JP2002225702A - Pressure medium accumulator for vehicle brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure medium accumulator capable of being assembled easily and promptly with a hydraulic module and the accumulator press-fitted by modifying a conventional pressure medium accumulator for an automotive brake device, in which a pressure medium accumulator 11 is connected to a hydraulic module 23 of a brake device and has an accumulator casing 30 divided into two compartments separated from each other by a partition element 31 and sealed by a closing cover 32 and a closing element 33, the partition element 31 being surrounded by a guide ring 36. SOLUTION: In this pressure medium accumulator, the accumulator casing 30 and the hydraulic module 23 are connected to each other shapely by connecting elements 41, 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a pressure medium accumulator for a brake device of an automobile, wherein the pressure medium accumulator is connected to a hydraulic module of the brake device.
The pressure medium pressure accumulator has a pressure accumulator housing, which is divided into two chambers separated from each other by a partition element, the pressure accumulator housing being sealed by a closing cover and a closing element. , Wherein the partition element is surrounded by a guide ring.

The invention further relates to a method for splicing a hydraulic module of a brake system for a vehicle with a pressure medium accumulator.

[0003]

BACKGROUND OF THE INVENTION Whether in a passenger car, utility vehicle or rail vehicle, the brake system of these vehicles is designed to prevent, on the one hand, wetness which lowers the boiling point of the brake fluid from entering the brake system, and In terms of surface, it is designed to withstand high peak pressure generated by impact. In addition, it is guaranteed that the vehicle will be stopped by muscular strength when a part of the brake device breaks down. An accumulator for damping the pulsations in the brake device is used for damping the pressure oscillations in the conduit system of the brake device, which accumulator is tightly received in the hydraulic unit of the brake device.

[0004] DE 198 334 A1
No. 10 relates to a hydraulic actuation control unit for a motor vehicle brake system. A pump is provided which is activated by an electronic control unit and supplies hydraulic fluid under pressure, which pump prepares the hydraulic fluid for at least one braking device connected to the vehicle wheel. On the inlet side of the pump a first reservoir for hydraulic fluid without pressure is arranged correspondingly, on the other side the outlet side of the pump is associated with a reservoir for hydraulic fluid under pressure. It is arranged. The pump, the first reservoir and the second reservoir are arranged as an electro-hydraulic unit in one common casing.

[0005] German Patent Publication No. 1990068
No. 00 relates to an accumulator unit for a braking device. A bellows arranged in the accumulator casing is surrounded by a guide ring, which is supported on the inner wall of the accumulator casing. The accumulator casing has a threaded portion, by means of which the accumulator casing is screwed into the upper part of the hydraulic unit. According to this, it is necessary to rotate the pressure medium accumulator casing relative to the hydraulic module during the splicing process, which causes difficulties due to the installation space. On the other hand, it is also very difficult to apply a tool, so that the tightening torque cannot be precisely defined and applied to the thread.

[0006] EP-A-0 980 981 discloses in particular a pressure medium accumulator which is used in a slip-controlled brake system for motor vehicles. The pressure medium accumulator has a housing with a pressure medium connection and a valve element for opening or closing the pressure medium connection. A spring element fixed to the end face of the bellows is provided in the pressure medium accumulator. This spring element cooperates with the valve element facing the pressure medium connection. In the housing, there is received an object which is movably arranged and separates at least two chambers in the pressure medium accumulator from one another and which is formed as a movable bellows surrounding the first chamber. And in that case,
The chamber surrounded by the bellows is filled with gas. Between the end face of the bellows and the end face of the housing, there is provided a stop which limits the closing stroke of the valve element in the direction of the pressure medium connection, in which case the valve element is moved relative to the spring element. It is arranged to be able to exercise.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to improve a pressure medium accumulator and eliminate the disadvantages mentioned above.

[0008]

According to the invention, the pressure accumulator casing and the hydraulic module are positively connected to one another by connecting elements.

