JP2000283268A - Breather device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a breather plug commonly for a transmission and a transfer in a breather device for ventilating the interior of the transmission and the transfer with the outside air. SOLUTION: A transaxle 4 and a transfer 5 are integrally connected, and shaft part 25a of a speed reduction drive gear 25 is spline-connected to a spline part 20 of a differential case 7. An intermediate shaft 26 is connected to a side gear 16, and passed through a shaft part 25a of the speed reduction drive gear 25 to be extended to the outside. An internal chamber A of the transaxle 4, an internal chamber B of the transfer 5, and a chamber C for storing a bearing 28 are demarcated by oil seals 22, 33, 34, 35, 36. The internal chamber B of the transfer 5 is ventilated with the chamber C by a pipe 37, further ventilated to the chamber 4 of the transaxle 4 through an oil path formed in a gap between the shaft part 25a of the speed reduction drive gear 25 and the intermediate shaft 26, and ventilated together with the chamber A to the outside air by a breather plug mounted on the transaxle 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device provided in a transmission and a transfer of an automobile or the like to ventilate the inside thereof to the atmosphere.

[0002]

2. Description of the Related Art In a transmission such as a transmission and a transfer of an automobile, lubricating oil is sealed to lubricate and cool internal gears, bearings, and the like. When the pressure rises, the internal pressure rises, and there is a possibility that lubricating oil may leak to the outside from a bearing seal portion or the like. Therefore, in general, a breather plug is attached to the case of such a transmission, and the inside of the case is ventilated to the atmosphere through the breather plug, and the pressure inside the case is released to prevent leakage of lubricating oil. are doing. Further, when the internal pressure is reduced, the air is introduced into the case through the breather plug, and foreign substances are prevented from entering from the outside.

[0003] Generally, in a transmission and a transfer,
Since the required amount of lubricating oil is different and the optimal oil level is also different (usually, the oil level of the transmission is higher than the transfer), the transmission and the transfer must be connected in a four-wheel drive vehicle, etc. Even when the transmission and the transfer are integrally disposed, the inside of the transmission and the transfer are independent chambers, and a breather plug is mounted in each of them. In addition, when the inside of the transmission and the transfer are communicated with each other to share the lubricating oil, a problem arises in that the oil level of the transfer excessively rises and the running resistance increases.

[0004]

In the above-mentioned conventional transmission and the transfer in which a breather plug is attached to each of the transmissions, two breather plugs are required, and the breather plug prevents foreign substances from entering during traveling of the vehicle. Therefore, since it is necessary to arrange the device at a position as high as possible, it is usually mounted on a case of a transmission and a transfer via a long pipe such as a hose, so that it is necessary to increase the number of parts and secure a mounting space. There was a problem.

The present invention has been made in view of the above points, and has as its object to provide a breather device that can share a breather plug with a transmission and a transfer.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a breather device for ventilating the inside of a transmission and a transfer with outside air. A pipe line communicating with the inside of the transfer is provided, and a breather plug is mounted on one of the transmission and the transfer. With this configuration, the inside of the transmission and the inside of the transfer are communicated with each other through the pipeline, and are ventilated to the atmosphere by a breather plug mounted on one of the transmission and the transfer.

According to a second aspect of the present invention, in the first aspect of the present invention, the transmission and the transfer are integrally connected. With this configuration, the transmission and the transfer form one unit.

[0008] The invention of claim 3 provides the above-mentioned claim 1 or 2
Wherein the output shaft of the transmission is inserted through the case of the transfer and extended to the outside, and a chamber having a bearing for supporting the output shaft is formed inside the transfer, and the chamber is formed of the output shaft. , And is communicated with the inside of the transmission via an oil passage formed along the line, and the pipeline communicates the chamber with the inside of the transfer. With such a configuration, the inside of the transfer is communicated with the chamber having the bearing of the output shaft in the transfer through the pipe, and further, the transmission is formed through the oil passage formed along the output shaft. It is communicated inside.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the breather plug is mounted on the transmission.
With such a configuration, the inside of the transfer is communicated with the inside of the transmission through the pipeline, and is ventilated to the atmosphere by the breather plug together with the inside of the transmission.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 3 show a transmission for a four-wheel drive vehicle to which the breather device of the present embodiment is applied. As shown in FIGS. 1 to 3, the transmission 1 integrally includes a transaxle 4 (transmission) in which a gear transmission (not shown) and a differential 3 are incorporated in a case 2 and a transfer 5. It is combined with

The transmission of the transaxle 4 corresponds to a so-called horizontal engine having a crankshaft arranged in the vehicle width direction, and is connected to a crankshaft of the engine (not shown) via a clutch (not shown). An input shaft 6 to be connected, a counter shaft (not shown) arranged parallel to the input shaft 6,
The input shaft 6 includes a plurality of gears (not shown) which are respectively mounted on these shafts and mesh with each other, and a clutch mechanism (not shown) for selectively coupling the plurality of gears to an input shaft and a counter shaft. A plurality of reduction ratios (including a reverse ratio) can be appropriately selected by a combination of the counter shaft and a gear that is clutch-coupled thereto. An output gear (not shown) attached to the counter shaft is a differential case 7 of the differential 3 (described later).
Is engaged with a ring gear 8 (final gear) attached to the gear. In the drawing, reference numeral 9 denotes an engine mounting flange, 10 denotes a gear shift select lever, 11 denotes a clutch release bearing, and 12 denotes a clutch release shaft.

