Patent ID: 8931358
Filing Date: 2015-01-13
Classification: F16H,Y10T

Abstract:
1. A ball screw with a dust-proof and lubricating device comprising: a screw formed on an outer surface thereof with an outer helical groove; a first nut mounted on the screw, and formed with a first axial hole with a first axis, a first inner helical groove which is formed in an inner surface of the first axial hole and cooperates with the outer helical groove of the screw to define a first load path, a first oil-guiding hole parallel to the first axis, a first radial oil hole in communication with the first oil-guiding hole and the first inner helical groove, and an oil-feeding hole in communication with the first radial oil hole; a prestressed unit sleeved on the screw and located at an end surface of the first nut; a second nut mounted on the screw to press against the prestressed unit and including a second axial hole for insertion of the screw, and the second axial hole including a second axis which is coaxial to the first axis, the second nut being further formed with a second inner helical groove which is formed on an inner surface of the second axial hole to cooperate with the outer helical grooves of the screw to define a second load path connected to the first load path, a second oil-guiding hole parallel to the second axis, and a second radial oil hole in communication with the second oil-guiding hole and the second inner helical groove; a plurality of balls rolling endlessly in the first and second load paths; an oil-absorbing member disposed in the first and second nuts and including a body disposed in the first and second oil-guiding holes, a first end disposed in the first radial oil hole, and a second end disposed in the second radial oil hole; at least one first return unit disposed in the first nut to enable turning and circulation of the balls; at least one second return unit disposed in the second nut to enable turning and circulation of the balls; a first dust-proof member sleeved on the screw and located at one end of the first axial hole of the first nut; and a second dust-proof member sleeved on the screw and located at one end of the second axial hole of the second nut.