AIR DISTRIBUTION APPARATUS FOR THE OCCUPANT COMPARTMENT OF AUTOMOTIVE VEHICLES

Abstract: In this invention a variable speed transverse fan assembly (36) is provided for booster application in multi-ducted heating, ventilating and air conditioning systems for automotive vehicle. The transverse fan assembly may be employed in a front arm rest and is selectively powered to provide air flow control to the rear passengers such as by increasing flow to the rear passenger when the main fan (15) is on low speed. Because of the high turbining loss characteristic of this type of fan, a significant reduction of the air flow to the rear can be obtained if desired by turning the transverse booster fan off when the main fan is on high speed.

Description: This invention relates to heating, ventilating and air conditioning (HVAC) for occupant compartments of automotive vehicles and more particularly to a new and improved air distribution apparatus providing optimized control of HVAC for passengers whether in front or rear seating areas of the occupant compartment. In US Patent No. 4,343,230, an air distributing apparatus is disclosed in which both front and rear seated passengers have HVAC air selectively deliverable to their seats with the rear air flow selectively controlled by an auxiliary fan within rearwardly-extending ducts having outlets in the rear passenger seating area in the occupant compartment. In view of automotive space constraints and routing required for effective delivery by apparatus such as set forth in the above US patent, special duct work and specialized air boosters will be required. An air distribution apparatus in accordance with the present invention is characterised by the features specified in the characterising portion of claim 1. The present invention provides a new and improved air distribution apparatus utilizing auxiliary duct work, of rectilinear cross section, which forms a straight through air flow path that is directly routed from front distributing duct work to the rear seating area for selective and effective air delivery for all seating areas. Preferably, this duct work also serves as part of a structural component of the vehicle such as door mounted arm rest or a centralized console and is pneumatically fed to a terminus having outlets adjacent to the rear seated passengers. In this invention, a transverse fan assembly is needed to control the flow level to a particular location independent of the flow level in the preceding air distribution apparatus that in the preferred embodiment is formed by the front air distribution apparatus. In this invention, a transverse fan assembly having a straight through flow path from inlet to outlet when powered is employed since it can be made to fit any height-width ratio of the rectilinear cross section of the rearwardly directed duct work. In addition, the transverse fan assembly is employed with a "pancake" motor with variable speed output that can be located outside of the duct work thereby avoiding any undesired blockage or restriction of the air flow path that would occur with axial flow fans. In this invention, there is new and improved selective and control of air flow to the rear passenger compartment or seating area of an automotive vehicle. For example, when the variable speed main or primary fan is selected for low speed operation to suit front occupant comfort, the transverse fan assembly can be selectively driven at low intermediate or high speeds to provide increased flow to the rear passengers to suit their needs. Important advantage is, however, taken of the high turbining loss characteristic of the transverse type of fan assembly to selectively provide a significant reduction in the air flow to the rear seating area for all primary air blower speeds obtained. This is accomplished by eliminating boost simply by turning the transverse fan assembly off to stop fan drive or by driving the transverse fan assembly at low speed when, for example, the primary air blower is set for a high volume output. The same transverse fan assembly construction can be used for both left and right hand doors with the peripheral blades configured to pump air rearwardly. It is an object of this invention to provide an air distribution apparatus for the occupants compartment of a vehicle featuring a variable speed transverse fan assembly in supplemental ducting leading from a conventional multi-outlet frontal ducting for heating, ventilating and air conditioning so that a wide range of air flow levels are available for delivery downstream of the frontal system. This invention also provides a new and improved air distribution apparatus for vehicles with transverse fan assemblies within passages of interior vehicle components to control the flow level to air discharge openings in the rear seating area independent of the flow level in the preceding air distribution apparatus for the front seating area. This invention further provides a new and improved air distribution apparatus for the occupants compartment of a vehicle which features a wide range of output volumes of air personally selected by occupants in separate seating areas in the vehicle. These objectives are acheived according to the invention by providing an air distribution apparatus of the type disclosed in US-A-4 343 230 and defined in the preamble of claim 1, with those features referred to in the characterising portion of claim 1. The present invention will now be described, by way of example, with reference to the following detailed description, and the accompanying drawings, in which: Figure 1 is a pictorial sketch of a portion of the interior of a vehicle illustrating an air distribution apparatus of this invention; Figure 2 is a cross-sectional view with parts in elevation taken generally along lines 2-2 of Figure 1; and Figure 3 is a cross-sectional view taken generally along lines 3-3 of Figure 2. Turning now in greater detail to the drawings, there is shown in Figure 1 the left side front and rear seating areas 10 and 12 respectively of the occupant compartment of an automotive vehicle which are separate and discrete because of conventional seats for the driver and other occupants. The front seating area 10 has, within the vehicle, a laterally extending and substantially modular duct work, the left hand side extension 14 being illustrated, to distribute HVAC air as shown by flow arrow A to the front seating area 10. A variable speed primary air blower 15 driven by an electric motor, which may be like that disclosed in U.S. Patent No. 3,263,739, is employed to force HVAC air through this front duct work. The rotational speed and output of this primary air blower 15 is selected by the vehicle operator through a conventional rotary switch 16. The side extension 14 has a side opening 17 that is adapted to pneumatically communicate with a narrow longitudinally extending side duct 18, rectilinear in cross section and secured to the side of the left front door 19. This side duct 18 may be moulded from a suitable plastics material or fabricated from metal stock. The side duct 18 may also be formed as part of the door panel 58 which is secured to the door structure. In any event, the side duct 18 has a foam cover 20 or other padding to provide a comfortable arm rest 21 for the vehicle operator or the front passenger. The side duct 18 terminates at a discharge end 22. When the left front door 19 is closed, the discharge end 22 pneumatically communicates with a crossover passage 23 formed in a cover 26 for the door pillar. This crossover passage 23 provides for routing of HVAC air, arrow B, to a distribution chamber 27 communicating with the crossover passage 23. Distribution chamber 27 is attached to the rear door or side panel and is formed with top and bottom discharge ports 28 and 30 respectively having conventional adjustable louvers moved between fully opened and closed positions by a conventional lever system through manual operation of upper and lower control levers 32 and 34 respectively to adjust the direction and volume of air flow illustrated by flow arrows C and D. Importantly, in this invention an air boost is provided within the side duct 18 and arm rest 21 for controlling the air flow through the discharge ports 28 and 30. As illustrated, this invention incorporates a transverse fan assembly 36 with a bladed cage having laterally spaced, annular sides 40, 42 connected by an array of peripheral blades 44 for pumping air from an inlet 46 defined by upper and lower scrolls 48 and 50 respectively which may be moulded with side duct 18. The transverse fan assembly 36 is rotatably driven at varying speeds (counterclockwise in viewing Figure 3 as indicated by arrow 37) by an electrically energized pancake motor 54 whose housing is fixed by suitable fastening means 56 to the door panel 58. The pancake motor 54 has a laterally extending output shaft 60 that is drivingly connected to the outer side of the transverse fan assembly 36 which is mounted in a rotor space 62 defined by the upper and lower scrolls 48 and 50. When energized by operation of a speed control switch 64, located adjacent to the rear seat, the rear passenger can select the speed and the volume of HVAC air to rear seating areas. For example, the booster speed and output can be selected for high, medium and low. The transverse fan assembly 36, especially when not powered by the pancake motor 54, has a high turbining loss characteristic to significantly reduce air flow to the rear discharge ports 28 and 30. This reduced flow of air can be further blocked or adjusted in flow levels by appropriate louver setting between fully closed and open positions. It will be appreciated that operating the transverse fan assembly 36 at low speed while the primary air blower 15 is operating at a high speed, will cause a reduction in flow to the rear seat areas to occur. This reduced flow is, of course, greater than that of the turbining booster. In any event, by operating the transverse fan assembly 36 to the selected speed level, the pumped flow is straight through the transverse fan assembly 36 as illustrated by arrows 65 to the rear passenger seating area and the flow level selected is substantially independent of the flow level in the front air distribution system in any particular mode of operation. If the front air is cooled and dehumidified by an air conditioner apparatus and the primary blower 15 is on low speed, the transverse fan assembly 36 can be selectively operated at high speed by the rear seated passenger so that large quantities of cooled and dehumidified air can be supplied to the rear passengers where such is not desired by the driver. This invention accordingly provides the vehicle occupants and particularly the rear seated occupants with an independent and wide selection of air flow control from minimum flow (booster fan off and turbining) to maximum flow (booster fan set for high speed and maximum output with optimized system efficiency by straight through booster pumping).

