DE102021105318B3 - Braking device for a wheel hub drive arrangement - Google Patents

Abstract

Braking device (1) for a wheel hub drive arrangement (2), the wheel hub drive arrangement (2) having at least one drive shaft (3) with an axis of rotation (5) extending along an axial direction (4); wherein the braking device (1) comprises at least one housing section (6) for arranging the braking device (1) on the wheel hub drive assembly (2) and in the housing section (6) for arranging on the drive shaft (3) coaxially to the axis of rotation (5) and at least one first element (7), one brake disc (8) and one second element (9) arranged next to one another along the axial direction (4); wherein the brake disc (8) has at least one hub part (13) that can be positively connected to the drive shaft (3) relative to a circumferential direction (14), a carrier element (12) that is non-rotatably connected to the hub part (13), and on the carrier element (12) one dem covering (10) facing the first element (7) and the second element (9) for contacting the elements (7, 9).

Description

The invention relates to a braking device for a wheel hub drive arrangement. The invention also relates to a wheel hub drive arrangement with a braking device, in particular for a motor vehicle.

Motor vehicles with hybridised/ electrified powertrains can accelerate and decelerate with the help of the e-machine. During the braking process, the e-machine is operated as a generator and the recuperated energy is used to charge the battery. For safety reasons, however, a second, mechanical braking device is still required. In the case of drives close to the wheel (wheel hub motor/electric axle), this results in a more difficult installation space situation. In addition, it is desirable to design the mechanical brake to be durable, since dismantling the brake for servicing can be difficult.

In a vehicle, in particular a vehicle with an electric wheel hub drive, a so-called e-wheel drive, brakes with disks are often used to brake the vehicle. However, brakes designed as disc brakes with floating calipers, disc brakes with fixed calipers, drum brakes and multi-disc brakes are also known.

For example, describes the DE 10 2012 200 668 A1 a wheel drive on a vehicle axle, with a driven wheel hub rotatably mounted on a wheel hub carrier and with at least one hydraulically actuated multi-disc brake for braking the wheel hub. An outer disk is arranged as a rotating part of the disk brake in a rotationally fixed and axially displaceable manner on the wheel hub.

From the DE 10 2019 120 409 A1 a braking device for a wheel hub drive arrangement is known, in which the braking partners which are fixed with respect to the circumferential direction have cooling ducts. The axially moveable braking partner is actuated via brake cylinders. The braking partner that can be moved in the circumferential direction is designed as a disk carrier.

From the DE 10 2019 118 503 A1 a braking device for a wheel hub drive arrangement is known, in which an inner disk is arranged as a rotating part of the disk brake in a rotationally fixed and axially displaceable manner on the wheel hub.

With such mechanical brakes, the braking partner that can be moved in the circumferential direction is regularly connected via a positive connection, e.g. B. a spline on a hub connected to a drive shaft. As soon as the brake is actuated and a torque is transmitted via the hub to the drive shaft, frictional forces (displacement friction) occur in the toothing between the hub and the drive shaft. These frictional forces prevent displacement of the hub relative to the drive shaft in the axial direction, so that only a reduced contact pressure force is available for the frictional contact between the movable friction partner and the stationary friction partner provided for torque transmission. In addition, a misalignment of the moving braking partner can occur, which can result in an uneven application of force and possibly noise.

Proceeding from this, the object of the present invention is to at least partially alleviate the problems described at the outset. In particular, a braking device is to be proposed which enables transmission of a contact pressure force which is distributed uniformly and is not reduced if possible.

This object is achieved with the features of independent claim 1. Further advantageous refinements of the invention are specified in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technologically meaningful manner and can define further refinements of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, with further preferred configurations of the invention being presented.

A braking device for a wheel hub drive arrangement, in particular for a motor vehicle with an electric wheel hub drive, is proposed. The wheel hub drive arrangement preferably has an electric drive for driving a wheel of the motor vehicle, with the braking device being designed for braking this wheel.

