Cylinder body for plunger pump, plunger pump and engineering machinery

The utility model relates to a cylinder body for a plunger pump, the plunger pump and engineering machinery, belongs to the technical field of hydraulic pumps, and solves the problem that the existing plunger pump is crushed during working, a plunger hole is formed in the cylinder body for the plunger pump, and the plunger hole comprises a first hole part and a second hole part which are sequentially arranged in the direction from the liquid outlet end of the plunger hole to the extending end of a plunger, the first hole part is of a cylindrical structure, the second hole part is of a gradually-expanded hole structure, and the hole surface of the second hole part is an arc-shaped surface bent towards the center line direction of the plunger hole, so that the cylinder body is adopted, the crushing phenomenon is avoided, and the service life of the plunger pump is prolonged. 本实用新型涉及一种柱塞泵用缸体、柱塞泵及工程机械，属于液压泵技术领域，解决了现有柱塞泵工作时产生的压溃现象，柱塞泵用缸体内部具有柱塞孔，沿柱塞孔出液端至柱塞伸出端方向，柱塞孔包括依次设置的第一孔部和第二孔部，第一孔部为圆柱结构，第二孔部为渐扩孔结构，第二孔部的孔面为朝向柱塞孔