FR2638506A1 - ELECTROMAGNETIC VALVE DEVICE - Google Patents

Abstract

The invention relates to an electromagnetic valve device. This device comprises a housing 2 forming a housing for the first ends of a plurality of electromagnetic valves 1 and arranged so that said electromagnetic valves can be mounted integrally in this housing, an end cylinder head 3, which is joined together. 'integrally at the other ends of said electromagnetic valves 1 and constitutes part of a magnetic path, and clamping means 4 making it possible to hold said electromagnetic valves 1 between said end cylinder head 3 and said casing 2. Application in particular in brake control circuits for motor vehicles.

Description

The present invention relates to a valve device

  electromagnetic, able to control the pressure

  brake fluid for a vehicle. There is one

  description of such an electromagnetic valve device

  in the Japanese utility model set to

  the public inspection under the N 1986-82185.

  The electromagnetic valve device is arranged to be disposed between a passage for a liquid applied to the brake cylinder and a passage for

  the application of this liquid to the master cylinder, the

  with electromagnetic valves acting in such a way as to

  maintain the fluid pressure in a com-

  antilock brake system of a brake system for a vehicle.

  When the anti-lock control device is activated, a liquid under pressure is delivered through the passageway connected to the brake cylinder to the passage connected to the

  master cylinder, via the pressure device

  electromagnetic papules, at the initial stage of the braking operation, although liquid may be sent to the master cylinder via the electromagnetic valve device when braking ceases. he

  As a result, since the liquid must pass through the

  with electromagnetic valves when removing the

  braking, excessive resistance may be re-

  excessive reliance on the speed of return of

quide.

  In order to solve this problem, that is to say

  to improve the response characteristic, provision should be made

  a check valve between the passage connected to the cy-

  brake liner and the passage connected to the master cylinder, the check valve acting as a bypass

  able to increase the speed of return of the liquid.

  One could consider using a structure arranged so that the return stroke of the valve is set to a value large enough to expand

  the passage and reduce the resistance.

  In accordance with conventional countermeasures, a

  Excessive space must be provided to house the anti-

  back in the electromagnetic valve device, or it is necessary to increase the capacity of the electromagnet to increase the lifting stroke of the valve, to increase the speed of lifting of the valve, another imperative residing in the fact to increase

the stiffness of the return spring.

  That is, it is necessary to increase the size of the electromagnetic valve device in accordance with any of the countermeasures described above.

  However, the increase in the size of

  positive electromagnetic valves causes a disadvantage

  critical in the braking system, in which it is necessary to reduce the dimensions

  that space must be provided by multiplying the capacity

  cited a single valve by the number of electromagnetic valve devices, when considering the joint installation of a multiplicity of electromagnetic valve devices. The present invention has been developed to solve the problem indicated above. That is why

  It is an object of the present invention to provide a device

  with electromagnetic valves, in which there is a

  uniform return of the liquid and in which it is not born

  provide an individual space for the check valve. In addition one can significantly reduce

  the overall dimensions of the structure formed in

  together a multiplicity of electromagnetic valves

  netic. The first aspect of the present invention resides

  in a device with electromagnetic valves, characterized

rised in that it comprises:

  a housing housing for first ex-

  tremities of a plurality of electromagnetic valves, and

  arranged so that said electromagnetic valves

  ticks can be mounted in an integrated way in this

  ter, an end cylinder head, which is joined by a single

  at the other ends of said electromagnetic valves

  and a part of a magnetic path; and

  clamping means for joining the end yoke

  and the housing so as to maintain said electromagnetic valves

  ticks between said end yoke and said housing.

  The second aspect of the present invention is

  in a device with electromagnetic valves, characterized

  in that it comprises an electromagnetic valve arranged so that a passage is open and closed

  between first and second passages under the effect of

  applying a valve stem, movable by means of a piston driven by an electromagnet, against a valve seat disposed in a housing, a passage being formed inside said valve seat, characterized in that he

  comprises a movable annular seal mounted

  turn of said valve seat and having an outer periphery

  may come into contact with the surface

  upper of said housing so as to separate said first passage of said second passage, and said movable annular seal is formed by a unidirectional valve arranged so that the direction extending from said first passage towards said

  second pass constitutes the direction of transmission

rect.

  In accordance with the first aspect of this

  tion, since the structure is arranged

  that the housing design allows this housing to be used as a housing for the first ends of the set of electromagnetic valves, and that can be arranged

  in an integrated way this set of electromagnetic valves

  the other ends of the electromagnetic valves

  ticks are fixed by means of an end yoke which is part of a magnetic path, and the electromagnetic valve is held between this end yoke and

  the housing by means of clamping means, the electric valves

  tromagnets which can be arranged close to one another. As a result, it is possible to reduce

  overall dimensions of the electromagnetic valve device

  ticks. Moreover, since the different valves

  electromagnetic are perfectly integrated into the car-

  ter, the strength of the structure can be improved by

important part.

