阅读说明：本技术 直流牵引电机用抱轴瓦 (Axle suspension bush for direct current traction motor ) 是由 李宝锋 连鑫 许晓亮 吕志成 于 2020-07-01 设计创作，主要内容包括：本发明涉及机车直流牵引电机悬挂时所用的抱轴瓦,具体为直流牵引电机用抱轴瓦。解决现有抱轴瓦漏油、易失圆、耐磨性较差的问题。直流牵引电机用抱轴瓦包括瓦体,瓦体两端分别开有两道密封槽,密封槽内有密封毡圈,密封槽的结构保证抱轴瓦装配后密封毡圈的径向挤压变形量为0.8－1.2mm。瓦体外径与直流牵引电机机座内孔公差配合选用小过渡配合,保证其过盈量在-0.05mm～+0.035mm之间；瓦体内径保证其与轮轴单边间隙在0.3mm～0.5mm之间。瓦体滑动面上设有锡基合金层。本发明采用双道密封槽,避免润滑油的泄漏。选用合适的外径公差,避免装配后抱轴瓦内孔变形失圆。选用合适的内径公差,避免抱轴瓦与轮轴直接摩擦。(The invention relates to a bearing bush used when a locomotive direct current traction motor is suspended, in particular to a bearing bush for a direct current traction motor. The problem of current axle suspension bush oil leak, volatile circle, wearability relatively poor is solved. The axle suspension bush for the direct current traction motor comprises a bush body, two ends of the bush body are respectively provided with two sealing grooves, sealing felt rings are arranged in the sealing grooves, and the radial extrusion deformation of the sealing felt rings is 0.8-1.2 mm after the axle suspension bush is assembled due to the structure of the sealing grooves. The tolerance fit of the outer diameter of the tile body and the inner hole of the base of the direct current traction motor adopts small transition fit, and the interference magnitude is ensured to be between-0.05 mm and +0.035 mm; the inner diameter of the tile body ensures that the gap between the tile body and the single side of the wheel axle is between 0.3mm and 0.5 mm. The sliding surface of the tile body is provided with a tin-based alloy layer. The double-channel sealing groove is adopted, so that the leakage of lubricating oil is avoided. And the proper outer diameter tolerance is selected, so that the deformation and the out-of-round of the inner hole of the axle suspension bush after assembly are avoided. And a proper inner diameter tolerance is selected, so that the direct friction between the axle suspension bush and the wheel axle is avoided.)

1. The axle suspension bush for the direct-current traction motor comprises a bush body (1) and is characterized in that two ends of the bush body (1) are respectively provided with two sealing grooves, sealing felt rings (3) are arranged in the sealing grooves, and the radial extrusion deformation of the sealing felt rings (3) is 0.8-1.2 mm after the axle suspension bush is assembled due to the structure of the sealing grooves.

2. The axle suspension bush for the direct current traction motor according to claim 1, characterized in that the tolerance fit of the outer diameter of the bush body (1) and the inner hole of the base of the direct current traction motor is selected to be small transition fit, and the interference range is ensured to be between-0.05 mm and +0.035 mm; the inner diameter of the tile body (1) ensures that the single-side gap between the tile body and the wheel axle (2) is between 0.3mm and 0.5 mm.

3. A bearing shell for a dc traction motor according to claim 1 or 2, wherein a tin-based alloy layer (4) is provided on the sliding surface of the shell body (1).

4. The axle suspension bush for the direct current traction motor according to claim 3, wherein the blank of the bush body (1) and the tin-based alloy layer (4) are manufactured by a centrifugal casting process.

5. The axle suspension bush for the direct current traction motor according to claim 4, characterized in that the bush body (1) is provided with an oil return hole (5) communicated with the bottom of the sealing groove, and the oil return hole (5) is communicated with the bottom of the sealing groove inside.

Technical Field

The invention relates to a bearing bush used when a locomotive direct current traction motor is suspended, in particular to a bearing bush for a direct current traction motor.

Background

The mounting modes of the direct current traction motor and the locomotive wheel shaft are divided into a rolling axle suspension structure and a sliding axle suspension structure. The existing sliding axle suspension bush only has one sealing groove at each end, the sealing is poor, the problems of oil leakage and tile grinding can often occur in the sliding axle suspension structure in the using process, even the machine is broken, and the normal operation of the locomotive is influenced. In addition, the sliding surface of the axle suspension bush has relatively poor wear resistance. Moreover, the internal and external diameters of the axle suspension bush are not proper, so that the axle suspension bush is not tightly clamped or is over-tightly clamped after being assembled, the internal diameter of the axle suspension bush is deformed and out of round, and direct friction with an axle is caused.

Disclosure of Invention

The invention solves the defects and problems of the existing axle suspension bush, and provides the axle suspension bush for the direct current traction motor so as to overcome the defects and problems of the existing axle suspension bush.

