CN1746482A - Common rail - Google Patents

Common rail Download PDF

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Publication number
CN1746482A
CN1746482A CNA200510099221XA CN200510099221A CN1746482A CN 1746482 A CN1746482 A CN 1746482A CN A200510099221X A CNA200510099221X A CN A200510099221XA CN 200510099221 A CN200510099221 A CN 200510099221A CN 1746482 A CN1746482 A CN 1746482A
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CN
China
Prior art keywords
rail
connector
strut
cavity
fuel
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Granted
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CNA200510099221XA
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Chinese (zh)
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CN100460662C (en
Inventor
山本晃嘉
近江义典
近藤淳
上甲敬三
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Denso Corp
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Denso Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Abstract

A ring-shaped connecting portion is formed on a seat surface side of a pipe connector. The connecting portion is tapered so that thickness thereof gradually reduces toward a tip end thereof. A protrusion is formed on the tip end of the connecting portion. A ring-shaped groove is formed on a flat outer peripheral surface of a common rail. By fitting the protrusion into the groove, the connector can be positioned to a predetermined position of the common rail. In this structure, current can be concentrated to the protrusion and current density can be increased. As a result, sufficient bonding strength can be attained.

Description

Be total to rail
Technical field
The present invention relates to be used for to be used for the connector element of pressure accumulation fuel injection system or strut is installed being attached to lip-deep associated methods of metal base material and combination configuration by welding.The invention still further relates to and inject the common rail of installing on the common rail fuel injection system of fuel in internal-combustion engine, described rail altogether is used to accumulate fuel under high pressure.Especially, the present invention relates to a kind of combination that forms by a plurality of parts of welding rail altogether.
Background technique
When tube connector is attached on the common rail of pressure accumulation fuel injection system of internal-combustion engine, need bound fraction to have certain intensity and Location accuracy.
International publication number NO.01/66934 (WO ' 934) discloses the protruding localization part on a kind of external peripheral surface of altogether rail.Connector is coupled on the localization part, thereby guarantees Location accuracy.Therefore, WO ' 934 carries out welding process to guarantee adhesive strength.
In the resistance welding process, electric current is by the altogether point of contact conduction of rail, and rail and the connector heat that uses the resistance by the point of contact place to generate at the point of contact place welds altogether.Therefore, be not the localization part of point of contact if electric current is flowed through, the density of the electric current of the point of contact of flowing through will reduce, and adhesive strength will be not enough.Therefore, WO ' 934 discloses inserting dead ring between localization part and the connector and prevented the electric current localization part of flowing through in the resistance welding process.
Yet, can not provide any improved dead ring to the performance of product because the technology described in the WO ' 934 has been used, so can unnecessarily increase cost.
In the pressure accumulation fuel injection system, rail is installed on the internal-combustion engine by strut is installed altogether.Therefore, the installation strut is very important with respect to the Location accuracy that is total to rail.Depart from if the binding site of strut is installed when the installation strut is attached on the common rail, it will have influence on connector with respect to the Location accuracy that is total to rail.Usually, strut being installed guarantees by carrying out the anchor clamps adjustment with respect to the Location accuracy that is total to rail.
Guarantee to install the size error that strut can not receive common rail or strut is installed with respect to the method for the Location accuracy that is total to rail by the anchor clamps adjustment.Therefore, if error for example, in the external diameter of length that is total to rail or installation strut, is installed strut so and will be worsened with respect to the Location accuracy that is total to rail.And, if when carrying out the resistance welding process, cause common rail thermal expansion, being subjected to the influence of thermal expansion owing to heat generates, the Location accuracy that strut is installed will worsen.
Forge rail altogether and be by conducting forging processing and form the rail body of accumulating fuel under high pressure with single part and be used to manage the joint that is connected and make.
A kind of combination rail has altogether been described in JP-A-2005-9672.Make respectively and be bonded to each other in conjunction with a plurality of parts of rail altogether by welding process.Be total to rail with forging and compare, can boost productivity and reduce cost in conjunction with being total to rail.Common rail (for example, shown in Figure 33 A to 34C) of maqting type and sleeve type rail (for example, shown in Figure 35 A to 35C) altogether are in conjunction with the example that is total to rail.
Shown in Figure 33 A, make maqting type at first respectively and be total to rail body 70, the cylinder shape connector 72 of rail and be used to manage the joint 23 that is connected.On the upper surface of the rail body 70 in Figure 33 A, formed in a longitudinal direction on 74, the first planes 74, first plane and combined connector 72.Then, rail body 70 and connector 72 are by the combination of resistance welding process, and joint 23 is fastened on the connector 72.Therefore, maqting type is total to rail and manufactures the appearance shown in Figure 33 B.Shown in Figure 33 C, by tightening nut 35 is threaded onto on the joint 23, the tapering part 33 on the top of each pipe 56,57 just is connected on the joint 23.Joint 23 is made by the iron group metal material.Joint passage 28 is formed at the axial centre of joint 23.Joint passage 28 is connected each the inner passage of inside and outside intercommunicating pore 76 with pipe 56,57.
Main body side outside thread 29 is formed on the end of joint 23.Main body side outside thread 29 is threaded in the connector screw thread 77.Pipe side outside thread 30 is formed on the other end of joint 23.Pipe side outside thread 30 is used for connecting tube 56,57.
Second plane 31 is formed on the end face of joint 23, has formed main body side outside thread 29 on it.Second plane 31 overlaps with first plane 74 of rail body 70.More specifically, second plane 31 is formed on the end face of main body side outside thread 29 around joint passage 28.
Main body side outside thread 29 is threaded in the connector screw thread 77, and the top of main body side outside thread 29 is shifted onto in the connector 72 dearly.Therefore, be communicated with inside and outside intercommunicating pore 76 at the joint passage 28 of second plane, 31 split sheds at first plane, 74 split sheds, and second plane 31 around joint passage 28 is pressed on first plane 74 of inside and outside intercommunicating pore 76, thereby forms body seal surface (oily close surface) 32.
Conical pressure receives on the side that wherein forms pipe side outside thread 30 on the end face that seat surface 34 is formed on joint 23.The tapering part 33 that forms is inserted into pressure and receives in the seat surface 34 on the top on each of pipe 56,57.Joint passage 28 is uncovered in the bottom that pressure receives seat surface 34.
Nut thread (internal thread) 36 is formed on the inner circumferential surface of pipe tightening nut 35, and pipe tightening nut 35 is assembled on each of pipe 56,57.Pipe side outside thread 30 is threaded with nut thread 36.Pipe tightening nut 35 is threaded in following state with the pipe side outside thread 30 of joint 23: wherein manage tightening nut 35 and impinge upon and manage the step that forms on 56,57 each the rear side of tapering part 33.Be threaded onto on the pipe side outside thread 30 by managing tightening nut 35, the tapering part 33 of each of pipe 56,57 just is pressed in pressure and receives on the seat surface 34, thereby forms seal of tube surface (oily close surface) 37.