According to another aspect of the present invention, a connecting element is press-fitted into an accumulator casing, and a pre-assembled component group including a sealing element, a partition element, and a guide ring is formed. The component group consisting of the coupling element and the accumulator housing is inserted into the accumulator housing and is pressed into the hydraulic module of the brake device.

[0010]

An advantage of the present invention is that the pressure medium accumulator which has a metal bellows and performs pulsation damping is mounted on the hydraulic module in a cost-effective manner. Assembly is self-clinch (Self-Clin)
By means of a connecting element in the form of a bolt of the form ch), a simple and quick press-fit of the components to be seamed takes place. This coupling element, which is received in a form-locking manner on the housing of the pressure-medium accumulator and also on the hydraulic unit, i.e., on the basis of its shape, is a damping connection due to its rigid and inflexible wall. Acts as a member. The condition in which the casing of the pressure accumulator is form-locked to the hydraulic module is thereby eliminated, and unauthorized access to the pressure accumulator, which is essential for safety, is essential to the brake parts. Being eliminated provides additional advantageous security.

The seal between the accumulator and the hydraulic module is made via metal components, so that no elastomer is required as a sealing material. Elastomers no longer provide the original sealing properties after a defined service life due to embrittlement phenomena. Seals made of pure metal materials are not subject to the aging phenomenon.

According to the solution proposed by the invention, a simple and quick assembly by press-fitting the hydraulic module and the accumulator is achieved. A pre-assembled accumulator component consisting of a metal bellows, a closure or cover arranged on both sides and a plastic guide ring is likewise produced by press-fitting. After assembly, the accumulator casing can be pressurized by gas filling one of the chambers formed in the accumulator casing.

The bolt-shaped connecting element between the accumulator housing and the hydraulic module can be provided with a simple through-bore. Furthermore, the configuration of this component with an inflow system and an outflow system is also possible, so that a separation of the incoming brake fluid from the outgoing brake fluid is provided. In the last-mentioned embodiment, a bolt-shaped connecting element can be provided with a double connection to the hydraulic module.

The plastic deformation of the material of the accumulator casing and of the hydraulic module by the press is constituted by a permanent positive connection which ensures that the connection between the accumulator casing and the hydraulic module, which is crucial for safety, is prevented. This allows the parts to be positively connected to one another.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows the basic construction of a brake system for a motor vehicle, in which all components of the brake system are indicated by simplified symbols.

The brake system of a vehicle mainly comprises two modules, an operation control module 10 and a hydraulic module 23, and these modules are shown in FIG. 1 as main components. Through the brake pedal 2,
A piston rod 4 connected to a movable piston 5 is slid in the master brake cylinder 3. The reservoir 6 ensures that the master brake cylinder 3 receives a sufficient supply of storage medium. The master brake cylinder 3 is followed by two 2-port 2-position directional control valves 7, 8 which can be formed, for example, as magnet valves, which can occupy a shut-off position and an open position. And is loaded by a spring element. The first two-port two-position directional control valve 7 is connected to a piston cylinder device 9.

The operation control unit 10 and the hydraulic module 23 are connected to each other via the hydraulic conduit of the second 2-port 2-position control valve 8. Hydraulic module 23
A pressure medium pressure accumulator is provided in an upper region of the pressure medium accumulator, of which only the pressure accumulator casing 30 is shown. The pressure medium accumulator and the hydraulic module 23 are connected to one another in a compact manner via a schematically illustrated connection element 41. In the brake system, a bellows, generally made of metal, is housed in a pressure medium accumulator, which forms a closed chamber in the accumulator casing 30 which is loaded with gas under pressure. I have.
When the pump 16 discharges, the pressure pulsations enter the pressure medium accumulator 11 via the coupling element 41 and are damped in the pressure medium accumulator, so that there is very little pressure oscillation in the hydraulic module 23 or the conduit system. Does not occur.

The hydraulic module 23 of the brake system according to FIG. 1 is assigned a reservoir 12 which is connected via a conduit 19 to a group of magnet valves 20 formed as a multi-directional control valve. . A conduit extending from the pressure medium accumulator 11 to the valve device;
A relief valve 13 is arranged between the pump and a conduit 15 extending from the pump.

