JPS605150Y2 - Reducer lubrication device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lubrication device for a reduction gear, which is typified by a transfer of a multi-shaft drive vehicle.

For example, in automobiles such as large trucks that have a large final reduction ratio, a reduction gear called a transfer is installed between an input shaft driven via a propeller shaft or interaxle differential and a hypoid gear fixed to the differential case of the drive shaft. Interventions may be required.

Due to the height of the propeller shaft above ground, such reduction gears often have gears arranged in multiple stages above and below.

In order to lubricate the bearings and gears of the reducer, lubricating oil is generally stored at the bottom of the reducer case, and the lubricating oil is splashed up and supplied to each part by the gear located at the lowest stage.

However, in a reducer in which the gears are arranged in multiple stages above and below, most of the lubricating oil splashed up by the gear located at the lowest stage adheres to the gears and bearings below the middle stage, so It is difficult to supply a sufficient amount of lubricating oil to gears, bearings, etc.

To solve this problem, either make the reducer case large enough to provide a flight path for lubricating oil that bypasses the middle gears, or install an oil pump to forcibly supply lubricating oil to each part. Good.

However, in the former case, the reduction gear case becomes unnecessarily large and heavy, and there is a limit to the flight distance of the lubricating oil, making it impractical. In addition to increasing the number of oil supply passages, it is necessary to provide extremely complicated oil supply passages, which increases costs.

The present invention has been developed in view of the above, and is designed to supply part of the lubricating oil splashed up by the lowest gear onto the inner circumferential surface of a ring fixed to the side surface of the middle gear. This makes it possible to sufficiently splash and supply lubricating oil to the gears, bearings, etc. in the uppermost stage by utilizing the centrifugal force caused by the rotation of the ring.

The present invention will be described below with reference to an illustrated embodiment.

In the figure, 1 is the rear axle housing 2 of the truck.
A differential carrier case that is tightened and fixed to the front of the
A transfer 3 as a speed reducer is fixed to the front part.

This transfer 3 includes an input gear 6 which is supported via a bearing 5 at the upper end of a vertically long box-shaped transfer case 4, and a hypoid pinion which is supported via a bearing 7 at the lower end of the case 4. 8, and a pinion drive gear 9 inserted and fixed into the pinion 8 and the input gear 6 are meshed and interlocked via an idler gear 11 which is pivotally supported in the middle part of the transfer case 4 via a bearing 10.

The hypoid pinion 8 is a hypoid gear 1 as a final reduction gear located inside the differential carrier case 1.
It is interlocked with 2.

In addition, by tightening and fixing a flange coupling 13 to the shaft end of the input gear 6 led out of the transfer case 4, torque and torque from a propeller shaft (not shown) can be applied directly or to an interaxle differential (not shown). It is now input via .

Here, a ring 15 is fixed to the rear side surface of the idler gear 11, the inner peripheral surface of which is recessed and a plurality of holes 14 formed in the curved surface.

On the other hand, near the upper end of the front wall of the differential carrier 1,
By forming an oil receiver 16 that opens widely toward the rear, a portion of the lubricating oil splashed up by the hypoid gear 12 from the bottom of the differential carrier case 1 is received.

A guide hole 17 is formed in the rear wall of the transfer case 4 to guide the lubricating oil accumulated in the oil receiver 16 down onto the inner peripheral surface of the ring 15.

18 is a drain plug provided at the bottom of the transfer case 4.

In the above configuration, when the input gear 6 is rotated via the flange coupling 13, the idler gear 11
The hypoid pinion 8 rotates via the pinion drive gear 9, the hypoid gear 12 meshing with the pinion 8 rotates, and rotational force is input to a differential mechanism (not shown).

When the hypoid gear 12 rotates in this manner, the lubricating oil accumulated at the bottom of the differential carrier case 1 is splashed up and a portion of it flows into the oil receiver 16.

The lubricating oil that has flowed into the oil receiver 16 passes through a guide hole 17 provided in the transfer case 4 and is guided down to the inner peripheral surface of a ring 15 fixed to the idler gear 11 .

Furthermore, since the ring 15 is rotating together with the idler gear 11, the lubricating oil that has been supplied to the inner circumferential surface of the ring 15 as described above rotates together with the ring 15.

Then, as centrifugal force is generated in the lubricating oil due to this rotation, the lubricating oil temporarily stored on the inner circumferential surface of the ring 15 is scattered in the radial direction from the hole 14 formed in the circumferential angle of the ring 15.

In this case, sufficient lubricating oil is splashed and supplied not only to the bearing 7 of the hypoid pinion 8 located below the idler gear 11 to which the ring 15 is fixed, but also to the bearing 5 of the input gear 6 located above the idler gear 6. be done.

The lubricating oil after lubricating these bearings flows down to the bottom of the transfer case 4 and is returned from the bottom of the case 4 to the bottom of the differential carrier case 1.

In the embodiment, a transfer is exemplified as a reduction gear, and a hypoid gear 12 as a final speed gear collects a portion of the lubricating oil splashed up from the bottom of the differential carrier case 1 by a ring 15 fixed to the idler gear 11 at the upper end inside the transfer case 4. However, if the lubrication mechanism in the differential carrier case 1 and the lubrication mechanism in the transfer case 4 are made independent, the lowest gear in the transfer case 4, that is, the pinion The lubricating oil splashed up by the drive gear 9 may be supplied down onto the inner peripheral surface of the ring 15.

Further, in the embodiment, the splashed lubricating oil is supplied down onto the inner peripheral surface of the ring 15 using the oil receiver 16 and the guide hole 17, but the lubricating oil guiding means is arbitrary.

As explained above, according to the lubrication device according to the present invention,
By supplying some of the lubricating oil splashed up by the gear located at the lowest stage onto the inner circumferential surface of a ring fixed to the side of the gear located at the middle stage, centrifugal oil that accompanies the rotation of this ring is The lubricating oil that has been supplied to the inner peripheral surface of the ring as described above is dispersed further upward by using force, so it can be used, for example, in a transfer installed in the rear axle housing of a truck. Even if the reducer has to be long in the vertical direction due to shape and weight constraints, lubricating oil can be sufficiently sprayed and supplied to the top gear and bearings without using an oil pump etc. can.

[Brief explanation of the drawing]

FIG. 1 is a front view of a transfer equipped with a lubricating device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG.
FIG. 3 is a sectional view of the gear showing the state in which the ring is attached, and FIG. 4 is a sectional view taken along line BB in FIG. 3. 1...Differential carrier case, 3...Transfer, 4...Transfer case, 5...
・Curved bearing, 6...Input gear, 7...Curved bearing, 8...Hypoid pinion, 9・Pinion dry carrier, 10...Bearing, 11・Curve・
Idler gear, 12... Curved hypoid gear, 14... Hole, 15... Curved ring, 16... Oil pan, 17
・Opening inner hole.

Claims (1)

[Scope of utility model registration request] In a reducer in which gears are arranged in multiple stages above and below, a ring having a recessed inner peripheral surface is fixed to the side surface of the gear located in the middle stage, and a large number of holes are bored in the peripheral surface of the ring, and A lubrication device for a reduction gear, characterized in that a guide means is provided for supplying lubricating oil splashed up from the bottom of the reduction gear case by the gear located at the lowest stage onto the inner circumferential surface of the ring.