Shown in Figure 34 A, make maqting type at first respectively and be total to rail body 70, the cylinder shape connector 82 of rail and be used to manage the joint 23 that is connected.On the upper surface of the rail body 70 in Figure 34 A, formed in a longitudinal direction on 74, the first planes 74, first plane and combined connector 82.Then, rail body 70 and connector 82 are by the laser beam welding combination, and joint 23 is fastened on the connector 82.Therefore, maqting type is total to rail and just manufactures the appearance shown in Figure 34 B.
Main body side outside thread 29 is threaded in the connector screw thread 87 of connector 82, and the top of main body side outside thread 29 is shifted onto in the connector 82 dearly.Therefore, be communicated with inside and outside intercommunicating pore 76 at the joint passage 28 of second plane, 31 split sheds at first plane, 74 split sheds, and second plane 31 around joint passage 28 is pressed on first plane 74 of inside and outside intercommunicating pore 76, thereby forms body seal surface (oily close surface) 32.
The sleeve type rail body 80 and the cylinder shape connector 92 of rail is altogether made respectively, as shown in Figure 35 A.Then, rail body 80 and connector 92 are by resistance welding process (or laser bonding processing) combination.Therefore, shown in Figure 35 B, altogether rail is manufactured comes out for sleeve type.The tapering part 133 on the top of each of pipe 66,67 and the part of sleeve 143 are inserted in the connector 92, and pipe tightening nut 135 is threaded onto on the connector 92.Therefore, the tapering part 133 on the top of each of pipe 66,67 is directly connected on the pressure reception seat surface 134 of rail body 80.In Figure 35 A, first plane 84 is formed on the upper surface of rail body 80.Inside and outside intercommunicating pore 86 is uncovered in the bottom that pressure receives seat surface 134.Nut thread 136 is formed on the inner circumferential surface of pipe tightening nut 135.Connector 92 is formed with connector screw thread 127.Tapering part 133 and pressure receive seat surface 134 and form body seal surface (oily close surface) 137.
Because forging rail is altogether made with single part by forging process, so can improve the accuracy to shape of each part.Because in conjunction with being total to rail is by making each part (for example, rail body 70,80 and connector 72,82,92) respectively and passing through soldering part and make, so be difficult to reach and forge the identical accuracy to shape of rail altogether.
Especially, be attached to the influence that part on the plane is subjected to welding fixture.Therefore, be difficult to produce and have altogether rail of high-precision combination.
Summary of the invention
An object of the present invention is to provide connector element in conjunction with configuration and associated methods, described connector element can be guaranteed adhesive strength and Location accuracy and not use improved part can not be provided the performance of product.Another object of the present invention provides the associated methods that strut is installed, and it can guarantee to install strut can not be subjected to the size error of product or the influence of the thermal expansion of rail altogether with respect to the Location accuracy that is total to rail.Another object of the present invention be improve rail altogether in conjunction with precision, altogether rail by weld first member for example rail body and second member for example connector make.
According to one aspect of the present invention, connector element is attached to by the resistance welding process on the metal base material of using in the pressure accumulation fuel injection system, and described pressure accumulation fuel injection system will be total to the fuel under high pressure of accumulating in the rail through sparger and inject internal-combustion engine.Connector element is formed with the ring-type joint, and its thickness reduces gradually towards its top.Connector element also is formed with projection on its top.Metal base material is formed with the annular groove complementary with projection in its surface.The resistance welding process goes up execution by electric current being gathered projection, makes connector element place the precalculated position with respect to metal base material by projection and groove are fitted to each other when carrying out the resistance welding process.
Therefore, can be coupled to the groove that forms on the surface of metal base material by the projection that forms on the joint with connector element, thereby make connector element place the precalculated position with respect to metal base material.As the groove of localization part with convex to form on two parts, for example be formed on the metal base material and connector element by the combination of resistance welding process.Therefore, can improve the Location accuracy of connector element.
The thickness of joint reduces gradually towards its top, and convexes to form on the top.Therefore, the resistance welding process can go up realization by electric current being gathered projection, and can reach enough adhesive strengths.In addition, do not need to be used to prevent the flow through dead ring of except that weld part part of electric current.
According to another aspect of the present invention, has localization part by first member and second member are welded to one another the common rail that forms together a position, first member and second member contact with each other in this position when carrying out welding, and wherein first member and second member are fitted to each other at localization part.
By when cooperating localization part, carrying out welding process, can improve between first and second parts in conjunction with precision.
Description of drawings
Be appreciated that embodiment's the feature and advantage and the operating method and the function of correlated parts by research following detailed description, appended claims and accompanying drawing, and detailed description, appended claims and accompanying drawing are all formed the part of this application.In the accompanying drawings:
Fig. 1 is the schematic representation that shows according to the present invention first example embodiment's fuel injection system;
Fig. 2 is the sectional view that shows according to the linkage structure of common rail embodiment illustrated in fig. 1 and connector;
Fig. 3 is the amplification view of demonstration according to the embodiment's of Fig. 1 linkage structure;
Fig. 4-the 17th shows the amplification view of the linkage structure of improvement example embodiment illustrated in fig. 1;
Figure 18 shows according to example embodiment's of the present invention common rail and the sectional view of linkage structure between the strut is installed;
Figure 19 is the enlarged view that shows according to the part of linkage structure embodiment illustrated in fig. 18;
Figure 20 is the enlarged view that shows according to the improvement part of linkage structure embodiment illustrated in fig. 18;
Figure 21 A shows according to another example embodiment's of the present invention common rail and the side view of linkage structure between the strut is installed;
Figure 21 B is the axial front elevation that shows according to the linkage structure of Figure 21 A illustrated embodiment;
Figure 22 is the amplification view of demonstration according to the part of the linkage structure of Figure 21 A illustrated embodiment;
Figure 23 is the amplification view of demonstration according to the part of the linkage structure of Figure 21 A illustrated embodiment;
Figure 24 A shows according to another one example embodiment's of the present invention common rail and the axial front elevation of linkage structure between the strut is installed;
Figure 24 B is the sectional view that shows according to Figure 24 A illustrated embodiment;
Figure 25 is the schematic representation that shows according to example embodiment's of the present invention common rail fuel injection system;
Figure 26 is the side view that shows according to common rail embodiment illustrated in fig. 25;
Figure 27 A is the view that shows according to the installation method of tube connector embodiment illustrated in fig. 25;
Figure 27 B is the planimetric map that shows according to the cavity on first plane of common rail embodiment illustrated in fig. 25;
Figure 27 C shows according to the common rail embodiment illustrated in fig. 25 and the sectional view of tube connector;
Figure 27 D is the planimetric map that shows according to weld part embodiment illustrated in fig. 25;
Figure 28 A is the view of demonstration according to the installation method of another example embodiment's of the present invention tube connector;
Figure 28 B is the planimetric map that shows the cavity on first plane that is total to rail;
Figure 28 C shows the sectional view that is total to rail and tube connector;
Figure 28 D is the planimetric map that shows weld part;
Figure 29 A is the view of demonstration according to the installation method of another example embodiment's of the present invention tube connector;
Figure 29 B is the planimetric map that shows the cavity on first plane that is total to rail;
Figure 29 C shows the sectional view that is total to rail and tube connector;
Figure 29 D is the planimetric map that shows weld part;
Figure 30 A is the view of demonstration according to the installation method of another one example embodiment's of the present invention tube connector;
Figure 30 B is the planimetric map that shows the cavity on first plane that is total to rail;
Figure 30 C shows the sectional view that is total to rail and tube connector;
Figure 30 D is the planimetric map that shows weld part;
Figure 31 A is the view of demonstration according to the installation method of another example embodiment's of the present invention tube connector;
Figure 31 B is the planimetric map that shows the cavity on first plane that is total to rail;
Figure 31 C shows the sectional view that is total to rail and tube connector;
Figure 31 D is the planimetric map that shows weld part;
Figure 32 A is the view of demonstration according to the installation method of another example embodiment's of the present invention tube connector;
Figure 32 B is the planimetric map that shows the cavity on first plane that is total to rail;
Figure 32 C shows the sectional view that is total to rail and tube connector;
Figure 32 D is the planimetric map that shows weld part;
Figure 33 A-33C is the view that shows the installation method of tube connector in the correlation technique;
Figure 34 A-34C is the view that shows the installation method of tube connector in the another kind of correlation technique; And
Figure 35 A-35C is the view that shows the installation method of tube connector in another correlation technique.
