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DE-102024210844-A1 - Wheel brake system

DE102024210844A1DE 102024210844 A1DE102024210844 A1DE 102024210844A1DE-102024210844-A1

Abstract

The invention relates to a wheel brake assembly (1) for a braking system of a motor vehicle, comprising a brake holder (2), a brake caliper (3) slidably mounted on the brake holder (2), a controllable actuator (4), in particular an electric motor, connected to the brake caliper (3), a first brake pad (5) displaceable by means of the actuator (4), a second brake pad (6) displaceable by means of the brake caliper (3), in particular connected to the brake caliper (3), and a brake disc (7), wherein the brake pads (5, 6) are assigned to different sides (10, 11) of the brake disc (7) and are slidably mounted towards each other in order to generate a braking force. According to the invention, the wheel brake assembly (1) has at least one first reversing linkage (12), and the brake pads (5, 6) are spring-elastically coupled to each other by means of the linkage (12).

Inventors

  • Herbert Vollert
  • Jannis Tsoufios
  • Martin Winkler

Assignees

  • Robert Bosch Gesellschaft mit beschränkter Haftung

Dates

Publication Date
20260513
Application Date
20241112

Claims (15)

  1. Wheel brake assembly (1) for a braking system of a motor vehicle, - with a brake bracket (2), - with a brake caliper (3) slidably mounted on the brake bracket (2), - with a controllable actuator (4) connected to the brake caliper (3), in particular an electric machine, - with a first brake pad (5) displaceable by means of the actuator (4), - with a second brake pad (6) displaceable by means of the brake caliper (3), in particular connected to the brake caliper (3), and - with a brake disc (7), - wherein the brake pads (5, 6) are assigned to different sides (10, 11) of the brake disc (7) and are mounted so as to be displaceable towards each other in order to generate a braking force, characterized in that - the wheel brake device (1) has at least a first displacement-reversing linkage (12), and - that the brake pads (5, 6) are spring-elastically coupled to each other by means of the linkage (12).
  2. Wheel brake system according to Claim 1 , characterized in that the wheel brake device (1) has at least one gear arrangement (8), in particular a spindle gear, and that the first brake pad (5), in particular an actuating element (9) connected to the first brake pad (5), is operatively connected to the actuator (4) by means of the gear arrangement (8).
  3. Wheel brake device according to one of the preceding claims, characterized in that the first brake pad (5) and/or the second brake pad (6) is/are slidably mounted on the brake holder (3).
  4. Wheel brake device according to one of the preceding claims, characterized in that the wheel brake device (1) has at least one second linkage device (12) arranged at a distance from the first linkage device (12), in particular designed symmetrically to the first linkage device (12), and that the brake linings (5, 6) are each spring-elastically coupled to each other by means of the linkage devices (12).
  5. Wheel brake device according to one of the preceding claims, characterized in that the coupling mechanism (12) has a lever (13) or a gear which is rotatably mounted on the brake holder (2), in particular about an axis of rotation oriented transversely to a respective displacement direction of the brake linings (5,6).
  6. Wheel brake system according to Claim 5 , characterized in that the coupling mechanism (12) has a first and a second rack which are aligned parallel to each other and each engage with the gear, and that the first rack has a first end coupled to the first brake pad (5) and the second rack has a second end coupled to the second brake pad (6).
  7. Wheel brake system according to Claim 5 , characterized in that the lever (13) has a first end (16) coupled to the first brake pad (5) and a second end (17) coupled to the second brake pad (6), and that the lever (13) is rotatably mounted on the brake holder (2), in particular centrally, between the two ends (16,17).
  8. Wheel brake device according to one of the Claims 6 and 7 , characterized in that the lever (13) or at least one of the racks is designed to be elastically deformable at least in certain areas.
  9. Wheel brake device according to one of the Claims 5 until 8 , characterized in that the coupling mechanism (12) has at least one, in particular a first and a second, spring element (18,19), in particular a coil spring or elastomer, which is/are connected at one end to one of the ends (16,17), in particular to the first end (16), of the lever (13) or one of the racks, and at the other end to one of the brake pads (5,6) or the brake caliper (3).
  10. Wheel brake system according to Claim 9 , characterized in that the, in particular the first, spring element (18,19) is connected to the first brake pad (5) and/or the, in particular the second, spring element (18,19) is connected to the second brake pad (6).
  11. Wheel brake device according to one of the Claims 9 and 10 , characterized in that the brake caliper (3) has a U-shaped cross-section and a first and a second leg (20, 21), and that the first spring element (18) is connected to the first leg (20) and/or the second spring element (19) is connected to the second leg (21).
  12. Wheel brake device according to one of the Claims 9 until 11 , characterized in that the spring element (18,19) or at least one of the spring elements (18,19) is pushed at least partially at at least one end onto a projection (24) arranged on the lever (13), one of the racks, one of the brake linings (5,6) or the brake caliper (3).
  13. Wheel brake device according to one of the Claims 9 until 12 , characterized in that the spring element (18, 19) or at least one of the spring elements (18, 19) is at least partially inserted with at least one end into a the receptacle formed by the lever (13), one of the racks, one of the brake pads (5,6) or the brake caliper (3) is inserted.
  14. Wheel brake device according to one of the Claims 9 until 13 , characterized in that the spring element (18,19) or at least one of the spring elements (18,19) has a hook (25) at at least one end and is hooked into a hook receptacle (26), in particular a through hole, formed on the lever (13), one of the racks, one of the brake linings (5,6) or the brake caliper (3).
  15. Wheel brake device according to one of the Claims 5 until 14 , characterized in that the coupling mechanism (12) has at least one coupling rod (22) which is connected at one end to an end, in particular the first end (16), of the lever (13) or one of the racks, and at the other end to the brake caliper (3), to one of the brake pads (5, 6), in particular to the first brake pad (5), or to an actuating element (9) connected to the first brake pad (5), in particular to a radial projection of the actuating element (9).

