JPS6239923Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lever device mainly used for moving a door in an automobile air conditioner.

As a lever device of this type, one is already known that has a main lever to which an operating force is applied, and a sub-lever that slides into contact with the main lever, and is operated by connecting a door to the sub-lever. (For example, Japanese Utility Model Application Publication No. 53-82166) In FIG. 1, a specific example of the above-mentioned lever device is shown, and the main lever 1 and the sub-lever 2 are rotatable to the air conditioning case 3 via the support shafts 4 and 5. The main lever 1 has three arms 1.
a, 1b, and 1c are formed. One end of the operating wire 6 is locked to one of the three arms 1a, 1b, and 1c, and a door 8 for a heater mode that opens and closes the lower air outlet passage 10 is connected to the other arm. Furthermore, an engaging protrusion 19 is protruded from the other one, and this engaging protrusion 19 engages with a groove-shaped cam surface 20 formed on the sub-lever 2. On the other hand, a vent mode door 16 that opens and closes the upper outlet passage 18 is connected to the arm 2b of the sub-lever 2. Therefore, when the main lever 1 is rotated clockwise in the heater mode as shown in the figure, the point of application G of the force between the engagement protrusion 19 and the bent portion 20c of the cam surface 20 is Since the main lever 1 presses the sub-lever 2 through the engagement protrusion 1
The sub-lever 2 is rotated counterclockwise while the lever 9 is in sliding contact with the cam surface 20, and the door 16 is gradually opened.

However, even though the door 16 is perpendicular to the air blowing direction and receives maximum air pressure, the distance La from the center of the support shaft 4 of the main lever 1 to the point of application G and the sub lever Since the lever ratio shown by the ratio Lb/La to the distance Lb from the center of the support shaft 5 in No. 2 to the point of action G is small,
The operating force applied to the main lever 1 had to be extremely large just at this moment. This situation also applies to cases where the door 16 is provided with a spring or other external force other than wind pressure changes depending on the degree of opening of the door 16, resulting in poor operability.

This idea arises from the fact that when the door to be operated receives external forces such as wind pressure that change depending on its opening degree, the lever ratio between the main lever and the sub-lever is only uniquely determined. It is an object of the present invention to provide a lever device that eliminates the problem of having to vary the operating force greatly, allows the door to be operated with an average operating force over the entire operating range, and has good operability. It is said that The most distinctive feature of this invention is that at least two sets of engaging protrusions and cam surfaces are provided on the main lever and the sub-lever at different distances from the center of rotation and that can slide into contact with each other.
The plurality of sets of engagement protrusions and cam surfaces are arranged so that as the main lever rotates, the point of application of force from the main lever to the sub-lever opposes the external force received by the door. The reason is that I decided to move. Therefore, since the point of application of the force moves to counteract the external force that the door receives, the lever ratio can be increased when the external force that the door receives is large, and the operating force applied to the main lever can be small. Therefore, the operating force is averaged over the entire range, and the above-mentioned problem can be achieved.

Examples of this invention will be described below with reference to the drawings.

An embodiment of this invention is shown in FIGS. 2 to 6, in which a main lever 1 and a sub-lever 2 are rotatably supported on the side surface of an air conditioning case 3 via support shafts 4 and 5. .

The main lever 1 includes, for example, three arms 1a,
1b and 1c, and one end of an operating wire 6 that transmits an operating force to one arm 1a is locked, and an operating force is applied manually or from an operating force source such as a servo motor via this operating wire 6. , is adapted to be rotated about a support shaft 4 as a rotation center.
Further, the other arm 1b is connected via a rod 7 to a fixed lever 9 fixed to a rotating shaft 8a of a door 8 for heater mode. is air conditioning case 3
The lower air outlet passage 10 formed in the air conditioning case 3 is opened and closed by being rotatably supported by the lower air outlet passage 10 formed in the air conditioning case 3. Further, the other arm 1c is provided with two engaging protrusions 11, 12 projecting at different distances from the center of rotation of the main lever 1.
Sub-lever 2 in which one or both of the following
The main lever 1 is in sliding contact with the cam surfaces 13 and 14 of the main lever 1 to transmit the rotational force of the main lever 1 to the sub lever 2. Note that the engagement protrusion 12 on the near side can also be formed by being bent integrally with the main lever 1.

