High-speed gearbox sealing device and high-speed gearbox with same

Abstract

The invention discloses a high-speed gearbox sealing device and a high-speed gearbox with the high-speed gearbox sealing device. The high-speed gearbox sealing device comprises a gearbox body and a shaft, wherein the gearbox body and the shaft are arranged on the high-speed gearbox, and are connected with each other, a bearing block is fixed to the gearbox body, a sealing end cover is installed on the bearing block, the shaft is sleeved with a sealing ring, at least one labyrinth seal cavity, a labyrinth throttling cavity, an oil throwing pressure reduction cavity, a gap seal cavity and the like can be formed in the high-speed gearbox sealing device, at least one oil return hole is further formed in the high-speed gearbox sealing device, and the oil throwing pressure reduction cavity is communicated with the gearbox body through the oil return hole. According to the high-speed gearbox sealing device, contact type sealing and non-contact type sealing are combined, the axial size is small, sealing is safe and reliable, and the design requirement for gearboxes with the higher speed grade is well met.

Description

technical field [0001] The invention belongs to the technical field of rail vehicle drive trains, and in particular relates to a high-speed gearbox sealing device and a high-speed gearbox applying the device. Background technique [0002] As a key component of the EMU, the gearbox plays an important role in transmitting torque and driving the vehicle. Therefore, the operating state of the gearbox will affect the safety and reliability of the entire EMU. [0003] At present, the gear boxes of EMUs are all lubricated with oil. Leakage of lubricating oil will affect the service life of gears, bearings, etc., and may also pollute the environment. When external oil, water and other debris enter the gearbox, it will affect the performance of the lubricating oil, and will also affect the operation of the gears and bearings. Therefore, it is necessary to design a safe and reliable sealing device. The sealing device must ensure two-way sealing to effectively prevent the leakage of l...

AI Technical Summary

Problems solved by technology

[0005] The existing public technology, such as patent 03131680.8, discloses a sealing device for a drive gearbox using a non-contact labyrinth sealing mechanism. The technical solution mainly has the following disadvantages: first, the non-contact labyrinth sealing mechanism consists The first dynamic oil seal ring, the second dynamic oil seal ring, the first static oil seal ring, the second static oil seal ring and the third static oil seal ring, and the three static oil seal rings are all made of aluminum alloy. Welded into one, it is difficult to guarantee the assembly accuracy requirements

Secondly, the sealing device needs to be equipped with a first dynamic oil seal ring, a second dynamic oil seal ring, and an oil deflector ring, all of which are sleeved on the shaft, resulting in a large axial seal size of the sealing device

Another example is patent 102062198A, which discloses a drive gearbox device including a non-contact mechanical labyrinth seal structure. The technical solution mainly has the following disadvantages: first, the labyrinth seal mechanism consists of a hollow shaft sleeve, a first static seal ring, the second static seal ring, the dynamic seal ring, and the transmission gear, and it is necessary to process multiple ring grooves on the transmission gear hub, which is easy to affect the strength of the transmission gear. Industrialization and manufacturing costs bring pressure

Secondly, the box body is provided with multiple grooves, oil return holes, buffer chambers, partitions, cover plates, etc., which objectively increases the complexity of the box body, reduces the processing technology of the box body, and is difficult to meet Gearbox limit and lightweight requirements

[0006] To sum up, the existing sealing device and its gearbox are difficult to meet the application requirements of higher speed grades, and it is necessary to design a stable transmission, safe and reliable, good sealing and lubrication, and meet more stringent axial dimensions and larger center-to-center distance requirements. Gearbox and its sealing device

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