CN210290697U - Differential mechanism and differential mechanism shell thereof - Google Patents

Abstract

The utility model relates to a differential mechanism and differential mechanism casing thereof. A half shaft mounting through hole for mounting a half shaft and a planet wheel mounting through hole for mounting a planet wheel shaft are formed in the side wall of the differential shell. A lubrication passage is provided in the differential case. The lubrication passage comprises a half shaft lubrication unit and a planet wheel lubrication unit. The half shaft lubricating unit comprises an oil guide groove and a lubricating ring communicated with the oil guide groove. The oil guide groove is formed in the hole wall of the half shaft mounting through hole and extends spirally along the axial direction of the half shaft mounting through hole. The lubricating ring is arranged on the position, used for mounting the half axle gear gasket, of the inner wall of the shell along the circumferential direction of the half axle mounting through hole. The planet wheel lubricating unit comprises an oil storage tank communicated with the lubricating ring and a lubricating flow channel, wherein two ends of the lubricating flow channel are respectively communicated with the oil storage tank and the planet wheel mounting through hole. The oil storage tank extends along the circumferential direction of the planet wheel mounting through hole. The lubricating flow channel is arranged on the inner wall of the shell and used for mounting the planet wheel gasket. Therefore, the reliability of the differential is greatly improved by the arrangement of the lubricating passage.

Description

Differential mechanism and differential mechanism shell thereof

Technical Field

The utility model relates to a new energy automobile technical field especially relates to a differential mechanism and differential mechanism casing thereof.

Background

With the rapid development of the automobile industry, people have higher requirements on various performances of automobiles, such as the running performance of the automobiles under the condition of high rotating speed. In the differential gear of the gearbox, in order to prevent the planetary gear and the side gear from axially moving when rotating and facilitate the dissipation of heat generated by the planetary gear and the side gear, gaskets are arranged between the differential gear shell and the planetary gear and between the differential gear and the side gear.

However, under high-speed and high-torque conditions, the planetary gear and the side gear generate a large axial pressure, and under the action of the pressure, high-speed friction is generated between the differential case and the planetary gear and the side gear. In the driving process of an automobile, the situation that local temperature is too high due to high-speed friction inevitably occurs to the gasket, and at the moment, the gasket is likely to be burnt out due to the too high temperature, so that the normal operation of the differential is influenced, and the reliability of the traditional differential is low.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a differential and a differential case thereof with high reliability, aiming at the problem of low reliability of the conventional differential.

The utility model provides a differential mechanism casing, is hollow structure, differential mechanism casing's lateral wall is offered and is used for installing the semi-axis installation through-hole of semi-axis and is used for installing the planet wheel installation through-hole of planet wheel axle, still be provided with lubricated route on the differential mechanism casing, just lubricated route includes:

the half shaft lubricating unit comprises an oil guide groove and a lubricating ring communicated with the oil guide groove, the oil guide groove is formed in the hole wall of the half shaft mounting through hole and extends spirally along the axial direction of the half shaft mounting through hole, and the lubricating ring is formed in the position, used for mounting a half shaft gear gasket, of the inner wall of the shell along the circumferential direction of the half shaft mounting through hole; and

the lubricated unit of planet wheel, include with the oil storage tank and both ends of lubricated ring intercommunication respectively with the oil storage tank reaches the lubricated runner of planet wheel mounting hole intercommunication, just the oil storage tank is followed the circumference of planet wheel mounting hole extends, lubricated runner is seted up in shells inner wall is used for the position of installation planet wheel gasket.

In one embodiment, the inner wall of the differential case is provided with a collecting groove along the circumferential direction of the axle shaft mounting through hole, the collecting groove is respectively communicated with the lubricating ring and the oil storage groove, and the collecting groove is positioned outside the lubricating ring.

In one embodiment, the collection groove has a dimension in the axial direction of the axle shaft mounting through hole that is smaller than a dimension of the lube ring in the axial direction of the axle shaft mounting through hole.

In one embodiment, the inner wall of the differential case is provided with an inflow channel and an outflow channel, two ends of the inflow channel are respectively communicated with the oil guide groove and the lubricating ring, two ends of the outflow channel are respectively communicated with the lubricating ring and the collecting groove, and the inflow channel and the outflow channel are arranged in a staggered manner.

