EP2054284A2 - Servofrein - Google Patents

Servofrein

Info

Publication number
EP2054284A2
EP2054284A2 EP07788297A EP07788297A EP2054284A2 EP 2054284 A2 EP2054284 A2 EP 2054284A2 EP 07788297 A EP07788297 A EP 07788297A EP 07788297 A EP07788297 A EP 07788297A EP 2054284 A2 EP2054284 A2 EP 2054284A2
Authority
EP
European Patent Office
Prior art keywords
valve body
ring
brake booster
sealing seat
valve
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Withdrawn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
EP07788297A
Other languages
German (de)
English (en)
Inventor
Stephan Becker
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP2054284A2 publication Critical patent/EP2054284A2/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
    • 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
    • B60T13/24—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 gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/57—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of control valves

Definitions

  • the invention relates to a brake booster for motor vehicles with an amplifier housing, the interior of which is divided by a movable wall into a vacuum chamber and a working chamber, and with a movable wall supporting the control housing, in which a control valve is arranged, which acts on the movable wall on a pneumatic Pressure difference controls and actuated both by an actuating rod by means of a valve piston and independently of the actuating rod by an electromagnet and consists of three concentrically arranged sealing seats and a cooperating with the sealing seats, provided with axial passages valve body, wherein the first sealing seat in the control housing and the second sealing seat on the valve piston are formed, while the third sealing seat is formed on a, cooperating with the electromagnet sleeve, and wherein a relative to the third sealing seat slidably angeo rdnetes ring member is provided, which is supported with the interposition of an elastic or compressible element on the sleeve, the valve body facing the edge region by radial openings separate
  • the ring is provided integrally connected to the sub-areas of the ring element, whereby an additional assembly of the ring can be omitted.
  • a simple and inexpensive production of the ring element is achieved in that the ring element is provided with the ring as a one-piece injection molded part.
  • the areas of the ring member on a larger wall thickness, wherein at least a portion of the portions is provided with the valve body facing recesses are provided.
  • Figure 1 shows the pneumatic control group of a brake booster according to the invention in longitudinal section, partially broken away, in the inactive ready position.
  • Fig. 2 is a perspective view of an assembly forming part of the pneumatic control valve of the brake booster according to the invention
  • FIG. 3 shows the assembly according to FIG. 2 in an axial sectional view
  • Fig. 4 shows an enlarged section in the region of the poppet valve of a known brake booster
  • a control valve 12 which can be actuated by an actuating rod 7 is guided in a sealed manner in the booster housing 1.
  • the movable wall 2 supporting the control housing 5 housed and consists of a formed on the control housing 5 first sealing seat 15, a formed on one connected to the actuating rod 7 valve piston 9 second sealing seat 16 and a cooperating with two sealing seats 15,16, in a in Control housing 5 sealed immovably arranged guide member 21 guided, in cross-section L-shaped valve body 10 which is pressed by means of a, on the guide member 21 supporting the valve spring 22 against the valve seats 15,16.
  • the valve body 10 has two coaxially formed sealing lips 13, 14 of different axial length, which cooperate with two coaxial cylindrical guide surfaces 26, 27 of the guide member 21.
  • a return spring not shown in the drawing, which is supported on the vacuum-side end wall of the booster housing 1, also not shown, holds the movable wall 2 in the starting position shown.
  • a second compression spring or piston rod return spring 6 is provided which is supported on the one hand indirectly on the actuating rod 7 and on the other hand on the guide member 21 and whose force provides for a bias of the valve piston 9 and its sealing seat 16 relative to the valve body 10.
  • an approximately radially extending channel 29 is formed in the control housing 5.
  • the return movement of the valve piston 9 at the end of a braking operation is limited by a cross member 11 which rests in the release position of the brake booster shown in the drawing on a formed in the booster housing 1 stop.
  • the described arrangement thus allows a reduction in the difference between the response of the brake booster and acting on the valve piston restoring force in the sense that at a constant response force, an increase in the restoring force or at a constant restoring force, a reduction of the response is possible, thereby improving the Hysteresis of the brake booster according to the invention is achieved.
  • a third sealing seat 24 is provided radially between the first sealing seat 15 and the second sealing seat 16, which is actuated by means of an electromagnet 20, preferably in one, with the valve piston 9 fixedly connected housing 25 is arranged and therefore together with the valve piston 9 in the control housing 5 is displaceable.
  • the electromagnet 20 comprises a coil 43 arranged inside the housing 25 and an axially displaceably arranged cylindrical armature 31, which is partially guided in a closure part 30 closing the housing 25 and on which a sleeve 32 is supported, in the area facing the valve body 10 the aforementioned third sealing seat 24 is formed.
  • the third sealing seat 24 is axially offset relative to the second sealing seat 16 formed on the valve piston 9, so that between the third sealing seat 24 and the sealing surface 42 of the valve body 10, a gap is present.
  • a preferably radially inside the sleeve 32 guided ring member 36 is provided, which is shown in particular in Figs. 2 and 3 and the interposition of a resilient or compressible member 37 is supported on the sleeve 32 such that between him and the sleeve 32 a relative movement is possible.
