US 9,810,306 B2Granted

Differential device

AssigneeMusashi Seimitsu Industry Co., Ltd.

InventorsNaoya Nishimura, Hiroyuki Mori

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Abstract

In a differential device, paired side gears include shaft portions and intermediate wall portions formed in a flat plate shape intersecting an axis of the output shafts, the intermediate wall portions integrally connecting the shaft portions to toothing portions of the side gears separated outward from the shaft portions in a radial direction of an input member, respectively. Each of the intermediate wall portions is formed with a width in the radial direction which is longer than a maximum diameter of a pinion. A cover portion includes a boss portion and a side wall portion connected to the boss portion and having an outer side surface as a surface orthogonal to the axis of the output shafts. A back surface of at least one of the intermediate wall portion and the toothing portion is supported on an inner side surface of the side wall portion.

Claims13

Dependent claims

A differential device which distributively transmits rotational force of an input member to a pair of output shafts, the input member retaining a pinion support portion that supports a pinion and being rotatable together with the pinion support portion, the differential device comprising:

a pair of side gears each having an annular toothing portion in mesh with the pinion in an outer peripheral portion and connected to the pair of output shafts, respectively;
and
a cover portion axially covering an outside of at least one side gear of the side gears and rotating integrally with the input member, wherein
the pair of side gears include
shaft portions connected to the pair of output shafts, respectively, and
intermediate wall portions formed in a flat plate shape intersecting an axis of the output shafts, the intermediate wall portions integrally connecting the shaft portions to the annular toothing portions separated outward from the shaft portions in a radial direction of the input member, respectively,
each intermediate wall portion is formed with a width in the radial direction which is greater than a maximum diameter of the pinion,
the cover portion includes
a boss portion concentrically surrounding the corresponding shaft portion, and
a plate-shaped side wall portion connected to the boss portion and having an outer side surface as a surface orthogonal to the axis of the output shafts,
wherein:
a back surface of at least one of the intermediate wall portions and the annular toothing portion of the side gear is rotatably supported on an inner side surface of a corresponding one of the side wall portions of the cover portion,
the input member includes an input toothing portion having a plurality of teeth extending in a direction substantially parallel to an axial direction of the output shafts, the input toothing portion configured to receive rotational force from a power source in an outer peripheral portion of the input member, and
the side wall portion of the cover portion is disposed within a width of the input toothing portion in the axial direction of the output shafts.

11 more elements

A differential device comprising:

an input member into which driving force is input;
a differential gear support portion supported in the input member;
a differential gear supported on the differential gear support portion;
a pair of output gears in mesh with the differential gear and relatively rotatable to the differential gear;
and
a cover portion axially covering an outside of at least one output gear of the output gears and rotating integrally with the input member,
wherein:
each of the output gears includes
a shaft portion connected to a corresponding one of a pair of output shafts, and
a toothing portion in mesh with the differential gear,
the cover portion includes
a boss portion surrounding the shaft portion of the associated output gear, and
a side wall portion connected to the boss portion,
the input member has an input toothing portion having a plurality of teeth extending in a direction substantially parallel to an axial direction of the output shafts, the input toothing portion configured to receive the drive force in an outer peripheral portion of the input member, and
the side wall portion of the cover portion is disposed within a width of the input toothing portion in the axial direction of the output shafts,
and further wherein
d
⁢
⁢
2
/
PCD
≦
3.36
·
(
1
Z
⁢
⁢
1
)
2
3
·
sin
⁡
(
tan
-
1
⁢
Z
⁢
⁢
1
Z
⁢
⁢
2
)
is satisfied, and Z1/Z2>2 is satisfied, where Z1, Z2, d2 and PCD denote the number of teeth of each of the output gears, the number of teeth of the differential gear, a diameter of the differential gear support portion and a pitch cone distance, respectively.

49 more elements

Dependencies are inferred from the claim text.