Embodiment
Referring to Fig. 1, shown pressure accumulation fuel injection system among the figure according to the first example embodiment of the present invention.
For example, the pressure accumulation fuel injection system according to first embodiment is applied on the four-cylinder diesel engine.As shown in Figure 1, fuel injection system has the common rail 1 of accumulating fuel, injects at least one (being four in the present embodiment) sparger 4 or the like of the cylinder 3 of diesel engine to the fuel feed pump 2 of rail 1 pressure feed fuel altogether, with fuel.Electronic control component (ECU) 5 control fuel injection systems.
Rail 1 will be accumulated to jet pressure (target guide rail pressure) by fuel feed pump 2 supplied fuel altogether.ECU 5 calculates target guide rail pressure according to the serviceability (for example, accelerator position and engine speed) of motor.Rail 1 is formed with tube connector 6 altogether, and its number is identical with the number (being four in the present embodiment) of engine cylinder.Connector 6 is connected with the high-voltage tube 7 of supply fuel under high pressure, and the fuel under high pressure that high-voltage tube 7 is used for common rail 1 is accumulated is to sparger 4 supplies.
Fuel feed pump 2 comprises the feed pump (not shown) of suction of fuel from fuel tank 8.The fuel that fuel feed pump 2 will pump out from feed pump be compressed to predetermined pressure and with fuel to rail 1 pressure feed altogether.
Each sparger 4 all is installed on each cylinder of motor and by high-voltage tube 7 and is connected on the common rail 1.Sparger 4 comprises can be by ECU 5 electronically controlled solenoid valve (not shown)s.Injection timing and emitted dose are by the excitation timing and the Energizing cycle control of solenoid valve.
ECU 5 receives by the detected sensor information of different sensor (for example, pressure transducer 9, engine rotation speed sensor 10 and accelerator position sensor 11).The emitted dose of ECU 5 control spargers 4 and the fuel discharge capacity of fuel feed pump 2.
Pressure transducer 9 is installed on the end of common rail 1.Pressure transducer 9 detects fuel pressure (the actual guide rail pressure) P that accumulates in being total to rail 1, and to ECU 5 output testing results.
In a rotary course of engine crankshaft, a plurality of pulse signals of engine rotation speed sensor 10 outputs.ECU 5 comes detection of engine rotational speed N E by the interval between the pulse signal of measuring engine rotation speed sensor 10 outputs.
Accelerator position sensor 11 detects accelerator position based on the operation amount (depressing quantity) of the accelerator pedal of being operated by the vehicle driver 12.Accelerator position sensor 11 is exported testing result to ECU 5.
Connector 6 is attached on the predetermined part of common rail 1 by the resistance welding process.As shown in Figure 2, connector 6 forms the shape of the annular body with hole 6a.Among the end patchhole 6a of high-voltage tube 7 and by (not shown) combinations such as nuts.
Connector 6 is formed with ring-type joint 6b on seat surface side (side relative with high-voltage tube 7 inserting sides).Joint 6b is taper, and its thickness just reduces gradually towards its top like this.Joint 6b is formed with protruding 6c on its top.In example embodiment, the section of protruding 6c forms rectangular shape, as shown in Figure 2, but also can set other convex shape as follows.Projection 6c forms along the shape of the ring of the circumference of joint 6b.In example embodiment, protruding 6c is continuous and defines around the whole circumference of joint 6b.Yet, be appreciated that discontinuous projection also can be a kind of option.
Rail 1 forms porose 1a in a longitudinal direction in its axial centre altogether, and its section for example is circular.The two ends of circular hole 1a are all stopped up hermetically, thus the pressure accumulating chamber that is formed for accumulating fuel under high pressure.A part of circumference of the external peripheral surface of rail 1 flattens in a longitudinal direction altogether.Be formed with annular groove 1b in the part that flattens, in this example embodiment, annular groove 1b has rectangular section.The degree of depth of the groove 1b height with protruding 6c substantially is identical, and the width of groove 1b (horizontal dimension among Fig. 3) is slightly greater than the width of protruding 6c, as shown in Figure 3.
By protruding 6c being put into the annular groove 1b that forms on the common rail 1, two surfaces (interior and external peripheral surface) of protruding 6c all are subjected to the restriction of the both sides of groove 1b by meeting.Therefore, connector 6 just is placed.When the connector 6 that places applies extruding force, carrying out the resistance welding process, thereby connector 6 is being attached on the common rail 1.
In this associated methods, because localization part (groove 1b and protruding 6c) is formed on common rail 1 and the connector 6, so can reach very high Location accuracy.Because reduce gradually towards the top and protruding 6c is formed on the top of joint 6b at the thickness of the joint 6b that forms on the connector 6, thus electric current can converge on the protruding 6c, thereby increase the density of electric current.Therefore, can reach enough adhesive strengths.In addition, because electric current converges on the protruding 6c, so do not need dead ring.
Do not need to guarantee that by carrying out the anchor clamps adjustment connector 6 is with respect to the Location accuracy that is total to rail 1 according to the present embodiment associated methods.Therefore, even in carrying out the resistance welding process, make common rail 1 thermal expansion, can guarantee that also connector 6 can not be subjected to the influence of thermal expansion with respect to the Location accuracy that is total to rail 1 owing to heat generates.More specifically, even thermal expansion has taken place rail altogether, connector 6 also can be placed to the precalculated position.Therefore, the thermal expansion that can prevent common rail 1 is to the deterioration of the Location accuracy of the influence of the Location accuracy of connector 6 and connector 6.
In the first example embodiment, in the both sides of the protruding 6c that forms on the connector 6 by the both sides restriction of the groove 1b that forms on the rail 1 altogether with locate (width of groove 1b is slightly greater than the width of protruding 6c).Perhaps, the external peripheral surface of protruding 6c can be by the external peripheral surface of groove 1b ' location, and as shown in Figure 4, perhaps the inner circumferential surface of protruding 6c can be by groove 1b " the inner circumferential surface location, as shown in Figure 5.
In the first example embodiment, the joint 6b of connector 6 is taper, and the protruding 6c with rectangular section is provided on the top of joint 6b.The shape of projection 6c can arbitrarily change, shown in the example among Fig. 6 to 17.The shape of the section of groove 1b, 1c, 1d also can change according to the shape of protruding 6c.
In first embodiment, the present invention is applied to and is used for high-voltage tube 7 is connected to connector 6 on the common rail 1.For example, the present invention also can be applied to and be used for fuel pipe 13 is connected to tube connector on the common rail 1, wherein fuel pipe 13 is used for to being total to the fuel under high pressure that rail 1 supply is supplied with under pressure by fuel feed pump 2, can be applied to and be used for pressure transducer 9, reduction valve 14 or pressure regulator (not shown) are connected in the connector on the common rail 1, can be applied to carriage is fixed in the fixed connector on the common rail 1, can be applied to and be used for fuel pipe 13 is connected to tube connector on the cylinder head of fuel feed pump 2, or be applied to and be used for high-voltage tube 7 is connected to tube connector on the main body of sparger 4.
Shown common rail 1 among Figure 18 according to example embodiment of the present invention.Two strut 215 being installed is attached on as shown in figure 18 the common rail 201 by resistance welding technology.Rail 201 uses the bolt (not shown) to be installed on the diesel engine by strut 215 is installed altogether.
Strut 215 formation are installed have the cylinder form of circular hole 215a, and bolt inserts among the circular hole 215a.The center of the excircle of the center of the inner circumference of circular hole 215a and installation strut 215 overlaps each other.More specifically, the excircle circle of the inner circumference circle (circumference of circular hole 215a) of installation strut 215 and installation strut 215 sets and is concentric circle.Strut 215 is installed is attached on the common rail 201, the direction of the axial centre of circular hole 215a is just perpendicular to the longitudinal direction that is total to rail 201 like this.
Rail 201 is formed with and is used for two localization cavity 201c of strut 215 location are installed altogether.Localization cavity 201c forms the rectangular shape that has predetermined width along the longitudinal direction that is total to rail 201.The width of localization cavity 201c is arranged to less than the external diameter that strut 215 is installed.When the degree of depth of localization cavity 201c is arranged on two edges that strut 215 is placed on localization cavity 201c are installed, the bottom that the external peripheral surface of strut 215 can not collide localization cavity 201c is installed.The edge of localization cavity 215 can carry out chamfering, thereby forms chamfered part 201d, as shown in figure 19, and perhaps can preserving edge, as shown in figure 20.
In structure according to this example embodiment, be placed on by the external peripheral surface that strut 215 will be installed on two edges of localization cavity 201c, install strut 215 the center can with the center-aligned of localization cavity 201c.More specifically, strut 215 being installed can be placed on the precalculated position with respect to being total to rail 201 by self-alignment.Therefore, even occur in the wrong situation, strut 215 is installed also can is placed in the preposition and can be subjected to wrong influence with respect to rail 201 altogether in the length of rail 201 altogether or external diameter that strut 215 is installed.Therefore, can improve Location accuracy.
Figure according to this example embodiment also need not guarantee to install strut 215 with respect to the Location accuracy that is total to rail 201 by carrying out the anchor clamps adjustment.Therefore, even when carrying out the resistance welding process, cause common rail 201 thermal expansions, also can carry out the location and absorb thermal expansion owing to heat generates.More specifically, though altogether rail 201 since thermal expansion and elongated, the center that strut 215 is installed also can remain on the center of localization cavity 201c.Therefore, the binding site of installation strut 215 can be owing to the thermal expansion that is total to rail 201 departs from.Therefore, can guarantee to install strut 215 with respect to the Location accuracy that is total to rail 201.
Shown common rail 301 among Figure 21 A and the 21B according to example embodiment of the present invention.
Common rail 301 shown in Figure 21 A and 21B uses cube shaped installation strut 315.Profile according to this example embodiment's installation strut 315 forms cubical shape, shown in Figure 21 A and 21B.Localization cavity 315b is formed on the surface of the cubic shape that strut 315 is installed.Strut 315 is installed is formed with through hole 315a, and localization cavity 315b formation has the rectangular shape of predetermined width along the direction of the axial centre of through hole 315a.The edge that strut 315 is installed can carry out chamfering, thereby forms chamfered part 315c as shown in figure 22, perhaps can keep the edge that strut 315 is installed, as shown in figure 23.
Rail 301 is formed with positioning groove 301e altogether, and positioning groove 301e is used for respect to the longitudinal direction location and installation strut 315 that is total to rail 301, shown in Figure 21 A.Positioning groove 301e has just put into positioning groove 301e along the width that the length of the longitudinal direction of rail 301 altogether is arranged to install strut 315.Positioning groove 301e is along whole circumference along the circumference formation of rail 301 altogether in the example shown.
Strut 315 is installed can be put into positioning groove 301e and realize with respect to the location of the longitudinal direction of rail 301 altogether by strut 315 will be installed.The center of localization cavity 315b by two edges with localization cavity 315b be put into (contact) altogether the external peripheral surface (positioning groove 301e) of rail 301 go up and the center-aligned of rail 301 together.More specifically, strut 315 is installed with respect to guaranteeing by self-alignment perpendicular to the Location accuracy of radially direction (in Figure 21 B for laterally).
Shown common rail 401 among Figure 24 A and the 24B according to example embodiment of the present invention.
According to this example embodiment the two ends that strut 415 is formed on cylinder form are installed and have the shape of the cylinder of flange portion 415d.The external diameter of flange portion 415d is slightly greater than the external diameter of cylindrical part.Strut 415 is installed is formed with through hole 415a.
Rail 401 is formed with localization part 401f altogether, and localization part 401f has the length that can just put into two flange portion 415d that strut 415 is installed.Localization part 401f forms by the external peripheral surface that is total to rail 401 is progressively chopped back.Localization part 401f also serves as the localization cavity 401c that is used for respect to the longitudinal direction location and installation strut 415 that is total to rail 401.
