GB2486051A - Hydraulic vehicle brake system having a preassembled accumulator - Google Patents

Hydraulic vehicle brake system having a preassembled accumulator Download PDF

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Publication number
GB2486051A
GB2486051A GB1119682.1A GB201119682A GB2486051A GB 2486051 A GB2486051 A GB 2486051A GB 201119682 A GB201119682 A GB 201119682A GB 2486051 A GB2486051 A GB 2486051A
Authority
GB
United Kingdom
Prior art keywords
hydraulic
accumulator device
piston
hydraulic unit
bush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1119682.1A
Other versions
GB201119682D0 (en
Inventor
Rainer Schwarz
Andreas Weh
Matthias Mayr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB201119682D0 publication Critical patent/GB201119682D0/en
Publication of GB2486051A publication Critical patent/GB2486051A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/42—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4208—Debooster systems
    • B60T8/4225—Debooster systems having a fluid actuated expansion unit
    • B60T8/4233—Debooster systems having a fluid actuated expansion unit with brake pressure relief by introducing fluid pressure into the expansion unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/04—Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
    • B60T8/368—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units combined with other mechanical components, e.g. pump units, master cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/42—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4275—Pump-back systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/05—Buffers therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/21—Accumulator cushioning means using springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/405—Housings
    • F15B2201/4056—Housings characterised by the attachment of housing components

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Electromagnetism (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

A hydraulic unit 10 of a hydraulic vehicle brake system comprising a hydraulic block 12 and an accumulator device 16 inserted into the hydraulic block 12, wherein the accumulator device 16 is formed as a preassembled module. The accumulator 16 may be connected to the hydraulic block 12 by adhesive and/or welding.