The brake fluid generated on the inlet side 15 of the pump 16 is raised by the pump 16 to a relatively high pressure generated on the outlet side 17 of the pump 16. A check valve 18 is arranged on the outlet side 17 of the pump 16, via which the high-pressure brake fluid is supplied to a group of magnet valves 20 formed as multi-directional control valves.
The magnet valve group 20 includes an inlet valve 14a and an outlet valve 14b. Through this magnet valve group 20, the separation cylinder 21 is applied by the high pressure formed at the outlet side of the pump 16 in the hydraulic module 23 according to the switching position of the magnet valve group 20, and as a result, the separation cylinder 21
The corresponding wheel brake cylinder device 22 can be pressurized via.

When a part of the hydraulic module 23 fails, the first two-port two-position directional control valve 8
Via the conduit extending to the separation cylinder 21 of the third, it is ensured that the wheel brake cylinder device 22 of the vehicle can be operated via the pedal force 2 acting on the master brake cylinder 3.

FIG. 2 shows a first embodiment of the coupling element between the accumulator and the hydraulic module of the vehicle brake system in detail.

FIG. 2A shows a pressure accumulator casing 30 of a pressure medium pressure accumulator 11 for a vehicle brake system, in which a metal bellows functioning as a partition element 31 is shown. Is inserted. The metal bellows is fixed to the closing cover 32 at one end surface. This closure cover 32 has holes 3
4 are formed, which can be closed by means of a spherically shaped closing element 33. Closure cover 32
Through the hole 34, the inside of the metal bellows 31 functioning as a partition element is applied with pressure by the filling gas. In the configuration of FIG. 2, the closing cover 32 is inserted into an annular groove provided in the pressure accumulator casing 30 with a surface protruding laterally. Further, the O-ring 35 is provided on the closing cover 32.
A correspondingly arranged sealing element. A cover 37 is fixed to a lower side of the metal bellows 31 functioning as the partition element 31.
Since this cover is regarded as the bottom of the accumulator casing inner chamber formed by the bellows 31 and the closing cover 32, it is also referred to as a bottom plate hereinafter. Bottom plate 37 and bellows 3
Arranged between the side wall 1 and a guide ring 36 which surrounds the metal bellows 31, is connected to the accumulator casing 3 of the pressure medium accumulator formed according to the invention.
0 can slide along the inner wall. A seal element 38 is provided below the bottom plate 37.

In the bottom of the accumulator casing 30, a part of a bolt-shaped coupling element 41 is press-fitted, which is located in the area opposite the support shoulder of the hydraulic module 23. It is press-fitted into the upper region 39. In the center of the bolt-shaped coupling element 41, a through-hole 42 is provided, which serves as an inlet and an outlet for the brake fluid whose pulsation is to be damped in the accumulator housing 30. . Through the through-holes 42 capable of applying pressure in both directions of the bolt-shaped coupling element 41, the brake fluid flows into the chamber restricted by the inner wall of the accumulator casing 30 and the outer wall of the bellows 31 which is internally pressurized. enter.

FIG. 2b shows a detail of the coupling element 41 which is formed as a bolt and lies between the accumulator housing 30 and the upper region 39 of the hydraulic module 23.

Bolt-shaped connecting element 41
A support shoulder 43 extending annularly is formed at a substantially central portion in the longitudinal direction of the outer wall. As can be seen from FIG. 2b, this support shoulder 43 is bounded on both sides by an annular groove 44 formed in the outer wall of the bolt-shaped coupling element 41. Coupling element 4 to accumulator casing 30 and casing of hydraulic module 23
1 is press-fitted, an annular groove 4 is provided in the outer wall of the bolt-shaped coupling element 41 in the circumferential direction.
4, a plastically deformable material 45 or 46 enters the bottom of the accumulator casing 3 and the upper region 39 of the hydraulic module 23 of a bolt-shaped coupling element 41 with a through-hole 42. Connect to both sides.
Due to the gap between the upper region 39 of the hydraulic module 23 and the lower side of the accumulator housing 30 corresponding to the height of the supporting shoulder 43, access for the disengagement of the form-locking connection is not possible. It is not possible, so that the pressure medium accumulator, which serves to dampen the pulsation of the pressure oscillations, is prevented from being disconnected from the hydraulic module 23, or its inconvenient replacement, not by a person skilled in the art.

