DE102019118026A1 - Brake device for an electric bicycle and electric bicycle with the brake device - Google Patents

Abstract

Various braking devices for braking a wheel of bicycles, in particular of electrically assisted bicycles, are known. It is an object of the invention to propose a braking device which is characterized by a compact design. For this purpose, a braking device 1 with a multi-disc brake 3, the multi-disc brake 3 having a stationary brake unit 4 and a rotating brake unit 5, the rotating brake unit 5 being relatively is rotatable about an axis of rotation D in relation to the stationary brake unit 4, with an actuating device 11 for actuating the multi-disc brake 3, the actuating device 11 having a piston housing 12 and an actuating piston 13, which can be axially displaced in the piston housing 12, for transmitting an actuating force F1 to the multi-disc brake 3, The rotating brake unit 5 has an outer carrier 9 and several brake disks 10 non-rotatably connected to it, and the stationary brake unit 4 has an inner carrier 7 and several brake linings 8 non-rotatably connected to it, at least one of the brake linings 8 is carried by the actuating piston 13.

Description

The invention relates to a braking device for an electric bicycle with the features of the preamble of claim 1. Furthermore, the invention relates to an electric bicycle with the braking device.

Various braking devices for braking a wheel of bicycles, in particular of electrically assisted bicycles, are known. These braking devices are usually designed as rim brakes or disc brakes, such braking devices being arranged outside the wheel. There are also known braking devices which are integrated into the wheel, in particular in combination with a wheel hub motor.

The pamphlet DE 10 2010 032 853 A1 , which probably forms the closest prior art, discloses a wheel hub motor with a stator, which is rotatably connected to a wheel axle, with a rotor for driving an impeller which is rotatably supported in a rotor housing relative to the stator on the wheel axle, the rotor housing forms a hub housing and wherein the motor can be switched to a generator mode in which it acts as a regenerative brake. A mechanical auxiliary brake device is also arranged in the rotor housing, which in addition to the regenerative brake can be activated via an actuating mechanism. In particular, the additional brake device is a magnetorheological brake device or a multi-plate clutch brake.

It is the object of the invention to propose a braking device of the type mentioned at the beginning, which is characterized by a compact design. A further object of the invention is to propose an electric bicycle with the braking device.

This object is achieved by a braking device with the features of claim 1 and by an electric bicycle with the features of claim 10. Preferred or advantageous embodiments of the invention emerge from the subclaims, the following description and the attached figures.

The invention relates to a braking device which is designed and / or suitable for an electric bicycle. In particular, the electric bicycle is designed as a bicycle with a pedal-assisting auxiliary drive, also known as a pedelec (“pedal electric cycle”). Alternatively, however, the electric bicycle can also be designed as a bicycle with an additional drive that is independent of pedaling, e.g. an e-bike or an e-scooter. The electric bicycle is particularly preferably designed as a four-wheel pedelec. In particular, however, an electric bicycle can also be understood to mean a multi-lane electromobile and / or an electrically powered light vehicle.

The braking device has a multi-disc brake, also known as a full disc brake. In particular, the multi-disc brake is and / or can be integrated into a wheel hub and / or a wheel hub drive of a wheel, preferably a front or rear wheel, of the bicycle. The multi-disc brake is preferably designed as a multi-disc brake. The multi-disc brake has a stationary brake unit, which is designed and / or suitable for fixing to a frame of the bicycle, in particular a wheel axle of the wheel. In particular, the stationary brake unit is indirectly connected in a rotationally fixed manner, e.g. via a stator of the wheel hub drive, or directly to the frame, in particular the wheel axle.

Furthermore, the multi-disc brake has a rotating brake unit which is designed and / or suitable for fixing to the wheel, in particular a hub housing of the wheel. In particular, the rotating brake unit is connected indirectly, e.g. via a rotor of the wheel hub drive, or directly to the wheel, in particular the hub housing, in a rotationally fixed manner. When the bicycle is in travel mode, the rotating brake unit can thus be rotated about an axis of rotation relative to the stationary brake unit, the stationary brake unit preferably remaining stationary on the frame.

The braking device has an actuating device which is designed and / or suitable for actuating the multi-disc brake. In particular, the actuating device is arranged coaxially to the axis of rotation. The actuating device can preferably be actuated pneumatically or hydraulically. The actuating device has a piston housing and an actuating piston which can be axially displaced in the piston housing. The function of the actuating piston is to transfer an actuating force to the multi-disc brake when the braking device is actuated, so that when the braking device is actuated, a frictional connection is formed between the two brake units and a braking torque is transferred to the wheel. In particular, the actuating piston is operatively connected to the first and / or the second brake unit for this purpose.

When the multi-disc brake is closed, the actuating force is applied to the actuating piston in an axial direction, the actuating piston relative to one another in the axial direction, the brake linings and the brake disks shifted or pressed so that the braking torque is generated. When the multi-disc brake is opened, the actuating force acting on the actuating piston is reduced or interrupted, the actuating piston automatically returning in an opposite axial direction, preferably via a restoring force acting on the actuating piston.

In the context of the invention, it is proposed that the rotating brake unit have an outer carrier and several brake disks connected to the outer carrier in a rotationally fixed manner. In particular, the outer carrier is non-rotatably connected to the wheel hub housing and / or to the rotor of the wheel hub drive. The rotating brake unit preferably has at least or precisely two of the brake disks. In addition, the stationary brake unit has an inner carrier and a plurality of brake linings connected to the inner carrier in a rotationally fixed manner.

In particular, the inner carrier is non-rotatably connected to the wheel axle and / or the stator of the wheel hub drive. The stationary brake unit preferably has at least or precisely two, in particular precisely four, of the brake linings.

In particular, the outer and the inner carrier are arranged coaxially and / or concentrically to one another with respect to the axis of rotation, the inner carrier being arranged radially inside the outer carrier. A brake disc is preferably arranged between two adjacent brake linings. In principle, the plurality of brake disks and the plurality of brake pads can be arranged one behind the other in an alternating sequence in the axial direction. Preferably, however, two brake pads are arranged between two adjacent brake disks, one brake pad being assigned to one brake disk and the other brake pad being assigned to the other brake disk.

It is also provided that at least or precisely one of the brake linings is carried by the actuating piston. The at least one brake lining is preferably connected to the actuating piston in a rotationally fixed manner. In particular, the at least one brake lining is connected indirectly, preferably via a transmission component, or directly to the actuating piston. In particular, the inner carrier is formed by the actuating piston, with preferably all or at least a large part of the brake linings of the multi-disc brake being fixed on the actuating piston in a rotationally fixed manner.

The advantage of the invention is that the arrangement of the at least one brake lining on the actuating piston means that the braking device can be made significantly more compact. By arranging several brake linings on the actuating piston, both a radial and an axial installation space can be saved, so that the braking device can be integrated particularly easily into the wheel hub or the wheel hub drive. In addition, a braking device with fewer components is created, which is characterized on the one hand by a simplified assembly and on the other hand by a more cost-effective fastening.

In a specific embodiment of the invention it is provided that the piston housing is designed as an annular housing encircling the axis of rotation and the actuating piston is designed as an annular piston encircling the axis of rotation. In particular, the actuation device is designed in the manner of a concentric slave cylinder (CSC). For this purpose, the annular housing and the annular piston are arranged coaxially and / or concentrically to one another with respect to the axis of rotation. In particular, the annular piston is designed to be rotationally symmetrical with respect to the axis of rotation.

According to this embodiment, the ring housing defines an annular pressure space, in particular surrounding the axis of rotation, which is delimited in an axial direction with respect to the axis of rotation by the actuating piston. In an installation situation, the pressure chamber is in particular fluidly connected via a brake line to a master cylinder, which can preferably be actuated by a brake lever or brake pedal. The pressure chamber is particularly preferably filled with a fluid, in particular a hydraulic fluid. The actuating piston can have a sealing device which is designed and / or suitable for sealing off the pressure chamber in the axial direction. The sealing device preferably comprises a groove sealing ring which rests against the piston housing in a sealing manner around the circumference.

A braking device is thus proposed which is characterized by a particularly simple and compact actuating device. By designing the actuating device as a concentric slave cylinder, the actuating force can also be transmitted to the multi-disk brake evenly over the entire circumference.

In a further specification, provision is made for the stationary brake unit to have a support sleeve which is designed and / or suitable for radial support on the wheel axle of the bicycle. In particular, the support sleeve is designed in a rough shape as a cylinder sleeve. Preferably, the support sleeve is positively and / or non-positively connected to the wheel axle at least in the direction of rotation with respect to the axis of rotation.

According to this embodiment, the pressure chamber is delimited in a radial direction by the piston housing, in particular the ring housing, and in a radially opposite direction by the support sleeve, the actuating piston being guided by the support sleeve in the axial direction and in the axially opposite direction. In particular, the piston housing is supported radially and / or axially on the support sleeve. For the axial support of the piston housing, the support sleeve can preferably have a radially outwardly directed end section, for example a securing flange, or a securing means, for example a securing ring, arranged on the outer circumference. In particular, the piston housing can be connected to the support sleeve in a rotationally fixed manner, in particular via the end section designed as a securing flange.

Thus, a braking device is proposed which is characterized by a particularly compact structure. For this purpose, the support sleeve can combine several functions, such as piston guidance, delimitation of the pressure chamber, fastening and / or support of the piston housing, etc.

In a further development, it is provided that the actuating piston has a form-fit contour and the support sleeve has a counter-contour, which are in engagement with one another to introduce the braking torque into the support sleeve. The form-fit contour is preferably designed as an internal toothing arranged on an inner circumference of the actuating piston and the counter-contour is designed as an external toothing arranged on an outer circumference of the support sleeve. Particularly preferably, the inner and outer toothing are each designed as a longitudinal toothing aligned in the axial direction, the actuating piston and the support sleeve being rotationally fixed to one another via the longitudinal toothing and being displaceable relative to one another in the axial direction.

It can optionally be provided that at least one of the brake linings is in direct engagement with the counter-contour of the support sleeve, in particular via the transmission component.

Optionally, it can be provided that a further counter-contour, in particular a further toothing, is arranged on an inner circumference of the support sleeve, which is designed and / or suitable for a rotationally fixed coupling with a corresponding form-fit contour of the wheel axle. In particular, the counter-contour and the further counter-contour can be formed by a common embossing, so that one counter-contour is formed by a negative of the other counter-contour.

A support sleeve is thus proposed which is expanded to include the function of the non-rotatable coupling. Due to the counter-contours introduced into the support sleeve, the support sleeve can be fixed particularly easily on the actuating piston or the wheel axle.

In an alternative development, it is provided that the actuating piston has a form-fitting contour and the piston housing has a counter-contour, which are in engagement with one another to introduce the braking torque into the piston housing. The form-fit contour is preferably designed as an internal toothing arranged on an inner circumference of the actuating piston and the counter-contour is designed as an external toothing arranged on an outer circumference of the piston housing, in particular the ring housing. Particularly preferably, the internal and external toothing are each designed as a longitudinal toothing aligned in the axial direction, the actuating piston and the piston housing being rotationally fixedly coupled to one another via the longitudinal toothing and being displaceable relative to one another in the axial direction. In this embodiment, the piston housing and the support sleeve are particularly preferably connected to one another in a rotationally fixed manner, so that the braking torque is introduced into the support sleeve via the piston housing.

A piston housing is therefore proposed which is expanded to include the function of the non-rotatable coupling. The actuating piston can be attached to the piston housing in a particularly simple manner by virtue of the mating contour introduced into the piston housing.

In a further constructive implementation it is provided that the actuating piston has a radially outwardly directed pressing section. In particular, the pressing section is designed as a circular ring section directed radially outward. Optionally, the actuating piston has a piston section which is arranged inside the piston housing, the pressing section adjoining the piston section in the radial direction. The sealing device is preferably arranged at the end of the piston section.

According to this embodiment it is provided that the pressing section carries at least or exactly one of the brake linings. In the actuated state of the braking device, the actuating force is transmitted to the multi-disc brake via the pressing section. For this purpose, the brake lining arranged on the pressing section is arranged adjacent to one of the brake disks, with the actuating force being transmitted to the brake disks and the brake linings via the pressing section when the multi-disc brake is closed. Particularly preferably, the brake lining is positively and / or non-positively and / or cohesively with the Press section connected. Alternatively, however, the brake lining can also be formed by a coating.

Thus, a braking device is proposed which is characterized by a compact actuating device with fewer components. Through the pressing section, the actuating force can be transmitted directly to the multi-disc brake via the actuating piston, so that, for example, an additional pressure plate or pressure pot can be dispensed with.

Another constructive implementation provides that the actuating piston has a cylindrical support section. The carrier section preferably extends in the axial direction, in particular in the opposite direction to the piston section, outside the piston housing. The carrier section adjoins the piston section and / or the pressing section in the axial direction, the carrier section preferably being designed as a hollow cylinder.

According to this embodiment it is provided that the carrier section has a longitudinal toothing on its outer circumference, at least one of the brake linings being fixed on the carrier section in a rotationally fixed manner via the longitudinal toothing. In particular, the longitudinal toothing extends in the axial direction with respect to the axis of rotation, so that the at least one brake lining which is in engagement with the longitudinal toothing can be displaced in the axial direction. In principle, the brake lining can be designed as a friction disk which has a counter-toothing complementary to the longitudinal toothing on its inner diameter. However, the at least one brake lining is preferably connected to the carrier section via the transmission component, the transmission component having a counter-toothing complementary to the longitudinal toothing on an inner circumference. In particular, several, in particular exactly two, of the transmission components can be in engagement with the longitudinal teeth of the carrier section.

It is therefore a consideration of the invention to propose an actuating piston which also serves as an inner support for the brake linings. In addition, the proposed configuration can further reduce the radial installation space and the components of the braking device.

In a further specific embodiment it is provided that the stationary brake unit has a stop component, in particular arranged coaxially to the axis of rotation, which is designed and / or suitable for forming an end stop in the axial direction. When the brake is closed, the brake disks and the intermediate brake linings are preferably pressed together between the stop component and the actuating piston, in particular the pressing section. The stop component is particularly preferably arranged in an end region of the support sleeve, the stop component being fixed to the support sleeve in the radial and / or axial direction. The stop component is preferably fixed to the support sleeve in the axial direction via a securing means arranged on the outer circumference, e.g. a securing ring or a screw nut. Particularly preferably, the stop component carries one of the brake linings, the brake lining being connected to the stop component in a form-fitting and / or non-positive and / or cohesive manner. Alternatively, however, the brake lining can also be formed by coating the stop component.

According to this embodiment it is provided that the stop component is non-rotatably connected to the actuating piston via the longitudinal toothing. The stop component preferably has a toothed section which is in engagement with the longitudinal toothing of the actuating piston. In addition, the stop component can have a support section for supporting on the support sleeve and a stop section for forming the end stop. The stop section is preferably directed radially outward in the manner of a flange. The support section and / or the toothed section are preferably directed radially inward in the manner of a flange. In particular, a spring device for generating the restoring force can be supported in the axial direction on the stop component, in particular the support section, and in the opposite axial direction on the actuating piston, in particular the carrier section.

A particularly robust and component-protecting braking device is therefore proposed, the stop component forming an end stop for the multi-disc clutch and at the same time transmitting the braking and / or drag torques acting on the stop component to the actuating piston via the toothed section. It can thus be ensured that the moments are not transferred to the securing device.

In an alternative embodiment it is provided that the support sleeve has an end section which is designed and / or suitable for forming the end stop in the axial direction. When the brake is closed, the brake disks and the brake linings lying in between are preferably pressed together between the end section and the actuating piston, in particular the pressing section. The end section is preferably formed by primary shaping and / or by primary shaping of the support sleeve. The end section is particularly preferred as a radially outward one directed flange formed. In particular, the end section carries one of the brake linings. In particular, the spring device can be supported in the axial direction on the end section and in the opposite axial direction on the actuating piston, in particular the carrier section.

A braking device is thus proposed which is characterized by a further reduction in the number of components, since the support sleeve also takes on the function of the end stop.

Another object of the invention relates to an electric bicycle with the braking device as already described above. The electric bicycle is particularly preferably designed as the pedelec, in particular as a four-wheel pedelec. The braking device, in particular at least the multi-disc brake, is particularly preferably integrated into a wheel of the bicycle. The bicycle can have several, preferably exactly two, in particular exactly four, of the braking devices, one braking device in each case being assigned to one of the wheels of the bicycle.

• 1 eine schematische Schnittdarstellung einer Bremsvorrichtung für ein elektrisches Fahrrad als ein erstes Ausführungsbeispiel;
• 2 die Bremsvorrichtung in gleicher Darstellung wie 1 als ein zweites Ausführungsbeispiel der Erfindung.

Further features, advantages and effects of the invention emerge from the following description of preferred exemplary embodiments of the invention and the accompanying figures. These show:

• 1 a schematic sectional view of a braking device for an electric bicycle as a first embodiment;
• 2 the braking device in the same representation as 1 as a second embodiment of the invention.

The 1 and 2 each show a braking device in a schematic sectional view 1 in two different versions. The braking device 1 is suitable for an electric bicycle, with the braking device 1 for example in a wheel hub and / or a wheel hub drive of a wheel 2 - only indicated schematically - the electric bicycle can be integrated. The braking device 1 has, for example, a diameter of less than 80 mm. For example, the electric bicycle is designed as a four-wheel pedelec, with the braking device 1 is designed accordingly for the weight of the four-wheel pedelec. The four-wheel pedelec has an empty weight of, for example, more than 150 kg, preferably more than 250 kg, in particular more than 350 kg.

The braking device 1 includes a multi-disc brake 3 , with the multi-disc brake 3 a fixed brake unit 4th and a rotating brake unit 5 having which in a driving mode of the bicycle relative to the fixed brake unit 4th around an axis of rotation D. rotates. The fixed brake unit 4th is on a frame 6th - only indicated schematically - of the bicycle, for example on a wheel axle of the wheel 2 , set. The rotating brake unit 4th is right on the bike 2 , for example on a wheel hub housing, or indirectly via the wheel hub drive, for example a rotor, on the wheel 2 set.

The fixed brake unit 4th has an inner support 7th as well as four brake pads 8th on which on the inside support 7th in the direction of rotation in relation to the axis of rotation D. Are rotatably arranged. The inside carrier 7th rotates with the frame 6th , in particular the wheel axle, connected, the inner carrier 7th when the wheel rotates 2 remains stationary on the frame. The rotating brake unit 5 has an outer beam 9 as well as two brake discs 10 on which on the outer carrier 9 in the direction of rotation in relation to the axis of rotation D. Are rotatably arranged. The balcony 9 is by bike 2 pivotally connected, the outer beam 9 when the wheel rotates 2 around the axis of rotation D. is twisted and the brake discs 10 takes along in the direction of rotation. The inside carrier 7th is radially inside the outer beam 5 arranged, the brake discs 10 such between the brake pads 8th are arranged so that the two brake discs 10 each between two brake pads 8th are arranged. For example, the brake pads 8th and the brake discs 10 each as one the axis of rotation D. circumferential circular disc.

Furthermore, the braking device 1 an actuator 11 to operate the multi-disc brake 3 on, the actuator 11 is designed as a concentric slave cylinder (CSC). To this end, the actuating device 11 a piston housing designed as an annular housing 12th and an actuating piston designed as an annular piston 13th on, which is inside the piston housing 12th in relation to the axis of rotation D. is arranged axially displaceable. In addition, the stationary brake unit 4th a support sleeve 14th which is formed, for example, similar to a CSC guide sleeve. The piston housing 12th is on an outer circumference of the support sleeve 14th supported, the piston housing 12th and the support sleeve 14th together a pressure room 15th define. Here is the pressure chamber 15th in a radial direction RR through the piston housing 12th and in a radial opposite direction RG through the support sleeve 14th limited. In addition, there is the pressure room 15th in an axial direction AR through the actuating piston 13th and in an opposite axial direction AG through the piston housing 12th limited. The printing room 15th is as a the axis of rotation D. formed circumferential annular space which is filled with a fluid, for example a hydraulic fluid. For example, the pressure space 15th fluidly connected to a master cylinder which can be actuated, for example, by a brake lever.

For sealing the pressure chamber 15th the actuating piston 13th a sealing device 16 on which end on the actuating piston 13th is mounted. The sealing device 16 includes one coaxial with the axis of rotation D. arranged groove sealing ring 17th and a sealing ring carrier 18th , the groove sealing ring 17th over the sealing ring carrier 18th positively and / or non-positively, for example via a snap hook connection, on the actuating piston 13th is mounted. The groove sealing ring 17th lies in the radial direction RR on an inner circumference of the piston housing 12th and in the radial opposite direction RG on an outer circumference of the support sleeve 14th all round sealing.

The actuating piston 13th has a piston portion 19th , a pressing section 20th and a support section 21st on, with the sections 19th , 20th , 21st in one piece, for example made from a common semi-finished product, are connected to one another. The piston section 19th protrudes in the opposite axial direction AG in the piston housing 12th into it, the sealing device 16 at the end of the piston section 19th is arranged. The pressing section 20th closes in the radial direction RR to the piston section 19th on, the pressing section 20th one of the brake pads 8th wearing. The carrier section 21st closes in the axial direction AR to the pressing section 20th or the piston section 19th on, the carrier section 21st than one coaxial with the axis of rotation D. arranged hollow cylinder is formed, which the function of the inner support 7th takes over.

The fixed brake unit 4th has a transmission component 22nd on, the transmission component 22nd two of the brake pads 8th wearing. The brake linings are in this way on the transmission component 22nd arranged so that the one brake lining 8th the one brake disc 10 and the other brake pad 8th the other brake disc 10 is facing. For example, the transmission component 22nd designed as a drive plate axially between the two brake discs 10 is arranged. The carrier section 21st has a longitudinal toothing on its radial outside 23 on, the transmission component 22nd via a corresponding counter-toothing 24 with the spline 23 is engaged. The transmission component 22nd is thus in the direction of rotation around the axis of rotation D. non-rotatably with the actuating piston 13th connected and in the axial direction AR and the opposite axial direction AG slidable on the carrier section 21st arranged.

The balcony 9 is designed, for example, in the manner of an outer disk carrier. The outer carrier 9 a driving contour on its inner circumference 11 , for example in the form of a spline, with the two brake discs 10 rotationally fixed in the circumferential direction and in the axial direction with respect to the axis of rotation D. movable with the driving contour 11 are engaged.

In the in the 1 The first embodiment shown has the fixed brake unit 4th a stop component 25th on, which is an end stop for the multi-disc brake 3 in the axial direction AR forms. The stop component 25th is at the end of the support sleeve 14th via a securing means 26th , for example via a nut or other securing element, on the support sleeve 14th fixed. The stop component 25th has a radially inwardly directed support portion 27 and a stop section directed radially outward 28 on, the stop section 28 forms the end stop and one of the brake pads 8th wearing. About the support section 27 is the stop component 25th in the radial and the axial opposite direction RG , AG on the support sleeve 14th and in the axial direction AR on the securing means 26th supported. In addition, the stop component has a toothed section directed radially inward 29 on, the toothed section 29 with the spline 23 of the carrier section 21st is engaged.

In the first embodiment, the inner support is 7th through the actuating piston 13th , in particular the carrier section 21st , formed, the actuating piston 13th for this purpose non-rotatably with the piston housing 12th connected is. The actuating piston 13th has one, in particular on the pressing section 20th molded, form-fitting contour 30th and the piston housing 12th a mating contour arranged on the radial outside 31 on, the form-fitting contour 30th and the opposite contour 31 in the direction of rotation around the axis of rotation D. are positively engaged with each other. For example, the form-fit contour 30th as an internal toothing and the counter contour 31 designed as an external toothing.

The piston housing 12th can in turn rotatably with the support sleeve 14th be connected so that the on the piston housing 12th transmitted moments in the support sleeve 14th be initiated. The support sleeve 14th has a radially outwardly directed end portion 32 on, with the piston housing 12th in the opposite axial direction AG at the end portion 32 supported and / or rotatably connected to this. In the first embodiment, the end portion 32 designed as a securing flange.

When the multi-disc brake is actuated 3 by the actuator 11 , becomes one in the pressure room 15th prevailing fluid pressure increases and as an operating force F1 on the Actuating piston 13th , in particular the piston section 19th , transfer. The actuating piston is thereby 13th in the axial direction AR moved, the pressing section 20th the actuation force F1 on the multi-disc brake 3 transmits so that the two brake discs 10 between the pressing section 20th and the stop component 28 are pressed together. The two brake discs form 10 each have a frictional connection with the two associated brake pads 8th , creating a braking torque between the two braking units 4th , 5 is produced.

The transmission component hands over 22nd that on the transmission component 22nd acting braking torque via the counter-toothing 24 to the carrier section 21st . To ensure that the braking torque does not affect the securing means 26th is transmitted, there is the stop component 25th the applied braking torque via the toothed section 29 also to the carrier section 21st continue. Via the interlocking interlocking contour 30th and counter contour 31 are all on the actuating piston 13th Acting braking or drag torques in the piston housing 12th initiated.

To open the braking device 1 must be ensured between the stop component 25th and the actuating piston 13th a spring device 33 attached in the form of a disc spring. The spring device 33 creates one in the opposite axial direction AG directed restoring force F2 , which in an unactuated state of the actuating device 11 , the actuating piston 13th in the opposite axial direction AG pushes back, so that the frictional connection between the brake discs 10 and the brake pads are lifted.

The actuating piston 13th thus takes over in the first embodiment, as in 1 shown several functions. Mainly it provides with its pressing section 20th represents the pressure plate, which when the braking device is actuated 1 the brake pads 8th to the brake discs 10 presses. In addition, the actuating piston takes over 13th all on the fixed brake unit 4th acting drag torques or braking torques and transfers them to the piston housing 12th and the support sleeve 14th .

In the in the 2 The second embodiment shown is used for the end section 32 the support sleeve 14th to form the end stop for the multi-disc brake 3 in the axial direction AR . The end section 32 is here as one at the end of the support sleeve 14th integrally formed radially outwardly directed stop flange which one of the brake pads 8th wearing. In the second embodiment, the actuating piston thus form 13th , especially the support section 21st , and the end section 32 together the inner support 7th .

In this variant is the actuating piston 13th directly with the support sleeve 14th non-rotatably connected. To this end, the carrier section 21st the form-fit contour on its inner circumference 30th and the support sleeve 14th the opposite contour on its outer circumference 31 on, the form-fitting contour 30th and the opposite contour 31 in the direction of rotation around the axis of rotation D. are positively engaged with each other. For example, the form-fit contour 30th as an internal toothing and the counter contour 31 designed as an external toothing.

In the second embodiment, the support sleeve 14th an additional counter-contour on its inner circumference 34 on which to transfer the on the support sleeve 14th acting braking and drag torques on the frame 6th , in particular the wheel axle, is used. For example, the further counter contour 34 be represented by embossing areas, a toothing or the like, the frame 6th , in particular the wheel axle, one corresponding to the further counter contour 34 Has formed form-fitting contour.

The fixed brake unit 4th indicates the safety device 26th on, the securing means 26th in this embodiment example is designed as a locking ring. The security device 26th is at the end of the support sleeve 14th arranged and secures the piston housing 12th in the opposite axial direction AG against losing.

In addition, the fixed brake unit 4th in the second embodiment an adjustment device 35 on, which can be used around a defined air path for the actuating piston 13th adjust. The adjustment device 35 is for example as one with the outside of the piston housing 12th engaged adjusting nut formed.

When the multi-disc brake is actuated 3 by the actuator 11 , becomes the operating force F1 , as already described above, on the actuating piston 13th and thus on the multi-disc brake 3 transferred so that the two brake discs 10 between the pressing section 20th and the end section 32 are pressed together and the braking torque between the two brake units 4th , 5 is produced. The transmission component hands over 22nd that on the transmission component 22nd acting braking torque via the counter-toothing 24 to the carrier section 21st , all on the actuating piston 13th Acting braking or drag torques via the interlocking interlocking contour 30th and counter contour 31 directly into the support sleeve 14th be initiated. In addition, this will affect the end section 32 acting braking torque directly into the support sleeve 14th initiated.

To open the braking device 1 to ensure is between the end section 32 and the actuating piston 13th the spring device 33 attached in the form of a helical compression spring. The spring device 33 generates, as already described, the restoring force F2 , which is the actuating piston 13th to cancel the frictional connection in the opposite axial direction AG pushes back.

The guide sleeve 14th thus takes over in the second embodiment, as in 2 shown several functions. Mainly it represents with the end section 32 the end stop. In addition, the guide sleeve takes over 14th all on the fixed brake unit 4th acting drag torques or braking torques and transfers them to the frame 6th , especially the wheel axle.

A braking device is thus used in the two exemplary embodiments 1 proposed, which can be easily integrated into the wheel hub of the bicycle. The embodiments described result in a particularly compact design of the braking device 1 realized so that it can be integrated into wheel hubs or their drives in a particularly space-saving manner without changing their inner diameter.

List of reference symbols

1

Braking device

2

wheel

3

Multi-disc brake

4th

fixed brake unit

5

rotating brake unit

6

frame

7th

Interior support

8th

Brake pads

9

Balcony

10

Brake discs

11

Actuator

12

Piston housing

13

Actuating piston

14th

Guide sleeve

15th

Printing room

16

Sealing device

17th

Groove sealing ring

18th

Seal carrier

19th

Piston section

20th

Pressing section

21st

Beam section

22nd

Transmission component

23

Spline

24

Mating teeth

25th

Stop component

26th

Securing means

27

Support section

28

Stop section

29

Gear section

30th

Form-fit contour

31

Counter contour

32

End section

33

Spring device

34

further counter contour

35

Adjusting device

AR

axial direction

AG

axial opposite direction

D.

Axis of rotation

F1

Actuation force

F2

Restoring force

RR

radial direction

RG

radial opposite direction

QUOTES INCLUDED IN THE DESCRIPTION

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Patent literature cited

• DE 102010032853 A1 [0003]

Claims (10)

Braking device (1) for an electric bicycle, in particular for a four-wheel pedelec, with a multi-disc brake (3), the multi-disc brake (3) having a fixed brake unit (4) for fixing to a frame (6) of the bicycle and a rotating brake unit ( 5) for fixing to a wheel (2) of the bicycle, the rotating brake unit (5) being rotatable relative to the stationary brake unit (4) about an axis of rotation (D), with an actuating device (11) for actuating the multi-disc brake (3 ), the actuating device (11) having a piston housing (12) and an actuating piston (13) which can be axially displaced in the piston housing (12) for transmitting an actuating force (F1) to the multi-disc brake (3), so that in an actuated state the multi-disc brake ( 3) a frictional connection is formed between the two brake units (4, 5) and a braking torque is transmitted to the wheel (2), characterized in that the rotating brake unit (5) has an outside carrier (9) as well as several brake disks (10) connected non-rotatably to the outer carrier (9) and that the stationary brake unit (4) has an inner carrier (7) and several brake linings (8) connected non-rotatably to the inner carrier (7), at least one of the brake linings (8) is carried by the actuating piston (13). Braking device (1) after Claim 1 , characterized in that the piston housing (12) is designed as an annular housing encircling the axis of rotation (D) and the actuating piston (13) is designed as an annular piston encircling the axis of rotation (D), the annular housing defining an annular pressure chamber (15) which is through the actuating piston (13) is limited in the axial direction. Braking device (1) after Claim 1 or 2 , characterized in that the stationary brake unit (4) has a support sleeve (14) for support on the frame (6), the pressure chamber (15) in a radial direction (RR) through the piston housing (12) and in a radial opposite direction (RG) is limited by the support sleeve (14) and wherein the actuating piston (13) is guided in an axial direction (AR) and in an axial opposite direction (GR) through the support sleeve (14). Braking device (1) after Claim 3 , characterized in that the actuating piston (13) has a form-fitting contour (30) and the support sleeve (14) has a mating contour (31), the form-fitting contour (30) and the mating contour (31) being in engagement with one another so that the braking torque over the Actuating piston (13) is introduced into the support sleeve (14). Braking device (1) according to one of the Claims 1 to 3 , characterized in that the actuating piston (13) has a form-locking contour (30) and the piston housing (12) has a counter-contour (31), the form-locking contour (30) and the counter-contour (31) being in engagement with one another so that the braking torque over the Actuating piston (13) is introduced into the piston housing (12). Braking device (1) according to one of the preceding claims, characterized in that the actuating piston (13) has a radially outwardly directed pressing section (20), the actuating force (F1) in the actuated state of the multi-disc brake (3) via the pressing section (20) ) is transferred to the multi-disc brake (3). Braking device (1) according to one of the preceding claims, characterized in that the actuating piston (13) has a cylindrical support section (21), the support section (21) having a longitudinal toothing (23) on its outer circumference and at least one of the brake linings (8 ) is supported non-rotatably on the carrier section (21) via the longitudinal toothing (23). Braking device (1) after Claim 7 , characterized in that the stationary brake unit (4) has a stop component (25) for forming an end stop in the axial direction, the stop component (25) being non-rotatably supported on the actuating piston (13) via the longitudinal toothing (23). Braking device (1) after Claim 7 , characterized in that the support sleeve (14) has an end section (32) for forming an end stop in the axial direction, the end section (32) being designed as a radially outwardly directed stop flange. Electric bicycle with the braking device (1) according to one of the preceding claims.

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