CN207348997U - Twin shaft watt supports the single plunger high-pressure oil pump of transmission shaft kinematic pair - Google Patents

Abstract

A kind of single plunger high-pressure oil pump of twin shaft watt support transmission shaft kinematic pair disclosed in the utility model, it is desirable to provide meter is a kind of compact-sized, the single plunger high-pressure oil pump of service life length.The utility model is achieved by following technical proposals：Drive end bearing bracket is axially close to thrust plate, and oil pump drive spindle sequentially passes through the oil transfer pump that rolling element, postposition bearing shell and the cooperation that drive end bearing bracket, preposition bearing shell, thrust plate, unilateral cam engagement drive are connected；When oil pump drive spindle operates, pressure oil-bath lubrication passage that front and rear bearing shell lubricating oil is circumferentially formed with by drive end bearing bracket or pump box and front and rear bearing shell respectively, oil film is formed into the propeller shaft slip face gap of oil pump drive spindle.The taper roll bearing radial structure size that the utility model solves prior art use is larger, component part is more, of high cost, each pair of friction components hydrostatic hydraulic support oil film thickness of bearing clearance destructible is manufactured, plunger bushing is easily hot, easily the problem of supply capability decline occurs.

Description

Twin shaft watt supports the single plunger high-pressure oil pump of transmission shaft kinematic pair

Technical field

A kind of high-pressure oil pump for being mainly used for electric-controlled co-rail single plunger is the utility model is related to, specifically can be used for A kind of reliable, economic support device of electric-controlled co-rail single plunger high-pressure oil pump rotatable parts transmission shaft kinematic pair.

