JPS6212132Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field) This invention relates to a final reduction gear for a vehicle.

(Prior Art) Generally, in a final reduction gear for a vehicle, a pinion gear that is rotationally driven by an engine and a ring gear that meshes with the pinion gear are rotatably supported by a housing via bearings. By being driven and rotated, the lubricating oil stored in the lower part of the housing is scraped up, and this lubricating oil is supplied to the meshing part of the pinion gear and ring gear and the bearing, thereby preventing seizure between the pinion gear and ring gear and damage to the bearing. is prevented.

As a conventional final reduction gear for a vehicle of this type, for example, the one shown in Japanese Utility Model Application Laid-Open No. 55-97258 is known. This fruit was developed in 1972-97258.
The final reduction gear for a vehicle disclosed in the publication has a plurality of holes arranged in the rotation direction of the ring gear,
The lubricating oil stored in the lower part of the housing is sucked into the housing through this hole, used to lubricate the differential gear, and then discharged from this hole by the centrifugal force of the ring gear, and is used to lubricate the pinion gear and ring gear. and the bearings.

However, in such conventional final reduction gears for vehicles, the lubricating oil stored in the lower part of the housing is scraped up only by the ring gear, so the lubricating oil does not reach the meshing parts and bearings. The supply was insufficient, and as a result, there was a risk that the pinion gear and ring gear would seize and the bearing would be damaged.

(Purpose of the invention) This invention was made by focusing on the above-mentioned problem, and is a final product for vehicles that can scrape up a large amount of lubricating oil stored at the bottom of the housing without changing the shape of the housing. The purpose is to provide a speed reducer.

(Structure of the invention) The structure of the invention for achieving this purpose consists of a housing that is fixed to the vehicle body and stores lubricating oil in its lower part, and a drive pinion gear that is rotatably supported by the housing and rotationally driven by the engine. a differential case rotatably supported by the housing and having a flange projecting radially outward with respect to the rotation axis thereof; and a differential case fixed to the flange so as to mesh with the drive pinion gear and be positioned coaxially with the rotation axis A ring gear whose lower part is immersed in the lubricating oil, and a number of projections are provided on the outer periphery of the flange, the tips of which are located on the same circumferential surface as the outer periphery of the ring gear.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

In FIG. 1, reference numeral 10 denotes a housing fixed to the vehicle body, and lubricating oil 11 is stored inside the housing 10 on the lower side. Housing 10
A sub-housing 12 is provided on the inside front side. A drive shaft 13 is housed in the sub-housing 12 so as to extend in the front-rear direction, and the drive pinion 13 is rotatably supported by the sub-housing 12 via a front bearing 14 and a rear bearing 15. There is. A drive pinion gear 16 is attached to the drive pinion 13 that protrudes rearward from the rear bearing 15.
is formed. A companion flange 17 is screwed into the drive pinion 13 that projects forward from the front bearing 14, and this companion flange 17 is connected to the bearing 14.
After applying a predetermined preload to nuts 18 and 15,
It is fixed to the drive shaft 13 by. 19 is an oil seal interposed between the companion flange 17 and the housing 10;
This oil seal 19 prevents the lubricating oil 12 from flowing out from the housing 10. A propeller shaft is connected to the companion flange 17 via a universal joint (not shown), and this propeller shaft is rotationally driven by the engine. A plurality of ribs 21 are formed on the inner surface of the subhousing 12 between the front bearing 14 and the rear bearing 15. A differential case 24 is housed inside the housing 10 on the rear side, and both ends of the differential case 24 are fitted with bearings 25, respectively.
It is rotatably supported by the housing 10 via. Rotation axis m of differential case 24
is relative to the rotation axis n of the drive shaft 13,
It is vertical and is displaced upward by a predetermined amount. A flange 27 is formed on the outer periphery of the differential case 24.
protrudes radially outward with respect to the rotation axis m. 2
8 is a ring gear that meshes with the drive pinion gear 16, and this ring gear 28 is fixed to the side surface of the flange 27 with bolts 29 so as to be located coaxially with the rotation axis m, and the lower part of the ring gear 28 is shown in detail in FIG. It is immersed in lubricating oil 11 so as to Drive pinion gear 16 and ring gear 28 constitute final gear 30. A large number of protrusions 32 projecting radially outward are formed on the outer periphery of the flange 27 , and the tips of these protrusions 32 are located on substantially the same circumferential surface as the outer periphery of the ring gear 28 . A pinion mate shaft 35 is fixed to the differential case 24 by a spring pin 36, and the pinion mate shaft 35 is orthogonal to the rotation axis m. The pinion mate shaft 35 has a pair of pinion gears 3 inside the differential case 24.
8 is rotatably supported, and each pinion gear 38 is positioned symmetrically with respect to the rotation axis m. A pair of side gears 40 are rotatably supported inside the differential case 24, and each side gear 40 is located coaxially with the rotation axis m and symmetrically with respect to the pinion mate shaft 35. The pinion gear 38 is engaged with the pinion gear 38. The pair of pinion gears 38 and the pair of side gears 40 constitute a differential gear 41 as a whole. A drive shaft 42 is fixed to each side gear 40 coaxially with the side gear 40, and each drive shaft 42 is connected to a rear wheel via a constant velocity joint (not shown). A passage 44 is formed on the upper side of the housing 10 as shown in detail in FIG. , front bearing 14 and rear bearing 1
5 and communicates with the inside of the sub-housing 12.

