DE10053991A1 - Pump insert for vehicle brake system has pumps and drive element connected to motor with hydraulic fluid suction and pressure bores, arrangement sealing insert fluid-tight from unit housing - Google Patents

Abstract

The pump insert has at least two pumps (1,2) and a drive element (11) for the pumps that is connected to a motor with suction and pressure bores for a hydraulic fluid and an arrangement that seals the pump insert fluid-tight with respect to the housing of the hydraulic unit. The insert has a multi-part housing (3-5) in which two hydraulic pumps are arranged. Independent claims are also included for the following: a hydraulic unit for a vehicle brake system.

Description

The invention relates to a pump insert for a hydraulic unit and a hydraulic unit with one Pump insert of a vehicle brake system.

In today's motor vehicles, as a rule electronically controlled, anti-lock braking systems used. With these braking systems, the turning behavior of the individual wheels measured by wheel speed sensors, by an electronic control unit evaluated and in accordance with of the turning behavior is the brake pressure in the individual Modulated wheel brakes. With a hydraulic brake system a hydraulic unit is used for pressure modulation, in particular an electromechanical pressure control device that the commands of the electronic control unit implemented and over Intake and exhaust valves the pressures in the wheel brakes controls. The pressure control device is at least one pump assigned. With an "only" anti-lock brake system with an anti-lock braking system (ABS) the height of the In principle, forms are specified solely by the driver. at Brake systems with traction control (ASR) or An Electronic Stability Program (ESP) can be implemented through the Pump also actively built up without driver influence become. The electromechanical pressure control device points next to the solenoid valves usually have memory to reduce pressure absorb suddenly occurring brake fluid volume. In addition to the pressure build-up in the ESP and ASR, the pump serves to Empty brake calipers and memory and not in the ABS case  brake fluid required for a control cycle in the To return the master cylinder.

There are also hydraulic brake systems for motor vehicles known in which pumps are arranged to by the Driver built up pressure in the master brake cylinder In the event of normal braking to be reinforced (optimized hydraulic brake (OHB)) or a driver brake request build up appropriate brake pressure (electrohydraulic Brake (EMS). Brake systems with an optimized Hydraulic brakes are especially for motor vehicles suitable, in which the previously used regularly Vacuum boosters cannot be used effectively enough, for example due to their considerable space requirement or due to insufficient vacuum in modern Vehicle engines. Generated by the electro-hydraulic brake the electromechanical pressure control unit the braking energy according to the specifications of the electronic control unit, which (by wire) from driver input and others Sensor signals determined, the brake actuation by a pedal feeling simulator with driver request detection he follows. The pump can be used as a brake system Energy amplifier (OHB) or as the sole energy supplier (EMS) work.

It is the object of the present invention, one Pump insert and a hydraulic unit one To provide the vehicle brake system that is easy in the Vehicle brake system can be integrated and is reliable and comfortable pressure application and pressure control allows.

This object is achieved by the characterizing Features of the independent claims solved.  

Particularly advantageous embodiments of the invention are shown in specified in the subclaims.

It is essential for the invention that the pump insert has at least two pumps that the pump insert Drive element, in particular one of the at least two pumps common shaft, for which has at least two pumps, that the pump insert with a preferably substantially outside a housing of the hydraulic unit arranged motor, in particular an electric motor, is connectable that the pump insert suction and Has pressure holes for a hydraulic fluid, and that the pump insert means, preferably an elastic Material, which has the pump insert, especially in Area of the suction and pressure holes, fluid-tight against the Seal the housing of the hydraulic unit.

The pump insert has the advantage of a light one Integrability in the hydraulic unit of the Vehicle brake system on, being a compact design of the hydraulic unit enables. At the same time it is possible to Pump insert as a complete module regardless of the Manufacture of the hydraulic unit to manufacture and in If necessary, insert what into the hydraulic unit is technically advantageous.

According to the invention it is provided that the pump insert has a multi-part housing in which two hydraulic Pumps are arranged. So can be beneficial in any of two brake circuits of the vehicle two independent of each other Pumps are integrated.

According to the invention it is provided that the housing is a first Has housing part in which a first pump is arranged, and has a second housing part in which a second Pump is arranged, and has a central housing part, essentially between the first and the second  Housing part is arranged and thereby the first housing part and the second housing part can be connected.

This enables the complete module of the pump insert technically relatively simple and inexpensive to manufacture become.

In an embodiment of the invention, the pump insert advantageously tapered, wherein stepped sections of the pump insert into corresponding stepped counter sections of the housing of the hydraulic Unit can intervene. So is an insertion of the Pump slots and a fluid-tight seal technically relatively simple and effective.

According to the pump insert closes in its Hydraulic unit housing installed in essentially with at least part of the surface of the Housing flush from and on this essentially flat surface the motor can be used to drive the pumps or with this connectable. This makes it easy to install the Engine possible.

Two gear pumps are preferred as pumps, particularly advantageously used two internal gear pumps. The usage of two internal gear pumps has the advantage that a relative high brake pressure and at the same time a quick build-up of pressure can be achieved, in particular a relatively quiet and low-pulsation running of the pumps a comfortable Ensure operation. In addition, these pumps have a relative great reliability. Preferably the two are Internal gear pumps of the same size. For special ones However, it is also possible to use them differently great training and a different performance of the two To provide gear pumps.

It is provided according to the invention that the housing Middle part by mechanical shaping or forming,  especially curling or bending, certain sections of the first and second housing part with the first and second Housing part is connectable. Such a simple one can be advantageous Install the pump insert.

According to the pump insert has two pumps, the cooperate with the hydraulic unit so that the first pump part of a first hydraulic brake circuit Vehicle brake system and the second pump part of a second hydraulic brake circuit of the vehicle brake system is.

The pump insert according to the invention is in principle for everyone hydraulic brake systems can be used. But it did found that the pump insert according to the invention is particularly suitable for vehicle brake systems in which an amplification of the driver by means of the Master cylinder applied pressure or the Pressure generation itself by the pumps, preferably by each an internal gear pump for each brake circuit during the normal operation is provided (OHB or EHB). Just in the event of a total loss of pressure generation by the pumps the braking force can only be achieved through muscle strength of the driver. Because the pumps here for one Reinforcing the pressure are responsible in particular Internal gear pumps preferred because of their relatively quiet and low pulsation run.

The object underlying the invention is further achieved by solved a hydraulic unit of a vehicle brake system, in which the housing has a recess for receiving of the pump insert according to the invention.

According to the invention, the recess is step-shaped trained, preferably a step-shaped Drilling.  

According to the invention, the housing of the hydraulic Unit has at least two inlet holes that over Suction holes of the pump insert with the suction side of one Pump connected to the pump drawer, and that Housing has at least two drain holes that over Pressure bores of the pump unit with the pressure side of one Pump connected to the pump drawer, and that Housing preferably has at least one ventilation hole on. This ventilation hole in particular has one Safety function: If at least one pump is leaking, see above brake fluid escapes here. On the one hand, this is one Leakage of a pump can be recognized and on the other hand the Separation of two, each assigned to a pump Brake circuits even in the event of two leaking pumps maintained.

It is provided according to the invention that a first Inlet bore with a first outlet valve of a first one Wheel brake in a first brake circuit, preferably via a first intermediate low pressure accumulator, and with a second exhaust valve of a second wheel brake in the first brake circuit, preferably over the first intermediate low-pressure accumulator, in connection stands that a second inlet bore with a third Exhaust valve of a third wheel brake in a second Brake circuit, preferably via a second intermediate low pressure accumulator, and with a fourth exhaust valve of a fourth wheel brake in the second Brake circuit, preferably over the second intermediate low-pressure accumulator, in connection stands that a first drain hole with a first Inlet valve of the first wheel brake and with a second Inlet valve of the second wheel brake in the first brake circuit, preferably via a first interposed Damping chamber, communicates, and that a second Drain hole with a third inlet valve of the third Wheel brake and with a fourth inlet valve the fourth  Wheel brake in the second brake circuit, preferably via a second intermediate damping chamber, in connection stands.

It is provided in the sense of the invention that the first and second wheel brake of a front axle of the vehicle and the third and fourth wheel brakes of a rear axle of the vehicle are assigned (black and white division) or that the first and third wheel brake of a front axle of the vehicle and the second and fourth wheel brakes of a rear axle of the vehicle are assigned (diagonal division).

The hydraulic unit is preferably a hydromechanical pressure control device (hydraulic block or hydraulic unit) of a wheel slip-controlled hydraulic automotive brake system.

It is provided according to the invention that the brake pressure in the brake system in the service brake case essentially with Using the at least two pumps in the pump insert is amplified or generated (OHB).

The invention will in the following with reference to several illustrations (Figs. 1 to Fig. 6) will be explained in greater detail.

Fig. 1 shows an embodiment of the pump insert according to the invention in the installed state in a hydraulic unit of a vehicle brake system in cross section.

FIG. 2 shows the embodiment of the pump insert shown in FIG. 1 in a top view.

Fig. 3 shows the pump unit in a second plan view.

In FIG. 4 is a perspective view of an embodiment of the hydraulic unit is shown.

FIG. 5 shows another perspective view of the hydraulic unit shown in FIG. 4.

Fig. 6 shows a hydraulic circuit diagram of a brake system in which an inventive pump unit is used in a hydraulic unit according to the invention.

The embodiment of the pump insert shown in FIG. 1 has two internal gear pumps 1 , 2 , which are arranged in a three-part housing ( 3 , 4 , 5 ). The first internal gear pump 1 is arranged in a first housing part 3 ; The second internal gear pump 2 is arranged in a second housing part 5 . The first and second housing parts 3 , 5 are connected by a central housing part 4 . In this cross-section, bores that lie outside the cutting plane are also partially placed in the cutting plane for reasons of clarity.

The first housing part 3 has a recess 6 , in which a first pinion 7 and a first ring gear 8 of the first gear pump 1 are arranged, which have intermeshing teeth. The ring gear is rotatably supported via a first bushing or bearing bush 9 and here via a subsequent first ring 10 , in particular a compensation ring. The first pinion 7 has disks 15 , 16 , in particular so-called axial disks, sealingly abutting on the end faces of the toothing. It is driven by a pinion shaft 11 , which is rotatably mounted in a liner 12 and a bearing body 13 , in particular a liner. The shaft 11 has a recess 14 , in particular a bore, into which a motor (not shown here) can engage in order to drive the pinion shaft 11 . The bore 14 serves to center a shaft of the motor. By means of a driver profile 57 , in which a corresponding counterpart of the shaft of the motor can engage, the pinion shaft 11 can be taken along and thus driven by the motor.

Just like the first gear pump 1 , the second gear pump 2 is designed . In a second recess 17 of a second housing part 5 , a second pinion 18 and a second ring gear 19 are arranged, which have intermeshing teeth. The second ring gear 19 is rotatably mounted via a second bushing or bearing bush 20 and here via a subsequent second ring 21 , in particular a compensation ring. Discs 22 , 23 , in particular so-called axial discs, are arranged on the end face of the second pinion 18 . The second pinion gear 18 is also driven via the pinion shaft 11 and, for example, ally by means of teeth 44 with the pinion shaft. 11 Furthermore, sealing rings 24 , 25 , 26 are arranged sealingly on the pinion shaft.

The first housing part 3 and the second housing part 5 have rolled-up areas 27 , 28 , as a result of which these housing parts 3 , 5 are connected to the central housing part 4 . Without a screw connection, a secure and tight connection of the housing parts 3 , 4 , 5 to a complete pump insert can thus advantageously be made possible.

The pumps are sealed in a fluid-tight manner by means of the seals 29-34 in the region of inlet bores 35 , 36 and in the region of outlet bores 39 , 40 . In the first housing part 3 and the second housing part 5 there are pressure bores 37 , 38 which establish a connection from the pressure area of the pumps 1 , 2 to the outlet bores 39 , 40 , and suction bores 49 , 50 which connect the suction area of the pumps to the inlet bores 35 , 36 produce, provided. Furthermore, the pump insert has a ventilation bore 41 , for ventilation and for leakage. The middle housing part 4 is also sealed in a fluid-tight manner with respect to the first and second housing parts 3 , 5 by means of seals 42 , 43 .

