FR2537521A1 - MASTER CYLINDER - Google Patents

Abstract

INVENTION RELATING TO THE BRAKING OF VEHICLES. MASTER CYLINDER FOR HYDRAULIC PRESSURE SYSTEM, INCLUDING A PRESSURE CYCLE 1 ON WHICH A TANK 11 IS FITTED, THE INTERIOR VOLUMES OF THE CYLINDER AND OF THE TANK COMMUNICATING THROUGH A CONNECTOR 18. THE FITTING CONTAINS A SEAT 20 IN WHICH A TEST PROBE P CAN ENGAGE IN A WAY TO ALLOW A VARIATION OF THE ANGLE OF ENGAGEMENT OF THE SENSOR, WHILE ALLOWING TO MAKE A SENSITIVELY TIGHT SEAL BETWEEN THEM. APPLICATION TO THE REALIZATION OF HYDRAULIC BRAKES.

Description

The present invention, concerning the braking of vehicles, is more

specifically relating to a

  master cylinder for a hydraulic pressure system

  that, mainly for a vehicle braking system

  hicle, and more specifically to a master cylinder which

  includes a pressure cylinder and a reservoir, initiating

  separately, which is mounted on them, the volumes

  the pressure cylinder and the reservoir being

  communication through a transver-

  sal through the peripheral wall of the cylinder.

  For safety reasons, it is convenient

  commonplace to experience the good condition of new engine-cylinders

  assembled by applying in the interior of the cy-

  high pressure and by controlling unacceptable leaks

  which could result, for example, from damaged or incorrectly assembled components, such as

  pistons or seals O In this test 9 the hy-

  hydraulics under high pressure usually comes through a hollow and long probe that can be inserted into the tank and is put into communication

  with an internal orifice of the latter, which orifice

  in turn with the inside of the cylinder

  correctly such a probe in order to establish a connection

  substantially fluid tight may be

  difficult, especially when the transverse hole

  the cylinder is far from the tank in the long

  tudinal of the cylinder and it is necessary to establish a

  nication between this hole and the inside of the tank; this passage can arrive laterally in the tank, as for example in some of the arrangements described in the applicant's British application pending NO 2,082 277 because of the constraints imposed by the elements

  reservoir, the maneuvering of the probe for the

  in a satisfactory position from a suitable angle.

  for the purpose of making the connection can be

embarrassment.

  An object of the invention is to provide a master cylinder in which the engagement of a high pressure test probe into an internal reservoir is facilitated. According to the invention, a master cylinder

  for a hydraulic pressure system comprises a cy-

  pressure lighter and a tank, initially separated,

  mounted on it, the inner volumes of the cylinder

  wherein the pressure port and the reservoir are in communication through a coupling which provides a passage between the interior of the reservoir and a transverse orifice arranged

  through the peripheral wall of the cylinder; said

  cord being able to receive a test probe, in such a way

  to allow a certain degree of variation of the angle

  application of the probe in the device, while allowing

  making it possible to obtain a seal that is substantially impermeable to the fluid Ir between them. The coupling can provide a seat, typically of conical, partly spherical shape, which can be engaged by

  the end of the probe preferably having a cor-

  Conveniently the fitting can provide a base socket for receiving the probe and the seat is preferably located inside the socket

  In a convenient practical arrangement, a first

  part and a second part of the coupling are

  from a mutual angle, typically

  in particular, a part extending inside the

  The other portion extends substantially longitudinally with respect to the cylinder to be connected to a passageway axially directed with respect to the cylinder and communicating with said transverse cylinder orifice. The invention will be better explained and understood in

  referring to the following description, given as a

  for example, with reference to the accompanying drawings in which: Figure 1 is a longitudinal section of a form of

  master cylinder according to the invention; -

  Figure 2 is a cross section divided into two halves respectively along the lines A-A and B-B of Figure 1; -

  Figures 3 and 4 are cross-sections

  along the Y and X lines of Figure 2 and

  FIG. 5 is a detail, seen in plan, of an element constituting

  the malter cylinder of Figures 1 to 4.

  On the drawings we see a tandem cylinder

  intended for use in a braking system

  baked double and comprising a pressure cylinder 1 which has a blind axial bore 2 whose open end is closed by a closure piece having the shape of a sleeve 3 The bore 2 is divided by a piston 4 into pressure chambers 5 and 6, the piston being connected by a

  device 7 of variable length to another piston 8 to

  which is fixed an actuating rod 9 extending axially

  outside the cylinder O A spring 10 tends to

  trim pistons 4 and 8 a distance limited by

  telescopic positive 7 A tank 11 is mounted on the

  c 8 upper cylinder 1 and communicates with the chambers

  5 and 6 respectively by orifices 12 and 13 which are formed transversely through the wall of the cylinder The communication between the reservoir and the orifice

  13 is carried out through a passage 14,

  rection parallel to the axis of the master cylinder, fitted out

  the closing piece 3 The passage 14 is partially formed

  in an axial extension 16 of the closure and opens at one end into a recess 15 lying opposite the orifice 13 according to the invention, it

  there is provided a coupling 18 which is housed and connected hermetically.

  only in an existing opening in the base of the

  see 11 The free end of the extension 16 of the closure piece 3 is inserted in a portion 17 of the bore

fitting.

