JPH0220528Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a drive axle device for transmitting power from an engine to wheels in a vehicle.

<Prior Art> As shown in the longitudinal sectional front view of FIG. 5, a conventional drive axle device includes a differential gear reducer 3 installed in a central recess 2 of a housing 1, and a final reducer 3 installed in recesses 4 at both ends of the housing 1. 5 is installed, the differential gear reducer 3 and the final reducer 5 are connected by an axle shaft 6, the axle shaft 6 is surrounded by a cylindrical part 7 of the housing 1, and the bottom surface of the cylindrical part 7 is connected to the center The recess 2 was set above the bottom surface of the recess 4 at both ends and below the oil level in the housing 1. and,
The gears and bearings of the differential gear reducer 3 and final reducer 5 were lubricated and cooled by lubricating oil in the housing 1. Furthermore, in the construction vehicle, the planetary gear type final reduction gear 5 was also provided with a disc brake 10. In the figure, 11 is an input gear to the differential gear reducer 3, 12 is a rim of a wheel fixed to the output shaft 13 of the final reducer 5, and 16 is a large gear of the reducer 3.

However, in the above drive axle device, the amount of oil in the concave portions 4 at both ends of the final reducer 5 portion is small due to its structure, and it easily becomes high temperature due to heat generated by the brakes.
There is a risk of oil deterioration, which has the disadvantage that the brake disc 10 is easily damaged.

<Purpose> Therefore, the present invention has developed an oil feeding device that forcibly circulates the low-temperature lubricating oil in the central recess, which has a large amount of oil and is relatively low-temperature with little heat generated by only stirring by gears, through the recesses at both ends. The purpose is to provide a simple structure and low cost.

<Embodiment> Hereinafter, a first embodiment of the present invention will be explained with reference to FIGS.
The differential gear reducer and the final reducer are connected by an axle shaft 6, and the axle shaft 6 is surrounded by the cylindrical part 7 of the housing 1. The bottom surface 7a is located above the bottom surfaces 2a and 4a of the center recess 2 and both end recesses 4, and is located below the oil level 8a in the housing 1. The cylindrical portion 7 is connected to the cylinder portion 7 by a circulation pipe 9 passing outside thereof, and rotary vanes 15 are fixed to the axle shaft 6. These rotary vanes 15 and the circulation pipe 9 circulate the low-temperature lubricating oil 8 in the central recess 2 to the axle shaft 6. An oil feeding device A is provided for forcibly circulating oil through the recesses 4 at both ends.

The oil feeding device A passes through the outside of the cylindrical portion 7, and has one end connected to the central recess 2 through a joint pipe 14, and the other end connected to the recessed portions 4 at both ends.
and rotary vanes 15 fixed to the final reduction gear sides of the left and right axle shafts 6, respectively.

The rotating blade 15 has a twisted blade portion, and the twisting directions of the left and right rotating blades are set to be opposite to each other. Therefore, by rotating the axle shaft 6, separate flows can be made on the left and right sides, and by changing the direction of rotation of the axle shaft 6, the direction of the flow of the lubricating oil 8 can be changed. In this embodiment, when the axle shaft 6 rotates clockwise, the lubricating oil on one final reduction gear side flows in the direction of the Y arrow, and the lubricating oil on the other final reduction gear side flows in the direction opposite to the Y arrow. Further, when the axle shaft 6 rotates to the left, each flow becomes reverse. At this time, the large gear of the differential gear reducer in the central recess 2 (see large gear 16 in FIG. 5) also rotates, further promoting the flow of the lubricating oil 8, so that the lubricating oil 8 flows into the circulation pipe 9. and circulate within the housing 1. Therefore, the high-temperature lubricating oil 8 in the recesses 4 at both ends moves into the central recess 2, and the low-temperature lubricating oil 8 in the central recess 2 sequentially moves into the recesses 4 at both ends.
Concave portions 4 at both ends with a small amount of oil accumulated as each oil is mixed.
The lubricating oil 8 inside will no longer deteriorate.

Next, a second embodiment of the present invention will be described with reference to FIG. 4. In this example, the oil feeding device A for forcibly circulating the lubricating oil from the center recess to the both end recesses is as follows:
When the amount of heat generated becomes extremely large due to sudden braking, etc., the temperature of the lubricating oil inside the final reduction gear, where the disc brake is installed, rises rapidly, so the oil level increases even more than in the first embodiment. It is used when it is necessary to lower the temperature. For this,
The oil feeding device A is constructed by connecting an oil temperature sensor 17 provided on the final reduction gear side having a disc brake to a forward/reverse switching type electric motor 19 housed in a motor storage box 18. The motor storage box 18 is connected at both ends to the left and right circulation pipes 9 by joint pipes 14 on the outside of the housing 1, and has a central recess 2.
Built inside. The electric motor 19 is provided with a centrifugal auxiliary vane 20 on one of its rotating shafts, and its rotation enables oil to be sent from the pipe 9 into the central recess, and the lubricating oil in the recesses at both ends is integrated into the left and right recesses. Flowing.

