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PumpsIndustrial Products

Swash Plate Group Technical Description (continued)The Rotating Group The Rotating Group comprises: (a) Valve plate 313(b) Cylinder block, 141 (c) Pistons, 9 x 151 + Shoes, 9 x 152 (d) Setting plate, 153 (e) Spherical bush, 156 (f) Cylinder springs, 9 x 157The drive shaft is coupled to the cylinder block through a splined section and supported at both of its ends by bearings. The shoe is swaged over the spherical end of the piston forming a spherical ball joint. Additionally the shoe has a hydrostatic pocket to balance the hydraulic thrust developed by the piston pressure allowing the shoe to lightly slide against the shoe plate.The subgroup consisting of the pistons and shoes are pressed against the shoe plate by the cylindersprings acting through the setting plate and the spherical bush. The force developed by these cylinder springs also press the cylinder block against the valve plate. Only the K3VL45-60 units use a single centralised spring with individual push pins provide the shoe and cylinder block hold down force. The Swash Plate Group comprises:(a) Swash plate, 212(b) Shoe plate, 211 (c) Swash plate support, 251 (d) Tilting bush, 214 (e) Tilting pin, 531 (f) Servo piston, 532The swash plate on the reverse side to the shoe location is a cylindrical form which is a “pillow” supported by the hydrostatic bearing provided by the swash plate support. The tilting bush is inserted into the swash plate and into this is installed the spherical portion of the tilting pin which is coupled to the servo piston.Any linear movement of the servo piston produced by the regulator pressure applied to either end istranslated through the tilting pin into an angular movement of the swash plate which varies the tilting or swash angle of the pump. A screw adjuster and lock nut is available to adjust the maximum tilting angle condition. The servo assist springs are provided to ensure good on stroking response particularly at low operating pressures. Model K3VLPage 3.Data SheetP-1002/02.09