JPS6314130Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to an air bleed device for a horizontal transmission installed in a vehicle such as an automobile.

[Conventional technology and problems]

Regarding this type of air bleed device, there is a prior art known as, for example, Japanese Utility Model Application Publication No. 55-73419, in which it has been proposed to provide a labyrinth and a separation chamber by using a gasket at the mating portion of the case. However, for example, when a small-capacity rear case is attached to the main transmission case, such as in a horizontally mounted transmission, and the wall thickness of the joint between the two cases is thin, it is not possible to use the measures as in the prior art. Difficult to use. Furthermore, in the prior art described above, oil is not returned from the separation chamber, so in order to prevent oil from blowing out from the air breather, it is necessary to increase the volume of the separation chamber.
Not desirable in terms of space. Furthermore, in order to improve the effectiveness of preventing oil blowing from the air breather, it is desirable to construct a labyrinth as long and complex as possible. The configuration of the breather device shown in Japanese Utility Model Application No. 56-10538 has a problem in that oil accumulated in the separation chamber blows out, and the air breather shown in Japanese Utility Model Application Publication No. 54-58552 only releases air to the outside. It is intended to cause the flow of water to In view of these circumstances, it is an object of the present invention to provide an air bleed device for a transmission that can accurately bleed air even in thin case mating parts without causing oil to blow outward. .

[Means to solve the problem]

For this purpose, the present invention has a bearing disposed on a wall formed on the rear case side mating part of the main transmission case, and a thrust plate that receives the thrust load acting on the bearing. A first passage, a separation chamber communicating with the first passage, and a second passage communicating with the separation chamber are provided in the wall portion covered by the thrust plate,
A maze is formed by forming communication from the bottom to the top, forming a third passage communicating with the second passage in a substantially horizontal direction, and forming a fourth passage rising upward from the third passage. , a lower end of the first passage communicates with the rear case, an oil return hole is formed at the bottom of the separation chamber that communicates with the main transmission case, and the labyrinth is covered by the thrust plate. It is configured as follows.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. Referring to FIG. 1, a transmission system including a transverse transmission to which the present invention is applied will be explained. A crankshaft 1 from an engine is connected to a final reduction gear which is disposed perpendicularly to the clutch side via a clutch 2 and a transmission 3. The device 4 is configured for transmission. The clutch 2 is provided with a clutch housing 5 that includes most of the transmission 3 and the final reduction gear 4.
is housed in a main transmission case 6, and a portion of the transmission 3 is housed in a rear case 7. The transmission 3 is of a constant mesh type and has 5 forward speeds and 1 reverse speed with an overdrive, and has an input shaft 8 from the clutch 2 and an output shaft 9 arranged parallel to it. The output shafts 8 and 9 are connected from the clutch side to the first speed drive and driven gears 10 and 10', the second speed drive and driven gears 11 and 11', the third speed drive and driven gears 12 and 12', and the fourth speed drive and driven gears 10 and 10'. A speed drive and driven gears 13, 13' are sequentially provided.
Here, in the input shaft 8, each drive gear 10
1 to 13 are integrally formed, and on the output shaft 9, each driven gear 10' to 13' is rotatably fitted to the output shaft 9.
3 are always in mesh with each other, and between the driven gears 10' and 11', 12' and 13' of the output shaft 9, there is a synchronizing mechanism 14 for the first and second speeds, and a synchronizing mechanism 15 for the third and fourth speeds. and is provided. In addition, the input shaft 8 and the sleeve 14 of the synchronization mechanism 14
a reverse speed drive and driven gear 16;
16' is integrally formed, and an idler gear 18, which is movably and rotatably fitted to the intermediate shaft 17, meshes with both gears 16, 16'. Furthermore, a fifth speed drive and driven gears 19, 19' are connected to the input and output shafts 8, 9 in the rear case 7.
is provided in the same manner as the above-described transmission gear, and a fifth speed synchronization mechanism 20 is provided adjacent to the driven gear 19' of the output shaft 9. In this way, by shifting the sleeves 14a, 15a, 20a of each synchronizing mechanism 14, 15, 20 and selectively integrally coupling any one of the driven gears 10' to 13' and 19' to the output shaft 9, 1st to 5th speeds are obtained. Further, by moving the idler gear 18 and meshing it with the gears 16 and 16', a reversed reverse speed is obtained. The final reduction gear 4 is configured such that a large-diameter final gear 21' meshes with a drive gear 21 integrally formed on the clutch side of the output shaft 9 for final reduction, and this final gear 21' is connected to a differential mechanism 22.
Transmission is configured to the axles 23 and 24 of the left and right wheels via. Therefore, in the transmission 3 having the above configuration, furthermore, in the inner wall portion 6b of the rear case side mating portion 6a of the main transmission case 6, the input and output shafts 8, 9 are partially connected to the bearing 2.
A thrust plate 27 is supported by bolts 28 in a cantilevered manner and receives the thrust load of the input shaft 8 on the rear case side of the wall 6b. For this reason, an air bleed device is provided between the rear case side mating portion 6a and wall portion 6b of the main transmission case 6 and the thrust plate 27, and this will be explained with reference to FIGS. 2 to 4. First, a hole 30 into which the air breather 29 is inserted is vertically bored at a high point in the case mating part 6a, and the lower end of this hole 30 is hidden by the thrust plate 27 in the wall part 6b, and extends downward with a step. An inclined passageway 31 communicates with a separation chamber 32, which further extends downwardly through a passageway 33.
An oil return hole 34 is provided in the lower part of the separation chamber 32 to communicate with the main transmission case. Here, the passages 31 and 33 and the separation chamber 32 are formed to be open to the thrust plate side, so that when the thrust plate 27 is assembled, the passages 31 and 33 and the separation chamber 32
Only the lower end of 3 communicates with the rear case 7 side and extends to the air breather 29, forming a long and complicated maze 35. With the above configuration, when the internal pressure of the main transmission case 6 and rear case 7, which are in communication with each other, becomes high, oil containing air flows from the lower part of the passage 33 into the separation chamber 3.
The oil flows into the main transmission case 6 through the oil return hole 34, where it expands and is separated into gas and liquid. On the other hand, the air further ascends through the passage 31, but the oil contained in the air is separated by the steps and bends in the passage 31, and only the air escapes to the outside through the air breather 29 in the hole 30.
In this way, the internal pressure of cases 6 and 7 becomes equal to the outside air.

