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A driving force transmission mechanism is equipped with a first gear attached to a drive source, a second gear enmeshed with the first gear, and a damper shaft enmeshed mutually with the second gear and with a rack member of an air mixing damper. A first locator part formed on the second gear is ins

A driving force transmission mechanism is equipped with a first gear attached to a drive source, a second gear enmeshed with the first gear, and a damper shaft enmeshed mutually with the second gear and with a rack member of an air mixing damper. A first locator part formed on the second gear is inserted in a first locator groove in the first gear, while additionally, a second locator part is inserted with respect to a second locator groove in a damper gear. Further, a first narrow tooth formed on the first gear enmeshes with a meshing groove of the first locator part, whereas a second narrow tooth formed on the damper gear enmeshes with another meshing groove of the second locator part.

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1. A driving force transmission mechanism having a plurality of gears, for transmitting a driving force from a driving section, comprising: a drive gear connected to the driving section and having a plurality of first gear teeth on an outer circumferential region thereof;a driven gear having a plura

1. A driving force transmission mechanism having a plurality of gears, for transmitting a driving force from a driving section, comprising: a drive gear connected to the driving section and having a plurality of first gear teeth on an outer circumferential region thereof;a driven gear having a plurality of second gear teeth on an outer circumferential region thereof, which are enmeshed with the first gear teeth, the driven gear being enmeshed with the drive gear;a positioning member provided on the outer circumferential regions of the drive gear and the driven gear, the positioning member being adjacent to the first gear teeth or the second gear teeth, for performing positioning of the drive gear and the driven gear in a direction of rotation thereof; anda meshing member disposed on an interior of the positioning member for causing the drive gear and the driven gear to enmesh mutually,wherein the positioning member further comprises: a groove disposed on one of the drive gear and the driven gear, the groove being formed by leaving out one end of one of the first gear teeth and the second gear teeth in a rotation axis direction of one of the drive gear and the driven gear so as to have a diameter smaller than a teeth end diameter of the one of the first gear teeth and the second gear teeth; andan engagement member formed on another of the drive gear and the driven gear that does not have the groove, the engagement member being configured to be inserted into the groove,wherein the meshing member further comprises: one intermediate meshing tooth disposed on one of the drive gear and the driven gear, the meshing tooth being formed with the same diameter as a teeth end diameter of the first gear teeth or the second gear teeth and with a width narrower than a width of the first gear teeth or the second gear teeth; anda meshing groove formed on another of the drive gear and the driven gear that does not have the meshing tooth, the meshing groove being configured to be enmeshed with the meshing tooth, the meshing groove being formed only between a pair of adjacent teeth and being sized to position only the intermediate meshing tooth therebetween, the intermediate meshing tooth being shorter in the width direction than the adjacent teeth in the rotation axis direction of the one of the drive gear and the driven gear,wherein the engagement member is constituted from an adjacent pair of the first gear teeth or the second gear teeth, and a wall portion that adjoins the pair of the first gear teeth or the second gear teeth, the meshing groove being disposed in an interior region surrounded only by the pair of the adjacent first gear teeth or the second gear teeth and the wall portion,wherein the engagement member is formed such that the wall portion protrudes outward from an end of the pair of the first gear teeth or the second gear teeth in a width direction on the another of the drive gear and the driven gear that has the engagement member,wherein the engagement member has a U-shape formed only by the pair of the first gear teeth or the second gear teeth and the wall portion when viewed from a radial direction, andwherein the meshing tooth enmeshes with the meshing groove, in a state where the engagement member is inserted into the groove for performing positioning, and the wall portion enmeshes with the groove, andwherein the meshing groove of the engagement member meshes with the groove and the meshing tooth so as to position the drive gear relative to the driven gear in a first position, prior to rotation of the respective gears. 2. The driving force transmission mechanism according to claim 1, wherein the groove is formed between the adjacent pair of the first gear teeth or the second gear teeth, and the meshing tooth is disposed between one of the first gear teeth or the second gear teeth and another of the first gear teeth or the second gear teeth. 3. The driving force transmission mechanism according to claim 1, wherein the driving force transmission mechanism is used in a vehicular air conditioning apparatus for adjusting air introduced from an exterior or interior of a vehicle to a predetermined temperature and supplying the air to the interior of the vehicle, and wherein a driving force of the driving section is transmitted to a switching damper disposed inside a casing via the drive gear and the driven gear.