Hydraulic braking system for a partially muscle-powered bicycle

Description

[0001] The present invention relates to a hydraulic brake arrangement for a bicycle powered at least partially by muscle power and comprises at least one master unit which can be fluidly connected to a slave unit. The master unit has a brake lever and a cylinder housing with a cylinder chamber and a piston unit slidably mounted in the cylinder chamber, and at least one reservoir assembly with a reservoir for a hydraulic fluid. The piston unit and the cylinder housing define a pressure chamber which is connected to the reservoir chamber by means of at least one compensating bore.

[0002] Hydraulic disc brakes for bicycles offer reliable braking even at high speeds, for example, in competitive cycling on racing bikes or mountain bikes. They can also be used to safely brake e-bikes or city bikes. However, due to their hydraulic actuation, these brakes typically require more frequent maintenance. This includes, for example, refilling the hydraulic fluid and bleeding the closed hydraulic circuit. Air bubbles in the hydraulic system can significantly impair the brake's function and must therefore be removed as completely as possible during bleeding.

[0003] During bleeding, both the pressure chamber and other pressurized areas during braking (the so-called high-pressure area) as well as the reservoir and areas not subjected to brake pressure during braking (the so-called low-pressure area) must be vented. Typically, vent openings are provided in both the high-pressure and low-pressure areas for this purpose. This makes the entire bleeding process very complex and time-consuming.

[0004] To simplify venting, the prior art proposes positioning the compensating bore as high as possible in the cylinder chamber. This allows air bubbles from the high-pressure area to flow into the compensating reservoir, provided the compensating bore is not blocked by the piston assembly. Subsequent venting of the compensating reservoir then removes the air bubbles from the high-pressure area. However, a disadvantage is that this requires the cylinder chamber to be positioned in very specific ways, severely limiting the overall design of the sensor unit and making particularly compact implementations difficult.

[0005] To further simplify venting, DE 10 2021 128 118 B3 proposes an additional fluid connection between the pressure chamber and the reservoir. This fluid connection can be interrupted during normal operation and temporarily released in a rapid venting position.

[0006] To make the master cylinder particularly compact, the longitudinal axis of the piston unit can be arranged radially (e.g., almost at a right angle) to the longitudinal axis of the handlebar (so-called "radial piston pumps" or "radial piston brakes"). However, this design means the master cylinder cannot be bled in its intended position on the handlebar. It must be partially detached from the handlebar and pivoted into a very specific position. This position depends heavily on the specific flow paths inside the master cylinder. Therefore, even experts usually need to consult technical instructions to perform a safe bleeding procedure.

[0007] The German patent application DE 20 2006 020 544 U1 also addresses the simplification of bicycle brake bleeding. It proposes equipping the master cylinder assembly with two reservoirs, both located in the low-pressure range. The reservoirs open into a common channel at different heights, which is sealed by a bleed screw. This allows air bubbles to be removed from both reservoirs by loosening the bleed screw. To do this, the master cylinder assembly must be rotated around the handlebar axis until a cover of the master cylinder assembly is facing upwards.

[0008] In contrast, the object of the present invention is to provide an improved hydraulic brake arrangement. In particular, it should enable a particularly safe, reliable, and at the same time simple venting process.

[0009] This problem is solved by a brake arrangement having the features of the claim. 1.A bicycle according to the invention is the subject of claim 15. Preferred embodiments are the subject of the dependent claims. Further advantages and features of the present invention will become apparent from the general description and from the description of the exemplary embodiment.

[0010] The hydraulic brake assembly according to the invention is intended for a bicycle that is at least partially muscle-powered. The brake assembly comprises at least one master unit, which can be fluidically connected to a slave unit (by means of a line assembly). The brake assembly can include at least one slave unit. The brake assembly can include at least one handlebar connection for mounting the master unit on a handlebar. The master unit comprises a brake lever and a cylinder housing with a cylinder chamber. The master unit comprises a piston unit slidably mounted in the cylinder chamber (along a longitudinal axis). The master unit comprises at least one reservoir assembly with at least one reservoir chamber for a hydraulic fluid. The piston unit and the cylinder housing define a pressure chamber (fluidically connectable to the slave unit). The pressure chamber is connected to the reservoir chamber by means of at least one compensating bore.At least one venting duct arrangement is provided. The venting duct arrangement connects a vent opening, which opens into the vicinity of the sensor unit (or to the open air), to both a tank chamber opening and a pressure chamber opening. This allows both the tank chamber and the pressure chamber to be vented simultaneously via the vent opening. Specifically, the venting duct arrangement opens into the pressure chamber at the pressure chamber opening.

[0011] In particular, the handlebar mount defines a mounting axis (for mounting on the handlebar). Specifically, the master cylinder can be mounted around the mounting axis at any angle of rotation (on the handlebar) using the handlebar mount. Specifically, the brake lever is located at a lever-side end of the master cylinder, and the handlebar mount is located at a handlebar-side end of the master cylinder.

[0012] It is preferred that the vent channel arrangement between the pressure chamber outlet and the vent opening, and between the reservoir outlet and the vent opening, rises (continuously) or has a continuous incline, allowing air bubbles from the pressure chamber and the reservoir to rise (by buoyancy) to the vent opening. This is particularly the case when the sensor unit is rotated around the mounting axis such that the lever-side end points downwards and / or the pressure chamber outlet is located in the region of the highest point of the pressure chamber and / or the reservoir outlet is located in the region of the highest point of the reservoir. In particular, the sensor unit is then in its intended mounting position.

[0013] The brake arrangement according to the invention offers many advantages. A significant advantage is the venting channel arrangement. This allows both the high-pressure and low-pressure sections to be vented together or simultaneously via, for example, a single vent opening. The venting channel arrangement can also be advantageously used with encoder units of the radial piston pump type. Overall, the invention enables particularly convenient and safe venting of both the high-pressure and low-pressure sections, which can be reliably performed even by inexperienced users. A particularly advantageous feature is that the air bubbles present in both the low-pressure and high-pressure systems can easily escape into the open air due to buoyancy after the vent opening is opened.

[0014] In particular, the sensor unit is rotated around the mounting axis such that the vent opening is located at the highest point of the venting duct arrangement. Specifically, the sensor unit is rotated around the mounting axis such that the vent opening is positioned higher than both the pressure chamber outlet and the tank chamber outlet.

