CN103001091A - Carbon commutator - Google Patents
Carbon commutator Download PDFInfo
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- CN103001091A CN103001091A CN201110275369XA CN201110275369A CN103001091A CN 103001091 A CN103001091 A CN 103001091A CN 201110275369X A CN201110275369X A CN 201110275369XA CN 201110275369 A CN201110275369 A CN 201110275369A CN 103001091 A CN103001091 A CN 103001091A
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Abstract
The invention relates to a carbon commutator used in an oil pump motor. The commutator comprises a copper shell, the copper shell is provided with a copper shell working end with a copper shell center shaft hole, the copper shell working end is provided with a circular end plate, a side wall protruding towards one side is arranged at the edge of the circular end plate, the other end of the side wall forms an open end, a plurality of uniformly distributed sheet jaws and split slots positioned among the sheet jaws encircle the side wall, the working end of the copper shell forms a semi-enclosed cavity, and an insulation base body with a center shaft hole is fixed on the inner side of the semi-enclosed cavity in an attaching manner, is embedded into the split slots and covers the side walls of the split slots. Since copper exposed due to cutting is covered by the insulation base body, the commutator in the oil pump motor cannot be corroded by alcoholic fuels, and further the service life of the commutator is prolonged.
Description
Technical field
The present invention relates to a kind of carbon commutator, relate in particular to a kind of commutator of the carbon for automobile-used oil pump motor.
Background technology
At present, in order to reduce vehicle emission pollution, thus add ethanol in gasoline, but but the commutator in the automobile fuel pump motor has been proposed to higher quality requirement containing the gasoline of ethanol.Because the gasoline containing ethanol has corrosion to the copper commutator, reduced the life-span of oil pump motor, therefore adopt the carbon commutator.Chinese patent literature CN101369708B discloses a kind of manufacture method of carbon commutator, said method comprising the steps of: (1) manufactures a precision copper shell; (2) copper facing after one of them surperficial first nickel plating of the annular graphite flake mated in working end forming and described precision copper shell, make it become the link of described annular graphite flake; (3) described precision copper shell is connected by welding manner with described annular graphite flake, its joint face is respectively the working end of described precision copper shell and the link of described annular graphite flake, obtains composite members; (4) described composite members is carried out to injection-compression molding, groove milling and crotch obtain finished product graphite commutator.In the document, in the manufacture method of disclosed graphite commutator, adopt the mode of welding to fix the described copper shell of connection and described graphite flake, the commutator product that adopts this kind of mode to obtain, between its graphite flake and copper shell, be connected firmly, good conductivity has advantages of that useful life is higher than the employing seccotine connects graphite flake and copper shell.But, utilize the method to manufacture commutator, first annular graphite flake and copper shell are welded and obtain a composite members, then this composite members is carried out to injection-compression molding, groove milling is carried out in unification again, and what in the process of groove milling, adopt is the mode of " cutter mills ", when graphite flake is divided into to commutator segment, need to cut off the bottom surface of copper shell, Gu depth of cut is darker.Therefore, there is following defect in applying to the oil pump motor that ethanol acts as a fuel the time in the commutator product that utilizes the method to obtain:
On the one hand, because then first injection mo(u)lding carries out groove milling, and disposable by copper shell and graphite flake cut-out, cutting width to the copper shell equals the cutting width to graphite flake, causing the bottom land inboard to have copper exposes to the open air, copper is easy to be corroded in ethanol fuel oil, thereby causes shorten the useful life of commutator, and then has influence on the useful life of whole oil pump motor; On the other hand, cut darker groove, reduced the mechanical strength of product plastic cement part, when this product being entered to the axle assembling, the risk of plastic cement cracking is arranged.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to overcome that commutator product bottom land of the prior art inboard has copper to expose to the open air to be easy to be corroded and the defect that affects commutator life-span and product plastic cement intensity, thereby a kind of commutator product that improves useful life and plastic cement intensity by improving the bottom land inside structure is provided.
