EP1252050A1 - Method for making a master cylinder and master cylinder obtained by said method - Google Patents

Method for making a master cylinder and master cylinder obtained by said method

Info

Publication number
EP1252050A1
EP1252050A1 EP01904011A EP01904011A EP1252050A1 EP 1252050 A1 EP1252050 A1 EP 1252050A1 EP 01904011 A EP01904011 A EP 01904011A EP 01904011 A EP01904011 A EP 01904011A EP 1252050 A1 EP1252050 A1 EP 1252050A1
Authority
EP
European Patent Office
Prior art keywords
master cylinder
valve
dead
adjustment
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01904011A
Other languages
German (de)
French (fr)
Inventor
Henry Pagot
Félix Masjuan
Tomas Leon
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1252050A1 publication Critical patent/EP1252050A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/20—Tandem, side-by-side, or other multiple master cylinder units

Definitions

  • the present invention relates mainly to a method for manufacturing a master cylinder, in particular a tandem master cylinder comprising a step for adjusting the dead travel and to a master cylinder obtained by said method.
  • tandem valve master cylinders in braking systems delivering, on command, a high pressure brake fluid capable of actuating the brakes associated with the wheels of a motor vehicle.
  • the displacement of a control rod by a brake pedal advantageously assisted by a pneumatic servomotor, causes a push rod which in turn displaces at least one piston of the tandem master cylinder and reduces the internal volume of at least one chamber filled with brake fluid, the pressure of which is increased.
  • dead travel the initial movement of the control rod, called dead travel, over a few mm does not increase the pressure. Braking is therefore delayed by the dead stroke.
  • a master cylinder in particular a valve master cylinder, preferably a tandem master cylinder with fast, reliable and robust reaction. It is also an object of the present invention to offer such a master cylinder having a small dead travel.
  • a master cylinder advantageously a tandem master cylinder according to the present invention comprising at least one piston mounted in translation in a cylinder provided with a valve comprising a stroke adjustment piece so as to obtain a desired dead stroke. , preferably a dead travel belonging to a range of desired dead travel values.
  • a method according to the invention for manufacturing such a master cylinder comprises a step of measuring the dead stroke of the valve followed by a step of mounting in the master cylinder a stroke adjustment piece ensuring stroke compensation so as to obtain a dead travel belonging to a range of desired dead travel values.
  • a single measurement is made and a choice of single adjustment pieces valid for a batch of master cylinders to be manufactured.
  • the invention mainly relates to a method of manufacturing a master cylinder with valve comprising the steps of assembling a master cylinder comprising a movable piston in a chamber equipped with a valve so that the advancement of the piston in the chamber initially corresponds to a dead stroke, valve open, followed by a useful stroke with reduction of the internal volume of the chamber, valve closed characterized in that it further comprises the steps consisting in: a) measuring the stroke dead; b) determine from the measurement of the dead travel, the geometry of an adjustment piece ensuring the opening control of the valve during the advancement of the piston adapted to obtain a desired dead travel; and c) mounting in the master cylinder the valve opening control adjustment part so as to modify, in particular to reduce, the dead stroke of the master cylinder.
  • the invention also relates to a method characterized in that the adjustment part, to be fitted is chosen from a set of similar parts comprising a plurality of geometries, each corresponding, for a given master cylinder, to a different dead travel.
  • the invention also relates to a method characterized in that after step b of determining the geometry of an adjustment piece it includes a step of manufacturing said adjustment piece having the geometry determined at step b.
  • the invention also relates to a method characterized in that the manufacture of the adjustment piece comprises a step of forming said piece.
  • the invention also relates to a method characterized in that the adjustment piece is a pin for receiving the end of a rod of a valve and in that the determination of the geometry of the pin consists in determination of its diameter in the area of contact with the valve stem.
  • the invention also relates to a method characterized in that the adjustment piece is a ring comprising a bearing shoulder for the pin and in that the determination of the geometry of said ring consists in determining the thickness of the shoulder.
  • the invention also relates to a method characterized in that the master cylinder to be manufactured and of which there is just the dead stroke is a tandem master cylinder comprising a primary circuit and a secondary circuit and in that the adjustment of the dead strokes s 'performs both at the primary and secondary circuits.
  • the invention also relates to a method characterized in that said method is a method of manufacturing a batch of master cylinders and in that it comprises a single step of determining from the measurement of the geometry of a adjustment piece followed by the successive mounting on a plurality of master cylinders with valves of adjustment pieces whose geometry corresponds to that determined during said single determination.
  • the invention also relates to a master cylinder with reduced dead-stroke valves characterized in that it is manufactured by a process according to the invention.
  • the invention also relates to a master cylinder comprising a piston movable in a chamber equipped with a valve so that the advancement of the piston in the chamber corresponds firstly to a dead stroke, valve open, followed by a useful stroke with reduction of the internal volume of the chamber, valve closed, in that the valve comprises a rod, one end of which rests on a pin characterized in that it comprises a shouldered ring for adjusting the position at rest of the pin determining the dead stroke of said master cylinder.
  • FIG. 1 is a curve of the pressure generated by an example of a master cylinder according to the present invention as a function of the stroke of the pistons;
  • Figure 2 is a longitudinal sectional view of the preferred embodiment of a tandem master cylinder according to the present invention.
  • Figure 3 is a similar view, on a larger scale of a detail of the master cylinder of Figure 2;
  • Figure 4 is a longitudinal sectional view of the detail of Figure 3 seen in section along a plane perpendicular to the sectional plane of Figure 3;
  • Figure 5 is a block diagram illustrating the influence on the dead travel of the diameter of the contact area between the pin and the stem of a valve
  • Figure 6 is a sectional view of a tool capable of being used by the method according to the present invention in a first phase of the step of manufacturing an adjustment piece;
  • Figure 7 is a similar view during a second phase when the adjustment part is formed;
  • FIG. 8 is a flowchart illustrating a first alternative embodiment of an individual master cylinder adjustment method according to the present invention.
  • Figure 9 is a flow diagram of a second alternative embodiment of a method according to the present invention with individual master cylinder adjustment
  • FIG. 10 is a flowchart illustrating a first alternative embodiment of a method of batch adjustment of master cylinders according to the present invention.
  • FIG. 11 is a flow diagram of a second alternative embodiment of a method according to the present invention with adjustment by batch of master cylinders.
  • the curve 1 comprises first of all a horizontal plateau 1 1 corresponding to a pressure substantially equal to 50 Pa up to an inflection point 13 followed by a zone 15 in which the pressure 5 increases with the stroke 7
  • the abscissa of the point 13 determines the dead travel of the primary circuit which is advantageously between 0.1 mm and 3 mm, preferably between 0.5 mm and 1.8 mm, more preferably between 0.5 + 0.2 mm and 1.5 + 0.2 mm
  • the curve 3 comprises a horizontal plateau 17 corresponding for example to a pressure of the order of 100 Pa terminated by an inflection point 19 followed by a zone 21 in which the pressure 5 rises as a function of the stroke 7
  • the abscissa of the point 19 corresponds to the dead travel of the secondary circuit of the master cylinder.
  • This dead travel of the secondary circuit is for example comp ⁇ se between 0.1 mm and 2 mm advantageously between 0.5 + 0.2 mm and 1.3 + 0.2 mm.
  • the minimum, non-zero value of the dead travel allows the master cylinder to be re-fueled with brake fluid, in particular in the case of a braking system comprising electronic systems preventing the locking of the wheels (ABS in English terminology). tries to reduce the dead travel so as to avoid excessive pedal travel and an unnecessary increase in the time between when the driver presses the pedal and when the hydraulic pressure is actually applied to the brake actuators located in the wheels.
  • a tandem master cylinder 23 comprising a primary circuit 25 and a secondary circuit 27.
  • the primary circuit comprises means 29 for connection to a liquid reservoir brake (not shown) connected by a supply channel 31 to a supply chamber 33
  • the primary piston 9 comprises means 35 for coupling with a push rod (not shown), typically a cavity for receiving the end of said push rod.
  • the push rod is integral with a control rod driven by the brake pedal.
  • the displacements of the push rod are advantageously assisted by a pneumatic booster of known type.
  • a master cylinder with valves comprises a valve 37 ensuring during the advance of the piston 9 along an arrow 39 the hermetic insulation of a primary chamber 41 with respect to the supply chamber 33
  • the primary piston 9 comprises a rod 42 guided by a guide ring 43 fixed by a circhp 45 on the body of the master cylinder
  • the rod 42 carries a transverse wall 47 closing the primary chamber 41
  • the wall 47 is traversed by a bore 49 receiving a rod 51 connecting a valve head 53 to a support element 55.
  • the element 55 is a pin held by a washer or ring 57, itself held by the guide ring 43
  • the transverse pin 55 is arranged orthogonally to an axis A of the master cylinder 23 according to the present invention in a hole 56 formed in the piston primary 9 having a longitudinal extension e greater than or equal to the dead travel of the primary circuit.
  • the rear face 59 of the ring 57 has a predetermined position by the length of the guide ring 43 as well as by the location of the receiving cavity of the circhp 45
  • the bore 49 has a section greater than the rod 51 so as to provide a passage for the brake fluid, when the valve 37 is open, between the supply chamber 33 and the primary chamber 41.
  • the open position is obtained when one end 61 of the rod 51 opposite the head 53 bears on the support element 55, in particular on the pin.
  • the push rod advances the primary piston 9 according to arrow 39.
  • this advance corresponds to the dead stroke during which the valve 37 is open until contact is established between the rear face 61 of the head 53 of the valve 37 with the front face 63 of the wall 47 of the primary piston 1.
  • the closing of the valve causes the primary chamber to be hermetically isolated from the supply chamber 33 and consequently compared to the brake fluid reservoir which is not subjected to the pressure generated by the master cylinder.
  • the advance of the primary piston ensures the reduction of the volume of the primary chamber 41, and consequently the increase in the pressure of the brake fluid which fills it with application of the brake fluid under pressure, by the through an opening 65 to the brake actuators associated with the vehicle wheels.
