FR2485140A1 - DEVICE FOR TRANSMITTING THE PRESSURE OF THE SUCTION SIDE OF AN INTERNAL COMBUSTION ENGINE TO AN AUTOMATIC TRANSMISSION - Google Patents

Abstract

THIS DEVICE IS OF THE HOUSING TYPE IN A CHAMBER CONNECTED TO THE SUCTION SIDE OF THE MOTOR AND CLOSED BY A MEMBRANE, THE MOVEMENT OF THE MEMBRANE WHICH IS EXERCISED IN THE CHAMBER DUE TO THE PRESSURE BEING TRANSMITTED TO A SWITCHING BUTTON COOPERATING WITH THE CONTROL BOX SPEED AND GEARBOX SPEED CHANGES BEING TRIGGERED DEPENDING ON ITS POSITION, IT INCLUDES A 22 POWER GENERATOR WHOSE FORCE DEPENDS ON ATMOSPHERIC PRESSURE AND ACTS AGAINST A DISPLACEMENT OF THE 18 SWITCH BUTTON OF THE MAKES A CHANGE IN ATMOSPHERIC PRESSURE.

Description

The present invention relates to a device for trans-

  pressure on the suction side of a motor

  internal combustion tor has an automatic gearbox between the engine and a driven device, in a chamber connected to the suction side of the engine and closed by a membrane-7 the movement of the mebrane which is exerted in the chamber due to the pressure etan5 transmitted in a fewsscir of commuta '-, - l

  cooperating with speed boié and chan-gen: ents de vi. -

  se of the gearbox being purchased according to s-.

  position0 In a known device of this type which triggers the speed gearbox of the gearbox at the end of the regniana depression :. the aspirtron side of the c: tion motor! n% -erie, the pear-- This change-r changes according to,

  c-hangeeents of the pre-; or atmospheric in particular quót-

  it is an automobile veh-rl that climbs Or goes down a slope. The colns6qence es', e displacement of 3_a speed of reÈ: ._ me of the engine in a zone unfavorableo The object of the invention is a device of the type tention3 born in the preamble Dt functioning largely independently of the atmospheric pressure changeso According to invention this problem is solved because a power generator whose strength depends on is provided

  atmospheric pressure and acts against a displacement

  of the switching button due to a modification of

atmospheric pressure.

  The pusher then virtually retains its position dA-

  terminated by the vacuum prevailing on the suction side of the internal combustion engine, regardless of changes

  of atmospheric pressure, so that the point of change

  gearbox gear is also independent

  Advantageously, during atmospheric pressure, the power generator is supported by

  one side on the chamber and the other side on the membrane.

  Thus, the force of the power generator opposes, without being hindered, a movement of the membrane when there is a change in pressure in the chamber due to a modification of the

  atmospheric pressure, which causes a displacement of the

  evening due to a change in air pressure is A

correspondingly compensated.

  The distance separating the power generator from the

  membrane can be changed by means of an adjustment screw.

  Because one side of the power generator presses against the chamber and is therefore fixed, it is possible to obtain

  by adjusting the adjusting screw a modification of the pre-

  strap applied to the power generator, so that its characteristic transmission line can be easily adapted to the characteristic transmission line

O10 from the bedroom.

  A support can be fixed in the chamber against which the power generator is applied by a side, while the other side of this power generator is retained.

  linked to the diaphragm, the power generator connects

  health towards the transmission when there is an increase

  mentation of atmospheric pressure. In this case, ie

  power selector seoqve of the support from one side when the atmospheric pressure exceeds a predetermined value,

  and preferably normal pressure. The value can also

  ment to be chosen so as to correspond to the maximum possible atmospheric pressure. So the setting area

  of the power generator is used optimally.

  In addition, the switching button can be connected

  rigidly to the nemibrane via an eli-

  surrounding the power generator without touching it.

  This makes it possible to produce a transmission device which is compact and short in the direction of transmission, and whose

  the characteristic line of transmission is largely inde-

  pending temperature fluctuations.

  A particularly simple embodiment of the general

  The power generator consists of a pressure capsule.

  When the power generator includes at least one

  bellows, its own prestress can be obtained by the

  elasticity specific to the bellows, which avoids

  particular pre-tension spells. When the generator

  power includes several bellows, the lack of a bellows-

  flet does not result in total failure and imm6-

date of the power generator.

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  Then you can establish a depression or vacuum in

  the capsule and its elastic force can be opposed to the

  pressure. The vacuum has the advantage of making it possible to keep the moisture content in the capsule at a very low level due to the absence of air, and, therefore, to maintain the temperature sensitivity of the characteristic line of the capsule due to the humidity which evaporates according to the

  temperature at an extremely low level.

  In addition, one may object to a change in the po-

  sition of the membrane due to a drop in pressure in the

  chamber by means of a spring whose force can be adjusted.

  This adjustable spring force makes it possible to exert an additional influence on the characteristic line of transmission of the

  transmission device to adapt it to each use case

reading.

  The drawing represents a preferred embodiment of the transmission device according to the invention, shown

partially in section.

  The transmission device comprises a housing consisting of

  with an upper part 2 and a lower part 3.

  The upper part 2 forms a cylindrical chamber which is closed by a membrane 4 stretched between the upper part 2

  and the lower part 3 and which is connected by the intermediary-

  re of a tube 5 on the suction side of an internal combustion engine

  dull (or internal combustion machine) of a motor vehicle

bile.

  In chamber 2 are mounted axially movable a plate

  spring loaded plate 6, a membrane plate 7 applied against the

  diaphragm 4 and a helical pressure spring 8 dis-

posed between these.

  Chamber 2 has, in a recess in the wall

  which faces a diaphragm 4, a hole 9 which is closed hermetically

  tick during operation by a cover 10. To be able to adjust the force of the pressure spring 8, the cover 10 is removed and the spring plate 6 is pushed back using a pressure punch (not shown) until that we reach the desired strength. When the spring plate is in this position} you practice from the outside on the

24 8 5 140

  side wall of the chamber 2 a rib 11 against which the spring plate 6 can bear. We then put back in place

cover 10.

  The lower part 3 of the housing comprises an element in the form of a stirrup 12 constituted by a cylindrical part 13 and axial projections 14. In addition, it contains a transverse wall 15 fixed axially to the side wall of

  the lower part 3 and comprising near its pros-

  tower of the openings 15a intended for the passage of the projections 14 of the wall of the stirrup 12. The projections 14 are fixed by their free ends to a transverse plate 16 disposed

  also & the lower part 3 of the shoemaker, and whose

  riphery is located at a certain distance from the internal side of the side wall of the lower part 3. On the transverse plate 16 is fixed a receiving or centering piece 17 intended for a switching push-button 18 which is, in its

  side, fixed in the bore of the centering piece 17.

  The cylindrical part 13 of the stirrup 12 is applied, by its front face, against the membrane 4. A rivet with a flat head

  19 is introduced into the concentric holes of the mem-

  brane 7+ of membrane 4 and stirrup 12, hermetically

  that, and it keeps those parts together.

  The flat head rivet 19 is provided with a threaded through bore in which is screwed an adjustment screw 20 provided with an internal hexagon located opposite a concentric hole 21 of the spring plate 6. After adjustment of the screw 20, this can

  be held in position by means of a seal and made her-

  metric compared to the threaded bore. The other end of the adjustment screw 20 is fixed to a power generator 22 in the form of a pressure capsule-constituted by several bellows 23 arranged in series, and welded tightly _ _ tique, for example, in a hole on the front side of the upper bellows 23, as shown in the figure. The bellows 23 are

  connected to each other - while the lowest bellows 23.

  rests freely against the transverse wall 15. A vacuum is created in all the bellows 23 and they have wavy upper and lower sides (which cannot be seen on

  the schematic representation of the drawing), acting as springs--

2485 1 40

  pressure and which are applied against the d6pres-

  sion in the internal enclosure or against the higher external pressure prevailing on the external side of the capsule 22 which is in connection with the atmosphere, so as to lengthen the capsule in the axial direction. The transverse wall 15 and the

  lower part 3 then serves to support the capsule 22.

  The adjusting screw 20 is adjusted, after having removed the cover ring 10 and by means of a hexagon wrench which is passed through the holes 9 and 21 below the normal atmospheric pressure so that the capsule 22 s' presses against the transverse wall 15 and the centering piece 27 applies exactly to a connecting piece 24e

  The connecting piece 24 is fixed on the inf6 side.

  laughing from the lower part 3 in a hole in the lower part

  3 and connects it to an opening of the bo -

  tier of an automatic gearbox located between the

  tor and the wheels of the motor vehicle The pusher 18 passes

  with some play in a bore 25 of the connecting piece

  24 and is used to operate a pressure switch in the gearbox which causes the gearbox to change speed according to the position of the pushbutton 18o. The internal space of the lower part 3 of the housing is in connection with the atmosphere through bore 25

and the gearbox.

  When the engine is stopped, atmospheric pressure prevails in chamber 2 and in the lower part 3 of the housing. It will also be assumed that this is normal atmospheric pressure (around 1000 millibars) o In this case,

  the capsule 22 and its bellows which is at the bottom 23 is applied

  bends under pressure against the transverse wall 15, then

  that the centering piece 17 is applied to the connecting piece

  24 by being subjected to the pretension of the spring 8.

