Externally powered pressure device

Abstract

The invention relates to an externally powered pressure device (10) of a vehicle brake system, having a hydraulic unit (12) the housing (14) of which has a motor side (16) for joining a motor (18) which drives the pressure device (10) and a control device side (20), opposite the motor side (16), for joining a control device (22) which controls the motor (18), further having at least one cylinder (24), arranged in the housing (14), and a piston (26) guided axially displaceably in the cylinder (24), wherein an additional diversion unit (32) is allocated to the housing (14) such that at least one internal fluid line (34) of the housing (14) is in each case redirected by means of at least one respective fluid line (46) of the diversion unit (32) to at least one fluid port (36) of the diversion unit (32) such that the at least one fluid port (36) of the diversion unit (32) lies on the control device side (20) of the externally powered pressure device (10) and is axially oriented in the direction of the control device side (20).

Description

[0001] Description

[0002] title

[0003] External force pressure device

[0004] State of the art

[0005] The invention relates to an external force pressure device of a vehicle braking system, with a hydraulic unit, the housing of which has a motor side for applying a motor driving the external force pressure device and a control unit side opposite the motor side for applying a control unit regulating the motor, with at least one cylinder arranged in the housing and a piston guided axially displaceably in the cylinder.

[0006] Known vehicle braking systems are used in motor vehicles, such as motorcycles, cars, or trucks, to provide a controlled brake pressure to the corresponding wheel brakes, thus implementing slip control. The core of such controllable braking systems is a hydraulic unit with hydraulic components that are conventionally connected to a master brake cylinder. The master brake cylinder is operated by a driver using a pedal and thus originally serves to generate the brake pressure to the wheel brakes connected via brake lines. To regulate the brake pressure, hydraulic components controlled by a control unit are provided, such as electric hydraulic valves or solenoid valves, sensors, and a pressure device, usually operated by an electric motor.

[0007] In today's braking systems, especially brake-by-wire systems, an external power pressure device operated by the electric motor serves as the external power source for generating brake pressure at the wheel brakes. The brake pressure generated by the external power pressure device is transmitted to the wheel brakes via hydraulic or electromechanical actuators. In such a normal braking situation, the master brake cylinder is decoupled from the wheel brakes and serves only to detect the driver's braking request.

[0008] It is an object of the invention to provide an external force pressure device with which a particularly compact and cost-effective construction for pressure generation is created, which in particular can also be installed particularly flexibly.

[0009] Disclosure of the invention

[0010] The object is achieved with an external force pressure device according to the invention having the features of claim 1. Preferred embodiments are defined in the subclaims.

[0011] The external force pressure device of a vehicle braking system comprises a hydraulic unit whose housing has a motor side for connecting a motor driving the pressure device and a control unit side opposite the motor side for connecting a control unit regulating the motor. At least one cylinder arranged in the housing and a piston guided axially displaceably in the cylinder are provided. According to the invention, an additional deflection device is assigned to the housing, so that at least one internal fluid line of the housing is diverted by means of at least one respective fluid line of the deflection device to at least one respective fluid port of the deflection device, so that the at least one fluid port of the deflection device is located on the control unit side of the external force pressure device and is aligned axially towards the control unit side.

[0012] The cylinder preferably extends with its cylinder axis from the engine side to the control unit side, wherein a piston is preferably provided that is axially displaceably guided in the cylinder, the piston end face of which defines a cylinder chamber. According to the invention, the additional deflection device allows for a cost-effective and space-saving design that can be easily mounted in a vehicle, for example, on a vehicle bulkhead.

[0013] The solution according to the invention greatly improves the installation options for hydraulic systems for brake actuation, both spatially and in terms of the alignment and fluid connections of such hydraulic systems with the rest of the braking system. For example, in conventional hydraulic units, brake line outlets are located on the engine side of corresponding external force pressure devices. The invention also allows installation options on a vehicle firewall, as the position of the brake line outlets now permits this. Furthermore, vehicle architecture usually does not allow the engine to be aligned towards the center of the vehicle. The reasons for this include crash requirements, installation specifications, or intersections between the braking system and the vehicle body. This is particularly the case with right-hand drive vehicles. The solution according to the invention is now also suitable for this problem.

[0014] Although there have already been attempts to simplify installation in the vehicle using a so-called inverse system, i.e. one arranged laterally inverted, the necessary installation space for the brake lines is often not sufficient.

