Differential lubricating structure and gearbox
By introducing an oil baffle and oil collection chamber structure into the differential, the problem of insufficient differential lubrication is solved, achieving efficient lubrication of the differential, reducing the risk of burning and abnormal noise, and featuring a compact structure and low cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2026-04-07
AI Technical Summary
In the existing differential lubrication structure, insufficient oil quantity leads to inadequate lubrication of the planetary gear half-shaft and planetary half-shaft bevel gear, which can easily cause burning and galling problems.
It adopts an oil baffle structure, and the oil collection chamber is designed to be isolated from the differential bearing. The oil is effectively distributed through through holes and connecting holes, ensuring sufficient lubrication of the differential bearing, planetary gear half shaft and planetary half shaft bevel gear.
It improves the lubrication effect of the differential, reduces the risk of failure such as planetary pin erosion and abnormal noise during turning, and has a compact structure, low cost, and is easy to mass-produce.
Smart Images
Figure CN224093803U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of differential structure, and in particular to a differential lubrication structure and a transmission. Background Technology
[0002] The differential in a speed reducer is a key component of a car's transmission system. When the vehicle turns, the differential allows the left and right wheels to rotate at different speeds. The differential is typically lubricated by churning or active lubrication, with oil entering the planetary gear helix through oil grooves at the ends of the planetary gears to lubricate the half-shafts, planetary gears, and planetary half-shaft bevel gears.
[0003] In a conventional differential lubrication system, sufficient oil volume is required for oil to enter through the end face oil collection groove and spiral line. When the oil volume is relatively low, most of the oil entering the differential bearing will be directly discharged through the differential bearing, resulting in insufficient or no lubrication of the planetary gear half-shafts and planetary half-shaft bevel gears. This can lead to pitting and seizing of the planetary gear half-shafts, and even differential burn-out. Utility Model Content
[0004] The purpose of this application is to provide a differential lubrication structure and a transmission to solve the problem of insufficient lubrication caused by insufficient oil intake in the differential transmission mechanism or insufficient oil intake compared to the oil unloaded from the differential bearing.
[0005] This application provides a differential lubrication structure, which is installed in the gearbox housing, and the differential lubrication structure includes an oil baffle plate;
[0006] The oil baffle is installed inside the gearbox housing. One side of the oil baffle, together with the gearbox housing and the drive shaft, forms an oil collection chamber, and the other side of the oil baffle is opposite to the differential bearing.
[0007] The oil baffle is provided with a through hole, through which the differential housing passes; the oil baffle is provided with a connecting hole, through which the oil in the oil collection chamber flows to the differential bearing.
[0008] In the above technical solution, the gearbox housing is further provided with an oil inlet, which is located on the side of the oil baffle away from the differential bearing, and the oil inlet is connected to the oil collection chamber.
[0009] In the above technical solution, the through hole is further located in the middle of the oil baffle plate;
[0010] The oil baffle is provided with multiple connecting holes, and the multiple connecting holes are evenly distributed around the through hole.
[0011] In the above technical solution, the oil baffle further includes an oil baffle ring and a positioning edge;
[0012] The oil baffle ring is provided with the through hole and the communicating hole;
[0013] The oil baffle ring has a positioning edge on the side facing the differential bearing; the positioning edge fits against the end face of the differential bearing; the oil baffle ring, the positioning edge, and the differential bearing form a receiving cavity.
[0014] In the above technical solution, the oil baffle ring is further defined as an annular shape, and the inner ring of the oil baffle ring forms the through hole; the positioning edge surrounds the outer periphery of the oil baffle ring.
[0015] In the above technical solution, the oil baffle plate is further configured to be interference-fitted with the gearbox housing.
[0016] The above technical solution further includes an oil seal;
[0017] The oil seal is located on the side of the oil baffle away from the differential bearing, and the oil seal is sleeved on the drive shaft; the oil seal, the oil baffle, the gearbox housing and the drive shaft surround and form the oil collection chamber.
