CN2298366Y

CN2298366Y - No-support plastic sliding bush

Info

Publication number: CN2298366Y
Application number: CN 96222018
Authority: CN
Inventors: 李翰
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-21
Filing date: 1996-10-21
Publication date: 1998-11-25
Anticipated expiration: 2006-10-21

Abstract

The utility model relates to a non-support plastic sliding bushing which is a part of the sliding bearing class and is particularly suitable for thrust bearings of various hydroelectric generating sets. The bushing uses teflon as material of the bushing surface, and the using performance is superior to the using performance of a babbitt metal bushing and is the same as the using performance of an elastic metal plastic bushing. A plastic layer of the bushing surface is directly connected with a bushing base, and the connection has three modes. As the three connection modes do not need a bronze porous layer to be used as transition, the structure is simpler than the structure of the elastic metal plastic bushing, and the manufacturability is better than the manufacturability of the elastic metal plastic bushing; the utility model is made without consuming large manual labor.

Description

There is not the plastics of support Sliding bush

It is a kind of versatility mechanical parts of sliding bearing class that the nothing that the utility model patent proposes is relied on plastics Sliding bush (be called for short and do not have the plastic made tile of support), is mainly used in the thrust-bearing of all kinds of hydraulic generator units.

The conventional babbit-lined metal that uses of hydraulic generator set thrust bearing.Though this bearing shell has the use history of length, also exist and use operation to require shortcomings such as height, maintenance difficulty.Especially for the large-scale heavy duty thrust-bearing, operational reliability is poor, will cause by the major accident of forced-stopping machine in case tile kilning takes place.The former Soviet Union in 1974 at first develops elastic metal plastic tile and is applied to the Large Hydroelectric Set thrust-bearing and succeeds.According to " new development of hydraulic generator set thrust bearing " (Shen Weiyi, " water power plant mechanical ﹠ electrical technology ", 1989 the 1st phases), " operating experience of metallo-plastic resilient tile thrust-bearing " (Ah row's Keshan Jean-Yves Le D, " east motor ", 1989 the 4th phases) data introduction such as, elastic metal plastic tile has the bearing capacity height, is suitable for the characteristics that velocity range is big, temperature rise is low, safe and reliable to operation, is specially adapted to the jumbo that various loads are big, operating conditions is harsh.China began the elasticity of import metal plastic tile in 1989, and the development of elastic metal plastic tile afterwards also launches at home, overlapped homemade 30,000,000 Ns of large-scale elastic metal plastic tiles of level to 1993 first and formally put into operation in China.

The chemical stability of teflon is very high, and is extremely difficult bonding securely with other materials.Just owing to this, the method of various manufacturing polytetrafluoroethylmaterial material bearing shells (cover) on the our times, all be together bar none teflon and (copper wire or the copper powder are made) pressing of bronze porous layer or sintering, bronze layer and steel watt base then links up with soldering or sintering process, makes a tiling and a watt base connect into an integral body.The purpose of the utility model patent is intended to propose a kind of new structural type, replace to rely on the form of bronze layer as transition, makes teflon be combined together to form to connect reliably directly or by a soldering and a bonding and watt base and carries.The bearing shell of so making can reach the using effect identical with elastic metal plastic tile equally.

Do not have to rely on the tiling material of plastic made tile can select for use pure or through filling-modified polytetrafluoroethylplastic plastic.The typical additives of teflon has glass fibre, copper powder, molybdenum disulfide or the like.These additives can use separately, also can unite use.The total content of additive in the modified Teflon plastics is 0～45% (weight percentage).

Not having the plastic made tile of support polytetrafluoroethylplastic plastic layer is the chimeric of certain geometrical construction with being connected of watt base purely, and the centre does not have bronze porous layer.Do not have and rely on the structural type of plastic made tile attachment portion that three kinds of different types are arranged.One type is as shown in Figure 1, watt polytetrafluoroethylplastic plastic layer (1) be connected with dovetail groove mutually with a watt base (2).For this Placement, require on the mating face of polytetrafluoroethylplastic plastic layer (1) and watt base (2), all to process corresponding dovetail groove respectively.Another kind of type as shown in Figure 2, its mode is only to process dovetail groove on the mating face of polytetrafluoroethylplastic plastic layer (1), and the plane is processed on the mating face of watt base (2).Utilize brazing filler metal or technique for sticking to make polytetrafluoroethylplastic plastic layer (1) closely chimeric by dovetail groove with leypewter or adhesive (3), leypewter or adhesive (3) then engage with the plane with a watt base (2).The third mode is similar to plastics riveted joints, as Fig. 3 as showing.This mode is to rely on the numerous plastics of falling the taper " rivet " that distribute on polytetrafluoroethylplastic plastic layer (1) mating face and cone shape hole on watt base (2) to engage formation to be connected reliably.More than three kinds of applicable situations that different Placements is had nothing in common with each other, first kind of structure is applicable to making radially watt, second kind of structure is applicable to makes the plane thrust bearing shoe valve, the third structure then is suitable for making the thin bearing shell of watt base.

The thickness of polytetrafluoroethylplastic plastic layer is not if comprise that with watt part that base is connected be 2 to 7 millimeters.The section configuration of attachment portion as shown in Figure 1 to Figure 3.Cross-section size does not have concrete regulation, can do suitably to select according to the size of suffered load height of bearing shell and bearing shell, requires selected size can guarantee the enough fastness that connect.

Do not have to rely on the polytetrafluoroethylene floor of plastic made tile to have good friction and wear characteristic, especially not can with adhesive wear is taken place in the part that rubs (steel), therefore have higher operational reliability than babbitt metal bearing, using effect is identical with elastic metal plastic tile.Not having another advantage of the plastic made tile of support is the simplification of structure.Cancellation bronze porous layer has been saved duty heavy metals such as copper, tin, the workman needn't bear a large amount of hand labours again, has shortened the process-cycle, has reduced cost, the quality of product is also more guaranteed.

The example of nothing support plastic made tile as shown in Figure 4.584 millimeters of this tile-base surface external diameters, 206.75 millimeters of big end chord lengths, 85.73 millimeters of small end chord lengths, Mean length is 156.35 millimeters, 10 millimeters of polytetrafluoroethylplastic plastic layer total thicknesses (comprising the dovetail groove part), select the linkage structure of second kind of form for use, every cover bearing is formed by 8 pieces watts, is used for hydraulic generator set thrust bearing.

Claims

1. one kind with polytetrafluoroethylplastic plastic or the filling-modified type polytetrafluoroethylplastic plastic plastics Sliding bush as the tiling material, it is characterized in that tiling is made of monolayer material, being connected between tiling plastic layer and watt base can be that direct connection also can connect or to stick with glue agent bonding by soldering.

2. a kind of nothing according to claim 1 is relied on the plastics Sliding bush, it is characterized in that: plastic layer is chimeric mutually with oat tail groove structure with the Placement of watt base, or add soldering or bonding forming with oat tail groove structure, also can engage with the cone shape hole of watt base with plastic layer protrusion of surface " rivet " structure.