In one embodiment, the lube ring communicates with the oil reservoir via an oil passage.

In one embodiment, the oil guide grooves and the oil ducts are two, the spiral directions of the two oil guide grooves are opposite, the extending directions of the two oil ducts are arranged at an included angle, the number of the lubricating flow passages is at least two, and the extending directions of every two adjacent lubricating flow passages are arranged at an included angle.

In one embodiment, an oil inlet channel communicated with the oil guide groove is formed in the outer wall of the differential case.

In one embodiment, an oil separation block is arranged in the oil storage tank.

In one embodiment, the number of the half-shaft lubrication units is two, the two half-shaft lubrication units are located on two sides of the planet wheel lubrication unit, the number of the oil separation blocks is two, and the two oil separation blocks are arranged at intervals so as to divide the oil storage tank into a first tank communicated with one of the lubrication rings and a second tank communicated with the other lubrication ring.

A differential, comprising:

a differential housing;

the half axle gear gasket is arranged on the inner wall of the differential shell and covers the lubricating ring; and

and the planet wheel gasket is arranged on the inner wall of the differential shell and covers the lubricating flow channel.

In the differential and the differential shell thereof, the inner wall of the differential shell can be respectively provided with the half-axle gear gasket and the planet wheel gasket to form the differential. Because the lubricating ring is an annular groove, the lubricating oil in the lubricating ring can realize forced lubrication on the half-axle gear gasket, takes away heat generated by high-speed friction, and greatly reduces the probability of damage caused by overhigh local temperature of the half-axle gear gasket; furthermore, lubricating oil in the oil storage tank partially flows into a lubricating flow channel, and part of lubricating oil also flows into a gap between the planet wheel gasket and the inner wall of the differential shell, so that the planet wheel gasket is forcibly lubricated, heat generated due to high-speed friction is taken away, and the condition that the local temperature of the planet wheel gasket is too high is greatly reduced. Therefore, the arrangement of the lubricating passage effectively improves the lubricating and heat-radiating effects on the semi-axle gear gasket and the planet wheel gasket, and greatly improves the reliability of the differential.

Drawings

FIG. 1 is a schematic view of a differential mechanism according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the differential shown in FIG. 1;

FIG. 3 is a schematic illustration of a differential case of the differential shown in FIG. 1;

FIG. 4 is a schematic illustration of the construction of the axle shaft lubrication unit of the differential shown in FIG. 3;

FIG. 5 is a schematic diagram of an oil inlet passage in the half-shaft lubrication unit shown in FIG. 4.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present invention provides a differential 10 and a differential case 100 thereof. The differential 10 includes a differential case 100, side gear spacers 200, and planet wheel spacers 300. The number of the half axle gear spacers 200 is two, and the half axle gear spacers are a left gear spacer and a right gear spacer. The differential case 100 mainly functions as support and fixing. The differential case 100 has a hollow structure. The side gear spacer 200 and the planet wheel spacer 300 are both housed in the differential case 100, and abut against the inner wall of the differential case 100.

Differential 10 further includes half shafts (not shown), planetary shafts 410, side gears 420, and planetary gears 430. The half shaft and the planetary gear shaft 410 are rotatably inserted through the side wall of the differential case 100. Specifically, the number of the half shafts is two, the two half shafts are respectively a left half shaft (not shown) and a right half shaft (not shown), and the left half shaft and the right half shaft are coaxially arranged. The side gear 420 is sleeved and fixed on the half shaft. Specifically, the left half axle gear and the right half axle gear are respectively sleeved and fixed on the left half axle and the right half axle. The planetary gear 430 is sleeved and fixed on the planetary gear shaft 410. The side gears 420 and the planet gears 430 are located within the differential case 100. Specifically, the side gear spacer 200 is sandwiched between the side gear 120 and the inner wall of the differential case 100, and the planet wheel spacer 300 is sandwiched between the planet gear 430 and the inner wall of the differential case 100.

Referring to fig. 3, the side wall of the differential case 100 according to the preferred embodiment of the present invention is provided with a half axle mounting through hole 110 for mounting a half axle and a planetary wheel mounting through hole 130 for mounting a planetary wheel axle 410. Specifically, in the differential 10, the axle shafts are rotatably inserted into the axle shaft mounting through-holes 110, and the planetary gear shafts 410 are rotatably inserted into the planetary gear mounting through-holes 130. Specifically, the number of the half shaft mounting through holes 110 is two, and the half shaft mounting through holes are respectively used for mounting a left half shaft and a right half shaft.

