JPH0669782B2 - Damper drive device for automobile air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper drive device for an air conditioner for a vehicle, which controls cold air and hot air blown into a vehicle compartment and distributes them to each air outlet.

2. Description of the Related Art In recent years, in air conditioners for automobiles, it has been required that a damper that controls the opening and closing of a ventilation passage closes the ventilation passage to provide an area for ensuring airtightness.

A conventional air conditioner for an automobile will be described by taking a mix link for controlling a blowout temperature of a heater unit as an example. For example, a link mechanism for rotating a mix damper as shown in Japanese Utility Model Laid-Open No. 60-113211 is shown in FIG. In addition, the relationship of the mix damper rotation position with respect to the mix lever position for driving the link mechanism is as shown in FIG.

That is, in the heater case 1 which constitutes the ventilation passage as the main body of the heater unit, the heater core 2 and the mix damper 3 for controlling the blowout temperature by switching the ventilation passage are mounted via the damper shaft 4 serving as the rotation center. A crank 5 is attached to one end of the damper shaft 4, and a rod 7 attached to a mix lever 6 for rotating the mix damper 3 is connected to the crank 5 via a holder 8 to form a mix link mechanism. The connection between the rod 7, the holder and 8 is positioned by the fitting protrusion 9. A control cable 10 connected to a temperature adjusting lever (not shown) is connected to the mix lever 6.

Therefore, by operating the mix lever 6 which is the drive lever of the mix link mechanism from the a position to the two position,
The mix damper 3 is adapted to open proportionally from the COLD position to the HOT position.

Problems to be Solved by the Invention However, in the conventional configuration, the mix lever 6
If you slightly move both sides of the operating range, that is, positions I and D, the mix damper 3
Since it is a link mechanism that starts rotating immediately from the HOT position, there were the following problems.

The mix damper 3 closes the ventilation path to the heater core 2 to obtain the maximum cold air temperature at the COLD position or the heater core 2
It is necessary to always position the mix lever 6 at the a position or the d position so that the ventilation passages other than the above are closed and held at the HOT position for obtaining the maximum warm air temperature. However, after connecting the control cable 10 to the mix lever 6, the position of the mix lever 6 may deviate from the a position or the 2 position.

In this case, since the mix lever 6 is slightly moved from the A / D position, the mix damper 3 is cold / hot.
Since it starts rotating immediately from the position, the ventilation passage cannot be completely closed and cold air or temperature circulates, and the closed airtightness of the mix damper 3 decreases, and the original maximum cooling performance or maximum heating performance cannot be obtained. There was a problem.

Therefore, in view of the above problems, the present invention is suitable for the position of the drive lever so that the damper can be held on both sides of the rotation range even if the drive lever for rotating the damper makes a slight movement on both sides of the operation range. Provided is a damper drive device for an air conditioner for a vehicle, which is provided with a wide play area so that the maximum cooling performance or the maximum heating performance can always be obtained.

Means for Solving the Problems In order to solve the above problems, an automobile air conditioner of the present invention is mounted on a drive lever for rotating a damper and one end of a damper shaft which is a center of rotation of the damper. An elastic body such as a coil spring for urging sliding at the connecting portion is provided at a crank-side connecting portion of a rod for slidingly connecting to the crank.

Operation According to the present invention, even if the drive lever for rotating the damper slightly moves on both sides of the operating range, the present invention has the crank side of the rod connecting the drive lever and the crank attached to one end of the damper shaft. The elastic body provided in the connecting portion expands and contracts to absorb the rattling, and the spring force of the elastic body always acts to urge the damper to both sides of the rotation range. It can be held in a stable state on both sides.

As a result, the drive levers are provided with play areas on both sides of the operation range that do not affect the rotation of the damper, so that the control cable can be easily connected without adjustment and the damper that controls the opening and closing of the ventilation passage is provided. It is possible to continue to block the ventilation passage and provide an area where airtightness can be ensured.

Example Hereinafter, one example of the present invention will be described with reference to the accompanying drawings by taking a mix link device of a heater unit as an example.

In FIG. 3, 11 is a heater case that constitutes a ventilation passage as the main body of the heater unit, and has an upper outlet 12 that blows cold air to the upper half of the occupant, a lower outlet 13 that blows warm air to the feet of the occupant, and a window. Defroster outlet 14 that guides warm air to the glass
Further, the suction port 15 for sucking outside air or cold air is integrally formed. Further, in the heater case 11, a heater core 16 for heating the outside air or cold air sucked in through the suction port 15,
A mix damper 17 for controlling the outlet temperature by switching the ventilation passage between the outside air or the cold air to the heater core 16 passing direction and directly to the upper outlet 12 direction, and a vent damper 18 and a diff damper 19 for opening and closing the ventilation passage and distributing the air volume. It is attached via the damper shafts 20, 21, and 22 that are the center of rotation of. The mix link device for rotating the mix damper 17 includes a mix lever 23 which is a drive lever of the mix link device mounted on the heater case 11, and a crank 2 for integrally rotating the mix damper 17 mounted on one end of the damper shaft 20.
4, holder attached to the crank 25, mix lever 23
A rod 26 slidably connected to a crank 24 attached to a holder 25 via a holder 25, and two coil-like elastic bodies 27a having spring properties located on both sides of the holder 25 which is telescopically fitted into the rod 26.・ Consists of 27b and details are shown in Fig. 1 ・
It is shown in FIG. The elastic bodies 27a and 27b have their one ends regulated in position by projections 28 formed on the rod 26. A control cable 29 connected to a temperature adjusting lever (not shown) is connected to the mix lever 23.

