JP2975164B2 - Bearing structure of automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure applied to an automatic transmission of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a bearing structure of an automatic transmission,
For example, one described in JP-A-60-84442 is known.

In this bearing structure, an outer periphery of an input shaft is supported on an inner periphery of an output shaft via a bush, an outer periphery of the output shaft is supported on a transmission case via a bearing, and a planetary gear is mounted on the output shaft. The carrier shaft of the apparatus is spline-coupled, and in this case, the spline coupling of the carrier shaft is coupled to the outer periphery of the output shaft.

[0004]

However, in the above-mentioned conventional bearing structure, the carrier shaft is spline-coupled to the outer periphery of the output shaft. And a bearing for supporting the transmission shaft in the transmission case are arranged in parallel in the axial direction on the outer periphery of the output shaft. As a result, it is necessary to increase the length of the output shaft. There was a problem that the machine became long.

An object of the present invention is to provide a bearing structure for an automatic transmission that can reduce the length of an output shaft by focusing on the above problems.

[0006]

According to the present invention, the carrier shaft is spline-coupled to the inner periphery of the output shaft at a position where the outer periphery of the output shaft overlaps a bearing for supporting the transmission case. Solved the problem.

That is, the bearing structure of the automatic transmission according to the present invention comprises:
The outer periphery of the input shaft is supported on the inner periphery of the output shaft via a bush, the outer periphery of the output shaft is supported on the transmission case via a bearing, and the carrier shaft of the planetary gear device is spline-coupled to the output shaft. In the bearing structure of the automatic transmission described above, the carrier shaft portion is spline-coupled to the inner periphery of the output shaft at a position overlapping the bearing.

[0008]

In the bearing structure of the automatic transmission according to the present invention, the carrier shaft is spline-coupled to the inner periphery of the output shaft.
This carrier shaft portion can be arranged at a position overlapping with a bearing for supporting the outer periphery of the output shaft.

Therefore, the length of the output shaft can be reduced by the overlap width between the carrier shaft and the bearing.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view showing a bearing structure of an automatic transmission according to an embodiment, and 1 is an input shaft.

A rotational force is transmitted to the input shaft 1 from an engine output shaft (not shown) via a torque converter. The rotational force of the input shaft 1 is output after being shifted through the planetary gear device 2 and the like. The power is transmitted from the shaft 3 to a final drive device (not shown).

The output shaft 3 is supported on the same axis as the input shaft 1, and one end of the output shaft 3 is supported by a transmission case 4 via a bearing 50, and the other end of the output shaft 3 is integrated with the transmission case 4. Is supported via a needle bearing 51 on the drum support portion 40.

A shaft hole 30 is formed inside the output shaft 3, and the tip of the input shaft 1 is supported on the inner periphery of the shaft hole 30 via a bush 52.

The carrier shaft 23a of the planetary gear set 2 is spline-coupled to the output shaft 3. In this case, a large-diameter hole 31 is formed at the mouth of the shaft hole 30.
A spline groove 32 is formed in the large-diameter hole portion 31, while spline teeth 24 are formed on the outer periphery of the carrier shaft portion 23 a, and the carrier shaft portion 23 a It is spline-coupled to the inner periphery of the output shaft 3 at a position overlapping the needle bearing 51 with a width R. The planetary gear device 2 includes a sun gear 20 formed integrally with the input shaft 1, an internal gear 21 having a disk portion 21a supported on the outer periphery of the output shaft 3, and a sun gear 20 and the internal gear 21. Pinion gear 2 meshing at the same time
The rotation speed of the output shaft 3 with respect to the rotation speed of the input shaft 1 can be changed by fixing or driving each of the three elements with the carrier 23 that supports the output shaft 2.

Next, the operation of the embodiment will be described.

In the bearing structure of this embodiment, the carrier shaft 2
Since carrier 3a is spline-coupled to the inner periphery of output shaft 3, carrier shaft portion 23a can be disposed at a position overlapping needle bearing 51 for supporting the outer periphery of output shaft 3. .

Accordingly, the length of the output shaft 3 can be shortened by the overlap width R between the carrier shaft portion 23a and the needle bearing 51.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this embodiment.

[0019]

As described above, in the bearing structure of the automatic transmission according to the present invention, the carrier shaft is spline-coupled to the inner periphery of the output shaft at a position overlapping the bearing. The effect that the shaft length of the output shaft can be shortened by the overlap width is obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a bearing structure of an automatic transmission according to an embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input shaft 2 Planetary gear set 23a Carrier shaft part 3 Output shaft 4 Transmission case 40 Drum support part 51 Needle bearing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-84442 (JP, A) JP-A-2-129445 (JP, A) JP-A-2-2255881 (JP, A) JP-A-1- 216143 (JP, A) Japanese Utility Model 63-195146 (JP, U) Japanese Utility Model 3-2948 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 57/00-57 / 04 F16H 3/44-3/78

Claims (1)

(57) [Claims] An outer periphery of an input shaft is supported on an inner periphery of an output shaft via a bush, an outer periphery of the output shaft is supported on a transmission case via a bearing, and a carrier of a planetary gear device is mounted on the output shaft. A bearing structure for an automatic transmission in which a shaft portion is spline-coupled, wherein the carrier shaft portion is spline-coupled to an inner periphery of an output shaft at a position overlapping the bearing. Construction.