JP2588508Y2 - Planetary carrier lubrication system - 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 carrier lubrication device for lubricating around a pinion gear in a planetary gear device used for a transmission of a vehicle or the like.

[0002]

2. Description of the Related Art Conventionally, as a configuration around a pinion gear of this type, a configuration as disclosed in Japanese Utility Model Laid-Open Publication No. Sho 61-17562 is known. That is, in FIG. 4, a pinion shaft 53 is provided between the front and rear planetary carriers 51 and 52 with one end fixed by, for example, welding. A pinion gear 55 is rotatably supported on the pinion shaft 53 via a needle 54, and washers 56, 56 are provided before and after a center boss portion of the pinion gear 55, and both side surfaces of the pinion gear 55 are provided. Are directly planetary carriers 51,5
The inner surfaces of the two are not damaged by contact with each other or the rotational friction is not increased. Lubrication around the pinion gear configured as described above is performed such that lubricating oil is supplied from a sun gear shaft (not shown) and is dispersed and circulated in a gear case in which a planetary gear is arranged, so that internal components are lubricated. Has become.

[0003]

With the above-described lubricating means, when the pinion gear 55 or the planetary carriers 51 and 52 rotate, the lubricating oil escapes to the outer periphery of the gear case due to centrifugal force, and the needle 54
There is a problem in that the lubricating oil does not sufficiently stay in the washer 56 and seizure occurs. Therefore, the present invention
In view of the above conventional problems, it is an object of the present invention to provide a lubricating device for a planetary carrier in which a needle or a washer does not seize even when a pinion gear or a planetary carrier rotates.

[0004]

In order to achieve the above object, the present invention provides a planetary gear device in which a pinion shaft whose side is held by a washer is rotatably supported by a pinion shaft fixed to a planetary carrier. A seal ring surrounding a washer is provided in a gear pocket portion of the planetary carrier in which the pinion gear slides to form a washer chamber, and a replenishment passage for guiding lubricating oil to the washer chamber is provided in the pinion shaft; The lubricating device for a planetary carrier is provided with an elastic body for urging the seal ring toward the pinion gear. Also, a throttle passage communicating the washer chamber with the outside can be provided in the seal ring, or a throttle passage communicating the shaft hole and the tooth portion can be provided in the pinion shaft.

[0005]

The lubricating oil is supplied to the washer chamber surrounded by the seal ring from a replenishment passage provided in the pinion shaft, and the lubricating oil fills the washer chamber. When the planetary gear device rotates, centrifugal force acts on the lubricating oil in the washer chamber, but since the seal ring is urged toward the pinion gear by the elastic body, the lubricating oil is reliably held in the washer chamber. .

At this time, the pinion gear has a washer on the side surface so as not to directly contact the planetary carrier, but there is some side clearance. Therefore, when the pinion gear rotates, there is a case where the thrust force causes the pinion gear to be shifted forward or backward within the range of the side surface gap.However, since the seal ring can follow the shift of the pinion gear by the elastic body and always contact the pinion gear side surface, Also in this case, the lubricating oil in the washer chamber is securely held.
Therefore, the pinion gear side surface, the washer and the shaft hole of the pinion gear are prevented from galling and seizure due to insufficient lubricating oil.

In the case where a throttle passage communicating the washer chamber and the outside is provided in the seal ring, or a throttle passage communicating the shaft hole and the tooth portion is provided in the pinion shaft, the tooth of the pinion shaft is not provided. An appropriate amount of regulated lubricating oil is also supplied to the outer peripheral portion such as the portion, thereby preventing galling and seizure of the outer peripheral portion.

[0008]

1 shows an embodiment of the present invention applied to a planetary gear device. Before and after planetary carrier 1, 2
, A pinion shaft 3 is provided extending in the front-rear direction. The pinion shaft 3 is fixed to one of the planetary carriers 1 and 2 by, for example, welding. A pinion gear 5 is rotatably supported on the pinion shaft 3 via a needle 4, and a replenishment passage 6 connected to an oil passage leading to a lubricating oil pump (not shown) is provided at the axis of the pinion gear 5. The lubricating oil is provided to the rolling surface of the needle 4.

Further, an appropriate number of washers 7 are provided in the gear pocket portions 8 between the front and rear side surfaces of the pinion gear 5 and the inner surfaces of the front and rear planetary carriers 1 and 2, respectively.
The planetary carriers 1 and 2 of the front and rear
Are held with an appropriate gap between them. And
The gear pocket 8 is provided with a seal ring 9 made of, for example, a synthetic resin so as to surround the washer 7. The seal ring 9 slides on the side surface of the pinion gear 5 to seal the lubricating oil, and a guide groove 10 for guiding the seal ring 9 is provided on the inner surfaces of the planetary carriers 1 and 2.

An O-ring (elastic body) 11 made of rubber, for example, is provided in the back of the guide groove 10.
Are urged to press the side surface of the pinion gear 5. Further, the O-ring 11 is in contact with the bottom of the guide groove 10 and the seal ring 9 and also serves as an oil seal. As a result, a sealed washer chamber 12 surrounded by the seal ring 9 and the O-ring 11 is formed.

