JP4011720B2 - Air conditioner for automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive air conditioner.
[0002]
[Prior art]
As is well known, an automotive air conditioner has an air mix door between an evaporator and a heater core, and distributes cold air that has passed through the evaporator by the air mix door to a heater core side and a bypass passage side that bypasses the heater core. The temperature is controlled by controlling.
[0003]
Hot water is supplied to the heater core via a heater pipe that is diverted from the engine cooling system, but if hot water is continuously supplied to the heater core, all of the cold air that has passed through the evaporator by blocking the heater core side with the air mix door is removed. In the full cool mode for circulation through the bypass passage, the heat dissipation of the heater core will be damaged and the full cool performance will be deteriorated. Therefore, a water valve is provided in the heater pipe, while a lever is fixed to the drive shaft end of the air mix door. By connecting the lever and the valve shaft of the water valve with a rod with an adjustment mechanism, the water valve is controlled in conjunction with the rotation of the air mix door, thereby controlling the hot water supply to the heater core. Has been attempted to do.
[0004]
[Problems to be solved by the invention]
However, as described above, when the lever of the drive shaft end of the air mix door and the valve shaft of the water valve are connected by the rod provided with the adjustment mechanism, the number of parts increases and the adjustment mechanism This is not only disadvantageous in terms of cost and construction, but also disadvantageous in performing appropriate hot water supply control.
[0005]
Therefore, the present invention can control the hot water supply to the heater core with a simple structure and can be advantageously obtained in terms of cost, as well as an air conditioner for automobiles capable of performing an appropriate hot water supply control. Is to provide.
[0006]
[Means for Solving the Problems]
In the first aspect of the invention, the air mix door is disposed between the evaporator and the heater core in the case, and controls the distribution of the cold air that has passed through the evaporator to the heater core side and the bypass passage that bypasses the heater core. And a cam portion having a cam surface formed on the end surface thereof and an outer surface of the side wall of the case, the hot water supplied to the heater core. A water valve that controls supply, and a cam follower that extends on a valve shaft of the water valve and that is in sliding contact with the cam surface. The cam surface is configured to be connected to the cam follower when the air mix door is in the fully closed position on the heater core side. The COLD side flat surface that is in sliding contact with the CLD side flat surface is formed at a position shifted in the axial direction of the drive shaft, and the air mix door is a heater. The HOT side flat surface that is in sliding contact with the cam follower when in the fully open position, and the COLD side flat surface are spirally formed along the circumferential direction of the drive shaft between the COLD side flat surface and the HOT side flat surface. And a slope connecting the HOT side flat surface, and driving the sliding contact position with the cam surface of the cam follower in conjunction with the movement of the air mix door to the heater core side fully closed position and the heater core side fully open position . A hot water control mechanism is provided that controls the opening degree of the water valve from fully closed to fully open by rotating the valve shaft by changing the axial direction of the shaft .
[0007]
According to a second aspect of the present invention, the air mix door according to the first aspect is provided with a tooth portion provided on the door main body and a drive shaft pivotally supported on the side wall of the case and meshed with the tooth portion. As a slide door structure in which the door body is slid between the bypass passage side and the heater core side by a slide mechanism provided with a cam portion of a hot water control mechanism at the end of the drive shaft. Yes.
[0008]
【The invention's effect】
According to the first aspect of the present invention, the hot water control mechanism has a structure in which the cam follower at the valve shaft end of the water valve is directly slidably contacted with the cam portion at the drive shaft end of the air mix door. In addition to the fact that it can be reduced, only the operation of slidingly engaging the cam part and the cam follower at the predetermined opening position of the air mix door does not involve any adjustment work in the connection between the cam part and the cam follower. Attaching work can be simplified and can be advantageously obtained in terms of cost.
[0009]
Moreover, a desired warm water flow rate characteristic can be easily obtained by setting the cam profile of the cam portion.
[0010]
According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, since the air mix door has a slide door structure, the space between the evaporator and the heater core can be reduced as much as possible. Can be miniaturized.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0012]
1-4, 1 shows the case of an air-conditioning unit, and in the case 1, from the upstream side of the air blown from the blower unit (not shown) connected to the blower connection port 2, the evaporator 3 and the heater core 4 Are arranged in this order.
[0013]
Between the evaporator 3 and the heater core 4, the cool air that has passed through the evaporator 3 is selectively passed downward to direct the heater core 4 or upwardly directed to the bypass passage 5 that bypasses the heater core 4. An air mix door 6 that distributes them at an appropriate ratio is disposed on both of them, and air that mixes the cold air that has passed through the bypass passage 5 and the warm air that has passed through the heater core 4 in the upper portion of the heater core 4 is mixed. There is a mix chamber 7.