[0015] In general, it is possible according to the invention to align fluid ports on the housing towards the center of the vehicle, which also provides sufficient space for the installation of the brake lines.

[0016] A particularly compact design of the external force pressure device according to the invention is one in which the additional deflection device is an L-shaped extension as an integral part of the housing. The housing and the deflection device are thus formed as a single piece. This design is also particularly stable.

[0017] The additional deflection device of the external force pressure device according to the invention can preferably also be fastened to the housing by means of a fastening device such that the at least one internal fluid line of the housing is in fluid contact with the at least one fluid port of the deflection device via at least one fluid port of the housing and via at least one respective fluid connection port of the deflection device, and the at least one respective fluid line of the deflection device is in fluid contact with the at least one fluid port of the deflection device. In this case, the at least one fluid port of the housing is located on a different side of the external force pressure device and is oriented in a different direction than that of the at least one fluid port of the deflection device.

[0018] The additional deflection device can thus be designed as a separate component from the housing, serving as a kind of adapter with which the otherwise unmodified external force pressure device can be easily adapted to different installation situations. Safe operation is ensured by the fastening device. This fastening device is preferably a screw connection.

[0019] An embodiment of the invention is particularly preferred and reliable, wherein a seal is arranged in a sealing groove between the at least one fluid port of the housing and the at least one respective fluid connection port of the deflection device.

[0020] If the additional deflection device is designed as a separate adapter, a positioning device can preferably be provided by means of which the position of the additional deflection device relative to the housing can be determined. This positioning device preferably has a positioning projection that can be fitted into a positioning recess and can thus be designed, for example, as a bore in the housing with a pin of the deflection device fitting therein.

[0021] A particularly flexible design according to the invention can be achieved in which at least one respective brake fluid connection line is arranged between the at least one fluid port of the housing and the at least one respective fluid connection port of the additional deflection device. This allows for a particularly flexible and space-saving design, which is preferred according to the invention, particularly when the at least one fluid port of the housing is arranged on the engine side. Thus, the standardized fluid line routing is affected as little as possible, and a line test can be carried out particularly easily without further interventions or modifications to the overall vehicle brake system.

[0022] A further preferred embodiment of the external force pressure device according to the invention is particularly space-saving, in which the additional deflection device is arranged in an L-shape from the housing around the control unit.

[0023] A preferred embodiment of the external force pressure device according to the invention is particularly easily accessible for brake fluid lines of the further brake system to be connected, in which the at least one fluid port of the deflection device is arranged axially at least at the level of the control unit.

[0024] A preferred design of the externally powered pressure device according to the invention is particularly cost-effective to manufacture and particularly reliable and pressure-resistant, in which the at least one respective fluid line of the deflection device to the at least one fluid port of the deflection device is designed as a bore in the deflection device. The at least one internal fluid line of the housing can also preferably be designed as a bore in the housing.

[0025] According to the invention, at least one deflection to a fluid port of the deflection device up to approximately 8 such respective deflections to respective corresponding 8 such fluid ports of the deflection device are preferred.

[0026] The invention thus essentially offers an external force pressure device with a deflection device, which allows an arrangement of brake fluid lines of the further brake system in the area or on the

[0027] control unit side and thus offers simple and flexible installation.

[0028] Short description of the drawings

[0029] The invention is explained in more detail below with reference to the exemplary embodiments illustrated in the drawing. Figure 1 shows a schematic, partially sectioned side view of an external force pressure device with a deflection device according to a first embodiment of the invention;

[0030] Fig. 2 is a schematic, perspective and partially sectioned view of an external force pressure device with deflection device according to a second embodiment of the invention;

[0031] Fig. 3 is a schematic perspective view of the deflection device of the external force pressure device according to the second embodiment of the invention of Fig. 2;

[0032] Fig. 4 is a further schematic perspective view of the deflection device of the external force pressure device according to the second embodiment of the invention of Fig. 2;

[0033] Fig. 5 is a schematic, partially sectioned side view of an external force pressure device with deflection device according to a third embodiment of the invention; and

[0034] Fig. 6 is a schematic, partially sectioned side view of an external force pressure device with deflection device according to a fourth embodiment of the invention.

[0035] Embodiments of the invention

[0036] In general, the figures shown in the drawing show various preferred embodiments of the invention, wherein the same reference numerals also characterize the same elements of the invention and individual elements, even if not explicitly shown in all figures for reasons of clarity, apply to all embodiments of the invention as far as applicable.