In the structure according to this example embodiment, the external peripheral surface that the cylindrical part that strut 415 can be by will installing strut 415 with respect to the location of the longitudinal direction of rail 401 altogether is installed is put on two edges of localization cavity 401c and realizes.Installation strut 415 can limit by localization part 401f being put between two flange portion 415d that strut 415 is installed along the motion of the central shaft that strut 415 is installed (being laterally in Figure 24 A).
Even when carrying out the resistance welding process, cause common rail 401 that thermal expansion takes place owing to heat generates, with the same among second embodiment, in third and fourth embodiment, also can guarantee to install strut 415 can not be subjected to thermal expansion with respect to the Location accuracy that is total to rail 401 influence.
Shown common rail type fuel injection system among Figure 25 according to example embodiment of the present invention.Fuel injection system is as shown in figure 25 carried out fuel to each cylinder of motor (for example, diesel engine does not show) and is sprayed.Fuel injection system comprises common rail 51, sparger 52, supply pump 53, control unit of engine (ECU) 54, engine-driving unit (EDU) 55 etc.EDU 55 can be integrated among the ECU 54.
Rail 51 is the accumulation vessel that are used to accumulate fuel under high pressure altogether, and fuel under high pressure is supplied to sparger 52.In order to accumulate common rail pressure in the rail 51 altogether according to fueling injection pressure, rail 51 links to each other with the exhaust port of supply pump 53 by high pressure pump line 56 altogether, and supply pump 53 pressure feed fuel under high pressure.Rail 51 links to each other with a plurality of gun hoses 57 to come to sparger 52 supply fuel under high pressure altogether.
Voltage limiter 60 as pressure relief valve is connected on the relief pipe 59, and relief pipe 59 turns back to fuel the fuel tank 58 from being total to rail 51.The setting pressure if the fueling injection pressure in the common rail 51 oversteps the extreme limit, voltage limiter 60 will be opened, thus the pressure limit that will be total in the rail 51 is a limit setting pressure or lower.
Reduction valve 61 is connected on the common rail 51.The valve that reduction valve 61 responses are provided by ECU 54 is opened control signal and is opened.Therefore, reduction valve 61 promptly reduces common rail pressure by relief pipe 59.By reduction valve 61 being installed on the common rail 51, ECU 54 can promptly control common rail pressure and drop to and the corresponding pressure of the runnability of vehicle.Perhaps, reduction valve 61 can not be installed on the common rail 51, as shown in figure 26.
Sparger 52 is installed on each cylinder of motor, thereby injects fuel in cylinder.Sparger 52 comprises fuel nozzle, solenoid valve etc.Fuel nozzle is connected to from the downstream of each gun hose 57 that is total to rail 51 branches and will be total to the fuel under high pressure of accumulating the rail 51 and injects each cylinder.The lifting operation of the nozzle needle that holds in the electromagnetic valve fuel nozzle.
The fuel that leaks from sparger 52 turns back in the fuel tank 58 through relief pipe 59.
Supply pump 53 is the high pressure fuel pumps that are used for to being total to rail 51 pressure feed fuel under high pressure.Supply pump 53 has feed pump, and feed pump pumps out fuel from fuel tank 58, delivers to supply pump 53 through filter 62.Supply pump 53 is forced into high pressure with the fuel that pumps out and to rail 51 pressure feed pressurized fuels altogether.Feed pump and supply pump 53 are driven by common camshaft 63, and camshaft 63 is by engine revolution.
Suction control valve (SCV) 64 is installed on the fuel channel of supply pump 53, and fuel channel imports fuel fuel is forced in the pressurized chamber of high pressure.The opening degree of SCV 64 fuel metering passages.The control of the pump drive signal that provided by ECU 54 is provided SCV 64, thereby regulates the aspiration that is drawn into the fuel in the pressurized chamber.Therefore, SCV 64 can change the discharge capacity to the fuel that is total to rail 51 pressure feeds.Common rail pressure can be regulated by the amount that adjusting enters the fuel in the common rail 51.More specifically, ECU 54 control SCV 64, thereby with pressure control of common rail system be and the corresponding pressure of the running state of vehicle.
ECU 54 comprises CPU and storage device (storage, for example ROM, RAM, SRAM or EEPROM).ECU 54 carries out dissimilar computings based on program stored among the ROM and the sensor signal (serviceability of vehicle) that is input among the RAM etc.
At every turn when carrying out the fuel injection, ECU 54 can determine the opening and closing timing of each target emitted dose of spraying, spray regime, sparger 52 and the opening degree (exciting current value) of SCV 64 based on program stored among the ROM and the sensor signal of importing among the RAM.
EDU 55 has the sparger drive circuit.
The sparger drive circuit provides valve to open driving current based on the sparger opening signal that ECU 54 provides to the solenoid valve of sparger 52.By providing valve to open driving current to solenoid valve, fuel under high pressure is injected cylinder.Open driving current by stop valve, can stop fuel and spray.Be used for providing the SCV drive circuit of driving current can be contained in the shell of ECU 54 to the solenoid valve of SCV 64.Perhaps, the SCV drive circuit can be contained in the shell of EDU 55.
ECU 54 is connected with the sensor that is used to detect the vehicle serviceability, these sensors for example for the pressure transducer 65 that is used to detect common rail pressure, be used to detect the accelerator sensor of accelerator position, the cooling-water temperature sensor that is used for the speed probe of detection of engine rotating speed and is used for the detection of engine cooling water temperature.
For example, according to this example embodiment, thereby altogether rail body 520, strut 21 and the pipe jointing part of rail 51 be make respectively and be bonded to each other by welding process or fastening process and form rail 51 altogether.Rail body 520 is accumulated fuel under high pressure in inside.Strut 21 is used for fixed component that rail body 520 is attached to motor etc.Strut 21 can have aforesaid configuration and can be attached on the rail body in the above described manner.Pipe jointing part comprises connector 522 and joint 23.Pipe jointing part is used to connect high pressure pump line 56 or gun hose 57.
Rail body 520 is made by the iron group metal material.The profile of rail body 520 forms the shape of cylindrical pillars substantially.
The pressure accumulating chamber that is used to accumulate fuel under high pressure is formed at rail body 520 inside, and pressure accumulating chamber just in axial direction penetrates in the rail body 520 like this.The axial centre of pressure accumulating chamber can perhaps can overlap with the center of rail body 520 with respect to the off-centring of rail body 520.
In two ends of rail body 520, form tapped hole so that voltage limiter 60 and pressure transducer 65 to be installed.
In Figure 26, on the upper surface of rail body 520, formed first plane 524 of 522 combinations of connector in a longitudinal direction.
In Figure 26, along the engagement groove 25 that on the lower surface of rail body 520, forms 21 combinations of strut perpendicular to the longitudinal direction of rail body 520.
Rail body 520 is formed with the inside and outside intercommunicating pore 526 of radially extension so that pressure accumulating chamber and external communications.Inside and outside intercommunicating pore 526 with manage in 56,57 each be communicated with.Inside and outside intercommunicating pore 526 forms at the proper spacing place with respect to the axial direction of rail body 520.The outside opening of each inside and outside intercommunicating pore is substantially at the central opening on first plane 524.
