotates with the shaft during hammer mode - it remains stationary relative to the housing while only exerting force on the moving gear to restore it to the engaged position.
Solution Approach 2:
The patent uses an intermediary approach by introducing a restoration spring that acts as a mediator between the moving gear and the housing. The spring is positioned to exert restoring force on the moving gear without being directly connected to the rotating shaft. This intermediary spring transmission mechanism allows the moving gear to be restored to its engaged position without the spring itself undergoing rotation, thereby eliminating friction and wear.
3Adaptability or versatility
If the drill gear performs sliding motion in engaged state, then the drill mode can be activated, but the load from output unit reduces the durability of drill gear
Solution Approach 1:
The patent applies dynamics by making the engagement state of the drill gear conditional rather than fixed. The moving gear can dynamically transition between engaged and disengaged states based on the selected mode. When drilling mode is selected, the moving gear engages with the drill clutch gear and performs the necessary sliding motion for operation. When hammer mode is selected, the moving gear disengages from the drill clutch gear, eliminating the sliding motion and associated wear. This dynamic state change allows the system to optimize durability by avoiding unnecessary wear during modes where it is not required.
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
Enhances durability by preventing sliding motion of the drill driving unit and reducing friction, while minimizing component count and manufacturing time, thus improving efficiency and productivity.
Implementation Method 1
a drill side restoration spring installed between the drill driving unit and the drill moving gear, and configured to restore the drill moving gear to the first position
Implementation Method 2
a hammer side restoration spring installed between the hammer driving unit and the hammer moving gear, and configured to restore the hammer moving gear to the third position
Implementation Method 3
a hammer driving unit rotatably installed at the shaft which is at one side of the main clutch gear, coupled to an output end, and having a drill clutch gear on an outer circumferential surface thereof; a hammer clutch gear rotatably installed at the shaft which is at another side of the main clutch gear, and fixed to a hammer driving unit for converting a rotary motion of the shaft into a reciprocation of a hammer
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A hammer drill (1) includes a shaft (110) with a main clutch gear (120), the shaft (110) being rotatable by a driving force of a driving motor, and having a mode conversion among a hammer mode for hitting a bit (60) as a rotary motion of the shaft (110) is converted into a linear reciprocation, a drill mode for rotating the bit by rotation of the shaft (110), and a hammer drill mode for rotating and hitting the bit (60). A hammer moving gear (160) and a drill moving gear (130) are formed in the same shape. A drill side restoration spring (140) is installed between a drill driving unit (150) engaged with the drill moving gear (130), and the drill moving gear (130). And a hammer side restoration spring (170) is installed between a hammer driving unit (180) engaged with the hammer moving gear (160), and the hammer moving gear (160). With such a configuration, the gears (120, 130, 160) can be easily engaged with each other by restoration forces of the springs (140, 170).