[0037] The external force pressure device 10 shown with a hydraulic unit 12 is part of a vehicle braking system (not shown in the figures). A housing 14 of the hydraulic unit 12 has a motor side 16 for connecting a motor 18 driving the pressure device 10 and a control unit side 20 opposite the motor side 16 for connecting a control unit 22 regulating the motor 18. At least one cylinder 24 arranged in the housing 14 and a piston 26 guided axially displaceably in the cylinder 24 are provided, the piston end face 28 of which defines a cylinder chamber 30. This allows pressure to be built up or pumped around for brake hydraulic fluid.

[0038] According to the invention, an additional deflection device 32 is assigned to the housing 14, so that at least one internal fluid line 34 of the housing 14 is diverted by means of at least one respective fluid line 46 of the deflection device 32 to at least one fluid port 36 of the deflection device 32, so that the at least one fluid port 36 of the deflection device 32 is located on the control unit side 20 of the external force pressure device 10 and is axially aligned in the direction of the control unit side 20. According to the illustration in Fig. 1, for example, the inner fluid line 34 of the housing 14 forms a fluid connection with the cylinder chamber 30. Internal fluid lines 34 can, however, also lead, for example, as lines from or to a brake fluid reservoir 38. According to the illustration in Fig.In the embodiment of the invention shown in Fig. 1, the additional deflection device 32 is an L-shaped extension in the part of the housing 14 opposite the brake fluid reservoir 38, which is also assigned to the housing 14; in the illustration in Fig. 1, this is in the lower part of the housing 14. This additional deflection device 32, designed as an L-shaped extension, is thus an integral component of the housing 14, which offers particularly high stability. The housing 14 and the deflection device 32 are thus formed in one piece, as in the first embodiment of the invention shown in Fig. 1.

[0039] Additional fluid lines of the brake system (not shown in the figures) can be connected to the external force pressure device 10, in particular via the fluid ports 36 of the additional deflection device 32. The additional deflection device 32 allows for a particularly cost-effective and space-saving design, which can be easily mounted in a vehicle, for example, on a vehicle bulkhead (not shown in the figures).

[0040] It is particularly cost-effective to manufacture and at the same time particularly reliable and pressure-resistant if the respective fluid line 46 of the deflection device 32 to the at least one fluid port 36 of the deflection device 32 is designed as a bore in the deflection device 32, as shown in Fig. 1 and the following figures. The at least one internal fluid line 34 of the housing 14 can also preferably be designed as a bore in the housing 14. The bores can, for example, be designed as blind bores which meet at the angle of the desired deflection - in the illustration in Fig. 1, for example, at an angle of 90 degrees.

[0041] According to the invention, at least one deflection to a fluid port 36 of the deflection device 32 and up to approximately 8 such respective deflections to respective corresponding 8 such fluid ports 36 of the deflection device 32 are preferred.

[0042] According to the second preferred embodiment of the invention shown in Fig. 2, the additional deflection device 32 of the external force pressure device 10 according to the invention is designed as a separate component from the housing 14 and serves as a type of adapter with which the otherwise unchanged external force pressure device 10 can be easily adapted to different installation situations. This design as a separate component can also be found in the illustrations shown in the following Figs. 3 to 6.

[0043] According to the illustration in Fig. 2, the additional deflection device 32 can be fastened to the housing 14 by means of a fastening device 40 designed as a screw connection such that the at least one internal fluid line 34 of the housing 14 is in fluid contact with the at least one fluid port 36 of the deflection device 32 via at least one fluid port 42 of the housing 14 and via at least one respective fluid connection port 44 of the deflection device 32 and the at least one respective fluid line 46 of the deflection device 32. The at least one fluid port 42 of the housing 14 is located on a different side of the external force pressure device 10, namely in the illustration in Fig. 2 on a side opposite the brake fluid reservoir 38 (not shown in Fig. 2) on the underside of the housing 14, and in a different direction, namely in the illustration in Fig.2 downwards, compared to the position and orientation of the at least one fluid port 36 of the deflection device 32.

[0044] In Fig. 3 it can be clearly seen that for sealing between the at least one

[0045] Fluid port 42 of the housing 14 (not explicitly shown in Fig. 3) and the at least one respective fluid connection port 44 of the deflection device 32, a seal 52 is arranged in a sealing groove 54.

