US 12,227,154 B2
Electromechanical brake actuator and cam disc
Peter Beier, Wunstorf (DE); Arne Reiners, Hannover (DE); Jan Reiners, Hannover (DE); and Christoph Moritz, Hannover (DE)
Assigned to ZF CV Systems Europe BV, Brussels (BE)
Appl. No. 17/630,983
Filed by ZF CV Systems Europe BV, Brussels (BE)
PCT Filed Aug. 6, 2020, PCT No. PCT/EP2020/072117
§ 371(c)(1), (2) Date Jan. 28, 2022,
PCT Pub. No. WO2021/032494, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 10 2019 122 088.2 (DE), filed on Aug. 16, 2019.
Prior Publication US 2022/0297659 A1, Sep. 22, 2022
Int. Cl. B60T 13/74 (2006.01); F16D 55/2255 (2006.01); F16D 55/226 (2006.01); F16D 65/18 (2006.01); F16D 121/24 (2012.01); F16D 125/32 (2012.01); F16D 125/48 (2012.01); F16D 125/50 (2012.01)
CPC B60T 13/743 (2013.01) [F16D 55/2255 (2013.01); F16D 55/226 (2013.01); F16D 65/183 (2013.01); F16D 2121/24 (2013.01); F16D 2125/32 (2013.01); F16D 2125/48 (2013.01); F16D 2125/50 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electromechanical brake actuator (102, 202, 302, 402) for a brake, in particular a commercial vehicle disc brake, having:
an electric motor (106, 206) for generating a driving torque,
a cam disc (108, 108′, 108″, 208, 308, 408) which is rotatably mounted and operatively connected to the electric motor (106, 206), and
a brake plunger (114, 214, 314) configured to move along a plunger axis, for actuating a brake lever (358) of the brake (368),
wherein the cam disc (108, 108′, 108″, 208, 308, 408) and the brake plunger (114, 214, 314) have contact surfaces which bear against each other and slide or roll on each other for directly transmitting the driving torque from the cam disc (108, 108′, 108″, 208, 308, 408) to the brake plunger (114, 214, 314),
wherein the contact surface of the cam disc (108, 108′, 108″, 208, 308, 408) extends about a pivot point D at a radial distance r defined as a function r(φ) with a rate of change r′(φ) and dependent on an angular position φ of the cam disc (108, 108′, 108″, 208, 308, 408), and
wherein the contact surface is configured in such a way that there is a non-linear transfer between the driving torque of the cam disc (108, 108′, 108″, 208, 308, 408) and the force transmitted to the brake plunger (114, 214, 314), wherein the radial distance r(φ) is at its minimum for an angular position where φ=φmin and is at its maximum for an angular position where φ=φmax·,
wherein the rate of change r′(φ) is positive at least in certain regions in a first angular range φmin≤φ≤φmax, and in that the rate of change r′(φ) is negative at least in certain regions in a second angular range φmax≤φ≤360°,
wherein, in the first angular range φmin≤φ≤φmax, the function r(φ) has a first function profile r1(φ), and, in the second angular range φmax≤φ≤360°, has a second function profile r2(φ) which differs from r1(φ).