[0015] Preferably, air bubbles from the pressure chamber and the reservoir can rise to the vent opening at least when the encoder unit is rotated about the mounting axis at an angle between 0° and 90° to the horizontal. In particular, the lever-side end points downwards. Specifically, the encoder unit is inclined downwards at an angle of at most 75°, 60°, or 55° to the horizontal. It is also possible for the encoder unit to be inclined downwards at an angle of at least 50° or 45° to the horizontal. In particular, the encoder unit is inclined downwards at an angle of at least 5°, 7°, 10°, 15°, or 20° to the horizontal.

[0016] Such angles correspond to the mounting positions for master cylinders proven in mountain biking and allow for ergonomic brake lever operation. Therefore, it is particularly advantageous if air bubbles can rise to the bleed port in such mounting positions. This allows the reservoir and pressure chamber to be vented simultaneously directly in the master cylinder's mounting position. Loosening and rotating the master cylinder on the handlebars is thus no longer necessary for bleeding. A proper mounting position is achieved when the master cylinder is rotated around its mounting axis at such an angle to the horizontal. The specifications regarding the rotation angle of the master cylinder relative to the mounting axis refer specifically to a main plane of the master cylinder and / or to a longitudinal axis of the piston unit and / or the cylinder housing.

[0017] In particular, the piston unit is displaceable along a longitudinal axis within the cylinder chamber. Specifically, the piston unit extends with respect to its longitudinal axis between the lever-side end and the handlebar-side end. Specifically, the piston unit is displaceable from the lever-side end towards the handlebar-side end when the brake lever is actuated. Specifically, when the brake lever is actuated, the piston unit is moved towards the handlebar-side end and, in particular, towards the handlebar connection (and thus also towards the handlebar).

[0018] Such a design corresponds in particular to the construction of a radial piston pump. The angle between the longitudinal axis of the piston unit and the horizontal also corresponds in particular to the angle by which the encoder unit is rotated about the mounting axis relative to the horizontal. In the intended mounting position, the longitudinal axis of the piston unit is preferably inclined downwards with the lever-side end pointing downwards.

[0019] Preferably, the venting channel arrangement opens into the pressure chamber in the region of its highest point, and particularly at the highest point of the pressure chamber itself. Specifically, the venting channel arrangement opens into the pressure chamber in such a way that air bubbles (due to buoyancy) can rise from the pressure chamber into the venting channel arrangement. Preferably, the venting channel arrangement opens into the pressure chamber at least in the uppermost quarter or eighth of its volume.

[0020] Preferably, the venting channel assembly opens into the container in the region of its highest point, and particularly at the highest point of the container. Specifically, the venting channel assembly opens into the container in such a way that air bubbles (due to buoyancy) can rise from the container into the venting channel assembly. Preferably, the venting channel assembly opens into the container at least in the uppermost quarter or eighth of its volume.

[0021] This has the particular advantage that air bubbles from the reservoir and pressure chamber can rise to the vent due to buoyancy when the sensor unit is mounted on the handlebars and ready for operation. To vent the system, nothing more needs to be done than opening the vent.

[0022] The information provided within the scope of the present invention regarding the highest points and the orientation of the venting channel arrangement relates in particular to a intended mounting position of the sensor unit on the handlebars of a bicycle. An intended mounting position exists, in particular, at least when the longitudinal axis of the pressure chamber and / or the reservoir chamber and / or the piston unit and / or a side channel of the venting channel arrangement runs horizontally and / or when the longitudinal axis of a main channel of the venting channel arrangement runs vertically. Preferably, the intended mounting position also exists when such longitudinal axes deviate from the horizontal or vertical within a certain angular range. Such angular ranges are defined below.A particularly preferred mounting position is one in which the longitudinal axis of the pressure chamber and / or the reservoir and / or the piston unit is inclined obliquely downwards. The pressure chamber and the reservoir are arranged relative to each other such that their respective highest points lie at the corresponding opening of the venting channel assembly when the sensor unit is in its intended mounting position. Within the scope of the present invention, the highest point can also be part of a highest line or highest surface.

[0023] In particular, the vent channel arrangement can be closed, at least partially, by means of a releasable closure element. Preferably, the closure element can be inserted into the vent channel arrangement in such a way that the pressure chamber is sealed against the reservoir and also against the vent opening (or the environment), and preferably the reservoir is also sealed against the environment. Within the scope of the present invention, specifications regarding tightness refer in particular to the pressure conditions to be expected during the intended operation of the sensor unit. In particular, the closure element seals the vent opening against the environment.

[0024] In an advantageous embodiment, it is provided that by releasing the closure element, the pressure chamber is connected to the container chamber, and that the vent opening is preferably also opened in the process. In particular, the pressure chamber is first connected to the container chamber. Subsequently or simultaneously, the vent opening is opened and / or the pressure chamber and the container chamber are connected to the environment. Specifically, releasing the closure element includes at least partially removing (unscrewing) it from the vent channel assembly.

[0025] The closure element is preferably designed as a screw or comprises at least one such screw. In particular, the closure element is formed in one piece. In particular, the closure element has at least a section of an external thread which corresponds to an internal thread of the vent channel assembly.

[0026] In an advantageous embodiment, the closure element is equipped with a blind hole extending in the axial direction. In particular, the blind hole opens into the environment at an upper end of the closure element. Specifically, the blind hole can be closed from the environment (to the outside) by means of a blind hole sealing screw. The blind hole sealing screw preferably has at least one sealing element at its upper end.

[0027] In particular, the blind hole plug screw can be screwed into the sealing element at one upper end. In particular, the sealing element and the blind hole plug screw are arranged coaxially with each other. In particular, the main channel and the blind hole are coaxial with each other. In particular, the sealing element has an internal thread in the area of ​​the blind hole, which corresponds to an external thread of the blind hole plug screw. In particular, the collar section is designed for the insertion of a screw tool. In particular, the blind hole plug screw has a projection for the insertion of a screw tool.

[0028] In particular, the closure element is equipped with a radially extending transverse channel. Specifically, the transverse channel extends radially outward from the blind hole (to an outer surface of the closure element). Specifically, the transverse channel opens (on an outer surface of the closure element) into the vent channel arrangement and preferably into the main channel (when the closure element is inserted into the vent channel arrangement as intended). Specifically, the transverse channel opens below the threaded section and / or above the sealing surface of the closure element.

[0029] In particular, the blind hole and especially the transverse channel are not in flow communication with the pressure chamber when the sealing element is inserted into the vent channel assembly as intended. In particular, the blind hole and especially the transverse channel are in flow communication with the tank chamber and / or the side channel when the sealing element is inserted into the vent channel assembly as intended. In particular, the blind hole sealing screw seals the blind hole against the environment. away. In particular, the blind hole sealing screw also seals the container space (and the side channel and the transverse channel) from the environment.