The differential 3 includes a differential case 7 rotatably supported by bearings 13 and 14 on the case 2 of the transaxle 4 and a pair of side gears 15 and 16 having a rotating shaft coaxial with the rotating shaft. A pair of differential pinions 17 and 18 rotatably supported and having a rotation axis perpendicular to the rotation axes of the side gears 15 and 16 and meshing with the saddle gears 15 and 16 are rotatably supported by a differential pinion shaft 19. One end of the differential case 7 is formed in a cylindrical shape, is inserted into the bearing 13 and is opened to the outside of the case 2, through which one front wheel drive shaft (not shown) is inserted and connected to the side gear 15. It is supposed to be. Further, a cylindrical spline portion 20 is formed at the other end of the differential case 7, and the spline portion 20 is inserted into the bearing 14 and extends to the outside of the case 2. In the figure, reference numerals 21 and 22 denote oil seals, 23
Is speed sensoring.

In a case 24 of the transfer 5, a reduction drive gear 25 having a hollow shaft portion 25a spline-connected to the spline portion 20 of the differential case 7 has a bearing 27.
A, 27B. Reduction drive gear 25
Inside, an intermediate shaft 26 (output shaft) is inserted, one end of the intermediate shaft 26 is inserted into the spline portion 20 and connected to the side gear 16, and the other end is inserted into a bearing 28 (bearing). The other front wheel drive shaft (not shown) is connected to the case 24 so as to be rotatable and extended to the outside. In the case 24, a reduction driven gear 29 meshing with the reduction drive gear 25 has a bearing 30.
Therefore, it is supported. A bevel gear 31 is attached to the reduction driven gear 29, a bevel pinion (not shown) is meshed with the bevel gear 31, and a flange joint 32 is connected to a rear end of a shaft extending rearward from the bevel pinion. Then, the flange joint 32 is connected to a differential (not shown) of the rear wheel drive shaft via a propeller shaft (not shown). The reduction driven gear 29, the bevel gear 31, and the bevel pinion accommodated in the case 24 are disposed below the central axis of the reduction drive gear 25. In the drawings, reference numerals 33, 34, 35, and 36 indicate oil seals.

The space between one end of the hollow shaft portion 25a of the reduction drive gear 25 and the case 2 of the transaxle 4 is sealed by an oil seal 22, and the case of the transfer 5
24 is sealed by an oil seal 33, and between the other end of the hollow shaft portion 25a and the case 24 is an oil seal 34,
The seal between the intermediate shaft 26 and the case 24 is sealed by a seal 36, and the oil seals 22, 33, 34, 35, and 36 accommodate the gear mechanism inside the trunk axle 4. A room A for accommodating the gear mechanism inside the transfer 4,
In the case 24, a chamber C between the oil seals 35 and 36 accommodating the bearings 28 is liquid-tightly partitioned.

A differential case 7 is provided between the chamber A inside the transaxle 4 and the chamber C inside the case 24 of the transfer 5.
The gap between the insertion portion between the shaft 26 and the intermediate shaft 26, the gap between the spline portion between the spline portion 20 and the shaft portion 25a of the reduction drive gear 25, and the gap between the shaft portion 25a of the reduction drive gear 25 and the intermediate shaft 26, Are communicated with each other via an oil passage formed along. A substantially U-shaped pipe connected to the upper part of the case 24 between the chambers B and C in the transfer 5
They are communicated with each other by 37 (pipe). Pipe 37
For example, it can be directly press-fitted into the case 24 as a pipe member made of metal or the like, and can be attached via a union 38 pressed into the case as a hose made of rubber or the like as shown in FIG. Can also. A breather plug 40 is attached to the transaxle 4 above the case 2 via a hose 39.

An appropriate amount of lubricating oil is sealed in each of the chamber A inside the transaxle 4 and the chamber B inside the transfer 5, and the oil level of the chamber A is higher than the oil level of the chamber B. It is in. Room C in case 24 of transfer 5
Is connected to the room A of the transaxle 4,
The oil level is the same as the oil level of the chamber A, and the oil levels of the chambers A and C are set so that the ventilation is performed between the chambers A and C.
It is lower than the upper end of the opening of the shaft 25a of the reduction drive gear 25. Further, the pipe 37 is connected to a position sufficiently higher than the oil level of the chamber C so that the lubricating oil in the chamber C does not enter the inside of the pipe 37.

