Patent ID: 6929098
Filing Date: 2005-08-16
Classification: B25D,F16N

Abstract:
1. An arrangement for lubricating the bearing surfaces between a tool of a hydraulic impact device and the impact device, the arrangement comprising: a supply pump and at least two separate channels for supplying lubricant between the bearing surfaces separately, at at least two points positioned at a distance from each other in the axial direction of the tool; separate dosing pumps for the lubricant in each of the two channels; the supply pump has a supply piston which is displaced toward a supply cylinder in the supply pump by the effect of the pressure of the hydraulic fluid in a hydraulic fluid channel in the impact device, and correspondingly, returns to the rest position when the pressure is reduced; the supply cylinder of the supply pump is connected to a lubricant tank via a check valve and correspondingly to the dosing pumps via a lubricant channel in such a way that when the supply piston of the supply pump is displaced toward the supply cylinder, it pushes pressurized lubricant to the dosing pumps, and when the supply piston of the supply pump returns to its rest position, lubricant flows from the lubricant tank to the supply-cylinder via the check-valve; and the dosing pumps operate at the pressure of pressurized lubricant supplied to them in such a way that when pressurized lubricant is supplied to a working cylinder of each of the dosing pumps, the dosing pumps supply lubricant doses of a predetermined amount along the two channels to the space between the bearing surfaces, and when the pressure of the lubricant is reduced in the working cylinders of the dosing pumps, a piston of each of the working cylinders returns to the rest position and loads at the same time a new dose of lubricant.