Pipe jointing part comprises connector 522, and connector 522 is fixed firmly on the rail body by welding process, and pipe jointing part also comprises joint 23, and joint 23 is threaded in the connector 522 and is fixed on the rail body 520.
Connector 522 is made by the iron group metal material.The profile of connector 522 forms cylindrical shape substantially.Connector 522 is welded on the rail body 520, and then, joint 23 is threaded in the connector 522.Therefore, joint 23 is fixed on the rail body 520.Connector screw thread (being internal thread in the present embodiment) 527 is formed on the inner circumferential surface of connector 522.
On the cylindrical body center of connector 522 and the position that the open centre of inside and outside communication passage 526 overlaps, connector 522 is attached on first plane 524 of rail body 520 by the resistance welding process therein.
Joint 23 is made by the iron group metal material.The profile of joint 23 forms the shape of cylindrical pillars substantially.Joint passage 28 is formed at the axial centre of joint 23.
Main body side outside thread 29 is formed on the end of joint 23.Main body side outside thread 29 is threaded in the connector screw thread 527.Pipe side outside thread 30 is formed on the other end of joint 23.Anchor clamps assembled portion (hexagonal part) 23a is formed between main body side outside thread 29 and the pipe side outside thread 30.
Second plane 31 is formed on the end face of joint 23, has formed main body side outside thread 29 on it.Second plane 31 overlaps with first plane 524 of rail body 520.More specifically, second plane 31 is formed on the end face of main body side outside thread 29 around joint passage 28.
Main body side outside thread 29 is threaded in the connector screw thread 527, and the top of main body side outside thread 29 is shifted onto in the connector 522 dearly.Therefore, be communicated with inside and outside intercommunicating pore 526 at the joint passage 28 of second plane, 31 split sheds at first plane, 524 split sheds, and second plane 31 around joint passage 28 is pressed on first plane 524 of inside and outside intercommunicating pore 526, thereby forms body seal surface (oily close surface) 532.
Used connector 522 wherein to be welded to structure on first plane 524 of rail body 520 according to this example embodiment's common rail 51.
If connector only can be put on first plane of rail body and weld, connector just can move on first plane at an easy rate so.Therefore, the welding precision of connector will be subjected to the influence of the accuracy to shape of welding fixture.Therefore, be difficult to use highi degree of accuracy that connector is welded on the rail body.
Therefore, in this example embodiment of the present invention, localization part 540 is formed on the position that wherein rail body 520 and connector 522 contact with each other in welding process, and rail body 520 and connector 522 just are fitted to each other at localization part 540 places like this.
Rail body 520 and connector 522 were fitted to each other at localization part 540 places before carrying out welding process.This example embodiment's localization part 540 is that the projection (positioning pawl) 542 that forms on the top of the cavity (positioning groove) that forms on first plane 524 by rail body 520 and connector 522 provides.Rail body 520 and connector 522 position by projection 542 is put into cavity 541.
Projection 542 be shaped as annular, be continuously along the top of connector 522 in this example.Cavity 541 is continuous circular grooves, and its diameter diameter with the projection 542 of connector 522 in this example is identical.Cavity 541 forms coaxially with the outside opening of inside and outside intercommunicating pore 526.
When connector 522 electric welding were received on the rail body 520, at first, the annular projection 542 that forms on the top of connector 522 just was placed in the ring cavity 541 that forms on first plane 524 of rail body 520.Then, the electrode of welding set just applies normal load along the arrow mark shown in Figure 27 A on connector 522 on first plane 524.Then, on rail body 520 and connector 522, apply high pressure and high-intensity currrent.Therefore, the contacting part of rail body 520 and connector 522 just is welded into annular shape, shown in Figure 27 D.Shadow region among Figure 27 D " A " expression weld part.The mating part of cavity 541 and projection 542 is covered by welding process by connector 522.
Then, joint 23 is threaded to the inside of connector 522, thereby forms rail 51 altogether, and each in the pipe 56,57 can be connected on the common rail 51.
This embodiment's common rail 51 can be to be total to rail by the combination that welding rail body 520 and connector 522 are made.The localization part 540 at rail body 520 and connector 522 places of being fitted to each other is formed at the position that wherein rail body 520 and connector 522 contact with each other when carrying out welding process.Welding process is carried out when projection 542 is put into cavity 541.Therefore, rail body 520 and connector 522 can weld under the situation that keeps high welding precision.
Therefore, by form localization part 540 at rail body 520 and connector 522 contacting part places, can improve between rail body 520 and the connector 522 in conjunction with precision.More specifically, can with simple and cheap mode safely mode improve between rail body 520 and the connector 522 in conjunction with precision.
Localization part 540 is to be provided by the projection 542 that forms on cavity 541 that forms in the rail body 520 and the connector 522.Cavity 541 and projection 542 form tubular shape to be fitted to each other.Therefore, rail body 520 and connector 522 can be welded to one another safely and circularize shape, and can obtain very high weld strength.
Shown common rail among Figure 28 A to 28D according to another example embodiment of the present invention.This embodiment's common rail is a sleeve type rail altogether, and its type is usually as shown in Figure 35 C.
Conical pressure receives seat surface 634 and is formed on first plane 624 of rail body 620.Inside and outside intercommunicating pore 626 is uncovered in the bottom that pressure receives seat surface 634.Connector screw thread (being outside thread in the present embodiment) 627 is formed on the external peripheral surface of connector 622.
This embodiment's common rail can be to be total to rail by the combination that welding rail body 620 and connector 622 are made.In this embodiment, localization part 640 is that cavity 641 and projection 642 by the contacting part place of rail body 620 and connector 622 provides.Rail body 620 and connector 622 are fitted to each other at localization part 640 places.The bound fraction that therefore, when carrying out welding process, can accurately keep rail body 620 and connector 622.Therefore, can improve safely between rail body 620 and the connector 622 in conjunction with precision.
Shown common rail among Figure 29 A to 29D according to another example embodiment of the present invention.Annular projection 742 is formed on the connector 722, and cavity (groove) 741 is formed on first plane 724 of rail body 720.Inside and outside intercommunicating pore 726 is formed in first plane 724.Connector screw thread 727 is formed on the inner circumferential surface of connector 722.The excircle of projection 742 is put into cavity 741.On the part that cavity 741 is formed in first plane 724 with connector 722 is connected.Cavity 741 forms the shape of the groove with rounded bottom (surface is parallel to first plane 724).Annular projection 742 is coupled in the rounded bottom of cavity 741.More specifically, the excircle of annular projection 742 overlaps with the circumference of cavity 741, and annular projection 742 is put into cavity 741 inside.Therefore, annular projection 742 and cavity 741 provide localization part 740.
Therefore, when carrying out welding process, the precision of the binding site of rail body 720 and connector 722 can be remained on very high precision.Therefore, can improve safely between rail body 720 and the connector 722 in conjunction with precision.