[0014]
A vent outlet 8 that is opened and closed by a vent door 9 is provided on the upper wall of the case 1 above the air mix chamber 7, and a defroster outlet that is opened and closed by a differential door 11 adjacent to the front side of the vent outlet 8. 10 is provided.
[0015]
A foot passage 13 is separated by a partition wall 12 on the rear side of the air mix chamber 7.
[0016]
The foot passage 13 extends vertically in the case 1, has a foot outlet 14 at the lower end, and communicates with the air mix chamber 7 in the vicinity of the vent outlet 8.
[0017]
In this embodiment, a rear vent outlet 15 is opened in the lower rear wall of the foot passage 13 in the vicinity of the foot outlet 14, and the switching door 16 switches the ventilation between the foot outlet 14 and the rear vent outlet 15. Is arranged.
[0018]
Here, the air mix door 6 has a slide door structure in which the door main body 6a is slid by a slide mechanism M between a position where the heater core 4 side is fully closed and a position where the bypass passage 5 is fully closed.
[0019]
Specifically, a pair of upper and lower guide pins 17 project from the both ends of the door body 6a, while a pair of upper and lower guide grooves engage with the guide pins 17 on the side wall of the case 1. 18 is provided so that the door body 6a can be slid in the vertical direction by the guide action of the guide pins 17 and the guide grooves 18.
[0020]
A tooth portion 19 is provided in the vicinity of both side edges of the door body 6a, and a gear 21 fixed to the drive shaft 20 penetrating both side walls of the case 1 is engaged with the tooth portion 19 so that the drive shaft 20 The sliding movement of the door body 6a is performed by rotation.
[0021]
In the present embodiment, the vent door 9 and the differential door 11 are also slid and moved by the slide mechanism M in the same manner as described above to open and close the vent outlet 8 and the defroster outlet 10.
[0022]
A drive gear 22 is fixed to a shaft end portion of the drive shaft 20 of the air mix door 6 that protrudes outside the case 1, and a cylindrical cam surface 24 is formed on the side surface of the drive gear 22. The cam portion 23 is projected concentrically.
[0023]
A water valve 25 for controlling the hot water supply to the heater core 4 is attached to the outer surface of the case side wall in the vicinity of the cam portion 23.
[0024]
An end portion of the valve shaft 26 of the water valve 25 is bent and extended in a crank shape to form a cam follower 27 that is slidably engaged with the cam surface 24 of the cam portion 23.
[0025]
A set spring 28 for urging the valve shaft 26 in the valve closing direction is mounted on the valve shaft 26 outside the valve housing, and the cam follower 27 is pressed against the cam surface 24 by the urging force of the set spring 28. The cam portion 23, the water valve 25, and the cam follower 26 constitute a hot water control mechanism 29.
[0026]
The cam surface 24 rotates in the direction in which the drive shaft 20 closes the heater core 4 side by the door body 6a, and the COLD side is flat so that the water valve 25 is kept fully closed from a position where the passage on the heater core 4 side is fully closed. The surface 24a and the drive shaft 20 are rotated by the door body 6a in a direction to open the heater core 4 side, and the HOT side flat surface 24b that keeps the water valve 25 fully opened from a position where the passage on the heater core 4 side is fully opened. And a slant surface 24c that is formed continuously with the flat surfaces 24a and 24b and that opens and closes the water valve 25 linearly as the drive shaft 20 rotates.
[0027]
That is, the hot water control mechanism 29 opens the water valve 25 from fully closed to fully open in conjunction with the sliding movement between the heater core side fully closed position and the heater core side fully open position of the door body 6a of the air mix door 6. It comes to control.
[0028]
According to the structure of the above embodiment, the door main body 6a of the air mix door 6 is slid to, for example, a position that closes the passage on the heater core 4 side, and all the cold air that has passed through the evaporator 3 is passed to the bypass passage 5, In the full cool vent mode in which the cold air is blown out from the vent outlet 10 via the air mix chamber 7, the COLD side flat surface 24a of the cam surface 24 of the cam portion 23 provided at the end of the drive shaft 20 of the door body 6a. Is located at the end of the cam follower 27, and the water valve 25 is fully closed to shut off the supply of hot water to the heater core 4.
[0029]
As a result, the cool air passing through the air mix chamber 7 is not affected by the heat of the heater core 4 during the full cool operation in the vent mode, and the full cool performance can be improved.
[0030]
When the door main body 6a of the air mix door 6 is slid upward from the position where the passage on the heater core 4 side is fully closed by mode switching, and the passage on the heater core 4 side opens, the cam of the cam portion 23 The sliding contact position between the surface 24 and the cam follower 27 end is shifted from the COLD side flat surface 24a to the inclined surface 24c, and the opening degree of the water valve 25 is controlled in the opening direction according to the inclined position of the inclined surface 24c. Hot water is supplied at a flow rate that matches the valve opening.
