CN105298705A - Method for guaranteeing fastening of bearing and bushing through force measurement - Google Patents

Abstract

The invention belongs to the technical field of assembling of gear pump bearing assemblies and relates to a method for guaranteeing the inside diameter of a bushing after a bearing assembly is assembled, fastening of the bushing and a bearing and the long-term operation reliability of the bearing assembly. According to the method, the bushing (2) is fastened in the bearing (1) by controlling the pressure through which the bushing (2) is pressed into the bearing (1) to be within a specified range, and it is guaranteed that the bushing (2) cannot deform when pressed into the bearing and cannot get loose in the using process.

Description

A kind ofly ensure bearing and the fastening method of lining by dynamometry

Technical field

The invention belongs to gear pump shaft bearing assembly mounting technology field, relate to bearing unit assembling back bush internal diameter size and ensure, and lining and bearing is fastening, ensures the reliability of its long-term work.

Background technique

In aircraft engine fuel oil system, a large amount of gear pump that adopts is to fuel pressurization, to engine oil, requires that gear pump rotating speed is high, boosting capability strong, compact structure, lightweight, the life-span is long.For ensureing the above-mentioned ability to work of gear pump, require that in gear pump, the bearing structure of fixed gear is simple, bearing capacity is strong, lubricity is good, and require high with gear shaft surface of contact size and surface condition.For ensureing that bearing reaches above-mentioned requirements, generally adopt sliding bearing structure, and the composite material lining good to bearing press-in lubricity.

Because the processing of brearing bore and Outer Diameter of lining inevitably exists tolerance of size, after lining will inevitably be caused to load bearing, there is the situation of tightness difference.If lining press-in bearing tension can cause lining Internal Hole Deformation, the cooperation of impact and gear shaft; Lining press-in bearing is excessively loose, and in use due to gear shaft and lining relative movement, the contact force of existence can cause lining to loosen, and affects gear pump and normally works.Therefore must ensure that the lining tightness being pressed into bearing is suitable, after both having ensured lining press-in bearing, endoporus was indeformable, ensured that again lining in use can not loosen.

Summary of the invention

The object of the invention is: propose a kind of by control, measure lining press-in bearing power, ensure lining and bearing fastening.

Technological scheme of the present invention is: a kind ofly ensure bearing and the fastening method of lining by dynamometry, comprises the following steps:

First step determination lining 2 is pressed into the scope F1 ~ F2 of bearing 1 power, and detailed process is as follows: calculate lining (2) when gear pump works and be subject to the impacting force F of gear shaft, $F=\frac{1}{2}\×\frac{\mathrm{\α}}{180}\×\mathrm{\Δ}p\×D\×B$

α: the angle of gear pump outlet limit and main driven gear axis,

Δ p: the pressure reduction between gear pump import and export,

D: tip diameter,

B: the facewidth.

For after guarantee lining press-in bearing, endoporus is indeformable, ensure that again lining in use can not loosen, and chooses F1=1.2F, F2=1.6F.

Lining 2 is pressed in bearing 1 by press machine 3 by second step, forms bearing unit.Detailed process is as follows: be placed on by bearing 1 on press machine (3) base, lining 2 is vertically placed on bearing 1 upper end, adjustment press machine 3 moves down, lining 2 is pressed in the endoporus of bearing 1, and measure lining 2 and to be pressed in bearing 1 process press machine 3 downwards to lining 2 applied pressure, require press machine 3 downwards to the pressure of lining 2 within the scope of the F1 ~ F2 of regulation.

Advantage of the present invention is: being pressed into the pressure of bearing 1 in the scope that regulation requires by controlling lining 2, lining 2 being fastened in bearing 1, ensureing can not be out of shape in lining 2 process of press in, and can not loosen in using process.

Accompanying drawing explanation

Fig. 1 is the process schematic that lining 2 of the present invention is pressed into bearing 1;

Fig. 2 is bearing unit schematic diagram;

Fig. 3 is bearing schematic diagram;

Fig. 4 is lining schematic diagram;

Fig. 5 is press machine schematic diagram;

Fig. 6 is gear pump structure schematic diagram;

Fig. 7 is gear pump mesh schematic representation.

Embodiment

Below the present invention is described in further details.First step lining 2 is pressed into the determination of bearing 1 power scope F1 ~ F2:

According to gear pump having structure parameter: the angle α of gear pump outlet limit and main driven gear axis, gear pump import and export between pressure differential deltap p, tip diameter D, facewidth B, according to formula calculate lining (2) when gear pump works and be subject to the impacting force F of gear shaft, get F1=1.2F, F2=1.6F.Obtain lining 2 and be pressed into bearing 1 power scope F1 ~ F2.

Second step lining 2 is pressed into the detailed process of bearing 1:

See Fig. 1, by press machine 3, lining 2 is pressed in bearing 1, form bearing unit.Concrete press-in step is as follows: be placed on by bearing 1 on press machine (3) base, lining 2 is vertically placed on bearing 1 upper end, adjustment press machine 3 pressure arm moves down, lining 2 is pressed in the endoporus of bearing 1, in process of press in, show lining 2 by press machine 3 to be pressed in bearing 1 process pressure arm downwards to lining 2 applied pressure, require pressure arm downwards to the pressure of lining 2 within the scope of regulation minimum force F1 and maximum, force F2.

Before carrying out lining 2 and being pressed into bearing 1, arrange the downward pressure maximum of press machine 3 pressure arm is F2.Lining 2 is pressed in the process of bearing 1, if the power recording press-in is less than F1, directly lining 2 is extruded bearing 1, and more resleeve 2; If the power recording press-in is greater than F2, lining 2 cannot be pressed into bearing 1, more resleeve 2; If the power recording press-in is between F1 ~ F2, lining 2 is pressed into position suitable in bearing 1, forms bearing unit.

Due to by controlling its pressing-in force in predetermined range, both ensure that lining 2 was indeformable in process of press in, and can ensure that again in use lining 2 can not loosen.

Claims (1)

1. ensure bearing and the fastening method of lining by dynamometry, it is characterized in that, comprise the following steps:

First step determination lining 2 is pressed into the scope F1 ~ F2 of bearing 1 power, and detailed process is as follows: calculate lining (2) when gear pump works and be subject to the impacting force F of gear shaft,

α: the angle of gear pump outlet limit and main driven gear axis,

Δ p: the pressure reduction between gear pump import and export,

D: tip diameter,

B: the facewidth

For after guarantee lining press-in bearing, endoporus is indeformable, ensure that again lining in use can not loosen, and chooses F1=1.2F, F2=1.6F

Lining 2 is pressed in bearing 1 by press machine 3 by second step, form bearing unit detailed process as follows: be placed on by bearing 1 on press machine (3) base, lining 2 is vertically placed on bearing 1 upper end, adjustment press machine 3 moves down, lining 2 is pressed in the endoporus of bearing 1, and measure lining 2 and to be pressed in bearing 1 process press machine 3 downwards to lining 2 applied pressure, require press machine 3 downwards to the pressure of lining 2 within the scope of the F1 ~ F2 of regulation.