JP2020026212A - Driving gear mechanism - Google Patents

Abstract

To provide a driving gear mechanism in which rotation speed of a driven gear can be changed.SOLUTION: Sum of a distance (Ltx) in a radial direction from teeth tips of teeth (21bx and 31bx) at a first end which lastly pass on an inter-shaft line (L) connecting rotation shafts (Ax and Bx) of teeth (21b and 31b) in a first driving gear part (21) and a first driven gear part (31) of a driving mechanism (10) to rotation shafts (Ax and Bx) of gear parts (21 and 31) having teeth (21bx and 31bx) at the first end and a distance (Lsx) in the radial direction from surfaces (31ax and 21ax) of main body parts opposing on the inter-shaft line (L) to the teeth tips of the teeth (21bx and 31bx) at the first end to rotation shafts (Bx and Ax) of the main body parts (31a and 21a) is equal to or more than sum of reference circle diameters (R22 and R32) of a second driving gear part (22) and a second driven gear part (32).SELECTED DRAWING: Figure 7B

Description

  The present invention relates to a drive gear mechanism.

  BACKGROUND ART Conventionally, an air conditioner for a vehicle including an air conditioning case having an air passage formed therein and a door arranged inside the air conditioning case to change a flow of air flowing through the air passage is known. The door is provided in, for example, an air-mix door or an air-conditioning case that adjusts the ratio of air that is heated by passing through the heating heat exchanger disposed in the air passage and air that bypasses the heating heat exchanger. And a blow-out passage door that closes or opens the blow-out passage.

  Patent Literature 1 discloses a drive gear mechanism for driving such a door. In Patent Document 1, the drive gear mechanism includes a drive gear that is driven to rotate by an actuator, and a driven gear that meshes with the drive gear and a rack provided on a door. The rotational driving force of the actuator is transmitted to a door rack via a drive gear and a driven gear, and is converted into a vertical motion by the rack, thereby sliding the door vertically.

  By the way, in recent years, in order to diversify the operation mode of the air conditioner, or to realize temperature harmony with higher accuracy, the rotation of the driven gear with respect to the rotation speed of the drive gear according to the rotation phase of the drive gear. There is a need for a drive gear mechanism that can change speed. If the configuration of each gear is made more complicated in order to realize such a drive gear mechanism, if there is an assembly error or a dimensional error in the air conditioner or the drive gear mechanism itself, the gears cannot even mesh with each other. In some cases, the drive gear mechanism does not operate.

  From the above, there is a need for a drive gear mechanism that can change the rotation speed of the driven gear with respect to the rotation speed of the drive gear according to the rotation phase of the drive gear, and that can operate even when an assembly error or dimensional error occurs. I have.

JP 2013-86719 A

  The present invention provides a drive gear mechanism that can change the rotation speed of a driven gear with respect to the rotation speed of a drive gear according to the rotation phase of the drive gear, and that can operate even when an assembly error or a dimensional error occurs. The purpose is.

According to a preferred embodiment of the present invention,
In a vehicle air conditioner having an air conditioning case that forms an air passage through which air flows, a drive gear mechanism that drives a door that changes a flow of air flowing through the air passage,
An actuator for generating a rotational driving force,
A drive gear rotationally driven by the actuator,
A driven gear that is connected to a shaft that drives the door and that meshes with the drive gear to transmit the rotational driving force of the actuator to the shaft;
With
The drive gear has a first drive gear portion and a second drive gear portion having different reference circle diameters from each other,
The driven gear has a first driven gear and a second driven gear having different reference circle diameters provided corresponding to the first driving gear and the second driving gear, respectively.
The mesh between the drive gear and the driven gear is a first mesh between the first drive gear section and the first driven gear section, or the second drive gear section, according to a rotation phase of the drive gear. And the second driven gear portion is engaged by a second engagement,
The first drive gear portion and the second drive gear portion each include a main body connected to the actuator and the first meshing with the first driven gear provided on the main body or the first driven gear. A plurality of teeth contributing to the second meshing with a second driven gear portion,
The first driven gear portion and the second driven gear portion each include a main body connected to the shaft and the first meshing with the first drive gear provided on the main body, or A plurality of teeth that contribute to the second engagement with the second drive gear portion,
A rotation axis of the drive gear and a rotation axis of the driven gear when shifting from the first meshing to the second meshing among the plurality of teeth of the first driving gear portion and the first driven gear portion. And the radial distance from the tip of the tooth of the first end that passes last on the interaxial line connecting the gear to the rotation axis of the gear portion having the tooth of the first end, and the distance of the tooth of the first end. The sum of the radial distance from the surface of the body portion of the gear portion facing the tooth tip and the inter-axis line to the rotation axis of the gear portion having the body portion is the reference circle diameter of the second drive gear portion and the A drive gear mechanism is provided that is at least equal to the sum of the reference circle diameter of the second driven gear portion and the reference circle diameter.

Alternatively, according to another preferred embodiment of the present invention,
In a vehicle air conditioner having an air conditioning case that forms an air passage through which air flows, a drive gear mechanism that drives a door that changes a flow of air flowing through the air passage,
An actuator for generating a rotational driving force,
A drive gear rotationally driven by the actuator,
A driven gear that is connected to a shaft that drives the door and that meshes with the drive gear to transmit the rotational driving force of the actuator to the shaft;
With
The drive gear has a first drive gear portion and a second drive gear portion having different reference circle diameters from each other,
The driven gear has a first driven gear and a second driven gear having different reference circle diameters provided corresponding to the first driving gear and the second driving gear, respectively.
The mesh between the drive gear and the driven gear is a first mesh between the first drive gear section and the first driven gear section, or the second drive gear section, according to a rotation phase of the drive gear. And the second driven gear portion is engaged by a second engagement,
The first drive gear portion and the second drive gear portion each include a main body connected to the actuator and the first meshing with the first driven gear provided on the main body or the first driven gear. A plurality of teeth contributing to the second meshing with a second driven gear portion,
The first driven gear portion and the second driven gear portion each include a main body connected to the shaft and the first meshing with the first drive gear provided on the main body, or A plurality of teeth contributing to the second engagement with the second drive gear portion,
A plurality of teeth of the first drive gear portion, when transitioning from the first meshing to the second meshing, on an inter-axis line connecting the rotation axis of the drive gear and the rotation axis of the driven gear, A third end tooth passing last of the plurality of teeth of the first drive gear portion;
When the plurality of teeth of the second drive gear unit transition from the first meshing to the second meshing, the plurality of teeth of the second drive gear unit are the first among the plurality of teeth of the second drive gear unit. A fourth end tooth passing therethrough,
The second driving gear portion or the second driven gear portion may be configured such that the fourth end tooth is brought into contact after the third end tooth starts to contact any one of the plurality of teeth of the first driven gear portion. Further comprising a first additional tooth passing on said inter-axis until reaching said inter-axis,
A radial distance from the tip of the first additional tooth to the rotation axis of the gear portion having the first additional tooth, and facing the tip of the first additional tooth on the interaxial line; The sum of the radial distance from the surface of the main body portion of the gear portion to the rotation axis of the gear portion having the main body portion is equal to the reference circle diameter of the second drive gear portion and the reference circle diameter of the second driven gear portion. A drive gear mechanism is provided that is equal to or greater than

  According to the embodiment of the present invention, the drive gear that can change the rotation speed of the driven gear with respect to the rotation speed of the drive gear according to the rotation phase of the drive gear and that can operate even when an assembly error or a dimensional error occurs. A mechanism can be provided.

It is a side view which shows typically the structure of the air conditioning part of the air conditioner by one Embodiment of this invention. FIG. 2 is a cross-sectional view of the air-conditioning unit shown in FIG. 1 taken along the line II. FIG. 2 is a cross-sectional view of the air-conditioning unit shown in FIG. 1 taken along the line II-II. FIG. 2 is an exploded perspective view showing an air mix door, a shaft, and a drive gear mechanism of the air conditioner shown in FIG. 1. FIG. 2 is a side view showing a drive gear, an upper driven gear, a rack, and a lower driven gear of the drive gear mechanism shown in FIG. 1. FIG. 6 is a side view showing a driving gear and an upper driven gear shown in FIG. 5. FIG. 6 is a partially enlarged side view for explaining an operation of the drive gear and the upper driven gear shown in FIG. 5 when shifting from first meshing to second meshing. FIG. 6 is a partially enlarged side view for explaining an operation of the drive gear and the upper driven gear shown in FIG. 5 when shifting from first meshing to second meshing. FIG. 6 is a partially enlarged side view for explaining an operation of the drive gear and the upper driven gear shown in FIG. 5 when shifting from first meshing to second meshing. FIG. 6 is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 5 when shifting from second meshing to first meshing. FIG. 6 is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 5 when shifting from second meshing to first meshing. FIG. 6 is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 5 when shifting from second meshing to first meshing. FIG. 7 is a side view illustrating a driving gear and an upper driven gear according to a modification, corresponding to FIG. 6. FIG. 10 is a view corresponding to FIG. 7B and is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 9 when shifting from the first meshing to the second meshing. FIG. 10 is a view corresponding to FIG. 8B and is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 9 when shifting from the second mesh to the first mesh. FIG. 7 is a side view showing a drive gear and an upper driven gear according to another modification, corresponding to FIG. 6. It is a figure corresponding to Drawing 6, and is a side view showing a drive gear by another modification, and an upper driven gear. FIG. 7 is a view corresponding to FIG. 6 and is a side view showing a drive gear and an upper driven gear according to a second embodiment. FIG. 17 is a view corresponding to FIG. 7B and is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 14 when shifting from the first meshing to the second meshing. FIG. 15 is a view corresponding to FIG. 8B and is a partially enlarged side view for explaining the operation of the drive gear and the upper driven gear shown in FIG. 14 when shifting from the second mesh to the first mesh.

  An embodiment of the present invention will be described below with reference to the accompanying drawings.

<First embodiment>
FIG. 1 is a side view schematically showing a structure of an air conditioner of the air conditioner according to the first embodiment of the present invention. FIGS. 2 and 3 are cross-sectional views of the air-conditioning unit shown in FIG. 1 taken along lines II and II-II, respectively. FIG. 4 is an exploded perspective view showing an air mixing door, a shaft, and a drive gear mechanism of the air conditioner shown in FIG. For clarity of illustration, the illustration of the outlet passage door is omitted in FIG.

  In this specification, for convenience of explanation, the side shown in FIG. 1 is referred to as the left side of the air conditioner, and the side opposite to the side shown in FIG. 1 (see FIGS. 2 and 3) is referred to as the right side of the air conditioner. . Further, in the present specification, the terms "clockwise" and "counterclockwise" with respect to the rotation direction of the gears and shafts, which will be described later, refer to the gears and shafts from the left side to the right side of the air conditioner unless otherwise specified. The terms "clockwise" and "counterclockwise" are determined based on the situation seen in the heading direction.

  As shown in FIGS. 1 to 3, the air conditioner 1 a of the vehicle air conditioner 1 has an air conditioning case 2. The air conditioning case 2 forms an air passage 3 through which air flows. More specifically, as shown in FIGS. 2 and 3, a connection port 300 that is connected to a blower (not shown) is formed at the upstream end 2 a of the air conditioning case 2, and is blown out from the blower. The air that has flowed into the air passage 3 of the air conditioning case 2 through the connection port 300. In addition, a blower may be arrange | positioned at the left side of the air conditioning part 1a, and the connection port 300 is formed in the left side of the air conditioning part 1a in that case. A plurality of outlet passages 301, 302, 303 are formed at the downstream end 2b of the air conditioning case 2, and the air flowing into the air passage 3 flows out from the outlet passages 301, 302, 303. ing.

  The plurality of outlet passages of the air conditioning case 2 include a defrost outlet passage 301, a vent outlet passage 302, and a foot outlet passage 303. As shown in FIG. 1, the defrost blowing passage 301 is provided on the top surface 2 c of the air conditioning case 2. The downstream end of the defrost outlet passage 301 is connected to a not-shown defrost outlet that blows air toward the inner surface of the windshield in the vehicle compartment. Further, the vent outlet passage 302 is provided in an upper portion of the downstream end surface 2 d of the air conditioning case 2. The downstream end of the vent outlet passage 302 is connected to a vent outlet (not shown) that blows air toward the upper body of an occupant sitting in a driver seat and a passenger seat (and in some cases, a rear seat). The foot outlet passage 303 is provided in a lower portion of the downstream end surface 2 d of the air conditioning case 2. The downstream end of the foot outlet passage 303 is connected to a foot outlet (not shown) that blows air toward the feet of an occupant sitting in a driver's seat and a passenger seat (and, in some cases, a rear seat).

  As shown in FIGS. 1 to 3, a cooling heat exchanger (evaporator) 4, a heating heat exchanger (heater core) 5, and an air passage 3 flow through the air passage 3 of the air conditioning case 2. Various doors (air mix doors 6, 8 and outlet passage doors 301D, 302D, 303D) for changing the flow of air are provided. A drive gear mechanism 10 for driving the air mix doors 6, 8 is provided on the left side surface 2g of the air conditioning case 2.

  The cooling heat exchanger (evaporator) 4 is provided so that all of the air flowing into the air conditioning case 2 passes through the cooling heat exchanger 4. Specifically, the cooling heat exchanger 4 is provided so as to occupy the entire cross-sectional area of the air passage 3. The cooling heat exchanger 4 removes heat from the air passing therethrough and, when the humidity of the air is high, reduces the humidity of the air by condensing the moisture in the air.

  The heating heat exchanger (heater core) 5 is disposed downstream of the cooling heat exchanger 4 in the air passage 3 formed by the air conditioning case 2. The heating heat exchanger 5 heats the air passing therethrough.

  The heating heat exchanger 5 does not occupy the entire cross-sectional area of the air passage 3. In the air conditioning case 2, an upper detour 3a is formed above the heat exchanger 5 for heating, and a lower detour 3b is formed below the heat exchanger 5. In these detours 3a and 3b, the air flowing in the air passage 3 flows downstream of the heating heat exchanger 5 without passing through the heating heat exchanger 5 (bypassing the heating heat exchanger 5). Make it possible.

  The air mix doors 6 and 8 are provided between the cooling heat exchanger 4 and the heating heat exchanger 5 in the air flow direction. In the illustrated example, the air mix doors 6 and 8 are plate-shaped members, and are arranged substantially parallel to the upstream surface of the heating heat exchanger 5. The air mix doors 6 and 8 are provided in the upper part and the lower part of the air passage 3, respectively, so that the degree of opening of the upper detour 3a and the lower detour 3b can be adjusted. Hereinafter, the air mixing door 6 arranged in the upper part of the air passage 3 is also referred to as “upper air mixing door 6”, and the air mixing door 8 arranged in the lower part of the air passage 3 is referred to as “lower air mixing door”. 8 ".

