WO2002087941A1 - Maître-cylindre comportant des moyens de levee de clapet ameliores. - Google Patents
Maître-cylindre comportant des moyens de levee de clapet ameliores. Download PDFInfo
- Publication number
- WO2002087941A1 WO2002087941A1 PCT/FR2002/001399 FR0201399W WO02087941A1 WO 2002087941 A1 WO2002087941 A1 WO 2002087941A1 FR 0201399 W FR0201399 W FR 0201399W WO 02087941 A1 WO02087941 A1 WO 02087941A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- master cylinder
- piston
- support means
- valve
- tandem master
- 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
- B60T11/232—Recuperation valves
Definitions
- Master cylinder comprising improved valve lifting means
- the present invention relates mainly to a master cylinder, in particular a tandem master cylinder comprising improved valve lifting means.
- the master cylinder comprises at least one piston compressing the brake fluid in a pressure chamber, the piston is actuated by a push rod controlled by a control rod connected to a brake pedal, advantageously assisted by a booster pneumatic when braking.
- the brake fluid is supplied by a supply chamber connected to a brake fluid reservoir by sealed means.
- the supply and pressure chamber are placed in communication by a passage made in the piston.
- the brake fluid is pressurized in the pressure chamber by advancing the piston in the pressure chamber and by sealing off the communication with the supply chamber. The volume of the pressure chamber is reduced, the brake fluid is compressed allowing the brakes to be actuated at the wheels.
- the passage between the two chambers is closed in a known manner by a valve when it loses its support on a pin mounted floating perpendicularly to the axis of the master cylinder in the supply chamber.
- the valve is slidably mounted in the passage between the two chambers
- the dead stroke of the piston is equal to the valve lift relative to its seat formed by the piston.
- the resting flow rate of brake fluid through the master cylinder is limited by the lifting of the valve relative to its seat. Consequently, to increase this flow, it is necessary to increase the valve lift and therefore increase the dead travel to the pedal, conversely a reduction in the dead travel causes a reduction in the flow.
- a master cylinder comprising means for amplifying the axial displacement, so that during the displacement of the piston, the axial stroke traveled by the valve is greater than the dead stroke of the piston.
- the support means advance while keeping its position reference role, the detachment of the valve by bringing it to its seat being advantageously obtained by tilting the support means around an axis perpendicular to the axis of the master cylinder.
- the present invention advantageously makes it possible, without increasing the number of parts relative to the master cylinders of known type, to increase the maximum flow rate through the master cylinder or to reduce the dead strokes.
- the present invention relates to a master cylinder, in particular a tandem master cylinder comprising at least one piston mounted for sliding sliding in a chamber, provided with a valve maintained at rest in abutment supported by an elastic means against a support means. characterized in that the support means is pivotally mounted in the piston.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the support means is pivotally mounted around an axis perpendicular to the longitudinal axis of the master cylinder.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the support means is pivotally mounted around one of its longitudinal ends.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the end is a portion of a sphere.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the support means is a pin.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the support means is mounted in a hole formed in the piston.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the light has a slit as its cross section.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the largest transverse dimension of the light varies continuously.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the support means is at least at rest in support between a support surface of the valve and a ring with a fallen edge.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the bearing means is driven in tilting by the bearing surface of the valve under the action of the elastic means.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the angle is less than 90 °.
- the present invention also relates to a master cylinder, in particular a tandem master cylinder characterized in that the elastic means is a helical spring.
- Figure 1 is a partial view in longitudinal section of the preferred embodiment of a master cylinder according to the present invention at rest.
- Figure 2 is a detail view of Figure 1.
- a tandem master cylinder comprising a primary hydraulic system 1 comprising a chamber 3 made in a bore 4 provided at one end at the rear of 'a first part of larger diameter 3' and a second end at the front of a second part of smaller diameter 3 ", the parts 3 'and 3" being connected by a shoulder 5.
- a piston 7 comprising a rod 11 provided with a head 9, is slidably mounted in a sealed manner in the chamber 3.
- the piston 7 is actuated by a thrust rod mounted swiveling in the rear of the piston by fixing means (not shown), the push rod is connected to a control rod controlled by a brake pedal (not shown).
- the brake pedal is advantageously assisted by an assistance servomotor.
- the piston head 9 is slidably mounted in a sealed manner in the second part 3 "by means of a sealing cup 10 and the piston tail 11 is guided in translation by a guide ring 12 applied in the part 3 ', sealing is achieved by means of a sealing cup 14, a ring with a dropped edge 13 is mounted in abutment between the shoulder 5 and the guide ring 12.
- the ring with a dropped edge 13 comprises an annular washer 15 of which the radially internal end is extended by a sleeve 17 oriented towards the front and bordering the tail 11.
- a light 37 is formed astride the piston head 9 and the piston tail 11.
- This light 37 crosses the piston, and its section in a plane orthogonal to that of the sheet along the axis X has substantially the shape of a slit, the dimension along the X axis or length of the slit varies continuously according to the height of the light.
- the length of the slot decreases from the upper part (towards the top of the figures) of the light towards the lower part of the light (towards the bottom of the figures).
- the chambers 3 and 19 are placed in communication by means of a passage 23 formed in the piston head.
- the passage 23 has at a first end (towards the front) a part of larger diameter 23 ′ and at a second end opposite the first, a part of smaller diameter 23 ′′.
- the supply chamber 19 is connected to a brake fluid reservoir by sealed means 20.
- a spring 25 is mounted in compression in the chamber 3 between the piston head 9 and the rear face of a piston of the secondary hydraulic system.
