Differential mechanism, internal transmission and external transmission full-oil-injection circulating lubricating device

Abstract

The utility model relates to the technical field of differential lubrication, and discloses a differential, inner transmission and outer transmission full-oil-injection circulating lubrication device which comprises a differential base, a differential installation frame is arranged at the bottom end of the differential base, and a differential installation cover is arranged on the side edge of the differential base. The central lubricating oil pipe penetrates through the middle of the differential input shaft and extends into the transmission shaft and the spiral supporting shaft, and lubricating oil is conveyed into the lateral oil outlet hole through the central lubricating oil pipe. The lateral oil outlet hole sequentially conveys the lubricating oil to the moving end bearing and the fixed end bearing, so that lubrication between the bearings is achieved, lubricating oil containing impurities is effectively prevented from flowing back into the differential mechanism base again, the impurities are prevented from being deposited in the differential mechanism base, and a certain safety guarantee is provided for operation of a differential mechanism.

Description

Technical Field

[0001] This utility model relates to the field of differential lubrication technology, specifically to a differential, internal transmission, and external transmission fully oil-injected circulating lubrication device. Background Technology

[0002] In modern mechanical transmission systems, the differential, as a key component, is widely used in automobiles, construction machinery, and many other fields. Its main function is to ensure that the left and right drive wheels can rotate at different speeds when the vehicle is turning or driving on uneven roads, thus achieving smooth vehicle operation. The differential has a complex internal structure, containing multiple meshing gears, such as planetary gears and half-shaft gears. These gears operate at high speeds continuously during operation, inevitably generating a large amount of friction and heat.

[0003] Existing differentials primarily rely on splash lubrication, lacking a central lubrication path. Internal shaft lubrication often uses grease, not circulating oil. Furthermore, older centrally lubricated differentials (including involute planetary differentials and cycloidal differentials) typically introduce oil through the input shaft's central hole (connected by a rotary joint). The lubricating oil enters the differential through the central hole of the output shaft, lubricating the gears and bearings, and then flows out through the output shaft's central hole, lubricating the internal drive shaft bearings via the lubrication path on the central shaft. This fails to address the issue of contaminated lubricating oil passing through the differential, where centrifugal force causes contaminants to accumulate inside the differential housing, accelerating differential damage. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fully oil-injected circulating lubrication device for differentials, internal transmissions, and external transmissions. This solves the problem that existing differentials primarily rely on splash lubrication without a central lubrication path. Furthermore, the internal shaft lubrication often uses grease lubrication instead of circulating oil lubrication. In older, centrally lubricated differentials (including involute planetary differentials and cycloidal differentials), oil typically enters through the input shaft center hole (connected by a rotary joint), lubricating the differential gears and bearings, and then flows out through the output shaft center hole, lubricating the internal transmission shaft bearings through the lubrication path on the central shaft. This fails to address the issue of contaminated lubricating oil depositing within the differential housing under centrifugal force, accelerating differential damage.

[0005] This utility model provides the following technical solution: a differential, internal transmission, and external transmission fully oil-injected circulating lubrication device, including a differential base, a differential mounting bracket at the bottom of the differential base, a differential mounting cover on the side of the differential base, a differential input shaft on the side of the differential base, an inner shaft and an outer shaft inside the differential base, and a central lubricating oil pipe inserted in the middle of the differential input shaft.

[0006] The outer shaft consists of a left half-shaft and a right half-shaft, and the inner shaft consists of a fixed end bearing and a floating end bearing. The fixed end bearing is installed between the left half-shaft and the right half-shaft. A drive shaft is provided in the middle of the differential housing, and a helical support shaft is provided at the end of the drive shaft. A lateral oil outlet is provided between the helical support shaft and the right half-shaft. The lateral oil outlet connects the floating end bearing and the fixed end bearing. The drive shaft and the helical support shaft are connected by a rotary sealing shaft. Two housing oil return chambers are symmetrically arranged on the upper and lower sides of the differential housing. A first outer shaft bearing is provided on the outer side of the left half-shaft, and a second outer shaft bearing is provided on the outer side of the right half-shaft. Two lateral oil injection pipes are symmetrically arranged on the top side of the housing oil return chamber.

[0007] Preferred technical solution 1: The drive shaft and the spiral support shaft are connected by a spline.

[0008] Preferred technical solution 2: The differential input shaft and the left half shaft are connected by a number of evenly arranged bolts.

[0009] Preferred technical solution 3: An oil drain pipe is provided on the oil return chamber of the base on the bottom side.

[0010] Preferred technical solution four: The left half-shaft is connected to the differential housing via the first outer shaft bearing.

