| 摘要 |
A pneumatic motor assembly for a lubricant pump comprises a body which forms a cavity supplied with compressed air, a first hole and a second hole which are formed axially on the side wall of the cavity, a stem, which is slidingly accommodated in the first and second holes and supports, at one end, a piston which moves in a cylinder associated with the body and, at the other end, cooperates with the riser of the pump. An exchanger means is accommodated in the cavity and is provided with an axial through hole which slidingly accommodates a narrow intermediate portion of the stem; a means for diverting the air is associated with a front opening of the cavity and interacts with the exchanger means; and an elastic means cooperates laterally with the exchanger means; the axial through hole includes a wider end portion, which is directed toward the end of the stem that is provided with the piston and accommodates a non-narrow part of the stem during the return stroke of the piston; the elastic means is arranged between the exchanger means and the side wall.
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