CN101060262A

CN101060262A - Built-in type hybrid motor spindle

Info

Publication number: CN101060262A
Application number: CN 200710035040
Authority: CN
Inventors: 熊万里; 邓新春
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-31
Filing date: 2007-05-31
Publication date: 2007-10-24

Abstract

The disclosed built-in dynamic-static piezoelectric shift for motor comprises: a primary shift with ends supported in two bearings, a shell, a front bearing set in front the shell, a back bearing connecting with the back end of the shell, a base for the back bearing, a stator and a rotor both arranged in middle of the primary shift, wherein there is plummer bearing assembled on back end of the back bearing, a lock nut fixes the plummer bearing on the primary shift; there is gap between the front/back end of plummer bearing and back bearing/back end cover, respectively; and it fills fluid medium in the front and back end gaps. This invention is low cost and long life time, and has well processing performance.

Description

Built-in type hybrid motor spindle

Technical field

The present invention relates to mechanical manufacturing field, relate in particular to the improvement of built-in type hybrid motor spindle.

Background technology

With high cutting speed, high feed speed, high manufacturing accuracy is that the high speed and precision processing of principal 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 machining tool not only has high production efficiency, and can improve the machining accuracy and the surface quality of part significantly.The electric 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 machining tool.The electricity main shaft is a kind of high-tech product that directly depends on the height electromechanical integration of technology such as bearing technology, accurate manufacturing and assembling.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 Fast starting of moment of 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, high 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.

The fluid sliding bearing is because the effect that bearing capacity is strong, lubricant medium has damping vibration attenuation and " homogenizing " error, therefore adopt the fluid sliding bearing as the machine tool chief axis good rigidly, the rotating accuracy height that support, be very suitable for support unit as precision machine tool such as precision grinder and fine boring machine electricity main shaft.Adopt the fluid sliding bearing often to be divided into motor postposition formula structure and motor built-in type structure at present on the engineering as the electric main shaft that supports.Motor postposition formula structure, promptly electric machine rotor is positioned at the rear end of front and back bearings, has following weakness: the one, physical dimension is big, is unfavorable for the machine tool structure densification; The 2nd, because weight is big, the interpolation low-response, wheel profile face machining accuracy is difficult to guarantee; The 3rd, cause the load unbalance loading easily, unbalance loading load causes easily that the shaft strength situation is poor, bearing temperature rise raises, and is unfavorable for raising speed and precision.If adopt the built-in type hybrid motor spindle 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 processing easily, can improve the size range of the processing work 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 there is the difficulty of assembling, dismounting and debugging maintenance in built-in type hybrid motor spindle in making use.Common and the main shaft employing monolithic construction of the thrust bearing of existing fluid dynamic and static pressure machine tool chief axis; and thrust bearing is in manufacturing, assembling and use; can be one of the highest position of maintenance rate usually owing to reason generation seize or scrapings such as the thrust surface error of perpendicularitys.

The patent No. is that the patent of invention of ZL200420069406.7 discloses a kind of built-in type hybrid motor spindle, its thrust bearing and electric main shaft are integral type, motor places the centre of former and later two bearings, can only enter housing from the main shaft small end during assembling, can only dismantle rear support, rotor etc. earlier during the maintenance thrust bearing, take out main shaft from the housing front end again, disassembly process is very loaded down with trivial details, not only maintenance load is big, and the fractionation of antero posterior axis bearing causes the axiality variation in front and back bearings hole, the precision of the electric main shaft after causing keeping in repair and overall performance reduction easily; Also must clamp whole main shaft during the maintenance thrust bearing, it is very inconvenient to operate, and length consuming time influences manufacturing schedule.

The patent No. is that the patent of invention of ZL200410046640.2 discloses dress floating ring formula dynamic/static piezoelectric main shaft in a kind of motor, owing to adopted complicated floating ring structure, require very high to design accuracy and anufacturability, its structural parameters and technological parameter are difficult for coupling, and since the rigidity of axis system be by between bearing and the floating ring and floating ring with spool between the LAYER FLUID film " connect and form ", than the axis system that adopts individual layer fluid film sliding bearing, its integral stiffness is low, the electric main shaft cost cost height and the rigidity of this labyrinth are on the low side, are unfavorable for popularization and application.

Built-in type hybrid motor spindle causes failing at present fully to be used on lathe owing to there is above-mentioned defective, fails to realize the production in enormous quantities as the Elementary Function parts.

Summary of the invention

Technical problem to be solved by this invention is to overcome above-mentioned the deficiencies in the prior art, and a kind of good cooling results, rational in infrastructure, the built-in type hybrid motor spindle that can realize machine tooling high speed, precise treatment are provided.

