JP2008018886A - Link mechanism of vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress permanent deformation by a load, in a resin link mechanism. <P>SOLUTION: The link mechanism comprises a case 2 in which air flows into a cabin, a door 18 which is arranged in the case 2 to open/close an air passage 16 in the case 2, a link plate 24 to be turned by a driving device, a driven lever 20 coupled with a rotary shaft 18a of the door 18, groove parts 25, 34 formed in one member of the link plate 24 and the driven lever 20, and pin parts 2, 35 which are provided on the other member of the link plate 24 and the driven lever 20 and slidably fitted in the groove parts 25, 34. The other member is formed of a resin. Projection parts 28, 36 projecting toward the case 2 side are formed in the other member. Sliding parts 29, 37 with the projection parts 28, 36 slidably brought into contact therewith when at least the door 18 fully closes the air passage 16 are formed in the case 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a link mechanism that transmits driving force of a driving device to an air passage opening / closing door of a vehicle air conditioner.

  Conventionally, this type of link mechanism is described in Patent Document 1. In this prior art, a drive groove portion is formed in a link plate that is rotated by a drive force from a drive device, and a pin portion of the driven lever is slidably fitted, so that the rotational displacement of the driven lever is reduced. It is transmitted to an air passage opening / closing door to rotate the door.

  Further, in this prior art, when the door fully closes the air passage, the sealing member affixed to the door presses against the peripheral portion of the air passage and elastically compresses, thereby exhibiting sealing performance. Yes.

  In this prior art, the link mechanism (link plate and driven lever) is formed of a resin excellent in moldability.

On the other hand, as a link mechanism of this type, a resin-made link mechanism in which a drive groove portion is formed in a driven lever and a pin portion of a link plate is slidably fitted in the drive groove portion is commercialized.
JP 2004-340295 A

  By the way, in the former prior art, since the driven lever is formed of resin, it has a characteristic that the driven lever is likely to be permanently deformed when a large load is applied to the driven lever. The driving force from the link plate and the repulsive force of the elastically compressed seal member act on the pin portion of the driven lever in opposite directions.

  For this reason, a large load acts on the pin portion of the driven lever, and the driven lever is likely to be permanently deformed. In general, the vehicle air conditioner is exposed to a high temperature environment in the passenger compartment, but the permanent deformation of the driven lever is particularly likely to occur in such a high temperature environment.

  If such permanent deformation occurs, the seal member cannot be sufficiently pressed when the air passage is fully closed, and there is a problem that the sealing performance is deteriorated.

  On the other hand, in the latter prior art, since the driving force from the driving device and the repulsive force of the elastically compressed seal member act on the link plate pin portion in a direction opposite to each other, a large load is applied to the pin portion of the link plate. Acts and the link plate is likely to be permanently deformed. As a result, there is a problem that the sealing performance is lowered for the same reason as in the former prior art.

  As a countermeasure against these problems, it is conceivable to mold the link mechanism (link plate and driven lever) with a metal such as iron. However, this countermeasure deteriorates the moldability of the link mechanism (link plate and driven lever). There is a problem that the cost becomes high.

  In the former prior art, when the door rotates from the fully closed position toward the fully open position, the door and the driven lever move suddenly due to the repulsive force of the seal member. There is a problem in that an abnormal sound (acting sound called “comic”) is generated by colliding with the sliding surface.

  On the other hand, the latter prior art also has a problem that, for the same reason as the former prior art, the pin portion of the link plate collides with the sliding surface of the drive groove portion, and an abnormal noise (acting sound called squeal) is generated.

  An object of this invention is to suppress the permanent deformation by load in the link mechanism shape | molded with resin in view of said point.

  Another object of the present invention is to suppress the generation of noise due to the pin portion colliding with the sliding surface of the drive groove portion.

In order to achieve the above object, the present invention includes a case (2) in which air flows toward the passenger compartment,
A door (18) disposed in the case (2) for opening and closing the air passage (16) in the case (2);
A link plate (24) rotated by a drive device;
A driven lever (20) coupled to the rotating shaft (18a) of the door (18);
Groove portions (25, 34) provided in one of the link plate (24) and the driven lever (20);
A pin portion (26, 35) provided on the other member of the link plate (24) and the driven lever (20) and slidably fitted in the groove portion (25, 34);
The other member is molded of resin,
On the other member, protrusions (28, 36) protruding toward the case (2) side are formed,
The case (2) is formed with sliding portions (29, 37) with which the projecting portions (28, 36) slide and contact at least when the door (18) fully closes the air passage (16). This is the first feature.

  According to this, when the door (18) fully closes the air passage (16), the projecting portions (28, 36) are in sliding contact with the sliding portions (29, 37), so that they act on the other member. The load to be transmitted is transmitted to the case (2) through the protrusions (28, 36) and the sliding portions (29, 37).

  For this reason, it can avoid that the load which acts on the other member concentrates on the pin part (26, 35) of the other member. As a result, permanent deformation due to a load can be suppressed in the other member formed of resin.

The present invention also includes a case (2) in which air flows toward the passenger compartment,
A door (18) disposed in the case (2) for opening and closing the air passage (16) in the case (2);
A link plate (24) rotated by a drive device;
A driven lever (20) coupled to the rotating shaft (18a) of the door (18);
Groove portions (25, 34) provided in one of the link plate (24) and the driven lever (20);
A pin portion (26, 35) provided on the other member of the link plate (24) and the driven lever (20) and slidably fitted in the groove portion (25, 34);
On the other member, protrusions (28, 36) protruding toward the case (2) side are formed,
The case (2) has a second feature in that sliding portions (29, 37) with which the projecting portions (28, 36) are in sliding contact are formed.

