FR2783368A1 - IMPROVED DEVICE FOR ELASTIC FIXING OF A RING ELECTRIC MOTOR, PARTICULARLY FOR A MOTOR VEHICLE - Google Patents

Abstract

A wall (4) defines three housings (7) which receive the front axial faces of damping elements (9), as well as a chamber (5) housing a motor (1) surrounded by a ring (17) with the interposition of said shock absorbing elements. The ring (17) comprises, facing the housings (7), three shaped openings adapted to the shape of the damping elements (9) to allow the passage of their front axial face. Each damping element (9) comprises a rear axial face (18) provided on two axial side edges with tangential projections (20) which force the rear axial face (18) to remain between the motor (1) and the ring (17).

Description

Improved elastic fixing device for an electric motor with

  The invention relates to the field of elastic fixing of electric motors surrounded by a ring, and in particular those

  which rotate a motor vehicle blower

  bile. It relates more particularly to fastening devices which comprise a housing comprising a wall delimiting, on the one hand, at least two housings capable of receiving axial faces before damping elements and, on the other hand, a chamber intended to house the motor surrounded

  of its ring with interposition of the damping elements.

  In certain known devices, such as in particular that described in Patent Application DE 94 22 144 U 1, the damping elements comprise, on the one hand, a front axial face provided with a projection intended to be housed in an opening of the part of the housing wall which delimits the corresponding housing, and on the other hand, a rear axial face comprising a housing which cooperates with a projection

  formed on the ring opposite the corresponding housing.

  Due to the strong vibrations of the engine, and

  dimensional variations of the different elements

  killing this type of device, the damping elements find it difficult to remain in their immobilized positions

once installed.

  The invention in particular aims to remedy the problem

set out above.

  To this end, it offers an elastic fixing device of the type defined in the introduction, in which, on the one hand, the ring comprises at selected places, intended to be placed respectively opposite each housing, at least two openings of suitable shapes to the shape of the damping elements to allow the passage of their front axial face, and on the other hand, each damping element comprises a rear axial face, opposite to the front axial face, and provided on each of its two axial lateral edges with projections transverse which constrain the axial face

  rear to remain appreciably between the engine and the ring.

  This ensures immobilization of the quality damping elements and above all durable, especially in the directions

radial and tangential.

  According to another characteristic of the invention, there is provided, on the one hand, on each of the two axial edges of the openings, in selected locations, at least one lateral projection of chosen shape, and on the other hand, on each of the two axial lateral faces of the damping elements, in selected locations, at least one housing of a shape adapted to that of the

  corresponding projection, for its housing.

  Such an arrangement makes it possible to further strengthen the fixed asset.

  tion, especially in the axial and tangential directions.

  Preferably, the housings which belong to different axial lateral faces as well as the projections which belong to different axial edges are not placed in identical positions, their number also being able to vary. Thus, the projections of the openings of the ring serve as polarizing means which prevent the

  shock absorbers are installed backwards.

  According to yet another characteristic of the invention, the openings and the damping elements have, in a

  view in axial transverse section, a general trapezoidal shape

  dale. Similarly, it is particularly advantageous that the damping elements have, in a view in radial transverse section, a generally trapezoidal shape, the more

  small dimension located at the front axial face.

  Each damping element of the device according to the invention can also have the following characteristics, taken separately or in combination: - at least one hole, blind or through, on each of its two axial lateral faces, substantially perpendicular to the front and rear axial faces, the hole extending along an axis substantially orthogonal to the axis of the engine; - At least one blind or through hole, on at least one of its two upper and lower transverse faces, substantially perpendicular to said front, rear and lateral axial faces, the hole extending along an axis substantially parallel to the axis of the motor;

  - a radial projection on its front axial face.

  Furthermore, the ring of the device according to the invention can

  be made of a plastic or metallic material.

  Depending on the material chosen, the openings can therefore be formed either directly by molding, or by cutting or puncturing. This ring may also include axial ribs

  on either side of the upper part of its openings

  res, which preferably extend above the

  openings. This protects the cross projections

  dirty shock absorbers when the engine is installed at

  the interior of the ring pre-equipped with said shock absorbers.

