DE102018126957A1 - Brake system, axle carrier unit for a low-floor vehicle, low-floor vehicle with such axle carrier unit and drive unit - Google Patents

Abstract

The invention relates to a brake system (30) having a rotary element (5) rotatable about a rotation axis (D) and a braking device (10) for braking the rotary element (5), wherein the brake device (10) comprises a first brake element (13) between a rest position, in which an annular braking surface (14) of the first braking element (13) concentric with the rotational axis (D) of the rotary member (5) and remote from the rotary member (5) is arranged, is movable to a braking position, in which Brake surface (14) of the first brake element (13) in abutment with the rotary member (5) or with a rotatably connected to the rotary member (5) second brake element (9), wherein on the second brake element (9) or on the rotary member (5 ), in particular on the wheel, a brake pad (33) is arranged, wherein the braking surface (14) of the first brake element (13) in the braking position in contact with the brake pad (33). Furthermore, the invention relates to an axle support unit (4) for a low-floor vehicle, in particular for a skateboard, with such a brake system (30), wherein the rotary element (5) of the brake system is designed as a wheel, and a low-floor vehicle (1) with such Axle carrier unit (4). Another object of the invention is a drive unit with such a brake system (30).

Description

The invention relates to a brake system having a rotary element rotatable about an axis of rotation and a braking device for braking the rotary element, wherein the braking device comprises a first brake element which is disposed between a rest position, in which an annular braking surface of the first brake element concentric with the rotational axis of the rotary element and away from the rotary element is arranged, in a braking position is movable, in which the braking surface of the first brake element is in contact with the rotary member or with a rotatably connected to the rotary member second brake element. In addition, the invention relates to an axle support unit for a low-floor vehicle, in particular for a skateboard, with at least one rotatable about a rotation axis wheel and a braking device for braking the wheel, wherein the braking device comprises a first brake element which is between a rest position in which an annular braking surface the first brake element is concentric with the axis of rotation of the wheel and remote from the wheel, is movable to a braking position in which the braking surface of the first brake member is in contact with the wheel or with a second brake member rotatably connected to the wheel. Furthermore, the invention relates to a low-floor vehicle with such axle support unit. The invention also relates to a drive unit with a previously mentioned brake system, wherein the rotary element of the brake system is designed as a drive element, in particular drive wheel or drive pinion.

A trained as a skateboard low-floor vehicle is for example from the US Pat. No. 6,659,480 B1 known. This skateboard has as rear axle on an axle support unit with two wheels on which a braking device for braking the wheels is arranged. Each wheel is associated with a braking element having an annular braking surface which is disposed in a rest position of the braking element remote from the respective wheel. By means of a pivotable lever, the braking element can be moved to a braking position, in which the braking element rests against a further braking element which is non-rotatably connected to the respective wheel.

In the braking system of this skateboard, there may be greater heat development on the second brake element or the wheel. Such a configuration is particularly disadvantageous if temperature-sensitive devices are arranged inside the wheel or if the second brake element is a part of an electric motor that drives the wheel. This can lead to undesirable overheating of the temperature-sensitive devices or the electric motor. As a result, the life of the electric motor or the vehicle is impaired.

Against this background, the task arises to provide a braking system, in particular for a low-floor vehicle, which allows an increased life.

In a brake system of the type mentioned and in an axle carrier unit of the type mentioned, the object is achieved in that on the second brake element or on the rotary member, a brake pad is arranged, wherein the braking surface of the first brake member is in the braking position in contact with the brake pad ,

According to the invention, a brake pad is arranged on the second brake element or on the rotary element, in particular on the wheel, wherein the braking surface of the first brake element in the braking position is in contact with the brake pad. This results in the advantage that heat generation during braking essentially arises on the braking surface of the first brake element, which is in contact with the brake pad on the second brake element. Thus, the application of heat to the rotary element with heat generated during braking can be reduced. This is particularly advantageous if a heat-sensitive device, such as a sensor, a battery or an electrical circuit, or another heat source are provided on the rotary member, such as a motor for driving the rotary member.

The brake pad of the second brake element preferably has a friction means, which wears off during braking due to the friction during contact with the corresponding first brake element.

