WO2014206830A2 - Servofrein électromécanique - Google Patents
Servofrein électromécanique Download PDFInfo
- Publication number
- WO2014206830A2 WO2014206830A2 PCT/EP2014/062830 EP2014062830W WO2014206830A2 WO 2014206830 A2 WO2014206830 A2 WO 2014206830A2 EP 2014062830 W EP2014062830 W EP 2014062830W WO 2014206830 A2 WO2014206830 A2 WO 2014206830A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pusher
- sleeve
- brake booster
- ball
- piston
- Prior art date
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
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/18—Connection thereof to initiating means
-
- 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
- B60T13/573—Vacuum systems indirect, i.e. vacuum booster units characterised by reaction devices
- B60T13/575—Vacuum systems indirect, i.e. vacuum booster units characterised by reaction devices using resilient discs or pads
-
- 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
- B60T13/74—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 electrical assistance or drive
- B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
Definitions
- the present invention relates to an electromechanical brake booster having a master cylinder primary piston pushed in the direction of its actuation by a push rod, itself pressed against the assistance piston.
- the primary piston is pushed by a thrust rod identical to that of the vacuum booster in which the thrust rod is formed of a rod that is said to be connected to a piston-shaped base supported by via the reaction disk against the assist piston actuated by the pneumatically operated braking force amplifier or the electric motor driving the piston via a rack-and-pinion transmission.
- the assembly In the case of the support piston secured to the pneumatic piston, the assembly is mounted relatively floating and has sufficient freedom not to impose a transverse force component on the primary piston but only a longitudinal force.
- the assist piston is held rigidly by its rack connection to the electromechanical drive so that it has no adaptation and the thrust exerted on the primary piston has a relatively transverse component. important.
- the document FR 03 1 1 580 describes an electric servomotor for braking assistance represented here in FIG. 1, which is the resumption of FIG. 1 of this patent.
- Figure 1 shows the brake booster, in section, combined with tandem master cylinder 48 whose primary piston 49 is pushed by the assist piston 20 via a push rod 47 or pusher.
- This pusher is pressed on the assistance piston via a reaction disk 40.
- the push rod 47 is composed of two parts to allow its length to be adapted to the particular type of brake booster; it has a rounded front end and a disc-shaped rear end leaning against the reaction disk.
- the push rod 47 is thus blocked along the axis (xx) of the booster, without degree of freedom, so that the transverse component of the thrust exerted by the assist piston 20 on the thrust rod 47 is reflected by a transverse force component exerted on the primary piston 49, causing its irregular wear .
- the object of the invention is to develop an electromechanical booster push rod or pusher exerting practically no thrust with a transverse component on the primary piston.
- the subject of the invention is an electromechanical brake booster of the type defined above, characterized in that it comprises a thrust unit connecting the assistance piston to the primary piston in the direction of its actuation and formed of a pusher whose forward end spherical cap is supported in a cup of the primary piston, the rear end having a ball joint, and a bearing having a base supported on the reaction disc and a sleeve receiving the ball of the pusher.
- the brake booster according to the invention has the advantage of creating a degree of freedom for the thrust unit that replaces the traditional push rod.
- This degree of freedom in the transverse direction avoids the transmission of a transverse component of the force exerted by the assistance piston on the thrust unit which, without this degree of freedom, would transmit this force with its component transverse to the piston.
- the thrust unit comprises a tulip-shaped clamp whose petals have hooking ends protruding outwardly and which form an inside collar delimiting elastically the receiving cavity of the ball of the pusher.
- the sleeve of the bearing has an internal groove for supporting the end of the petals of the clamp and the clamp is placed on the ball of the pusher before this assembly is engaged and secured in the sleeve by the hooking the end of the petals in the throat of the sleeve.
- the pusher has an outer ring slightly spaced from the edge of the sleeve when the pusher is connected to the sleeve to limit its tilting relative to the axis, before its introduction into the primary piston.
- This outer ring prevents excessive tilting of the pusher relative to the bearing thus facilitating the establishment of the thrust unit in the primary piston at the time of assembly of the brake booster to the master cylinder.
- the pusher is in two parts made separately and assembled according to the length that the pusher must have according to the type of brake booster.
- the sleeve constitutes the cavity forming the cup for the ball of the pusher, the sleeve having a crimping zone in front of the cavity for retaining the ball and leaving it free to rotate.
- the invention makes it possible, by simple means, to avoid the transmission of a transverse component of the thrust force exerted on the primary piston without the need to modify the structure of the master cylinder and its assembly to the electromechanical brake booster.
