JPH05113243A - Damper device - Google Patents

Abstract

PURPOSE:To provide a damper device which ensures comfortable operation feeling by reducing the driving load of damper operation in either opening direction or closing direction of the damper. CONSTITUTION:A damper 2 for opening and closing an air blowoff port 1a of a case 1 is pivotally supported about a fulcrum 3. A lever 8 which rotate with the damper 2 has an elongate hole 8a extending in the axial direction thereof. A groove frame body 6 fixed to the case 1 has a straight groove 16a and an arcuate groove 16b. The hole 8a and the groove 16a or the groove 16b slidably guide a pin 5. One end 10a of a tension spring 10 is rotatably mounted to the pin 5 and the other end 10b thereof is attached to the center of a circle of the groove 16b. In this manner, when the damper is completely closed, the spring 10 causes energizing forces to resist air pressure acting on the damper 2 and when the damper is fully opened, the spring 10 imparts energizing forces to the damper so as to resist reverse air pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device, for example, a link cam mechanism for opening and closing a heat damper of an automobile air conditioner.

[0002]

2. Description of the Related Art Conventionally, a damper device for switching a harmonized air flow in an automobile air conditioner prevents an operating force when opening and closing the damper, that is, a lever driving load from increasing due to the influence of wind pressure and the like. To make the operation feeling comfortable when opening and closing the damper, a coil spring is provided to reduce the lever drive load.

[0003]

However, according to such a conventional damper device, the driving load when the damper rotates in the direction to receive the wind pressure can be reduced, but the damper does not receive the wind pressure. There is a problem that the coil spring acts in the opposite direction when it is rotated to, and the driving load is increased, so that the operating force is increased.

The present invention has been made in order to solve such a problem, and by varying the spring load according to the damper position, the driving load can be applied in either the opening direction or the closing direction of the damper. It is an object of the present invention to provide a damper device that reduces the noise and ensures a comfortable operation feeling.

[0005]

SUMMARY OF THE INVENTION A damper device according to the present invention for solving the above-mentioned problems includes a damper rotatably supported around a rotation shaft for opening and closing an air flow path of a case, and the damper. A lever having an elongated hole extending in the direction of the lever axis, and a groove frame body fixed to the case, having a linear groove and an arc groove, A hole and a pin slidably guided and fitted in the straight groove or the arc groove, and an elastic means having one end rotatably attached to the pin and the other end attached to a circular center position of the arc groove. There is provided elastic means for urging the damper in the opening direction when the damper is fully closed and for urging the damper in the closing direction when the damper is fully opened.

[0006]

According to the damper device of the present invention, when the damper is fully closed,
The elastic means exerts an urging force so as to oppose the wind pressure acting on the damper, and when the damper is fully opened, the elastic means exerts the urging force on the damper so as to oppose the reverse wind pressure. Therefore, when the damper is fully closed, the operating force is small, and even when the damper is fully opened, the operating force in the opposite direction is smaller than that in normal operation.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. An embodiment in which the present invention is applied to a heat damper of a car air conditioner is shown in FIGS. As shown in FIG. 1, a case 1 is formed with an air outlet 1a for circulating air, and a damper 2 for opening and closing the air outlet 1a is rotatably provided around a fulcrum 3. A link mechanism (not shown) for transmitting a damper operating force is connected to the fixed pin 2a formed at one end of the damper 2. Further, the groove frame body 6 and the bush 7 are fixed to the case 1.

A long lever 8 is attached to the fulcrum 3 of the damper 2.
One end of is fixed. The lever 8 is formed with an elongated hole 8a which extends in the longitudinal direction and into which the pin 5 is slidably fitted. The tension spring 10 has one end 10
A is rotatably assembled to the pin 5, and the other end 10b is rotatably assembled to the bush 7.

The groove 16 formed in the groove frame 6 fixed to the case 1 has a linear groove 16a and an arc groove 16b. The linear groove 16a is formed so as to extend in a direction slightly offset from the axial direction of the tension spring 10. The circular arc groove 16b is formed along a concentric circular arc shape whose center is the center of the bush 7. Tension spring 1
The biasing force of 0 acting on the damper 2 has a characteristic as shown in FIG. 5, for example. That is, when the pin 5 at the fully closed position is in the A position shown in FIG. 1, the damper 2 receives wind pressure in the direction of the arrow shown in FIG. 1, but at this time, the damper 2 opens in the opening direction of the tension spring 10. Power acts.

When the opening of the damper 2 increases from the position A, the urging force of the tension spring 10 in the opening direction gradually decreases, and eventually the urging force of the tension spring 10 switches from the opening force to the closing force. Then, when the pin 5 comes to the position B shown in FIG. 3, a small closing force of the tension spring 10 acts on the damper 2. Next, from the B position to the C position shown in FIG. 4, since the total length of the tension spring 10 is constant at l ₂ , as shown in FIG. 5, the damper 2 is fixed between the B position and the C position. The small closing force of is applied.