Next, the operation of one embodiment of this invention will be explained.

First, when the engine rotates, the rotational force of the engine is transmitted to the drive pinion 13 via the propeller shaft, universal joint, and companion flange 17.
It rotates in a predetermined direction (for example, the direction of arrow A) around the rotation axis n. Therefore, the ring gear 28 meshing with the drive pinion gear 16 and the differential case 24 to which the ring gear 28 is fixed are integrally connected to the rotation axis m.
Rotate clockwise in FIG. 2 about the center. By the way, the lower part of the ring gear 28 is lubricating oil 1.
I am immersed in 1. Furthermore, since the tip of the protrusion 32 is located on substantially the same circumferential surface as the outer periphery of the ring gear 28, the protrusion 32 located on the lower side also has lubricating oil.
is immersed in Therefore, the lubricating oil 11 built in the lower part of the housing 10 is applied to the ring gear 28.
and the projections 32. Therefore, the amount of lubricating oil 11 scraped up becomes larger than when scraped up only by the ring gear as in the prior art. Furthermore, since the tip of the protrusion 32 is located on substantially the same circumferential surface as the outer periphery of the ring gear 28, there is no need to expand the housing 10 radially outward with respect to the central axis m. When the ring gear 28 and the differential case 24 rotate further together, a large amount of the scraped up lubricating oil 11 passes through the passage 44 at the upper rear part of the housing 10 and then flows into the subhousing 12.
It is further scraped up by the pinion shaft 13 and scattered onto the ribs 21, from which it is abundantly supplied to the front bearing 14 and the rear bearing 15. Therefore, the front bearing 14 and the rear bearing 15 will not be damaged, and the life of the front bearing 14 and the rear bearing 15 will be greatly extended. Moreover, the large amount of lubricating oil 11 scraped up by both the ring gear 28 and the protrusion 32 is abundantly supplied to the meshing portion between the ring gear 28 and the drive pinion gear 16, so that the ring gear 28 and the drive pinion gear 1
6 will not be burned in. The lubricating oil 11 provided for lubricating and cooling the front bearing 14 and the rear bearing 15 is
The ring gear 28
The lubricating oil 11 provided for lubricating and cooling the meshing portion of the drive pinion gear 16 is returned to the lower inside of the housing 10 through the ring gear 28 and the like. On the other hand, differential case 24
The rotational force transmitted to the pinion mate shaft 35, pinion gear 38, side gear 40,
The rear wheel is rotated via the rotating shaft and the constant velocity joint.

(Effects of the invention) As explained above, according to this invention, a large number of protrusions are provided on the outer periphery of the flange, the tips of which are located on substantially the same circumferential surface as the outer periphery of the ring gear.
Lubricating oil can be scraped up on both the ring gear and the protrusions without changing the shape of the housing. As a result, the shape of the housing can be simplified and
It is possible to prevent seizure between the ring gear and the drive pinion gear, and to extend the life of the bearing that supports the drive pinion gear.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view showing an embodiment of the final reduction gear for a vehicle according to this invention, and Fig. 2 is a - of Fig. 1.
It is an arrow sectional view. 10... Housing, 11... Lubricating oil, 16...
... Drive pinion gear, 24 ... Differential case, m ... Rotating shaft, 27 ... Flange, 28 ... Ring gear, 32 ... Protrusion.

Claims (1)

[Scope of utility model registration request] A housing that is fixed to the vehicle body and stores lubricating oil in its lower part, a drive pinion gear that is rotatably supported by the housing and rotationally driven by the engine, and a drive pinion gear that is rotatably supported by the housing and radially outward with respect to its rotation axis. a differential case having a flange protruding from the outer periphery of the flange; and a ring gear fixed to the flange so as to mesh with the drive pinion gear and be positioned coaxially with the rotation shaft, the lower part of which is immersed in the lubricating oil. A final reduction gear for a vehicle, characterized in that a number of protrusions whose tips are located on substantially the same circumferential surface as the outer periphery of the ring gear are provided.