Hydraulic unit

Abstract

The invention relates to a hydraulic unit for a slip-controlled braking system, with a motor mounting bore (5) which opens eccentrically into the end face (7) of the mounting body (6), so that sufficient free space remains in the mounting body (6) between the motor mounting bore (5) and a side surface (1) in order to connect, in addition to the motor mounting bore (5), several valve mounting bores (8, 9) and a low-pressure storage chamber (15) connected to a pump bore (17) via pressure medium channels which are as easy to produce as possible.

Description

[0001] The invention relates to a hydraulic unit for a slip-controlled braking system, in particular for use in a motorcycle, according to the preamble of patent claim 1.

[0002] A hydraulic unit of the aforementioned type is already known from DE 10 2005 024 979 A1. The hydraulic unit consists of a block-shaped receiving body that accommodates inlet and outlet valves in several valve receiving bores of a first valve row for anti-lock control. Furthermore, a pump bore is arranged in the receiving body, which is aligned transversely to the opening of the valve receiving bores in the receiving body, with a motor receiving bore directed perpendicularly to the pump bore, and with several pressure medium channels connecting the valve receiving bores and the pump bore, which can establish a hydraulic connection between the brake pressure sensor connections opening into the receiving body and several wheel brake connections.The valve mounting holes and the motor mounting holes are located on opposite ends, which adversely affects the external dimensions of the hydraulic unit and the machining effort required for the mounting body. Such an arrangement of the motor mounting hole and valve mounting holes is also known from documents DE 103 39 882 A1, DE 198 05 843 A1, and WO 02 / 042 134 A1.

[0003] The object of the invention is to produce a hydraulic unit of the specified type with the least possible construction effort and in the smallest possible size.

[0004] This object is achieved for a hydraulic unit of the specified type with the characterizing features of claim 1.

[0005] Further features and advantages of the invention are explained below with reference to the description of an embodiment with reference to several drawings.

[0006] They show: Fig. 1 a receiving body intended for the hydraulic unit in a perspective view with a view of the front face and the side surfaces of the receiving body provided with the leakage chamber, the low-pressure storage chamber and the pump bore, Fig. 2 the receiving body Fig. 1 in a perspective view rotated 90 degrees clockwise around the vertical axis, Fig. 3 the receiving body closed with a cap with a longitudinal section through the motor mounting bore.

[0007] The Fig. 1, Fig. 2 show, as a component of a hydraulic unit used for slip-controlled motorcycle brake systems, a block-shaped receiving body 6, into the end face 7 of which a first valve receiving bore 8 for an electromagnetically actuated inlet valve and a second valve receiving bore 9 for an electromagnetically actuated outlet valve open. Furthermore, a pump bore 17 is arranged in the receiving body 6, which is directed transversely to the opening direction below the two valve receiving bores 8, 9 into a first side surface 1 of the receiving body 6. To accommodate an electric motor, a motor receiving bore 5 is directed perpendicular to the pump bore 17 into the end face 7. Furthermore, the receiving body 6 has a plurality of pressure medium channels 11, 12, 13 which interact with the valve receiving bores 8, 9 and the pump bore 17 and are arranged between a brake pressure sensor connection 18 opening into the receiving body 6 and a wheel brake connection 10.

[0008] In order to create a receiving body 6 that is as compact as possible from the point of view of the simplest possible hydraulic connection of all of the mentioned bores, chambers and pressure medium channels, the invention provides that the motor receiving bore 5 opens eccentrically into the end face 7 of the receiving body 6, so that sufficient free space remains in the receiving body 6 between the motor receiving bore 5 and the first side surface 1 in order to integrate the valve receiving bores 8, 9, as well as the low-pressure storage chamber 15 connected to the pump bore 17 in addition to the motor receiving bore 5 and to connect them hydraulically to one another as simply as possible.Therefore, the motor mounting bore 5 opens directly next to a second side surface 2 of the receiving body 6 and is thus located in a border position on the outer edge of the second side surface 2 receiving the wheel brake connection, so that a sufficiently large distance for the integration of the two valve mounting bores 8, 9 in the end face 7 of the receiving body 6 is ensured between the motor mounting bore 5 and the first side surface 1 located diametrically opposite the second side surface 2.

[0009] As further evidenced by the Fig. 1, Fig. 2, the motor mounting bore 5 opens into the end face 7 not only directly next to the second side surface, but also off-center, directly next to a third side surface 3 of the mounting body 6, the third side surface 3 being arranged between the first and second side surfaces 1, 2, so that in order to accommodate a first pressure medium channel 11 leading to the wheel brake connection 10, there is a sufficiently large distance between the motor mounting bore 5 and a fourth side surface 4 in the mounting body 6 arranged diametrically to the third side surface 3, which distance corresponds at least to the required diameter of the pressure medium channel 11 and the diameter of the wheel brake connection 10.

[0010] The two valve receiving bores 8, 9 arranged in a linear valve row X are aligned at a short distance parallel to the first side surface 1. The two valve receiving bores 8, 9 are penetrated by a second pressure medium channel 12 running parallel to the first side surface 1, which opens into the first pressure medium channel 11 leading to the wheel brake connection 10. Advantageously, the second pressure medium channel 12 linearly penetrating the valve receiving bores 8, 9 opens perpendicularly into the first pressure medium channel 11 running linearly to the wheel brake connection 10, so that both pressure medium channels 11, 12 are aligned at right angles to one another in the block-shaped receiving body 6 for the purpose of simplifying production as much as possible.Both pressure medium channels 11, 12 can thus be produced efficiently in connection with the wheel brake connection 10 by means of a drilling tool inserted into the second and third side surfaces 2, 3, wherein after removing the drilling tool from the second pressure medium channel 12, only a closure body 26 has to be pressed into its outlet opening.

[0011] According to the Fig. 1, Fig. 2, the pump bore 17 in the receiving body 6 extends transversely to the valve row X below the two valve receiving bores 8, 9 from the first side surface 1 into the motor receiving bore 5, in each case at an identical radial position to the two valve receiving bores 8, 9, such that the pump bore 17 is advantageously connected via an extremely short pump suction connection 14 to a low-pressure storage chamber 15 which opens into the fourth side surface 4 and which extends as a blind bore below the second pressure medium channel 12 to just before the second valve receiving bore 9 in the receiving body 6 which receives the electromagnetically actuated outlet valve.The low-pressure storage chamber 15 is thereby advantageously connected particularly simply to the second valve receiving bore 9 via a short angled channel 16, wherein the angled channel 16 is produced by a first drilling operation in the bottom of the low-pressure storage chamber 15 and by a further drilling operation in the bottom of the second valve receiving bore 9.

[0012] Furthermore, the Fig. 1 shows the arrangement of a leakage chamber 19 to be closed with a lid, which opens into the fourth side surface 4 as a blind bore parallel to the low-pressure storage chamber 15, the leakage chamber 19 extending below the first pressure medium channel 11 into the motor mounting bore 5 connected to the pump bore 17.

[0013] This makes it possible to store the leakage chamber 19 in the event of a pump leak at any time, in which, with reference to the Fig. 3 preferably a particularly storage-capable sponge 25 is used.

[0014] According to the view in Fig. 2, a third pressure medium channel 13 extends at a short distance from the third side surface 3 between the pump bore 17 and the third side surface 3, specifically starting below the first valve receiving bore 8 up to the brake pressure sensor connection 18 opening into the second side surface 2, which opens into the third pressure medium channel 13 in alignment with the vertical axis of the first valve receiving bore 8 in order to achieve a linear course of the third pressure medium channel 13 that is as simple as possible to produce.Both the brake pressure sensor connection 18 and the associated pressure medium channel 13 can thus be realized in an automated manner with identical tool alignment by a single drilling operation in the form of a stepped blind bore, with the special feature that with simple manufacturing measures the third pressure medium channel 13 is branched off below the first valve receiving bore 8 in the direction of the bottom of the first valve receiving bore 8 and in the direction of the outer surface of the pump bore 17, so that a simple hydraulic connection of the first valve receiving bore 8 with the brake pressure sensor connection 18 and with the pump bore 17 is established.To form the hydraulic connection between the third pressure medium channel 13 and the first valve receiving bore 8, only a short depression in the bottom of the first valve receiving bore 8 is required, while the connection between the third pressure medium channel 13 and the first valve receiving bore 8 and the pump bore 17 is achieved by inserting a drilling tool into the third side surface 3, for which purpose the drilling tool first cuts the third pressure medium channel 13 and the vertical channel depression in the first valve receiving bore 8 before the drilling tool enters the outer surface of the pump bore 17. After removing the drilling tool, the borehole leading linearly to the pump bore 17 can be closed cost-effectively by means of a closure body 26 pressed into the third side surface, analogous to the sealing of the second pressure medium channel 12 at the borehole inlet.

[0015] As can be seen from the summary of the Fig. 1, Fig. 2, the pump bore 17 and the motor mounting bore 5 and thus, to a certain extent, also the two valve mounting bores 8, 9 are advantageously arranged between the pressure medium channel 13 leading to the brake pressure sensor connection 18 and the pressure medium channel 11 leading to the wheel brake connection 10, so that efficient use is made of the volume available in the mounting body 6, in that the pressure medium channels 11, 13 belonging to the brake pressure sensor connection 18 and the wheel brake connection 10 are arranged parallel to the pump bore 17 in order to achieve a uniform connection pattern for the brake pressure sensor connection 18 and for the wheel brake connection 10 on a single side surface 2.

[0016] Finally, in reference to the Fig. 1, Fig. 2 out Fig. 3 shows an overall view of the hydraulic unit in a longitudinal section, from which it can be seen that for the positive and / or non-positive fixing of a cap 20 placed on the end face 7 of the receiving body 6 on the receiving body 6, at least two diametrical side surfaces 3, 4 with preferably groove-shaped recesses 21 (see also Fig. 1, Fig. 2), into which engage several locking hooks 24 attached to the cap 20. The seal 22 between the cap 20 and the receiving body 6 is achieved, for example, by means of silicone, wherein the cap 20 is provided with a moisture-impermeable membrane 23 for ventilation of the interior. List of reference symbols 1 side surface 2 side surfaces 3 side surface 4 side surface 5 Motor mounting hole 6 receiving bodies 7 Frontal surface 8 valve mounting hole 9 Valve mounting hole 10 Wheel brake connection 11 Pressure medium channel 12 Pressure medium channel 13 Pressure medium channel 14 Pump suction connection 15 Low-pressure storage chamber 16 angle channel 17 Pump bore 18 Brake pressure sensor connection 19 Leakage chamber 20 cap 21 Recess 22 Sealing 23 Membran 24 locking hooks 25 sponge 26 locking bodies

Claims

[1] Hydraulic unit for a slip-controlled braking system, - with an end face (7) on a block-shaped receiving body (6), into which a first valve receiving bore (8) for an inlet valve and into which a second valve receiving bore (9) for an outlet valve open, - with a pump bore (17) arranged in the receiving body (6), which is directed transversely to the direction in which the valve receiving bores (8, 9) open into a first side surface (1) of a receiving body (6), - with a motor mounting bore (5) for an electric motor, which is directed perpendicular to the pump bore (17) into the end face (7), into which the two valve mounting bores (8, 9) open, - with a plurality of pressure medium channels (11, 12, 13) connecting the valve receiving bores (8, 9) and the pump bore (17), which are connected to a brake pressure sensor connection (18) opening into the receiving body (6) and to a wheel brake connection (10),characterized by that the motor mounting bore (5) opens into the end face (7) of the mounting body (6) off-center, directly next to a second side face (2) of the mounting body (6), and that the two valve mounting bores (8, 9) open into the end face (7) between the motor mounting bore (5) and the first side face (1) located diametrically opposite the second side face (2). [2] Hydraulic unit according to claim 1, characterized byin that the motor mounting bore (5) opens into the end face (7) off-center, directly next to a third side surface (3) of the mounting body (6), the third side surface (3) being arranged between the first and second side surfaces (1, 2), so that in order to accommodate a first pressure medium channel (11) leading to the wheel brake connection (10), there is a distance between the motor mounting bore (5) and a fourth side surface (4) in the mounting body (6), which is arranged diametrically to the third side surface (3), which distance corresponds at least to the diameter of the wheel brake connection (10) opening into the second side surface (2). [3] Hydraulic unit according to claim 1 or 2, characterized bythat the two valve receiving bores (8, 9) arranged in a valve row (X) are aligned parallel to the first side surface (1), which are penetrated by a second pressure medium channel (12) running parallel to the first side surface (1) and opening into the first pressure medium channel (11) leading to the wheel brake connection (10). [4] Hydraulic unit according to claim 3, characterized by that the second pressure medium channel (12) which linearly penetrates the valve receiving bores (8, 9) opens perpendicularly into the first pressure medium channel (11) which runs linearly to the wheel brake connection (10), so that both pressure medium channels (11, 12) are aligned at right angles to one another in the block-shaped receiving body (6). [5] Hydraulic unit according to one of the preceding claims, characterized bythat the pump bore (17) extends transversely to the valve row (X) below the two valve receiving bores (8, 9) from the first side surface (1) into the motor receiving bore (5), wherein the pump bore (17) is connected via a pump suction connection (14) to a low-pressure storage chamber (15) which opens into the fourth side surface (4) and which extends below the second pressure medium channel (12) up to the second valve receiving bore (9) which receives the outlet valve. [6] Hydraulic unit according to claim 5, characterized by that the low-pressure storage chamber (15) is connected to the second valve receiving bore (9) via an angled channel (16), wherein the angled channel (16) is produced by a first drilling operation in the bottom of the low-pressure storage chamber (15) and by a further drilling operation in the bottom of the second valve receiving bore (9). [7] Hydraulic unit according to claim 2, characterized bythat a third pressure medium channel (13) extends parallel to the third side surface (3), starting below the first valve receiving bore (8) up to the brake pressure sensor connection (18) opening into the second side surface (2), which opens into the second side surface (2) in alignment with the vertical axis of the first valve receiving bore (8) for the purpose of a linear course of the third pressure medium channel (13). [8] Hydraulic unit according to claim 7, characterized by that the third pressure medium channel (13) is branched off below the first valve receiving bore (8) in the direction of the bottom of the first valve receiving bore (8) and in the direction of the outer surface of the pump bore (17), so that a short hydraulic connection of the first valve receiving bore (8) with the brake pressure sensor connection (18) and also with the pump bore (17) is established. [9] Hydraulic unit according to one of the preceding claims, characterized bythat a leakage chamber (19) opens into the fourth side surface (4) parallel to the low-pressure storage chamber (15), which leakage chamber extends below the first pressure medium channel (11) into the motor mounting bore (5) connected to the pump bore (17). [10] Hydraulic unit according to claim 1, characterized by that the pump bore (17) and the motor mounting bore (5) are arranged between the pressure medium channel (13) leading to the brake pressure sensor connection (18) and the pressure medium channel (11) leading to the wheel brake connection (10). [11] Hydraulic unit according to claim 1, characterized by that the pressure medium channel (13) leading to the brake pressure sensor connection (18) and the pressure medium channel (11) leading to the wheel brake connection (10) are each arranged in the receiving body (6) parallel to the pump bore (17). [12] Hydraulic unit according to one of the preceding claims, characterized byin that for the positive and / or non-positive fixing of a cap (20) which can be placed on the end face (7) of the receiving body (6), at least two diametrical side surfaces (3, 4) are provided with preferably groove-shaped recesses (21) on the receiving body (6), into which a plurality of locking hooks attached to the cap (20) can be brought into engagement.

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