  This also makes it easier to introduce the motor

  in the chamber delimited by the ring.

  In the following description, given by way of example, we

  refers to the accompanying drawings, in which: - Figure 1 is a cross-sectional view of a fixing device according to the invention, all assembled, in a first embodiment; - Figure 2 is a front view of a ring opening of the device of Figure 1;

  - Figure 3 is a schematic perspective view illus-

  trant an embodiment of a damping element according to the invention suitable for being introduced into the opening of Figure 2; - Figure 4 is a top view of a fixing device according to the invention, partially assembled, in a second embodiment; - Figure 5 is a front view of a ring opening of the device of Figure 4; - Figure 6 is a sectional view along the axis VI-VI of Figure 5; - Figure 7 schematically illustrates, in a front view, a variant of the ring opening equipped with axial ribs; and - Figure 8 is a sectional view along the axis VIII-VIII of

Figure 7.

  First of all, reference is made to FIGS. 1 to 3 to describe a first embodiment of a fixing device.

according to the invention.

  The purpose of the fixing device illustrated in FIG. 1 is to house an electric motor 1 suitable for driving in rotation about an axis I-I the turbine 2 of a blower of a heating, ventilation and / or air conditioning installation.

  of a motor vehicle, for example.

  This device comprises a housing 3 comprising a wall 4 of generally cylindrical shape delimiting a chamber 5 of internal diameter greater than the diameter of the motor 1, and

  in particular of its cylinder head 6. This wall 4 delimits, also

  ment, three axial housings 7 (the axial arrangement being referenced with respect to the axis I-I of the motor 1) arranged substantially 120 from one another (in FIG. 1, only one of these three housings is shown). Well

  of course, more than three dwellings can be provided.

  In what follows, the faces will be called "front" or "rear" depending on whether they are respectively distant or close to the cylinder head 6 of the engine 1. Furthermore, the transverse faces will be those substantially perpendicular to the axis II . In addition, the qualifier "tangential" will designate a direction substantially perpendicular to a direction

  radial. Finally, the qualifiers "superior" and "inferior

  laughing ", respectively designate sensitive locations

  oriented towards the turbine 2 and towards the bottom 8 of the

housing 3.

  In order to immobilize the electric motor 1 inside the chamber 5, while absorbing its vibrations, damping elements 9 of the type shown in FIG. 3 are provided. Such elements are preferably made of

rubbery material.

  The damping elements are intended to be placed inside the chamber 4 at selected locations. Preferably, they are placed in an area defined by a plane substantially perpendicular to the axis I-I and containing

  the center of gravity of the engine / turbine assembly.

  The housings 7 delimited by the wall 4 of the housing 3 are intended to receive a part of these damping elements 7, and in particular their front face 10. The housings 7 are therefore formed in the wall 4 at the level of the zone defined by

  the plane substantially perpendicular to the axis I-I and contains

  the center of gravity of the engine / turbine assembly. In addition, to allow the implantation of the elements

  shock absorbers 9, the housings 7 have an upper face

  open 11, and a lower face 12 shaped so as to support part of the transverse face

  bottom 13 of the damping element 9.

  The front face 14 of the housing 7 has the function of blocking

  radially the damping element 9. It is therefore sensitive-

  ment in contact with the front face 10 of this element

shock absorber 9.

  In the example illustrated in FIGS. 1 and 3, the damping elements 9 preferably comprise, in the upper part of their front face 10, a projection 15 intended to be housed in an opening 16 in the front face 14 of the

housing 7.

  As indicated above, the purpose of the fixing device according to the invention is to maintain an electric motor 1. More specifically, it is intended to maintain an electric motor 1 provided with a ring 17. Such a ring 17 is generally set on the cylinder head 6 of the engine 1, in upper and lower parts, when it is made of a metallic material. It is clear that, when the ring is made of a synthetic material, for example a plastic material, the ring is not crimped on the

  motor but fixed with suitable fixing means.

  The damping elements according to the invention typically comprise a rear face 18, opposite the front face 10, and provided on its two axial lateral edges 19 with at least one tangential projection 20, substantially

  perpendicular to the lateral axial faces 21.