The differential case 100 is also provided with a lubrication passage 140. The lubrication passage 140 is a groove or a pipe provided in the differential case 100 for the circulation of the lubricating oil. The lubrication passage 140 includes a half shaft lubrication unit 141 and a planetary gear lubrication unit 143.

Referring also to fig. 4, the half shaft lubrication unit 141 includes an oil guide groove 1411 and a lubrication ring 1412 communicating with the oil guide groove 1411. The oil guide groove 1411 is formed in the wall of the half shaft mounting through hole 110 and extends spirally along the axial direction of the half shaft mounting through hole 110. The lubrication ring 1412 is opened to the inner wall of the differential case 100 in a position for mounting the side gear spacer 200 in the circumferential direction of the axle shaft mounting through-hole 110. In the differential 10, the side gear spacer 200 is mounted to the inner wall of the differential case 100 and covers the lubrication ring 1412. Therefore, in the operation process of the differential 10, after the lubricating oil enters the oil guide groove 1411, the lubricating oil flows into the lubricating ring 1412 along the extending direction of the oil guide groove 1411 under the action of the centrifugal force generated when the differential 10 rotates, so as to achieve more complete forced lubrication of the half-axle gear washer 200 and take away the heat generated due to high-speed friction. Specifically, the number of the half-shaft lubrication units 141 is two, and the two half-shaft lubrication units 141 are disposed opposite to each other.

Referring to fig. 3 again, the planetary wheel lubrication unit 143 includes an oil storage groove 1431 communicating with the lubrication ring 1412, and a lubrication flow passage 1432 having two ends respectively communicating with the oil storage groove 1431 and the planetary wheel installation through hole 130. The oil reservoir 1431 extends in the circumferential direction of the planetary gear mounting through hole 130. A lubrication flow passage 1432 opens at a position on the inner wall of the differential case 100 for mounting the planet wheel spacer 300. In the differential 10, the planet pad 300 is mounted to the inner wall of the differential case 100 and covers the lubrication flow passage 1432. Specifically, the planetary gear lubrication unit 143 is located between the two axle shaft lubrication units 141.

During operation of the differential 10, the lubricant in the lubricant ring 1412 flows into the oil reservoir 1431 under the centrifugal force generated when the differential 10 rotates, and a lubricant region with a certain oil thickness is formed in the oil reservoir 1431; further, the lubricating oil in the oil storage groove 1431 flows into the lubricating flow channel 1432 and the gap between the planetary gear pad 300 and the inner wall of the differential case 100 under the action of the centrifugal force generated when the differential 10 rotates and the subsequent extrusion force of the lubricating oil, so as to realize the overall lubrication of the planetary gear pad 300 and take away the heat generated by high-speed friction; finally, the lubricating oil in the lubricating flow passage 1432 and the gap between the planet wheel spacer 300 and the differential case 100 flows to the planet wheel mounting through hole 130 and flows out of the differential case 100 through the planet wheel mounting through hole 130, so that the whole flowing process of the lubricating oil in the differential 10 is realized.

Therefore, as the lubricating ring 1412 is an annular groove arranged along the circumferential direction of the half axle mounting through hole 110, the lubricating oil in the lubricating ring 1412 can realize comprehensive forced lubrication on the half axle gear gasket 200 and carry away heat generated due to high-speed friction, thereby greatly reducing the probability of damage to the half axle gear gasket 200 caused by local over-high temperature. Further, the lubricating oil in the oil storage groove 1431 partially flows into the lubricating flow channel 1432, and also partially flows into a gap between the planet wheel gasket 300 and the inner wall of the differential case 100, so that the planet wheel gasket 300 is completely lubricated, heat generated due to high-speed friction is taken away, and the condition that the planet wheel gasket 300 is damaged due to overhigh local temperature is greatly reduced. Therefore, the arrangement of the lubrication passage 140 effectively improves the lubrication and heat dissipation effects on the half-axle gear pad 200 and the planet gear pad 300, and greatly improves the reliability of the differential 10.