Preferably, the brake pad of the second brake element is annular or cylindrical. Particularly preferably, the brake pad is arranged concentrically to the axis of rotation of the rotary element, so that the effective area between the braking surface of the first brake element and the brake pad of the second brake element during braking is as large as possible.

According to an advantageous embodiment, the brake pad of the second brake element is formed segmented. For example, the brake pad may be segmented such that it includes one or more ring segments.

It is preferred if no brake pad is provided on the first brake element, so that the heat generated during braking is almost completely introduced into the first brake element.

According to an advantageous embodiment of the brake pad is preferably releasably connected to the second brake element, so that an exchange of a worn brake pad is possible. The brake pad is preferably positively connected to the second brake element.

Preferably, the first brake element is hydraulically movable between the rest position and the braking position. In such an embodiment, the first brake element is applied to move between the rest position and the braking position with hydraulic pressure, whereby a more uniform distribution of the pressure required for braking pressure force is made possible. As a result, the force introduced into the wheel or into the second brake element provided on the wheel is also distributed more uniformly. The risk of overstressing individual areas of the wheel or the wheel bearing can be reduced in this way. This reduces the likelihood of premature failure of the wheel bearing and increases the life of the vehicle.

Preferably, the first brake element can be moved both hydraulically from the rest position to the braking position and from the braking position to the rest position. Alternatively it can be provided that the first brake element is hydraulically movable from the rest position to the braking position and the braking device has a restoring element, via which the first brake element from the braking position is movable back into the rest position. Such a return element may for example be formed as a spring element.

According to an advantageous embodiment of the invention it is provided that the first brake element is connected to a hollow cylindrical brake piston, which is mounted in a housing having a hollow cylindrical interior for receiving a hydraulic fluid. Such a configuration has the advantage that, compared to a brake device which has a lever or lever mechanism for actuating the first brake element, a smaller space is required. The housing may be arranged concentrically to the axis of rotation of the wheel and / or concentric with an axis portion of the axle support unit. Optionally, the first brake element may be formed integrally with the brake piston.

Alternatively preferably, the first brake element is electromotively movable between the rest position and the braking position.

It has proven to be advantageous if the first brake element is annular and on an inner contour first positive locking elements, in particular a plurality of teeth or wedges, which cooperate with corresponding second interlocking elements on an outer contour of the housing such that the first brake element against rotation around the axis of rotation secured and is movable parallel to the axis of rotation. As a result, a rotational securing of the first brake element relative to the housing with simultaneous axial mobility can be made possible in a structurally simple manner. The outer contour of the housing may be configured in a cooperating with the first brake element area in the manner of a splined shaft or a serration.

In this context, it is advantageous if the housing is clamped on an axle portion of the brake system or the axle support unit, so that no connecting elements for connecting the housing to the axle section are necessary. As a result, the number of parts required for assembly can be reduced, thereby reducing the cost of materials. Preferably, the housing is clamped alternatively or additionally to a stator section of a motor, via which the rotary element can be driven.

Preferably, the axle section has a non-rotationally symmetrical cross section, so that the housing is secured against rotation about the axle section. In this way it can be prevented that the housing of the braking device undesirably rotated relative to the axle portion and it can be recorded occurring during braking of the wheel torque. Alternatively or additionally, the axle section may have an end toothing, which is in engagement with a corresponding toothing on the housing in order to prevent rotation about the axle section. Such a spur toothing can be arranged, for example, on a stop of the axle section, against which the housing of the braking device rests.

According to an advantageous embodiment, it is provided that the second brake element is a housing part of a motor, in particular of an electric motor, for driving the rotary element, in particular wheel. The friction surface for the mechanical braking of the rotary member, in particular wheel, is thus an area of the housing part of the engine. On the housing part, a surface structuring may be provided which promotes the dissipation of heat arising during braking, for example cooling fins. Preferably, the motor is arranged such that the motor can cause a movement of the wheel relative to an axle portion of the brake system or the axle support unit. The engine may be designed, for example, as a wheel hub drive, in particular as a direct drive.

Particularly preferably, the motor is designed as an external rotor motor and / or has an outer rotor, wherein the outer rotor is rotatably connected to the housing part. It is advantageous if the housing part is designed as a rotor sleeve which carries or represents the outer rotor. The rotor sleeve can form a supporting, stabilizing and rotatable element in order to be able to absorb the forces acting on the rotary element, in particular the wheel. Alternatively preferably, the housing part of the rotary member, in particular wheel, detachable, so that the housing part of the rotary member, in particular wheel, can be separated in order to replace the housing part, for example, wear due to braking can.

Preferably, the motor is at least partially disposed within the rotary member, in particular wheel, so that in a brake system or an axle carrier unit with two wheels, the area between the two wheels can be used to arrange other components.

The first brake element preferably has at least one ventilation bore. Such a ventilation hole enlarges the surface of the first brake element and can facilitate the heat transfer from the first brake element to the ambient air.

Preferably, the ventilation hole extends in a direction which is aligned parallel to the axis of rotation of the rotary member.

Preferably, the at least one ventilation hole is formed as a through hole in the first brake element, so that ambient air can penetrate from two opening sides of the through hole in this and the air circulation through the ventilation hole is further improved.

It has proved to be advantageous if the first brake element comprises a plurality of ventilation holes. Preferably, the ventilation holes are formed with different cross section. Particularly preferably, a first ventilation hole, which is arranged closer to the axis of rotation, has a larger cross-sectional area than a second ventilation hole, which is arranged farther from the axis of rotation.

Alternatively or additionally, the ventilation device of the first brake element may have one or more cooling fins, whereby the surface of the first brake element is also increased.

An embodiment has proven to be advantageous in which the housing has an opening through which a cable can be guided substantially parallel to the axis of rotation. Through the opening, a cable for supplying and / or control of an at least partially disposed within the wheel motor, in particular electric motor can be arranged. It is not necessary for the axle carrier unit to have a hollow axle section, for example in the manner of a hollow shaft, through which cables are guided for supplying and / or controlling the motor. This offers the advantage that a more robust axle carrier unit with a solid axle section can be used.

Preferably, the axle support unit has two wheels rotatable about the axis of rotation and two brake devices for braking the wheels. Each of the wheels may include a separate motor for driving the respective wheel. The motors are preferably designed as described above.

Another object of the invention is a low-floor vehicle with an axle support unit described above. The low-floor vehicle is preferably designed as a skateboard, kickboard or scooter.

In the low-floor vehicle, the same advantages can be achieved as have been described in connection with the brake system or the axle support unit.

The low-floor vehicle preferably has a main body, to which one or more axle carrier units are connected. The main body may be formed for example as a board or plate. The main body can provide a footprint for a user of the low-floor vehicle.

Another object of the invention is a drive unit with a brake system described above, wherein the rotary element of the brake system is designed as a drive element, in particular drive wheel or drive pinion.

In the drive unit, the same advantages can be achieved as have been described in connection with the brake system or the axle support unit. Such a drive unit can be used, for example, in an industrial plant, for example a production plant, a robot or a conveyor system.

The drive wheel or drive pinion is preferably connected to a motor, in particular an electric motor, which is arranged such that the motor can cause a movement of the drive wheel or drive pinion with respect to an axle portion of the brake system. The engine may be designed, for example, as a wheel hub drive, in particular as a direct drive.

• 1 ein Ausführungsbeispiel eines erfindungsgemäßen niederflurigen Fahrzeugs in einer schematischen Aufsicht;
• 2 eine beispielhafte Achsträgereinheit mit einem Bremssystem in einer perspektivischen, teilweise geschnittenen Darstellung;
• 3 eine erste Schnittdarstellung durch ein Rad der Achsträgereinheit nach 2, wobei die Schnittebene die Drehachse des Rades enthält;
• 4 eine zweite Schnittdarstellung durch ein Rad der Achsträgereinheit nach 2, wobei die Schnittebene um einen vorgegebenen Winkel gegenüber der Schnittebene nach 3 gedreht ist;
• 5 eine dritte Schnittdarstellung durch ein Rad der Achsträgereinheit nach 2, wobei die Schnittebene senkrecht zu der Drehachse des Rades angeordnet ist;
• 6 ein Ausführungsbeispiel einer Achsträgereinheit gemäß der Erfindung mit einem erfindungsgemäßen Bremssystem in einer Schnittdarstellung durch ein Drehelement, wobei die Schnittebene die Drehachse des Drehelements enthält; und
• 7 das Bremssystem nach 6 in einer Explosionsdarstellung.