  According to this, when the door (18) rotates from the fully closed position toward the fully open position, the projections (28, 36) of the other member slide with the sliding parts (29, 37) of the case (2). Due to the contact, a sliding frictional force is generated between the protrusions (28, 36) and the sliding portions (29, 37).

  For this reason, since it can suppress that the other member moves rapidly, it can suppress that the pin part (26, 35) of the other member moves rapidly with respect to the groove part (25, 34) of one member. As a result, it can suppress that the pin part (26, 35) of the other member collides with the groove part (25, 34) of one member, and an abnormal noise (acting sound called a click) is generated.

  Specifically, according to the present invention, the sliding portion (29) has at least the protrusion (28) when the door (18) starts rotating from the fully closed position of the air passage (16) toward the fully open position. It is formed so as to be in sliding contact with.

  As a result, when the door (18) rotates from the fully closed position toward the fully open position, the pin portions (26, 35) of the other member collide with the groove portions (25, 34) of the one member and generate abnormal noise ( It is possible to suppress the occurrence of a clicking sound.

Further, in the present invention, specifically, the groove portions (25, 34) are formed with inflection portions (25c, 34a) whose curvature radius changes,
The sliding portions (29, 37) are formed so as to be in sliding contact with the protruding portions (28, 36) when at least the pin portions (26, 35) pass through the inflection portions (25c, 34a). Yes.

  Thereby, when the pin part (26, 35) passes through the inflection part (25c, 34a), the pin part (26, 35) of the other member suddenly moves and the groove part (25, 34) of one member is moved. It is possible to suppress the generation of an abnormal noise (acting sound called “comic”) by colliding with the motor.

  Further, in the present invention, specifically, the sliding portions (29, 37) are formed in a shape extending along the operation locus of the protruding portions (28, 36) when the other member is displaced.

  Thereby, since the projections (28, 36) and the sliding portions (29, 37) can be satisfactorily brought into sliding contact, the projections (28, 36) and the sliding portions (29, 37) A sliding frictional force can be generated between them.

In the present invention, more specifically, the protrusions (28, 36) have a cylindrical shape,
The sliding portions (29, 37) have a groove shape that sandwiches the outer peripheral surface side of the columnar shape.

  Thereby, since the projections (28, 36) and the sliding portions (29, 37) can be reliably brought into sliding contact, the projections (28, 36) and the sliding portions (29, 37) A sliding frictional force can be reliably generated between them.

Further, in the present invention, specifically, the protrusion (28) is formed with a conical surface (33) whose diameter decreases from the other member side toward the case (2) side,
The conical surface (33) is in sliding contact with the sliding portion (29).

  According to this, the projecting portion (28) and the sliding portion (29) can be brought into sliding contact without fitting. For this reason, since the operation | work which fits a projection part (28) and a sliding part (29) is unnecessary when the other member is assembled | attached to case (2), the other member is assembled | attached to case (2). Workability is good.

  Further, according to the present invention, specifically, when the protrusion (28) contacts the sliding portion (29) and receives an external force from the sliding portion (29), the protrusion (28) is elastically deformed in the acting direction of the external force. Is formed.

  This stabilizes the sliding frictional force between the protruding portion (28) and the sliding portion (29) without being affected by the processing accuracy and assembly accuracy of the protruding portion (28) and the sliding portion (29). Can be generated.

Further, in the present invention, specifically, one member is the link plate (24),
The other member may be a driven lever (20).

Further, in the present invention, specifically, one member is a driven lever (20),
The other member may be a link plate (24).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a vehicle air conditioner 1 according to the present embodiment.

  An air upstream side portion of the case 2 forming the air flow path is provided with an inside air introduction port 3 for introducing vehicle interior air and an outside air introduction port 4 for introducing outside air, and these introduction ports. An inside / outside air switching door 5 that selectively opens and closes 3 and 4 is provided. Incidentally, the inside / outside air switching door 5 is opened and closed by a driving means such as a servo motor or by manual operation.

  Further, a filter (foreign matter removing means) 7 a and a blower 7 for removing dust in the air are arranged at the downstream side portion of the inside / outside air switching door 5, and the air is sucked from both the inlets 3 and 4 by this blower 7. The air is blown toward the respective outlets 14 to 16 described later.

  An evaporator 9 serving as an air cooling means is disposed on the air downstream side of the blower 7, and all the air blown by the blower 7 passes through the evaporator 9.

  The evaporator 9 is a low-pressure side heat exchanger of the vapor compression refrigerator, and exchanges heat between the decompressed low-pressure refrigerant and the air blown into the room and absorbs heat from the air blown into the room to evaporate the refrigerant. This cools the air blown into the room.

  Further, a heater 10 serving as an air heating means is disposed on the air downstream side of the evaporator 9, and the heater 10 heats air using waste heat generated in the vehicle such as cooling water of the engine 11 as a heat source. ing.

  The case 2 is provided with a bypass passage 12 that causes the cool air that has passed through the evaporator 9 to bypass the heater 10 and flow downstream, and the amount of warm air passing through the heater 10 is on the upstream side of the heater 10. An air mix door 13 for adjusting the air volume ratio with the cool air volume passing through the bypass passage 12 is disposed, and the temperature of the air blown into the room is adjusted by adjusting the air volume ratio between the warm air and the cold air. Incidentally, the air mix door 13 is opened and closed by driving means such as a servo motor or manual operation.