[0030] The previously described modification has the advantage that, with the sealing element installed as intended, only the blind hole screw needs to be loosened to vent the reservoir or fill it with hydraulic fluid. The pressure chamber remains sealed. This allows for the advantageous "simultaneous venting" of both the pressure chamber and the reservoir, and also enables the reservoir to be vented or filled only if required.

[0031] The brake assembly can include at least one tubular filling adapter with two ends. In particular, the filling adapter can be screwed into the vent channel assembly (preferably the main channel) at its first end in place of the sealing element. The first end preferably seals the pressure chamber (when screwed in as intended). In particular, the first end corresponds to the sealing seat. In particular, the filling adapter has a blind hole that opens at a second end. In particular, the filling adapter has at least one radially extending filling channel that extends radially outwards from the blind hole. In particular, the second end of the filling adapter can be connected to a hose and / or container for supplying hydraulic fluid. In particular, the second end is fluidically connected to the container chamber via the blind hole and the filling channel when the filling adapter is screwed in as intended.This allows the reservoir to be filled with hydraulic fluid and, if necessary, vented at the same time, while the pressure chamber remains closed.

[0032] It is advantageous and preferred that the venting channel arrangement comprises at least two channel arms. In particular, at least one (first) channel arm opens into the pressure chamber. In particular, at least one (second) channel arm opens into the tank chamber. In particular, at least one of the channel arms, especially the first channel arm, opens into the environment surrounding the sensor unit at the vent opening. In particular, at least one of the channel arms, especially the second channel arm, opens into at least one other channel arm, especially the first channel arm. It is also possible that at least two channel arms, especially the first and the second channel arm, open into the environment at the vent opening. It is also possible that the first channel arm opens into the second channel arm. In that case, preferably at least the second channel arm opens into the environment at the vent opening.

[0033] In an advantageous and preferred embodiment, the venting channel arrangement comprises at least one main channel and at least one side channel. In particular, the main channel extends from the pressure chamber to the vent opening. In particular, the side channel extends from the main channel to the reservoir. It is also possible that the main channel extends from the reservoir to the vent opening and that the side channel extends from the main channel to the pressure chamber. Preferably, the side channel branches off from the main channel. Preferably, the side channel connects the reservoir to the main channel. In particular, the side channel has a smaller cross-sectional area than the main channel. In particular, the side channel branches off from the main channel between the vent opening and the pressure chamber.

[0034] In an advantageous embodiment, the main channel has a steeper gradient than the side channel. In particular, the main channel runs at an angle between 0° and 65° or between 0° and 45°, and preferably between 0° and 35° (25°), to the vertical. In particular, the side channel runs at an angle between 0° and 65° or between 0° and 45°, and preferably between 0° and 35° (25°), to the horizontal, upwards or downwards towards the main channel or vent opening. The side channel runs transversely and, for example, at right angles (90° ± 25° or 90° ± 15°) to the main channel. The side channel runs obliquely upwards from the reservoir chamber towards the main channel. The side channel can run parallel to the longitudinal axis of the piston assembly and / or the pressure chamber. It is possible for the side channel to have a steeper gradient than the main channel.

[0035] In particular, a longitudinal axis of the main channel runs at an angle of 120° ± 45° and preferably 120° ± 35° to a longitudinal axis of the piston unit and / or the pressure chamber and / or the reservoir. The angle can be, for example, 120° ± 10° or 90° ± 10°. This enables particularly reliable venting and simultaneously allows for a wide range of mounting positions in which optimal venting can be achieved. For example, particularly good venting can be achieved with such designs when the sensor unit is mounted on the handlebar at a downward angle of 25° ± 15° to the horizontal (with respect to the longitudinal axis of the piston unit or to a main plane of the sensor unit).

[0036] It is advantageous and preferred that the main channel and / or the side channel have a straight course. In particular, the main channel and / or the side channel can be produced or are produced by means of a bore or a comparable method. In particular, the main channel and / or the side channel have a cylindrical channel cross-section, at least in sections. Other cross-sectional geometries are also possible. In particular, the main channel comprises two channel cross-sections, each with different diameters. In particular, the main channel is conical in sections (especially in the area of ​​the transition from one channel cross-section to the other). This provides the sealing surface described below.

[0037] In a particularly preferred and advantageous embodiment, the closure element has a sealing surface, preferably a conical sealing surface, at a lower end facing the pressure chamber or the container chamber. In particular, the sealing surface corresponds to a sealing seat. Specifically, the sealing seat is provided by a cross-sectional constriction in the main channel. In particular, the sealing seat is part of a housing body in which the vent channel arrangement is formed. In particular, the sealing seat is conical. Other suitable geometries of the sealing surface and / or sealing seat, as well as sealing types, e.g., rubber seals, O-rings, or the like, are also possible.

[0038] In particular, the sealing surface rests tightly against the sealing seat, so that the closure element seals the pressure chamber from the container chamber. Specifically, the pressure chamber is sealed from the vent channel assembly solely by the sealing surface and the sealing seat. Specifically, the sealing seat and the sealing surface rest tightly against each other because the closure element is inserted into the vent channel assembly as intended and preferably screwed in. In particular, the seal between the sealing seat and the sealing surface is pressure-resistant.

[0039] The closure element preferably has a collar section at its upper end, which faces the vent opening. In particular, at least one sealing element is arranged between the collar section and a housing body in which the vent channel assembly is formed. This seals the vent channel assembly from the environment. Specifically, the sealing element is pressed between the closure element and the housing body so that the inserted (screwed-in) closure element seals the container space from the vent opening and the environment. In particular, the sealing element is designed as a sealing ring. Specifically, the collar section projects radially beyond the vent opening. Specifically, the collar section is provided by a screw head.

[0040] The closure element has, in particular, at least one threaded section for screwing into the vent channel assembly and preferably into the main channel. Specifically, the threaded section is arranged between the side channel and the vent opening. Specifically, the threaded section is not arranged between the side channel and the pressure chamber. Such arrangements of the threaded section are particularly necessary when the closure element is screwed into the vent channel assembly (so that the pressure chamber is sealed from the reservoir). This allows hydraulic fluid (or air) to escape into the reservoir via the side channel when the closure element is screwed in. However, hydraulic fluid (or air) can also preferably escape into the reservoir via the equalization bore.

[0041] In particular, the main channel has an internal thread section corresponding to the threaded section. In particular, the side channel branches off from the main channel between the sealing seat and the internal thread section. In particular, the side channel opens into the main channel outside the internal thread section. In particular, the side channel opens into the main channel below the internal thread section and above the sealing seat.

[0042] In particular, at least a gap is formed in the radial direction, at least partially, between the sealing element and the wall of the main channel, which extends below the side channel and / or below the internal thread section (when the sealing element is inserted). Specifically, hydraulic fluid can escape from the main channel through the side channel into the reservoir via this gap when the sealing element is inserted.

[0043] It is preferred and advantageous that the entire side channel extends above a highest point of the pressure chamber. In particular, the entire main channel also extends above a highest point of the pressure chamber. Specifically, the side channel extends from its opening into the vessel chamber at least horizontally or with an upward slope towards the main channel and / or the vent opening. In particular, neither the side channel nor the main channel has any downward slopes where air bubbles could become trapped. Specifically, the entire side channel extends above a highest point of the vessel chamber.

[0044] It is advantageous and preferred that the opening of the side channel into the reservoir and / or the opening of the side channel into the main channel be located higher than the opening of the main channel into the pressure chamber, and in particular higher than the highest point of the pressure chamber. It is possible for the opening of the side channel into the reservoir to be located lower or higher than the opening of the side channel into the main channel. It is also possible for both openings of the side channel to be at the same level. The course of the side channel depends, in particular, on the accessibility of the reservoir during the manufacturing of the side channel. For example, sufficient space must be available to position a cutting tool in the reservoir at the desired angle.

[0045] The sealing element is preferably arranged only in the main channel if it seals the pressure chamber against the container space and also against the vent opening, and in particular also the container space against the vent opening. In particular, the sealing element can be arranged only in the main channel.

[0046] Preferably, the reservoir is arranged at least partially above the pressure chamber. In particular, the reservoir is located higher than the highest point of the pressure chamber. It is also possible that the reservoir is arranged at least partially adjacent to the pressure chamber.

[0047] In particular, the vent opening represents a highest point of the vent channel arrangement and preferably of the entire hydraulic circuit. Specifically, the vent opening is positioned higher than a highest point of the reservoir and / or a highest point of the pressure chamber. Specifically, the vent opening is located higher than the side channel. Specifically, the closure element is located higher than or at the same height as the vent opening when it is properly installed in the vent channel arrangement.

[0048] The brake assembly can include at least one handlebar. In particular, the handlebar connection and the piston unit are arranged relative to each other such that the piston unit projects radially from the handlebar (with respect to the longitudinal axis of the handlebar) when the master cylinder is in its intended mounting position. The longitudinal axis of the piston unit can project at an angle of 90° to the longitudinal axis of the handlebar or at an angle of less than 90° towards the handlebar. Specifically, the angle can be 25° to 90°, 35° to 90°, or 45° to 90°. Angles of 50° to 90° are also possible.

[0049] In such arrangements, the master cylinder is also referred to as a radial piston pump in bicycle circles. The invention presented here can be used particularly advantageously for bleeding brakes in combination with such a design. Specifically, the piston unit does not run parallel to the longitudinal axis of the handlebars with respect to its longitudinal axis. In particular, the longitudinal axis of the piston unit runs at an angle between 45° and 90° to a longitudinal axis of the brake lever. Specifically, an imaginary extension of the longitudinal axis of the piston unit and / or the reservoir intersects the brake lever (especially between a distal end of the brake lever and a brake lever pivot axis). Specifically, when the brake lever is actuated, the piston unit is moved (essentially) in the same direction as the brake lever. Specifically, the piston unit is pushed towards the handlebars by the actuation of the brake lever.

[0050] In the intended mounting position, the longitudinal axis of the piston unit and / or the pressure chamber is preferably inclined downwards to the horizontal. In particular, the longitudinal axis of the piston unit and / or the pressure chamber is inclined downwards at an angle between 0° and 90° to the horizontal. In a further embodiment, the brake assembly can include at least one linkage on which the master cylinder is mounted at such a downward angle.

[0051] In particular, the longitudinal axis of the piston unit and / or the pressure chamber is inclined downwards by a maximum of 75° or a maximum of 60° to the horizontal. It is possible and preferred that the longitudinal axis of the piston unit and / or the pressure chamber is inclined downwards by a maximum of 45°, a maximum of 35°, or a maximum of 30° to the horizontal. In the intended assembly position, the longitudinal axis of the piston unit and / or the pressure chamber can also be parallel to the horizontal. Such angles enable particularly reliable venting via the venting channel arrangement.

[0052] In certain designs, the longitudinal axis of the piston unit and / or the pressure chamber can be inclined upwards to the horizontal in the intended mounting position. In such cases, the pressure chamber and / or the reservoir are designed accordingly with respect to their highest point. Specifically, the longitudinal axis of the piston unit is inclined upwards by a maximum of 30°, 25°, or 20° to the horizontal. An upward inclination of a maximum of 15°, 10°, or 5° to the horizontal is also possible.

[0053] In particular, the longitudinal axis of the piston unit runs parallel to a main plane of the master cylinder. In particular, a longitudinal axis of the brake lever runs parallel to a main plane of the master cylinder. In particular, a main plane of the master cylinder is inclined to the horizontal as previously described for the longitudinal axis of the piston unit. In such embodiments, the term "longitudinal axis of the piston unit (and / or pressure chamber)" can be used synonymously with the term "main plane of the master cylinder."

[0054] In its intended mounting position, the master cylinder is ready to brake the bicycle while riding. Preferably, the master cylinder is also in a position suitable for bleeding. Specifically, the intended mounting position also corresponds to the intended bleeding position. In the bleeding position, air bubbles from the pressure chamber and air bubbles from the reservoir can rise through the vent channel to the vent opening. This allows the master cylinder to be bled in its intended mounting position on the handlebars. It is not necessary to move it to a different mounting position specifically designed for bleeding. The master cylinder is specifically designed for use on straight handlebars or mountain bike handlebars and is not intended for use on drop handlebars.

[0055] The bicycle according to the invention comprises a hydraulic brake assembly as described herein. In particular, the at least one master cylinder is mounted in a suitable mounting position on the handlebar of the bicycle. The bicycle specifically comprises at least one handlebar. In particular, the mounting axis corresponds to a longitudinal axis of the handlebar at the point on the handlebar where the master cylinder is mounted. The bicycle is specifically designed as a mountain bike. The handlebar is specifically a so-called straight handlebar and preferably a mountain bike handlebar. The handlebar can be designed as a flat bar or a rise bar. The handlebar is specifically not a racing bike handlebar.

[0056] In particular, a connection opening for coupling a piping system is arranged lower than the vent channel assembly. Specifically, the connection opening serves to connect the transmitter unit to the receiver unit. Specifically, the hydraulic fluid in the pressure chamber communicates with the hydraulic fluid in the piping system or the receiver unit via this connection opening. Specifically, the cylinder housing has a connection opening at a receiver-side end for coupling a piping system. Specifically, the hydraulic fluid in the pressure chamber communicates with the hydraulic fluid in the piping system or the receiver unit via this connection opening.

[0057] In particular, the vent channel arrangement is located between the handlebar connection and the reservoir and / or the pressure chamber. Specifically, the vent channel arrangement is formed in a housing wall that is integrally formed with a portion of the handlebar connection and / or with the cylinder housing and / or with a wall of the reservoir. In particular, the vent channel arrangement is formed in a base body of the encoder unit. Specifically, the handlebar connection is at least partially integrally formed with the base body. The base body is preferably formed in one piece. Specifically, the cylinder housing is an integral part of the base body. Specifically, the vent channel arrangement extends at least partially, and preferably completely, within the base body.

[0058] In particular, the vent opening also serves as a filler opening for adding hydraulic fluid to the reservoir or hydraulic circuit (so-called comfort venting). Specifically, venting is possible without removing the diaphragm unit. However, the expansion tank assembly can also have at least one separate filler opening for adding hydraulic fluid to the reservoir.

[0059] In particular, the venting duct arrangement comprises at least three outlets. Specifically, a first outlet (high-pressure outlet) is located in the region of the highest point of the pressure chamber. Specifically, a second outlet (low-pressure outlet) is located in the region of the highest point of the tank chamber. Specifically, a third outlet is located at the vent opening, so that the venting duct arrangement opens there into the vicinity of the sensor unit or into the open air.

[0060] In particular, the sealing element provides at least two sealing levels. With a first sealing level, the sealing element seals the pressure chamber against the container space and against the vent opening or the environment. With a second sealing level, the sealing element preferably seals the vent opening or the vent channel assembly against the environment. In particular, the sealing surface and the sealing seat together provide the first sealing level. In particular, the sealing body, the collar section, and the housing body together provide the second sealing level.

[0061] In particular, the compensating bore is located in the cylinder housing. Specifically, the compensating bore connects the pressure chamber to the reservoir when the piston unit is in a rest position or when the encoder unit is not actuated. When the encoder unit is actuated, the piston unit seals the pressure chamber from the fluid chamber, allowing the pressure chamber to be pressurized. In other words, the compensating bore can be closed by the piston unit when the encoder unit is actuated. Subsequent movement of the piston unit leads to a pressure build-up in the pressure chamber and a reduction in its volume.

[0062] In particular, the pressure chamber forms part of the cylinder chamber. Specifically, when the master cylinder is actuated, brake pressure is present in the pressure chamber. The pressure chamber therefore belongs to the high-pressure section of the hydraulic circuit. When the master cylinder is actuated, i.e., when the brakes are applied, low pressure, or atmospheric pressure, prevails in the reservoir. The reservoir therefore belongs to the low-pressure section of the hydraulic circuit. The master cylinder is actuated, in particular, by (manually) moving or actuating the brake lever. The piston assembly is pushed into the pressure chamber, specifically by pulling the brake lever. Specifically, the piston assembly is not pulled into the pressure chamber.

[0063] The compensating bore can comprise one or more individual bores or be provided by several individual bores. When the compensating bore is referred to within the scope of the present invention, this specifically means all individual bores. The compensating bore can also be called a sniffing bore. In particular, the compensating bore or a bore is understood to be a channel-like through-opening, which does not necessarily have to be created by drilling. A part of the cylinder chamber located outside the pressure chamber can be connected to the container chamber by means of at least one lubrication bore. In particular, the compensating bore and / or the lubrication bore extend deeper than the opening of the venting channel arrangement into the container chamber. In particular, the opening of the compensating bore and / or the lubrication bore is located deeper than the opening of the venting channel arrangement into the pressure chamber or cylinder chamber.

[0064] In particular, the venting channel arrangement connects the pressure chamber and the reservoir chamber (in addition to the equalization bore) to each other and also to the vent opening. The vent opening serves primarily to vent a hydraulic circuit. Specifically, the transmitter unit has no other intended venting options besides the venting channel arrangement. The receiver unit may have at least one vent opening.

[0065] The highest point refers in particular to a location where air bubbles can collect in the reservoir or pressure chamber due to buoyancy. The reservoir is bounded in particular by walls and / or at least one lid and / or at least one membrane unit. The highest point of the reservoir lies in particular within the space enclosed by the walls and / or the lid and / or the membrane unit. The highest point of the reservoir does not lie outside the walls and / or the lid and / or the membrane unit. If the expansion tank is equipped with a membrane unit, the membrane unit does not have any protrusions that could shift the highest point of the reservoir to a location other than the outlet of the venting duct assembly.

[0066] Further advantages and features of the present invention will become apparent from the exemplary embodiments, which are explained below with reference to the accompanying figures.

[0067] The figures show: Fig. 1 a schematic representation of a mountain bike with a brake arrangement according to the application; Fig. 2 a schematic representation of a brake arrangement according to the application on a handlebar of a bicycle in a top view; Fig. 3 a schematic detail representation of the brake arrangement in a sectional side view; and Figs. 4-6 schematic detail representations of variants of the brake arrangement.

[0068] In the Figure 1Figure 100 depicts a bicycle 100 designed as a mountain bike, equipped with a hydraulic brake arrangement 1 as specified in the application. The bicycle 100 has a front wheel 102 and a rear wheel 103, each of which can be braked individually via a separate hydraulic circuit 11. Each hydraulic circuit 11 comprises a master unit 10 and a receiver unit 200.

[0069] The bicycle 100 has a frame 104, handlebars 101 with grips 114, a saddle 107, a fork or suspension fork 105, and optionally a rear shock absorber 106. A crankset 112 with pedals provides propulsion. An electric assist motor may be attached to the crankset 112 and / or the wheels 102, 103. The wheels 102, 103 each have a rim 110, which is connected to a hub via spokes 109. The hubs of the wheels 102, 103 can each be attached to the frame 104 or the fork 105 via a clamping system 113 (for example, a thru-axle or a quick-release skewer).

[0070] A hydraulic disc brake slave unit 200 is attached to both the frame 104 and the fork 105. The slave unit 200 is connected to the corresponding master unit 10 via a hose assembly 201 (not shown here), thus forming a closed hydraulic circuit 11. The master units 10 of a bicycle 100 are mounted at opposite ends of the handlebar 101 and each has a brake lever 2 that can be operated by the fingers.

[0071] The brake arrangement 1 as registered is now described with reference to the Figures 2 and 3 described in more detail.

[0072] The master unit 10 is attached to the handlebar 101 of a bicycle 100 in its intended mounting position by means of a handlebar mount 8. The handlebar mount 8 is an integral part of a base body 20 and, together with one or more connection sections (here, for example, designed as a clamp that can be screwed onto the handlebar mount 8), surrounds the handlebar 101. The handlebar mount 8 defines a mounting axis 18, which here also corresponds to the longitudinal axis of the handlebar 101. The master unit 10 can be rotated about the mounting axis 18 to align the brake lever 2 as ergonomically as possible. The master unit is then fixed at the desired angle of rotation by means of the handlebar mount 8, for example, by tightening the clamp. The handlebar mount 8 defines a handlebar-side end 28 of the master unit 10.

[0073] The encoder unit 10 comprises a cylinder housing 3 with a cylinder chamber 13 and a piston unit 4 slidably mounted in the cylinder chamber 13 (in the Figure 2 (not visible inside). The cylinder housing 3 is also an integral part of the base body 20. The cylinder housing 3 has a connection opening 93 for coupling a line assembly 201.

[0074] A brake lever 2 is mounted on a lever receptacle 22, which is also integrated into the base body 20, so that it can pivot about a brake lever pivot axis 12. The brake lever 2 is coupled to the piston unit 4 by means of an actuating mechanism with a connecting rod 17. The brake lever 2 defines a lever-side end 32 of the master cylinder unit 10.

[0075] Pulling the brake lever 2 moves the piston assembly 4 within the cylinder chamber 13. The piston assembly 4 comprises a piston 14 and a piston sealing assembly, which here is provided by a primary seal 54 and a secondary seal 64. The piston assembly 4 is in a rest position here, as the master cylinder 10 is not actuated.

[0076] A reservoir assembly 5 with a reservoir chamber 15 and a lid 85 is provided for storing hydraulic fluid. A biodegradable oil is specified as the hydraulic fluid. Alternatively, a mineral oil or brake fluid (DOT) can also be used. The reservoir chamber 15 is bounded by a reservoir basin 75 and a membrane unit 6. The reservoir basin 75 is an integral part of the base body 20.

[0077] The membrane unit 6 extends between the reservoir chamber 15 and the lid 85 and seals the reservoir chamber 15 against an air space 45 located below the lid 85. The volume of the reservoir chamber 15 can be adjusted to the respective oil level by deforming the membrane unit 6. The air space 45 then becomes correspondingly smaller or larger. The air space 45 is connected to the environment via a vent to allow pressure equalization.

[0078] The piston unit 4 and the cylinder housing 3 define a pressure chamber 131, which forms part of the cylinder chamber 13. The pressure chamber 131 is connected to the reservoir chamber 15 via a compensating bore 53 formed in the cylinder housing 3. The compensating bore 53, shown here by way of example, consists of a total of three individual bores.

[0079] The compensating bore 53 is exposed when the piston unit 4 is in its rest position. When the master unit 10 is actuated, the piston unit 4, with its primary seal 54, seals the pressure chamber 131 against the reservoir chamber 15. This allows the pressure chamber 131 to be pressurized when the brake lever 2 is pulled further. The slave unit 200 is then actuated, and, for example, a piston of a disc brake is extended.

[0080] In addition to the compensating bore 53, the cylinder chamber 13 is connected to the reservoir chamber 15 via a lubrication bore 63. The lubrication bore 63 opens into a part of the cylinder chamber 13 located outside the pressure chamber 131. Hydraulic fluid can pass through the lubrication bore 63 behind the primary seal 54 to lubricate the piston assembly 4. Furthermore, the hydraulic fluid can flow back into the reservoir chamber 15 via the lubrication bore 63 once it has passed behind the primary seal 54. The lubrication bore 63 is sealed by the secondary seal 64.

[0081] As in the Figure 2As can be clearly seen, the sensor unit 10 is designed here as a so-called "radial piston pump" and extends radially from the handlebar 101. The longitudinal axis 24 of the piston unit 4 (shown with a dashed line) intersects (in an imaginary extension) the mounting axis 18 or the longitudinal axis of the handlebar 101 at an angle 59 of, for example, 55° + / - 10°. This makes the sensor unit 10 particularly compact.

[0082] In order to enable particularly convenient and reliable venting (despite its radial piston pump design), the sensor unit 10 is equipped with a special venting channel arrangement 9 (in the Figure 2(not visible inside). The venting duct assembly 9 opens into the environment at a vent opening 65 and connects the vent opening 65 to both the container chamber 15 and the pressure chamber 131. This allows both the container chamber 15 (low-pressure area) and the pressure chamber 131 (high-pressure area) to be vented simultaneously from the vent opening 65.

[0083] The venting channel assembly 9 opens into the pressure chamber 131 at its highest point via a pressure chamber opening 89. Additionally, the venting channel assembly 9 opens into the reservoir 15 at its highest point via a reservoir opening 79. This allows air bubbles from the pressure chamber and reservoir 15 to rise into the venting channel assembly 9 and escape into the environment via the vent opening 65. The rising of the air bubbles is particularly reliable when the sensor unit 10 is in its intended mounting position on the handlebar 101.

[0084] An example of a suitable mounting position is shown in the Figure 3As shown, the longitudinal axis 24 of the piston unit 4 (shown with a dashed line) is inclined downwards at a defined angle to the horizontal. For example, the longitudinal axis 24 of the piston unit 4 is mounted on the handlebar 101 at an angle of 30° + / - 10° downwards to the horizontal. The exact angle relative to the mounting axis 18 or to the handlebar 101 is determined, for example, by the fact that the extended index finger of a person sitting on the bicycle 100, touching the brake lever 2, runs in a straight line with the forearm. The longitudinal axis 24 of the piston unit 4 also corresponds here to a main plane of the master cylinder 10, so that the master cylinder 10 is also mounted on the handlebar 101 at such a downward angle to the horizontal with respect to its main plane. However, with the vent channel arrangement 9 shown here, venting can also be carried out reliably and safely in other intended mounting positions.

[0085] The venting duct arrangement 9 comprises two duct arms 29a and 39a. A first duct arm 29a opens into the pressure chamber 131 and into the environment at the vent opening 65. A second duct arm 39a opens into the tank chamber 15 and into the first duct arm 29a. The first duct arm 29a is designed as a main duct 29. The second duct arm 39a is designed as a side duct 39, branching off from the main duct 29. The main duct 29 and the side duct 39 have a straight course and can therefore each be constructed by means of a borehole or a comparable method.

[0086] The main channel 29 runs at a steeper gradient than the side channel 39. For example, the longitudinal axis of the main channel 29 (in the Figure 4(shown with a dashed line) has a substantially vertical course. The longitudinal axis of the main channel 29 runs, for example, at an angle 69 of 120° + / - 15° to the longitudinal axis 24 of the piston unit 4. Since the longitudinal axis 24 of the piston unit 4 also corresponds to the main plane of the encoder unit 10, the longitudinal axis of the main channel 29 thus also runs at such an angle to the main plane of the encoder unit 10. The longitudinal axis of the side channel 39 has a substantially horizontal course.

[0087] The outlets of the vent channel assembly 9 into the pressure chamber 131 and into the reservoir chamber 15 are located higher than the compensating bore 53 and the lubrication bore 63. Furthermore, the entire side channel 39 runs higher than the highest point of the pressure chamber 131. In the intended installation position, the vent opening 65 represents the highest point of the vent channel assembly 9 and also of the entire hydraulic circuit 11. As shown in the Figure 3As can be clearly seen, the container chamber 15 is located above the pressure chamber 131, so that the compensating bore 53 and the lubrication bore 63 also run upwards and essentially vertically.

[0088] The vent channel assembly 9 runs between the handlebar connection 8 and the reservoir 15 within a housing body 49. The housing body 49 is provided here by the base body 20, so that the vent channel assembly 9 is also an integral part of the base body 20. The vent channel assembly 9 is manufactured, for example, by incorporating recesses and, in particular, bores into the base body 20.

[0089] A releasable sealing element 19 is provided for pressure-resistant closure of the vent channel assembly 9. This element is designed here as a screw 19a with an (external) threaded section 190. At its lower end, the sealing element 19 is equipped with a conical sealing surface 191. At its upper end, a collar section 193 is provided, which corresponds, for example, to the head of the screw 19a. The screw 19a has a receptacle for a screwing tool at its upper end. The sealing element 19 extends only into the main channel 29.

[0090] The sealing element 19 can be screwed in here so that the pressure chamber 131 is sealed against the reservoir chamber 15 and also against the vent opening 65. For this purpose, the sealing surface 191 rests against a corresponding sealing seat 192 of the main channel 120. To seal the vent opening 65 against the vent channel assembly 9, a sealing element 194 and, for example, a sealing ring are arranged between the collar section 193 and the housing body 49. By loosening the sealing element 19, the pressure chamber 131 is connected to the reservoir chamber 15. Subsequently, the vent opening 65 is opened.

[0091] The sealing seat 192 is provided here by a cross-sectional constriction 29b of the main channel 29. Below the cross-sectional constriction 29b, the main channel 29 has a channel cross-section whose diameter is smaller than the diameter of the channel cross-section above the cross-sectional constriction 29b.

[0092] The threaded section 190 of the sealing element 19 extends only between the side channel 39 and the vent opening 65. This allows hydraulic fluid to escape from the main channel 29 into the reservoir 15 via the side channel 39 when the sealing element 19 is screwed in. Hydraulic fluid and air can also escape into the reservoir 15 via the equalization bore 53. This allows the vent channel assembly 9 to be filled with hydraulic fluid before the sealing element 15 is inserted. Filling the assembly ensures that no air remains in the vent channel assembly 9.

[0093] In the invention shown here, it is no longer necessary to pivot the sensor unit 10 from its intended mounting position to a different, specific position for venting. The mounting position also corresponds to the venting position. In other words, with the invention, the sensor unit 10 can be completely and safely vented in its normal operating position on the handlebar 101. Furthermore, a so-called convenience venting is possible, thus preventing oil contamination. For example, extremely quick venting can be carried out on the go or in the field, requiring only the unscrewing of the sealing element 15.

[0094] The Figure 4 shows a variant of the one related to Figure 3Described brake arrangement 1. The master cylinder 10 is also attached here by means of a handlebar connection 8 to a handlebar 101 (not shown) in a designated mounting position with the lever-side end 32 angled downwards. The longitudinal axis of the main channel 29 runs, for example, at an angle 69 of 90° + / - 15° to the longitudinal axis 24 of the piston unit 4. In addition, the side channel 39 runs parallel to the longitudinal axis 24 of the piston unit 4. The reservoir assembly 5 is equipped here with a diaphragm unit 6, which closes off the reservoir chamber 15 at the top such that the highest point of the reservoir chamber 15 is located at the reservoir chamber opening 79.

[0095] The Figure 5 The transmitter unit 10 shows Figure 4, which here is equipped with a particularly advantageous closure element 19 with a blind hole 195 and a transverse channel 196. The blind hole 195 is designed here in two stages, resulting in two diameter ranges (with the larger diameter range having the internal thread).

[0096] The blind hole 195 is sealed from the surroundings by means of a blind hole sealing screw 197. The blind hole sealing screw 197 has a recess 198 for a tool and, for example, an Allen key. The transverse channel 196 is connected to the reservoir 15 via the side channel 39. When the reservoir 15 is to be vented or filled with hydraulic fluid, only the blind hole sealing screw 197 is loosened, while the sealing element 19 continues to seal the pressure chamber 131.

[0097] In the Figure 6 is the transmitter unit 10 of the Figure 4As shown, the sealing element 19 has been removed and temporarily replaced by a tubular filling adapter 202 with two ends 203, 204. When the filling adapter 202 is screwed in as shown, the first end 203 seals the pressure chamber 131. The reservoir 15 can then be filled with hydraulic fluid and simultaneously vented via a blind hole 205 and a radial filling channel 206, while the pressure chamber 131 remains sealed. A hose, for example, can be connected to the second end 204. Reference symbol list:

[0098] 1 Brake arrangement 93 Connection opening 2 brake lever 100 Bicycle 3 Cylinder housing 101 handlebars 4 Piston unit 102 wheel, front wheel 5 Expansion tank system 103 wheel, rear wheel 104 Frame 6 Membrane unit 105 Fork, suspension fork 8 handlebar connection 106 rear wheel damper 9 Ventilation duct arrangement 107 saddle 10 Transmitter unit 109 spoke 11 hydraulic circuit 110 rim 12 brake lever pivot axis 112 crank 13 Cylinder space 113 clamping system 14 Pistons 114 Handle 15 Container space 131 Printing room 17 connecting rod 190 Threaded section 18 Mounting axis 191 Sealing surface 19 Locking element 192 sealing seat 19a screw 193 collar section 20 base body 194 Sealing body 22 Lever mount 195 Dead end 24 Longitudinal axis 196 Cross channel 28 End 197 Blind hole screw 29 Main channel 198 Approach 29a Canal arm 200 receiver unit 29b Cross-sectional narrowing 201 Management system 32 End 202 Filling adapter 39 Side channel 203 End 39a Canal arm 204 End 45 airspace 205 Dead end 49 Housing body 206 Filling channel 53 Compensating bore 54 Primary seal 59 angle 63 lubrication hole 64 Secondary seal 65 vent 69 angle 75 Container tub 79 Tank chamber opening 85 Lid 89 Pressure chamber mouth