The operation of the embodiment constructed as above will be described below. The transaxle 4 and the transfer 5 supply the lubricating oil sealed in the chambers A, B, and C to a gear mechanism, a bearing, and the like to perform lubrication and cooling of each part. At this time, the chambers A and C on the transaxle 4 side
And the chamber B on the transfer 5 side are independent of each other, and a required amount of lubricating oil is sealed therein, so that appropriate lubrication and cooling can be performed, and a problem such as an excessive increase in running resistance occurs. Nothing.

The chamber B inside the transfer 5 has a pipe 37
And is further ventilated into the chamber C through the
Between the shaft part 25a and the intermediate shaft 26, the differential case 7 and the intermediate shaft
A space inside the transaxle 4 through an oil passage formed along the intermediate shaft 26 by a gap between an insertion portion with the shaft 26 and a gap between a spline connection portion between the spline portion 20 and the shaft portion 25a of the reduction drive gear 25. A is ventilated to A and is ventilated to the atmosphere together with the chamber A by the breather plug 40 mounted on the transaxle 4. Such a short U-shaped pipe
By simply providing the 37, the breather plug 39 can be shared between the transaxle 4 and the transfer 5, and there is no need to provide a separate breather plug, mounting hose, mounting bracket, etc., on the transfer 5, reducing the number of parts and mounting space. can do.

[0019] As a modification of the above embodiment, as shown in FIG. 5, instead of the pipe 37, and a sufficiently high portion than the oil level L ₁ of the lubricating oil inside the chamber B of the transfer case 5, the transaxle 4 by communicating the union 41 and the hose 42 and sufficiently high portion than the oil level L ₂ of the lubricating oil inside the chamber a (may be press-fitted pipe directly by omitting the union 41), the interior of the transfer case 5 Room B with hose 42
To the chamber A inside the transaxle 4 via the air passage, and to the atmosphere together with the chamber A via the breather plug 40. In FIG. 5, the same parts as those in the embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals.

In the above-described embodiment and modified examples, the case where the breather plug is mounted on the transaxle side is described. However, the present invention is not limited to this, and the breather plug can be mounted on the transfer side. In consideration of the height of the oil surface of each lubricating oil, it is preferable to arrange the lubricating oil at a position where foreign matter is unlikely to enter from the outside.

[0021]

As described above in detail, according to the breather device of the first aspect, the inside of the transmission and the transfer are communicated with each other through the pipeline, and the breather mounted on one of the transmission and the transfer. Since the air is ventilated by the plug, the breather plug can be shared by the transmission and the transfer, and the number of parts and the mounting space can be reduced.

According to the breather device of the second aspect, since the transmission and the transfer are integrally connected, they can be made into one unit.

According to the breather device of the third aspect, the inside of the transfer is communicated with the chamber having the bearing of the output shaft in the transfer via the pipe, and further, the oil passage formed along the output shaft. , The inside of the transmission and the transfer can be ventilated to the outside by the shared breather plug.

Further, according to the breather device of claim 4,
The inside of the transfer can be communicated with the inside of the transmission via a pipe line, and can be ventilated to the atmosphere by the breather plug together with the inside of the transmission.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view showing a main part of a transmission according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus of FIG.

FIG. 3 is a side view of the apparatus of FIG. 1;

FIG. 4 is a cross-sectional view showing a modified example of a mounting portion of a conduit of the apparatus of FIG.

FIG. 5 is a schematic diagram showing a modification of the embodiment shown in FIGS. 1 to 3;

[Explanation of symbols]

 4 Transaxle (transmission) 5 Transfer 26 Intermediate shaft (Output shaft) 28 Bearing (Bearing) 37 Pipe (Pipe) 40 Breather plug A, B, C room

Claims (4)

[Claims] 1. A breather device for ventilating the inside of a transmission and a transfer with outside air, wherein a pipe line communicating between the inside of the transmission and the inside of the transfer is provided. A breather device having a breather plug mounted on one side. 2. The transmission and the transfer,
The breather device according to claim 1, wherein the breather device is integrally connected. 3. An output shaft of the transmission is inserted into a case of the transfer and extended to the outside, and a chamber having a bearing for supporting the output shaft is formed inside the transfer, and the chamber includes the output shaft. 3. The communication device according to claim 1, wherein the transmission device communicates with the inside of the transmission via an oil passage formed along an axis, and the conduit communicates the chamber with the inside of the transfer. The breather device according to item 1. 4. The breather device according to claim 1, wherein the breather plug is mounted on the transmission.