Generally speaking, overdrive is the highest gear in the transmission. Overdrive allows the engine to operate at a lower RPM for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway.

2023年2月12日 · Overdrive is a driving technology that allows the driver to maintain higher speeds without excessive engine wear or fuel consumption. Overdrive works by changing the transmission ratios on the last gear so that it acts like an extra gear. Overdrive can be referred to as several different features.

Calculator to make the right dimensions for a gear or gear blank: calculate gear pitch, outer diameter (OD), root diameter, and clearance.

2012年10月22日 · 超速传动（超比）档开关（O/D）：自动变速器的最高档通常是超比档，该档位齿轮比（减速比）低于一，也就是该档位将引擎扭力放大倍数变成低于一倍，有助于省油，但不利于加速。 超比开关关闭后，D档行驶时，自动变速器将无法换入超比档。 通常在上坡及路面状况不良时应考虑将此开关关闭。 尽量以简单的语言回答，不知道说的对不对，请包涵。 上述现象是由控制器（TCU）里面的换挡策略导致的。 以一个最高档位4档的自动变速器为例： 上图是简单 …

In this section we introduce the basic parts of Spur Gears (Cylindrical gears) and dimensional calculations. The size of gears is determined in accordance with the reference diameter (d) and determined by these other factors; the base circle, Pitch, Tooth Thickness, Tooth Depth, Addendum and Dedendum.

2022年4月24日 · In the automotive world, O/D stands for overdrive, which signifies the top gear or gears in a car’s transmission. The O/D off button allows you to prevent an automatic …

2020年7月8日 · Overdrive’s functionality is to serve as a high gear mode for a vehicle and can be looked at as an added gear that widens the transmission’s shifting range at its top end. By shifting higher, the powertrain reaches lower gear ratios (the higher the gear, the lower the ratio) and allows the engine to perform at lower RPMs during highway ...

2024年1月16日 · Overdrive is an extra higher gear in your transmission designed to increase fuel economy and drivability in freeway or long steady drive conditions. What does the overdrive button do in a car? Instead, the overdrive feature found in most cars acts as an inhibitor against your car’s fuel needs.

Outside Diameter (OD) inspection machines from United Tool Supply offer a highly accurate way to measure the external dimensions of gears (Spur, Helical) and splines. Our OD gauges use precision cushioned actuation to determine variances in part diameters quickly and with repeatability of 0.00005 inches (0.001mm).