FR2795812A1 - IMPROVED ARRANGEMENT OF A FAN MOTOR ON A HEAT EXCHANGER AND FRONT BLOCK FOR A MOTOR VEHICLE PROVIDED WITH THIS ARRANGEMENT - Google Patents

Abstract

The heat exchanger (12) comprises a body (22) provided with cooling fins carried by tubes (26) for circulating a heat transfer fluid. The body (22) extends between two coolant fluid manifolds interconnected by the tubes (26). The motor (14) is fixed on a support (32) comprising at least one part (32A) of material overmolded on the body (22). Preferably, the motor (14) is fixed to the support (32) by means of at least one screw (34), in particular self-tapping, screwed into this support. Also preferably, the overmolded material is plastic.

Description

The present invention relates to an improved arrangement of a motor

  fan on a heat exchanger and a front unit for a motor vehicle provided

of this arrangement.

  There is already known in the prior art an arrangement of a fan motor on a heat exchanger comprising a body provided with cooling fins carried by tubes for circulation of a heat transfer fluid, this body extending between two manifolds for heat transfer fluid connected together by the tubes. An arrangement of this type is described for example in FR-A-2 748 559. In this document, the fan motor is fixed to the body of the exchanger by means of arms hooked in particular on the edges of this body. However, we see that these arms of

  fixation tend to create aero-acoustic disturbances.

  The object of the invention is to avoid these aero-acoustic disturbances, while minimizing the weight and the cost of the means used to mount a fan motor.

on a heat exchanger.

  To this end, the subject of the invention is an arrangement of a fan motor on a heat exchanger, of the aforementioned type, characterized in that the motor is fixed on

  a support comprising at least one part of material overmolded on the body.

  According to other characteristics of this arrangement: - the support comprises a first connecting part with the body, in

  elastomer, and a second connecting part with the motor in plastic material

  molded with the first part; - the overmolded material is plastic; the motor is fixed to the support by means of at least one screw, preferably self-tapping, screwed into this support; - The motor comprises at least one fixing lug forming a passing seat for the screw; - The support is provided with at least one engine fixing finger, the screw being

  screwed into an axial hole made in this finger.

  The invention also relates to a front unit for a motor vehicle

  characterized in that it comprises an arrangement as defined above.

  The invention will be better understood on reading the description which follows

  given only by way of example and made with reference to the drawings in which: - Figure I is a perspective view of a heat exchanger on which is arranged, according to the invention, a fan motor; - Figure 2 is a sectional view of the heat exchanger, along the plane 2- 2 of Figure 1, showing in more detail the fan motor fixed on the

body of the heat exchanger.

  FIG. 1 shows a front unit 10 of a motor vehicle provided with a heat exchanger 12 and a fan 13. This fan 13 comprises an electric motor 14 for driving a conventional propeller 16 provided with a bowl 18 and a series of blades 20 of which only one is shown in Figure 2. The propeller 16, which is not shown in Figure I for reasons of clarity, is mounted in a manner known per se

on the motor shaft 14.

  The heat exchanger comprises a body 22 provided with cooling fins 24 carried by a bundle of tubes 26 for circulation of a heat transfer fluid. The body 22 extends between two collecting boxes of heat transfer fluid, lower 28 and upper 30. These boxes 28, 30 are interconnected by the tubes 26

  which extend substantially vertically.

  The fins 24 are for example flat and crossed by the tubes 26.

  The body 22 has a generally substantially flattened parallelepiped shape defining large opposite parallel faces that are substantially vertical. Motor 14 is

  fixed to one of these two large faces of the body 22 as will be described below.

  The motor 14 is fixed on a support 32 comprising at least one part of overmolded material on the body 22. Preferably, the overmolded material is plastic of the thermosetting or thermoplastic type. Overmolding is carried out by a known method, for example by injection or compression of the plastic material so that the fins 24 and the tubes 26 are at least partially embedded in the plastic material. Preferably, the support 32 comprises a first part 32A for connection with the body 22, made of elastomer, and a second part 32B for connection with the motor 14

  in plastic material co-molded with the first part 32A.

  The first part 32A of the support, endowed with rubber elasticity, makes it possible to absorb the vibrations of the motor 14 to prevent their propagation in the body 22 of

the heat exchanger.

  The motor 14 is fixed to the support 32 by means of at least one screw, preferably self-tapping, screwed into this support 32. In the example described, the motor 14

  is fixed to the support 32 by means of three self-tapping screws 34.

  The screws 34 are carried by three fixing lugs 36 each forming a seat passing for the corresponding screw 34. These lugs 36 are integral with the outline

  external of a housing 38 of the engine 14 of generally cylindrical shape.

  The second part 32B of the support is provided with three fixing fingers 40 associated with the three screws 34. Each screw 34 is screwed into an axial blind hole 42 formed

in the corresponding finger 40.

  It will be noted that, unlike the first part 32A, the second part 32B of the support is not endowed with rubber elasticity but is adapted to ensure a

  solid connection between support 32 and screws 34.

  The invention is not limited to the embodiment described above. In particular, the overmolded material is not necessarily plastic and may be in

  variant of aluminum or an aluminum-based alloy.

  Among the advantages of the invention, it will be noted that it makes it possible to fix the fan motor on the body of the heat exchanger with fixing means

  simple, light and inexpensive, these fastening means minimizing aero disturbances

acoustic.

Claims (7)

  1. Arrangement of a fan motor (14) on a heat exchanger (12) comprising a body (22) provided with cooling fins (24) carried by tubes (26) for circulation of a heat transfer fluid, this body (22) extending between two manifolds (28, 30) of heat transfer fluid connected together by the tubes (26), characterized in that the motor (14) is fixed on a support (32) comprising at least a part   (32A) in molded material on the body (22).   2. Arrangement according to claim 1, characterized in that the support (32) comprises a first part (32A) connecting with the body (22), made of elastomer, and a second part (32B) connecting with the motor (14 ) made of plastic molded with the first part (32A).   3. Arrangement according to claim 1 or 2, characterized in that the material overmolded is plastic.   4. Arrangement according to any one of claims I to 3, characterized in   that the motor (14) is fixed to the support (32) by means of at least one screw (34),   preferably self-tapping, screwed into this support.   5. Arrangement according to claim 4, characterized in that the motor (14)   comprises at least one fixing lug (36) forming a passing seat for the screw (34).   6. Arrangement according to claim 4 or 5, characterized in that the support (32) is provided with at least one finger (40) for fixing the motor (14), the screw being screwed in   an axial hole (42) formed in this finger (40).   7. Front unit for a motor vehicle, characterized in that it comprises a   arrangement according to any one of the preceding claims.