CN201043607Y - Sliding bearing sealing structure of electric principal shaft - Google Patents

Abstract

The utility model discloses a sealing structure of the sliding bearing of a electric main shaft. The purpose of the utility model is to provide a sealing structure of the sliding bearing which is characterized by good processing property of assembly and maintenance, reasonable structure, effective sealing of the liquid leaked from the end of the sliding bearing and avoidance of the leaked liquid corrosion of the stator and rotor of an electric motor. The rotor of the electric motor is mount in the middle, the sliding bearing is nested in the liquid-throwing ring and liquid-blocking ring of both ends, which are arranged on the main shaft, an annular groove is arranged on the main shaft to from the liquid-throwing ring, which is positioned between the sliding bearing and the rotor of the electric motor, the liquid-blocking ring is nested on the liquid-throwing ring and fixed on the end surface of the sliding bearing, the inner hole of the liquid-blocking ring is a stepped hole, the small hole section of the stepped hole is nested on the main shaft, a liquid-blocking cavity is formed between the large hole section and the liquid-throwing ring, and a liquid-discharging orifice is arranged on the lower part of the large hole section.

Description

The sliding bearing sealing configuration of electricity main shaft

Technical field

The utility model relates to mechanical manufacturing field, relates in particular to the sliding bearing sealing configuration of motor built-in type electricity main shaft.

Background technique

With high cutting speed, high feed speed, high manufacturing accuracy is that the high speed and precision processing of major character is one of four big advanced manufacturing technologies in the present age, is to make manufacturing technology produce the new and high technology that revolutionary character for the second time leaps continue Numeric Control Technology after.The high speed and precision working machine tool not only has high manufacturing efficiency, and can improve the machining accuracy and the surface quality of part significantly.The main shaft of high-speed precise machine tool is as the Core Feature parts, and the height of its performance directly has influence on the overall development level of high speed and precision working machine tool.The high-speed and precise electric main shaft is a kind of based on bearing technology, the accurate high-tech product made from the height electromechanical integration of mounting technology.Its characteristics are, the function and the machine tool chief axis function of motor combined together from structure, have saved complicated middle transmission link, but have speed-regulating range width, the little quick starting of rotary inertia and parking, be easy to realize advantages such as stepless speed regulation and accurate control.Along with the develop rapidly of modern manufacturing industry to high-speed, highi degree of accuracy, high efficiency direction, more and more higher to the performance requirement of machine tool chief axis unit, electric main shaft just progressively replaces traditional belt driven type mechanical main shaft, becomes the main flow structure of modern machine main shaft.At present, the bearing that is applied to the high-speed and precise electric main shaft mainly contains magnetic suspension bearing, pneumatic bearing, rolling bearing and liquid sliding bearing.Wherein, magnetic suspension bearing rotating speed height, it is little to wear and tear, but since its control system complexity, the cost height, and its practicability as electric main shaft is restricted.Pneumatic bearing has the rotating speed height, and it is little to wear and tear, advantage of high precision, but, can only be used for the small-power main shaft of small cutting force processing because its rigidity is little, and bearing capacity is limited.Rolling bearing is the main support structure of present electric main shaft, has the speed height, simple in structure, can produce in batches, can integral replacing during maintenance etc. advantage, but there are two intrinsic deficiencies: the one, because rolling bearing is a high frequency rotary work under contact condition, there are fretting wear and fatigue wear inevitably, working life is shorter, after work a period of time, must take main shaft apart keeps in repair, and the maintenance of main shaft and assembly technology complexity, level to the maintenance man requires very high, maintenance or change main shaft and need expensive time and cost causes harmful effect to the production operation efficiency of lathe; The 2nd, because rolling bearing is to rely on the rigidity contact of limited rolling element that bearing capacity is provided, the local stress that raceway and ball touch inside and outside bearing is very high, and the local stress that does not touch is less, certainly existing in a circumferential direction and be out of shape uneven phenomenon, therefore adopt rolling bearing not to be suitable for machining accuracy and surface finishment are required very high occasion, as precision grinder, precision boring machine etc. as the electric main shaft that supports.

