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US 2006/0213690 A1Published application
Rock drilling machine and axial bearing
AssigneeSandvik Tamrock Oy
InventorsTimo Muuttonen, Esa Rantala
Life of this patent
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Abstract
The invention relates to an axial bearing and to a rock drilling machine pro-vided with an axial bearing. The axial bearing (100) comprises a first piston (20) and a second piston (21). Axial contact surfaces (60, 43a) between the pistons (20, 21) are arranged in the same pressure space (28). The same pressure fluid fed to the axial bearing acts on the contact surfaces and on working pressure surfaces of the pistons.
Claims12
A rock drilling machine comprising at least:
- a frame;
- a percussion element for generating stress pulses;
- a shank arranged at the front of the percussion element in the percussion direction, the shank comprising a percussion surface for receiving said stress pulses;
- and
- an axial bearing comprising at least:
- a first piston and a second piston;
- between the pistons, an axial first contact surface and an axial second contact surface, the contact surfaces being located in the same pressure space;
- at least one pressure duct for leading pressure fluid from a pressure source to the axial bearing;
- pressure surfaces in the pistons, on which surfaces the pres-sure fluid is arranged to act for axial movement of the pistons;
- and in which axial bearing the pistons are arranged to push the shank along a different travel length towards the percussion direction;
- the force of said pistons, by the action of the pressure fluid towards the percussion direction, being dimensioned such that the percussion surface is adjustable during drilling at the desired axial point for receiving the stress pulses,
- wherein the same pressure fluid fed to the axial bearing is arranged to act on said piston contact surfaces and pressure surfaces.
9 more elements
An axial bearing for a percussion rock drilling machine, the axial bearing comprising at least:
- a frame;
- at least a first piston and a second piston arranged in a space formed in the frame, both comprising at least one pressure surface;
- at least one pressure duct for leading pressure fluid to said pressure surfaces for axial movement of the pistons;
- and,
- between the pistons, axial contact surfaces located in the same pressure space, wherein
- the same pressure fluid fed to the axial bearing is arranged to act on said piston contact surfaces and pressure surfaces.
3 more elements
Dependencies are inferred from the claim text.