For solving the problems of the technologies described above, the present invention adopts following technical proposals.

Built-in type hybrid motor spindle of the present invention, comprise main shaft, housing, fore bearing, rear bearing, rear bearing block, motor stator and rotor, described fore bearing is installed in the housing front end, rear bearing block links to each other with the housing rear end, rear bearing is installed in the rear bearing block, the two ends of main shaft are supported on respectively in fore bearing and the rear bearing, motor stator and rotor are installed in the middle part of main shaft, described rear bearing rear end installing thrust bearing, thrust bearing is fixed on the main shaft by locking nut, the thrust bearing rear end is provided with rear end cap, rear end cap is fixed on the rear bearing block, be provided with preceding splaying between thrust bearing front end and the rear bearing, be provided with the splaying, back between thrust bearing rear end and the rear end cap, being full of in preceding splaying and the splaying, back has fluid media (medium).

The outer wall of described rear bearing is provided with cannelure, fluid film passage and back fluid film passage before rear bearing is provided with, preceding fluid film passage and back fluid film passage are communicated with by cannelure, rear end cap is provided with the fluid passage, rear bearing block is provided with the total fluid passage that is communicated with cannelure, preceding fluid film passage is communicated with the preceding splaying of thrust bearing, and back fluid film passage is communicated with the back splaying of thrust bearing by the fluid passage.

Be provided with adjusting pad between described rear end cap and the rear bearing, adjusting pad is placed in outside the thrust bearing, and adjusting pad is provided with the fluid bore that is communicated with back fluid film passage and fluid passage.

The rear end of described fore bearing and the front end of rear bearing respectively are connected with a baffle ring that is placed on the main shaft, be provided with ring-shaped groove in the baffle ring corresponding position on the main shaft, constitute and get rid of ring, the endoporus of baffle ring is a shoulder hole, the aperture section of shoulder hole and main shaft socket, macropore Duan Zeyu gets rid of and forms cavity between the ring, and the macropore pars infrasegmentalis is provided with outlet.

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

Described fluid media (medium) is fluid or water liquid or gas.

Be arranged with the water shutoff cover in the described housing, be provided with stop screw between water shutoff cover and the housing, motor stator is fixed in the housing by the water shutoff cover.

Compared with prior art, the invention has the advantages that: housing of the present invention is made the split-type structure, at rear bearing rear end installing thrust bearing the main shaft axial motion is carried out spacingly, makes installation, location and the dismounting of motor stator easy to maintenance.Thrust bearing and main shaft are divided into two parts, and thrust bearing is as consumable accessory, when needs overhaul, only need change thrust bearing, simplify disassembly process, assemble and keep in repair very convenient quick, shortened production cycle and maintenance time, helped enhancing productivity.Of the present invention simple in structure, low to design accuracy and manufacture process requirement, be convenient to processing and manufacturing, the cost cost is low, helps popularization and application; Baffle ring is housed on front and back bearings, on main shaft, is provided with and gets rid of ring, can prevent effectively that fluid is splashed on motor stator and the rotor, avoid motor stator and rotor to be corroded, prolonged useful life; The water shutoff cover is set between housing and motor stator, directly between water shutoff cover and front-end bearing pedestal, stop screw is set, prevent that water shutoff cover and motor stator from rotating with respect to housing, minimizing is fixed in the required part of housing with motor stator, shorten the axial dimension and the radial dimension of electric main shaft integral body, saved material and processing cost.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the partial enlarged drawing at clamping stopper bearing of the present invention place.

Each label is represented among the figure:

