BRAKE UNIT FOR A VEHICLE, BRAKE DEVICE COMPRISING THE BRAKE UNIT AND VEHICLE COMPRISING THE BRAKE UNIT AND/OR THE BRAKE DEVICE

Abstract

A brake unit for a vehicle is disclosed, including a housing, a hydraulic unit, a braking element unit, wherein the braking element unit forms or supports a braking partner in a braking device for the vehicle. The housing, the hydraulic unit and/or the braking element unit define a main axis, wherein the hydraulic unit moves the braking element unit in an axial direction relative to the housing, in order to generate a braking force, and having a guide unit. The guide unit guides the braking element unit in the radial direction during the axial movement, wherein the guide unit has a master guide and an auxiliary guide, wherein the master guide and the auxiliary guide are arranged eccentrically.

Claims

1. A brake unit for a vehicle, comprising: a housing, a hydraulic unit, a braking element unit, wherein the braking element unit forms or supports a braking partner in a braking device for the vehicle, wherein the housing, the hydraulic unit or the braking element unit define a main axis, wherein the hydraulic unit moves the braking element unit in an axial direction relative to the housing, in order to generate a braking force, a guide unit, wherein the guide unit guides the braking element unit in a radial direction during an axial movement, wherein the guide unit has a master guide and an auxiliary guide, wherein the master guide and the auxiliary guide are arranged eccentrically.

2. The brake unit according to claim 1, wherein the braking element unit has a braking surface, wherein the braking surface is formed circumferentially to the main axis or wherein the hydraulic unit has an annular space and an annular piston, wherein the annular space and the annular piston are formed circumferentially to the main axis.

3. The brake unit according to claim 1, wherein the master guide has a first radial clearance and the auxiliary guide has a second radial clearance, wherein the first radial clearance is smaller than the second radial clearance.

4. The brake unit according to claim 1, wherein the master guide has a first axle section, wherein the first axle section is arranged on the braking element unit, and a first guide section, wherein the first guide section is arranged on the housing, wherein the first axle section is coaxially arranged in the first guide section, or wherein the auxiliary guide has a second axle section, wherein the second axle section is arranged on the braking element unit, and a second guide section, wherein the second guide section is arranged on the housing, wherein the second axle section is coaxially arranged in the second guide section.

5. The brake unit according to claim 4, wherein the master guide has a first guide sleeve, wherein the first guide sleeve is placed on the first axle section, or the auxiliary guide has a second guide sleeve, and wherein the second guide sleeve is placed on the second axle section.

6. The brake unit according to claim 4, wherein the housing has a housing base body, wherein the first and second guide sections are integrally formed by the housing base body, or the braking element unit has a brake base body, wherein the first and second axle sections are integrally formed by the brake base body.

7. The brake unit according to claim 4, wherein the braking element unit has a force distribution plate, wherein the force distribution plate is operatively connected to the hydraulic unit, and wherein the force distribution plate is connected via the first, second and third axle sections to direct braking force from the hydraulic unit into the braking element unit.

8. The brake unit according to claim 7, wherein a return unit for returning the braking element unit in an axial opposite direction, wherein the return unit has a first return spring, a second return spring and a third return spring, wherein the first return spring is arranged coaxially with the master guide or the first axle section, the second return spring is arranged coaxially with the auxiliary guide or the second axle section, and the third return spring is arranged coaxially with the third axle section.

9. A braking device, wherein a braking element unit according to claim 1, wherein the braking element unit has a brake disc, wherein the brake disc is made of metal, or wherein the braking device has a brake pad, wherein the brake pad is connectable to a wheel of the vehicle in a non-rotatable manner.

10. A vehicle having the brake unit according to claim 1, wherein the vehicle is designed as an electric motorcycle or as an electric scooter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further features, advantages and effects of the disclosure are set out in the following description of the preferred embodiments of the disclosure. In the figures:

[0027] FIG. 1 shows a three-dimensional representation of a vehicle with a brake unit as an embodiment of the disclosure;

[0028] FIG. 2 shows a schematic sectional view of the brake unit of FIG. 1 as a further embodiment of the disclosure.

[0029] FIG. 3 shows a three-dimensional, schematic axial representation of the brake unit from FIG. 1.

DETAILED DESCRIPTION

[0030] Parts that correspond to each other or are identical are marked with the same reference marks in the illustrations.

[0031] FIG. 1 shows a three-dimensional representation of a vehicle 1, wherein the vehicle 1 is designed as an electric motorcycle, electric pedal scooter or electric scooter, also known as an e-scooter. For this purpose, the vehicle 1 has a wheel module 2 with a wheel 3, which forms a front wheel of the vehicle 1. The wheel module 2 is used in particular to electrically drive the vehicle 1. In addition, the vehicle 1 has a rear wheel 4, in particular a non-powered rear wheel, which is rotatably mounted on a vehicle frame 5 of the vehicle 1.