Description

Hydraulic unit of hydraulic vehicle brake system
Background art
The invention relates to a hydraulic unit of a hydraulic vehicle brake system comprising a hydraulic block and an accumulator device inserted into the hydraulic block. The invention further relates to a method of manufacturing a hydraulic unit and to an accumulator device of a hydraulic unit of a vehicle brake system for inserting into a hydraulic block of the hydraulic unit. Finally the invention relates to a method of manufacturing such an accumulator device.
Hydraulic units are used in hydraulic vehicle brake systems to deliver hydraulic fluid selectively to or from associated brakes. During delivery of the hydraulic fluid the usable pumps and the movements of associated pistons give rise to flow surges and pulsations at master cylinder and brakes. In order to absorb such flow surges and pulsations, on known hydraulic units accumulator devices are provided, which may at times receive and subsequently discharge hydraulic fluid. The accumulator devices are formed by a hollow space that is formed in the associated hydraulic block and generally comprise a piston, which is spring-loaded and may be displaced by fluid that flows into the accumulator device. In order to close the hollow space in a fluid-tight manner, on known accumulator devices an accumulator cover is provided, which is screwed or pressed into the associated hydraulic block and caulked. In the course of caulking the hydraulic block and/or the pump housing is plastically deformed and together with the accumulator cover forms a form closure.
The object of the invention is to provide a hydraulic unit that, on the one hand, is as economical as possible to manufacture while being easy to assemble and, on the other hand, guarantees as small and lightweight a construction as possible.
Disclosure of the invention
According to the invention a hydraulic unit of a hydraulic vehicle brake system comprising a hydraulic block and an accumulator device inserted into the hydraulic block is provided, wherein the accumulator device is formed as a preassembled module.
The object of the invention is further achieved by an accumulator device of a hydraulic unit of a vehicle brake system for inserting into a hydraulic block of the hydraulic unit, wherein the accumulator device is formed as a preassembled module.
The hydraulic unit of a hydraulic vehicle brake system comprises a hydraulic block, in the interior of which, preferably in a bore, an accumulator device is integrated. This is accumulator device is fashioned according to the invention as a prefabricated, i.e. preassembled module, i.e. as a so-called initially external accumulator device. This accumulator device is therefore received as a separately existing module in the hydraulic block.
The accumulator device serves as a low-pressure accumulator that in a hydraulic system, such as the hydraulic vehicle brake system, absorbs so-called pressure peaks that are induced for example by the previously mentioned pressure pulsations.
The accumulator device in a preferred manner comprises a bush, in the interior of which a so-called hollow-or piston-swept space is formed. In the piston-swept space a spring and a piston are disposed, wherein the piston is preloaded resiliently by means of the spring in the direction of a fluid feed line. If in the event of pressure pulsations or flow surges hydraulic fluid flows through the fluid feed line into the piston-swept space, the piston is displaced counter to the spring action and the fluid is temporarily stored.
One advantage of the invention is that the hydraulic unit according to the invention is particularly economical to manufacture. In particular, it is guaranteed that the accumulator device may be manufactured in the form of a preassembled module within a shorter time than if it is to be installed, as in the background art, in the form of individual components into a bore in the hydraulic block. This moreover makes it possible to provide an, as a whole, lighter hydraulic unit having smaller dimensions.
In a preferred embodiment the accumulator device is held in the hydraulic block by means of a welded connection.
Such an accumulator device and in particular the bush thereof comprise in the present case an outer casing that is preferably connected over a specific portion by welding to the hydraulic block. The welded connection forms in particular a welded seam that is configured to extend radially around the circumference or part of the circumference.
The welded connection in the present case performs a retaining function or also in addition a sealing function relative to the area surrounding the hydraulic unit.
Owing to the provision of a welded connection between the hydraulic block and the accumulator device it is no longer necessary to use an accumulator cover that has to be screw-fastened to the associated hydraulic block or pressed in there and caulked.
In particular, this means that there is no need to reserve any additional material on the pump housing for the caulking operation in accordance with the background art.
Rather, the pump housing may be configured with a smaller wall thickness, thereby resulting in art enlarged piston-swept space in the interior of the accumulator device.
The accumulator device may moreover be connected to the hydraulic block by means of an adhesive that performs the function of a sealing agent.
In the present case the accumulator device may be connected to the hydraulic block also additionally by means of an adhesive connection. In this case, in a preferred manner the welded connection performs a retaining function and the adhesive connection a sealing function.
The connecting of the accumulator device to the hydraulic block by welding, also in combination with glueing, enables the use of a bush with a reduced wall thickness compared to neighbouring elements and/or interfaces because according to the invention during the mounting of the accumulator device in the hydraulic block no significant plastic deformations occur.
In a preferred manner the accumulator device comprises a bush that is formed in the shape of a cup, in particular integrally, from a substantially cylindrical casing and an end face. This end face, in the inserted state of the accumulator device in the hydraulic block, forms an outer surface of the hydraulic unit.
The bush may be formed in particular from a so-called drawable aluminium alloy (in particular AIMg3). This provides a bush that is easy to manufacture by deep drawing and is also extremely light.
The shape of the bush, in line with the function thereof, is fashioned with a particularly simple geometry. A portion for fastening, in particular for caulking an accumulator cover, such as for example a hat rim, is not necessary. This allows a further reduction in manufacturing costs.
The inner surface of the bush may preferably be coated at least partially with an anodic oxide layer. Such a coating is provided particularly in the event of raised operating capacity requirements of the hydraulic unit. In the case of an anodic oxide coating, in particular an oxidic protective layer is produced by anodic oxidation on the inner surface of the bush. In this case, this protective layer is formed by converting the uppermost metal zone to an oxide and/or hydroxide. The result is a thin layer that protects ia. against corrosion.
The preassembled module in this case is fashioned preferably with a retaining washer for the piston and/or with a crimped bush, wherein by means of the crimping operation preferably a stop for the piston is formed.
A method of manufacturing a hydraulic unit according to the invention is further provided. The method comprises the steps: -provide a hydraulic block, -provide an accumulator device as a preassembled module, and -join the accumulator device as a preassembled module to the hydraulic block to form a hydraulic unit.
By virtue of the use of an accumulator device that is provided as a preassembled module, this module may be pre-inspected and the production time of the hydraulic unit may be markedly shortened, thereby reducing manufacturing costs.