Further details and advantages of the invention will be explained below with reference to the embodiments illustrated in the drawings. Hereby shows:

• 1 an embodiment of a low-floor vehicle according to the invention in a schematic plan view;
• 2 an exemplary axle support unit with a braking system in a perspective, partially sectioned view;
• 3 a first sectional view by a wheel of the axle support unit according to 2 wherein the cutting plane includes the axis of rotation of the wheel;
• 4 a second sectional view through a wheel of the axle support unit according to 2 , wherein the cutting plane to a predetermined angle relative to the cutting plane after 3 is turned;
• 5 a third sectional view by a wheel of the axle support unit according to 2 wherein the sectional plane is perpendicular to the axis of rotation of the wheel;
• 6 an embodiment of an axle support unit according to the invention with a brake system according to the invention in a sectional view through a rotary member, wherein the cutting plane includes the axis of rotation of the rotary member; and
• 7 the brake system after 6 in an exploded view.

In the 1 is a schematic plan view of an embodiment of a low-floor vehicle according to the invention 1 shown, which is designed as a skateboard. The vehicle 1 has a basic body 2 on, which is designed as a board and a top surface of a stand 3 for a user of the vehicle 1 provides. At an opposite bottom side of the base body 2 are exactly two axle carrier units 4 arranged, which are formed in two lanes, ie that each axle support unit 4 exactly two wheels 5 includes. The wheels 5 are formed in the embodiment as rollers, for example as hard rubber rollers or polyurethane rollers. The axle carrier units 4 each have two axis sections 6 on, with each axle section 6 each one of the wheels 5 wearing. The axle carrier units 4 are each about a tilting device 7 with the main body 3 connected. These tilting facilities 7 allow tilting or pivoting of the axle carrier units 4 relative to the main body 2 so that the vehicle 1 by shifting the driver's weight on the stand 3 can be spent in a cornering.

The 2 shows a configuration of an axle carrier unit 4 in the low-floor vehicle 1 according to 1 For example, as a rear axle can be used. Alternatively or additionally, such an axle carrier unit 4 as the front axle of the vehicle 1 Find use. The axle carrier unit 4 has two around a rotation axis D rotatable wheels 5 on, with each of the two wheels 5 a braking device 10 for braking the respective wheel 5 assigned. The wheels 5 are each at one of two axle sections 6 the axle carrier unit 4 rotatably arranged. The braking device 10 includes a first brake element 13 that between an in 2 . 3 and 4 shown rest position, in which an annular braking surface of the first brake element 13 concentric with the axis of rotation D of the wheel 5 and away from the wheel 5 is arranged, is movable in a braking position, in which the braking surface 14 of the first brake element 13 in contact with a non-rotatable wheel 5 connected second brake element 9 stands. In the rest position is the braking surface 14 of the first brake element 13 from the wheel 5 spaced so that the first brake element none, the rotational movement of the wheel 5 can develop a delaying effect. Is the braking surface 14 of the first brake element 13 however, in contact with the second brake element 9 , so can a rotational movement of the wheel 5 Delayed over the annular braking surface.

In this respect, the axle carrier unit comprises 4 two brake systems 30 in which the rotary element in each case as a wheel 5 is trained.

In order to achieve the most uniform possible distribution of pressure required for braking, the first brake element 13 hydraulically movable between the rest position and the braking position. This may increase the risk of overstressing individual areas of the wheel 5 or the wheel bearing can be reduced so that increased life of the vehicle can be achieved. The braking surface 14 is formed by a brake pad on the first brake element 13 is arranged.

As the illustration in 3 can be removed, is the braking device 10 designed in the manner of a hydraulic clutch brake. The braking device 10 has one with the first brake element 13 connected hollow cylindrical brake piston 12 on that in a housing 11 is stored, which has a hollow cylindrical interior 11.1 For receiving a hydraulic fluid. The interior 11.1 about one with the brake piston 12 connected sealing element 15 sealed. The housing 11 is on the axle section 6 the axle carrier unit 4 clamped and concentric with the axis of rotation D of the wheel or to the intercept 6 arranged. At the wheel 5 facing side of the housing 11 is a spring element 16 arranged over which an undesirable Hinausgeleiten the brake piston 12 out of the case 11 is prevented. The spring element 16 is formed substantially annular.

