EP0349367A1 - Elektrischer Schalter für einen pneumatischen Bremsservomotor - Google Patents
Elektrischer Schalter für einen pneumatischen Bremsservomotor Download PDFInfo
- Publication number
- EP0349367A1 EP0349367A1 EP89401658A EP89401658A EP0349367A1 EP 0349367 A1 EP0349367 A1 EP 0349367A1 EP 89401658 A EP89401658 A EP 89401658A EP 89401658 A EP89401658 A EP 89401658A EP 0349367 A1 EP0349367 A1 EP 0349367A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- feeler
- body part
- rear wall
- probe
- 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.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
- H01H3/166—Self-adjusting mountings, transmissions and the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
Definitions
- the present invention relates to electrical contactors for pneumatic brake booster, in particular intended to drain motor vehicles.
- the present invention relates to electrical contactors, intended to be connected to an electric brake warning circuit and to be mounted in sealed engagement in an orifice in a rear wall of a pneumatic servomotor housing divided into a front chamber and a rear chamber selectively intercommunicating by means of a piston displaceable from a rest position close to the rear wall,
- the contactor being of the type comprising a body of plastic material with a first body part intended to be engaged in the opening of the rear wall of the booster housing and a second part of the body remaining outside the booster housing and containing at least one pair of metallic electrical contacts actuated by a probe mounted sliding in a bore of the first body part and biased by a spring towards the outside of this first part of co rps to wear normally against the piston means when the latter is in the vicinity of its rest position, the pair of contacts comprising a fixed contact blade and a movable contact blade resiliently biased away from the fixed contact blade in the direction opposite to the direction of bias of the probe and coupled to a plunger.
- the probe is formed internally with a central cylindrical housing in which slides a part of enlarged diameter of a plunger comprising, at its end close to the probe head, an annular flange and, at its opposite end, another annular flange, the two flanges being connected to the part of enlarged diameter of the plunger by parts of reduced diameter.
- the probe further comprises an annular abutment projecting radially inwards into the housing and capable of cooperating with the rear face of the flange or end flange of the plunger.
- the object of the present invention is to provide an electrical contactor of the aforementioned type, the mounting of which makes it possible to take account of the positioning tolerances at rest between the piston means and the rear wall of the actuator housing, and which establishes the brake warning contact at the very start of the braking period.
- the invention provides for connecting the plunger to the feeler by a one-way elastic engagement means.
- the plunger takes a position relative to the feeler which depends on the positioning tolerances at rest between the piston means and the rear wall of the actuator housing, and "memorizes" this position once and for all.
- the brake warning contact is established as soon as the piston means has traveled a distance equal to that which separates the contact pad of the movable blade from the fixed contact blade, a distance which can be made as small. as desired, and which does not depend on the manufacturing tolerances of the actuator.
- FIG. 1 there is shown a portion of the rear wall 1 of a pneumatic brake booster housing divided internally by a piston means 2 into a front chamber, or vacuum chamber 3, and a rear chamber , or working chamber 4 between the piston means 2 and the rear wall 1.
- This rear wall 1 has an orifice 5 in which is mounted by unidirectional elastic engagement a first body part 6 of an electrical contactor also comprising a second part body 7 remaining outside the rear wall 1 of the booster housing, the two body parts 6 and 7 being formed in one piece from a plastic material having a certain elasticity to allow the elastic engagement of the first body part 6 in the orifice 5 and its retention locked in place in the latter.
- the first body part 6 has a generally cylindrical configuration and is provided peripherally with an annular seal 8 intended, in mounting configuration, to be compressed between the rear outer face of the rear wall 1 and an annular shoulder 9 defined around the first body part 6 by the front face of the second body part 7.
- the mounting of the contactor on the rear wall 1 can be carried out according to any known method.
- the so-called "bayonet” arrangement can be used, the first body part 6 comprising for this purpose radial protrusions 12, only one of which is shown.
- the first body part 6 comprises a central part 10 formed with a central bore 11, in which is slidably mounted a probe 13 carrying a end head 14 intended to bear against the rear face of the piston means 2 of the booster.
- the cylindrical part of the probe 13 is provided, on its periphery, with axial grooves 24, allowing the working chamber 4 to communicate with the interior of a cavity 40 situated behind the probe 13, as described in document FR-A-2,561,817.
