FR2813358A1 - Butterfly mounting for motor vehicle internal combustion engine intake tube has butter fly shaft mounted in sleeve with plastic extrusion forming operating lever - Google Patents

Abstract

The butterfly mounting for a motor vehicle internal combustion engine inlet tube (3) has a shaft (16) receiving the valve for translation or rotation. the butterfly shaft is mounted in a bearing sleeve (34) and is connected to a rotation lever (14,19) formed by a plastic extrusion. Between the shaft and bearing is a sealed space dependent on the adjustment of the valve. The bearing can have lugs (23,29) to fit onto the seat (25) surface.

Description

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Technical Field The present invention relates to a bearing seal device for mounting a first part in a second part, a shaft-shaped part receiving the first part, in translation or in rotation relative to the second part and whose the first part comprises a bearing element.

To seal through passages whether they are rotational or translational passages, solutions are used which separate the sealing elements and those forming the bearings. As bearing elements, use is mainly made of plain bearings, bearings coated with plastic or metallic bearings (CuSn, CuZn), parts produced with a lathe as well as sintered parts). The sealing function is provided by a rubber element such as an O-ring, a shaft seal or a specially shaped rubber part.

 State of the art Document DE 195 10 622 A1 relates to a throttling device and to a method of manufacturing such a device. According to this document, a bearing is installed which is fixed axially relative to the throttle shaft, but which can rotate relative to this shaft. The throttle shaft can then be tightened with the bearing in a bearing cavity of the throttle flap housing. This throttling device is particularly suitable for vehicles having an internal combustion engine with throttling.

Document DE 33 46 167 A1 relates to a nozzle for the throttle flap. In the case of this endpiece for a throttle flap, there is a throttle flap (butterfly) mounted on a shaft, the two ends of which are housed in the plain bearings of a support housing. These plain bearings are respectively pressed into a shaft bore and have front surfaces on the side of the throttle flap. These parts are curved along the wall of the bore of the housing and form part of this wall. This shape of the plain bearings makes the leaks at the setting of the throttle flap extremely low.

A bearing sealing device is also known which is made up of an extremely reduced number of parts which are simple to manufacture and which allows a guaranteed, reliable and leaktight assembly both from the point of view of sealing and of the bearing. In this proposed sealing and bearing device, the bearing element has a bearing zone and a zone

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 sealing, and this is prestressed to ensure sealing by a sealing element-clamping element against a sealing surface.

The bearing sealing device is used in particular in motor vehicles in places where medium stresses are encountered.

SUMMARY OF THE INVENTION The purpose of the present invention is to remedy the known drawbacks and solutions and relates to a bearing sealing device of the type defined above, characterized in that the tree-shaped part integrates by extrusion a device rotation lever and between the through hole of the bearing element and the end area of the shaft-shaped part, there is a sealing gap depending on the fit.

The solution according to the invention above all offers the advantages of a considerably simpler assembly, which results in a sequence of assembly operations of less complexity. It eliminates the separate parts required in current bearing sealing devices for shafts movable in translation and in rotation because the sealing effect is obtained by a narrow interval. By an appropriate choice of the material of the bearing bushing lining in the regulating butterfly housing, its machining precision and thus the sealing effect to be achieved can be adapted to the adjustment of the bearing bushing and throttle shaft or pressure level. It does not matter under these conditions that the butterfly shaft moves in rotation or in translation.

The solution according to the invention of a bearing insert which engages in a borehole and the outer surface of which forms the seat surface has projections which form a connection, makes it possible to integrate the bearing element and the butterfly tree in a set. This contributes to a considerable reduction in assembly work. The separate treatment of shaft seals, including assembly tools such as the spacer, as well as the storage of these parts, the external face of which is coated with PTFE, can be completely eliminated. The solution of the invention makes it possible to integrate a butterfly shaft provided with an extruded part as a complete assembly in the throttle valve housing.

According to an advantageous development of the invention, the assembly comprising the element with rotation lever is generally produced as a shaft and bearing bushing. The rotation lever which transforms an axial movement of a pressure gauge pusher into

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 a rotary movement with an eccentric lever pivot is fixed during extrusion on a butterfly shaft, for example made of stainless steel, with a blocking in rotation relative to the shaft as well as a blocking in translation. This blocking of the rotation lever produced as an extruded part can be done by cross-pieces, a transverse drilling with a pin or a flat part of one of the parts at the level of the adjustment.