The second brake element 9 is a rotatably connected to the wheel housing part of a motor 8th that to the drive of the wheel 5 is provided. The motor 8th is designed as an electric motor and has a fixed to the axle section 6 connected stator and a rotatable relative to the stator rotor, which is connected to the second brake element 9 and the wheel is rotatably connected. For rotatable mounting of the wheel 5 and the second brake element 9 are a first camp 20 on an inside of the wheel 5 and a second camp 21 on an outside of the wheel 5 intended. The first camp 20 and / or the second bearing 21 are designed as rolling bearings. The motor 8th is essentially inside the wheel 5 arranged. Furthermore, the housing has 11 an opening 17 on, through which a cable 18 parallel to the axis of rotation D is guided, which in 3 only partially shown. About the cable 18 can the engine 8th be supplied with electrical energy and / or electrically controlled. When mounting the axle carrier unit 4 First, the braking device 10 on the axle section 6 deferred until the housing is in contact with a stop of the axle section, cf. 4 , In a subsequent step, the engine becomes 8th possibly together with the bike 5 on the axle section 6 pushed until the engine 8th in contact with the housing 11 the braking device 10 stands. In the assembled state is an annular stop area of the engine 8th in a receiving area on the inner contour of the housing 11 added.

About in the interior 11.1 existing hydraulic fluid can be a hydraulic pressure on the brake piston 12 and thus the first brake element 13 be exercised. As the illustration in 4 can be removed, the housing has 11 to initiate the hydraulic fluid a fluid port 19 on. There is also a vent port 22 intended.

In the 5 is a sectional view through a wheel 5 the axle carrier unit 4 shown, wherein the sectional plane perpendicular to the axis of rotation D of the wheel 5 is arranged. It can be seen that the annular braking surface 14 of the first brake element 13 concentric with the axis of rotation D of the wheel 5 is arranged. The braking surface may for example be formed as a brake pad, on the second brake element 9 facing surface of the first brake element 13 is arranged. The first brake element 13 is formed substantially annular and has at a the housing 11 facing inner contour first positive locking elements 24 on. These positive locking elements 24 are formed as in the circumferential direction of the inner contour adjacent teeth and correspond to second positive locking elements 23 attached to an outer contour of the housing 11 are provided. About the first and second positive locking elements 23 . 24 an anti-rotation is achieved, which is an undesirable rotation of the first brake element 13 opposite the housing 11 prevented. The first and second positive locking elements 23 . 24 simultaneously allow a guided movement of the first braking element 13 opposite the housing 11 in a direction parallel to the axis of rotation D of the wheel 5 ,

The wheel 5 receiving axle section 6 also has a non-rotationally symmetrical cross section, which has the advantage that the housing 11 against twisting about the axle section 6 is secured.

The 6 and 7 show an embodiment of a brake system 30 according to the invention. The brake system 30 according to 6 can as part of an axle carrier unit 4 be provided, which in the low-floor vehicle 1 according to 1 For example, as a rear axle can be used. Alternatively or additionally, such an axle carrier unit 4 as the front axle of the vehicle 1 Find use.

The brake system 30 has an axis of rotation D rotatable rotary member, which is designed as a wheel. The wheel 5 is at an axis section 6 of the brake system 30 rotatably arranged. Another component of the braking system 30 is a braking device 10 with a first brake element 13 that between an in 6 shown rest position in which an annular braking surface 14 of the first brake element 13 concentric with the axis of rotation D of the wheel 5 and away from the wheel 5 is arranged, is movable in a braking position, in which the braking surface 14 of the first brake element 13 in contact with a non-rotatable wheel 5 connected second brake element 9 stands. In the rest position is the braking surface 14 of the first brake element 13 from the wheel 5 spaced so that the first brake element 9 none, the rotational movement of the wheel 5 can develop a delaying effect. Is the braking surface 14 of the first fuel assembly 13 however, in contact with the second brake element 9 , so can a rotational movement of the wheel 5 over the annular braking surface 14 be delayed.