- the probe 13 is formed internally with a cylindrical central housing 16, delimited at the end opposite to that which carries the head 14, by a wall 25 comprising an opening 26 of the general shape of a circle, whose diameter varies linearly between the two edges of the wall 25, so that the opening 26 defines in the wall 25 a volume of generally frustoconical shape whose small base is on the side of the head 14.
- a plunger 15 is provided, the head of which penetrates through the opening 26 in the housing 16.
- the head of the plunger 15 has the general shape of a cylinder, and has at its periphery contiguous circular grooves 30, formed in a plane perpendicular to the axis of the plunger.
- Each groove has in section the shape of a "V" of which one side 17 is perpendicular to the axis of the cylinder forming the head of the plunger 15, the other side of each groove being inclined on this axis, the inclined side of the groove being located on the side of the head 14 of the probe 13.
- the head of the plunger 15 could also be defined as consisting of a stack of trunks of identical cones, stacked coaxially in the same direction, the small base of one being confused with the large base of the following.
- each elementary truncated cone is equal to that of the wall 25 at the end of the probe 13, and the angle at the top of the cone is equal to that which is formed in the opening 26 of the wall 25 of the probe 13, so that the opening 26 and the grooves 30 have complementary shapes capable of cooperating to form a unidirectional elastic engagement of raised parts formed on one of the parts with recessed parts formed on the other part.
- the probe 13 is biased towards the outside of the first body part 6 in the direction towards the piston means 2, by a helical spring 19 mounted on the periphery of the central part 10 and bearing, on the one hand, on the bottom of an annular groove 27 formed in the part 10, of the same axis as the bore 11, and, on the other hand, on the rear face of the head 14 of the probe 13.
- a fixed contact blade 20 positioned on the front face of the cavity 40 adjacent to the rear wall 1 of the housing servo motor and a movable contact blade 21 made of elastic metal and shaped so as to extend, at rest, at an angle relative to the fixed contact blade 20 away from the latter.
- the movable contact blade 21 is cantilevered by its end remote (not shown) from the plunger 15 and its free end 23 is cut in the shape of a U, and engaged on a part of reduced diameter between the head of the plunger 15 and the foot 22 of the plunger 15 for normally urging the latter to bear against the rear face of the cavity 40 under the effect of the inherent elasticity of the movable contact blade 21.
- the movable contact blade 21 is advantageously crimped by its end remote from the plunger 15 in a cover (not shown) mounted and welded, for example by ultrasound, in an enlarged end of the cavity 40 opposite the first part of body 6 so as to seal off this cavity 40, the cover comprising electrical members for connecting the contact blades 20 and 21 to an electric brake warning circuit (not shown).
- the blade of movable contact 21 is provided with a hemispherical contact establishment zone 28 intended to cooperate with a recessed contact zone 29 of the fixed contact 20.
- the mounting of the contactor according to the present invention is carried out as follows.
- the central part 10 of the first body part 6 is firstly fitted with the gasket 8, the spring 19 is then introduced into the groove 27, then the feeler 13 is inserted into the bore 11 so that the opening 26 in wall 25 cooperates with one of the first grooves formed on the head of plunger 15.
- a collar or sleeve 50 (FIG. 4), bearing on the end of the external part of the first body part 6, and on which will come up against the rear face of the head 14.
- This sleeve fulfills the tripe role of allowing the feeler to engage only on one of the first grooves of the plunger, to protect the spring 19 during transport, and to prevent any excessive sinking accidental probe on the plunger, which would render the contactor unusable.
- This sleeve will be easily removable when the contactor is placed on the rear wall of the booster, by any known process (lines of least resistance, stripping primer, etc.).
- the first body part 6 is introduced into the orifice 5 of the rear wall 1 of the booster housing so as to that the radial protrusions 12 appear in front of radial notches of corresponding shapes and dimensions made at the periphery of the orifice 5.
- the head 14 of the probe 13 is brought to meet the piston means 2 Due to the relative elasticity of the wall 25 of the probe 13, and the resistance opposed by the piston means 2, the plunger 15 penetrates into the opening 26 until the protuberances 12 have passed through the corresponding notches.
- the seal 8 is then compressed, and a rotation of the whole of the contactor brings the protuberances 12 behind the wall 1, thus blocking the contactor in the operating position.
