JPH0638208Y2 - Lubrication structure of differential device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lubrication structure of a differential device (hereinafter also referred to as a differential) of an automobile or the like, and particularly to improvement of lubrication of a differential gear and a differential side bearing.

(Prior art) Conventionally, the lubricating oil is supplied to each gear inside the differential device by finalizing the lubricating oil in the oil sump under the differential carrier (for FR vehicles) or the transmission case (for FF vehicles and RR vehicles). It was to lift up with a ring gear to lubricate the final gear consisting of the ring gear and the drive pinion, and at the same time to lubricate the differential gear and the left and right differential side bearings by the splashed lubricating oil.

However, in the conventional lubrication system, the lifted lubricating oil is dispersed, so even if the final gear itself is sufficiently lubricated, the lubricating oil is supplied to the differential gear and the differential side bearings separated from the final ring gear. There was a problem that there was no certainty.

(Problems to be Solved by the Invention) In order to solve the above problems, the present invention provides a lubrication structure for a differential device that concentrates and supplies lubricating oil to differential gears and differential side bearings to enable reliable lubrication. The purpose is to do.

(Means for Solving the Problems) The above-mentioned object is to support a differential carrier via left and right differential side bearings in a housing formed by joining a transmission case and a differential cover,
A final ring gear is coupled to an end surface of the diff carrier, and a differential device in which left and right drive shafts are coupled by a diff gear inside the diff carrier, the diff carrier is divided at a center line of the drive shaft, A tubular pad made by joining die-cutting groove pieces that open in opposite directions from the transmission case and the differential cover inside the joint of the transmission case and the differential cover above the center line of the drive shaft. A groove is formed along the center line of the drive shaft, and an oil is formed above the final ring gear in the groove to open in the rotational direction of the final ring gear and receive the lubricating oil lifted up by the final ring gear. To form a mouth, the upper part of the differential gear and left and right differential side bearing of the trough grooves is achieved by the lubricating structure of a differential device, characterized in that the formation of the oil outlet.

(Operation) In the lubrication structure of the differential device configured as described above, the lubricating oil scraped up by the final ring gear is favorably collected in the oil inlet opening in the rotation direction thereof, and the lubricating oil is passed through the trough to exit from the oil outlet. It is possible to drop and reliably feed the differential gear and the left and right differential side bearings, and it is possible to secure good lubrication performance.

Further, the groove can be formed by forming groove pieces on the transmission case and the differential cover by die-cutting and joining the groove pieces together, which does not require the use of a core during casting and is inexpensive. In addition, the dimensional accuracy can be excellently formed.

(Embodiment) The present invention will be described below with reference to the drawings illustrating an embodiment.

FIG. 1 is a longitudinal sectional view of a lubricating structure of a differential gear for an FF vehicle according to the present invention. FIG. 1 is a sectional view taken along the line AA of the transmission assembly side view of FIG.

1a shows the engine center line and 3a shows the drive shaft center line. In the case of an FF vehicle, the differential device is directly connected to the transmission and is connected to the position indicated by the drive shaft center line 3a. The differential device is assembled in a housing composed of a transmission case 1 and a differential cover 2. The left and right drive shafts 3 are connected by a differential gear 5 inside the differential carrier 4. A final ring gear 6 that meshes with a drive pinion (not shown) is coupled to the end surface of the differential carrier 4. The left and right sides of the differential carrier 4 (illustration, hereinafter the same) are supported by the housing by differential side bearings 7 and 8. An oil sump 9 for containing lubricating oil is provided at the bottom of the housing.

Along the inner surface of the housing above the drive shaft center line 3a, there is provided a lubricating oil guide groove consisting of a groove 11 having a cylindrical cross section as shown in FIG. This groove 11 is
Inside the joint portion between the transmission case 1 and the differential cover 2 above the center line 3a of the drive shaft 3, the groove pieces 1a, 2a formed by die-cutting and opening to face each other from the transmission case 1 and the differential cover 2 are joined. And is formed along the center line 3a of the drive shaft 3, and the portion of the groove 11 located in the rotation surface of the final ring gear 6 of the groove 11, as shown in FIG. An oil inlet 12 is provided to receive the lubricating oil that the final ring gear 6 scrapes up. Further, oil outlets 13, 14, 15 are provided at the portions of the groove 11 located above the differential gear 5 and the left and right differential side bearings 7, 8, respectively.