  • the elastic or compressible element 37 is formed in the example shown by a corrugated spring and allows a controllable control of the ring member 36th A partial region of the ring element 36 facing the valve body 10 is subdivided into partial regions 33 by radial openings 38.
  • the ring member 36 at its end facing the valve body 10 in the region of the portions 33 a circumferential ring 47, which is provided integrally with the ring member 36 and the flush with the portions 33 in the direction Valve body 10 is formed. Furthermore, the circumferential ring 47 has the same inner diameter as the ring element 36 in the region of the partial regions 33.
  • the production of the Ring element 36 with the molded circumferential ring 47 takes place, for example, in a simple and cost-effective manner by injection molding.
  • the radial arrangement of the ring 47 with respect to the valve body 10 is shown in particular in FIG.
  • electrical switching means 40,44 are finally provided, which are particularly important in braking operations, in which in addition to the driver actuation of the solenoid 20 is driven to bring about regardless of the driver's will full braking (so-called brake assist function). It is of particular importance that the switching means 40,44 are operated at each braking. At the same time it must be ensured that the electromagnet 20 is switched off safely after completion of the power assisted braking operation.
  • the switching means shown consist of a preferably on the valve piston 9 and the housing 25 of the electromagnet 20 attached, two switch positions having micro-switch 40 and one, the micro-switch 40 by a translational movement actuated actuator 44, the is sealingly guided in a provided in the control housing 5 bore and cooperates with a amplifier housing fixed stop 45, which carries the reference numeral 45 and may be formed for example by a radial collar of the rear amplifier housing half. Between the actuating element 44 and the control housing 5, a pressure spring 46 is arranged so that the microswitch 40 remote from the end of the actuating element 44 abuts under a bias on the stop 45.
  • valve body 10 In the rest or standby position of the control valve 12 shown in FIG. 1, the valve body 10 abuts both the first sealing seat 15 and the second sealing seat 16, so that the two chambers 3,4 of the brake booster are separated from each other and the connection of the working chamber 4 is interrupted with the atmosphere.
  • the third sealing seat 24 is located at a distance from the sealing surface 42 of the valve body 10 and the annular element rests with its partial regions 33 and the circumferential ring 47 on the sealing surface 42.
  • the electromagnet 20 is energized, so that both the third sealing seat 24 and the ring member 36 at the same time compression of the elastic member 37 first come to rest on the valve body 10 and then the valve body 10 against the force of the valve spring 22 in move the drawing to the right, so that between the second sealing seat 16 and the valve body 10, a gap is formed and a ventilation of the working chamber 4 takes place.
  • the first sealing seat 15 is replaced by the third sealing seat 24 functionally.
  • a controlled pressure reduction phase of the second sealing seat 16 remains closed and the third sealing seat 24 lifts from the sealing surface 42, while the ring member 36 abuts with its portions 33 and the circumferential ring 47 by the bias of the elastic member 37 to the sealing surface 42, so that About recesses 49 of at least a portion of the portions 33, which in particular from Fig. 2 can be seen, a metered suction of the atmosphere from the working chamber 4 and thus a reduction in the booster housing 1 of the pneumatic
  • a normal braking is shown, in which the valve piston 9 is moved with the associated sealing seat 16 in the direction of actuation A by the actuating rod 7 and the first, formed on the control housing 5 sealing seat 15 remains closed.
  • atmosphere can flow into the working chamber 4 via the opened second sealing seat 16, so that a differential pressure is built up in the booster housing 1.
  • the general function of a brake booster is well known, so that a description in this respect is omitted.
  • Fig. 5 the relevant area of the brake booster according to the invention according to FIGS. 1 to 3 is shown in an enlarged view. As can be seen, covers the voltage applied to the sealing surface 42 ring 47 of the ring member 36, the radial inner side 48 of the passages 19. This ensures that the air flow L along an inner side 50 of the ring member 30 is guided in the direction of working chamber 4, whereby the air flow L the passages 19 do not overflow and noise can be prevented. As a further advantage results in an improved management of the air flow L, which under certain circumstances, an improvement of the An vide- and the release time of the brake booster can be made possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un servofrein pour véhicule à moteur dont la soupape de commande (12) peut être actionnée par un électroaimant (20) indépendamment d'une barre d'actionnement (7) poussant un piston (9) de soupape, cet électroaimant agissant sur un troisième siège d'étanchéité (24) qui permet d'aérer la chambre de travail (4). Le troisième siège d'étanchéité (24) est formé sur une douille (32) coopérant avec l'électroaimant (20), un élément annulaire (36) disposé mobile relativement au troisième siège d'étanchéité (24) étant en appui sur la douille (32), avec un élément (37) élastique ou compressible intercalaire. Afin d'améliorer le comportement sonore du servofrein, l'élément annulaire (36) comporte des moyens pour diriger un flux d'air (L) développé lors d'un freinage normal en direction de la chambre de travail (4).
EP07788297A 2006-08-17 2007-08-07 Servofrein Withdrawn EP2054284A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006038509 2006-08-17
DE102006053142A DE102006053142A1 (de) 2006-08-17 2006-11-10 Bremskraftverstärker
PCT/EP2007/058200 WO2008019974A2 (fr) 2006-08-17 2007-08-07 Servofrein

