A hydraulic impact motor

Details A hydraulic impact motor A hydraulic impact motor

E - Fixed Constructions

21

B

E21B 4/14 (2006.01)

Patent

CA 2178813

A hydraulic impact motor in the form of a water driven in-hole rock drilling machine has a valve spool (40) that has two equally big and opposite directed control surfaces (A1 and A2). The valve has also a third control surface (A3) which is smaller than the other two and which continuously under pressure. The third control surface (A3) acts in the same direction as the second control surface (A2). When the first control surface (A1) is under pressure but the second control surface (A2) is not, then the valve is moved in one direction, and when the first and second control surfaces (A1 and A2) is under equal pressure (full pressure or no pressure), then the valve is moved in the other direction by the third control surface (A3).

Moteur à percussion hydraulique, sous forme d'une foreuse fond de trou hydraulique, possédant une soupape cylindrique (40) pourvue de deux surfaces d'attaque (A1 et A2) de dimension égale et dirigées dans des sens opposés. La soupape possède également une troisième surface d'attaque (A3) plus petite que les deux autres et sous pression continue. La troisième surface d'attaque (A3) agit dans le même sens que la deuxième surface d'attaque (A2). Quand la première surface d'attaque (A1) est sous pression, mais non la deuxième surface d'attaque (A2), la soupape se déplace dans un sens et quand la première et la deuxième surfaces d'attaque (A1 et A2) se trouvent sous pression égale (pression totale ou absence de pression), la soupape se déplace dans l'autre sens sous l'effet de la troisième surface d'attaque (A3).

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