Wind power generation brake disc assembly

Abstract

The utility model discloses a wind power generation brake disc assembly which comprises a brake caliper shell and a brake disc, adjustable installation pieces are symmetrically distributed between the left inner wall and the right inner wall of the brake caliper shell, friction pieces are symmetrically distributed on the opposite inner side faces of the two installation pieces, and the brake disc is located between the transversely adjacent friction pieces. The device further comprises an auxiliary braking mechanism. The auxiliary braking mechanism comprises hydraulic rods, hemispherical heads and hollow hemispherical protrusions, the hydraulic rods are symmetrically distributed and installed on the opposite inner side faces of the two installation pieces, the hydraulic rods are located between the two friction pieces which are adjacent up and down, and according to the wind power generation brake disc assembly, the hemispherical heads make contact with the spherical surfaces of the protrusions, braking force is transmitted through shearing force, and the braking force is transmitted through the hollow hemispherical protrusions. And mechanical meshing and friction dual braking is formed, on the basis of friction plate braking, additional braking force is provided, the braking force of the braking assembly on the braking disc is increased, and the braking time of the wind driven generator is effectively shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation structure component technology field, concretely is a kind of wind power generation brake disc assembly. BACKGROUND

[0002] With the increasing demand for clean energy in the world, wind power generation as a sustainable energy acquisition method, the position in the energy field is increasingly important, wind power generation is driven by wind turbine blade rotation, and then drive generator rotor rotation produces electric energy, in the wind power generation system operation process, brake system is the key part to guarantee the safe and stable operation of equipment, when wind turbine needs emergency shutdown, maintenance and repair or in the case of high wind speed may endanger equipment safety, reliable brake device is needed to make wind turbine stop running quickly, in the existing wind power generation braking technology, the common brake disc assembly mainly relies on the friction between the friction plate in brake clamp and brake disc to realize braking, when wind power generation system receives brake signal, signal is first transmitted to brake control system, brake signal source can include high wind speed, generator fault, power grid anomaly and other safety protection mechanisms, or brake instruction issued by human operation, brake control system receives signal, immediately starts brake hydraulic system, hydraulic pump starts working, hydraulic oil is pumped out from oil tank and pressurized to the piston chamber of brake clamp, with the injection of hydraulic oil, the piston is moved outward under the action of hydraulic pressure, piston moves to drive friction plate to close to brake disc surface, until friction plate and brake disc are in close contact, at this time, friction is generated between friction plate and brake disc, the direction of this friction is opposite to the rotation direction of brake disc, with the action of friction, the rotation speed of brake disc gradually reduces until stopping, this braking mode can meet the basic braking demand to some extent, but with the continuous development of wind power generation technology, the power and speed of wind turbine are continuously improved, traditional braking mode gradually exposes some problems, simply rely on friction plate braking, braking force is limited, when wind turbine is running at high speed, braking time is long, it is difficult to meet the demand of emergency braking, therefore, we propose a kind of wind power generation brake disc assembly. CONTENT OF UTILITY MODEL

[0003] The utility model solves the technical problem to overcome the existing defects, provide a kind of wind power generation brake disc assembly, provide additional braking force on the basis of friction plate braking, effectively shorten the braking time of wind power generator, can effectively solve the problems in background art.

[0004] In order to achieve the above object, the utility model provides the following technical scheme: a wind power generation brake disc assembly, including brake calliper shell and brake disc, the left and right inner wall of brake calliper shell between symmetry distribution is equipped with adjustable mounting piece, the opposite inner side of two mounting pieces all is equipped with the friction piece of symmetry distribution, the brake disc is located between the friction piece of transverse adjacent, still include auxiliary brake mechanism,

[0005] Auxiliary brake mechanism: it includes hydraulic rod, half ball head and hollow half ball convex, the opposite inner side of two mounting pieces is installed to the hydraulic rod symmetry distribution, and the hydraulic rod is located between two friction pieces adjacent to each other, the extension end of the hydraulic rod is equipped with half ball head, the left and right sides of the brake disc are equipped with the hollow half ball convex of uniform distribution, and the hollow half ball convex is located between two friction pieces adjacent to each other, and the hollow half ball convex is arranged in cooperation with the half ball head adjacent to each other, and the spherical surface of half ball head and convex is contacted, and the braking force is transmitted through shear force, and mechanical engagement plus friction double brake is formed, on the basis of friction piece brake, additional braking force is provided, the braking force of brake disc of brake assembly is increased, and the braking time of wind driven generator is effectively shortened.