Claims: 1. An air distributing apparatus for a vehicle having discrete front (10) and rear (12) seating areas, comprising forward duct work (14) having discharge openings (17) for the front seating area; a primary air blower (15) for forcing air through the apparatus; and a secondary duct (18) having a generally rectilinear cross section, and an inlet operatively connected to the forward duct work for the passage of air therethrough, the secondary duct extending from the front seating area to the rear seating area for distributing air thereto through an outlet (28, 30); a fan assembly (36) operatively driven by a variable speed motor (54) and operatively mounted within the secondary duct; and speed control means (64) for controlling the output speed of the variable speed motor (54) and thereby the output speed of the fan assembly characterised in that the variable speed motor (54) is mounted externally of the secondary duct (18) and that the fan assembly is a transverse fan assembly for selectively reducing or increasing air flow to the rear seating area (12) when stationary and when rotatably driven at predetermined speeds for all levels of air flow in the forward duct work (14) as generated by the primary air blower (15). 2. An air distribution apparatus as claimed in claim 1, wherein the vehicle has side doors and the secondary duct (18) is in at least one of the side doors (19) of the vehicle and forms an arm rest (21) for a vehicle occupant.

Inventors: MELLIN, ROBERT CLAYTON, YOTT, EDWARD W.
Applicants: GENERAL MOTORS CORPORATION
Application year: 1988
Main classification: B60H1
IPC codes: B60H1