- the opening 26 in the wall 25 of the feeler 13 cooperates with the head of the plunger 15 in the manner of a unidirectional elastic engagement which allows, when the contactor is placed on the rear wall of the booster housing , adjusting the length of the probe / plunger assembly to take account of the positioning tolerances at rest between the piston means 2 and the rear wall 1 of the booster housing.
- the probe 13 follows the movement of the piston means 2 under the effect of the spring 19, causing with it the opening 26 cooperating with the grooves formed on the head of the plunger 15, until it comes to press the contact pad 28 of the movable blade 21 against the fixed contact blade 20, at the against the own elastic stress of the movable contact blade 21.
- the unidirectional elastic engagement between the plunger and the feeler prevents any relative movement between these two parts, the feeler being biased towards the outside of the first body part 6 by the spring 19, while the plunger is biased in the other direction by the inherent elastic force of the movable contact blade 21, the stiffness of which is equal to approximately half that of the spring 19.
- the braking warning contact is always obtained after a stroke of the piston means 2 corresponding to the distance between the contact pad 28 of the movable blade 21 and the fixed contact blade 20 , this stroke being typically a few millimeters. So we get well establishing contact at the very start of the braking period, regardless of manufacturing or mounting tolerances, and without any adjustment.
- Figures 2 and 3 show two other embodiments of contactors according to the invention, the connection between the probe and the plunger being carried out with unidirectional elastic engagement.
- the probe 13 is formed of a head 14, bearing on the rear face of the piston means 2 of the booster, and of a foot 100, having the general shape of a cylinder.
- the foot 100 has at its periphery contiguous circular grooves 110, each groove having in section the shape of a "V", one side 101 of which is perpendicular to the axis of the cylinder forming the foot, and the other side of which 102 is inclined relative to this axis, the inclined side of the groove being on the side of the head 14 of the probe 13.
- the foot of the probe 13 could also be defined as consisting of a stack of trunks of identical cones, stacked coaxially in the same without, the small base of one being confused with the large base of the next.
- the plunger 15 is formed of a cylindrical part 103, sliding in the bore 11, and provided on its periphery, with axial grooves 104, allowing the working chamber 4 to communicate with the interior of the cavity 40.
- the plunger 15 is formed internally with a cylindrical central housing 105, delimited at its end directed towards the side of the head 14 of the probe, by a wall 106 having an opening 107 of the general shape of a circle whose diameter varies linearly between the two edges of the wall 106 so that the opening 107 defines in the wall 106 a volume of generally frusto-conical shape the large base of which is on the side of the head 14 of the feeler 13.
- the other end of the plunger 15 is connected, by a part 108, with a foot 22 cooperating with the movable contact blade 21.
- FIG. 3 there is shown a third embodiment of the plunger and the feeler, which have the connection function with unidirectional elastic engagement, in a contactor whose other elements and operation are identical to those of the two modes of previous achievements.
- the probe 13 has a cylindrical body 200 sliding in the bore 11 of the first body part 6, carrying at one end a head 14, and provided at its other end with a bore 201.
- the bore 201 are internally traced contiguous circular grooves 202, each groove having in section the shape of a "V", one side 203 of which is perpendicular to the axis of the bore 201, and the other side 204 is inclined relative to this axis, the inclined side of the groove being on the side of the head 14 of the probe 13.
- a hole 205 is also provided in the head 14 so as to communicate the spaces located in front and behind the probe 13.
- the plunger 15 is formed by a foot 22 cooperating with the blade 11, this foot 22 being joined by a part 206 to a part 207 in the form of a lyre, the branches of which carry at their ends protrusions or hooks 210, of section in " V ", able to engage in the interior grooves of the probe.
- any type of unidirectional elastic engagement between the feeler and the plunger can be used, such as a clutch linear unidirectional ball or spring.