  Further, at the most downstream part of the case 2, a face outlet 14 for blowing conditioned air to the upper body of the passenger in the vehicle interior, a foot outlet 15 for blowing air to the feet of the passenger in the passenger compartment, a windshield, etc. And a defroster outlet 16 for blowing air toward the inner surface of the window glass. The defroster outlet 16 corresponds to an air passage in the present invention.

  And the blowing mode switching doors 17 and 18 are arrange | positioned in the air upstream site | part of each said blower outlets 14-16. More specifically, a face foot door 17 that switches between opening and closing the face air outlet 14 and the foot air outlet 15 and a defroster door 18 that opens and closes the defroster air outlet 16 are arranged. The defroster door 18 corresponds to the door in the present invention.

  Here, both the doors 17 and 18 are composed of cantilever doors in which rotary shafts 17a and 18a are integrally arranged at one end in the door length direction.

  FIG. 2 is a plan view showing a link mechanism 19 constituting a door operation mechanism for rotating both the doors 17 and 18. The rotary shafts 17a and 18a of the doors 17 and 18 are connected to a common electric actuator (not shown) via a link mechanism 19, and the doors 17 and 18 are operated in conjunction with the rotational power of the electric actuator. ing. The electric actuator corresponds to the driving device in the present invention.

  In FIG. 2, for convenience of illustration, only a portion of the link mechanism 19 that rotates the defroster door 18 is illustrated, and a portion that rotates the face foot door 17 is rotated. Since it is the same as the structure of the part, the illustration is omitted.

  A driven lever 20 made of resin is coupled to the defroster door rotating shaft 18a. In this example, the driven lever 20 includes a door lever 21, a connecting lever 22, and an intermediate lever 23.

  Specifically, one end portion of the defroster door rotating shaft 18a penetrates the wall surface of the case 2 and protrudes to the outside of the case 2, and the protruding end portion is fitted into the shaft hole 21a of the door lever 21 and integrally coupled. Yes. Accordingly, the link mechanism 19 of FIG. 2 including the door lever 21 is disposed outside the case 2.

  Since a non-rotating structure (not shown) is provided at one end of the defroster door rotation shaft 18a and the shaft hole 21a of the door lever 21, the defroster door rotation shaft 18a rotates with the displacement of the door lever 21.

  Rotating shafts 22a and 22b of the connecting lever 22 are integrally formed at both ends of the connecting lever 22, respectively. One connecting lever rotating shaft 22a is rotatably fitted in the shaft hole 21b of the door lever 21, and the other The connecting lever rotating shaft 22b is rotatably fitted in the shaft hole 23a in one end portion (the upper end portion in FIG. 2) of the intermediate lever 23.

  A shaft portion 2 a protruding in a columnar shape from the case 2 is rotatably fitted in the shaft hole 23 b in the intermediate portion of the intermediate lever 23. Therefore, the intermediate lever 23 rotates around the center of the shaft hole 23b.

  The link plate 24 is a drive side link member that drives the driven lever 20. In this example, the link plate 24 is made of resin.

  A shaft hole 24a into which the output shaft 27 of the electric actuator is fitted is formed in the link plate 24, and the link plate 24 is rotated as the output shaft 27 of the electric actuator rotates.

  In this example, the electric actuator is arranged on the side farther from the outer surface of the case 2 than the link plate 24, and is fastened and fixed to the outer surface of the case 2 by fastening means (not shown).

  Instead of the electric actuator, a manual operation mechanism in which a rotational operation force is given by a manual operation of an occupant may be used.

  The link plate 24 is formed with a groove 25 extending in a predetermined width direction dimension. A pin portion 26 of the intermediate lever 23 is slidably fitted inside the groove portion 25. The pin portion 26 is formed in a cylindrical shape having a predetermined diameter at the other end portion (the lower end portion in FIG. 2) of the intermediate lever 23.

  Although not shown, the link plate 24 is formed with a groove portion similar to the groove portion 25 separately from the groove portion 25, and the pin portion of the driven lever that rotates the face foot door 17 slides in this groove portion. It fits as possible.

  3 is an AA enlarged cross-sectional view in FIG. As shown in FIG. 3, the intermediate lever 23 and the link plate 24 are stacked in the axial direction of the pin portion 26. In this example, the intermediate lever 23 is disposed adjacent to the outer surface of the case 2, and the link plate 24 is disposed on the side farther from the outer surface of the case 2 than the door lever 21.

  The groove portion 25 of the link plate 24 includes a drive groove portion 25 a that drives the pin portion 26 and an idle groove portion 25 b that stops driving the pin portion 26. The idle groove 25b is an arcuate groove centered on the rotation center of the link plate 24, that is, the output shaft 27 of the electric actuator, and drives the pin 26 over a range of a predetermined operating angle even if the link plate 24 rotates. To stop.

  In addition, in order to ensure the slidability between the groove portion 25 and the pin portion 26, the diameter of the pin portion 26 is set to be slightly smaller than the width direction dimension of the groove portion 25.

  4 is an enlarged cross-sectional view taken along line BB in FIG. In the intermediate lever 23, a protrusion 28 that suppresses a sudden movement of the intermediate lever 23 is provided toward the case 2 at a portion between the shaft hole 23 b that forms the rotation center and the shaft hole 23 a on the rotation tip side. It is formed so as to protrude in a cylindrical shape.

