Search

DE-102025112926-A1 - Friction brake system for a motor vehicle and motor vehicle

DE102025112926A1DE 102025112926 A1DE102025112926 A1DE 102025112926A1DE-102025112926-A1

Abstract

The invention relates to a friction brake device (10) for a motor vehicle, with at least two brake elements (26, 34, 38) rotatable relative to each other about a pivot axis (14), namely a first brake element (26, 38) having at least one first friction surface (28, 40) and at least one second brake element (34) having at least one second friction surface (36, 46), with an actuating element (20, 74, TB) which can be actuated by hydraulic actuation of the friction brake device (10) and thereby moved towards the second brake element (34) in a direction of movement extending in the axial direction of the friction brake device (10), whereby the first brake element (26, 38) can be actuated and thereby moved towards the second brake element (34) in the direction of movement, whereby the friction surfaces (28, 36, 40, 46) can be brought into mutual frictional contact to effect braking.

Inventors

  • Alexander von Gaisberg-Helfenberg
  • Jochen Haefner
  • Thomas Stolk

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20250402
Priority Date
20241108

Claims (10)

  1. Friction brake device (10) for a motor vehicle, comprising at least two brake elements (26, 34, 38) rotatable relative to each other about a pivot axis (14), namely a first brake element (26, 38) having at least one first friction surface (28, 40) and at least one second brake element (34) having at least one second friction surface (36, 46), with an actuating element (20, 74, TB) which can be actuated by hydraulic actuation of the friction brake device (10) and thereby moved towards the second brake element (34) in a direction of movement extending in the axial direction of the friction brake device (10), whereby the first brake element (26, 38) can be actuated and thereby moved towards the second brake element (34) in the direction of movement, whereby the friction surfaces (28, 36, 40, 46) can be brought into mutual frictional contact to effect braking, and with at least one a bimetallic spring element (52, 54) by means of which the first brake element (26, 38) can be actuated by means of the actuating element (20, 74, TB) and thereby moved in the direction of movement towards the second brake element (34), whereby the friction surfaces (28, 36, 40, 46) can be brought into mutual frictional contact to effect braking.
  2. Friction brake device (10) according Claim 1 , characterized in that the spring element (52, 54) is connected along the direction of movement on the one hand to the actuating element (20, 74, TB) and on the other hand to the first brake element (26, 38).
  3. Friction brake device (10) according Claim 1 or 2 , characterized in that the spring element (52, 54) is arranged along the direction of movement between the actuating element (20, 74, TB) and the first brake element (26, 38) and is thereby arranged in a force flow, via which a force resulting from the actuating of the actuating element (20, 74, TB) and intended for actuating the first brake element (26, 38) can be transmitted from the actuating element (20, 74, TB) via the spring element (52, 54) to the first brake element (26, 38), in series with the actuating element (20, 74, TB) and the first brake element (26, 38).
  4. Friction brake device (10) according to one of the preceding claims, characterized in that the spring element (52, 54) is arranged in a recess (56, 58) of the actuating element (20, 74, TB).
  5. Friction brake device (10) according to one of the preceding claims, characterized in that the spring element (52, 54) is designed as a disc spring.
  6. Friction braking device (10) according to one of the preceding claims, characterized in that the bimetal is formed from a first layer (S1) of a first metallic material and a second layer (S2) of a second metallic material arranged on the first layer (S1) that is different from the first metallic material.
  7. Friction brake device (10) according Claim 6 , characterized in that the first metallic material is zinc and the second metallic material is steel.
  8. Friction brake device (10) according Claim 6 or 7 , characterized in that the second layer (S2) faces the first braking element (26, 38)
  9. Friction brake device (10) according to one of the preceding claims, characterized in that the spring element (52, 54) is connected by means of several rivets (98, 100) to the first brake element (26, 38) on the one hand and to the actuating element (20, 74) on the other hand.
  10. Motor vehicle, with at least one friction brake device (10) according to one of the preceding claims.

Description

The invention relates to a friction braking device for a motor vehicle. The invention also relates to a motor vehicle with at least one such friction braking device. The DE 39 32 531 A1 It reveals a non-locking, hydraulic braking system. DE 10 2019 207 578 A1 A device for generating braking force in a motor vehicle is known. DE 10 2021 113 070 A1 A brake pad arrangement for a vehicle disc brake is known. Furthermore, the DE 10 2024 205 183 A1 A friction lining retraction device with free-travel compensation and residual braking torque avoidance for a motor vehicle wheel brake. Furthermore, the EP 0 195 081 B1 a self-adjusting device for a brake. The object of the present invention is to create a friction brake device for a motor vehicle and a motor vehicle with at least one such friction brake device, so that a particularly efficient operation can be achieved. This problem is solved by a friction brake device with the features of claim 1 and by a motor vehicle with the features of claim 10. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims. A first aspect of the invention relates to a friction brake device, also referred to simply as a brake device, for a motor vehicle, also referred to simply as a vehicle. Preferably, the friction brake device, which is also referred to simply as a brake, is a friction disc brake device, which is also referred to simply as a disc brake device or disc brake. The motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, has the friction brake device in its fully manufactured state. For example, the motor vehicle in its fully manufactured state has at least one vehicle wheel, also referred to simply as a wheel. The vehicle wheel is a ground contact element by means of which the motor vehicle can be supported or is supported downwards against a ground in the vertical direction of the motor vehicle. If the motor vehicle is driven along the ground while it is supported downwards in the vertical direction of the motor vehicle by means of the ground contact element, the ground contact element rolls, in particular directly, along the ground. The vehicle wheel is rotatable about a wheel axis relative to a housing of the motor vehicle, in particular the friction brake device, so that the vehicle wheel rotates about the wheel axis relative to the housing, especially when it rolls, particularly directly, on the ground. For example, the friction brake device can be used to brake, i.e., slow down, the vehicle wheel with respect to rotations about the wheel axis and relative to the housing, thereby braking, for example, the motor vehicle as a whole. The friction brake device is or constitutes a friction brake by means of which, for example, the vehicle wheel can be braked by friction. In particular, the friction brake device is or constitutes a service brake of the motor vehicle. The friction brake device comprises at least two brake elements rotatable relative to each other about an axis of rotation, namely a first brake element, which has at least one first friction surface, and a second brake element, which has at least one second friction surface. It is conceivable that the first brake element is a first brake disc element, that is, a first brake disc. Alternatively or additionally, for example, the second brake element is a second brake disc element, and thus a second brake disc. Within the scope of this disclosure, ordinal numbers, such as "first," "first," "second," "second," etc., are not necessarily used to indicate or imply a number of elements to which the ordinal numbers refer, but rather to enable unambiguous reference to the elements to which the ordinal numbers refer. It is conceivable that the second brake element, and thus the second friction surface, is rotatable about the axis of rotation relative to the first brake element, and thus relative to the first friction surface, and preferably relative to a reference element such as the housing. Furthermore, it is conceivable that the first brake element, and thus the first friction surface, is rotatable about the axis of rotation relative to the second brake element, and thus relative to the second friction surface, and preferably relative to the reference element. Thus, for example, one of the brake elements is rotatable about the axis of rotation relative to the other brake element and, in particular, also relative to the reference element. In particular, it is conceivable that one brake element, and thus the friction surface of one brake element, is connected or connectable to the vehicle wheel in a torque-transmitting, especially rotationally fixed manner, and that this can occur when the wheel rotates around its axis of rotation and relative to the housing. The friction brakes are rotatable with the vehicle wheel and thus rotatable about the axis of rotation relative to the other brake element, relative to the friction surfa