EP0349367A1 - Electric contactor for a pneumatic braking servo motor - Google Patents

Electric contactor for a pneumatic braking servo motor Download PDF

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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
Application number
EP89401658A
Other languages
German (de)
French (fr)
Other versions
EP0349367B1 (en
Inventor
Pascal Le Normand
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.)
AlliedSignal Europe Services Techniques
Original Assignee
Bendix France SA
AlliedSignal Europe Services Techniques
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 Bendix France SA, AlliedSignal Europe Services Techniques filed Critical Bendix France SA
Publication of EP0349367A1 publication Critical patent/EP0349367A1/en
Application granted granted Critical
Publication of EP0349367B1 publication Critical patent/EP0349367B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
  • Braking Systems And Boosters (AREA)
  • Braking Arrangements (AREA)
  • Mechanical Control Devices (AREA)

Abstract

L'invention concerne un contacteur électrique, destiné à être relié à un circuit électrique d'avertissement de freinage et à être monté à engagement étanche dans un orifice (5) d'une paroi arrière (1) d'un boîtier de servomoteur pneumatique d'assistance au freinage divisé en une chambre avant (3) et une chambre arrière (4) sélectivement intercommunicantes par un moyen de piston (2) déplaçable à partir d'une position de repos voisine de la paroi arrière (1), le contacteur comprenant un corps en matériau plastique avec une première partie de corps (6) destinée à être engagée dans l'ouverture (5) de la paroi arrière (1) et une seconde partie de corps (7) demeurant extérieure au boîtier et renfermant au moins une paire de contacts électriques métalliques (20,21) actionnables par un palpeur (13) muni d'une tête (14) monté coulissant dans un alésage (11) de la première partie de corps (6) et sollicité par un ressort (19) vers l'extérieur de la première partie de corps pour que sa tête porte normalement contre le moyen de piston (2) au voisinage de sa position de repos, la paire de contacts comprenant une lame de contact fixe (20) et une lame de contact mobile (21) sollicitée élastiquement à l'écart de la lame de contact fixe (20) das la direction opposée à la direction de sollicitation du palpeur (13) et couplée à un plongeur (15). Selon l'invention, le plongeur (15) est relié au palpeur (13) par un moyen d'engagement élastique unidirectionnel (26,30 ; 107,110 ; 202,210).The invention relates to an electrical contactor, intended to be connected to an electrical brake warning circuit and to be mounted in sealed engagement in an orifice (5) in a rear wall (1) of a pneumatic servomotor housing d brake assist divided into a front chamber (3) and a rear chamber (4) selectively intercommunicating by a piston means (2) movable from a rest position close to the rear wall (1), the contactor comprising a body of plastic material with a first body part (6) intended to be engaged in the opening (5) of the rear wall (1) and a second body part (7) remaining external to the housing and containing at least one pair of metallic electrical contacts (20,21) actuated by a feeler (13) provided with a head (14) mounted to slide in a bore (11) of the first body part (6) and biased by a spring (19) outward from the first body part so that its head normally bears against the piston means (2) in the vicinity of its rest position, the pair of contacts comprising a fixed contact blade (20) and a movable contact blade (21) elastically urged to away from the fixed contact blade (20) in the direction opposite to the direction of biasing of the probe (13) and coupled to a plunger (15). According to the invention, the plunger (15) is connected to the feeler (13) by a one-way elastic engagement means (26,30; 107,110; 202,210).

Description

La présente invention concerne les contacteurs électriques pour servomoteur pneumatique de freinage, notamment destinés à épuiper les véhicules automobiles.The present invention relates to electrical contactors for pneumatic brake booster, in particular intended to drain motor vehicles.

De façon plus précise, la présente invention concerne les contacteurs électriques, destinés à être reliés à un circuit électrique d'avertissement de freinage et à être montés à engagement étanche dans un orifice d'une paroi arrière d'un boîtier de servomoteur pneumatique divisé en une chambre avant et une chambre arrière sélectivement intercommunicantes par un moyen de piston déplaçable à partir d'une position de repos voisine de la paroi arrière, le contacteur étant du type comprenant un corps en matériau plastique avec une première partie de corps destinée à être engagée dans l'ouverture de la paroi arrière du boîtier du servomoteur et une seconde partie de corps demeurant extérieure au boîtier de servomoteur et renfermant au moins une paire de contacts électriques métalliques actionnables par un palpeur monté coulissant dans un alésage de la première partie de corps et sollicité par un ressort vers l'extérieur de cette première partie de corps pour porter normalement contre le moyen de piston lorsque ce dernier se trouve au voisinage de sa position de repos, la paire de contacts comprenant une lame de contact fixe et une lame de contact mobile sollicitée élastiquement à l'écart de la lame de contact fixe dans la direction opposée à la direction de sollicitation du palpeur et couplée à un plongeur.More specifically, 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.

