CN85203674U - Dynamic and static pressure mixing bearing with hole ring surface throttle, shallow cavity and adjustable groove - Google Patents

Abstract

The utility model relates to a liquid dynamic and static pressure mixing radial bearing which uses a circular hole formed by an outlet of a shaft entering hole and the surface of a main shaft to carry out the first internal throttling and then uses a shallow cavity to carry out the second internal throttling. One of three oil pads of the utility model is cut off with the bearing to form an n shape and become a movable adjustable groove. The clearance between the movable adjustable groove and the main shaft can be adjusted by the oil pressure of the back side, and the bearing capacity of the dynamic and static pressure and the stiffness can be increased by two to three times. When two old M131 external cylindrical grinding machines are modified by the bearing to carry out coarse grinding, the maximum unit feed can reach 0.5 millimeters, the refining luminosity can reach inverted triangles 11 and 12, and all of the out-of-roundness is smaller than one micron.

Description

Dynamic and static pressure mixing bearing with hole ring surface throttle, shallow cavity and adjustable groove

The invention belongs to fluid lubrication category in " mechanology ".The main shaft bearing that is used for common or high-precision grinder also can be used for the supporting of other precision bearing systems.

Hybrid bearing is a kind of novel bearing that has both the two advantage of " static pressure " and " dynamic pressure " sliding bearing that grows up simultaneously on the basis of static pressure technical development.Most hybrid bearings all gradually adopt shallow cavity configuration and " line formula fuel feeding " (promptly opening the oil supply fuel feeding at the axial or circumferencial direction of bearing) to pass through " throttling of shallow chamber " then in the disclosed at home and abroad at present data, and the static pressure bearing capacity of this bearing is generally all on the low side; The flow controller that also has the utilization of minority bearing to add though this method increases to some extent to the static pressure bearing capacity, adds flow controller and easily stops up and process trouble, seldom actual the employing.

The objective of the invention is in order to overcome above two kinds of shortcomings, and the hydrodynamic and hydrostatic pressure combined bearing of a kind of new structure of developing.Its feature is that " cellular type fuel feeding " passes through " the cellular type ring restrictor adds the throttling of shallow chamber " then.

Structure of the present invention such as Fig. 1, Fig. 2 and Fig. 3, Fig. 4 are made up of bearing body (1) and steel bushing (2), and (1) and (2) is assembled together with the Spielpassung of 0～0.005mm.Fig. 1, Fig. 2 are the erection drawings of (1) and (2), and Fig. 3, Fig. 4 are the parts drawings of bearing body (1).The sense of rotation of main shaft is seen Fig. 3 for ω j().The internal surface of bearing body (1) is by three central angle θ ₁=20 °～40 ° axial oil-return groove A is divided into three θ with bearing surface ₂=80 °～100 ° lubricating pad B, the shallow oil pocket C(that has the degree of depth on each lubricating pad and be 0.02mm sees Fig. 1).Oil pocket is symmetrical vertically, and promptly two end axles is the (see figure 2) that equates to sealing oil edge D, along the circumferential direction is asymmetric.The circumferential sealing oil edge of upstream is narrow, θ ₃=8 °～10 °, the circumferential oil sealing hem width in downstream, θ ₄=15 °～20 °.Apart from upstream θ ₃Located an oil inlet hole d for=15 °～20 ° ₀, diameter is that φ 1～φ 3mm(sees Fig. 1).The outer round surface of bearing body is milled with θ ₆=240 ° of annular oil groove (see figure 3)s communicate with three oil inlet holes.Lubricating pad upper edge two side direction sealing oil edge outer rims in three lubricating pads, with the circumferential sealing oil edge outer rim in downstream, cutting out Contraband shape groove E is drilled with two obstructed tapped hole F(vertically and sees Fig. 4 on its upstream outer round surface), the pressure measurement aperture G(that is drilled with φ 1mm in distance axial edge l=25mm place (see figure 2) sees Fig. 1).

A control oil pocket H is arranged on the internal surface of steel bushing (2), cut out the corresponding installation of lubricating pad of Contraband shape groove, by hole on the steel bushing and the screw thread F on the bearing, bearing (1) and steel bushing (2) are tightened together with two screws with bearing body.

Be drilled with three tapped holes, wherein I in the end of steel bushing (2) ₁Communicate I with the control oil pocket ₂The (see figure 2) that communicates with 240 ° of circular grooves on the cylindrical of bearing body, I ₃(see figure 1) communicates with φ 1 pressure measurement aperture G.

Characteristics of the present invention are simple in structure, are easy to commercialization and seriation, are convenient to reequip old lathe, use safety " seize " can not take place, and can increase the bearing capacity and stiffness of bearing. The present invention has two kinds of structures, one be one piece watt adjustable, the fit diameter gap of bearing and axle is 0.036～0.040mm, its bearing capacity and stiffness is than watt nonadjustable big 1～2 times, its structure as mentioned above, it is two for watt non-adjustable (be not cut Contraband shape groove on the body, do not control oil pocket on the steel bushing), and the fit diameter gap of bearing and axle is 0.024～0.028mm. Once reequiped two old M131W universal grinding machine externals with a watt nonadjustable structure, wherein one dispatched from the factory 25 years, and another dispatched from the factory 14 years, the griffith woodsorrel herb that replaces former lathe with this bearing, remaining parts is not changed, and has used at present more than a year and 2 years, and grinding luminosity reaches respectively

11 Hes

12, the garden degree is not all less than 1 micron, than all improving the 1-2 level before the repacking. Roughly grind a depth of cut maximum and can reach 0.5mm, bigger raising Production efficiency, make a machine tool both can carry out roughing, can carry out fine finishining again.

Claims (4)

1, a kind of hybrid bearing, this bearing has a body (1) and steel bushing (2), it is characterized in that " cellular type fuel feeding " and " the cellular type ring restrictor adds the throttling of shallow chamber ", promptly apart from 16 °～20 ° of sealing oil edges a diameter being arranged in the upstream, shallow chamber of bearing is 1～3 millimeter fuel feeding aperture, there is 8 ° the narrow limit of import oil sealing upstream, shallow chamber, there is 15 °～20 ° outlet oil sealing broadside in the downstream, there is the sealing oil edge greater than 8 millimeters at two ends, the shallow chamber degree of depth equals 1～1.5 times of bearing cooperation radius clearance, and the fit diameter gap of bearing and outer steel sleeve is 0～0.005 millimeter.

2, bearing according to claim 1, it is characterized in that the lubricating pad number is three, each institute is 80 °～100 ° to central angle, one of them and bearing are cut into Contraband shape, the one side of Qie Kaiing is not with two screws and fastening adjustable watt of becoming beam type of bearing outer steel sleeve, and the fit diameter gap of this bearing and main shaft is 0.036～0.040 millimeter.

3, bearing according to claim 2 is characterized in that adjustable watt of back side static pressure oil pocket directly is engraved on the outer steel sleeve, and there is the sealing oil edge greater than 8 millimeters on oil pocket four limits, and the oil pressure in the oil pocket carries out step-less adjustment by outside reduction valve.

4, bearing according to claim 1 is characterized in that the lubricating pad number can make 3～6, and no adjustable watt, this bearing and main shaft fit diameter gap are 0.024～0.028 millimeter.

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