  The upper air mix door 6 can slide in the upper part of the air passage 3 along the vertical direction. And the upper air mix door 6 adjusts the ratio of the air which goes to the upper part 5a of the heat exchanger 5 for heating, and the air which goes to the upper detour 3a according to the position. The lower air mix door 8 can slide in the lower part of the air passage 3 in the vertical direction. The lower air mixing door 8 adjusts the ratio of the air heading to the lower part 5b of the heating heat exchanger 5 and the air heading to the lower detour 3b according to the position.

  As shown in FIGS. 2 and 3, the upper air mix door 6 and the lower air mix door 8 are connected to shafts 7, 9 extending in the air passage 3 in the left-right direction, respectively. By rotating 9, the air passage 3 can be slid in the upper part and the lower part of the air passage 3 along the vertical direction. More specifically, as shown in FIG. 4, racks 6r and 8r are provided on one surface of each of the air mix doors 6 and 8 from the upper edge to the lower edge. Gears 7p and 9p that mesh with the racks 6r and 8r are provided on the outer peripheral surfaces of the shafts 7 and 9 respectively. When the shafts 7 and 9 are rotated in the circumferential direction, the rotational motion of the shafts 7 and 9 is converted into the vertical motion by the gears 7p and 9p and the racks 6r and 8r, and the air mixing doors 6 and 8 are moved up and down. It is designed to slide. The upper air mix door 6 and the lower air mix door 8 move at a speed corresponding to the rotation speed of the corresponding shafts 7, 9. Hereinafter, the shaft 7 connected to the upper air mix door 6 is also referred to as “upper shaft 7”, and the shaft 9 connected to the lower air mix door 8 is also referred to as “lower shaft 9”.

  As shown in FIG. 2, the shafts 7, 9 are rotatably supported at both ends by a left side surface 2 g and a right side surface 2 h of the air conditioning case 2. In the illustrated example, the left ends of the shafts 7 and 9 extend outside the air conditioning case 2 and are connected to the drive gear mechanism 10.

  As described above, the upper air mixing door 6 slides in the upper part of the air passage 3 in the up-down direction, so that the air is directed toward the upper part 5a of the heating heat exchanger 5 and is directed toward the upper detour 3a. Adjust the ratio with air. That is, when the upper air mixing door 6 slides in the vertical direction, the opening area of the upper detour 3a is changed, and the upper side of the upper part 5a of the heating heat exchanger 5 is seen in the air flow direction. The area of the portion overlapping the air mix door 6 is changed. As a result, the ratio of the air flowing toward the upper detour 3a in the upper part of the air passage 3 to the air flowing toward the upper part 5a of the heating heat exchanger 5 is changed. In the example shown in FIG. 1, the upper air mixing door 6 minimizes the opening area of the upper detour 3a, and the upper air mixing door 6 has a portion overlapping the upper air mixing door 6 of the upper portion 5a of the heating heat exchanger 5 in the air flow direction. The area is minimized. In this case, the ratio of the air toward the upper detour 3a in the upper portion of the air passage 3 is minimized, while the ratio of the air toward the heating heat exchanger 5 is maximized.

  Hereinafter, a position (a position shown in FIG. 1) where the opening area of the upper detour 3a of the upper air mixing door 6 is minimized is referred to as an “upper first position”, and a position where the opening area of the upper detour 3a is maximized. Is referred to as an “upper second position”.

  Further, as described above, the lower air mix door 8 slides along the up and down direction, so that the air flowing toward the lower portion 5b of the heating heat exchanger 5 and the air flowing toward the lower detour 3b are separated. Adjust the ratio. That is, when the lower air mixing door 8 slides in the vertical direction, the opening area of the lower detour 3b is changed, and the lower part of the heating heat exchanger 5 when viewed in the air flow direction. The area of the portion overlapping with the lower air mix door 8 of 5b is changed. Thereby, the ratio of the air heading to the lower detour 3b and the air heading to the heating heat exchanger 5 in the lower portion of the air passage 3 is changed. In the example shown in FIG. 1, the lower air mixing door 8 minimizes the opening area of the lower detour 3b, and lower air mixing door 8 of the lower portion 5b of the heating heat exchanger 5 in the air flow direction. And the area of the overlapping part is minimized. In this case, the ratio of air toward the lower detour 3b in the lower portion of the air passage 3 is minimized, while the ratio of air toward the heating heat exchanger 5 is maximized.

  Hereinafter, the position (the position shown in FIG. 1) where the opening area of the lower detour 3b of the lower air mixing door 8 is minimized is referred to as “lower first position”, and the opening area of the lower detour 3b is The position to be maximized is referred to as “lower second position”.

  As described above, on the downstream side of the heating heat exchanger 5, the air-conditioning case 2 is provided with the blow-out passages 301, 302, and 303 (see FIG. 1). Of these, the defrost blow passage 301 and the vent blow passage 302 are provided in the upper part of the air conditioning case 2. The air that has passed through the upper portion 5a of the heating heat exchanger 5 and / or the upper detour 3a tends to easily enter these outlet passages 301 and 302. The foot outlet passage 303 is formed in a lower portion of the air conditioning case 2. The air that has passed through the lower part 5b of the heating heat exchanger 5 and / or the lower detour 3b tends to easily enter the outlet passage 303.

  The outlet passage doors 301D, 302D, and 303D are provided in the defrost outlet passage 301, the vent outlet passage 302, and the foot outlet passage 303, respectively, and adjust the opening areas of the corresponding outlet passages 301, 302, and 303. In the following, in the meaning of the doors that open and close the outlet passages 301, 302, 303 following the defrost outlet, vent outlet, and foot outlet, the outlet passage doors 301D, 302D, 303D are referred to as defrost door 301D, vent door 302D, respectively. Also called a foot door 303D.

  The outlet passage doors 301D, 302D, and 303D are plate-like members extending from shafts 301s, 302s, and 303s that extend in the left-right direction in the air conditioning case 2. The outlet passage doors 301D, 302D, and 303D open or close the corresponding outlet passages 301, 302, and 303 by rotating the shafts 301s, 302s, and 303s by a drive gear mechanism (not shown). The degree of opening of these doors 301D, 302D, 303D is controlled by a control unit such as an in-vehicle microcomputer, so that the opening area of the outlet passages 301, 302, 303 can be set to an arbitrary opening area.

  The operation modes of the air conditioner 1 shown in FIG. 1 include, for example, a defrost mode, a differential foot mode, a foot mode, a vent mode, and a bi-level mode. In the defrost mode, the defrost door 301D is opened, the vent door 302D and the foot door 303D are closed, and conditioned air is blown from the defrost outlet. In the differential foot mode, the defrost door 301D and the foot door 303D are opened, and the vent door 302D is closed, so that conditioned air is blown out from the defrost air outlet and the foot air outlet. In the foot mode, the defrost door 301D and the vent door 302D are closed, the foot door 303D is opened, and the conditioned air is blown out from the foot outlet. In the vent mode, the vent door 302D is opened, the defrost door 301D and the foot door 303D are closed, and conditioned air is blown from the vent outlet. In the bi-level mode, the vent door 302D and the foot door 303D are opened, the defrost door 301D is closed, and conditioned air is blown from the vent outlet and the foot outlet.

  Next, a drive gear mechanism 10 that rotationally drives the upper shaft 7 and the lower shaft 9 will be described with reference to FIGS. 1 to 8C.

  FIG. 5 is a side view showing a driving gear, an upper driven gear, a rack, and a lower driven gear of the driving gear mechanism shown in FIG. FIG. 6 is a side view showing the driving gear and the upper driven gear shown in FIG. 7A to 7C are diagrams illustrating the operation of the drive gear and the upper driven gear when shifting from the first meshing to the second meshing, and FIGS. 8A to 8C are diagrams illustrating the operation of the driving gear and the upper driven gear. It is a figure which shows the operation | movement at the time of shifting from 2 meshing to 1st meshing.

  As shown in FIGS. 1 to 3, the drive gear mechanism 10 is disposed outside the air conditioning case 2 so as to face the left side surface 2 g of the air conditioning case 2. As shown in FIGS. 1 and 5, the driving gear mechanism 10 includes an actuator 11 that generates a rotational driving force, a driving gear 20 that is rotationally driven by the actuator 11, and an upper driven gear 30 that meshes with the driving gear 20. Have. The drive gear 20 has a drive force transmission shaft 20S that fits into a gear (not shown) inside the actuator 11, receives a rotational drive force from the actuator 11, and rotates clockwise or counterclockwise around the rotational axis Ax. Rotate. Since the upper driven gear 30 meshes with the drive gear 20, the rotational driving force of the actuator 11 is transmitted to the upper driven gear 30 via the drive gear 20. When the drive gear 20 rotates, the upper driven gear 30 rotates in a rotation direction opposite to the rotation direction of the drive gear 20. As shown in FIG. 2, the upper driven gear 30 is connected to the left end of the upper shaft 7 protruding outside the air conditioning case 2, and transmits the rotational driving force of the actuator 11 to the upper shaft 7. . The rotation phase of the drive gear 20 by the actuator 11 is controlled by a control unit (not shown) including a vehicle-mounted microcomputer and the like.

  As shown in FIG. 1, the drive gear mechanism 10 also includes a rack 40 extending substantially in the vertical direction, and a lower driven gear 50 that meshes with the rack 40. As shown in FIG. 3, the lower driven gear 50 is connected to the left end of the lower shaft 9 protruding outside the air conditioning case 2. As shown in FIG. 5, teeth that mesh with the driving gear 20 and the lower driven gear 50 are formed on the rack 40. The rack 40 meshes with the drive gear 20 at an upper portion thereof, and meshes with a lower driven gear 50 at a lower portion thereof. Since the rack 40 meshes with the drive gear 20, the rotational driving force of the actuator 11 is transmitted to the rack 40 via the drive gear 20. Then, the rack 40 linearly moves substantially vertically in accordance with the rotation of the drive gear 20. Further, since the rack 40 meshes with the lower drive gear 50, the rack 40 transmits the rotational driving force of the actuator 11 to the lower driven gear 50. Thus, the rotational driving force of the actuator 11 is transmitted to the lower shaft 9 via the drive gear 20, the rack 40, and the lower driven gear 50.

  In the illustrated example, the rack 40 meshes with the drive gear 20 and the lower driven gear 50 from one side of a virtual surface S1 including the rotation axis Ax of the drive gear 20 and the rotation axis Cx of the lower driven gear 50. I have. Therefore, the lower driven gear 50 rotates in the same direction as the rotation direction of the drive gear 20. On the other hand, the upper driven gear 30 rotates in the direction opposite to the rotation direction of the drive gear 20 as described above. As a result, the upper driven gear 30 and the lower driven gear 50 rotate in opposite directions. As a result, the upper shaft 7 and the lower shaft 9 rotate in opposite directions, and the upper air mix door 6 and the lower air mix door 8 slide in opposite directions in the vertical direction.

  The rack 40 is held movably in the vertical direction by holding means (not shown), and is urged toward the drive gear 20 and the lower driven gear 50 by urging means (not shown). Thus, proper engagement of the rack 40 with the drive gear 20 and the lower driven gear 50 is maintained.

  In the illustrated example, in the air conditioner 1, when the upper air mix door 6 is at the upper first position (see FIG. 1), the air mix doors 6, 8, the shafts 7, 9 and the drive gear mechanism 10 When the mix door 8 is at the lower first position (see FIG. 1) and the upper air mix door 6 is at the upper second position, the lower air mix door 8 is configured to be at the lower second position. Then, it is assembled to the air conditioning case 2. The positions of the upper air mix door 6 and the lower air mix door 8 are determined by the operation mode and set temperature of the air conditioner 1 set by the occupant, the actual temperature in the passenger compartment, the amount of solar radiation received by the vehicle, the outside temperature of the vehicle, Is controlled based on the target blowout temperature calculated using As a result, air having a temperature corresponding to the operating mode of the air conditioner 1 set by the occupant, the set temperature, and the like is blown into the vehicle interior.

  As understood from the above description, the positions of the doors 6 and 8 correspond to the rotation phase of the drive gear 20. Therefore, the position of each door 6, 8 is controlled by controlling the rotation phase of the drive gear 20.

  In the illustrated example, the drive gear mechanism 10 is configured such that the rotation speed of the lower driven gear 50 with respect to the rotation speed of the drive gear 20 is constant irrespective of the rotation phase of the drive gear 20, The rotation speed of the upper driven gear 30 changes according to the rotation phase of the drive gear 20. With the drive gear mechanism 10 configured as described above, the rotation speed of the upper driven gear 30 with respect to the rotation speed of the lower driven gear 50 changes according to the rotation phase of the drive gear 20. Then, in accordance with the rotational phase of the drive gear 20, the amount of displacement of the rotational phase of the upper shaft becomes larger or smaller than the amount of displacement of the rotational phase of the lower shaft. With the drive gear mechanism 10 configured in this manner, the opening area of the upper detour 3a is made larger or smaller than the opening area of the lower detour 3b in accordance with the rotation phase of the drive gear 20. can do. As a result, in accordance with the rotation phase of the drive gear 20, the temperature of the air blown out from the blow-out passages 301 and 302 provided in the upper part of the air-conditioning case 2 is changed to the blow-out passage provided in the side part of the air-conditioning case 2. The temperature can be made lower or higher than the temperature of the air blown out from 303. Such an air conditioner 1 is advantageous because, for example, the temperature of air blown into the vehicle interior from each outlet can be set to a temperature suitable for each operation mode.

  Hereinafter, the drive gear mechanism 10 will be described in more detail.

  As shown in FIGS. 5 and 6, the drive gear 20 has a plurality of drive gear portions 21 and 22 having different reference circle diameters. Each of the drive gear units 21 and 22 is a gear that rotates about the rotation axis Ax, and is arranged along the direction in which the rotation axis Ax extends, as shown in FIG. The upper driven gear 30 has a plurality of driven gear portions 31 and 32 having different reference circle diameters. The driven gear portions 31 and 32 are gears that rotate about the rotation axis Bx, and are provided corresponding to the plurality of drive gear portions 21 and 22, as shown in FIG.

  In the example shown in FIGS. 4 and 5, the drive gear 20 has a first drive gear unit 21 and a second drive gear unit 22. As shown in FIG. 6, the reference circle diameters of the first drive gear portion 21 and the second drive gear portion 22 are reference circle diameters R21 and R22, respectively.

