CN220581634U - Self-lubricating differential mechanism shell - Google Patents
Self-lubricating differential mechanism shell Download PDFInfo
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- CN220581634U CN220581634U CN202321812408.XU CN202321812408U CN220581634U CN 220581634 U CN220581634 U CN 220581634U CN 202321812408 U CN202321812408 U CN 202321812408U CN 220581634 U CN220581634 U CN 220581634U
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- Prior art keywords
- ball pad
- groove
- oil
- planetary gear
- spherical surface
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- 238000005461 lubrication Methods 0.000 claims abstract description 49
- 239000003921 oil Substances 0.000 claims description 76
- 239000010687 lubricating oil Substances 0.000 claims description 42
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The self-lubricating differential mechanism casing sets up the ball pad lubrication groove corresponding with planetary gear ball pad on the differential mechanism casing internal sphere, its characterized in that: the ball pad lubrication groove is oval shape and offer in planet gear shaft hole periphery, the major axis direction of ball pad lubrication groove is unanimous with the direction of rotation of differential mechanism casing, the major axis of ball pad lubrication groove is greater than planet gear ball pad excircle diameter, the minor axis is less than planet gear ball pad excircle diameter, adjacent ball pad lubrication groove passes through the oil duct UNICOM. The utility model avoids the friction loss between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential mechanism shell caused by high temperature, and the friction pair between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential mechanism shell can obtain sufficient oil film lubrication, thereby improving the lubrication effect and reducing the wear rate of the outer spherical surface of the planetary gear ball pad to the inner spherical surface of the differential mechanism.
Description
Technical Field
The utility model relates to a self-lubricating differential case, and belongs to the technical field of differential lubrication.
Background
When the vehicle runs on a curved road or an uneven road, the differential mechanism is used for ensuring the output rotation speed difference of the left wheel and the right wheel of the vehicle, the planetary gear can rotate around the planetary shaft to form autorotation so as to drive the half shaft gear to transmit the required rotation speed difference to the left wheel and the right wheel, and the stable running of the vehicle is ensured; when the differential is in operation, the planet gears not only "revolve" about the center of the side gears, but also "spin" about the planet shafts. At this time, the inner hole of the planet gear and the planet gear shaft form a pair of friction pairs, the outer spherical surface of the planet gear and the inner spherical surface of the planet gear ball pad form a pair of friction pairs, and the tooth surface of the planet gear and the tooth surface of the side gear form a pair of friction pairs. The planetary gear participates in the work of three pairs of friction pairs simultaneously, and the working condition is bad, so that the planetary gear generates heat severely. The friction coefficient between the outer spherical surface of the planet gear and the inner spherical surface of the ball pad of the planet gear is increased due to the fact that the over-high temperature for a long time, the outer spherical surface of the planet gear and the inner spherical surface of the ball pad of the planet gear are glued and bonded, the planet gear and the ball pad of the planet gear which are glued together rotate around a planet gear shaft, friction is generated between the outer spherical surface of the ball pad of the planet gear and the inner spherical surface of the differential shell, the inner spherical surface of the differential shell made of spheroidal graphite cast iron is easy to wear rapidly, accordingly the service life of the differential assembly is shortened, and the running performance of the whole vehicle is influenced. In the prior art, an oil groove is formed in the inner spherical surface of the differential case or the outer spherical surface of the planetary gear ball pad for storing oil, so that lubrication is formed between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential case, and abrasion is reduced. However, during the operation of the differential mechanism, the planetary gears squeeze the ball pad under the action of huge axial force, so that the lubricating oil stored between the differential shell and the ball pad is difficult to flow, the generated heat cannot be timely discharged through the lubricating oil, and the lubricating and cooling effects are limited.