[0031]
In the full hot foot mode in which the door body 6a is slid to a position where the bypass passage 5 is fully closed and the passage on the heater core 4 side is fully opened and all the cold air that has passed through the evaporator 3 passes through the heater core 4. 23, the sliding contact position between the cam surface 24 and the cam follower 27 end shifts from the inclined surface 24c to the HOT side flat surface 24b, and the water valve 25 is fully opened.
[0032]
Here, the hot water control mechanism 29 has the cam follower 27 end extended from the valve shaft 26 end of the water valve 25 on the cam surface 24 of the cam portion 23 provided at the drive shaft 20 end of the air mix door 6 as described above. Since the structure is in direct sliding contact, the number of parts can be reduced as much as possible.
[0033]
Moreover, at a predetermined opening position of the door main body 6a of the air mix door 6, for example, at a position where the passage on the heater core 4 side is fully closed by the door main body 6a, the COLD side flat surface 24a of the cam surface 24 and the end of the cam follower 27 No adjustment work is involved in the connection between the cam portion 23 and the cam follower 27 only by the sliding engagement operation.
[0034]
Therefore, the cost can be advantageously obtained by reducing the number of parts and simplifying the assembling work.
[0035]
Moreover, a desired hot water flow rate characteristic can be easily obtained by setting the cam profile of the cam portion 23.
[0036]
On the other hand, apart from the structural effect of the hot water control mechanism 29, in the present embodiment, as described above, the air mix door 6 has a slide door structure in which the door body 6a is slid by the slide mechanism M. The space | interval between the evaporator 3 and the heater core 4 can be narrowed as much as possible, and size reduction of an air conditioning unit can be achieved.
[0037]
Note that the present invention is not limited to the slide-type air mix door structure, but can be applied to a flap-type air mix door that swings around a drive shaft as a fulcrum.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a perspective view showing a relationship between an air mix door and a hot water control mechanism in the embodiment.
3 is an enlarged perspective view of the hot water control mechanism shown in FIG. 2. FIG.
FIG. 4 is a perspective view showing a cam portion of a hot water control mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 3 Evaporator 4 Heater core 5 Bypass passage 6 Air mix door 6a Door main body 19 Tooth part 20 Drive shaft 21 Gear M Slide mechanism 23 Cam part 25 Water valve 26 Valve shaft 27 Cam follower 29 Hot water control mechanism

Claims (2)

A bypass passage (5) disposed between the evaporator (3) and the heater core (4) in the case (1) and bypassing the cool air passing through the evaporator (3) between the heater core (4) and the heater core (4). In the structure equipped with an air mix door (6) that controls air distribution to
A cam portion (23) provided at an end portion of the drive shaft (20) of the air mix door (6) projecting out of the case (1) and having a cam surface (24) formed on the end surface ;
A water valve (25) disposed outside the side wall of the case (1) for controlling the supply of hot water to the heater core (4);
A cam follower (27) extending on the valve shaft (26) of the water valve (25) and in sliding contact with the cam surface (24) ;
The cam surface (24)
A COLD side flat surface (24a) in sliding contact with the cam follower (27) when the air mix door (6) is in the heater core side fully closed position;
A HOT formed in a position shifted in the axial direction of the drive shaft (20) with respect to the COLD side flat surface (24a) and in sliding contact with the cam follower (27) when the air mix door (6) is in the heater core side fully open position. Side flat surface (24b);
The COLD side flat surface (24a) and the HOT side flat surface (24b) are spirally formed along the circumferential direction of the drive shaft (20). The COLD side flat surface (24a) and the HOT side flat surface ( A slope (24c) connecting 24b);
Have
The sliding contact position of the cam follower (27) with the cam surface (24) in conjunction with the movement of the air mix door (6) to the heater core side fully closed position and the heater core side fully open position is the axial direction of the drive shaft (20). The vehicle air conditioner is provided with a hot water control mechanism (29) that controls the opening degree of the water valve (25) from fully closed to fully open by rotating the valve shaft (26) by changing the valve shaft (26) .   The air mix door (6) is provided on the tooth portion (19) provided on the door main body (6a) and the drive shaft (20) pivotally supported on the side wall of the case (1) and meshes with the tooth portion (19). As a slide door structure in which the door body (6a) is slidably moved between the bypass passage (5) side and the heater core (4) side by a slide mechanism (M) provided with the gear (21), the drive shaft The automotive air conditioner according to claim 1, wherein a cam portion (23) of the hot water control mechanism (29) is provided at an end portion of (20).

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