The cam surfaces 13 and 14 are formed on the cam surface forming portion 2a of the sub-lever 2 so as to correspond to the engaging protrusions 11 and 12 and form two groups, a first group and a second group. The cam surface 13 with which the engagement protrusion 11 on the tip side engages is formed in a groove shape, and the engagement protrusion 11 is formed on both sides of the cam surface 13 from the center of rotation of the main lever 1.
Arc parts 13a, 13b whose radius is the distance to
and the bent portion 13 between the arcuate portions 13a and 13b.
It is composed of c. Further, the cam surface 14 with which the engagement protrusion 12 on the front side engages is formed on the periphery of the cam surface forming part 2a of the sub-lever 2, and as shown in FIGS. 3 and 4, the engagement protrusion on the distal side 11 slides into contact with the cam surface 14 only in a partial section while passing through the bent portion 13c of the cam surface 13. Therefore,
Before and after this section, the point of application G of the force from the main lever 1 to the sub lever 2 is between the engagement protrusion 11 and the cam surface 1.
The point of force application Ga in the first set with 3,
It moves between the force application point Gb in the second pair formed by the engagement protrusion 12 and the cam surface 14.

Further, the sub-lever 2 has, for example, one arm 2b, and a rotary shaft 16a of the door 16 for vent mode is connected to this arm 2b via a rod 15.
It is connected to a fixed lever 17 fixed to
This vent mode door 16 has its rotation axis 1
6a is rotatably supported by the air conditioning case 3 to open and close an upper outlet passage 18 formed in the air conditioning case 3.

In the above configuration, as shown in FIG. 2, when the operating wire 6 is pulled and the main lever 1 is in the most counterclockwise position, the heater mode door 8 closes the lower outlet passage 10 and is not engaged. The mating protrusion 11 is at the end of the arc portion 13a of the cam surface 13, and the vent mode door 16 closes the upper outlet passage 18.
Furthermore, a defrost outlet (not shown) is opened to put the air conditioner into defrost mode.

Now, when the operating wire 6 is pressed and the main lever 1 is rotated by a certain angle clockwise, the rotational force is transmitted to the heater mode door 8 via the rod 7 and fixed lever 9, and the door 8 is rotated counterclockwise. direction, and the lower outlet passage 10 is opened. On the other hand, as the main lever 1 rotates, the engagement protrusion 11 also rotates, but since it only slides on the circular arc portion 13a of the cam surface of the sub-lever 2, the rotational force of the main lever 1 is not transmitted to the sub-lever 2, and the vent The mode door 16 closes the upper outlet passage 18 as it is, and the engagement protrusion 12 on the front side comes into contact with the cam surface 14, and the mode is switched to the heater mode as shown in FIG. At this time, the defrost outlet (not shown) is closed leaving a slight gap.

Furthermore, when attempting to rotate the main lever 1 counterclockwise by a certain angle, the vent mode door 1
Since it is perpendicular to the wind pressure that 6 receives,
The resistance received by the sub lever 2 is large. However, since there is a force application point Gb on the pair of the engagement protrusion 12 and the cam surface 14 on the front side, the lever ratio at this time is from the center of the support shaft 4 of the main lever 1 to the application point Gb.
The ratio Ld/Lc of the distance Lc to Gb and the distance Ld from the center of the support shaft 5 of the sub-lever 2 to the point of action Gb is large. Therefore, even if the operating force W applied to the main lever 1 is small, it is transmitted to the sub-lever 2 as a large force, so that it can sufficiently counter the resistance that the door 16 receives. When the sub-lever 2 rotates a certain angle counterclockwise in conjunction with the rotation of the main lever 1, the vent mode door 16 rotates counterclockwise and the upper air outlet passage 18 is rotated, as shown in FIG. is opened approximately half, and the engagement protrusion 11 on the distal end side reaches the point of application Ga of the force formed by the bent portion 13c of the cam surface 13. Therefore, if you rotate main lever 1 any further,
The point of force application moves from the previous point of application Gb to the next point of application Ga, and the lever ratio at this time is the distance Le from the center of the support shaft 4 of the main lever 1 to the point of application Ga.
and the point of action Ga from the center of the support shaft 5 of the sub-lever 2
Although the ratio Lf/Le of the distance Lf to the main lever 1 decreases, the wind pressure applied to the door 16 decreases, so there is no need to change the operating force W applied to the main lever 1 that much. Finally, the door 16 for the vent mode fully opens the upper outlet passage 18, and the door 8 for the heater mode hardly rotates as the fixed lever 7 passes near the consideration point, and therefore, as shown in FIG. The mode is switched to bi-level mode as shown in .