Background technology

Diesel injection system its mainly have inline plunger formula oil spout pumping system, distributor type fuel injection pump system, Unit injector system With electronic control common rail system etc..Plunger pump（Piston pump, plunger pump）It is important process portion in hydraulic pressure and pneumatic gearing Part.Plunger pump belongs to positive displacement pump, reciprocating pump.Plunger pump reciprocating, change sealing work in plunger cylinder by plunger Make chamber volume to realize oil suction or pressure oil, the pressure differential for causing the change of sealed volume in plunger cylinder and producing and fluid is situated between Matter works.Plunger pump is generally divided into single plunger pump, horizontal plunger pump.It is divided into by plunger arrangement mode difference:Axial plunger Pump and radial plunger pump.Single plunger pump structure composition mainly has eccentric wheel, plunger, spring, cylinder body, two check valves.Plunger with Sealed volume is formed between cylinder bore.Eccentric wheel rotation is gone around, and plunger pumps once, moves downward oil suction, upwards Move oil extraction.The fluid volume of pump every revolution discharge is known as discharge capacity, and discharge capacity is only related with the structural parameters of pump.Radial plunger pump It is divided into single, double and three row's three classes by plunger radial arrangement number of planes, seven plungers can at most be arranged by often arranging.Totally enclosed pump Shell both may be mounted inside fuel tank, is also mountable to outside fuel tank, is required according to user, and pump can be formed with one outlet, Several independent outlets can be formed with, the output flow and permissible working pressure of each oil outlet are by the column that is connected with each output oil port Fill in quantity and diameter determines.Axial plunger pump is the vibration-direction of the piston or plunger plunger parallel with cylinder center axis Pump.Axial plunger pump be moved back and forth in plunger hole using the plunger parallel with transmission shaft caused by volume change carry out Work, its pollution to hydraulic oil is more sensitive, and structure is more complicated, and cost is higher.The operation of oil pump time is longer, load it is larger or Empty pump for a long time, or fit clearance are too small, and insufficient lubrication, excessively high etc. reason of temperature can cause plunger stuck.Electric-controlled co-rail list The rotatable parts of plunger-type fuel pump are usually to make column by the timing gears of one group of passing power come what is driven by the bent axle of diesel engine Fuel feeding is operated plug according to certain rules；Meanwhile to be the offer driving torque of oil transfer pump 7 shown in Fig. 3 in oil pump.Bearing is single The important component of plunger high-pressure oil pump, if there is clearance in bearing, it cannot be guaranteed that the normal clearance of each pair of friction components in oil pump inside, The hydrostatic hydraulic support oil film thickness of each pair of friction components can be also destroyed at the same time, reduce the service life of oil pump bearing.According to oil pump manufactory The data of offer, the average life of bearing is 10000h, and new mouth is just needed replacing more than this value.The bearing disassembled, Be the clearance that can not detect bearing without specialty detecting instrument, range estimation can only be used, such as find roller surface have cut or Discoloration, must just replace.The oil pump drive spindle 1 of electric-controlled co-rail single plunger high-pressure oil pump is typically by a pair of of taper roll bearing 4 support.This bearing belongs to pedestal, its major part includes outer ring, inner ring, rolling element, retainer etc..Consider When electric-controlled co-rail oil pump works normally, 1 substantial radial load of oil pump drive spindle, it also requires a small amount of axial load is born, Therefore, which installs face-to-face using a pair of of unilateral thrust taper roll bearing 4.Due to thrust cone roller axis Rolling element in holding is taper roller, intersects at the axle center of bearing due to rolling the raceway busbar of busbar and packing ring in structure Certain point on line, thus rolling surface can form pure rolling, be often used for bearing very big axial load occasion.This mark The very little coaxial packing ring identical with bearing housing seat ring has the bearing of a tapered raceway and a positioning rib, and one, band passes through two A packing ring positioning, the retainer that to taper roll bearing is supported and carries concentric with roller.In structure design, circular cone rolling Sub- bearing can resolve into bearing assembly, i.e. inner ring, roller and retainer CONE and outer ring CUO.According to design requirement, circular cone rolling The Internal and external cycle raceway of sub- bearing and the extended line of roller centre line intersect at the one of bearing axis compared to the extended line of bearing axis Point, because of this feature, roller can be rotated along the center line of raceway face.It is main that common radial direction conical bearing bears axial force By inner ring rib, roller end face is rotated with rib face contact-gyro during movement, the axial force too big influence service life, and excessive Axial force can be broken rib.Plunger-type fuel pump generally requires the large torque slow-speed of revolution, gear connection.During work, in injection pump cam Under the action of cam and plunger spring on axis, plunger is forced to make upper and lower reciprocating motion, so as to complete pump oil task.When electronic When machine drives transmission shaft rotation, pumping cylinder is rotated together with plunger, and stopper head keeps contacting with swash plate forever, because swash plate and cylinder body into One angle, therefore during cylinder body rotation, plunger is just reciprocating in pumping cylinder.It goes to 180 ° from 0 °, that is, goes to uppermost plunger Position, plunger case volume gradually increases, therefore inlet port suction oil cylinder of the liquid through oil distribution casing；And inclined shaft pump is gone to from 180 ° At 360 °, plunger case volume is gradually reduced, therefore outlet discharge liquid of the liquid through oil distribution casing in oil cylinder.As long as rotation axis is continuous Rotation, pump just constantly work.Oil pump long time running fuel feeding efficiency declines, after oil pump runs a period of time under high rail pressure, Plunger bushing is easily hot, supply capability occurs declines failure.In electric-controlled co-rail oil pump drive spindle, bearing outer ring and oil pump front end Lid 2 or 3 pilot hole of pump box form tight fit, and bearing inner race and oil pump drive spindle 1 form tight fit, unilateral on oil pump drive spindle Cam is then arranged in the medium position of bearings, and unilateral cam promotes plunger to move back and forth by rolling element 6, load Another raceway is delivered to from a raceway along roller and raceway contact face, thus produces internal axial load.Passed in oil pump The side of moving axis, the drive key of arrangement low pressure oil transfer pump 7 drive the work of oil transfer pump.In taper roll bearing and oil pump transmission Bearing adjusting pad 5 is installed between the shaft shoulder of axis additional, the clearance tune of bearing can be carried out by adjusting the thickness of bearing adjusting pad It is whole.The advantages of this support device is to ensure oil pump drive spindle concentricity supported on both sides very well, can bear certain footpath To load and bi-directional axial load, and taper roll bearing belongs to standardization part, and interchangeability is good；Its shortcoming is composition Part is more, and taper roll bearing radial structure size is larger, is limited by the shape that electric-controlled co-rail single plunger oil pump assembles, and takes face Product is big, and manufacture cost is higher, and impact resistance is poor, and noise is larger during high speed, and the tolerance power to metallic foreign body is relatively low, bearing life Not as sliding bearing etc..

The content of the invention

The purpose of this utility model is part in view of the deficiency of the prior art, there is provided a kind of manufacture cost of meter Low, noise is small, compact-sized, service life length, can ensure the twin shaft watt support transmission of transmission parts stability and reliability The single plunger high-pressure oil pump of axis kinematic pair,

The utility model solves its technical problem the technical scheme adopted is that a kind of twin shaft watt supports transmission shaft kinematic pair Single plunger high-pressure oil pump, including：The bearing shell of 1 axle journal of oil pump drive spindle is assemblied in, is assemblied in 3 babinet input end stepped hole of pump box In drive end bearing bracket 2, it is characterised in that：Drive end bearing bracket 2 is axial to be close to thrust plate 9, and oil pump drive spindle 1 sequentially passes through drive end bearing bracket 2, preposition The oil transfer pump 7 that rolling element 6, postposition bearing shell and the cooperation that bearing shell 8, thrust plate 9, unilateral cam engagement drive are connected；Drive end bearing bracket 2 or 3 inside parts of pump box are equipped with lubrication channel, the pressure oil-bath lubrication passage that front and rear bearing shell 8 is circumferentially formed with, when oil pump drive spindle 1 During operating, lubricating oil enters the propeller shaft slip face gap of oil pump drive spindle 1 by above-mentioned lubrication channel, forms oil film.

