JPH0738758Y2 - Lubrication device for planetary gear unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a lubricating device for a planetary gear device.

(B) Conventional technology As a lubricating device for a conventional planetary gear device, for example,
There is one shown in FIG. 13 of the −105426 publication. In the lubrication device for a planetary gear device shown in this figure, a bearing race of a thrust bearing is arranged adjacent to a pinion carrier, and a cutout portion is provided on a side edge of the bearing race on the carrier side. The oil scattered by centrifugal force is collected in the groove formed by the notch, and the oil is supplied to the needle bearing supporting the pinion gear through the radial hole provided in the pinion carrier.

(C) Problems to be Solved by the Invention However, in the conventional lubrication device for the planetary gear device as described above, although the oil scattered in the notches of the bearing race can be collected, the pinion is better than this. There is a problem that the oil that has scattered to the side far from the carrier, that is, the thrust bearing side cannot be collected, and a sufficient amount of oil cannot be sent to the needle bearing. The oil not collected by the notch flows through the clearance of the thrust bearing to the outer peripheral side of the pinion carrier. The present invention aims to solve such problems.

(D) Means for Solving the Problems The present invention solves the above problems by extending the bearing race toward the inner diameter side and bending the bearing race toward the thrust bearing side. That is, the present invention provides two plate-shaped members (12a) parallel to each other of the pinion carrier (12).
The pinion gear (14) is rotatably supported by the pinion shaft (16) fixed between the pinion carrier (12a) and the pinion carrier (12b) via a needle bearing (18). There is an oil hole (24) that extends from the inner diameter of the pinion shaft to the fixed part of the pinion shaft, and the pinion shaft is provided with an oil hole (26) that connects the oil hole of the pinion carrier and the rolling surface of the needle bearing. And a lubrication device for a planetary gear device in which a thrust bearing (34) is arranged via a bearing race (32) on the outer side of a plate-shaped member on the side where the oil hole of the pinion carrier is provided. The small diameter portion (32a) having a smaller diameter than the inner diameter portion of the plate member of the pinion carrier is provided on a part of the inner circumference of the bearing race. It is characterized in that it is bent to the side away from the pinion carrier. The reference numerals in parentheses indicate the corresponding members in the embodiments described later.

(E) Action Oil scattered from the inner diameter side of the pinion carrier to the outer peripheral direction flows into the oil hole of the pinion carrier and is further supplied to the needle bearing through the oil hole of the pinion shaft. At this time, a part of the oil that is about to be scattered toward the thrust bearing is captured by the bent small diameter portion of the bearing race, flows along this, and is fed into the oil hole of the pinion carrier. Therefore, the oil that has conventionally leaked without being used for lubricating the needle bearing is effectively used for lubricating the needle bearing.

(F) Embodiment An embodiment of the present invention is shown in FIG. The carrier assembly 10 has a pinion carrier 12, a pinion gear 14, and a pinion shaft 16. The pinion carrier 12 has plate-like members 12a and 12b that are integrally connected to face each other. The pinion shaft 16 has plate-like members 12a at both ends thereof.
And 12b. A pinion gear 14 is rotatably supported on the outer periphery of the pinion shaft 16 via a needle bearing 18. Thrust washers 20 are arranged on both sides of the pinion gear 14. An annular groove 22 is provided on the inner peripheral portion of the plate member 12a, and an oil hole 24 is provided outward from the groove 22 in the radial direction. The oil hole 24 communicates with an oil hole 26 provided in the pinion shaft 16. The oil hole 26 has an opening on the rolling surface of the needle bearing 18 on the outer circumference of the pinion shaft 16. A sun gear 28 is arranged inside the carrier assembly 10, and the sun gear 28 meshes with the pinion gear 14. On the other hand, an internal gear 40 is provided outside the carrier assembly 10, and the internal gear 40, the carrier assembly 10 and the sun gear 28 constitute a planetary gear device. The cylindrical sun gear 28 is provided with an oil hole 30 communicating from the inner diameter portion to the tooth bottom.
A bearing race 32 is provided on the left side of the plate member 12a in FIG. 1, and a thrust bearing 34 is provided so as to roll on the surface thereof. Thrust bearing
34 is held by another adjacent member 36, which is integral with the sun gear 28. The inner diameter portion side of the bearing race 32 has four small diameter portions 32a having a diameter smaller than that of the plate member 12a, and the small diameter portion 32a is bent so that the inner diameter portion side is away from the plate member 12a.

Next, the operation of this embodiment will be described. Oil is supplied to the oil hole 30 of the sun gear 28 from a lubricating circuit provided on a shaft (not shown) arranged in the inner diameter portion of the sun gear 28. Oil hole
The oil discharged from 30 to the outer diameter side of the sun gear 28 is an annular groove.
It is compensated by 22 and is supplied to the rolling surface of the needle bearing 18 through the oil hole 24 and the oil hole 26. This allows
The needle bearing 18 is lubricated. A part of the oil discharged from the oil hole 30 tries to go to the thrust bearing 34 side, but the bearing race 32 has a small diameter portion 32a, and since this is bent to the thrust bearing 34 side, the thrust bearing 34 A part of the oil that tries to flow to the side is blocked by the small diameter portion 32a and is flowed to the annular groove 22 side. As a result, a large amount of oil is supplied to the needle bearing 18 through the oil holes 24 and 26, and the needle bearing 18 can be sufficiently lubricated.

Since the small diameter portion 32a of the bearing race 32 is not provided over the entire circumference, the required amount of oil for the thrust bearing 34 side is also secured.

(G) Effect of the Invention As described above, according to the present invention, the bearing race is provided with the small diameter portion that is bent toward the inner diameter side, so that the scattered oil is guided to lubricate the needle bearing. Therefore, the amount of lubricating oil for the needle bearing is increased and the durability of the carrier assembly is improved.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a front view showing a bearing race, and FIG. 3 is a sectional view of the bearing race. 10 ... Carrier assembly, 12 ... Pinion carrier, 12a ... Plate member, 14 ... Pinion gear, 16 ... Pinion shaft, 18
… Needle bearing, 24… Oil hole, 26… Oil hole, 28… Sun gear, 32… Bearing race, 32a… Small diameter part, 34… Thrust bearing.

Claims (1)

[Scope of utility model registration request] 1. A pinion gear is rotatably supported via a needle bearing on a pinion shaft fixed between two parallel plate-shaped members of a pinion carrier, and one plate-shaped member of the pinion carrier is There is an oil hole that extends from the inner diameter of this to the fixed part of the pinion shaft, and the pinion shaft has an oil hole that connects the oil hole of the pinion carrier and the rolling surface of the needle bearing to each other. In a lubrication device for a planetary gear device in which a thrust bearing is arranged on the outer side of the plate-shaped member on the side where the oil hole is provided, through a bearing race, a pinion is provided at a part of the inner circumference of the bearing race. The carrier is provided with a small diameter portion having a diameter smaller than the inner diameter portion of the plate-shaped member. A lubrication device for a planetary gear device, which is bent toward the side away from the rear.