JP2604564Y2 - Planetary gear set - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear set suitable for use in an automatic transmission of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a planetary gear device of this type,
For example, the one described in Japanese Utility Model Laid-Open No. 61-157750 is known.

In this device, a pinion shaft fixed to a carrier rotatably supports a pinion gear (planetary gear) that meshes with a sun gear (sun gear) and an internal gear (internal gear) via a needle bearing. Then, between the carrier and the pinion gear, two outer and inner thrust washers are respectively rotatably stacked and interposed.

[0004]

However, in the above-mentioned conventional apparatus, for example, the gap between the carrier and the outer thrust washer in contact with the carrier, and the gap between the outer thrust washer and the inner thrust washer in contact with the pinion gear, for example. When they are in close contact with each other, relative rotation occurs between the inner thrust washer and the pinion gear, and between the inner thrust washer and the needle bearing, and the respective sliding contact surfaces may be intensively worn. . Further, since the inner thrust washer is allowed to rotate freely, there is a possibility that the inner peripheral surface of the thrust washer may be unevenly worn due to uneven sliding contact with the pinion shaft.
Generally, the outer washer is made of a slippery bearing material such as copper, while the inner washer is made of steel to receive the end surface of the needle bearing. Therefore, in particular, there is a possibility that the sliding contact surface of the washer inside is greatly worn.

An object of the present invention is to prevent wear of a washer interposed between a carrier and a planetary gear and a sliding contact surface between the planetary gear and prevent uneven wear of an inner peripheral surface of the washer. It is an object of the present invention to provide a planetary gear device that can perform the following.

[0006]

The planetary gear device according to the present invention has a planetary gear rotatably supported by a shaft fixed to a carrier via a needle bearing, and is provided between the carrier and the planetary gear. In a planetary gear device in which a thrust washer that fits into the shaft is interposed,
A plurality of thrust washers are rotatably interposed between the carrier and the planetary gears, and an inner one of the plurality of thrust washers that is in contact with the planetary gears is prevented from rotating around the planetary gears. When done
The inner diameter is larger than other thrust washers and
Its inner circumference is smaller than the center line of the needle bearing.
Between the inner peripheral portion and the shaft.
And a passage for lubricating oil is formed .

[0007]

[Effect] The planetary gear device of the present invention comprises a carrier and a planetary gear.
And a plurality of thrust washers that are rotatably interposed between
Of the washers, the inner thrust washer that contacts the planetary gear
With respect to the planetary gear,
Larger than the thrust washer of
Radially inward from the centerline of the needle bearing.
As a result, the inner circumference of the thrust washer inside
Through the lubricant passage formed between the shaft and
Lubricating oil in the bearing
Lubricate the lubricating oil sufficiently between the thrust washers. Further
In order to form a passage for the lubricating oil,
The inner thrust washer on the planetary gear
Therefore, the inner peripheral surface of the thrust washer and the outer periphery of the shaft
Avoid uneven wear due to uneven sliding contact with the surface
The distance between them is always constant.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a carrier formed by joining first and second disc-shaped carrier members 11 and 12, and a boss 11A of the first carrier member 11 is spline-fitted to the rotating shaft 1. ing. A sun gear (sun gear) 2 and an internal gear (internal gear) 3 are located on the outer peripheral portion of the rotating shaft 1 so as to be rotatable around the axis O ₁ of the rotating shaft 1.

[0010] In the carrier 10, 90 along the circumferential direction.
The carrier member 1 is located at each of the four
A pinion shaft 13 penetrating through 1 and 12 is fixed. The pinion shaft 13 has a needle bearing 14
, A pinion gear (planetary gear) 4 is rotatably supported. Both ends of the pinion gear 4 and the carrier 1
Each between 0 and 2 has two thrust washers 3
1, 32 are interposed. These washers 31,3
2 will also be interposed between the needle bearing 14 and the carrier 10.

The inner thrust washer 31 in contact with the pinion gear 4 and the needle bearing 14 is made of steel, and has a claw 31A which is bent in a direction facing the pinion gear 4. The plurality of claw portions 31A are formed, for example, at equal intervals along the circumferential direction of the thrust washer 31. And this claw part 31 fits in the hole 4A formed in the pinion gear 4, whereby the thrust washer 31 is moved to the pinion gear 4.
It is stopped. The inner diameter of the thrust washer 31 is set to be larger than that of the other thrust washer 32, that is, the outer thrust washer 32 that is in contact with the carrier 10.
(See FIG. 2) is the center line O _{2 of the} needle bearing 14.
It is shifted radially inward by a predetermined distance L. On the other hand, the outer thrust washer 32 is made of a slippery bearing material such as copper and is rotatable about the pinion shaft 13.

