JPS5822660B2 - Oil seal device between transmission and differential device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil seal device between a transmission and a differential device that are integrally adjacent to each other.

In a transaxle type automatic transmission in which an automatic transmission and a differential device are integrated and adjacent to each other, oils having different characteristics are used in the automatic transmission and the differential device, respectively.

Therefore, when these oils mix with each other, the oil characteristics change, leading to a situation where the function and durability of automatic transmissions and differential devices deteriorate.

For this reason, conventionally a double lip seal is installed between the two oils, but if one seal is damaged, mixing of both oils is unavoidable, and it is difficult to detect lip seal damage early. It is.

An object of the present invention is to provide an oil seal device between a transmission and a differential device that can appropriately suppress oil mixing even when partial seal damage occurs, and that facilitates early detection of seal damage. The goal is to provide the following.

Next, the present invention will be described in detail with reference to the drawings.

The automatic transmission 1 and the differential device 2 are arranged adjacent to each other, and are integrally surrounded by a common transmission housing 3 on the outside in the radial direction.

The oil seal housing 4 is fitted onto the inner circumferential surface of the transmission housing 3 and is disposed axially midway between the automatic transmission 1 and the differential device 2 .

The oil seals 7.8 are attached to the inner peripheral surface of the oil seal housing 4 and are arranged side by side in the axial direction.

The lips 9, 10 of the oil seals 1, 8 are connected to the power transmission shaft 11
Contact the outer periphery of the oil to prevent oil leakage.

The oil seals 1 and 8 are separated by a predetermined dimension in the axial direction, and a leakage space 15 is formed between them.

A discharge passage 16 formed in the oil seal housing 4 is connected to the leakage space 15 at its radially inner end and extends radially outward and downward at a predetermined angle.

Note that a passage 17 formed near the discharge passage 16 is a passage for returning oil in the automatic transmission 1 that has flowed through the groove 18 for the ring.

An annular groove 21 is formed on the outer periphery of the oil seal housing 4 and is connected to the discharge passage 16.

A gasket 22 and an O-ring 23 are provided between the oil seal housing 4 and the transmission housing 3 on both sides of the annular groove 21 in the axial direction. Oil leakage is prevented.

The discharge passage 26 is formed in the transmission housing 3 so as to be inclined with respect to the discharge passage 16 and to extend linearly downward in the vertical direction in the embodiment, and has an annular groove 21 connected at its radially inner end. It communicates with the outside of the transmission housing 3.

Oil attempting to leak through the transmission shaft 11 is blocked by the lips 9, 10 of the oil seal 7.8, and mixing of oil on the automatic transmission side and oil on the differential device side is prevented.

Nevertheless, the oil leaking beyond the lips 9, 10 reaches the leak space 15, and the oil in the leak space 15 is discharged from the discharge passage 16 before reaching the other lip 10, 9, so that the oil has different characteristics. The situation of oil mixing is avoided as much as possible.

Furthermore, even if one of the oil seals 7 or 8 is damaged, a considerable portion of the leaked oil will be discharged through the discharge passage 16 before leaking through the other oil seal 8, 7.
In this case as well, oil mixing is appropriately suppressed.

The leaked oil led through the discharge passage 16 flows into the annular groove 21.
and is discharged to the outside of the transmission housing 3 via the discharge passage 26.

The oil discharged to the outside leaks onto the road surface, so the driver is exposed to oil.

- Damage to the rules 7 and 8 can be detected at an early stage.

The relative slope of the discharge passages 16,26 also prevents water and dirt from entering the leakage space 15 from the outside.

Furthermore, the leakage space 15 is maintained at atmospheric pressure by means of the discharge passage 16.26, which serves to keep the pressure difference on both sides of the oil seal 7.8 small and thus to reduce oil leakage.

As described above, according to the present invention, the oil seals 7.8 are arranged in parallel in the axial direction and form a leakage space 15 of a predetermined size in the axial direction between them, and the leakage space 15 is relatively It is connected to the outside of the transmission housing 3 via an inclined discharge channel 16.26.

In this way, in the case of the present invention, mixing of oils with different properties does not occur unless the oil passes over the two oil seals 7.8, and oil leaking beyond one oil seal 7.8 is absorbed into the other oil seal 8. , 7, the leakage space 15
Since the leakage space 15 is always maintained at atmospheric pressure and the pressure difference on both sides of the oil seal 7.8 is small, oil leakage is greatly suppressed and one oil seal 7 or 8 is damaged. However, the situation of oil mixing is appropriately suppressed.

Furthermore, if the oil seal 7.8 is damaged, the driver can detect it from the outside, which is advantageous for early detection of damage to the oil seal 7.8.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view in the axial direction of an embodiment of the present invention, and FIG. 2 is a partially cutaway view taken from the direction {circle around (2)} in FIG. 1. 1... Automatic transmission, 2... Differential device, 3... Transmission housing, 4...
...Oil seal housing, 7, 8...
Oil seal, 9°10...Lip, 15...
...Leakage space, 16,26...Drainage passage.

Claims (1)

[Claims] 1. In a vehicle in which a transmission and a differential device are arranged adjacent to each other, an outer housing that covers the radially outer side of an intermediate portion between the transmission and the differential device;
an oil seal housing provided radially inward of the outer housing; first and second oil seals that are attached to the inner circumferential surface of the oil seal housing in parallel in the axial direction and have lips that contact the outer circumferential surface of the power transmission shaft; , a leakage space having a predetermined dimension in the axial direction formed between the first and second oil seals, a first discharge hole connected to the leakage space at a radially inner end and passing through the oil seal housing in the radial direction; A second discharge hole is formed in the outer housing so as to be connected to the first discharge hole at the radially inner end and extend outward in the radial direction at an angle with respect to the first discharge hole. An oil seal device between the transmission and differential device.