In the embodiment of the coupling element 41 between the accumulator casing 30 and the hydraulic module 23 shown in FIGS. 2A and 2B, the accumulator casing 3
0 is preferably formed as an extruded part of a soft metal material, for example aluminum. This is advantageous for providing an interference fit between the material of the accumulator housing and the annular groove 44 of the bolt-shaped coupling element 41. A pre-assembled component group consisting of a closing cover 32, a bellows 31, an O-ring 35, a guide ring 36, a bottom plate 37 and a sealing element 38 is connected to an upper part of a bolt-shaped coupling element 41. Can be press-fitted into the bottom of the accumulator casing 30 and then inserted into the pot-shaped accumulator casing 30.
The component group consisting of the pre-assembled pressure medium accumulator and the connection element 41 press-fitted in its bottom is then press-fitted into the hydraulic module 23, resulting in a bolt-shaped connection An annular groove 44 formed in the outer wall of the element 41 is filled with a plastically deformable material 46 of the hydraulic module 23. This ensures a positive connection with the bottom of the pressure accumulator housing 30 on the upper side and with the upper region 39 of the hydraulic module 23 on the lower side via a bolt-shaped connecting element 41. Is done.

As shown in FIG. 2B, the supporting shoulder 43
Is formed in the annular wall 44 of the coupling element.
7 can be formed at various depths according to the thickness.

FIG. 3 shows another embodiment of the coupling element of the brake device between the hydraulic module with separate inlet and outlet ports and the pressure medium accumulator. I have.

The pressure medium accumulator shown in FIG.
Similar to the pre-assembled pressure medium accumulator shown in FIG. 2A, an accumulator casing 30, a metal bellows 31 received therein, and a closure cover 32 with a filling gas opening 34. , Sealing element 35 and bottom plate 3
7, a guide ring 36 and a sealing element 38 received in a bottom plate 37.

Unlike the embodiment shown in FIG. 2, the embodiment shown in FIG. 3 has a system of divided holes 50, 49 in which the bolt-shaped coupling element 48 is divided.

At the end of the stroke of the metal bellows 31, a sealing element 38 separates the accumulator chamber from the holes 49 or 50. The holes 49 and 50 communicate with each other via a gap S (see FIG. 2C).

Bolt-shaped connecting element 48
An inflow hole 49 and an outflow hole 50 extend spatially separated from each other in the hydraulic module 23 of FIG. In FIG. 3, an inflow hole 49 formed in the hydraulic module 23 opens into the through hole 42 of the bolt-shaped coupling element 48, and an outflow hole 50 formed in the coupling element 48 on the other surface. Communicates with a hole 50 provided on the outflow side of the hydraulic module 23 and spatially separated from the inflow hole 49.

FIG. 3 (b) shows the bolt-shaped coupling element 48 shown in FIG. 3 (a) in detail. Via the bore 49 of the hydraulic module 23 the brake fluid flows into the through-hole 42 of the bolt-shaped coupling element 48. Through this through-hole 42, the brake fluid flows towards the sealing element 38 arranged on the bottom plate 37 of the bellows 31 and, when the pressure is correspondingly formed, opens the sealing element, so that pressure is applied from the inside. The pressure pulsation in the brake fluid can be damped between the outside of the metal bellows 31 and the inside of the pressure accumulator casing 30.

On the outflow side, the brake fluid flows out of the interior of the accumulator housing 30 via an outlet hole 50 provided parallel to the bolt-shaped coupling element 48.
The brake fluid which has flowed out through the openings 53 arranged corresponding to each of the two holes 50 extending in the bolt-shaped coupling element 48 flows into the holes 50 of the liquid module 23.

The spatial separation of the two fluid streams is maintained by a partition wall 51 formed between both outlet holes 50 and through holes 49 in the bolt-shaped coupling element. 2b, the support shoulder 43 of the connecting element 48 is
7 is formed as a thick portion. Annular support shoulder 43
Are provided on both sides with an annular cut, that is to say an annular groove 44, which is filled with the material of the bottom of the accumulator casing 30 or the material of the hydraulic module 23. Below the bolt-shaped coupling element 48, two annular grooves 44 are provided in the region of the coupling element 48 that is received in the hydraulic module 23. The first annular groove 44 has an annular support shoulder 43.
Of the second annular groove 44 on the other side.
In the lower part of the coupling element 48
Is located below the outflow hole 50. Coupling element 4
The annular groove 44 provided on the peripheral surface of the hydraulic module 8 is filled with the plastically deformed material 48 of the hydraulic module 23 at the time of the interference fit between the lower part of the bolt-shaped coupling element and the hydraulic module. The partitioning of the inflow-side hole arrangement from the side-hole arrangement 50 is ensured by the arrangement proposed according to the invention of the connection points 44, 46 or 44, 52, which form a positive connection in two positions.

At the critical joints between the coupling elements 41 or 48 and the accumulator casing 30 or the upper part of the hydraulic module 23, instead of using a conventional elastomeric material, the upper part of the hydraulic module 23 is now During the press-fitting of the accumulator housing 30 or the press-fitting of the coupling element 48 therein, the sealing effect is obtained by the plastic deformation of the relatively soft material aluminum. Without breaking, this form connection cannot be re-established, resulting in a permanent connection in which unauthorized access or operation is not possible. Unauthorized replacement of safety-critical components, such as, for example, automotive brake systems, is prohibited.

The invention further relates to a method for joining a hydraulic module and a pressure medium accumulator. First, a pressure accumulator casing 30, which is preferably made of a soft metal material such as aluminum, is produced by an extrusion press. The upper region of the bolt-shaped coupling element 41 or 48 is pressed into the bottom of the pressure accumulator casing 30. Then, a component group consisting of a metal bellows 31, a closing cover 32 having a hole 34 and a closing element 33, a sealing element 35, and a bottom plate 37 having a guide ring 36 slidable inside the casing is provided. It is assembled to the accumulator casing 30. This pre-assembled component group is mounted in the accumulator casing 30 by, for example, a welding or deformation process.

Thereafter, this group of components, consisting of the accumulator housing with the built-in part and the press-fit connection elements 41 or 48, is pressed at one or two places where a positive connection takes place by press-fitting. It fits tightly in the upper region 39 of the module 23. After this assembling, the gas filling of the interior of the metal bellows 31 takes place via a hole 34 provided for this purpose in the closing cover, after which the hole is closed by the closing element 33.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic structure of a brake device of an automobile.

FIG. 2 shows a first embodiment of the invention between an accumulator and a hydraulic module;
FIG. 4 is a view showing a coupling element according to the embodiment.

FIG. 3 shows a second embodiment of the invention between an accumulator and a hydraulic module;
FIG. 5 shows a connecting element with an inflow hole and an outflow hole which are separated from one another in an embodiment.

[Explanation of symbols]

Reference Signs List 1 brake device, 2 brake pedal, 3 master brake cylinder, 4 piston rod, 5 piston, 6 reservoir, 7 first 2 port 2 position directional control valve, 8 second 2 port 2 position directional control valve,
Reference Signs List 9 piston cylinder unit, 10 operation control unit, 11 pressure accumulator, 12 reservoir, 13 relief valve, 14 valve device, 15 inlet side, 16 high pressure pump, 17 outlet side, 18 check valve, 19 conduit, 20 multi-directional control valve , 21 Separation cylinder (T
rennyzinder), 22 wheel brake cylinder, 23 hydraulic module, 30 accumulator casing, 31 partition element (bellows), 3
2 closure cover, 33 closure element, 34 holes,
35 seal, 36 guide ring, 37 cover (bottom plate), 38 seal plate (seal element), 3
9 upper area of hydraulic module, 40 holes, 41 connecting elements, 42 through holes, 43 support shoulders, 4
4 annular groove, 45 material of accumulator casing, 46
Material of the hydraulic module, 47 walls, 48 coupling elements with inlets and outlets, 49 inlets,
50 outlet hole, 51 partition wall, 52 different connection points (casing material), 53 opening