[0006] Further, the auxiliary brake mechanism further includes a spring, the plane of the half ball head away from the center of the brake disc is provided between the transversely adjacent mounting pieces, and the spring is sleeved on the outer arc surface of the adjacent hydraulic rod.

[0007] Further, the middle part of the brake disc is provided with a heat dissipation cavity, the left and right inner walls of the heat dissipation cavity are provided with evenly distributed blades, the left and right side walls of the brake disc are provided with evenly distributed heat dissipation holes, the heat dissipation holes are communicated with the heat dissipation cavity, and heat dissipation is provided.

[0008] Further, the auxiliary brake mechanism further includes a mounting hole, the left and right side walls of the brake disc are provided with evenly distributed mounting holes, the mounting holes are communicated with the heat dissipation cavity, and the end of the hollow half ball convex close to the center of the brake disc is fixedly connected with the inner wall of the transversely adjacent mounting hole.

[0009] Further, the auxiliary brake mechanism further includes a heat conduction groove, the plane end of the half ball head is provided with evenly distributed heat conduction grooves, the inside of the heat conduction grooves is filled with heat conduction paste, and the local temperature of the half ball head is effectively reduced.

[0010] Further, the left and right inner walls of the brake caliper shell are provided with uniformly distributed sliding holes, the brake columns are slidably connected to the inside of the sliding holes, one end of the brake column close to the center of the brake disc is fixedly connected to the outer side of the transversely adjacent mounting plate, the inner wall of the sliding hole is provided with a mounting groove, the sealing ring is arranged in the mounting groove, the inner arc surface of the sealing ring is slidably connected to the outer arc surface of the adjacent brake column, and the normal work of the brake system is guaranteed.

[0011] Further, the left and right inner walls of the brake caliper shell are provided with uniformly distributed sliding holes, the brake columns are slidably connected to the inside of the sliding holes, one end of the brake column close to the center of the brake disc is fixedly connected to the outer side of the transversely adjacent mounting plate, the inner wall of the sliding hole is provided with a mounting groove, the sealing ring is arranged in the mounting groove, the inner arc surface of the sealing ring is slidably connected to the outer arc surface of the adjacent brake column, and the normal work of the brake system is guaranteed.

[0012] Compared with the prior art, the wind power generation brake disc assembly has the following advantages:

[0013] The wind power generation brake disc assembly adds an auxiliary brake mechanism, significantly improves the braking performance, the hemispherical head is in contact with the convex spherical surface, the braking force is transmitted through the shearing force, mechanical engagement and friction double braking are formed, additional braking force is provided on the basis of the friction plate braking, the braking force of the brake assembly on the brake disc is increased, and the friction force between the brake disc and the brake component is increased, so that the wind power generator braking is more rapid and reliable, and the braking time of the wind power generator is effectively shortened. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural schematic view of the right end of the utility model;

[0016] Figure 3 It is a structural schematic view of the front section of the utility model;

[0017] Figure 4 It is a structural schematic view of the hemispherical head of the utility model;

[0018] Figure 5 It is a structural schematic view of the brake disc of the utility model;

[0019] Figure 6 It is a structural schematic view of the brake caliper shell of the utility model;

[0020] Figure 7 It is a structural schematic view of the utility model A enlarged view.

