JPS627020Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lubricating oil supply structure for a governor gear in an automatic transmission used in vehicles such as automobiles.

2. Description of the Related Art Automatic transmissions used in vehicles such as automobiles have a governor gear pair consisting of a drive governor gear attached to an output shaft for detecting vehicle speed and a driven governor gear meshing with the drive governor gear.

Some front-wheel drive automatic transmissions have an output shaft located below and parallel to the input shaft. A partition wall is provided that divides the inner space into upper and lower parts, and an input shaft is provided above the partition wall, and an output shaft is provided below the partition wall. A governor gear pair is provided below the partition wall to support the frictional engagement element of the frictional engagement device.

The lubricating oil that has finished lubricating each lubricating part flows down to the inner bottom of the transmission case below the bulkhead, but the level of lubricating oil at the bottom changes depending on the oil temperature, and the oil level is high. Sometimes, the lubricating oil accumulated at the bottom of the transmission case is scraped up as the drive governor gear rotates and is supplied to the meshing part between the drive governor gear and the driven governor gear, ensuring good lubrication of the meshing part. However, when the oil level is low, lubricating oil is not supplied to the meshing portion, and the meshing portion is not sufficiently lubricated, resulting in severe wear of the governor gear.

An object of the present invention is to provide a structure for supplying lubricating oil to governor gears so that lubricating oil is always supplied to the meshing portions of a pair of governor gears, and the meshing portions are always well lubricated.

This purpose is to provide automatic transmissions as described above.
An oil hole is perforated through the partition wall at a position corresponding to above the pair of governor gears, and a lubricating oil supply source is provided above the partition wall, and lubricating oil is supplied from this source to the wet friction engagement device. This is achieved by a governor gear lubricating oil supply structure configured to supply lubricating oil to the governor gear pair through the oil hole.

According to this configuration, the lubricating oil supplied from the lubricating oil supply source to the wet friction engagement device is actively guided to the governor gear pair through the oil hole provided in the partition wall. Good lubrication can be achieved only by adding the oil holes.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail by way of example with reference to the accompanying figures below.

Fig. 1 is a partially cutaway side view showing an embodiment of an automatic transmission for a vehicle incorporating a lubricating oil supply structure according to the present invention, and Fig. 2 is an enlarged view taken along the line shown in Fig. 1. FIG. In these figures, reference numeral 1 indicates a transmission case, and reference numeral 3 indicates a cover attached to one end of the transmission case by bolts 2. Inside the transmission case 1, there is a partition wall 4 that divides the space inside the transmission case into two stages, upper and lower.
A planetary gear mechanism and a wet friction engagement device, which are well known per se, are incorporated in the upper part of this bulkhead to achieve the required gear stage. A sun gear 6 mounted on the outer periphery of the hollow shaft 5, a carrier 7, a planetary pinion 8 rotatably supported by the carrier 7, a ring gear 9, brakes 10, 11, one-way clutches 12, 13, and the hollow shaft 5. A ball bearing 14 rotatably supports the transmission case 1 from the transmission case 1. An output shaft 15 is provided below the partition wall 4 in parallel to the hollow shaft 5. The output shaft 15 is rotatably supported from the transmission case 1 by a roller bearing 16, and has a gear 17 at one end. The gear 17 meshes with a gear 18 supported by the hollow shaft 5, and is rotationally driven by the gear 18.

The output shaft 15 carries a drive governor gear 20 made of steel in its intermediate part, ie below the bulkhead 4. A drive governor gear 22, which is generally made of synthetic resin and is integrally molded with the shaft member 21, meshes with the drive governor gear 20 at its upper portion. As clearly shown in FIG. 2, the shaft member 21 is rotatably supported by the transmission case 1 via a cylindrical governor pressure adapter 23, and protrudes outside the transmission case 1 at one end. , has an output gear 24 at its protruding end. The driven governor gear 22 is disposed very close to the lower bottom of the partition wall 4. A brake 10 is provided on the upper surface of the bulkhead 4 in a portion corresponding to the driven governor gear 22.
A spline groove 25 is formed to hold the frictional engagement elements 10a, 11a of 11 and the outer race 13a of the one-way clutch 13 immovably. An oil hole 26 is drilled through it.

Lubricating oil supplied to the hollow portion 5a of the hollow shaft 5 is provided in the meshing portions of the sun gear 6, the planetary pinion 8, and the ring gear 9, the brakes 10, 11, and the one-way clutches 12, 13. The lubricating oil is supplied through the oil holes 27 to 29 as a lubricating oil supply source, and the lubricating oil supplied to each of these parts accumulates on the partition wall 4 after finishing lubrication of each of these parts. The lubricating oil accumulated on this partition wall 4 passes from the spline groove 25 through the oil hole 26 to the driven governor gear 2.
2, and is guided to the meshing portion of the driven governor gear 22 and the drive governor gear 20, and lubricates the meshing portion.

As described above, according to the present invention, the lubricating oil supplied to the planetary gear mechanism and wet friction engagement device located above the governor gear pair across the partition wall passes through the oil hole drilled through the partition wall to the governor gear pair. As a result, the meshing portions of the governor gear pair are always well lubricated.

Although the present invention has been described above in detail with reference to specific embodiments, it is understood that the present invention is not limited to this and that various embodiments are possible within the scope of the present invention. This will be obvious to businesses.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of an automatic transmission for a vehicle incorporating a lubricating oil supply structure according to the present invention, and Fig. 2 is an enlarged sectional view taken along the line - in Fig. 1. be. 1... Transmission case, 2... Bolt, 3... Cover, 4... Bulkhead, 5... Hollow shaft,
6...Sun gear, 7...Carrier, 8...Planetary pinion, 9...Ring gear, 10, 11...
... Brake, 12, 13 ... One-way clutch, 14 ... Ball bearing, 15 ... Output shaft, 16
... Roller bearing, 17, 18 ... Gear, 20 ... Drive governor gear, 21 ... Shaft member, 21 ... Driven governor gear, 23 ... Governor pressure adapter, 24 ... Output shaft gear, 25 ... Spline groove, 26-29 ... Oil hole.

Claims (1)

[Scope of utility model registration request] A partition wall is provided in the transmission case that divides the internal space of the transmission case into two stages, upper and lower. In the automatic transmission, a governor gear lubricating oil supply structure is provided in which a governor gear pair is provided below the partition wall, and an oil hole is bored through the partition wall at a position corresponding to an upper part of the governor gear pair. , Lubricating oil for a governor gear, wherein a lubricating oil supply source is provided above the partition wall, and the lubricating oil supplied from the source to the wet friction engagement device is supplied to the governor gear pair via the oil hole. Supply structure.