ELECTROMECHANICAL BRAKE DEVICE
An electromechanical brake device for a motor vehicle; having an electric motor drive for the provision of a torque is provided. A transmission assembly for converting the torque into an application force acting along the application direction of the brake device is provided. A support device for supporting the transmission assembly counter to the application direction, and a clamping device for converting the force acting along the application direction into a clamping force acting on an element to be decelerated is provided. The support device may have a force-measuring device for measuring a force acting on the support device along the application direction, wherein the support device has a preloading device, wherein, A preloading device of the support device together with the transmission assembly subjects the force-measuring device to a force acting along the application direction—even in the absence of a force generated by the electric motor.
1 . A support device for supporting a transmission assembly of an electromechanical brake device for a motor vehicle comprising:
a clamping device for converting the force acting along an application direction into a clamping force acting on an element to be decelerated,
a force-measuring device for measuring a force acting on the support device along the application direction, and
a preloading device, wherein the preloading device together with the transmission assembly subjects the force-measuring device to a force acting along the application direction even in the absence of a force generated by the electric motor drive.
2 . The support device as claimed in claim 1 , wherein the preloading device comprises at least one spring element, which is designed to apply a preloading force in the axial direction.
3 . The support device as claimed in claim 1 , wherein the spring element comprises at least one compression spring.
4 . The support device as claimed claim 1 , wherein the support device has a ring-shaped body and an axial bearing ring, wherein the ring-shaped body is supported counter to the application direction on a housing of the brake device, and wherein the axial bearing ring is supported counter to the application direction on the ring-shaped body via the force-measuring device.
5 . The support device as claimed in claim 1 , wherein a clamping ring is arranged between the ring-shaped body and the axial bearing ring, wherein the clamping ring subjects the axial bearing ring to a force in the direction of the force-measuring device.
6 . The support device as claimed in claim 5 , wherein the clamping ring is secured along the application direction by a retaining ring, wherein the retaining ring is arranged at least partially in an encircling groove in an inner wall of the ring-shaped body.
7 . The support device as claimed in claim 1 , wherein an encircling ring-shaped collar is formed on the axial bearing ring, wherein the ring-shaped collar extends in the application direction and delimits the radial extent of the clamping ring.
8 . The support device as claimed in claim 1 , wherein the transmission assembly has a spindle drive with a threaded spindle and a spindle nut secured against rotation about the threaded spindle wherein the spindle nut is supported counter to the application direction on the support device.
9 . The support device as claimed in claim 8 , wherein a roller bearing is arranged between the axial bearing ring and the threaded spindle, wherein the threaded spindle is supported counter to the application direction on the roller bearing.
10 . The support device as claimed in claim 1 , wherein the force-measuring device has a carrier body, wherein the carrier body rests on a first bearing surface of the ring-shaped body and on a second bearing surface of the axial bearing ring, wherein a sensor device is arranged on or in the carrier body, wherein the sensor device is designed to measure a deformation of the carrier body due to the action of a force.
11 . The support device as claimed in claim 10 , wherein raised portions that project in the axial direction and taper to a point in the axial direction are formed on the carrier body, wherein a first one of the raised portions is formed on a surface of the carrier body which faces the axial bearing ring, and a second of the raised portions is formed on a surface of the carrier body which faces the ring-shaped body, wherein the geometry of the first raised portion differs from the geometry of the second raised portion.
12 . The support device as claimed in claim 11 , wherein a groove matched to the geometry of the first raised portion is formed in the axial bearing ring on the surface facing the carrier body, wherein the first raised portion is supported in the groove.
13 . An electromechanical brake device for a motor vehicle comprising:
an electric motor drive for the provision of a torque,
a transmission assembly for converting the torque into an application force acting along the application direction of the brake device, and
a support device, for supporting the transmission assembly counter to the application direction comprising:
a clamping device for converting the force acting along an application direction into a clamping force acting on an element to be decelerated,
a force-measuring device for measuring a force acting on the support device along the application direction, and
a preloading device, wherein the preloading device together with the transmission assembly subjects the force-measuring device to a force acting along the application direction even in the absence of a force generated by the electric motor drive.
14 . The electromechanical brake device as claimed in claim 13 , wherein the brake device is one of a disk brake, and a floating caliper disk brake.
15 . The electromechanical brake device as claimed in claim 13 , wherein the brake device is a drum brake.
16 . The support device as claimed in claim 3 , wherein the at least one compression spring, is at least one of a helical spring and a Belleville spring.