[0018] In the above technical solution, an oil guide groove is further provided between the differential housing and the drive shaft;
[0019] One end of the oil guide groove is connected to the inner cavity of the differential housing; the other end of the oil guide groove is connected to the oil collection chamber, so that the oil in the oil collection chamber overflows into the oil guide groove.
[0020] In the above technical solution, the differential housing is further provided with the oil guide groove, and the oil guide groove has a spiral oil flow path.
[0021] This application also provides a transmission including the differential lubrication structure described above.
[0022] Compared with the prior art, the beneficial effects of this application are as follows:
[0023] The differential lubrication structure provided in this application solves the problem of insufficient lubrication caused by insufficient oil intake in the differential transmission mechanism or insufficient oil intake compared to the oil discharge from the differential bearing. It reduces the risk of differential failure such as planetary pin erosion and abnormal noise during turning. It features a compact structure, good lubrication effect, simple manufacturing method, low cost, and easy mass production.
[0024] This application also provides a transmission, including the differential lubrication structure described in the above solution. Based on the above analysis, it is clear that the transmission also possesses the aforementioned beneficial effects, which will not be elaborated upon further here. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a structural schematic diagram of the gearbox provided in this application;
[0027] Figure 2 This is a first schematic diagram of the differential lubrication structure provided in this application;
[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0029] Figure 4 This is a second schematic diagram of the differential lubrication structure provided in this application;
[0030] Figure 5 A first structural schematic diagram of the oil baffle provided in this application;
[0031] Figure 6 This is a schematic diagram of the second structure of the oil baffle provided in this application.
[0032] In the diagram: 101-Gearbox housing; 102-Oil baffle plate; 103-Drive shaft; 104-Oil collection chamber; 105-Differential bearing; 106-Through hole; 107-Connecting hole; 108-Oil inlet; 109-Oil baffle ring; 110-Positioning edge; 111-Oil seal; 112-Oil guide groove; 113-Differential housing. Detailed Implementation
[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0035] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0036] Example 1
[0037] See Figures 1 to 6 As shown, the differential lubrication structure provided in this application is installed in the gearbox housing 101. The differential lubrication structure includes an oil baffle 102. The oil baffle 102 is installed inside the gearbox housing 101. One side of the oil baffle 102, together with the gearbox housing 101 and the drive shaft 103, forms an oil collecting chamber 104. The other side of the oil baffle 102 is opposite to the differential bearing 105. The oil baffle 102 is provided with a through hole 106, through which the end of the differential housing 113 passes, so that the arrangement of the oil baffle 102 does not affect the operation of the differential.
[0038] In other words, the oil baffle 102 can isolate the oil from the differential bearing 105, preventing a large amount of oil from being directly discharged by the differential bearing 105, so that more oil can be stored in the oil collection chamber 104. The oil collection chamber 104 stores more oil, resulting in more oil lubricating the planetary gear half-shaft (i.e., drive shaft 103) and planetary half-shaft bevel gears of the differential, thereby improving the lubrication effect on these parts.
[0039] Furthermore, to provide lubrication for the differential bearing 105, the oil baffle 102 has a connecting hole 107, through which oil in the oil collecting chamber 104 can flow to the differential bearing 105. Since the amount of oil required to lubricate the differential bearing 105 is relatively small, a smaller connecting hole 107 is provided on the oil baffle 102 to allow a small portion of oil to enter the differential bearing 105 for lubrication. The oil collecting chamber 104 loses less oil, thus requiring less oil to lubricate the differential transmission mechanism without affecting the lubrication of the planetary gear half-shafts and planetary half-shaft bevel gears.
[0040] The differential lubrication structure provided in this application solves the problem of insufficient lubrication caused by insufficient oil intake in the differential transmission mechanism or insufficient oil intake compared to the oil unloading of the differential bearing 105. It reduces the risk of differential failure such as planetary pin erosion and abnormal noise during turning. It features a compact structure, good lubrication effect, simple manufacturing method, low cost, and easy mass production.
