FR2793737A1 - HEATING AND / OR AIR CONDITIONING DEVICE OF A MOTOR VEHICLE COMPRISING A REMOVABLE MOTOR-FAN GROUP - Google Patents

Abstract

A heating and / or air conditioning device suitable for being installed at least in part in the dashboard (10) of a motor vehicle, comprises a motor-fan unit (14) having a housing (16) housing a driven turbine. by a motor (18) for the suction of an air flow. The housing (16) of the motor-fan unit (14) comprises a removable part (26) suitable for being separated from a fixed part (24) of the housing and located near a wall (36) of the dashboard (10), which allows access to the turbine and the motor (18) after dismantling at least part of the dashboard (10).

Description

Motor vehicle heating and / or air conditioning device

  comprising a removable motor-fan unit The invention relates to the heating and / or air conditioning devices of motor vehicles, and more precisely

  to the sub-assembly called "motor-fan group" or "pul-

  "incorporated in these devices.

  It relates more particularly to a heating device

  fage and / or air conditioning suitable for being installed at least in

  part in the dashboard and including a moto- group

  fan having a case housing a driven turbine

  by a motor for the suction of an air flow.

  This air flow is sucked in by outside air or recirculation air intakes and is then discharged under pressure to an outlet pipe. More particularly, the air flow is sucked axially from the inside of the turbine and is then discharged radially outwards by centrifugal effect. The air thus discharged is channeled by an element called "volute", part of the housing, which envelops the

  circumferentially turbine with increasing section.

  In motor-fan units of this type, the turbine can be simple and mounted at the end of the motor shaft or be double and composed of two elements wedged on the shaft of the

  engine, on both sides of it.

  The pressurized air flow then passes through a block

  heating-refrigeration unit installed downstream of the power unit

  fan and comprising at least one heat exchanger (radiator and possibly evaporator) for heating or cooling the air which will then be supplied to

  the passenger compartment through various pipes and distribution outlets

  tion. In a device of the aforementioned type, it is necessary to

  be able to easily access the motor-fan assembly, in particular

  to replace the motor-turbine assembly in the event of

  failure of it. However, access to the motor-ventilated group

  The engine often poses particular difficulties in view of the numerous equipment present in the engine compartment and the passenger compartment. In known devices of this type, access to the motor-fan unit takes place either on the side of the engine compartment, or on the side of the passenger compartment, and requires long dismantling operations. In addition, it is necessary

  generally to completely remove the motor-ventilated group

  then take it apart itself, which increases

still the intervention time.

  When access is via the engine compartment, it is necessary to provide a wide opening through the bulkhead which separates the engine compartment from the passenger compartment, to allow the passage of at least part of the motor-fan unit. This results in a weakening of the vehicle structure and the creation of noise pollution

in the passenger compartment.

  In addition, it is not always possible to release access to an air filter from the device. Generally it is impossible to be able to penetrate this air filter deep enough into the device to be able to

  filter both outside and recirculated air.

  Often devices with access to the air filter

  kills by the engine compartment only filter outside air

laughing.

  In devices where access is via the passenger compartment, the motor-fan unit is often placed behind the glove box. This location is currently very popular because the volume available for glove boxes is very reduced by the location of the air bags of

  security. The trend is to place the motor-ventilated group

  tor in a more centered position relative to the main axis of the vehicle. However, such a location creates conflicts, when dismantling the motor-fan assembly, with the location of the battery, the dashboard ducts, the instrumentation boxes, etc. The object of the invention is in particular to overcome the drawbacks

mentioned above.

  To this end, it offers a device of the type defined in

  introduction, in which the motorized fan unit housing

  tor comprises a removable part capable of being separated from a fixed part of the housing and located near the dashboard, which allows access to the turbine and to the engine after

  disassembly of at least part of the dashboard.

  By the expression "fixed part" is meant here designating a part of the housing which is generally integral with the structure of the vehicle, for example a transverse beam

  or of the bulkhead separating the engine compartment from the passenger compartment.

  As a result, the dismantling of the removable part does not completely separate the fixed part from the structure

of the vehicle.