In order to achieve the most uniform possible distribution of pressure required for braking, the first brake element 13 hydraulically movable between the rest position and the braking position. The first brake element 13 is in the Essentially annular and has at a the housing 11 facing inner contour first positive locking elements 24 on. These positive locking elements 24 are formed as in the circumferential direction of the inner contour adjacent teeth and correspond to second positive locking elements 23 attached to an outer contour of the housing 11 are provided. About the first and second positive locking elements 23 . 24 an anti-rotation is achieved, which is an undesirable rotation of the first brake element 13 opposite the housing 11 prevented. The first and second positive locking elements 23 . 24 simultaneously allow a guided movement of the first braking element 13 opposite the housing 11 in a direction parallel to the axis of rotation D of the wheel 5 ,

The brake system 30 is essentially the same as in 2-5 shown braking system, with the difference that on the first brake element 9 no brake pad is arranged. A brake pad 33 is however on a the first brake element 13 facing surface of the second brake element 9 arranged. The brake pad 33 is formed substantially annular and in an annular recess of the second brake element 9 added. The connection between the brake pad 33 and the second brake element 9 is detachable, so that the brake pad 33 if necessary, for example, when a certain degree of wear, can be replaced.

Furthermore, the first brake element 13 in the embodiment according to 6 and 7 integral with the brake piston 12 educated.

The brake pad 33 comprises a friction means that in the braking position of the first brake element 13 in contact with the braking surface 14 of the first brake element 13 stands. By friction between the braking surface 14 and the brake pad 33 During braking, heat is generated essentially at the braking surface 14 of the first brake element 13 , Another source of heat is an engine 8th to drive the wheel 4 dar. The engine 8th is designed as an electric motor and has a fixed to the axle section 6 connected stator and a rotatable relative to the stator rotor, which is connected to the second brake element 9 and the wheel is rotatably connected, see. also the corresponding description to the in 2-g shown braking system.

To dissipate the heat generated during braking of the first brake element 13 to promote the ambient air, the first brake element is made of a material having high thermal conductivity, for example a metal, in particular steel. Further, in the first brake element 13 ventilation holes 31 . 32 provided, which is the surface of the first brake element 13 increase and thereby improve the heat exchange with the ambient air. The ventilation holes 31 . 32 run in a direction parallel to the axis of rotation D of the wheel 5 is aligned. Furthermore, the ventilation holes 31 . 32 as through-holes in the first brake element 13 designed so that in the in 6 shown rest position of the first brake element 13 Air can flow through two bore holes in the through hole. In the braking position is a ventilation of the through hole through a bore opening at the second brake element 9 opposite side of the first brake element 13 possible.

The ventilation holes 31 . 32 are arranged on several virtual circles that are concentric about the axis of rotation D is arranged. Here are the ventilation holes 31 . 32 different bore cross sections on. ventilation holes 31 . 32 which are arranged on the same virtual circle preferably have an identical bore cross-section. Particularly preferred is the bore cross-section of the ventilation holes 31 closer to the axis of rotation D are arranged larger than the bore cross section of the ventilation holes, the farther from the axis of rotation D are arranged.

The low-floor vehicle described above 1 in the form of a skateboard comprises an axle carrier unit 4 with at least one about a rotation axis D rotatable rotary element 5 and a brake device 10 for braking the rotary element 5 , wherein the braking device 10 a first brake element 13 that between a rest position, in which an annular braking surface 14 of the first brake element 13 concentric with the axis of rotation D of the rotary element 5 and away from the wheel 5 is arranged, is movable in a braking position, in which the braking surface 14 of the first brake element 13 in contact with the bike 5 or a rotation with the wheel 5 connected second brake element 9 stands, wherein on the second brake element 9 or on the rotary element 5 a brake pad 33 is arranged, wherein the braking surface 14 of the first brake element 13 in the braking position in contact with the brake pad 33 stands.

According to a modification of the embodiment shown, the brake system described 30 Part of a drive unit having a trained as a drive wheel or drive pinion rotary member. Such drive units can be used, for example, in industrial plants, in particular in production plants, production robots or conveyor systems.