The manufacture of the rotation lever including the pivot as an extruded part is particularly simple and makes it possible to manufacture a set of several parts according to a high level of integration, in a simple and inexpensive manner, since the separate fixing elements in rotation such as that nuts, lock washers, saw rings or the like are now removed.

Drawings The present invention will be described below in more detail with the aid of the appended drawings, in which - FIGS. 1 and 2 show an embodiment of a throttle valve with butterfly shafts movable in translation and in rotation with shaft and bearing assemblies in several pieces according to the known technique, - Figure 3 shows a passage section of an intake manifold in the housing with the control butterfly tilted in the open position, - the Figure 4 is an enlarged view of the shaft device and sealing insert according to the invention, - Figure 5 shows the shaft device and bearing insert received in the wall of the manifold intake, - Figures 6a, 6b, 6c show butterfly shaft devices, the bearing and the rotation lever made in the form of an extruded composite part.

Description of embodiments Figures 1 and 2 show embodiments of butterflies whose shaft is movable in translation / rotation, installed in bearing bearings hitherto coated with PTFE or with bearings surrounding them as particular parts. , with a special sealing element.

Figure 1 shows a throttle body 2 crossed by an intake tube 3. Crosswise to the flow section 20 of the intake tube 3, there are two valve stems 11/16 one behind

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 the other. The throttle rod bearing the reference 11 represents a rod movable in translation in the double direction of the axis 12; this rod can be moved perpendicular to the direction of flow in the intake tube 3 by a pressure box 13. The throttle rod 11 sliding in the direction of translation, is provided with a plate which closes or releases a seat of valve 10 received by the side wall 4 of the intake tube 3 as a function of the axial stroke 12 of the rod 11. The throttle rod 11 movable in the direction of translation relative to the flow section 20 in the tube d In addition, it carries guide surfaces 9 which influence the flow of the fluid passing through the free flow section 20 of the intake tube 3.

The external side of the intake tube 20 shown in FIG. 1 has an external thread 5 as well as a seal 8 installed behind the external thread 5. The external thread 5 makes it possible to connect a pipe to the intake tube 3 and thus to the valve housing 2, for example the intake pipe of an internal combustion engine.

The pressure box 13 represented by a half-section, displaces the valve stem 11 in the direction of the double arrow 12. For this, the wall 4 of the intake tube comprises a bearing 6, coated in which is inserted a complementary part made up by a shaft seal 7. The valve stem 11 with the pressure box 13 or a membrane of the pressure box 13 are connected by a snap connection.

The segment of the intake tube 3 located downstream comprises a butterfly shaft 16 movable in rotation which receives by a butterfly support, a butterfly-shaped regulating element 1, circular or elliptical. The outer periphery of the butterfly-shaped regulating element 1 can be both exactly circular or have an elliptical outline 22. At the bearing point 21, the axis of the butterfly 16 is received in the side wall of the tube valve 3 while the opposite end of the shaft 16 of the butterfly is rotatably mounted with a nozzle also in the wall 4 of the intake tube 3. At the end opposite the bearing point 21 of l butterfly shaft 16, this is provided with a rotation lever 14. Between the rotation lever 14 and the interior wall 4 of the intake tube 3, there is a stud provided in addition with a closed casing 18 as well as a shaft seal 7 applied against this lateral surface. A pressure box bearing the reference 17 receives, in a non-detailed manner in FIG. 1, a rotation pivot 19 in an eccentric position relative to the axis of rotation of the rotary lever 14 to transform the

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 axial movement of the vacuum box 17 in a rotary movement of the shaft 16. FIG. 2 also shows a section of the butterfly housing 2, according to a different cutting plane than that of FIG. 1. In this configuration according to the state of the art, the passage section 20 in the intake tube 3 is adjustable by a flap (butterfly) 1, pivotally mounted. The butterfly 1 is pivotally mounted in two opposite bearings and with its outer contour 22, it forms to a very large extent an interval with the inner wall 4 of the tube 3. The butterfly 1 has stiffening ribs and the part 16 in the form of the axis is surrounded by a sleeve 18 at the level of the rotation lever 14 with also a shaft seal 7. The configuration of FIG. 2 shows the pivot 19 installed eccentrically on the rotation lever 14. The pivot 19 is surrounded by a pusher connected to a pressure gauge box, encapsulated, provided externally on the housing 2 of the butterfly. By applying pressure or vacuum to the pressure box 17, the pusher, the lower end of which surrounds the pivot joint 19 in the manner of a cap, produces an upward and downward movement transformed by the joint 14 carried eccentrically by the rotation lever 14 in a rotational movement of the shaft 16 of the butterfly around its axis. This acts on the adjusting butterfly 1, connected integrally to the support 15 of the shaft 16 to modify the angular position and influence the passage section 20 in the intake manifold 3 to free the passage completely or partially or completely close the passage section 20.

