CN201953968U - Lubrication structure of differential mechanism planetary gear - Google Patents

Abstract

The utility model discloses a lubrication structure of a differential mechanism planetary gear, which belongs to the technical field of an automobile differential mechanism, and solves the problems that the lubrication structure of the existing differential mechanism planetary gear can not conduct lubrication sufficiently, the whole lubrication effect is poor, the frictional noise is large and the service life is short. The lubrication structure of the differential mechanism planetary gear is arranged in a differential mechanism shell which is internally provided with a planetary gear shaft, the planetary gear is sheathed on the planetary gear shaft, and a spiral groove is arranged at the periphery of the planetary gear along the axial direction. As for the lubrication structure of the differential mechanism planetary gear, the spiral groove is arranged at the periphery of the planetary gear along the axial direction, so that the planetary gear can be sufficiently lubricated during the rotation process, and the whole lubrication effect of the planetary gear is benefited to greater extent, a good oil film can be kept on the surface of the planetary gear, the frictional noise is low, and the service life is long.

Description

A lubricating structure for differential planetary gear

technical field

The utility model belongs to the technical field of differential gears of automobiles, and relates to a lubricating part of a differential gear, in particular to a lubricating structure of planetary gears of a differential gear.

Background technique

When the car is running, the angular velocity of the left and right driving wheels is not equal almost every moment. Therefore, if the wheels on both sides are fixed on the same rigid shaft without using a differential, the wheels will inevitably roll and slide. . The above-mentioned phenomenon will not only accelerate the wear of the tires, but also cause more power loss. In severe cases, the car will not be able to turn; speed, so that the car can run normally.

The differential is directly connected to the car tires through the half shaft, and directly bears the torque from the vehicle. When the car is driving in bad road conditions or emergency braking, the damage to the differential is great, and it is easy to cause wear of the gears and breakage of the positioning pins. , increasing vibration noise. In view of the above situation, there is a lubrication structure on the differential planetary gear shaft. The traditional differential planetary gear lubrication method is to process two plane slots on the planetary gear shaft. When the planetary gear is installed on the planetary gear shaft, An oil groove is formed between the planetary gear and the planetary gear shaft, and the lubricating oil flows from the oil groove into the gap between the planetary gear and the planetary gear shaft, and into the gap between the planetary gear gasket and the planetary gear and the housing respectively, to lubricate and cool Effect, in the above-mentioned lubricating structure, the planetary gear cannot be sufficiently lubricated when it rotates, the overall lubrication effect of the planetary gear is not good, the friction noise is large, the surface of the planetary gear cannot maintain a good oil film, and the service life is short.

Contents of the invention

The purpose of this utility model is to provide a kind of lubricating structure of the differential gear planetary gear that can fully lubricate for existing deficiency.

The purpose of this utility model can be achieved through the following technical solutions: a lubrication structure for differential planetary gears, the lubrication structure is arranged in the differential housing, a planetary gear shaft is arranged in the housing, and the planetary gear shaft is sleeved A planetary gear is provided, and it is characterized in that a helical groove is formed on the circumference of the planetary gear shaft along its axial direction.

The lubrication structure of the planetary gear of this differential is to process a concave spiral groove on the planetary gear shaft. The spiral groove is the lubricating oil groove for the planetary gear shaft and the planetary gear. The gap between them, as well as the gap between the inflow planetary gear gasket and the planetary gear and the housing, play a role in lubrication and cooling.

In the above lubricating structure of the differential planetary gear, the section of the spiral groove is semicircular. The purpose of setting in this way is to make the contact area between the helical groove and the planetary gear large, so that sufficient lubrication can be carried out.

In the above-mentioned lubricating structure of the differential planetary gear, one end of the planetary gear shaft has a radial fixing hole, and the planetary gear shaft is fixed to the differential case through the fixing hole through which the positioning pin passes. superior. The axial and radial displacement of the planetary gear shaft is limited, and the fixing structure is simple.

In the above lubricating structure of the differential planetary gear, there is a gap of 0.025 mm to 0.1 mm between the planetary gear shaft and the planetary gear. There is lubricating oil on this gap during actual use.

In the above lubricating structure of the planetary gears of the differential, the planetary gears are connected to the housing through gaskets. The gasket is a special gasket for planetary gears, and its working efficiency is high.