When the main lever 1 is further rotated clockwise, the fixed lever 9 is rotated clockwise and the lower outlet passage 10 is closed, while the engagement protrusion 1 on the tip side
Since the operating force is not transmitted from the main lever 1 to the sub-lever 2 through the circular arc portion 13b of the cam surface 13, the mode is switched to the vent mode as shown in FIG.

The above has described the effect when switching from defrost mode to vent mode, but the operation is almost the same when switching from vent mode to defrost mode. However, in this case, there is no movement of the point of application of the force, and all the force is applied via the point of application Ga. Since the vent door 15 is about to close, the wind pressure applied to the door 15 becomes the rotational force of the sub-lever 2, and this is preferable.

In the above embodiment, the main lever 1 has the engaging protrusions 11 and 12, and the sub lever 2 has the cam surface 1.
3 and 14, respectively, but it goes without saying that in other embodiments they can be provided in reverse or separately, and three or more pairs of engagement protrusions and cam surfaces may be provided to apply the force in stages. It is also possible to move the point of action. Further, in the above embodiment, this invention was applied to the vent mode door 15 that receives wind pressure, but it can also be applied to the heater mode door 8 and other doors by providing a second sub-lever. It can also be applied to cases where external forces such as spring pressure change depending on the degree of opening of the door.

As described above, according to this invention, when the door to be operated receives an external force such as wind pressure that changes depending on its opening degree, the point of application of the force from the main lever to the sub lever is moved and the lever is moved. Since the ratio is changed, it is possible to operate the door with a small operating force even when the external force received by the door is large. On the other hand, when the external force is small, a correspondingly large operating force is required, and therefore the operating force can be averaged over the entire range, resulting in good operability. In addition, in the case of conventional sliding contact between a single engagement protrusion and a cam surface, if the cam surface is complex, a certain amount of play is required. Since the other engagement protrusion and the cam surface can be brought into sliding contact in between, play is reduced and operability is further stabilized.

[Brief explanation of drawings]

Fig. 1 is a side view showing a conventional door operating lever device, Fig. 2 is a side view showing the door operating lever device of this invention in defrost mode, and Fig. 3 is a side view of the same as above in heater mode. FIG. 4 is a side view of the same as above in an intermediate state between heater mode and bi-level mode, FIG. 5 is a side view of same as above in bi-level mode, and FIG. 6 is a side view of same as above in vent mode. 1...Main lever, 2...Sub lever, 1
1, 12... Engaging protrusion, 13, 14... Cam surface,
Ga, Gb...point of force application.

Claims (1)

[Scope of utility model registration request] In a door operating lever device that has a main lever to which an operating force is applied and a sub-lever that slides into contact with the main lever, and a door connected to the sub-lever receives an external force such as wind pressure that changes depending on the opening degree of the door. , the main lever and the sub-lever are provided with at least two pairs of engagement protrusions and cam surfaces that are slidably in contact with each other at different distances from the center of rotation, and the plurality of pairs of engagement protrusions and cam surfaces are provided with means for door operation, characterized in that as the main lever rotates, the point of application of force from the main lever to the sub-lever moves from one set to another so as to counteract the external force received by the door. lever device.