Disclosure of Invention
According to the self-lubricating differential shell provided by the utility model, the friction loss between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential shell caused by high temperature is avoided, the friction pair between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential shell can be fully lubricated by an oil film, the lubricating effect is improved, and the wear rate of the outer spherical surface of the planetary gear ball pad to the inner spherical surface of the differential shell is reduced.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the self-lubricating differential mechanism casing sets up the ball pad lubrication groove corresponding with planetary gear ball pad on the differential mechanism casing internal sphere, its characterized in that: the ball pad lubrication groove is oval shape and offer in planet gear shaft hole periphery, the major axis direction of ball pad lubrication groove is unanimous with the direction of rotation of differential mechanism casing, the major axis of ball pad lubrication groove is greater than planet gear ball pad excircle diameter, the minor axis is less than planet gear ball pad excircle diameter, adjacent ball pad lubrication groove passes through the oil duct UNICOM.
Preferably, the number of the ball pad lubrication grooves is four, each ball pad lubrication groove is concentric with the corresponding planetary gear shaft hole, and the oil duct is formed along the rotation direction of the differential case.
Preferably, the depths of the ball pad lubricating oil groove and the oil duct are 1-2 mm, the long axis of the ball pad lubricating oil groove is larger than the diameter of the outer circle of the ball pad of the planet gear by 2-3 mm, and the short axis is larger than the diameter of the shaft hole of the planet gear by 2-3 mm.
Preferably, the oil duct comprises the bar oil duct that sets up along differential mechanism casing direction of rotation and the oil storage groove of two bar oil ducts of UNICOM, bar oil duct one end ball pad lubrication groove UNICOM, the other end and the oil storage groove UNICOM, the width of oil storage groove is greater than the width of bar oil duct, length is less than the length of bar oil groove.
Preferably, the oil storage groove is a square oil groove, the width of the oil storage groove is smaller than the short axis of the ball pad lubricating oil groove, and the width of the bar-shaped oil groove is 3-4 mm.
The beneficial effects of the utility model are as follows:
1. according to the utility model, the ball pad lubricating oil groove is formed in the differential shell, the ball pad lubricating oil groove is formed in the periphery of the planetary gear shaft hole and is in an elliptical shape, the outer spherical surface of the planetary gear ball pad is matched with the inner spherical surface of the differential, the ball pad lubricating oil groove is just positioned on the outer spherical surface of the planetary gear ball pad, the long shaft end part of the ball pad lubricating oil groove extends out of the outer spherical surface of the planetary gear ball pad, the lubricating oil is promoted to flow in the ball pad lubricating oil groove and between the adjacent ball pad lubricating grooves by utilizing the centrifugal force generated during rotation of the differential shell, the lubricating oil between the inner spherical surface of the differential shell and the outer spherical surface of the planetary gear ball pad flows smoothly, the flowing lubricating oil takes away the friction loss between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential shell caused by high temperature, the elliptical shape characteristic of the ball pad lubricating oil groove enables the outer spherical surface of the planetary gear ball pad to be contacted with the elliptical oil groove from inside to outside when the planetary gear ball pad rotates around a planetary gear shaft, the friction pair between the outer spherical surface of the planetary gear ball pad and the inner spherical surface of the differential shell can obtain sufficient lubrication, the lubricating effect is improved, and the wear rate of the inner spherical surface of the planetary gear ball pad is reduced.
2. The adjacent ball pad lubrication grooves are communicated by an oil passage, the oil passage is formed along the rotation direction of the differential case, when the differential case rotates, the lubricating oil flows in the oil passage, so that the lubricating oil can smoothly flow between the ball pad lubrication grooves, the oil quantity of each ball pad lubrication groove is ensured to be uniform and sufficient, and the uniform lubrication of the spherical surface of each planetary gear ball pad is ensured.
3. The oil storage tank can store lubricating oil flowing out of the ball pad lubricating oil tank and the inner wall of the differential mechanism shell, and can supplement lubricating oil to the ball pad lubricating oil tank, so that the friction pair between the outer spherical surface of the ball pad of the planetary gear and the inner spherical surface of the differential mechanism shell is fully lubricated.
Drawings
FIG. 1 is a schematic illustration of a self-lubricating differential housing in an embodiment.
Fig. 2 is a cross-sectional view of fig. 1.
Detailed Description
Embodiments of the present utility model are described in detail below with reference to fig. 1-2.
