JP3440720B2 - Ram pressure adjustment mechanism of vehicle air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ram pressure adjusting mechanism provided in a vehicle air conditioner.

[0002]

2. Description of the Related Art In a vehicle air conditioner, an outside air mode and an inside air mode can be selected by operating an inside / outside air switching door. However, when the outside air mode is selected while the vehicle is traveling at high speed, the traveling pressure (ram pressure) As a result, the amount of air flowing into the passenger compartment increases, which affects the temperature controllability of the air conditioner. Therefore, conventionally, there is an inside / outside air switching device provided with a ram pressure adjusting door for varying the suction resistance in the outside air mode according to the vehicle speed. With this ram pressure adjusting door, the temperature controllability can be improved by controlling the amount of air introduced into the vehicle compartment by the running pressure so that it is constant or does not change more than necessary (called ram pressure control). .

[0003]

However, since the conventional ram pressure control is performed by a single ram pressure adjusting door,
As shown in FIG. 7, the control air volume suddenly increases with the opening of the door, and if the door is opened to some extent, the same state is obtained without the door. That is, since the control range on the control side is narrower than the movable range of the door, there is a problem that fine control is difficult and difficult to use. The present invention has been made based on the above circumstances, and an object thereof is to improve controllability of ram pressure control air volume in a ram pressure adjusting mechanism of a vehicle air conditioner.

[0004]

According to the first to fourth aspects of the invention, the ram pressure adjusting door is constituted by a plurality of doors, and the plurality of doors are driven by the driving means in different movements. The different movement includes a case where the operation start timing of each door is different and a case where the operation speed of each door is different. As a result, for each door of the ram pressure adjustment door,
Since the area where the control air volume changes largely with respect to the door opening change (that is, the area where linear control is possible) can be used, the linear controllability of the ram pressure adjustment door can be improved, and fine control on the control side is possible. Becomes In addition, since the ram pressure adjusting door is composed of a plurality of doors, the working space can be made smaller than that of a conventional single door, so that restrictions on the layout of the door are also reduced.
It should be noted that the plurality of doors may be driven by dedicated drive means, respectively, or a plurality of doors can be driven by one drive means by using a link mechanism that connects the plurality of doors.

According to the means of claim 5, since the plurality of doors are butterfly doors respectively, the working space can be made smaller than that of the door having the rotary shaft at the end thereof.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a ram pressure adjusting mechanism for a vehicle air conditioner according to the present invention will be described with reference to the drawings. The vehicle air conditioner includes an inside / outside air switching device 1 that switches an air introduction port according to a suction port mode. The inside / outside air switching device 1 is
An inside / outside air switching box 4 having an inside air inlet 2 and an outside air inlet 3 which are air inlets, an inside / outside air switching door 5 for selectively opening / closing the inside air inlet 2 and the outside air inlet 3, and an outside air mode are set. The ram pressure adjusting doors 6, 7 for changing the opening ratio of the outside air introducing port 3, and the inside / outside air switching door 5 and the ram pressure adjusting door 6,
It is composed of driving means (described later) for driving 7 in conjunction with each other.

The inside / outside air switching door 5 is provided with a support shaft 5a rotatably supported by the inside / outside air switching box 4, and an outside air mode position for closing the inside air introduction port 2 with the support shaft 5a as a rotation center (see FIG. 2 to 4) and the inside air mode position (the position shown in FIG. 1) that closes the outside air inlet 3 are rotated. The ram pressure adjusting doors 6 and 7 are so-called butterfly doors, each of which includes a first door 6 and a second door 7, and the support shafts 6a and 7a of the doors 6 and 7 are provided in the center of the doors. Doors 6 and 7
Is arranged on the side of the outside air introduction port 3 of the inside / outside air switching box 4, and opens according to the vehicle speed when the suction port mode is the outside air mode (the inside / outside air switching door 5 closes the inside air inlet 2). The degree (opening ratio of the outside air inlet 3) is changed.

The driving means is an actuator 8 (for example, a servomotor) that generates a driving force (rotational force), and a first link mechanism (lower) which connects the actuator 8 with the inside / outside air switching door 5 and the first door 6. (Described below) and a second link mechanism (described below) that connects the first door 6 and the second door 7 together. The actuator 8 is fixed to the outside of one side wall surface of the inside / outside air switching box 4 by tightening a screw (not shown) or the like. This actuator 8
Operates by receiving a control signal from an ECU (electronic control unit / not shown) mounted on the vehicle to generate a rotational force on the output shaft 8a.