Un contacteur électrique d'avertissement de freinage de ce type est décrit dans le document FR-A-2 561 817, dont le contenu est supposé intégré ici pour référence. Dans ce document, le palpeur est formé intérieurement avec un logement central cyclindrique dans lequel coulisse une partie de diamètre élargi d'un plongeur comportant, à son extrémité voisine de la tête du palpeur, une bride annulaire et, à son extrémité opposée, une autre bride annulaire, les deux brides étant reliées à la partie de diamètre élargi du plongeur par des parties de diamètre réduit. Le palpeur comporte, en outre, une butée annulaire faisant saillie radialement vers l'intérieur dans le logement et susceptible de coopérer avec la face arrière de la bride ou collerette d'extrémité du plongeur.An electric brake warning switch of this type is described in document FR-A-2 561 817, the content of which is assumed to be incorporated here for reference. In this document, 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.

Dans la configuration de repos, il existe, entre la collerette d'extrémité du plongeur et la butée annulaire du palpur, un jeu qui peut varier dans des proportions notables et accommoder ainsi les tolérances de positionnement au repos entre le moyen de piston et la paroi arrière du boîtier de servomoteur, sans modifier pour autant la position de repos de l'ensemble lame de contact mobile/plongeur. Par contre, en fonctionnement, lorsque le moyen de piston est écarté de la paroi arrière sous l'effet de l'admission de l'air atmosphérique dans la chambre de travail arrière, le palpeur suit le déplacement du moyen de piston, en annulant tout d'abord la course morte, puis en entraînant, par sa butée annulaire intérieure, le plongeur jusqu'a venir plaquer le plot de contact de la lame mobile contre la lame de contact fixe à l'encontre de la sollicitation élastique propre de la lame de contact mobile.In the rest configuration, there is, between the end collar of the plunger and the annular abutment of the palpur, a clearance which can vary in notable proportions and thus accommodate the positioning tolerances at rest between the piston means and the wall. rear of the actuator housing, without changing the rest position of the movable contact blade / plunger assembly. On the other hand, in operation, when the piston means is moved away from the rear wall under the effect of the admission of atmospheric air into the rear working chamber, the probe follows the movement of the piston means, canceling any first the dead stroke, then by driving, by its internal annular stop, the plunger until it comes to press the contact pad of the movable blade against the fixed contact blade against the own elastic stress of the blade of mobile contact.

Le jeu précité étant susceptible de varier dans des proportions notables, le contact sera donc établi à des instants différents de la course du moyen de piston, et donc à des moments différents du freinage. Il en résulte donc l'inconvénient que l'avertissement de freinage peut n'avoir lieu que lorsque le freinage est déjà devenu effectif, alors qu'il est souhaitable que l'avertissement de freinage ait lieu le plus tôt possible.The aforementioned clearance being likely to vary in notable proportions, the contact will therefore be established at different times of the stroke of the piston means, and therefore at different times of braking. This therefore results in the disadvantage that the braking warning may only take place when braking has already become effective, while it is desirable that the braking warning takes place as soon as possible.

Pour pallier cet inconvénient, la présente invention a pour objet de proposer un contacteur électrique du type précité, dont le montage permette de tenir compte des tolérances de positionnement au repos entre le moyen de piston et la paroi arrière du boîtier de servomoteur, et qui établisse le contact d'avertissement de freinage au tout début de la période de freinage.To overcome this drawback, 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.

Dans ce but, l'invention prévoit de relier le plongeur au palpeur par un moyen d'engagement élastique unidirectionnel.To this end, the invention provides for connecting the plunger to the feeler by a one-way elastic engagement means.

De cette façon, lors du montage du contacteur selon l'invention sur la paroi arrière du boîtier du servomoteur pneumatique d'assistance au freinage, le plongeur prend par rapport au palpeur une position qui dépend des tolérances de positionnement au repos entre le moyen de piston et la paroi arrière du boîtier de servomoteur, et "mémorise" cette position une fois pour toutes. Il en résulte que le contact d'avertissement de freinage est établi dès que le moyen de piston a parcouru une distance égale à celle qui sépare le plot de contact de la lame mobile de la lame de contact fixe, distance qui peut être rendu aussi faible qu'on le désire, et qui ne dépend pas des tolérances de fabrication du servomoteur.In this way, when the contactor according to the invention is mounted on the rear wall of the casing of the pneumatic brake booster, 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. As a result, 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.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description suivante, donnée à titre illustratif, faite en relation avec le dessin annexé sur lequel :