In the present embodiment, the differential case 100 has a collection groove 1413 formed in an inner wall thereof along a circumferential direction of the axle shaft mounting through-hole 110. The collection trough 1413 is in communication with the lube ring 1412 and the oil reservoir 1431, respectively, and the collection trough 1413 is located outside of the lube ring 1412.

During operation of the differential 10, some of the lubricant is thrown away by the rotation of the side gears 420 and the planetary gears 430, which affects the effective utilization of the lubricant. The collection trough 1413 collects the lubricant thrown off the inner wall of the differential case 100 when the gears of the differential 10 rotate, so that the sources of the lubricant in the collection trough 1413 include the lubricant flowing in from the lubricant ring 1412 and the collected lubricant thrown off when the gears of the differential 10 rotate.

In actual operation, the lubricating oil in the collecting tank 1413 flows into the oil storage tank 1431 under the action of centrifugal force generated when the gear rotates, so that the planetary wheel gasket 300 is lubricated forcibly. Because the setting of left collecting vat 1413 and right collecting vat 1423 has increased the volume of the lubricating oil that flows into in oil storage tank 1431 effectively, greatly increased lubricated and the radiating effect to planet wheel gasket 300, further reduced the probability that planet wheel gasket 300 takes place to damage, further improved differential 10's reliability.

Referring again to FIG. 3, further, in the present embodiment, the size of the collection trough 1413 in the axial direction of the axle shaft mounting through hole 110 is smaller than the size of the lube ring 1412 in the axial direction of the axle shaft mounting through hole 110. Therefore, the depth of the collecting groove 1413 is smaller than that of the lubricating ring 1412, and the lubricating oil in the lubricating ring 1412 flows into the collecting groove 1413 only when the lubricating oil in the lubricating ring 1412 reaches a certain oil thickness, so that the situation that the lubricating oil in the lubricating ring 1412 quickly flows into the collecting groove 1413 is avoided, and the lubricating effect of the lubricating ring 1412 on the half-axle gear gasket 200 is affected. Therefore, setting the dimension of the collecting groove 1413 in the axial direction of the half shaft mounting through hole 110 to be smaller than the dimension of the lubricating ring 1412 in the axial direction of the half shaft mounting through hole 110 effectively ensures the lubricating and heat dissipating effects on the half shaft gear spacer 210.

Referring to fig. 4 again, in the present embodiment, the inner wall of the differential case 100 is provided with an inflow channel 1414 and an outflow channel 1415. Both ends of the inflow channel 1414 are respectively communicated with the oil guide groove 1411 and the lubricating ring 1412. Both ends of the outflow passage 1415 communicate with the lubricating ring 1412 and the oil reservoir 1431, respectively. The inflow channel 1414 is offset from the outflow channel 1415.

Thus, the lubricating oil that flows from the oil guide groove 1411 into the lubricating ring 1412 through the inflow channel 1414 can flow out through the outflow channel 1415 into the collection groove 1413 after having to flow in the circumferential direction of the lubricating ring 1412. Therefore, the arrangement of the mutually staggered inflow channel 1414 and the outflow channel 1415 greatly increases the retention time of the lubricating oil in the lubricating ring 1412, ensures the uniformity of the amount of the lubricating oil in the whole left lubricating ring 1412, and further improves the lubricating effect on the left gear pad 210.

Specifically, the outflow channel 1415 is plural, and the plural outflow channels 1415 are respectively disposed at intervals.

Referring again to FIG. 3, in the present embodiment, the lube ring 1412 communicates with the reservoir 1431 via oil passage 1416. Thus, the oil passages 1416 are provided, and communication between the planetary gear lubrication unit 143 and the axle shaft lubrication units 141, respectively, is achieved, thereby achieving communication of the entire oil passages in the lubrication passage 140. Therefore, during the operation of the differential 10, the lubricating oil in the lubricating ring 1412 lubricates the half-axle gear pad 210 and then flows into the oil storage groove 1431 through the oil passage 1416, so that the lubrication and heat dissipation of the planet wheel pad 300 are realized.

Specifically, when the lubrication passage 140 is provided with the collection groove 1413, both ends of the oil passage 1416 communicate with the collection groove 1413 and the oil reservoir 1431, respectively.

