High-torque differential shaft mechanism supported by ball bearing

Abstract

The utility model relates to a high-torque differential shaft mechanism supported by ball bearings, which is characterized by consisting of a differential shaft, a left-end bearing, a large gear and a right-end bearing. The left end bearing and the right end bearing are both deep groove ball bearings. And the differential shaft is in interference fit with the inner ring of the bearing with m-level or n-level tolerance. The end face of the inner ring of the bearing is connected with the differential shaft through a cylindrical pin. Through the measures, the differential shaft is optimized to be supported by the ball bearing, and the power loss of a transmission system is reduced. Meanwhile, under the large torque, the cylindrical pin connection enables the inner ring of the bearing not to wriggle and run, so that the magnitude of interference is reduced, and the differential shaft cannot bear large interference stress causing damage to the differential shaft.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicles, and mainly relates to a high-torque differential shaft mechanism supported by a ball bearing. Background Art

[0002] In recent years, new energy vehicles have made rapid progress. Among them, hybrid electric vehicles are popular with the public for their long driving range. The input of the hybrid electric vehicle transmission system consists of a drive motor and an engine in parallel, which can work separately or in combination. When a large torque output is required, the drive motor and engine work together. Because the input torque is greater than that of a single engine oil vehicle or a single pure electric drive vehicle, the torque of the output differential shaft is greatly increased, and the bearings on the differential shaft are subjected to a large load. If the bearing installation interference is insufficient, creep and sluggishness will occur. At the same time, because the new energy vehicle transmission system requires lower power loss, and ball bearings have lower friction than tapered bearings, the use of ball bearings to support the drive shaft has become a new development direction. However, ball bearings of the same size have a small load capacity. Therefore, if ball bearings are used on the output differential shaft to support higher torque, they need to be larger in size and have a larger interference fit, which conventional interference fits cannot meet the requirements. The larger interference fit causes the differential shaft to be subjected to extremely high hoop stress, and may even damage the differential shaft. This leads to the contradiction that a small interference fit will cause the bearing to creep and sluggishness, while a large interference fit will make the shaft unable to withstand the stress. Summary of the Invention

[0003] The purpose of the utility model is to provide a high-torque differential shaft supported by a ball bearing, so as to solve the problems in the background technology.

[0004] The purpose of this utility model can be achieved by adopting the following technical solutions:

[0005] A high-torque differential shaft mechanism supported by ball bearings, the high-torque differential shaft mechanism having a differential shaft; a large gear is sleeved on the outer side of the differential shaft; deep groove ball bearings for ball supporting the differential shaft are respectively installed at both ends of the differential shaft, and the deep groove ball bearings have lower friction, so that the transmission system can reduce power loss; cylindrical pins are respectively provided at both ends of the differential shaft for limiting the circumferential creep of the inner ring of the bearing; the two ends of the differential shaft are interference fit with the inner ring of the corresponding deep groove ball bearing through the cylindrical pins.

[0006] The end face of the differential shaft is provided with a pin hole corresponding to the cylindrical pin, and the inner end face of the inner ring of the deep groove ball bearing is also provided with a pin hole corresponding to the cylindrical pin. The two pin holes are connected by the cylindrical pin during installation.

[0007] The interference fit differential shaft is set with an m or n level tolerance zone.

[0008] The present invention proposes a high-torque differential shaft mechanism supported by ball bearings, in which the differential shaft is supported by ball bearings, reducing the power loss of the transmission system; at the same time, a fit lower than the required interference fit is set and cylindrical pins are used for connection, so that the inner ring of the bearing will not creep and the differential shaft will not be subjected to large interference stress that may cause its damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic structural diagram of the present utility model.

[0010] Figure 2 Bearing installation diagram of the present utility model.

[0011] In the figure: 1. Deep groove ball bearing, 1.1. Inner ring, 1.2. Steel ball, 1.3. Cage, 1.4. Outer ring, 2. Differential shaft, 3. Large gear, 4. Right end bearing, 5. Right end bearing. DETAILED DESCRIPTION

[0012] The present invention is described with reference to the accompanying drawings and specific embodiments.

[0013] like Figure 1 As shown, a high-torque differential shaft mechanism supported by ball bearings has a differential shaft 2; a large gear 3 is sleeved on the outer side of the differential shaft 2; deep groove ball bearings 1 for ball supporting the differential shaft are respectively installed at both ends of the differential shaft 2, and the deep groove ball bearings 1 have lower friction, so that the transmission system can reduce power loss; cylindrical pins are respectively provided at both ends of the differential shaft 2 for limiting the circumferential creep of the inner ring of the bearing; the two ends of the differential shaft 2 are respectively interference fit with the inner ring of the corresponding deep groove ball bearing 1 through the cylindrical pins.

[0014] like Figure 2 As shown, the deep groove ball bearing 1 comprises an inner ring 1.1, steel balls 1.2, a cage 1.3, and an outer ring 1.4. The inner ring 1.1 is provided with a pin hole 1.1.1 on its inner end face; correspondingly, the differential shaft 2 is provided with a pin hole 2.1 on its end face. The bearing is secured during installation using a cylindrical pin, which restricts circumferential rotation of the inner ring 1.1, allowing it to rotate only with the differential shaft 2. Consequently, the interference fit between the inner ring and the differential shaft no longer requires level r; the conventional level m or n can suffice, significantly reducing interference stress on the mating surfaces.

[0015] The number of the cylindrical pin hole is at least one.

[0016] The parts not described in detail are prior art.

Claims

1. A high-torque differential shaft mechanism supported by ball bearings, the high-torque differential shaft mechanism comprising a differential shaft; a large gear is sleeved on the outer side of the differential shaft; and the characteristics are: Deep groove ball bearings are installed at both ends of the differential shaft to provide ball support for the differential shaft; cylindrical pins are provided at both ends of the differential shaft to limit the circumferential creep of the inner ring of the bearing; and the two ends of the differential shaft are interference fit with the inner ring of the corresponding deep groove ball bearing through the cylindrical pins.

2. A high torque differential shaft mechanism supported by a ball bearing according to claim 1, characterized in that: The end face of the differential shaft is provided with a pin hole corresponding to the cylindrical pin, and the inner end face of the inner ring of the deep groove ball bearing is also provided with a pin hole corresponding to the cylindrical pin. The two pin holes are connected by the cylindrical pin during installation.

3. The high-torque differential shaft mechanism supported by a ball bearing according to claim 1, characterized in that: The interference fit differential shaft is set with an m or n level tolerance zone.

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