- the electrical contactor of the invention can also be used to close a circuit when the piston means has traveled a predetermined stroke, the length of this stroke being equal to the distance between the contact pad of the movable blade and the fixed contact blade.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Push-Button Switches (AREA)
- Braking Systems And Boosters (AREA)
- Mechanical Control Devices (AREA)
- Braking Arrangements (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8808584A FR2633443B1 (fr) | 1988-06-27 | 1988-06-27 | Contacteur electrique pour servomoteur pneumatique de freinage |
FR8808584 | 1988-06-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0349367A1 true EP0349367A1 (de) | 1990-01-03 |
EP0349367B1 EP0349367B1 (de) | 1994-05-18 |
Family
ID=9367744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89401658A Expired - Lifetime EP0349367B1 (de) | 1988-06-27 | 1989-06-14 | Elektrischer Schalter für einen pneumatischen Bremsservomotor |
Country Status (9)
Country | Link |
---|---|
US (1) | US5154282A (de) |
EP (1) | EP0349367B1 (de) |
JP (1) | JP2952598B2 (de) |
KR (1) | KR0133285B1 (de) |
DE (1) | DE68915345T2 (de) |
ES (1) | ES2052944T3 (de) |
FR (1) | FR2633443B1 (de) |
PL (1) | PL160916B1 (de) |
YU (1) | YU47324B (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996001756A1 (en) * | 1994-07-07 | 1996-01-25 | Lucas Industries Public Limited Company | Improvements in fluid pressure-operated boosters for vehicle braking systems |
EP0836206A1 (de) * | 1996-10-11 | 1998-04-15 | Bticino S.P.A. | Längenverstellbare Druckknopfantrieb |
EP0840335A2 (de) * | 1996-10-31 | 1998-05-06 | TRW FAHRZEUGELEKTRIK GmbH & CO. KG | Selbstjustierender Stösselschalter, insbesondere KFZ-Bremslichtschalter |
FR2787915A1 (fr) * | 1998-12-23 | 2000-06-30 | Crouzet Automatismes | Interrupteur electrique autoreglable en position |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4215515C1 (de) * | 1992-05-12 | 1993-08-05 | Merit-Elektrik Gmbh, 5270 Gummersbach, De | |
JP3109635B2 (ja) * | 1993-09-17 | 2000-11-20 | アルプス電気株式会社 | プランジャスイッチ |
DE9408914U1 (de) * | 1994-05-31 | 1994-09-29 | Chicony Electronics Co., Ltd., Taipeh/T'ai-pei | Tastenschalter |
US5941374A (en) * | 1995-04-20 | 1999-08-24 | U.S. Controls Corporation | Self-adjusting lid switch with dampening element |
DE19603135C1 (de) * | 1996-01-29 | 1997-03-20 | Trw Fahrzeugelektrik | Selbstjustierender Stößelschalter |
GB9608282D0 (en) * | 1996-04-22 | 1996-06-26 | Delta Schoeller Ltd | Plunger mechanism |
DE19946601C1 (de) * | 1999-09-29 | 2001-06-07 | Bosch Gmbh Robert | Schaltvorrichtung, insbesondere für eine Gastherme |
FR2834089B1 (fr) | 2001-12-24 | 2004-04-02 | Peugeot Citroen Automobiles Sa | Dispositif de rattrapage de dispersion dimensionnelle formant butee reglable, procede de reglage, et application aux pedales d'accelerateurs |
FR2896334B1 (fr) * | 2006-01-19 | 2008-08-22 | Renault Sas | Commutateur electrique pour vehicule automobile |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1038758A (en) * | 1964-04-06 | 1966-08-10 | United Carr Inc | Electrical switch |
DE7308411U (de) * | 1973-03-06 | 1973-06-28 | Luschnat K | Schutzvorrichtung zum Verhindern der unbeabsichtigten Betätigung von Bedienungsknopfen, insbesondere fur elektrische Schalter |
FR2441258A1 (fr) * | 1978-11-10 | 1980-06-06 | Messmer Werner Gmbh Co Kg | Interrupteur a poussoir |
FR2532105A1 (fr) * | 1982-08-16 | 1984-02-24 | Kirsten Elektrotech | Commutateur a poussoir |
US4497987A (en) * | 1981-04-06 | 1985-02-05 | Sweda International, Inc. | Keyboard spacer |