Description

The invention relates to a wheel brake device for a braking system of a motor vehicle, comprising a brake holder, a brake caliper slidably mounted on the brake holder, a controllable actuator connected to the brake caliper, in particular an electric machine, a first brake pad slidable by means of the actuator, a second brake pad slidable by means of the brake caliper, in particular connected to the brake caliper, and a brake disc, wherein the brake pads are assigned to different sides of the brake disc and are slidably mounted towards each other in order to generate a braking force. State of the art Floating caliper brakes are known in the art and can be actuated hydraulically or purely electromechanically. The floating caliper, also known as the "fist," typically surrounds the brake disc. To utilize the reaction force of the actuator's actuation for braking, the second brake pad is displaceable by the caliper or supported by it. When the first brake pad is moved towards the brake disc by the actuator, the second brake pad is also pressed against the brake disc by the reaction force transmitted through the caliper. This type of coupling, however, is only a pressure coupling. During braking, the reaction force of the first brake pad, transmitted via the caliper, ensures that the caliper floats on the brake carrier when actuated by the floating guide. When the wheel brake system is disengaged, no braking torque should be applied. Therefore, after braking, the brake pads must be released from the brake disc. To do this, the brake caliper must be reset to ensure that both brake pads are no longer in contact with the brake disc. With hydraulic actuation, it is known to use a so-called quad ring with a rectangular cross-section as a sealing element for the first brake pad on a corresponding brake piston, because actively retracting the brake piston is not possible. The deformation that occurs when the brake piston is actuated pre-tensions the quad ring, causing the first brake pad to retract slightly with the piston. With purely electromechanical actuation, it is possible to actively retract the first brake pad. In known wheel brake systems, the brake caliper with the second brake pad cannot be actively reset; however, the brake disc usually exhibits runout and wobbles slightly and/or is slightly tilted due to the elasticity of the wheel bearing, so that the brake pads are pushed away from the brake disc by the corresponding wobbling motion. Reliable operation of this mechanism is not guaranteed, so a certain residual drag torque may remain. If the disc runout or tilt is sufficient, the brake pads are moved away from the brake disc; otherwise, they continue to rub against it. If the smooth movement of the brake caliper's floating guide is reduced, for example, due to contamination, the floating caliper brake typically retains some residual braking effect. Furthermore, it is generally desirable that the distance between each brake pad and the brake disc, the so-called brake pad clearance, is the same on both sides of the brake disc. This ensures minimal free play for the next application and thus allows both pads to contact the brake disc more quickly. Disclosure of the invention The wheel brake device according to the invention, with the features of claim 1, is characterized in that the wheel brake device has at least one first reversing linkage, and that the brake pads are spring-elastically coupled to each other by means of the linkage. This creates an advantageous positive guidance or positive coupling of the two brake pads, which ensures that, in an unactuated state of the wheel brake device, an equally sized air gap exists between both brake pads and the brake disc, thus centering them and completely preventing any residual rubbing torque. The limitations of known wheel brake devices mentioned at the outset are thereby completely eliminated. The invention demonstrates that it is possible to bring the brake pads, directly or indirectly via the brake caliper, into a spring-elastic and thus soft constrained condition by means of a linkage comprising spring-coupled and/or elastic materials. This is possible because, unlike hydraulic actuation, electromechanical actuation allows the first brake pad to be actively moved away from the brake disc, rather than pulling the brake pad, thus generating the force to move the floating caliper. This is achieved through the transmission. The mechanism ensures that the brake can be opened even with older or dirty brake calipers. Because the forces involved are generally quite small, the mechanism only needs to transmit minimal forces and can therefore be small and lightweight. The spring coupling is advantageous because it elegantly compensates for inaccuracies and elastic deflection. The spring coupling ensures a rigid connection up to a predetermined force or preload, followed by a soft connection. This is achieved, in particular, by using a separate spring element and/or a