LIST OF REFERENCE NUMBERS

1

Low-floor vehicle

2

body

3

footprint

4

axle carrier

5

wheel

6

intercept

7

tilter

8th

engine

9

second brake element

10

braking means

11

casing

11.1

inner space

12

brake pistons

13

first brake element

14

brake surface

15

sealing element

16

spring element

17

opening

18

electric wire

19

liquid port

20

camp

21

camp

22

exhaust port

23

Form-fitting element

24

Form-fitting element

30

braking system

31

ventilation opening

32

ventilation opening

33

brake lining

D

axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 6659480 B1 [0002]

Claims (17)

A braking system (30) having a rotary element (5) rotatable about an axis of rotation (D) and a braking device (10) for braking the rotary element (5), wherein the braking device (10) comprises a first braking element (13) which is disposed between a rest position, in which an annular braking surface (14) of the first braking element (13) is arranged concentric with the axis of rotation (D) of the rotary element (5) and remote from the rotary element (5), is movable to a braking position in which the braking surface (14) the first brake element (13) is in contact with the rotary element (5) or with a second brake element (9) rotatably connected to the rotary element (5), characterized in that on the second brake element (9) or on the rotary element (5) a brake pad (33) is arranged, wherein the braking surface (14) of the first brake element (13) in the braking position is in contact with the brake pad (33). Braking system (30) after Claim 1 , characterized in that the first brake element (13) is hydraulically movable between the rest position and the braking position. Braking system (30) after Claim 2 , characterized in that the first brake element (13) with a hollow cylindrical brake piston (12) is connected, which is mounted in a housing (11) having a hollow cylindrical interior (15) for receiving a hydraulic fluid. Braking system (30) after Claim 3 , characterized in that the first brake element (13) is annular and on an inner contour first positive locking elements (24), in particular a plurality of teeth or wedges, which cooperate with corresponding second positive locking elements (23) on an outer contour of the housing (11) in that the first brake element (13) is secured against rotation about the axis of rotation (D) and is movable parallel to the axis of rotation (D). Braking system (30) according to one of Claims 3 or 4 , characterized in that the housing (11) is clamped to an axle portion (6) of the brake system. Braking system (30) after Claim 5 characterized in that the axle portion (6) has a non-rotationally symmetrical cross section such that the housing (11) is secured against rotation about the axle portion (6); and / or that the axle portion (6) has a spur gear which is in engagement with a corresponding toothing on the housing (11) to prevent rotation about the axle portion (6). Brake system (30) according to one of the preceding claims, characterized in that the second brake element (9) is a housing part of a motor (8) for driving the rotary element (5). Braking system (30) after Claim 7 , characterized in that the motor (8) is at least partially disposed within the rotary member (5). Brake system (30) according to one of the preceding claims, characterized in that the first brake element (13) has at least one ventilation bore (31, 32). Braking system (30) after Claim 9 characterized in that the venting bore (31, 32) extends in a direction parallel to the axis of rotation (D) of the rotary member (5). Braking system (30) according to one of Claims 9 or 10 , characterized in that the at least one ventilation bore (31, 32) is formed as a through hole in the first brake element (13). Brake system (30) according to any one of the preceding claims, characterized in that the first brake element comprises a plurality of ventilation holes (31, 32) which are formed with different cross-section, wherein a first ventilation hole (31), which is arranged closer to the axis of rotation (D) is, has a larger cross-sectional area than a second vent hole (32), which is located farther from the axis of rotation (D). Brake system (30) according to any one of the preceding claims, characterized in that the housing (11) has an opening (17) through which a cable (18) is guided substantially parallel to the axis of rotation (D). Axle carrier unit (4) for a low-floor vehicle, in particular for a skateboard, with a brake system (30) according to one of the preceding claims, wherein the rotary element (5) of the brake system is designed as a wheel. Axle carrier unit after Claim 14 , characterized by two rotating elements (5) designed as wheels and rotatable about the axis of rotation (D) and two braking devices (10) for braking the wheels. Low-floor vehicle (1), in particular skateboard, with an axle carrier unit (4) according to one of Claims 14 or 15 , Drive unit with a brake system (30) according to one of Claims 1 to 13 , wherein the rotary element (5) of the brake system (30) as Drive element, in particular drive wheel or drive pinion, is formed.

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