The utility model has the advantages that compared with the prior art.

It is low to manufacture cost.The utility model is using the twin shaft watt support transmission shaft kinematic pair of manufacturing process maturation, and substitution is now It is taper roller to have the rolling element in technology tapered roller thrust bearing, is abandoned with the coaxial pad identical with bearing housing seat ring of size The bearing of the tapered raceway of circle and a positioning rib, is supported with the concentric bearing shell of oil pump drive spindle by two and positioned, to oil Pump drive shaft is supported and carries, and manufacture cost is low, and better economy, can meet existing electric-controlled co-rail single plunger oil pump Functional requirement, and can realize reliable working method and relatively low manufacture cost.Bearing shell stable working is reliable.And bearing shell works Caused noise is small, substantially noiseless, well below the noise of prior art taper roll bearing.

It is compact-sized, service life length.The utility model is used and set respectively in the support axle journal position of oil pump drive spindle 1 The transmission shaft kinematic pair that twin shaft watt, drive end bearing bracket 2, pump box 3 made of wear-resistant material are formed, with the tight fit of manufacturing process maturation Twin shaft watt is assembled to form transmission shaft kinematic pair, the arrangement space of bearing shell is more compact, and the structure that can simplify association parts is set Meter, number of parts is far fewer than taper roll bearing, the shape limitation that can effectively avoid electric-controlled co-rail single plunger oil pump from assembling, gram Take that taper roll bearing radial structure size is larger, and component part is more, manufactures the defects of of high cost.Pass through thrust plate and oil pump It is adjustable to be driven the axial gap of between centers, the film strength of thrust plate and oil pump transmission between centers has been effectively ensured.Led to using lubricating oil Cross drive end bearing bracket 2 or 3 inner wall duct of pump box and pressure oil-bath lubrication passage that front and rear bearing shell 8 is circumferentially formed with enters oil pump drive spindle 1 propeller shaft slip face gap forms oil film；Meanwhile transmission shaft can drive oil transfer pump to pressurize external fuel oil during exercise. The structure is high to the tolerance of foreign matter, and the pressure oil-bath lubrication passage of use is lubricated into oil pump drive spindle fit clearance, is slided Face can form oil film structure type when working so that correlated parts will not occur directly to contact, and greatly reduce friction loss And surface abrasion, extend the service life of whole device.Solve prior art bearing and clearance occur, it is impossible to ensure hydraulic pump The normal clearance of interior three pairs of pair of friction components, the hydrostatic hydraulic support oil film thickness of each pair of friction components of destructible, reduces plunger pump bearing and uses In the service life, plunger bushing is easily hot, easily the problem of supply capability decline occurs.

Brief description of the drawings

Fig. 1 is the dimensional structure diagram of the electric-controlled co-rail single plunger oil pump of the utility model.

Fig. 2 is office's sectional view of Fig. 1.

Fig. 3 is the sectional view of prior art single plunger oil pump.

In figure：1 oil pump drive spindle, 2 drive end bearing brackets, 3 pump boxs, 4 taper roll bearings, 5 bearing adjusting pads, 6 rolling elements, 7 is defeated Oil pump, 8 bearing shells, 9 thrust plates.

Embodiment

Refering to Fig. 1, Fig. 2.In embodiment described below, a kind of single plunger of twin shaft watt support transmission shaft kinematic pair is high Pressure oil pump, including：The bearing shell of 2 inner wall of oil pump drive end bearing bracket is assemblied in, the drive end bearing bracket being assemblied in 3 babinet input end stepped hole of pump box 2, wherein, preposition 8 interference of bearing shell in left side is fitted in 2 centre bore of drive end bearing bracket, and postposition bearing shell 8 interference in right side is fitted in pump box 3 In heart hole.Pass through matching somebody with somebody for the preposition bearing shell 8 that drive end bearing bracket 2 assembles and the postposition bearing shell 8 that is assembled by pump box 3 and oil pump drive spindle 1 Gap is closed to be controlled by the inner and outer diameter of bearing shell.During manufacture, after preposition bearing shell 8 is cooled down by liquid nitrogen, it is pressed into drive end bearing bracket 2 and assembles Hole, postposition bearing shell 8 are pressed into aperture in pump box 3 and move cooperation assembling after being cooled down by liquid nitrogen.Drive end bearing bracket 2 is axial to be close to thrust plate 9, Oil pump drive spindle 1 sequentially passes through rolling element 6, the postposition axis that drive end bearing bracket 2, preposition bearing shell 8, thrust plate 9, unilateral cam engagement drive Watt and coordinate connected oil transfer pump 7 etc.；When oil pump drive spindle 1 operates, lubricating oil passes through drive end bearing bracket 2 or pump box 3 and front and rear What bearing shell 8 was circumferentially formed with forces oil-bath lubrication passage to form oil film into the propeller shaft slip face gap of oil pump drive spindle 1, together When, transmission shaft can drive oil transfer pump to pressurize external fuel oil during exercise.