The self-lubricating differential mechanism casing sets up on the differential mechanism casing internal sphere and fills up corresponding ball and fill up lubrication groove 1 with the planetary gear ball, its characterized in that: the ball pad lubrication groove 1 is oval in shape and is formed in the periphery of the planetary gear shaft hole 2, the long axis direction of the ball pad lubrication groove 1 is consistent with the rotation direction of the differential shell, the long axis of the ball pad lubrication groove 1 is larger than the diameter of the outer circle of the ball pad of the planetary gear, the short axis of the ball pad lubrication groove 1 is smaller than the diameter of the outer circle of the ball pad of the planetary gear, and the adjacent ball pad lubrication grooves 1 are communicated through the oil duct 3.
The self-lubricating differential mechanism comprises a self-lubricating differential mechanism shell, wherein a spherical gasket lubricating oil groove 1 is formed in the self-lubricating differential mechanism shell, the spherical gasket lubricating oil groove 1 is formed in the periphery of a planetary gear shaft hole 2 and is in an elliptical shape, the outer spherical surface of the planetary gear spherical gasket is matched with the inner spherical surface of the differential mechanism, the spherical gasket lubricating oil groove 1 is just positioned on the outer spherical surface of the planetary gear spherical gasket, the long shaft end part of the spherical gasket lubricating oil groove 1 extends out of the outer spherical surface of the planetary gear spherical gasket, the centrifugal force generated during rotation of the differential mechanism shell is utilized to promote lubricating oil to flow between the inner spherical gasket lubricating oil groove 1 and the adjacent spherical gasket lubricating groove 1, lubricating oil between the inner spherical surface of the differential mechanism shell and the outer spherical surface of the planetary gear spherical gasket is smooth, the flowing lubricating oil takes away heat generated during friction between the outer spherical surface of the planetary gear spherical gasket and the inner spherical surface of the differential mechanism shell, the elliptical shape characteristic of the spherical gasket lubricating oil groove 1 is avoided, the outer spherical surface of the planetary gear spherical gasket can be contacted with the elliptical oil groove from inside to outside when the planetary gear spherical gasket rotates around a planetary gear, the friction pair between the outer spherical surface of the planetary gear spherical gasket and the inner spherical surface of the differential mechanism shell can obtain sufficient lubrication, and the differential mechanism wear rate of the inner spherical surface of the differential mechanism is reduced.
The number of the ball pad lubrication grooves 1 is four, each ball pad lubrication groove 1 is concentric with the corresponding planetary gear shaft hole 2, and the oil duct 3 is formed along the rotation direction of the differential shell. When the planetary gear shaft is the cross axle, offer on the differential mechanism casing and the corresponding four planetary gear shaft holes of cross axle, every planetary gear shaft hole periphery is offered a ball and is filled up lubrication groove 1, ball is filled up lubrication groove 1 and is oval and concentric with corresponding planetary gear shaft hole 2 and set up, with oil duct 3 UNICOM between the adjacent ball is filled up lubrication groove 1, oil duct 3 offers along differential mechanism casing direction of rotation, when the differential mechanism casing rotates, lubricating oil flows in oil duct 3, form lubricating oil and smoothly flow between ball is filled up lubrication groove 1, guarantee that the oil mass of every ball is filled up lubrication groove 1 evenly, fully, guarantee the even lubrication to every planetary gear ball pad outer sphere.
The depth of each of the ball pad lubricating oil groove 1 and the oil duct 3 is 1-2 mm, the long axis of each ball pad lubricating oil groove 1 is larger than the diameter of the outer circle of each planetary gear ball pad by 2-3 mm, the short axis is larger than the diameter of each planetary gear shaft hole by 2-3 mm, each planetary gear ball pad cannot sink into each ball pad lubricating oil groove 1 when the outer spherical surface of each planetary gear ball pad is matched with the inner spherical surface of the differential mechanism shell, the long axis end of each ball pad lubricating oil groove 1 extends out of each planetary gear ball pad, each planetary gear ball pad rotates relative to each ball pad lubricating groove 1 when rotating around a planetary gear shaft, each planetary gear ball pad outer spherical surface contacts with oil in each ball pad groove 1 when rotating, an integral oil film is formed, lubricating effect is improved, and abrasion of each inner spherical surface of the differential mechanism is reduced.