The representation in FIG. 3 shows more clearly the housing 2 of the throttle valve, the outer side of which is provided with the manometric box 17, the outer contour of which appears.

The throttle body 1 can be fixed to the internal combustion engine by new holes, by flanges; in FIG. 3, it is shown with the regulating butterfly 1 turned in the open position releasing the maximum passage section 20 of the suction pipe 3. The regulating butterfly 1 is pivotally held by a shaped part shaft and mounting can be stiffened by ribs 32. Figure 4 shows the detail of the sealing bearing device according to the invention.

Figure 4 shows a detail on an enlarged scale of the area of the wall 4 of the intake manifold 3. The wall 4 of the intake manifold 3 has a seat surface 25, shaped into

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 denies of a through hole. The seat surface 25 of the through hole receives a bearing element 24, the upper side of which is provided with a front surface 30; at its mounting surface, this part has an insertion leave 29. The bearing element 24 is provided with a through bore 26 housing a tip of the part 16 configured in the form of a shaft. At the outer periphery of the bearing element 24, in its axial direction, there are projecting portions 23 of annular shape, spaced from one another. The protrusions 23 may annularly surround the entire outer periphery of the bearing element 24; these projecting parts can also have a hook-shaped contour which allows a connection by form with the internal surface of the through hole provided in the seat surface 25. The projecting parts 23 produced in the bearing element 24 make it possible to mount this part by a shape connection in the inner surface of its seat surface 25. Thus its front surface 30 is opposite a rotation lever element 14 also extruded on the shaft-shaped element 16.

FIG. 4 also shows that the end piece of the tree-shaped part 16 which passes through the bearing element 24 becomes, at the level of the internal wall 4 of the suction pipe 3, the adjusting butterfly 1 which adjusts the passage section 20 in the intake manifold 3 and the peripheral surface of which bears the reference 22.

According to an advantageous embodiment of the invention for the bearing element 24 receiving the tree-shaped part 16, this part 16 can be made of stainless steel while the bearing element 24 shown on an enlarged scale in FIG. 4 can be made of brass. The choice of materials used determines to a large extent the precision of the machining and thus the seal that can be obtained thanks to a narrow gap between the components rotating relative to each other.

In the present exemplary embodiment according to FIG. 4, for a bearing diameter of 3 mm from the end piece of the part 16 in the form of a shaft and thus a diameter of 3 mm from the through hole in the bearing element 24 in brass, you can have a set of bearings between 0.01 mm and 0.03 mm. For a pressure difference of 1 bar between the internal side of the tubular wall 4 and the connection side of the magnetic box 17, there will be for this sealing interval, a volume flow loss of 0.5 t / min, in the% y hypothesis where, as indicated, the pressure difference is equal to only 1 bar. The choice of materials for the bearing element 24 and the shaft 16 of the butterfly can be modified

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 in a very wide range; the choice determines the precision of the machining due to the two materials, to a very large extent for the possible configuration and reduction of the sealing interval and thus the quality of the sealing effect achieved in this way.

The view of Figure 5 shows the mounting configuration of the butterfly shaft 16 according to the invention with the bearing element 24 formed thereon and the rotation device 14, 19 extruded thereon.

The throttle shaft 16 is housed on one side in the bearing 21 in the wall 4 of the suction pipe 3 while in the opposite side of the wall 4 of the suction pipe 3, there is an extension 33 in which is integrated a bearing element 24 (to be compared with the view in FIG. 4).

Adjacent to the front surface 30 of the brass bearing insert 24, a rotation lever 14 has been extruded on the shaft 16 of the butterfly; this lever can for example be produced by extruding plastic material on the shaft 16 of the butterfly. This lever can advantageously comprise a pivot pivot 19 eccentric with respect to the axis of rotation of the rotary lever 14, this pivot being extruded and as shown in FIG. 2, it can be connected by a pusher to a pressure box 17, 13 .

For locking in rotation of the pivoting lever 14 at the peripheral surface of the butterfly shaft 16, for example made of stainless steel and carrying the regulating butterfly 1, a flat is provided between the rotation lever 14 and the shaft 16, a through hole with a pin or other means of locking in rotation, avoiding both the axial sliding of the pivot 19 of the rotation lever or its rotation relative to the shaft 16 about its axis of rotation.