The accumulator device, which is present as a preassembled module, is welded preferably after joining to the hydraulic block. By virtue of such a welded connection technique a simple and economical connection technique is provided. In particular it is possible to dispense with a laborious step of caulking a cover to a bush of the accumulator device.
is Finally the object is achieved according to the invention by a method of manufacturing an accumulator device according to the invention. The method comprises the steps: -provide a bush that is formed integrally from a substantially cylindrical casing and an end face and has in the interior a piston-swept space, -provide a spring, a piston and a retaining washer, -introduce the spring into the piston-swept space and centre the spring at the end face of the bush, -mount the piston in the piston-swept space in such a way that the spring exerts a pressure on an end face of the piston facing the end face of the bush, and -mount the retaining washer on the piston.
This method enables a particularly efficient method of producing a so-called external and initially separate accumulator device in accordance with the previously described features and advantages.
Brief description of the drawings
There now follows a detailed description of an embodiment of the solution according to the invention with reference to the accompanying drawings. These show: Fig. 1 a sectional perspective view of part of a hydraulic unit according to the
background art,
Fig. 2 a longitudinal section of an accumulator device according to the invention, and Fig. 3 a section of part of a hydraulic unit according to the invention.
Description of embodiments
Fig. I shows a hydraulic unit 10 of a hydraulic vehicle brake system according to the background art. The hydraulic unit 10 substantially comprises a hydraulic block 12 having a bore 14, in which the components of an accumulator device 16 are integrated.
The accumulator device 16 is used to damp flow surges and pressure pulsations of a hydraulic fluid of the vehicle brake system that are induced i.a. by pumps and piston movements at brake cylinders of the vehicle brake system.
The accumulator device 16 comprises a hollow-or piston-swept space 18, which is formed as part of the bore 14 in the hydraulic block 12. Displaceably supported in the piston-swept space 18 is a piston 20, which is loaded with pressure by means of a helical spring 22 and pushed in the direction of an end-side fluid feed line 24 that is formed likewise by means of a bore. If fluid is fed as a result of pressure peaks through the fluid feed line 24 into the accumulator device 16, the piston 20 is displaced counter to the spring action in the piston-swept space 18 and the fluid is stored temporarily.
For fluid-tight closure of the piston-swept space 18 there is provided on the outer surface 25 of the hydraulic unit 10 an accumulator cover 26, which is positively connected by caulking to the hydraulic block 12.
Fig. 2 shows an accumulator device 16 according to the invention in the form of a preassembled module. In Fig. 3 a hydraulic unit 10 according to the invention of a hydraulic vehicle brake system is represented with the accumulator device 16 according to the invention installed.
The accumulator device 16 according to Fig. 2 comprises a bush 28 manufactured from aluminium, which is formed integrally in the shape of a cup from a substantially cylindrical casing 30 and an end face 32 and in its interior encloses a piston-swept space 18. The end face 32 of the bush 28, when it is joined to the hydraulic block 12, forms the buter surface 25 of the hydraulic unit 10 and closes off the piston-swept space 18 in a fluid-tight manner (cf. Fig. 3).
An inner lateral surface 33 of the bush 28 has at least partially an anodic oxide layer as a protective layer, with the result that corrosion phenomena may be substantially avoided.
in the interior of the piston-swept space 18 a helical spring 22 is set and centred at the end face 32 of the bush 28. This helical spring 22 loads a piston 20 with a resetting force that attempts to push the piston 20 out of the piston-swept space 18. In the present case the piston 20 is formed from plastics material or steel. The use of a piston in the form of a deep-drawn part, in particular of steel, renders the piston 20
insensitive to the introduction of heat.
If fluid flows through a fluid feed line 24 -as shown in Fig. 3 -into the accumulator device 16, this fluid exerts a pressure on the piston 20, which is pushed counter to the spring action of the helical spring 22 into the piston-swept space 18, namely at most as far as a stop 35, which is formed in the casing 30 of the bush 28 by means of a shoulder 37 that projects into the piston-swept space 18.
Above an end face 34 of the piston 20 that is remote from the helical spring 22 a sealing ring 36 in the form of an 0-ring is disposed. This sealing ring 36 seals off the region, in which the helical spring 22 is disposed, in a substantially fluid-tight manner.
Above the sealing ring 36 a retaining washer 40 is pressed in, which holds and fixes the piston 20 and the sealing ring 36 inside the bush 28.
During assembly, i.e. during the joining of the individual components of the accumulator device 16 into a preassembled module, the centring of the helical spring 22 enables a so-called "blind" assembly of the piston 20 and sealing ring 36. For this purpose, a chamfer that is not represented here is embossed on the bush 28. The piston 20, the sealing ring 36 and the retaining washer 40 are pressed onto the helical spring 22 and
B
the retaining washer 40 is pressed via the chamfer into the bush 28. The press fit is in this case designed in such a way that the pressure of the helical spring 22 cannot press the interconnected system apart. The retaining washer 40 for this purpose is pressed preferably ca. 0.5 mm below an outside edge 42 of the bush 28. After assembt of the accumulator device 16 this preassembled module is pre-inspected, with the result that a subsequent inspection in the hydraulic unit 10 is no longer necessary.
During the manufacture of the hydraulic unit 10 the accumulator device 16 is introduced into a bore 14 of a hydraulic block 12 (cf. Fig. 3). In this case, the bush 28 is positioned in such a way in the bore 14 that the end face 32 of the bush 28 forms the outer surface 25 of the hydraulic unit 10 and the end opposite the end face 32 adjoins the fluid feed line 24.
A portion of the outer casing 44 of the bush 28 and an edge 46 of the hydraulic block 12 are connected by welding. In this case, a welded seam 47 may be formed over the entire outer casing, i.e. over 360°, or alternatively only over a part thereof. The welded seam 47, i.e. the welded connection 47 between the bush 28 and the hydraulic block 12 is used to hold the accumulator device 16 in the bore 14 of the hydraulic block 12 and to seal off the bore 14 from the surrounding area.
Afternatively, the sealing function may be realized by means of an adhesive connection or a micro-encapsulation at the outer casing 44 of the bush 28 and the edge 46 of the hydraulic block 12. in such a case the accumulator device 16 is connected to the hydraulic block 12 by means of an adhesive as a sealing agent and the welded connection 47 fulfils the function of holding the accumulator device 16 in the hydraulic block 12. The sealing agent may alternatively be introduced into a mounting chamfer and activated by heat so that it performs a sealing function.
The hydraulic unit 10 is mounted via a damping element 48 and a retaining element 50 on a vehicle body (not represented here) of a motor vehicle.
A hydraulic unit 10 is therefore provided, which because of the preassembled accumulator device 16 according to the invention is of a lighter design and has smaller dimensions. The hydraulic unit 10 is moreover economical to manufacture as a result of the use of the preassembled module and a faster operation of joining this module to the hydraulic block 12. In particular the bush 28 has a simple geometry, thereby further reducing production costs.
Finally, it should be noted that independent protection is to be conferred on all of the features described in the application documents and in particular in the dependent claims, either individually or in any combination, despite their being formally related to one or more specific claims.