  • - la Figure 1 représente une vue en coupe longitudinale d'un premier mode de réalisation d'un contacteur électrique selon l'invention monté en place sur la paroi arrière d'un boîtier de servomoteur pneumatique d'assistance au freinage,
  • - la Figure 2 est une vue analogue à celle de la Figure 1, d'un deuxième mode de réalisation de l'invention,
  • - la Figure 3 est une vue analogue aux deux précédentes, d'un troisième mode de réalisation de l'invention, et
  • - la Figure 4 est une vue en coupe d'un contacteur prêt à être installé.
Other characteristics and advantages of the present invention will emerge from the following description, given by way of illustration, made in conjunction with the appended drawing in which:
  • FIG. 1 represents a view in longitudinal section of a first embodiment of an electrical contactor according to the invention mounted in place on the rear wall of a pneumatic brake booster housing,
  • FIG. 2 is a view similar to that of FIG. 1, of a second embodiment of the invention,
  • FIG. 3 is a view similar to the previous two, of a third embodiment of the invention, and
  • - Figure 4 is a sectional view of a contactor ready to be installed.

Sur les Figures, les éléments identiques portent le même numéro de référence.In the Figures, identical elements have the same reference number.

Sur la Figure 1, on a représenté une portion de la paroi arrière 1 d'un boîtier de servomoteur pneumatique d'assistance au freinage divisé intérieurement par un moyen de piston 2 en une chambre avant, ou chambre à vide 3, et une chambre arrière, ou chambre de travail 4 entre le moyen de piston 2 et la paroi arrière 1. Cette paroi arrière 1 comporte un orifice 5 dans lequel est montée par engagement élastique unidirectionnel une première partie de corps 6 d'un contacteur électrique comprenant également une seconde partie de corps 7 demeurant extérieure à la paroi arrière 1 du boîtier de servomoteur, les deux parties de corps 6 et 7 étant formées d'une seule pièce à partir d'un matériau plastique présentant une certaine élasticité pour permettre l'engagement élastique de la première partie de corps 6 dans l'orifice 5 et son maintien verrouillé en place dans ce dernier. La première partie de corps 6 présente une configuration générale cylindrique et est pourvue périphériquement d'un joint d'étanchéité annulaire 8 destiné, en configuration de montage, à être comprimé entre la face extérieure arrière de la paroi arrière 1 et un épaulement annulaire 9 défini autour de la première partie de corps 6 par la face avant de la seconde partie de corps 7.In Figure 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.

Le montage du contacteur sur la paroi arrière 1 peut être effectué selon tout procédé connu. Avantageusement, le montage dit "à baïonnette" pourra être utilisé, la première partie de corps 6 comportant à cet effet des excroissances radiales 12, dont une seule est représentée.The mounting of the contactor on the rear wall 1 can be carried out according to any known method. Advantageously, 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.

La première partie de corps 6 comporte une partie centrale 10 formée avec un alésage central 11, dans lequel est monté coulissant un palpeur 13 portant une tête d'extrémité 14 destinée à porter en appui contre la face arrière du moyen de piston 2 du servomoteur. La partie cylindrique du palpeur 13 est munie, sur sa périphérie, de rainures axiales 24, permettant à la chambre de travail 4 de communiquer avec l'intérieur d'une cavité 40 située en arrière du palpeur 13, ainsi qu'il est décrit dans le document FR-A-2 561 817.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.

Conformément à l'invention, le palpeur 13 est formé intérieurement avec un logement central cylindrique 16, délimité à l'extrémité opposée à celle qui porte la tête 14, par une paroi 25 comportant une ouverture 26 de la forme générale d'un cercle, dont le diamètre varie linéairement entre les deux bords de la paroi 25, de façon à ce que l'ouverture 26 définisse dans la paroi 25 un volume de forme générale troncônique dont la petite base est du côté de la tête 14.According to the invention, 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.

Conformément à l'invention, un plongeur 15 est prévu, dont la tête pénètre par l'ouverture 26 dans le logement 16.According to the invention, a plunger 15 is provided, the head of which penetrates through the opening 26 in the housing 16.

