Double-oil-seal sealing system for integrated power assembly of new energy heavy truck

Abstract

The utility model discloses a double-oil-seal sealing system for an integrated power assembly of a new energy heavy truck. The double-oil-seal sealing system comprises an end cover shared by a motor and a transmission, a rotating shaft, a bearing, a grease lubricating oil seal and an oil lubricating oil seal, the oil lubricating oil seal can block oil liquid, and the grease lubricating oil seal can block oil gas, so that lubricating oil and the oil gas in the transmission cannot enter a motor cavity. The problem that a motor insulation system is damaged and loses efficacy due to the fact that lubricating oil and oil gas of the transmission of the integrated power assembly of the new energy heavy truck leak into a motor cavity can be solved only by adding one grease lubricating oil seal, the ventilation valve and the oil plug, the structure is simple, cost is low, reliability is high, and practical engineering popularization is easy.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy heavy truck integrated power assembly's oil seal technical field, and relates to a double oil seal system for new energy heavy truck integrated power assembly. BACKGROUND

[0002] The power system of new energy vehicles develops in the depth integration route from passenger cars, and the motor has developed from the original separate water cooling and bolt connection with the reducer cavity to the integrated system with oil cooling with the reducer.

[0003] The power system of new energy heavy trucks currently mainly adopts the modular bolt connection technology route of water-cooled motors and multi-gear transmission, and the system has heavy overall weight, large size and high cost, but from the market demand, it is also developing in the direction of high integration, small size and low cost.

[0004] The heavy truck transmission has high gear bearing capacity, high viscosity lubricating oil and sulfide additives, and once the lubricating oil of the heavy truck transmission enters the motor cavity, the contained sulfide will corrode the motor insulation system, accelerate the aging of the motor insulation system, and further cause the motor insulation system to fail and the winding to short circuit and burn out.

[0005] Due to the fact that the single oil seal structure cannot completely avoid a small amount of lubricating oil or oil gas from entering the motor cavity, in order to solve the problem, domestic and foreign counterparts either adopt modular design of the motor and the transmission, bolt connection between the motor and the transmission, and lubricating oil isolation by the intermediate cavity, or adopt common oil cooling design of the motor and the transmission. However, the modular design will cause the power system to have heavy weight, large size and high cost, and due to the different requirements of motor cooling oil and heavy truck transmission lubricating oil, each lubricating oil manufacturer has not yet put forward a mature and reliable compatible lubricating oil, resulting in that the heavy truck integrated power system cannot be widely applied. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a double oil seal system for new energy heavy truck integrated power assembly, which effectively solves the problem of lubricating oil of the new energy heavy truck integrated power assembly transmission entering the motor cavity and causing motor insulation failure by adopting a double oil seal structure between the motor and the transmission, and increasing a gas pressure balance breather valve and an oil drain plug between the double oil seals. The scheme has simple structure, low cost, high reliability and is easy to promote in engineering practice.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme to achieve it:

[0008] A kind of double oil seal sealing system for new energy heavy truck integrated power assembly, including the end cap shared by motor and transmission, rotating shaft, bearing, and grease lubricating oil seal and oil lubricating oil seal;

[0009] The end cap is installed between the motor and the transmission;The rotating shaft shared by the motor and the transmission passes through the through hole in the center of the end cap.

[0010] The grease lubricating oil seal, the oil lubricating oil seal and the bearing are sequentially installed in the annular gap between the end cap and the rotating shaft from the motor to the transmission.

[0011] The utility model also includes the following technical features:

[0012] Specifically, the upper through hole is located between the grease lubricating oil seal and the oil lubricating oil seal.

[0013] Specifically, the air vent is installed on the upper through hole, which can balance the air pressure between the two oil seals and also can discharge the oil gas between the two oil seals.

[0014] Specifically, the lower through hole is located between the grease lubricating oil seal and the oil lubricating oil seal.

[0015] Specifically, the oil plug is installed at the lower through hole, and the lubricating oil condensed between the two oil seals can be stored in the lower through hole.

[0016] Specifically, the inner wall of the center through hole of the end cap is provided with a grease lubricating oil seal installation position, an oil lubricating oil seal installation position and a bearing position to respectively install the grease lubricating oil seal, the oil lubricating oil seal and the bearing.

[0017] Specifically, the diameter of the grease lubricating oil seal is smaller than that of the oil lubricating oil seal.

[0018] Compared with the prior art, the utility model has the following technical effects:

[0019] The double oil seal sealing system only needs to add a grease lubricating oil seal, an air vent and an oil plug to solve the problem of leakage of lubricating oil and oil gas of the transmission of the new energy heavy truck integrated power assembly into the motor cavity, causing damage to the motor insulation system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model is a whole layout structure schematic diagram.

[0021] The meanings of the various reference numerals in the drawings are as follows:

[0022] 1. Motor, 2. Gearbox, 3. End cover, 4. Shaft, 5. Bearing, 6. Grease seal, 7. Oil seal, 8. Vent valve, 9. Oil plug. Detailed Implementation

[0023] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0024] Example 1:

[0025] like Figure 1 As shown, this embodiment provides a dual oil seal system for an integrated powertrain of a new energy heavy truck, including an end cover 3, a shaft 4, a bearing 5 shared by the motor 1 and the transmission 2, as well as a grease-lubricated seal 6 and an oil-lubricated seal 7.

