JPH0239073Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to the prevention of incorrect assembly due to bearings falling off when assembling automatic transmissions, and is generally used in automatic transmissions of automobiles. be done.

(Prior Art) As a prior art related to the present invention, there is one shown in FIG. 3. This includes an input shaft 11 connected to an engine (not shown) via a torque converter,
An output shaft 12 arranged concentrically with the input shaft 11, and a gear flange 1 integrally mounted on the output shaft 12.
3. A ring gear 14 that is integrally attached to the outer periphery of the gear flange 13, a carrier 15 that is integrally molded with the input shaft 11, and a planetary gear 17 that is rotatably attached to the carrier 15 and meshes with the ring gear 14 on one side and the sun gear on the other side. , a transmission consisting of a carrier 15, a gear flange 13, and a thrust needle bearing 18 (double-dashed line) disposed between opposing surfaces.

(Problem to be solved by the invention) However, in this prior art, the input shaft 11
When assembling the side and the output shaft 12 side, the needle bearing 18 came off from the input shaft 11, and the third
As shown in the results shown in the figure, there is a risk that the needle bearing 18 may be positioned eccentrically, and even if it is assembled in this state, the needle bearing 18 will fit into the space between the gear flange 13 and the carrier 15, so there is a problem that you will not notice that it has fallen off. It was hot.

The technical object of the present invention is to solve this problem and to prevent the needle bearing from being reassembled if it falls off.

[Structure of the idea]

(Means for solving the problem) The technical measures taken to achieve the above technical problem are as follows: R-2A+2W>B>R-2A However, A: Needle bearing outer diameter The protrusion is provided at position B, where B: Diameter of the protrusion R: Inner diameter of the ring gear W: Width of the needle bearing.

(Function) With the above means, when the needle bearing falls off during assembly, the protrusion hits the side surface of the needle bearing, the axial space becomes larger than the bearing thickness t, and the input shaft side and output shaft side are reliably assembled. It turns out that there isn't.

(Example) The present invention will be explained below based on examples.

In FIG. 1, the same reference numerals as in FIG. 3 indicate the same functions as in the prior art. Figure 3 is carrier 1
Only 5' is different. The carrier 15' is provided with a projection 15a on a surface facing the gear flange 13. The radial position of the protrusion 15a is R-2A+
It is represented by B, where 2W>B>R-2A. Here A
is the outer diameter of the needle bearing 18, B is the protrusion 1
The tip diameter of 5a and R are the inner diameter of the ring gear 14. The axial height h of the protrusion 15a is made slightly smaller than the thickness t of the needle bearing 18. Due to this incorrect assembly prevention device, if an attempt is made to assemble the input shaft 11 side and the output shaft 12 side with the needle bearing 18 falling off as shown in FIG.
contacts the side of the needle bearing 18 and does not move further in the axial direction, so the gear flange 1
The axial space between the opposing surfaces of the carrier 15' and the carrier 15' is h+t. This shows that the input shaft 11 side and the output shaft 12 side are not reliably assembled.

〔Effect of the invention〕

As a device to prevent incorrect assembly, a protrusion is provided at a predetermined position on the carrier. When the needle bearing falls off, the protrusion and the needle bearing come into contact with each other, and depending on the axial length, the input shaft side and the output shaft are separated. It is easy to see that the shaft side cannot be assembled. Therefore, incorrect assembly will not occur.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main part of the present invention, FIG. 2 is a sectional view showing the operating state of the incorrect assembly prevention device of the present invention, and FIG. 3 is a sectional view of the prior art. 11...Input shaft, 12...Output shaft, 13...Gear flange, 14...Ring gear, 15, 15'
...Carrier, 15a...Protrusion, 18...Needle bearing.

Claims (1)

[Claims for Utility Model Registration] An input shaft connected to the engine via a torque converter, an output shaft arranged concentrically with the input shaft,
a gear flange integrally mounted on the output shaft; a ring gear integrally mounted on the outer periphery of the gear flange; a planet facing the gear flange in the axial direction and integrally mounted on the input shaft; In an automatic transmission comprising a carrier in which a gear is interposed, and a needle bearing disposed between the carrier and the gear flange and having an inner diameter supported by the input shaft, on a surface of the carrier facing the gear flange, R-2A+2W>B>R-2A However, A: Needle bearing outer diameter B: Protrusion diameter R: Ring gear inner diameter W: Needle bearing diameter width A device for preventing incorrect assembly of an automatic transmission is provided with a protrusion at position B.