In this second embodiment, when the vehicle moves forward, the temperature of the lubricating oil on the disc brake side is
When the temperature rises above a certain level, the preset oil temperature sensor 17 reacts, the electric motor 19 starts, and the auxiliary blades 20 rotate, causing the flow of the lubricating oil 8 in the circulation pipe 9 to rapidly increase. Become,
Correspondingly, the flow of lubricating oil 8 within housing 1 becomes faster. This speeds up the mixing of the high-temperature lubricant on the disc brake side and the low-temperature lubricant in the central recess, thereby eliminating deterioration of the lubricant.

Next, when the vehicle is traveling backwards, the axle shaft 6 rotates in the opposite direction, so the lubricating oil flows in the opposite direction, and when the temperature of the lubricating oil on the disc brake side rises above a certain level, The oil temperature sensor 17 reacts, the electric motor 19 starts and rotates in reverse, and the auxiliary blades 20 rotate in the reverse direction, causing the flow of lubricating oil 8 in the circulation pipe 9 to rapidly increase, and accordingly, the flow of lubricating oil 8 in the housing 1 increases. The flow of lubricating oil 8 becomes faster. This speeds up the mixing of the high-temperature lubricant on the disc brake side and the low-temperature lubricant in the central recess, eliminating deterioration of the lubricant.

<Effects> As is clear from the above explanation, the present invention has a differential gear reducer installed in the central recess of the housing, final reducers installed in the recesses at both ends of the housing, and the differential gear reducer and final reducer are connected by an axle shaft, the axle shaft is surrounded by a cylindrical portion of the housing, and the bottom surface of the cylindrical portion is connected to the central recess;
In the drive axle device, which is set above the bottom surface of the recessed portions at both ends and below the oil level in the housing, the central recessed portion and the recessed portions at both ends are connected to each other by a circulation pipe passing outside the cylindrical portion, and the axle shaft A driving axle device characterized in that a rotary vane is fixed to the rotary vane, and an oil feeding device is provided for forcibly circulating lubricating oil into the circulation pipe and the housing by means of the rotary vane and the circulation pipe. It is.

Therefore, according to the present invention, (i) the low-temperature lubricating oil in the central recess is forcibly circulated through the recesses at both ends to quickly suppress the rapid temperature rise of the lubricating oil, thereby preventing oil deterioration; , it is possible to improve vehicle safety and durability.

(ii) Since the circulation pipe is configured to pass outside the cylindrical portion, the pipe diameter can be reduced and the oil can be cooled quickly.

(iii) By the rotating blades, the high-temperature lubricating oil in the recesses at both ends moves into the central recess, and the low-temperature lubricating oil in the central recess sequentially moves into the recesses at both ends, and they are mixed, so that the brake effect is improved. Cooling can be performed quickly, and deterioration of the lubricating oil in the concave portions at both ends with a small amount of oil storage can be prevented.

(iv) the rotating vane is fixed to the axle shaft;
The structure is simple and can be manufactured at low cost because it is configured to feed oil using the movement of the axle shaft.

[Brief explanation of the drawing]

Fig. 1 is a front view of the first embodiment of the drive axle device of the present invention, Fig. 2 is a partially omitted vertical sectional front view of the first embodiment of the invention, Fig. 3 is a perspective view of the rotating blade, and Fig. 4 is a front view of the first embodiment of the drive axle device of the present invention. A longitudinal sectional front view of the electric motor section of the second embodiment of the present invention,
FIG. 5 is a longitudinal sectional plan view of a conventional drive axle device. 1: Housing, 2: Center recess, 4: Both ends recess, 6: Axle shaft, 7: Cylinder, 7a: Bottom of cylinder, 2a: Bottom of center recess, 4a: Bottom of both ends recess, 8a: Oil level, 9: Circulation pipe, 15:
Rotating vane, 17: oil temperature sensor, 18: motor storage box, 19: electric motor, 20: centrifugal auxiliary vane, A: oil feeding device.

Claims (1)

[Scope of utility model registration request] A differential gear reducer is installed in the central recess of the housing, and a final reducer is installed in the recesses at both ends of the housing, the differential gear reducer and the final reducer are connected by an axle shaft, and the axle shaft is connected to the cylinder of the housing. In the drive axle device, the bottom surface of the cylindrical portion is set above the bottom surfaces of the central recess and the both end recesses and below the oil level in the housing. A rotary vane is fixed to the axle shaft, and the rotary vane and the circulation pipe are connected to each other by a circulation pipe passing outside the cylindrical part. A drive axle device characterized in that the device is provided with a drive axle device.