A new energy automobile electric drive tapered roller bearing supported reduction intermediate shaft

Abstract

The utility model belongs to the technical field of rolling bearing, and mainly relates to a new energy automobile electric drive tapered roller bearing supporting reduction intermediate shaft, including a intermediate shaft, the rear section of intermediate shaft is provided with the left end bearing of excess fit with it, is provided with the big gear of excess fit with it on the outer diameter surface of middle section, is provided with the pinion of integration together with it on the outer diameter surface of the front section of intermediate shaft, the front end surface of pinion is provided with the right end bearing of excess fit with the outer diameter surface of intermediate shaft, the left end bearing and right end bearing are same bearing, and the left end bearing and right end bearing all are composed of inner race, roller, retainer and outer race. The utility model discloses the use of the reduction intermediate shaft of tapered roller bearing support that is arranged, and the big end surface of bearing can form new oil circuit, so that the big end surface of bearing can be cooled by lubricating oil, reduces the risk that the big baffle of current bearing is blackened and discolored even baffle is broken at high temperature, prolongs the service life of bearing.

Description

Technical Field

[0001] This utility model belongs to the field of rolling bearing technology, and mainly relates to a deceleration intermediate shaft supported by a tapered roller bearing for electric drive in new energy vehicles. Background Technology

[0002] The rapid development of new energy electric vehicles in recent years has spurred unprecedented advancements in motor drive and transmission systems. These systems convert electrical energy into mechanical energy, driving the car's wheels to rotate. Due to the high speed of the motor, a reduction gear mechanism is typically required to transmit the energy and achieve a suitable running speed. This reduction gear mechanism generally includes a motor input shaft, a reduction intermediate shaft, and an output shaft. The intermediate shaft typically has two helical gears with significant torque and axial force, making tapered roller bearings, capable of withstanding large axial forces, a suitable choice. However, given the high shaft speed and the lower limiting speed of tapered roller bearings compared to ball bearings, along with their higher coefficient of friction, low-friction, high-speed, and low-temperature-rise tapered roller bearings are in high demand. However, the rollers and flanges in tapered roller bearings experience sliding friction. At high speeds, this rapid friction at the contact surface can easily cause overheating, and the flanges may discolor or even break due to high temperatures. This not only affects the lifespan of the tapered roller bearing but also poses a safety hazard to the vehicle. Utility Model Content

[0003] The purpose of this invention is to provide a deceleration intermediate shaft supported by a tapered roller bearing for electric drive in new energy vehicles, which can solve the problem of rapid temperature rise caused by rapid friction between the rollers and the large flange of the tapered roller bearing in the prior art.

[0004] To achieve the purpose of this utility model, the technical solution adopted is as follows: A reduction intermediate shaft supported by a tapered roller bearing for electric drive in a new energy vehicle includes an intermediate shaft; the rear section of the intermediate shaft is provided with a left end bearing that is interference-fitted with it, the outer diameter surface of the middle section is provided with a large gear that is interference-fitted with it, and the outer diameter surface of the front section of the intermediate shaft is provided with a small gear integrated therewith; the front end face of the small gear is provided with a right end bearing that is interference-fitted with the outer diameter surface of the intermediate shaft.

[0005] The left and right bearings are the same type of bearing, and both the left and right bearings consist of an inner ring, rollers, a cage, and an outer ring; the inner ring has several oil grooves evenly distributed along the circumference on the large end face; the oil grooves are circular arcs R and have a depth L.

[0006] The right-end bearing has its large end face close to the small gear to form a right-end shoulder; a right-end oil groove of a certain depth is provided at the right-end shoulder, and the right-end oil groove and the oil groove on the large end face of the inner ring of the bearing form an oil passage.

[0007] After the left-end bearing is installed on the left end of the intermediate shaft, its large end face is close to the end face of the large gear, and it does not contact the shoulder of the intermediate shaft, leaving a certain gap.

[0008] The distance L1 from the end face of the large gear to the starting end of the intermediate shaft is greater than the distance L2 from the shoulder of the shaft to the starting end of the intermediate shaft.

[0009] The oil groove on the large end face of the inner ring of the bearing and the installation gap at the shoulder constitute an oil passage.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by using the tapered roller bearing to support the deceleration intermediate shaft, a new oil passage can be formed on the large end face of the bearing, so that the lubricating oil can cool the large end face of the bearing, reducing the risk of the large flange of the bearing burning black and discoloring at high temperature or even breaking, which not only extends the service life of the bearing but also reduces safety hazards. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention.

[0012] Figure 2 The bearing structure diagram of this utility model.

[0013] Figure 3 The structure diagram of the oil tank of this utility model.

[0014] Figure 4 Installation diagram of the left end bearing of this utility model.

