Microelectromechanical Viscosity Measurement Devices and Methods Thereof

Synopsis

Patent US 8,747,268 B2 describes gear-based continuously variable transmission (CVT) systems and methods thereof. This invention offers a novel approach to power transmission, providing an efficient and adaptable alternative to traditional fixed-gear transmissions and conventional CVTs, particularly for applications requiring a wide range of speed ratios and high torque capacity. The core innovation lies in a unique planetary gear set configuration that enables continuous variability in output speed relative to input speed, while maintaining high mechanical efficiency.

A key novel aspect of this invention is the use of a planetary gear set integrated with a rotary coupling unit, such as a torque converter or fluid coupling unit. This integration allows for an expanded range of continuously variable ratios. Unlike typical CVTs that rely on belts between adjustable sheaves, this design primarily utilizes gears, which generally offer higher torque capacity, durability, and efficiency. Specifically, the patent details a system where a rotary coupling unit is strategically placed within a planetary gear train. This configuration enables:

• Expanded Ratio Range: The combination of the planetary gear set and the rotary coupling unit allows the system to achieve a very wide range of gear ratios, including infinite ratios and overdrive ratios. For example, one embodiment can smoothly change gear ratios from 100:1 to an overdrive ratio of 0.5:1. This is highly beneficial for optimizing engine operation across diverse load conditions.

• High Efficiency: By leveraging the inherent efficiency of geared systems, the power flow can be split, with a portion of the output rotational energy fed back as a second input to the gear set. This feedback mechanism results in improved speed matching between input and output speeds, leading to higher overall transmission efficiency.

• Scalability and Robustness: The gear-based nature of the system makes it inherently more robust and scalable for applications involving higher power and torque, addressing a limitation of many existing CVT technologies. Embodiments are described for both light duty (e.g., cars) and heavy duty (e.g., trucks, construction equipment) applications.

• Smooth and Seamless Operation: The continuous variability eliminates distinct gear shifts, providing smoother power delivery and potentially improving fuel economy by allowing the power source to operate at its most efficient RPM.

• Compact Design and Reduced Parts Count: Various embodiments demonstrate substantial improvements in packaging and lowering parts count, leading to a highly compact CVT system design. This is achieved by directly coupling components and eliminating intermediate gears.

The commercial potential for this gear-based CVT technology is substantial across various sectors requiring efficient and flexible power transmission:

• Automotive Industry: For passenger vehicles, this technology offers improved fuel efficiency by keeping the engine in its optimal operating range, enhanced acceleration, and a smoother driving experience. Applications include go-carts and other vehicles.

• Heavy-Duty Vehicles and Equipment: The robustness and high torque capacity make this CVT suitable for trucks, buses, construction equipment, and agricultural machinery. These applications demand reliable and efficient power delivery under heavy loads and varying speeds, where this invention could significantly improve productivity and fuel economy.

• Industrial Machinery: Various industrial machines, such as pumps, compressors, and manufacturing equipment, could benefit from the precise speed control and efficiency gains offered by this gear-based CVT, leading to reduced energy consumption and improved process control.

• Sub-modules or Standalone Systems: Embodiments of the present invention can be utilized as sub-modules in conjunction with and/or parallel to other types of transmission systems, or can be used as a standalone independent continuously variable transmission system to drive one or more loads.

This invention provides a durable, efficient, and highly versatile continuously variable transmission solution, capable of meeting the rigorous demands of diverse applications where performance and energy efficiency are paramount. Its unique gear-based architecture positions it as a compelling alternative to current transmission technologies.