JPH0647764U - Lubrication device for planetary gear unit - Google Patents

Abstract

(57) [Summary] [Purpose] To supply sufficient oil to the pinion shaft with a simple structure in the carrier of the planetary pinion gear. A guide groove 22 is formed on the inner diameter end surface of the plate portion 10 of the carrier on the inner diameter side of the pinion shaft over the entire circumference in the circumferential direction. On the inner diameter surface of the carrier beam extending from the plate portion, an oil catching portion 19 is formed by a concave portion in which the bottom wall 18 is the same as the guide groove or near the center of rotation. The oil catcher connects to the guide groove at its axial end. The plate portion is further provided with a communication groove 23 extending in the outer diameter direction from the guide groove and reaching the shaft hole 20 for the pinion shaft. When the carrier rotates, the oil trapped in the oil trap is smoothly guided to the shaft hole through the guide groove along the direction of centrifugal force, and is supplied to the pinion shaft to reliably prevent seizure and the like. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubrication device for a planetary gear device used in an automatic transmission for vehicles.

[0002]

[Prior art]

 Required lubrication is applied to various rotating elements in an automatic transmission.Especially for gears that rotate on the main shaft of the transmission, lubricating oil is applied to the rotating surface and tooth surfaces via oil passages formed in the main shaft. It is supposed to be guided. However, regarding the planetary gear device, in particular, in the case of a pinion shaft that is mounted on a carrier and supports a pinion gear that rotates between a sun gear and an internal gear, it is not possible to provide an internal oil passage that communicates from the main shaft, etc. However, the structure is complicated and the processing man-hours are large, so it is difficult to adopt it easily. For this reason, the oil that is agitated and scattered by the rotation of the rotating elements in the vicinity of the oil reservoir of the transmission case or the oil that is scattered by the centrifugal force from the sun gear must be captured and used for lubrication.

As a conventional lubrication device of such a system, for example, Japanese Patent Laid-Open No. 61-6065 discloses a lubrication device as shown in FIG. In this device, a passage 37 is formed in the pinion shaft 32 supported by the carrier plate 30, and a pinion shaft outer peripheral surface 32a, which is a rotation surface, is formed in the widthwise center of the pinion gear 34 rotating on the pinion shaft 32. A hole 38 that connects the passage 37 is provided.

On the opposite side of the carrier plate 30 from the side supporting the pinion gear 34 on the pinion shaft, a cap-shaped oil catcher 40 is engaged with the outer peripheral edge of the carrier plate, and this oil catcher 40 is attached to the carrier plate 30. In the radial direction, it overlaps with the opening 37a of the passage 37 of the pinion shaft. As a result, the scattered oil is caught by the oil catcher 40, guided to the passage 37 of the pinion shaft, and the oil is supplied from the hole 38 to the rotating surface of the pinion gear 34.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional lubrication device, the oil catcher has only a slight overhang, so that there is a problem that the amount of trapped scattered oil is small. As measures against this, for example, the one disclosed in Japanese Patent Laid-Open No. 2-72243 has an oil sump member disposed integrally with a carrier and located between pinion gears, and this oil sump member The inner diameter side of the is an oil reservoir that stores the oil scattered from the rotation center axis side such as the sun gear. Then, the oil is made to flow out from this oil reservoir toward the pinion gear. As a result, a large-area oil reservoir is arbitrarily provided up to the entire width of the pinion gear to collect sufficient oil and supply it to the pinion gear.

However, even with this lubricating structure, the oil collected in the oil sump is only configured to flow out toward the tooth surface of the pinion gear, so that sufficient oil is not applied to the tooth surface of the pinion gear. It is supplied, but not even to the rotating sliding surface of the pinion shaft that supports it. Since the pinion gear is under a load condition in which the number of rotations is particularly large compared to other rotating elements, insufficient supply of oil may cause seizure such as needle bearing on the rotating sliding surface of the pinion shaft. Therefore, in view of the above problems, it is an object of the present invention to provide a lubrication device for a planetary gear device, which has a simple structure to secure a sufficient amount of oil and supplies the oil to a pinion shaft.

