JP3323342B2 - Differential device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential device for a vehicle.

[0002]

2. Description of the Related Art As shown in FIG . 10 , a side gear 5 provided in a differential case 3 of a differential device is provided.
The differential pinions 6a and 6b that mesh with the differential pins a and 5b are rotatably mounted on a pinion shaft 7 inserted into a pinion shaft hole 8 formed in the differential case 3 through the differential pinions 6a and 6b.

The pinion shaft 7 fitted in the pinion shaft hole 8 needs to be prevented from coming off in the axial direction and from rotating. The structure is such that a pin hole 21 is radially penetrated through one end of the pinion shaft 7. A pin hole 20 is provided in the differential case 3 at a position corresponding to the pin hole 21 in the same axial direction as the pin hole 21 so as to pass through the pin hole 21 of the pinion shaft 7 and the pin hole 21 of the differential case 3. The structure in which the pin 22 is inserted is common as disclosed in Japanese Utility Model Laid-Open No. 56-13020 or Japanese Utility Model Laid-Open No. 62-103731.

[0004]

In the above-described structure for preventing the pinion shaft 7 from coming off and preventing the pinion shaft from rotating, the pinion shaft 21 is formed with a pin hole 21 at one end thereof, and the pin hole of the differential case 3 is formed. 20 is necessary, and in particular, the pin hole 20 of the differential case 3 is a long hole having a small diameter, and the drill for drilling the pin hole is a long and thin drill. When a drill breaks in a hole during installation, it is very difficult to remove the drill biting into the hole.

The pinion shaft 7 is assembled to the differential case 3 in such a manner that the pin holes 21 at one end of the pinion shaft 7 are fitted in phase with the pin holes 20 of the differential case 3 and the pins 22 are fitted. The work was not easy.

An object of the present invention is to make it possible to prevent the pinion shaft from coming off in the axial direction and to prevent it from rotating by a simple structure,
An object of the present invention is to provide a differential device that facilitates an assembling operation.

[0007]

The gist of the present invention for attaining the above object is as follows.
Pinion with gear-gearing in differential case
Detach the ring gear close to the shaft hole with a slight gap
To the case and penetrate the differential pinion in the differential case.
The pinion shaft is rotatably fitted into the pinion shaft hole.
The both end faces of the pinion shaft are
Means to prevent slipping in the axial direction by interfering with
At one end of the shaft in a direction perpendicular to the axis of the pinion shaft.
An extended flat tongue is formed, and the flat tongue is
And a detent means provided with a flattening part in contact with
It is characterized by the following.

According to a second aspect of the present invention , a differential case is provided.
Pinion that rotatably supports through the differential pinion inside
Pinion shaft with open shaft in differential case
Insert the pinion shaft into one end of the pinion shaft.
An eccentric projection shaft that is eccentric with the shaft axis of the shaft
An eccentric hole for fitting the eccentric projection shaft to the
The other end engages the differential case to prevent it from slipping off in the axial direction.
A snap ring is fitted.
You.

[0009]

According to the present invention , the pinion shaft and the differential case can be attached to the differential case in the axial direction to prevent the pinion shaft from coming off and to prevent the rotation of the pinion shaft without providing a pin hole in the pinion shaft and the differential case.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a differential carrier, and 2 denotes a drive shaft rotatably mounted on the differential carrier 1 via bearings. It is connected to the shaft. This drive shaft 2 has a drive pinion 2a
Are formed.

1 and 2, reference numeral 3 denotes a differential case which is rotatably supported by the differential carrier 1. A ring gear 4 is fixed to the outside of the differential case 3 and meshes with the drive pinion 2a.

A pair of left and right side gears 5a, 5b and a pair of front and rear differential pinions 6a, 6b meshing with the side gears 5a, 5b are provided in the differential case 3. The side gears 5a and 5b are rotatably supported by the differential case 3, and the differential pinions 6a and 6b are rotatably supported by a pinion shaft 7.

Therefore, the pinion shaft 7 is fitted into a pinion shaft hole 8 formed in the differential case 3 so that both end surfaces of the pinion shaft 7 interfere with the spigot 10 of the ring gear 4 to prevent the pinion shaft 7 from coming off in the axial direction. That is, as shown in FIGS. 1 and 2, the spigot 10 of the ring gear 4 is
A slight gap in the pinion shaft hole 8 opened in 3
The ring gear 4 is fixed to the differential case 3 in close proximity with
The both end faces of the nonion shaft 7 are the
With a configuration that prevents it from coming off in the axial direction by interfering with
is there.

As shown in FIGS. 3 and 4, a flat tongue 7a is formed at one end of the pinion shaft 7 and extends in a direction perpendicular to the axis of the pinion shaft 7. There is provided a flattening portion 9 which comes into contact with 7a to prevent rotation.