[0015] Figure 5 Installation diagram of the right-end bearing of this utility model.

[0016] In the diagram: 1. Intermediate shaft, 2. Left end bearing, 3. Large gear, 4. Small gear, 5. Right end bearing, 6. Inner ring, 7. Roller, 8. Cage, 9. Outer ring, 10. Oil groove, 11. Right end shoulder, 12. Right end oil groove, 13. Shoulder. Detailed Implementation

[0017] The present invention will be described in conjunction with the accompanying drawings.

[0018] like Figures 1-5The diagram illustrates a reduction intermediate shaft for an electric drive system in a new energy vehicle, supported by a tapered roller bearing. The intermediate shaft includes an intermediate shaft 1. A left-end bearing 2 with an interference fit is located at the rear end of the intermediate shaft 1. A large gear 3 with an interference fit is located on the outer diameter surface of the intermediate shaft 1. A small gear 4 integrated with the intermediate shaft 1 is located on the outer diameter surface of the front end of the intermediate shaft 1. A right-end bearing 5 with an interference fit is located on the front end face of the small gear 4. The left-end bearing 2 and the right-end bearing 5 are identical bearings, each consisting of an inner ring 6, rollers 7, a cage 8, and an outer ring 9. The inner ring 6 has several oil grooves 10 evenly distributed along its circumference on its large end face. Each oil groove 10 is an arc R with a depth L. After the left-end bearing 2 is installed on the left end of the intermediate shaft 2, its large end face is close to the end face of the large gear 3, but does not contact the shoulder 13 of the intermediate shaft 1, leaving a certain gap. The right-end bearing 5 has its large end face closely abutting the small gear 4 to form a right-end shoulder 11. A right-end oil groove 12 of a certain depth is provided at the right-end shoulder 11, and the right-end oil groove 12 and the oil groove 10 on the large end face of the bearing inner ring 6 form an oil passage. This oil passage allows the lubricating oil to cool the large end face of the bearing during operation. The distance L1 from the end face of the large gear 3 to the beginning of the intermediate shaft 1 is greater than the distance L2 from the shoulder to the beginning of the intermediate shaft. The oil groove 10 on the large end face of the bearing inner ring 6 and the installation gap at the shoulder form an oil passage. This oil passage allows the lubricating oil to cool the large end face of the bearing during operation.

[0019] In use, the end faces of the left bearing 2 and the large gear 3 are in contact, forming a gap with the shaft shoulder. The oil groove 10 on the bearing end face and the gap with the shaft shoulder form an oil passage. The oil groove 10 on the right bearing 5 and the right oil groove 12 on the right shaft shoulder 11 form an oil passage, which allows the lubricating oil to cool the large end face of the bearing, reducing the risk of the large bearing flange burning black and discoloring at high temperatures or even breaking. This ensures that the bolts are pressed at a perpendicular angle to the flange face, avoiding bolt misalignment, improving production assembly efficiency, and saving production costs.

[0020] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A reduction intermediate shaft supported by a tapered roller bearing for electric drive in new energy vehicles, characterized in that: The system includes an intermediate shaft (1); a left-end bearing (2) with an interference fit is provided at the rear section of the intermediate shaft (1), a large gear (3) with an interference fit is provided on the outer diameter surface of the middle section, and a small gear (4) integrated with it is provided on the outer diameter surface of the front end of the intermediate shaft (1); a right-end bearing (5) with an interference fit is provided on the front end surface of the small gear (4); the left-end bearing (2) and the right-end bearing (5) are the same type of bearing, and both the left-end bearing (2) and the right-end bearing (5) consist of an inner ring (6), rollers (7), and a cage (8). The inner ring (6) is composed of an outer ring (9); the inner ring (6) has several oil grooves (10) evenly distributed around the circumference on its large end face; the right end bearing (5) has its large end face close to the small gear (4) to form a right end shoulder (11); a right end oil groove (12) of a certain depth is provided at the right end shoulder (11), and the right end oil groove (12) and the oil groove (10) on the large end face of the bearing inner ring (6) form an oil passage; the left end bearing (2) is installed on the left end of the intermediate shaft (1), and its large end face is close to the end face of the large gear (3), and it does not contact the shoulder (13) of the intermediate shaft (1), with a certain gap.

2. The reduction intermediate shaft supported by a tapered roller bearing for electric drive in new energy vehicles according to claim 1, characterized in that: The oil groove (10) is an arc R with a depth L.

3. The reduction intermediate shaft supported by a tapered roller bearing for electric drive in new energy vehicles according to claim 1, characterized in that: The distance L1 from the end face of the large gear (3) to the beginning of the intermediate shaft (1) is greater than the distance L2 from the shoulder to the beginning of the intermediate shaft (1).

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