The wheel hub drive arrangement has at least one drive shaft with an axis of rotation extending along an axial direction. The braking device comprises at least one housing section for arranging the braking device on the wheel hub drive arrangement. Furthermore, the braking device comprises in the housing section, for arrangement on the drive shaft, coaxially to the axis of rotation and arranged next to one another along the axial direction, at least a first element, a brake disk and a second element. The brake disc has at least one hub part that can be connected in a form-fitting manner to the drive shaft relative to a circumferential direction, and a carrier element that is connected to the hub part in a rotationally fixed manner and on the carrier element in each case a covering facing the first element and the second element for contacting the elements. The braking device has an actuating device for displacing the first element along the axial direction towards the second element. The carrier element is elastically deformable (only) in the axial direction at least in a region between the linings and the hub part.

In particular, the elements are (essentially) non-rotatably connected to the housing section. The brake disc is arranged in the brake device so that it can rotate with respect to the elements and with respect to the housing section and can be connected to the drive shaft in a rotationally fixed manner with respect to the circumferential direction via the hub part. The brake disc can be clamped adjustably between the elements by actuating the actuating device, so that a torque can be supported via the elements on the housing section. A torque of the drive shaft can thus be transmitted via the braking device via the brake disk and supported via the elements on the housing section, so that the drive shaft can be braked when the braking device is actuated.

The components arranged in the housing section with the drive shaft so as to be rotatable relative to the circumferential direction are the hub part, a carrier element and, if necessary, fastening elements for connecting the carrier element to the hub part.

The carrier element enables the linings to be displaced along the axial direction relative to the hub part when the braking device is actuated by the actuating device.

When the braking device is actuated, a torque acting in the circumferential direction is transmitted between the hub part and the drive shaft. B. in a spline present there, frictional forces (displacement friction) occur. The result of these frictional forces is that the frictional contact between a component that is connected to the hub part and is designed to be dimensionally stable and the second element that is stationary with respect to the axial direction could only be subjected to a reduced contact pressure.

Due to the carrier element that is deformable in the axial direction and is connected to the hub part, the coverings can be shifted along the axial direction without friction. In this way, an uneven application of force and noise occurring due to the misalignment can be prevented.

As a result of the prevention of displacement friction when the brake is actuated, in particular no loss of pressing force has to be accepted, so that improved controllability of the pressing force can also be achieved.

In this way, in particular, a braking device that is maintenance-free over the service life can be implemented.

In particular, the carrier element is a spring plate that can be deformed at least in relation to the axial direction.

The carrier element is connected to the hub part via at least one connection, preferably via a plurality of connections distributed along the circumferential direction.

The connection is in particular a riveted connection. However, other types of connection, screw connection, welded connection, etc., are also possible.

In particular, the coverings are arranged at a distance from the at least one connection in a radial direction, with the area extending circumferentially along the circumferential direction and in the radial direction at least between the at least one connection and the coverings. Within the (spatial) area, the carrier element is designed to be elastically deformable, in particular deformable in the axial direction. The linings can thus be displaced with the sections of the carrier element carrying the linings along the axial direction relative to the hub part and/or the at least one connection and/or the section of the carrier element connected to the hub part via the connection.

In particular, the carrier element is designed at least partially in the shape of a segment of a circle. In particular, the individual circle segments are each arranged at a distance from one another along the circumferential direction by a gap running at least in a radial direction. In particular, the gap extends from an outer circumference of the carrier element into the area, but preferably not as far as an inner circumference, so that the carrier element is arranged on the hub part via a circular ring-shaped section.

The brake disc consists at least of the hub part, the carrier element and the coverings, e.g. B. base pads and/or base rings. The coverings are form-fitting or material-to-material connected to the support element. The carrier element can be designed with radial gaps in order to connect the coverings more flexibly (e.g. to compensate for tolerances/tilts of the coverings in relation to the elements). The carrier element can be deformed softly or elastically in the axial direction, so that the effects of displacement friction between the hub part and the drive shaft can be minimized (improved controllability of the actuating device, no loss of actuating force). Furthermore, an additional sheet metal or the carrier element itself can be used to implement cushioning resilience, which enables the coverings to be carried evenly and also helps to compensate for misalignments. The carrier element is in particular connected to the hub part in a form-fitting manner (e.g. via rivets).

The hub part and the elements are in particular dimensionally stable components, ie components which cannot be deformed under the usual operating conditions of the braking device. In contrast, the carrier element is elastically deformable at least in relation to the axial direction.

In particular, the second element is supported on the housing section in relation to the axial direction. In particular, the second element is supported on the housing section via a cam of the housing section, which is in particular configured to run around in the circumferential direction.

In particular, the second element is supported on the housing section via a cam ring.