La tête du plongeur 15 a la forme générale d'un cylindre, et comporte à sa périphérie des sillons circulaires jointifs 30, formés dans un plan perpendiculaire à l'axe du plongeur. Chaque sillon a en section la forme d'un "V" dont un côté 17 est perpendiculaire à l'axe du cylindre formant la tête du plongeur 15, l'autre côté de chaque sillon étant incliné sur cet axe, le côté incliné du sillon étant situé du côté de la tête 14 du palpeur 13. La tête du plongeur 15 pourrait aussi être définie comme étant constituée d'un empilement de troncs de cônes indentiques, empilés coaxialement dans le même sens, la petite base de l'un étant confondue avec la grande base du suivant. De façon avantageuse, l'épaisseur de chaque tronc de cône élémentaire est égale à celle de la paroi 25 à l'extrémité du palpeur 13, et l'angle au sommet du cône est égal à celui qui est formé dans l'ouverture 26 de la paroi 25 du palpeur 13, de façon à ce que l'ouverture 26 et les sillons 30 aient des formes complémentaires aptes à coopérer pour former un engagement élastique unidirectionnel de parties en relief formées sur l'une des pièces avec des parties en creux formées sur l'autre pièce.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. Advantageously, the thickness of 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.

Le palpeur 13 est sollicité vers l'extérieur de la première partie de corps 6 dans la direction vers le moyen de piston 2, par un ressort hélicoïdal 19 monté sur la périphérie de la partie centrale 10 et prenant appui, d'une part, sur le fond d'une gorge annulaire 27 formée dans la partie 10, de même axe que l'alésage 11, et, d'autre part, sur la face arrière de la tête 14 du palpeur 13.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.

Comme décrit dans le document précité, dans la cavité allongée 40 de la seconde partie de corps 7 du contacteur sont montées perpendiculairement au plongeur 15 une lame de contact fixe 20 positionnée sur la face avant de la cavité 40 voisine de la paroi arrière 1 du boîtier de servomoteur et une lame de contact mobile 21 réalisée en métal élastique et conformée de façon à s'étendre, au repos, suivant un angle par rapport à la lame de contact fixe 20 à l'écart de celle-ci. Typiquement, la lame de contact mobile 21 est montée en porte-à-faux par son extrémité éloignée (non représentée) du plongeur 15 et son extrémité libre 23 est découpée en forme du U, et engagée sur une partie de diamètre réduit entre la tête du plongeur 15 et le pied 22 du plongeur 15 pour solliciter normalement ce dernier en appui contre la face arrière de la cavité 40 sous l'effet de l'élasticité propre de la lame de contact mobile 21.As described in the aforementioned document, in the elongated cavity 40 of the second body part 7 of the contactor are mounted perpendicular to the plunger 15 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. Typically, 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.

Comme décrit dans le document précité, la lame de contact mobile 21 est avantageusement sertie par son extrémité éloignée du plongeur 15 dans un couvercle (non représenté) monté et soudé, par exemple aux ultrasons, dans une extrémité élargie de la cavité 40 opposée à la première partie de corps 6 de façon à clore de manière étanche cette cavité 40, le couvercle comportant des organes électriques de raccordement des lames de contact 20 et 21 à un circuit électrique d'avertissement de freinage (non représenté). De préférence, la lame de contact mobile 21 est pourvue d'un zone d'établissement de contact hémisphérique 28 destinée à coopérer avec une zone de contact en creux 29 du contact fixe 20.As described in the aforementioned document, 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). Preferably, 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.

Le montage du contacteur selon la présente invention s'effectue de la façon suivante. La partie centrale 10 de la première partie de corps 6 est tout d'abord équipée du joint 8, le ressort 19 est ensuite introduit dans la gorge 27, puis le palpeur 13 est inséré dans l'alésage 11 de manière à ce que l'ouverture 26 dans la paroi 25 coopère avec un des premiers sillons formés sur la tête du plongeur 15.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.

Avant l'introduction du palpeur 13 dans l'alésage 11, on peut avantageusement prévoir de disposer un collier ou manchon 50 (Figure 4), prenant appui sur l'extrémité de la partie extérieure de la première partie de corps 6, et sur lequel viendra buter la face arrière de la tête 14. Ce manchon remplit le tripe rôle de permettre au palpeur de ne s'engager que sur un des premiers sillons du plongeur, de protéger le ressort 19 pendant le transport, et d'empêcher tout enfoncement exagéré accidentel du palpeur sur le plongeur, ce qui rendrait le contacteur inutilisable. Ce manchon sera facilement arrachable au moment de la mise en place du contacteur sur la paroi arrière du servomoteur, par tout procédé connu (lignes de moindre résistance, amorce d'arrachage, etc...).Before the introduction of the probe 13 into the bore 11, provision may advantageously be made for placing 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.).

