Vehicle Disc Brake

• US 20110127121A1
• Filed: 07/21/2009
• Published: 06/02/2011
• Est. Priority Date: 07/23/2008
• Status: Active Grant

• Current Assignee: Lucas Automotive GmbH (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Lucas Automotive GmbH (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Laubenthal, Frank, Zenzen, Guido, Hees, Dirk
• Granted Patent: US 8,905,201 B2
• Time in Patent Office: Days
• US Class Current: 188/72.3
• CPC Class Codes: F16D 2121/02 Fluid pressure
• CPC Class Codes: F16D 2121/24 using motors
• CPC Class Codes: F16D 2123/00 Multiple operation forces
• CPC Class Codes: F16D 55/22655 Constructional details of guide pins
• CPC Class Codes: F16D 55/227 by two or more pins
• CPC Class Codes: F16D 65/18 adapted for drawing members together , e.g. for disc brakes

Abstract

Vehicle disk brake designed as a service brake and as a parking- or immobilizing brake, having a brake anchor plate, which is to be fastened to the chassis of a motor vehicle by means of at least one screw bolt and in which two guide bolts are accommodated in order to guide a brake caliper displaceably relative to the brake anchor plate, and having a hydraulic chamber, in which a brake piston is accommodated in order to bring friction linings into and out of frictional engagement with a brake disk. A separately manipulable assembly is built onto the vehicle disk brake and has an electric motor as well as an electronic control and power device in order, independently of a hydraulic actuation of the brake piston, to actuate the brake piston via a rotary-to-linear motion converter in the sense of bringing the friction linings into and out of engagement with the brake disk. In order to create the extra space required by the use of a smart actuator for the parking brake unit in the internal wheel contour of compact vehicles, modifications to existing and tried-and-tested components are undertaken, which simultaneously improve the accessibility for maintenance purposes.

Claims

1. Vehicle disk brake, which is designed as a service brake and as a parking and/or immobilizing brake, comprising

a brake anchor plate, which is to be fastened to the chassis of a motor vehicle by means of at least one fastening screw bolt and in which two guide bolts are accommodated in order to guide,

a brake caliper displaceably relative to the brake anchor plate,

an actuating element for bringing friction linings into and out of frictional engagement with a brake disk,

a separately manipulable assembly that is built onto the vehicle disk brake and comprises,

an electric motor in order via a rotary-to-linear motion converter to actuate the actuating element in the sense of bringing the brake linings into and out of frictional engagement with the brake disk, wherein

a location hole for one of the two guide bolts of the brake caliper and/or for the at least one fastening screw bolt of the brake anchor plate is closer in radial direction to the axis of rotation of the brake disk than a location hole for the other guide bolt and/or the other fastening screw bolt.

2. Vehicle disk brake according to claim 1, wherein the service brake is a hydraulic service brake.

3. Vehicle disk brake according to claim 1, wherein the actuating element comprises a hydraulic chamber, in which a brake piston is accommodated.

4. Vehicle disk brake according to claim 1, wherein in the assembly built onto the vehicle disk brake an electronic control and power unit is at least partially accommodated for supplying the electric motor with control and/or power signals.

5. Vehicle disk brake according to claim 1, comprising two guide bolts for the brake caliper on the brake anchor plate and two fastening screw bolts for the brake anchor plate on the chassis, wherein the four bolts and/or their location holes viewed in an axial direction define an imaginary asymmetrical quadrangle.

6. Vehicle disk brake according to claim 1, wherein one of the two guide bolts is disposed radially further in than the other.

7. Vehicle disk brake according to claim 6, wherein the guide bolt disposed radially further in has a smaller diameter than the other guide bolt.

8. Vehicle disk brake according to claim 1, wherein the extent, by which the location hole for the one guide bolt is to be positioned in radial direction closer to the axis of rotation of the brake disk than the location hole for the other guide bolt is ca. 150% to ca. 50% of the distance of a location hole for the other guide bolt from the location hole directly adjacent thereto for the fastening screw bolt.

9. Vehicle disk brake according to claim 1, wherein the distance between the location hole for the one guide bolt and the location hole directly adjacent thereto for the fastening screw bolt is ca. 10% to ca. 50% of the distance between the location hole for the other guide bolt and the location hole directly adjacent thereto for the fastening screw bolt.

10. Vehicle disk brake according to claim 1, wherein the brake caliper comprises a flange projecting in radial direction, in which a through-opening is provided for receiving a screw bolt.

11. Vehicle disk brake according to claim 10, wherein the guide bolt comprises a head region, disposed in which is a threaded bore, which is oriented coaxially with the shank of the guide bolt and to which the brake caliper is to be screw-connected by means of the screw bolt.

12. Vehicle disk brake, which is designed as a service brake and as a parking and/or immobilizing brake, comprising

a brake anchor plate, which is to be fastened to the chassis of a motor vehicle by means of at least one fastening screw bolt and in which two guide bolts are accommodated in order to guide,

a brake caliper displaceably relative to the brake anchor plate,

an actuating element for bringing friction linings into and out of frictional engagement with a brake disk,

a separately manipulable assembly that is built onto the vehicle disk brake and comprises,

an electric motor in order via a rotary-to-linear motion converter to actuate the actuating element in the sense of bringing the brake linings into and out of frictional engagement with the brake disk, wherein

one of the two guide bolts and/or the at least one fastening screw bolt projects in axial direction relative to the other guide bolt in axial direction to a lesser extent from the brake caliper, and is devised so as to serve in the absence of the other guide bolt as a pivot bearing for the brake caliper with the parking brake assembly built thereon.

13. Vehicle disk brake according to claim 12, wherein the service brake is a hydraulic service brake.

14. Vehicle disk brake according to claim 12, wherein the actuating element comprises a hydraulic chamber, in which a brake piston is accommodated.

15. Vehicle disk brake according to claim 12, wherein in the assembly built onto the vehicle disk brake an electronic control and power device is at least partially accommodated in order to supply the electric motor with control and/or power signals.

16. Vehicle disk brake according to claim 12, wherein the hydraulic chamber, in which the brake piston is accommodated in a sealing and axially longitudinally displaceable manner, is situated in the brake caliper and wherein to supply the hydraulic chamber with hydraulic fluid a brake pressure generating unit is used, the actuation of which pressurizes the hydraulic fluid in the hydraulic chamber, with the result that the brake piston shifts axially in order to bring friction linings into frictional engagement with a brake disk.

17. Vehicle disk brake according to claim 12, wherein the assembly comprises a gear, with which a rotary-to-linear motion converter is associated.

18. Vehicle disk brake according to claim 12, wherein the electric motor is disposed in such a way that its output shaft extends approximately parallel to the axis of displacement of the brake piston and exits from the housing of the electric motor at the side remote from the brake piston.