The operation of the heater unit mix link device configured as described above will be described below with reference to FIGS. 1, 2 and 4.

FIG. 1 shows the mix link state in which the mix damper 17 is closed in the passage direction of the heater core 16 and is in the COLD position where the maximum cold air temperature for directly introducing the outside air or the cold air to the upper air outlet 12 is obtained. Here, the mix lever 23 is at a position on one end side of the operation range, the elastic body 27b telescopically fitted on the rod 26 is in a compressed state, and the spring force of the elastic body 27b causes the mix damper 17 to be on one end side of the rotation range. That is, it is biased and held in the COLD position. Then, while the mix lever 23 moves to the position b, that is, while the spring force of the elastic body 27b is acting, the mix damper 17 does not rotate and the CO
It means that the LD position is kept biased.

Next, in FIG. 2, contrary to FIG. 1, the mix damper 17 blocks the ventilation passages other than the heater core 16, guides the outside air or cold air in the passage direction of the heater core 16, and is heated by the heater core 16 to obtain the maximum warm air temperature. It shows the mix link status in the HOT position. Here, the mix lever 23 is at the second position on the other end side of the operation range, the elastic body 27a that is telescopically fitted to the rod 26 is in a compressed state, and the spring force of the elastic body 27a causes the mix damper 17 to rotate in other ranges. It is biased and held at the end side, that is, the HOT position. Then, while the mix lever 23 moves to the c position, the mix damper 17 does not rotate as in FIG. 1 and continues to be biased and held at the HOT position.

FIG. 4 is a rotation characteristic diagram of the mix damper 17 with respect to the position of the mix lever 23, which represents the above operating state. As a result, since play areas that do not affect the rotation of the mix damper 17 are provided on both sides of the operation range of the mix lever 23, even if the mix lever 23 is slightly moved on both sides of the operation range, the mix damper 17 ventilates. Since the passage is kept closed, it is possible to prevent the airtightness from deteriorating, and there is no problem that the original maximum cooling performance or maximum heating performance cannot be obtained.

It goes without saying that such a configuration can be applied not only to the mix damper but also to a portion having a similar link mechanism.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiments, in the present invention, in the link structure for rotating the damper, the drive lever for rotating the damper and the one end of the damper shaft which is the center of rotation of the damper are attached. By inserting an elastic body having a spring property into the crank side connecting portion of the rod connecting the crank and causing the spring force of the elastic body to urge the damper to both sides of the rotation range, the drive lever is moved. Even if a small movement is made on both sides of the operating range, the damper can be held on both sides of the rotation range, and the damper that controls the opening and closing of the ventilation passage should keep the ventilation passage closed to ensure airtightness. You can Since the drive lever is provided with play areas on both sides of the operation range that do not affect the rotation of the damper, it is possible to eliminate the adjustment when connecting the control cable to the drive lever, thus improving the assembly workability. .

[Brief description of drawings]

FIG. 1 is an enlarged side view of an essential part of a heater unit in an air conditioner for an automobile showing an embodiment of the present invention, and FIG. 2 is an enlarged side view of an essential part of the heater unit in an operating state different from that of FIG. FIG. 3 is a side view of the same heater unit, FIG. 4 is a mix damper rotation characteristic diagram with respect to the mix lever position shown in FIGS. 1 and 2, and FIG. 5 is a main part of a heater unit showing a conventional example. FIG. 6 is an enlarged side view and FIG. 6 is a mix damper rotation characteristic diagram for the mix lever position shown in FIG. 11 …… Heater case, 12 …… Upper outlet, 13 …… Lower outlet, 14 …… Defroster outlet, 15 …… Suction inlet, 16…
… Heater core, 17 …… Mix damper, 23 …… Mix lever, 24 …… Crank, 26 …… Rod, 27a ・ 27b ……
Elastic body.

Claims (1)

[Claims] 1. A crank is attached to a shaft of a damper for controlling air flow distribution or blowout temperature by switching ventilation passages, a drive lever for rotating the damper is attached to a case constituting the ventilation passage, and the drive lever is provided with A damper drive device for an air conditioner for an automobile, comprising a rod slidably connected to a holder attached to a crank, and an elastic body having one end fixed to the rod and exerting a biasing force on the holder.