  Preferably, the rear face 18 of the damping element 9 only comprises, on each of its lateral axial edges 19, a single tangential projection 20 which extends over all

its height (axial direction).

  These tangential projections 20 have the function of blocking the damping element. They are, to do this, intended to be placed substantially between the cylinder head 6 of the engine 1 and the crimped ring 17, which comprises three openings 22

  of general shape adapted to the shape of the damped elements

  sors 9, seen in an axial cross section (or tangent

  tielle). These openings 22 can be made by

  cutting of the wall which constitutes the ring 17 when this

  this is metallic. When this ring is made of plastic, the openings are advantageously obtained during molding. Preferably, the damping element 9 has, in an axial (or tangential) cross section, a generally trapezoidal shape, the part of smaller dimension dl being placed at the level of the lower face 13, while the part of larger dimension d2 is placed on level

of the upper face 27.

  Likewise, it is particularly advantageous that the damping elements 9 have, in a radial transverse section, a generally trapezoidal shape, the smallest dimension d3 being placed at the level of the lower face 13, and the largest dimension d4 being placed at the level

of the upper face 27.

  These trapezoidal shapes in both directions sensitive-

  perpendicular to further improve the maintenance of the damping elements between the motor 1 and the

  front faces 14 of the housings 7 of the housing 3.

  Like the housings 7 of the housing 3, the openings 22 are formed in the area defined by the plane substantially perpendicular to the axis I-I and containing the center of gravity of the engine / turbine assembly, so

  to be opposite said housing of the housing.

  In the embodiment illustrated in FIGS. 1 and 2, the damping elements 9 are intended to be installed through the ring 17, before the latter is

  definitively set on the cylinder head 6 of engine 1.

  In other words, the ring 17 is partially crimped on the upper part of the cylinder head 6, then the damping elements 9 are introduced into the openings 22, their front faces 10 penetrating the first, until the tangential projections 20 come into contact with the wall of the ring 17 at the periphery of the opening 22. The lower parts of the ring 17 are then crimped onto the lower part of the cylinder head 6 of the engine 1, thus immobilizing the rear faces 18 of the three elements shock absorbers

  9 in the space contained between the cylinder head 6 and the ring 17.

  The damping elements 9 are thus immobilized

  radially, tangentially, and axially.

  In order to strengthen this immobilization of the damping elements 9, provision is made, on the one hand on the damping elements 9, at least one housing 23 on each lateral axial face 21 and, on the other hand on each axial edge 24 of each opening 22, at least one projection 25 of shape

  adapted to the shape of the corresponding housing 23.

  Preferably, at least two housings 23 and two are provided.

  projections 25 in selected locations which correspond.

  In the example illustrated in FIGS. 1 to 3, four housings 23 and four projections 24 have been provided on one of the axial lateral faces 23 and one of the axial edges 24, while on the opposite lateral axial face and the opposite axial edge three housings 23 and three projections 25 have been produced respectively. Thus, by not putting the same number of housings or projections on the opposite faces or the opposite edges, polarizing means are produced which prohibit an operator from installing a damping element in a position opposite to that which

is planned.

  Of course, the number of housing, and therefore of projection on each face or edge, may vary, provided that it is greater than or equal to 1. On the other hand, the respective positions of each housing and each projection may be different from one side to the other or from one edge to the other. Due to the presence of the projections 25 on the axial edges of the openings 22 of the ring 17, the damping elements 9 must be force-fitted through the

  openings 22. Such means (projection and housing) reinforce

  one hundred more immobilization of the damping elements 9. Furthermore, and as illustrated in FIG. 3, the damping elements 9 may have on their axial lateral faces 21 at least one hole 26, so

  to offer compensation zones for dimensional variations

  of damping elements 9 like housings 7 of the

housing 3.

  These holes 26 each extend along an axis substantially orthogonal to the axis I-I of the engine. They can be either blind or through. It is clear that in the latter case, the hole formed from one of the axial lateral faces 21 opens at a hole formed on the opposite axial lateral face 21. Several holes can thus be formed as required on each axial side faces 21, and blind holes can coexist

with through holes.