In the lubrication structure of the differential device configured as described above, each gear and each bearing are lubricated by the final ring gear 6 scraping up the lubricating oil in the oil reservoir 9. Lubricating oil that has been scraped up is introduced from the oil inlet 12, travels through the trough 11, and exits from the oil outlet.
Guided by 13,14,15. The lubricating oil that falls from these oil outlets is used for the differential gear 5, the left and right differential side bearings 7,
8 is reliably supplied and sufficient lubrication is performed.

(Effect of the Invention) In the present invention, a diff carrier is supported through left and right diff side bearings in a housing formed by joining a transmission case and a differential cover, and a final ring gear is coupled to an end surface of the diff carrier. In the differential device in which the left and right drive shafts are coupled to each other by a differential gear inside the differential carrier, the differential carrier is divided by the center line of the drive shaft, and the transmission case and the differential above the center line of the drive shaft. Inside the joint portion of the cover, a cylindrical groove is formed along the center line of the drive shaft by joining die-cut groove pieces that open in opposite directions from the transmission case and the differential cover. , An oil inlet, which opens in the direction of rotation of the final ring gear and receives the lubricating oil lifted by the final ring gear, is formed above the final ring gear in the groove, and the differential gear and the left and right gears in the groove are formed. An oil outlet is formed in the upper part of the differential side bearing, so that the lubricating oil scraped up by the final ring gear is well collected in the oil inlet opening in the rotation direction, and passes through the groove to allow the lubricating oil to pass through. Can be dropped from the oil outlet to reliably supply oil to the differential gear and the left and right differential side bearings, and good lubricating performance can be ensured.

Further, the groove can be formed by forming groove pieces on the transmission case and the differential cover by die-cutting and joining the groove pieces together, which does not require the use of a core during casting and is inexpensive. In addition, there is an effect that dimensional accuracy can be formed well.

[Brief description of drawings]

1 is a longitudinal sectional view of an embodiment, FIG. 2 is a side view of a transmission assembly, FIG. 3 is a side view taken along the line BB of FIG. 1, and FIG. 4 is a sectional view taken along the line C-C of FIG. Indicates. 1 …… Transmission case (housing) 2 …… Differential cover (housing) 3 …… Drive shaft 3a …… Drive shaft center line 4 …… Differential carrier 5 …… Differential gear 6 …… Final ring gear 7,8 …… Differential bearing 9 …… Oil sump 11 …… Groove 12 …… Oil inlet 13,14,15 …… Oil outlet

Claims (1)

[Scope of utility model registration request] 1. A diff carrier 4 is supported in the housing formed by joining a transmission case 1 and a differential cover 2 via left and right diff side bearings 7 and 8, and a final ring gear 6 is provided on an end face of the diff carrier 4. And the differential carrier 4
In a differential device in which the left and right drive shafts 3, 3 are internally coupled by a diff gear 5, the diff carrier 4 is connected to the center line of the drive shaft 3.
It is divided by 3a, and inside the joint portion of the transmission case 1 and the differential cover 2 above the center line 3a of the drive shaft 3, a die-cut is formed so as to open from the transmission case 1 and the differential cover 2 so as to face each other. A cylindrical groove 11 formed by joining the groove pieces 1a, 2a is formed along the center line 3a of the drive shaft 3, and the groove 11 is formed above the final ring gear 6. And an oil inlet 12 for receiving the lubricating oil lifted up by the final ring gear 6 is formed in the rotation direction of the above, and the upper part of the groove 11 above the differential gear 5 and the left and right differential side bearings 7, 8 is formed. A lubricating structure for a differential device, characterized in that oil outlets 13, 14, 15 are formed.