  • the secondary piston 67 has a transverse wall 69 provided with a bore 71 crossed by a rod 73 of a valve 75 similar to the valve 37 of the primary piston 9. The end of the rod 73 opposite to that carrying the head rests on a transverse pin 77.
  • a supply channel 79 connects a brake fluid reservoir to a supply chamber 81 for the secondary cylinder situated between the primary chamber 41 and the secondary chamber 83.
  • a tapping 85 ensures during '' braking the supply of pressurized brake fluid to the secondary braking circuit.
  • the primary chamber 41 is provided with a spring 87 working in compression, a first end of which bears on the rear face of the secondary piston 67 and the opposite end of which bears on a spring stopper 89 secured to the front face of the primary piston 9.
  • the spring stopper 89 is connected to the secondary piston by the adjusting screw 69 working in traction.
  • the secondary chamber 27 is provided with a return spring 91 working in compression, a first end of which bears on the internal face of the front wall of the body of the master cylinder 23, inside the secondary chamber 83 and the opposite end is supported on the front face of the secondary piston 67.
  • the preload of the spring 87 is slightly greater than that of the spring 91.
  • the push rod (not shown) ensures the advance along arrow 39 of the primary piston 9.
  • the pin 55 is not driven along arrow 39 in the first advance phase of piston 9.
  • the primary piston 9 firstly travels the dead stroke and then the application of the air face 61 of the head 53 of the valve 37 on the front face 63 of the primary piston 9 closes the valve 37.
  • the advance of the primary piston 9 ensures low compression of the brake fluid in the chamber 41.
  • the increase in the internal pressure of the chamber 41 as well as the preload of the spring 87 ensures the advance of the secondary piston 67.
  • the pin 77 remains stationary in its drilling, the advance of the piston 67 begins by traversing the dead stroke, then, when the front face of the piston 67 forming the seat of the valve 75 comes into contact with the rear face of the head of this valve, there is an increase in pressure of the secondary circuit. From this moment there, the secondary piston 67 has a resistance to advancement allowing the reduction of the volume of the primary chamber 41 and consequently the increase of the pressure of the fluid. braking delivers by 1 opening 65 to the primary circuit Similarly, the pressurized brake fluid is delivered to the secondary circuit by the tap 85
  • the adjustment of the dead strokes of the primary circuit and / or of the secondary circuit according to the invention makes it possible to very significantly improve the performance of a master cylinder, in particular of a tandem master cylinder according to the invention, this corresponding adjustment on obtaining the desired value of the stroke which the adjusted piston must travel between a rest position and the closing of the co ⁇ espondant valve.
  • the adjustment is made by adjusting the position at rest (valve open) of the rod 51 or 71 of the valve (or any other spacer means between the valve head and the valve seat ).
  • the adjustment is made to the desired value of the point of contact between the pin 55 or 77 and the rod 51 or 71 of the valve 37 or 75. This type of adjustment can be carried out by adjusting the length.
  • valve stem and / or by adjusting the diameter or thickness of the pin at the contact with the valve stem are particularly advantageous in the case of the adjustment of the secondary circuit, insofar as the pin can be changed after the assembly of the tandem master cylinder according to the present invention.
  • the pin positioning of the pin, and in particular of the point of contact with the end of the rod, is ensured.
  • This positioning is advantageously carried out by a shouldered washer 57.
  • the front face 59 of the washer 57 is precisely positioned by the guide ring 43 itself held by the circhp 45.
  • the radially external zone 93 of the front face of the ring 57 rests on a shoulder of the body of the tandem master cylinder 23.
  • the radially internal zone 95 situated at the edge of the central opening 97 can be chosen so as to position the pin to obtain the desired adjustment.
  • FIG. 5 Such an adjustment is illustrated in FIG. 5.
  • a valve resting on a pin having a radius r co ⁇ espondant to a Dead stroke CMj.
  • the rod 51 or 77 rests in a hollowed out zone 99 of the pin whose radius r is reduced by a depth p co ⁇ espondant to a dead travel CM 2 equal to CM p.
  • the adjustment can be carried out continuously by manufacturing parts exactly adapted to the co ⁇ ections to be made to the dead travel measured so as to obtain the desired dead travel or by having a finite number of groups of parts having different ribs and by putting implement the part belonging to the group whose dimensions are closest to those necessary to obtain the desired dead stroke.
  • the parts ensuring the adjustment of the dead travel for example pins, rods or rings can be obtained by machining or, preferably, by forming.
  • FIGS. 6 and 7 an exemplary embodiment of the formation of a shouldered ring 57 can be seen. If a non-zero shoulder is desired after measurement explained below, with reference to FIGS.
  • the anvil 103 comprises a central guide core 1 15, a cylindrical recess 117 allowing the deformation of the part 95 of the shouldered ring 55 followed by a zone radially external holding 1 19
  • the method according to the invention makes it possible to obtain a desired value of dead stroke by modifying the characteristics of an exemplary master cylinder to be adjusted but, above all to minimize the dispersion of dead stroke values during mass production For example with a unit measurement illustrated in FIGS. 8 and 9, it is possible to obtain a dispersion of dead strokes, between various tandem master cylinders thus produced less than 0.4 mm (that
  • FIG. 8 one can see a process according to the present invention with unit adjustment of each master cylinder in open loop. The process begins in 121
  • the master cylinder is assembled, in particular a tandem master cylinder to be adjusted.
  • this assembly is carried out with real parts.
  • this assembly is carried out by replacing the guide ring 43 as well as the sealing elements such as cups, washers by a single piece having the same shape and serving as a measurement standard.
  • the position co ⁇ espondant to the closing of the valve is measured.
  • This measurement is advantageously carried out in pneumatics, that is to say that the master cylinder is filled with air.
  • the implementation of hydraulic measures, with, for example a brake fluid does not depart from the scope of the present invention.
  • the measurement is carried out for example between the outlet 29 of the reservoir or the inlet of the make-up channel 31 and the outlet 65.
  • the primary piston 9 is advanced according to the arrow 39 until a difference is obtained pressure between the inlet of the make-up channel 31 and the outlet 65.
  • the hydraulic dead travel is calculated from the valve closing position measured at 125
  • the difference ⁇ is calculated between the desired dead travel CM ref and the measured dead travel CM We're going to 131.
  • the standard measurement part is deposited and assembly is carried out of a functional part having the same geometry as the standard measuring part.
  • Steps 123 to 131 can also relate to a secondary valve 75 if one also wants to adjust the dead travel of the secondary circuit of a tandem master cylinder.
  • At least one of the parts ensuring the advantageously chosen fit is replaced in an assembly comprising the rod 51 of the valve 37, the pin 55 and the ring 57 by at least one part or a combination of these parts reducing the dead travel.
  • a shorter rod 51, a pin 55 whose area 99 has a smaller diameter or a ring 57 having a shoulder 95 of thinner thickness is chosen.
  • the functional parts are mounted ensuring, unlike in step 139, the increase in the dead travel, for example by mounting a rod 51 of greater length, a pin 55 having a stronger diameter at the point of contact with the rod 51 and / or a ring 57 having a shoulder 95 of greater thickness.
  • FIG. 9 an advantageous example of a master cylinder manufacturing process according to the present invention can be seen with closed-loop adjustment of the dead travel value (s).
  • the process in FIG. 9 differs from that in FIG. 8 in that after steps 139 and 141 we return to 125 to check the changes made.
  • a counter comprising, for example, an initialization step 143 prior to step 125 and, in the loop, an incrementation step 145 and a step 147 of comparison with respect to a maximum value makes it possible to avoid over-indefinitely the loop with a defective part.
  • Adjustment by manufacturing batch has many advantages. First of all, manufacturing with batch adjustment of master cylinders makes it possible to speed up operations while eliminating the individual adjustment operations of master cylinders. Furthermore, it is possible to carry out more in-depth measurements by sacrificing one or more master cylinders to perform the batch calibration. Indeed, it is possible to carry out a test with various values of the adjustment parts without it being essential to dismantle the part on which the measurement was made, the result making it possible to determine or to extrapolate the optimal values to be used on the manufacturing batch to follow
  • the measurements are carried out, advantageously pneumatic, for closing the or, advantageously valves.
  • the difference ⁇ is calculated between the desired dead travel CM ref and the measured dead travel CM.
  • the batch of master cylinders adjusted in accordance with the present invention is carried out.
  • the batch corresponds to a certain number of parts.
  • the batch will include 300, 1000 or 5000 pieces depending on the stability of the manufacturing process, and consequently, according to the drift in tolerances.
  • a batch corresponds to a given manufacturing time and not to a number of parts produced.
  • a final check, on each part, or by sampling makes it possible or not to continue the manufacture of the same batch corresponding to the same choice of dead stroke adjustment parts.
  • At least one of the parts ensuring the advantageously chosen fit is replaced in an assembly comprising the rod 51 of the valve 37, the pin 55 and the ring 57 by at least one part or a combination of these parts reducing the dead travel.
  • a shorter rod 51, a pin 55 whose area 99 has a smaller diameter or a ring 57 having a shoulder 95 of thinner thickness is chosen.
  • the functional parts are mounted ensuring, unlike in step 139, 1 increase in the dead travel, for example by mounting a rod 51 of greater length, a pin 55 having a larger diameter at point of contact with the rod 51 and / or a ring 57 having a shoulder 95 of greater thickness
  • This process differs from the process of figure 10 in that one carries out a closed loop control, that is to say that from 139 or from 141, one returns to 123 so as to ensure a new assembly of a master cylinder of calibration batch manufacturing. It can be the same master cylinder as before but equipped with new dead stroke adjustment parts or a new calibration master cylinder, until the desired tolerances are obtained (in step 131)
  • the process of Figure 1 1 further decreases the tolerances of the master cylinders manufactured.
  • the present invention is particularly applicable to the automotive industry.
  • the present invention applies mainly to the industry of braking systems for motor vehicles and in particular for passenger cars.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