Fig. 2 shows the pump insert shown in Fig. 1 in a plan view. The same components are provided with the same reference numbers here and in the following figures. The pinion 7 and the ring gear 8 are mounted eccentrically relative to one another. The teeth of the pinion 7 and the ring gear 8 mesh with one another in such a way that the teeth of the pinion 7 fully engage in the tooth gaps of the ring gear 8 in one position, while in another position they emerge completely from the tooth gaps of the ring gear 8 . When the pinion 1 rotates in the direction of the arrow, the tooth space that becomes free increases, starting from the full engagement of the pinion toothing on the right of the dividing line A, until the dividing line A is exceeded again (pinion position in FIG. 2 above), as a result of which a suction chamber is located on the right of the dividing line is formed. To the left of the dividing line A, the free space between the teeth gradually decreases again, so that a pressure space is formed. The relevant structure and the mode of operation of an internal gear pump are well known and therefore do not require any further, separate explanation.

In Fig. 3 is a second plan view is shown on a pump unit. The disc 15 is designed such that a defined pressure field is established and a defined suction area is formed, the pressurized fluid being discharged through three pressure openings 45 and via the pressure bore 37 and through the suction bore 35 , a suction opening 46 and a suction recess 58 is sucked into the housing. A “lower” disk 16 is arranged analogously to the “upper” disk 15 in accordance with FIG. 1. Such panes are known per se and do not require any further explanation. For the design and operation of such washers, so-called axial washers, reference is made to EP 0 848 165 A2, to which reference is expressly made here.

In FIG. 4 and FIG. 5 are perspective views of a hydraulic unit 47 are shown with built-in pump unit 48th The bores and other components such as valves, hydraulic chambers and pressure sensors of the hydraulic unit 47 are only shown for a first of two brake circuits in FIG. 4 and for the second brake circuit in FIG. 5 for reasons of clarity. In principle, both brake circuits are constructed analogously, which is why they are described together below. The suction holes 49, 50 of the pump insert 48 are via the corresponding inlet bores 35, 36 of the hydraulic unit 47 and low pressure reservoir 51, 52 in conjunction with outlet valves 53-56; the pressure bores 37 , 38 of the pump insert 48 are connected to inlet valves 61-64 via the corresponding drain bores 39 , 40 of the hydraulic unit 47 and via damping chambers 59 , 60. The valves 53-56 and 61-64 are connected by wheel connections 65-68 connected to the individual wheel brakes of the vehicle. The master cylinder is connected via connections 69 , 70 and changeover valves 73 , 74 and via the inlet bores 35 , 36 to the suction bores 49 , 50 of the pump insert 48 and to the wheel brakes via isolating valves 71 , 72 and via the inlet valves 61-64 . In addition, 47 are arranged in the hydraulic unit 47 pressure sensors 75-78 and cable channels 89 , 90 , which are used to lead cables through the hydraulic unit 47 . This hydraulic unit 47 is suitable in connection with the pump insert 48 and a corresponding electronic control unit for brake systems with ABS, ASR or ESP.

In FIG. 6, a hydraulic circuit is shown with an inventive hydraulic unit 47 which comprises a pump unit 48 with two internal gear pumps 1, 2. ., The matching with the Figures 4 and 5 components are here - as said before - provided with the same reference numerals and need not be repeated explanation, the switching position of the valves is shown here for the currentless state. The inlet valves 61-64 and isolating valves 71 , 72 are therefore normally open (SO) valves and ensure that the wheel brakes 84-87 are acted upon by the pressure from the master cylinder 79 in the event of a failure of the electronic control or the pumps 1 , 2 or one Motors 88 for operating the pumps 1 , 2 . The outlet valves 53-56 and the changeover valves 73 , 74 are normally closed (SG) valves. In addition, the master cylinder 79 with the brake fluid reservoir 80 is shown here. The master cylinder 79 is actuated by the actuation pedal 81 and during braking the valves are switched so that the pressure in the lines 82 , 83 can be increased by the pumps 1 , 2 and the wheel brakes 84-87 are acted upon by the increased pressure can. In the event of an ABS or ASR or ESP brake intervention, the valves are switched accordingly and the motor 88 is controlled in accordance with the well known methods. For example, in the case of an ESP or TCS mode in which the vehicle brake system automatically builds up a certain brake pressure (without driver specification), brake fluid is sucked out of the container 80 via the master cylinder 79 . For this purpose, the suction bores 49 , 50 of the pump insert 48 are connected to the connections 69 , 70 of the hydraulic unit on the master cylinder 79 via the inlet bores 35 , 36 and the changeover valves 73 , 74 . In the case of ABS braking, the pumps 1 , 2 are supplied with a pre-pressure via the low-pressure accumulators 51 , 52 , which comes from the temporarily opened outlet valves 53-56 of the wheel brakes 84-87 .