EP0160586A1 (de) * | 1984-03-21 | 1985-11-06 | BENDIX France | Elektrischer Schalter für pneumatischen Bremsungsservomotor |
US4689454A (en) * | 1984-07-07 | 1987-08-25 | Schulte-Elektrotechnik Gmbh & Co. Kg | Electrical push button switch having a splash-proof cylindrical enclosure |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1101866A (en) * | 1910-08-17 | 1914-06-30 | Lovell Mcconnell Mfg Co | Circuit-closer. |
US3821529A (en) * | 1973-01-02 | 1974-06-28 | Illinois Tool Works | Musical instrument pushbutton key operated switch with adjustable plunger key cap |
GB2120853A (en) * | 1982-05-24 | 1983-12-07 | Illinois Tool Works | Liquid contaminant resistant electric switches |
-
1988
- 1988-06-27 FR FR8808584A patent/FR2633443B1/fr not_active Expired - Fee Related
-
1989
- 1989-06-14 EP EP89401658A patent/EP0349367B1/de not_active Expired - Lifetime
- 1989-06-14 DE DE68915345T patent/DE68915345T2/de not_active Expired - Lifetime
- 1989-06-14 ES ES89401658T patent/ES2052944T3/es not_active Expired - Lifetime
- 1989-06-21 YU YU126889A patent/YU47324B/sh unknown
- 1989-06-23 JP JP1159834A patent/JP2952598B2/ja not_active Expired - Lifetime
- 1989-06-26 PL PL1989280242A patent/PL160916B1/pl unknown
- 1989-06-27 KR KR1019890008892A patent/KR0133285B1/ko not_active IP Right Cessation
-
1991
- 1991-07-01 US US07/726,716 patent/US5154282A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1038758A (en) * | 1964-04-06 | 1966-08-10 | United Carr Inc | Electrical switch |
DE7308411U (de) * | 1973-03-06 | 1973-06-28 | Luschnat K | Schutzvorrichtung zum Verhindern der unbeabsichtigten Betätigung von Bedienungsknopfen, insbesondere fur elektrische Schalter |
FR2441258A1 (fr) * | 1978-11-10 | 1980-06-06 | Messmer Werner Gmbh Co Kg | Interrupteur a poussoir |
US4497987A (en) * | 1981-04-06 | 1985-02-05 | Sweda International, Inc. | Keyboard spacer |
FR2532105A1 (fr) * | 1982-08-16 | 1984-02-24 | Kirsten Elektrotech | Commutateur a poussoir |
EP0160586A1 (de) * | 1984-03-21 | 1985-11-06 | BENDIX France | Elektrischer Schalter für pneumatischen Bremsungsservomotor |
US4689454A (en) * | 1984-07-07 | 1987-08-25 | Schulte-Elektrotechnik Gmbh & Co. Kg | Electrical push button switch having a splash-proof cylindrical enclosure |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996001756A1 (en) * | 1994-07-07 | 1996-01-25 | Lucas Industries Public Limited Company | Improvements in fluid pressure-operated boosters for vehicle braking systems |
EP0836206A1 (de) * | 1996-10-11 | 1998-04-15 | Bticino S.P.A. | Längenverstellbare Druckknopfantrieb |
EP0840335A2 (de) * | 1996-10-31 | 1998-05-06 | TRW FAHRZEUGELEKTRIK GmbH & CO. KG | Selbstjustierender Stösselschalter, insbesondere KFZ-Bremslichtschalter |
EP0840335A3 (de) * | 1996-10-31 | 1998-11-25 | TRW FAHRZEUGELEKTRIK GmbH & CO. KG | Selbstjustierender Stösselschalter, insbesondere KFZ-Bremslichtschalter |
FR2787915A1 (fr) * | 1998-12-23 | 2000-06-30 | Crouzet Automatismes | Interrupteur electrique autoreglable en position |
Also Published As
Publication number | Publication date |
---|---|
EP0349367B1 (de) | 1994-05-18 |
FR2633443B1 (fr) | 1995-06-09 |
YU126889A (sh) | 1992-07-20 |
JP2952598B2 (ja) | 1999-09-27 |
YU47324B (sh) | 1995-01-31 |
FR2633443A1 (fr) | 1989-12-29 |
KR0133285B1 (ko) | 1998-04-24 |
KR900000943A (ko) | 1990-01-31 |
PL160916B1 (pl) | 1993-05-31 |
ES2052944T3 (es) | 1994-07-16 |
US5154282A (en) | 1992-10-13 |
DE68915345D1 (de) | 1994-06-23 |
DE68915345T2 (de) | 1994-08-25 |
JPH0244617A (ja) | 1990-02-14 |
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