[0026] The end cover 3 is installed between the motor 1 and the gearbox 2; the shaft 4 shared by the motor 1 and the gearbox 2 passes through the through hole in the center of the end cover 3.

[0027] In the annular gap between the end cover 3 and the rotating shaft 4, a grease-lubricated seal 6, an oil-lubricated seal 7, and a bearing 5 are installed sequentially from the motor 1 toward the gearbox 2.

[0028] Both oil seals are double-lip oil seals. The oil-lubricated oil seal can block oil, and the grease-lubricated oil seal can block oil vapor, so that the lubricating oil and oil vapor in the transmission cannot enter the motor cavity.

[0029] The end cap 3 has an upper through hole along the radial direction, which is located between the grease-lubricated oil seal 6 and the oil-lubricated oil seal 7.

[0030] A vent valve 8 is installed on the upper through hole. The vent valve 8 can ensure the air pressure balance between the two oil seals and can also discharge the oil and gas between the two oil seals.

[0031] The end cap 3 has a lower through hole along the radial direction, which is located between the grease-lubricated oil seal 6 and the oil-lubricated oil seal 7.

[0032] An oil plug 9 is installed at the lower through hole. The lower through hole can store a small amount of lubricating oil that condenses between the two oil seals. During maintenance, the oil plug 9 can be used to remove the oil and prevent the oil and gas from entering the motor cavity 1.

[0033] The inner wall of the central through hole of the end cap 3 is provided with a grease lubricating seal mounting position, an oil lubricating seal mounting position and a bearing position, so as to install the grease lubricating seal 6, the oil lubricating seal 7 and the bearing 5 respectively.

[0034] The diameter of the grease-lubricated oil seal 6 is smaller than the diameter of the oil-lubricated oil seal 7.

[0035] In the design of the integrated power assembly of the new energy heavy truck, two oil seal installation positions, one bearing position and two through holes are machined on the end cover shared by the motor and the transmission, a small-diameter grease lubrication oil seal is first installed on the end cover near the motor side, then an oil lubrication oil seal is installed, and finally the bearing shared by the motor and the transmission is installed. The upper through hole is provided with a breather valve, which can balance the air pressure between the two oil seals and also can discharge the oil gas between the two oil seals; the lower through hole is provided with an oil plug, the inside of the through hole can store a small amount of lubricating oil condensed from the oil gas between the two oil seals, which is discharged during the maintenance of the power assembly to avoid the oil gas entering the motor cavity. The two oil seals installed inside, the oil lubrication oil seal is responsible for blocking the oil, and the grease lubrication oil seal is responsible for blocking the oil gas, which effectively solves the problem that the lubricating oil or oil gas in the transmission enters the motor cavity after the integrated design of the power assembly.

[0036] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the utility model within the technical concept of the utility model, and these simple modifications all belong to the protection scope of the utility model.

[0037] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the utility model will not further describe various possible combination manners.

[0038] In addition, various different embodiments of the utility model can also be combined arbitrarily, as long as they do not deviate from the idea of the utility model, and they should also be considered as disclosed by the utility model.

Claims

1. A double oil seal system for an integrated powertrain of a new energy heavy truck, characterized in that, The end cover (3) shared by the motor (1) and the transmission (2), the rotating shaft (4), the bearing (5), the grease lubricating oil seal (6) and the oil lubricating oil seal (7) are included. The end cover (3) is installed between the motor (1) and the transmission (2); the rotating shaft (4) shared by the motor (1) and the transmission (2) passes through the through hole in the center of the end cover (3). The grease lubricating oil seal (6), the oil lubricating oil seal (7) and the bearing (5) are installed in the annular gap between the end cover (3) and the rotating shaft (4) in sequence from the motor (1) to the transmission (2).

2. The double oil seal system for the integrated powertrain of new energy heavy-duty truck according to claim 1, characterized in that, The upper through hole is radially arranged on the end cover (3) and is located between the grease lubricating oil seal (6) and the oil lubricating oil seal (7).

3. The double oil seal system for the integrated powertrain of new energy heavy-duty truck according to claim 2, characterized in that, The breather valve (8) is installed on the upper through hole, which can balance the air pressure between the two oil seals and can also discharge the oil gas between the two oil seals.

4. The dual oil seal system for the integrated powertrain of new energy heavy-duty truck of claim 1, wherein, The lower through hole is radially arranged on the end cover (3) and is located between the grease lubricating oil seal (6) and the oil lubricating oil seal (7).

5. The double oil seal system for the integrated powertrain of new energy heavy-duty truck according to claim 4, characterized in that, The oil plug (9) is installed at the lower through hole, the oil gas condensed between the two oil seals can be stored in the inside of the lower through hole, and the oil plug (9) can be used to discharge the oil gas during maintenance, so that the oil gas cannot enter the cavity of the motor (1).

6. The dual oil seal system for an integrated powertrain of a new energy heavy-duty truck of claim 1, wherein, The inner wall of the through hole in the center of the end cover (3) is provided with the grease lubricating oil seal installation position, the oil lubricating oil seal installation position and the bearing position, so as to respectively install the grease lubricating oil seal (6), the oil lubricating oil seal (7) and the bearing (5).

7. The dual oil seal system for an integrated powertrain of a new energy heavy-duty truck of claim 1, wherein, The diameter of the grease lubricating oil seal (6) is smaller than that of the oil lubricating oil seal (7).

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