[0046] Further shown in Fig. 2, Fig. 3, and Fig. 4 is a positioning device by means of which the position of the additional deflection device 32 relative to the housing 14 can be determined. This positioning device preferably has a positioning projection 50 that can be fitted into a positioning recess 48 and can thus be designed, for example, as a bore in the housing 14 with a pin of the deflection device 32 fitting therein. Fig. 3 shows two such pins as the positioning projection 50, which then fit into corresponding bores as the positioning recess 48 in the housing 14 (not explicitly shown in Figs. 3 and 4).

[0047] The additional deflection device 32 shown in Fig. 2, Fig. 3 and Fig. 4 has 4 respective fluid connection ports 44 and fluid ports 36.

[0048] Fig. 5 shows an external force pressure device 10 with a deflection device 32, in which at least one respective brake fluid connection line 56 is arranged between the at least one fluid port 42 of the housing 14 and the at least one respective fluid connection port 44 of the additional deflection device 32. Fig. 5 shows two such brake fluid connection lines 56. According to the illustration in Fig. 5, the two fluid ports 42 of the housing 14 are arranged on the motor side 16. According to the illustration in Fig. 5, the at least one fluid port 36 of the deflection device 32 is further arranged axially at least at the level of the control unit 22, i.e., it is flush with the control unit or its housing cover, so that brake fluid lines of the additional braking system can be connected there in a particularly easily accessible manner (not shown in Fig. 5 for reasons of clarity).

[0049] The embodiment shown in Fig. 6 differs from the embodiment shown in Fig. 5 only in that the additional deflection device 32 is arranged in an L-shape guided from the housing 14 around the control unit 22.

Claims

Claims 1. External force pressure device (10) of a vehicle braking system, comprising a hydraulic unit (12), the housing (14) of which has a motor side (16) for connecting a motor (18) driving the pressure device (10) and a control unit side (20) opposite the motor side (16) for connecting a control unit (22) regulating the motor (18), comprising at least one cylinder (24) arranged in the housing (14) and a piston (26) guided axially displaceably in the cylinder (24), characterized in that an additional deflection device (32) is assigned to the housing (14), so that at least one internal fluid line (34) of the housing (14) is diverted to at least one fluid port (36) of the deflection device (32) by means of at least one respective fluid line (46) of the deflection device (32),so that the at least one fluid port (36) of the deflection device (32) is located on the control unit side (20) of the external force pressure device (10) and is axially aligned in the direction of the control unit side (20).

2. External force pressure device (10) according to claim 1, characterized in that the additional deflection device (32) is an L-shaped extension as an integral part of the housing (14).

3. External force pressure device (10) according to claim 1, characterized in that the additional deflection device (32) can be fastened to the housing (14) by means of a fastening device (40) in such a way that the at least one internal fluid line (34) of the housing (14) is in fluid contact with the at least one fluid port (36) of the deflection device (32) via at least one fluid port (42) of the housing (14) and via at least one respective fluid connection port (44) of the deflection device (32) and the at least one respective fluid line (46) of the deflection device (32), wherein the at least one fluid port (42) of the housing (14) is on another side of the external force printing device (10) and is oriented in a different direction than that of the at least one fluid port (36) of the deflection device (32).

4. External force pressure device (10) according to claim 3, characterized in that a seal (52) is arranged in a sealing groove (54) between the at least one fluid port (42) of the housing (14) and the at least one respective fluid connection port (44) of the deflection device (32).

5. External force pressure device (10) according to claim 3 or 4, characterized in that a positioning device (48, 50) is provided, by means of which the position of the additional deflection device (32) to the housing (14) can be fixed, wherein the positioning device (48, 50) has a positioning projection (50) which can be fitted into a positioning recess (48).

6. External force pressure device (10) according to one of claims 3 to 5, characterized in that at least one respective brake fluid connection line (56) is arranged between the at least one fluid port (42) of the housing (14) and the at least one respective fluid connection port (44) of the additional deflection device (32).

7. External force pressure device (10) according to one of claims 3 to 6, characterized in that at least one fluid port (42) of the housing (14) is arranged on the motor side (16).

8. External force pressure device (10) according to one of claims 3 to 7, characterized in that the additional deflection device (32) is arranged in an L-shape guided from the housing (14) around the control device (22).

9. External force pressure device (10) according to one of claims 1 to 8, characterized in that the at least one respective fluid line (46) of the deflection device (32) to the at least one fluid port (36) of the deflection device (32) is designed as a bore in the deflection device (32).

10. External force pressure device (10) according to one of claims 1 to 9, characterized in that the at least one fluid port (36) of the deflection device (32) is arranged axially at least at the level of the control device (22).

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