For this reason, the invention provides a kind of carbon commutator, comprise a copper shell, described copper shell has a copper shell working end with copper shell central axis hole, described copper shell working end has a circular end plate, the edge of described circular end plate has to the sidewall of a side projection, the other end of described sidewall forms an openend, around described sidewall, some equally distributed pawls and the radially slot segmentation between described pawl are arranged, the open semiclosed cavity of direction towards described openend of the circular end plate of described copper shell working end and described side walls enclose, an insulating body with central axis hole is fixed in the inwall laminating of described semiclosed cavity, the connecting end surface laminating of described copper shell working end and an annular carbon plate is fixing, described annular carbon plate also has an operative end surface relative with described connecting end surface, radially be evenly distributed with cutting groove identical with described slot segmentation quantity and that arrange one to one on described operative end surface, the degree of depth of described cutting groove is not less than the thickness of described annular carbon plate, it is characterized in that: the width of described cutting groove is less than the width of described slot segmentation.
Be coated with the composite bed of ambrose alloy tin on the connecting end surface of described carbon plate.
The connecting end surface of described copper shell working end and described carbon plate is welded and fixed.
Described slot segmentation is 8.
The both sides that are positioned at each described pawl on described circular end plate respectively form a hook sheet that bends towards the axis direction of described copper shell.
In the junction of the central axis hole of described circular end plate and described copper shell and form the hook sheet bent towards away from the axis direction of described copper shell in the corresponding position with described pawl.
Carbon commutator provided by the invention has the following advantages:
1. carbon commutator of the present invention comprises a copper shell, comprise a copper shell, described copper shell has a copper shell working end with copper shell central axis hole, described copper shell working end has a circular end plate, the edge of described circular end plate has to the sidewall of a side projection, the other end of described sidewall forms an openend, around described sidewall, some equally distributed pawls and the slot segmentation between described pawl are arranged, the open semiclosed cavity of direction towards described openend of the circular end plate of described copper shell working end and described side walls enclose, an insulating body with central axis hole is fixed in the inwall laminating of described semiclosed cavity, the connecting end surface laminating of described copper shell working end and an annular carbon plate is fixing, described annular carbon plate also has an operative end surface relative with described connecting end surface, radially be evenly distributed with cutting groove identical with described slot segmentation quantity and that arrange one to one on described operative end surface, the degree of depth of described cutting groove is not less than the thickness of described annular carbon plate, the width of described cutting groove is less than the width of described slot segmentation.Because the width of cutting groove is less than the width of slot segmentation, when graphite flake is divided into commutator segment, the copper shell bottom surface is cut off, therefore depth of cut is more shallow, improved the plastic cement intensity of product, when this product is entered to the axle assembling, be conducive to prevent the risk of plastic cement cracking; While embeds described slot segmentation due to the rear described insulating body of cutting and hides the sidewall of described slot segmentation, do not have outside copper is exposed to, therefore make commutator be difficult for being corroded containing in spirituous fuel environment, improved the useful life of commutator, also just indirectly improved the useful life of oil pump motor.
2. carbon commutator of the present invention, have the composite bed of nickel-clad copper tin on the connecting end surface of described carbon plate.Nickel coating strengthened conductive layer (referring to nickel coating and copper coating) but and the adhesive bond power between the connecting end surface of carbon plate (more than reaching 10KG, described adhesion is used the method for testing of electroplating adhesion in national standard to be tested), thereby guaranteed that described conductive layer can not come off from the connecting end surface of described carbon plate, copper plate and tin coating have guaranteed the connecting end surface of described carbon plate and the solderability between described copper shell, conductivity, therefore, the conductivity that the composite bed that nickel-clad copper tin is arranged on the connecting end surface of described carbon plate is described carbon commutator and assurance is provided useful life.
3. the connecting end surface of described copper shell working end and described carbon plate is welded and fixed.In the manufacture method of carbon commutator of the present invention, the connecting end surface of described carbon plate adopts the mode of welding to be connected with described copper shell, preferably in confined space, under the temp-controlling and time-controlling condition, by heater, heat welding, use this kind of welding method to make between described carbon plate and described copper shell to be connected firmly, whole workpiece deformation is little, the carbon commutator long service life of producing, defect ware is few, steady quality.
