JPH0723855U - Rear extension bush lubrication structure in automatic transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure that oil can be reliably supplied to the bush 14 from the rear extension 10 of the automatic transmission. [Constitution] The conical tube-shaped rear extension has its large diameter side fixed to the case of the automatic transmission. The rear extension is arranged such that its central axis line is substantially horizontal. A bush is fitted and fixed to the small diameter side inner diameter portion of the rear extension. One end side of the output shaft 16 is rotatably fitted to the inner diameter portion of the bush. As a result, one end of the output shaft is rotatably supported by the rear extension via the bush. A lubricating oil hole 22 is formed in the output shaft. On the output shaft, output gear 20
Is stuck. A lubrication rib 12 is formed at the uppermost position of the inner diameter portion of the rear extension along the inclined surface to reach the bush. The lubricating rib is formed in a shape having a groove 12a in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rear extension bush lubrication structure for an automatic transmission.

[0002]

[Prior art]

 As a bush lubrication structure of the rear extension in the conventional automatic transmission, there is a structure in which the rib for lubrication formed on the inner peripheral side of the rear extension is used (the automatic transmission RE4R01A of Nissan Motor Co., Ltd.). . That is, with the cone-cylindrical rear extension arranged so that the central axis of the cone-shaped rear extension is horizontal, the cone-shaped rear extension extends from the uppermost position of the cone-shaped cylinder inner surface to the vicinity of the bush arranged in the small diameter side inner diameter portion along the inclined surface. It has extended lubricating ribs. The oil from the lubrication required hole in the output shaft is splashed to the upper part of the inner wall surface of the rear extension as the output shaft rotates, and flows down as oil droplets along the lubrication rib and is guided to the bush. . This ensures lubrication between the bush and the output shaft.

[0003]

[Problems to be solved by the device]

 However, the bush lubrication structure of the rear extension in the conventional automatic transmission as described above has a problem that the acceleration / deceleration or turning of the vehicle changes before the oil droplets flowing along the lubrication rib reach the bush. As a result, the bush often falls on the way, and it is not possible to supply an appropriate amount of oil to the bush, which may result in insufficient lubrication between the bush and the output shaft. The present invention aims to solve the above problems.

[0004]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems by making the shape of the lubricating rib that guides the oil into the bush into a shape having a groove that increases the surface area of the portion that contacts the oil. That is, the rear extension bush lubrication structure in the automatic transmission according to the present invention is such that the rear cone (10) having a substantially conical tube shape is automatically arranged with its central axis substantially horizontal and with the large diameter side as a mounting portion. The rear extension (10) is fixed to the transmission, and a bush (14) is provided at the small-diameter end of the rear extension (10). One end of the output shaft (16) is rotatably attached to the bush (14). The lubricating rib (12) is fitted along the inclined surface from the uppermost position of the inner surface of the rear extension (10) to the position near the bush (14), and the lubricating rib (12 12) is characterized in that a groove (12a) in the direction of the rib axis is formed in the lower portion where the oil adhered to this drops as oil drops. There. The reference numerals in parentheses indicate the corresponding members of the embodiment.

[0005]

[Action]

 The lubrication rib formed on the rear extension is shaped so that the surface area of the part that comes into contact with oil is large, so the adhesion force of oil to the lubrication rib is greater than in the past and the lubrication rib It becomes difficult for the oil to fall into oil droplets while it travels through the water. As a result, the amount of oil supplied from the lubricating rib to the bush can be increased more than before.

[0006]

【Example】

 FIG. 1 shows an embodiment of the present invention. The cone-shaped rear extension 10 has its large diameter side fixed to the case of the automatic transmission. The rear extension 10 is arranged such that its central axis line is substantially horizontal. A bush 14 is fitted and fixed to the small diameter side inner diameter portion of the rear extension 10. One end side of the output shaft 16 is rotatably fitted to the inner diameter portion of the bush 14. That is, one end of the output shaft 16 is rotatably supported by the rear extension 10 via the bush 14. A lubricating oil hole 22 is formed in the output shaft 16. An output gear 20 is fixed to the output shaft 16. A lubrication rib 12 is formed at an upper position of the inner diameter portion of the rear extension 10 in the figure so as to reach the bush 14 along the inclined surface. A cross section of the lubricating rib 12 taken along line 2-2 in the drawing is formed in a shape having a groove 12a as shown in FIG. That is, the groove 12a is formed in the axial direction of the sliding rib 12. The groove 12a may be a square groove as shown in FIG. 7A or a triangular groove as shown in FIG. 8B, and further, two partial arcs as shown in vortex (c) are connected. The groove may have a combined shape. In short, the groove 12a is such that the contact surface area of the lubricating rib 12 that comes into contact with the oil droplet 18 adhering to the lower end portion of the lubricating rib 12 is larger than the contact surface area when there is no groove. The groove shape is not particularly limited.

Next, the operation of this embodiment will be described. When the automatic transmission is driven and the output shaft 16 rotates, the output gear 20 integrated with the output shaft 16 also rotates. As a result, the oil that has come out of the lubricating oil hole 22 of the output shaft 16 is transmitted through the output gear 20 and splashed up. A part of the splashed oil adheres to the lubrication rib 12. The adhered oil gradually grows into oil droplets 18, which hang down below the lubricating ribs 12. At this time, the oil droplet 18 penetrates into the groove 12a of the lubricating rib 12 and therefore contacts the lubricating rib 12 over a large contact surface area. The surface tension of the oil drop 18 acts as an adhesive force on the lubricating rib 12, and the larger the contact surface area, the greater the adhesive force. That is, the oil droplet 18 has a larger adhesion force to the lubricating rib 12 than in the conventional case, and flows down along the slope toward the bush 14 in a state where it is hard to drop from the lubricating rib 12. Therefore, even if the vehicle is subjected to vibrations due to acceleration changes during acceleration or deceleration or turning, or vibrations due to road surface changes, oil drops 18 are less likely to drop midway than before, and a predetermined amount of oil is stabilized in the bush 14. Can be supplied. This allows the bush 14 and the output shaft 16 to be sufficiently lubricated.

In the above description of the embodiment, one groove 12a is formed, but the present invention is not limited to this, and a plurality of grooves are formed within a size range where oil droplets can be formed. You may do it.

[0009]

[Effect of device]

 As described above, according to the present invention, it is possible to more reliably supply a predetermined amount of oil to the bush of the rear extension of the automatic transmission than before, and to reliably lubricate between the bush and the output shaft. You can

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view around a rear extension of an automatic transmission.

FIG. 2 is a diagram illustrating a shape of a groove formed in a lubricating rib.

[Explanation of symbols]

 10 Rear Extension 12 Lubrication Rib 12a Groove 14 Bushing 16 Output Shaft 18 Oil Drop 22 Lubricating Oil Hole

Claims (1)

[Scope of utility model registration request] 1. A rear end of a generally cone-shaped cylindrical extension is fixed to an automatic transmission such that the central axis of the rear extension is substantially horizontal and the large diameter side is a mounting portion. Is equipped with a bush, and one end of the output shaft is rotatably fitted to the bush.For lubrication along the inclined surface from the uppermost position of the cylinder surface of the rear extension to the position near the bush. In a rear extension bush lubrication structure in an automatic transmission in which ribs are formed, a groove in the rib axial direction is formed in the lower portion where the oil attached to the lubrication rib hangs as oil droplets. Rear extension bush lubrication structure for automatic transmissions.