  Thus, access to the motor-fan unit is made from the passenger compartment after removal of at least part of the dashboard and separation of a removable part of the housing. Once these disassembly operations have been carried out, the motor-turbine assembly can be easily removed to be replaced or repaired and then replaced, without this

  it is necessary to remove the fixed part of the housing.

  To access the housing, it is possible to remove complete-

  the dashboard or a top cover which

  forms the outer skin of the dashboard.

  However, in a preferred embodiment of the invention

  tion, this dashboard includes a removable hatch

  suitable for giving access to the housing.

  The removable part of the housing can be independent of the dashboard, preferably being located in part

upper case.

  As a variant, the removable part of the housing is integral with the aforementioned removable hatch, this hatch preferably being

  located in the upper part of the dashboard.

  Advantageously, the removable hatch is capable of closing an opening of homologous shape formed in the wall of the

dashboard.

  Preferably, this removable hatch is snap-mounted

  tage in the opening of the dashboard.

  Usually, the motor of the fan-motor group is controlled from a control module fixed outside the housing. It is then advantageous that this control module is also accessible after dismantling at least part of

the dashboard.

  In another embodiment of the invention, the removable part of the housing incorporates an air distribution duct

  powered by the motor-fan unit.

  According to another characteristic of the invention, the fixed part of the housing forms a cradle for receiving the engine and the turbine, while the removable part forms an adaptable cover on the fixed part to enclose the

engine and turbine.

  In a preferred embodiment of the invention, the fan assembly comprises two turbines arranged

on the other side of the engine.

  In another aspect, the invention relates to a driving position of a motor vehicle comprising a heating and / or air conditioning device as defined above, specific

  to be implanted at least partially in the dashboard.

  In the following description, made only as

  example, reference is made to the accompanying drawings, in which: - Figure 1 is a partial perspective view of a dashboard of a motor vehicle housing a device according to the invention; - Figure 2 is a sectional view corresponding to Figure 1 before removal of the hatch; Figure 3 is a view similar to Figure 2 after removal of the hatch; and - Figure 4 is a figure similar to Figure 2 in a

variant.

  First of all, reference is made to FIGS. 1 and 2 which show a dashboard 10 forming part of a driving position of a motor vehicle and in which a device is housed

  heating and / or air conditioning 12 according to the invention.

  This device comprises a motor-fan unit 14, also called a "blower", comprising a housing 16 housing a motor

  electric motor 18 rotating two centrifugal turbines

  ges 20. The latter are wedged on the drive shaft 22 of the motor, on either side of the latter. In the example,

  this tree rotates around an axis X-X which extends horizontally-

  and transversely to the longitu-

vehicle data.

  The housing 16 is formed of two parts: a fixed part 24, also called "lower part", and a removable part 26, also called "upper part" (Figure 2). The fixed part 24 forms a cradle to receive the engine 18 and the turbines 20, while the removable part 26 forms an adaptable cover on the fixed part 24 to enclose the

engine and turbines.

  The parts 24 and 26 of the housing constitute two shells which, when assembled, delimit two opposite air inlets to suck a flow of air into the turbines in the

  axial direction. These turbines have suitable blades

  required which allow the air to be forced in a radial direction towards the outside. This air is then channeled into an element 30, also called a volute. From there, the air flow passes through at least one heat exchanger 32 forming part of the

device 12.

  The device 12 further comprises an air filter 34 disposed upstream of the motor-fan unit 14 for filtering the flow

  air before it enters the housing 16.

  In the example shown, the heating and / or air conditioning device 12 is located substantially in the central part of the vehicle while being housed at least partly in the

dashboard 10.

  The latter comprises a wall 36 near which is located the housing 16 of the motor-fan unit. The wall 36 has an opening 38 of generally oblong shape,

  fitted in the central region of the dashboard.

  The opening 38 is suitable for being closed by a hatch

  removable 40 of homologous shape forming a cover and susceptible

  ble to be made integral with the dashboard by any appropriate means, in particular by snap-fastening. As can be seen in Figures 2 and 3, the removable part of the housing 14

  is integral with the removable hatch 40 so as to constitute

kill a one-piece assembly.