L'ensemble étant ainsi préparé et tel qu'il est représenté sur la figure 4, après avoir arraché le manchon 50, on introduit la première partie de corps 6 dans l'orifice 5 de la paroi arrière 1 du boîtier de servomoteur de façon à ce que les excroissances radiales 12 se présentent en face d'échancrures radiales de formes et de dimensions correspondantes pratiquées à la périphérie de l'orifice 5. Lors de cette introduction, la tête 14 du palpeur 13 est amenée à rencontrer le moyen de piston 2. Du fait de l'élasticité relative de la paroi 25 du palpeur 13, et de la résistance opposée par le moyen de piston 2, le plongeur 15 pénètre dans l'ouverture 26 jusqu'à ce que les excroissances 12 aient traversé les échancrures correspondantes. Le joint 8 se trouve alors comprimé, et une rotation de l'ensemble du contacteur amène les excroissances 12 derrière la paroi 1, bloquant ainsi le contacteur en position de fonctionnement.The assembly being thus prepared and as shown in FIG. 4, after having torn off the sleeve 50, 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. During this introduction, 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.

On voit donc que l'ouverture 26 dans la paroi 25 du palpeur 13 coopère avec la tête du plongeur 15 à la façon d'un engagement élastique unidirectionnel qui permet, lors de la mise en place du contacteur sur la paroi arrière du boîtier de servomoteur, l'ajustement de la longueur de l'ensemble palpeur/plongeur pour tenir compte des tolérances de positionnement au repos entre le moyen de piston 2 et la paroi arrière 1 du boîtier de servomoteur.It can therefore be seen that 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.

En fonctionnement, lorsque le moyen de piston 2 est écarté de la paroi arrière 1 sous l'effet de l'admission de l'air atmosphérique dans la chambre de travail arrière, le palpeur 13 suit le déplacement du moyen de piston 2 sous l'effet du ressort 19, entraînant avec lui, l'ouverture 26 coopérant avec les sillons formés sur la tête du plongeur 15, jusqu'à venir plaquer le plot de contact 28 de la lame mobile 21 contre la lame de contact fixe 20, à l'encontre de la sollicitation élastique propre de la lame de contact mobile 21. L'engagement élastique unidirectionnel entre le plongeur et le palpeur empêche tout mouvement relatif entre ces deux pièces, le palpeur étant sollicité vers l'extérieur de la première partie de corps 6 par le ressort 19, tandis que le plongeur est sollicité dans l'autre sens par la force élastique propre de la lame de contact mobile 21, dont la raideur est égale à environ la moitié de celle du ressort 19.In operation, when the piston means 2 is moved away from the rear wall 1 under the effect of the admission of atmospheric air into the rear working chamber, 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.

On voit donc que grâce à l'invention, le contact d'avertissement de freinage est toujours obtenu après une course du moyen de piston 2 correspondant à la distance entre le plot de contact 28 de la lame mobile 21 et la lame de contact fixe 20, cette course étant typiquement de quelques millimètres. On obtient donc bien l'établissement du contact au tout début de la période de freinage, quelles que soient les tolérances de fabrication ou de montage, et sans aucun réglage.It can therefore be seen that, thanks to the invention, 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.

Les figures 2 et 3 représentent deux autres modes de réalisation de contacteurs selon l'invention, la liaison entre le palpeur et le plongeur étant réalisée avec engagement élastique unidirectionnel.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.

Sur la Figure 2, le palpeur 13 est formé d'une tête 14, venant en appui sur la face arrière du moyen de piston 2 du servomoteur, et d'un pied 100, ayant la forme générale d'un cylindre. Le pied 100 comporte à sa périphérie des sillons circulaires jointifs 110, chaque sillon ayant en section la forme d'un "V", dont un côté 101 est perpendiculaire à l'axe du cylindre formant le pied, et dont l'autre côté 102 est incliné par rapport à cet axe, le côté incliné du sillon se trouvant du côté de la tête 14 du palpeur 13. Le pied du palpeur 13 pourrait aussi être défini comme étant constitué d'un empilement de troncs de cônes identiques, empilés coaxialement dans le même sans, la petite base de l'un étant confondue avec la grande base du suivant.In Figure 2, 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.

Le plongeur 15 est formé d'une partie cylindrique 103, coulissant dans l'alésage 11, et munie sur sa périphérie, de rainures axiales 104, permettant à la chambre de travail 4 de communiquer avec l'intérieur de la cavité 40. Le plongeur 15 est formé intérieurement avec un logement central cylindrique 105, délimité à son extrémité dirigée du côté de la tête 14 du palpeur, par une paroi 106 comportant une ouverture 107 de la forme générale d'un cercle dont le diamètre varie linéairement entre les deux bords de la paroi 106 de façon à ce que l'ouverture 107 définisse dans la paroi 106 un volume de forme générale troncônique dont la grande base est du côté de la tête 14 du palpeur 13. L'autre extrémité du plongeur 15 est reliée, par une partie 108, à un pied 22 coopérant avec la lame de contact mobile 21.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.

