DE2129694A1 - IMPROVEMENTS TO THE LUBRICATION DEVICE ON FLOATING COUPLINGS - Google Patents

Description

P 11-29

LAVABIA.-S.G.E.

Improvements to the safety devices for floating

Couplings

The invention relates to couplings that have two additional grooved have rotatable elements which are pushed together in a "floating" manner, i.e. in such a way that the transmission the torques from one to the other is made possible, but with the parts relative to one another small displacements in longitudinal directions and / or can experience tilting directions, in particular due to a slight mutual displacement of the rotating organs, each connected to one of the two coupling elements are or are engaged via them.

In particular, the invention relates to devices for lubricating the grooved elements that are mutually at the floating couplings act on each other.

In particular, it still relates - because in this case it seems the application to be most interesting - but not exclusively to those of these devices that are used to lubricate the

309000/0008

Grooved elements are used to support the rotors of To connect braking devices, in particular electrical braking devices of vehicles, these braking devices on the output shafts of the gearboxes of these vehicles are arranged or on the drive shafts of their axles, especially in the case in which the structure and the arrangement of said braking devices are of the type described in French patent no. 1493. have been described by the applicant.

' It is recalled that with the mentioned special version

it is difficult to get the moving documents inside and out correctly to lubricate because they are pushed on top of each other and are each part of an apron that is firmly connected to the rotor, and one Sleeve that is firmly connected to the shaft.

To ensure this lubrication, it has been suggested to use grease insert between the mentioned grooves, from one axial end by placing pressure grease in a chamber, into which these ends open, said chamber being arranged parallel to a normal lubrication circuit and relative to this has close connections, on the one hand a supply line for fresh grease and, on the other hand, a drain line for air bubbles and for excess grease.

Experience has shown that with such an arrangement and due to the level of pressure of the automatic lubricating devices grease escapes from the drain pipe at the lubrication stations, before the aforementioned chamber was filled with grease.

303808/0008

- 3 The lubrication obtained in this way is therefore insufficient.

Now, such insufficient lubrication leads to wear and tear and premature Destruction of the grooves, which leads to an interruption in transmission.

The invention has the particular purpose of eliminating this disadvantage and to ensure a complete filling with grease of the chamber into which the grooves extend and, accordingly, the Filling the space between the grooves.

The lubricating devices according to the invention also comprise a such a chamber into which the grooves extend axially, which is mounted in parallel on a normal lubrication circuit, and the devices are characterized in that the drain line is equipped with means that are suitable for draining the fat below the connection point of the said chamber with the said one Circuit to create a load loss, which is then automatic becomes high when the pressure of the grease is high or, conversely, low when the pressure of the grease is low.

The normal lubrication circuit preferably comprises an annular area which is used to lubricate a bearing, which in turn connected with two sealing rings: in this preferred case, the above-mentioned elastic loss is made in such a way stipulates that the maximum value corresponding to the maximum lubricating pressure is slightly below the maximum permissible pressure of the sealing rings before losses occur.

-4-309808 / 000Ö

2129634

The stress loss inducing agents are preferably in shape a constriction formed on the discharge line.

In a preferred embodiment, this constriction is partially through a cylindrical bore of small diameter in created a rigid pipe, the free end of which with a blow-off valve and the other end of which is connected to the discharge pipe of the device with a ring, the axis of which is rectangular to which the hole runs. Said ring is rotatably connected around an end portion of said tube, wherein radial grooves of small diameter - the desired additional constriction calibrating - and ring-shaped grooves are provided, in the mentioned section and in the mentioned Ring to create an offset connection between the pipe and the bore.

In the preferred embodiments, the inflow of the fat takes place into the chamber into which the grooves open, as well as the discharge from this chamber via a plurality of chimneys, preferably four, the immerse radially into said chamber from its lateral rotating wall.

The invention comprises, apart from the main devices some other arrangements, which are preferably used at the same time, and which are described in more detail below:

, Other features and advantages of the invention will become apparent from the j following description of an embodiment illustrated in the accompanying schematic drawings. Herein is:

309808/0008

Fig. 1 is an axial section of a floating coupling according to the invention Lubrication,

Fig. 2 is a partial cross section of this coupling according to II-II of Fig. 1, 3 shows a representation of a detail of the coupling mentioned, which is not visible in FIG. 1, and

FIGS. 4 and 5 are diagrams for facilitating understanding of FIG S chmie rm ο rm f o rm.

In the illustrated embodiment, it is assumed that that the invention is applied to the lubrication of a clutch, those between the rotor 1 of a Foucault's flow brake and the output shaft 2 of a transmission 3 of the vehicle is arranged.

The assembly and the overall structure of the brakeman correspond to the Description in the French patent mentioned above.

