CN2151308Y

CN2151308Y - Lift transmission with worm and rack

Info

Publication number: CN2151308Y
Application number: CN 92240235
Authority: CN
Inventors: 李玉珊
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-12-16
Filing date: 1992-12-16
Publication date: 1993-12-29
Anticipated expiration: 2002-12-16

Abstract

The utility model relates to a lift transmission with a worm and a rack bar, which is used for drilling and milling machines and composed of a worm, a worm wheel and a rack bar. The worm rack bar is the circular rack bar type. The structural form that the worm is engaged with the worm wheel, and the worm wheel is engaged with the worm rack is adopted. The traditional transmission structure that a worm is engaged with a spiral gear, and the spiral gear is engaged with a helical gear is replaced. The utility model has the advantages of reasonable structure, stable rotation, long service life, simple processing and steel saving. The defect that a machine head is rocked horizontally is solved, and the processing precision is increased. The utility model is suitable for vertical type and table type drilling machines and drilling, milling and grinding machines.

Description

Lift transmission with worm and rack

The utility model disclose a kind ofly be used to bore, the Worm-rack type lifting actuator of milling machine.

At present, vertical drilling machine in the domestic electronic product, drilling and milling machine, " elevator mechanism of headstock or head " in little beakiron, the first-class product of milling power be the side's of employing tooth bar type of belt drive all, its basic transmission principle is: worm screw nibbles spiral gear, and the spiral gear side of nibbling helical rack is realized vertical motion.Abroad, also be to adopt this mechanism as ZX-28 drilling and milling machine from the processing according to investor's samples of West Germany Mark company.The latch phenomenon in use takes place in this driving mechanism often, makes transmission not steady, and gear wear is fast, and operation simultaneously is effort also.

For fear of above-mentioned deficiency, the purpose of this utility model is to provide a kind of stable drive, long service life, and the Worm-rack type lifting actuator of rapid operation substitutes traditional square helical rack transmission device.

For achieving the above object, the utility model has adopted following technical measures.

The Worm-rack type lifting actuator is made up of worm screw, worm gear and tooth bar, and different is that the tooth bar that adopts is circular worm rack, promptly is installed in the input worm and wheel engagement in the housing, worm gear and the worm rack engagement that is fixed on the column.

Above the modulus of said worm screw, worm gear, worm rack identical, be 0.5-8 according to the general modulus of requirement of lathe.

In order to further specify feature of the present utility model, described below in conjunction with accompanying drawing.

Fig. 1 Worm-rack type lifting actuator structural representation;

Fig. 2 A-A generalized section;

Among the figure: 1 interstage sleeve, 2 worm racks, 3 worm gears, 4 worm-wheel shafts, 5 fastening screw trip bolts, 6 housings, 7 screw rods, 8 bearings, 9 garden taper pins, 10 bearing pressure rings, 11 screws, 12 column locking blocks, 13,14 screws.

Accompanying drawing is one of them embodiment.As shown in the figure, when screw rod rack-type lifting actuator is installed in brill, mills, in the headstock housing of boring, grinding machine, worm rack is fixed on when working on the column, rotating screw bolt, worm meshing worm gear, the wormgear engaging worm tooth bar, forcing tooth bar is guide rail along self both sides, realizes headstock vertical movement up and down.

The utility model is installed on the milling machine, during work, and the worm meshing worm gear, the wormgear engaging worm tooth bar drives column and moves up and down, and realizes the purpose of lifting.

When this lifting actuator was installed in milling machine, the modulus of worm gear, worm screw and worm rack was 2-8.

When this device was installed in little beakiron, vertical drilling machine, its modulus was 0.5-4.

The Worm-rack type lifting actuator advantage of comparing with square helical rack formula lifting actuator is as follows:

1, rational in infrastructure, worm screw, worm gear, worm rack are axial module, and tooth pitch is consistent, are multiple tooth several line Contact Transmission during rotation, and contact is even, stable drive, and engagement is normal, increases the service life 2-3 times, rapid operation.

2, worm gear is that arc surface contacts with worm rack, and it is strong to make mental and physical efforts by oneself, does not have horizontal motility, has overcome about square tooth bar and has moved about, and causes the head level to wave defective, the equipment precision height.

3, cost is low, worm rack processing is simple, saves steel, compare with the square tooth bar of same modulus, but saving steel 30%.

Claims

1, a kind of Worm-rack type lifting actuator is made up of worm screw, worm gear, tooth bar, it is characterized in that tooth bar is circular worm rack, promptly is installed in input worm screw 7 and worm gear 3 engagements in the housing, worm gear and worm rack 2 engagements that are fixed on the column.

2, Worm-rack type lifting actuator according to claim 1 is characterized in that worm screw, worm gear, worm rack modulus are identical, and modulus is 0.5-8.