[0007]

[Means for Solving the Problems]

 Therefore, according to the present invention, the pinion shaft is supported between the plates connected by the carrier beam, and the pinion gear supported by the pinion shaft is provided in a meshed state between the sun gear and the ring gear to lubricate the planetary gear unit. In the device, an oil trap portion having a bottom wall located on the inner diameter side of the pinion shaft is formed on the inner peripheral surface of the carrier beam, and the plate has a ring-shaped guide groove to which the oil trap portion is connected. And a communication groove that connects the guide groove and a shaft hole through which the pinion shaft is inserted.

[0008]

[Action]

 Since the oil trap is formed on the inner surface of the carrier beam, a large area across the entire width of the pinion gear between the plates can be used for trapping scattered oil. Since the bottom wall of the oil trap is located on the inner diameter side of the pinion shaft, the trapped oil is smoothly guided from the oil trap to the shaft hole along the direction of centrifugal force, and sufficient oil is retained in the pinion. Supplied to the shaft.

[0009]

【Example】

 1 to 3 show an embodiment of the present invention, in particular, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a perspective view of an essential part. Note that FIG. 1 shows only the carrier portion. A carrier is formed of ring-shaped plate portions 10 and 11 which are separated from each other, and a carrier beam 17 which extends between the plate portions 10 and 11 and connects them. A plurality of pinion shafts 12 are provided at predetermined intervals in the circumferential direction, extend between the plate parts 10 and 11 and are inserted into and supported by shaft holes 20 and 21 of the plate parts. A pinion gear 14 is supported via 13. The carrier beam 17 is provided between the pinion gears supported by each pinion shaft 12 and the pinion gears.

Thrust washers 15 are inserted between both end faces of the pinion gear 14 and the plate portions 10 and 11 of the carrier, respectively. The pinion gear 14 meshes with the sun gear 2 and the ring gear 3, the pinion gear 14 rotates on the pinion shaft 12, and the carrier supporting the pinion gear 14 is a sun gear via a boss 28 connected to the plate portion 11. The main shaft 1 supporting 2 is rotatable about its rotation center S 1.

The carrier beam 17 has a hollow fan-shaped cross section so as to fill the space between the pinion gears 14, and the inner surface facing the sun gear 2 has a cross section centered on the rotation center S. The oil trap 19 is formed by the recess having the arc-shaped bottom wall 18. A guide groove 22 is formed on the inner diameter end surface of the plate portion 10 over the entire circumference in the circumferential direction. The guide groove 22 is closer to the inner diameter side of the pinion shaft 12, that is, closer to the rotation center S. The bottom wall 18 of the recess of the oil trap 19 is at least the same as the guide groove 22 or near the center of rotation, and is connected to the guide groove 22 at the axial end of the oil trap 19 itself.

In the plate portion 10, a communication groove 23 extending from the guide groove 22 in the outer diameter direction to the shaft hole 20 is further formed on the surface on the pinion gear 14 side. The communication groove 23 widens toward the guide groove 22 from the shaft hole 20 side. A passage 25 is formed in the pinion shaft 12 in the axial direction, and at the approximate center position of the width of the pinion gear 14 supported by the pinion shaft 12 via the bearing needle 13, an outer peripheral surface 12a and a passage 25 are formed. A tie hole 26 is provided. Further, an introduction hole 24 is provided at a position corresponding to the communication groove 23 of the axial plate portion 10 of the pinion shaft 12.

Since the present embodiment is configured as described above, the oil scattered from the sun gear 2 and the like is captured and stored in the oil capturing portion 19 of the carrier beam 17 during carrier rotation. This oil is guided through the guide groove 22 of the plate portion 10 from the communication groove 23 to the introduction hole 24 of the pinion shaft 12 and to the passage 25, and is supplied from the hole 26 to the bearing needle 13 of the rotating portion.