In other words, the stator 4 of the braking device comprises a Winding crown 5, which is arranged overhanging on the housing 6 of the transmission 4 via a bell-shaped structure 7, the rotor 1 of the type with double discs in an axial half-section has the shape of a two-tooth fork which comprises the stator crown, the two parallel disks 8 of this rotor in which the Foucault's view currents generated axially encompass said crown and are connected by means of cranked arms 9, which simultaneously act as cooling fins and as fan blades for a central plate

-6- 3 0 9808/0008

10, via rings 11 and bolts / nut systems 12.

The central part of the plate 10 is provided with a tubular skirt 13 connected, the free end of which has an inner groove 14.

This groove is to be pushed onto an additional outer case 15, which Part of a sleeve 16, which in turn is connected to the end of the shaft 2 by pushing on additional grooves 17 and axially blocking with the aid of an end plate 18, fastened by screws 19, firmly connected is.

The bell-shaped stator structure 7 has a central hub or nose 20, which extends axially to the plate 10 up to its immediate vicinity and thereby surrounds the skirt 13.

A bearing 21 is provided between the free end of this nose 20 and the skirt 13, this bearing centering the rotor in the stator.

The outer ring of this bearing is axially against the nose 20 by up " screws of a threaded ring 22 blocked in this nose, and the inner ring of said bearing is axially against the plate 10 by the

; Screwing on a threaded ring 23 pressed, being cylindrical ! Intermediate parts 24 and 25 places between them.

The bearing 21 is lubricated by lubricant, which is introduced into an annular region 26, and the seal becomes ensured by two seals 27 and 28 arranged axially on either side of the assembly 21,26.

-7-

309808/0008

The annular region 26 is connected on the one hand with a Supply line 29 for fresh lubricant and on the other hand with a drain line 30 (Fig. 3).

In the arrangement described, the stator is 4 or more precisely its bell-shaped structure 7 is connected to the housing 6 of the gearbox via bolts 31, which are located near the periphery and the centering of this housing is completed by the mutual action of two cylindrical seats at 32.

Because of possible inclination errors or position errors of the support surfaces and because of centering errors it is possible that the nose 20 is not exactly in line with the axis of the output shaft 2. Well will the position of this axis is determined by bearings, one of which is visible at 33, which guide them in the gearbox.

In addition, the presence of the bearings 21 and 33 allows easy axial movements of the parts (shaft 2 and skirt 13) that be caught.

It is therefore possible that the rotor 1, its skirt 13 at the same time is centered by its grooves on the end of the shaft 2 and by the bearing 21 on the end of the lug 20, which is in rotation with the rest the output parts of the transmission chain is connected, experiences certain displacements with respect to the said wave, its amplitude is low, and which extends both in the longitudinal direction and in the tilting direction extend around an axis perpendicular to the plane of the drawing.

-8th-

309808/0008

Accordingly, the additional grooves 14 and 15 can flow without interrupting the force slide easily on each other.

If the space between these grooves is not properly lubricated experience shows that it quickly becomes worn through wear and tear be destroyed, which interrupts the flow of power.

In order to ensure the lubrication of this space, the annular region 26 is brought into connection with the chamber 34, which W is delimited on the outside by a skirt 13 into which an axial end of the

named area opens.

This connection is established successively through radial openings (Fig. 1 and 2) and an annular groove 36, which are mounted in the cylindrical intermediate part 34 and by chimneys 37, which extend through the Apron 13 extend, and which extend radially into the interior of the chamber 34 to a depth ρ, which is preferably in the region of the inner radius this chamber moves.

The number of these chimneys is preferably more than 2, for example P four.

The axial end of the space between the grooves that is opposite to that which opens into the chamber 34 - which is axially closed, for example by a fitted metal capsule 38 - is through a Seal 39, in particular of toroidal shape, sealed.

Finally, the drain pipe 30 is equipped with devices that j are suitable for causing a high pressure loss in the lubricating flow when it is exposed to high pressure or in contrast

309808/0008

-9-

- 9 in addition, there is a slight pressure loss when the lubricant pressure is low.

These means preferably consist of a simple constriction, which can be designed in the form of an adjustable diaphragm, but which in the embodiment according to FIG. 3 consists of a series of passages with a small cross-section, with a cylindrical bore 40 of small diameter in the tube 41 is present.

This tube is via a crank with an end connection 42 of the tube 30 connected, which is clogged at its axial free end. This connection is ensured by a ring 43, which with a End of the tube is fixedly connected, the ring being mounted in a rotatable manner around said mouth, with radial openings 44 small Diameter and annular openings 45 are provided, in this mouth and in this ring, to the connection for the Produce grease between the line 30 and the bore 40.

The free end of the tube 41 is provided with a drain valve known per se 46 connected.

The rotatable arrangement of the tube 41 on the mouth 42 has the following Advantage: You can very easily attach the valve 46 to a place that is visible even after the brake has been installed, which makes it easier to lubricate the Petrol stations made easier.

The dimensions (diameter and length) of the bore 40 and the openings 44 are selected so that the pressure loss in these lines in the lubricant and corresponding to the maximum lubricant pressure is high, and in particular higher than the pressure in the connection 35, 36, 37 between the area 26 and the chamber 34, but lower

309808/0008 -io-

than the pressure necessary for the return of the seals 27 and 28 in case these are of the tip-over lip type.