  Further, as shown in FIGS. 5 and 6, the upper driven gear 30 has a first driven gear portion 31 and a second driven gear portion 32. As shown in FIG. 2, the first driven gear portion 31 is arranged on the same plane as the first drive gear portion 21, and as shown in FIG. 6, the reference circular diameter of the first drive gear portion 21 It has a reference circle diameter R31 corresponding to R21. As shown in FIG. 2, the second driven gear portion 32 is arranged on the same plane as the second drive gear portion 22. As shown in FIG. It has a reference circle diameter R32 corresponding to the circle diameter R22.

  The drive gear 20 and the upper driven gear 30 are meshed with the first drive gear 21 and the first driven gear 31 depending on the rotation phase of the drive gear 20, or the second driven gear 22 and the second driven gear The gear part 32 is designed to mesh with the gear part 32. In the illustrated example, the reference circle diameter R21 of the first drive gear portion 21 is larger than the reference circle diameter R22 of the second drive gear portion 22, and correspondingly, the reference circle diameter R31 of the first driven gear portion 31 is , The second driven gear portion 32 is smaller than the reference circle diameter R32. Therefore, depending on the rotation phase of the drive gear 20, the drive gear portion 21 having a large reference circle diameter and the driven gear portion 31 having a small reference circle diameter mesh with each other, or the drive gear portion 22 having a small reference circle diameter and the reference gear diameter are engaged. And the driven gear portion 32 having a large diameter. Thus, the rotation speed of the upper driven gear 30 with respect to the rotation speed of the drive gear 20 changes according to the rotation phase of the drive gear 20. Hereinafter, the engagement between the first drive gear unit 21 and the first driven gear unit 31 is also referred to as “first engagement”, and the engagement between the second drive gear unit 22 and the second driven gear unit 32 is referred to as “second engagement”. Also called "meshing".

  As shown in FIG. 6, the first drive gear unit 21 and the second drive gear unit 22 are respectively composed of disk-shaped main bodies 21 a and 22 a connected to the driving force transmission shaft 20 </ b> S, and main bodies 21 a and 22 a. A plurality of teeth 21b, 22b provided on the outer peripheral edges 21ae, 22ae. Further, the first driven gear portion 31 and the second driven gear portion 32 are provided on disk-shaped main bodies 31a, 32a connected to the upper shaft 7, and outer peripheral edges 31ae, 32ae of the main bodies 31a, 32a, respectively. A plurality of teeth 31b and 32b.

  The plurality of teeth 21b of the first drive gear unit 21 and the plurality of teeth 31b of the first driven gear unit 31 are in the entire range of the rotational phase of the drive gear 20 (the upper air mix door 6 is moved from the upper first position to the upper second position). Of the rotational phase in which the drive gear 20 rotates when the lower air mix door 8 is moved from the lower first position to the lower second position). Are provided so as to mesh with each other. On the other hand, the plurality of teeth 22 b of the second drive gear unit 22 and the plurality of teeth 32 b of the second driven gear unit 32 are different from the first rotational phase range of the entire rotational phase range of the drive gear 20. Are provided so as to mesh with each other in the rotation phase range of.

  The above-described first meshing is performed by the plurality of teeth 21b of the first drive gear unit 21 and the plurality of teeth 31b of the first driven gear unit 31. When the drive gear 20 rotates clockwise or counterclockwise, the rotational drive force of the actuator 11 is transmitted from the plurality of teeth 21 b of the first drive gear section 21 to the plurality of teeth 31 b of the first driven gear section 31. It is transmitted via the shaft 20S. Hereinafter, in at least one of the clockwise and counterclockwise rotations of the drive gear 20, the plurality of teeth 21 b of the first drive gear unit 21 and the first driven gear unit 31 that contribute to the transmission of the rotational driving force of the actuator 11 The plurality of teeth 31b are also referred to as “teeth that contribute to the first meshing”.

  Further, the above-described second meshing is performed by the plurality of teeth 22b of the second drive gear portion 22 and the plurality of teeth 32b of the second driven gear portion 32. When the drive gear 20 rotates clockwise or counterclockwise, the rotational drive force of the actuator 11 transmits the drive force from the teeth 22 b of the second drive gear portion 22 to the teeth 32 b of the second driven gear portion 32. It is transmitted via the shaft 20S. Hereinafter, in at least one of the clockwise and counterclockwise rotations of the drive gear 20, the plurality of teeth 22 b of the second drive gear portion 22 and the second driven gear portion 32 that contribute to the transmission of the rotational driving force of the actuator 11 The plurality of teeth 32b are also referred to as “teeth that contribute to the second meshing”.

  As shown in FIGS. 4 and 5, the drive gear 20 further has a rack gear portion 23. The rack gear unit 23 is configured as a single gear, and rotates around a rotation axis Ax. As shown in FIG. 2, the rack gear 23 is arranged alongside the drive gears 21 and 22 along the direction in which the rotation axis Ax extends. The rack gear portion 23 meshes with the rack 40 in the entire range of the rotation phase of the drive gear 20. Thus, the rack 40 moves upward or downward at a constant speed in the entire range of the rotation phase of the drive gear 20.

  4 and 5, the lower driven gear 50 that meshes with the rack 40 is configured as a single gear. The lower driven gear 50 rotates in the entire range of the rotational phase of the lower driven gear 50 (when the lower air mix door 8 is moved from the lower first position to the lower second position, the lower driven gear 50 rotates. In the entire range of the rotation phase), the rack meshes with the rack 40 that moves at the above-mentioned constant speed. For this reason, the lower driven gear 50 rotates at a constant rotational speed in the entire range of the rotational phase of the lower driven gear 50 (therefore, in the entire range of the rotational phase of the drive gear 20).

  With the drive gear mechanism 10 configured as described above, the rotation speed of the upper driven gear 30 with respect to the rotation speed of the lower driven gear 50 changes depending on the rotation phase of the drive gear 20.

  By the way, in such a drive gear mechanism 10, while the drive gear 20 rotates in the entire range of the rotation phase, the mesh between the drive gear 20 and the upper driven gear 30 is changed from the first mesh to the second mesh, or , From the second mesh to the first mesh. That is, the teeth meshing with the drive gear 20 and the upper driven gear 30 are changed from the teeth 21b of the first drive gear 21 and the teeth 31b of the first driven gear 31 to the teeth of the second drive gear 22. 22b and a plurality of teeth 32b of the second driven gear portion 32. Alternatively, from the plurality of teeth 22b of the second drive gear portion 22 and the plurality of teeth 32b of the second driven gear portion 32, the plurality of teeth 21b of the first drive gear portion 21 and the plurality of teeth 31b of the first driven gear portion 31 Changes to

  Here, as described above, even if the combination of the gears that mesh with each other while the drive gear 20 and the upper driven gear 30 rotate is changed, the distance between the assembly positions of the drive gear 20 and the upper driven gear 30 with respect to the air conditioning case 2 is appropriate. With a proper distance, the drive gear 20 and the upper driven gear 30 can continue to rotate as desired. The appropriate distance is defined as a distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 during the first meshing, and the reference circle diameter R21 of the first drive gear unit 21. And a reference circle diameter R31 of the first driven gear portion 31. During the second engagement, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is equal to the reference circular diameter R22 of the second drive gear part 22 and the second driven gear part. The distance is the sum of the reference circle diameter R32 and the reference circle diameter R32. Here, in the illustrated example, the sum of the reference circle diameter R21 of the first drive gear portion 21 and the reference circle diameter R31 of the first driven gear portion 31, the reference circle diameter R22 of the second drive gear portion 22, and the second The sum of the driven gear portion 32 and the reference circle diameter R32 is equal.

  In addition, even if a dimension error or an assembly error occurs in the drive gear mechanism 10, and the distance between the assembly positions of the drive gear 20 and the upper driven gear 30 with respect to the air-conditioning case 2 becomes shorter than the above-described appropriate distance, the drive gear 20 And the upper driven gear 30 make a first meshing, and the teeth 21b of the first driving gear portion 21 and the teeth 31b of the first driven gear portion 31 are in contact at a plurality of contact locations (for example, at two or more locations). Drive gear 20 and upper driven gear 30 can continue to rotate as desired. This is because, when the teeth of the drive gear 20 and the teeth of the upper driven gear 30 are in contact with each other at a plurality of locations, the stress that prevents the drive gear 20 and the upper driven gear 30 from approaching each other works sufficiently. This is because the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is maintained at a distance suitable for the drive gear 20 and the upper driven gear 30 to continue rotating. Similarly, the drive gear 20 and the upper driven gear 30 are in a second mesh, and the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 are in contact at a plurality of contact points. If (e.g., contact is made at two or more locations), drive gear 20 and upper driven gear 30 can continue to rotate as desired.

  The factors that cause dimensional errors and assembly errors in the drive gear mechanism 10 include the fact that the air conditioning case 2 in which the drive gear 10 is disposed may be deformed because it is generally a resin molded product, and the drive gear 20 and the driven gear 20 may be deformed. There is a case where a resin material is used to reduce the weight of the drive gear 30, and that the position of the rotation axis Ax of the drive gear 20 is affected by a mounting position of the actuator 11. Such dimensional errors and assembly errors are caused by the teeth 21b of the first drive gear portion 21, the teeth 31b of the first driven gear portion 31, the teeth 22b of the second drive gear portion 22, the teeth 32b of the second driven gear portion 32, Is relatively larger than the dimensional tolerance of each tooth.

  Now, when the meshing between the driving gear 20 and the upper driven gear 30 shifts from the first meshing to the second meshing, the contact between the teeth 21b of the first driving gear portion 21 and the teeth 31b of the first driven gear portion 31 is performed. The location is reduced. Further, when shifting from the second meshing to the first meshing, the number of contact points between the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 is reduced.

  For example, when the engagement between the drive gear 20 and the upper driven gear 30 shifts from the first engagement to the second engagement, the drive gear 20 rotates clockwise, and the upper driven gear 30 rotates counterclockwise. As a result, the plurality of teeth 21b of the first drive gear unit 21 and the plurality of teeth 31b of the first driven gear unit 31 are sequentially meshed and in contact with each other while the rotation axis Ax of the drive gear 20 and the upper driven gear 30 It passes on an axis L connecting the rotation axis Bx. Then, after passing on the axis L, the teeth 21b and 31b are sequentially separated from each other. Even if the teeth 21b and 31b passing on the center line L are separated from each other, if there are teeth 21b and 31b newly meshing with the first drive gear portion 21 and the first driven gear portion 31, the first drive gear The contact point between the portion 21 and the first driven gear portion 31 does not decrease. However, among the plurality of teeth 21b contributing to the first meshing of the first drive gear portion 21, the last tooth 21bx passing on the inter-axis line L meshes with the corresponding tooth of the first driven gear portion 31 (contact). After that, the first driving gear portion 21 and the first driven gear portion 31 do not have the newly meshing teeth 21b, 31b. Therefore, the number of contact points between the first drive gear unit 21 and the first driven gear unit 31 decreases.

  When the meshing between the driving gear 20 and the upper driven gear 30 shifts from the second meshing to the first meshing, the driving gear 20 rotates counterclockwise, and the upper driven gear 30 rotates clockwise. As a result, the plurality of teeth 22b of the second drive gear portion 22 and the plurality of teeth 32b of the second driven gear portion 32 pass over the inter-axis line L while meshing and contacting one another. Then, after passing on the axis L, the teeth 21b and 31b are sequentially separated from each other. Even if the teeth 22b and 32b that have passed on the axis L are separated from each other, if there are teeth 22b and 32b that newly mesh with the second drive gear portion 22 and the second driven gear portion 32, the second drive gear The contact point between the portion 22 and the second driven gear portion 32 does not decrease. However, among the plurality of teeth 22b contributing to the second meshing of the second drive gear portion 22, the last tooth 22by passing on the center line L meshes with the corresponding tooth of the second driven gear portion 32 (contact). After that, the second drive gear portion 22 and the second driven gear portion 32 have no newly meshing teeth 22b, 32b. Therefore, the number of contact points between the second drive gear portion 22 and the second driven gear portion 32 is reduced.

  As described above, the contact point between the teeth 21b of the first drive gear unit 21 and the teeth 31b of the first driven gear unit 31, or the teeth 22b of the second drive gear unit 22 and the teeth 32b of the second driven gear unit 32 When the contact position of the drive gear 20 and the upper driven gear 30 is short, the distance between the teeth 21b and 22b of the drive gear 20 and the teeth 31b and 32b of the upper driven gear 30 is reduced. , Such as a stress that prevents approaching each other does not work sufficiently. For this reason, the drive gear 20 and the upper driven gear 30 approach each other.

  If the drive gear 20 and the upper driven gear 30 are too close, the following problem occurs. That is, when shifting from the first meshing to the second meshing, the teeth 22b and 32b of the second drive gear portion 22 and the second driven gear portion 32 that are to be newly meshed come into contact with each other, and the second meshing is performed. Not done. Specifically, when the drive gear 20 and the upper driven gear 30 approach each other, when shifting from the first meshing to the second meshing, the teeth 22b of the second driving gear portion 22 that is to newly mesh with each other are shifted. , Comes into contact with the tip (top) of the tooth 32b of the second driven gear portion 32 that is to be newly engaged. Then, the rotation of the drive gear 20 stops, and it is not possible to shift to the second meshing. As described above, the state in which the continuous engagement and separation of the respective teeth 21 and 31 of the first drive gear portion 21 and the second drive gear portion 31 are stopped due to unexpected contact between the gears is locked. Sometimes called a state. Further, when shifting from the second meshing to the first meshing, the teeth 21b and 31b of the first driving gear portion 21 and the first driven gear portion 31 to be newly meshed with each other collide, and the first meshing is performed. Not done.

  In consideration of the above circumstances, in the illustrated example, when shifting from the first meshing to the second meshing or when shifting from the second meshing to the first meshing, the driving gear 20 The drive gear 20 and the upper driven gear 30 are configured as follows so that the upper driven gear 30 does not approach the upper driven gear 30 too much. The drive gear 20 and the upper driven gear 30 are configured as follows to prevent the gears 20 and 30 from being locked.

  In other words, of the plurality of teeth 21b, 31b of the first drive gear portion 21 and the first driven gear portion 31, when the first meshing shifts to the second meshing, the last one passing on the inter-axis line L is used. The radial distance Ltx from the tip of the first end tooth 31bx to the rotation axis Bx of the gear portion 31 having the first end tooth 31bx, and the tip of the first end tooth 31bx and the centerline L The sum of the radial distance Lsx from the surface 21ax of the main body 21a of the gear 21 facing above to the rotation axis Ax of the gear 21 having the main body 21a is equal to the reference circle diameter R22 of the second drive gear 22. And the reference circle diameter R32 of the second driven gear portion 32 or more.

