Driving force transmission mechanism

Abstract

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.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2009-220733 filed on Sep. 25, 2009, of which the contents are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a driving force transmission mechanism for transmitting and outputting an output force of a driving section via a drive gear and a driven gear.[0004]2. Description of the Related Art[0005]Heretofore, in a vehicular air conditioning apparatus, which is mounted in a passenger vehicle, cool air that is cooled by an evaporator serving as a cooling means and warm air that is heated by a heater core serving as a heating means are mixed together in a housing thereof by adjusting a degree of opening of an air mixing damper, and such mixed air is blown out selectively by opening and closing outlet doors, which are provided with respect to outlet ports dispose...

AI Technical Summary

Benefits of technology

[0009]A general object of the present invention is to provide a driving force transmission mechanism, in which positioning of a drive gear and a driven gear can easily be carried out when the drive gear and the driven gear are assembled together. Additionally, the driving force transmission mechanism also enables transmission of a driving force from the drive gear to the driven gear to be performed reliably and effectively.

[0010]The present invention is characterized by a driving force transmission mechanism 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, and a meshing member disposed at an interior of the positioning member for causing the drive gear and the driven gear to enmesh mutually.

[0012]Accordingly, when the drive gear and the driven gear are assembled, since relative positioning thereof in the direction of rotation can easily be performed by the positioning member, which is disposed on the outer circumferential regions of the drive gear and the driven gear, ease of assembly of the driving force transmission mechanism can be enhanced. Together therewith, since with the positioning member, meshing of the drive gear and the driven gear can be brought about by the meshing member, even at the positioning member, the driving force from the drive gear can be transmitted reliably and effectively to the driven gear via the meshing member.

Problems solved by technology

However, with the driving force transmission mechanism according to the prior art, in the case that a clearance is set such that an enmeshed state between the plurality of teeth provided on the small gear of the output gear, the tooth thickness of which is small, and the teeth provided on the second transmission gear, i.e., a mutually enmeshed state (hooked state) between the teeth, is made appropriate, meshing (hooking) between the fat tooth of the output gear and the second transmission gear becomes insufficient, and proper transmission of the driving force cannot be realized.

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