In the above-mentioned lubricating structure of the differential planetary gear, there is a gap less than or equal to 0.1 mm between the spacer and the planetary gear and the housing respectively. In actual application, the gasket is a planetary gear gasket, and the gap between the planetary gear gasket and the planetary gear and the gap between the planetary gear gasket and the housing are all lubricated with lubricating oil.

Compared with the prior art, the lubricating structure of the differential planetary gear has a spiral groove on the circumference of the planetary gear shaft along its axial direction, and the planetary gear can be fully lubricated when it rotates, which is more conducive to the lubrication of the planetary gear. The overall lubricating effect keeps a good oil film on the surface of the planetary gear, with low friction noise and long service life.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the lubrication structure of the differential planetary gear.

FIG. 2 is a schematic front view of the planetary gear shaft in the lubrication structure of the differential planetary gear.

In the figure, 1, housing; 1a, shaft hole; 2, planetary gear shaft; 2a, spiral groove; 2b, fixing hole; 3, planetary gear; 4, positioning pin; 5, gasket.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

When the car is running, the left and right driving wheels rotate at the same time. When driving at a turning point, the distance traveled by the inner wheel is smaller than that of the outer wheel; Rolling edge slips, increasing tire wear. Therefore, in order to ensure that the inner wheels spin slower than the outer wheels, a differential must be installed.

As shown in Figure 1, the differential planetary gear shaft 2 is installed on the differential case 1, and the differential case 1 has a shaft hole 1a for installing the planetary gear shaft 2, and one end of the planetary gear shaft 2 has Radial fixing hole 2b, the planetary gear shaft 2 is fixed on the shaft hole 1a of the differential case 1 through the fixing hole 2b through which the positioning pin 4 passes, and the centerline of the planetary gear shaft 2 and the side gear The center line of the center line is installed at 90 degrees. The planetary gear 3 and the differential side gear are both bevel gears. After the two are assembled, the planetary gear and the differential side gear are mutually limited in the center direction of the differential. The end far away from the center of the differential is limited by the differential case 1 to limit the axial position of the planetary gear 3, and the planetary gear 3 and the differential case 1 are connected by a gasket 5, and the gasket 5 is selected to have a planet Gear gasket; in actual installation, there is lubricating oil between planetary gear shaft 2 and planetary gear 3, and there is a lubrication gap of 0.075mm between planetary gear shaft 2 and planetary gear 3; for gasket 5 and planetary gear 3 There is lubricating oil between the gasket 5 and the housing 1, and there is a 0.1mm gap between the gasket 5 and the planetary gear 3 and the housing 1 respectively.

As shown in Figure 2, the lubrication structure of the differential planetary gear is to process a concave spiral groove 2a on the planetary gear shaft 2, and the cross section of the spiral groove 2a is processed into a semicircle. The lubricating oil groove of the gear shaft 2 and the planetary gear 3, the lubricating oil flows into the gap between the planetary gear 3 and the planetary gear shaft 2 from the lubricating oil groove, and flows into the gap between the gasket 5 and the planetary gear 3 and the housing 1 respectively, thereby to lubrication and cooling.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (6)

1. A lubricating structure for differential planetary gears, the lubricating structure is arranged in the differential housing (1), the planetary gear shaft (2) is arranged in the housing (1), and the planetary gear shaft (2) ) is sheathed with a planetary gear (3), characterized in that a helical groove (2a) is opened on the circumference of the planetary gear shaft (2) along its axial direction. 2. The lubricating structure of differential planetary gears according to claim 1, characterized in that the cross-section of the spiral groove (2a) is semicircular. 3. The lubricating structure of differential planetary gears according to claim 1, characterized in that one end of the planetary gear shaft (2) has a radial fixing hole (2b), and the planetary gear shaft (2) passes through The positioning pin (4) passes through the fixing hole (2b) on it to fix it on the differential case (1). 4. The lubricating structure of differential planetary gears according to claim 1, characterized in that there is a gap of 0.025 mm to 0.1 mm between the planetary gear shaft (2) and the planetary gear (3). 5. The lubricating structure of differential planetary gears according to claim 1, characterized in that said planetary gears (3) are connected to the housing (1) through gaskets (5). 6. The lubricating structure of differential planetary gears according to claim 5, characterized in that, the gaps less than or equal to 0.1mm gap.

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