Further, in the present embodiment, the oil guide groove 1411 and the oil passage 1416 are both two. The two oil guide grooves 1411 are spirally opposite. The two oil passages 1416 extend at an included angle. The number of the lubrication flow passages 1432 is at least two. The at least two lubrication channels 1432 are divided into two groups, and the lubricated channels 1432 in each group are arranged at an angle to the extending direction of the lubrication channels 1432 in the other group.

It can be understood that the spiral directions of the two oil guide grooves 1411 are respectively defined as a first spiral direction and a second spiral direction, so that the lubrication passage 140 includes two oil passages, the first oil passage is composed of the first spiral oil guide groove 1411, the lubrication ring 1412, an oil passage 1416 matching with the first spiral oil guide groove 1411, the oil storage groove 1431 and one or a part of the lubrication flow passages 1432, and the lubrication flow passages 1432 in the first oil passage are all matched with the first spiral oil guide groove; the second oil path is composed of a second oil guiding groove 1411, a lubricating ring 1412, an oil passage 1416 matching with the second oil guiding groove 1411, an oil storage groove 1431 and one or a part of lubricating flow passages 1432, and the lubricating flow passages 1432 in the second oil path match with the second oil guiding groove 1411.

During operation of the differential 10, both forward and reverse rotation conditions are most likely encountered. If the differential 10 is in a working condition of forward rotation, lubricating oil can lubricate and dissipate heat of the half-axle gear gasket 200 and the planet wheel gasket 300 in the differential 10 through the first oil path; if the differential 10 is in a reverse rotation working condition, the lubricating oil can lubricate and dissipate heat of the half-axle gear pad 200 and the planet wheel pad 300 in the differential 10 through the second oil path. Due to the centrifugal force generated when the differential 10 rotates, the two oil passage grooves 1411 respectively located in the first oil passage and the second oil passage do not interfere with each other under the forward rotation and reverse rotation conditions. Therefore, the arrangement of the first oil path and the second oil path can enable the differential 10 to be lubricated under the working conditions of forward rotation and reverse rotation, and the applicability and the reliability of the differential 10 are greatly improved.

Referring to fig. 5, in the present embodiment, an oil inlet passage 1417 is formed on an outer wall of the differential case 100 and is communicated with the oil guide groove 1411. The oil inlet passage 1417 mainly functions to collect and guide oil. When a bolus of lubricating oil is formed outside the differential case 100, near the oil guide groove 1411, the bolus of lubricating oil collects in the oil inlet passage 1417 and then enters the oil guide groove 1411. From this, set up in the oil feed passageway 1417 of differential casing 100 outer wall, improved greatly that the outside lubricating oil of differential casing 100 can accurately get into and lead in oil groove 1411, improved greatly in the differential mechanism 10 lubrication and the radiating effect to side gear gasket 200 and planet wheel gasket 300.

Specifically, when the lubrication passage 140 includes two oil guide grooves 1411 having different spiral directions, two oil inlet passages 1417 are provided, and the two oil inlet passages 1417 are respectively communicated with the two oil guide grooves 1411.

Referring to fig. 3 again, in the present embodiment, an oil separation block 1433 is disposed in the oil storage groove 1431. From this, the setting of oil removal piece 1433 for oil storage tank 1431 is a non-confined annular structure, thereby has accelerated the velocity of flow of lubricating oil in oil storage tank 1431, has improved the lubricated effect to planet wheel gasket 300 effectively, and then has improved the lubrication efficiency to differential mechanism 10.

Further, in the present embodiment, there are two half-shaft lubrication units 141. Two half-shaft lubrication units 143 are respectively located on both sides of the planetary gear lubrication unit 143. There are two oil removal blocks 1433. Two oil dam blocks 1433 are provided at intervals to partition the oil reservoir 1431 into a first groove 1434 communicating with one of the lube rings 142 and a second groove 1435 communicating with the other lube ring 142. Thus, the two oil separation blocks 1433 are provided, so that the flow rate of the lubricating oil flowing from the two half-shaft lubricating units 141 to the first groove 1434 and the second groove 1435 respectively is faster, the lubricating efficiency of the planet wheel spacer 300 is further improved, and the lubricating efficiency of the differential 10 is further improved.

Specifically, when two half-shaft lubrication units 141 are provided and the half-shaft lubrication units 141 are provided with the oil passages 1416, two ends of the first groove 1434 are respectively communicated with one of the oil passages 1416 and the lubrication flow passage 1432, and two ends of the second groove 1435 are respectively communicated with the other oil passage 1416 and the lubrication flow passage 1432.