Les autres éléments du contacteur de la figure 2 sont identiques à ceux de la Figure 1, et son fonctionnement est identique, seuls le plongeur et le palpeur ont été modifiés, mais remplissent toujours la même fonction de liaison avec engagement élastique unidirectionnel.The other elements of the contactor in Figure 2 are identical to those in Figure 1, and its operation is identical, only the plunger and the probe have been modified, but still fulfill the same connection function with unidirectional elastic engagement.

De même, sur la Figure 3, on a représenté un troisième mode de réalisation du plongeur et du palpeur, qui ont la fonction de liaison avec engagement élastique unidirectionnel, dans un contacteur dont les autres éléments et le fonctionnement sont identiques à ceux des deux modes de réalisation précédentes.Similarly, in Figure 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.

Selon la mode de réalisation de la figure 3, le palpeur 13 comporte un corps cylindrique 200 coulissant dans l'alésage 11 de la première partie de corps 6, portant a une extrémité une tête 14, et muni à son autre extrémité d'un alésage 201. Dans l'alésage 201 sont tracés intérieurement des sillons circulaires jointifs 202, chaque sillon ayant en section la forme d'un "V", dont un côté 203 est perpendiculaire à l'axe de l'alésage 201, et dont l'autre côté 204 est incliné par rapport à cet axe, le côté incliné du sillon se trouvant du côté de la tête 14 du palpeur 13. Un perçage 205 est de plus prévu dans la tête 14 de façon à faire communiquer les espaces situés devant et derrière le palpeur 13.According to the embodiment of Figure 3, 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. In 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.

Le plongeur 15 est formé d'un pied 22 coopérant avec la lame 11, ce pied 22 étant réuni par une partie 206 à une partie 207 en forme de lyre dont les branches portent à leurs extrémités des protubérances ou crochets 210, de section en "V", aptes à s'engager dans les sillons intérieurs du palpeur.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.

Les autres éléments du contacteur de la Figure 3 et son fonctionnement sont identiques à ceux des deux autres modes de réalisation.The other elements of the contactor of Figure 3 and its operation are identical to those of the other two embodiments.

Ayant ainsi décrit trois modes de réalisation de l'invention, il est clair que de nombreuses modifications pourront y être apportées par l'homme du métier sans pour autant sortir de son cadre. Ainsi tout type d'engagement élastique unidirectionnel entre le palpeur et le plongeur peut être utilisé, comme par exemple un embrayage linéaire unidirectionnel à bille ou à ressort. De même on pourra prévoir que l'engagement entre le plongeur et le palpeur soit réalisé sur plusieurs sillons, et/ou que les parties sur lesquelles cet engagement est réalisé aient une autre forme que cylindrique et circulaire, par exemple soient carrées ou rectangulaires.Having thus described three embodiments of the invention, it is clear that many modifications can be made to it by a person skilled in the art without going beyond its ambit. Thus any type of unidirectional elastic engagement between the feeler and the plunger can be used, such as a clutch linear unidirectional ball or spring. Likewise, provision may be made for the engagement between the plunger and the feeler to be carried out on several grooves, and / or for the parts on which this engagement is carried out to have a shape other than cylindrical and circular, for example being square or rectangular.

Enfin, bien qu'ayant été décrit plus particulièrement pour les circuits électriques d'avertissement de freinage, il est bien clair que le contacteur électrique de l'invention peut également servir à fermer un circuit lorsque le moyen de piston a parcouru une course prédéterminée, la longueur de cette course étant égale à la distance entre le plot de contact de la lame mobile et la lame de contact fixe.Finally, although having been described more particularly for the electric brake warning circuits, it is very clear that 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.

Claims (8)