In the first embodiment having the above-described structure, the pinion shaft 7 inserted into the pinion shaft hole 8 formed in the differential case 3 is disengaged in the axial direction because both end surfaces of the pinion shaft 7 interfere with the spigot 10 of the ring gear 4. The flat tongue portion 7a at one end of the pinion shaft 7 comes into contact with the flattening portion 9 of the differential case 3 and is stopped from rotating, so that the differential pinions 6a, 6
b is rotatably supported.

FIG . 6 shows a second embodiment of the present invention. The first of this 2
In the embodiment, as shown in FIGS.
Offset from the axis 0 of the pinion shaft 7 on one end face of the shaft 7.
Forming an eccentric projection shaft 7b centered on the centered position 01,
From the axis 0 of the pinion shaft 7 to the differential case 3
An eccentric hole centered on the eccentric position 01 is provided,
The eccentric projection shaft 7b is fitted and stopped.

Further , an annular groove 14 is provided in the inner periphery of the pinion shaft hole 8 at the other end of the pinion shaft 7, and a snap ring 12 is fitted into the annular groove 14, and the other end surface of the pinion shaft 7 is engaged with the snap ring 12. In this configuration, it is prevented from coming off in the axial direction.

As described above, in each of the first and second embodiments , the pinion shaft 7 and the differential case 3 are not provided with the pin holes for preventing the pinion shaft 7 from coming off in the axial direction and preventing the rotation of the pinion shaft 7 from rotating. In the third embodiment, the pinion shaft 7 is prevented from coming off in the axial direction and is prevented from rotating.

[0022]

[Effect of the Invention] As described above, according to the present invention, wherein
In the configuration of Item 1, the pinion shaft assembled to the differential case interferes with the spigot of the ring gear and is pulled out in the axial direction.
Only it is stopped, and is prevented from rotating in a flat-up portion provided on a plane tongues extend in a direction and the differential case perpendicular to the axis of the pinion shaft to one end of the pinion shaft, according to claim 2 structure
In this configuration, the eccentric projection shaft formed on one end surface of the pinion shaft and the eccentric hole provided in the differential case prevent rotation, and a snap ring prevents axial removal .
As described above, both the machining and the assembling work are facilitated without providing pin holes in the pinion shaft and the differential case as in the related art, thereby improving productivity and reducing costs. .

[Brief description of the drawings]

FIG. 1 is a sectional view of the overall configuration of a first embodiment of the apparatus of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the first embodiment of the device of the present invention.

FIG. 3 is an end view of a main part of the first embodiment of the apparatus of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is an enlarged sectional view of a main part of a second embodiment of the present invention.

FIG. 7 is an end view of a main part of a second embodiment of the apparatus of the present invention.

8 is a sectional view taken along line EE of FIG . 7;

9 is a sectional view taken along line FF of FIG . 7;

FIG. 10 is a sectional view of a main part of a conventional device.

[Explanation of symbols]

 Reference Signs List 1 differential carrier 2 drive shaft 2a drive pinion 3 differential case 4 ring gear 5a side gear 5b side gear 6a differential pinion 6b differential pinion 7 pinion shaft 7a flat tongue 7b eccentric protruding shaft 8 pinion shaft hole 9 flat portion 10 ring gear snap ring 12

Continuation of the front page (56) References Japanese Utility Model Showa 49-75503 (JP, U) Japanese Utility Model Showa 49-134004 (JP, U) Japanese Utility Model Showa 50-22902 (JP, U) Japanese Utility Model Showa 50-31043 (JP) , U) Fully open 1979-33344 (JP, U) Fully open sho 59-6654 (JP, U) Fully open 1986-99753 (JP, U) Fully open 1986-191548 (JP, U) 4-56951 (JP, U) JP 5-3699 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 48/08 F16B 21/00

Claims (2)

(57) [Claims] 1. A ring gear spigot is opened in a differential case.
Close to the pinion shaft hole
Attach the ring gear to the differential case, and
Said pinion shaft rotatably bearing through a pinion
Both end surfaces of the pinion shaft inserted into the shaft hole are
A hand that prevents it from coming off in the axial direction by interfering with the ring gear spigot
Step and pinion shaft axis at one end of pinion shaft
Form a flat tongue extending in a direction perpendicular to the line,
Non-rotational stop provided with a flattened portion in contact with the flat tongue portion on the base
Differential device being characterized in that a fit means. 2. Through a differential pinion in a differential case.
Open the rotatable pinion shaft in the differential case
Into the pinion shaft hole
The eccentricity of the pinion shaft on one end face
A projection shaft is formed, and the eccentric projection shaft is fitted to the differential case.
Eccentric hole to prevent rotation, and the other end
Snap ring fitted to prevent axial removal
A differential device, characterized in that: