Torque Output Tool Nested Planetary Gearset
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Solution Overview
Problem
Traditional torque output tools with double-layer planetary gear trains face challenges in achieving a high gear ratio without compromising gear strength, and those with three-layer gear trains are bulky, making them unsuitable for portable applications.
Innovation Solution
A torque output tool design featuring a double-layer planetary gearset with a first and second planetary gearset, allowing switching between two gear ratios, and incorporating a torque adjustment mechanism to optimize rotational speed and torque output, while reducing the overall machine dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-layer planetary gear train is used to achieve a high gear ratio, then the deceleration capability is improved, but the device dimensions and weight increase
Solution Approach 1:
The patent employs a nested planetary gear structure where a first planetary gearset is positioned within a second planetary gearset. The first planet carrier is arranged inside the second planet carrier, creating a compact nested configuration. This nesting principle allows two stages of planetary reduction to be combined in a space-efficient manner, achieving high gear ratio (i≥10) without proportionally increasing device volume.
2Volume of moving object
If a double-layer planetary gear train is used to reduce device dimensions, then the portability is improved, but the gear strength decreases when achieving high gear ratio
Solution Approach 1:
The patent implements a selectable gear ratio mechanism that allows dynamic switching between different transmission states. A selector can engage different planet carriers (first or second planet carrier) to output torque, enabling the system to adapt between high-torque/low-speed mode and lower-torque/higher-speed mode. This dynamic configuration allows the compact double-layer structure to achieve high gear ratio when needed while maintaining gear strength through proper load distribution.
Solution Approach 2:
The patent combines multiple functional elements into an integrated double-layer planetary gearset. The first and second planetary gearsets share common components including the sun gear and ring gear, while their planet carriers are nested within each other. This merging of functions allows the compact structure to provide both high gear ratio capability and sufficient gear strength through the combined load-bearing capacity of the nested planetary stages.
3Volume of moving object
If a double-layer planetary gear train is used to reduce device dimensions, then the portability is improved, but the deceleration capability becomes insufficient for high gear ratio applications
Solution Approach 1:
The nested configuration of the first planetary gearset within the second planetary gearset enables two stages of reduction to be achieved in a compact volume. The first planet carrier and second planet carrier are arranged concentrically, with the first inside the second, creating a space-efficient nested structure that delivers high overall gear ratio (i≥10) without requiring a three-layer configuration.
Solution Approach 2:
The selectable output mechanism allows the system to dynamically configure its deceleration capability. By selecting different planet carriers as output elements, the system can optimize the effective gear ratio for different operational requirements, ensuring sufficient deceleration capability is achieved within the compact double-layer structure.
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
The design achieves a high gear ratio with ensured gear strength, reduces the tool's dimensions, and enhances portability, allowing for efficient torque and rotational speed adjustments to meet various operational requirements.
Implementation Method 1
The transmission assembly includes a first planetary gearset and a second planetary gearset. The first planetary gearset includes first planet gears and a first planet carrier. The first planet gears are driven by the motor, and the first planet carrier is used for mounting the first planet gears. The second planetary gearset includes second planet gears and a second planet carrier.
Data Source
AI summary
A torque output tool includes an output shaft, a motor, a transmission assembly, and a gearbox. The gearbox is used for accommodating the transmission assembly. The transmission assembly includes a first planetary gearset and a second planetary gearset. The transmission assembly is capable of being switched to a first state and a second state such that the transmission assembly outputs a first gear ratio or a second gear ratio separately, where the first gear ratio is greater than the second gear ratio. When the transmission assembly outputs the first gear ratio, a rotational speed of the output shaft is greater than or equal to 300 r/min and less than or equal to 800 r/min. A length of the gearbox in an axial direction is greater than or equal to 38 mm and less than or equal to 46 mm.