LIST OF REFERENCE NUMBERS

1

first internal gear pump

2

second internal gear pump

3

first housing part

4

Central housing part

5

second housing part

6

Recess of the first housing part

7

first sprocket

8th

first ring gear

9

first liner

10

first ring

11

pinion shaft

12

liner

13

bearing body

14

Extending the shaft

15

.

16

slices

17

Recess of the second housing part

18

second sprocket

19

second ring gear

20

second liner

21

second ring

22

.

23

slices

24-26

seals

27

.

28

rolled up areas

29-34

seals

35

.

36

supply boreholes

37

.

38

pressure bores

39

.

40

drain holes

41

ventilation opening

42

.

43

seals

44

gearing

45

pressure ports

46

suction opening

47

hydraulic unit

48

pump unit

49

.

50

suction bores

51

.

52

Low-pressure accumulator

53-56

exhaust valves

57

driver profile

58

suction cavity

59

.

60

damping chambers

61-64

intake valves

65-68

wheel fittings

69

.

70

Master cylinder connections

71

.

72

isolation valves

73

.

74

switchover

75-78

pressure sensors

79

master cylinder

80

Brake fluid reservoir

81

operating pedal

82

.

83

cables

84-87

wheel brakes

88

pump motor

89

.

90

cable channels

Claims (17)

Pump insert ( 48 ) for a hydraulic unit ( 47 ) of a vehicle brake system, which has at least two pumps ( 1 , 2 ), which has a drive element ( 11 ) for the at least two ( 1 , 2 ) pumps, which is equipped with a motor ( 88 ), which has suction and pressure bores ( 37 , 38 , 49 , 50 ) for a hydraulic fluid, and which has means which seal the pump insert ( 48 ) in a fluid-tight manner against the housing of the hydraulic unit ( 47 ). 2. Pump insert according to claim 1, characterized in that the pump insert ( 48 ) has a multi-part housing ( 3 , 4 , 5 ) in which two hydraulic pumps ( 1 , 2 ) are arranged. 3. Pump insert according to claim 2, characterized in that the housing has a first housing part ( 3 ) in which a first pump ( 1 ) is arranged, and has a second housing part ( 5 ) in which a second pump ( 2 ) is arranged and has a central housing part ( 4 ) which is arranged essentially between the first ( 3 ) and the second ( 5 ) housing part and whereby the first housing part ( 3 ) and the second ( 5 ) housing part can be connected. 4. Pump insert according to one of claims 1 to 3, characterized in that the pump insert ( 48 ) is designed tapered, and that step-shaped sections of the pump insert ( 48 ) can engage in corresponding step-shaped counter sections of the housing of the hydraulic unit ( 47 ). 5. Pump insert according to one of claims 1 to 4, characterized in that the pump insert ( 48 ) in its in the housing of the hydraulic unit ( 47 ) installed condition is substantially flush with at least a part of the surface of the housing and that this essentially flat surface of the motor ( 88 ) for driving the pumps ( 1 , 2 ) can be placed or connected to the latter. 6. Pump insert according to one of claims 1 to 5, characterized in that the pumps ( 1 , 2 ) are two gear pumps, preferably two internal gear pumps. 7. Pump insert according to one of claims 3 to 6, characterized in that the central housing part ( 4 ) by mechanical deformation or shaping, in particular rolling or bending, certain sections of the first ( 3 ) and second ( 5 ) housing part with the first and second housing part is connectable. 8. Pump insert according to one of claims 1 to 7, characterized in that the pump insert ( 48 ) has two pumps ( 1 , 2 ) which cooperate with the hydraulic unit ( 47 ) such that the first pump ( 1 ) is part of a first hydraulic brake circuit of the vehicle brake system and the second pump ( 2 ) is part of a second hydraulic brake circuit of the vehicle brake system. 9. Pump insert according to one of claims 1 to 8, characterized in that by means of the at least two pumps ( 1 , 2 ) of the pump insert ( 48 ) in the event of a service brake, substantially the brake pressure in the brake system is increased or generated. 10. Hydraulic unit of a vehicle brake system, characterized in that the housing of the hydraulic unit ( 47 ) has a recess for receiving a pump insert ( 48 ) according to one of claims 1 to 9. 11. Hydraulic unit according to claim 10, characterized in that the recess is stepped. 12. Hydraulic unit according to claim 10 or 11, characterized in that the housing of the hydraulic unit ( 47 ) has at least two inlet bores ( 35 , 36 ) via suction bores ( 49 , 50 ) of the pump insert ( 48 ) with the suction side of a pump ( 1 , 2 ) of the pump insert ( 48 ) are connected, and have at least two drain bores ( 39 , 40 ) which are connected to the pressure side of a pump ( 1 , 2 ) of the pump insert via pressure bores ( 37 , 38 ) of the pump insert ( 48 ) ( 48 ) are connected, and preferably have at least one ventilation hole ( 41 ), for ventilation of the at least two pumps ( 1 , 2 ) of the pump insert ( 48 ). 13. Hydraulic unit according to claim 12, characterized in
that a first inlet bore ( 35 ) with a first outlet valve ( 53 ) of a first wheel brake ( 84 ) in a first brake circuit, preferably via a first intermediate low-pressure accumulator ( 51 ), and with a second outlet valve ( 54 ) of a second wheel brake ( 85 ) in is connected to the first brake circuit, preferably via the first intermediate low-pressure accumulator ( 51 ),
that a second inlet bore ( 36 ) with a third outlet valve ( 55 ) of a third wheel brake ( 86 ) in a second brake circuit, preferably via a second intermediate low-pressure accumulator ( 52 ), and with a fourth outlet valve ( 56 ) of a fourth wheel brake ( 87 ) in is connected to the second brake circuit, preferably via the second intermediate low-pressure accumulator ( 52 ),
that a first drain hole ( 49 ) with a first inlet valve ( 61 ) of the first wheel brake ( 84 ) and with a second inlet valve ( 62 ) of the second wheel brake ( 85 ) in the first brake circuit, preferably via a first intermediate damping chamber ( 59 ), in Connection is established
and that a second drain hole ( 50 ) with a third inlet valve ( 63 ) of the third wheel brake ( 86 ) and with a fourth inlet valve ( 64 ) of the fourth wheel brake ( 87 ) in the second brake circuit, preferably via a second intermediate damping chamber ( 60 ), communicates. 14. Hydraulic unit according to claim 13, characterized in that the first ( 84 ) and second wheel brake ( 85 ) are assigned to a front axle of the vehicle and the third ( 86 ) and fourth ( 87 ) wheel brake are assigned to a rear axle of the vehicle. 15. Hydraulic unit according to claim 13, characterized in that the first ( 84 ) and third ( 86 ) wheel brakes of a front axle of the vehicle and the second ( 85 ) and fourth ( 87 ) wheel brakes of a rear axle of the vehicle are assigned. 16. Hydraulic unit according to one of claims 10 to 15, characterized in that the hydraulic unit ( 47 ) is a hydromechanical pressure control device of a wheel slip-controlled motor vehicle brake system. 17. Hydraulic unit according to one of claims 10 to 16, characterized in that the brake pressure in the brake system in the service braking case is substantially increased or generated with the aid of the at least two pumps ( 1 , 2 ) of the pump insert ( 48 ).