2results about How to "High shear stability" patented technology

The present application relates to the technical field of hydraulic transmission oil, and particularly relates to a hydraulic transmission oil composition with high shear stability and a preparation method thereof. The hydraulic transmission oil composition comprises the following components in parts by weight: base oil 85-99 parts, composite additive 0.1-5 parts, viscosity index improver 1-10 parts, pour point depressant 0.1-2 parts, and anti-foaming agent 0.001-0.1 part. The base oil is at least one of type I, type II and type III base oil. The viscosity grade of the base oil is No. 4, No. 6 or No. 8. The hydraulic transmission oil composition has high shear stability, good low-temperature performance, good copper strip corrosion resistance and good rust prevention, and can be used in vehicle hydraulic couplings and hydraulic torque converters, and can also be used in the hydraulic transmission system of engineering machinery.

The application discloses a split type shearing ram for blowout preventer, which comprises an upper shearing ram assembly and a lower shearing ram assembly. The upper shearing ram assembly comprises an upper shearing ram body, an upper shearing cutter body and a first clamping plate. The upper shearing cutter body is in concave-convex cooperation with the upper shearing ram body and is connected through a fastening screw. The upper shearing ram body is connected with a first ram shaft through the first clamping plate. The lower shearing ram assembly comprises a lower shearing ram body, a lower shearing cutter body and a second clamping plate. The lower shearing ram body is in concave-convex cooperation and sliding connection with the upper shearing cutter body. The lower shearing cutter body is in concave-convex cooperation with the lower shearing ram body and is connected through a fastening screw. Meanwhile, the cutting edge of the lower shearing cutter body corresponds to the cutting edge of the upper shearing cutter body. The lower shearing ram body is connected with a second ram shaft through the second clamping plate. The first ram shaft and the second ram shaft are located on the same horizontal line. The application has low maintenance cost, good shearing stability, reliable connection, convenient disassembly and assembly and strong shearing capacity.