  On the other hand, the case 2 is integrally formed with a sliding portion 29 with which the protruding portion 28 comes into sliding contact. The sliding portion 29 protrudes from the outer surface of the case 2 toward the intermediate lever 23 and constitutes two wall portions 29 a and 29 b extending along the rotation direction of the intermediate lever 23. In other words, the sliding portion 29 is formed in a shape that extends along the operation locus of the protrusion 28 when the driven lever 20 is displaced.

  The two wall portions 29a and 29b are arranged so as to sandwich the outer peripheral surface of the columnar projection 28. The dimension W1 between the two wall portions 29a and 29b in the one end side portion (the right end side portion in FIG. 2) of the sliding portion 29 is slightly smaller than the diameter D of the protruding portion 28. The dimension W2 in the end portion (left end portion in FIG. 2) is larger than the diameter D of the protrusion 28.

  Therefore, in a state where the protruding portion 28 is located at one end side portion of the sliding portion 29, the protruding portion 28 is slidably fitted to the sliding portion 29. For this reason, when the intermediate lever 23 is rotationally displaced in a state where the projection 28 is located at one end side portion of the sliding portion 29, the outer peripheral surface of the projection 28 and the inner wall surface of the sliding portion 29 are in surface contact. Slide.

  On the other hand, when the intermediate lever 23 is rotationally displaced in a state where the protruding portion 28 is located at the other end portion of the sliding portion 29, the protruding portion 28 and the sliding portion 29 do not slide.

  At one end portion of the sliding portion 29 (right end portion in FIG. 2), the two wall portions 29a and 29b are joined in an arc shape. On the other hand, the other end portion (left end portion in FIG. 2) of the sliding portion 29 is opened without the two wall portions 29a and 29b being joined to each other.

  In FIG. 2, the solid line positions of the defroster door 18 and the link mechanism 19 are fully closed positions that fully close the defroster outlet 16, and the two-dot chain line positions of the defroster door 18 and the link mechanism 19 are fully open of the defroster outlet 16. Position.

  A seal member (packing) 18b that secures a sealing property between the defroster door 18 and the defroster outlet 16 is fixed to a surface of the defroster door 18 facing the defroster outlet 16 side. The seal member 18b is made of an elastic material.

  When the defroster door 18 is rotated to the fully closed position, the seal member 18b is elastically deformed and pressed against the seal surface 16a formed integrally with the case 2 at the periphery of the defroster outlet 16 so as to be compressed. It has become. As a result, the seal member 18 b exhibits a sealing property between the defroster door 18 and the defroster outlet 16.

  Next, the operation in the above configuration will be described. Now, when the link mechanism 19 is operated to the fully closed position (solid line position in FIG. 2) by the electric actuator, the defroster door 18 is rotated to the fully closed position (solid line position in FIG. 2).

  At this time, the pin portion 26 of the intermediate lever 23 is located in the idle groove portion 25 b of the link plate 24. Further, the sealing member 18b of the defroster door 18 is pressed against the sealing surface 16a at the peripheral edge of the defroster outlet 16 and is elastically compressed to exhibit sealing performance.

  Here, a repulsive force is generated in the elastically compressed seal member 18 b, and this repulsive force acts in a direction to open the defroster door 18. The repulsive force of the seal member 18 b acts on the intermediate lever 23 via the door lever 21 and the connecting lever 22.

  In the present embodiment, since the protrusion 28 of the intermediate lever 23 is located at one end of the sliding portion 29 of the case 2, the outer peripheral surface of the protrusion 28 and the inner wall surface of the sliding portion 29 can slide. Touching. For this reason, the repulsive force of the elastically compressed seal member 18 b is transmitted to the case 2 via the protrusion 28 and the sliding portion 29.

  In other words, the repulsive force of the seal member 18b can be prevented from acting on the pin portion 26 of the intermediate lever 23. For this reason, it is suppressed that the driving force from the link plate and the repulsive force of the seal member 18b act on the pin portion 26 of the intermediate lever 23 in a direction opposite to each other and a large load acts on the pin portion 26 of the intermediate lever 23. it can.

  As a result, it is possible to prevent the intermediate lever 23 from being permanently deformed due to a large load acting on the pin portion 26 of the intermediate lever 23, and therefore, the permanent deformation of the intermediate lever 23 causes a gap between the defroster door 18 and the defroster outlet 16. It can suppress that a sealing performance falls.

  Next, when the link mechanism 19 is operated from the fully closed position toward the fully open position (two-dot chain line position in FIG. 2) by the electric actuator, the pin portion 26 of the intermediate lever 23 is positioned in the drive groove portion 25a of the link plate 24. Therefore, the defroster door 18 is rotated from the fully closed position toward the fully open position (the two-dot chain line position in FIG. 2).

  In FIG. 2, the alternate long and short dash line position of the link mechanism 19 indicates the position of the link mechanism 19 in a state where the defroster door 18 starts to rotate from the fully closed position toward the fully open position. As shown in FIG. 2, the pin portion 26 of the intermediate lever 23 moves from the idle groove portion 25b side to the drive groove portion 25a side, and reaches the inflection portion 25c located at the boundary portion between the idle groove portion 25b and the drive groove portion 25a. .

  Here, when the defroster door 18 is rotated to the fully closed position, the seal member 18b of the defroster door 18 is compressed by being pressed against the seal surface 16a at the peripheral edge of the defroster outlet 16, so that it is elastically compressed. The repulsive force of the sealing member 18b acts in a direction to open the defroster door 18. Therefore, the pin portion 26 of the intermediate lever 23 slides while being pressed against the inner wall surface on the outer peripheral side (right side in FIG. 2) of the idle groove portion 25b.

