Pressure regulating device for a percussive hydraulic apparatus

B - Operations – Transporting – 25 – D

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Details

B25D 9/26 (2006.01) B25D 9/14 (2006.01) B25D 9/20 (2006.01)

Patent

CA 2546267

A percussive apparatus comprises a body (2) inside of which a striking piston (4) is mounted in a cylinder bore (3). Two axially offset pieces (17, 18) are mounted inside the cylinder bore (3) of the body while being concentric to the piston, and a deformable washer (19) is placed between said pieces. One of the pieces (17) is stationary with regard to the other piece (18) that, however, is mounted in a manner that enables it to slide inside the cylinder bore and to be displaced in the direction of the stationary piece while being subjected to the action of the supply pressure of the hydraulic fluid that acts upon the surface of the moving piece (18) facing away from the side opposite the stationary piece (17). This displacement of the moving piece (18) causes the elastic washer (19) to deform in order to create a passage with a variable cross-section on the return circuit (15) of the hydraulic fluid to the reservoir or on a circuit that diverts, to the return circuit, a portion of the delivery flow of the apparatus whereby regulating the input pressure.

Appareil à percussion comportant un corps (2) dans lequel est monté dans un alésage (3) un piston de frappe (4). Dans l'alésage (3) du corps et concentriquement au piston sont montées deux pièces (17, 18) décalées axialement et entre lesquelles est disposée une rondelle déformable (19), l'une (17) des pièces étant immobile et l'autre pièce (18) étant montée coulissante dans l'alésage, et déplaçable en direction de la pièce immobile, sous l'action de la pression d'alimentation en fluide hydraulique, qui s'exerce sur la face de la pièce mobile (18) tournée du côté opposé à la pièce immobile (17), ce déplacement de la pièce mobile (18) provoquant une déformation de rondelle élastique (19) pour créer un passage de section variable sur le circuit (15) de retour du fluide hydraulique vers le réservoir, ou sur un circuit qui dérive vers le circuit de retour une partie du débit d'alimentation de l'appareil, de façon à réguler la pression d'entrée.

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