JPH094700A - Lubrication structure of planetary gear mechanism - Google Patents

Abstract

PURPOSE: To facilitate good lubrication for a bearing which supports a pinion gear without increasing the number of parts to be used by fitting a guide claw extended into an oil guide hole of a pinion shaft onto an oil guide plate. CONSTITUTION: Lubricating oil supplied to the oil hole 15b of a rotating power shaft 15 runs through a communicating hole 15a which communicates with the oil hole 15b by a rotational force of the power shaft 15, and slows out to the outer periphery of the power shaft 15. The flowing-out lubricating oil runs through a space of a bearing 13, is led to between an oil guide plate 9 and a carrier 3, is flown into an oil guide hole 8a of a pinion shaft 8 along a guide claw 9a of an oil guide plate 9, and is finally supplied to a bearing 7 for supporting a pinion gear 2. The guide claw 9a extended into the oil guide hole 8a of the pinion shaft 8 is formed at the oil guide plate 9, so the lubricating oil flows into the guide hole 8a of the pinion shaft 8 along the guide claw 9a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication structure for a planetary gear mechanism used in an engine of an automobile or the like, and more particularly to a lubrication structure for a bearing that supports a pinion gear.

[0002]

2. Description of the Related Art Conventionally, a plurality of planetary gears (pinion gears)
In the automatic transmission having, the driving force from the power shaft was output via the planetary gear mechanism arranged on the power shaft. The structure of such a planetary gear mechanism will be described with reference to FIG. The sun gear 105, the plurality of pinion gears 102, and the ring are formed on the outer periphery of the power shaft 115 in which the oil hole 115b for circulating the lubricating oil is formed, and the communication holes 115a and 115c communicating with the oil hole 115b and opening to the outer periphery are formed. The gear 110 is sequentially meshed toward the outer periphery, the pinion shaft 108 is fitted to the inner periphery of the pinion gear 102 via the bearing 107, and the pair of carriers 103, 104 are provided at both ends in the axial direction of the pinion shaft 108.
The planetary gear mechanism 101 to which is fixed is mounted. An oil guide plate 109 that collects lubricating oil is fixed to one carrier 103 of the planetary gear mechanism 101, and one end of the pinion shaft 108 is opened toward the oil guide plate 109 side of the pinion shaft 108 and the other end is inside. Oil guide hole 108 opening to the bearing 107 side
a is formed.

The lubrication structure of the planetary gear mechanism 101 will be described. First, the oil hole 115b of the rotating power shaft 115
The lubricating oil that is supplied to the power transmission shaft 115 passes through the communication hole 115c that communicates with the oil hole 115b by the rotational force of the power shaft 115, and flows out to the outer periphery of the power shaft 115. As shown in FIG. 5, the lubricating oil that has flowed out is guided to the oil guide plate 109 (arrow X), passes through the oil guide hole 108 a formed inside the pinion shaft 108, and then passes through the pinion gear 10.
It was supplied to the bearing 107 which supports 2.

As described above, the lubricating oil is supplied to the pinion gear 102.
As a lubrication structure of the planetary gear mechanism 101 in which the oil guide plate 109 is provided on the carrier 103 to supply the bearing 107 for supporting the
There are many publications such as Japanese Patent No. 1 and Japanese Utility Model Publication No. 61-6065.

[0005]

SUMMARY OF THE INVENTION The carrier 103 described above.
Planetary gear mechanism 1 in which oil guide plate 109 is provided in the
In the lubrication structure of 01, the oil guide plate 10
Since 9 serves as an oil reservoir for the lubricating oil and guides the lubricating oil to the oil guide hole 108a of the pinion shaft 108, the bearing 107 supporting the pinion gear 102 can be satisfactorily lubricated.

However, the oil guide plate 109 is
Since it is fixed to the carrier 103 by means such as caulking, it is difficult to bring the oil guide plate 109 and the carrier 103 into close contact with each other without a gap. Therefore, the lubricating oil accumulated in the oil guide plate 109 may leak to the outside through the gap between the mounting surfaces of the oil guide plate 109 and the carrier 103 due to the centrifugal force generated by the rotation of the planetary gear mechanism 101. . Therefore, the amount of the lubricating oil introduced into the oil guide hole 108a of the pinion shaft 108 may decrease below a predetermined amount, and the lubricity of the bearing 107 that supports the pinion gear 102 may deteriorate.

Therefore, in order to prevent the lubricating oil accumulated in the oil guide plate 109 from leaking to the outside,
It is conceivable to interpose a seal member such as an O-ring made of an elastic body on the mounting surface between the oil guide plate 109 and the carrier 103. This can prevent the lubricating oil from leaking to the outside. However, the oil guide plate 10
If a seal member is interposed between the mounting surfaces of the carrier 9 and the carrier 103, the number of parts may increase and the assemblability may deteriorate.

Therefore, the present invention solves the above problems,
An object of the present invention is to provide a lubrication structure of a planetary gear mechanism that can favorably lubricate a bearing that supports a pinion gear without increasing the number of parts.

[0009]

The structure of the present invention is as follows.