[0011] Preferred technical solution five: The right half-shaft is connected to the differential housing via the second outer shaft bearing.

[0012] Compared with the prior art, this utility model provides a differential, internal transmission, and external transmission fully oil-injected circulating lubrication device, which has the following beneficial effects:

[0013] (1) This utility model passes through the middle of the input shaft of the differential and extends to the drive shaft and the screw support shaft. The lubricating oil is delivered to the side oil outlet through the central lubricating oil pipe. The side oil outlet delivers the lubricating oil to the floating end bearing and the fixed end bearing in sequence, thereby achieving lubrication between the bearings. The lubricating oil enters the oil return chamber of the base through the drain hole and is stored there. This effectively prevents the lubricating oil containing impurities from flowing back into the differential base and avoids the accumulation of impurities in the differential base, thus providing a certain safety guarantee for the operation of the differential. Attached Figure Description

[0014] Figure 1 is a three-dimensional structural schematic diagram of this utility model;

[0015] Figure 2 is a schematic diagram of the internal cross-section of the structure of this utility model;

[0016] Figure 3 is a schematic diagram of the floating end bearing in Figure 2 of this utility model;

[0017] Figure 4 is an enlarged view of the second outer shaft bearing structure in Figure 2 of this utility model.

[0018] In the diagram: 100, differential housing; 200, differential mounting bracket; 300, differential mounting cover; 400, center lubrication oil pipe;

[0019] 1. Differential input shaft; 2. Left half shaft; 3. Fixed end bearing; 4. Right half shaft; 5. Floating end bearing; 6. Drive shaft; 7. Helical support shaft; 8. Lateral oil outlet; 9. Rotary seal shaft; 10. Engine base oil return chamber; 11. First outer shaft bearing; 12. Second outer shaft bearing; 13. Lateral oil injection pipe. Detailed Implementation

[0020] Please refer to Figure 1-4.

[0021] Example 1: A differential, internal drive, and external drive fully oil-injected circulating lubrication device includes a differential base 100, a differential mounting bracket 200 at the bottom of the differential base 100, a differential mounting cover 300 on the side of the differential base 100, a differential input shaft 1 on the side of the differential base 100, an inner shaft and an outer shaft inside the differential base 100, and a central lubricating oil pipe 400 inserted in the middle of the differential input shaft 1.

[0022] The outer shaft consists of a left half shaft 2 and a right half shaft 4, and the inner shaft consists of a fixed end bearing 3 and a floating end bearing 5. The fixed end bearing 3 is installed between the left half shaft 2 and the right half shaft 4. A drive shaft 6 is provided in the middle of the differential base 100, and a helical support shaft 7 is provided at the end of the drive shaft 6.

[0023] A lateral oil outlet 8 is provided between the spiral support shaft 7 and the right half shaft 4. The lateral oil outlet 8 connects the floating end bearing 5 and the fixed end bearing 3. The drive shaft 6 and the spiral support shaft 7 are connected by a rotary sealing shaft 9. Two base oil return chambers 10 are symmetrically arranged on the upper and lower sides of the differential base 100. A first outer shaft bearing 11 is provided on the outer side of the left half shaft 2, and a second outer shaft bearing 12 is provided on the outer side of the right half shaft 4. Two lateral oil injection pipes 13 are symmetrically arranged on the top base oil return chamber 10.

[0024] The drive shaft 6 and the spiral support shaft 7 are connected by a spline.

[0025] The differential input shaft 1 and the left half shaft 2 are connected by a number of evenly spaced bolts.

[0026] Example 2: The difference between this example and Example 1 is that an oil drain pipe is provided on the bottom side base oil return chamber 10.

[0027] Example 3: The difference between this example and Example 1 is that the left half shaft 2 and the differential housing 100 are connected by the first outer shaft bearing 11.

[0028] Example 4: The difference between this example and Example 1 is that the right half shaft 4 and the differential housing 100 are connected by the second outer shaft bearing 12.

[0029] In this embodiment, since the existing differential lubrication method is mainly splash lubrication and there is no central lubrication oil passage, the lubrication of the inner shaft is mostly grease lubrication and cannot be circulated oil lubrication. Moreover, the old central lubrication differentials, including involute planetary differentials and cycloidal differentials, generally connect the oil inlet through the rotary joint of the input shaft center hole. The lubricating oil enters the differential to lubricate the differential gears and bearings, and then flows out through the output shaft center hole and lubricates the inner drive shaft bearings through the lubrication oil passage on the central shaft. This cannot solve the problem that contaminated lubricating oil passes through the differential and, under the action of centrifugal force, contaminants are deposited in the differential housing, which accelerates the damage of the differential.

[0030] In summary, in practical implementation, this scheme uses a central lubricating oil pipe 400 that runs through the middle of the differential input shaft 1 to the center of the drive shaft 6 and the helical support shaft 7, indicating that the lubricating oil passes through the middle of the differential. The central lubricating oil pipe 400 extends out at the floating end bearing 5, and the two rotate relative to each other. They are sealed by the fixed end bearing 3. The seal is not limited to O-rings, skeleton oil seals, plug seals, etc. When the length-to-diameter ratio of the central lubricating oil pipe 400 is large, a guide slip ring can be installed on the central lubricating oil pipe 400 to stabilize the stability of the central lubricating oil pipe 400 in the differential input shaft 1.

[0031] Furthermore, the transmission system uses the aforementioned differential to supply oil to the inner shaft bearings, including the fixed end bearing 3 and the floating end bearing 5, for circulating oil lubrication.

[0032] The outer shaft of the transmission system is divided into two parts: the left half shaft 2 and the right half shaft 4, with the fixed end bearing 3 installed between the two.

[0033] The inner shaft can be divided into a drive shaft 6 and a spiral support shaft 7, which are connected by a spline, or they can be designed as one piece.

[0034] The left end of the spiral support shaft 7 is fixed by the fixed end bearing 3.

[0035] The drive shaft 6 and the differential input shaft 1 are also connected by a spline.

[0036] The drive shaft 6, the spiral support shaft 7, and the central lubrication oil pipe 400 are sealed by a rotary seal shaft 9, which is the same as the sealing between the central lubrication oil pipe 400 and the output shaft in the differential.

[0037] The lubricating oil in the center hole flows to the floating end bearing 5 through the side oil outlet 8 for lubrication. The fixed end bearing 3 can be lubricated in the same way, flowing from the floating end bearing 5 to the fixed end bearing 3.

[0038] The lubricating oil is finally discharged from the oil drain holes on the left half shaft 2 and the right half shaft 4 into the oil return chamber 10 of the machine base.

[0039] The first outer shaft bearing 11 and the second outer shaft bearing 12 are lubricated by another side oil injection pipe 13, and the lubricated oil is also in the oil return chamber 10 of the machine base.

Claims

1. A differential, internal drive, and external drive fully oil-injected circulating lubrication device, comprising a differential housing (100), characterized in that: The differential mount (100) is provided with a differential mounting bracket (200) at the bottom end, a differential mounting cover (300) is provided on the side of the differential mount (100), a differential input shaft (1) is provided on the side of the differential mount (100), an inner shaft and an outer shaft are provided inside the differential mount (100), and a central lubricating oil pipe (400) is inserted in the middle of the differential input shaft (1). The outer shaft consists of a left half-shaft (2) and a right half-shaft (4), and the inner shaft consists of a fixed end bearing (3) and a floating end bearing (5). The fixed end bearing (3) is installed between the left half-shaft (2) and the right half-shaft (4). A drive shaft (6) is provided in the middle of the differential housing (100), and a helical support shaft (7) is provided at the end of the drive shaft (6). A lateral oil outlet (8) is provided between the helical support shaft (7) and the right half-shaft (4). The lateral oil outlet (8) drains the oil from the inner shaft. The floating end bearing (5) and the fixed end bearing (3) are connected. The drive shaft (6) and the spiral support shaft (7) are connected by a rotating sealing shaft (9). Two base oil return chambers (10) are symmetrically arranged on the upper and lower sides of the differential base (100). A first outer shaft bearing (11) is arranged on the outer side of the left half shaft (2), and a second outer shaft bearing (12) is arranged on the outer side of the right half shaft (4). Two side oil injection pipes (13) are symmetrically arranged on the top side of the base oil return chamber (10).

2. The differential, internal transmission, and external transmission fully oil-injected circulating lubrication device according to claim 1, characterized in that: The drive shaft (6) and the spiral support shaft (7) are connected by a spline.

3. The differential, internal transmission, and external transmission fully oil-injected circulating lubrication device according to claim 2, characterized in that: The differential input shaft (1) is connected to the left half shaft (2) by a number of evenly arranged bolts.

4. A differential, internal transmission, and external transmission fully oil-injected circulating lubrication device according to claim 3, characterized in that: An oil drain pipe is provided on the oil return chamber (10) of the base on the bottom side.

5. A differential, internal transmission, and external transmission fully oil-injected circulating lubrication device according to claim 4, characterized in that: The left half-shaft (2) is connected to the differential housing (100) via the first outer shaft bearing (11).

6. A differential, internal transmission, and external transmission fully oil-injected circulating lubrication device according to claim 5, characterized in that: The right half-shaft (4) is connected to the differential housing (100) via the second outer shaft bearing (12).

Images