  Through holes have the advantage of reducing the amount of material of the damping elements, considered according to the sections containing said holes, and of increasing the power of absorption of vibrations in the directions

radial and tangential.

  Finally, it is also possible to provide, on the opposite upper 27 and lower 13 faces of the damping elements 9, at least one hole 28. This or these holes each extend

  along an axis substantially parallel to the axis I-I of the engine.

  They can be either blind or through. These

  holes also have the function of compensating for varia-

  dimensional, especially axial and radial.

  Blind holes may be formed in conjunction with through holes. Through holes have

  the advantage of absorbing vibra-

  axial positions generated by the motor.

  In the immobilized position, the upper face 27 of each damping element 9 is held under stress by an annular wall 33 of the support, which wall

  extends perpendicular to the axis I-I of the engine.

  Reference is now made to FIGS. 4 to 6 to describe a second embodiment of a fixing device according to the invention. The aim of such a device is also to maintain an electric motor on which a ring 17 is crimped (or more generally fixed). What differentiates this second embodiment from the first is mainly the embodiment of the openings 22 formed in the ring 17. Here, rather than making the opening 22 by cutting the wall which constitutes the ring 17, the opening 22 is produced by puncturing this same wall, as

illustrated in figure 6.

  The opening 22 is thus carried by a lug 29 integral with the wall constituting the ring 17, and slightly in front of the latter. The solidarity is made, of

  preferably at an end part 30 of the upper part

  of the wall defining the ring 17.

  Thanks to this embodiment, it is no longer necessary to install the damping elements 9 before the ring

  17 is not crimped on the cylinder head 6 of the electric motor 1.

  Indeed, it is now sufficient to slightly raise the tab 29, then to pass through the damping element 9 in the opening 22, the front face 10 of this damping element

  penetrating first, until the projections tangen-

  20 of said damping element come into contact with the axial lateral edges 31 which delimit the edges

axial 24 of the opening 22.

  Then there is only to fold the tab 29 in the direction of the ring 17, and therefore of the motor. The damping elements 9 are then substantially blocked between the cylinder head 6 of the engine 1 and the ring 17, since the tab 29 constitutes a part of this ring 17.

  In this embodiment, it is certain that the immovable

  radial position of the damping elements is obtained by the front face 14 of the housing 7 of the housing 3 as well as by the presence of the cylinder head 6 of the engine and the axial edges 24 of

the opening 22 of the ring 17.

  The same type of damping element 9 as that described with reference to FIG. 3 can be used for this mode of

  production. The same applies to the shape of the opening 22.

  We now refer to Figures 7 and 8 to describe a

  ring variant fitted with axial ribs 32.

  This variant is more particularly suited to cases in which the motor is introduced inside the ring 17, after having placed the damping elements 9 in

the openings 22 of said ring.

  In this situation, when the motor is introduced inside the chamber delimited by the ring, said motor can be blocked (or at least hampered) by the tangential projections 20 of the damping elements 9. This risks partially rolling up the projections 20, and consequently to prohibit the damping elements from fulfilling their role

effectively.

  According to the invention, to remedy this drawback, there are provided in the upper part of each opening, on either side thereof, axial ribs 32 oriented towards the interior of the chamber which receives the

  engine. More precisely, these ribs are formed sensi-

  completely parallel to the direction I-I, and at a distance from the axial edges 24 of the opening 22 substantially equal to the width of the tangential projections 20 of the elements

shock absorbers 9.

  In addition, it is preferable that these axial ribs 32 extend upwards beyond the openings, as illustrated in FIGS. 7 and 8. This makes it possible to guide the motor inside the ring 17 before it reach

the damping elements 9.

  These axial ribs 32 can be produced by bossing

  when the ring is metallic or by molding during-

that it is made of plastic.

  These ribs can be used in the two embodiments described with reference to Figures 1 to 6, but it is more particularly suitable for the embodiment

  described with reference to Figures 1 to 3.

  The invention is not limited to the embodiments described above. It encompasses all the variants that a person skilled in the art may develop within the framework of

claims below.

  Thus, the shapes of the housing of the housing, and therefore

  that those of the damping elements and the openings of the ring, may be significantly different from those

illustrated in the figures.