Shown common rail among Figure 30 A to 30D according to an alternative embodiment of the invention.The base portion 844 of connector 822 (being attached to the part on the rail body 820) forms simple cylindrical shape.Cavity 841 is formed on first plane 824.Inside and outside intercommunicating pore 826 is formed in the bottom surface of cavity 841.Thereby the outer circle wall of cavity 841 attenuation gradually forms conical surface 841a, and its diameter outwards increases gradually.The periphery of base portion 844 contacts with conical surface 841a.Connector screw thread 827 is formed on the inner circumferential surface of connector 822.
Therefore, when applying normal load against first plane 824 when carrying out the resistance welding process on connector 822, the center of connector 822 can be by the conical surface 841a of cavity 841 and the center-aligned of cavity 841.Cavity 841 with conical surface 841a provides localization part 840.Therefore, though on connector 822, do not form projection, can be by improve the Location accuracy between rail body 820 and the connector 822 at formation cavity 841 on the rail body 820.Therefore, can limit and be used for positioning cost.
Shown common rail among Figure 31 A to 31D according to another one embodiment of the present invention.
In the common rail according to this embodiment, projection 942 is formed on first plane 924 of rail body 920, and projection 942 is assembled in the connector 922.
More specifically, projection 942 is the circular protrusions that form on first plane 924.The upper surface of projection 942 is parallel with first plane 924.The center of circular protrusions 942 overlaps with the center of the outside opening of inside and outside intercommunicating pore 926.
Cavity 941 (end difference) 941 is formed on the lower surface (surface that contacts with rail body 920) of connector 922.Cavity 941 overlaps with projection 942 and cooperates with it.The degree of depth of cavity 941 is arranged to the height greater than projection 942.When carrying out welding process, thereby electric current flows on the top of the tip that accumulates in contact first plane 924 each other and connector 922.Cavity 941 provides localization part 940 with projection 942.The part that is fitted to each other in cavity 941 and the projection 942 is covered by welding process by connector 122.
Therefore, when carrying out welding process, can accurately keep the binding site of rail body 920 and connector 922, and can improve safely between rail body 920 and the connector 922 in conjunction with precision.
The cavity 941 of connector 922 can omit, and locatees in the inner peripheral wall that can be coupled to connector 922 by the projection 942 that will form on the rail body 920 and realize.
Shown common rail among Figure 32 A to 32D according to another one embodiment of the present invention.
Connector 1022 according to this embodiment is attached on the rail body 1020 by laser beam welding.Connector screw thread 1027 is formed on the inner circumferential surface of connector 1022.Base portion 1044 is formed on the part that contacts with rail body 1020 in the connector 1022.Other parts with connector 1022 are compared, and base portion 1044 extends radially outward.The lower surface of base portion 1044 (with the surface of rail body 1020 contact) is the plane that overlaps with the bottom surface of cavity 1041 (plane parallel with first plane 1024).Inside and outside intercommunicating pore 1026 is formed in the bottom surface of cavity 1041.When its lower surface is watched base portion 1044, base portion 1044 forms rectangular shapes (be square in the example shown).Yet the shape of base portion 1044 is not limited to rectangular shape.Can be with any for example another kind of polygonal shape of other shape or circular shape as base portion 1044.
Localization part 1040 according to this embodiment is to form cavity 1041 on rail body 1020.The base portion 1044 of connector 1022 is placed in the cavity 1041.More specifically, cavity 1041 is grooves, has the rectangular base of the position formation of joint connector 1022 on first plane 1024.Rectangular base 1044 is coupled on the rectangular base of cavity 1041.The periphery of rectangular base 1044 overlaps with the circumference of cavity 1041.Therefore, base portion 1044 is coupled to the inside of cavity 1041.
When connector 1022 was laser-welded on the rail body 1020, the base portion 1044 of connector 1022 was put into cavity 1041, and cavity 1041 is formed on 1020 first plane 1024 and has rectangular base.Then, the mating part of cavity 1041 and base portion 1044 welds by laser beam welding around the zone.
Then, joint 23 is fastened in the connector 1022.Therefore just finished and managed each common rail that can be connected thereto of 56,57.
Therefore, under the situation that rail body 1020 and connector 1022 weld by laser beam welding, can keep the very high precision of binding site between rail body 1020 and the connector 1022 therein.Therefore, can improve between rail body 1020 and the connector 1022 in conjunction with precision.
In this embodiment, can carry out the location by on first plane 1024 of rail body 1020, forming cavity 1041.Therefore, can limit the required cost in execution location.
Can in joint 23, be formed for reducing the hole of pressure pulsation.Forming porose plate can insert between joint 23 and the rail body 520,620,720,820,920,1020.Can in joint 23, set the mobile damper that is used to reduce pressure pulsation.Can set safety valve stops fuel to flow through joint 23 when the fuel flow rate through joint 23 increases.
Connector 522,622,722,822,922,1022 and joint 23 can be integrated, are welded to rail body 520,620,720,820,920,1020 then.
The present invention should not be limited to the disclosed embodiments, but can not break away from the scope of the present invention that is defined by appended claims with many alternate manners realizations.

Claims (23)

1. one kind is used for by soldering connector element (6,21,215,315,415,522,622,722,822,922,1022) be attached to method on the metal base material, described metal base material is used for will being total to the pressure accumulation fuel injection system that the fuel under high pressure of accumulating in the rail (1,51) is injected internal-combustion engine through sparger (4,52), wherein, connector element (6,21,215,315,415,522,622,722,822,922,1022) be formed with joint, metal base material comprises by being used to engage connector element (6,21,215,315,415,522,622,722,822, the projection of joint 922,1022) or at least one localization part that defines in the groove, described method is characterised in that:
In office, described positioning part described connector element (6,21,215,315,415,522,622,722,822,922,1022) is joined on the metal base material; And
Carry out soldering in the time of on the localization part that joint is placed metal base material.
2. the method for claim 1 is characterized in that:
Joint forms tubular shape (6b), and tubular shape (6b) has the thickness that reduces gradually towards its top; And
Joint is formed with projection (6c, 542,642,742) on its top.
3. method as claimed in claim 2 is characterized in that, metal base material is formed with annular groove (1b, 541,641) in its surface.
4. method as claimed in claim 3 is characterized in that, projection (6c, 542,642,742) inner circumferential side and at least one in the outer circumferential sides are by groove (1b, 541,641) at least one restriction in the side is by this to connector element (6,21,215,315,415,522,622,722,822,922,1022) position.
5. the method for claim 1 is characterized in that, metal base material is formed with groove (201c, 301e, 401c, 741,841,1041) in its surface.
6. as each described method in the claim 1 to 5, it is characterized in that:
Fuel injection system has the high-voltage tube (7,57) that is used for supplying to sparger (4,52) from common rail (1,51) fuel under high pressure; And
Connector element (6,21,215,315,415,522,622,722,822,922,1022) is to be used for as metal base material high-voltage tube (7,57) being connected to tube connector (6,522,622,722,822,922,1022) on the common rail (1,51).
