Differential structure matched with active lubrication type electric drive axle

Abstract

The utility model discloses a differential mechanism structure matched with an active lubrication type electric drive axle. The differential mechanism structure is composed of a gearbox shell, a bearing cover, a differential mechanism shell, a differential mechanism bearing, an oil baffle disc and a differential mechanism gear. The bearing cover is connected with the gearbox shell; the differential mechanism shell is connected with the differential mechanism bearing; the differential bearing is connected with the gearbox shell and the bearing cover; the oil baffle disc is connected with the differential mechanism shell; the lubricating device has the advantages of being reliable in lubrication, reducing oil adding amount, reducing oil stirring energy loss and improving transmission efficiency. The differential mechanism is suitable for the electrically-driven axle gearbox differential mechanism using active lubrication.

Description

Technical Field

[0001] This utility model relates to the field of vehicle axle technology, specifically a differential structure adapted to an actively lubricated electric drive axle, suitable for electric drive axle differentials using active lubrication. Background Technology

[0002] With the development of electric drive axle technology, the use of electronic or mechanical oil pumps for active lubrication of gearbox bearings and gears has become a trend. With active lubrication, the lubrication of gears and bearings no longer relies on splash lubrication by agitating the gear oil through the rotation of parts. In order to reduce weight, reduce oil agitation losses, improve transmission efficiency, and reduce temperature rise, gearboxes using active lubrication use less oil and have lower oil levels. Since the differential bearings and gears are enclosed in the housing and rotate continuously, active lubrication can only spray the lubricating oil onto the surface of the housing. The lubricating oil is difficult to flow into the cavity, and the differential gears and bearings cannot be effectively lubricated, which can easily lead to burning due to poor lubrication. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a differential structure that is compatible with an active lubrication electric drive axle.

[0004] The technical solution provided by this utility model is: a differential structure adapted to an actively lubricated electric drive axle, characterized in that it comprises a gearbox housing, a bearing cover, a differential housing, a differential bearing, an oil baffle, and a differential gear; the bearing cover and the gearbox housing are fixedly connected; the inner ring of the differential bearing is connected to the differential housing, and the outer ring of the differential bearing is connected to the gearbox housing and the bearing cover assembly; the differential housing rotates relative to the gearbox housing and the bearing cover via the differential bearing; the oil baffle is press-fitted onto the differential housing, and a differential gear is disposed in the inner cavity of the differential housing; the oil baffle and the differential gear rotate together with the differential housing.

[0005] The gearbox housing is provided with a gearbox housing oil hole, which can transmit lubricating oil supplied by the active lubrication pump; the bearing cover is provided with a bearing cover oil groove and a bearing cover oil passage. The bearing cover oil groove receives the lubricating oil transmitted from the gearbox housing oil hole, and the bearing cover oil passage transmits the lubricating oil received by the bearing cover oil groove to the oil baffle plate; the differential housing is provided with a differential housing oil passage; part of the lubricating oil received by the oil baffle plate is transmitted to the differential bearing, and the other part is transmitted to the differential housing oil passage, and then to the differential gear.

[0006] Furthermore, the bearing cover is fixedly connected to the gearbox housing by bolts.

[0007] Furthermore, the inner ring of the differential bearing is interference-fitted with the differential housing, and the outer ring of the differential bearing is interference-fitted with the gearbox housing and bearing cover assembly.

[0008] Furthermore, the oil baffle is press-fitted onto the differential housing with an interference fit.

[0009] The beneficial effects of this utility model are as follows: 1. By introducing lubricating oil into the differential bearings and gears through oil channels, lubrication is more reliable than splash lubrication; 2. It can reduce the amount of oil added, reduce oil churning loss, reduce temperature rise, and improve transmission efficiency; 3. Differential lubrication is not affected by factors such as vehicle speed, climbing, and amount of oil added, and is suitable for all working conditions of the vehicle, with extremely high reliability. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the gearbox housing and bearing cover assembly of this utility model;

[0012] Figure 3 This is a schematic diagram of the bearing cover structure of this utility model;

[0013] Figure 4 This is a schematic diagram of the installation of the differential-related connecting parts of this utility model.

[0014] In the diagram: 1. Gearbox housing, 11. Gearbox housing oil hole, 2. Bearing cover, 21. Bearing cover oil groove, 22. Bearing cover oil passage, 3. Differential housing, 31. Differential housing oil passage, 4. Differential bearing, 5. Oil baffle, 6. Differential gear. Detailed Implementation

[0015] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings.