  In accordance with the second aspect of this

  when the pressure of the liquid in the first

  The first passage becomes greater than the pressure of the liquid in the second passage, the movable seal, which separates the two passages, opens, so that the liquid returns to the second passage. As a result, it is possible to obtain a device with electromagnetic valves, which has small dimensions, while not including any

  individual anti-return valve but assuming the same function

  than that which can be carried out by the antireflection

tower.

  As a result, by combining the first and second

  cond aspects of the present invention, previously described

  the dimensions of the electronic valve can be reduced

  series-mounted magnetic type, this electromagnetic valve

  to obtain an excellent speed of recognition

turn of the liquid.

  Other features and advantages of the pre-

  invention will emerge from the description given below.

  after making reference to the accompanying drawings, on

  which: - Figures 1 and 2 represent views of which

  each shows a first embodiment of the present invention.

  FIG. 1 being a cross sectional view of FIG.

  versale, while Figure 2 is a plan view; and FIG. 3 is a cross-sectional view showing a second embodiment of FIG.

present invention.

  The embodiments will be described below.

of the present invention.

  First Embodiment This embodiment is characterized in that four individual electromagnetic valves are

  integrated to form a unitary structure.

  A housing 2 has a rectangular shape and has two recessed portions 2a formed to form housings for the first ends of the four electromagnetic valves 1. In addition eight holes for bolts are formed in the housing 2. From the first passages 14 leaving of these recessed portions 2a to lead to a brake cylinder (not shown on

  the drawings) and a second passage 15 starting from said parts

  recesses to a master brake cylinder (not shown in the drawing) are arranged so that the electromagnetic valves 1 can be

  arranged in an integrated way in the parts

darkly 2a.

  On the other hand, the passages la intended to be connected to a tank (not shown in the drawings)

  are provided on the other side of the electromagnetic valves

  1, these passages being connected to the tank. An end yoke 3, which can be integrally connected to the electromagnetic valves i, is provided so that the ends of the passages 1a are intended to be connected to the

  tank can open in the open air.

  The end yoke 3 is in direct contact with electromagnets 12, which actuate the electromagnetic valves 1, so that the end yoke 3 forms part of a magnetic path for each of the solenoid valves 1. The yoke end 3 has a rectangular plate-shaped structure, in which are formed eight holes 3a for bolts

  and four holes 3b for mounting the electromagnetic valves

netic.

  The positions of the holes 3a provided for the

  Ions are chosen so as to correspond to the positions of the holes 2b provided for the bolts and arranged in the casing 2, these holes 3a and the holes 2b being coupled by

  screwing by means of clamping means 4, namely

  lons. As a result, the end yoke 3 and the car-

  2 can be coupled so that the electromagnetic valves 1 can be held firmly between the end yoke 3 and the housing 2. As previously described and in accordance with the present embodiment, the structure is arranged so that the shape of the casing 2 allows to use the latter as

  that housing for one side of all the electric valves

  1, which can be mounted in an integrated manner, while the other ends of the electromagnetic valves 1 are fixed by the end yoke 3, which is part of a magnetic path so that the electromagnetic valves 1 are held by said clamping means 4 disposed between the end yoke 3

  and the housing 2. That is why the electromagnetic valves

  ticks can be arranged close to each other, which can be significantly reduced

  the overall dimensions of the electronic valve device

  magnetic. In addition, since all the

  electromagnetic papues can be fixed simultaneously

  2, the assembly of the electromagnetic valve device can be easily completed. In addition, since the housing 2 is formed in one piece, the

resistance can be improved.

Implementation form 2

  In the following, we will describe a second form of

  embodiment of the present invention, with reference to Fig. 3. Referring to the drawings, there is provided a housing

  having a cylindrical shape, on the outer circumference

  electromagnets are arranged. 12. The

  housing 10, which correspond to the electromagnets

  12, are constituted by non-magnetic bodies 20a. The place

  The arrangement 10 comprises valve assemblies arranged in series in the axial direction, each valve assembly comprising an expansion valve A of a normally closed type and a holding valve B of a normally open type. The holding valve B is structured so that a valve stem 13 can be moved by means of a

  piston 13a, arranged so as to be driven by the electrodes

  12, can be brought into contact with a seat of

  valve 11 in which is formed a passage lla.

  As a result, a passage can be opened and

  closed between the first passage 14 and the second passage 15.