The first link mechanism includes two drive levers 10 and 11 connected to an output shaft 8a of an actuator 8 and a drive lever 1 as shown in FIGS.
Link lever 1 that transmits 0 operation to the inside / outside air switching door 5
2 and a link lever 13 for transmitting the operation of the drive lever 11 to the first door 6. This first link mechanism
The inside / outside air switching box 4 is provided on the wall surface side to which the actuator 8 is fixed. The drive levers 10 and 11 rotate integrally with the output shaft 8a of the actuator 8.
Engaging pins 10a and 11a are provided at the pivoting tips of the drive levers 10 and 11, respectively.

One end of the link lever 12 is fixed to the support shaft 5a of the inside / outside air switching door 5, and the link lever 12 is provided so as to be rotatable integrally with the inside / outside air switching door 5 about the supporting shaft 5a. The link lever 12 is formed with a link groove 12a into which the engagement pin 10a of the drive lever 10 is fitted. One end of the link lever 13 is the support shaft 6 of the first door 6.
It is fixed to a and is provided so as to be rotatable integrally with the first door 6 around the support shaft 6a. The link lever 13 is formed with a link groove 13a into which the engagement pin 11a of the drive lever 11 is fitted. However, the link groove 13a is provided with the engagement pin 11a provided on the drive lever 11 when the drive lever 11 rotates integrally with the output shaft 8a.
Has an arcuate portion along the trajectory of movement.

The second link mechanism, as shown in each of FIGS. 1 to 4 (a), rotates integrally with the operating lever 14 and the second door 7 which rotate together with the first door 6. It comprises a moving operating lever 15 and an intermediate lever 16 connecting the operating lever 14 and the operating lever 15. The second link mechanism is provided on the wall surface side of the inside / outside air switching box 4 opposite to the wall surface side on which the first link mechanism is provided. Operating lever 14
Has one end fixed to a support shaft 6a of the first door 6 and is provided so as to be rotatable integrally with the first door 6 about the support shaft 6a. Rotating tip of actuating lever 14 (other end)
Has an engaging pin 14a.

One end of the actuating lever 15 is fixed to the support shaft 7a of the second door 7, and the second end of the operation lever 15 is centered on the support shaft 7a.
It is rotatably provided integrally with the door 7. A link groove 15a is formed on the other end side of the operating lever 15.
The intermediate lever 16 includes a rotation fulcrum 16a rotatably supported by the inside / outside air switching box 4, and is rotatably provided about the rotation fulcrum 16a. This intermediate lever 1
6, a link groove 16b into which the engaging pin 14a of the operating lever 14 is fitted is formed, and an engaging pin 16c into which the link pin 15a of the operating lever 15 is fitted is provided. However, the link groove 16b of the intermediate lever 16 is an arc along the track along which the engagement pin 14a provided on the operating lever 14 moves when the operating lever 14 rotates integrally with the support shaft 6a of the first door 6. Have a section.

Next, the operation of this embodiment will be described. a) In the inside air mode. The inside / outside air switching door 5 is driven to the inside air mode position to close the outside air inlet 3. Also, the ram pressure adjusting doors 6 and 7 are
Both doors 6 and 7 are in the state of the minimum opening (the state in which the operating angles are the minimum) (see FIG. 1).

B) When switching from the inside air mode to the outside air mode. When the inside air mode is switched to the outside air mode, the driving force of the actuator 8 causes the driving lever 10 and the link lever 12 to move.
By being transmitted to the inside / outside air switching door 5 through the inside / outside air switching door 5, the inside / outside air switching door 5 is rotated from the inside air mode position to the outside air mode position to close the inside air introduction port 2. On the other hand, in the ram pressure adjusting doors 6 and 7, the driving force of the actuator 8 causes the driving lever 11 to move.
And the first lever 6 is transmitted to the first door 6 through the link lever 13, the first door 6 starts to operate, and
The operation of the first door 6 is transmitted to the second door 7 through the second link mechanism from the middle of the operation of the door 6, and the second door 7 starts to operate.

