Frictional Roller Reducer Pressure Control for Slip-Free Efficiency
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Solution Overview
Problem
Frictional roller reducers face inefficiencies and increased rolling resistance due to excessive surface pressure at traction portions, leading to decreased transmission efficiency and potential gross slipping, which is influenced by parameters like oil temperature and slip rate, necessitating a solution to maintain optimal torque transmission.
Innovation Solution
A frictional roller reducer with a pressing device and controller that adjusts surface pressure at traction portions using a pressing force adjusting motor, incorporating temperature and rotational speed sensors to set target pressure values, and optionally featuring a worm reducer with self-locking function and elastic planetary roller and annular roller element pressing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If loading cam type pressing devices are used to press the sun roller elements, then torque transmission is improved, but surface pressure at traction portions becomes excessive causing increased rolling resistance and decreased transmission efficiency
Solution Approach 1:
The pressing device uses a cam mechanism that dynamically adjusts the pressing force based on the operating conditions. The cam profile is designed to vary the pressing force during rotation, preventing excessive surface pressure while ensuring adequate torque transmission. This dynamic adjustment resolves the contradiction between maintaining power transmission and avoiding energy loss from excessive rolling resistance.
Solution Approach 2:
The invention changes the pressing force parameter by using a cam mechanism with a specific profile that modulates the force applied to the sun roller elements. By varying the pressing force according to the cam profile rather than applying constant force, the system optimizes the balance between torque transmission capability and rolling resistance, thereby improving transmission efficiency while maintaining adequate power transfer.
2Reliability
If high surface pressure is applied at traction portions, then gross slipping is prevented, but rolling resistance increases and transmission efficiency decreases
Solution Approach 1:
The cam-based pressing device provides dynamic control of surface pressure, adjusting it in real-time based on operational requirements. This prevents gross slipping by maintaining adequate pressure when needed while reducing pressure during normal operation to minimize rolling resistance, thus resolving the contradiction between reliability and energy efficiency.
Solution Approach 2:
The cam mechanism creates periodic variation in pressing force during each rotation cycle. This periodic action ensures that sufficient surface pressure is applied at critical moments to prevent gross slipping, while allowing pressure to be reduced during other phases of the cycle, thereby maintaining reliability without continuously incurring the energy penalty of high rolling resistance.
3Device complexity
If conventional pressing devices are used, then结构简单 (structure is simple), but surface pressure cannot be precisely adjusted leading to energy loss
Solution Approach 1:
The invention replaces conventional mechanical pressing devices with a cam-based mechanism that provides precise control over surface pressure. The cam profile geometry enables accurate adjustment of pressing force without requiring complex control systems, achieving a balance between structural simplicity and energy efficiency by using well-understood mechanical principles with optimized geometry.
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 solution allows for precise adjustment of surface pressure to prevent gross slipping and maintain high transmission efficiency, optimizing torque transmission while minimizing rolling resistance and energy loss.
Implementation Method 1
a frictional roller reducer that transmits torque from an input shaft to an output shaft... traction portions... surface pressure at the traction portions
Data Source
AI summary
The frictional roller reducer has an input shaft, an output shaft, a pair of annular roller elements, a plurality of planetary rollers, a carrier, a pressing device, and a controller. The pressing device rotationally drives a cam disk by a pressing force adjusting motor, which causes an annular roller element of the pair of annular roller elements to displace in the axial direction. The controller, by adjusting the rotational drive of the pressing force adjusting motor, adjusts the surface pressure at the traction portions between rolling surfaces of the planetary rollers and an inner-diameter side rolling contact surface of the input shaft and outer-diameter side rolling contact surfaces of the pair of annular roller elements to a target value.