When the pin 5 in the fully open position is in the C position shown in FIG. 4, a back wind pressure acts on the opposite surface 2b of the damper 2.
In this state, the tension spring 10 exerts a small closing force on the damper 2. Therefore, when the damper 2 moves in the closing direction from the fully open position, a small operation force is required to drive the damper 2. Therefore, when the damper 2 is at the fully closed position, the damper 2 can be driven in the opening direction with a relatively small operating force even if the wind pressure shown in FIG. 1 acts.
Further, when the damper 2 is to be closed from the fully open position, the damper 2 can be driven by a relatively small required operation force on the open side. Thus, in any range of the opening from the damper fully closed to the fully open, the tension spring 10 applies a variable load that cancels the operating force due to the wind pressure at that position.
Since the damper 2 is supplied to the damper 2 by a relatively small operating force from a link mechanism (not shown).
Can be rotated.

A second embodiment of the present invention is shown in FIGS. 6 and 7. The second embodiment is a tension spring 1 shown in the first embodiment.
This is an example in which a string spring 20 is provided instead of 0. String spring 2
One end 20a of 0 is rotatably attached to the pin 5, and the other end 20b is rotatably attached to the bush 7. As shown in FIG. 7, for example, the urging force of the coiled spring 20 causes the coiled spring 20 to exert an urging force in the damper closing direction when the damper 2 is fully closed. Then, between the position A and the position B, the opening direction force of the coiled spring 20 gradually decreases as the opening degree of the damper 2 increases, and the closing direction force is applied to the damper 2 by switching in the middle. And B
From the position to the C position, both ends 20a of the helical spring 20 are
And the distance l ₂ between 20b and 20b is constant, the helical spring 20 exerts a constant small force in the damper closing direction on the damper 2.
In the fully opened position of the damper, a reverse wind pressure acts, but when the damper 2 is driven from this fully opened state, the small closing force of the coiled spring 20 acts on the damper 2.
It requires only a small amount of operating force to drive the.

Next, a third embodiment of the present invention will be described with reference to FIGS. 8 and 9.
Shown in. The third embodiment is an example in which the tension spring 10 and the helical spring 20 used in the first and second embodiments are used together. The urging force of the elastic means of this example has the characteristics shown in FIG. 9, but in this case, the force against the wind pressure is applied to the damper mainly by the tension spring 10 when fully closed, and mainly by the urging force of the coiled spring 20 when fully opened. By applying a closing direction force to the damper 2, the necessary operating force for driving the damper is reduced over the entire damper opening.

As shown in the above embodiments, the operating force of the damper can be reduced in the entire range from the fully closed position to the fully opened position of the damper, so that the operation feeling when opening and closing the damper is good and comfortable. There is an effect that operability is obtained.

[0015]

As described above, according to the damper device of the present invention, the elastic means applies the urging force to the damper in the direction of canceling the influence of the wind pressure on the damper when the damper is opened and closed. The required drive load can be reduced in the entire range from the damper fully open to the damper fully closed, and the required operating force of the damper can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a fully closed state of a damper device according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the pin shown in FIG. 1 and its surroundings.

FIG. 3 is a schematic configuration diagram showing a middle open state of the damper device according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a fully open state of the damper device according to the first embodiment of the present invention.

FIG. 5 is a characteristic diagram of elastic means according to the first embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a fully closed state of a damper device according to a second embodiment of the present invention.

FIG. 7 is a characteristic diagram of elastic means according to a second embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a fully closed state of a damper device according to a third embodiment of the present invention.

FIG. 9 is a characteristic diagram of elastic means according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Case 1a Air blowout port (air flow path) 2 Damper 3 Support point (rotating shaft) 6 Groove frame body 7 Bushing (circle center position) 8 Lever 8a Slotted hole 10 Tensile spring (elastic means) 16a Straight groove 16b Circular groove 20 20 String winding Spring (elastic means)

Claims (1)

[Claims] 1. A damper, which is rotatably supported about a rotation shaft to open and close an air flow path of a case, and a lever which rotates integrally with the damper about the rotation shaft. A lever having an elongated hole extending in the axial direction, a groove frame body fixed to the case and having a linear groove and an arc groove, and slidably guided and fitted in the elongated hole and the linear groove or the arc groove. And elastic means having one end rotatably attached to the pin and the other end attached to the circular center position of the circular arc groove, and biases in the damper opening direction when the damper is fully closed, and when the damper is fully opened. A damper device, comprising: elastic means set to urge the damper in a closing direction.