TENSIONING MODULE FOR AN ELECTROMECHANICAL WHEEL BRAKE AND ELECTROMECHANICAL BRAKE DEVICE
A tensioning module for an electromechanical wheel brake and to an electromechanical brake device comprises a stop bearing washer; an axial bearing; and a ball screw drive. The the ball screw drive comprises a spindle and a nut. The stop bearing washer is arranged at an axial end of a radial extension of the spindle, An anti-rotation safeguard arranged between the nut and a housing surrounding the tensioning module. The tensioning module is used to move a brake piston in the electromechanically operable wheel brake of a motor vehicle.
1 . A tensioning module for an electromechanical brake device for a motor vehicle comprising:
a stop bearing washer;
an axial bearing;
a ball screw drive, wherein the ball screw drive comprises a spindle and a nut, and wherein the stop bearing washer is arranged at an axial end of a radial extension of the spindle, and
an anti-rotation safeguard is arranged between the nut and a housing surrounding the tensioning module.
2 . The tensioning module as claimed in claim 1 , wherein the tensioning module comprises a piston which is axially displaceable by an axial movement of the nut, and wherein the stop bearing washer is arranged on a side of the spindle which lies opposite the piston.
3 . The tensioning module as claimed in claim 1 , wherein the spindle is supported by the axial bearing in the housing.
4 . The tensioning module as claimed in claim 1 , wherein the piston is connected by an elastic ring element to the housing, wherein the elastic ring element is elastically deformable such that a relative axial displacement of the housing and piston is possible.
5 . The tensioning module as claimed in claim 1 , wherein the spindle comprises a threaded portion and a drive portion, wherein the drive portion has a smaller cross-sectional area than the threaded portion.
6 . The tensioning module as claimed in claim 1 , wherein the spindle comprises a stop which runs around in an annular manner for the stop bearing washer.
7 . The tensioning module as claimed in claim 1 , wherein the stop bearing washer has at least one of an annular shape with a through hole, and a radially protruding shoulder.
8 . The tensioning module as claimed in claim 1 , wherein the stop bearing washer comprises a centering collar on the end face pointing toward the piston.
9 . The tensioning module as claimed in claim 1 , wherein the stop bearing washer comprises an internal spline system in the region of the through hole.
10 . The tensioning module as claimed in claim 9 , wherein the internal spline system has twelve teeth and wherein the corresponding drive portion of the spindle has a matching counterspline system for forming a positively locking connection therebetween.
11 . The tensioning module as claimed in claim 1 , wherein the stop bearing washer comprises a spline system on a piston-side end face, and wherein the spindle has flattened portions which are diametrically opposed with to the spline system for forming a positively locking connection therebetween.
12 . The tensioning module as claimed claim 1 , wherein the antirotation safeguard comprises a antirotation safeguard element which engages with the nut and the piston and provides an antirotation safeguard of the nut relative to the piston.
13 . The tensioning module as claimed in claim 12 , wherein the antirotation safeguard element further engages with the housing and provides an antirotation safeguard of the nut relative to the housing.
14 . The tensioning module as claimed in claim 12 , wherein the antirotation safeguard element has at least one of: a ring-shape, a radially protruding attachment, a pin which protrudes axially from an end face in the opposite direction to the piston, and is arranged on the attachment.
15 . The tensioning module as claimed in claim 1 , wherein the stop bearing washer provides at least one of a running surface for the axial bearing, and a tangential rotary stop between the spindle and the nut.
16 . The tensioning module as claimed in claim 1 , wherein the spindle, the stop bearing washer and the axial bearing are formed as separate components.
17 . An electromechanical brake device comprising:
an electromechanically operable disk brake, comprising
a tensioning module comprising:
a stop bearing washer;
an axial bearing;
a ball screw drive, wherein the ball screw drive comprises a spindle and a nut, and wherein the stop bearing washer is arranged at an axial end of a radial extension of the spindle, and
an anti-rotation safeguard arranged between the nut and a housing surrounding the tensioning module; and
an electric motor connected to the spindle for driving the spindle.
18 . A motor vehicle, comprising:
an electromechanically operable disk brake, comprising:
an electromechanically operable disk brake, comprising
a tensioning module comprising:
a stop bearing washer;
an axial bearing;
a ball screw drive, wherein the ball screw drive comprises a spindle and a nut, and wherein the stop bearing washer is arranged at an axial end of a radial extension of the spindle, and
an anti-rotation safeguard arranged between the nut and a housing surrounding the tensioning module; and
an electric motor connected to the spindle for driving the spindle.