[0041] In an optional embodiment, the gearbox housing 101 is provided with an oil inlet 108, which is located on the side of the oil baffle 102 away from the differential bearing 105, and the oil inlet 108 is connected to the oil collection chamber 104.
[0042] In this embodiment, oil can continuously enter the oil collection chamber 104 from the oil inlet 108, and the flow rate of the oil entering the oil collection chamber 104 from the oil inlet 108 is greater than the flow rate of the oil flowing from the connecting hole 107 to the differential bearing 105. At this time, the oil in the oil collection chamber 104 will overflow to the differential transmission mechanism, thereby lubricating the various components of the differential transmission mechanism and reducing the risk of differential failure such as planetary pin erosion and abnormal noise during turning.
[0043] In the optional solutions of this embodiment, such as Figures 4 to 6 As shown, the through hole 106 is located in the middle of the oil baffle 102; the oil baffle 102 is provided with a plurality of connecting holes 107, and the plurality of connecting holes 107 are evenly distributed around the through hole 106.
[0044] In this embodiment, by evenly distributing multiple connecting holes 107 around the through hole 106, the oil in the oil collecting chamber 104 can flow into the area where the differential bearing 105 is located from multiple directions. This results in high lubrication efficiency for the differential bearing 105, ensuring uniform oil distribution and preventing localized insufficient lubrication of the differential bearing 105. Furthermore, the multi-point distribution of connecting holes 107 can cover a wider area, reducing dead zones in lubricant flow and improving the comprehensiveness and effectiveness of lubrication.
[0045] In an optional embodiment, the oil baffle 102 includes an oil baffle ring 109 and a positioning edge 110. The oil baffle ring 109 has a through hole 106 and a connecting hole 107. The positioning edge 110 is provided on the side of the oil baffle ring 109 facing the differential bearing 105. The positioning edge 110 fits against the end face of the differential bearing 105 to ensure that the oil baffle 102 can be accurately positioned during installation. The oil baffle ring 109, the positioning edge 110, and the differential bearing 105 form a receiving cavity, providing a centralized storage and flow space for the oil. The oil in the oil collecting chamber 104 is introduced into the receiving cavity through the connecting hole 107, and then evenly distributed to various parts of the differential bearing 105 to ensure complete coverage of the differential bearing 105.
[0046] In an optional embodiment, the oil baffle ring 109 is annular, with a through hole 106 formed in its inner ring to allow the end of the differential housing 113 to pass through. The outer periphery of the oil baffle ring 109 is adapted to the inner wall of the gearbox housing 101 to block the oil in the oil collecting chamber 104. A positioning edge 110 surrounds the outer periphery of the oil baffle ring 109, and the positioning edge 110 is positioned opposite to the outer ring of the differential bearing 105. That is, the gearbox housing 101, the oil baffle plate, and the outer ring of the differential bearing 105 all remain stationary.
[0047] In this embodiment, the oil baffle 102 is interference-fitted with the gearbox housing 101 to achieve the installation and fixation of the oil baffle 102. This structure does not require additional connecting parts, which can reduce the size of the device.
[0048] In the optional solutions of this embodiment, such as Figure 2 and Figure 3 As shown, the differential lubrication structure also includes an oil seal 111; the oil seal 111 is located on the side of the oil baffle 102 away from the differential bearing 105, and the oil seal 111 is sleeved on the drive shaft 103; the oil seal 111, the oil baffle 102, the gearbox housing 101, and the drive shaft 103 together form an oil collecting chamber 104. The oil seal 111 effectively prevents lubricating oil from leaking from the oil collecting chamber 104 to the outside, improving the sealing performance of the entire lubrication system.
[0049] Example 2
[0050] The differential lubrication structure in this second embodiment is an improvement on the above embodiments. The technical content disclosed in the above embodiments will not be described again, and the content disclosed in the above embodiments also belongs to the content disclosed in this second embodiment.