  When the engine is started due to vacuum

  engine ration, the pressure decreases on the suction side,

  and therefore in room 2. As in the lower part-

  re 3 continues to regain normal pressure, that is to say a higher pressure than that prevailing in chamber 2, the

2485 1 40

  diaphragm 4 moves against the force of the spring UG upwards inside the chamber 2. Due to the

  rigid connection of the membrane 4 with the pusher 1 'nar the

  intermediate the stirrup 12, the plate 16 and the centering niece 17, the canister is moved over the same distance as the membrane 4. For a predetermined position of the nonssoi: 1-, there is in the gearbox a change to the next higher speed (lowest engine speed). During this movement, the capsule 22 is not. pl. s subjected to the force of spring 8 and it goes on: e a-iale! oen +

  But if during this movement the pressure of a +: osrhèr cimi-

  naked, for example when the vehicle climbs a slope at the resi7n.

  do not drop in room 2 in the same me "read -ue da a

  lower part 3 of the fact that there is necessary: t ue po'i-

strangulation between the connection position killed on the suction side of the engine and the atmosphere, then key?

connection of the internal enclosure of the lower part 3 does not

feel practicing no strangling position with 'a cs-

sphere. Without capsule 22, the membrane 4 would not move so deeply inside the chamber 2 due to the

  pressure drop to -spkriqse and pusher 18 reaches-

should be late in shift position. From this

  In fact, the engine would have passed too late on a lower speed.

  ble, which means that it would rotate at too high a speed

vee.

The capsule 22 which is interposed inside is used in

this case of auxiliary device. When the atmospheric pressure

  that drops in the lower part 3 of the housing, a lower air pressure and coming from the outside then acts on the capsule 22, so that the elastic force of the capsule which acts towards the outside causes an elongation axial

more pronounced capsule 22 which rests on the trans-

versal 15 and that the membrane 4 and therefore the pusher 16 are moved over a greater distance towards the interior of the chamber 2 due to the force of the capsule

  which then becomes free, and the gear change takes place

  kills in the correct position. When the oression of the atmnos-

sphere increases, ratios are reversed as long as atmospheric pressure 7. does not exceed normal pressure. Above normal pressure, the capsule compresses and lifts

of the transverse wall 15, and it therefore has no more influence

on membrane 4 or on pusher 18. But the case of an increase in atmospheric pressure above

normal pressure is relatively unimportant compared to

  port to changes in air pressure and such as can be caused by a mountain run with hills and flat parts. In any case, the atmospheric pressure at which the capsule lifts from the transverse wall 15 can be adjusted by means of the adjusting screw 20 and / or the spring plate 6 to a higher value, so that this capsule 22 and thus its effect

compensator is also effective for all pres-

atmospheric conditions encountered.

  When it comes to internal combustion engines,

  supplied, the "suction side" l must then be considered

  like that of the boost pump.

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Claims (9)

1. Device for transmitting the pressure prevailing on the suction side of an internal combustion engine to an automatic speed boot between the engine and a driven device, in a chamber. connected to the suction side of the motor and closed by a diaphragm, the movement of the diaphragm which is exerted in the chamber due to the pressure being transmitted to a switching pusher cooperating with the gearbox   and the speed changes of the speed boot being de- latched according to its position, characterized in that it comprises a power generator (22) whose force depends of atmospheric pressure and acts against a displacement   cementing of the push-button this switching (18) due to a modification   cation of atmospheric pressure.   2. Device according to claim 1, characterized in that the power generator (22) is supported by one side on the chamber (2) and on the other side on the membrane (4). 3. Device according to claim 2, characterized in that the distance separating the power generator (22) from the membrane (4) can be modified by means of a screw. adjustment (20).   4. Device according to claim 2-or 3, characterized in that a support (3.15) is fixed in the chamber (2), against which the power generator (22) is applied by one side, then that the other side of this power generator (22) is connected to the membrane (4), the power generator (22) shortening in the direction of transmission when   that there is an increase in atmospheric pressure.   5. Device according to claim 4, characterized in that the switching button (18) is securely connected gide to the membrane (4) via an element (12)   surrounding without touching the power generator (22).   6. Device according to one of claims 1 to 5,   characterized in that the power generator (22) is   consisting of a pressure capsule (22).   7. Device according to one of claims 1 to 6,   characterized in that the power generator comprises 2 48 5 1 4 0 at least one bellows (23).   8. Device according to claim 6 or 7, characterized in that a depression is established in the capsule (22) and in   what its elastic force is opposite to depression. 9. Device according to one of claims 1 to 8, ca-   characterized in that a change in the position of the membrane (4) due to a drop in pressure in the chamber   (2) opposes a spring (8) whose force can be adjusted.