Claims (15)

  1. Claims: 1. Hydraulic unit (10) of a hydraulic vehicle brake system comprising a hydraulic block (12) and an accumulator device (16) inserted into the hydraulic block (12), characterized in that the accumulator device (16) is formed as a preassembled module.
  2. 2. Hydraulic unit (10) according to claim 1, characterized in that the accumulator device (16) is held in the hydraulic block (12) by means of a welded connection (47).
  3. 3. Hydraulic unit (10) according to claim I or 2, characterized in that the accumulator device (16) is connected to the hydraulic block (12) by means of an adhesive as a sealing agent.
  4. 4. Hydraulic unit (10) according to one of the preceding claims, characterized in that the accumulator device (16) comprises a bush (28) that is formed in the shape of a cup from a substantially cylindrical casing (30) and an end face (32).
  5. 5. Hydraulic unit (10) according to claim 4, characterized in that the end face (32) of the bush (28), when the accumulator device (16) is inserted in the hydraulic block (12), is disposed at the outside.
  6. 6. Hydraulic unit (10) according to claim 4 or 5, characterized in that an inner lateral surface (33) of the bush (28) has at least partially an anodic oxide layer.
  7. 7. Hydiaulic unit (10) according to one of claims I to 6, characterized in that the preassembled module is fashioned by means of a retaining washer (40) or a crimped bush (28).
  8. 8. Method of manufacturing a hydraulic unit (10) according to one of claims 1 to 7, comprising the steps: -provide a hydraulic block (12), -provide an accumulator device (16) as a preassembled module, and -join the accumulator device (16) as a preassembled module to the hydraulic block (12) to form a hydraulic unit (10).
  9. 9. Method according to claim 8, characterized in that the accumulator device (16) as a preassembled module is connected after joining by welding to the hydraulic block (12).
  10. 10. Accumulator device (16) of a hydraulic unit (10) of a vehicle brake system for inserting into a hydraulic block (12) of the hydraulic unit (10), characterized in that the accumulator device (16) is formed as a preassembled module.
  11. 11. Method of manufacturing an accumulator device (16) according to claim 10, comprising the steps: -provide a bush (28), which is formed integrally from a substantially cylindrical casing (30) and an end face (32) and has in the interior a piston-swept space (18), -provide a spring (22), a piston (20) and a retaining washer (40), -introduce the spring (22) into the piston-swept space (18) and centre the spring (22) at the end face (32) of the bush (28), -mount the piston (20) in the piston-swept space (18) in such a way that the spring (22) exerts a pressure on an end face (34) of the piston (20) facing the end face (32) of the bush (28), and -mount the retaining washer (40) on the piston (20).
  12. 12. Hydraulic unit substantially as hereinbefore described with reference to Figs. 2 and 3 of the accompanying drawings.
  13. 13. Method of manufacturing a hydraulic unit, substantially as hereinbefore * 30 described with reference to Figs. 2 and 3 of the accompanying drawings.
  14. 14. Accumulator device of a hydraulic unit, substantially as hereinbefore described with reference to Figs. 2 and 3 of the accompanying drawings.
  15. 15. Method of manufacturing an accumulator device of a hydraulic unit, substantially as hereinbefore described with reference to Figs. 2 and 3 of the accompanying * drawings.
GB1119682.1A 2010-12-01 2011-11-14 Hydraulic vehicle brake system having a preassembled accumulator Withdrawn GB2486051A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010062267A DE102010062267A1 (en) 2010-12-01 2010-12-01 Hydraulic unit of a hydraulic vehicle brake system

