CN106401681A - Automobile engine camshaft neck structure - Google Patents
Automobile engine camshaft neck structure Download PDFInfo
- Publication number
- CN106401681A CN106401681A CN201610987088.XA CN201610987088A CN106401681A CN 106401681 A CN106401681 A CN 106401681A CN 201610987088 A CN201610987088 A CN 201610987088A CN 106401681 A CN106401681 A CN 106401681A
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- axle journal
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- axle
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/102—Lubrication of valve gear or auxiliaries of camshaft bearings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses an automobile engine camshaft neck structure which comprises an upper bearing cover, a camshaft, a cylinder cover, camshaft bearing cover bolts and a camshaft front bearing cover and is characterized in that the camshaft is installed on the cylinder cover and is provided with the upper bearing cover; the upper bearing cover and the cylinder cover are fixed together through the camshaft bearing cover bolts; the camshaft front bearing cover is installed at the left part of the camshaft; special-shaped groove structures used for injecting oil are arranged on a shaft neck A section, a shaft neck B section, a shaft neck C section and a shaft neck D section of the camshaft respectively. According to the automobile engine camshaft neck structure, with adoption of three-section type profile design, shaft holes formed by the shaft neck A section, the shaft neck B section, the shaft neck C section and the shaft neck D section of the camshaft, the upper bearing cover and the cylinder cover are in mutual clearance fit; and with adoption of a design of increasing the volume of an oil chamber by opening the special-shaped groove structures, friction of the shaft holes is lowered, the grooving width is reasonably selected, the problem of vibration caused by high-speed rotation is solved, the high-speed NVH requirement is met, and the automobile engine camshaft neck structure is applied to the technical field of automobile engines.
Description
Technical field
The present invention relates to one of technical field of automobile engine camshaft of car engine journal structure.
Background technology
At present, camshaft of car engine is the vital part of car engine timing system.In order to meet electromotor not
Break and put forward high-power demand, automobile engine power loss everywhere is proposed with certain requirement, at cam journal fit structure
Unexceptional.In the prior art, open at generally using adjustment tolerance fit or in axle journal and to realize power by the way of " annular groove " and carry
Rise.Adjustment fit dimension can because processing after each axle journal entity size compared with design size fluctuate and cause actual mated condition bad.
And camshaft is designed reducing friction area, is increased fluid reserves at axle journal using " annular groove " structure, right
Actual power lifting effect is also limited.On the other hand, due to the raising further of engine speed, groove structure is because of processing problems
Easily cause camshaft journal abrasion uneven, produce circular runout, cause electromotor NVH to be lifted.Above two measures are all to work(
Rate lifting is limited.Therefore research and develop a kind of camshaft of car engine journal structure and be always new problem anxious to be resolved.
Content of the invention
It is an object of the invention to provide a kind of camshaft of car engine journal structure, this invention is using special-shaped slot structure
Axle journal, increases grease chamber volume, reduces friction area between axle journal and bearing block, improves friction environment, bearing friction makes moderate progress, and
High speed NVH is inconspicuous, can form more preferably oil film, reduces friction loss further.