The invention mainly concerns a method for making a master cylinder, in particular a tandem master cylinder comprising a step which consists in adjusting lost travel and a master cylinder obtained by said method. The inventive tandem master cylinder (13) comprises at least a piston (9, 67) mounted in translation in a cylinder equipped with a valve (37, 75) comprising a travel adjusting component (51, 71, 55, 77, 57) so as to obtain a desired lost travel, preferably lost travel within a range of desired lost travel values. The inventive method for making such a cylinder comprises a step which consists in measuring the valve lost travel followed by a step which consists in mounting in the master cylinder a travel adjusting component providing travel compensation so as to obtain lost travel within a range of desired lost travel values. The invention is particularly applicable to the motor car industry. The invention is mainly applicable to the industry manufacturing brake systems for motor vehicles and in particular passenger vehicles.

Description

PROCEDE DE FABRICATION D'UN MAÎTRE CYLINDRE ET MAÎTRE CYLINDRE OBTENU PAR LEDIT PROCEDE. METHOD FOR MANUFACTURING A MASTER CYLINDER AND MASTER CYLINDER OBTAINED BY SAID METHOD.
La présente invention se rapporte principalement à un procédé de fabrication d'un maître cylindre, notamment d'un maître cylindre tandem comportant une étape d'ajustage de course morte et à un maître cylindre obtenu par ledit procédé.The present invention relates mainly to a method for manufacturing a master cylinder, in particular a tandem master cylinder comprising a step for adjusting the dead travel and to a master cylinder obtained by said method.
Il est habituel de mettre en œuvre dans les systèmes de freinage des maîtres cylindres tandem à clapets délivrant, sur commande, un liquide de frein sous haute pression susceptible d'actionner les freins associés aux roues d'un véhicule automobile.It is usual to use tandem valve master cylinders in braking systems delivering, on command, a high pressure brake fluid capable of actuating the brakes associated with the wheels of a motor vehicle.
Le déplacement d'une tige de commande par une pédale de frein, avantageusement assistée par un servomoteur pneumatique, entraîne une tige de poussée qui à son tour déplace au moins un piston du maître cylindre tandem et réduit le volume interne d'au moins une chambre remplie avec un liquide de frein dont la pression se trouve augmentée.The displacement of a control rod by a brake pedal, advantageously assisted by a pneumatic servomotor, causes a push rod which in turn displaces at least one piston of the tandem master cylinder and reduces the internal volume of at least one chamber filled with brake fluid, the pressure of which is increased.
Toutefois, le déplacement initial de la tige de commande, appelé course morte, sur quelques mm n'entraîne aucune augmentation de pression. Le freinage est donc retardé par la course morte.However, the initial movement of the control rod, called dead travel, over a few mm does not increase the pressure. Braking is therefore delayed by the dead stroke.
C'est par conséquent un but de la présente invention d'offrir un maître cylindre, notamment un maître cylindre à clapet, de préférence un maître cylindre tandem à réaction rapide, fiable et robuste. C'est aussi un but de la présente invention d'offrir un tel maître cylindre présentant une faible course morte.It is therefore an object of the present invention to offer a master cylinder, in particular a valve master cylinder, preferably a tandem master cylinder with fast, reliable and robust reaction. It is also an object of the present invention to offer such a master cylinder having a small dead travel.
C'est également un but de la présente invention d'offrir des lots de maîtres cylindres présentant une très faible dispersion de course morte.It is also an object of the present invention to offer batches of master cylinders having a very low dead travel dispersion.
C'est également un but de la présente invention d'offrir un tel maître cylindre présentant peu de différence ou de modification par rapport au maître cylindre de type connu de manière à en faciliter le développement. C'est aussi un but de la présente invention d'offrir un maître cylindre tandem ayant un prix de revient modéré.It is also an object of the present invention to offer such a master cylinder having little difference or modification compared to the master cylinder of known type so as to facilitate its development. It is also an object of the present invention to offer a tandem master cylinder having a moderate cost price.
Ces buts sont atteints par un maître cylindre, avantageusement un maître cylindre tandem selon la présente invention comportant au moins un piston monté à translation dans un cylindre muni d'un clapet comportant une pièce d'ajustement de course de manière à obtenir une course morte désirée, de préférence une course morte appartenant à un intervalle de valeurs de course morte désirée.These aims are achieved by a master cylinder, advantageously a tandem master cylinder according to the present invention comprising at least one piston mounted in translation in a cylinder provided with a valve comprising a stroke adjustment piece so as to obtain a desired dead stroke. , preferably a dead travel belonging to a range of desired dead travel values.
Un procédé selon l'invention de fabrication d'un tel maître cylindre comporte une étape de mesure de la course morte du clapet suivie par une étape de montage dans le maître cylindre d'une pièce d'ajustement de la course assurant une compensation de course de manière à obtenir une course morte appartenant à un intervalle de valeurs de course morte désirée. Avantageusement, on effectue une mesure unique et un choix de pièces d'ajustement unique valables pour un lot de maîtres cylindres à fabriquer. L'invention a principalement pour objet un procédé de fabrication d'un maître cylindre à clapet comportant les étapes consistant à assembler un maître cylindre comportant un piston mobile dans une chambre équipé d'un clapet de manière à ce que l'avancement du piston dans la chambre correspond en un premier temps à une course morte, clapet ouvert, suivi par une course utile avec diminution du volume interne de la chambre, clapet fermé caractérisé en ce qu'il comporte en outre les étapes consistant à : a) Mesurer la course morte ; b) déterminer à partir de la mesure de la course morte, la géométrie d'une pièce d'ajustement assurant la commande d'ouverture du clapet lors de l'avancement du piston adaptée pour obtenir une course morte désirée ; et c) monter dans le maître cylindre la pièce d'ajustement de commande d'ouverture du clapet de manière à modifier, notamment à réduire, la course morte du maître cylindre.A method according to the invention for manufacturing such a master cylinder comprises a step of measuring the dead stroke of the valve followed by a step of mounting in the master cylinder a stroke adjustment piece ensuring stroke compensation so as to obtain a dead travel belonging to a range of desired dead travel values. Advantageously, a single measurement is made and a choice of single adjustment pieces valid for a batch of master cylinders to be manufactured. The invention mainly relates to a method of manufacturing a master cylinder with valve comprising the steps of assembling a master cylinder comprising a movable piston in a chamber equipped with a valve so that the advancement of the piston in the chamber initially corresponds to a dead stroke, valve open, followed by a useful stroke with reduction of the internal volume of the chamber, valve closed characterized in that it further comprises the steps consisting in: a) measuring the stroke dead; b) determine from the measurement of the dead travel, the geometry of an adjustment piece ensuring the opening control of the valve during the advancement of the piston adapted to obtain a desired dead travel; and c) mounting in the master cylinder the valve opening control adjustment part so as to modify, in particular to reduce, the dead stroke of the master cylinder.
L'invention a également pour objet un procédé caractérisé en ce que la pièce d'ajustement, à monter est choisie dans un ensemble de pièces analogues comportant une pluralité de géométries, chacune correspondant, pour un maître cylindre donné, à une course morte différente.The invention also relates to a method characterized in that the adjustment part, to be fitted is chosen from a set of similar parts comprising a plurality of geometries, each corresponding, for a given master cylinder, to a different dead travel.
L'invention a également pour objet un procédé caractérisé en ce que postérieurement à l'étape b de détermination de la géométrie d'une pièce d'ajustement il comporte une étape de fabrication de ladite pièce d'ajustement ayant la géométrie déterminée à l'étape b.The invention also relates to a method characterized in that after step b of determining the geometry of an adjustment piece it includes a step of manufacturing said adjustment piece having the geometry determined at step b.
L'invention a également pour objet un procédé caractérisé en ce que la fabrication de la pièce d'ajustement comporte une étape de formage de ladite pièce. L'invention a également pour objet un procédé caractérisé en ce que la pièce d'ajustement est une goupille de réception de l'extrémité d'une tige d'un clapet et en ce que la détermination de la géométrie de la goupille consiste en la détermination de son diamètre dans la zone de contact avec la tige du clapet. L'invention a également pour objet un procédé caractérisé en ce que la pièce d'ajustement est une bague comportant un épaulement d'appui de la goupille et en ce que la détermination de la géométrie de ladite bague consiste en la détermination de l'épaisseur de F épaulement. L'invention a également pour objet un procédé caractérisé en ce que le maître cylindre à fabriquer et dont on a juste la course morte est un maître cylindre tandem comportant un circuit primaire et un circuit secondaire et en ce que l'ajustement des courses mortes s'effectue aussi bien au niveau du circuit primaire que du circuit secondaire. L'invention a également pour objet un procédé caractérisé en ce que ledit procédé est un procédé de fabrication d'un lot de maîtres cylindres et en ce qu'il comporte une étape unique de détermination à partir de la mesure de la géométrie d'une pièce d'ajustement suivi par le montage successif sur une pluralité de maîtres cylindres à clapets de pièces d'ajustement dont la géométrie correspond à celle déterminée lors de ladite unique détermination. L'invention a également pour objet un maître cylindre à clapets à course morte réduite caractérisé en qu'il est fabriqué par un procédé selon l'invention.The invention also relates to a method characterized in that the manufacture of the adjustment piece comprises a step of forming said piece. The invention also relates to a method characterized in that the adjustment piece is a pin for receiving the end of a rod of a valve and in that the determination of the geometry of the pin consists in determination of its diameter in the area of contact with the valve stem. The invention also relates to a method characterized in that the adjustment piece is a ring comprising a bearing shoulder for the pin and in that the determination of the geometry of said ring consists in determining the thickness of the shoulder. The invention also relates to a method characterized in that the master cylinder to be manufactured and of which there is just the dead stroke is a tandem master cylinder comprising a primary circuit and a secondary circuit and in that the adjustment of the dead strokes s 'performs both at the primary and secondary circuits. The invention also relates to a method characterized in that said method is a method of manufacturing a batch of master cylinders and in that it comprises a single step of determining from the measurement of the geometry of a adjustment piece followed by the successive mounting on a plurality of master cylinders with valves of adjustment pieces whose geometry corresponds to that determined during said single determination. The invention also relates to a master cylinder with reduced dead-stroke valves characterized in that it is manufactured by a process according to the invention.