In particular, the cam or the cam ring is crowned at the contact surface with the second element, so that a tilting movement of the second element is possible to compensate for deformation and/or potting effects.

In particular, the cam ring has a contact surface for contacting the second element, the cam ring having a first ramp which interacts with a second ramp on the housing section, so that when the cam ring rotates relative to the housing section, the contact surface can be displaced along the axial direction. Ramps with a pitch can be formed both on the cam ring and on the housing section. A stroke in the axial direction results from the relative rotation of the cam ring to the housing section. In combination with a spindle drive that is accessible from outside the housing section (for initiating the relative rotation), wear on the linings during operation of the braking device can be compensated for.

In particular, at least one element (preferably the first or the second or both elements) is connected to the housing section via at least one leaf spring. The leaf spring extends between the housing section and the respective element, in particular essentially along the circumferential direction. About the leaf spring z. B. a centering of the element relative to the axis of rotation can be achieved, so that a sliding friction between the housing portion and the element can be prevented. Next, a leaf spring against the axial direction backlash, z. B. biased arrangement of the element, z. B. on or opposite the housing section and/or on or opposite the actuating device. A corrugated spring can also be used instead of the at least one leaf spring.

In particular, a mass of at least one element (preferably each element) is greater by a factor of at least 1.5, preferably at least 2.0, particularly preferably 2.5, than a mass of the carrier element.

The thermal mass of the braking device is realized here by two (non-rotating) elements, preferably steel plates, one on each side of the brake disc (the carrier element).

In particular, the first element is connected via at least one leaf spring so as to be displaceable in relation to the axial direction in relation to the housing section. The at least one leaf spring takes over in particular the transmission of torque to the housing section and enables a play-free connection between the element and the housing section and/or the actuating device, as a result of which noises can be avoided.

The installation position of the at least one leaf spring should be chosen so that the center of the leaf spring is between the attachment point of the leaf spring on the element and the attachment point on the housing section in the friction plane (covering/steel plate contact) in order to prevent noise phenomena.

The second member is positioned opposite the axial direction via the housing portion, a cam, or an adjustable cam ring. Alternatively, the torque can be transmitted from the second element to the housing via leaf springs or in a form-fitting manner via the cam ring. The axial installation position of the second element can be adjusted via the cam ring, which means that the material thickness (thermal mass) can be freely selected and adapted to the respective requirements.

In particular, at least one covering is designed in the shape of a segment of a circle or a circular ring. In the case of a configuration in the form of a segment of a circle, a plurality of the respective covering components can be distributed along the circumferential direction.

The covering is in particular connected to the carrier element in a form-fitting or material-locking manner and can be designed as a segment or as a circular segment or as a circular ring (that is to say circumferential). As a result, the specific load, the deformability in relation to the axial direction and the wear volume of the lining can be influenced.

In particular, the actuating device has a single-piston releaser, a multi-piston releaser or a hydraulically actuated annular cylinder with an annular piston. The actuating device can be actuated hydraulically or electrically. Such actuators are z. B. for actuating braking devices and / or friction clutches are known in principle.

If several pistons are provided, they can be distributed uniformly along the circumferential direction.

The actuating device can be integrated in the housing section or at least partially arranged outside of the housing section.

When the actuating device is actuated, pressure is applied to a piston (e.g. hydraulically or else by electromechanical displacement) and displaced along the axial direction, so that a contact pressure force of the actuating device acts on the first element. The brake disk or the carrier element with the linings is pressed against the second element by the first element and is thus clamped. The actuating or pressing force is supported via the at least one piston and the associated cylinder and ultimately via the housing section. For this purpose, a cylinder of the actuating device can be screwed into a wall of the housing section or arranged in a different way to be integrated or fastened.

The actuating device comprises in particular a cylinder, a piston that can be moved therein and a seal between the piston and the cylinder. The restoring force on the piston, ie for moving the piston away from the first element, can result from the seal itself or the piston can be pushed back via a spring element arranged on the first element.

The piston or the releaser can be crowned on a contact surface with the first element, so that a slight tilting movement of the piston, the releaser and/or the first element is made possible to compensate for deformation or potting effects.

The braking device can have a hydraulic device for generating the braking force or pressing force. The hydraulic device preferably generates the braking force via a pressure difference in a fluid, in particular oil. The braking device for the wheel hub drive arrangement is preferably designed as a hydraulically actuable brake. For example, the braking device can be actuated by hydraulic actuation, e.g.

Alternatively, an electromechanically acting actuating device can be provided, with the piston or releaser being displaced via an electric motor, e.g. B. via a known swash plate. The motor can be arranged inside or outside of the housing section.

The contact pressure/braking force generated by the actuating device can, for. B. via a pressure pot to the at least one first element can be and / or are transmitted. The pressure pot is preferably designed in the shape of a plate and is arranged coaxially and/or concentrically with respect to the axis of rotation. The pressure pot preferably has an inner and an outer diameter, the first element being arranged adjacent to the outer diameter of the pressure pot and the hydraulic device being arranged adjacent to the inner diameter of the pressure pot. The pressure pot preferably transmits the braking force in the axial direction with respect to the axis of rotation from the hydraulic device to the first element. In particular, the pressure pot is embodied as a spring-elastic disc, the braking force being and/or being transferable from the pressure pot all the way round to the first element. For example, the pressure pot presses on a rear side surface of the first element pointing in the axial direction, with the (front) side surface facing away from it being able to contact the covering arranged on the carrier element.

A known prestressing device can be provided for prestressing the pressure pot. The prestressing device preferably has one or more spring elements for generating and/or storing a prestressing force, with the spring element preferably being supported on the pressure pot. The prestressing device acts in the axial direction with respect to the axis of rotation of the stroke movement of a piston of the actuating device against. For example, when the piston is disengaged from the cylinder, the spring element is tensioned by the axial displacement of the pressure pot, and when the braking device is released the pressure pot pushes the piston back into the cylinder due to the stored biasing force of the spring element.

The second element is arranged in a supporting manner on the housing section against the braking force. In particular, the second element is supported in the axial direction on the housing section. The second element is preferably non-positively connected to the housing section. In particular, the second element is arranged in a fixed position on the housing section.

In particular, the first element presses in the axial direction with respect to the axis of rotation against the brake disc or against the linings of the carrier element, the linings or the carrier element being displaceable against the positionally fixed second element, the linings being clamped between the first and second elements become and/or can be pinched.

A wheel hub drive arrangement is also proposed, at least comprising an electric drive and a drive shaft that can be driven by it, with an axis of rotation extending along an axial direction, for connection to (only) one wheel of a motor vehicle, the electric drive and at least partially the drive shaft being arranged in a housing are. The wheel hub drive arrangement has the braking device described for braking the drive shaft as required.

The braking device can be arranged on the wheel hub drive arrangement via the housing section. In particular, the housing section is connected to a housing of the wheel hub drive arrangement and/or integrated at least partially or completely in the housing of the wheel hub drive. In particular, the housing section forms an installation space in the wheel hub drive arrangement in which the braking device is formed. Alternatively or optionally in addition, the housing section is designed to close off an installation space of the wheel hub drive arrangement, for example the installation space for the drive.

The wheel hub drive arrangement is designed in particular as an electric wheel hub drive for a motor vehicle, in particular for an electric vehicle, the wheel hub drive arrangement being arranged on one or on each wheel, preferably on (all) four wheels, of the motor vehicle for driving the motor vehicle. The wheel hub drive arrangement preferably has an electric drive (an electric machine) for generating a drive torque. The wheel hub drive arrangement is preferably installed or can be installed inside the wheel, in particular inside a wheel rim, of the motor vehicle.

In a known manner, the wheel hub drive arrangement can comprise a transmission, via which the electric drive is connected to the drive shaft.

The statements regarding the braking device apply in particular to the wheel drive device and vice versa.

The use of indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral. Correspondingly introduced terms or components are to be understood in such a way that they are present at least once and in particular can also be present several times.

As a precaution, it should be noted that the numerals used here (“first”, “second”, ...) primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and/or sequence of these objects, sizes or make processes mandatory for each other. Should a dependency and/or order be necessary, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described embodiment. If a component can occur several times (“at least one”), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory.

• 1: ein Kraftfahrzeug mit einer Radnabenantriebsanordnung in einer perspektivischen Ansicht im Schnitt und einen vergrößerten Ausschnitt der Bremsvorrichtung in einer Seitenansicht im Schnitt;
• 2: die Bremsvorrichtung nach 1 in einer Seitenansicht im Schnitt;
• 3: eine Bremsscheibe der Bremsvorrichtung nach 2, in einer perspektivischen Ansicht;
• 4: die Bremsscheibe nach 3 in einer Seitenansicht im Schnitt,
• 5: eine andere Ausführungsvariante einer Bremsvorrichtung in einer Seitenansicht im Schnitt; und
• 6: die Bremsvorrichtung nach 5 mit einem Antrieb der Betätigungseinrichtung in einer perspektivischen Ansicht.

The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be pointed out that the invention should not be limited by the exemplary embodiments given. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. Show it:

• 1 1: a motor vehicle with a wheel hub drive arrangement in a perspective view in section and an enlarged section of the braking device in a side view in section;
• 2 : the braking device after 1 in a side view in section;
• 3 : a brake disc according to the braking device 2 , in a perspective view;
• 4 : the brake disc after 3 in a side view in section,
• 5 1: another embodiment variant of a braking device in a side view in section; and
• 6 : the braking device after 5 with a drive of the actuating device in a perspective view.

1 shows a motor vehicle 23 with a wheel hub drive arrangement 2 in a perspective view in section and an enlarged detail of the braking device 1 in a side view in section. The motor vehicle 23 is designed as an electric vehicle or an electric car. The wheel hub drive arrangement 2 serves to drive and brake a wheel 22 of the motor vehicle 23. For example, the motor vehicle 23 has at least two, preferably exactly four wheels 22, which can each be driven or braked via a separate wheel hub drive arrangement 2.

The wheel hub drive arrangement 2 comprises an electric drive 21 and a drive shaft 3 which can be driven by it and has an axis of rotation 5 extending in an axial direction 4 for connection to a wheel 22 of the motor vehicle 23, the electric drive 21 and the drive shaft 3 being located in the housing 24 of the wheel hub drive arrangement 2 are arranged. The wheel hub drive arrangement 2 has the braking device 1 for braking the drive shaft 3 as required.

The brake device 1 has a housing portion 6 for accommodating the brake device 1 and supporting the brake device 1 on the wheel hub drive assembly 2 . The housing section 6 is designed in the shape of a plate and/or pot and is designed around an axis of rotation 5 . For example, the housing section 6 is designed to be rotationally symmetrical about the axis of rotation 5 , with the axis of rotation 5 being arranged coaxially to the drive shaft 3 of the wheel hub drive arrangement 2 and the wheel 22 . The housing section 6 is designed for flanging the braking device 1 onto the wheel hub drive arrangement 2 . The housing section 6 is partially open to the outside in the radial direction 26 (see also 6 ). The arrangement and design of a housing section 6 on the wheel drive assembly is known in principle.

2 shows the braking device 1 1 in a side view in section. The braking device 1 comprises at least one housing section 6 for arranging the braking device 1 on the wheel hub drive assembly 2. The braking device 1 further comprises in the housing section 6, for arranging on the drive shaft 3, coaxially to the axis of rotation 5 and arranged next to one another along the axial direction 4, at least a first Element 7, a brake disc 8 and a second element 9. The brake disc 8 has at least one hub part 13 which can be positively connected to the drive shaft 3 with respect to a circumferential direction 14, a carrier element 12 which is non-rotatably connected to the hub part 13 and on the carrier element 12 a respective first element 7 and the second element 9 facing covering 10 for contacting the elements 7, 9 on. The braking device 1 has an actuating device 11 for displacing the first element 7 along the axial direction 4 towards the second element 9 . The carrier element 12 is elastically deformable (only) in the axial direction 4 at least in a region 35 between the coverings 10 and the hub part 13 .

The elements 7, 9 are essentially non-rotatably connected to the housing section 6. The brake disc 8 is arranged in the braking device 1 so that it can rotate relative to the elements 7 , 9 and relative to the housing section 6 and is connected to the drive shaft 3 in a rotationally fixed manner relative to the circumferential direction 14 via the hub part 13 . The brake disk 8 can be clamped between the elements 7 , 9 in an adjustable manner by actuating the actuating device 11 , so that a torque can be supported on the housing section 6 via the elements 7 , 9 . A torque of the drive shaft 3 can thus be transmitted via the braking device 1 via the brake disc 8 and supported on the housing section 6 via the elements 7, 9, so that the drive shaft 3 can be braked when the braking device 1 is actuated.

The components arranged in the housing section 6 with the drive shaft 3 so that they can rotate relative to the circumferential direction 14 are the hub part 13, a carrier element 12 and, if necessary, fastening elements 28 for connecting the carrier element 12 to the hub part 13.

When the braking device 1 is actuated by the actuating device 11, the carrier element 12 enables a displacement of the pads 10 along the axial direction 4 relative to the hub part 13.

When the braking device 1 is actuated, a torque acting in the circumferential direction 14 is transmitted between the hub part 13 and the drive shaft 3, with the hub part 13 and the drive shaft 3 having the wedge toothing present there 27 Frictional forces (displacement friction) occur. The result of these frictional forces is that the frictional contact between a component which is connected to the hub part 13 and is dimensionally stable and the second element 9 which is stationary relative to the axial direction 4 could only be subjected to a reduced contact pressure.

Due to the support element 12, which is deformable in the axial direction 4 and is connected to the hub part 13, the pads 10 can be displaced along the axial direction 4 without frictional displacement, with additional angular offsets or component misalignments being able to be compensated by the elastically deformable support element 12. In this way, an uneven application of force and noise occurring due to the misalignment can be prevented.

The hub part 13 and the elements 7, 9 are dimensionally stable components, ie components that cannot be deformed under the usual operating conditions of the braking device 1. In contrast, the carrier element 12 is elastically deformable at least with respect to the axial direction 4 .

The second element 9 is supported on the housing section 6 in relation to the axial direction 4 . The second element 9 is supported on the housing section 6 via a cam ring 29 .

The cam ring 29 is crowned at the contact surface 36 with the second element 9, so that a tilting movement of the second element 9 is possible to compensate for deformation and/or potting effects.

Cam ring 29 has a contact surface 36 for contacting second element 9, cam ring 29 having a first ramp 33 (only indicated) which interacts with a second ramp 34 (only indicated) on housing section 6, so that when the Cam ring 29 relative to the housing section 6, the contact surface 36 is displaceable along the axial direction 4. Both the cam ring 29 and the housing section 6 are therefore ramps 33, 34 formed with a slope. Relative rotation of the cam ring 29 to the housing section 6 results in a stroke in the axial direction 4. In combination with a spindle drive accessible from outside the housing section 6 (to initiate the relative rotation), wear on the linings 10 during operation of the braking device 1 can be compensated.

Both elements 7, 9 are each connected to the housing section 6 via at least one leaf spring 18 (only indicated). The leaf spring 18 extends between the housing section 6 and the respective element 7, 9 essentially along the circumferential direction 14. The leaf spring 18 can, for. B. a centering of the element 7, 9 relative to the axis of rotation 5 can be achieved, so that a sliding friction between the housing section 6 and the element 7, 9 can be prevented. Next, a leaf spring 18 against the axial direction 4 backlash, z. B. biased arrangement of the element 7, 9, z. B. on or opposite the housing section 6 and / or on or opposite the actuating device 11 can be guaranteed.

The thermal mass of the braking device 1 is realized by two (non-rotating) elements 7, 9, one on each side of the brake disc 8, ie the carrier element 12 is arranged.

The second element 9 is positioned in relation to the axial direction 4 via an adjustable cam ring 29 which is supported on the housing section 6 . Torque can be transmitted from the second element 9 to the housing section 6 via leaf springs 18 or in a form-fitting manner via the cam ring 29 . The axial installation position of the second element 9 can be adjusted via the cam ring 29, as a result of which the material thickness of the second element 9 (thermal mass) can be freely selected and adapted to the respective requirements.

The actuating device 11 has a hydraulically actuable circular ring cylinder 31 with a circular ring piston 30 . The actuating device 11, comprising the channel 16 for supplying the hydraulic fluid to the cylinder 31, the piston 30 and the cylinder 31, is arranged in the housing section 6 in an integrated manner.

When actuating device 11 is actuated, pressure is applied to piston 30 and it is displaced along axial direction 4 , so that a contact pressure force of actuating device 11 acts on first element 7 . The brake disk 8 or the carrier element 12 with the linings 10 is pressed against the second element 9 by the first element 7 and is thus clamped. The actuating or pressing force is supported via the piston 30 and the associated cylinder 31 and ultimately via the housing section 6 .

The actuating device 11 comprises the cylinder 31, the piston 30 that can be moved therein and a seal 32 between the piston 30 and the cylinder 31. The restoring force on the piston 30, i.e. for the displacement of the piston 30 away from the first element 7, can come from the seal 32 itself emerge or the piston 30 can have a spring element arranged on the first element 7 or by the leaf spring 18 arranged on the housing section can be pushed back or pulled back.

The pressing force/braking force generated by the actuating device 11 is transmitted to the first element 7 via a pressure pot 17 . The pressure pot 17 is plate-shaped and arranged coaxially with respect to the axis of rotation 5 . The pressure pot 17 has an inner diameter 19 and an outer diameter 20 , the first element 7 being arranged adjacent to the outer diameter 20 of the pressure pot 17 and the piston 30 being arranged adjacent to the inner diameter 19 of the pressure pot 17 . The pressure pot 17 transmits the braking force in the axial direction 4 in relation to the axis of rotation 5 from the hydraulic device to the first element 7. The pressure pot 17 presses on a rear surface of the first element 7 pointing in the axial direction 4, with the side facing away from it (front -) side surface of the arranged on the carrier element 12 covering 10 is contactable.

3 shows a brake disk 8 of the braking device 1 2 in a perspective view. 4 shows the brake disc 8 3 in a side view in section. the 3 and 4 are described together below. On the remarks on the 1 and 2 is referenced.

The carrier element 12 can be a spring plate that can be deformed at least with respect to the axial direction 4 .

The carrier element 12 is connected to the hub part 13 via a plurality of connections 15 distributed along the circumferential direction 14 . The connection 15 is a riveted connection.

The coverings 10 are spaced from the connections 15 in a radial direction 26 , with the area 35 extending circumferentially along the circumferential direction 14 and in the radial direction 26 between the connections 15 and the coverings 10 . Within the (spatial) region 35 the carrier element 12 is designed to be elastically deformable in the axial direction 4 . The pads 10 with the sections of the carrier element 12 carrying the pads 10 can be displaced along the axial direction 4 relative to the hub part 13 and the connections 15 and the section of the carrier element 12 connected to the hub part 13 via the connections 15 .

The carrier element 12 is designed at least partially in the shape of a segment of a circle. The individual circle segments 37 are each arranged at a distance from one another along the circumferential direction 14 by a gap 38 running at least in a radial direction 26 . The gap 38 extends from an outer circumference of the carrier element 12 into the area 35, but not as far as an inner circumference, so that the carrier element 12 is arranged on the hub part 13 via a circular ring-shaped section.

The brake disc 8 consists of the hub part 13, the carrier element 12, the fasteners 28 and the pads 10, z. B. base pads and/or base rings. The coverings 10 are connected to the carrier element 12 in a form-fitting or material-fitting manner. The carrier element 12 is designed with radial gaps 38 in order to connect the coverings 10 more flexibly (e.g. to compensate for tolerances/skewing of the coverings 10 in relation to the elements 7, 9). The carrier element 12 is soft or elastically deformable in the axial direction 4, so that displacement friction effects between the hub part 13 and the drive shaft 3 can be minimized (improved controllability of the actuating device 11, no loss of actuating force).

5 shows another embodiment variant of a braking device 1 in a side view in section. 6 shows the braking device 1 5 with a drive of the actuating device 11 in a perspective view. the 5 and 6 are described together below. On the remarks on the 1 until 4 is referenced.

In this embodiment variant, an electromechanically acting actuating device 11 is provided, with the piston 30 or releaser being displaced via an electric motor 25, e.g. B. via a known swash plate. The motor 25 is arranged outside of the housing section 6 .

The actuating device 11 has a single-piston releaser. The actuating device 11 is actuated electrically.

The actuating device 11 is partly integrated in the housing section 6 and partly arranged outside of the housing section 6 . When the actuating device 11 is actuated, pressure is applied to a piston 30 (by electromechanical displacement) and is displaced along the axial direction 4 , so that a contact pressure force of the actuating device 11 acts on the first element 7 . The brake disk 8 or the carrier element 12 is pressed against the second element 9 by the first element 7 and the brake disk 8 is thus clamped between them. The actuation or pressing force is supported via the one piston 30 and the associated cylinder 31 and ultimately via the housing section 6 .

For this purpose, the cylinder 31 of the actuating device 11 is screwed into the wall of the housing section 6 or arranged fastened therein.

The actuating device 11 comprises a cylinder 31, a piston 30 movable therein and a seal 32 between the piston 30 and the cylinder 31. The restoring force on the piston 30, i.e. for the displacement of the piston 30 away from the first element 7, comes from the seal 32 itself out.

The second element 9 is supported on the housing section 6 in relation to the axial direction 4 . The second element 9 is supported on the housing section 6 via a cam ring 29 of the housing section 6 running in the circumferential direction 14 . The cam ring 29 is crowned on the contact surface with the second element 9, so that a tilting movement of the second element 9 is possible to compensate for deformation and/or potting effects.

Reference List

1

braking device

2

hub drive assembly

3

drive shaft

4

axial direction

5

axis of rotation

6

housing section

7

first item

8th

brake disc

9

second item

10

topping

11

actuating device

12

carrier element

13

hub part

14

circumferential direction

15

connection

16

channel

17

pressure pot

18

leaf spring

19

inner diameter

20

outer diameter

21

drive

22

wheel

23

motor vehicle

24

Housing

25

engine

26

radial direction

27

spline

28

fastener

29

cam ring

30

Pistons

31

cylinder

32

poetry

33

first ramp

34

second ramp

35

area

36

contact surface

37

circle segment

38

gap

Claims (10)

Braking device (1) for a wheel hub drive arrangement (2), the wheel hub drive arrangement (2) having at least one drive shaft (3) with an axis of rotation (5) extending along an axial direction (4); wherein the braking device (1) comprises at least one housing section (6) for arranging the braking device (1) on the wheel hub drive assembly (2) and in the housing section (6) for arranging on the drive shaft (3) coaxially to the axis of rotation (5) and at least one first element (7), one brake disc (8) and one second element (9) arranged next to one another along the axial direction (4); wherein the brake disc (8) has at least one hub part (13) that can be positively connected to the drive shaft (3) relative to a circumferential direction (14), a carrier element (12) that is non-rotatably connected to the hub part (13), and on the carrier element (12) one dem first element (7) and the second element (9) facing covering (10) for contacting the elements (7, 9); the braking device (1) having an actuating device (11) for displacing the first element (7) along the axial direction (4) towards the second element (9); the carrier element (12) being elastically deformable in the axial direction (4) at least in a region (35) between the linings (10) and the hub part (13). Braking device (1) after claim 1 , wherein the carrier element (12) is connected to the hub part (13) via at least one connection (15). Braking device (1) after claim 2 , wherein the coverings (10) are spaced from the at least one connection (15) in a radial direction (26). det are arranged, wherein the region (35) extends circumferentially along the circumferential direction (14) and in the radial direction (26) at least between the at least one connection (15) and the coverings (10). Braking device (1) according to one of the preceding claims, wherein the carrier element (12) is designed at least partially in the shape of a segment of a circle; the individual circle segments (37) being spaced apart from one another along the circumferential direction (14) by a gap (38) running at least in a radial direction (26). Braking device (1) according to one of the preceding claims, in which the second element (9) is supported on the housing section (6) in relation to the axial direction (4). Braking device (1) after claim 5 , wherein the second element (9) is supported on the housing section via a cam ring (29). Braking device (1) after claim 6 , wherein the cam ring (29) has a contact surface (36) for contacting the second element (9), wherein the cam ring (29) has a first ramp (33) which cooperates with a second ramp (34) on the housing section (6). , so that when the cam ring (29) is rotated relative to the housing section (6), the contact surface (36) can be displaced along the axial direction (4). Braking device (1) according to one of the preceding claims, wherein at least one element (7, 9) is connected to the housing section (6) via at least one leaf spring (18). Braking device (1) according to one of the preceding claims, wherein a mass of at least one element (7, 9) is greater by a factor of at least 1.5 than a mass of the carrier element (12). Wheel hub drive arrangement (2), at least comprising an electric drive (21) and a drive shaft (3) which can be driven by it, with an axis of rotation (5) extending in an axial direction (4) for connection to a wheel (22) of a motor vehicle (23), wherein the electric drive (21) and at least partially the drive shaft (3) are arranged in a housing (24); wherein the wheel hub drive arrangement (2) has a braking device (1) according to one of the preceding claims for braking the drive shaft (3) as required.

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