  FIG. 5 is an enlarged plan view for explaining the movement of the pin portion 26 at this time. When the pin portion 26 of the intermediate lever 23 is positioned at the inflection portion 25c and is released from the idle groove portion 25b, the defroster door 18 is opened suddenly by the repulsive force of the seal member 18b, and the pin portion 26 of the intermediate lever 23 is It tries to move suddenly in the direction of arrow C from the position of the solid line.

  In FIG. 5, the two-dot chain line position of the pin portion 26 of the intermediate lever 23 indicates the position when the pin portion 26 suddenly moves in the arrow C direction. When the pin part 26 moves suddenly in the direction of the arrow C, there is a problem that the pin part 26 collides with the inner wall surface in the vicinity of the inflection part 25c and an abnormal noise (acting sound called squeal) is generated.

  Therefore, in the present embodiment, when the pin portion 26 of the intermediate lever 23 is positioned at the inflection portion 25c (at the position of the one-dot chain line in FIG. 2), the projection 28 of the intermediate lever 23 is slid on the case 2. The outer peripheral surface of the projecting portion 28 and the inner wall surface of the sliding portion 29 are brought into sliding contact with each other so as to be positioned at one end portion of the moving portion 29.

  For this reason, since a sliding frictional force is generated between the protrusion 28 and the sliding portion 29, it is possible to suppress the pin portion 26 of the intermediate lever 23 from moving suddenly in the direction of the arrow C.

  As a result, it can be avoided that the pin portion 26 of the intermediate lever 23 collides with the inner wall surface in the vicinity of the inflection portion 25c and noise is generated.

  When the pin portion 26 of the intermediate lever 23 is positioned in the drive groove portion 25a of the link plate 24 and the defroster door 18 rotates toward the fully open position, the protrusion 28 of the intermediate lever 23 is moved to the other end of the sliding portion 29 of the case 2. It comes to be located in the side part.

  In this state, the projecting portion 28 and the sliding portion 29 do not slide, so that it is possible to avoid an increase in the rotational operation force of the link mechanism 19 due to the sliding frictional force between the projecting portion 28 and the sliding portion 29.

  Here, since the two wall parts 29a and 29b are couple | bonded in circular arc shape at the one end part (right end part of FIG. 2) of the sliding part 29, the rigidity of the sliding part 29 is securable. For this reason, even if the protruding portion 28 is fitted to the sliding portion 29, the sliding portion 29 can be prevented from being deformed and a sliding frictional force can be generated between the protruding portion 28 and the sliding portion 29. .

  On the other hand, the other end portion (left end portion in FIG. 2) of the sliding portion 29 is opened without the two wall portions 29a and 29b being joined to each other. That is, if the two wall portions 29a and 29b are joined to each other at both end portions (left and right end portions in FIG. 2) of the sliding portion 29, if foreign matter such as sand enters the sliding portion 29, the foreign matter is slid. It becomes difficult to be discharged from the moving portion 29, and the foreign matter stays in the sliding portion 29.

  Therefore, by opening the other end portion of the sliding portion 29, foreign matter can be discharged from the other end portion of the sliding portion 29, and foreign matter is prevented from staying in the sliding portion 29.

(Second Embodiment)
In the first embodiment, the protrusion 28 of the intermediate lever 23 is formed in a columnar shape. However, in the second embodiment, as shown in FIGS. 6A and 6B, the protrusion 28 is slit. It is formed in a cylindrical shape.

  FIG. 6A is an enlarged cross-sectional view of a main part of the link mechanism 19 according to the present embodiment, and corresponds to FIG. 4 of the first embodiment. FIG. 6B is a cross-sectional view taken along line EE in FIG.

  The protrusion 28 according to the present embodiment has a cylindrical shape that protrudes toward the case 2 as a whole. The protrusion 28 is divided into a first protrusion 31 on the rotation center side of the intermediate lever 23 and a second protrusion 32 on the rotation tip side by a cylindrical slit 30 extending in the axial direction.

  When the protruding portion 28 and the wall portions 29a and 29b of the sliding portion 29 come into contact, external force from the wall portions 29a and 29b acts on the protruding portion 28 in a direction perpendicular to the wall portions 29a and 29b. In the present embodiment, since the projecting portion 28 is formed in a cylindrical shape with a slit, the projecting portion 28 can be elastically deformed in the acting direction of external force (direction perpendicular to the wall portions 29a and 29b).

  For this reason, the sliding frictional force can be stably generated between the protruding portion 28 and the sliding portion 29 without being affected by the processing accuracy and assembly accuracy of the protruding portion 28 and the sliding portion 29.

(Third embodiment)
In the first embodiment, the protruding portion 28 and the sliding portion 29 are slid by fitting the protruding portion 28 of the intermediate lever 23 to the sliding portion 29. However, in the third embodiment, As shown in FIG. 7, the protrusion 28 and the sliding portion 29 are slid without fitting the protrusion 28 and the sliding portion 29.

  FIG. 7 is an enlarged cross-sectional view of a main part of the link mechanism 19 according to the present embodiment, which corresponds to FIG. 4 of the first embodiment. In the present embodiment, a conical surface 33 having a diameter that decreases from the base side toward the distal end side is formed on the protrusion 28, and the conical surface 33 is brought into contact with the distal end portion (the upper end portion in FIG. 7) of the sliding portion 29. Yes.

  As shown by a two-dot chain line in FIG. 7, the conical surface 33 is formed so that the conical surface 33 slightly interferes with the tip of the sliding portion 29. Thus, when the intermediate lever 23 is rotationally displaced, a sliding frictional force is generated between the conical surface 33 and the tip of the sliding portion 29.

  Therefore, the protruding portion 28 and the sliding portion 29 can be brought into sliding contact without being fitted. For this reason, in the assembly process of the link mechanism 19, the operation | work which fits the projection part 28 and the sliding part 29 becomes unnecessary, and the assembly workability | operativity of the link mechanism 19 can be improved.

(Fourth embodiment)
In the said 1st Embodiment, although the sliding part 29 of case 2 comprises two wall part 29a, 29b, as shown to Fig.8 (a), (b) in this 4th Embodiment, The sliding portion 29 constitutes only one wall portion 29a.

  FIG. 8A is an enlarged plan view of a main part of the link mechanism 19 according to the present embodiment, and FIG. 8B is a plan view for explaining how a sliding frictional force is generated in the present embodiment.

  In the present embodiment, the wall portion 29 a is formed closer to the rotation tip side of the intermediate lever 23 than the protrusion portion 28 (the upper side of FIG. 8A), but the wall portion 29 a is more intermediate than the protrusion portion 28. You may form in the rotation center side (lower side of Fig.8 (a)).

  As shown in FIG. 8B, the wall 29a and the projection 28 are set in a positional relationship that interferes with a minute dimension δ. For this reason, a sliding frictional force is generated between the wall portion 29 a and the protruding portion 28. The minute dimension δ can be arbitrarily set, and thereby, the magnitude of the sliding frictional force can be arbitrarily set.

  In the present embodiment, since only one wall portion 29a needs to be formed as the sliding portion 29, the molding cost of the case 2 can be reduced compared to the case where the two wall portions 29a and 29b are formed as the sliding portion 29. Can be reduced.

(Fifth embodiment)
In the fourth embodiment, the protrusion 28 is formed on the intermediate lever 23. However, in the fifth embodiment, the protrusion 28 is connected to the connecting lever 22 as shown in FIGS. Forming.

  FIG. 9A is a plan view of a main part of the link mechanism 19 according to the present embodiment, FIG. 9B is a view in the direction of arrow F in FIG. 9A, and FIG. 9C is the present embodiment. It is a principal part perspective view of the link mechanism 19 by.

  In the present embodiment, a protrusion 28 is formed in a portion of the connecting lever 22 between the rotation shaft 22a on the door lever 21 side and the rotation shaft 22b on the intermediate lever 23 side. The sliding portion 29 (wall portion 29a) is formed on the intermediate lever 23 side rotation shaft 22b side (left side in FIG. 9) from the projection portion 28, in other words, on the rotation center side of the intermediate lever 23. .

  In the present embodiment, since the protruding portion 28 is formed on the connecting lever 22, the repulsive force of the seal member 18 b of the defroster door 18 is transmitted from the connecting lever 22 to the case 2 via the protruding portion 28 and the sliding portion 29. The

  In other words, it is possible to suppress the repulsive force of the seal member 18 b from acting on the intermediate lever 23. For this reason, since the load which acts on the pin part 26 of the intermediate lever 23 can be reduced more, the permanent deformation | transformation of the intermediate lever 23 by a load can be suppressed more.

  In this embodiment as well, a sliding frictional force is generated between the protrusion 28 and the sliding portion 29, and therefore, as in the above-described embodiments, an abnormal noise due to a collision between the pin portion 26 and the groove portion 25 (cone) ) Can be avoided.

(Sixth embodiment)
In each of the above embodiments, when the defroster door 18 starts to rotate from the fully closed position toward the fully open position, the protruding portion 28 and the sliding portion 29 slide, but in the sixth embodiment, As shown in FIG. 10, the protruding portion 28 and the sliding portion 29 slide at times other than when the defroster door 18 starts to rotate from the fully closed position toward the fully open position.

  FIG. 10 is a plan view of the link mechanism 19 according to the present embodiment. In the present embodiment, the driven lever 20 is composed of a single member. The driven lever 20 is formed with a shaft hole 20a into which one end of the defroster door rotating shaft 18a is fitted. Since a non-rotating structure (not shown) is provided at one end of the defroster door rotating shaft 18a and the shaft hole 20a of the driven lever 20, the defroster door rotating shaft 18a rotates with the displacement of the driven lever 20. To do.

  The driven lever 20 is formed with a groove portion 34 extending in a predetermined width direction toward the side away from the side close to the defroster door rotating shaft 18a. A pin portion 35 of the link plate 24 is slidably fitted inside the groove portion 34. The pin portion 35 is formed in a cylindrical shape having a predetermined diameter at one end portion of the link plate 24. The groove portion 25 is formed in the driven lever 20, the pin portion 26 is formed in the link plate 24, and the pin portion 26 of the link plate 24 is slidably fitted inside the groove portion 25 of the driven lever 20.

  A shaft portion 2b protruding in a cylindrical shape from the case 2 is rotatably fitted in the shaft hole 24a of the link plate 24, and the link plate 24 is connected to an electric actuator (not shown) via a rod 24b. Accordingly, the link plate 24 is rotated about the shaft hole 24a as the electric actuator rotates.

  When the link mechanism 19 is operated to the fully closed position (solid line position in FIG. 10) by the electric actuator, the defroster door 18 is rotated to the fully closed position (dashed line position in FIG. 10). At this time, the pin portion 35 of the link plate 24 is positioned at one end portion (the end portion on the side away from the defroster door rotating shaft 18a) of the groove portion 34 of the driven lever 20.

  Although illustration is omitted, as in the first embodiment, a sealing property between the defroster door 18 and the defroster outlet is ensured on the surface of the defroster door 18 facing the defroster outlet. When the seal member (packing) is fixed and the defroster door 18 is rotated to the fully closed position, the seal member is elastically deformed and pressed against the seal surface of the peripheral portion of the defroster outlet, and is compressed. It comes to show the sex.

  Next, when the link mechanism 19 is operated from the fully closed position toward the intermediate position by the electric actuator, the pin portion 35 of the link plate 24 is moved to the other end portion of the groove portion 34 of the driven lever 20 (on the side closer to the defroster door rotating shaft 18a). The defroster door 18 is rotated from the fully closed position toward the intermediate position.

  Further, when the link mechanism 19 is operated from the intermediate position toward the fully open position (the two-dot chain line position in FIG. 10) by the electric actuator, the pin portion 35 of the link plate 24 is again one end portion (defroster) of the groove portion 34 of the driven lever 20. The defroster door 18 is rotated from the intermediate position toward the fully open position (the two-dot chain line position in FIG. 10).

  In this embodiment, in order to set the rotation angle of the electric actuator and the rotation operation position of the defroster door 18 to a predetermined relationship, the other end of the groove 34 of the driven lever 20 (the end closer to the defroster door rotation shaft 18a). In the vicinity of (part), an inflection part 34a whose curvature radius changes is formed.

  In the link plate 24, a protrusion 36 that suppresses the rapid movement of the link plate 24 is formed at a portion between the shaft hole 24 a and the pin portion 35 so as to protrude in a cylindrical shape toward the case 2 side. ing.

  On the other hand, the case 2 is integrally formed with a sliding portion 37 with which the protruding portion 36 comes into sliding contact. The sliding part 37 protrudes from the outer surface of the case 2 to the link plate 24 side, and constitutes two wall parts 37 a and 37 b extending along the rotation direction of the link plate 24. In other words, the sliding portion 37 is formed in a shape that extends along the operation locus of the protrusion 36 when the link plate 24 is displaced.

  The sliding portion 37 is formed in accordance with the position of the protruding portion 36 when the pin portion 35 of the link plate 24 passes through the inflection portion 34 a of the groove portion 34 of the driven lever 20. The dimension between the walls 37a and 37b is slightly smaller than the diameter of the protrusion 36. Thereby, when the pin portion 35 of the link plate 24 passes through the inflection portion 34a of the groove portion 34 of the driven lever 20, the outer peripheral surface of the projection portion 28 and the inner wall surface of the sliding portion 29 are in surface contact and slide. Thus, a sliding frictional force is generated between the protruding portion 28 and the sliding portion 29.

  In this embodiment, when the pin portion 35 of the link plate 24 passes through the inflection portion 34a of the groove portion 34 of the driven lever 20, the pin portion 35 tends to move suddenly. The sliding frictional force generated during the period can suppress such a rapid movement of the pin portion 35.

  For this reason, when the pin portion 35 of the link plate 24 passes through the inflection portion 34a of the groove portion 34 of the driven lever 20, the pin portion 35 suddenly moves and collides with the inner wall surface of the groove portion 34, which is called abnormal sound. (Operation noise) can be avoided.

  In the present embodiment, the projection 36 of the link plate 24 is formed in a columnar shape, but like the projection 28 of the intermediate lever 23 in the second embodiment, the projection 36 is cylindrical with a slit. It may be formed.

  In this embodiment, the protrusion 36 and the sliding portion 37 are slid by fitting the protrusion 36 of the link plate 24 to the sliding portion 37. However, as in the third embodiment. In addition, a conical surface having a diameter that decreases from the root side toward the distal end side is formed on the projecting portion 36, the conical surface is brought into contact with the distal end portion of the sliding portion 37, and the projecting portion 28 and the sliding portion 29 are fitted. You may slide the projection part 28 and the sliding part 29, without making it match.

  In this embodiment, the sliding portion 37 of the case 2 constitutes two wall portions 37a and 37b. However, like the sliding portion 29 in the fourth embodiment, the sliding portion 37 has one sliding portion 37. You may make it comprise only the wall part 37a.

(Other embodiments)
(1) In the first to fifth embodiments, the sliding portion 29 is formed by the wall portions 29a and 29b protruding from the outer surface of the case 2 to the intermediate lever 23 side. In the sixth embodiment, the sliding portion 29 The portion 37 is formed by wall portions 37a and 37b protruding from the outer side surface of the case 2 to the link plate 24 side, but the sliding portions 29 and 37 are formed in a concave shape recessed with respect to the outer side surface of the case 2. Also good.

  (2) In the first to fifth embodiments, when the defroster door 18 is located at the fully closed position and when the defroster door 18 starts to rotate from the fully closed position toward the fully opened position, the protrusion 28 and the sliding portion 29 are in sliding contact. In addition, the protrusion 28 and the sliding portion 29 are in sliding contact while the defroster door 18 is rotating. It may be.

  Thereby, even when the defroster door 18 is at an intermediate opening, a frictional force is generated between the projection 28 and the sliding portion 29, so that the defroster door 18 is prevented from rattling due to the wind pressure of the blown air. it can.

  (3) In the sixth embodiment, the sliding portion 37 is formed in accordance with the position of the protruding portion 36 when the pin portion 35 of the link plate 24 passes through the inflection portion 34a of the groove portion 34 of the driven lever 20. However, the sliding portion 37 may be formed in accordance with the position of the protrusion 36 when the defroster door 18 is located at the fully closed position.

