Differential device

Patent metadata

Field	Value
Publication number	US-10006532-B2
Application number	US-201514918028-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Oct 22, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

In a differential device, side gears include: shaft portions; and intermediate wall portions each formed in a flat ring plate shape orthogonal to an axis of output shafts and integrally connecting between the shaft portions and toothing portions separated outward from the shaft portions in a radial direction of an input member, respectively. At least part of each intermediate wall portion is formed as a thin portion having an outside surface retreating axially inward from a backside of the tooting portion. A side wall portion of a cover portion integrally includes an outer-periphery-side side wall portion having an inside surface facing the backside of the toothing portion, and an inner-periphery-side side wall portion having an inside surface facing a backside of the intermediate wall portion. At least part of the inner-periphery-side side wall portion is formed thicker than the outer-periphery-side side wall portion and protrudes toward the thin portion.

First claim

What is claimed is:

1. A differential device comprising
an input member into which rotational 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 meshing with the differential gear and connected to a pair of output shafts, respectively, and
a cover portion covering an axially output-side surface of at least one output gear of the output gears and rotating integrally with the input member,
wherein:
the at least one output gear includes:
a shaft portion connected to one output shaft corresponding to the one output gear,
a toothing portion meshing with the differential gear separated outward from the shaft portion in a radial direction of the input member, and
an intermediate wall portion integrally connecting between the shaft portion and the toothing portion, the intermediate wall portion including a retreating portion having an outer side surface retreating inwardly, in an axial direction of the output shafts, from an axially output-side surface of the toothing portion,

the cover portion includes a side wall portion rotatably supporting the axially output-side surface of the at least one output gear,
the side wall portion includes
an outer periphery-side side wall portion having an inner side surface facing the axially output-side surface of the toothing portion and
an inner periphery-side side wall portion having an inner side surface facing an axially output-side surface of the intermediate wall portion, and

at least part of the inner periphery-side side wall portion protrudes toward the retreating portion from the outer periphery-side side wall portion in the axial direction of the output shafts, and

d
⁢

⁢

2
/
PCD

≦

3.36
·

(

1

z
⁢

⁢
1

)

2
3

·

sin
⁡

(

tan

-
1

⁢

z
⁢

⁢
1

z
⁢

⁢
2

)

is satisfied, and
Z 1 /Z 2 >2 is satisfied, where Z 1 , Z 2 , d 2 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.

2. The differential device according to claim 1 , wherein Z 1 /Z 2 ≥4 is satisfied.

3. The differential device according to claim 1 , wherein Z 1 /Z 2 ≥5.8 is satisfied.

4. The differential device according to claim 1 , wherein
a washer is interposed between opposing surfaces of the axially output side surface of the output gear and an inner side surface of the cover portion, the washer relatively rotatably connecting between the axially output side surface of the output gear and the inner side surface of the cover portion, and
a washer retaining groove retaining the washer is formed in at least one of the axially output side surface of the output gear and the inner side surface of the cover portion.

5. The differential device according to claim 4 , wherein the washer retaining groove is formed in the axially output side surface of the at least one output gear at the retreating portion.

6. The differential device according to claim 4 , wherein of the differential gear support portion, an intermediate shaft portion facing the retreating portions of the output gears is formed with a diameter smaller than that of another shaft portion.

7. The differential device according to claim 1 , wherein of the differential gear support portion, an intermediate shaft portion, facing the retreating portions of the output gears, is formed with a diameter smaller than that of another shaft portion.

8. The differential device according to claim 5 , wherein of the differential gear support portion, an intermediate shaft portion facing the retreating portions of the output gears is formed with a diameter smaller than that of another shaft portion.

9. A differential device comprising
an input member into which rotational force is input,
a differential gear support portion supported in the input member,
a differential gear supported on the differential gear support portion, and
a pair of output gears meshing with the differential gear and capable of rotating relative to each other, and

d
⁢

⁢

2
/
PCD

≦

3.36
·

(

1

Z
⁢

⁢
1

)

2
3

·
sin

⁢

⁢

(

tan

-
1

⁢

Z
⁢

⁢
1

Z
⁢

Assignees

• Musashi Seimitsu Kogyo Kk

Inventors

• Mori Hiroyuki
• Nishimura Naoya

Classifications

• F16H2048/385

  of the ring or crown gear · CPC title

• F16H48/08 Primary

  comprising bevel gears · CPC title

• F16H2048/387

  Shields or washers · CPC title

• F16H2048/405

  characterised by features of the bearing of the rotating case · CPC title

• F16H48/40

  characterised by features of the rotating cases · CPC title