The invention is realized by adopting the following technical scheme: the axle suspension bush for the direct current traction motor comprises a bush body, two ends of the bush body are respectively provided with two sealing grooves, sealing felt rings are arranged in the sealing grooves, and the radial extrusion deformation of the sealing felt rings is 0.8-1.2 mm after the axle suspension bush is assembled due to the structure of the sealing grooves. The friction between the locomotive axle and the sealing ring can cause the temperature of the locomotive axle to rise, and the overhigh temperature can cause the phenomenon of tile grinding, so that the traditional design concept considers that each end of the axle suspension bush can only be provided with one sealing groove. The invention overcomes the traditional design concept, two sealing grooves are respectively arranged at two ends of the tile body, but the radial extrusion deformation of the sealing felt ring after the axle suspension bush is assembled is about 1mm through the reasonable design of the sealing groove structure, so that the two sealing felt rings at each end can play a role in enhancing the sealing and preventing lubricating oil from leaking, and meanwhile, the tile rolling phenomenon caused by the temperature rise after friction due to the increase of the sealing rings and too large interference can be avoided through the accurate selection of the radial extrusion deformation of the sealing felt rings.

Furthermore, the tolerance fit between the outer diameter of the tile body and the inner hole of the base of the direct current traction motor adopts small transition fit, and the interference magnitude is ensured to be between-0.05 mm and +0.035 mm; the inner diameter of the tile body ensures that the gap between the tile body and the single side of the wheel axle is between 0.3mm and 0.5 mm. Therefore, the deformation of the axle suspension bush after being assembled can be reduced, and the axle suspension bush is not loosened from the base.

Furthermore, a tin-based alloy layer is arranged on the sliding surface of the tile body, so that the wear resistance of the friction surface is improved.

The invention adopts a double-channel sealing groove structure, thereby avoiding the leakage of lubricating oil, avoiding the excessive consumption of the lubricating oil and polluting the environment. And the proper external diameter tolerance is selected, the interference magnitude of the axle suspension bush and the axle suspension hole of the base is reduced, and the deformation and the out-of-round of the inner hole of the axle suspension bush after assembly are avoided. The proper inner diameter tolerance is selected, the bearing bush deformation is caused by the interference or clearance of the outer diameter during the compensation installation, the lubrication clearance between the inner hole of the bearing bush and the wheel shaft is uniform, and the phenomenon that the bearing bush is rolled due to severe heating caused by the direct friction between the bearing bush and the wheel shaft is avoided.

Drawings

Fig. 1 is a schematic structural view of a bearing shell for a direct current traction motor according to the present invention;

fig. 2 is an assembly schematic diagram of a bearing shell for the direct current traction motor.

In the figure: 1-tile body, 2-wheel axle, 3-sealing felt ring, 4-tin base alloy layer, 5-oil return hole, 6-oil tank, 7-lubricating oil, 8-oil absorption felt and 9-engine base.

Detailed Description

The axle suspension bush for the direct current traction motor comprises a bush body 1, two ends of the bush body 1 are respectively provided with two sealing grooves, sealing felt rings 3 are arranged in the sealing grooves, and the radial extrusion deformation of the sealing felt rings 3 after the axle suspension bush is assembled is guaranteed to be 0.8-1.2 mm (for example, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm and 1.2mm can be selected). The outer diameter of the tile body 1 is matched with the inner hole of the base of the direct current traction motor in a tolerance mode, and small transition fit is selected, so that the interference magnitude is guaranteed to be between-0.05 mm and +0.035mm (for example, the interference magnitude can be selected to be-0.05 mm, 0mm and +0.035 mm); the inner diameter of the tile body 1 ensures that the single-side gap between the tile body and the wheel axle 2 is between 0.3mm and 0.5mm (for example, 0.3mm, 0.4 mm and 0.5mm can be selected). The sliding surface of the tile body 1 is provided with a tin-based alloy layer 4, so that the wear resistance of the friction surface is improved. In specific implementation, the blank of the tile body 1 and the tin-based alloy layer 4 are manufactured by adopting a centrifugal casting process, so that casting defects are reduced, and the mechanical property and the physical property of a casting are improved; the entire tile is then cut in half. And (3) buckling the upper tile and the lower tile into a whole circle by using a tool during turning of the inner hole, the outer hole and the sealing groove, and then integrally processing. Like the existing axle suspension bush, the bush body 1 is provided with an oil return hole 5 communicated with the bottom of the sealing groove, and the oil return hole 5 is communicated with the bottom of the sealing groove close to the inside, so that the lubricating oil accumulated in the sealing groove is prevented from overflowing to cause waste and pollution; due to the structural design of the oil return hole, redundant lubricating oil between the axle suspension bush and the wheel axle can be conveyed into the oil return box for cyclic utilization. An oil inlet hole is formed in the tile body 1, an oil absorption felt 8 is arranged in the oil inlet hole, and the oil absorption felt 8 sends lubricating oil 7 in the oil tank 6 to a position between the tile body 1 and the wheel shaft 2.