[Effect of the idea]

As described above, according to the present invention, the air bleed device is provided between the mating part 6a of the main transmission case 6 and the thrust plate 27 attached thereto, so that the mating part with the rear case 7 is thin and has no maze. It can also be applied to cases where configuration is difficult. Forming a maze from the bottom to the top and with the horizontal part,
Since the separation chamber 32 is provided with an oil return hole 34 to immediately return the separated oil, the volume of the separation chamber 32 can be small, which is advantageous in terms of space, and oil separation can be carried out sufficiently. Since a relatively wide area covered by the thrust plate 27 is used on the inner wall 6b of the mating part of the main transmission case 6, the maze 3 is long and complicated.
5, and the effect of preventing oil blowing is improved. Since the passages 31, 33 and the separation chamber 32 of the labyrinth 35 are formed with openings on one side, processing is easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a transmission system including a transmission to which the present invention is applied, Fig. 2 is a perspective view of essential parts showing an embodiment of the device according to the present invention, and Fig. 3 is a plan view of the same. , FIG. 4 is a - sectional view of FIG. 3. 3...Transmission, 6...Main transmission case, 6a...
...Matching part, 6b...Wall part, 7...Rear case, 8
...Input shaft, 27...Thrust plate, 29...
... Air breather, 30 ... Hole, 31, 33 ... Passage, 32 ... Separation chamber, 34 ... Oil return hole, 3
5...Maze.

Claims (1)

[Scope of Claim for Utility Model Registration] A bearing is disposed on a wall formed on the rear case side mating portion of the main transmission case, and a thrust plate is disposed to receive the thrust load acting on the bearing, A first passage, a separation chamber communicating with the first passage, and a second passage communicating with the separation chamber are arranged in the wall portion covered by the thrust plate from below to above. Along with forming a connection,
A third passage communicating with the second passage is formed in a substantially horizontal direction, and a fourth passage rising upward from the third passage is formed to form a maze, and the lower end of the first passage communicates with the rear case, an oil return hole is formed at the bottom of the separation chamber that communicates with the main transmission case, and the labyrinth is covered by the thrust plate. Device.