[0032] The vehicle 1 has a wheel fork 6, wherein the wheel module 2 is rotatably mounted in the wheel fork 6. The wheel fork 6 is pivotally connected to the frame 5 via handlebars 7, so that the wheel module 2 can be pivoted via the handlebars 7 to steer the vehicle 1.

[0033] The wheel 3 of the wheel module 2 has a wheel rim 8 and a tire 9, the tire 9 being arranged on the wheel rim 8. For example, the wheel rim 8 is designed as a steel, aluminum or plastic rim. For example, the tire 9 is designed as a rubber tire filled with air.

[0034] The wheel module 3 has a wheel axle 10 which defines a main axis H with its longitudinal axis. The wheel 3 is arranged with its axis of rotation coaxially to the wheel axle 10. The wheel axle 10 is fixed to the wheel fork 6, wherein the wheel rim 8 is rotatably mounted on the wheel axle 10 via two bearing devices, e.g., rolling bearings.

[0035] To drive the wheel 3, the wheel module 2 has a drive device 11, for example an electric motor, integrated into the wheel rim 8. The drive device 11 has a stator which is connected to the wheel axle 10 in a non-rotatable manner and is arranged between the two bearing devices in the axial direction with respect to the main axis H. In addition, the drive device 12 has a rotor that is connected to the wheel rim 8 in a non-rotatable manner. In driving operation of the vehicle 1, the wheel rim 8 is driven by the drive device 11, with the wheel 3 rotating about the main axis H.

[0036] The wheel module 2 has a braking device 12, which is used to transmit a braking torque to the wheel 3. The braking device 12 is designed as a friction brake and is arranged on one side of the wheel rim 8 and/or is operatively connected to the wheel rim 8.

[0037] The braking device 12 has an annular brake pad, in particular extending around the main axis H, as one braking partner and a brake disc 13 (FIG. 2) as a further braking partner, wherein the brake pad and the brake disc 13 are arranged coaxially to one another with respect to the main axis H. The brake pad is non-rotatable with respect to the main axis H on an axial end face of the wheel rim 8, so that the brake pad is carried along by the wheel rim 8 during driving operation and rotates about the main axis H. The brake disc 13 is movable in an axial direction AR towards the brake pad and in an axial opposite direction GR away from the brake pad. In the direction of rotation about the main axis H, the brake disc 13 is coupled to the wheel axis 10 or the wheel fork 6 in a non-rotatable manner.

[0038] In an actuated state of the braking device 12, the brake disc 13 contacts the brake pad so that a frictional connection is formed to brake the rotating wheel 3 by friction between the brake disc 13 and the brake pad.

[0039] FIG. 2 shows a schematic longitudinal section through a brake unit 14, wherein the brake unit 14 forms the fork-fixed part of the braking device 12, in particular the brake unit 14 carries the brake disc 13 and displaces it in axial direction AR and opposite direction GR.

[0040] The brake unit 14 has a housing 15, wherein the housing 15 is arranged coaxially to the main axis H and is arranged on the wheel fork 6 in a non-rotatable manner. The brake unit 14 has a hydraulic unit 16, wherein the hydraulic unit 16 is arranged, in particular integrated, in the housing 15.

[0041] The hydraulic unit 16 has a connection 17 through which hydraulic pressure can be applied to it. The connection 17 is fluidically connected to an annular space 18 as a pressure chamber, wherein the annular space 18 forms a cylinder of the hydraulic unit 16. The annular space 18 is arranged coaxially with the main axis H. An annular piston 19 is arranged in the annular space 18, wherein the annular piston 19 as a cylinder in the annular space 18 can be displaced hydraulically in the axial direction AR. The annular piston 19 is configured in two parts in the axial direction. The housing 15 has a receiving section 20 for receiving the wheel axle 10, wherein the receiving section 20 forms an inner wall of the annular space 18. Further, the housing 15 has an outer wall 21, wherein the outer wall 21 delimits the annular space 18 radially on the outside. The receiving section 20 and the outer wall 21 are formed as an integrated housing base body 22.

[0042] The brake unit 14 has a braking element unit 23, wherein the braking element unit 23 carries the brake disc 13 and is displaced together with the latter in the axial direction AR or in the axial opposite direction GR by the hydraulic unit 16. The braking element unit 23 has a force distribution plate 24, wherein this is designed as a pot with a collar for stability reasons. In a radially inner region, the force distribution plate 24 rests on the annular piston 19 so that the force distribution plate 24 is carried along during an axial movement of the annular piston 19. The braking element unit 23 has a brake base body 25, wherein the braking element body 25 supports the brake disc 13. The brake base body 25 is connected to the force distribution plate 24 via a first, a second and a third screw connection 26 a, b, c, so that during axial movement the brake base body 25 and thus the brake disc 13 are carried along in the axial direction AR.

[0043] FIG. 3 shows an axial plan view of the brake unit 14 in a three-dimensional representation. However, the force distribution plate 24 is omitted in the representation here so that the underlying components can be seen. Firstly, the annular piston 19 can be seen once again, wherein the annular piston 19 is protected against penetrating contamination by a seal 27. Secondly, the screw connections 26 a, b, c can be seen, which are each offset from one another by 120°.