- FIG. 1 is a partial sectional view of an electromechanical booster according to the state of the art (FR 03 1 1 580),
- FIG. 2 is a partially cutaway view of an electromechanical booster booster unit according to the invention
- FIG. 3 is a sectional view of the combination of the booster booster unit with a primary piston and the support of the booster piston according to the invention
- Figure 4 is a sectional view similar to that of Figure 3 of a variant of the thrust unit installed in the primary piston and in the support piston support.
- the front (AV) of the brake booster is located on the side of the tandem master cylinder and the rear (AR) is located on the side of the control rod actuated by the brake pedal as is indicated in Figure 1.
- FIG 2 shows very schematically a thrust unit 100 of electromechanical brake booster according to the invention for transmitting the thrust of the assistance piston to the primary piston.
- This thrust unit 100 consists of a pusher 1 10 and a bearing 120 receiving one end of the pusher and pressing on the assist piston while the other end of the pusher rests in a piston cup primary.
- the pusher 1 10 is made in two parts, a front part 1 1 1 and a rear part 1 12 assembled by fitting. The front portion 1 1 1 is shown uncut and the rear portion 1 12 is shown cut.
- the rear portion 1 12 has a cylindrical housing 1 13 for force-fitting the pin 1 14 of the front part 1 1 1 and constitute a unitary assembly. These two parts 1 1 1, 1 12 are made separately and at least one of the parts has a length chosen according to the length that must present the pusher 1 10 according to the type of brake booster to equip.
- the pusher 1 10 has a front end 1 15, rounded in the shape of spherical cap to cooperate with a housing 201 in the form of a ball cup made in the body of the primary piston 200 ( Figures 3 and 4).
- the rear end of the pusher 1 10 is constituted by a ball joint 1 16 connected by a frustoconical portion 1 17 to the body 1 18 of the pusher. Beyond this frustoconical portion 1 17, the body 1 18 carries a peripheral ring 1 19 serving as a limitation of tilt limitation as will be seen next.
- the bearing 120 receiving the ball 1 16 at the rear end of the pusher 100 is formed of a base 121 constituted by a disc carrying a sleeve 122 directly receiving the ball 1 16 of the pusher ( Figure 4) or by the interposition of a piece 130 ( Figure 3) realizing in all cases a ball joint.
- the thrust unit 100 is integral in translation in the direction of the axis (xx) but has a degree of freedom in the transverse direction thanks to the cap-shaped head 15 which is free to pivot relative to the cup 201 of the primary piston body 200 and the ball 1 16 of the pusher 1 10 relative to the bearing 120 which is itself carried by the support of the assistance piston 300.
- FIG. 3 shows a first embodiment of the thrust unit 100 with a pusher 1 10 such as that of FIG. 2 and a bearing 120 carried by the support piston support 300.
- the bearing 120 consists of a disc-shaped base 121 carrying a sleeve 122, the assembly being engaged in an axial sleeve 301 of the support 300.
- This base 121 which is supported on the reaction disc 310 receives the ball 1 16 of the pusher 120 by the intermediate tulip-shaped forceps 130 making the spherical cup 131 bordered by its petals 132.
- the petals 132 have a path which, starting from the back of the clamp, narrows to form a neck 133 coming in front of the patella 1 16 to retain it in the cup 131 and then flake to form attachment ends 134 of the clamp 130 in the sleeve 122 of the bearing 120.
- the sleeve 122 has a peripheral groove 123 in which cling the protruding ends 134 of the petals 132 of the clamp 130.
- the elastic petals 132 of the clamp 130 retract against the frustoconical junction 1 17 connecting the ball 1 16 to the body 1 18 of the pusher; then, once arrived in the groove 123, the petals 132 move away elastically and lock the clamp 130 and the ball 1 16 to the bearing 120 in the direction of the axis xx while leaving the ball 1 16 the ability to rotate freely in the cup 131 formed by the clamp 130.
- FIG. 3 also shows that the ring 1 19 of the pusher 1 10 is at a certain distance from the front edge 124 of the sleeve 122, which allows a transverse tilting movement of the pusher 1 10 with respect to the sleeve 122. This movement is limited by the abutment of the ring 1 19 against the edge 124 of the sleeve 122. This limitation does not interfere with the normal operation of the brake booster but before mounting, it prevents the pusher from tilting excessively relative to the axis ( xx) defined by the sleeve 122. This facilitates the introduction of the pusher 1 10 in the primary piston 200, itself already engaged in the master cylinder.
- the other elements of the brake booster of the invention are not shown in FIG.
- FIG. 4 shows another variant of an electromechanical brake booster according to the invention.
- This variant differs from the first embodiment of Figure 3 by the shape of the bearing 140 whose base 141 carries a sleeve 142 which directly receives the ball 1 16 at the rear end of the pusher 1 10, the bottom of the sleeve forming the cup 143 for the ball 1 16.