1, fore bearing 2, rear bearing

3, motor stator 4, rotor

5, main shaft 6, housing

7, stop screw 8, water shutoff cover

9, thrust bearing 10, rear end cap

11, adjusting pad 12, total fluid passage

13, baffle ring 14, locking nut

21, preceding fluid film passage 22, back fluid film passage

23, cannelure 51, get rid of ring

61, rear bearing block 91, preceding splaying

92, splaying 101, back, fluid passage

111, fluid bore 131, aperture section

132, macropore section 133, cavity

134, outlet 135, groove

Embodiment

As shown in Figure 1, 2, built-in type hybrid motor spindle of the present invention, comprise main shaft 5, housing 6, fore bearing 1, rear bearing 2, rear bearing block 61, motor stator 3 and rotor 4, fore bearing 1 is installed in housing 6 front ends and by set flange on the fore bearing 1 and locatees, rear bearing block 61 links to each other by securing member with housing 6 rear ends, rear bearing 2 is installed in the rear bearing block 61 and by set flange on the rear bearing 2 and locatees, the two ends of main shaft 5 are supported on respectively in fore bearing 1 and the rear bearing 2, and motor stator 3 and rotor 4 are installed in the middle part of main shaft 5.Be arranged with water shutoff cover 8 in the housing 6, motor stator 3 overlaps 8 interference fit with water shutoff, be provided with stop screw 7 between water shutoff cover 8 and the housing 6, stop screw 7 is fastening with housing 6 with water shutoff cover 8, prevent that water shutoff cover 8 from rotating relative to housing 6 with motor stator 3, the mode of rotor 4 employing interference fit is fixed on the main shaft 5.Rear bearing 2 rear ends installing thrust bearing 9, thrust bearing 9 is fixed on the main shaft 5 by locking nut 14, thrust bearing 9 rear ends are provided with rear end cap 10, be provided with adjusting pad 11 between rear end cap 10 and the rear bearing 2, rear end cap 10, adjusting pad 11 and rear bearing 2 are fixed on the rear bearing block 61 by securing member, adjusting pad 11 is placed in outside the thrust bearing 9, be provided with preceding splaying 91 between thrust bearing 9 front ends and the rear bearing 2, be provided with splaying 92, back between thrust bearing 9 rear ends and the rear end cap 10, the outer wall of rear bearing 2 is provided with cannelure 23, fluid film passage 21 and back fluid film passage 22 before rear bearing 2 is provided with, preceding fluid film passage 21 and back fluid film passage 22 are communicated with by cannelure 23, adjusting pad 11 is provided with fluid bore 111, rear end cap 10 is provided with fluid passage 101, rear bearing block 61 is provided with the total fluid passage 12 that is communicated with cannelure 23, preceding fluid film passage 21 is communicated with the preceding splaying 91 of thrust bearing 9, back fluid film passage 22 is communicated with the back splaying 92 of thrust bearing 9 by fluid bore 111 and fluid passage 101 successively, and being full of in preceding splaying 91 and the splaying 92, back has fluid media (medium).Fluid media (medium) is a fluid, also can be water liquid or gas.When thrust bearing 9 rotates with main shaft 5, preceding splaying 91 makes thrust bearing 9 directly not contact the rear end face of rear bearing 2 and the front end face of rear end cap 10 with the fluid media (medium) that the back is full of in the splaying 92, avoid the wearing and tearing of thrust bearing 9, simultaneously again can be to the position-limiting action that moved axially of main shaft 5.The front end of the rear end of fore bearing 1 and rear bearing 2 respectively is connected with a baffle ring 13 that is placed on the main shaft 5, be provided with ring-shaped groove in baffle ring 13 corresponding positions on the main shaft 5, constitute and get rid of ring 51, the endoporus of baffle ring 13 is a shoulder hole, the aperture section 131 and main shaft 5 sockets of shoulder hole, 132 of macropore sections and get rid of and form cavity 133 between the ring 51, the bottom of macropore section 132 is provided with outlet 134, the aperture section 131 of baffle ring 13 is provided with groove 135, groove 135 seals, this structure can prevent effectively that fluid is splashed on motor stator 3 and the rotor 4, avoids motor stator 3 and rotor 4 to be corroded, and has prolonged useful life.From the fore bearing 1 that is positioned at main shaft 5 two ends, the fluid that rear bearing 2 leaks, along main shaft 5 flow to get rid of the ring 51, most of fluid is thrown to the inwall of cavity 133 under action of centrifugal force, under the effect of gravity, flow to outlet 134 again, discharge through outlet 134, can prevent effectively that the fluid that fore bearing 1 and rear bearing 2 leak from splashing in the rotor 4 and motor stator 3 that is loaded on main shaft 5 middle parts, wherein each baffle ring 13 is installed on fore bearing 1 and the rear bearing 2 by securing member respectively, baffle ring 13 is a separate machined manufacturing with two bearings, and the machining accuracy of bearing guarantees easily; Baffle ring 13, fore bearing 1 (rear bearing 2) and main shaft 5 surround a cavity 133, and cavity 133 spaces are big, help concentrating in together getting rid of ring 51 fluid media (medium)s that are thrown to baffle ring 13 inwalls, discharge from the outlet 134 of lower end, heat are taken away good heat dissipation effect.The aperture section 131 of joining at baffle ring 13 and main shaft 5 is provided with groove 135, can effectively prevent from not got rid of on a small quantity ring 51 fluids that get rid of and flow to rotor 4 and motor stator 3 along main shaft 5, avoids rotor 4 and motor stator 3 to be polluted.

