JPH0567826B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an extension case that is a die-cast molded product that is connected to a transmission case for a vehicle, and specifically relates to an extension case that has a lubricating oil circulation passage integrally formed therein.

[Conventional technology]

In general, when using the die-casting method, there is less wasted material in the product than when using the gravity casting method.
It is superior in that it can be made smaller and lighter. Therefore, it has been proposed that the extension case connected to the transmission case be a die-cast molded product. (Refer to Japanese Patent Application Laid-open No. 141458/1983). Here, the extension case has a cylindrical shape with a large opening end connected to the transmission case and a small opening end through which the output shaft is inserted. A bearing support is formed. When the bearing support section is arranged at the small opening end and the intermediate part in the case in front of it, lubricating oil is supplied from the large opening end to the small opening end side and then again to the large opening end side. It is also necessary to form a circulation path for the lubricating oil to return to.

[Problem to be solved by the invention]

By the way, the extension case formed by die-casting has limitations on its internal shape due to the need for die-cutting, and it has been difficult to mold each bearing support portion and the lubricating oil circulation passage. Conventionally, this problem has been solved by constructing a separate bearing support section located in the middle of the case, and then press-fitting and caulking it into the extension case where the lubricating oil circulation passage is formed. and
There was a problem that the manufacturing process became complicated. The present invention has been made in view of the problems of the prior art, and improves the manufacturing process by making it possible to integrally mold the lubricating oil circulation passage with each bearing support part including the bearing support part located in the middle part of the case. The purpose of the present invention is to provide a simplified extension case for a die-cast molded product.

[Means to solve the problem]

For this purpose, the present invention has a large opening end connected to the transmission case, a small opening end through which the output shaft is inserted, and a bearing for the input shaft located at the lower part of the large opening end. a first bearing support part for supporting a bearing, a second bearing support part for supporting a bearing of a member connected to the output shaft within the small opening end;
a third bearing that is located at an intermediate portion in the longitudinal direction between the bearing support part and the second bearing support part, has a larger diameter than the second bearing support part, is concentric with the second bearing support part, and supports the bearing of the output shaft; The extension case is a die-cast molded product having a support part, which extends substantially horizontally to the large opening end side continuously from the outer peripheral surface of the third bearing support part, and the upper surface thereof serves as a lubricating oil supply passage. a rib on the inner wall of the case; and a refueling guide rib that protrudes substantially horizontally from the inner wall surface of the cavity between the third bearing support section and the second bearing support section at substantially the same height as the rib; , a refueling guide groove that extends axially on the inner peripheral surface of the second bearing support part and opens near the upper surface of the refueling guide rib; a lubricating oil drainage passageway that obliquely descends from a position below the outer peripheral surface of the third bearing support part toward the inner peripheral side of the first bearing support part; A communication hole that penetrates the case side wall and has an inner end opening above the refueling guide rib, and a communication hole that intersects with the discharge passage, penetrates the case side wall, and has an inner end that opens at the bottom of the cavity are integrally formed. I use that as a means.

[Effect]

According to the present invention which employs such a means, lubricating oil is supplied from the large opening end to the small opening end side through the first communication hole, the oiling guide rib, and the oiling guide groove from the supply passage formed by the ribs on the inner wall of the case. A circulation passage for lubricating oil is formed to supply the lubricating oil and return the lubricating oil to the large opening end side via the oil drain guide groove, the cavity, the first communication hole, and the discharge passage.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the accompanying drawings. 1 and 2, reference numeral 1 indicates an aluminum die-cast extension case whose large opening end is connected to the transmission case 2, and the opposite end of the extension case 1 is connected to the output shaft. The end of No. 3 is a small opening end into which the end is inserted. At the lower part of the large opening end of the extension case 1, there is a first bearing for rotatably supporting the end of the transfer drive shaft as the input shaft 8.
The bearing support part 9 is opened, and the second bearing support part 4 for a bearing, which rotatably supports a sleeve yoke on the propeller shaft side (not shown) which is spline-fitted to the output shaft 3 within the small opening end, is opened. ing. Further, a third bearing support part 5 for a bearing is located at an intermediate part in the longitudinal direction between the first bearing support part 9 and the second bearing support part 4 and rotatably supports the intermediate part of the output shaft 3. is open. The third bearing support part 5 is concentric with the second bearing support part 4 and has a larger diameter than the second bearing support part 4. A cavity 6 is open and has an inner diameter between 1 and 2, and the inner diameter gradually decreases from the large opening end to the small opening end. Here, a rib 11 is provided on the inner side wall of the case and protrudes from the outer circumferential surface of the third bearing support portion 5 on one side in the left-right direction and extends substantially horizontally toward the large opening end. The supply passage 12 receives the lubricating oil scattered from the transfer gear 23 and sends it to the outer peripheral surface side of the third bearing support part 5 on one side in the left-right direction. A refueling guide rib 7 is provided on the inner wall surface of the cavity 6 to protrude substantially horizontally at a position closer to the rib 11 side and at substantially the same height as the rib 11 side. As shown in FIGS. 3 and 4, one end of the oil supply guide groove 17 opens near the upper surface of the oil supply guide rib 7, and the other end opens facing the oil seal 24 attached to the small opening end. extends substantially horizontally in the axial direction on the inner circumferential surface of the second bearing support portion 4 . Further, on the inner circumferential surface of the second bearing support portion 4, there is an oil drain guide groove 18 located at the bottom thereof and extending in the axial direction.
is formed so that one end thereof is opened at the lower part of the cavity 6, and the other end thereof is opened facing the oil seal 24. Here, a bush 19 is fitted and mounted on the inner circumferential surface of the second bearing support portion 4, and the bush 19 has an oil supply hole 20 communicating with the oil supply guide groove 17 and an oil drain hole 20 that communicates with the oil supply guide groove 17. An oil drain hole 21 communicating with the guide groove 18 is drilled, and an oil supply hole 20
For example, an X-shaped oil supply diffusion groove 22 is formed on the inner circumferential surface, communicating the oil drain hole 21 with the oil drain hole 21 . Furthermore, a third
A lubricating oil discharge passage 10 is integrally formed using a slide core or the like, passing through a position below the outer peripheral surface of the bearing support part 5 and diagonally descending toward the inner peripheral side of the first bearing support part 9. On the other hand, a first communication hole 13 intersects with the supply passage 12, penetrates the case side wall, and has an inner end opening above the refueling guide rib 7; A second communication hole 15 whose end opens at the bottom of the cavity 6 is integrally formed by casting or other means, and these outer ends are closed with blind plugs 14 and 16, respectively. In such a configuration, lubricating oil is supplied to the extension case 1 along with the first bearing support part 9 in the large opening end, the second bearing support part 4 in the small opening end, and the third bearing support part 5 in the middle part. A circulation passage is constructed. That is, from the supply passage 12 formed by the rib 11 on the inner wall of the case to the first communication hole 13, the oil supply guide rib 7,
The lubricating oil is guided from the large opening end to the oil seal 24 portion on the small opening end side through the oiling guide groove 17, and further from the oiling guide groove 17 to the inner circumference of the bush 19 via the oiling hole 20 and oiling diffusion groove 22. Guide the lubricating oil to the surface and drain excess lubricating oil through the oil drain guide groove 18,
A circulation path for lubricating oil that returns to the inner periphery of the first bearing support portion 9 on the large opening end side via the cavity 6, the first communication hole 15, and the discharge path 10 is configured. Therefore, the lubricating oil accumulated at the bottom of the extension case 1 and scattered from the transfer gear on the transfer drive shaft and the transfer gear 23 on the output shaft 3 is transferred to the inner circumferential surface of the second bearing support portion 4. Also, the bearings supported there can be sufficiently lubricated, and excess lubricating oil can be returned to the large opening end side without wasting it.