The present embodiment is constructed as described above. When the lubricating oil is supplied to the washer chamber 12 including the needle 4 and the washer 7 via the replenishing passage 6, the washer chamber 12 is sealed with the seal ring 9 and the O-ring. The lubricating oil is held in the washer chamber 12 because it is sealed with the lubrication oil 11. And
Even if the pinion gear 5 rotates together with the planetary carriers 1 and 2 and centrifugal force acts on the lubricating oil in the washer chamber 12,
The lubricating oil in the washer chamber 12 sealed by the seal ring 9 and the O-ring 11 is securely held, thereby preventing the washer 7 and the needle 4 from malfunctioning due to galling or seizure due to insufficient lubricating oil.

Further, the pinion gear 5 shifts back and forth between the planetary carriers 1 and 2 within the range of the above-mentioned side gap due to thrust force during rotation. Thus, the lubricating oil can be reliably held in the washer chamber 12 in this case as well.

FIG. 2 shows a second embodiment of the invention.
The lubricating oil supplied from the refill passage is also used for lubricating the outer peripheral portion of the pinion gear. Here, an appropriate number of throttle passages 13 are provided from the shaft hole 5a forming the rolling surface of the needle 4 of the pinion gear 5 'to the tooth portion 5b. Other configurations are the same as those shown in FIG. As a result, the lubricating oil supplied from the lubricating oil pump to the rolling surface of the needle 4 through the replenishing passage 6 is guided to the washer chamber 12 via the needle portion, and is also supplied from the throttle passage 13 to the appropriate amount regulated by the hole diameter. Is guided to the outer peripheral portion.
The lubricating oil guided or leaked to the outer peripheral portion is collected again in a lubricating oil reservoir (not shown), and is supplied again from the lubricating oil pump to the washer chamber 12 through the replenishment passage 6.

As described above, according to the present embodiment, the needle 4 and the washer 7 are always filled with the lubricating oil by the sealing action between the seal ring and the O-ring, so that the needle portion, the side portion of the pinion gear 5 'and There is an effect that the planetary carriers 1 and 2 are prevented from occurrence of a galling accident or a burn-in accident. In addition, the throttle passage 13 guides an appropriate amount of lubricating oil to the outer peripheral portion, so that galling and seizure of the tooth surfaces of the pinion gear 5 'and the ring gear (not shown) meshing therewith are prevented.

FIG. 3 shows a third embodiment, in which the lubricating oil supplied from the replenishment passage is also used for lubricating the outer peripheral portion of the pinion gear, as in the previous embodiment. Here, slit-shaped throttle passages 14 are provided in the seal ring 9 'at appropriate intervals in the circumferential direction. Other configurations are shown in FIG.
Is the same as that shown in FIG. Thereby, the washer chamber 1 is supplied from the lubricating oil pump through the replenishment passage 6 and the needle portion.
Of the lubricating oil guided to 2, the appropriate amount regulated by the passage area of the throttle passage 14 leaks from the throttle passage 14 to the outer peripheral portion.

According to this embodiment, the seal ring and the O
Due to the sealing action with the ring, the needle 4 and the washer 7 are always filled with the lubricating oil, so that the side of the pinion gear 5 and the planetary carriers 1 and 2 from the needle portion are prevented from galling and seizure. Thus, an appropriate amount of lubricating oil is also guided to the outer peripheral portion of the seal ring 9 and is supplied to the tooth surfaces of the pinion gear 5 and the ring gear, so that an effect of preventing galling and seizure thereof is obtained.

[0017]

As described above, according to the present invention, since the seal ring constantly urged in the lateral direction of the pinion gear by the elastic body is provided around the outer periphery of the washer, the lubricating oil supplied from the refill passage is provided. Even when the pinion gear and the planetary carrier are rotated and centrifugal force acts on the lubricating oil, there is an effect that the washer and the pinion shaft are prevented from being broken or seizure is caused. Further, when the throttle passage is provided in the pinion gear or the seal ring, the lubricating oil is also supplied to the outer peripheral portion of the seal ring, so that the parts on the outer peripheral portion of the seal ring are also prevented from galling and seizure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment.

FIG. 3 is a sectional view showing a third embodiment.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 1, 2 Planetary carrier 3 Pinion shaft 4 Needle 5, 5 'Pinion gear 5a Shaft hole 5b Teeth 6 Refill passage 7 Washer 8 Gear pocket 9, 9' Seal ring 10 Guide groove 11 O-ring (elastic body) 12 Washer chamber 13 , 14 throttle passages 51, 52 planetary carrier 53 pinion shaft 54 needle 55 pinion gear 56 washer

Claims (3)

(57) [Scope of request for utility model registration] 1. A planetary gear device in which a pinion gear whose side surface is held by a washer is rotatably supported by a pinion shaft fixed to a planetary carrier, wherein the washer is provided in a gear pocket portion of the planetary carrier in which the pinion gear slides. An elastic body that forms a washer chamber by providing a seal ring surrounding the pinion, provides a replenishment passage for guiding lubricating oil to the washer chamber on the pinion shaft, and further urges the seal ring on the planetary carrier toward the pinion gear. A lubricating device for a planetary carrier, comprising: 2. The pinion shaft according to claim 1, wherein a throttle passage communicating the shaft hole with the tooth portion is provided in the pinion shaft, and the regulated lubricating oil is guided to the tooth portion side. A lubricating device for a planetary carrier as described in the above. 3. The seal ring according to claim 1, wherein a throttle passage communicating with the washer chamber and the outside is provided in the seal ring so as to leak regulated lubricating oil to the outside. Planetary carrier lubrication device.