  In the example illustrated in FIG. 6, the surface 21ax of the main body 21a facing the tip of the first end tooth 31bx is the second tooth 31b of the gear portion 31 having the first end tooth 31bx. A radial direction of a circle centered on the rotation axis Ax of the gear portion 21 rather than a surface 21as of the main body portion 21a of the gear portion 21 facing the tooth tip of the teeth other than the tooth 31bx at the first end on the center line L. It is located outside. Even when the plurality of teeth 31b of the first driven gear portion 31 have the same shape as the first end teeth 31bx, the tips of the plurality of teeth 31b are in contact with the surface 21as of the main body portion 21a of the first drive gear 21. Therefore, it is possible to prevent the gears 20 and 30 from being locked while facilitating the manufacture of the first driven gear portion 31.

  More specifically, the main body portion 21a of the gear portion 21 that meshes with the gear portion 31 having the first end tooth 31bx is located at a position facing the tip of the first end tooth 31bx. It has a protruding portion 21az that protrudes radially outward of a circle centered on the rotation axis Ax. By providing the protruding portion 21az, the surface 21ax of the main body portion 21a of the first drive gear portion 21 facing the tip of the first end tooth 31bx becomes the above-described surface of the main body portion 21a of the gear portion 21. 21as is located radially outward of a circle centered on the rotation axis Ax.

  In addition, in the example shown in FIG. 6, the surface 21ax of the main body 21a facing the tip of the first end tooth 31bx extends from the outer peripheral edge 21ae of the main body 21a having the surface 21ax to the rotation axis Ax. It is located radially outside a circle centered on the rotation axis Ax from the point where the radial distance is the shortest. More specifically, in the example shown in FIG. 6, the shape of the outer peripheral edge 21ae of the main body 21a is substantially circular, and the radial distance from the outer peripheral edge 21ae of the main body 21a to the rotation axis Ax is determined by the protrusion 21az. Except for the provided area, it is equal at any point on the outer peripheral edge 21ae. Therefore, the surface 21ax of the main body 21a facing the tip of the first end tooth 31bx may be located at an arbitrary point (for example, a protrusion) on the outer peripheral edge 21ae of the main body 21a other than the area where the protrusion 21az is provided. (A point near the portion 21az) is located radially outward of a circle centered on the rotation axis Ax.

  Since the first drive gear portion 21 and the first driven gear portion 31 are configured as described above, the distance between the drive gear 20 and the upper driven gear 30 at the assembly position is shorter than the distance suitable for the second engagement. Even in this case, it is possible to prevent the distance between the driving gear 20 and the upper driven gear 30 from being too close to perform the second meshing when shifting from the first meshing to the second meshing. Is done. That is, the gears 20 and 30 are prevented from being locked. That is, according to the first drive gear portion 21 and the first driven gear portion 31, when the distance between the assembly positions is short, the plurality of teeth 21 b of the first drive gear portion 21 contributing to the first meshing. Finally, after the tooth 21bx that passes on the inter-axis line L meshes with the corresponding tooth of the first driven gear portion 31, the tooth tip of the first end tooth 31bx contacts the surface 21ax of the protruding portion 21az. Will be in contact with you. As a result, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is the sum of the reference circle diameter R22 of the second drive gear section 22 and the reference circle diameter R32 of the second driven gear section 32. Shorter than that. That is, the distance between the drive gear 20 and the upper driven gear 30 is prevented from being shorter than the distance suitable for the second meshing. As a result, the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 can perform the second engagement without colliding with each other.

  Further, in the example shown in FIG. 6, among the plurality of teeth 22b, 32b of the second drive gear portion 22 and the second driven gear portion 32, when the transition from the second meshing to the first meshing is performed, the center line L is set. The radial distance Lty from the tip of the second end tooth 22by that passes lastly to the rotation axis Ax of the gear portion 22 having the second end tooth 22by, and the second end tooth 22by The sum of the radial distance Lsy from the surface 32ay of the main body portion 32a of the gear portion 32 facing the tooth tip on the center line L to the rotation axis Bx of the gear portion 32 having the main body portion 32a is the first drive. It is equal to or greater than the sum of the reference circle diameter R21 of the gear portion 21 and the reference circle diameter R31 of the first driven gear portion 31.

  In the example shown in FIG. 6, the surface 32ay of the main body portion 32a facing the tip of the second end tooth 22by is the second tooth 22b of the plurality of teeth 22b of the gear portion 22 having the second end tooth 22by. Radially outside of a circle centered on the rotation axis Bx of the gear portion 32 than the surface 32as of the main body portion 32a of the gear portion 32 facing the tooth tip of the tooth other than the end tooth 22by on the axis L. It is located in. Even when the plurality of teeth 22b of the second drive gear portion 22 are configured to have the same shape as the second end teeth 22by, the tips of the plurality of teeth 22b are in contact with the surface 32as of the main body portion 31a of the second driven gear 32. This makes it possible to prevent the gears 20 and 30 from being locked while facilitating the manufacture of the second drive gear portion 22.

  More specifically, the main body portion 32a of the gear portion 32 that meshes with the gear portion 22 having the second end tooth 22by is located at a position facing the tip of the second end tooth 22by. It has a protruding portion 32az that protrudes radially outward of a circle centered on the rotation axis Bx. By providing the protruding portion 32az, the surface 32ay of the main body portion 32a of the second driven gear portion 32 facing the tip of the tooth 22by at the second end is the surface of the main body portion 32a of the gear portion 32. 32as is located radially outside a circle centered on the rotation axis Bx.

  In the example shown in FIG. 6, the surface 32ay of the main body portion 32a facing the tip of the second end tooth 22by extends from the outer peripheral edge 32ae of the main body portion 32a having the surface 32ay to the rotation axis Bx. It is located radially outside a circle centered on the rotation axis Bx from the point where the radial distance is the shortest. More specifically, in the example shown in FIG. 6, the outer peripheral edge 32ae of the main body 32a has a substantially circular shape, and the radial distance from the outer peripheral edge 32ae of the main body 32a to the rotation axis Bx is determined by the protrusion 32az. Except for the provided area, it is equal at any point on the outer peripheral edge 32ae. Therefore, the surface 32ay of the main body portion 32a facing the tip of the second end tooth 22by may be positioned at any point (for example, the protruding portion) on the outer peripheral edge 32ae of the main body portion 32a other than the region where the protruding portion 32az is provided. (A point near the portion 32az) is located radially outward of a circle centered on the rotation axis Bx.

  Since the second drive gear portion 22 and the second driven gear portion 32 are configured as described above, the distance between the mounting positions of the drive gear 20 and the upper driven gear 30 is shorter than the distance suitable for the first engagement. Even in this case, when the transition from the second meshing to the first meshing is performed, it is prevented that the distance between the drive gear 20 and the upper driven gear 30 is too close to perform the first meshing. Is done. That is, according to the second drive gear portion 22 and the second driven gear portion 32, when the distance between the assembly positions is short, the plurality of teeth 22b of the second drive gear portion 22 that contribute to the second engagement are provided. Finally, after the tooth 22by (the same tooth as the second end tooth 22by in the example shown in FIG. 6) passing on the inter-axis line L meshes with the corresponding tooth of the second driven gear portion 32, The tip of the tooth 22by at the second end comes into contact with the surface 32ay of the protruding portion 32az. As a result, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is the sum of the reference circle diameter R21 of the first drive gear section 21 and the reference circle diameter R31 of the first driven gear section 31. Shorter than that. That is, the distance between the driving gear 20 and the upper driven gear 30 is prevented from being shorter than the distance suitable for the first meshing. As a result, the teeth 21b of the first drive gear portion 21 and the teeth 31b of the first driven gear portion 31 can perform the first engagement without colliding with each other.

  In the example shown in FIG. 6, among the plurality of teeth 21 b of the first drive gear unit 21, when the first meshing shifts from the first meshing to the second meshing, the tooth that last passes on the center line L, The first end tooth 31bx is a different tooth. However, the tooth at the first end may be one of the teeth 21b of the first drive gear unit 21. In this case, among the plurality of teeth 21b of the first drive gear portion 21, when the first meshing shifts from the first meshing to the second meshing, the tooth that last passes on the interaxial line L, and the tooth at the first end. Are the same teeth. Further, among the plurality of teeth 22b of the second drive gear portion 22, the tooth that last passes on the center line L when shifting from the second meshing to the first meshing, and the tooth 22by at the second end. Are the same teeth. However, the second end tooth may be one of the plurality of teeth 32b of the second driven gear portion 32. In this case, among the plurality of teeth 22b of the second drive gear portion 22, when shifting from the second meshing to the first meshing, the tooth that last passes on the axis L and the tooth at the second end Will be different teeth.

  In addition, such a drive door mechanism 10 can also be adopted as a drive door mechanism that drives the shafts 301s, 302s, and 303s of the outlet passage doors 301D, 302D, and 303D.

  Next, referring to FIGS. 7A to 8C, the drive gear 20 and the upper driven gear at the time of transition from the first meshing to the second meshing and at the time of shifting from the second meshing to the first meshing. The operation of 30 will be described. Here, the distance between the mounting positions of the driving gear 20 and the upper driven gear 30 is shorter than the distance suitable for the first meshing due to an assembling error occurring in the driving gear mechanism 10 and the like, and the distance between the second meshing and the second meshing is reduced. The case where the distance is shorter than an appropriate distance will be described as an example.

  First, the operation of the drive gear 20 and the upper driven gear 30 when shifting from the first meshing to the second meshing will be described with reference to FIGS. 7A to 7C. 7A to 7C, the contact points between the teeth 21b and 31b of the first drive gear unit 21 and the first driven gear unit 31 are indicated by black triangles, and the teeth 22b of the second drive gear unit 22 and the second driven gear unit 32 are shown. , 32b are indicated by open triangles.

  First, as shown in FIG. 7A, a first mesh is formed between the drive gear 20 and the upper driven gear 30, and the teeth 21 b of the first drive gear 21 and the teeth 31 b of the first driven gear 31 are in contact with each other. Are engaged. In this state, when the actuator 11 is operated to rotate the drive gear 20 clockwise, the upper driven gear 30 rotates counterclockwise accordingly. Then, the plurality of teeth 21b of the first drive gear portion 21 and the plurality of teeth 31b of the first driven gear portion 31 that contribute to the first meshing pass alternately on the center line L. During this time, the teeth 21b and 31b of the first drive gear portion 21 and the first driven gear portion 31 are in contact at a plurality of contact locations (two locations in the illustrated example). For this reason, between the teeth 21b and 31b that come into contact, a force that pushes each other (stress that suppresses approach) acts sufficiently. The distance between the drive gear 20 and the upper driven gear 30 is adjusted to a distance suitable for the first meshing (the rotation axis Ax of the drive gear 20 and the rotation of the upper driven gear 30 by the force of pressing the teeth 21b and the teeth 31b). The distance from the axis Bx is maintained to be the sum of the reference circle diameter R21 of the first drive gear portion 21 and the reference circle diameter R31 of the first driven gear portion 31).

  Then, as the drive gear 20 and the upper driven gear 30 continue to rotate, the tooth 21 bx that last passes on the interaxial line L among the plurality of teeth 21 b of the first drive gear unit 21 becomes the first driven gear unit 31. Meshes with (contacts) the corresponding tooth. In this state, the teeth 21bx approach the center line L. At the same time, of the plurality of teeth 21b, 31b of the first drive gear portion 21 and the first driven gear portion 31, the first end tooth 31bx that passes last on the center line L approaches the center line L. . Here, as described above, after the tooth 21bx comes into contact with the corresponding tooth of the first driven gear portion 31, the first drive gear portion 21 and the first driven gear portion 31 newly mesh (contact). The teeth 21b and 31b do not exist. For this reason, as shown in FIG. 7B, when the drive gear 20 and the upper driven gear 30 continue to rotate, the contact points between the teeth 21b of the first drive gear 21 and the teeth 31b of the first driven gear 31 decrease. . When the number of contact points decreases, the force of pressing each other between the teeth 21b of the first drive gear portion 21 and the teeth 31b of the first driven gear portion 31 does not work sufficiently.

  However, as shown in FIG. 7B, after the teeth 21 bx come into contact with the corresponding teeth of the first driven gear portion 31, the tips of the teeth 31 bx at the first end are shifted from the main body portion 21 a of the gear portion 21 facing the first driven gear portion 31. It contacts the surface 21ax. As a result, the drive gear 20 and the upper driven gear 30 approach each other, and the distance between the drive gear 20 and the upper driven gear 30 is equal to a distance suitable for the second engagement (the distance between the rotation axis Ax and the rotation axis Bx is equal to the reference circle diameter R22 and the reference circle diameter R32). Is smaller than the distance which is the sum of As a result, the teeth 22b of the second drive gear section 22 and the teeth 32b of the second driven gear section 32 mesh with each other without hitting each other.

  Then, as shown in FIG. 7C, as the drive gear 20 and the upper driven gear 30 continue to rotate, the teeth 22b of the second drive gear portion 22 and the teeth 32 of the second driven gear portion 32 contact a plurality of contact points ( (Two places in the illustrated example). Thereby, the distance between the drive gear 20 and the upper driven gear 30 is a distance suitable for the second meshing (the distance between the rotation axis Ax and the rotation axis Bx is the sum of the reference circle diameter R22 and the reference circle diameter R32. Distance).

  Next, the operation of the drive gear 20 and the upper driven gear 30 when shifting from the second meshing to the first meshing will be described with reference to FIGS. 8A to 8C. 8A to 8C, the contact points between the teeth 22b and 32b of the second drive gear portion 22 and the second driven gear portion 32 are indicated by white triangles, and the teeth 21b of the first drive gear portion 21 and the first driven gear portion 31 are shown. , 31b are indicated by black triangles.

  First, as shown in FIG. 8A, a second mesh is formed between the drive gear 20 and the upper driven gear 30, and the teeth 22 b of the second drive gear portion 22 and the teeth 32 b of the second driven gear portion 32 are Are engaged. When the drive gear 20 is rotated counterclockwise by operating the actuator 11 in this state, the upper driven gear 30 is rotated clockwise accordingly. Then, the plurality of teeth 22b of the second drive gear portion 22 and the plurality of teeth 32b of the second driven gear portion 32 that contribute to the second meshing alternately pass on the center line L. During this time, the teeth 22b and 32b of the second drive gear portion 22 and the second driven gear portion 32 are in contact at a plurality of contact locations (two locations in the illustrated example). For this reason, between the contacting teeth 22b and 32b, a pressing force (a stress for preventing approach) is sufficiently applied. The distance between the drive gear 20 and the upper driven gear 30 is set to a distance suitable for the second meshing (the distance between the rotation axis Ax and the rotation axis Bx is equal to the reference circle diameter by the force of pressing the teeth 22b and the teeth 32b). R22 and the reference circle diameter R32).

  Then, as the drive gear 20 and the upper driven gear 30 continue to rotate, the tooth 22by that last passes on the inter-axis line L among the plurality of teeth 21b of the second drive gear portion 22 is moved to the second driven gear portion 32. Meshes with (contacts) the corresponding tooth. In this state, the teeth 22by approach the center line L. The tooth 22by lasts on the interaxial line L when shifting from the second engagement to the first engagement among the plurality of teeth 22b, 32b of the second drive gear portion 22 and the second driven gear portion 32. It is also the passing second end tooth 22by. Here, as described above, after the tooth 22by comes into contact with the corresponding tooth of the second driven gear portion 32, the second drive gear portion 22 and the second driven gear portion 32 newly mesh (contact) with the tooth. 22b and 32b do not exist. For this reason, as shown in FIG. 8B, as the drive gear 20 and the upper driven gear 30 continue to rotate, the contact points between the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 decrease. . When the number of contact points is reduced, the pressing force between the teeth 22b of the second drive gear portion 22 and the teeth 32b of the first driven gear portion 32 does not work sufficiently.

  However, as shown in FIG. 8B, after the tooth 22by comes into contact with the corresponding tooth of the second driven gear portion 32, the tip of the tooth (the second end tooth) 22by is moved to the main body of the facing gear portion 32. It contacts the surface 32ay of the portion 32a. As a result, the drive gear 20 and the upper driven gear 30 approach each other, and the distance between the drive gear 20 and the upper driven gear 30 is a distance suitable for the first engagement (the distance between the rotation axis Ax and the rotation axis Bx is equal to the reference circle diameter R21 and the reference circle diameter R31). Is smaller than the distance which is the sum of Thus, the teeth 21b of the first drive gear 21 and the teeth 31b of the first driven gear 31 mesh with each other without hitting each other.

  Then, as shown in FIG. 8C, as the drive gear 20 and the upper driven gear 30 continue to rotate, the teeth 21b of the first drive gear portion 21 and the teeth 31 of the first driven gear portion 31 contact a plurality of contact points ( (Two places in the illustrated example). Accordingly, the distance between the drive gear 20 and the upper driven gear 30 is a distance suitable for the first engagement (the distance between the rotation axis Ax and the rotation axis Bx is the sum of the reference circle diameter R21 and the reference circle diameter R31. Distance).

<Modification 1>
Next, a first modification of the drive gear mechanism 10 in the above-described first embodiment will be described with reference to FIGS. FIG. 9 is a side view showing the drive gear 20 and the upper driven gear 30 of the drive gear mechanism 10 according to the first modification. FIG. 10 is a partially enlarged view for explaining the operation of the drive gear 20 and the upper driven gear 30 when shifting from the first meshing to the second meshing, and FIG. FIG. 7 is a partially enlarged view for explaining the operation of the drive gear 20 and the upper driven gear 30 when shifting to the first meshing.

  In the modified example 1 shown in FIGS. 9 to 11, compared to the drive gear mechanism 10 shown in FIGS. 1 to 8C, the main body portion 21 a of the gear portion 21 that meshes with the gear portion 31 having the first end teeth 31 bx is provided. The point where the protruding portion 21az is not provided, and the point where the first end tooth 31bx extends radially outward from the other teeth 31b of the gear portion 31 having the first end tooth 31bx. Is different. Further, the point that the protruding portion 32az is not provided on the main body portion 32a of the gear portion 32 that meshes with the gear portion 22 having the second end teeth 22by, and that the second end teeth 22by correspond to the second end The gear portion 22 having the teeth 22by of the first embodiment extends radially outward from the other teeth 22b. Other configurations are substantially the same as those of the air conditioner 1 shown in FIGS. 1 to 8C. In Modification Example 1 shown in FIGS. 9 to 11, the same parts as those in the embodiment shown in FIGS. 1 to 8C are denoted by the same reference numerals, and detailed description is omitted. In FIG. 10, the contact points between the teeth 21 b and 31 b of the first drive gear unit 21 and the first driven gear unit 31 are indicated by black triangles. In FIG. 11, the contact points between the teeth 22 b and 32 b of the second drive gear unit 22 and the second driven gear unit 32 are indicated by white triangles.

  In the example illustrated in FIG. 9, the tip of the first end tooth 31bx is the tip of the teeth other than the first end tooth 31bx among the plurality of teeth 31b of the gear portion 31 having the first end tooth 31bx. It is located outside the tooth tip in the radial direction of a circle centered on the rotation axis Bx of the gear portion 31. Thereby, the radial distance Ltx from the tip of the first end tooth 31bx to the rotation axis Bx of the gear portion 31 having the first end tooth 31bx, the tip of the first end tooth 31bx, The sum of the radial distance Lsx from the surface 21ax of the main body portion 21a of the gear portion 21 facing on the axis L to the rotation axis Ax of the gear portion 21 having the main body portion 21a is equal to the sum of the second drive gear portion 22 It is equal to or greater than the sum of the reference circle diameter R22 and the reference circle diameter R32 of the second driven gear portion 32.

  More specifically, the surface 21ax of the main body portion 21a of the gear portion 21 facing the tip of the first end tooth 31bx on the center line L is the surface of the main body portion 21a of the first drive gear portion 21. 21as is located on the same circle with the rotation axis Ax as the center. On the other hand, the teeth 31bx of the first end are larger than the tips of the teeth other than the teeth 31bx of the first end among the plurality of teeth 31b of the gear portion 31 having the teeth 31bx of the first end. The gear portion 31 has an extending portion 31bz extending radially outward of a circle centered on the rotation axis Bx of the gear portion 31. By providing the extension portion 31bz, the tip of the first end tooth 31bx becomes the first end tooth among the plurality of teeth 31b of the gear portion 31 having the first end tooth 31bx. It is located radially outward of a circle centered on the rotation axis Bx of the gear portion 31 from the tip of the teeth other than 31bx.

  Since the first drive gear portion 21 and the first driven gear portion 31 are configured as described above, the distance between the drive gear 20 and the upper driven gear 30 at the assembly position is shorter than the distance suitable for the second engagement. Even in this case, it is possible to prevent the distance between the driving gear 20 and the upper driven gear 30 from being too close to perform the second meshing when shifting from the first meshing to the second meshing. Is done. That is, according to the first drive gear portion 21 and the first driven gear portion 31, as shown in FIG. 10, when the distance between the assembly positions is short, the first engagement shifts to the second engagement. In this case, among the plurality of teeth 21b of the first drive gear portion 21 contributing to the first meshing, the last tooth 21bx passing on the center line L meshes with the corresponding tooth of the first driven gear portion 31. Thereafter, the tip of the first end tooth 31bx comes into contact with the surface 21ax of the main body 21. As a result, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is the sum of the reference circle diameter R22 of the second drive gear section 22 and the reference circle diameter R32 of the second driven gear section 32. Shorter than that. That is, the distance between the drive gear 20 and the upper driven gear 30 is prevented from being shorter than the distance suitable for the second meshing. As a result, the teeth of the second drive gear portion 22 and the teeth of the second driven gear portion 32 can perform the second meshing without colliding with each other.

  In the example illustrated in FIG. 9, the tip of the second end tooth 22by is a tip other than the second end tooth 22by among the plurality of teeth 22b of the gear portion 22 having the second end tooth 22by. It is located radially outward of a circle centered on the rotation axis Ax of the gear portion 22 from the tip of the tooth. Accordingly, the radial distance Lty from the tip of the second end tooth 22by to the rotation axis Ax of the gear portion 22 having the second end tooth 22by, and the tip and the axis of the second end tooth 22by. The sum of the radial distance Lsy from the surface 32ay of the main body 32a of the gear 32 facing the intermediary line L to the rotation axis Bx of the gear 32 having the main body 32a is a reference of the first drive gear 21. It is equal to or greater than the sum of the circle diameter R21 and the reference circle diameter R31 of the first driven gear portion 31.

  More specifically, the surface 32ay of the main body portion 32a of the gear portion 32 facing the tip of the second end tooth 22by on the axis L is the same rotation axis Bx as the surface 32as of the main body portion 32a. Are located on a circle centered at. On the other hand, the teeth 22by of the second end are higher than the tips of the teeth other than the teeth 22by of the second end among the plurality of teeth 22b of the gear portion 22 having the teeth 22by of the second end. The gear portion 22 has an extending portion 22bz extending radially outward of a circle around the rotation axis Ax of the gear portion 22. By providing the extension portion 22bz, the tip of the second end tooth 22by becomes the second end tooth among the plurality of teeth 22b of the gear portion 22 having the second end tooth 22by. It is located radially outward of a circle centered on the rotation axis Ax of the gear portion 22 from the tip of the teeth other than 22 by.

  Since the second drive gear portion 22 and the second driven gear portion 32 are configured as described above, the distance between the mounting positions of the drive gear 20 and the upper driven gear 30 is shorter than the distance suitable for the first engagement. Even in this case, when the transition from the second meshing to the first meshing is performed, it is prevented that the distance between the drive gear 20 and the upper driven gear 30 is too close to perform the first meshing. Is done. That is, according to the second drive gear portion 22 and the second driven gear portion 32, as shown in FIG. 11, when the distance between the above-described mounting positions is short, the transition from the second engagement to the first engagement is performed. In this case, among the plurality of teeth 22b of the second drive gear portion 22 contributing to the second meshing, the tooth 22by passing on the center line L lastly meshes with the corresponding tooth of the second driven gear portion 32. Thereafter, the tip of the second end tooth 22by comes into contact with the surface 32ay of the main body 32a. As a result, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is the sum of the reference circle diameter R21 of the first drive gear section 21 and the reference circle diameter R31 of the first driven gear section 31. Shorter than that. That is, the distance between the driving gear 20 and the upper driven gear 30 is prevented from being shorter than the distance suitable for the first meshing. As a result, the teeth of the first drive gear portion 21 and the teeth of the first driven gear portion 31 can perform the first meshing without colliding with each other.

<Modification 2>
Next, a second modification of the drive gear mechanism 10 according to the above-described embodiment will be described with reference to FIG. FIG. 12 is a side view showing the drive gear 20 and the upper driven gear 30 of the drive gear mechanism 10 according to the second modification.

  In the modified example 2 shown in FIG. 12, compared to the drive gear mechanism 10 shown in FIGS. 1 to 8C, the first end teeth are provided on the drive gear 20, and the gear having the first end teeth is provided. The difference lies in that the gear section that meshes with the section is the upper driven gear 30 and that the teeth are provided over the entire circumference of each of the gear sections 21 and 22 of the drive gear 20. Other configurations are substantially the same as those of the air conditioner 1 shown in FIGS. 1 to 8C. In Modification Example 2 shown in FIG. 12, the same portions as those in the embodiment shown in FIGS. 1 to 8C are denoted by the same reference numerals, and detailed description is omitted.

  In the modification shown in FIG. 12, the teeth 21b and 21c are provided over the entire circumference of the main body 21a of the first drive gear unit 21. Further, teeth 22b and 22c are provided over the entire circumference of the main body 22a of the second drive gear unit 22. According to such a drive gear 20, when assembling the drive gear 20 and the upper driven gear 30 to the air conditioning case 2, it is not necessary to consider the angular position with respect to each other. Therefore, the assembling of the drive gear 20 and the upper driven gear 30 is facilitated.

  In addition, among the plurality of teeth 21b and 21c of the first drive gear unit 21, only the teeth 21b contribute to the first meshing. That is, only the teeth 21b come into contact with the plurality of teeth 31b of the first driven gear portion 31 when the driving gear 20 rotates clockwise or counterclockwise, and the rotation driving force of the actuator 11 is applied to the first driven gear portion 31. To communicate. The other teeth 21c do not contribute to the transmission of the rotational driving force to the first driven gear portion 31. Further, among the plurality of teeth 22b and 22c of the second drive gear portion 22, only the teeth 22b contribute to the second meshing. That is, only the teeth 22b contact the plurality of teeth 32b of the second driven gear portion 32 when the driving gear 20 rotates clockwise or counterclockwise, and the driving force of the actuator 11 is applied to the second driven gear portion 32. To communicate. The other teeth 22c do not contribute to the transmission of the rotational driving force to the second driven gear portion 32.

  In the modified example shown in FIG. 12, among the plurality of teeth 21 b and 31 b of the first driving gear portion 21 and the first driven gear portion 31, when shifting from the first meshing to the second meshing, on the axis L between the shafts. Are the teeth 21bx of the first drive gear unit 21 at the end. The surface of the main body of the gear portion facing the tip of the first end tooth 21bx on the center line L is the surface 31ax of the main body 31a of the first driven gear portion 31.

  In the example shown in FIG. 12, the surface 31ax of the main body 31a facing the tip of the first end tooth 21bx contributes to the first meshing of the gear portion 21 having the first end tooth 21bx. Of the teeth 21b, the rotation axis Bx of the gear portion 31 is more centered than the surface 31as of the main body portion 31a of the gear portion 31 facing the tip of the teeth other than the first end tooth 21bx on the center line L. Is located radially outside the circle. Accordingly, the radial distance Ltx from the tip of the first end tooth 21bx to the rotation axis Ax of the gear unit 21 having the first end tooth 21bx, and the tip and the axis of the first end tooth 21bx. The sum of the radial distance Lsx from the surface 31ax of the main body portion 31a of the gear portion 31 facing the intermediary line L to the rotation axis Bx of the gear portion 31 having the main body portion 31a is the reference of the second drive gear portion 22. It is equal to or greater than the sum of the circle diameter R22 and the reference circle diameter R32 of the second driven gear portion 32.

  More specifically, the main body portion 31a of the gear portion 31 that meshes with the gear portion 21 having the first end tooth 21bx is located at a position facing the tip of the first end tooth 21bx. It has a protruding portion 31az that protrudes radially outward of a circle centered on the rotation axis Bx. Since the protruding portion 31az is provided, the surface 31ax of the main body portion 31a of the first driven gear portion 31 facing the tip of the tooth 21bx of the first end is the surface of the main body portion 31a of the gear portion 31. It is located radially outward of a circle centered on the rotation axis Bx of the gear portion 31 than 31ax.

  In the example shown in FIG. 12, the surface 31ax of the main body 31a facing the tip of the first end tooth 21bx extends from the outer peripheral edge 31ae of the main body 31a having the surface 31ax to the rotation axis Bx. It is located radially outside a circle centered on the rotation axis Bx from the point where the radial distance is the shortest. More specifically, in the example shown in FIG. 12, the shape of the outer peripheral edge 31ae of the main body portion 31a is substantially circular, and the radial distance from the outer peripheral edge 31ae of the main body portion 31a to the rotation axis Bx is such that the protrusion 31az is Outside of the provided area, it is equal at any point on the outer peripheral edge 31ae. Therefore, the surface 31ax of the main body portion 31a facing the tip of the first end tooth 21bx may be at any point (for example, the protrusion (A point near the portion 31az) is located radially outward of a circle centered on the rotation axis Bx.

  In such a first drive gear portion 21 and a first driven gear portion 31 as well, when shifting from the first meshing to the second meshing, the teeth 21b contributing to the first meshing of the first driving gear portion 21 are formed. After the tooth 21bx that last passes through the inter-axis line L meshes with the corresponding tooth 31b of the first driven gear portion 31, the tip of the tooth (first end tooth) 21bx is brought into contact with the facing gear portion 31. Abuts on the surface 31ax of the main body 31a. For this reason, the drive gear 20 and the upper driven gear 30 approach each other, and the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 becomes smaller than the reference circle diameter R22 of the second drive gear portion 22 by the second diameter. 2 is prevented from being smaller than the sum of the reference gear diameter R32 and the driven gear portion 32. That is, the distance between the drive gear 20 and the upper driven gear 30 is prevented from becoming smaller than the distance suitable for the second meshing. Thus, the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 can mesh without hitting each other.

  As described above, the teeth at the first end may be provided on the first drive gear unit 21 or may be provided on the first driven gear unit 31. In other words, the protruding portion that abuts on the center line L with the tip of the first end tooth may be provided on the first drive gear portion 21 or may be provided on the first driven gear portion. .

  Similarly, the teeth at the second end may be provided on the second drive gear unit 22 or may be provided on the second driven gear unit 32. In other words, the protrusion that abuts on the center line L with the tip of the second end tooth may be provided on the second drive gear unit 22 or on the second driven gear unit 32. Good.

  In the example shown in FIG. 12, both the protruding portions 31az and 32az are provided on the upper driven gear 30. When the protrusion for keeping the distance between the drive gear 20 and the upper driven gear 30 at an appropriate distance is provided on only one of the gears, processing or processing for providing the protrusion is performed only on the gear of the one gear. Should be applied. For example, when the protrusion is provided on the upper driven gear 30, a highly versatile gear is used as the drive gear 20, and the protrusions 31az and 32az having dimensions corresponding to the dimensions of the drive gear 20 are provided on the upper driven gear 30. Good. This leads to an improvement in the productivity of the drive gear mechanism 10.

<Modification 3>
Next, a third modification of the drive gear mechanism 10 according to the embodiment will be described with reference to FIG. FIG. 13 is a side view showing the drive gear 20 and the upper driven gear 30 of the drive gear mechanism 10 according to the third modification.

  In the modified example 3 shown in FIG. 13, compared with the drive gear mechanism 10 shown in FIGS. 9 to 11, the second end teeth are provided in the second driven gear portion 32, and the second end teeth are provided. The second drive gear unit 22 is different from the first embodiment in that a gear unit that meshes with the gear unit having the second drive gear unit 22. Other configurations are substantially the same as those of the air conditioner 1 shown in FIGS. In Modification Example 3 shown in FIG. 13, the same parts as those in the embodiment shown in FIGS. 9 to 11 are denoted by the same reference numerals, and detailed description is omitted.

  In the modification shown in FIG. 13, among the plurality of teeth 21 b, 31 b of the second drive gear portion 22 and the second driven gear portion 32, when shifting from the second meshing to the first meshing, on the axis L. Is the tooth 32 by of the second driven gear portion 32 at the second end. The surface of the main body of the gear portion facing the tip of the second end tooth 32by on the center line L is the surface 22ay of the main body 22a of the second drive gear portion 22.

  In the example illustrated in FIG. 13, the tip of the second end tooth 32by is a tooth other than the second end tooth 32by among the plurality of teeth 32b of the gear portion 32 having the second end tooth 32by. It is located radially outward of a circle centered on the rotation axis Bx of the gear portion 32. Thus, the radial distance Lty from the tip of the second end tooth 32by to the rotation axis Bx of the gear portion 32 having the second end tooth 32by, and the tip and axis of the second end tooth 32by. The sum of the radial distance Lsy from the surface 22ay of the main body portion 22a of the gear portion 22 facing the intermediary line L to the rotation axis Ax of the gear portion 22 having the main body portion 22a is a reference of the first drive gear portion 21. It is equal to or greater than the sum of the circle diameter R21 and the reference circle diameter R31 of the first driven gear portion 31.

  More specifically, the surface 22ax of the main body portion 22a of the gear portion 22 facing the tip of the second end tooth 32by on the center line L is the surface of the main body portion 22a of the second drive gear portion 22. It is located on the same circle around the rotation axis Ax as 22as. On the other hand, the teeth 32by of the second end are higher than the tip of the teeth other than the teeth 32by of the second end among the plurality of teeth 32b of the gear portion 32 having the teeth 32by of the second end. The gear portion 32 has an extending portion 32bz extending radially outward of a circle centered on the rotation axis Bx of the gear portion 32. By providing the extension portion 32bz, the tip of the second end tooth 32by becomes the second end tooth of the plurality of teeth 32b of the gear portion 32 having the second end tooth 32by. It is located radially outward of a circle centered on the rotation axis Bx of the gear portion 32 from the tip of the teeth other than 32 by.

  Also in such a second drive gear portion 22 and a second driven gear portion 32, when the second meshing shifts from the second meshing to the first meshing, among the plurality of teeth 22b of the second driving gear portion 22, the shaft center last. After the teeth 22by passing through the line L mesh with the corresponding teeth of the second driven gear portion 32, the tips of the teeth 32by at the second end abut on the surface 22ay of the main body portion 22a of the gear portion 22 facing the same. . For this reason, the drive gear 20 and the upper driven gear 30 approach each other, and the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 becomes smaller than the reference circle diameter R21 of the first drive gear unit 21. The first driven gear portion 31 is prevented from being smaller than the sum of the first driven gear portion 31 and the reference circle diameter R31. That is, the distance between the drive gear 20 and the upper driven gear 30 is prevented from becoming smaller than the distance suitable for the first meshing. Thereby, the teeth 21b of the first drive gear portion 21 and the teeth 31b of the first driven gear portion 31 can mesh without hitting each other.

  As described above, the teeth at the second end having the extension may be provided on the second drive gear unit 22 or may be provided on the second driven gear unit 32. Similarly, the first end tooth having the extension may be provided on the first drive gear unit 21 or may be provided on the first driven gear unit 31.

  In addition, in the example shown in FIG. 13, both the extending portions 31 bz and 32 bz are provided on the upper driven gear 30. In the case where the extension for keeping the distance between the drive gear 20 and the upper driven gear 30 at an appropriate distance is provided in only one of the gears, the processing and processing for providing the extension are performed by the gear of the one gear. It only needs to be applied to the part. For example, when the extension portion is provided in the upper driven gear 30, a highly versatile gear is used as the drive gear 20, and the extension portions 31 bz and 32 bz having dimensions corresponding to the dimensions of the drive gear 20 are provided in the upper driven gear 30. Just do it. This leads to an improvement in the productivity of the drive gear mechanism 10.

  In the above-described first embodiment and the modified examples described above, the drive gear mechanism 10 includes the air passage 3 in the vehicle air conditioner 1 having the air conditioning case 2 forming the air passage 3 in which air flows. The drive gear mechanism 10 drives the doors 6 and 8 that change the flow of air flowing therethrough. The driving gear mechanism 10 is connected to an actuator 11 that generates a rotational driving force, a driving gear 20 that is rotationally driven by the actuator 11, and a shaft 7 that drives the doors 6 and 8. And a driven gear 30 that transmits the rotational driving force to the shaft 7. The drive gear 20 has a first drive gear portion 21 and a second drive gear portion 22 having different reference circle diameters R21 and R22. Further, the driven gear 30 includes a first driven gear portion 31 and a second driven gear portion having different reference circle diameters R31 and R32 provided corresponding to the first driving gear portion 21 and the second driving gear portion 22, respectively. 32. The engagement between the driving gear 20 and the driven gear 30 is determined by the first engagement between the first driving gear 21 and the first driven gear 31 or the second driving gear, depending on the rotation phase of the driving gear 20. This is achieved by the second engagement between the portion 22 and the second driven gear portion 32. The first drive gear portion 21 and the second drive gear portion 22 are respectively formed by main bodies 21a and 22a connected to the actuator 11 and a first driven gear 31 provided on the main bodies 21a and 22a. And a plurality of teeth 21b and 22b that contribute to the first meshing or the second meshing with the second driven gear portion 32. Further, the first driven gear portion 31 and the second driven gear portion 32 are respectively composed of main body portions 31a and 32a connected to the shaft 7, and the first drive gear portion 21 provided on the main body portions 31a and 32a. And a plurality of teeth 31b and 32b contributing to the first engagement with the second drive gear portion 22. Then, of the plurality of teeth 21b, 31b of the first drive gear portion 21 and the first driven gear portion 31, when shifting from the first mesh to the second mesh, the rotation axis Ax of the drive gear 20 and the driven gear 30 Of the gear units 21 and 31 having the first end teeth 21bx and 31bx from the tip end of the first end teeth 21bx and 31bx that last pass on the inter-axis line L connecting the rotation axis Bx of the first end. The radial distance Ltx to Ax, Bx and the main body part 31a from the surfaces 31ax, 21ax of the gear parts 31, 21 facing the tip of the first end teeth 21bx, 31bx on the center line L. The sum of the radial distance Lsx of the gear units 31 and 21 having the rotation axes Bx and Ax having the reference circle diameter R22 of the second drive gear unit 22 and the reference circle diameter R32 of the second driven gear unit 32 is equal to the reference circle diameter R32 of the second driven gear unit 32. Is greater than or equal to the sum of

  According to such a drive mechanism 10, even if a dimensional error or an assembly error occurs in the drive mechanism 10, the distance between the assembly positions of the drive gear 20 and the driven gear 30 is shortened. When shifting to the second meshing, the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 can mesh without colliding with each other.

  For example, the surfaces 31ax, 21ax of the body portions 31a, 21a facing the tips of the first end teeth 21bx, 31bx are formed by a plurality of teeth of the gear portions 21, 31 having the first end teeth 21bx, 31bx. Of the gears 31 and 21 facing the tooth tip of the teeth other than the first end teeth 21bx and 31bx on the interaxial line L, the surfaces 31as and 21as of the main bodies 31a and 21a of the gears 21 and 31b. The gears 31 and 21 are located radially outside a circle centered on the rotation axes Bx and Ax. By configuring the gear portions 31 and 21 meshing with the gear portions 21 and 31 having the first end teeth 21bx and 31bx in this manner, the sum of the radial distance Ltx and the radial distance Lsx can be reduced by the second. It can be greater than or equal to the sum of the reference circle diameter R22 of the drive gear portion 22 and the reference circle diameter R32 of the second driven gear portion 32.

  Also, for example, the surfaces 31ax, 21ax of the main bodies 31a, 21a facing the tips of the first end teeth 21bx, 31bx are on the outer peripheral edges 31ae, 21ae of the main bodies 31a, 21a having the surfaces 31ax, 21ax. Of the gear portions 31 and 21 having the main body portions 31a and 21a are located radially outside a circle centered on the rotation axes Bx and Ax from a point where the radial distance to the rotation axes Bx and Ax is shortest. are doing. By configuring the gear portions 31 and 21 meshing with the gear portions 21 and 31 having the first end teeth 21bx and 31bx in this manner, the sum of the radial distance Ltx and the radial distance Lsx can be reduced. It can be equal to or greater than the sum of the reference circle diameter R22 of the second drive gear portion 22 and the reference circle diameter R32 of the second driven gear portion 32.

  In the first embodiment or the modification, the first end teeth 21 bx are provided on the first drive gear unit 21.

  Alternatively, the tip of the teeth 31bx of the first end is larger than the tips of teeth other than the teeth 31bx of the first end among the plurality of teeth 31b of the gear portion 31 having the teeth 31bx of the first end. , Is located radially outward of a circle about the rotation axis Bx of the gear portion 31. By configuring the gear portions 21 and 31 having the first end teeth 21bx and 31bx in this manner, the sum of the radial distance Ltx and the radial distance Lsx is determined by the reference circle of the second drive gear portion 22. It can be equal to or greater than the sum of the diameter R22 and the reference circle diameter R32 of the second driven gear portion 32.

  In the first embodiment or the modified example, the first end teeth 31 bx are provided on the first driven gear unit 31.

  Further, in the first embodiment or the modified example, of the plurality of teeth 22b, 32b of the second driving gear portion 22 and the second driven gear portion 32, the shaft is used when shifting from the second meshing to the first meshing. Radial distance from the tip of the second end tooth 22by, 32by that passes last on the intermediate line L to the rotation axis Ax, Bx of the gear part 22, 32 having the second end tooth 22by, 32by. Lty and the gears having the main bodies 32a, 22a from the surfaces 32ay, 22ay of the main bodies 32a, 22a of the gears 32, 22 facing the tip of the second end teeth 22by, 32by on the axis L. The sum of the radial distance Lsy of the portions 32 and 22 to the rotation axes Bx and Ax is equal to or greater than the sum of the reference circle diameter R21 of the first drive gear portion 21 and the reference circle diameter R31 of the first driven gear portion 31. .

  According to such a drive mechanism 10, even if a dimensional error or an assembly error occurs in the drive mechanism 10, the distance between the drive gear 20 and the driven gear 30 at the assembly position is reduced, so that the second meshing is performed. When shifting to the first meshing, the teeth 21b of the first drive gear portion 21 and the teeth 31b of the first driven gear portion 31 can mesh without colliding with each other.

  For example, the surface 32ay of the main body portion 32a facing the tip of the second end tooth 22by is the second end tooth 22by of the plurality of teeth 22b of the gear portion 22 having the second end tooth 22by. It is located radially outward of a circle centered on the rotation axis Bx of the gear portion 32 than the surface 32as of the main body portion 32a of the gear portion 32 facing the tip of the other tooth on the interaxial line L. . By configuring the gear portion 32 that meshes with the gear portion 22 having the second end teeth 22by in this manner, the sum of the radial distance Lty and the radial distance Lsy can be set as a reference for the first drive gear portion 21. It can be equal to or greater than the sum of the circle diameter R21 and the reference circle diameter R31 of the first driven gear portion 31.

  Also, for example, the surface 32ay of the main body portion 32a facing the tip of the second end tooth 22by is formed on the outer peripheral edge 32ae of the main body portion 32a having the front surface 32ay on the gear portion 32 having the main body portion 32a. It is located radially outward of a circle centered on the rotation axis Bx from the point where the radial distance to the rotation axis Bx is the shortest. By configuring the gear portion 32 that meshes with the gear portion 22 having the second end teeth 22by in this way, the sum of the radial distance Lty and the radial distance Lsy can be reduced by the first drive gear portion 21. It can be equal to or greater than the sum of the reference circle diameter R21 and the reference circle diameter R31 of the first driven gear portion 31.

  In the first embodiment or the modified example, the second end teeth 22 by are provided on the second drive gear unit 22.

  Alternatively, the tip of the second end tooth 22by, 32by is the second end tooth 22by, 32b of the plurality of teeth 22b, 32b of the gear portion 22, 32 having the second end tooth 22by, 32by. The gears 22, 32 are located radially outside the circles around the rotation axes Ax, Bx of the gears 22, 32 with respect to the tip of the teeth other than 32 by. By configuring the gear portion 22 having the second end teeth 22by in this manner, the sum of the radial distance Lty and the radial distance Lsy can be determined by comparing the reference circular diameter R21 of the first drive gear portion 21 with the reference circular diameter R21. It can be greater than or equal to the sum of the reference circular diameter R31 of one driven gear portion 31.

  Further, in the first embodiment and the modification, the second end teeth 32 by are provided in the second driven gear portion 32.

<Second embodiment>
Next, the drive gear 20 and the upper driven gear 30 of the drive gear mechanism 10 according to the second embodiment will be described with reference to FIGS. FIG. 14 is a side view showing the drive gear 20 and the upper driven gear 30 of the drive gear mechanism 10 according to the second embodiment. 15 and 16 are partial enlarged views of the driving gear 20 and the upper driven gear 30 shown in FIG.

  In the example shown in FIGS. 14 to 16, the second drive gear portion has the first additional teeth and the first additional teeth as compared with the drive gear mechanism 10 shown in FIGS. 1 to 8C. And the surface of the main body of the gear portion facing the tip of the first additional tooth, the distance between the driving gear and the upper driven gear is changed by a second distance when transitioning from the first meshing to the second meshing. In that it is prevented from becoming smaller than the distance suitable for the engagement of the two. Also, the first driven gear portion has second additional teeth, and the second additional teeth and the surface of the main body portion of the gear portion facing the tip of the second additional teeth, The difference is that the transition from the second meshing to the first meshing prevents the distance between the drive gear and the upper driven gear from becoming smaller than the distance suitable for the first meshing. Other configurations are substantially the same as those of the air conditioner 1 shown in FIGS. 1 to 8C. In the examples shown in FIGS. 14 to 16, the same parts as those in the first embodiment shown in FIGS. 1 to 8C are denoted by the same reference numerals, and detailed description will be omitted.

  In the following, among the plurality of teeth 21b of the first drive gear unit 21 contributing to the first meshing, when the first meshing shifts from the first meshing to the second meshing, the tooth 21b finally passes on the axis L. The teeth 21 bp are also referred to as “third end teeth”. The teeth 21bp at the third end move along the axis L when shifting from the second meshing to the first meshing among the plurality of teeth 21b of the first drive gear portion 21 contributing to the first meshing. It is the first tooth to pass.

  Further, among the plurality of teeth 22b contributing to the second meshing of the second drive gear portion 22, when shifting from the first meshing to the second meshing, the teeth 22bq that first pass on the interaxial line L Is also referred to as a “fourth end tooth”. The fourth end tooth 22bq moves along the axis L when shifting from the second engagement to the first engagement among the plurality of teeth 22b that contribute to the second engagement of the second drive gear portion 22. It is the last tooth to pass.

  In the example shown in FIG. 14, the second drive gear unit 22 has a first additional tooth 22cr in addition to the plurality of teeth 22b. The first additional teeth 22cr are provided so as to pass on the interaxial line L prior to the fourth end teeth 22bq when transitioning from the first meshing to the second meshing. Specifically, when the first additional teeth 22cr shift from the first meshing to the second meshing, the teeth 21bp at the third end are replaced with any one of the plurality of teeth 31b of the first driven gear portion 31. It is provided so as to pass through the center line L before the fourth end tooth 22bq reaches the center line L after the contact is started.

  The radial distance Ltr from the tip of the first additional tooth 22cr to the rotation axis Ax of the gear portion 22 having the first additional tooth 22cr, and the tip and axis of the first additional tooth 22cr The sum of the radial distance Lsr from the surface 32ar of the main body portion 32a of the gear portion 32 facing the intermediary line L to the rotation axis Bx of the gear portion 32 having the main body portion 32a is the reference of the second drive gear portion 22. It is equal to or greater than the sum of the circle diameter R22 and the reference circle diameter R32 of the second driven gear portion 32.

  More specifically, the main body portion 32a of the gear portion 32 that meshes with the gear portion 22 having the first additional tooth 22cr is located at a position facing the tip of the first additional tooth 22cr. It has a protruding portion 32aw that protrudes radially outward of a circle centered on the rotation axis Bx. Due to the provision of the protruding portion 32aw, the surface 32ar of the main body portion 32a of the second driven gear portion 32 facing the tip of the first additional tooth 22cr is fixed to the surface of the main body portion 32a of the gear portion 32. 32as is located radially outside a circle centered on the rotation axis Bx.

  Even when the second driving gear portion 22 and the second driven gear portion 32 are configured as described above, the distance between the mounting positions of the driving gear 20 and the upper driven gear 30 is longer than the distance suitable for the second meshing. Even when the length is short, it is possible to prevent the drive gear 20 and the upper driven gear 30 from being too close to each other when performing the transition from the first meshing to the second meshing. You. That is, as shown in FIG. 15, according to the second drive gear unit 22 and the second driven gear unit 32, when the distance at the assembly position is shorter than the distance suitable for the second engagement, In transitioning from the first meshing to the second meshing, after the third end teeth 21bp mesh (contact) with the corresponding teeth 31b of the first driven gear portion 31, the first additional teeth 22cr are formed. Comes into contact with the surface 32ar of the main body portion 32a of the gear portion 32 that faces. As a result, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is the sum of the reference circle diameter R22 of the second drive gear section 22 and the reference circle diameter R32 of the second driven gear section 32. Is prevented from becoming smaller. That is, the distance between the drive gear 20 and the upper driven gear 30 is prevented from being shorter than the distance suitable for the second meshing. As a result, the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 can perform the second engagement without colliding with each other.

  Of course, the configuration of the second drive gear unit 22 and the second driven gear unit 32 is not limited to this. For example, the surface 32ar does not have to protrude outside the surface 32as of the main body portion 32a of the second driven gear portion 32. In this case, the first additional teeth 22cr extend outside the plurality of teeth 22b contributing to the second meshing of the second drive gear portion 22, and the tip of the first additional teeth 22cr is It suffices that it is located radially outward of a circle centered on the rotation axis Ax of the second drive gear unit 22 from the tip of the tooth 22b. With such a second drive gear portion 22 and a second driven gear portion 32 as well, the distance between the drive gear 20 and the upper driven gear 30 at the time of transition from the first meshing to the second meshing is set to the second meshing. It is prevented that the distance becomes smaller than the distance suitable for meshing.

  Further, the first additional teeth may be provided on the second driven gear portion 32. In this case, the surface of the second drive gear portion 22 that faces the first additional tooth on the center line L faces the tooth tip of the plurality of teeth 32b of the second driven gear portion 32 on the center line L. The second drive gear portion 22 only needs to be positioned radially outward of a circle centered on the rotation axis Ax of the second drive gear portion 22 from the surface 22as of the main body portion 22a of the second drive gear portion 22. Alternatively, the surface of the second drive gear portion 22 facing the first additional teeth on the center line L does not protrude outside the surface 22as of the main body portion 22a of the second drive gear portion 22, and It is only necessary that one additional tooth extends outside the plurality of teeth 32b contributing to the second meshing of the second driven gear portion 32. That is, it is only necessary that the tip of the first additional tooth is located radially outward of a circle centered on the rotation axis Bx of the second driven gear portion 32 from the tip of the plurality of teeth 32b. With such a second drive gear portion 22 and a second driven gear portion 32 as well, the distance between the drive gear 20 and the upper driven gear 30 at the time of transition from the first meshing to the second meshing is set to the second meshing. It is prevented that the distance becomes smaller than the distance suitable for meshing.

  Further, in the example shown in FIG. 14, the first driven gear portion 31 has second additional teeth 31cu in addition to the plurality of teeth 31b. The second additional teeth 31cu are provided so as to pass on the inter-axis line L before the third end teeth 21bp when transitioning from the second meshing to the first meshing. Specifically, the first additional teeth 22cr are in contact with the third end teeth 21bp after the fourth end teeth 22bq start contacting any of the plurality of teeth 31b of the first driven gear portion 31. Is provided so as to pass through the center line L before reaching the center line L.

  The radial distance Ltu from the tip of the second additional tooth 31cu to the rotation axis Bx of the gear unit 31 having the second additional tooth 31cu, and the tip and axis of the second additional tooth 31cu. The sum of the radial distance Lsu from the surface 21au of the main body 21a of the gear 21 facing the intermediary line L to the rotation axis Ax of the gear 21 having the main body 21a is a reference of the first drive gear 21. It is equal to or greater than the sum of the circle diameter R21 and the reference circle diameter R31 of the first driven gear portion 31.

  More specifically, the main body portion 21a of the gear portion 21 that meshes with the gear portion 31 having the second additional tooth 31cu is located at a position facing the tip of the second additional tooth 31cu. It has a protruding portion 21aw protruding radially outward of a circle centered on the rotation axis Ax. By providing the protruding portion 21aw, the surface 21au of the main body portion 21a of the first drive gear portion 21 facing the tip of the second additional tooth 31cu becomes the above-described surface of the main body portion 21a of the gear portion 21. 21as is located radially outward of a circle centered on the rotation axis Ax.

  Even when the first drive gear portion 21 and the first driven gear portion 31 are configured as described above, the distance between the drive gear 20 and the upper driven gear 30 at the assembly position is longer than the distance suitable for the first meshing. Even if it is short, when the transition from the second meshing to the first meshing, the distance between the drive gear 20 and the upper driven gear 30 is too close to be able to perform the first meshing. Is prevented. That is, as shown in FIG. 16, according to the first driving gear portion 21 and the first driven gear portion 31, when the distance between the above-described mounting positions is short, the transition from the second meshing to the first meshing is performed. Then, after the teeth 22bq at the fourth end have meshed (contacted) with the corresponding teeth of the second driven gear portion 32, the tip of the second additional tooth 31cu is brought into contact with the body of the gear portion 21 facing the second additional gear portion 31cu. It comes into contact with the surface 21au of the portion 21a. As a result, the distance between the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the upper driven gear 30 is the sum of the reference circle diameter R21 of the first drive gear section 21 and the reference circle diameter R31 of the first driven gear section 31. Is prevented from becoming smaller. That is, the distance between the driving gear 20 and the upper driven gear 30 is prevented from being shorter than the distance suitable for the first meshing. As a result, the teeth 21b of the first drive gear portion 21 and the teeth 31b of the second driven gear portion 31 can perform the first engagement without colliding with each other.

  Of course, the configuration of the first drive gear unit 21 and the first driven gear unit 31 is not limited to this. For example, the front surface 21au does not have to protrude outside the front surface 21as of the main body 21a of the first drive gear unit 21. In this case, the second additional teeth 31cu extend outward beyond the plurality of teeth 31b contributing to the first meshing of the first driven gear portion 31, and the tip of the second additional teeth 31cu has a plurality of tips. It is sufficient that the tooth 31b is located radially outward of a circle centered on the rotation axis Bx of the first driven gear portion 31 from the tip of the tooth 31b. With such a first drive gear portion 21 and a first driven gear portion 31 as well, the distance between the drive gear 20 and the upper driven gear 30 when the transition from the second meshing to the first meshing is made the first meshing. It is prevented that the distance becomes smaller than the distance suitable for meshing.

  Further, the second additional teeth may be provided on the first drive gear unit 21. In this case, the surface of the first driven gear portion 31 facing the second additional tooth on the center line L faces the tooth tip of the plurality of teeth 21b of the first drive gear portion 21 on the center line L. The first driven gear portion 31 only needs to be positioned radially outward of a circle centered on the rotation axis Bx of the first driven gear portion 31 from the surface 31as of the main body portion 31a of the first driven gear portion 31. Alternatively, the surface of the first driven gear portion 31 facing the second additional tooth on the center line L does not project outward from the surface 31as of the main body portion 31a of the first driven gear portion 31, It is only necessary that the two additional teeth extend outside the plurality of teeth 21b that contribute to the first meshing of the first drive gear portion 21. That is, the tip of the second additional tooth may be located radially outward of a circle centered on the rotation axis Ax of the first drive gear unit 21 from the tip of the plurality of teeth 21b. With such a first drive gear portion 21 and a first driven gear portion 31 as well, the distance between the drive gear 20 and the upper driven gear 30 when the transition from the second meshing to the first meshing is made the first meshing. It is prevented that the distance becomes smaller than the distance suitable for meshing.

  In the above-described second embodiment described above, the drive gear mechanism 10 flows through the air passage in the vehicle air conditioner 1 having the air conditioning case 2 forming the air passage 3 in which air flows. The doors 6, 8 for changing the air flow are driven. The drive gear mechanism 10 is connected to an actuator 11 that generates a rotational drive force, a drive gear 20 that is driven to rotate by the actuator 11, and a shaft 7 that drives the door. And a driven gear 30 for transmitting the rotation to the shaft 7. The drive gear 20 has a first drive gear portion 21 and a second drive gear portion 22 having different reference circle diameters R21 and R22. Further, the driven gear 30 includes a first driven gear portion 31 and a second driven gear portion having different reference circle diameters R31 and R32 provided corresponding to the first driving gear portion 21 and the second driving gear portion 22, respectively. 32. The engagement between the driving gear 20 and the driven gear 30 is determined by the first engagement between the first driving gear 21 and the first driven gear 31 or the second driving gear, depending on the rotation phase of the driving gear 20. This is achieved by the second engagement between the portion 22 and the second driven gear portion 32. The first drive gear portion 21 and the second drive gear portion 22 are respectively formed by main bodies 21a and 22a connected to the actuator 11 and a first driven gear 31 provided on the main bodies 21a and 22a. It has a plurality of teeth 21b and 22b that contribute to the first meshing or the second meshing with the second driven gear portion 32. The first driven gear portion 31 and the second driven gear portion 32 are respectively formed by main bodies 31a and 32a connected to the shaft 7 and a first driving gear portion 21 provided on the main bodies 31a and 32a. It has a plurality of teeth 31b and 32b that contribute to the first meshing or the second meshing with the second drive gear portion 22. The plurality of teeth 21b of the first drive gear unit 21 are connected to each other by an inter-axis line L connecting the rotation axis Ax of the drive gear 20 and the rotation axis Bx of the driven gear 30 when shifting from the first mesh to the second mesh. Above, it has a third end tooth 21 bp that passes last among the plurality of teeth 21 b of the first drive gear unit 21. When the plurality of teeth 22b of the second drive gear portion 22 shift from the first meshing to the second meshing, the plurality of teeth 22b of the second drive gear portion 22 first Has a fourth end tooth 22bq passing therethrough. The second drive gear portion 22 or the second driven gear portion 32 starts to contact the fourth end tooth 22bq after the third end tooth 21bp starts to contact any one of the plurality of teeth 31b of the first driven gear portion 31. Further has a first additional tooth 22cr that passes on the center line L before reaching the center line L. Radial distance Ltr from the tip of the first additional tooth 22cr to the rotation axis Ax of the gear portion 22 having the first additional tooth 22cr, and the tip of the first additional tooth 22cr and the centerline The sum of the distance Lsr in the radial direction from the surface 32ar of the main body portion 32a of the gear portion 32 facing on L to the rotation axis Bx of the gear portion 32 having the main body portion 32a is the reference circular diameter of the second drive gear portion 22. It is not less than the sum of R22 and the reference circular diameter R32 of the second driven gear portion 32.

  According to such a drive mechanism 10, even if a dimensional error or an assembly error occurs in the drive mechanism 10, the distance between the assembly positions of the drive gear 20 and the driven gear 30 is shortened. When shifting to the second meshing, the teeth 22b of the second drive gear portion 22 and the teeth 32b of the second driven gear portion 32 can mesh without colliding with each other.

  In the second embodiment, the first drive gear portion 21 or the first driven gear portion 31 starts the contact of the fourth end tooth 22bq with any one of the plurality of teeth 32b of the second driven gear portion 32. The second additional teeth 31cu that pass on the center axis L between the third end teeth 21bp and the third end teeth 21bp reach the center axis L. The radial distance Ltu from the tip of the second additional tooth 31cu to the rotation axis Bx of the gear unit 31 having the second additional tooth 31cu, and the tip and axis of the second additional tooth 31cu. The sum of the radial distance Lsu from the surface 21au of the main body 21a of the gear 21 facing the intermediary line L to the rotation axis Ax of the gear 21 having the main body 21a is a reference of the first drive gear 21. It is not less than the sum of the circle diameter R21 and the reference circle diameter R31 of the first driven gear portion 31.

  According to such a drive mechanism 10, even if a dimensional error or an assembly error occurs in the drive mechanism 10, the distance between the drive gear 20 and the driven gear 30 at the assembly position is reduced, so that the second meshing is performed. When shifting to the first meshing, the teeth 21b of the first drive gear portion 21 and the teeth 31b of the first driven gear portion 31 can mesh without colliding with each other.

  The vehicle air conditioner according to the present invention can be manufactured industrially and can be used for commercial transactions, so that it can be used industrially with economic value.

DESCRIPTION OF SYMBOLS 1 Air conditioner for vehicles 2 Air conditioning case 3 Air passage 3a Upper detour 3b Lower detour 5 Heating heat exchanger 6 Upper air mixing door 7 Upper shaft 8 Lower air mixing door 9 Lower shaft 10 Drive gear mechanism 11 Actuator 20 Drive gear 21 First drive gear unit 22 Second drive gear unit 30 Upper driven gear 31 First driven gear unit 32 Second driven gear unit 40 Rack 50 Lower driven gear 21bx, 31bx First end teeth 22by, 32by Second end tooth 21bp Third end tooth 22bq Fourth end tooth 22cr First additional tooth 31cu Second additional tooth Ax Drive gear rotation axis Bx Upper driven gear rotation axis Cx Lower Rotation axis of side driven gear S1 Virtual surface

Claims (14)

In a vehicle air conditioner (1) having an air conditioning case (2) forming an air passage (3) through which air flows, a door (6, 8) for changing a flow of air flowing through the air passage is provided. A driving gear mechanism (10) for driving,
An actuator (11) for generating a rotational driving force,
A drive gear (20) rotationally driven by the actuator (11);
A driven gear (30) that is connected to a shaft (7) that drives the door and that meshes with the drive gear (20) to transmit the rotational driving force of the actuator (11) to the shaft (7);
With
The drive gear (20) has a first drive gear portion (21) and a second drive gear portion (22) having different reference circle diameters (R21, R22) from each other,
The driven gears (30) are first driven gears having different reference circular diameters (R31, R32) provided corresponding to the first drive gear portion (21) and the second drive gear portion (22), respectively. A gear portion (31) and a second driven gear portion (32);
The mesh between the drive gear (20) and the driven gear (30) is such that the first drive gear part (21) and the first driven gear part (31) correspond to the rotational phase of the drive gear (20). Or the second engagement between the second drive gear portion (22) and the second driven gear portion (32), and
The first drive gear portion (21) and the second drive gear portion (22) are respectively connected to a main body (21a, 22a) connected to the actuator (11) and the main body (21a, 22a). A plurality of teeth (21b, 22b) provided for contributing to the first meshing with the first driven gear portion (31) or the second meshing with the second driven gear portion (32); Has,
The first driven gear portion (31) and the second driven gear portion (32) are respectively connected to a main body (31a, 32a) connected to the shaft (7) and the main body (31a, 32a). A plurality of teeth (31b, 32b) provided for contributing to the first meshing with the first driving gear portion (21) or the second meshing with the second driving gear portion (22); Has,
When the first drive gear portion (21) and the plurality of teeth (21b, 31b) of the first driven gear portion (31) shift from the first mesh to the second mesh, the drive is performed. The teeth (21bx, 31bx) of the first end that last pass on an axis (L) connecting the rotation axis (Ax) of the gear (20) and the rotation axis (Bx) of the driven gear (30). The radial distance (Ltx) from the tooth tip to the rotation axis (Ax, Bx) of the gear portion (21, 31) having the first end tooth (21bx, 31bx), and the first end tooth ( 21bx, 31bx) from the surface (31ax, 21ax) of the main body portion (31a, 21a) of the gear portion (31, 21) facing on the center line (L). Half of the gear portion (31, 21) having the rotation axis (Bx, Ax). The sum of the directional distance (Lsx) is equal to or greater than the sum of the reference circle diameter (R22) of the second drive gear portion (22) and the reference circle diameter (R32) of the second driven gear portion (32). Drive gear mechanism (10).   The surface (31ax, 21ax) of the main body (31a, 21a) facing the tip of the first end tooth (21bx, 31bx) has a gear having the first end tooth (21bx, 31bx). Of the plurality of teeth (21b, 31b) of the portion (21, 31), facing the tooth tip of a tooth other than the first end tooth (21bx, 31bx) on the interaxial line (L). Radially outward of a circle centered on the rotation axis (Bx, Ax) of the gear portion (31, 21) than the surface (31as, 21as) of the body portion (31a, 21a) of the gear portion (31, 21). The drive gear mechanism (10) according to claim 1, wherein the drive gear mechanism (10) is located at:   The surface (31ax, 21ax) of the main body (31a, 21a) facing the tip of the first end tooth (21bx, 31bx) is the main body (31a, 21ax) having the surface (31ax, 21ax). On the outer peripheral edge (31ae, 21ae) of (21a), the radial distance to the rotation axis (Bx, Ax) of the gear portion (31, 21) having the main body portion (31a, 21a) is smaller than that of the point. The drive gear mechanism (10) according to claim 1, wherein the drive gear mechanism (10) is located radially outward of a circle about the rotation axis (Bx, Ax).   The drive gear mechanism (10) according to claim 2 or 3, wherein the first end teeth (21bx) are provided on the first drive gear part (21).   The tip of the first end tooth (31bx) is the first end tooth of the plurality of teeth (31b) of the gear portion (31) having the first end tooth (31bx). The drive gear mechanism (10) according to claim 1, wherein the drive gear mechanism (10) is located at a position radially outside a circle centered on the rotation axis (Bx) of the gear portion (31) with respect to a tip of teeth other than (31bx). ).   The drive gear mechanism (10) according to claim 5, wherein the first end teeth (31bx) are provided on the first driven gear portion (31).   When shifting from the second meshing to the first meshing among the plurality of teeth (22b, 32b) of the second drive gear portion (22) and the second driven gear portion (32), the shaft gap is changed. The rotation axis (22, 32) of the gear portion (22, 32) having the second end tooth (22by, 32by) from the tip of the second end tooth (22by, 32by) that passes last on the line (L). Ax, Bx) in the radial direction (Lty) and the body of the gear portion (32, 22) facing the tip of the second end tooth (22by, 32by) on the center line (L). Sum of the radial distance (Lsy) from the surface (32ay, 22ay) of the part (32a, 22a) to the rotation axis (Bx, Ax) of the gear part (32, 22) having the main body part (32a, 22a). Is the same as the reference circle diameter (R21) of the first drive gear portion (21). The first is the driven gear portion (31) the reference circle diameter (R31) the sum of the above, the driving gear mechanism according to any one of claims 1 to 6 (10).   The surface (32ay) of the main body portion (32a) facing the tip of the second end tooth (22by) is provided on the plurality of gear portions (22) having the second end tooth (22by). The surface (32as) of the main body portion (32a) of the gear portion (32) facing the tip of the tooth other than the second end tooth (22by) among the teeth (22b) on the center line (L). The drive gear mechanism (10) according to claim 7, wherein the drive gear mechanism (10) is located radially outward of a circle centered on the rotation axis (Bx) of the gear portion (32).   The surface (32ay) of the main body (32a) facing the tip of the second end tooth (22by) is located on the outer peripheral edge (32ae) of the main body (32a) having the surface (32ay). The gear portion (32) having the main body portion (32a) is located radially outward of a circle centered on the rotation axis (Bx) from a point where the radial distance to the rotation axis (Bx) is shortest. The drive gear mechanism (10) according to claim 7, wherein   The drive gear mechanism (10) according to claim 8 or 9, wherein the second end teeth (22by) are provided on the second drive gear part (22).   The tip of the second end tooth (22by, 32by) is the tip of the plurality of teeth (22b, 32b) of the gear portion (22, 32) having the second end tooth (22by, 32by). It is located radially outside a circle centered on the rotation axis (Ax, Bx) of the gear portion (22, 32) from the tip of the teeth other than the second end tooth (22by, 32by). The drive gear mechanism (10) according to claim 7, wherein   The drive gear mechanism (10) according to claim 11, wherein the second end teeth (32by) are provided on the second driven gear part (32). In a vehicle air conditioner (1) having an air conditioning case (2) forming an air passage (3) through which air flows, a door (6, 8) for changing a flow of air flowing through the air passage is provided. A driving gear mechanism (10) for driving,
An actuator (11) for generating a rotational driving force,
A drive gear (20) rotationally driven by the actuator (11);
A driven gear (30) that is connected to a shaft (7) that drives the door and that meshes with the drive gear (20) to transmit the rotational driving force of the actuator (11) to the shaft (7);
With
The drive gear (20) has a first drive gear portion (21) and a second drive gear portion (22) having different reference circle diameters (R21, R22) from each other,
The driven gears (30) are first driven gears having different reference circular diameters (R31, R32) provided corresponding to the first drive gear portion (21) and the second drive gear portion (22), respectively. A gear portion (31) and a second driven gear portion (32);
The mesh between the drive gear (20) and the driven gear (30) is such that the first drive gear part (21) and the first driven gear part (31) correspond to the rotational phase of the drive gear (20). Or the second engagement between the second drive gear portion (22) and the second driven gear portion (32), and
The first drive gear portion (21) and the second drive gear portion (22) are respectively connected to a main body (21a, 22a) connected to the actuator (11) and the main body (21a, 22a). A plurality of teeth (21b, 22b) that contribute to the first meshing with the first driven gear portion (31) or the second meshing with the second driven gear portion (32). Have
The first driven gear portion (31) and the second driven gear portion (32) are respectively connected to a main body (31a, 32a) connected to the shaft (7) and the main body (31a, 32a). A plurality of teeth (31b, 32b) that contribute to the first meshing with the first driving gear portion (21) or the second meshing with the second driving gear portion (22). Have
The plurality of teeth (21b) of the first drive gear portion (21) are connected to the rotation shaft (Ax) of the drive gear (20) and the driven shaft when shifting from the first mesh to the second mesh. The third end of the third end that last passes among the plurality of teeth (21b) of the first drive gear unit (21) on the inter-axis line (L) connecting the rotation axis (Bx) of the gear (30). Have teeth (21 bp),
The plurality of teeth (22b) of the second drive gear portion (22) move from the first mesh to the second mesh on the center line (L). A fourth end tooth (22bq) passing first among the plurality of teeth (22b) of the part (22);
The second drive gear portion (22) or the second driven gear portion (32) may be configured such that the third end tooth (21 bp) has one of the plurality of teeth (31b) of the first driven gear portion (31). A first additional tooth passing on the center axis (L) between the start of contact with the heel and the fourth end tooth (22bq) reaching the center axis (L). (22cr),
A radial distance (Ltr) from a tip of the first additional tooth (22cr) to a rotation axis (Ax) of the gear portion (22) having the first additional tooth (22cr); From the surface (32ar) of the main body portion (32a) of the gear portion (32) facing the tip of the additional tooth (22cr) and the center line (L). 32) is the sum of the radial distance (Lsr) to the rotation axis (Bx) and the reference circle diameter (R22) of the second drive gear portion (22) and the reference circle of the second driven gear portion (32). A drive gear mechanism (10) that is not less than the sum of the diameter (R32). The first drive gear portion (21) or the first driven gear portion (31) may be configured such that the fourth end tooth (22bq) has one of the plurality of teeth (32b) of the second driven gear portion (32). A second additional tooth passing on the center axis (L) between the time when the third end tooth (21 bp) reaches the center axis (L) after the start of contact with the heel. (31 cu),
A radial distance (Ltu) from a tip of the second additional tooth (31cu) to a rotation axis (Bx) of the gear portion (31) having the second additional tooth (31cu); Of the gear portion (21a) of the gear portion (21) facing the tip of the additional tooth (31cu) on the inter-axis line (L) from the surface (21au) of the gear portion (21a). 21) is the sum of the radial distance (Lsu) to the rotation axis (Ax) and the reference circle diameter (R21) of the first drive gear portion (21) and the reference circle of the first driven gear portion (31). The drive gear mechanism (10) according to claim 13, which is equal to or greater than the sum of the diameter (R31).