L'invention a également pour objet un maître cylindre comportant un piston mobile dans une chambre équipé d'un clapet de manière à ce que l'avancement du piston dans la chambre corresponde en un premier temps à une course morte, clapet ouvert, suivi par une course utile avec diminution du volume interne de la chambre, clapet fermé, en ce que le clapet comporte une tige dont une extrémité repose sur une goupille caractérisé en ce qu'il comporte une bague épaulée de réglage de la position au repos de la goupille déterminant la course morte dudit maître cylindre.The invention also relates to a master cylinder comprising a piston movable in a chamber equipped with a valve so that the advancement of the piston in the chamber corresponds firstly to a dead stroke, valve open, followed by a useful stroke with reduction of the internal volume of the chamber, valve closed, in that the valve comprises a rod, one end of which rests on a pin characterized in that it comprises a shouldered ring for adjusting the position at rest of the pin determining the dead stroke of said master cylinder.
L'invention sera mieux comprise au moyen de la description ci-après et des figures annexées données comme des exemples non limitatifs et sur lesquelles :The invention will be better understood by means of the description below and the appended figures given as nonlimiting examples and in which:
La figure 1 est une courbe de la pression générée par un exemple de maître cylindre selon la présente invention en fonction de la course des pistons ;FIG. 1 is a curve of the pressure generated by an example of a master cylinder according to the present invention as a function of the stroke of the pistons;
La figure 2 est une vue en coupe longitudinale de l'exemple préféré de réalisation d'un maître cylindre tandem selon la présente invention ;Figure 2 is a longitudinal sectional view of the preferred embodiment of a tandem master cylinder according to the present invention;
La figure 3 est une vue analogue, à plus grande échelle d'un détail du maître cylindre de la figure 2 ; La figure 4 est une vue en coupe longitudinale du détail de la figure 3 vu en coupe selon un plan perpendiculaire au plan de coupe de la figure 3 ;Figure 3 is a similar view, on a larger scale of a detail of the master cylinder of Figure 2; Figure 4 is a longitudinal sectional view of the detail of Figure 3 seen in section along a plane perpendicular to the sectional plane of Figure 3;
La figure 5 est un schéma de principe illustrant l'influence sur la course morte du diamètre de la zone de contact entre la goupille et la tige d'un clapet ;Figure 5 is a block diagram illustrating the influence on the dead travel of the diameter of the contact area between the pin and the stem of a valve;
La figure 6 est une vue en coupe d'un outil susceptible d'être utilisé par le procédé selon la présente invention dans une première phase de l'étape de fabrication d'une pièce d'ajustement ; La figure 7 est une vue analogue lors d'une deuxième phase lorsque la pièce d'ajustement est formée ;Figure 6 is a sectional view of a tool capable of being used by the method according to the present invention in a first phase of the step of manufacturing an adjustment piece; Figure 7 is a similar view during a second phase when the adjustment part is formed;
La figure 8 est un organigramme illustrant une première variante de réalisation d'un procédé d'ajustement individuel de maître cylindre selon la présente invention ;FIG. 8 is a flowchart illustrating a first alternative embodiment of an individual master cylinder adjustment method according to the present invention;
La figure 9 est un organigramme d'une deuxième variante de réalisation d'un procédé selon la présente invention avec ajustement individuel de maître cylindre ;Figure 9 is a flow diagram of a second alternative embodiment of a method according to the present invention with individual master cylinder adjustment;
La figure 10 est un organigramme illustrant une première variante de réalisation d'un procédé d'ajustement par lot de maîtres cylindres selon la présente invention ;FIG. 10 is a flowchart illustrating a first alternative embodiment of a method of batch adjustment of master cylinders according to the present invention;
La figure 11 est un organigramme d'une deuxième variante de réalisation d'un procédé selon la présente invention avec ajustement par lot de maîtres cylindres.FIG. 11 is a flow diagram of a second alternative embodiment of a method according to the present invention with adjustment by batch of master cylinders.
Sur les figures 1 à 1 1 , on a utilisé les même références pour désigner les même éléments. Sur la figure 1 on peut voir une première courbe 1 et une seconde courbe 3 représentant la pression 5 générée par un circuit primaire, respectivement secondaire, en fonction de la course 7 d'une tige de poussée entraînant un piston primaire 9 (figure 2)In Figures 1 to 1 1, we used the same references to designate the same elements. In Figure 1 we can see a first curve 1 and a second curve 3 representing the pressure 5 generated by a primary circuit, respectively secondary, as a function of the stroke 7 of a push rod driving a primary piston 9 (Figure 2)
La courbe 1 comporte tout d'abord un palier horizontal 1 1 correspondant à une pression sensiblement égale à 50 Pa jusqu'à un point d'inflexion 13 suivi par une zone 15 dans laquelle la pression 5 augmente avec la course 7 L'abscisse du point 13 détermine la course morte du circuit primaire qui est avantageusement comprise entre 0,1 mm et 3 mm, de préférence compπse entre 0,5 mm et 1,8 mm, de manière encore préférée comprise entre 0,5 + 0,2 mm et 1,5 + 0,2 mmThe curve 1 comprises first of all a horizontal plateau 1 1 corresponding to a pressure substantially equal to 50 Pa up to an inflection point 13 followed by a zone 15 in which the pressure 5 increases with the stroke 7 The abscissa of the point 13 determines the dead travel of the primary circuit which is advantageously between 0.1 mm and 3 mm, preferably between 0.5 mm and 1.8 mm, more preferably between 0.5 + 0.2 mm and 1.5 + 0.2 mm
La courbe 3 comporte un palier horizontale 17 correspondant par exemple à une pression de l'ordre de 100 Pa terminé par un point d'inflexion 19 suivi par une zone 21 dans laquelle la pression 5 monte en fonction de la course 7 L'abscisse du point 19 coπespond à la course morte du circuit secondaire du maître cylindre. Cette course morte du circuit secondaire est par exemple compπse entre 0, 1 mm et 2 mm avantageusement entre 0,5 + 0,2 mm et 1,3 + 0,2 mm. La valeur minimale, non nulle de la course morte permet la réahmentation de chambre du maître cylindre en liquide de frein notamment dans le cas de système de freinage comportant des systèmes électroniques évitant le blocage des roues (ABS en terminologie anglo saxonne) Par ailleurs, on essaie de réduire la course morte de manière à éviter une course sur la pédale trop importante et une augmentation inutile du délai entre le moment où le conducteur appuie sur la pédale et le moment où la pression hydraulique est effectivement appliquée aux actionneurs de freins disposés dans les roues.The curve 3 comprises a horizontal plateau 17 corresponding for example to a pressure of the order of 100 Pa terminated by an inflection point 19 followed by a zone 21 in which the pressure 5 rises as a function of the stroke 7 The abscissa of the point 19 corresponds to the dead travel of the secondary circuit of the master cylinder. This dead travel of the secondary circuit is for example compπse between 0.1 mm and 2 mm advantageously between 0.5 + 0.2 mm and 1.3 + 0.2 mm. The minimum, non-zero value of the dead travel allows the master cylinder to be re-fueled with brake fluid, in particular in the case of a braking system comprising electronic systems preventing the locking of the wheels (ABS in English terminology). tries to reduce the dead travel so as to avoid excessive pedal travel and an unnecessary increase in the time between when the driver presses the pedal and when the hydraulic pressure is actually applied to the brake actuators located in the wheels.
Sur la figure 2, on peut voir l'exemple préféré de réalisation d'un maître cylindre tandem 23 selon la présente invention comportant un circuit primaire 25 et un circuit secondaire 27. Le circuit primaire comporte des moyens 29 de connexion à un réservoir de liquide de frein (non représenté) relié par un canal d'alimentation 31 à une chambre d'alimentation 33 Le piston primaire 9 comporte des moyens 35 d'accouplement avec une tige de poussée (non représentée), typiquement une cavité de réception de l'extrémité de ladite tige de poussée. De manière connue, la tige de poussée est solidaire d'une tige de commande entraînée par la pédale de freins. Les déplacements de la tige de poussée sont avantageusement assistés par un servomoteur pneumatique d'assistance de type connu. Un maître cylindre à clapets comporte un clapet 37 assurant lors de l'avance du piston 9 selon une flèche 39 l'isolation hermétique d'une chambre primaire 41 par rapport à la chambre d'alimentation 33In Figure 2, we can see the preferred embodiment of a tandem master cylinder 23 according to the present invention comprising a primary circuit 25 and a secondary circuit 27. The primary circuit comprises means 29 for connection to a liquid reservoir brake (not shown) connected by a supply channel 31 to a supply chamber 33 The primary piston 9 comprises means 35 for coupling with a push rod (not shown), typically a cavity for receiving the end of said push rod. In known manner, the push rod is integral with a control rod driven by the brake pedal. The displacements of the push rod are advantageously assisted by a pneumatic booster of known type. A master cylinder with valves comprises a valve 37 ensuring during the advance of the piston 9 along an arrow 39 the hermetic insulation of a primary chamber 41 with respect to the supply chamber 33
Dans l'exemple préféré de réalisation illustré, le piston pπmaire 9 comporte une tige 42 guidée par une bague de guidage 43 fixée par un circhp 45 sur le corps du maître cylindreIn the preferred embodiment illustrated, the primary piston 9 comprises a rod 42 guided by a guide ring 43 fixed by a circhp 45 on the body of the master cylinder
23 La tige 42 porte une paroi transversale 47 fermant la chambre primaire 41 La paroi 47 est traversée par un alésage 49 recevant une tige 51 reliant une tête de clapet 53 à un élément d'appui 55. Dans l'exemple préféré illustré, l'élément 55 est une goupille maintenue par une rondelle ou bague 57, elle-même maintenue par la bague de guidage 43 La goupille transversale 55 est disposée orthogonalement à un axe A du maître cylindre 23 selon la présente invention dans une lumière 56 pratiquée dans le piston primaire 9 ayant une extension longitudinale e supéπeure ou égale à la course morte du circuit primaire. D est à noter que la face arrière 59 de la bague 57 a une position prédéterminée par la longueur de la bague de guidage 43 ainsi que par l'emplacement de la cavité de réception du circhp 45 L'alésage 49 a une section supérieure à la tige 51 de manière à ménager un passage du liquide de frein, lorsque le clapet 37 est ouvert, entre la chambre d'alimentation 33 et la chambre primaire 41. La position ouverte est obtenue lorsqu'une extrémité 61 de la tige 51 opposée à la tête 53 prend appui sur l'élément d'appui 55, notamment sur la goupille.23 The rod 42 carries a transverse wall 47 closing the primary chamber 41 The wall 47 is traversed by a bore 49 receiving a rod 51 connecting a valve head 53 to a support element 55. In the preferred example illustrated, the element 55 is a pin held by a washer or ring 57, itself held by the guide ring 43 The transverse pin 55 is arranged orthogonally to an axis A of the master cylinder 23 according to the present invention in a hole 56 formed in the piston primary 9 having a longitudinal extension e greater than or equal to the dead travel of the primary circuit. D it should be noted that the rear face 59 of the ring 57 has a predetermined position by the length of the guide ring 43 as well as by the location of the receiving cavity of the circhp 45 The bore 49 has a section greater than the rod 51 so as to provide a passage for the brake fluid, when the valve 37 is open, between the supply chamber 33 and the primary chamber 41. The open position is obtained when one end 61 of the rod 51 opposite the head 53 bears on the support element 55, in particular on the pin.
Lors d'un freinage, la tige de poussée fait avancer le piston primaire 9 selon la flèche 39. Dans un premier temps, cette avancée correspond à la course morte pendant laquelle le clapet 37 est ouvert jusqu'à l'établissement de contact entre la face arrière 61 de la tête 53 du clapet 37 avec la face avant 63 de la paroi 47 du piston primaire 1. La fermeture du clapet provoque l'isolement hermétique de la chambre primaire 41 par rapport à la chambre d'alimentation 33 et par suite par rapport au réservoir de liquide de freinage qui n'est pas soumis à la pression générée par le maître cylindre. Dans un deuxième temps, l'avancée du piston primaire assure la diminution du volume de la chambre primaire 41, et par suite l'augmentation de la pression du liquide de frein qui la remplit avec application du liquide de frein sous pression, par l'intermédiaire d'une ouverture 65 aux actionneurs de freins associés aux roues du véhicule.During braking, the push rod advances the primary piston 9 according to arrow 39. Firstly, this advance corresponds to the dead stroke during which the valve 37 is open until contact is established between the rear face 61 of the head 53 of the valve 37 with the front face 63 of the wall 47 of the primary piston 1. The closing of the valve causes the primary chamber to be hermetically isolated from the supply chamber 33 and consequently compared to the brake fluid reservoir which is not subjected to the pressure generated by the master cylinder. In a second step, the advance of the primary piston ensures the reduction of the volume of the primary chamber 41, and consequently the increase in the pressure of the brake fluid which fills it with application of the brake fluid under pressure, by the through an opening 65 to the brake actuators associated with the vehicle wheels.
De manière analogue, le piston secondaire 67 comporte une paroi transversale 69 munie d'un alésage 71 traversé par une tige 73 d'un clapet 75 analogue au clapet 37 du piston primaire 9. L'extrémité de la tige 73 opposée à celle portant la tête prend appui sur une goupille transversale 77. Un canal d'alimentation 79 relie un réservoir de liquide de frein à une chambre 81 d'alimentation du cylindre secondaire situé entre la chambre primaire 41 et la chambre secondaire 83. Un piquage 85 assure lors d'un freinage l'alimentation en liquide de frein sous pression du circuit secondaire de freinage.Similarly, the secondary piston 67 has a transverse wall 69 provided with a bore 71 crossed by a rod 73 of a valve 75 similar to the valve 37 of the primary piston 9. The end of the rod 73 opposite to that carrying the head rests on a transverse pin 77. A supply channel 79 connects a brake fluid reservoir to a supply chamber 81 for the secondary cylinder situated between the primary chamber 41 and the secondary chamber 83. A tapping 85 ensures during '' braking the supply of pressurized brake fluid to the secondary braking circuit.
La chambre primaire 41 est munie d'un ressort 87 travaillant en compression dont une première extrémité prend appui sur la face arrière du piston secondaire 67 et dont l'extrémité opposée prend appui sur une butée de ressort 89 solidarisée avec la face avant du piston primaire 9. La butée de ressort 89 est reliée au piston secondaire par la vis de réglage 69 travaillant en traction. La chambre secondaire 27 est munie d'un ressort de rappel 91 travaillant en compression dont une première extrémité prend appui sur la face interne de la paroi avant du corps du maître cylindre 23, à l'intérieur de la chambre secondaire 83 et dont l'extrémité opposée prend appui sur la face avant du piston secondaire 67. La précontrainte du ressort 87 est légèrement supérieure à celle du ressort 91.The primary chamber 41 is provided with a spring 87 working in compression, a first end of which bears on the rear face of the secondary piston 67 and the opposite end of which bears on a spring stopper 89 secured to the front face of the primary piston 9. The spring stopper 89 is connected to the secondary piston by the adjusting screw 69 working in traction. The secondary chamber 27 is provided with a return spring 91 working in compression, a first end of which bears on the internal face of the front wall of the body of the master cylinder 23, inside the secondary chamber 83 and the opposite end is supported on the front face of the secondary piston 67. The preload of the spring 87 is slightly greater than that of the spring 91.
Lors d'un freinage, la tige de poussée (non représentée) assure l'avance selon la flèche 39 du piston primaire 9. La goupille 55 n'est pas entraînée selon la flèche 39 dans la première phase d'avance du piston 9. Le piston primaire 9 parcourt tout d'abord la course morte puis l'application de la face aπière 61 de la tête 53 du clapet 37 sur la face avant 63 du piston primaire 9 assure la fermeture du clapet 37. L'avance du piston primaire 9 assure une faible compression du liquide de frein de la chambre 41. L'augmentation de la pression interne de la chambre 41 ainsi que la précontrainte du ressort 87 assurent l'avance du piston secondaire 67. La goupille 77 restant stationnaire dans son perçage, l'avance du piston 67 commence par parcourir la course morte, puis, lorsque la face avant du piston 67 formant siège du clapet 75 entre en contact avec la face arrière de la tête de ce clapet, on assiste à l'augmentation de la pression du circuit secondaire. A partir de ce moment là, le piston secondaire 67 présente une résistance à l'avancement permettant la réduction du volume de la chambre primaire 41 et par suite l'augmentation de la pression du fluide de freinage délivre par 1 ouverture 65 au circuit primaire De même, le liquide de frein sous pression est délivre au circuit secondaire par le piquage 85During braking, the push rod (not shown) ensures the advance along arrow 39 of the primary piston 9. The pin 55 is not driven along arrow 39 in the first advance phase of piston 9. The primary piston 9 firstly travels the dead stroke and then the application of the air face 61 of the head 53 of the valve 37 on the front face 63 of the primary piston 9 closes the valve 37. The advance of the primary piston 9 ensures low compression of the brake fluid in the chamber 41. The increase in the internal pressure of the chamber 41 as well as the preload of the spring 87 ensures the advance of the secondary piston 67. The pin 77 remains stationary in its drilling, the advance of the piston 67 begins by traversing the dead stroke, then, when the front face of the piston 67 forming the seat of the valve 75 comes into contact with the rear face of the head of this valve, there is an increase in pressure of the secondary circuit. From this moment there, the secondary piston 67 has a resistance to advancement allowing the reduction of the volume of the primary chamber 41 and consequently the increase of the pressure of the fluid. braking delivers by 1 opening 65 to the primary circuit Similarly, the pressurized brake fluid is delivered to the secondary circuit by the tap 85
L'ajustement des courses mortes du circuit primaire et/ou du circuit secondaire selon l'invention permet d'améliorer de façon très sensible les performances d'un maître cylindre, notamment d'un maître cylindre tandem selon l'invention, cet ajustement correspondant à l'obtention de la valeur désirée de la course que doit parcourir le piston ajusté entre une position de repos et la fermeture du clapet coπespondant. Dans un premier exemple de réalisation, l'ajustement s'effectue par un réglage de la position au repos (clapet ouvert) de la tige 51 ou 71 du clapet (ou de tout autre moyen espaceur entre la tête du clapet et le siège du clapet). Dans l'exemple illustré, on effectue l'ajustement à la valeur désirée du point de contact entre la goupille 55 ou 77 et la tige 51 ou 71 du clapet 37 ou 75 Ce type d'ajustement peut être effectué par le réglage de la longueur de la tige de clapet et/ou par le réglage du diamètre ou de l'épaisseur de la goupille au niveau du contact avec la tige de clapet. Le réglage du diamètre de la goupille est particulièrement avantageux dans le cas du réglage du circuit secondaire, dans la mesure où la goupille peut être changée après l'assemblage du maître cylindre tandem selon la présente invention.The adjustment of the dead strokes of the primary circuit and / or of the secondary circuit according to the invention makes it possible to very significantly improve the performance of a master cylinder, in particular of a tandem master cylinder according to the invention, this corresponding adjustment on obtaining the desired value of the stroke which the adjusted piston must travel between a rest position and the closing of the coπespondant valve. In a first embodiment, the adjustment is made by adjusting the position at rest (valve open) of the rod 51 or 71 of the valve (or any other spacer means between the valve head and the valve seat ). In the example illustrated, the adjustment is made to the desired value of the point of contact between the pin 55 or 77 and the rod 51 or 71 of the valve 37 or 75. This type of adjustment can be carried out by adjusting the length. valve stem and / or by adjusting the diameter or thickness of the pin at the contact with the valve stem. The adjustment of the diameter of the pin is particularly advantageous in the case of the adjustment of the secondary circuit, insofar as the pin can be changed after the assembly of the tandem master cylinder according to the present invention.
Dans la deuxième variante de réalisation, particulièrement bien adaptée à l'ajustement de la course morte du clapet du piston primaire, on assure un positionnement de la goupille, et notamment du point de contact avec l'extrémité de la tige, désirée. Ce positionnement est avantageusement effectué par une rondelle épaulée 57. En effet, la face aπière 59 de la rondelle 57 est positionnée avec précision par la bague de guidage 43 elle-même maintenue par le circhp 45. La zone 93 radialement externe de la face avant de la bague 57 repose sur un épaulement du corps du maître cylindre tandem 23. Par contre, la zone radialement interne 95 située en bordure de l'ouverture centrale 97 peut être choisie de manière à positionner la goupille pour obtenir l'ajustage désirée.In the second variant, particularly well suited to adjusting the dead stroke of the valve of the primary piston, positioning of the pin, and in particular of the point of contact with the end of the rod, is ensured. This positioning is advantageously carried out by a shouldered washer 57. In fact, the front face 59 of the washer 57 is precisely positioned by the guide ring 43 itself held by the circhp 45. The radially external zone 93 of the front face of the ring 57 rests on a shoulder of the body of the tandem master cylinder 23. On the other hand, the radially internal zone 95 situated at the edge of the central opening 97 can be chosen so as to position the pin to obtain the desired adjustment.
