Transmission crank

Abstract

The invention discloses a transmission crank which comprises an upper casing and a lower casing, wherein an upper ear plate and a lower ear plate are arranged on the end faces of the two horizontal sides of the upper and lower casings respectively. The transmission crank is simple and reliable in structure; the upper and lower casings are connected through bolts, so that a machining process for forging is reduced; by positioning slots, stability in connection with a fixed rod is ensured; a support structure welded by a first vertical plate, a rib plate and second vertical plates is high in stability and material-saving, the mass of the transmission crank is reduced, and meanwhile, the strength of the crank and stability during connection with a connecting rod are also ensured; by the rib plate, radial internal stress on the lower casing is effectively dispersed, and the front ends of the upper and lower casings are prevented from being cracked; by design of extending plates and notches, fit between the upper and lower casings is ensured, and meanwhile, torque on the bolts during rotation is weakened; the machining process is simple, the transmission crank can be rapidly produced in batches, and the strong-strength crank connecting rod application requirement can be met.

Description

technical field

[0001] The invention relates to the technical field of transmission cranks, in particular to a transmission crank. Background technique

[0002] Pneumatic air valves (sometimes referred to as butterfly valves) in gas turbine engines typically include a coupling system, the actuator portion of which is cantilevered from the valve body to maintain a light weight and simple construction, and the coupling system is used to The translational axial movement of the piston is converted into the rotation of the disc to open or close the valve. The coupling system in a pneumatic air valve usually consists of two main parts: the crank and the connecting rod. The crank and connecting rod are pinned together with a tight fit metal pin. Taken together, the crank can resemble a tuning fork-like structure with a sleeve and two extension arms to connect above and below the connecting rod. To save weight, the crank is also made of carbon fiber, titanium alloy, or aluminum allo...

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