The present invention is divided into two parts with thrust bearing 9 and main shaft 5, after can earlier main shaft 5, motor stator 3, rotor 4, fore bearing 1, rear bearing 2, housing 6 and rear bearing block 61 being assembled during assembling, again thrust bearing 9 is inserted in from the rear end of main shaft 5, fastening with locking nut 14, because when electric main shaft is worked, thrust bearing 9 is positions of relatively easy wearing and tearing, in case need overhaul thrust bearing 9 time, only need thrust bearing 9 pulled down to grind or change from main shaft 5 rear ends to get final product.(if adopt main shaft 5 and thrust bearing 9 integral structures, just must earlier housing 6 and rear bearing block 61 be taken apart, again rotor 4 and main shaft 5 be taken apart, main shaft 5 be taken out thrust bearing 9 is keeped in repair the operation very complicated again.) this shows, adopt thrust bearing 9 and main shaft 5 separated structures, can significantly improve assembling, dismounting and the maintenance process of built-in type hybrid motor spindle, shorten the cycle of making and keeping in repair, reduce and make and maintenance cost, engineering is used very convenient.

Claims

1, a kind of built-in type hybrid motor spindle, comprise main shaft (5), housing (6), fore bearing (1), rear bearing (2), rear bearing block (61), motor stator (3) and rotor (4), it is characterized in that described fore bearing (1) is installed in housing (6) front end, rear bearing block (61) links to each other with housing (6) rear end, rear bearing (2) is installed in the rear bearing block (61), the two ends of main shaft (5) are supported on respectively in fore bearing (1) and the rear bearing (2), motor stator (3) and rotor (4) are installed in the middle part of main shaft (5), described rear bearing (2) rear end installing thrust bearing (9), thrust bearing (9) is fixed on the main shaft (5) by locking nut (14), thrust bearing (9) rear end is provided with rear end cap (10), rear end cap (10) is fixed on the rear bearing block (61), be provided with preceding splaying (91) between thrust bearing (9) front end and the rear bearing (2), be provided with splaying (92), back between thrust bearing (9) rear end and the rear end cap (10), being full of in preceding splaying (91) and the splaying, back (92) has fluid media (medium).

2, built-in type hybrid motor spindle according to claim 1, the outer wall that it is characterized in that described rear bearing (2) is provided with cannelure (23), fluid film passage (21) and back fluid film passage (22) before rear bearing (2) is provided with, preceding fluid film passage (21) and back fluid film passage (22) are communicated with by cannelure (23), rear end cap (10) is provided with fluid passage (101), rear bearing block (61) is provided with the total fluid passage (12) that is communicated with cannelure (23), preceding fluid film passage (21) is communicated with the preceding splaying (91) of thrust bearing (9), and back fluid film passage (22) is communicated with the back splaying (92) of thrust bearing (9) by fluid passage (101).

3, built-in type hybrid motor spindle according to claim 2, it is characterized in that being provided with adjusting pad (11) between described rear end cap (10) and the rear bearing (2), adjusting pad (11) is placed in outside the thrust bearing (9), and adjusting pad (11) is provided with the fluid bore (111) that is communicated with back fluid film passage (22) and fluid passage (101).

4, according to claim 1 or 2 or 3 described built-in type hybrid motor spindles, it is characterized in that the rear end of described fore bearing (1) and the front end of rear bearing (2) respectively are connected with a baffle ring (13) that is placed on the main shaft (5), main shaft (5) is gone up and is provided with ring-shaped groove in baffle ring (13) corresponding position, constitute and get rid of ring (51), the endoporus of described baffle ring (13) is a shoulder hole, aperture section of shoulder hole (131) and main shaft (5) socket, macropore section (132) then and get rid of and form cavity (133) between the ring (51), macropore section (132) bottom is provided with outlet (134).

5, built-in type hybrid motor spindle according to claim 4 is characterized in that the aperture section (131) of described baffle ring (13) is provided with groove (135).

6, built-in type hybrid motor spindle according to claim 5 is characterized in that described fluid media (medium) is fluid or water liquid or gas.

7, according to the described built-in type hybrid motor spindle of claim 6, it is characterized in that being arranged with in the described housing (6) water shutoff cover (8), be provided with stop screw (7) between water shutoff cover (8) and the housing (6), motor stator (3) is fixed in the housing (6) by water shutoff cover (8).

8,, it is characterized in that described fluid media (medium) is fluid or water liquid or gas according to claim 1 or 2 or 3 described built-in type hybrid motor spindles.

9, according to claim 1 or 2 or 3 described built-in type hybrid motor spindles, it is characterized in that being arranged with in the described housing (6) water shutoff cover (8), be provided with stop screw (7) between water shutoff cover (8) and the housing (6), motor stator (3) is fixed in the housing (6) by water shutoff cover (8).