Planetary Gear Attachment Device for Rotary Hammer Tools
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Solution Overview
Problem
Existing attachment devices for hand-held power tools lack versatility and efficiency in converting the rotary drive's speed and torque into a percussive impulse, limiting their application range and compatibility with different tools.
Innovation Solution
The proposed attachment device incorporates a planetary gear mechanism that converts the speed and torque of the hand-held power tool's output shaft into a rotary percussion impulse, featuring a drive element integrated with the planet carrier, switchable gears, and a switching unit for controlling the impact, allowing for adaptable and powerful rotary percussion operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a planetary gear mechanism is used to convert speed and torque into rotary percussion impulse, then the efficiency and versatility of the attachment device is improved, but the device complexity increases
Solution Approach 1:
The planetary gear mechanism is divided into distinct functional components: sun gear, planet gears, planet carrier, and ring gear. Each component has a specific function in the speed and torque conversion process, allowing for optimized design and manufacturing of each segment while maintaining the overall efficiency of the percussion conversion mechanism.
2Volume of moving object
If the drive element is integrated with the planet carrier in one piece, then the device becomes more compact and robust, but the manufacturing complexity increases
Solution Approach 1:
The drive element and planet carrier are merged into a single integrated component. This integration eliminates the need for separate mounting operations, reduces the number of parts, and creates a more compact and robust attachment device. The integrated design allows the drive element to be directly formed as part of the planet carrier structure, optimizing space utilization and mechanical strength.
3Speed
If switchable gears with transmission ratio less than 1 are used, then the rotational speed is increased for rotary percussion operation, but the torque is reduced
Solution Approach 1:
The planetary gear mechanism provides dynamically adjustable transmission ratios through the switching unit. By changing the engagement configuration of the planet gears with the sun gear and ring gear, the system can optimize the balance between speed and torque based on the specific operational requirements of different attachment tools, enabling adaptive performance optimization.
4Adaptability or versatility
If a switching unit is added to control the impact, then the versatility and flexibility of operation is improved, but the device complexity increases
Solution Approach 1:
The switching unit is designed to be operated directly by the user through intuitive control elements on the attachment device itself. The switching mechanism automatically engages or disengages the planetary gear impact function based on user input, providing self-service operation without requiring external control systems or complex electronic components.
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 provides a compact, cost-effective, and robust attachment device that expands the usage range of hand-held power tools, enabling compatibility with various tools and applications, while allowing for flexible operation with or without impact, and simplifies the assembly process.
Implementation Method 1
the rotary percussion mechanism has at least one planetary gear 30a, which is provided for converting a speed and/or a torque of an output shaft 32a of the hand-held power tool 12a into a speed and/or a torque of the tool holder 18a
Implementation Method 2
The planetary gear 30a is designed in one stage, the planetary gear 30a has a transmission ratio of less than 1
Implementation Method 3
The rotary percussion mechanism can be designed in particular as a cam rotary impact mechanism or as a V-groove rotary impact mechanism
Implementation Method 4
The drive element 22a is intended to transmit a torque and/or a rotational movement from the output shaft 32a of the hand-held power tool 12a to the planetary gear 30a
Data Source
AI summary
The invention relates to an attachment device for arrangement on a handheld power tool (12a, 12b), having a tool receptacle (18a; 18b) for receiving a tool insert, and having at least one rotary hammer mechanism (20a; 20b) which, in at least one operating state, is provided for generating a rotary hammer impulse for hammer-action drive of the tool receptacle (18a; 18b). It is proposed that the rotary hammer mechanism (20a; 20b) has at least one planetary gear set (30a; 30b) which is provided for converting a rotational speed and/or a torque of an output shaft (32a; 32b) of the handheld power tool (12a; 12b) into a rotational speed and/or a torque of the tool receptacle (18a; 18b).