Hydraulic block for hydraulic assisted vehicle brake equipment

Abstract

The invention proposes to construct a hydraulic block (1) for a hydraulic aggregate for brake pressure generation and brake pressure regulation in a hydraulic booster vehicle brake system, which has an extension on the large side of the hydraulic block (1) which extends a booster cylinder bore (3) which runs transversely through the hydraulic block (1), and an extension (11) on the opposite large side (6) of the hydraulic block (1) which extends an anti-rotation guide (10) for a booster piston (4) of a booster brake pressure generator (2).

Description

TECHNICAL FIELD

[0001] The invention relates to a hydraulic block for a hydraulic aggregate of a hydraulic booster vehicle brake system, having the features of the preamble of claim 1. Such a hydraulic block serves for the mechanical fastening and hydraulic connection of hydraulic system components for brake pressure generation with booster, and for the adjustment or control of brake pressure, and / or for the slip regulation. With these hydraulic system components, the hydraulic block forms a hydraulic aggregate. BACKGROUND

[0002] The patent application DE 102017214593 A1 discloses a hydraulic aggregate for a hydraulic booster vehicle brake system, which has an elongated cuboid hydraulic block with a booster cylinder bore in which a booster piston is received in an axially displaceable manner for generating hydraulic brake pressure with booster. At the through-opening of the booster cylinder bore, an electric motor is fastened at the hydraulic block, with which the piston can be displaced in the booster cylinder bore of the hydraulic block by means of a screw drive. By displacing the booster piston in the booster cylinder bore, brake pressure can be generated and / or brake fluid can be delivered. With an electromagnetic valve arranged at or in the hydraulic block, brake pressure can be adjusted and / or wheel brake pressure in a hydraulic wheel brake connected to the hydraulic block by means of a brake line can be adjusted for slip regulation.

[0003] The known hydraulic aggregate booster piston is not received directly in the booster cylinder bore, but a cylindrical, closed at the end, bushing is pressed into the booster cylinder bore of the hydraulic block, in which the booster piston is received in an axially displaceable manner. The bushing protrudes from the hydraulic block on one side, that is to say it is overhanging, whereby the stroke of the booster piston is lengthened. SUMMARY

[0004] The hydraulic block according to the invention having the features of claim 1 is provided for a hydraulic aggregate of a hydraulic booster vehicle brake system, in particular with a slip regulation. The core piece of a hydraulic booster vehicle brake system with a slip regulation is a hydraulic aggregate with a hydraulic block, to which the hydraulic wheel brakes of the vehicle brake system are connected or connectable by means of brake lines. For manual actuation, the hydraulic block can likewise be connected or connectable to a main brake cylinder by means of brake lines, or the hydraulic block has a main brake cylinder bore.

[0005] The slip regulation, in particular the anti-lock brake regulation, the drive-slip regulation and / or the vehicle dynamics regulation, for which the abbreviations ABS, ASR and / or FDR are commonly used. The latter is also referred to as "anti-spin regulation" in colloquial language. The slip regulations are known and will not be described in detail here. The hydraulic aggregate serves for brake pressure generation with assistance and for brake pressure regulation.

[0006] The hydraulic block serves for mechanical fastening and hydraulic connection of the hydraulic structural elements of the vehicle brake equipment or of the slip regulation. These hydraulic structural elements are mainly solenoid valves, non-return valves, hydraulic accumulators, damping chambers, pressure sensors and brake pressure generators with assistance.

[0007] The brake pressure generator with assistance has a cylinder bore for the assistance piston in the hydraulic block. The assistance piston is also commonly referred to as plunger piston and the cylinder bore is referred to as plunger receptacle, plunger bore, plunger cylinder, etc. For pressure generation with assistance, the assistance piston of the brake pressure generator is moved electromechanically by means of an electric motor mounted outside the hydraulic block in the cylinder bore by means of a screw drive or another rotary / translation conversion drive, wherein a mechanical reduction gear, in particular a planetary gear, can be arranged between the electric motor and the screw drive.

[0008] The hydraulic structural elements are fastened in receptacles of the hydraulic block, which are usually configured as cylindrical through-holes or blind holes, partially with a diameter step. "Connection" means that the receptacles or the hydraulic structural elements fastened therein are connected by means of the lines in the hydraulic block according to the hydraulic circuit diagram of the vehicle brake equipment or of the slip regulation of the vehicle brake equipment. The lines are typically drilled in the hydraulic block. The cylinder bore and, if necessary, the master brake cylinder bore can likewise be drilled or made in a different way than drilling.

[0009] The hydraulic block constitutes a hydraulic aggregate with the hydraulic structural elements of the vehicle brake equipment or of the slip regulation of the vehicle brake equipment, wherein "equipment" means that the hydraulic structural elements are fastened in the respectively provided receptacles of the hydraulic block.

[0010] The hydraulic block according to the application having the features of claim 1 is cuboid-shaped and preferably drilled in the manner of a Cartesian coordinate system, in particular made of metal. "Drilled in the manner of a Cartesian coordinate system" means that the receptacles for the hydraulic structural elements and the lines connecting them are installed in the hydraulic block parallel and perpendicular to each other and to the faces and edges of the hydraulic block. Separate inclined receptacles and / or lines are possible.

[0011] The power cylinder bore is mounted in the side of the hydraulic block which is referred to as the motor side. The side in which the power cylinder bore opens is preferably a large side of the cuboid-shaped hydraulic block. The power cylinder bore has an anti-rotation guide for the power piston, which holds the power piston, which can be displaced in the power cylinder bore, in a rotationally fixed manner. The anti-rotation guide can for example have one or more anti-rotation ribs or anti-rotation grooves which extend axially parallel and on which or in which the power piston is supported in a rotationally fixed manner. Anti-rotation ribs or anti-rotation grooves which extend for example spirally are also conceivable.

[0012] In order to lengthen the stroke of the power piston, the hydraulic block according to the application has an extension at the opening of the power cylinder bore, into which the anti-rotation guide continues from the power cylinder bore.

[0013] The hydraulic block according to the application preferably also has an extension on the side opposite the opening of the power cylinder bore, into which the power cylinder bore extends, whereby the power cylinder bore is longer than the dimension of the hydraulic block in the direction of the power cylinder bore.

[0014] "Extension" is understood here as a bulge, a projection, a protrusion or the like on the side of the hydraulic block having the opening of the power cylinder bore and, if appropriate, on the opposite side. The extension protrudes from the cuboid shape of the hydraulic block.

[0015] One or more extensions according to the application make it possible to lengthen the power cylinder bore and to lengthen the stroke of the power piston, which is particularly advantageous or even necessary when the opening of the power cylinder bore is located in one of the two opposite large sides of the hydraulic block and the power cylinder bore extends in the direction of the short dimension of the hydraulic block.

[0016] The dependent claims are subject matter of the improvements and advantageous design solutions of the application explained in the independent claims.

[0017] All features disclosed in the specification and drawings are individually and in any combination possible in the embodiments of the application. Embodiments of the application having not all features of the claims or embodiments of the application, but only one or a plurality of features are in principle possible. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application is explained in more detail hereinafter on the basis of embodiments shown in the drawings.

[0019] In which:

[0020] Figure 1 A hydraulic block according to the application is shown in a perspective view looking towards the motor side;

[0021] Figure 2in a perspective view looking towards the opposite valve side shows the blank for the hydraulic block from Figure 1 ; and

[0022] Figure 3 in a perspective view looking towards the opposite valve side shows the blank for the hydraulic block from Figure 1 ; and Figure 1 ; and Figure 2 .

[0023] The drawings are simplified illustrations for explaining and understanding the present application. DETAILED DESCRIPTION

[0024] Figure 1 and Figure 2 The hydraulic block 1 according to the present application shown in Figs. 1 to 5 is provided for a not shown hydraulic aggregate of a not shown hydraulic booster vehicle brake arrangement with a slip regulation, in particular an anti-lock brake system, an anti-slip regulation and / or a vehicle dynamics regulation, for which the abbreviations ABS, ASR and / or FDR are commonly used. The hydraulic booster vehicle brake arrangement and the slip regulation are known and are not explained here.

[0025] The hydraulic block 1 according to the present application is a narrow, cuboid metal block, whose mutually opposite large sides are almost square. "Narrow" means that the distance of the two large sides is not greater than half the length or width of the large sides. In an embodiment, the distance of the two large sides from each other is about a quarter to a third of the length or width of the large sides of the hydraulic block 1. Further aspect ratios are possible.

[0026] The hydraulic block 1 is used for mechanical fastening and hydraulic connection of hydraulic structural elements, brake pressure generation with booster and brake pressure regulation during booster braking and / or slip regulation. Such hydraulic structural elements are in particular solenoid valves, check valves, hydraulic accumulators, hydraulic pumps and booster brake pressure generators 2. The hydraulic structural elements are fastened in receptacles in the hydraulic block 1. The receptacles are cylindrical depressions, blind holes and / or through-holes, which can have a diameter step, and into which the hydraulic structural elements are introduced and fastened pressure-tight, for example by a surrounding embossment. The hydraulic structural elements can be sunken in the receptacles or protrude from the hydraulic block 1. With the hydraulic structural elements, the hydraulic block 1 constitutes a hydraulic aggregate for the not shown hydraulic booster vehicle brake arrangement for booster brake pressure generation and brake pressure regulation.

[0027] A "hydraulic connection" means that the receptacles for the hydraulic structural elements are connected to one another in accordance with the hydraulic circuit diagram of the assisted vehicle brake equipment or of the slide adjustment of the assisted vehicle brake equipment by means of a line which leads through the hydraulic block 1. The receptacles and the line form a so-called "bore" of the hydraulic block 1, wherein the receptacles and the line can also be produced in a manner other than by boring.

[0028] The hydraulic block 1 according to the application has an assist cylinder bore 3 which passes through the hydraulic block 1 perpendicular to two opposite large sides of the hydraulic block 1. The assist cylinder bore 3 can be produced in a manner by boring or in a manner other than by boring. The assist cylinder bore 3 serves to displaceably receive an assist brake pressure generator 2 assist piston 4, also referred to as a plunger piston.

[0029] An electric motor 5 for driving, i.e. displacing, the assist piston 4 in the assist cylinder bore 3 is mounted coaxially to the assist cylinder bore 3 externally on a large side of the hydraulic block 1, into which the assist cylinder bore 3 opens, and which is referred to here as the motor side 6 of the hydraulic block 1. The electric motor 5 displaces the assist piston 4 onto a reduction gear and a screw gear. The reduction gear, which in the embodiment is a planetary gear, is arranged coaxially to the electric motor 5 and to the assist cylinder bore 3 in a motor housing of the electric motor 5 and is therefore not visible. The screw gear, which can also be understood as a rotation / translation conversion gear, is in the embodiment a threaded spindle drive, i.e. a ball screw drive. The screw gear is arranged partly in the motor housing of the electric motor 5 and partly in the assist piston 4 coaxially to the electric motor 5 and to the assist cylinder bore 3.

[0030] The assist piston 4 is in the embodiment a hollow piston of a column tube shape, whose closed end faces the bottom of the assist cylinder bore 3 and whose open end faces the electric motor 5.

[0031] A screw spindle 7 of the ball screw drive is arranged coaxially in the assist piston 5 and is rigidly connected to the piston bottom of the assist piston 5. A nut of the ball screw drive, which can be driven in rotation by the electric motor 5 via a planetary gear which is not visible in the drawing, is likewise located in the motor housing of the electric motor 5 and is not visible in the drawing.

[0032] The electric motor 5, the non-visible reduction gear / planetary gear, the screw gear of which only the screw spindle 7 is visible in the drawing, the assist piston 4 and the assist cylinder bore 3 form an assist brake pressure generator 2 for generating a hydraulic brake pressure for an assisted brake.

[0033] The power-assisted piston 4 has two radially outwardly projecting lugs 8 at opposite peripheral locations at its open, motor-facing end. The lugs 8 engage in anti-rotation grooves 9 which are installed axially parallel at opposite peripheral locations of the power cylinder bore 3 in the hydraulic block 1. The outwardly projecting lugs 8 of the power-assisted piston 4 and the anti-rotation grooves 9 constitute an anti-rotation guide 10 in the power cylinder bore 3 of the hydraulic block 1, which holds the power-assisted piston 4 anti-rotationally, that is to say in a manner resistant to rotation, when the planetary transmission, which constitutes the reduction gear, is driven in rotation and the helical transmission is driven in rotation. The number of two lugs 8 and two anti-rotation grooves 9 and / or their opposite arrangement is not mandatory for the invention. There can also be only one lug 8 and one anti-rotation groove 9 or more than two lugs 8 and more than two anti-rotation grooves 9, and / or the lugs 8 and anti-rotation grooves 9 can be arranged in a different manner than opposite one another on the periphery of the power-assisted piston 4 and the power cylinder bore 3 (not shown). Anti-rotation elements other than lugs 8 and anti-rotation grooves 9 can also be used as the anti-rotation guide 10 for the power-assisted piston 4 (not shown).

[0034] The anti-rotation grooves 9 open at the through-opening of the power cylinder bore 3 in the motor side 6. The hydraulic block 1 according to the invention has a protrusion 11 at the periphery of the power cylinder bore 3, into which the anti-rotation grooves 9 continue. The protrusions 11 are in the embodiment two journal pins with approximately parallelogram-shaped cross sections, whose inner surfaces are cylindrical hollow circles, and the cylindrical inner peripheral surface of the power cylinder bore 3 is continued without offset, interruption or other irregularities. The mutually facing surfaces of the journal pins which constitute the protrusion 11 likewise extend the groove flanks of the anti-rotation grooves 9 without offset, interruption or other irregularities. The journal pins which constitute the protrusion 11 extend the anti-rotation guide 10 of the power-assisted piston 4 beyond the motor side 6 of the hydraulic block 1 not only axially but also in rotation. The invention is not limited to the protrusions 11 shown and described, but further protrusions 11 can also be used to extend the anti-rotation guide 10 beyond the motor side 6 of the hydraulic block 1 (not shown).

[0035] Around the through-opening of the power cylinder bore 3, threaded holes are installed in the motor side 6 of the hydraulic block 1 for fastening the electric motor 6 with threaded elements 12.

[0036] Furthermore, a total of four blind holes are installed as brake line connections 15 in the motor side 6 of the hydraulic block 1 at the upper side 13 and at the adjacent narrow side 14 of the hydraulic block 1. The brake line connections 15 serve to connect a brake line, not shown, which leads to the hydraulic wheel brakes of the vehicle brake equipment. The connection to the brake line can be realized, for example, with a threaded bushing or a press-in bushing in so-called self-locking technology (not shown).

[0037] In the upper side 13, the hydraulic block 1 has three blind holes as connections 16 for a not shown brake fluid reservoir which is placed onto the upper side 13 of the hydraulic block 1 and has a connecting nipple at its bottom which reaches into the connections 16 when the brake fluid reservoir is placed onto the upper side 13 of the hydraulic block 1 and which has for example O-rings for its sealing in the connections 16.

[0038] In the large side opposite the motor side 6, here called valve side 17, the hydraulic block 1 according to the application has a blind hole as a receiving part 18 for a not shown solenoid valve of a sliding adjustment of a hydraulic booster vehicle brake equipment. Such a solenoid valve is for example an inlet valve, an outlet valve, a separation valve and an intake valve. The not shown solenoid valve is then introduced into the receiving part 18 so that the hydraulic part of the solenoid valve which constitutes the real valve is located in the receiving part 18 and is pressed there pressure-tightly. The valve dome in which the magnetic armature of the solenoid valve is located protrudes from the valve side 17 of the hydraulic block 1. The magnet coil is placed onto this valve dome (not shown).

[0039] The hydraulic block 1 has at its valve side 17 an overhang 19 into which the booster cylinder hole 3 extends so that the booster cylinder hole 3 is longer than the distance of the motor side 6 from the valve side 17. In general, due to the overhang 19, the booster cylinder hole 3 is longer than the distance of the side of the hydraulic block 1 into which the booster cylinder hole 3 opens from the side of the hydraulic block 1 which is opposite to this side. The overhang 19 is a bulge, a protrusion or the like at the valve side 17 of the hydraulic block 1. The overhang 19 can for example be cylindrical, square as in the embodiment or have another shape.

[0040] In the fastening side 20 of the hydraulic block 1 opposite the narrow side 14 and adjacent to the motor side 6, the valve side 17 and the upper side 13, a main brake cylinder hole 21 is installed (not shown) which is parallel to the upper side 13 and which completely or almost completely penetrates the hydraulic block 1. The main brake cylinder hole 21 is either embodied as a blind hole and thereby closed at the narrow side 14 of the hydraulic block 1 or as a through hole and pressure-tightly closed at the narrow side 14 of the hydraulic block 1 for example with a plug. Figure 2

[0041] ​The main brake cylinder bore 21 is provided for axially displaceably receiving two main brake cylinder pistons 22, 23 and two piston springs 24. One of the two main brake cylinder pistons 22 is a so-called primary piston or rod piston, which can be displaced in the main brake cylinder bore 21 by means of a piston rod by the primary piston or rod piston 22 being connected in a hinged manner to a brake pedal or possibly also to a hand brake lever by means of which the primary piston or rod piston 22 can be displaced by hand. The other main brake cylinder piston 23 is a so-called secondary piston or floating piston, which is displaced in the main brake cylinder bore 21 by means of a hydraulic pressure load by the primary piston or rod piston 22. The main brake cylinder bore 21 enables a manual actuation of a hydraulic power brake system.

[0042] It is provided that the hydraulic block 1, that is to say the hydraulic aggregate, of the brake pressure regulating portion and the solenoid valve and further structural elements and the power brake pressure generator 2 are fastened in the motor compartment (not shown) at the front bulkhead of the motor vehicle with the fastening side 20.

[0043] Figure 3 A blank 25 is shown, from which the hydraulic block 1 according to the application is produced, for example by machining, such as milling and / or drilling. The blank 25 is a workpiece from which the finished product, here the hydraulic block 1, is produced by machining or further machining. The blank 25 is manufactured in the embodiment by forming, that is to say by coining or extruding, from a metal, in the embodiment from an aluminium alloy, as an extruded profile, from which the blank 25 is separated by sawing or in another manner.

[0044] As can be seen in Figure 3 The blank 25 of the hydraulic block 1 has the shape of a cuboid, which has a rod-shaped protrusion 26 with a rectangular cross section on the large sides of the cuboid and likewise rod-shaped protrusions 27 with a rectangular cross section on the opposite large sides of the cuboid. One of the two protrusions 27 is wider and higher than the other protrusion 26, wherein the two protrusions 26, 27 cover each other as viewed perpendicularly to the large sides of the cuboid. The cross section of the blank 25 perpendicular to the protrusions 26, 27 is constant over the entire extension of the blank 25 in the longitudinal direction of the protrusions 26, 27.

[0045] The extension 19 of the power cylinder bore 3 on the valve side 17 is produced from the larger protrusion 27, and the journal of the anti-rotation guide 10, which constitutes the extension 11 on the motor side 6 of the hydraulic block 1, is produced from the smaller protrusion 26 in such a way that, in the embodiment, all parts which do not constitute the extensions 11, 19 are removed from the protrusions 26, 27 by machining.

[0046] By manufacturing the hydraulic block 1 from a blank 25 which has two rod-shaped protrusions 26, 27 with a rectangular cross section on the large side of the blank 25, the projections 11, 19 are integral components of the hydraulic block 1. It is also possible for one or both of the projections 11, 19 to be mounted at the hydraulic block 1 as initially separate components, for example by joining, for example materially, for example by welding, by forming, for example punching, or for example also by screwing.

Claims

1. A cuboid hydraulic block for use in the braking system of hydraulically assisted vehicles, wherein, The hydraulic block (1) has an assist cylinder bore (3) in the motor side (6) of the hydraulic block (1), which has an anti-rotation guide (10) for the assist piston (4), the anti-rotation guide holding the assist piston (4) that can be pushed in the assist cylinder bore (3) in a way that resists rotation. The hydraulic block (1) has a protrusion (11) at the opening of the booster cylinder hole (3), the protrusion extending the anti-rotation guide (10) beyond the motor side (6) of the hydraulic block (1).

2. The hydraulic block according to claim 1, characterized in that, The hydraulic block (1) has a protrusion (19) at the side (17) opposite to the motor side (6), and the booster cylinder bore (3) extends into the protrusion.

3. The hydraulic block according to claim 1 or 2, characterized in that, The protrusions (11, 19) are integral components of the hydraulic block (1).

4. The hydraulic block according to claim 1 or 2, characterized in that, The protrusions (11, 19) are installed at the hydraulic block (1).

5. The hydraulic block according to claim 1 or 2, characterized in that, The booster cylinder bore (3) extends along the direction of the minimum dimension of the hydraulic block (1).

6. The hydraulic block according to claim 1 or 2, characterized in that, The hydraulic block (1) has a main brake cylinder bore (21) and / or a receiving portion (18) for a solenoid valve.

7. A blank for a hydraulic block according to any one of claims 1 to 6, characterized in that, The blank (25) has a cuboid shape, and the cuboid has a rod-shaped protrusion (26) with a constant cross-section on the motor side (6), or has rod-shaped protrusions (26, 27) with a constant cross-section that are perpendicular to the motor side (6) and cover each other on the side (17) of the blank (25) opposite to the motor side (6).

8. The blank according to claim 7, characterized in that, The blank (25) is formed into a shaped bar with a constant cross-section by forming.

Images