1. Contacteur électrique, pour servomoteur pneumatique de freinage, destiné à être monté à engagement étanche dans un orifice (5) d'une paroi arrière (1) d'un boîtier de servomoteur pneumatique d'assistance au freinage divisé en une chambre avant (3) et une chambre arrière (4) sélectivement intercommunicantes par un moyen de piston (2) déplaçable à partir d'une position de repos voisine de la paroi arrière (1), le contacteur comprenant un corps en matériau plastique ave une première partie de corps (6) destinée à être engagée dans l'ouverture (5) de la paroi arrière (1) et une seconde partie de corps (7) demeurant extérieure au boîtier et renfermant au moins une paire de contacts électriques métalliques (20,21) actionnables par un palpeur (13) muni d'une tête (14) monté coulissant dans un alésage (11) de la première partie de corps (6) et sollicité par un ressort (19) vers l'extérieur de la première partie de corps pour que sa tête porte normalement contre le moyen de piston (2) au voisinage de sa position de repos, la paire de contacts comprenant une lame de contact fixe (20) et une lame de contact mobile (21) sollicitée élastiquement à l'écart de la lame de contact fixe (20) dans la direction opposée à la direction de sollicitation du palpur (13) et couplée à un plongeur (15), caractérisé en ce que le plongeur (15) est relié au palpeur (13) par un moyen d'engagement élastique unidirectionnel (26,30 ; 107,110 ; 202,210).1. Electric contactor, for pneumatic brake booster, intended to be mounted in sealed engagement in an orifice (5) of a rear wall (1) of a pneumatic brake booster housing divided into a front chamber ( 3) and a rear chamber (4) selectively intercommunicating by a piston means (2) movable from a rest position close to the rear wall (1), the contactor comprising a body of plastic material with a first part of body (6) intended to be engaged in the opening (5) of the rear wall (1) and a second body part (7) remaining outside the housing and containing at least one pair of metallic electrical contacts (20,21) actuated by a feeler (13) provided with a head (14) slidably mounted in a bore (11) of the first body part (6) and biased by a spring (19) towards the outside of the first body part so that his head normally wears c ontre the piston means (2) near its rest position, the pair of contacts comprising a fixed contact blade (20) and a movable contact blade (21) resiliently biased away from the fixed contact blade (20) in the direction opposite to the urging direction of the palpur (13) and coupled to a plunger (15), characterized in that the plunger (15) is connected to the feeler (13) by a one-way elastic engagement means (26.30; 107.110; 202,210). 2. Contacteur électrique selon la revendication 1, caractérisé en ce que le moyen d'engagement élastique unidirectionnel entre le plongeur et le palpeur est obtenu par la coopération de parties en relief formées sur le plonger et/ou le palpeur avec des parties en creux formées sur le palpeur et/ou le plongeur.2. Electrical contactor according to claim 1, characterized in that the unidirectional elastic engagement means between the plunger and the feeler is obtained by the cooperation of raised parts formed on the plunge and / or the feeler with hollow parts formed on the probe and / or the plunger. 3. Contacteur électrique selon la revendication 2, caractérisé en ce que les parties en creux formées sur le plongeur et/ou le palpeur sont des sillons (30,110,202).3. Electrical contactor according to claim 2, characterized in that the recessed parts formed on the plunger and / or feeler are grooves (30,110,202). 4. Contacteur électrique selon la revendication 3, caractérisé en ce que les sillons (30,110,202) sont circulaires dans un plan perpendiculaire à l'axe de symétrie du plongeur et/ou du palpeur sur lequel ils sont formés.4. Electrical contactor according to claim 3, characterized in that the grooves (30,110,202) are circular in a plane perpendicular to the axis of symmetry of the plunger and / or the feeler on which they are formed. 5. Contacteur électrique selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte, entre l'extrémité de la partie extérieure de la première partie de corps (6) et la face arrière de la tête (14) du palpeur (13), un manchon (50).5. Electrical contactor according to any one of the preceding claims, characterized in that it comprises, between the end of the outer part of the first body part (6) and the rear face of the head (14) of the probe (13), a sleeve (50). 6. Contacteur électrique selon la revendication 5, caractérisé en ce que le manchon (50) est facilement arrachable au moment de la mise en place du contacteur sur la paroi arrière du servomoteur.6. Electrical contactor according to claim 5, characterized in that the sleeve (50) is easily detachable when the contactor is placed on the rear wall of the booster. 7. Manchon, caractérisé en ce qu'il est destiné à être disposé sur un contacteur électrique selon l'une quelconque des revendications précédentes.7. Sleeve, characterized in that it is intended to be disposed on an electrical contactor according to any one of the preceding claims. 8. Servomoteur pneumatique d'assistance au freinage, caractérisé en ce qu'il est équipé d'un contacteur électrique selon l'une quelconque des revendications 1 à 4.8. Pneumatic brake booster, characterized in that it is equipped with an electrical contactor according to any one of claims 1 to 4.
EP89401658A 1988-06-27 1989-06-14 Electric contactor for a pneumatic braking servo motor Expired - Lifetime EP0349367B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808584 1988-06-27
FR8808584A FR2633443B1 (en) 1988-06-27 1988-06-27 ELECTRIC CONTACTOR FOR PNEUMATIC BRAKE SERVOMOTOR

Publications (2)

Publication Number Publication Date
EP0349367A1 true EP0349367A1 (en) 1990-01-03
EP0349367B1 EP0349367B1 (en) 1994-05-18

Family

ID=9367744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401658A Expired - Lifetime EP0349367B1 (en) 1988-06-27 1989-06-14 Electric contactor for a pneumatic braking servo motor

Country Status (9)

Country Link
US (1) US5154282A (en)
EP (1) EP0349367B1 (en)
JP (1) JP2952598B2 (en)
KR (1) KR0133285B1 (en)
DE (1) DE68915345T2 (en)
ES (1) ES2052944T3 (en)
FR (1) FR2633443B1 (en)
PL (1) PL160916B1 (en)
YU (1) YU47324B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
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 (en) * 1996-10-11 1998-04-15 Bticino S.P.A. An adjustable length push-button actuator
EP0840335A2 (en) * 1996-10-31 1998-05-06 TRW FAHRZEUGELEKTRIK GmbH & CO. KG Self-adjusting tappet-switch, in particular a brake ligth switch
FR2787915A1 (en) * 1998-12-23 2000-06-30 Crouzet Automatismes Self-adjusting electric contact switch for detecting opening of motor vehicle doors has pushrod sliding in body and serrated surface holding body at determined position

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DE4215515C1 (en) * 1992-05-12 1993-08-05 Merit-Elektrik Gmbh, 5270 Gummersbach, De
JP3109635B2 (en) * 1993-09-17 2000-11-20 アルプス電気株式会社 Plunger switch
DE9408914U1 (en) * 1994-05-31 1994-09-29 Chicony Electronics Co., Ltd., Taipeh/T'ai-pei Key switch
US5941374A (en) * 1995-04-20 1999-08-24 U.S. Controls Corporation Self-adjusting lid switch with dampening element
DE19603135C1 (en) * 1996-01-29 1997-03-20 Trw Fahrzeugelektrik Self-adjusting plunger-type switch e.g. for automobile brake light
GB9608282D0 (en) * 1996-04-22 1996-06-26 Delta Schoeller Ltd Plunger mechanism
DE19946601C1 (en) * 1999-09-29 2001-06-07 Bosch Gmbh Robert Switching device, in particular for a gas boiler
FR2834089B1 (en) 2001-12-24 2004-04-02 Peugeot Citroen Automobiles Sa ADJUSTMENT OF DIMENSIONAL DISPERSION FORMING ADJUSTABLE STOP, ADJUSTMENT METHOD, AND APPLICATION TO ACCELERATOR PEDALS
FR2896334B1 (en) * 2006-01-19 2008-08-22 Renault Sas ELECTRICAL SWITCH FOR MOTOR VEHICLE

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GB1038758A (en) * 1964-04-06 1966-08-10 United Carr Inc Electrical switch
DE7308411U (en) * 1973-03-06 1973-06-28 Luschnat K Protective device to prevent the inadvertent actuation of control buttons, in particular for electrical switches
FR2441258A1 (en) * 1978-11-10 1980-06-06 Messmer Werner Gmbh Co Kg PUSH-BUTTON SWITCH
US4497987A (en) * 1981-04-06 1985-02-05 Sweda International, Inc. Keyboard spacer
FR2532105A1 (en) * 1982-08-16 1984-02-24 Kirsten Elektrotech Vehicle braking indicator lamp switch
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Cited By (5)

* Cited by examiner, † Cited by third party
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 (en) * 1996-10-11 1998-04-15 Bticino S.P.A. An adjustable length push-button actuator
EP0840335A2 (en) * 1996-10-31 1998-05-06 TRW FAHRZEUGELEKTRIK GmbH & CO. KG Self-adjusting tappet-switch, in particular a brake ligth switch
EP0840335A3 (en) * 1996-10-31 1998-11-25 TRW FAHRZEUGELEKTRIK GmbH & CO. KG Self-adjusting tappet-switch, in particular a brake ligth switch
FR2787915A1 (en) * 1998-12-23 2000-06-30 Crouzet Automatismes Self-adjusting electric contact switch for detecting opening of motor vehicle doors has pushrod sliding in body and serrated surface holding body at determined position

Also Published As

Publication number Publication date
JP2952598B2 (en) 1999-09-27
KR900000943A (en) 1990-01-31
JPH0244617A (en) 1990-02-14
US5154282A (en) 1992-10-13
YU126889A (en) 1992-07-20
FR2633443A1 (en) 1989-12-29
DE68915345D1 (en) 1994-06-23
DE68915345T2 (en) 1994-08-25
EP0349367B1 (en) 1994-05-18
PL160916B1 (en) 1993-05-31
YU47324B (en) 1995-01-31
ES2052944T3 (en) 1994-07-16
KR0133285B1 (en) 1998-04-24
FR2633443B1 (en) 1995-06-09

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