[0044] For guiding the brake base body 25 with the force distribution plate 24 and the annular piston 19 in the transverse direction to the axial direction AR, the brake unit 14 has a master guide 28 and an auxiliary guide 29. The master guide 28 and the auxiliary guide 29 are arranged coaxially to the screw connections 26 a, b and/or also offset by 120°. There is no guide under the third screw connection 26 c, but only a fixation between the force distribution plate 24 and the brake base body 25.

[0045] From a functional point of view, the radial clearance of the master guide 28 is smaller than that of the auxiliary guide 29. This design is supposed to help avoid over-definition. It is ensured in this way that the brake base body 25 and thus the brake disc 13 can be moved without jamming. A further technical effect of the master guide 28 or auxiliary guide 29 is that torques introduced during the braking process can be conducted about the main axis H from the brake disc 13 via the brake base body 25 to the housing 15. The radial clearance can optionally be measured locally with rotational symmetry on the respective guides 28 or 29; alternatively, the radial clearance is measured in the direction of rotation around the main axis H.

[0046] FIG. 2 shows a sectional view of the master guide 28, with the auxiliary guide 29 having an identical design. The master guide 28 has a first axle section 30 a, the axle section 30 a being integrally formed from the brake base body 25. A thread is provided on the radially inner side, in which a screw engages to form the screw connection 26 a. The auxiliary guide 29 has a second axle section 30 b, and the third screw connection 26 c has a third axle section 30 c, wherein the second and third axle sections 30 b, c have the same structure as the first axle section 30 a, so that reference is made to the description thereof.

[0047] The master guide 28 has a first guide section 31 a, wherein the first guide section 31 a receives the first axle section 30 a. In particular, the first guide section 31 a is arranged coaxially and concentrically to the first axle section 30 a. The auxiliary guide 29 has a second guide section 31 b, and the third screw connection 26 c has a third guide section 31 c, wherein the second and third guide sections 31 b, c have the same structure as the first guide section 31 a, so that reference is made to the description thereof.

[0048] The master guide 28 has a first guide sleeve 32 a, wherein the first guide sleeve 32 a is fitted to the first axle section 30 a and provides a guide surface for the first guide section 31 a. The auxiliary guide 29 has a second guide sleeve 32 b, which is fitted onto the second axle section 30 b and provides a second guide surface for the second guide section 31 a. The third screw connection 26 c does not have a guide sleeve so that the radial clearance can optionally be described as very large, in particular larger than the first and second radial clearances, or the third screw connection 26 c does not implement any guide function.

[0049] In this way, the torques introduced about the main axis H from the brake disc 13 due to the braking process are subsequently introduced into the housing 15 via the brake base body 25 via the master guide 28 and the auxiliary guide 29. The housing 15 has a form-fit section 35 which engages in the wheel fork 6 so that the torque can be diverted into the wheel fork 6.

[0050] The brake unit 14 has a return unit 33, the return unit 33 being formed by three return springs 34 a, b, c. FIG. 2 shows the first return spring 34 a, which is designed as a compression spring arranged coaxially with the master guide 18 and/or with the first axle section 30 a and is compressed during an axial movement of the brake disc 13 in the axial direction AR. The second and third return springs 34 b, c are arranged coaxially with the auxiliary guide 29 and coaxially with the second axle section 30 b and coaxially with the third axle section 30 c, respectively, and are also compressed during axial movement of the brake disc 13 in the axial direction AR.

[0051] As soon as the hydraulic pressure in the hydraulic unit 16 decreases, the brake disc 13 can be returned in the axial opposite direction GR by the spring force of the return springs 34 a, b, c.

LIST OF REFERENCE NUMBERS

[0052] 1 Vehicle [0053] 2 Wheel module [0054] 3 Wheel [0055] 4 Rear wheel [0056] 5 Vehicle frame [0057] 6 Wheel fork [0058] 7 Handlebars [0059] 8 Wheel rim [0060] 9 Tires [0061] 10 Wheel axle [0062] 11 Drive device [0063] 12 Braking device [0064] 13 Brake disc [0065] 14 Brake unit [0066] 15 Housing [0067] 16 Hydraulic unit [0068] 17 Connection [0069] 18 Annular space [0070] 19 Annular piston [0071] 20 Receiving section [0072] 21 Outer wall [0073] 22 Housing base body [0074] 23 Braking element unit [0075] 24 Force distribution plate [0076] 25 Brake base body [0077] 26a, b, c Screw connections [0078] 27 Seal [0079] 28 Master guide [0080] 29 Auxiliary guide [0081] 30 a, b, c Axle sections [0082] 31 a, b, c Guide section [0083] 32 a, b Guide sleeve [0084] 33 Return means [0085] 34a,b,c Return springs [0086] 35 Form-fit section