The object of the present invention is achieved like this:A kind of camshaft of car engine journal structure, including upper ball cover, convex
Wheel shaft, cylinder head, camshaft bearing bonnet bolt, front bearing cover of cam shaft, install camshaft in cylinder head, pacify on camshaft
Load onto bearing cap, by camshaft bearing bonnet bolt, upper ball cover and cylinder head are fixed together, front bearing cover of cam shaft is pacified
Be contained in the left part of camshaft, the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal D section on be provided for oiling
Special-shaped slot structure;
A kind of operation principle of described camshaft of car engine journal structure is that special-shaped slot molded line combines Taylor series and stream
Body lubricate correlation theory, take three-stage Profile Design, camshaft axle journal A section, axle journal B section, axle journal C section, axle journal D section
Axially arranged abnormity slot structure, the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal D section and upper bearing (metal) around oil filler point
The axis hole that lid, cylinder head are formed is coordinated by gap;In view of factors such as camshaft dynamic balancing, and camshaft during real-world operation
Circular runout, will, the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal D segment type line are tentatively uniformly distributed, camshaft
360/n ° of the deflection relatively of axle journal A section, axle journal B section, axle journal C section, axle journal D segment type phase of line, the axle journal A section of camshaft, axle journal B
Section, axle journal C section, axle journal D section fluting take numerical control mill technique, collectively constitute class sliding bearing structure;Using special-shaped slot structure, increase
The design of big grease chamber volume, reduces axis hole friction, Rational choice groove width, mitigates the vibration problem causing because of high-speed rotation,
Meet high speed NVH to require, the axle journal A section of camshaft, axle journal B section, axle journal C section, the groove of axle journal D section abnormity slot structure are different from general
Logical annular groove be in groove depth and shape;This groove deep is only consistent with common annular groove in maximum, and remaining direction is compared with deep
Degree annular groove becomes regular and reduces, and all reduces axis hole directly contact area, increase machine oil the axle journal A section of camshaft, axle journal B section,
Amount of storage at axle journal C section, axle journal D section, advantageously reduce the axle journal A section of camshaft, axle journal B section, axle journal C section, at axle journal D section
Friction, strengthens greasy property, though series expansion item is declined slightly compared with other order effects, difficulty of processing reduces, process time
Shorten, relatively meet process design, after carry out cae analysis, small range adjustment angle is to meet optimal design;
A kind of use of described camshaft of car engine journal structure and operational approach are that upper ball cover, cylinder head are passed through
Bolt connection, during use, is linked together with cylinder head by upper ball cover, realizes normal fortune by engine timing system
Turn;
A kind of processing technique of described camshaft of car engine journal structure is, cylinder head front bearing retainer 5, upper ball cover warp
Camshaft bearing bonnet bolt is twisted in cylinder head, unloads cylinder head front bearing retainer, upper ball cover after being integrally machined camshaft shaft hole,
Load the section of A containing axle journal, axle journal B section, axle journal C section, the camshaft of axle journal D segment structure, then tighten order, screw-down torque according to certain
Tighten upper ball cover;Cam shaft hole machined divides two kinds of cutters to be processed successively;Using below cylinder head as positioning datum, milling
Cut processing upper surface, rough mill the camshaft hole of cylinder head;According to the order of Fig. 4, by camshaft-bearing cap bolt tightening cylinder
After lid front bearing retainer, upper ball cover, with molding cutter I finish-milling single order camshaft hole, rough mill second order camshaft hole;Then use molding
Cutter II finish-milling second order camshaft hole, rough mills+finish-milling three, four, five rank camshaft hole;Take 3-4mm mini milling cutter, by conversion
Head is connected with numerical control machining center main shaft, enrolls curved dies and moved towards with determining cutter in numerical control machining center;
The axle journal A section of described camshaft, axle journal B section, axle journal C section, the Profile Design of axle journal D section are to be uniformly distributed, camshaft
Axle journal A section, axle journal B section, axle journal C section, axle journal D segment type phase of line deflect 360/n ° so that when electromotor operate, counteracting is different
Shape groove produce inertia force, meet requirement for dynamic balance, after carry out CAE lubrication, mode, stress analysis, small range adjustment angle with
Dynamic balancing is made to be met;
At described camshaft list, axle journal molded line is amplified based on Taylor series and is calculated, and takes I, II, III three-stage knot
Structure, every section at a distance of 120 °;Groove depth bosom compared with axle journal depth 0.5-1mm, the initial stage design choosing value 0.5mm, by topological criteria according to
Cae analysis are optimized to this value;The special-shaped groove processing of axle journal should seamlessly transit, and continual curvature does not produce cusp, it is to avoid unfavorable
Defect in axle journal intensity produces;The processing of special-shaped slot tail end takes straight line feed form to process, and angle is compared with 30 ° of Fig. 5 radial deflection;
The axle journal A section of described camshaft, axle journal B section, axle journal C section, axle journal D section profile processing take mini milling cutter, by turning
Change head to be connected with five-shaft linkage numerical control machining center cutter spindle, enroll curved dies in numerical control machining center to determine knife
Tool trend;Starting point is special-shaped slot head end, and cutter Z-Y, to feeding, is machined to 30 ° of groove bosom tailing edge and walks out, and rotates cam
Axle, repeats this operation.
The present invention is characterized by its structure, operation principle and processing technique.
A kind of camshaft of car engine journal structure compared with prior art, has using opening special-shaped slot structure, increases
The design of grease chamber volume, reduces axis hole friction, Rational choice groove width, mitigates the vibration problem causing because of high-speed rotation, full
The advantages of sufficient high speed NVH requires, will be widely used in technical field of automobile engine.
Brief description
Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail.
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the F-F sectional view of Fig. 1.
Fig. 3 is the structural representation of cam shaft neck portion of the present invention.
Fig. 4 is that precedence diagram tightened by Fig. 1 bolt in machining cam axle axis hole.
Fig. 5 is the E-E sectional view of Fig. 3.
Fig. 6 is the A section special-shaped slot section of structure of Fig. 2.
Fig. 7 is the B section special-shaped slot section of structure of Fig. 2.
Fig. 8 is the C section special-shaped slot section of structure of Fig. 2.
Fig. 9 is the D section special-shaped slot section of structure of Fig. 2.
Specific embodiment
Referring to the drawings, a kind of camshaft of car engine journal structure, including upper ball cover 1(At 4), camshaft 2, cylinder
Lid 3, camshaft bearing bonnet bolt 4, front bearing cover of cam shaft 5(At 1), on the head 3 camshaft 2 is installed, on camshaft 2
Upper ball cover 1 is installed, by camshaft bearing bonnet bolt 4 by upper ball cover 1(At 4)It is fixed together with cylinder head 3, camshaft
Front bearing retainer 5(At 1)It is arranged on the left part of camshaft 2, in the axle journal A section of camshaft 2, axle journal B section, axle journal C section, axle journal D section
On be provided for the special-shaped slot structure of oiling.
A kind of operation principle of described camshaft of car engine journal structure is that special-shaped slot molded line combines Taylor series
And fluid lubrication correlation theory, take three-stage Profile Design, camshaft 2 axle journal A section, axle journal B section, axle journal C section, axle
Around neck D section oil filler point axially arranged abnormity slot structure, the axle journal A section of camshaft 2, axle journal B section, axle journal C section, axle journal D section with
The axis hole that upper ball cover 1, cylinder head 3 are formed is coordinated by gap;In view of factors such as camshaft 2 dynamic balancing, and actual fortune
Camshaft 2 circular runout when turning, will, the axle journal A section of camshaft 2, axle journal B section, axle journal C section, axle journal D section(Sent out with in-line four cylinder
As a example motivation)Molded line is tentatively uniformly distributed, the axle journal A section of camshaft 2, axle journal B section, axle journal C section, axle journal D segment type phase of line phase
To 360/n ° of deflection(N is axle journal number), the axle journal A section of camshaft 2, axle journal B section, axle journal C section, axle journal D section fluting take number
Control miller skill, collectively constitutes class sliding bearing structure;Using special-shaped slot structure, increase the design of grease chamber volume, reduce axis hole and rub
Wipe, Rational choice groove width, mitigate the vibration problem causing because of high-speed rotation, meet high speed NVH and require, the axle of camshaft 2
What neck A section, axle journal B section, axle journal C section, the groove of axle journal D section abnormity slot structure were different from common annular groove is in groove depth and shape
Shape;This groove deep is only consistent with common annular groove in maximum, and remaining direction is compared same depth annular groove and become regular reduction, all reduces
Axis hole directly contact area, increases storage at the axle journal A section of camshaft 2, axle journal B section, axle journal C section, axle journal D section for the machine oil
Amount, advantageously reduces the axle journal A section of camshaft 2, axle journal B section, axle journal C section, rubs at axle journal D section, strengthen greasy property, though level
Number launches item and is declined slightly compared with other order effects, but difficulty of processing reduces, process time shortens, and relatively meets production technology and sets
Meter, after carry out cae analysis, small range adjustment angle is to meet optimal design.
A kind of described camshaft of car engine journal structure using and operational approach be, upper ball cover 1, cylinder head
3 are bolted, and during use, are linked together with cylinder head 3 by upper ball cover 1, are realized by engine timing system
Run well.
A kind of processing technique of described camshaft of car engine journal structure is, cylinder head front bearing retainer 5, upper bearing (metal)
Lid 1(At 4)Twist in cylinder head 3 through camshaft bearing bonnet bolt 4, after being integrally machined camshaft 2 axis hole, unload cylinder head front axle
Hold lid 5, upper ball cover 1(At 4), load the section of A containing axle journal, axle journal B section, axle journal C section, the camshaft 2 of axle journal D segment structure, then according to
Certain tighten order, screw-down torque tightens upper ball cover 1;Camshaft 2 axis hole two kinds of cutters of processing point are processed successively;With
Cylinder head 3, below as positioning datum, Milling Process upper surface, rough mills the camshaft hole of cylinder head 3;According to the order of Fig. 4, lead to
Cross camshaft bearing bonnet bolt 4 and fasten cylinder head front bearing retainer 5, upper ball cover 1(At 4)Afterwards, convex with molding cutter I finish-milling single order
Axle hole, rough mills second order camshaft hole;Then use molding cutter II finish-milling second order camshaft hole, rough mill+finish-milling three, four, five rank
Camshaft hole;Take 3-4mm mini milling cutter(Choose according to actual demand), it is connected with numerical control machining center main shaft by conversion head,
Enroll curved dies to move towards to determine cutter in numerical control machining center.
The axle journal A section of described camshaft 2, axle journal B section, axle journal C section, axle journal D section(Shown in Fig. 3)Profile Design is equal
Even distribution(As shown in Fig. 6-Fig. 9), the axle journal A section of camshaft 2, axle journal B section, axle journal C section, the deflection of axle journal D segment type phase of line
So that when electromotor operates, offset the inertia force that special-shaped slot produces, meet requirement for dynamic balance for 360/n °, after carry out CAE profit
Cunning, mode, stress analysis, small range adjustment angle is so that dynamic balancing is met.
Axle journal at described camshaft 2 is single(Shown in Fig. 3)Molded line is amplified based on Taylor series and is calculated, take I,
IIth, III three stage structure, every section at a distance of 120 °;Choosing value 0.5mm is designed compared with axle journal depth 0.5-1mm, initial stage in groove depth bosom, by
Topological criteria is optimized to this value according to cae analysis;The special-shaped groove processing of axle journal should seamlessly transit, and continual curvature does not produce point
Point, it is to avoid be unfavorable for that the defect of axle journal intensity produces;The processing of special-shaped slot tail end takes straight line feed form to process, and angle is compared with Fig. 5
30 ° of radial deflection.
The axle journal A section of described camshaft 2, axle journal B section, axle journal C section, axle journal D section profile processing take mini milling cutter(According to
Actual demand is chosen), it is connected with five-shaft linkage numerical control machining center cutter spindle by conversion head, in numerical control machining center
Enroll curved dies(Taylor series take 3 ranks)To determine cutter trend;Starting point be special-shaped slot head end, cutter Z-Y to feeding,
It is machined to 30 ° of groove bosom tailing edge(Refer at structure in 4)Walk out, rotate camshaft 2, repeat this operation.
Fig. 4 is that during machining cam axle axis hole, precedence diagram tightened by bolt, in machining cam axle axis hole, according to the priority of 1-10
Camshaft bearing bonnet bolt 4 is tightened by order.
Claims (7)
1. a kind of camshaft of car engine journal structure, including upper ball cover, camshaft, cylinder head, camshaft-bearing cap spiral shell
Bolt, front bearing cover of cam shaft it is characterised in that:In cylinder head, camshaft is installed, camshaft installs upper ball cover, passes through
Upper ball cover and cylinder head are fixed together by camshaft bearing bonnet bolt, and front bearing cover of cam shaft is arranged on a left side for camshaft
Portion, the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal D section on be provided for the special-shaped slot structure of oiling.
2. a kind of camshaft of car engine journal structure according to claim 1 it is characterised in that:A kind of described vapour
The operation principle of car engine cam shaft neck structure is that special-shaped slot molded line combines Taylor series and fluid lubrication correlation theory,
Take three-stage Profile Design, camshaft axle journal A section, axle journal B section, axle journal C section, around axle journal D section oil filler point axially
The special-shaped slot structure of setting, the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal D section and upper ball cover, cylinder head are formed
Axis hole is coordinated by gap;In view of factors such as camshaft dynamic balancing, and camshaft runout during real-world operation, will, convex
The axle journal A section of wheel shaft, axle journal B section, axle journal C section, axle journal D segment type line are tentatively uniformly distributed, the axle journal A section of camshaft, axle journal B
360/n ° of the deflection relatively of section, axle journal C section, axle journal D segment type phase of line, the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal
D section fluting takes numerical control mill technique, collectively constitutes class sliding bearing structure;Using special-shaped slot structure, increase setting of grease chamber volume
Meter, reduces axis hole friction, Rational choice groove width, mitigates the vibration problem causing because of high-speed rotation, and meeting high speed NVH will
Ask, the axle journal A section of camshaft, axle journal B section, axle journal C section, the groove of axle journal D section abnormity slot structure are different from being in of common annular groove
Groove depth and shape;This groove deep is only consistent with common annular groove in maximum, and remaining direction is compared same depth annular groove and become rule
Property reduce, all reduce axis hole directly contact area, increase machine oil in the axle journal A section of camshaft, axle journal B section, axle journal C section, axle journal D
The amount of storage at section place, advantageously reduces the axle journal A section of camshaft, axle journal B section, axle journal C section, rubs at axle journal D section, strengthen and lubricate
Performance, though series expansion item is declined slightly compared with other order effects, difficulty of processing reduces, process time shortens, and relatively meets life
Production. art design, after carry out cae analysis, small range adjustment angle is to meet optimal design.
3. a kind of camshaft of car engine journal structure according to claim 1 it is characterised in that:A kind of described vapour
The use of car engine cam shaft neck structure and operational approach are that upper ball cover, cylinder head are bolted, during use,
Linked together with cylinder head by upper ball cover, realize running well by engine timing system.
4. a kind of camshaft of car engine journal structure according to claim 1 it is characterised in that:A kind of described vapour
The processing technique of car engine cam shaft neck structure is that cylinder head front bearing retainer 5, upper ball cover are through camshaft bearing bonnet bolt
Twist in cylinder head, after being integrally machined camshaft shaft hole, unload cylinder head front bearing retainer, upper ball cover, load the section of A containing axle journal, axle
Neck B section, axle journal C section, the camshaft of axle journal D segment structure, then according to certain tighten order, screw-down torque tightens upper ball cover;Convex
Wheel shaft axis hole two kinds of cutters of processing point are processed successively;Using below cylinder head as positioning datum, Milling Process upper surface, slightly
The camshaft hole of milling cylinder head;According to the order of Fig. 4, by camshaft-bearing cap bolt tightening cylinder head front bearing retainer, upper shaft
After holding lid, with molding cutter I finish-milling single order camshaft hole, rough mill second order camshaft hole;Then use molding cutter II finish-milling second order
Camshaft hole, rough mills+finish-milling three, four, five rank camshaft hole;Take 3-4mm mini milling cutter, by conversion head and digital control processing
Heart main shaft connects, and enrolls curved dies and moved towards with determining cutter in numerical control machining center.
5. a kind of camshaft of car engine journal structure according to claim 1 or 4 it is characterised in that:Described is convex
The axle journal A section of wheel shaft, axle journal B section, axle journal C section, the Profile Design of axle journal D section are to be uniformly distributed, the axle journal A section of camshaft, axle
Neck B section, axle journal C section, axle journal D segment type phase of line deflect 360/n ° so that when electromotor operates, offsetting the used of special-shaped slot generation
Property power, meets requirement for dynamic balance, after carry out CAE lubrication, mode, stress analysis, small range adjustment angle is so that dynamic balancing obtains
Meet.
6. a kind of camshaft of car engine journal structure according to claim 1 or 4 it is characterised in that:Described is convex
At wheel shaft list, axle journal molded line is amplified based on Taylor series and is calculated, and takes I, II, III three stage structure, every section apart
120°;Compared with axle journal depth 0.5-1mm, the initial stage designs choosing value 0.5mm, by topological criteria according to cae analysis to this in groove depth bosom
Value is optimized;The special-shaped groove processing of axle journal should seamlessly transit, and continual curvature does not produce cusp, it is to avoid is unfavorable for axle journal intensity
Defect produces;The processing of special-shaped slot tail end takes straight line feed form to process, and angle is compared with 30 ° of Fig. 5 radial deflection.
7. a kind of camshaft of car engine journal structure according to claim 1 or 4 it is characterised in that:Described is convex
The axle journal A section of wheel shaft, axle journal B section, axle journal C section, axle journal D section profile processing take mini milling cutter, by conversion head and five axles connection
Dynamic numerical control machining center cutter spindle connects, and enrolls curved dies and moved towards with determining cutter in numerical control machining center;Initial
Point is special-shaped slot head end, and to feeding, be machined to 30 ° of groove bosom tailing edge walks out cutter Z-Y, rotates camshaft, repeats this behaviour
Make.
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CN201610987088.XA CN106401681A (en) | 2016-11-10 | 2016-11-10 | Automobile engine camshaft neck structure |
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CN201610987088.XA CN106401681A (en) | 2016-11-10 | 2016-11-10 | Automobile engine camshaft neck structure |
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