[0021] In the figure: 1 brake caliper shell, 2 auxiliary brake mechanism, 21 hydraulic rod, 22 half ball head, 23 hollow half ball convex, 24 spring, 25 heat conduction groove, 26 mounting hole, 3 mounting piece, 4 friction plate, 5 brake fluid cavity, 6 sliding hole, 7 mounting groove, 8 sealing ring, 9 liquid pipe, 10 connecting pipe, 11 liquid inlet pipe, 12 brake disc, 13 heat dissipation cavity, 14 blade, 15 heat dissipation hole, 16 brake column. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figures 1-7The embodiment provides a technical scheme: a wind power generation brake disc assembly, which comprises a brake caliper shell 1 and a brake disc 12, adjustable mounting pieces 3 are symmetrically arranged between the left and right inner walls of the brake caliper shell 1, uniform sliding holes 6 are arranged in the left and right inner walls of the brake caliper shell 1, brake columns 16 are slidably connected in the sliding holes 6, one end of the brake column 16 close to the center of the brake disc 12 is fixedly connected with the outer side of the transversely adjacent mounting piece 3, mounting grooves 7 are arranged in the inner walls of the sliding holes 6, sealing rings 8 are arranged in the mounting grooves 7, the inner arc surfaces of the sealing rings 8 are slidably connected with the outer arc surfaces of the adjacent brake columns 16, brake liquid cavities 5 are arranged in the left and right interiors of the brake caliper shell 1, the sliding holes 6 are communicated with the transverse brake liquid cavities 5, liquid pipes 9 are arranged at the communication openings arranged in the rear walls of the left and right ends of the brake caliper shell 1, the liquid pipes 9 are communicated with the brake liquid cavities 5 adjacent to the front sides, the two liquid pipes 9 are communicated through a connecting pipe 10, a liquid inlet pipe 11 is arranged in the front wall of the left end of the brake caliper shell 1, the liquid inlet pipe 11 is communicated with the brake liquid cavity 5 on the left side, symmetrically arranged friction pieces 4 are arranged on the opposite inner sides of the two mounting pieces 3, the brake disc 12 is located between the transversely adjacent friction pieces 4 (the friction pieces 4 are ceramic friction pieces, and the brake disc 12 is a ceramic brake disc), a heat dissipation cavity 13 is arranged in the middle of the brake disc 12, blades 14 are uniformly arranged between the left and right inner walls of the heat dissipation cavity 13, heat dissipation holes 15 are uniformly arranged in the left and right side walls of the brake disc 12, and the heat dissipation holes 15 are communicated with the heat dissipation cavity 13. First, the brake caliper shell 1 is preliminarily fixed in the corresponding position of equipment by bolts, then the brake disc 12 is accurately aligned with the center of the low-speed rotating shaft of the wind driven generator and is fixed by a key or a nut, then the output pipeline of an external brake liquid supply device (such as a brake pump) is connected with the liquid inlet pipe 11 and the sealing property of the connection is ensured, when the wind power generation device needs to be braked, after a brake instruction is given, the external brake liquid supply device starts to work, the piston or rotor in the brake pump operates to generate suction force, brake liquid in a liquid storage tank is sucked in, then pressure is applied to the brake liquid, the brake liquid is pressed into the liquid inlet pipe 11 through the connecting pipeline, the brake liquid is injected into the brake liquid cavity 5 on the left side through the liquid inlet pipe 11, because the two brake liquid cavities 5 are communicated through the liquid pipes 9 and the connecting pipe 10, the brake liquid is uniformly distributed into the two brake liquid cavities 5 under the action of pressure, the pressure in the brake liquid cavity 5 is increased, the brake column 16 is pushed to slide in the sliding hole 6, at this time, the sealing property of the sealing ring 8 is ensured, so the mounting piece 3 moves to the brake disc 12, the friction piece 4 is pressed against the brake disc 12, at this time, friction force is generated between the friction piece 4 and the brake disc 12, preliminary braking is realized, and auxiliary braking mechanism 2 is further included.