- a support means 35 in the preferred embodiment shown in Figures 1 and 2 it is a pin, is pivotally mounted in the lumen 37 around an axis Y perpendicular to the axis X of master cylinder around a longitudinal end 47 bearing on the surface of the bore 4.
- the tilting of the pin 35 is defined by an angle ⁇ less than 90 ° relative to a vertical axis V.
- the longitudinal end 47 is advantageously formed by a portion of a sphere.
- the piston 7 is provided with a valve 27 applied in the passage 23 coaxial with the axis of the piston 7, the valve 27 comprises a rod 28 provided at a first end with a head 29 applied in the part 23 'and at a second end of a bearing surface 31, the rod 28 is mounted in translation in the passage 23 ".
- a spring 32 is mounted in compression between the valve head 29 and a bearing element 33 mounted at one end of the part of smaller diameter 23 "at the front of the piston head 9.
- the preload of the spring 32 is sufficient to tilt the support means 35 around the axis Y by an angle - ⁇ .
- the support means 35 is mounted in transverse support on an internal surface 34 of the lumen 37 in contact between the support surface 31 of the valve stem 28 and at least one periphery 41 radially external to a surface longitudinal annular 39 of the sleeve 17.
- the lumen 37 is advantageously a slot of width substantially greater than the smallest dimension D of the support means 35, and of length substantially equal to two to three times the dimension D in its upper part (towards the top of the drawings) and in its lower part (towards the bottom of the drawings) of length substantially equal to D.
- the distance L between the valve head 29 and the piston 7 forming the valve seat defines the valve lift.
- the distance CM between the longitudinal end 47 of the pin 35 and the periphery 41 of the sleeve 17 defines the dead stroke of the piston.
- A2 is the distance between the periphery 41 of the sleeve 17 and the bearing surface 31 of the valve 27.
- the push rod actuated by the control rod advantageously assisted by a servomotor, puts the piston 7 in translation forward in the direction of arrow 43, the pin 35 then released in tilting, "gets up Pushed back by the rod 28 of the valve 27 under the action of the spring 32, and rocking from the angle - ⁇ towards the rear around the axis Y around the end 47 forming a pivot.
- the valve closes the passage 23 hermetically separating the supply chamber 19 from the chamber 3.
- the piston 7 continues to advance in the direction of the arrow 43 compressing the brake fluid actuating the braking devices located at the wheels.
- the radius of curvature of the end 47 of the pin 35 forming a pivot is also advantageously chosen to optimize tilting.
- valve lifting means also apply to the secondary hydraulic circuit.
- the present invention is not limited to a tilting pin, but any means making it possible to amplify the translation of the valve relative to the stroke of the piston does not depart from the scope of the present invention.
- the present invention is particularly applicable to the automotive industry.
- the invention applies mainly to the braking industry for motor vehicles and in particular for passenger cars.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02735496A EP1385724A1 (fr) | 2001-04-26 | 2002-04-23 | Ma tre-cylindre comportant des moyens de levee de clapet ameliores. |
JP2002585254A JP2004525818A (ja) | 2001-04-26 | 2002-04-23 | 改良型弁揚程手段を備えたマスターシリンダ、特にタンデムマスターシリンダ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/05777 | 2001-04-26 | ||
FR0105777A FR2824032B1 (fr) | 2001-04-26 | 2001-04-26 | Maitre-cylindre, notamment maitre-cylindre tandem comportant des moyens de levee de clapet ameliores |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002087941A1 true WO2002087941A1 (fr) | 2002-11-07 |
Family
ID=8862829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/001399 WO2002087941A1 (fr) | 2001-04-26 | 2002-04-23 | Maître-cylindre comportant des moyens de levee de clapet ameliores. |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1385724A1 (fr) |
JP (1) | JP2004525818A (fr) |
FR (1) | FR2824032B1 (fr) |
WO (1) | WO2002087941A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014213727A1 (de) * | 2014-07-15 | 2016-01-21 | Robert Bosch Gmbh | Hauptbremszylinder und Bremssystem für ein Fahrzeug |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4267697A (en) * | 1978-08-31 | 1981-05-19 | Automotive Products Limited | Hydraulic master cylinder |
US4756160A (en) * | 1985-11-26 | 1988-07-12 | Automotive Products Plc | Hydraulic master cylinder |
US5417067A (en) * | 1994-03-25 | 1995-05-23 | Alliedsignal Inc. | Master cylinder piston |
-
2001
- 2001-04-26 FR FR0105777A patent/FR2824032B1/fr not_active Expired - Fee Related
-
2002
- 2002-04-23 WO PCT/FR2002/001399 patent/WO2002087941A1/fr active Application Filing
- 2002-04-23 JP JP2002585254A patent/JP2004525818A/ja not_active Withdrawn
- 2002-04-23 EP EP02735496A patent/EP1385724A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4267697A (en) * | 1978-08-31 | 1981-05-19 | Automotive Products Limited | Hydraulic master cylinder |
US4756160A (en) * | 1985-11-26 | 1988-07-12 | Automotive Products Plc | Hydraulic master cylinder |
US5417067A (en) * | 1994-03-25 | 1995-05-23 | Alliedsignal Inc. | Master cylinder piston |
Also Published As
Publication number | Publication date |
---|---|
FR2824032A1 (fr) | 2002-10-31 |
EP1385724A1 (fr) | 2004-02-04 |
FR2824032B1 (fr) | 2003-11-07 |
JP2004525818A (ja) | 2004-08-26 |
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