Internal check valve

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 15/20 (2006.01) F15B 15/14 (2006.01)

Patent

CA 2118971

An internal check valve for use in a linear hydraulic motor in the form of a piston-cylinder unit including a cylinder body (38) reciprocally slidable on a piston component (40). The piston component (40) includes a tubular piston rod (52) and a piston head (60) defining first and second working chambers (136, 140) within the cylinder body (38). The tubular piston rod (52) includes a center tube (102) located within the piston rod (52). The center tube (102) provides a fluid passageway (134) through its center which communicates with a first working chamber (136). An annular second passageway (142) is formed by and radially between the piston rod (52) and the center tube (102). A spring biased check valve (116) is positioned within the piston rod (52, 54) and is operatively connected with one of the passageways (134, 126, 130). The check valve (116) has a valve member displaceable from a valve seat (120) by hydraulic pressure to overcome the spring bias (122, 124) and allow flow in one direction. The center tube (102) is axially displaceable relative to the piston rod (52). Displacement is effected by end of stroke movement of the cylinder body (38) and displacement of the center tube (102) causes displacement of the valve member (116) to mechanically open the check valve.

Cette invention concerne un clapet de retenue pour moteur hydraulique linéaire prenant la forme d'un ensemble piston-cylindre composé d'un corps de cylindre (38) animé d'un mouvement alternatif coulissant sur un piston (40). Le piston (40) comprend une tige tubulaire (52) et une tête de piston (60) définissant une premier et une seconde chambres de travail (136, 140) à l'intérieur du corps de cylindre (38). La tige de piston tubulaire (52) comporte à l'intérieur un tube central (102) qui définit un passage intérieur (134) communiquant avec la première chambre de travail (136). Un second passage annulaire (142) se trouve entre la tige de piston tubulaire (52) et le tube central (102) de celui-ci. Un clapet de retenue à ressort (116) placé à l'intérieur de la tige de piston (52, 54) est raccordé à l'un des passages (134, 126, 130). Il comporte un obturateur que la pression hydraulique soulève d'un siège de clapet (120) contre la force élastique d'un ressort (122, 124) pour forcer l'écoulement dans un sens. Le tube central (102) se déplace axialement par rapport à la tige de piston (52) sous l'impulsion du corps de cylindre (38) en fin de course et ce déplacement entraîne celui de l'obturateur (116) pour forcer l'ouverture mécanique du clapet de retenue.

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