- the pusher 1 10 has a peripheral flange 1 19 intended to limit the tilting movement of the pusher 1 10 relative to the axis xx of the bearing 140 based on the edge 144 of the sleeve 142.
- the ball 1 16 is retained in the cavity closing the cup 143 by the crimping zone 145 of the sleeve 142 in front of the ball 1 16.
- This embodiment of the pusher 1 10 is shorter because of the reduction in the length of the frustoconical portion 1 17 due to the suppression of the clamp 130.
- the other parts of this booster and in particular, the primary piston 200 and the assistance piston or its support 300 are identical to the previous embodiment.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Braking Arrangements (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112014003012.0T DE112014003012T5 (de) | 2013-06-28 | 2014-06-18 | Elektromechanischer Bremskraftverstärker |
CN201480036598.8A CN105324285B (zh) | 2013-06-28 | 2014-06-18 | 机电伺服制动器 |
JP2016520463A JP6244018B2 (ja) | 2013-06-28 | 2014-06-18 | 電気機械式ブレーキ倍力装置 |
US14/901,065 US10053075B2 (en) | 2013-06-28 | 2014-06-18 | Electromagnetic servo brake |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1356267 | 2013-06-28 | ||
FR1356267A FR3007723B1 (fr) | 2013-06-28 | 2013-06-28 | Servofrein electromecanique |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2014206830A2 true WO2014206830A2 (fr) | 2014-12-31 |
WO2014206830A3 WO2014206830A3 (fr) | 2015-05-07 |
Family
ID=49322543
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/062830 WO2014206830A2 (fr) | 2013-06-28 | 2014-06-18 | Servofrein électromécanique |
Country Status (6)
Country | Link |
---|---|
US (1) | US10053075B2 (fr) |
JP (1) | JP6244018B2 (fr) |
CN (1) | CN105324285B (fr) |
DE (1) | DE112014003012T5 (fr) |
FR (1) | FR3007723B1 (fr) |
WO (1) | WO2014206830A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3040955B1 (fr) * | 2015-09-14 | 2017-10-06 | Bosch Gmbh Robert | Systeme d'assistance de freinage electromecanique |
DE102020109449A1 (de) * | 2020-04-03 | 2021-10-07 | Zf Active Safety Gmbh | Baugruppe für einen elektromechanischen Bremskraftverstärker einer Fahrzeug- Bremsanlage, Bremskraftverstärker mit einer solchen Baugruppe und Fahrzeug-Bremsanlage mit einer solchen Baugruppe |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4354353A (en) * | 1980-01-17 | 1982-10-19 | Hamilton-Pax, Inc. | Compression rod assembly |
GB2104605B (en) * | 1981-07-04 | 1985-03-06 | Lucas Ind Plc | Hydraulic boosters for vehicle braking systems |
DE3532769A1 (de) * | 1985-09-13 | 1987-03-19 | Bosch Gmbh Robert | Kugelgelenk fuer einen bremskraftverstaerker |
JP3115169B2 (ja) * | 1993-10-13 | 2000-12-04 | アイシン精機株式会社 | ブレーキ反力伝達装置 |
FR2860474B1 (fr) * | 2003-10-02 | 2006-04-28 | Bosch Gmbh Robert | Servomoteur electrique d'assistance au freinage et vehicule comportant un tel servomoteur |
FR2947228B1 (fr) * | 2009-06-25 | 2012-11-30 | Bosch Gmbh Robert | Systeme de freins a servofrein electrique |
CN103129546B (zh) | 2011-12-05 | 2016-11-02 | 博世汽车部件(苏州)有限公司 | 电子控制制动助力器 |
-
2013
- 2013-06-28 FR FR1356267A patent/FR3007723B1/fr not_active Expired - Fee Related
-
2014
- 2014-06-18 WO PCT/EP2014/062830 patent/WO2014206830A2/fr active Application Filing
- 2014-06-18 CN CN201480036598.8A patent/CN105324285B/zh active Active
- 2014-06-18 US US14/901,065 patent/US10053075B2/en active Active
- 2014-06-18 JP JP2016520463A patent/JP6244018B2/ja active Active
- 2014-06-18 DE DE112014003012.0T patent/DE112014003012T5/de active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3007723B1 (fr) | 2015-07-31 |
CN105324285A (zh) | 2016-02-10 |
US20160152220A1 (en) | 2016-06-02 |
FR3007723A1 (fr) | 2015-01-02 |
WO2014206830A3 (fr) | 2015-05-07 |
DE112014003012T5 (de) | 2016-05-04 |
JP2016521660A (ja) | 2016-07-25 |
JP6244018B2 (ja) | 2017-12-06 |
CN105324285B (zh) | 2018-11-06 |
US10053075B2 (en) | 2018-08-21 |
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