[0051] See Figure 3As shown, in an optional embodiment, an oil guide groove 112 is provided between the differential housing 113 and the drive shaft 103; one end of the oil guide groove 112 is connected to the inner cavity of the differential housing 113; the other end of the oil guide groove 112 is connected to the oil collecting chamber 104, so that the oil in the oil collecting chamber 104 overflows into the oil guide groove 112.
[0052] In this embodiment, the differential housing 113 is provided with mounting holes for mounting the drive shaft 103, and the drive shaft 103 extends into the inner cavity of the differential housing 113. Since the oil collecting chamber 104 stores a large amount of oil, sufficient oil can be ensured to enter the oil guide groove 112. When the oil flows along the oil guide groove 112, it lubricates the drive shaft 103 by passing through it. Furthermore, the oil can flow into the inner cavity of the differential housing 113 to lubricate the gears.
[0053] In an optional embodiment, the differential housing 113 is provided with an oil guide groove 112, and the oil guide groove 112 has a spiral oil flow path.
[0054] In this embodiment, when the oil flows along the oil guide groove 112, its spiral oil flow path allows the oil to be more evenly distributed around the drive shaft 103, ensuring that all positions of the drive shaft 103 are adequately lubricated. Furthermore, the longer flow path of the oil results in a larger contact area between the oil and the drive shaft 103, thereby improving the lubrication effect on the drive shaft 103.
[0055] Example 3
[0056] Embodiment 3 of this application provides a gearbox that includes the differential lubrication structure of any of the above embodiments, and thus has all the beneficial technical effects of the differential lubrication structure of any of the above embodiments, which will not be repeated here.
[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments.
Claims
1. A differential lubrication structure, installed in a gearbox housing, characterized in that, The differential lubrication structure includes an oil baffle plate; The oil baffle is installed inside the gearbox housing. One side of the oil baffle, together with the gearbox housing and the drive shaft, forms an oil collection chamber, and the other side of the oil baffle is opposite to the differential bearing. The oil baffle is provided with a through hole, through which the differential housing passes; the oil baffle is provided with a connecting hole, through which the oil in the oil collection chamber flows to the differential bearing.
2. The differential lubrication structure according to claim 1, characterized in that, The gearbox housing is provided with an oil inlet, which is located on the side of the oil baffle away from the differential bearing, and the oil inlet is connected to the oil collection chamber.
3. The differential lubrication structure according to claim 2, characterized in that, The through hole is located in the middle of the oil baffle plate; The oil baffle is provided with multiple connecting holes, and the multiple connecting holes are evenly distributed around the through hole.
4. The differential lubrication structure according to claim 1, characterized in that, The oil baffle plate includes an oil baffle ring and a positioning edge; The oil baffle ring is provided with the through hole and the communicating hole; The oil baffle ring has a positioning edge on the side facing the differential bearing; the positioning edge fits against the end face of the differential bearing; the oil baffle ring, the positioning edge, and the differential bearing form a receiving cavity.
5. The differential lubrication structure according to claim 4, characterized in that, The oil baffle ring is circular, and the inner ring of the oil baffle ring forms the through hole; the positioning edge surrounds the outer periphery of the oil baffle ring.
6. The differential lubrication structure according to claim 1, characterized in that, The oil baffle plate is interference-fitted with the gearbox housing.
7. The differential lubrication structure according to claim 1, characterized in that, It also includes oil seals; The oil seal is located on the side of the oil baffle away from the differential bearing, and the oil seal is sleeved on the drive shaft; the oil seal, the oil baffle, the gearbox housing and the drive shaft surround and form the oil collection chamber.
8. The differential lubrication structure according to claim 1, characterized in that, An oil guide groove is provided between the differential housing and the drive shaft; One end of the oil guide groove is connected to the inner cavity of the differential housing; the other end of the oil guide groove is connected to the oil collection chamber, so that the oil in the oil collection chamber overflows into the oil guide groove.
9. The differential lubrication structure according to claim 8, characterized in that, The differential housing has an oil guide groove, and the oil guide groove has a spiral oil flow path.
10. A gearbox, characterized in that, Includes a differential lubrication structure as described in any one of claims 1 to 9.