  Thus, when the hatch 40 is separated from the dashboard, it takes with it the removable part 26 of the housing, which gives access to the blower and in particular to the engine-turbine assembly, as shown in FIG. 3. When the hatch is removed, we can then extract the motor-turbine assembly

  to repair or exchange it with a new set. Remove it

  also allows the air filter to be replaced

34 with a new filter.

  It will also be noted that the device of the invention comprises a control module 42 used to control the engine. This module comprises a base 41 fixed to the outside of the fixed part of the housing and a part 43 attached to the base and projecting inside the housing so as to be able to be cooled by the air flow discharged by the motor-fan unit. This module 42 is therefore removable from the outside of the housing without in principle requiring

disassembly of the latter.

  It is thus possible to access this control module after dismantling at least part of the dashboard and to remove it after dismantling the electrical connections which it comprises. It is advantageous to have the module

  control near the electric motor of the power unit

  fan. Indeed, if access to this engine requires the disassembly of part of the dashboard, access to the speed variation module could also require it. In the embodiment of Figure 4, the removable part 26 of the housing 14 incorporates a distribution conduit

  of air 44, which is supplied by the motor-fan unit.

  The removable part 26 and the distribution duct 44

  form a one-piece assembly with the hatch 40. In the example

  ple, the duct 44 is a defrosting duct leading to at least one mouth 46 for demisting / defrosting the windshield 48

of the vehicle.

  Of course, the invention is not limited to the embodiments described above by way of example and

  extends to other variant embodiments.

  Thus, the removable part of the housing is not necessarily integral with a hatch cooperating with an opening of the

dashboard.

  Indeed, it can be provided that this removable part is completely independent of the dashboard and that this

  the latter either with or without an access hatch.

  It will indeed be understood that access to the removable part of the housing can be carried out by removing all or part of the

dashboard.

  The device of the invention thus allows easy access to the fan assembly, while reducing

  significant disassembly times and costs.

Claims (13)

Claims   1. Heating and / or air conditioning system for the home   key of a motor vehicle, suitable for being installed at least in part in the dashboard and comprising a motor-fan unit having a housing housing a turbine driven by a motor for the suction of an air flow,   characterized in that the housing (16) of the motor-ventilated group   teur (14) comprises a removable part (26) adapted to be separated from a fixed part (24) of the housing and located near a wall (36) of the dashboard (10), which allows access the turbine (20) and the motor (18) after   disassembly of at least part of the dashboard (10).   2. Device according to claim 1, characterized in that the dashboard (10) comprises a removable hatch (40)   suitable for giving access to the housing (16).   3. Device according to claim 2, characterized in that the removable part (26) of the housing (16) is independent of the dashboard (10).   4. Device according to claim 3, characterized in that the removable part (26) is located in the upper part of the housing (16).   5. Device according to claim 2, characterized in that the removable part (26) of the housing (16) is integral with the removable hatch (40).   6. Device according to claim 5, characterized in that the removable hatch (40) is located in the upper part of the dashboard (10).   7. Device according to one of claims 2 to 6,   characterized in that the removable hatch (40) is suitable for closing an opening (38) of homologous shape made in the   wall (40) of the dashboard (10).   8. Device according to claim 7, characterized in that the removable hatch (40) is snap-fitted in   the opening (38) of the dashboard (10).   9. Device according to one of claims 1 to 8,   further comprising a control module (42) of the motor (18), fixed to the outside of the housing (16), characterized in that this control module (42) is also accessible after   disassembly of at least part of the dashboard (10).   10. Device according to one of claims 1 to 9,   characterized in that the removable part (26) of the housing (16) incorporates a supply air duct (44)   by the motor-fan unit (14).   11. Device according to one of claims 1 to 10,   characterized in that the fixed part (24) of the housing (16) forms a cradle for receiving the motor (18) and the turbine (20), while the removable part (26) forms an adaptable cover on the fixed part (24) to enclose the engine and turbine.   12. Device according to one of claims 1 to 11,   characterized in that the motor-fan unit (14) comprises two turbines (20) arranged on either side of the motor (18).   13. Motor vehicle driving station comprising a heating and / or air conditioning device according to one of the   claims 1 to 12 suitable for being implemented at least in part in the dashboard.