JPH0752997Y2 - Lubrication structure of planetary gear unit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for a planetary gear device, and more particularly to a lubricating structure suitable for a planetary gear device for an automatic transmission.

[0002]

2. Description of the Related Art Conventionally, in a planetary gear device for an automatic transmission, as a structure for supplying lubricating oil to a pinion (planetary gear), as described in Japanese Utility Model Laid-Open No. 63-49053, a lubricating hole is provided inside a carrier. It is known that the lubrication hole is formed in the radial direction, the outer end of the lubrication hole is sealed with a plug that also serves as a rotation stop for the pinion shaft, and the lubrication hole is communicated with one end of the axial center hole of the pinion shaft. The other end of the shaft center hole is sealed with another plug, a hole orthogonal to the shaft center hole is provided in the middle part of the pinion shaft, and the lubricating oil is supplied from the orthogonal hole to the inner diameter part of the pinion. ing.

[0003]

However, in the case of the lubricating structure as described above, two plugs are required for each pinion shaft, and at least three pinion shafts are arranged in one planetary gear device. Therefore, at least 6 plugs are required. Therefore, there is a problem that the number of parts increases, the number of assembly steps increases, and the cost becomes high.

Therefore, an object of the present invention is to provide a lubrication structure for a planetary gear device in which the number of parts and the number of assembling steps are reduced and the lubricating oil can be efficiently supplied to the pinion.

[0005]

To achieve the above object, the present invention provides a lubricating oil passage formed from an inner diameter side of a carrier toward an outer diameter direction, and an inner diameter side of the carrier at an end of a pinion shaft. The pinion shaft is formed so as to face the lubricating oil passage, and one end of the pinion shaft is opened to the notch and the other end is opened to the outer diameter side of the carrier. A lubricating hole for supplying lubricating oil to the inner diameter portion of the above, and a deformed hole formed in the thrust washer to prevent the pinion shaft from rotating by fitting into the cutout portion.

The oil flowing in the outer diameter direction along the lubricating oil passage of the carrier reaches the cutout portion of the pinion shaft. here,
Lubricating oil enters an oblique lubricating hole provided in the pinion shaft by centrifugal force and is guided to the inner diameter portion of the pinion through the lubricating hole, so that the pinion can be efficiently lubricated. Further, the lubricating oil passage of the carrier and the lubricating hole of the pinion shaft do not need to be sealed with a plug or the like at all, and since the thrust washer also serves as a positioning component for the pinion shaft, the number of components is small and the number of assembly steps is not increased.

[0007]

1 and 2 show an example of a Ravigneaux type planetary gear unit 3. Forward sun gear 3 is integrated with the input shaft 5.
b is formed, and the reverse sun gear 3 a is rotatably supported on the input shaft 5. A carrier 3c is rotatably supported on the input shaft 5, and the carrier 3c is composed of a hub portion 10 and a cover portion 20. The hub part 1
Three protrusions 11 protruding in the direction of the cover 20 are integrally formed with 0, and two types of pinions 3d and 3e meshing with each other are arranged in the space between the protrusions 11.
The reverse sun gear 3a meshes with a long pinion 3d having a long shaft length, and the forward sun gear 3b meshes with a short pinion 3e having a short shaft length. The long pinion 3d also meshes with the ring gear 3f, and the ring gear 3f is formed integrally with the output shaft 4.
A spline 26 is formed on the outer peripheral surface of the cover portion 20 to engage with a clutch plate of a brake (not shown).
The protrusion 11 and the cover 20 are integrally connected by a slot pin 30 and a flat head screw 31.

Bearing holes 14 and 24 are formed at opposed positions of the hub portion 10 and the cover portion 20, and pinion shafts 40 and 41 are bridged in these bearing holes. The pinion shafts 40 and 41 rotatably support the long pinion 3d and the short pinion 3e via needle bearings 42 and 43, respectively. In addition, short pinion 3
The position of e is restricted to the hub portion 10 side by the spacer 45. Notches 40a and 41a are formed at both ends of the pinion shafts 40 and 41, and thrust washers 44 provided with two modified holes 44a and 44b that fit into these notches are provided on the outer surfaces of the pinions 3d and 3e. And carrier 3
It is arranged between the inner side surface of c. Then, the both ends of the pinion shafts 40 and 41 are connected to the thrust washer 4
By fitting in the four modified holes 44a and 44b, rotation and axial movement of the pinion shafts 40 and 41 are restricted. In particular, the thrust washer 44 is arranged so that the flat surface of the deformed hole 44a always faces inward as shown in FIG. The reason is that the washer 44 has an asymmetrical outer shape, and if it is attempted to reversely assemble it so that the flat surface is on the outer diameter side, a part of the thrust washer 44 interferes with the reverse sun gear 3a. This is because it becomes impossible to assemble. In this way, since the flat surface of the deformed hole 44a is always on the inner side, the cutout portion 40a of the pinion shaft 40 is formed.
Is also positioned so that it always faces inward. In this embodiment, the cutout portion 41a of the pinion shaft 41 is also positioned so as to face inward.

Inside the pinion shaft 40 supporting the long pinion 3d, an oblique lubricating hole 40b is formed, one end of which is opened to the cutout 40a and the other end of which is opened to the outer diameter side of the carrier at the center. ing. In particular, the lubricating hole 40b
The end side opening of the is a bottomed drill hole 40 formed in the orthogonal direction.
It communicates with c. On the other hand, on the inner side surface of the hub portion 10, a groove 12 for lubrication is formed from the inner diameter portion toward the outer diameter direction, and the outer peripheral end portion of the groove 12 has a bearing hole 14 into which the pinion shaft 40 is fitted. Has been extended to.

Now, the pinion lubrication action of the planetary gear device will be described. The lubricating oil supplied through the shaft center hole 5a of the input shaft 5 flows through the drill hole 5b in the orthogonal direction and flows in the outer diameter direction along the groove 12 of the carrier 3c. Then, at the end of the groove 12, the lubricating oil hits the notch 40a of the pinion shaft 40, where a part of the notch 40a is thrust.
4 is lubricated, and most of it enters the diagonal lubrication hole 40b by centrifugal force. Then, the lubricating oil that has passed through the lubricating hole 40b is guided to the middle of the needle bearings 42 provided in two rows, and evenly lubricates the needle bearings 42. Since the pinion shaft 40 is formed with the lubricating hole 40b extending in an oblique direction from the hub portion 10 side as well as from the cover portion 20 side toward the central portion, the cover portion 20
The oil that has flowed into the notch 40a from the side is also used for the lubricating hole 40b.
Through the needle bearing 42. In this case, if a lubricating oil passage is provided on the inner side surface of the cover portion 20 as in the hub portion 10, the lubricity is further improved.

It goes without saying that the planetary gear device of the present invention is not limited to the Ravigneaux type. In the case of the Ravigneaux type,
Not only the long pinion shaft 40 but also the short pinion shaft 41 may be similarly provided with a lubricating hole.

The lubricating oil passage of the carrier may be not only the groove 12 formed on the inner surface of the carrier but also a hole formed inside the carrier.

Two lubrication holes 40b of the pinion shaft 40 are formed diagonally from both ends toward the central portion, but only one of them may be formed. Further, although the lubrication hole of the pinion shaft is composed of the oblique hole 40b and the orthogonal hole 40c, only the oblique hole may be used. However, if the outlet that opens in the center of the pinion shaft is formed with a rectangular hole, the axial length of the outlet can be shortened, so the amount of overlap with the needle bearing 42 can be reduced, and the edge of the pinion shaft is chipped. It has the effect of preventing damage to the needle bearing.

[0014]

As is apparent from the above description, according to the present invention, the notches at both ends of the pinion shaft are arranged so as to face inward by the irregular holes of the thrust washer, and the lubricating oil for the notches and the carrier is provided. Corresponding to the road,
Since the lubricating hole is formed in the pinion shaft in the oblique direction from the cutout portion toward the outer diameter side of the carrier, the lubricating oil is efficiently supplied to the inner diameter portion of the pinion by the centrifugal force.
Also, the lubricating oil passage of the carrier and the lubricating hole of the pinion shaft do not need to be sealed with a plug or the like at all, and since the pinion shaft rotation stop and the notch part positioning are shared by the thrust washer, the number of parts is small and the assembly is small. Does not increase man-hours.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a planetary gear device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 3 Planetary Gear Device 3a Reverse Sun Gear 3b Forward Sun Gear 3c Carrier 3d, 3e Pinion 3f Ring Gear 12 Groove (Lubricating Oil Path) 40 Pinion Shaft 42 Needle Bearing 40a Notch 40b Lubrication Hole 44a Deformed Hole 44 Thrust Washer

Claims (1)

[Scope of utility model registration request] 1. A pinion shaft is fitted and supported on a carrier, a pinion is rotatably supported on an outer periphery of the pinion shaft, and a thrust washer is arranged between a side surface of the pinion and a side surface of the carrier. In the planetary gear device, a lubricating oil passage formed from the inner diameter side of the carrier toward the outer diameter direction and a lubricating oil passage formed at the end of the pinion shaft facing the inner diameter side of the carrier and corresponding to the lubricating oil passage. A notch portion, a lubricating hole that is formed obliquely inside the pinion shaft so that one end opens in the notch portion and the other end opens toward the carrier outer diameter side, and that supplies lubricating oil to the inner diameter portion of the pinion. A lubrication structure for a planetary gear device, characterized in that the thrust washer is provided with a modified hole for preventing the pinion shaft from rotating by fitting in the cutout portion.