  A seal 16A surrounds the extension 16 inside the connecting device 18 and is held in place by

  an elastic clamp 21, for example spring steel.

  As can be seen in FIG. 5, the clip has a generally U-shaped shape and encloses a boss portion 22 of the connector 18 by its arms 21 Ag 21 B engaged elastically behind the projection portion 16 of the projection of the projection. closing 3 passes through the clamp 21 to lodge

  inside the fitting 18 as exposed.

  The piercing portion 17 communicates through a passage 18A with a flared opening 19 of the connector housed in the reservoir, the junction between the passage 18A and the opening 19 having the shape of a conical seat 20 set to allow the the engagement of a test probe under high pressure (indicated by a dashed line in P) in the chamber 6 of the

  my newly assembled cylinder, in order to test

  ver the good condition of the usual piston and its elements of 6-

  The conical seat provides the test probe with a relatively large approach angle for connection with the

  the connector 18 to facilitate its use.

  the normal operation of the master cylinder de-

  written above is quickly clear for a specialist and he

will not be exposed further.

  Before the master cylinder is adopted for use in a vehicle braking system, the above pressure test of the pressure chamber 6

  is done using the P probe. We see that the pres-

  test pressure acts on the inner end of the piston 8

  and the resulting force on the piston reacts on a ron-

  elastic strap or circlip 8 A, housed in a groove of

  the cylinder wall The test pressure is also exerted

  on a relatively large area of the farmhouse

  3, defined by the ring formed by a joint 23

  rant the actuating rod 9 and it is important that the considerable force generated by this pressure is not applied to a fragile structure, such as the envelope

  24 of an associated servo mechanism, because this could involve

  damage for this structure.

  This force is supported by the cylinder 1 and in the present embodiment, this is achieved by employing a coupling device in the form of a generally U-shaped clip 26 of spring steel (FIG. the arms 27 pass through openings

  transversals 28 formed in the closure part of ex-

  3 and engage in an annular groove 29

  formed in the outer peripheral surface of the cylinder

  The inner end portions 27 A of the arms 27 have a greater width than the rest of the arms 9 of

  so that the arms are able to engage in the reason-

  29 on a substantial part of its arcuate extent O

  This arrangement effectively locks the iron piece

  set 3 on the cylinder, so that any axial force

  applied to the closure part 3 such as that

  resulting from the high pressure test mentioned above.

  tion, is directly transmitted to the cylinder and not, for example, to the housing 24 of the intensifier In this embodiment, the coupling device is located at

  inside the intensifier housing 24 and it is now

  held in place therefore 1 l can be removed as a result

  easily enough to allow the dismantling of the

  this closing 3 in order to provide access to the interior

  of the cylinder when necessary.

Claims (6)

  1 Drum master cylinder for a hydraulic pressure system, characterized in that the master cylinder comprises a pressure cylinder (1) and a reservoir (11), initially separated and mounted thereon, the inner volumes of the pressure cylinder and the reservoir are in communication via a connector (18) which provides a   passage between the inside of the tank and a trans-   side of the peripheral wall of the cy-   lindre, said connector being capable of receiving a probe   test (P), so as to allow a certain degree of   the angle of application of the probe in the   positive, while allowing a sensitive joint to be   fluid-tight between them.   2 My trolley according to claim 1,   characterized in that the coupling has a seat (20) which engages   geable by the end of the probe.   The master cylinder according to claim 1 or 29   characterized in that the seat has a conical or   O-drum according to claim 2 or 3, characterized in that the coupling provides a socket of   base for receiving the probe and that the seat is inside the socket.   My cylinder-cylinder according to claim 1,   characterized in that a first part and a second part   part of the fitting are arranged at a mutual angle, one   parts extending inside the tank and   locating a seat (20) engageable by the end of the probe (P), the other extending substantially longitudinally by   relative to the cylinder to be connected to a passage (14)   in the axial direction relative to the cylinder and   m Uaiquant with a hole (13) transverse in the cylinder, which is spaced from the reservoir in the longitudinal direction by compared to the cylinder.   Filler-cylinder according to claim 5,   characterized in that said first part and said second   part are mutually perpendicular 7 Mattresses according to any one of   preceding claims, characterized in that the connection   is a separate element that is housed and connected hermetically   only in an opening of the tank.   8 Master cylinder according to any of the   Claims 5 to 7, characterized in that said other part   part of the coupling is connected to an axial extension of   cylinder end closure cap, said   lie down being hollow and constituting said passage extends axially.   9 master cylinder according to claim 8,   characterized in that a seal surrounds said extension a-   xial inside the connections the seal being held in place by an elastic clip (21) which is traversed by said extension and which engages around a boss fcho on the fitting.