4. the both sides that are positioned at each described pawl on described circular end plate respectively form a hook sheet that bends towards the axis direction of described copper shell; In the junction of the central axis hole of described circular end plate and described copper shell and form the hook sheet bent towards away from the axis direction of described copper shell in the corresponding position with described pawl.When the above-mentioned two kinds of hook sheets of moulding make the injection mo(u)lding insulating body, described insulating body and described copper shell have adhesion preferably, can be good at combining, and can prevent described carbon commutator film dancing in use and the generation of film flying phenomenon.
The accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is copper shell stereogram of the present invention;
Fig. 2 is the stereogram of carbon plate of the present invention;
Fig. 3 is the stereogram of carbon plate of the present invention after the copper shell is combined;
Fig. 4 is the stereogram of carbon commutator of the present invention;
Fig. 5 is the structural representation of carbon commutator of the present invention.
In figure, Reference numeral is expressed as:
1-copper shell; 2-copper shell central axis hole; The 3-circular end plate; 4-copper shell working end; 5-sheet pawl; The 6-slot segmentation; The 7-insulating body; 8-annular carbon plate; The 81-connecting end surface; The 82-operative end surface; The 10-cutting groove; The 11-openend; 12-bends towards the hook sheet of the axis direction of described copper shell; 13-bends towards the hook sheet away from the axis direction of described copper shell.
Embodiment
Core purpose of the present invention is to provide a kind of corrosion resistant useful life the higher commutator of the carbon for oil pump motor.
The core technology that realizes core purpose of the present invention is the copper exposed to the open air outside because of cutting is wrapped with insulating body, thereby improves corrosion resistance, and then the useful life of improving insulator.
Below in conjunction with accompanying drawing, a kind of embodiment of the present invention is elaborated, Fig. 1 is copper shell stereogram of the present invention; Fig. 2 is the stereogram of carbon plate of the present invention; Fig. 3 is the stereogram of carbon plate of the present invention after the copper shell is combined; Fig. 4 is the stereogram of carbon commutator of the present invention; Fig. 5 is the structural representation of carbon commutator of the present invention.
The carbon commutator that the present embodiment provides, comprise that a copper shell 1(is shown in Fig. 1), described copper shell 1 has a copper shell working end 4 with copper shell central axis hole 2, described copper shell working end 4 has a circular end plate 3, the edge of described circular end plate 3 has to the sidewall of a side projection, the other end of described sidewall forms an openend 11, around described sidewall, some equally distributed pawls 5 and the radially slot segmentation 6 between described pawl 5 are arranged, semiclosed cavity of opening towards described openend 11 directions of circular end plate 3 and the described side walls enclose of described copper shell working end 4, an insulating body 7 with central axis hole is fixed in the inwall laminating of described semiclosed cavity, described copper shell working end 4 and an annular carbon plate 8(are shown in Fig. 2) connecting end surface 81 laminating fixing, described annular carbon plate 8 also has an operative end surface 82 relative with described connecting end surface 81, radially be evenly distributed with cutting groove 10 identical with described slot segmentation 6 quantity and that arrange one to one on described operative end surface 82, the degree of depth of described cutting groove 10 is not less than the thickness of described annular carbon plate 8, the width of described cutting groove 10 is less than the width of described slot segmentation 6 and (sees Fig. 4, Fig. 5).
For conductivity and the useful life of improving the carbon commutator, in the present embodiment, be coated with the composite bed of ambrose alloy tin on the connecting end surface 81 of described carbon plate 8.
It should be noted that, copper shell provided by the invention working end 4 is also unrestricted with the connected mode of the connecting end surface 81 of described carbon plate 8, and in the present embodiment, the connecting end surface 81 of described carbon plate 8 adopts the mode of welding to be connected with described copper shell working end 4.
In addition, in order to improve the adhesion of described insulating body 7 and described copper shell 1, the both sides that are positioned at each described pawl 5 on described circular end plate 3 respectively form a hook sheet 12 that bends towards the axis direction of described copper shell 1; In the junction of described circular end plate 3 and described copper shell central axis hole 2 and forming with the corresponding position of described pawl 5 the hook sheet 13 bent towards away from the axis direction of described copper shell 1.
It should be noted that in order to realize core purpose of the present invention, the number of described cutting groove 10 is also unrestricted, and in the present embodiment, described cutting groove 10 is 8.