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Harald Otto Germany Leonberg Schiller Strasse 49 (72) Inventor Horst Behring Germany Ludwigsburg Feichinger Strasse 11 F-term (reference) 3D049 BB22 BB34 CC02 HH12 HH13 LL01 NN01 QQ04 3H086 AA27 AB03 AD07 AD15 AD35

Claims (11)

[Claims] 1. A pressure medium accumulator for a brake device of a motor vehicle, the pressure medium accumulator (11) being connected to a hydraulic module (23) of the brake device, and comprising a pressure medium accumulator (11). ) Has a pressure accumulator casing (30), said pressure accumulator casing being a partition element (31).
Divided into two chambers separated from each other by
The accumulator casing (30) is sealed by a closing cover (32) and a closing element (33), and the partition element (31) is surrounded by a guide ring (36). 30. A pressure medium accumulator for a vehicle brake system, characterized in that the hydraulic pressure module (30) and the hydraulic module (23) are positively connected to one another by connecting elements (41, 48). 2. The pressure medium accumulator according to claim 1, wherein an annular support shoulder (43) is provided on the outer wall of the coupling element (41, 48). 3. The pressure medium accumulator according to claim 1, wherein an annular groove (44) is formed in the outer wall of the coupling element (41, 48). 4. A coupling element (41, 48) having a through hole (42) for inflow and outflow for brake fluid.
The pressure medium accumulator according to claim 1, comprising: 5. An annular groove (44) in the seam area of the outer wall of the coupling element (41, 48) with the accumulator casing (30), and one annular groove (44) in the hydraulic module Element (41, 4) with (23)
5. The pressure-medium accumulator according to claim 4, wherein the pressure-medium accumulator is located in the joining region of (8). 6. An annular groove (44) for connecting the coupling element (4).
4. The pressure medium accumulator according to claim 3, wherein the pressure medium accumulator is formed on both sides of the support shoulder (43) when viewed in the axial direction of (1, 48). 7. Separated holes (42, 49) for connecting the brake fluid to the pressure medium accumulator and for guiding the brake fluid out of the pressure medium accumulator are provided in the coupling elements (41, 48). , 50) are provided.
A pressure medium accumulator according to claim 1. 8. The casing material (52, 46) in which the inflow guide hole (49) and the outflow guide hole (50) in the hydraulic module (23) enter into the annular groove (44) of the coupling element (48). The pressure medium accumulator according to claim 7, which is separated by 9. The part of the connecting element (41, 48) fixed in the hydraulic module (23) has a positively connecting point (44, 46; 44, 52) on the outlet side of the conduit. 9. The pressure medium accumulator according to claim 8, wherein the pressure medium accumulator is adapted to seal (50, 53). 10. The pressure medium accumulator according to claim 1, wherein the partition element (31) in the accumulator housing (30) is formed as a metal bellows, a piston or a diaphragm. 11. A method for splicing a hydraulic module (23) of a braking device for a vehicle with a pressure medium accumulator, comprising: pressing a coupling element (41, 48) into an accumulator housing (30). Fitting the pre-assembled component group consisting of the sealing element (32, 33, 35), the partition element (31) and the guide ring (36) into the pressure accumulator casing (30)
The component group consisting of the coupling element and the accumulator housing (30) is inserted into the hydraulic module (2
3) A method for splicing a hydraulic module of a brake device of a vehicle and a pressure medium accumulator, which is press-fitted therein.