  Similarly, the number of housings and the number of holes, through or blind, axial or tangential, of the damping elements, may be significantly different from those

illustrated in the figures.

Claims (18)

Claims   1. Elastic fixing device of an electric motor   that, of the type comprising a housing (3) comprising a wall (4) delimiting, on the one hand, at least two housings (7) suitable for receiving front axial faces (10) of damping elements (9) and, d 'other hand, a chamber (5) intended to accommodate a motor (1) of axis (II), surrounded by a ring (17) with interposition of said damping elements, characterized in that said ring (17) comprises in selected places, intended to be placed respectively opposite said housings (7), at least two openings (22) of shapes adapted to the shape of said damping elements (9) to allow the passage of their front axial face (10), and that each damping element comprises a rear axial face (18) opposite the front axial face and provided on each of two axial lateral edges (19) with at least one tangential projection (20) suitable for constraining said rear axial face (18 ) to remain substantially   between said motor (1) and said ring (17).   2. Device according to claim 1, characterized in that the wall (4) delimits three housings (7) and in that   the ring (17) comprises three openings (22).   3. - Device according to one of claims 1 and 2,   characterized in that each opening (22) has on each of its two axial edges (24), in selected locations, at least one lateral projection (25) of chosen shape, and in that each damping element (9) has on each of its two axial lateral faces (21), in selected locations, at least one housing (23) of shape adapted to that of the corresponding projection (25) in view of his accommodation.   4. Device according to claim 3, characterized in that the housings (23) belonging to different axial lateral faces (21) and the projections (25) belonging to different axial edges (24) are not placed in identical positions.   5. Device according to one of claims 3 and 4,   characterized in that the number of housings (23) and projections (25), belonging respectively to one of the axial lateral faces (21) and to the corresponding axial edge (24),   is different from the number of housings and protrusions   the axial side faces respectively and at the corresponding axial edge.   6. Device according to one of claims 1 to 5,   characterized in that said openings (22) and said damping elements (9) have, in a section   transverse axial, a general trapezoidal shape.   7. Device according to one of claims 1 to 6,   characterized in that said damping elements (9) have, in a radial cross section, a generally trapezoidal shape, the part of smaller dimension   (dl) being formed at the front axial face (10).   8. Device according to one of claims 1 to 7,   characterized in that each damping element (9) comprises at least one hole (26) on each of its two faces   lateral axial (21), which are substantially perpetual   dicular to said front (10) and rear (18) axial faces, the hole (26) extending along an axis substantially   orthogonal to the axis (I-I) of the motor (1).   9. Device according to one of claims 1 to 8,   characterized in that each damping element (9) comprises at least one hole (28) on at least one of its two upper (27) and lower (13) transverse faces, which are substantially perpendicular to said front axial faces (10) , rear (18) and lateral (21), the hole (28) extending along an axis substantially parallel to the axis (I-I) of the motor (1).   10. Device according to one of claims 8 and 9,   characterized in that said holes (26, 28) are blind.   11. Device according to one of claims 8 and 9,   characterized in that said holes (26, 28) are traversed   sants and join opposite sides.   12. Device according to one of claims 8 to 10,   characterized in that at least one hole (26, 28) located on one side (21) communicates with another hole located on the opposite side.   13. Device according to one of claims 1 to 12,   characterized in that the front axial face (10) of the elements   shock absorbers (9) includes a radial projection (15).   14. Device according to one of claims 1 to 13,   characterized in that each opening (22) is made by   cutting of the wall constituting the ring (17).   15. Device according to one of claims 1 to 13,   characterized in that each opening (22) is produced by puncturing the wall constituting the ring (17), said openings (22) being carried by a lug (29) integral with the wall constituting the ring (17) and slightly forward of it.   16. Device according to one of claims 1 to 13,   characterized in that the ring (17) is produced by   molding, in particular in a plastic material.   17. Device according to one of claims 1 to 16,   characterized in that the ring (17) comprises, on either side of the upper part of each opening (22) and at a selected distance from its axial edges (24), axial ribs (32), which extend above said openings.   18. Device according to claim 17, characterized in that said axial ribs (32) extend beyond said openings (22).