A pinion gear, a pinion shaft that supports the pinion gear via bearings, a pair of carriers integrally fixed to both ends of the pinion shaft in the axial direction, and an oil guide fixed to one carrier of the carrier. In the lubrication structure of the planetary gear mechanism, the pinion shaft is provided with an oil guide hole having one end opening toward the oil guide plate side of the pinion shaft and the other end opening toward the bearing side. A guide claw extending into the oil guide hole of the shaft is formed.

[0011]

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

FIG. 1 is a partial sectional view showing an embodiment of a lubricating structure of a planetary gear mechanism 1 according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a carrier 3, 4, a pinion gear 2 and an oil guide. FIG. 5 is a side view of a carrier assembly 31 having a plate 9.

First, the structure near the planetary gear mechanism 1 will be described with reference to FIG. A power shaft 15 is provided with an oil hole 15b connected to an oil pump (not shown) along the axis and communicates with the oil hole 15b.
A plurality of 5a and 15c are provided. External teeth 15d are formed on the outer circumference of the power shaft 15, and the internal teeth 5d formed on the inner circumference of the sun gear 5 of the planetary gear mechanism 1 mesh with the external teeth 15d.

The planetary gear mechanism 1 includes a sun gear 5 having inner teeth 5d on the inner circumference and first outer teeth 5a and second outer teeth 5b on the outer circumference, and a pinion gear meshing with the first outer teeth 5a of the sun gear 5. Carrier assembly 31 having 2 and carrier assembly 3
Inner teeth 10 located on the outer peripheral side of 1 and meshing with the pinion gear 2
and a ring gear 10 in which b is formed. As shown in FIGS. 1 and 3, the carrier assembly 31 is provided with three pairs of paired pinion gears 2 and 2, each of which is in mesh with each other. The pinion gear 2 has a pinion shaft 8 through a bearing 7 on the inner peripheral side thereof.
Is provided. Inside the pinion shaft 8, an oil guide hole 8a is formed, one end of which opens toward the oil guide plate 9 side of the pinion shaft 8 and the other end of which opens toward the bearing 7 side. Further, a pair of carriers 3 and 4 are fixed to both ends of the pinion shaft 8 in the axial direction by caulking the caulking portion 6, while an oil guide plate 9 that guides lubricating oil is fixed to the carrier 3. The oil guide plate 9 has a notch formed with a guide claw 9a extending into the oil guide hole 8a at a position facing the oil guide hole 8a.

Next, the lubricating structure of the planetary gear mechanism 1 will be described. The lubricating oil supplied to the oil hole 15b of the rotating power shaft 15 is the oil hole 15 due to the rotational force of the power shaft 15.
It passes through a communication hole 15a communicating with b and flows out to the outer periphery of the power shaft 15. The lubricating oil that has flowed out passes through the space between the bearings 13 and is guided between the oil guide plate 9 and the carrier 3 as shown in FIG. 2, and along the guide claws 9a of the oil guide plate 9 (arrow Y). Pinion shaft 8
The oil is introduced into the oil guide hole 8a, and finally supplied to the bearing 7 that supports the pinion gear 2.

Accordingly, since the guide claw 9a extending into the oil guide hole 8a of the pinion shaft 8 is formed in the oil guide plate 9, the lubricating oil flows into the oil guide hole 8a of the pinion shaft 8 along the guide claw 9a. Because
Lubricating oil can be stably supplied to the bearing 7 that supports the pinion gear 2.

Although the oil guide plate 9 is notched to form the guide claw 9a in the above-described embodiment, the guide claw 9a may be press-formed at the same time when the oil guide plate 9 is pressed.

Further, although the planetary gear mechanism applied to the automatic transmission has been described in the above embodiment, it may be applied to the planetary gear mechanism of another power transmission device.

[0019]

As described above, according to the present invention, since the guide claw extending into the oil guide hole of the pinion shaft is formed in the oil guide plate, the lubricating oil is the oil of the pinion shaft along the guide claw. Since it flows into the guide hole, the lubricating oil can be stably supplied to the bearing that supports the pinion gear, and the bearing can be satisfactorily lubricated without increasing the number of parts.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a lubrication structure of a planetary gear mechanism according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a side view showing a carrier assembly according to an embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a lubrication structure of a conventional planetary gear mechanism.

FIG. 5 is an enlarged view of a portion B in FIG. 4;

[Explanation of symbols]

 2 Pinion gear 3 Carrier 4 Carrier 7 Bearing 8 Pinion shaft 8a Oil guide hole 9 Oil guide plate 9a Guide claw

Claims (1)

[Claims] 1. A pinion gear (2), a pinion shaft (8) for supporting the pinion gear (2) via a bearing (7), and an integral body at both axial end portions of the pinion shaft (8). A pair of carriers (3) fixed to the
(4) and an oil guide plate (9) fixed to one carrier (3) of the carriers (3) and (4), the pinion shaft (8) has one end of the pinion shaft (8). An oil guide hole (8) having an opening on the oil guide plate (9) side and the other end opening on the bearing (7) side.
In the lubrication structure of the planetary gear mechanism in which a) is formed, a guide claw (9a) extending into the oil guide hole (8a) of the pinion shaft (8) is formed in the oil guide plate (9). Lubrication structure of planetary gear mechanism characterized by.