Vehicle transfer structure

Patent metadata

Field	Value
Publication number	US-10513176-B2
Application number	US-201815866747-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Mar 10, 2017
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A vehicle transfer structure includes a main-drive-wheel output shaft that receives torque from a drive source and outputs it to main drive wheels, a part-time-drive-wheel output shaft provided parallel to the main-drive-wheel output shaft, a coupling provided on the main-drive-wheel output shaft and which partially extracts the torque to the part-time-drive-wheel output shaft via a transmission mechanism, and a damper disposed on the main-drive-wheel output shaft. The coupling is provided with an input-side coupling part coupled to an inner circumferential part of the damper. The input-side coupling part is coupled, via a spline-fitted section, to an output-side coupling part of a drive force transmission member which is coupled to an outer circumferential part of the damper and transmits a drive force to a driving-side transmission member of the transmission mechanism. The spline-fitted section allows a relative rotation between the input- and output-side coupling parts within a given angle.

First claim

What is claimed is:

1. A vehicle transfer structure, comprising:
a main-drive-wheel output shaft configured to receive torque from a drive source and output the torque to main drive wheels;
a part-time-drive-wheel output shaft provided in parallel to the main-drive-wheel output shaft;
a coupling provided on the main-drive-wheel output shaft and configured to extract a portion of the torque and output it to the part-time-drive-wheel output shaft via a transmission mechanism; and
a damper disposed on the main-drive-wheel output shaft between the coupling and the transmission mechanism, wherein
the coupling is provided with an input-side coupling part having a cylindrical shape, extending toward the transmission mechanism, and coupled to an inner circumferential part of the damper via a first spline-fitted section,
the input-side coupling part of the coupling is coupled, via a second spline-fitted section, to an output-side coupling part of a drive force transmission member coupled to an outer circumferential part of the damper and configured to transmit a drive force to a driving-side transmission member of the transmission mechanism, the output-side coupling part having a cylindrical shape and extending toward the coupling, the second spline-fitted section allowing a relative rotation between the input-side coupling part and the output-side coupling part within a given angle, and
the first and second spline-fitted sections are provided on an inner circumferential side of the damper, adjacently to each other in an axial direction of the main-drive-wheel output shaft.

2. The transfer structure of claim 1 , wherein
the drive force transmission member has a cylindrical part extending toward the transmission mechanism,
a tip end portion of the cylindrical part is coupled to a cylindrical extension part provided to the driving-side transmission member of the transmission mechanism and extending toward the coupling, and
a seal member attached to a transfer case is disposed at a root end side of the cylindrical part.

3. The transfer structure of claim 1 , wherein the drive force transmission member is coupled to the outer circumferential part of the damper by using a bolt.

4. The transfer structure of claim 3 , wherein
an inner cylindrical member constituting the inner circumferential part of the damper is formed with an inner-cylindrical-side protrusion protruding outwardly,
an outer cylindrical member constituting the outer circumferential part of the damper is formed with an outer-cylindrical-side protrusion protruding inwardly,
an elastic member is sandwiched between the inner-cylindrical-side protrusion and the outer-cylindrical-side protrusion, and
the outer-cylindrical-side protrusion is provided with a fastening section for the bolt that couples the outer circumferential part of the damper to the drive force transmission member.

5. The transfer structure of claim 1 , wherein a seal member is provided between the first and second spline-fitted sections and the inner circumferential part of the damper to prevent entrance of lubrication oil from the first and second spline-fitted sections into the damper side.

Assignees

• Mazda Motor

Inventors

• Ohkawa Yuzo
• Mito Eiji

Classifications

• F16D13/52 Primary

  Clutches with multiple lamellae {; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member (F16D13/385 takes precedence)} · CPC title

• F16D7/00

  Slip couplings, e.g. slipping on overload, for absorbing shock (combined with yielding shaft couplings F16D3/14; fluid slip couplings F16D31/00 - F16D35/00) · CPC title

• F16F15/1245

  Elastic elements arranged between substantially-radial walls of two parts rotatable with respect to each other, e.g. between engaging teeth · CPC title

• B60K17/351

  comprising a viscous clutch · CPC title

• F16D2300/22

  Vibration damping · CPC title