  An annular mobile seal 16 is

  mounted around the valve seat 11, and its outer circumference

  is arranged in such a way as to be in contact with the sur-

  outer face of the housing 10 so that the first step

  wise 14 and the second passage 15 are separated one of

  the other. The mobile seal 16 comprises a part

  skirt tie protruding towards the second passage 15 so that this seal can serve

  unidirectional valve arrangement arranged in such a way that

  between first pass 14 and second pass 15

  constitutes the direction of direct passage.

  The valve stem 13 is integral with the piston 13a

  and has two ends that are supported, with pos-

  sliding ability, by guides 13b and 13c in the

  axial direction. Similarly, a passage is formed respectively

  in the outer circumference of piston 13a and

  guides 13b and 13c of the valve stem. A coil spring

  coidal S is interposed between the piston 13a and the guide 13c of the valve stem 13 so that the latter is in

  Permanently spaced from the valve seat l.

  Hereinafter, we will describe the operation of the

  electromagnetic valve shown in Figure 3.

  The second passage is connected to the master cylinder

  brake pressure that the pressure of the liquid in the pas-

  It increases with the application of a force to a brake pedal (not shown in the drawings). The liquid delivered by the second passage 15 is sent by the

  first passage 14 through the passage lla me-

  swam in the valve seat 11 and through

  the holding valve 13, which has been opened.

  So when the anti-theft control device

  blocking is activated (which is not described here)

  the valve stem 13 of the holding valve B is lowered as shown in the drawing so that the passage 11a extending from the second passage 15 to the

first pass 14, is closed.

  When the driver removes his foot from the brake pedal, the pressure of the liquid in the second passage 15 decreases rapidly. At this time, the valve stem 13 of the holding valve B rises as is visible in the drawing so as to open the passage lla. As a result, the liquid returns from the first passage 14 to the second passage 15. Simultaneously, the movable seat 16, which separates the first passage 14 from the second passage 15 is placed at

  the open state, so that the liquid in the first

  passage 15 returns rapidly, and in an im-

  in the second passage 15. Consequently, the

  braking system response can be improved and a preparatory state is established for

the next operation.

  As previously described, given

  that the movable sealing member 16 also serves as a

  anti-return gate, an electromagnetic valve device may be provided which has small dimensions and

  has no individual anti-return valve, but

  a function similar to that which can be performed

by the non-return valve.

  Although the description was made with respect to

  concerns the structure of a single electromagnetic valve

  with reference to FIG. 3, a multiplicity

  city of electromagnetic valves in series with each

  cune the movable sealing member 16, so as to form a unitary structure as shown in Figure 1. Although the present invention is applied to two-valve type electromagnetic valve device, in

  electromagnet and piston are combined

  vertically, the present invention can naturally

  be applied to an electromagnetic valve of

  single type, in which only one electro-electric

mant and a single piston.

Claims (5)

  1. Device with electromagnetic valves,   characterized in that it comprises: a casing (2) forming a housing for first ends of a plurality of electromagnetic valves   (1), and arranged in such a way that said electric valves   tromagnets can be mounted integrated in this casing, an end yoke (3), which is joined together   alone holding at the other ends of said electric valves   tromagnetic (1) and constitutes part of a gnétique; and   clamping means (4) for joining the cylinder head of   the housing and the housing so as to maintain the said electromagnetic valves   gnets (1) between said end yoke (3) and said housing (2).   2. Device with electromagnetic valves,   characterized in that it comprises an electromagnetic valve   that (1) disposed such that a passage is open and closed between first and second passages (14,15) under   the effect of applying a valve stem (13), displacing   can be removed by means of a piston (13a) driven by an electromagnet   mantle (12), against a valve seat (11) disposed in a housing (10), a passage being formed inside said valve seat, characterized in that it comprises a movable annular seal (16). ) mounted around said valve seat (11) and having an outer periphery   brought into contact with the inner surface of said   (10) to separate said first passage (14) from said second passage (15), and that said joint   mobile annular sealing ring (16) is formed by a   unidirectional poppet arranged so that the direction extending from said first passage (14) towards   said second passage (15) constitutes the direction of trans- direct mission.   Electromagnetic valve device according to claim 2, characterized in that it is used in a braking system for a vehicle and said first passage (14) is connected to a brake cylinder,   while the second passage (4) is connected to a master   brake cylinder. 4. An electromagnetic valve device according to claim 2, characterized in that said valve stem (13) is integrally fixed to a piston (13a), and that both ends of said valve stem can slide axially supported by a couple of guides (13b, 13c).   5. An electromagnetic valve device according to claim 2, characterized in that it is arranged in the form of a double valve comprising two sets of electromagnets (12) and pistons (13a) arranged in series. in the axial direction.