Hydraulic block of power-assisted brake system

Abstract

The invention relates to a hydraulic block (84) of a booster brake system, which is designed as a rectangular parallelepiped housing block. The hydraulic block (84) comprises a booster cylinder bore (92) for accommodating the booster cylinder (16) and two chambers (44a, 44b) arranged above the booster cylinder bore (92), the two chambers forming a brake fluid reservoir (44). A separating cylinder (60) is arranged on the side of the booster cylinder bore (92) opposite the brake fluid reservoir (44), which separating cylinder runs at right angles to the booster cylinder bore (92), and a separating piston (64) is arranged in the separating cylinder, which separating piston hydraulically separates a first supply connection (32) and a second supply connection (80), which are connected to the driving dynamic control unit (8), from each other. The release cylinder (60) is hydraulically connected to the booster cylinder (16) in such a way that a first axial piston side (70) of the release piston (64) can be loaded with a pressure of the booster cylinder (16) and a brake pressure can be generated by means of a second axial piston side (70) of the release piston (64).

Description

Technical Field

[0001] The invention relates to a hydraulic block of a power-assisted brake device. In addition, the invention also relates to a brake system without a master brake cylinder, which has such a hydraulic block. Background Art

[0002] Patent document DE 10 2018 220 573 A1 relates to a hydraulic block for a hydraulic assembly of a hydraulically assisted vehicle brake system. The hydraulic block has a hole for a booster cylinder perpendicular to the hole for the master brake cylinder and a receptacle for a pedal travel simulator. The receptacle for the pedal travel simulator is arranged parallel to the hole for the booster cylinder in the hydraulic block.

[0003] A hydraulic block for a hydraulically assisted vehicle brake system is known from patent document DE 10 2017 204 407 A1, wherein interfaces for wheel brakes and interfaces for brake fluid storage containers are arranged on the large side of the hydraulic block along the lateral sides or along the longitudinal sides of the hydraulic block. Summary of the invention

[0004] The invention is based on the object of providing a hydraulic block for a power-assisted brake system which requires reduced installation space and can be produced economically.

[0005] This object is achieved by a hydraulic block for a power-assisted brake system having the features of claim 1. The dependent claims referred back to above reflect advantageous developments of the invention.

[0006] The present invention proposes a hydraulic block of a power-assisted brake device, which is configured as a rectangular housing block. The hydraulic block includes a booster cylinder hole for accommodating a booster cylinder and two chambers arranged above the booster cylinder hole, which form a brake fluid reservoir. Here, the rectangular housing block is preferably formed by an extruded aluminum block. Such an extruded aluminum block can be easily and cost-effectively produced, so that the cost of such a hydraulic block can be kept very low. By using aluminum or an aluminum alloy, the weight of the hydraulic block can be reduced. Here, the first chamber and the second chamber of the brake fluid reservoir are formed in the housing, so that no additional accessories are required and structural space can be saved.

[0007] On the side of the booster cylinder hole opposite to the brake fluid reservoir, a separation cylinder is arranged, which extends at a right angle to the booster cylinder hole, and a separation piston is arranged in the separation cylinder, which hydraulically separates the first supply interface and the second supply interface connected to the driving dynamics control unit from each other. Here, the booster cylinder hole advantageously extends in the thickness direction of the hydraulic block, while the separation cylinder extends in the length direction. Since the length of the separation cylinder is greater than the length of the booster cylinder hole, the thickness of the hydraulic block does not need to be increased due to the right-angle arrangement of the separation cylinder, so that the required structural space of the hydraulic block can be kept very low. By separating the supply interface, the necessary reliability can be provided by the separation cylinder, so that in the event of a leak in one brake circuit, the other brake circuit remains functional. The separation cylinder also has the advantage that, unlike other interconnections that have a separate separation valve to separate the brake circuit, only a single separation cylinder is required for separation. This can further reduce the structural space of such a hydraulic block.

[0008] The release cylinder is hydraulically connected to the booster cylinder so that the first axial piston side of the release piston can be loaded with the pressure of the booster cylinder and the brake pressure can be generated via the second axial piston side of the release piston. The release cylinder is therefore used not only to release the brake circuits but also to build up pressure in one of the circuits.

[0009] The hydraulic block is particularly preferably designed without a master cylinder. In other words, no master brake cylinder actuated by the brake pedal is arranged in the hydraulic block. Therefore, by designing the hydraulic block in this way, space for the master cylinder can be saved, so that the components and the installation space for such a hydraulic block can be significantly reduced and such a hydraulic block can be produced economically.

[0010] In a preferred embodiment of the invention, the first axial piston side of the separating piston is configured such that, when this piston side abuts against the bottom of the separating cylinder, a portion of this piston side is spaced apart from the bottom of the separating cylinder. Thus, the piston side only partially abuts against the bottom of the separating cylinder. This configuration creates a space for arranging the brake fluid between the piston side and the bottom of the separating cylinder. Thus, the pressure of the brake fluid can in turn act on a portion of the piston surface in order to enable the piston to move in the separating cylinder. The piston side is advantageously provided with a central bulge, which abuts against the bottom of the separating cylinder.

[0011] In another preferred embodiment of the invention, an EMV (Elektromagnetische Electromagnetic compatibility (EMC) contacts. Therefore, no separate EMC contacts are provided. Therefore, the EMC contacts are formed by the existing cover of the booster cylinder. Thus, the cover of the booster cylinder directly fulfills multiple functions. Therefore, space for separate EMC contacts can be saved, so that the size of the hydraulic block can be reduced.

[0012] The electrical contacts and the switching valve for the control device are preferably arranged in the area of ​​a quarter of the cover around the booster cylinder for switching the connection between the first chamber of the brake fluid reservoir and the first supply interface. Both the electrical contacts and the switching valve are connected to the circuit board of the control device. The rotor sensor contacts are particularly preferably arranged in the area of ​​the quarter. These contacts and the switching valve are arranged in a defined area. Compared to an arrangement in which the contacts are distributed over the entire side of the hydraulic block, the size of the circuit board and thus also the size of the control device can be reduced, so that the required installation space for the hydraulic block can be kept low by this arrangement.

[0013] In an advantageous improvement, the electrical contacts and the switching valve for the control device are arranged on the side of the power cylinder facing the plug of the control device. The circuit board of the control device is connected not only to the plug but also to the contacts. By appropriately arranging the contacts, the distance between the plug and the contacts can be minimized. Therefore, the circuit board only has to have the length between the contacts and the plug. This can further reduce the size of the circuit board and thus the size of the control device.

[0014] Advantageously, a depression is formed at the bore for the booster cylinder, via which depression the switching valve is connected to the first chamber of the brake fluid reservoir. The depression is designed as a defined area with a diameter greater than the inner diameter of the bore for the booster cylinder. This forms a hydraulic line through which the brake fluid can be guided around the bore for the booster cylinder. Thus, it is not necessary to shift the bore for the booster cylinder in order to form the hydraulic bore. Since such a shift would increase the size of the entire hydraulic block, such a depression makes it possible to achieve a compact and space-saving shape of the hydraulic block.

[0015] In another advantageous embodiment, the release piston has at least one through-hole, via which the supply interface for the driving dynamics control is connected to the second chamber of the brake fluid reservoir in the basic position of the release piston. In order to bring the release piston into the basic position in which a part of the piston side lies against the bottom of the release cylinder, a release piston spring is advantageously arranged on the opposite piston side. The basic position is thus assumed by the release piston spring when the piston side facing away from the release piston spring is not pressurized. In order to connect the second chamber of the brake fluid reservoir to the supply interface for the driving dynamics control, the release cylinder is connected to the brake fluid reservoir via a hydraulic line. Thus, in the basic position, the driving dynamics control can be supplied with brake fluid from the brake fluid reservoir via the through-hole in the release piston. The through-hole in the release piston, which advantageously interacts with the seal, thus simultaneously forms a valve between the brake fluid reservoir and the driving dynamics control. The release cylinder thus has multiple functions, thereby reducing the number of components and saving structural space.

[0016] According to an advantageous embodiment, the hydraulic block is provided with two supply connections for the vehicle dynamics control, which are oriented toward the control device and are arranged vertically one above the other. The vertical arrangement of the supply connections enables a space-saving arrangement of the connections in the hydraulic block, so that the width of the hydraulic block does not need to be increased.

[0017] According to another suitable embodiment, the switching valve and the booster cylinder are connected to the supply interface for the vehicle dynamics control via a common horizontal connecting hole. This eliminates the need to provide separate holes for the switching valve and the booster cylinder. This reduces the manufacturing time. Likewise, there is no need to provide space for the separate additional hole, so that the hydraulic block requires less structural space.

[0018] The present invention also proposes a brake system without a master brake cylinder, which has a hydraulic block according to the present invention. The advantage of a brake system without a master brake cylinder is that space for the master cylinder and the hydraulic lines required therefor can be saved, so that the space required for the entire brake system is small. With this brake system, the advantages already mentioned with respect to the hydraulic block are also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Embodiments of the invention are shown in the drawings and explained in more detail in the following description.

[0020] Figure 1 shows a braking system according to an embodiment of the present invention;

[0021] Figure 2 An exploded view of an embodiment of a hydraulic block is shown;

[0022] Figure 3 shows a front view of an embodiment of a hydraulic block;

[0023] Figure 4 Shows Figure 2 a perspective view of the hydraulic block shown; and

[0024] Figure 5 A cross-sectional view of an embodiment of a separator cylinder with a separator piston is shown. DETAILED DESCRIPTION

[0025] Figure 1A brake system 1 according to an exemplary embodiment of the invention is shown. The brake system 1 comprises two units 4, 8. The first unit 4 comprises a booster brake pressure generator 12 having a booster cylinder 16 and a spindle transmission assembly 24, in which a booster piston 20 can move. The spindle transmission assembly 24 is connected to a motor 28 of the booster brake pressure generator 12, whereby a rotational movement of the spindle transmission assembly 24 is converted into a translational movement of the booster piston 20. The brake pressure is provided at a first supply interface 32 by the translational movement of the booster piston 20. A first brake circuit 36 ​​of the second unit 8, which is designed as a driving dynamics control unit, is connected to the first supply interface 32. The two wheel brakes 40 of the first brake circuit 36 ​​are actuated by the brake pressure.

[0026] The first unit 4 additionally has a brake fluid reservoir 44, which is divided into two chambers 44a, 44b. The first chamber 44a of the brake fluid reservoir 44 is connected to the booster cylinder 16 and the first supply interface 32 via a check valve 48 that closes the first chamber 44a. A 2 / 2-way switching valve 52 is arranged in parallel with the check valve 48, which is passable in the de-energized state. The switching valve 52 is additionally configured with a switching check valve 52a that closes the brake fluid reservoir 44.

[0027] Furthermore, the first unit 4 comprises a separating valve 56 which is supplied with brake fluid via the second chamber 44b of the brake fluid reservoir 44. The separating valve 56 comprises a separating cylinder 60 and a separating piston 64 which can move in the separating cylinder 60. A separating piston spring 68 is arranged at the second axial piston side 66, which pushes the separating piston 64 in one direction. The separating piston 64 additionally has a separating piston bulge 72 on the piston side facing away from the separating piston spring 68, so that the first axial piston side 70 of the separating piston 64 does not rest on the separating cylinder bottom 76 over the entire surface.

[0028] On the side of the release cylinder 60 on which the release piston spring 68 is arranged, the release cylinder is hydraulically connected to the second supply connection 80. The first axial piston side 70 is connected both to the booster brake pressure generator 12 and to the first supply connection 32. When pressure is generated by the booster brake pressure generator 12 on the first axial piston side 70, the release piston 64 moves in the direction of the release piston spring 68, so that in addition to the pressure generated at the first supply connection 32, a brake pressure is also generated at the second supply connection 80 via the second axial piston side 66. As a result, a brake pressure can be generated in the second brake circuit 82 of the second unit 8.

[0029] Figure 1 The second unit 8 shown represents a conventional vehicle dynamics control system, such as an ESP control system, which is not explained in any more detail here.

[0030] Figure 2 An exploded view of an embodiment of a hydraulic block 84 is shown. Here, the first unit 4 is completely formed by this hydraulic block 84. The first chamber 44a and the second chamber 44b of the brake fluid reservoir 44 are arranged at the upper side of the hydraulic block 84. These chambers 44a, 44b are closed by plugs 88. In the hydraulic block 84, a booster cylinder bore 92 is arranged centrally in the thickness direction, which booster cylinder bore accommodates the booster cylinder 16. The booster piston 20 in the booster cylinder 16 can be moved axially in the booster cylinder 16 via a transmission 100 that can be driven by the motor 28.

[0031] A separation cylinder 60 is additionally configured in the hydraulic block 84. Here, the separation cylinder 60 is arranged on the opposite side of the booster cylinder hole 92 relative to the brake fluid reservoir 44, so that the separation cylinder 60 is located below the booster cylinder hole 92. The separation cylinder 60 is configured to be at a right angle to the booster cylinder hole 92. A separation piston 64 is arranged in the separation cylinder 60, and the separation piston can move in the axial direction of the separation cylinder 60. A separation piston spring 68 is arranged between the separation cylinder cover 104 and the separation piston 64, and a spring force is applied to the separation piston 64 in the direction away from the separation cylinder cover 104 by the separation piston spring. In order to seal the separation piston 64 in the separation cylinder 60, two seals 108 are additionally arranged in the separation cylinder 60.

[0032] On the side of the hydraulic block 84 opposite the motor 28, a cover 112 of the booster cylinder 16 is arranged, by which the booster cylinder is closed. A switching valve 52 is additionally arranged on this side, which is accommodated in a correspondingly designed opening 113 for a switching valve in the hydraulic block 84. The cover 112 and the switching valve 52 extend into a control device 114 arranged on this side. The control device 114 has a plug 116, by which the control device 114 is contacted and which protrudes laterally beyond the hydraulic block 84 when the control device 114 is installed.

[0033] The hydraulic block 84 is additionally configured with a contact hole 120 around the power cylinder 16 in the region of the switching valve 52, through which an electrical contact 124 for the motor 28 can be connected to the control device 114 through the hydraulic block 84. In addition, a rotor sensor contact hole 122 is configured around the power cylinder 16 in the region of the switching valve 52, through which a rotor sensor contact 123 is connected to the control device 114. In this embodiment, the contact hole 120, the hole 113 for the switching valve, and the rotor sensor contact hole 122 are arranged in a quadrant of the cover 112 around the power cylinder 16. In particular, the contact hole 120 and therefore the contact 124, the rotor sensor contact 123 and the switching valve 52 are arranged on the side of the power cylinder hole 92 facing the plug 116 of the control device 114. In addition, the first supply interface 32 and the second supply interface 80 are arranged on one side of the control device 114.

[0034] Figure 3 , a front view of an embodiment of a hydraulic block 84 is shown. In this embodiment, it is shown how the components and hydraulic lines are arranged in the hydraulic block 84. Here, the horizontal connecting hole 128 connects the switching valve 52 and the booster cylinder 16 to the first supply interface 32 for the driving dynamics control unit 8. Figure 3 In the embodiment shown, the supply interfaces 32, 80 for the driving dynamics control unit 8 are arranged vertically one above the other and are oriented toward the control device 114. The supply interfaces 32, 80 and the contact hole 120 are arranged on opposite sides of the hole 92 for the booster cylinder. In order to supply brake fluid to the release cylinder 60, a supply line 132 formed by a vertical hole and a horizontal hole is formed in the hydraulic block 84, which connects the second chamber 44b of the brake fluid reservoir 44 to the release cylinder 60.

[0035] Figure 4 Shows Figure 2 84 is shown in a perspective view. It can be seen in this figure that a recess 136 is formed in the booster cylinder bore 92, via which the switching valve bore 113 is connected to the first chamber 44a of the brake fluid reservoir 44. In addition, it is shown that the booster cylinder bore 92 is connected to the rear region of the release cylinder 60 via the front bore 140.

[0036] Figure 5 The sectional view of an embodiment of a separating cylinder 60 with a separating piston 64 is shown. Here, the separating piston 64 is pushed in the direction of the separating cylinder bottom 76 by a separating piston spring 68 arranged between the separating piston 64 and the separating cylinder cover 104. The separating piston 64 has a central separating piston bulge 72 on the side facing the separating cylinder bottom 76, by which the separating piston 64 does not rest on the separating cylinder bottom 76 over its entire surface. As a result, the pressure of the booster cylinder 16 acting in the region of the separating cylinder bottom 76 can continue to act on the separating piston 64, so that the separating piston 64 moves in the direction of the separating cylinder cover 104.

[0037] The supply line 132 connected to the brake fluid reservoir 44 is arranged in the middle region of the separator cylinder 60 so that it is connected to the separator cylinder 60 in the region of the separator piston 64. On both sides of the supply line 132, the seals 108 abut against the separator piston 64 so that the remaining separator cylinder 60 is isolated from the supply line 132. The separator piston 64 has a through hole 144 at the circumference, which is located between the two seals 108 in the basic position of the separator piston 64 against the separator cylinder bottom 76. As a result, in the basic position, the connection between the supply line 132 and the supply interface hole 148 leading to the second supply interface 80 is not blocked. As soon as the separator piston 64 moves in the direction of the separator cylinder cover 104 due to the pressure of the power cylinder 16, the connection is closed. The separator piston 64 thus simultaneously forms a valve.

Claims

1. A hydraulic block (84) of a power-assisted brake device, the hydraulic block being constructed as a rectangular parallelepiped housing block, comprising a power-assisted cylinder hole (92) for accommodating a power-assisted cylinder (16) and two chambers (44a, 44b) arranged above the power-assisted cylinder hole (92), the chambers forming a brake fluid reservoir (44), It is characterized in that A separation cylinder (60) is arranged on the side of the booster cylinder hole (92) opposite to the brake fluid reservoir (44), the separation cylinder extending at a right angle to the booster cylinder hole (92), and a separation piston (64) is arranged in the separation cylinder, the separation piston hydraulically separating a first supply interface (32) and a second supply interface (80) connected to a driving dynamics control unit (8) from each other, wherein the separation cylinder (60) is hydraulically connected to the booster cylinder (16) so that a first axial piston side (70) of the separation piston (64) can be loaded with the pressure of the booster cylinder (16) and a brake pressure can be generated via a second axial piston side (66) of the separation piston (64).

2. The hydraulic block (84) according to claim 1, characterized in that A first axial piston side (70) of the separating piston (64) is configured such that when the piston side (70) abuts against a separating cylinder bottom (76), a portion of the piston side (70) is spaced apart from the separating cylinder bottom (76).

3. The hydraulic block (84) according to any one of the preceding claims, characterized in that The EMC contacts for the control device are provided via a cover (112) of the booster cylinder (16).

4. The hydraulic block (84) according to any one of the preceding claims, characterized in that An electrical contact (124) for a control device (114) and a switching valve (52) are arranged in a quarter circle area surrounding a cover (112) of the booster cylinder (16) for switching the connection between a first chamber (44a) of the brake fluid reservoir (44) and the first supply interface (32).

5. The hydraulic block (84) according to claim 4, characterized in that An electrical contact (124) for the control device (114) and the switching valve (52) are arranged on a side of the booster cylinder (16) that faces a plug (116) of the control device (114).

6. The hydraulic block (84) according to any one of the preceding claims, characterized in that A recess (136) is formed in the booster cylinder hole (92), and the switching valve (52) is connected to the first chamber (44a) of the brake fluid reservoir (44) via the recess.

7. The hydraulic block (84) according to any one of the preceding claims, characterized in that The separating piston (64) has at least one through-hole (144), via which, in the basic position of the separating piston (64), a supply connection (32, 80) for the vehicle dynamics control (8) is connected to a second chamber (44b) of the brake fluid reservoir (44).

8. The hydraulic block (84) according to any one of the preceding claims, characterized in that The hydraulic block (84) is formed with two supply connections (32, 80) for the vehicle dynamics control (8), which are oriented toward the control device (114) and are arranged vertically one above the other.

9. The hydraulic block (84) according to any one of the preceding claims, characterized in that The switching valve (52) and the booster cylinder (16) are connected to a supply interface (32, 80) for a vehicle dynamics control unit (8) via a common horizontal connecting hole (128).

10. A brake system (1) without a master brake cylinder, comprising a hydraulic block (84) according to any one of the preceding claims.

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