Publications (2)

Publication Number Publication Date
GB201119682D0 GB201119682D0 (en) 2011-12-28
GB2486051A true GB2486051A (en) 2012-06-06

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GB1119682.1A Withdrawn GB2486051A (en) 2010-12-01 2011-11-14 Hydraulic vehicle brake system having a preassembled accumulator

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DE (1) DE102010062267A1 (en)
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2016173697A1 (en) * 2015-04-28 2016-11-03 Hydac Technology Gmbh Hydraulic accumulator
WO2019120687A1 (en) * 2017-12-22 2019-06-27 Continental Teves Ag & Co. Ohg Unit having at least one piston with an associated piston spring

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219054B4 (en) 2012-10-18 2022-02-10 Robert Bosch Gmbh Hydraulic accumulator for a hydraulic vehicle brake system
DE102016211422A1 (en) * 2016-06-27 2017-12-28 Robert Bosch Gmbh Hydraulic block with a hydraulic component

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US4777983A (en) * 1987-08-18 1988-10-18 General Motors Corporation Apparatus and method of an accumulator with rigid secondary diaphragm
EP0417440A1 (en) * 1989-09-13 1991-03-20 Robert Bosch Gmbh Fluid accumulator, especially for vehicle braking systems
US5429425A (en) * 1991-01-15 1995-07-04 Alfred Teves Gmbh Wheel brake unit for a modular brake system
DE19961682A1 (en) * 1999-12-21 2001-06-28 Continental Teves Ag & Co Ohg Hydraulic fluid store for a hydraulic unit, made as a pre-assembled component unit
US6398315B1 (en) * 1997-11-14 2002-06-04 Continental Teves Ag & Co. Ohg Hydraulic unit for slip-controlled brake systems
EP1308634A1 (en) * 2000-08-09 2003-05-07 NOK Corporation Accumulator
US20050001478A1 (en) * 2003-07-03 2005-01-06 Taro Segawa Brake hydraulic pressure control unit

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
US4777983A (en) * 1987-08-18 1988-10-18 General Motors Corporation Apparatus and method of an accumulator with rigid secondary diaphragm
EP0417440A1 (en) * 1989-09-13 1991-03-20 Robert Bosch Gmbh Fluid accumulator, especially for vehicle braking systems
US5429425A (en) * 1991-01-15 1995-07-04 Alfred Teves Gmbh Wheel brake unit for a modular brake system
US6398315B1 (en) * 1997-11-14 2002-06-04 Continental Teves Ag & Co. Ohg Hydraulic unit for slip-controlled brake systems
DE19961682A1 (en) * 1999-12-21 2001-06-28 Continental Teves Ag & Co Ohg Hydraulic fluid store for a hydraulic unit, made as a pre-assembled component unit
EP1308634A1 (en) * 2000-08-09 2003-05-07 NOK Corporation Accumulator
US20050001478A1 (en) * 2003-07-03 2005-01-06 Taro Segawa Brake hydraulic pressure control unit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016173697A1 (en) * 2015-04-28 2016-11-03 Hydac Technology Gmbh Hydraulic accumulator
JP2018514719A (en) * 2015-04-28 2018-06-07 ハイダック テクノロジー ゲゼルシャフト ミット ベシュレンクテル ハフツングＨｙｄａｃ Ｔｅｃｈｎｏｌｏｇｙ Ｇｅｓｅｌｌｓｃｈａｆｔ Ｍｉｔ Ｂｅｓｃｈｒａｎｋｔｅｒ Ｈａｆｔｕｎｇ Hydraulic accumulator
WO2019120687A1 (en) * 2017-12-22 2019-06-27 Continental Teves Ag & Co. Ohg Unit having at least one piston with an associated piston spring
CN111601740A (en) * 2017-12-22 2020-08-28 大陆-特韦斯股份有限公司 Unit having at least one piston with an associated piston spring
US11370403B2 (en) 2017-12-22 2022-06-28 Continental Teves Ag & Co. Ohg Unit having at least one piston with an associated piston spring
CN111601740B (en) * 2017-12-22 2022-09-23 大陆-特韦斯股份有限公司 Unit having at least one piston with an associated piston spring

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DE102010062267A1 (en) 2012-06-06
GB201119682D0 (en) 2011-12-28
FR2968261A1 (en) 2012-06-08

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