  As a result, when the defroster door 18 is in the fully closed position, the outer peripheral surface of the protrusion 36 and the inner wall surface of the sliding portion 37 are slidably in contact with each other, so that the repulsive force of the elastically compressed seal member is increased. It is transmitted to the case 2 through the protrusion 36 and the sliding portion 37.

  In other words, the repulsive force of the seal member can be prevented from acting on the pin portion 26 of the link plate 24. For this reason, it can suppress that the driving force from an electric actuator and the repulsive force of a sealing member act on the pin part 26 of the link plate 24 in the direction which opposes, and a big load acts on the pin part 26 of the link plate 24. .

  As a result, it is possible to prevent the link plate 24 from being permanently deformed due to a large load acting on the pin portion 26 of the link plate 24, and therefore the seal between the defroster door 18 and the defroster outlet due to the permanent deformation of the link plate 24. It can suppress that property falls.

  (4) In each of the above embodiments, the present invention is applied to the link mechanism that drives the defroster door 18, but the application of the present invention is not limited to this. For example, the inside / outside air switching door 5 or the air mix door The present invention can be applied to 13.

It is a mimetic diagram showing the air-conditioner for vehicles by a 1st embodiment of the present invention. It is a top view which shows the link mechanism by 1st Embodiment. It is an AA expanded sectional view in FIG. It is BB expanded sectional drawing in FIG. FIG. 3 is an enlarged plan view for explaining how a collision sound is generated in the link mechanism of FIG. 2. (A) is a principal part expanded sectional view of the link mechanism by 2nd Embodiment, (b) is EE sectional drawing in (a). It is a principal part expanded sectional view of the link mechanism by 3rd Embodiment. (A) is a principal part enlarged plan view of the link mechanism by 4th Embodiment, (b) is a top view explaining a mode that a sliding frictional force generate | occur | produces in 4th Embodiment. (A) is a principal part top view of the link mechanism by 5th Embodiment, (b) is a F direction arrow directional view in (a), (c) is a principal part perspective view of the link mechanism by 5th Embodiment. FIG. It is a top view which shows the link mechanism by 6th Embodiment.

Explanation of symbols

2 ... Case, 16 ... Defroster outlet (air passage), 18 ... Defroster door (door),
20 ... driven lever, 24 ... link plate, 25 ... groove part, 26 ... pin part, 28 ... projection part,
29 ... sliding part.

Claims (10)

A case (2) where air flows into the passenger compartment;
A door (18) disposed in the case (2) and opening and closing an air passage (16) in the case (2);
A link plate (24) rotated by a drive device;
A driven lever (20) coupled to a rotating shaft (18a) of the door (18);
Groove portions (25, 34) provided in one member of the link plate (24) and the driven lever (20);
A pin portion (26, 35) provided on the other member of the link plate (24) and the driven lever (20) and slidably fitted in the groove portion (25, 34);
The other member is molded of resin;
Projections (28, 36) projecting toward the case (2) are formed on the other member,
In the case (2), at least when the door (18) fully closes the air passage (16), sliding portions (29, 37) with which the projecting portions (28, 36) are in sliding contact. ) Is formed. A link mechanism for a vehicle air conditioner. A case (2) where air flows into the passenger compartment;
A door (18) disposed in the case (2) and opening and closing an air passage (16) in the case (2);
A link plate (24) rotated by a drive device;
A driven lever (20) coupled to a rotating shaft (18a) of the door (18);
Groove portions (25, 34) provided in one member of the link plate (24) and the driven lever (20);
A pin portion (26, 35) provided on the other member of the link plate (24) and the driven lever (20) and slidably fitted in the groove portion (25, 34);
Projections (28, 36) projecting toward the case (2) are formed on the other member,
A sliding mechanism (29, 37) in which the protrusion (28, 36) is slidably contacted is formed in the case (2). The sliding portion (29) is in sliding contact with the protruding portion (28) when at least the door (18) starts rotating from the fully closed position of the air passage (16) toward the fully open position. The link mechanism of the vehicle air conditioner according to claim 2, wherein the link mechanism is formed as described above. In the groove portions (25, 34), inflection portions (25c, 34a) in which the radius of curvature changes are formed,
The sliding portions (29, 37) are in sliding contact with the protruding portions (28, 36) when at least the pin portions (26, 35) pass through the inflection portions (25c, 34a). The link mechanism of the vehicle air conditioner according to claim 2, wherein the link mechanism is formed as described above. The said sliding part (29, 37) is formed in the shape extended along the operation | movement locus | trajectory of the said projection part (28, 36) when the said other member displaces. The link mechanism of the vehicle air conditioner according to any one of 4. The protrusions (28, 36) have a cylindrical shape;
The link mechanism of the vehicle air conditioner according to claim 5, wherein the sliding portion (29, 37) has a groove shape sandwiching the columnar outer peripheral surface side. The projection (28) is formed with a conical surface (33) whose diameter decreases from the other member side toward the case (2) side,
The link mechanism of the vehicle air conditioner according to claim 5, wherein the conical surface (33) is in sliding contact with the sliding portion (29). The protrusion (28) is formed so as to be elastically deformed in the acting direction of the external force when it contacts the sliding portion (29) and receives an external force from the sliding portion (29). The link mechanism of the vehicle air conditioner according to claim 5. The one member is the link plate (24);
The link mechanism of the vehicle air conditioner according to any one of claims 1 to 8, wherein the other member is the driven lever (20). The one member is the driven lever (20);
The link mechanism for a vehicle air conditioner according to any one of claims 1 to 8, wherein the other member is the link plate (24).

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