JPH0536124U - Thrust bearing structure of planetary gear in automatic transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent seizure of the thrust bearing that supports the planetary gears in the thrust direction with respect to the carrier. [Structure] The thrust bearing 12 interposed between the planetary gear 8 and the carrier 4 has a structure in which washer 12c made of phosphor blue steel is sandwiched between washers 12a and 12b made of steel, and relative rotation between the washers is performed. Reduced speed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thrust bearing structure for a planetary gear in an automatic transmission of a vehicle.

[0002]

[Prior Art]

 The planetary gears that compose the planetary gear mechanism in an automatic transmission of a vehicle are supported by a pinion shaft held by a carrier via a needle bearing and by a thrust bearing interposed between the pinion shaft and the carrier. Lubricating oil is supplied to the bearing.

As the thrust bearing, two steel washers have been used.

[0004]

[Problems to be solved by the device]

 However, due to the increase in the relative rotation between the carrier and the planetary gears due to the higher output and higher speed of the vehicle, there is a risk of seizure between the washers.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has a structure in which a pinion shaft held by a carrier is provided with a planetary gear rotatably via a bearing, and a thrust bearing is provided between the planetary gear and the carrier. The thrust bearing is constructed by interposing a washer made of a bearing material between steel washers.

[0006]

[Action]

 In the thrust bearing structure having the above configuration, the washer made of the bearing material idles to reduce relative rotation and prevent seizure.

[0007]

【Example】

 FIG. 1 shows a cross section of a thrust bearing structure according to an embodiment of the present invention, and FIG. 2 shows a cross section of a planetary gear unit in an automatic transmission of a vehicle.

In FIG. 2, 1 and 2 are sun gears, 3 and 4 are carrier, and pinion shafts 5 and 6 are supported, and planetary gears (pinion gears) 7 and 8 are needle bearing 9 on each pinion shaft 5 and 6. It is rotatably supported via 10. Both ends of the planetary gears 7, 8 are supported by the thrust bearings 11, 12 on the carriers 3, 4 in the thrust direction. The planetary gears 7 and 8 mesh with the internal gears (annulus gears) 13 and 14.

An oil hole 15 is formed in the center of the pinion shaft 5. The oil hole 15 is connected to a branch oil hole 16 formed in the pinion shaft 5 in the radial direction thereof and opening inside the thrust bearing 11 and a branch oil hole 17 opening inside the needle bearing 9.

An annular oil guide 18 is attached to the end surface of the carrier 3 so as to cover the input portion of the oil hole 15. The splashed lubricating oil is received by the oil guide 18, enters the oil hole 15 through the oil guide 18, and is supplied to the thrust bearing portion and the needle bearing portion through the branch oil holes 16 and 17.

A similar configuration is adopted for the pinion shaft 6 of the other planetary gear mechanism. That is, an oil hole 19 is formed in the center of the pinion shaft 6, and the oil holes 19 are connected with branch oil holes 20, 21, 22 that open inside the need bearing 10 and the thrust bearing 12, respectively. An oil guide 23 is attached to the end surface of No. 4 so as to surround the inlet of the oil hole 19.

As shown in FIG. 1, the thrust bearing 12 provided between the planetary gear 8 and the carrier 4 includes a phosphor blue steel washer 12c between two steel washers 12a and 12b. It is composed by sandwiching. The washers 12a and 12b are made of, for example, SK steel, high carbon hardened steel, and a phosphate coating. Further, as the washer 12c, another bearing material may be used. The washers 12a, 12b, 12c are rotatable.

The thrust bearing 11 provided between the planetary gear 7 and the carrier 3 has the same structure.

It should be noted that the thrust bearing on the side on which a large thrust force is not applied may be a conventional two-piece set.

In the thrust bearing structure described above, the thrust bearings 11 and 12 between the planetary gears 7 and 8 and the carriers 3 and 4 have a three-layer structure with a phosphor bronze washer 12c sandwiched between them. The relative rotation speed among the 12a, 12b, and 12c decreases, and seizure does not occur.

In the above-described embodiment, the three-piece structure in which the washer 12c made of the bearing material is sandwiched between the two washers 12a and 12b made of SK steel is used. However, the number of washers made of the bearing material is increased to 5 It is also possible to use a single-sheet structure or another odd-numbered-sheet structure.

[0017]

[Effect of the device]

 According to the thrust bearing structure of the present invention, the thrust bearing interposed between the planetary gear and the carrier has a structure in which a washer made of a bearing material is sandwiched between the thrust bearing structure. It also reduces seizure and prevents seizure even at high speeds.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view of a planetary gear mechanism unit.

[Explanation of symbols]

 3,4 Carrier 5,6 Pinion shaft 7,8 Planetary gear 9,10 Needle bearing 11,12 Thrust bearing 12a, 12b Steel washer 12c Phosphor bronze washer

Claims (1)

[Scope of utility model registration request] 1. A structure in which a planetary gear is rotatably provided on a pinion shaft held by a carrier via a bearing, and a thrust bearing is provided between the planetary gear and the carrier, wherein the thrust bearing is a steel washer. A thrust bearing structure for a planetary gear in an automatic transmission, comprising a washer made of a bearing material interposed between the two.