An oil groove 11B is formed in the first carrier member 11, and a first hole 13A extending along the center axis of the pinion shaft 13, and a radial direction extending from an intermediate portion of the hole 13A. A second hole 13B penetrating outward;
A third hole 13C penetrating from the hole 13A in a direction facing the oil groove 11B is formed. The opening on the right side in FIG. 1 of the first hole 13 </ b> A is closed by the plug 15.

Next, the operation will be described.

The pinion gear 4 rotates according to the rotation state of the rotating shaft 1, the sun gear 2 and the internal gear 3.
The pinion gear 4 is, for example, a helical gear,
Depending on the rotation state, it receives the thrust force in the left and right direction in FIG.
Similarly, the needle bearing 14 also receives a thrust force in the same direction. These thrust forces are the thrust washers 3
The thrust washers 31 and 32 are pressed between the carrier 10 and the pinion gear 4 and the needle bearing 14 and the carrier 10.

At this time, since the inner thrust washer 31 rotates together with the pinion gear 4, relative rotation occurs between the washers 31, 32 or between the outer thrust washer 32 and the carrier 10. Therefore, the pinion gear 4 and the inner thrust washer 31
No wear occurs due to sliding contact. Further, the thrust washer 31 does not have a problem due to relative rotation with the pinion gear 4, that is, a problem that the thrust washer 31 is biased to slide on the outer peripheral surface of the pinion shaft 13, and uneven wear of the inner peripheral surface of the thrust washer 31 is avoided. It will also be.

On the other hand, lubricating oil is supplied to the rolling surface of the needle bearing 14 through the oil groove 11B and the holes 13C, 13A, 13B in order, and the needle bearing 14
After lubricating the thrust washers 31, 32, the oil which has been lubricated flows out of the carrier 10. By the way, as shown in FIG. 2, the inner thrust washer 31 has a smaller diameter than the outer thrust washer 32, and the outer peripheral portion 31B of the inner thrust washer 31 has a needle bearing 1B.
4 is located radially inward of the center line O ₂ ,
The lubricating oil that has lubricated the needle bearing 14 easily enters between the thrust washers 31 and 32 as shown by the arrow in FIG. Therefore, the space between the washers 31 and 32 is sufficiently lubricated, and their wear is prevented.

Further, the inner peripheral surface of the thrust washer 31 is not worn, and the gap between the inner peripheral surface and the pinion shaft 13 and the inner peripheral surface is always kept constant. The lubrication will be smooth. Therefore, a plurality of radially inwardly protruding portions are formed on the inner peripheral surfaces of the washers 31 and 32, that is, between the protruding portions and the pinion shaft 13.
It is not necessary to use a member that forms a passage for the lubricating oil between them.

[0018]

[Effect of the Invention] As described above, the planetary gear device of the present invention has a relatively rotatable interposition between the carrier and the planetary gear.
Of the multiple thrust washers
With regard to the inner thrust washer,
And the inner diameter is larger than other thrust washers.
Enlarge the inner circumference with the center line of the needle bearing
Because it is located radially inward of the
Between the inner circumference of the thrust washer on the side and the outer circumference of the shaft.
Needle bearing through the lubricating oil passage formed between
Make it easier for the lubricating oil in the
Between the thrust washers.
You. Moreover, the inner diameter must be
Turn the enlarged inner thrust washer around the planetary gear
In order to stop the thrust washer,
To avoid uneven wear due to uneven sliding contact with the outer peripheral surface of the
The distance from the shaft can always be kept constant.
As a result, the planetary gear and the inner thrust washer
Wear of the sliding surface and uneven wear of the thrust washer inside
Lubricating oil is sufficiently lubricated while preventing
Thrust washer and needle bearing durability
Can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a section II in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 rotating shaft 2 sun gear (sun gear) 3 internal gear (internal gear) 4 pinion gear (planetary gear) 4A hole 10 carrier 11, 12 carrier member 13 pinion shaft (shaft) 14 needle bearing 31 inner thrust washer 31A claw portion 32 Outer thrust washer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 57/08 F16H 1/28

Claims (2)

(57) [Scope of request for utility model registration] 1. A planet gear is rotatably supported on a shaft fixed to a carrier via a needle bearing, and a thrust washer fitted to the shaft is interposed between the carrier and the planet gear. In the planetary gear device, between the carrier and the planetary gear, the plurality of thrust washers are rotatably interposed, and among the plurality of thrust washers , an inner thrust washer that is in contact with the planetary gear is the thrust washer , Non-rotating on planetary gears
And the inner diameter is larger than other thrust washers.
Large and the inner circumference is the center of the needle bearing
Wire is positioned radially inward of the
A planetary gear device wherein a passage for lubricating oil is formed between the shaft and the shaft . 2. The inner thrust washer is prevented from rotating by the planetary gear by fitting a claw provided on the inner thrust washer with a hole provided on the planetary gear. The planetary gear device according to claim 1.