Liquid sliding bearing is because the effect that bearing capacity is strong, lubricant medium has damping vibration attenuation and " homogenizing " error, therefore adopt liquid sliding bearing as the machine tool chief axis good rigidly, the rotating accuracy height that support, be very suitable for spindle unit as precision machine tool such as precision grinder and precision boring machine.Adopting liquid sliding bearing on the engineering at present often is motor postposition formula structure or motor straight connection type structure as the electric main shaft that supports, be the rear end that electric machine rotor is positioned at front and back bearings, there is following weakness in this structure: the one, and physical dimension is big, the shaft strength situation is poor, be unfavorable for the machine tool structure compactness; The 2nd, weight is big, the interpolation low-response, and wheel profile face machining accuracy is difficult to guarantee; The 3rd, rearmounted motor causes the load unbalance loading easily, and the unbalance loading load causes bearing temperature rise to raise easily, is unfavorable for raising speed and precision.If adopt motor built-in type hydrodynamic and hydrostatic pressure electricity main shaft structure, then have following obvious advantage: the one, weight reduces about 50%, carry out in the total control moving interpolation as the moving member of lathe when main tapping, system response time is very fast, and the workpiece profile machining accuracy is higher; The 2nd, it is about 50% that physical dimension reduces, and helps the layout of the lathe headstock and tailstock, owing to can avoid rearmounted motor and tailstock or workpiece interference in the course of working easily, can improve the dimensional range of the operative workpiece of lathe, reduces the machine tool structure size; The 3rd, the shaft strength situation is obviously improved, and temperature rise obviously reduces, and rotating speed and precision are higher.

But, the problem that the liquid that sliding bearing leaked before and after motor built-in type electricity main shaft in use existed is difficult to seal, if liquid such as oil that leaks or water are invaded motor stator and rotor, cause corrosion and insulation damages easily, shorten the working life of electric main shaft, cause maintenance cost to increase.Existing a kind of sealing configuration is offered circular groove on main shaft, offer the retaining liquid bath corresponding with circular groove on sliding bearing, and this structural requirement sliding bearing will have enough length, is not easy to the processing of sliding bearing, and precision is difficult to guarantee; Space between circular groove and the retaining liquid bath is little, is unfavorable for the circulation of sliding bearing drainage, and the drainage flow is few, and radiating effect is poor.

The model utility content

Technical problem to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of sliding bearing sealing configuration that maintenance process is good, rational in infrastructure, can effectively seal, avoid the electric main shaft of leak liquid corrosion electrical motor rotor to the liquid of sliding bearing end leakage that assembles is provided.

For solving the problems of the technologies described above, the utility model adopts following technical proposals.

The sliding bearing sealing configuration of electric main shaft of the present utility model, it comprises that rotor is loaded on the middle part, sliding bearing is sheathed on set slinger and flinger ring on the main shaft at two ends, main shaft is provided with annular groove, constitute slinger, this slinger is between sliding bearing and rotor, flinger ring is placed in outside the slinger, and be fixed in the end face of sliding bearing, the endoporus of this flinger ring is a shoulder hole, the aperture section of shoulder hole and main shaft socket, form the retaining sap cavity between the macropore Duan Zeyu slinger, the bottom of macropore section is provided with liquid port.

The aperture section of described flinger ring is provided with groove.

Compared with prior art, advantage of the present utility model is: main shaft is provided with slinger and the flinger ring that is formed by circular groove, the liquid that leaks from sliding bearing flows to slinger along main shaft, most of liquid is got rid of to the inwall of retaining sap cavity under action of centrifugal force, under the effect of gravity, flow to liquid port again, discharge through liquid port; Flinger ring is installed on the sliding bearing by fastening piece, and both separately make, and are convenient to the processing of sliding bearing; Form the retaining sap cavity between the macropore section of flinger ring and the slinger, its space is big, and the flowing medium that helps slinger is thrown to the flinger ring inwall concentrates in together, and discharges from the liquid port of lower end, heat is taken away good heat dissipation effect; On the endoporus that flinger ring and main shaft join, have annular groove, can prevent effectively that the liquid that is not got rid of by slinger on a small quantity from flowing out flinger ring along main shaft, avoids rotor and motor stator to be polluted.The utility model significantly improves the sealing of sliding bearing leakage liquid, has fundamentally protected motor stator and rotor, avoids motor corrosion and insulation damages, has prolonged the working life of electric main shaft.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Each label is represented among the figure:

1, main shaft 2, sliding bearing

3, rotor 4, flinger ring

5, retaining sap cavity 6, motor stator

11, slinger 41, liquid port

42, aperture section 43, macropore section

44, groove

Embodiment

As shown in Figure 1, the sliding bearing sealing configuration of electric main shaft of the present utility model, comprise that rotor 3 is loaded on the middle part, sliding bearing 2 is sheathed on set slinger 11 and flinger ring 4 on the main shaft 1 at two ends, main shaft 1 is provided with annular groove, constitute slinger 11, this slinger 11 is between sliding bearing 2 and rotor 3, flinger ring 4 is placed in outside the slinger 11, and be fixed in the end face of sliding bearing 2, the endoporus of this flinger ring 4 is a shoulder hole, and the aperture section 42 and main shaft 1 socket of shoulder hole form retaining sap cavity 5 between 43 of macropore sections and the slinger 11, the bottom of macropore section 43 is provided with liquid port 41, and the aperture section 42 of flinger ring 4 is provided with groove 44.

The liquid that leaks from the sliding bearing 2 that is positioned at main shaft 1 two ends, flow to slinger 11 along main shaft 1, most of liquid is thrown to the inwall of retaining sap cavity 5 under action of centrifugal force, under the effect of gravity, flow to liquid port 41 again, discharge through liquid port 41, the liquid splash that can effectively prevent sliding bearing 2 leakages is to rotor 3 that is loaded on main shaft 1 middle part and motor stator 6, wherein flinger ring 4 is installed on the sliding bearing 2 by fastening piece, flinger ring 4 is separate machined manufacturings with sliding bearing 2, and the machining accuracy of sliding bearing 2 guarantees easily; Flinger ring 4, sliding bearing 2 and main shaft 1 surround a retaining sap cavity 5, retaining sap cavity 5 spaces are big, the flowing medium that helps slinger 11 is thrown to flinger ring 4 inwalls concentrates in together, discharge from the outlet of lower end, heat is taken away, and good heat dissipation effect is provided with groove 4 on the endoporus that flinger ring 4 and main shaft 1 join, can prevent effectively that a small amount of liquid that is not got rid of by slinger 11 from flowing out flinger ring 4 along main shaft 1, avoids rotor 3 and motor stator 6 to be polluted.Experiment showed, that the utility model significantly improves the sealing of sliding bearing 2 leakage liquids, fundamentally protected rotor 3 and motor stator 6, avoid motor corrosion and insulation damages, prolonged the working life of motor and main shaft 1.

Claims (2)

1. the sliding bearing sealing configuration of an electric main shaft, it is characterized in that it comprises that rotor (3) is loaded on the middle part, sliding bearing (2) is sheathed on the main shaft (1) at two ends and goes up set slinger (11) and flinger ring (4), main shaft (1) is provided with annular groove, constitute slinger (11), this slinger (11) is positioned between sliding bearing (2) and the rotor (3), flinger ring (4) is placed in outside the slinger (11), and be fixed in the end face of sliding bearing (2), the endoporus of this flinger ring (4) is a shoulder hole, aperture section of shoulder hole (42) and main shaft (1) socket, macropore section (43) forms retaining sap cavity (5) then and between the slinger (11), and macropore section (43) bottom is provided with liquid port (41).

2. the sliding bearing sealing configuration of electric main shaft according to claim 1 is characterized in that the aperture section (42) of described flinger ring (4) is provided with groove (44).

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