Abstract:
The invention relates to a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body (6) fitted with at least two peripheral webs (10) on its peripheral surface, said webs limiting a groove (11) and also including a collar-shaped sealing element (9) made of thermoformable plastic material that overlaps the webs (10). Said piston also comprises axial passage channels (7, 8) in the piston body that are closed by throttle valves (7.1, 8.1) opening on one side and at least one radial hole (12) connecting at least one passage channel (7, 8) to the groove (11) formed between two webs (10).
Abstract:
A free piston device which is particularly applicable for use with a linear motor for providing acoustic energy to a cryocooler for generating refrigeration at cryogenic temperatures which comprises a time varying clearance seal to counteract piston drift by reducing or eliminating the time averaged flow of working fluid which would otherwise occur.
Abstract:
A piston (1) for a two-stroke crosshead engine has a number of ring grooves (2-4) for piston rings. At at least some of the rings the piston has pressure relief passages the axes of which avoid hitting the piston ring (14) at extension through the outlet openings (20). The total cross-sectional area expressed in mm of the pressure relief passages associated with the individual piston ring is in the interval from D /68000 to D /10000, D being the cylinder diameter expressed in mm.
Abstract:
A piston (11) incorporates spring means acting, in use, between the piston and an associated connecting rod so as to bias the connecting rod away from the crown (112) of the piston. The spring means (117) is integrally formed with the piston (111) and is configured as a bellows spring.
Abstract:
The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body (6) that is fitted with at least one peripheral web (10) on its peripheral surface, wherein a collar-shaped sealing element (9) made of thermoformable plastic material is also formed on the peripheral surface of the piston body (6) in such a way that the web (10) is only formed in part of the height of the material of the collar-shaped sealing element (9).
Abstract:
An improved seal and stabilizing system for a piston head in a tank cylinder provides a better mechanism for discharging and wiping a cylinder when heavy liquids such as chocolate or peanut butter or being dispensed. The seal system now includes a free-floating block inside the seal and grooves in the inner lower part of the hollow seal. The block and grooves keep the upper, outer part of the seal from deforming away from the inner surface of the cylinder that facilitates complete discharging and wiping of the material from the cylinder tank. The tensioning mechanism of the seal is made from a unitary and annular ring T-ring that easily slides on the rear surface of the piston head. In order to stabilize the movement of the piston head down the cylinder, clockwise and counterclockwise springs are provided for the stabilizing shoes. The dual spring arrangement prevents coil binding of the springs. The springs and stabilizing shoes maintain the piston head cross-section parallel to the cross section of the cylinder.
Abstract:
A free piston device which is particularly applicable for use with a linear motor for providing acoustic energy to a cryocooler for generating refrigeration at cryogenic temperatures which comprises a time varying clearance seal to counteract piston drift by reducing or eliminating the time averaged flow of working fluid which would otherwise occur.
Abstract:
The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body (6) fitted with a peripheral web (12) protruding from the peripheral surface in a section adjacent to the end of the piston (4.1) to which support webs (10) are attached, said webs extending parallel and spaced in relation to each other in longitudinal direction towards the other end of the piston (5.1). Two adjacent support webs (10) limit a groove-shaped recess (11), said webs being open on the ends opposite the peripheral web (12) in longitudinal direction. The piston also comprises a collar-shaped sealing element (9) made of thermoformable plastic material that is formed on the piston body (6) in such a way that only part of the height of both the peripheral web (12) and the support webs (10) is formed in the material of the collar-shaped sealing element (9).
Abstract:
A sanitary piston head with a body, said piston head having a fluid-contact end and a drive end and comprising a resilient sealing skirt arranged to provide sealing abutment against the inner wall of a cylinder when said piston head is inserted in said cylinder, wherein the resilient sealing skirt is biased in the sealing direction by a radially biasing element.
Abstract:
A piston chamber combination comprising a container type piston, communicating with an enclosed space, said enclosed space having an at least substantially constant volume.