The oil leab of corresponding 8 Circumferential oil groove lubrication channel of front and rear bearing shell is formed with inside drive end bearing bracket 2 and pump box 3.

9 surface of thrust plate is machined with oil groove, is assemblied in 2 centre bore side wall of drive end bearing bracket, machine oil is along rotatable parts 1 and bearing shell Gap between 8 is flowed between 1 thrust surface of thrust plate 9 and rotatable parts, forms oil film.

During to avoid the gap between thrust plate 9 and thrust surface excessive, axial movement value can increase；Thrust plate 9 and thrust When gap between face is too small, thrust plate 9 easily forms the possibility of dry friction, thrust plate 9 and drive end bearing bracket 2 with oil pump drive spindle 1 Gap between thrust surface need to be by regulation spacing adjustment, during manufacture, and the gap between thrust plate 9 and oil pump drive spindle 1 passes through choosing The thrust plate 9 of different-thickness is selected to control.

Unilateral cam on oil pump drive spindle 1 at work by promote the rolling element 6 on oil pump drive spindle 1 come Fuel feed pump plunger is driven, according to certain rules fuel feeding.Drive key is provided with the right side shaft end of oil pump drive spindle 1 to drive oil transportation The rotation of 7 rotors is pumped, drives vane pump operating conveying low-voltage fuel to fuel feed pump plunger chamber.

Claims (4)

1. a kind of single plunger high-pressure oil pump of twin shaft watt support transmission shaft kinematic pair, including：It is assemblied in oil pump drive spindle（1）Axle journal Bearing shell, be assemblied in pump box（3）Drive end bearing bracket in babinet input end stepped hole（2）, it is characterised in that：Drive end bearing bracket（2）It is axial tight Paste thrust plate（9）, thrust plate（9）Hole wall surface is formed with radial direction oil-way, thrust plate（9）It is assemblied in drive end bearing bracket（2）Centre bore Side wall, lubricating oil is along oil pump drive spindle（1）And bearing shell（8）Between gap flow to thrust plate（9）With oil pump drive spindle（1）Only Between pushing surface, oil film, oil pump drive spindle are formed（1）Sequentially pass through drive end bearing bracket（2）, preposition bearing shell（8）, thrust plate（9）, it is unilateral convex Wheel coordinates the rolling element driven（6）, postposition bearing shell and coordinate connected oil transfer pump（7）；Drive end bearing bracket（2）Or pump box（3）In part Portion is equipped with lubrication channel, front and rear bearing shell（8）The pressure oil-bath lubrication passage being circumferentially formed with, works as oil pump drive spindle（1）During operating, Lubricating oil enters oil pump drive spindle by above-mentioned lubrication channel（1）Propeller shaft slip face gap, formed oil film, oil pump drive spindle （1）Right side shaft end be provided with driving oil transfer pump（7）The drive key that rotor rotates, oil pump drive spindle（1）On unilateral cam exist During work, oil pump drive spindle is installed on by promoting（1）On rolling element（6）To drive fuel feed pump plunger, fuel feeding according to certain rules Vane pump operating conveying low-voltage fuel is driven to fuel feed pump plunger chamber.

2. the single plunger high-pressure oil pump of twin shaft watt support transmission shaft kinematic pair as claimed in claim 1, it is characterised in that：Oil pump Transmission shaft（1）Fit clearance controlled by the inner and outer diameter of front and rear bearing shell.

3. the single plunger high-pressure oil pump of twin shaft watt support transmission shaft kinematic pair as claimed in claim 1, it is characterised in that：It is preposition Bearing shell（8）It is pressed into drive end bearing bracket（2）Pilot hole, postposition bearing shell（8）It is pressed into pump box（3）Corresponding pilot hole.

4. the single plunger high-pressure oil pump of twin shaft watt support transmission shaft kinematic pair as claimed in claim 1, it is characterised in that：Thrust Piece（9）With oil pump drive spindle（1）Between gap by selecting the thrust plate of different-thickness（9）To control.