The manufacturing process of the carbon commutator that the present embodiment provides comprises the following steps successively:
A. manufacture the schematic diagram of a described copper shell 1 of copper shell 1(and see Fig. 1), described copper shell 1 has a copper shell working end 4 with copper shell central axis hole 2, described copper shell working end 4 has a circular end plate 3, the edge of described circular end plate 3 has to the sidewall of a side projection, the other end of described sidewall forms an openend 11, around described sidewall, some equally distributed pawls 5 are arranged, the open semiclosed cavity of direction towards described openend 11 of the inwall of the circular end plate 3 of described copper shell working end 4 and described side walls enclose;
B. adopt an annular carbon plate 8(with described copper shell working end 4 couplings to see Fig. 2), described annular carbon plate 8 comprises connecting end surface 81 and operative end surface 82;
C. described connecting end surface 81 is fixedly connected with to (see figure 3) with described copper shell working end 4;
D. from the direction of described openend 11, to described copper shell working end 4 directions, described copper shell working end 4 is cut, the thickness of cutting equals the thickness of described copper shell working end 4 (at this, the thickness that described cutting thickness is slightly larger than described copper shell working end 4 also can meet the demands), form a plurality of radially equally distributed slot segmentations 6
;
E. to copper shell central axis hole 2 injection-moulded plastics of described copper shell 1, described moulding compound forms insulating body 7, and described insulating body 7 is inserted described slot segmentation 6, hides because the cutting in described steps d is exposed to outer copper, obtains semi-finished product;
F. described semi-finished product are heat-treated;
G. the semi-finished product that obtain through described step f are first carried out to endoporus processing, end face processing, after carry out crotch, described endoporus processing, end face processing make described semi-finished product meet dimensional requirement;
H. from the direction of described operative end surface 82, to the direction of described connecting end surface 81, described carbon plate 8 is cut, the thickness that the thickness of cutting equals described carbon plate 8 (certainly, the thickness of described cutting also can meet the demands while being slightly larger than the thickness of described carbon plate 8), form 8 cutting grooves 10 that radially overlap with described slot segmentation 6, after cutting, the width of described cutting groove 10 is less than the width of described slot segmentation 6, obtains carbon commutator (seeing Fig. 4, Fig. 5).
In the present embodiment, the connecting end surface 81 of described carbon plate 8 adopts the mode of soldering to be connected with described copper shell working end 4.
In described soldering, welder used comprises a seal case, be located at least one pressing mechanism at seal case top, be located at a heater and at least one exhaust outlet on seal case, at least one fixed mechanism for fixing described copper shell 1 of seal case inside, and for controlling the control device of the temperature and time in described seal case.Described heater is positioned at the bottom of described seal case, and described exhaust outlet is positioned at the top of described seal case.
The step that the concrete technology of described soldering comprises successively is: between described copper shell working end 4 and described connecting end surface 81, solder is set, and is fixed in described seal case with described fixed mechanism; By described heater, to 1 heating of carbon plate 8 and copper shell, waste gas is driven away by exhaust outlet, simultaneously by described temperature regulating device adjusting temperature, and operates described pressing mechanism workpiece is pressurizeed, and obtains the described composite members of step c after cooling.The pressure of described pressurization is 10-300 newton.
For conductivity and the useful life of improving commutator, be coated with the composite bed of ambrose alloy tin at described connecting end surface 81 before welding, wherein nickel plating and copper facing and zinc-plated method used are Brush Plating, Brush Electroplating Technique is prior art, it adopts special-purpose DC power supply device, the positive pole of power supply is brushing plating pen, anode as brush plating, the negative pole of power supply connects workpiece, negative electrode during as brush plating, during brush plating, make the brushing plating pen that soaks full plating solution move on surface of the work with certain speed of related movement, brush plating power supply is serially connected with between the two poles of the earth, and keep suitable pressure, the position contacted with workpiece at brushing plating pen, the electric discharge crystallization occurs in the metal ion in plating solution on surface of the work and the contacted each point of anode, growth along with the time, metal crosses layer and forms.The equipment of Brush Plating mainly comprises supply unit, brushing plating pen and various auxiliary material.In the present invention during nickel plating plating solution used be six hydration nickel sulfate, amion acetic acid and glacial acetic acid, during copper facing, plating solution used is alkaline copper, its solution composition is copper sulphate, ethylenediamine, nitrilotriacetic acid, ammonium nitrate and sodium sulphate.
Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And the apparent variation of being extended out thus or change are still among the protection range in the invention.
Claims (6)
1. a carbon commutator, comprise a copper shell (1), described copper shell (1) has a copper shell working end (4) with copper shell central axis hole (2), described copper shell working end (4) has a circular end plate (3), the edge of described circular end plate (3) has to the sidewall of a side projection, the other end of described sidewall forms an openend (11), some equally distributed pawls (5) are arranged and be positioned at the radially slot segmentation (6) between described pawl (5) around described sidewall, the semiclosed cavity that direction towards described openend (11) of the circular end plate (3) of described copper shell working end (4) and described side walls enclose is open, an insulating body (7) with central axis hole is fixed in the inwall laminating of described semiclosed cavity, described copper shell working end (4) is fixing with connecting end surface (81) laminating of an annular carbon plate (8), described annular carbon plate (8) also has an operative end surface (82) relative with described connecting end surface (81), radially be evenly distributed with cutting groove (10) identical with described slot segmentation (6) quantity and that arrange one to one on described operative end surface (82), the degree of depth of described cutting groove (10) is not less than the thickness of described annular carbon plate (8), it is characterized in that: the width of described cutting groove (10) is less than the width of described slot segmentation (6).
2. carbon commutator according to claim 1, is characterized in that: the composite bed that is coated with ambrose alloy tin on the connecting end surface (81) of described carbon plate (8).
3. carbon commutator according to claim 1 and 2 is characterized in that: described copper shell working end (4) is welded and fixed with the connecting end surface (81) of described carbon plate (8).
4. according to the described carbon commutator of any one in claim 1-3, it is characterized in that: described slot segmentation (6) is 8.
5. according to the described carbon commutator of any one in claim 1-4, it is characterized in that: the both sides that are positioned at each described pawl (5) on described circular end plate (3) respectively form a hook sheet (12) that bends towards the axis direction of described copper shell (1).
6. according to the described carbon commutator of any one in claim 1-5, it is characterized in that: in the junction of described circular end plate (3) and described copper shell central axis hole (2) and bending towards the hook sheet (13) away from the axis direction of described copper shell (1) with described pawl (5) opposite position place moulding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110275369XA CN103001091A (en) | 2011-09-16 | 2011-09-16 | Carbon commutator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110275369XA CN103001091A (en) | 2011-09-16 | 2011-09-16 | Carbon commutator |
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| Publication Number | Publication Date |
|---|---|
| CN103001091A true CN103001091A (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110275369XA Pending CN103001091A (en) | 2011-09-16 | 2011-09-16 | Carbon commutator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084324A (en) * | 1992-08-14 | 1994-03-23 | 德昌电机股份有限公司 | Plane carbon block commutator and method for making thereof |
| CN1113043A (en) * | 1994-02-12 | 1995-12-06 | 德昌电机股份有限公司 | A planar carbon segment commutator |
| CN101924315A (en) * | 2009-06-16 | 2010-12-22 | 德昌电机(深圳)有限公司 | Commutator and manufacturing method thereof |
| CN202260065U (en) * | 2011-09-16 | 2012-05-30 | 深圳市凯中精密技术股份有限公司 | Carbon commutator |
-
2011
- 2011-09-16 CN CN201110275369XA patent/CN103001091A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084324A (en) * | 1992-08-14 | 1994-03-23 | 德昌电机股份有限公司 | Plane carbon block commutator and method for making thereof |
| CN1113043A (en) * | 1994-02-12 | 1995-12-06 | 德昌电机股份有限公司 | A planar carbon segment commutator |
| CN101924315A (en) * | 2009-06-16 | 2010-12-22 | 德昌电机(深圳)有限公司 | Commutator and manufacturing method thereof |
| CN202260065U (en) * | 2011-09-16 | 2012-05-30 | 深圳市凯中精密技术股份有限公司 | Carbon commutator |
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Application publication date: 20130327 |