The function of the lubrication device described is as follows:

For lubrication, which takes place when the vehicle is stationary (schematic shown in Fig. 4), fresh food is fed quickly, i.e. under high pressure Lubricant in line 29 a.

W This lubricant is immediately distributed in the easily accessible

Volumes, namely: area 26 and line 30.

Since the lubricant pressure is high, the constriction 40, 44 continues the Circulation counteracts a high resistance, which is considerably higher is than the necessary pressure for penetration into the spaces 35, 36, 37 and the chamber 34: this chamber is therefore completely filled, and only after it has been completely filled, if none at all Another way out remains, the fat passes through the constriction 40, 44 and thus overcomes the pressure loss caused by the constriction is effected and the lubricant exits valve 46.

This completes the lubrication.

Then when the vehicle is running, which causes shaft 2 to rotate, the lubricant is applied by rotating the rotor 1 and, accordingly, the chamber (FIG. 5) or by centrifugal force on the lateral cylindrical wall of said chamber, and that Lubricant is brought into the space between the grooves 14 and 15 due to the special shape.

-11-

309808/0008

2123694

Because the pressure then exerted on the lubricant by this centrifugal force is relatively small, the constriction 40, 44 is no longer a real obstacle to the flow, and the said lubricant flows progressively through chimneys 37, grooves 36 and 35, area 26, then pipe 30, passages 40, 44 and valve 46 (and not through the pipe 29, since this is provided with a check valve, which is not shown).

This drainage lasts until the radial lubricant level is in the chamber 34 reaches the chimney mouth 37.

The ring-shaped lubricant layer is given due to its viscosity with the strength jd (Fig. 1 and 5), which then remains in the chamber 34, too in the further course their ring shape and is sufficient to supply for a very long time the space between the grooves, which is called in these Layer extends at its radial peripheral level.

It goes without saying and also follows from the above, that the invention is in no way limited to the application and embodiments shown. Rather, it relates on all variants.

-12-

309808/0008

Claims (10)

- 12 patent claims: / 1 /)) Lubricating device for additional groove elements of a (V floating coupling, which are pushed onto each other in such a way that the torque transmission is possible, while the parts against each other undergo small longitudinal and / or tilting displacements of limited amplitude, a chamber being present into which these grooves open axially, this chamber being parallel mon - ψ is controlled, namely over relatively narrow passages on a lubrication circle, which has a supply line and a discharge line for the lubricant characterized in that means are also provided in connection with the discharge line (30), which are suitable when the lubricant drains below the lower connecting part of the chamber (34) with this line to create a pressure loss which is automatically high when the Lubricant pressure is high and, in contrast, low when the lubricant pressure is low. 2.) Device according to claim 1, characterized in that ) the pressure loss is set in such a way that the maximum value corresponding to the maximum lubricating pressure is higher than that, which is the drainage of the lubricant over the relative narrow passage (3 5, 36, 37], which the chamber with the lubrication circuit connect, oppose. 3.) Device according to claim 1 to 2, characterized in that the axial end of the grooves (14, 15J opposite to that which goes into the Chamber opens, is sealed by a seal (39). 4.) Device according to claim 1-3, characterized in that pressure loss creating devices from a constriction -13-303808 / 0008 2173694 - 13 exist in the drain line. 5.) Device according to claim 4, characterized in that the constriction partially through a cylindrical bore (40) of small diameter is created in the rigid pipe (41) which is connected to the lower end of the discharge pipe via a crank. 6.) Lubricating device according to claim 5, "characterized in that that the connection of the pipeline to the drainage line is ensured by a ring (43), the axis of which is perpendicular to that of the bore with the ring being rotatably mounted around an end portion (42) of said discharge conduit with radial flutes (44) small diameter and ring-shaped (45) are provided, in the said section and in the said ring, respectively, around the connection between the drain line and the bore. 7.) Device according to claim 1-6, characterized in that the lubrication circuit has an annular region (26), which for Lubrication of a bearing (21) is used, which in turn has two seals is connected, characterized in that the pressure loss is set in such a way that the maximum value corresponds to the maximum Lubricating pressure is slightly lower than the possible maximum pressure with complete tightness of the seals (27, 28). 8.) Device according to claim 1-7, characterized in that they ensure the flow of lubricant into the chamber as well as having a plurality of chimneys (37) for its removal from this chamber, which extend radially into this chamber, starting from its rotating wall at the side. 9.) Device according to claim 8, characterized in that, -14- 309808/0008 each chimney extends radially into the chamber to a depth that is somewhat is less than the length of the Iimenradius of this chamber. 10.) Device according to claim. 1 - 9, characterized in that it is used for the lubrication of groove elements which are used to connect the rotor (1) of an electric vehicle brake to the output shaft (2} of the transmission of this vehicle. 309808/0008 Blank page