The operation of the ram pressure adjusting doors 6 and 7 will be described with reference to FIGS.
4 and FIG. 5. Note that FIG. 5 is a graph showing the operating states of the inside / outside air switching door 5 and the ram pressure adjusting doors 6 and 7 when the suction port mode is switched, by operating angles of the respective doors. The first door 6 starts operating halfway through the operation of the inside / outside air switching door 5. That is, even if the actuator 8 operates and the drive lever 11 rotates integrally with the output shaft 8a,
Since the driving force of the actuator 8 is not transmitted to the link lever 13 while the engagement pin 11a provided on the drive lever 11 moves in the arc portion of the link groove 13a formed in the link lever 13, the first door 6 is Does not work. After that, the engagement pin 11a of the drive lever 11 is connected to the link groove 13a.
When the movement of the arc portion of the first end is completed, the rotation of the drive lever 11 is transmitted to the link lever 13 while the engagement pin 11a engages with the link groove 13a, and the first door 6 starts operating (FIG. 5). Point A).

The operating angle of the first door 6 is determined according to the vehicle speed after the inside / outside air switching door 5 closes the inside air introduction port 2 (in the outside air mode). In other words, when the vehicle is stopped (in this case, no running pressure is generated),
It operates up to the set maximum operating angle (the right end position in FIG. 5), and when the vehicle is traveling, it operates up to the operating angle according to the vehicle speed at that time. Regarding the relationship between the vehicle speed and the operating angle, the operating angle of the first door 6 decreases as the vehicle speed increases. Speaking of the graph of FIG. 5, the vehicle is stopped at the right end position of the graph, that is, the vehicle speed =
0, the vehicle speed increases toward the left side of the graph,
The time point when the inside / outside air switching door 5 closes the inside air inlet 2 (point B in FIG. 5) is set as the maximum speed.

The second door 7 starts to operate after the inside / outside air switching door 5 closes the inside air inlet 2 after the first door 6 starts to operate. That is, even if the first door 6 is operated and the operating lever 14 is rotated integrally with the support shaft 6a, the engaging pin 14a provided on the operating lever 14 is an arc of the link groove 16b formed on the intermediate lever 16. While moving the parts, the rotation of the operating lever 14 is not transmitted to the intermediate lever 16, so that the second door 7 does not operate. After that, the operating lever 1
When the engaging pin 14a of No. 4 has finished moving in the arc portion of the link groove 16b, the rotation of the operating lever 14 is transmitted to the operating lever 15 via the intermediate lever 16 while the engaging pin 14a engages with the link groove 16b. As a result, the second door 7 starts operating (point C in FIG. 5). When the second door 7 starts to operate, the inside / outside air switching door 5 has already closed the inside air introduction port 2.

After the operation of the second door 7 starts at point C in FIG. 5, the operating angle is determined according to the vehicle speed at that time. That is, when the vehicle is stopped (in this case, no traveling pressure is generated), the vehicle operates up to the set maximum operating angle (the right end position in FIG. 5), and when the vehicle is traveling, the vehicle at that time is operated. Operates up to an operating angle according to speed. Therefore, when the vehicle speed at that time is higher than the vehicle speed when the second door 7 starts operating (for example, at the maximum speed), the second door 7 does not operate even in the outside air mode.

1 to 4 show the operating states of the doors 5, 6 and 7 when the inside air mode is switched to the outside air mode. Figure 1 shows the state of each door 5, 6, and 7 in the inside air mode.
Shown in. That is, the inside / outside air switching door 5 closes the outside air inlet 3, and the first door 6 and the second door 7 are each at the minimum opening degree. In the graph of FIG. 5, each door 5, 6,
7 is located at each minimum operating angle (left end position in FIG. 5). Each door 5 when the vehicle is running at maximum speed,
The states of 6 and 7 are shown in FIG. At this point, the opening degree of the first door 6 is larger than that in the inside air mode, but the second door 7 is not operating (that is, the opening degree is the same as that in the inside air mode). In the graph of FIG. 5, the doors 5, 6, and 7 are located at the operating angle on the straight line passing through the point B.

FIG. 3 shows the states of the respective doors 5, 6 and 7 when the vehicle is traveling at a speed lower than the maximum speed (however, the speed at which the second door 7 starts to move). At this point, the first
Although the opening degree of the door 6 is further increased, the second door 7 is not operating (that is, the opening degree is the same as in the inside air mode).
In the graph of FIG. 5, the doors 5, 6, and 7 are located at the operating angle on the straight line passing through the point C. FIG. 4 shows the states of the doors 5, 6, and 7 when the vehicle is stopped. At this point,
The opening degrees of both the first door 6 and the second door 7 are maximum.
In the graph of FIG. 5, the doors 5, 6, and 7 are located at their respective maximum operating angles (right end positions in FIG. 5).

(Effect of this embodiment) According to this embodiment, the ram pressure adjusting doors 6 and 7 are constituted by the first door 6 and the second door 7, and the first door 6 and the second door 7 are formed. The door 7 can be driven in different movements via the second link mechanism. In other words, by opening the second door 7 when the opening degree of the first door 6 becomes large, the area where the ram pressure control air volume can be linearly controlled by the first door 6 is followed by the second door 7. Since the area in which the ram pressure control air volume can be linearly controlled by the door 7 can be obtained, the ram pressure control air volume can be linearly controlled over the entire door opening as shown in FIG. Further, this enables fine control on the control side. Further, in this embodiment, the ram pressure adjusting doors 6 and 7 are composed of the first door 6 and the second door 7, so that the operating space can be made smaller than that of the conventional single door. The restrictions on the layout are also reduced.

(Modification) In the above embodiment, the first door 6 is used.
And the second door 7 is operated as shown in FIG. 5, but the operation start timing of each door 6, 7 or each door 6, 7
The operating speed of may be changed appropriately. For example, each door 6,
The operation start timing of 7 may be the same, and the operation speed of each door 6, 7 may be different, or the operation start timing of each door 6, 7 may be different, and the operation speed of each door 6, 7 is the same. You can In the above embodiment, an example in which the first door 6 and the second door 7 are driven by one actuator 8 by using the first link mechanism and the second link mechanism has been described, but the link mechanism is used. Alternatively, the first door 6 and the second door 7 may be driven by dedicated actuators. Also, the ram pressure adjusting door may be two or more.

[Brief description of drawings]

FIG. 1 is a side view showing an operating state of each door (in an inside air mode).

FIG. 2 is a side view showing an operating state of each door (when traveling at maximum speed).

FIG. 3 is a side view showing an operating state of each door (when the second door starts to move).

FIG. 4 is a side view showing an operating state of each door (when the vehicle is stopped).

FIG. 5 is a diagram showing a relationship between an operating angle of a link mechanism and an operating angle of each door.

FIG. 6 is a diagram showing a relationship between a door opening and a ram pressure control air volume.

FIG. 7 is a diagram showing a relationship between a door opening degree and a ram pressure control air volume (conventional example).

[Explanation of symbols]

1 Inside / outside air switching device 2 Inside air inlet 3 Outside air inlet 5 Inside / outside air switching door 6 First door (ram pressure adjustment door) 6a First door support shaft (rotating shaft) 7 Second door (ram pressure adjustment door) 7a Second door support shaft (rotating shaft) 8 Actuator (driving means) 10 Drive lever (first link mechanism) 11 Drive lever (first link mechanism) 12 Link lever (first link mechanism) 13 Link lever (first link mechanism) 14 Actuating lever (second link mechanism) 15 Actuating lever (second link mechanism) 16 Intermediate lever (second link mechanism)

─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Isao Kinoshita 1-1, Showa-cho, Kariya city, Aichi Prefecture DENSO CORPORATION (56) References JP 63-64814 (JP, A) JP 60-261720 (JP, A) JP-A-61-94407 (JP, A) Actually opened 2-133913 (JP, U) Actually opened 60-20908 (JP, U) Actually opened 5-84513 (JP, U) ( 58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/00-3/06 F24F 13/00-13/18

Claims (5)

(57) [Claims] 1. An inside / outside air switching device for selectively opening and closing an inside air introduction port and an outside air introduction port by an inside / outside air changeover door, wherein the inside / outside air changeover door closes the inside air introduction port and opens the outside air introduction port. A ram pressure adjusting door that changes the opening ratio of the outside air introduction port when in the mode, and a drive unit that drives the ram pressure adjusting door according to the vehicle speed, and the ram pressure adjusting door is a plurality of doors. The ram pressure adjusting mechanism for a vehicle air conditioner, wherein the drive means drives the plurality of doors with different movements. 2. The ram pressure adjusting mechanism for a vehicle air conditioner according to claim 1, wherein the driving means drives the plurality of doors at different operation start timings. 3. The ram pressure adjusting mechanism for a vehicle air conditioner according to claim 1, wherein the drive means drives the plurality of doors at different operating speeds. 4. The driving means comprises a link mechanism for connecting the plurality of doors, and drives the plurality of doors with different movements via the link mechanism. A ram pressure adjusting mechanism for a vehicle air conditioner according to any one of 3 to 3. 5. The ram pressure adjustment for an air conditioner for a vehicle according to claim 1, wherein each of the plurality of doors is a butterfly door having a rotating shaft provided at a central position. mechanism.