Claims

1. A hydraulic brake arrangement (1) for an at least partially muscle-powered bicycle (100), comprising at least one master unit (10) provided for fluid connection with a slave unit (200) and for mounting to a handlebar (101) by means of at least one handlebar mount (8), wherein the master unit (10) comprises a brake lever (2) and a cylinder housing (3) with a cylinder space (13), and a piston unit (4) displaceably received in the cylinder space (13), and at least one equalizing reservoir device (5) with a tank space (15) for a hydraulic fluid, wherein the piston unit (4) and the cylinder housing (3) delimit a pressure space (131), and wherein the pressure space (131) is connected with the tank space (15) through at least one equalizing hole (53), wherein the handlebar mount (8) defines a mounting axis (18), and wherein the master unit (10) can be mounted at a rotation angle around the mounting axis (18), by means of the handlebar mount (8), wherein the brake lever (2) is disposed at the lever-side end (32) of the master unit (10), and the handlebar mount (8) is disposed at the handlebar-side end (28) of the master unit (10), comprising a vent duct arrangement (9), connecting a vent opening (65), which opens into the environment of the master unit (10), both with the tank space opening (79) and with the pressure space opening (89), so as to allow to simultaneously vent through the vent opening (65) both the tank space (15) and the pressure space (131), characterized in that the vent duct arrangement (9) rises between the pressure space opening (89) and the vent opening (65) and between the tank space opening (79) and the vent opening (65), so that any air bubbles can rise to the vent opening (65) out of the pressure space (131) and out of the tank space (15), when the master unit (10) is rotated around the mounting axis (18) so that the lever-side end (32) faces downwardly and the pressure space opening (89) lies in the range of the highest spot of the pressure space (131), and the tank space opening (79) lies in the region of the highest spot of the tank space (15).

2. The brake arrangement (1) according to the preceding claim, wherein the air bubbles can rise to the vent opening (65) out of the pressure space (131) and out of the tank space (15), at least when the master unit (10) is rotated around the mounting axis (18) at an angle between 0° and 90° to the horizontal.

3. The brake arrangement (1) according to any of the preceding claims, wherein the piston unit (4) is accommodated in the cylinder space (13), displaceably along a longitudinal axis (24), and wherein the piston unit (4) extends between the lever-side end (32) and the handlebar-side end (28) in respect of its longitudinal axis (24), and wherein the piston unit (4) is displaceable by operating the brake lever (2) from the lever-side end (32) in the direction toward the handlebar-side end (28).

4. The brake arrangement (1) according to any of the preceding claims, wherein the vent duct arrangement (9) is provided to be closed by means of a detachable paddle (19), and wherein the paddle (19) can be inserted in the vent duct arrangement (9), so that the pressure space (131) is sealed relative to the tank space (15) and also relative to the vent opening (65), and wherein the paddle (19) is in particular configured as a screw (19a).

5. The brake arrangement (1) according to the preceding claim, wherein releasing the paddle (19) causes the pressure space (131) to connect with the tank space (15) and also to open the vent opening (65).

6. The brake arrangement (1) according to any of the preceding claims, wherein the vent duct arrangement (9) comprises at least two duct branches (29a, 39a), wherein at least one duct branch (29a) opens into the pressure space (131) and at least one duct branch (39a), into the tank space (15).

7. The brake arrangement (1) according to any of the preceding claims, wherein the vent duct arrangement (9) comprises at least one principal duct (29) which extends from the pressure space (131) to the vent opening (65), and at least one branch duct (39), which extends from the principal duct (29) to the tank space (15), and wherein the principal duct (29) extends in particular steeper than does the branch duct (39).

8. The brake arrangement (1) according to the preceding claim and claim 4, wherein the paddle (19) comprises at its bottom end facing the pressure space (131), an in particular conical sealing surface (191) which corresponds with a seating (192), wherein the seating (192) is provided by a cross section reduction (29b) in the principal duct (29), and wherein the paddle (19) comprises at its top end facing the vent opening (65), a collar section (193), and wherein between the collar section (193) and the housing body (49) in which the vent duct arrangement (9) is configured, at least one sealing body (194) is disposed for sealing the vent duct arrangement (9) relative to the environment.

9. The brake arrangement (1) according to any of the two preceding claims and claim 4, wherein the paddle (19) comprises at least one threaded portion (190) for screwing into the vent duct arrangement (9), and wherein the threaded portion (190) is disposed between the branch duct (39) and the vent opening (65), and / or is not disposed between the branch duct (39) and the pressure space (131), when the paddle (19) is screwed into the vent duct arrangement (9).

10. The brake arrangement (1) according to any of the three preceding claims, wherein the entire branch duct (39) extends higher than the highest spot of the pressure space (131), and / or wherein the mouth of the branch duct (39) into the principal duct (29) is disposed higher than the mouth of the principal duct (29) into the pressure space (131).

11. The brake arrangement (1) according to any of the four preceding claims and claim 4, wherein the paddle (19) is disposed in the principal duct (29) only when it seals the pressure space (131) relative to the tank space (15) and also relative to the vent opening (65).

12. The brake arrangement (1) according to any of the preceding claims, wherein the tank space (15) is disposed above the pressure space (131) at least in sections.

13. The brake arrangement (1) according to any of the preceding claims, wherein the vent opening (65) represents the highest spot of the vent duct arrangement (9) and preferably of the entire hydraulic circuit (11), and is in particular disposed higher than the highest spot of the tank space (15) and / or the pressure space (131).

14. The brake arrangement (1) according to any of the preceding claims, wherein the handlebar mount (8) and the piston unit (4) are disposed relative to one another so that the piston unit (4) protrudes radially from the handlebar (101) relative to its longitudinal axis (24), when the master unit (10) is mounted to the handlebar (101) in the proper, intended mounted position.

15. A bicycle (100) with a hydraulic brake arrangement (1) according to any of the preceding claims.