[0024] Auxiliary brake mechanism 2: it includes hydraulic rod 21, half ball head 22 and hollow half ball convex 23, hydraulic rod 21 is symmetrically arranged on the opposite inner side of two mounting sheets 3, and the extension end of hydraulic rod 21 is provided with half ball head 22 (half ball head 22 is a toughened zirconia ceramic half ball head, ordinary zirconia ceramic has certain toughness, and the toughness and impact resistance of zirconia ceramic can be further improved through some special processes such as phase transition toughening and micro crack toughening, the zirconia ceramic after toughening can absorb energy by phase transition when impacted, and prevent crack propagation, so that it can withstand extreme impact and long-term repeated impact), auxiliary brake mechanism 2 further includes heat conduction groove 25, the plane end of half ball head 22 is provided with uniformly distributed heat conduction groove 25, the inside of heat conduction groove 25 is filled with heat conduction paste, the heat conduction paste is silicon carbide heat conduction paste, auxiliary brake mechanism 2 further includes spring 24, the plane of half ball head 22 away from the center of brake disc 12 is connected with the transversely adjacent mounting sheet 3 through spring 24, spring 24 is sleeved on the outer arc surface of adjacent hydraulic rod 21, the left and right side of brake disc 12 is provided with uniformly distributed hollow half ball convex 23, the left and right side walls of brake disc 12 are provided with uniformly distributed mounting holes 26, the mounting holes 26 are in communication with the heat dissipation cavity 13, one end of the hollow half ball convex 23 near the center of brake disc 12 is fixedly connected with the inner wall of the transversely adjacent mounting hole 26, the hollow half ball convex 23 is located between the transversely adjacent two friction plates 4, and the hollow half ball convex 23 is matched with the transversely adjacent half ball head 22, when braking, with the rotation of brake disc 12, the hollow half ball convex 23 on the left and right side of brake disc 12 constantly contacts or approaches the adjacent half ball head 22, when the hollow half ball convex 23 contacts the half ball head 22, due to the rotation speed of brake disc 12 and the inertia of hollow half ball convex 23, an impact force is generated on the half ball head 22, the half ball head 22 transmits the force to the hydraulic rod 21 every time, so that the hydraulic rod 21 is compressed and shrunk, and the spring 24 is compressed at the same time, when the half ball head 22 is impacted by the hollow half ball convex 23, the half ball head 22 generates a counterforce, because force is the action of one object on another object, there is a force-giving object, and there is a force-receiving object, when the hollow half ball convex 23 impacts the half ball head 22, the half ball head 22 generates a counterforce with the same size and opposite direction to the hollow half ball convex 23, the counterforce is transmitted to the hydraulic rod 21 through the half ball head 22, and then to the mounting sheet 3, the mounting sheet 3 is connected with the brake caliper shell 1, and the force received by the mounting sheet 3 is transmitted to the brake caliper shell 1, because the brake caliper shell 1 is a relatively fixed component, it will resist the transmitted force, and the resistance forms a counterforce on brake disc 12, like pushing an object fixed on the wall, the wall will generate a counterforce on the object, during the rotation of brake disc 12, the brake disc 12 receives the counterforce from the brake caliper shell 1,And the direction of this reaction force is opposite to the direction of the rotation of the brake disc 12, according to the force can change the state of motion of the object, this reaction force is converted into braking force, hinder the rotation of the brake disc 12, so as to realize the purpose of braking, and, the hemispherical head 22 and the surface between the hollow hemispherical convex 23 also exist friction, further enhance the braking effect, with the continuous rotation of the brake disc 12, this impact repeatedly, braking force is also accumulated, the rotation speed of the brake disc 12 gradually reduces, in the process of braking, hollow hemispherical convex 23 because of the impact, friction with the hemispherical head 22 will produce a lot of heat, the brake disc 12 rotates, the blade 14 drives the air flow, accelerate the air circulation in the heat dissipation cavity, hollow hemispherical convex 23 generated by the heat through the mounting hole 26 to the heat dissipation cavity 13, hot air under the action of the blade 14, through the heat dissipation cavity 13 fast flow, again through the left and right side wall of the brake disc 12 heat dissipation hole 15 discharge, cold air from the other side into the formation of good heat dissipation channel, thereby effectively reduce the temperature of the hollow hemispherical convex 23 and the temperature of the brake disc 12 itself, in addition, the hemispherical head 22 plane end set up heat conduction groove 25 and filled with silicon carbide heat conduction paste, can quickly conduct the heat generated in the process of braking, heat through the heat conduction paste to the outside of the hemispherical head 22, again through the air convection and other ways to further heat dissipation, ensure its performance stability, avoid because of overheating lead to material performance decline, influence braking effect, reduce the braking time.

[0025] The working principle of the wind power generation brake disc assembly is as follows: firstly, the brake caliper shell 1 is preliminarily fixed on the corresponding position of the equipment by bolts, then the brake disc 12 is accurately aligned with the low-speed rotating shaft center of the wind driven generator, and is fixed by keys or nuts, then the output pipeline of the external brake fluid supply device (such as a brake pump) is connected with the liquid inlet pipe 11 and the sealing property of the connection is ensured, when the brake of the wind power generation device is needed, after the brake instruction is issued, the external brake fluid supply device starts to work, the piston or rotor in the brake pump operates to generate suction force, the brake fluid in the liquid storage tank is sucked in, then pressure is applied to press the brake fluid into the liquid inlet pipe 11 through the connecting pipeline, the brake fluid is injected into the left brake fluid chamber 5 through the liquid inlet pipe 11, since the two brake fluid chambers 5 are connected in communication through the liquid pipe 9 and the connecting pipe 10, the brake fluid is uniformly distributed into the two brake fluid chambers 5 under the action of pressure, the pressure in the brake fluid chamber 5 is increased to push the brake column 16 to slide in the sliding hole 6, at this time, the sealing ring 8 ensures the sealing property, so the mounting piece 3 moves to the brake disc 12 direction to drive the friction plate 4 to press the brake disc 12, at this time, the friction force is generated between the friction plate 4 and the brake disc 12 to realize preliminary braking, during the braking, with the rotation of the brake disc 12, the hollow hemispherical protrusions 23 on the left and right sides of the brake disc 12 continuously contact or abut the adjacent hemispherical heads 22, when the hollow hemispherical protrusions 23 contact the hemispherical heads 22, due to the rotation speed of the brake disc 12 and the inertia of the hollow hemispherical protrusions 23, impact force is generated on the hemispherical heads 22, each impact transmits the force to the hydraulic rod 21 to make the hydraulic rod 21 contract under pressure and compress the spring 24, when the hemispherical heads 22 are impacted by the hollow hemispherical protrusions 23, the hemispherical heads 22 generate a counterforce, because force is the action of one object on another object, there is a force-giving object and a force-receiving object, when the hollow hemispherical protrusions 23 impact the hemispherical heads 22, the hemispherical heads 22 give the hollow hemispherical protrusions 23 a counterforce which is equal in size and opposite in direction, the counterforce is transmitted to the hydraulic rod 21 through the hemispherical heads 22, then to the mounting piece 3, the mounting piece 3 is connected with the brake caliper shell 1, so the force received by the mounting piece 3 is transmitted to the brake caliper shell 1, since the brake caliper shell 1 is a relatively fixed component, it resists the transmitted force, the resistance forms a counterforce on the brake disc 12, like pushing an object fixed on the wall, the wall generates a counterforce on the object, during the rotation of the brake disc 12, the brake disc 12 receives the counterforce from the brake caliper shell 1, the direction of the counterforce is opposite to the rotation direction of the brake disc 12, according to the principle that force can change the motion state of an object, the counterforce is converted into braking force to hinder the rotation of the brake disc 12, so that the braking purpose is achieved, in addition, there is friction force between the surfaces of the hemispherical heads 22 and the hollow hemispherical protrusions 23 to further enhance the braking effect, with the continuous rotation of the brake disc 12, the impact is repeatedly, the braking force is continuously accumulated, and the rotation speed of the brake disc 12 is gradually reduced, during the braking process,The hollow hemispherical protrusion 23 generates a large amount of heat due to impact and friction with the hemispherical head 22, when the brake disc 12 rotates, the air flow is brought by the vane 14 to accelerate the air circulation in the heat dissipation cavity, the heat generated by the hollow hemispherical protrusion 23 is transmitted to the heat dissipation cavity 13 through the mounting hole 26, the hot air flows quickly through the heat dissipation cavity 13 under the action of the vane 14, and then is discharged through the heat dissipation hole 15 of the left and right side walls of the brake disc 12, cold air enters from the other side to form a good heat dissipation channel, so that the temperature of the hollow hemispherical protrusion 23 and the temperature of the brake disc 12 itself are effectively reduced, in addition, the heat dissipation groove 25 provided at the flat end of the hemispherical head 22 and the filled silicon carbide heat conduction paste can quickly conduct the heat generated during braking, the heat is transmitted to the outside of the hemispherical head 22 through the heat conduction paste, and is further heat dissipated through air convection and the like, so that the performance is stable, overheating is avoided, the material performance is prevented from being reduced, and the braking effect is affected.