According to the view of Figures 6a, 6b, 6c, there is a possibility of preferential embodiment of the assembly forming the shaft 16 according to the invention. The shaft 16 can be provided at its free passage section, with a multi-faceted profile 31 which can either be a four-faceted bearing profile, or six facets, as shown in FIG. 6a; in theory, any other rotation blocking profile is possible.

The end of the butterfly shaft 16 opposite the pressure box 13, 17 respectively, has a narrowed end piece surrounded by the bearing element 24 and the outer contour of which forms a few projections 23 spaced apart in the axial direction for a connection by form. The protruding parts 23 which form the connection in the wall 4 at the level of the seat surface 25 can be rings or

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 protruding parts 23 in the form of hooks, ensuring the mounting of the bearing element 24 integrally rotated in the seat surface 25 of the wall 4 of the intake manifold 3. Opposite the front face 30 of the bearing element 24, for example made of brass, there is an extruded part 27 fixed to the end piece with the reduced section of the shaft 16 of the butterfly. The extruded part can preferably be produced by plastic extrusion, and its mounting integrally in rotation and locked in the axial direction on the reduced section element of the shaft 16 of the butterfly is ensured by a flat not detailed here, a through hole, a transverse hole, a pin or the like. The plastic part 27 which constitutes the rotation lever 14 shown in the previous figures, is provided at its front surface with a pivot 19 actuated from the pressure gauge. According to the view of FIGS. 6a and 6c, the part 16 constituting the throttle shaft is an integrated part formed from three sub-assemblies, namely the throttle shaft made of stainless steel, the bearing element 24 carried by the part and creating the sealing effect and the adjacent rotary lever part 14, extruded on the shaft.

Thus when mounting the throttle body, the preassembly of the throttle shaft 16 on the housing 2 is eliminated, since this completely preassembled assembly engages in the bearing 21 of the housing 2 and in its seat surface 25 by being directly mounted. The rotary lever device 14 manufactured as a plastic part 27 can advantageously be provided with cavities 34 directed radially relative to the axial extension of the shaft 16 of the butterfly. The cavity 28 allows a limited deformation of the rotation lever produced as an extruded plastic part forming the rotation lever whose front surface eccentrically carries the rotation pivot 19.

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 NOMENCLATURE 1 Control throttle 2 throttle body 3 intake manifold 4 intake manifold wall 5 threaded extension 6 coated bearing 7 shaft seal 8 seal 9 guide surface 10 seal seat 11 stem translation 12 axial stroke 13 rotation axis 14 rotation lever 15 throttle support 16 throttle shaft 17 pressure box 18 sleeve 19 rotation pivot 20 free passage section 21 shaft bearing 22 periphery 23 projecting part 24 bearing bush 25 surface forming seat 26 through hole 27 piece of extruded plastic 28 cavity 29 mounting leave 30 front surface 31 surface forming throttle seat 32 ribs 33 extension 34 cavity.

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Claims (8)

CLAIMS) The bearing sealing device for mounting a first part (1, 16) in a second part (3), a part (16) in the shape of a tree receiving the first part (1), in translation or rotation relative to the second part (3) and the first part (1, 16) comprises a bearing element (24), characterized in that the part (16) in the form of a shaft integrates by extrusion, a rotation lever device (14, 19) and between the through bore (26) of the bearing element (24) and the end region of the tree-shaped part (16), there is an interval d 'tightness dependent on the fit. 2) A bearing sealing device according to claim 1, characterized in that the rotation lever device (14, 19) is produced by extruding plastic material on the shaft-shaped part (1, 16). 3) A bearing sealing device according to claim 1, characterized in that the bearing element (24) is provided with projecting parts (23, 29) allowing a connection by shape with a seat surface (25) . 4) A bearing sealing device according to claim 3, characterized in that the projecting parts (23) are annular bosses provided on the bearing element (24). 5) A bearing sealing device according to claim 3, characterized in that the projecting parts (23) have a hook shape. 6) A bearing sealing device according to claim 3, characterized in that the rotation lever device (14, 19) is mounted by a form connection on the shaft-shaped part (16).  7) A bearing sealing device according to claim 6, characterized in that <Desc / Clms Page number 11>  the rotation lever device (14, 19) is fixed to the tree-shaped part (16) by cross-braced edges, transverse bores or flats. 8) A bearing sealing device according to claim 1, characterized in that the tree-shaped part (16) is made of stainless steel and the bearing element (24) of brass.