Publications (1)

Publication Number Publication Date
EP2054284A2 true EP2054284A2 (fr) 2009-05-06

Family

ID=38951363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07788297A Withdrawn EP2054284A2 (fr) 2006-08-17 2007-08-07 Servofrein

Country Status (6)

Country Link
US (1) US8297178B2 (fr)
EP (1) EP2054284A2 (fr)
JP (1) JP2010500945A (fr)
KR (1) KR20090052879A (fr)
DE (1) DE102006053142A1 (fr)
WO (1) WO2008019974A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009051236A1 (de) 2009-10-29 2011-05-12 Lucas Automotive Gmbh Unterdruckbremskraftverstärker für eine Kraftfahrzeugbremsanlage
JP5020420B2 (ja) * 2010-12-01 2012-09-05 三菱電機株式会社 電気車の制御装置
DE102020109452A1 (de) * 2020-04-03 2021-10-07 Zf Active Safety Gmbh Elektrisch ansteuerbare Betätigungseinheit für eine Kraftfahrzeugbremse, Bremskraftverstärker mit einer solchen elektrisch ansteuerbaren Betätigungseinheit und Kraftfahrzeug-Bremsanlage mit einem solchen Bremskraftverstärker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2824033B1 (fr) 2001-04-26 2003-08-08 Bosch Gmbh Robert Servomoteur pneumatique d'assistance de freinage avec dynamique d'assistance amelioree
US7950320B2 (en) 2004-07-10 2011-05-31 Continental Teves Ag & Co. Ohg Brake booster for motor vehicles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008019974A2 *

Also Published As

Publication number Publication date
US8297178B2 (en) 2012-10-30
JP2010500945A (ja) 2010-01-14
DE102006053142A1 (de) 2008-02-21
US20100192763A1 (en) 2010-08-05
WO2008019974A3 (fr) 2008-04-10
WO2008019974A2 (fr) 2008-02-21
KR20090052879A (ko) 2009-05-26

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