[0026] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation obtained by using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A wind power generation brake disc assembly, comprising a brake caliper housing (1) and a brake disc (12), wherein adjustable mounting plates (3) are symmetrically distributed between the left and right inner walls of the brake caliper housing (1), and symmetrically distributed friction plates (4) are provided on the opposite inner surfaces of the two mounting plates (3), and the brake disc (12) is located between the laterally adjacent friction plates (4), characterized in that: It also includes an auxiliary braking mechanism (2); Auxiliary braking mechanism (2): It includes a hydraulic rod (21), a hemispherical head (22) and a hollow hemispherical protrusion (23). The hydraulic rod (21) is symmetrically distributed and installed on the opposite inner side of two mounting plates (3). The hydraulic rod (21) is located between two adjacent friction plates (4). The extension end of the hydraulic rod (21) is provided with a hemispherical head (22). The left and right sides of the brake disc (12) are provided with uniformly distributed hollow hemispherical protrusions (23). The hollow hemispherical protrusions (23) are located between two adjacent friction plates (4) in the lateral direction. The hollow hemispherical protrusions (23) are all configured to cooperate with the adjacent hemispherical heads (22).

2. The wind power generation brake disc assembly according to claim 1, characterized in that: The auxiliary braking mechanism (2) also includes springs (24). Springs (24) are provided between the plane of the hemispherical head (22) away from the center of the brake disc (12) and the adjacent mounting plate (3) in the lateral direction. The springs (24) are all sleeved on the outer arc surface of the adjacent hydraulic rod (21).

3. A wind power generation brake disc assembly according to claim 1, characterized in that: The brake disc (12) has a heat dissipation cavity (13) in the middle, and blades (14) are evenly distributed between the left and right inner walls of the heat dissipation cavity (13). The brake disc (12) has evenly distributed heat dissipation holes (15) on both the left and right side walls, and the heat dissipation holes (15) are all connected to the heat dissipation cavity (13).

4. A wind power generation brake disc assembly according to claim 3, characterized in that: The auxiliary braking mechanism (2) also includes mounting holes (26). The left and right side walls of the brake disc (12) are provided with evenly distributed mounting holes (26). The mounting holes (26) are all connected to the heat dissipation cavity (13). The end of the hollow hemispherical protrusion (23) near the center of the brake disc (12) is fixedly connected to the inner wall of the horizontally adjacent mounting hole (26).

5. A wind power generation brake disc assembly according to claim 1, characterized in that: The auxiliary braking mechanism (2) also includes heat conduction grooves (25). The flat end of the hemispherical head (22) is provided with uniformly distributed heat conduction grooves (25), and the interior of the heat conduction grooves (25) is filled with heat conduction paste.

6. A wind power generation brake disc assembly according to claim 1, characterized in that: The brake caliper housing (1) has evenly distributed sliding holes (6) on its left and right inner walls. A brake pin (16) is slidably connected inside each sliding hole (6). The end of the brake pin (16) near the center of the brake disc (12) is fixedly connected to the outer side of the horizontally adjacent mounting plate (3). The inner wall of each sliding hole (6) has a mounting groove (7). A sealing ring (8) is provided inside each mounting groove (7). The inner arc surface of the sealing ring (8) is slidably connected to the outer arc surface of the adjacent brake pin (16).

7. A wind power generation brake disc assembly according to claim 6, characterized in that: The brake caliper housing (1) has brake fluid chambers (5) on both the left and right sides. The sliding holes (6) are connected to the horizontal brake fluid chambers (5). The brake caliper housing (1) has fluid pipes (9) at the openings on the rear sidewalls at both ends. The fluid pipes (9) are connected to the adjacent brake fluid chambers (5) on the front side. The two fluid pipes (9) are connected by a connecting pipe (10). The brake caliper housing (1) has an inlet pipe (11) on the front sidewall of the left end. The inlet pipe (11) is connected to the brake fluid chamber (5) on the left side.

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