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Some key points about the Dana Spicer hydraulic torque converter.
Release date:
2021-12-24 12:02
Source:
Dana Spicer There is no rigid mechanical connection between the input and output shafts of a hydraulic torque converter; instead, power is transmitted via the working fluid, which helps eliminate shocks and vibrations, ensures smooth power delivery, and provides overload protection. As a result, during operation, the loader can start smoothly—much like an automatic‑transmission vehicle—without being affected by gear shifts. Moreover, even sudden increases in load have little impact on the engine, preventing stalling. These are all advantages of Dana‑Spicer hydraulic torque converters. However, there is one crucial point we have yet to address: the torque converter’s transmission efficiency. While efficiency reaches its peak when the clutch is fully engaged, the torque converter’s overall efficiency varies along a characteristic curve during operation.
Generally speaking, compared with the clutch in a manual transmission, an automatic transmission uses a hydraulic torque converter—often from Dana‑Spicer—to replace the traditional clutch. In other words, does the torque converter perform a function and role similar to that of a clutch? In fact, the torque converter is more stable and smarter than a clutch. However, unlike a clutch, it offers greater flexibility in power transmission: during startup, there is no rigid mechanical connection; instead, power is transmitted via fluid.
Dana Spicer As the interface between the engine and the transmission, the hydraulic torque converter—combined with several planetary gear sets—is a hallmark of automatic transmissions. During gear shifts, the torque converter operates in a flexible‑coupling mode; however, maintaining this flexible connection continuously results in very low transmission efficiency. To address this, an additional mechanism is required to switch from flexible to rigid coupling. The hydraulic torque converter incorporates a lock‑up clutch, which, once shifting is complete, transitions the converter from flexible to rigid coupling, thereby delivering an immediate and substantial boost in transmission efficiency. With advances in technology, the lock‑up clutch has evolved from a single‑plate design to a multi‑plate configuration. This improvement expands the clutch’s lock‑up range, prolongs the rigid‑coupling phase, and enhances the overall transmission efficiency.
Dana Spicer The hydraulic torque converter operates much like two fans facing each other: one fan is running, while the other, which is not operating, blows air. This analogy vividly illustrates the working relationship between the pump impeller and the turbine within a Dana‑Spicer torque converter. However, a detailed explanation of its operating principle is somewhat complex. After power is transmitted, it drives the pump impeller mounted on the torque converter housing; the impeller agitates the automatic transmission fluid inside, thereby rotating the turbine. The automatic transmission fluid circulates continuously within the housing. Due to the centrifugal force generated as the pump impeller spins, the ATF is flung outward, strikes the front‑mounted turbine, then flows axially back toward the pump impeller’s side. This endless circulation transfers power to the turbine, which is connected to the transmission.
Beijing Yihaowei Power Equipment Co., Ltd. specializes in Dana, Dana Spicer, Dana agency services, and Dana repair. Its product lineup includes Dana drive axles, Dana torque converters, Dana transmissions, Clark transmission‑driven axles, and Allison transmission spare parts, among others. Established in 2002, the company obtained authorization from Dana in 2004, becoming one of more than 60 service centers worldwide. Today, we operate one of China’s largest warehouses for powertrain components. Backed by a highly skilled professional team, we provide expert technical support and genuine, high‑quality product solutions to numerous equipment manufacturers, end users, and distributors both domestically and internationally.
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