Wherein, oil duct 3 constitute by the bar oil duct 4 of seting up along differential mechanism casing direction of rotation and the oil storage groove 5 of two bar oil ducts 4 of UNICOM, the ball pad lubrication groove 1 UNICOM of bar oil duct 4 one end, the other end and the oil storage groove 5 UNICOM, the width of oil storage groove 5 is greater than the width of bar oil duct 4, length is less than the length of bar oil groove 4. The width of the oil storage groove 5 is larger than that of the strip oil opening channel 4, so that lubricating oil flowing out of the ball pad lubricating oil groove 1 and the inner wall of the differential shell can be stored, and the ball pad lubricating oil groove 1 can be supplemented with lubricating oil, so that the friction pair between the outer spherical surface of the ball pad of the planet gear and the inner spherical surface of the differential shell is fully lubricated.
The oil storage groove 5 is a square oil groove, the width of the oil storage groove 5 is smaller than the short axis of the ball pad lubrication groove 1, and the width of the strip-shaped oil groove 4 is 3-4 mm. The square oil groove is simpler to mold, the width of the oil storage groove 5 is smaller than the short shaft of the ball pad lubrication groove 1, so that the oil storage groove of the oil storage groove 5 is moderate, the oil storage groove 5 can store a certain amount of oil and can not reduce the flow speed of the oil in the oil duct 3 due to overlarge oil storage, the flow speed of the oil in the oil duct 3 is ensured, and the lubrication effect is improved.
The foregoing disclosure of embodiments of the present utility model has been fully described with reference to the accompanying drawings, in which it is to be understood that the embodiments described are merely some of the embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Claims (5)
1. The self-lubricating differential mechanism casing sets up the ball pad lubrication groove corresponding with planetary gear ball pad on the differential mechanism casing internal sphere, its characterized in that: the ball pad lubrication groove is elliptical and is arranged at the periphery of the planetary gear shaft hole, the long axis direction of the ball pad lubrication groove is consistent with the rotation direction of the differential shell, the long axis of the ball pad lubrication groove is larger than the diameter of the outer circle of the planetary gear ball pad, and the short axis of the ball pad lubrication groove is smaller than the diameter of the outer circle of the planetary gear ball pad.
2. The self-lubricating differential housing as defined in claim 1, wherein: the number of the ball pad lubrication grooves is four, each ball pad lubrication groove is concentric with the corresponding planetary gear shaft hole, and the oil duct is formed along the rotation direction of the differential shell.
3. The self-lubricating differential housing as defined in claim 1, wherein: the depth of the ball pad lubricating oil groove and the depth of the oil duct are 1-2 mm, the long axis of the ball pad lubricating oil groove is larger than the diameter of the outer circle of the ball pad of the planet gear by 2-3 mm, and the short axis is larger than the diameter of the shaft hole of the planet gear by 2-3 mm.
4. The self-lubricating differential housing as defined in claim 3, wherein: the oil duct constitute by the bar oil duct of seting up along differential mechanism casing direction of rotation and the oil storage groove of two bar oil ducts of UNICOM, bar oil duct one end ball pad lubrication groove UNICOM, the other end and the oil storage groove UNICOM, the width of oil storage groove is greater than the width of bar oil duct, length is less than the length of bar oil groove.
5. The self-lubricating differential housing as defined in claim 4, wherein: the oil storage groove is a square oil groove, the width of the oil storage groove is smaller than the short axis of the ball pad lubricating oil groove, and the width of the strip-shaped oil groove is 3-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321812408.XU CN220581634U (en) | 2023-07-11 | 2023-07-11 | Self-lubricating differential mechanism shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321812408.XU CN220581634U (en) | 2023-07-11 | 2023-07-11 | Self-lubricating differential mechanism shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220581634U true CN220581634U (en) | 2024-03-12 |
Family
ID=90119016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321812408.XU Active CN220581634U (en) | 2023-07-11 | 2023-07-11 | Self-lubricating differential mechanism shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220581634U (en) |
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2023
- 2023-07-11 CN CN202321812408.XU patent/CN220581634U/en active Active
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