Un tel réglage est illustré sur la figure 5 Dans la partie supérieure de cette figure, on a illustré un clapet reposant sur une goupille ayant un rayon r coπespondant à une course Morte CMj. Dans la partie mféπeure de la figure 5, la tige 51 ou 77 repose dans une zone 99 creusée de la goupille dont le rayon r est réduit d'une profondeur p coπespondant à une course morte CM2 égale à CM p. Ainsi, sans changer la position de l'axe 101 de la goupille, avec un minimum de modification du maître cylindre, on aπive à effectuer un ajustement de la valeur de la course morte à une valeur désirée à une tolérance près. L'ajustement peut être effectué en continu en fabπquant des pièces exactement adaptées aux coπections à apporter à la course morte mesurée de manière à obtenir la course morte désirée ou en disposant d'un nombre fini de groupes de pièces ayant des côtes différentes et en mettant en œuvre la pièce appartenant au groupe dont les dimensions sont les plus proches de celles nécessaires à l'obtention de la course morte désirée. Les pièces assurant l'ajustement de la course morte, par exemple les goupilles, les tiges ou les bagues peuvent être obtenues par usinage ou, de préférence, par formage. Sur les figures 6 et 7, on peut voir un exemple de réalisation du formage de bague épaulée 57. Si un épaulement non nul est désiré après mesure expliquée ci-après, en référence aux figures 8 à 11, on place une ébauche 55' sur une enclume 103 d'un outil de formage 105 Dans l'exemple avantageux illustré, l'enclume 103 comporte un noyau central de guidage 1 15, une creusure cylindrique 117 permettant la déformation de la partie 95 de la bague épaulée 55 suivie par une zone de maintien radialement externe 1 19 L'ébauche 55' est saisie par une mâchoire 107 radialement externe disposée en vis α vis de l'enclume 103, puis on fait descendre selon la flèche 109 un outil radialement interne 11 1 présentant une zone de contact 1 13 avec la partie a déformer de l'ébauche 55' en forme de couronne Le procédé selon l'invention permet d'obtenir une valeur désirée de course morte en modifiant les caractéristiques d'un exemplaire de maître cylindre a ajuster mais, surtout de minimiser la dispersion de valeurs de course morte lors de fabrication en série Par exemple avec une mesure unitaire illustrée sur les figures 8 et 9, on peut obtenir une dispersion de courses mortes, entre divers maîtres cylindres tandem ainsi fabriqués inférieurs à 0,4 mm (c'est à dιrej;0,2 mm) Cette_valeur peut encore être réduite avec une fabrication particulièrement soignée en petites séπes.Such an adjustment is illustrated in FIG. 5. In the upper part of this figure, there is illustrated a valve resting on a pin having a radius r coπespondant to a Dead stroke CMj. In the mféπeure part of FIG. 5, the rod 51 or 77 rests in a hollowed out zone 99 of the pin whose radius r is reduced by a depth p coπespondant to a dead travel CM 2 equal to CM p. Thus, without changing the position of the pin 101 of the pin, with a minimum modification of the master cylinder, we have to effect an adjustment of the value of the dead travel to a desired value to within tolerance. The adjustment can be carried out continuously by manufacturing parts exactly adapted to the coπections to be made to the dead travel measured so as to obtain the desired dead travel or by having a finite number of groups of parts having different ribs and by putting implement the part belonging to the group whose dimensions are closest to those necessary to obtain the desired dead stroke. The parts ensuring the adjustment of the dead travel, for example pins, rods or rings can be obtained by machining or, preferably, by forming. In FIGS. 6 and 7, an exemplary embodiment of the formation of a shouldered ring 57 can be seen. If a non-zero shoulder is desired after measurement explained below, with reference to FIGS. 8 to 11, a blank 55 'is placed on an anvil 103 of a forming tool 105 In the advantageous example illustrated, the anvil 103 comprises a central guide core 1 15, a cylindrical recess 117 allowing the deformation of the part 95 of the shouldered ring 55 followed by a zone radially external holding 1 19 The blank 55 'is gripped by a jaw 107 radially external arranged in screw α vis of the anvil 103, then one descends according to arrow 109 a radially internal tool 11 1 having a contact area 1 13 with the part to be deformed from the blank 55 'in the shape of a crown The method according to the invention makes it possible to obtain a desired value of dead stroke by modifying the characteristics of an exemplary master cylinder to be adjusted but, above all to minimize the dispersion of dead stroke values during mass production For example with a unit measurement illustrated in FIGS. 8 and 9, it is possible to obtain a dispersion of dead strokes, between various tandem master cylinders thus produced less than 0.4 mm (that is to say; 0.2 mm) Cette_value can be further reduced with particularly careful manufacturing in small pieces.
Avec un étalonnage initial suivi par la fabπcation d'un lot de maîtres cylindres tandem tels qu'illustrés sur les figures 10 et 11, on peut obtenir une dispersion de courses mortes inférieures 0,6 mm (c'est à dire + 0,3 mm).With an initial calibration followed by the fabrication of a batch of tandem master cylinders as illustrated in Figures 10 and 11, it is possible to obtain a dispersion of dead strokes of less than 0.6 mm (i.e. + 0.3 mm).
Sur la figure 8, on peut voir un processus selon la présente invention avec ajustement unitaire de chaque maître cylindre en boucle ouverte. Le processus débute en 121In FIG. 8, one can see a process according to the present invention with unit adjustment of each master cylinder in open loop. The process begins in 121
On va en 123.We're going to 123.
En 123, on effectue l'assemblage du maître cylindre, notamment d'un maître cylindre tandem à ajuster. Dans une première vaπante du procédé selon la présente invention, cet assemblage est effectué avec des pièces réelles. Avantageusement, cet assemblage est effectué en remplaçant la bague de guidage 43 ainsi que les éléments d'étanchéité tels que coupelles, rondelles par une pièce monobloc ayant la même forme et servant d'étalon de mesure.In 123, the master cylinder is assembled, in particular a tandem master cylinder to be adjusted. In a first variant of the method according to the present invention, this assembly is carried out with real parts. Advantageously, this assembly is carried out by replacing the guide ring 43 as well as the sealing elements such as cups, washers by a single piece having the same shape and serving as a measurement standard.
On va en 125.We are going to 125.
En 125, on effectue la mesure de la position coπespondant à la fermeture du clapet. Cette mesure s'effectue avantageusement en pneumatique, c'est à dire que le maître cylindre est rempli avec de l'air. Toutefois, la mise en œuvre de mesures hydrauliques, avec, par exemple un liquide de frein, ne sort pas du cadre de la présente invention. La mesure s'effectue par exemple entre la sortie 29 du réservoir ou l'entrée du canal de réalimentation 31 et la sortie 65. On fait par exemple avancer le piston primaire 9 selon la flèche 39 jusqu'à l'obtention d'une différence de pression entre l'entrée du canal de réalimentation 31 et la sortie 65.In 125, the position coπespondant to the closing of the valve is measured. This measurement is advantageously carried out in pneumatics, that is to say that the master cylinder is filled with air. However, the implementation of hydraulic measures, with, for example a brake fluid, does not depart from the scope of the present invention. The measurement is carried out for example between the outlet 29 of the reservoir or the inlet of the make-up channel 31 and the outlet 65. For example, the primary piston 9 is advanced according to the arrow 39 until a difference is obtained pressure between the inlet of the make-up channel 31 and the outlet 65.
On va en 127.We are going to 127.
En 127, on calcule la course morte hydraulique à partir de la position de fermeture du clapet mesurée en 125In 127, the hydraulic dead travel is calculated from the valve closing position measured at 125
On va en 129We are going to 129
En 129, on calcule la différence Δ entre la course morte désirée CMref et la course morte mesurée CM On v a en 131.In 129, the difference Δ is calculated between the desired dead travel CM ref and the measured dead travel CM We're going to 131.
En 131, on vérifie si la valeur absolue de la différence entre la course morte désirée et la course morte mesurée est inférieure à la valeur absolue de la différence maximale admissible Δmax (tolérance maximale admissible).In 131, it is checked whether the absolute value of the difference between the desired dead travel and the measured dead travel is less than the absolute value of the maximum allowable difference Δ max (maximum allowable tolerance).
Si oui, on va en 133. Si non, on va en 135.If yes, we go to 133. If not, we go to 135.
En 133, dans le cas de mesure avec une pièce étalon, on dépose la pièce étalon de mesure et on effectue le montage d'une pièce fonctionnelle ayant la même géométrie que la pièce étalon de mesure.In 133, in the case of measurement with a standard part, the standard measurement part is deposited and assembly is carried out of a functional part having the same geometry as the standard measuring part.
Les étapes 123 à 131 peuvent concerner également un clapet 75 secondaire si on veut également ajuster la course morte du circuit secondaire d'un maître cylindre tandem.Steps 123 to 131 can also relate to a secondary valve 75 if one also wants to adjust the dead travel of the secondary circuit of a tandem master cylinder.
De 133 on va en 137 où le processus de fabrication avec ajustement selon la présente invention est terminé.From 133 we go to 137 where the manufacturing process with adjustment according to the present invention is completed.
En 135, on vérifie si la valeur de la différence Δ entre la course morte désirée et la course morte mesurée est négative. Si oui, on va en 139.In 135, it is checked whether the value of the difference Δ between the desired dead travel and the measured dead travel is negative. If yes, we go to 139.
Si non, on va en 141.If not, we go to 141.
En 139, on remplace au moins une des pièces assurant l'ajustement avantageusement choisie dans un ensemble comportant la tige 51 du clapet 37, la goupille 55 et la bague 57 par au moins une pièce ou une combinaison de ces pièces diminuant la course morte. Par exemple, on choisit une tige 51 plus courte, une goupille 55 dont la zone 99 a un diamètre plus petit ou une bague 57 ayant un épaulement 95 de plus faible épaisseur. En 139, on peut éventuellement également effectuer l'ajustement de la course morte du clapet secondaire d'un maître cylindre tandem.In 139, at least one of the parts ensuring the advantageously chosen fit is replaced in an assembly comprising the rod 51 of the valve 37, the pin 55 and the ring 57 by at least one part or a combination of these parts reducing the dead travel. For example, a shorter rod 51, a pin 55 whose area 99 has a smaller diameter or a ring 57 having a shoulder 95 of thinner thickness is chosen. In 139, it is optionally also possible to adjust the dead travel of the secondary valve of a tandem master cylinder.
En 141, on effectue le montage des pièces fonctionnelles assurant, contrairement à l'étape 139, l'augmentation de la course morte, par exemple par montage d'une tige 51 de plus grande longueur, d'une goupille 55 ayant un plus fort diamètre au point de contact avec la tige 51 et/ou d'une bague 57 présentant un épaulement 95 de plus grande épaisseur.In 141, the functional parts are mounted ensuring, unlike in step 139, the increase in the dead travel, for example by mounting a rod 51 of greater length, a pin 55 having a stronger diameter at the point of contact with the rod 51 and / or a ring 57 having a shoulder 95 of greater thickness.
On peut également effectuer un éventuel ajustement de la course morte du circuit secondaire d'un maître cylindre tandem. Il est particulièrement avantageux dans le cas de l'ajustement de la course morte du circuit secondaire d'utiliser la goupille 77 comme pièce d'ajustement. En effet, cette goupille est disposée dans un perçage permettant son changement même après l'assemblage complet d'un maître cylindre tandem 23.It is also possible to adjust the dead travel of the secondary circuit of a tandem master cylinder. It is particularly advantageous in the case of adjusting the dead travel of the secondary circuit to use the pin 77 as an adjustment piece. Indeed, this pin is arranged in a bore allowing its change even after the complete assembly of a tandem master cylinder 23.