In the differential 10 and the differential case 100 thereof, the differential 10 is configured such that the side gear spacer 200 and the planet carrier spacer 300 are respectively attached to the inner wall of the differential case 100. Because the lubricating ring 1412 is an annular groove, the lubricating oil of the lubricating ring 1412 can realize forced lubrication on the side gear gasket 210 and carry away heat generated by high-speed friction, thereby greatly reducing the probability of damage caused by overhigh local temperature of the side gear gasket 200; further, the lubricating oil in the oil storage groove 1431 partially flows into the lubricating flow channel 1432, and partially flows into a gap between the planet wheel gasket 300 and the inner wall of the differential case 100, so that the planet wheel gasket 300 is forcibly lubricated, heat generated due to high-speed friction is taken away, and the situation that the local temperature of the planet wheel gasket 300 is too high is greatly reduced. Therefore, the arrangement of the lubrication passage 140 effectively improves the lubrication and heat dissipation effects on the half-axle gear pad 200 and the planet gear pad 300, and greatly improves the reliability of the differential 10.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a differential mechanism casing, is hollow structure, differential mechanism casing's lateral wall is offered and is used for installing the semi-axis installation through-hole of semi-axis and is used for installing the planet wheel installation through-hole that the star wheel axle was put, its characterized in that, still be provided with lubricated route on the differential mechanism casing, just lubricated route includes:

the half shaft lubricating unit comprises an oil guide groove and a lubricating ring communicated with the oil guide groove, the oil guide groove is formed in the hole wall of the half shaft mounting through hole and extends spirally along the axial direction of the half shaft mounting through hole, and the lubricating ring is formed in the position, used for mounting a half shaft gear gasket, of the inner wall of the shell along the circumferential direction of the half shaft mounting through hole; and

the lubricated unit of planet wheel, include with the oil storage tank and both ends of lubricated ring intercommunication respectively with the oil storage tank reaches the lubricated runner of planet wheel mounting hole intercommunication, just the oil storage tank is followed the circumference of planet wheel mounting hole extends, lubricated runner is seted up in shells inner wall is used for the position of installation planet wheel gasket.

2. The differential case defined in claim 1, wherein the inner wall of the differential case is provided with a collection groove along a circumferential direction of the axle shaft mounting through-hole, and the collection groove communicates with the lubricating ring and the oil reservoir, respectively, and the collection groove is located outside the lubricating ring.

3. The differential case defined in claim 2, wherein the size of said collection groove in the axial direction of said axle shaft mounting through-hole is smaller than the size of said lube ring in the axial direction of said axle shaft mounting through-hole.

4. The differential case according to claim 2, wherein an inflow passage and an outflow passage are formed in an inner wall of the differential case, both ends of the inflow passage communicate with the oil guide groove and the lubricating ring, respectively, both ends of the outflow passage communicate with the lubricating ring and the collecting groove, respectively, and the inflow passage and the outflow passage are arranged in a staggered manner.

5. The differential case defined in claim 1, wherein said lube ring communicates with said oil reservoir through an oil passage.

6. The differential case according to claim 5, wherein there are two oil guiding grooves and two oil passages, the spiral directions of the two oil guiding grooves are opposite, the extending directions of the two oil passages are arranged at an included angle, there are at least two lubricating flow passages, and the extending directions of every two adjacent lubricating flow passages are arranged at an included angle.

7. The differential case defined in claim 1, wherein an oil inlet passage is defined in an outer wall of the differential case and communicates with the oil guide groove.

8. The differential case defined in claim 1, wherein an oil dam is disposed within said oil reservoir.

9. The differential case according to claim 8, wherein there are two of the axle shaft lubricating units, and two of the axle shaft lubricating units are located on both sides of the planetary wheel lubricating unit, and there are two of the oil-separating blocks, and the two oil-separating blocks are provided at an interval to divide the oil reservoir into a first groove communicating with one of the lubricating rings and a second groove communicating with the other lubricating ring.

10. A differential, comprising:

the differential case defined in any one of claims 1 to 9;

the half axle gear gasket is arranged on the inner wall of the differential shell and covers the lubricating ring; and

and the planet wheel gasket is arranged on the inner wall of the differential shell and covers the lubricating flow channel.

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