At this time, since the oil capturing portion 19 is formed in the carrier beam 17 that fills the space between the pinion gears 14, a large amount of oil can be effectively captured with a large area. The oil trap 19 is located on the innermost side near the center of rotation S, and the trapped oil is guided to the bearing needle 13 sequentially through the path extending in the outer diameter direction. Without this, a sufficient amount of oil is smoothly supplied to the rotating surface of the pinion shaft 12. Further, as for the lubrication of the tooth surface of the pinion gear 14, proper lubrication is ensured because the oil directly splashes from the sun gear between the carrier beams 17 and faces the sun gear 2.

It should be noted that, although the plate portions 10 and 11 and the carrier beam 17 are integrally formed as a carrier in the embodiment, they may be formed by assembling individual parts. Further, in the above-described embodiment, the cross section of the recess bottom wall 18 forming the oil catching portion 19 of the carrier beam 17 has an arc shape centered on the rotation center S, but the invention is not limited to this, and the oil catching portion is not limited thereto. The shape can be variously modified.

That is, FIG. 4 shows a part of the modified example, and FIG. 4A shows a recess having a bottom wall 18 ′ having a V-shaped cross section. Further, in (b), the bottom wall 18 ″ of the recess is provided so as to be inclined in the rotation direction, and the tail side in the rotation direction, which frequently occurs in the normal operation of the carrier, is deepest. The advantage is that the scattered oil can be captured more efficiently during normal operation.In addition, in the case shown in (c), the bottom wall 18 ″ of the recess is provided so as to be inclined in the axial direction, The side connected to the guide groove 22 is deepest, that is, has a large diameter. According to this, the effect that the flow of the oil trapped in the oil trap to the guide groove is further accelerated by the centrifugal force is obtained.

[0017]

[Effect of device]

 As described above, according to the present invention, the oil trapping portion having the bottom wall located on the inner diameter side of the pinion shaft is formed on the inner peripheral surface of the carrier beam, and the plate of the carrier has a ring-like shape for connecting the oil trapping portion. Since the guide groove and the communication groove that connects this guide groove and the shaft hole where the pinion shaft is inserted are provided, a wide area can be used for capturing the scattered oil up to the entire width of the pinion gear between the plates. , It is possible to take in a sufficient amount of oil for lubrication. Then, the trapped oil is smoothly guided from the oil trapping portion to the shaft hole along the action direction of the centrifugal force, and is supplied to the pinion shaft. This eliminates the need for a complicated internal oil passage for the carrier member, etc. and requires a simple groove in the plate to supply sufficient oil to the pinion shaft, and prevent seizure from occurring. There is an effect that is done.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a perspective view showing a connecting portion between an oil capturing portion and a guide groove.

FIG. 4 is a diagram showing a modified example of an oil capturing section.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

 1 main shaft 2 sun gear 3 ring gear 10, 11 plate part 12 pinion shaft 12a outer peripheral surface 13 bearing needle 14 pinion gear 15 thrust washer 17 carrier beam 18, 18 ', 18 ", 18"' bottom wall 19 oil trapping part 20, 21 Shaft hole 22 Guide groove 23 Communication groove 24 Introduction hole 25 Passage 26 Hole 28 Boss

Claims (1)

[Scope of utility model registration request] 1. A lubrication device for a planetary gear system in which a pinion shaft is supported between plates connected by a carrier beam, and a pinion gear supported by the pinion shaft is provided in a meshed state between a sun gear and a ring gear. The inner peripheral surface of the carrier beam is formed with an oil capturing portion having a bottom wall located on the inner diameter side of the pinion shaft, and the plate has a ring-shaped guide groove to which the oil capturing portion is connected. And a communication groove that connects the guide groove and a shaft hole into which the pinion shaft is inserted, the lubricating device for a planetary gear device.