Après cet éventuel ajustement, on va en 137 où le procédé de fabrication selon l'invention est terminé. Sur la figure 9, on peut voir un exemple avantageux de processus de fabrication de maître cylindre selon la présente invention avec ajustement en boucle fermée de la ou des valeur(s) de course morte Le processus de la figure 9 diffère de celui de la figure 8 en ce que après les étapes 139 et 141 on retourne en 125 pour effectuer le contrôle des modifications apportées. Si les valeurs mesurées ne conviennent pas, il est possible de parcourir plusieurs fois la boucle jusqu'à l'obtention du réglage désiré (ou si aucune pièce ne convient jusqu'au rejet d'un maître cylindre non conforme) Le choix des pièces d'ajustement aux étapes 139 ou 141 peut être un choix simple, incrémental (choix de la pièce présentant la plus faible différence de course morte avec la pièce précédemment essayée) ou des stratégies plus élaborées basées sur une étude statistique préalable avec la sélection de la pièce d'ajustement ayant les plus fortes chances d'assurer la compensation désirée) pour minimiser le nombre d'exécutions de la boucle. Avantageusement, un compteur comportant par exemple une étape 143 d'initialisation antérieure à l'étape 125 et, dans la boucle une étape d'incrémentation 145 et une étape 147 de comparaison par rapport à une valeur maximale permet d'éviter de parcouπr indéfiniment la boucle avec une pièce défectueuse.After this possible adjustment, we go to 137 where the manufacturing process according to the invention is finished. In FIG. 9, an advantageous example of a master cylinder manufacturing process according to the present invention can be seen with closed-loop adjustment of the dead travel value (s). The process in FIG. 9 differs from that in FIG. 8 in that after steps 139 and 141 we return to 125 to check the changes made. If the measured values are not suitable, it is possible to cycle through the loop several times until the desired setting is obtained (or if no part is suitable until a non-compliant master cylinder is rejected) The choice of parts adjustment in steps 139 or 141 can be a simple, incremental choice (choice of the part with the smallest difference in dead travel with the part previously tested) or more elaborate strategies based on a prior statistical study with the selection of the part most likely to provide the desired compensation) to minimize the number of loop executions. Advantageously, a counter comprising, for example, an initialization step 143 prior to step 125 and, in the loop, an incrementation step 145 and a step 147 of comparison with respect to a maximum value makes it possible to avoid over-indefinitely the loop with a defective part.
L'ajustement unitaire des pièces illustrées sur les figures 8 et 9 n'est pas toujours nécessaire dans la mesure où la maîtπse des productions industrielles permet d'obtenir une fabrication des pièces semblables appartenant à un lot de pièces fabriquées consécutivement sur une même machine.The unitary adjustment of the parts illustrated in FIGS. 8 and 9 is not always necessary insofar as the mastery of industrial productions makes it possible to obtain manufacture of similar parts belonging to a batch of parts produced consecutively on the same machine.
L'ajustement par lots de fabrication présente de nombreux avantages. Tout d'abord, la fabrication avec ajustement par lots de maîtres cylindres permet d'accélérer les opérations tout en suppπmant les opérations d'ajustement individuelles de maîtres cylindres. Par ailleurs, il est possible d'effectuer des mesures plus approfondies en sacπfiant un, ou plusieurs maîtres cylindres pour effectuer l'étalonnage du lot. En effet, on peut effectuer un essai avec diverses valeurs des pièces d'ajustement sans qu'il ne soit indispensable de démonter la pièce sur laquelle la mesure était faite, le résultat permettant de déterminer ou d'extrapoler les valeurs optimales à utiliser sur le lot de fabπcation qui va suivreAdjustment by manufacturing batch has many advantages. First of all, manufacturing with batch adjustment of master cylinders makes it possible to speed up operations while eliminating the individual adjustment operations of master cylinders. Furthermore, it is possible to carry out more in-depth measurements by sacrificing one or more master cylinders to perform the batch calibration. Indeed, it is possible to carry out a test with various values of the adjustment parts without it being essential to dismantle the part on which the measurement was made, the result making it possible to determine or to extrapolate the optimal values to be used on the manufacturing batch to follow
Dans l'exemple illustré sur la figure 10, on commence en 121. On va en 123In the example illustrated in Figure 10, we start at 121. We go to 123
En 123, on effectue l'assemblage d'un maître cylindre de mise au point.At 123, the assembly of a master focusing cylinder is carried out.
On va en 125.We are going to 125.
En 125, on effectue les mesures, avantageusement pneumatiques de fermeture du ou, avantageusement des clapets.In 125, the measurements are carried out, advantageously pneumatic, for closing the or, advantageously valves.
On va en 127We are going to 127
En 127, on calcule la course morte du ou des clapet(s)In 127, the dead stroke of the valve (s) is calculated
On va en 129 En 129, on calcule la différence Δ entre la course morte désirée CMréf et la course morte mesurée CM.We are going to 129 In 129, the difference Δ is calculated between the desired dead travel CM ref and the measured dead travel CM.
On va en 131.We're going to 131.
En 131, on vérifie si le maître cylindre ainsi élaboré coπespond aux tolérances désirées.In 131, it is checked whether the master cylinder thus produced corresponds to the desired tolerances.
Si oui, on va en 149. Si non, on va en 135.If yes, we go to 149. If not, we go to 135.
En 149, on effectue la validation du choix des pièces nécessaires à la fabrication du lot.In 149, the validation of the choice of parts necessary for the manufacture of the batch is carried out.
On va en 151.We're going to 151.
En 151, on effectue la fabrication du lot de maîtres cylindres ajustés conformément à la présente invention. Dans un premier exemple de réalisation, le lot coπespond à un certain nombre de pièces. Par exemple le lot va comporter 300, 1000 ou 5 000 pièces suivant la stabilité du processus de fabrication, et par suite, suivant la dérive de tolérances.In 151, the batch of master cylinders adjusted in accordance with the present invention is carried out. In a first exemplary embodiment, the batch corresponds to a certain number of parts. For example, the batch will include 300, 1000 or 5000 pieces depending on the stability of the manufacturing process, and consequently, according to the drift in tolerances.
Dans une première variante, un lot coπespond à un temps de fabrication donné et non pas à un nombre de pièces fabriquées. Dans la variante avantageuse illustrée, un contrôle final, sur chaque pièce, ou par échantillonnage permet ou non de poursuivre la fabrication d'un même lot coπespondant au même choix des pièces d'ajustement de course morte.In a first variant, a batch corresponds to a given manufacturing time and not to a number of parts produced. In the advantageous variant illustrated, a final check, on each part, or by sampling makes it possible or not to continue the manufacture of the same batch corresponding to the same choice of dead stroke adjustment parts.
Dans l'exemple illustré, de 151, on va en 153. En 153, on vérifie par une mesure et une comparaison que la ou les courses mortes coπespondent aux tolérances désirées.In the example illustrated, from 151, we go to 153. In 153, we verify by a measurement and a comparison that the dead stroke or strokes correspond to the desired tolerances.
Si oui, on retourne en 151 pour la poursuite de la fabrication du lot.If yes, we return to 151 for the continuation of the manufacture of the batch.
Si non, on va en 137 avec aπêt de fabrication de lot avec éventuellement un retour en 121 pour effectuer un étalonnage d'un nouveau lot de maîtres cylindres à fabriquer.If not, we go to 137 with batch manufacturing aπêt with possibly a return to 121 to calibrate a new batch of master cylinders to be manufactured.
En 135, on vérifie si la valeur de la différence Δ entre la course morte désirée et la course morte mesurée est négative.In 135, it is checked whether the value of the difference Δ between the desired dead travel and the measured dead travel is negative.
Si oui, on va en 139.If yes, we go to 139.
Si non, on va en 141.If not, we go to 141.
En 139, on remplace au moins une des pièces assurant l'ajustement avantageusement choisie dans un ensemble comportant la tige 51 du clapet 37, la goupille 55 et la bague 57 par au moins une pièce ou une combinaison de ces pièces diminuant la course morte. Par exemple, on choisit une tige 51 plus courte, une goupille 55 dont la zone 99 a un diamètre plus petit ou une bague 57 ayant un épaulement 95 de plus faible épaisseur.In 139, at least one of the parts ensuring the advantageously chosen fit is replaced in an assembly comprising the rod 51 of the valve 37, the pin 55 and the ring 57 by at least one part or a combination of these parts reducing the dead travel. For example, a shorter rod 51, a pin 55 whose area 99 has a smaller diameter or a ring 57 having a shoulder 95 of thinner thickness is chosen.
En 139, on peut éventuellement également effectuer l'ajustement de la course morte du clapet secondaire d'un maître cylindre tandem. On va en 149In 139, it is optionally also possible to adjust the dead travel of the secondary valve of a tandem master cylinder. We are going to 149
En 141 on effectue le montage des pièces fonctionnelles assurant, contrairement a l'étape 139, 1 augmentation de la course morte, par exemple par montage d'une tige 51 de plus grande longueur, d'une goupille 55 ayant un plus fort diamètre au point de contact avec la tige 51 et/ou d'une bague 57 présentant un épaulement 95 de plus grande épaisseurIn 141, the functional parts are mounted ensuring, unlike in step 139, 1 increase in the dead travel, for example by mounting a rod 51 of greater length, a pin 55 having a larger diameter at point of contact with the rod 51 and / or a ring 57 having a shoulder 95 of greater thickness
On peut également effectuer un éventuel ajustement de la course morte du circuit secondaire d'un maître cylindre tandem II est particulièrement avantageux dans le cas de l'ajustement de la course morte du circuit secondaire d'utiliser la goupille 77 comme pièce d'ajustement En effet, cette goupille est disposée dans un perçage permettant son changement même après l'assemblage complet d'un maître cylindre tandem 23It is also possible to make an adjustment of the dead stroke of the secondary circuit of a tandem master cylinder II is particularly advantageous in the case of adjustment of the dead stroke of the secondary circuit to use the pin 77 as an adjustment piece. Indeed, this pin is arranged in a hole allowing its change even after the complete assembly of a tandem master cylinder 23
On va en 149We are going to 149
Sur la figure 1 1, on peut voir l'exemple préféré d'un processus de fabrication avec ajustement selon la présente inventionIn Figure 1 1, we can see the preferred example of a manufacturing process with adjustment according to the present invention
Ce processus diffère du processus de la figure 10 en ce que on effectue un contrôle en boucle fermée c'est à dire que de 139 ou de 141, on retourne en 123 de manière à assurer un nouvel assemblage d'un maître cylindre d'étalonnage de fabrication de lots. Il peut s'agit du même maître cylindre que précédemment mais équipé avec de nouvelles pièces d'ajustement de courses mortes ou d'un nouveau maître cylindre d'étalonnage, jusqu'à l'obtention des tolérances désirées (à l'étape 131) Le processus de la figure 1 1 permet de diminuer encore les tolérances des maîtres cylindres fabriqués. La présente invention s'applique notamment à l'industrie automobile.This process differs from the process of figure 10 in that one carries out a closed loop control, that is to say that from 139 or from 141, one returns to 123 so as to ensure a new assembly of a master cylinder of calibration batch manufacturing. It can be the same master cylinder as before but equipped with new dead stroke adjustment parts or a new calibration master cylinder, until the desired tolerances are obtained (in step 131) The process of Figure 1 1 further decreases the tolerances of the master cylinders manufactured. The present invention is particularly applicable to the automotive industry.
La présente invention s'applique principalement à l'industrie de systèmes de freinage pour véhicules automobiles et notamment pour voitures particulières The present invention applies mainly to the industry of braking systems for motor vehicles and in particular for passenger cars.

Claims

REVENDICATIONS
1. Procédé de fabrication d'un maître cylindre à clapet comportant les étapes consistant à assembler (123) un maître cylindre (23) comportant un piston (9, 67) mobile dans une chambre (41 , 83) équipé d'un clapet (37, 75) de manière à ce que l'avancement (39) du piston (9, 67) dans la chambre (41 , 83) coπespond en un premier temps à une course morte, clapet (37, 75) ouvert, suivi par une course utile avec diminution du volume interne de la chambre (41, 83), clapet (37, 75) fermé caractérisé en ce qu'il comporte en outre les étapes consistant à :1. Method for manufacturing a master cylinder with valve comprising the steps consisting in assembling (123) a master cylinder (23) comprising a piston (9, 67) movable in a chamber (41, 83) equipped with a valve ( 37, 75) so that the advancement (39) of the piston (9, 67) in the chamber (41, 83) coπespond at first to a dead stroke, valve (37, 75) open, followed by a useful stroke with reduction of the internal volume of the chamber (41, 83), closed valve (37, 75) characterized in that it also comprises the steps consisting in:
d) mettre en place une pièce d'ajustement (51 , 71 , 55, 77, 57) dans le maître-cylindre (23) assurant la commande d'ouverture du clapet (37, 75) lors de l'avancement (39) du piston (9, 67); e) mesurer (125, 127) la course morte; f) déterminer à partir de la mesure (125, 127) de la course morte, la géométrie de la pièce d'ajustement (51 , 71, 55, 77, 57) adaptée pour obtenir une course morte désirée;d) place an adjustment piece (51, 71, 55, 77, 57) in the master cylinder (23) ensuring the opening control of the valve (37, 75) during advancement (39) piston (9, 67); e) measuring (125, 127) the dead travel; f) determining from the measurement (125, 127) of the dead travel, the geometry of the adjustment piece (51, 71, 55, 77, 57) adapted to obtain a desired dead travel;
g) remplacer dans le maître cylindre (23) la pièce d'ajustement (51 , 71 , 55, 77, 57) utilisée à l'étape b par la pièce d'ajustement (51 , 71 , 55, 77, 57) déterminée à l'étape c de manière à modifier, notamment à réduire, la course morte du maître cylindre (23).g) replace in the master cylinder (23) the adjustment piece (51, 71, 55, 77, 57) used in step b with the adjustment piece (51, 71, 55, 77, 57) determined in step c so as to modify, in particular to reduce, the dead stroke of the master cylinder (23).
2. Procédé de fabrication d'un lot de maîtres-cylindres à clapet comportant les étapes consistant à assembler (123) un maître cylindre (23) comportant un piston (9, 67) mobile dans une chambre (41, 83) équipé d'un clapet (37, 75) de manière à ce que l'avancement (39) du piston (9, 67) dans la chambre (41, 83) coπespond en un premier temps à une course morte, clapet (37, 75) ouvert, suivi par une course utile avec diminution du volume interne de la chambre (41 , 83), clapet (37, 75) fermé caractérisé en ce qu'il comporte en outre les étapes consistant à : a) mettre en place une pièce d'ajustement (51 , 71 , 55, 77, 57) dans le maître-cylindre (23) assurant la commande d'ouverture du clapet (37, 75) lors de l'avancement (39) du piston (9, 67); b) mesurer (125, 127) la course morte du maître-cylindre (23) comportant la pièce d'ajustement;2. Method for manufacturing a batch of valve master cylinders comprising the steps of assembling (123) a master cylinder (23) comprising a piston (9, 67) movable in a chamber (41, 83) equipped with a valve (37, 75) so that the advancement (39) of the piston (9, 67) in the chamber (41, 83) first responds to a dead stroke, valve (37, 75) open , followed by a useful stroke with reduction of the internal volume of the chamber (41, 83), closed valve (37, 75) characterized in that it also comprises the steps consisting in: a) putting in place a piece of adjustment (51, 71, 55, 77, 57) in the master cylinder (23) ensuring the opening control of the valve (37, 75) during the advancement (39) of the piston (9, 67); b) measuring (125, 127) the dead stroke of the master cylinder (23) comprising the adjustment piece;
c) déterminer à partir de la mesure (125, 127) de la course morte, la géométrie de la pièce d'ajustement (51 , 71, 55, 77, 57) adaptée pour obtenir une course morte désiréec) determine from the measurement (125, 127) of the dead travel, the geometry of the adjustment piece (51, 71, 55, 77, 57) adapted to obtain a desired dead travel
d) monter sur une pluralité de maîtres-cylindres les pièce d'ajustement (51 , 71, 55, 77, 57) déterminées à l'étape c.d) mounting on a plurality of master cylinders the adjustment pieces (51, 71, 55, 77, 57) determined in step c.
3. Procédé selon la revendication 1 ou 2 caractérisé en ce que la pièce d'ajustement (51 , 71 , 55, 77, 57), à monter est choisie dans un ensemble de pièces analogues comportant une pluralité de géométries. chacune coπespondant. pour un maître cylindre donné, à une course morte différente.3. Method according to claim 1 or 2 characterized in that the adjustment part (51, 71, 55, 77, 57) to be mounted is chosen from a set of similar parts comprising a plurality of geometries. each one corresponding. for a given master cylinder, at a different dead stroke.
4. Procédé selon la revendication 1 ou 2 caractérisé en ce que postérieurement à l'étape c de détermination de la géométrie d'une pièce d'ajustement (51. 71 , 55, 77,4. Method according to claim 1 or 2 characterized in that after step c of determining the geometry of an adjustment piece (51. 71, 55, 77,
57), il comporte une étape de fabrication de ladite pièce d'ajustement (51 , 71 , 55, 77, 57) ayant la géométrie déterminée à l'étape c.57), it includes a step of manufacturing said adjustment piece (51, 71, 55, 77, 57) having the geometry determined in step c.
5. Procédé selon la revendication 4 caractérisé en ce que la fabrication de la pièce d'ajustement (51, 71 , 55, 77, 57) comporte une étape de formage de ladite pièce.5. Method according to claim 4 characterized in that the manufacture of the adjustment piece (51, 71, 55, 77, 57) comprises a step of forming said piece.
6. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que la pièce d'ajustement est une goupille (55, 77) de réception de l'extrémité (61 ) d'une tige (51 , 71) d'un clapet (37, 75) et en ce que la détermination de la géométrie de la goupille consiste en la détermination de son diamètre dans la zone6. Method according to any one of the preceding claims, characterized in that the adjustment piece is a pin (55, 77) for receiving the end (61) of a rod (51, 71) of a valve. (37, 75) and in that the determination of the geometry of the pin consists of the determination of its diameter in the area
(99) de contact avec la tige (51 , 71) du clapet (37, 75).(99) of contact with the rod (51, 71) of the valve (37, 75).
7. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que la pièce d'ajustement est une bague (57) comportant un épaulement d'appui de la goupille (55, 77) et en ce que la détermination de la géométrie de ladite bague consiste en la détermination de l'épaisseur de F épaulement.7. Method according to any one of the preceding claims, characterized in that the adjustment piece is a ring (57) comprising a support shoulder for the pin (55, 77) and in that the determination of the geometry of said ring consists in determining the thickness of F shoulder.
8. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que le maître cylindre à fabriquer et dont on a juste la course morte est un maître cylindre tandem comportant un circuit primaire et un circuit secondaire et en ce que l'ajustement des courses mortes s'effectue aussi bien au niveau du circuit primaire que du circuit secondaire.8. Method according to any one of the preceding claims, characterized in that the master cylinder to be manufactured and of which there is just the dead stroke is a tandem master cylinder comprising a primary circuit and a secondary circuit and in that the adjustment of the strokes dead occurs both on the primary circuit and on the secondary circuit.
9. Maître cylindre comportant un piston (9, 67) mobile dans une chambre (41 , 83) équipé d'un clapet (37, 75) de manière à ce que l'avancement (39) du piston (9, 67) dans la chambre (41 , 83) coπesponde en un premier temps à une course morte, clapet (37, 75) ouvert, suivi par une course utile avec diminution du volume interne de la chambre (41, 83), clapet (37, 75) fermé, en ce que le clapet (37, 75) comporte une tige (51, 71) dont une extrémité (61) repose sur une goupille (55, 77) caractérisé en ce qu'il comporte une bague épaulée de réglage de la position au repos de la goupille (55, 77) déterminant la course morte dudit maître cylindre. 9. Master cylinder comprising a piston (9, 67) movable in a chamber (41, 83) equipped with a valve (37, 75) so that the advancement (39) of the piston (9, 67) in the chamber (41, 83) initially corresponds to a dead stroke, valve (37, 75) open, followed by a useful stroke with reduction of the internal volume of the chamber (41, 83), valve (37, 75) closed, in that the valve (37, 75) comprises a rod (51, 71), one end (61) of which rests on a pin (55, 77) characterized in that it comprises a shouldered ring for adjusting the position at rest of the pin (55, 77) determining the dead stroke of said master cylinder.
EP01904011A 2000-02-02 2001-01-29 Method for making a master cylinder and master cylinder obtained by said method Withdrawn EP1252050A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0001810A FR2804397B1 (en) 2000-02-02 2000-02-02 METHOD FOR MANUFACTURING A MASTER CYLINDER COMPRISING AN ADJUSTMENT STEP AND MASTER CYLINDER OBTAINED BY SAID METHOD
FR0001810 2000-02-02
PCT/FR2001/000294 WO2001056852A1 (en) 2000-02-02 2001-01-29 Method for making a master cylinder and master cylinder obtained by said method

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EP1252050A1 true EP1252050A1 (en) 2002-10-30

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EP01904011A Withdrawn EP1252050A1 (en) 2000-02-02 2001-01-29 Method for making a master cylinder and master cylinder obtained by said method

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US (1) US6494040B2 (en)
EP (1) EP1252050A1 (en)
JP (1) JP2003521420A (en)
AU (1) AU2001231943A1 (en)
BR (1) BR0107555A (en)
FR (1) FR2804397B1 (en)
WO (1) WO2001056852A1 (en)

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FR2829736B1 (en) * 2001-09-20 2004-01-23 Bosch Gmbh Robert METHOD FOR ADJUSTING A TANDEM MASTER CYLINDER FOR AN ELECTROHYDRAULIC BRAKING SYSTEM, A PIN FOR IMPLEMENTING THE METHOD AND TANDEM MASTER CYLINDER FOR AN ELECTROHYDRAULIC BRAKING SYSTEM
FR2836437B1 (en) * 2002-02-25 2004-05-28 Bosch Gmbh Robert HYDRAULIC MASTER CYLINDER WITH DEAD RUNNING MASKING
US6871496B2 (en) * 2003-04-25 2005-03-29 Delphi Technologies, Inc. Adjustable dual center port compensation for master cylinder
FR2858958B1 (en) * 2003-08-19 2005-10-28 Delphi Tech Inc HYDRAULIC CONTROL CYLINDRICAL MASTER ASSEMBLY AND METHOD FOR ADJUSTING THE DEADLY RUN OF A PRIMARY PISTON
JP5026443B2 (en) * 2009-01-19 2012-09-12 日信工業株式会社 Hydraulic master cylinder for vehicle and manufacturing method thereof
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US20120124991A1 (en) * 2010-11-24 2012-05-24 Hb Performance Systems, Inc. Method and apparatus for lever stroke adjustment

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US6494040B2 (en) 2002-12-17
FR2804397A1 (en) 2001-08-03
BR0107555A (en) 2003-01-14
FR2804397B1 (en) 2002-05-03
AU2001231943A1 (en) 2001-08-14
JP2003521420A (en) 2003-07-15
US20020124564A1 (en) 2002-09-12
WO2001056852A1 (en) 2001-08-09

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