7. as each described method in the claim 1 to 5, it is characterized in that:
Fuel injection system has and is used for through fuel pipe (13,56) to the fuel feed pump (2,53) of rail (1,51) pressure feed fuel altogether; And
Connector element (6,21,215,315,415,522,622,722,822,922,1022) is to be used for as metal base material fuel pipe (13,56) being connected to tube connector (6,522,622,722,822,922,1022) on the common rail (1,51).
8. as each described method in the claim 1 to 5, it is characterized in that connector element (6,21,215,315,415,522,622,722,822,922,1022) be to be used for as metal base material to being total to the connector that rail (1,51) connects pressure transducer (65), reduction valve (61) or pressure regulator.
9. as each described method in the claim 1 to 5, it is characterized in that connector element (6,21,215,315,415,522,622,722,822,922,1022) is to be used for as metal base material carriage being fixed to fixed connector on the common rail (1,51).
10. as each described method in the claim 1 to 5, it is characterized in that:
Fuel injection system has and is used for through fuel pipe (13,21) to the fuel feed pump (2,53) of rail (1,51) pressure feed fuel altogether; And
Connector element (6,21,215,315,415,522,622,722,822,922,1022) is to be used for fuel pipe (13,21) being connected to tube connector on the cylinder cap of fuel feed pump (2,53) as metal base material.
11., it is characterized in that as each described method in the claim 1 to 5:
Fuel injection system has the high-voltage tube (7,57) that is used for supplying to sparger (4,52) from common rail (1,51) fuel under high pressure; And
Connector element (6,21,215,315,415,522,622,722,822,922,1022) is to be used for high-voltage tube (7,57) being connected to tube connector on the main body of sparger (4,52) as metal base material.
12. be used for handling the installation strut (21 that will form cylinder form by resistance welding, 215,415) be attached to the common rail (1 of pressure accumulation fuel injection system, 51) method on, the external peripheral surface of described installation strut has circular section, and the pressure accumulation fuel injection system is through sparger (4,52) will be total to rail (1,51) fuel under high pressure of accumulating in is injected internal-combustion engine, wherein, is total to rail (1,51) by strut (21 is installed, 215,415) be installed on the internal-combustion engine, and wherein be total to rail (1,51) be formed with the localization cavity (25 that has predetermined width along its longitudinal direction, 201c, 401c), described method comprises:
At the external peripheral surface of strut (21,215,415) by along localization cavity (25,201c, during two edge clampings of the localization cavity that longitudinal direction 401c) sets, strut (21,215 will be installed, 415) be attached to common rail (1,51) on, strut (21,215 by this, 415) will be with respect to the longitudinal direction location that is total to rail (1,51).
13. method as claimed in claim 12 is characterized in that:
Altogether rail (1,51) is in that (25, two edge that 201c, longitudinal direction 401c) set is formed with chamfered part (201d) along localization cavity; And
The external peripheral surface (21,215,415) that strut is installed is by chamfered part (201d) clamping, and strut (21,215,415) is positioned by this.
14., it is characterized in that as claim 12 or 13 described methods:
Strut (21,215,415) is installed is formed with flange portion (415d) in two ends of cylinder form; And
Rail is formed with the localization part (401f) that cooperates two flange portions (415d) that strut (21,215,415) is installed altogether.
15. be used for handling the common rail (1 that the installation strut (315) that will have localization cavity (315b) is attached to the pressure accumulation fuel injection system by resistance welding, 51) method on, described localization cavity (315b) has predetermined width, and the pressure accumulation fuel injection system is through sparger (4,52) will be total to rail (1,51) fuel under high pressure of accumulating in is injected internal-combustion engine, wherein, be total to rail (1,51) be installed on the internal-combustion engine by strut (315) is installed, and wherein altogether rail (1,51) be formed with external peripheral surface with circular section, strut (315) is installed is attached on the described external peripheral surface, described method comprises:
When the external peripheral surface contact of two edges of localization cavity (315b) and common rail (1,51) with circular section, strut (315) will be installed be attached to common rail (1,51), the center of localization cavity (315b) is with regard to the center-aligned of rail (1,51) together like this.
16. method as claimed in claim 15 is characterized in that:
Install strut (315) two edges of localization cavity (315b) be formed with chamfered part (315c) and
External peripheral surface with common rail (1,51) of circular section contacts with chamfered part (315c), positions strut (315) is installed by this.
17., it is characterized in that as claim 15 or 16 described methods:
Rail (1,51) is formed with recessed positioning groove (301e) altogether, and positioning groove (301e) has predetermined width with respect to its longitudinal direction on its external peripheral surface; And
Strut (315) is installed is put into positioning groove (301e), strut (315) is installed by this with respect to the longitudinal direction location that is total to rail (1,51).
18. one kind is total to rail (1,51), have first member and second member that are welded to one another together, first member comprises localization part, localization part is to be defined by in a locational projection or groove at least one, first member and second member contact in this position when carrying out welding, and wherein, first member and second member cooperate to be engaged with each other at localization part.
19. rail (1,51) altogether as claimed in claim 18 is characterized in that localization part is by the cavity that forms (1b, 541 on first member, 641,741) and on second member, form and with cavity (1b, 541,641,741) projection of Pei Heing (6c, 542,642,742) provides.
20. rail (1,51) altogether as claimed in claim 19 is characterized in that:
Projection (6c, 542,642,742) forms tubular shape; And
Cavity (1b, 541,641,741) forms the shape of circular groove, and circular groove cooperates with projection (6c, 542,642,742), perhaps forms the shape of groove, the excircle and the groove fit of projection (6c, 542,642,742).
21. rail (1,51) altogether as claimed in claim 18 is characterized in that:
Localization part is the cavity (1b, 201c, 301e, 401c, 541,641,741,841,1041) that forms on first member; And
At least a portion of second member is put in the cavity (1b, 201c, 301e, 401c, 541,641,741,841,1041).
22., it is characterized in that cavity (1b, 201c, 301e, 401c, 541,641,741,841,1041) is formed on the plane (524,624,724,824,1024) of first member as each described rail (1,51) altogether in the claim 19 to 21.
23., it is characterized in that one of first and second members are the rail body (1,201 that is used for accumulating therein fuel under high pressure as each described rail altogether in the claim 18 to 22,301,401,520,620,720,820,920,1020) another, and in first and second members is to be used for pipe is connected to tube connector (6 on the common rail, 522,622,722,822,922,1022) a part.
CNB200510099221XA 2004-09-10 2005-09-09 Common rail Expired - Fee Related CN100460662C (en)

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JP2004264455A JP4069913B2 (en) 2004-09-10 2004-09-10 Joining member joining method and attachment stay joining method used in an accumulator fuel injection system
JP049543/2005 2005-02-24

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