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Internal Combustion Engines
Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017
Don M. Pirro, Martin Webster, Ekkehard Daschner
In a crosshead type of engine (illustrated in Figure 10.3), the piston is connected rigidly to a piston rod, which is connected to the crosshead containing the wrist pin. The crosshead also has a sliding guide bearing to absorb the side thrust from the crankshaft and connecting rod. This bearing is usually generously proportioned so that these thrust loads are readily carried by the lubricating oil films. No side thrust is carried by the piston. The cylinder assembly is usually completely separated from the crankcase, whether by means of a diaphragm containing a packing gland, commonly called a “stuffing box,” or by having the lower end of the cylinder closed so that it can be used for pulse charging.
Compressor Types
Published in Tony Giampaolo, Compressor Handbook, 2020
The crosshead (Figure 3-18) rides in the crosshead guide moving linearly in alternate directions with each rotation of the crankshaft. The piston rod connects the crosshead to the piston. Therefore, with each rotation of the crankshaft the piston moves linearly in alternating directions.
Simulation Analysis and Experimental Verification of Tribodynamics of Reciprocating Friction Pairs in Low-Speed Marine Engines
Published in Tribology Transactions, 2023
Xianghui Meng, Rui Li, Youbai Xie, Chuanjuan Wang
As shown in Fig. 2, the conjoined coordinate (i = 1–4) is established on each component, and the coordinate origin is established at the center of mass of the component. The global coordinate is and the coordinate origin is at the crankshaft rotation center. The piston assembly, the piston rod, and the crosshead pin are fixedly connected with each other by bolts, so they can be regarded as one component. In order to describe the motion states of the four components (crankshaft, connecting rod, crosshead slipper, piston assembly–piston rod–crosshead pin), 12 Cartesian coordinates need to be introduced. They are the coordinates of the ith component’s centroid and the rotation angles of the ith component
Research on torsional vibration characteristics of reciprocating compressor shafting and dynamics modification
Published in Mechanics of Advanced Materials and Structures, 2020
Jian Liu, Xiaodong Sun, Xiao Zhang, Xiaobing Hou
In the operating process, both sides of the piston bear inlet and exhaust pressures. The piston, crosshead and the small end of the connecting rod exert inertia force due to reciprocating motion, and the resultant force is transmitted to the crankshaft by a connecting rod. Meanwhile, the force of the connecting rod is decomposed into the tangential force Ft and the radial force Fr. Assuming the crank angle is α and the swing angle of the connecting rod is β, then, the geometrical relations of each part are described in detail as: