Parking brake for a vehicle

Abstract

The invention relates to a parking brake (10) for a vehicle, having an input side (20) mounted to rotate about an axis of rotation (15), a brake pack (25), a first disc carrier (30), a second disc carrier (35), a brake housing (40), a pressure pot (45), an actuation device (50) and a locking device (55), wherein the first disc carrier (30) is connected to the brake housing (40) for conjoint rotation and the second disc carrier (35) is mounted to rotate about the axis of rotation (15) and is torque-transmittingly connected to the input side (20), wherein the pressure pot (45) is arranged at least in some regions axially between the actuation device (50) and the brake pack (25), wherein the pressure pot (45) can be moved axially along the axis of rotation between a relief position and an actuation position, which is offset with respect to the relief position towards the brake pack, wherein the actuation device (50) is designed to provide an actuation force (F) in a switchable manner, wherein the pressure pot (45) is designed to introduce the actuation force (F) into the brake pack (25) to form a frictional connection between a first brake disc (70) and a second brake disc (75) of the brake pack (25), wherein in the relief position of the pressure pot (45) the second brake disc (75) can be rotated with respect to the first brake disc (70).

Description

[0001] Parking brake for a vehicle

[0002] The invention relates to a parking brake for a vehicle according to claim 1.

[0003] DE 10 2019 111 424 A1 discloses a parking brake system for an electrically or hybrid-powered motor vehicle. It comprises a differential device for compensating for different speeds of two wheels of a vehicle on an axle, and a braking device for braking the motor vehicle when stationary. The braking device is designed to act on the differential device to release it or to lock it by friction.

[0004] The object of the invention is to provide an improved parking brake.

[0005] This object is achieved by means of a parking brake according to claim 1. Advantageous embodiments are specified in the dependent claims.

[0006] It has been recognized that an improved parking brake for a vehicle can be provided in that the parking brake has an input side mounted for rotation about an axis of rotation, a brake assembly, a first plate carrier, a second plate carrier, a brake housing, a pressure chamber, an actuating device, and a locking device. The first plate carrier is connected to the brake housing in a rotationally fixed manner. The second plate carrier is mounted for rotation about the axis of rotation and is connected to the input side in a torque-locking manner. The brake assembly has at least one first brake plate and at least one second brake plate arranged axially next to the first brake plate. The pressure chamber is arranged at least partially axially between the actuating device and the brake assembly.The pressure pot is axially movable along the rotational axis between a relief position and an actuation position, which is offset relative to the brake assembly from the relief position. The actuation device is designed to switchably provide an actuation force that moves the pressure pot into the actuation position. Furthermore, the pressure pot is designed to introduce the actuation force into the brake assembly to form a frictional connection between the first brake plate and the second brake plate. In the relief position, the second brake plate is rotatable relative to the first brake plate. The locking device is designed to secure the pressure pot in the actuation position.

[0007] This design has the advantage that, in the actuating position, the actuating device no longer needs to provide the actuating force required to generate the frictional engagement within the brake assembly. In particular, the actuating device can be deactivated and depressurized, for example, while the locking device still ensures that the frictional engagement in the brake assembly is maintained. This is particularly advantageous for reliably preventing the vehicle from rolling away using the parking brake during a parking maneuver.

[0008] In a further embodiment, the locking device comprises at least one electromagnet, a support disk, and a first anti-rotation device. The electromagnet has at least one core with at least one guide and a coil arrangement that can be supplied with an electric current. The core is connected to the first anti-rotation device and is mounted so as to be axially displaceable along the axis of rotation between a first axial position and a second axial position that is different from the first axial position. The first anti-rotation device is designed to prevent rotation of the core about the axis of rotation. The support disk has a first engagement element that engages the guide. The support disk is rotatable about the axis of rotation between a first rotational position and a second rotational position that is different from the first rotational position, and is mounted so as to be axially fixed with respect to the axis of rotation.In the first axial position, the support disc is arranged in the first rotational position. The core is designed to move axially between the first axial position and the second axial position when the coil arrangement is energized with a minimum electrical current, and to rotate the support disc between the first rotational position and the second rotational position when the first engagement element engages the guide. This design has the advantage that the parking brake can be locked electromechanically, and to hold the parking brake in the locked position, energizing the electromagnet is no longer necessary. This allows the vehicle to remain in the parked position for a long time, and safe parking is possible both with the depressurized actuating device and the de-energized electromagnet.

[0009] In a further embodiment, the pressure pot is mechanically coupled to the support disc, wherein in the first rotational position, the pressure pot is axially movable between the actuating position and the unloading position. In the second rotational position, the support disc is designed to secure the pressure pot in the actuating position. This can be achieved, in particular, by the pressure pot resting against the support disc in the second rotational position and being supported by the support disc in order to continue to act on the brake assembly by means of the actuating force.

[0010] In a further embodiment, the guide is oriented obliquely to the rotational axis and is open at least on one circumferential side of the core, in particular on an outer circumferential side. The first engagement element extends in the radial direction, in particular from radially outside to radially inside, and engages the guide. This configuration has the advantage that the locking device requires particularly little installation space and, in particular, the core is used not only for electromagnetic coupling with the coil arrangement, but also for mechanical actuation of the support disc.

[0011] In a further embodiment, the actuating device has a pressure piston and a pressure chamber, wherein the pressure piston at least partially delimits the pressure chamber. The pressure chamber can be filled with a pressurized fluid, for example compressed air or a hydraulic fluid, to provide the actuating force. The pressure piston rests against the pressure pot on a side facing the brake assembly and against the support disc on a side facing away from the brake assembly. In the second axial position, the support disc secures the pressure pot in the actuating position via the pressure piston. This design has the advantage that the number of components of the parking brake can be kept to a minimum and, secondly, the actuating device can be designed conventionally hydraulically or pneumatically. Of course, it is also possible for the actuating device to be switchable electromagnetically, for example.

[0012] In a further embodiment, the support disk has at least one first coupling receptacle with a first contact surface. The support disk can preferably have a second coupling receptacle arranged offset in the circumferential direction to the first coupling receptacle and having a second contact surface arranged axially offset to the first contact surface. The pressure piston has a second engagement element extending in the axial direction. In the first rotational position, the second engagement element engages in the first coupling receptacle and rests on the first contact surface at the end. Preferably, in the second rotational position, the second engagement element engages in the second coupling receptacle and rests on the second contact surface at the end. This configuration has the advantage that unwanted rotation of the support disk is prevented by the engagement of the second engagement element in the first coupling receptacle, at least in the first rotational position.As a result, incorrect operation, for example due to a control error for switching the electromagnet, cannot lead to the parking brake being unintentionally actuated via the electromagnet or at least partially being put into a slipping state.

[0013] In a further embodiment, the second engagement element has a second circumferential side. The first coupling receptacle has a first inner side. The second circumferential side is preferably designed to correspond to the first inner side. When the second engagement element engages in the first coupling receptacle, rotation of the support disk relative to the core is blocked by the second circumferential side abutting against the first inner side. This secures the core against rotation, and the anti-rotation device, which acts on the pressure piston, secures the support disk via the pressure piston. This allows the number of components to be kept low and the required installation space is also kept to a minimum. In a further embodiment, the actuating device has a second anti-rotation device, wherein the second anti-rotation device is connected to the brake housing and is designed to block rotation of the pressure piston relative to the brake housing.In particular, in conjunction with the engagement of the second engagement element in the first coupling receptacle, this ensures that at least in the first rotational position, both the support disc and the pressure piston cannot be rotated in the circumferential direction.

[0014] In a further embodiment, the locking device has a return element, wherein the return element is coupled to the brake housing on a first side and to the core on a second side arranged opposite the first side. The return element preferably has at least one spring. The return element is designed to move the core from the second axial position into the first axial position, wherein the return element is preferably arranged radially opposite the coil arrangement of the electromagnet. This embodiment has the advantage that active energization of the coil arrangement for returning the core from the second axial position to the first axial position can be dispensed with and the control unit for controlling the parking brake can therefore be designed particularly simply.

[0015] In a further embodiment, the parking brake has a first bearing arrangement, wherein the first bearing arrangement is arranged between the brake housing and the support disc. The first bearing arrangement is designed to support the support disc rotatably about the rotational axis on the brake housing and to support a supporting force acting in the axial direction to provide the actuating force on the brake housing. This configuration has the advantage that the actuating force can be maintained essentially completely while the pressure piston or the actuating device is depressurized. As a result, the parking brake has a high braking effect.

[0016] The invention is explained in more detail below with reference to the accompanying figures. Figure 1 shows a semi-longitudinal section through a parking brake;

[0017] Figure 2 shows a section A of the parking brake shown in Figure 1, marked in Figure 1;

[0018] Figure 3 is a perspective view of the support disc shown in Figure 2;

[0019] Figure 4 is a semi-longitudinal section through the support disc shown in Figure 3;

[0020] Figure 5 is a perspective view of the device shown in Figures 1 and 2

[0021] core;

[0022] Figure 6 is a semi-longitudinal section through the core shown in Figure 5;

[0023] Figure 7A is a perspective half-longitudinal section through an arrangement of the core and the support disc;

[0024] Figure 7B is a plan view of the arrangement of the core and the support disc;

[0025] Figure 8 shows section A marked in Figure 1;

[0026] Figure 9 is a sectional view through the support disc and the core;

[0027] Figure 10 shows the parking brake shown in Figure 1 in the actuated and locked state; and

[0028] Figure 11 shows a section B marked in Figure 10 of the semi-longitudinal section through the parking brake shown in Figure 10.

[0029] Figure 1 shows a semi-longitudinal section through a parking brake 10. The parking brake 10 can also be referred to as a parking brake and is designed to prevent the vehicle from rolling away when stationary. The vehicle is preferably designed as an electric vehicle.

[0030] The parking brake 10 has an input side 20 rotatably mounted about a rotation axis 15, a brake assembly 25, a first disk carrier 30, a second disk carrier 35, a brake housing 40, a pressure pot 45, an actuating device 50, a locking device 55, a first bearing arrangement 60 and a second bearing arrangement 65.

[0031] The brake housing 40 encloses a housing interior 95, wherein the brake assembly 25, the second disk carrier 35, the pressure pot 45, the actuating device 50 and the first and second bearing arrangements 60, 65 are arranged in the housing interior 95.

[0032] Furthermore, the brake housing 40 can be mechanically connected in a rotationally fixed manner outside the housing interior 95, for example, to a drive housing 100, for example, an electric motor or an electric axle. The housing interior 95 can be sealed from the environment 105. This prevents dirt particles from penetrating the housing interior 95.

[0033] The first disc carrier 30 and the second disc carrier 35 are arranged offset from one another in the radial direction relative to the rotation axis 15 and form, for example, an annular gap. The brake assembly 25 is arranged in the annular gap. In this embodiment, the first disc carrier 30 can be designed, for example, as an inner disc carrier and the second disc carrier 35 as an outer disc carrier. The brake assembly 25 is arranged radially inward of the first disc carrier 30 and radially outward of the second disc carrier 35.

[0034] The first disk carrier 30 can be connected to the brake housing 40 in a rotationally fixed manner. In particular, the first disk carrier 30 and the brake housing 40 can be formed integrally and from the same material. The second disk carrier 35 can, for example, be connected radially inwardly to the input side 20.

[0035] The brake assembly 25 is arranged radially in the annular gap and has at least one first brake plate 70 and at least one second brake plate 75. The brake assembly 25 preferably has a plurality of first and second brake plates 70, 75 arranged axially next to one another in a stack, alternating. The first brake plate 70 can be designed, for example, as a padless plate, in particular as a steel plate. The second brake plate 75 is designed, for example, as a pad plate. In this case, the second brake plate 75 has, for example, a brake pad on each side. In addition, the brake assembly 25 can have one or more wave springs 80. The wave spring 80 can be arranged, for example, on the first and / or second brake plate 70, 75.

[0036] The first brake plate 70 is axially displaceable and rotationally fixed to the first plate carrier 30. The second brake plate 75 is axially displaceable and rotationally fixed to the second plate carrier 35.

[0037] The input side 20 has, for example, an output hub 85. The output hub 85 can, for example, be connected in a rotationally fixed manner to a side shaft 90. The input side 20 is mounted on the brake housing 40 by means of the second bearing assembly 65 for rotation about the rotation axis 15. The second bearing assembly 65 can, for example, comprise a rolling bearing. The second bearing assembly 65 is preferably arranged radially outwardly on the input side 20.

[0038] The actuating device 50 has a pressure chamber 110 and a pressure piston 115. The pressure chamber 110 is delimited by the pressure piston 115 and the brake housing 40. The pressure chamber 110 can be filled with a pressurized fluid, in particular a liquid. On the side facing the brake assembly 25, the pressure piston 115 rests against a pressure pot 45 arranged between the brake assembly 25 and the pressure piston 115. The pressure pot 45 is, for example, stepped in this case, so that the pressure piston 115 and the brake assembly 25, for example, have at least partial axial overlap. An axial overlap is understood to mean that when two components are projected in the radial direction into a projection plane in which, for example, the axis of rotation 15 runs, the two components, for example the brake assembly 25 and the pressure piston 115, at least partially overlap in the projection plane.

[0039] A support element 120 is provided axially opposite the pressure pot 45. The support element 120 is axially fixedly connected to the first disk carrier 30 and thus also to the brake housing 40. The brake assembly 25 is arranged axially between the pressure pot 45 and the support element 120.

[0040] Figure 1 shows the parking brake 10 in an unactuated, unloaded state. The wave springs 80, which are preferably arranged on each of the brake plates 70, 75, push the brake plates 70, 75 apart, so that the brake plates 70, 75 preferably do not touch one another or only touch one another slightly at the end faces. This allows the input side 20 to be rotated relative to the brake housing 40. The pressure piston 115 is retracted, and the pressure pot 45 is in a relief position, in which it has moved toward the pressure chamber 110.

[0041] To activate the parking brake 10 and prevent the input side 20 from rotating relative to the brake housing 40, the actuating device 50 is designed to actuate the brake assembly 25. In the actuated state, for example, the pressurized fluid in the pressure chamber 110 is pressurized. The pressurized fluid acts on the pressure piston 115 with an actuating force F. The actuating force F is introduced from the pressure piston 115 via the pressure pot 45 into the brake assembly 25. The actuating force F acts in the axial direction. Upon actuation, the pressure piston 115 moves axially out of the pressure chamber 110 and actuates the pressure pot 45.

[0042] The pressure pot 45 is moved from the relief position to an actuation position that is offset from the relief position. The support element 120 provides a counterforce FG1, wherein the counterforce FG1 acts oppositely to the actuation force F. By means of the counterforce FG1 and the actuation force F, the brake plates 70, 75 are pressed together, so that a frictional engagement is formed in the brake assembly 25. Via the frictional engagement, the first plate carrier 30 is torque-locked to the second plate carrier 35 in the actuated state of the parking brake 10. As a result, in the actuated state, the input side 20 is torque-locked, preferably rotationally fixed, to the brake housing 40.

[0043] In the actuated state, the brake plates 70, 75 are pressed directly against one another and thus an axial extension of the brake package 25 is reduced compared to the state shown in Figure 1.

[0044] Figure 2 shows a section A marked in Figure 1 of the parking brake 10 shown in Figure 1.

[0045] The locking device 55 is arranged, for example, radially inward of the actuating device 50. In this embodiment, the pressure piston 115 is formed, for example, in two parts and has a coupling disc 116 and a piston 117 that defines the pressure chamber 110. The piston 117 rests against the coupling disc 116 on a side facing away from the pressure chamber 110. The piston 117 can be connected to the coupling disc 116.

[0046] The locking device 55 comprises, for example, an electromagnet 125, a support disc 130 and at least one first anti-rotation device 135 and a return element 140.

[0047] The brake housing 40 has a first housing web 160 extending in the axial direction. The first housing web 160 extends in the direction of the brake assembly 25 and faces the brake assembly 25. Radially outwardly of the first housing web 160, the brake housing 40 can have a second housing web 164. The first housing web 160 and the second housing web 164 define a second radial gap, wherein the electromagnet 125 and the return element 140 are arranged in the second radial gap.

[0048] The electromagnet 125 has at least one coil assembly 145 and a core 150. The core 150 is made of a ferritic material. The core 150 is annular and extends substantially hollow-body-like around the rotational axis 15. In the embodiment, the core 150 preferably has a web 155, wherein the web 155 extends radially inward.

[0049] The return element 140 is arranged radially inward of the core 150. The return element 140 can comprise a spring. The return element 140 is connected to the first housing web 160 on a first side. Axially opposite, at another end of the return element 140, the return element 140 is coupled to the core 150.

[0050] The coil arrangement 145 has at least one electrical coil that can be energized with a coil current to provide an electromagnetic field that acts on the core 150.

[0051] If the coil current exceeds a minimum coil current, the core 150 can be moved between a first axial position shown in Figure 2 and a second axial position offset in the axial direction relative to the rotation axis 15 (cf.

[0052] Fig. 10). In the embodiment, the core 150 is arranged, for example, radially inward of the coil assembly 145. The coil assembly 145 is connected to the brake housing 40 and is stationary.

[0053] The core 150 is fixedly arranged in the circumferential direction via the first anti-rotation device 135. For example, the first anti-rotation device 135 couples the core 150 to the brake housing 40 in the circumferential direction, while the core 150 is displaceable in the axial direction between the first axial position and the second axial position. Upon displacement of the core 150 from the first axial position, which is shown in Figure 2, toward the second axial position, the return element 140 is tensioned, whereby the return element 140 serves to return the core 150 back to the first axial position.

[0054] To form the first anti-rotation device 135, a first anti-rotation receptacle 165 can be arranged, for example, in the core 150. A first anti-rotation pin 170 of the first anti-rotation device 135 engages in the brake housing 40 and is axially fixedly connected to the brake housing 40. The first anti-rotation pin 170 can be aligned parallel to the rotation axis 15. At the other end, facing away from the brake housing 40, the first anti-rotation pin 170 engages in the first anti-rotation receptacle 165 in the core 150.

[0055] The first bearing arrangement 60 can have a radial bearing 245 and an axial bearing 250. The radial bearing 245 supports the support disc 130 for rotation about the rotation axis 15. The axial bearing 250 is arranged axially between the brake housing 40 and the support disc 130 and supports the support disc 130 in the axial direction. The support disc 130 can be supported on the brake housing 40 via the axial bearing 250.

[0056] Figure 3 shows a perspective view of the support disc 130 shown in Figure 2.

[0057] The support disk 130 is essentially annular in shape and extends around the axis of rotation 15. The support disk 130 has an annular portion 175. The support disk 130 can be stepped on a first end face 180 of the annular portion 175. At least one first engagement element 185 adjoins the annular portion 175 radially on the inside. The first engagement element 185 extends radially inward from the annular portion 175. The first engagement element 185 preferably extends in a rotational plane perpendicular to the axis of rotation 15. The first engagement element 185 can be bar-shaped. Preferably, in Figure 3, a plurality of first engagement elements 185 are arranged on the annular portion 175, offset from one another in the circumferential direction.

[0058] On the first end face 180, the support disk 130 has at least one first coupling receptacle 190 and a second coupling receptacle 195 arranged circumferentially offset from the first coupling receptacle 190. In this case, the second coupling receptacle 195 is arranged adjacent to the first coupling receptacle 190. The first coupling receptacle 190 and the second coupling receptacle 195 form a coupling receptacle pair 200.

[0059] The first coupling receptacle 190 and the second coupling receptacle 195 are each arranged on a common circular path around the rotation axis 15. In the embodiment, for example, the first coupling receptacle 190 and the second coupling receptacle 195 are each formed as a bore in the first end face 180. In particular, the first and second coupling receptacles 190, 195 are each formed as a blind hole.

[0060] Figure 4 shows a semi-longitudinal section through the support disc 130 shown in Figure 3.

[0061] The first coupling receptacle 190 has a first contact surface 205 at its base. The first contact surface 205 preferably extends in a rotational plane perpendicular to the rotational axis 15. Furthermore, the first coupling receptacle 190 has a first inner side 210. The first inner side 210 can, for example, be formed as a bore with a circular cross-section.

[0062] The second coupling receptacle 195 further has a second contact surface 215 at its base and a second inner side 220 on its circumference. The second inner side 220 can preferably have an identical profile to the first inner side 210. The second contact surface 215 is arranged offset in the axial direction from the first contact surface 205. In the embodiment, the support disk 130 can have a plurality of coupling receptacle pairs 200 of first and second coupling receptacles 190, 195 arranged offset from one another in the circumferential direction.

[0063] On a side axially opposite the first end face 180, the support disk 130 has a second end face 181, on which the support disk 130 rests against the axial bearing point 250.

[0064] Figure 5 shows a perspective view of the core 150 shown in Figures 1 and 2.

[0065] On the side facing away from the brake housing 40, the core 150 has a third end face 225, which can extend, for example, in a rotational plane perpendicular to the rotational axis 15. Starting from the third end face 225, the core 150 has a guide 230, wherein the guide 230 is groove-shaped. Furthermore, the guide 230 runs obliquely inclined to the rotational axis 15. The guide 230 has at least one guide surface 235. The guide 230 is open in the radial direction, for example, at least on one outer circumferential side. On the side facing away from the third end face 225, the guide 230 is closed and does not extend to a fourth end face 240 of the core 150, which is arranged opposite the third end face 225.

[0066] Preferably, the core 150 has a plurality of guides 230 arranged offset from one another in the circumferential direction, wherein the number of guides 230 preferably corresponds to a number of first engagement elements 185. The guide 235 is configured in the circumferential direction to correspond to the first engagement element 185.

[0067] Figure 6 shows a semi-longitudinal section through the Kem 150 shown in Figure 5.

[0068] Due to the oblique arrangement of the guide 230 in the core 150, the guide surface 235 has a slope. The first anti-rotation retainer 165 is arranged, for example, offset in the circumferential direction from the guide 230. Furthermore, the web 155, against which the return element 140 rests when the parking brake 10 is mounted, is clearly visible in Figures 5 and 6.

[0069] Figure 7A shows a perspective semi-longitudinal section through an arrangement of the core 150 and the support disc 130 and Figure 7B shows a plan view of the arrangement of the core 150 and the support disc 130.

[0070] The core 150 is located in the first axial position in Figure 7. In both the first axial position and the second axial position, the first engagement element 185 engages the guide 230.

[0071] In the first axial position, the electromagnet 125 and in particular the coil arrangement 145 are de-energized, for example. The return element 140 presses the core 150 into the first axial position and secures the core 150 in the first axial position, thus preventing an unwanted axial displacement of the core 150, for example, toward the second axial position. Furthermore, the first anti-rotation device 135 ensures that the core 150 has a defined orientation relative to the brake housing 40 in the first axial position, so that the orientation of the core 150 is defined in the first axial position.

[0072] Figure 8 shows section A marked in Figure 1.

[0073] The actuating device 50 has a second anti-rotation device 255. The second anti-rotation device 255 has a second anti-rotation pin 260 and a second anti-rotation receptacle 265, which is arranged on the end face in a third housing web 270 of the brake housing 40. The third housing web 270 preferably extends substantially parallel to the axis of rotation 15 and is arranged on the side of the brake housing 40 facing the brake assembly 25. In the radial direction, the third housing web 270 is arranged at a distance from the second housing web 164. The second anti-rotation pin 260 is axially connected to the pressure piston 115, in particular the coupling disc 116, and engages in the second anti-rotation receptacle 265. The second anti-rotation receptacle 265 and the second anti-rotation pin 260 are preferably designed to correspond to one another.The second anti-rotation device 255 prevents unwanted rotation of the pressure piston 115, in particular of the coupling disc 116, in the circumferential direction around the rotation axis 15. Furthermore, the second anti-rotation device 255 ensures axial mobility of the pressure piston 115 relative to the brake housing 40.

[0074] Radially inward of the second anti-rotation device 255, the pressure piston 115 with the coupling disk 116 projects beyond the third housing web 270 in the direction of the second housing web 164. Radially outward of the third housing web 270, the pressure chamber 110 adjoins the third housing web 270.

[0075] The pressure piston 115 has a second engagement element 275, wherein the second engagement element 275 can be pin-shaped, for example. The second engagement element 275 is arranged radially between the second housing web 164 and the third housing web 270 and extends in the axial direction away from the brake assembly 25 toward the support disk 130. In particular, the second engagement element 275 can be arranged radially inward on the coupling disk 116.

[0076] In the first axial position of the core 150, the support disk 130 is in a first rotational position, wherein in the first rotational position, the second engagement element 275 engages the first coupling receptacle 190. The second engagement element 275 rests on the front side against the first contact surface 205. In the first rotational position, as already explained above, the pressure pot 45 is movable between the relief position and the actuation position.

[0077] The first inner side 210 can be configured relative to the second engagement element 275 in such a way that a radial gap is provided between the first inner side 210 and the second engagement element 275. This allows the second engagement element 275 to easily insert into the first coupling receptacle 190. Unintentional rotation of the support disk 130 can be prevented by the first inner side 210 abutting against the second engagement element 275, which is oriented relative to the brake housing 40 in a circumferential direction defined by the second anti-rotation device 255.

[0078] The wave spring 80 releases the brake assembly 25 and pushes the pressure pot 45 toward the brake housing 40. The pressure pot 45 also acts on the piston 117 via the coupling disc 116 to push it into its initial position. Likewise, secure engagement of the second engagement element 275 in the first coupling receptacle 190 is ensured. Furthermore, the return element 140 secures the core 150 in the first axial position. The frictional engagement in the brake assembly 25 is eliminated, allowing rotation of the second disk carrier 35 relative to the first disk carrier 30.

[0079] When the parking brake 10 is activated, pressurized fluid is introduced into the pressure chamber 110. The pressurized fluid acts with the actuating force F on the pressure piston 115, which acts on the brake assembly 25 via the pressure pot 45 to generate the frictional engagement in the brake assembly 25, as already explained in the context of Figure 2.

[0080] Figure 9 shows a sectional view through the support disk 130 and the core 150.

[0081] The second engagement element 275 is thereby withdrawn from the first coupling receptacle 190, so that the support disc 130 is rotatably mounted relative to the pressure piston 115 about the rotation axis 15 by means of the radial bearing 245. The second engagement element 275 is arranged at a distance from the first end face 180 in the axial direction.

[0082] Figure 10 shows the parking brake 10 shown in Figure 1 in the actuated and locked state. The brake assembly 25 is compressed by the actuating force F and the counterforce FG1, and the frictional engagement in the brake assembly 25 ensures the torque-locking connection of the first and second disc carriers 30, 35. The pressure chamber 45 is in the actuated position.

[0083] To lock the parking brake 10 and to hold the pressure pot 45 in the actuated position without requiring the actuating device 50 to be activated, the coil arrangement 145 is energized by a minimum electrical current. The coil arrangement 145 generates a magnetic field acting on the core 150, and the core 150 is moved by the magnetic field from the first axial position shown in Figure 8 toward a second axial position.

[0084] The guide 230 slides with the guide surface 235 along the first engagement element 185, so that the support disc 130 is rotated in the circumferential direction about the rotation axis 15 from the first rotational position to the second rotational position.

[0085] In the movement between the first axial position and the second axial position, the return element 140 is tensioned with a tension force FS.

[0086] Figure 11 shows a section B marked in Figure 10 of the semi-longitudinal section through the parking brake 10 shown in Figure 10.

[0087] To fully lock the parking brake 10 and to hold the pressure pot 45 in the actuated position, the actuating device 50 is, for example, relaxed so that the pressure fluid in the pressure chamber 110 is relieved. As a result, the pressure piston 115 settles and performs a slight movement away from the brake assembly 25, engaging with the second engagement element 275 in the second coupling receptacle 195. By relieving the pressure fluid in the pressure chamber 110, the pressure fluid can be present in the pressure chamber 110 without pressure. The pressure pot 45 essentially remains in the actuated position because the settlement of the pressure piston 115 is very slight. Due to the flat design of the second coupling receptacle 195, the engagement is only indicated in Figure 11. An unwanted rotation of the support disc 130 about the rotation axis 15 can be blocked by a stop of the second outer circumferential side on the second inner side 220 of the second coupling receptacle 195.

[0088] In order to continue to provide the actuating force F so that the brake package 25 provides the frictional engagement, the support disc 130 is supported on the rear side on the side facing the brake housing 40 via the axial bearing point 250 on the brake housing 40 with a support force FA.

[0089] The locking device 55 thus ensures that the parking brake 10 can remain permanently closed without the coil arrangement 145 being energized and / or the pressure fluid in the pressure chamber 110 being pressurized. The parking brake 10 thus remains closed without any further force being applied, and unintentional release of the locking device 55 is reliably prevented by the engagement of the second engagement element 275 in the second coupling receptacle 195.

[0090] In order to release the parking brake 10, for example to start the vehicle again, the pressure fluid in the pressure chamber 110 is pressurized again when the parking brake 10 is closed.

[0091] Due to the pressure application, the pressure piston 115 is moved minimally in the direction of the brake assembly 25. In doing so, the pressure piston 115 lifts the second engagement element 275 from the second coupling receptacle 195, so that the support disc 130 can again be rotated about the rotation axis 15.

[0092] Subsequently, the pressure fluid in the pressure chamber 110 and the pressure applied to the pressure fluid can be released. The tensioned wave spring 80 releases the brake assembly 25, and the brake plates 70, 75 are forced apart. The wave spring 80 presses on the pressure piston 115 via the pressure pot 45 and conveys the released pressure fluid out of the pressure chamber 110. In this case, the frictional engagement in the brake assembly 25 is released, and the input side 20 can again be rotated relative to the brake housing 40, allowing the vehicle to be moved.

[0093] Because the coupling between the support disk 130 and the pressure piston 115 is now released, the return element 140 acts with a clamping force FS against the core 150 and moves the core 150 from the second axial position to the first axial position. In doing so, the core 150 rotates the support disk 130 from the second rotational position back to the first rotational position. In the first rotational position, the second engagement element 275 re-engages the first coupling receptacle 190.

[0094] It should be noted that in the embodiment, the return element 140 is formed by a spring. Of course, it is also possible to dispense with the return element 140 and instead, for example, actively move the core 150 from the second axial position to the first axial position by applying a reverse current to the coil arrangement 145.

[0095] Furthermore, it is pointed out that in addition to the brake package 25, an adjusting device can be provided which automatically adjusts the pressure pot 45 so that a reliable frictional engagement is ensured even when the parking brake 10 is running at high speed and when the brake plates 70, 75 are worn.

[0096] In addition, the parking brake 10 can generate frictional forces at a contact point between the wear adjuster and the support disc 130, which prevent the support disc 130 from inadvertently rotating back from the second rotational position to the first rotational position.

[0097] Furthermore, it should be noted that the second coupling receptacle 195 can be omitted and, for example, the second engagement element 275 can rest on the end face of the support disk 130 in the second rotational position. By providing the actuating force F for opening the parking brake 10, an unintentional opening of the parking brake 10 is additionally avoided. Furthermore, by pressurizing the pressure fluid in the pressure chamber 110 and providing the actuating force F, it can be ensured that the second engagement element 275 is reliably released from the support disk 130 and that existing clamping forces, for example, at a contact point between the support disk 130 and the second engagement element 275, can be eliminated.

[0098] It should be noted that in the embodiment, the actuating device 50 is provided with hydraulic actuation. Of course, it is also possible for an electromechanical actuation to be provided instead of the hydraulic actuation, or for the pressurized fluid to be gaseous, thus providing a pneumatic actuation of the parking brake 10.

[0099] Furthermore, it is pointed out that instead of the locking mechanism shown in Figures 1 and 2 by means of the second engagement element 275 and the first and second coupling receptacles 190, 195, it is of course also possible for a ramp mechanism to be provided in order to ensure an unintentional release, for example by jamming or by means of a frictional engagement between the second engagement element 275 and the support disk 130.

[0100] List of reference symbols Parking brake Rotation axis Input side Brake package First disc carrier Second disc carrier Brake housing Pressure pot Actuating device Locking device First bearing arrangement Second bearing arrangement First brake disc Second brake disc Wave spring Output hub Side shaft Housing interior Drive housing Environment Pressure chamber Pressure piston Coupling disc Piston Support element Electromagnet Support disc First anti-twist device Reset element Coil arrangement 50 Core 55 Web 60 First housing web 64 Second housing web

[0101] 165 first anti-twist holder

[0102] 170 first anti-twist pin

[0103] 175 ring section

[0104] 180 first front side

[0105] 181 second front side

[0106] 185 first engagement element

[0107] 190 first coupling recording

[0108] 195 second coupling mount 00 coupling mount pair 05 first contact surface 10 first inner side 15 second contact surface 20 second inner side 25 third end face 30 guide 35 guide surface 40 fourth end face 45 radial bearing point 50 axial bearing point

[0109] 255 second anti-twist device

[0110] 260 second anti-twist pin

[0111] 265 second anti-twist holder

[0112] 270 third housing bar

[0113] 275 second engagement element

[0114] F Actuating force

[0115] FG1 Counterforce

[0116] FA supporting force

[0117] FS clamping force

Claims

Patent claims 1 . Parking brake (10) for a vehicle, - comprising an input side (20) rotatably mounted about a rotation axis (15), a brake assembly (25), a first disk carrier (30), a second disk carrier (35), a brake housing (40), a pressure pot (45), an actuating device (50) and a locking device (55), - wherein the first disc carrier (30) is connected to the brake housing (40) in a rotationally fixed manner and the second disc carrier (35) is mounted rotatably about the rotation axis (15) and is connected to the input side (20) in a torque-locking manner, - wherein the brake assembly (25) has at least one first brake plate (70) and at least one second brake plate (75) arranged axially next to the first brake plate (70), - wherein the pressure pot (45) is arranged axially between the actuating device (50) and the brake assembly (25), at least in sections, - wherein the pressure pot (45) is axially movable along the axis of rotation between a relief position and an actuation position, which is arranged offset towards the brake package to the relief position, - wherein the actuating device (50) is designed to switchably provide an actuating force (F) which moves the pressure pot (45) into the actuating position, - wherein the pressure pot (45) is designed to introduce the actuating force (F) into the brake assembly (25) to form a frictional connection between the first brake plate (70) and the second brake plate (75), - wherein in the relief position of the pressure pot (45) the second brake plate (75) is rotatable relative to the first brake plate (70), - wherein the locking device (55) is designed to secure the pressure pot (45) in the actuating position.

2. Parking brake (10) according to claim 1, - wherein the locking device (55) comprises at least one electromagnet (125), a support disc (130) and a first anti-rotation device (135), - wherein the electromagnet (125) has at least one core (150) with at least one guide (230) and a coil arrangement (145) which can be supplied with an electric current, - wherein the core (150) is connected to the first anti-rotation device (135) and is mounted axially displaceably along the rotation axis (15) between a first axial position and a second axial position different from the first axial position, - wherein the first anti-rotation device (135) is designed to prevent rotation of the core (150) about the axis of rotation (15), - wherein the support disc (130) has a first engagement element (185) which engages in the guide (230), - wherein the support disc (130) is rotatable about the rotation axis (15) between a first rotation position and a second rotation position different from the first rotation position and is mounted axially fixed relative to the rotation axis (15), - wherein in the first axial position the support disc (130) is arranged in the first rotational position, - wherein the core (150) is designed to move axially between the first axial position and the second axial position when the coil arrangement (145) is energized with a minimum electrical current and to rotate the support disk (130) between the first rotational position and the second rotational position during the movement due to the engagement of the first engagement element (185) in the guide (230).

3. Parking brake according to claim 2, - wherein the pressure pot (45) is mechanically coupled to the support disc (130), - wherein in the first rotational position the pressure pot (45) is axially movable between the actuating position and the relief position, - wherein in the second rotational position the support disc (130) is designed to secure the pressure pot (45) in the actuating position.

4. Parking brake (10) according to claim 2 or 3, - wherein the guide (230) is aligned obliquely to the axis of rotation (15) and is open at least on one circumferential side of the core (150), - wherein the first engagement element (185) extends in the radial direction, in particular from radially outside to radially inside, and engages in the guide (230).

5. Parking brake (10) according to one of claims 2 to 4, - wherein the actuating device (50) has a pressure piston (115) and a pressure chamber (110), - wherein the pressure piston (115) at least partially delimits the pressure chamber (110), - wherein the pressure chamber (110) can be filled with a pressurized fluid to provide the actuating force (F), - wherein the pressure piston (115) rests against the pressure pot (45) on a side facing the brake assembly (25) and against the support disc (130) on a side facing away from the brake assembly (25), - wherein in the second axial position the support disc (130) secures the pressure pot (45) in the actuating position via the pressure piston (115).

6. Parking brake (10) according to claim 5, - wherein the support disc (130) has at least one first coupling receptacle (190) with a first contact surface (205) and preferably a second coupling receptacle (195) arranged offset in the circumferential direction to the first coupling receptacle (190) with a second contact surface (215) arranged axially offset to the first contact surface (205), - wherein the pressure piston (115) has a second engagement element (275) extending in the axial direction, - wherein the second engagement element (275) engages in the first coupling receptacle (190) in the first rotational position and rests on the front side against the first contact surface (205), - wherein preferably the second engagement element (275) engages in the second coupling receptacle (195) in the second rotational position and rests on the end face against the second contact surface (215).

7. Parking brake (10) according to claim 6, - wherein the first coupling receptacle (190) has a first inner side (210), - wherein, upon engagement of the second engagement element (275) in the first coupling receptacle (190), rotation of the support disc (130) relative to the core (150) is blocked by a stop of the second engagement element (275) on the first inner side (210).

8. Parking brake (10) according to one of claims 5 to 7, - wherein the actuating device (50) has a second anti-rotation device (255), - wherein the second anti-rotation device (255) is connected to the brake housing (40) and is designed to block rotation of the pressure piston (115) relative to the brake housing (40).

9. Parking brake (10) according to one of claims 2 to 8, - wherein the locking device (55) has a return element (140), - wherein the return element (140) is coupled to the brake housing (40) on a first side and to the core (150) on a second side arranged opposite the first side, - wherein the return element (140) preferably comprises at least one spring, - wherein the return element (140) is designed to move the core (150) from the second axial position to the first axial position, - wherein the return element (140) is preferably arranged radially opposite the coil arrangement (145) of the electromagnet (125).

10. Parking brake (10) according to one of the preceding claims, - comprising a first bearing arrangement (60), - wherein the first bearing arrangement (60) is arranged between the brake housing (40) and the support disc (130), - wherein the first bearing arrangement (60) is designed to support the support disc (130) rotatably about the axis of rotation (15) on the brake housing (40) and to support a supporting force (FA) acting in the axial direction for providing the actuating force (F) on the brake housing (40).

Images