[0016] like Figure 1 , 2 As shown in Figures 3 and 4, a differential structure adapted to an actively lubricated electric drive axle includes a gearbox housing 1, a bearing cover 2, a differential housing 3, a differential bearing 4, an oil baffle 5, and a differential gear 6.

[0017] The bearing cover 2 is connected to the gearbox housing 1 by bolts. The inner ring of the differential bearing 4 is interference-fitted to the differential housing 3, and the outer ring of the differential bearing 4 is interference-fitted to the gearbox housing 1 and the bearing cover 2 assembly. The differential housing 3 rotates relative to the gearbox housing 1 and the bearing cover 2 through the differential bearing 4. The oil baffle 5 is interference-fitted and press-fitted onto the differential housing 3 to receive the lubricating oil transmitted from the bearing cover oil passage 22. The differential gear 6 is installed in the inner cavity of the differential housing 3, and the oil baffle 5 and the differential gear 6 rotate together with the differential housing 3.

[0018] A gearbox housing oil hole 11 is provided on the gearbox housing 1, and a bearing cover oil groove 21 is provided on the bearing cover 2. When the active lubrication pump of the electric drive axle is working, the lubricating oil provided by the active lubrication pump flows into the bearing cover oil groove 21 through the gearbox oil hole 11. A bearing cover oil passage 22 is provided on the bearing cover 2, and the bearing cover oil passage 22 and the bearing cover oil groove 21 are connected. The lubricating oil received by the bearing cover oil groove 21 flows to the oil baffle plate 5 through the bearing cover oil passage 22. A differential housing oil passage 31 is provided on the differential housing 3. One side of the oil baffle plate 5 is connected to the differential housing oil passage 31. The lubricating oil flows into the differential gear 6 through the differential housing oil passage 31. The other side of the oil baffle plate 5 has a gap between the gearbox housing 1 and the bearing cover 2 assembly. The lubricating oil flows into the differential bearing 4 through the gap.

[0019] This utility model discloses a differential structure adapted to an actively lubricated electric drive axle. As long as the oil pump is working, the lubricating oil will continuously lubricate the differential bearings and gears through a dredging method; it is not affected by the oil level or vehicle speed, thus greatly improving the reliability of differential lubrication.

[0020] It should be understood that any technical features not described in detail in this specification belong to the prior art. Although the embodiments of this utility model patent have been described, this utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make more forms under the guidance of this utility model without departing from the spirit and scope of protection of this utility model and the claims, and these all fall within the protection scope of this utility model.

Claims

1. A differential structure adapted to an actively lubricated electric drive axle, characterized in that, It is composed of a gearbox housing (1), a bearing cover (2), a differential housing (3), a differential bearing (4), an oil baffle (5), and a differential gear (6); the bearing cover (2) is fixedly connected to the gearbox housing (1); the inner ring of the differential bearing (4) is connected to the differential housing (3), and the outer ring of the differential bearing (4) is connected to the gearbox housing (1) and the bearing cover (2) as a whole; the differential housing (3) rotates relative to the gearbox housing (1) and the bearing cover (2) through the differential bearing (4); the oil baffle (5) is pressed onto the differential housing (3), and the differential gear (6) is provided in the inner cavity of the differential housing (3); the oil baffle (5) and the differential gear (6) rotate together with the differential housing (3); The gearbox housing (1) is provided with a gearbox housing oil hole (11) which can transmit lubricating oil supplied by the active lubrication oil pump; the bearing cover (2) is provided with a bearing cover oil groove (21) and a bearing cover oil passage (22). The bearing cover oil groove (21) receives the lubricating oil transmitted from the gearbox housing oil hole (11), and the bearing cover oil passage (22) transmits the lubricating oil received by the bearing cover oil groove (21) to the oil baffle (5); the differential housing (3) is provided with a differential housing oil passage (31); part of the lubricating oil received by the oil baffle (5) is transmitted to the differential bearing (4), and the other part is transmitted to the differential housing oil passage (31), and then to the differential gear (6).

2. The differential structure adapted to an actively lubricated electric drive axle according to claim 1, characterized in that, The bearing cover (2) is fixedly connected to the gearbox housing (1) by bolts.

3. The differential structure adapted to an actively lubricated electric drive axle according to claim 1, characterized in that, The inner ring of the differential bearing (4) is interference-fitted with the differential housing (3), and the outer ring of the differential bearing (4) is interference-fitted with the gearbox housing (1) and the bearing cover (2).

4. The differential structure adapted to an actively lubricated electric drive axle according to claim 1, characterized in that, The oil baffle (5) is press-fitted onto the differential housing (3) with an interference fit.

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