【Effect of the invention】

As explained above, according to the present invention, in addition to each bearing support part including the bearing support part located in the middle part of the case, the supply passage formed by the ribs on the inner wall of the case passes through the first communication hole, the oil supply guide rib, and the oil supply guide groove. lubricating oil is supplied from the large opening end to the small opening end, and the lubricating oil is returned to the large opening end via the oil drain guide groove, the cavity, the first communication hole, and the discharge passage. The circulation passage is integrally formed by die-casting. Therefore, it is possible to simplify the manufacturing process of a die-cast extension case that is small and lightweight and has excellent internal lubricity.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention;
FIG. 2 is a longitudinal sectional side view of the main part of one embodiment, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG. 4 is a B--
It is a sectional view taken along the B line. 1... Extension case, 2... Transmission case, 3... Output shaft, 4... Second
Bearing support part, 5... Third bearing support part, 6... Cavity part, 7... Oil supply guide rib, 8... Input shaft, 9...
...First bearing support part, 10... Discharge passage, 11...
rib, 12... supply passage, 13... first communication hole,
14... Blind plug, 15... Second communication hole, 16... Blind plug, 17... Oil supply guide groove, 18... Oil drain guide groove, 19... Bush, 20... Oil supply hole, 21...
...Oil drain hole, 22...Oil supply diffusion groove, 23...Transfer gear, 24...Oil seal.

Claims (1)

[Claims] 1. A large opening end connected to the transmission case 2, a small opening end through which the output shaft 3 is inserted, and an input shaft 8 located at the lower part of the large opening end.
a first bearing support part 9 that supports a bearing of a member connected to the output shaft 3 within the small opening end; a second bearing support part 4 that supports a bearing of a member connected to the output shaft 3 within the small opening end; a third bearing support part 5 that is located at an intermediate part in the longitudinal direction between the bearing support part 4, has a larger diameter than the second bearing support part 4, is concentric with the second bearing support part 4, and supports the bearing of the output shaft 3; The extension case 1 is a die-cast molded product, and extends substantially horizontally to the large opening end side continuously from the outer circumferential surface of the third bearing support portion 5, and the upper surface thereof is connected to the lubricating oil supply passage 12. a rib 11 on the inner wall of the case, and a cavity 6 between the third bearing support part 5 and the second bearing support part 4 at substantially the same height position as the rib 11.
a refueling guide rib 7 that protrudes substantially horizontally from the inner wall surface of the second bearing support portion 4; An oil drain guide groove 18 extends axially on the inner circumferential surface of the bearing support part 4 and opens at the bottom of the cavity 6, and a drain oil guide groove 18 extends axially on the inner circumferential surface of the bearing support part 4 and opens at the lower part of the hollow part 6. a lubricating oil discharge passage 10 that obliquely descends toward the inner circumferential side; a first communication hole 13 that intersects with the supply passage 12 and penetrates the case side wall, and whose inner end opens above the oil supply guide rib 7; An extension case characterized in that a second communication hole 15 is integrally formed, intersecting with the discharge passage 10, penetrating the case side wall, and having an inner end opening at the bottom of the cavity 6.