CN206625877U - A kind of variable valve timing apparatus - Google Patents
A kind of variable valve timing apparatus Download PDFInfo
- Publication number
- CN206625877U CN206625877U CN201720405889.0U CN201720405889U CN206625877U CN 206625877 U CN206625877 U CN 206625877U CN 201720405889 U CN201720405889 U CN 201720405889U CN 206625877 U CN206625877 U CN 206625877U
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- CN
- China
- Prior art keywords
- steel ball
- housing
- sleeve
- variable valve
- valve timing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a kind of variable valve timing apparatus, including：Housing, cylindrical enclosure cavity is provided with it, the straight-line groove extended in the axial direction is provided with the inner walls；The housing is driven by engine crankshaft to be rotated；Sleeve, it is arranged in housing, the sleeve is fixedly and coaxially connected with admission cam shaft, and the both ends of the outer circumferential wall of the sleeve set fuel feed hole respectively, and two fuel feed holes are connected with two oil ducts on admission cam shaft respectively in cylinder；The sleeve outer circumferential wall upper curve groove, it axially extends and circumferentially reversed；Steel ball retainer, it is in annular, and medial surface and the sleeve lateral surface of the steel ball retainer fit, and the lateral surface of the steel ball retainer and the medial surface of housing fit；Rotatable steel ball is provided with the steel ball retainer, the steel ball fits with straight-line groove and curved slot respectively.
Description
Technical field
The utility model belongs to automobile air valve technical field, more particularly to a kind of variable valve timing apparatus.
Background technology
Variable Valve Timing Technique of IC Engine is an important technology in current automobile engine.Engine intake valve is early
Open, early close promotes valve overlap to increase, and then improves exhaust effect, improves volumetric efficiency, help to improve low turn of engine
The torque output of the fuel economy of fast active section and big torque active section.Engine intake valve evening opens, evening closes, and makes full use of gas
Inertia is flowed, improves charging efficiency, is provided safeguard for the high rotating speed of engine and high power work section.VVT is exactly
Early opened by changing engine breathing door or close evening to realize optimal valve timing, preferably take into account low engine speed with it is high
Economy and dynamic property when fast, had both improved the waste gas discharge of engine, and and can ensures the power performance of engine.
It is more to be currently based on the device species of Variable Valve Timing Technique of IC Engine, wherein with blade rotor formula cam phase
Device is most commonly seen.
Utility model content
The purpose of this utility model is that solve the defects of existing variable valve gear is complicated, and space-consuming is big, there is provided
A kind of compact-sized variable valve timing apparatus.
Technical scheme provided by the utility model is：
A kind of variable valve timing apparatus, including：
Housing, be provided with cylindrical enclosure cavity in it, be provided with the inner walls extend in the axial direction it is straight
Line groove；The housing is driven by engine crankshaft to be rotated；
Sleeve, it is arranged in housing, the sleeve is fixedly and coaxially connected with admission cam shaft, the set in cylinder
The both ends of the outer circumferential wall of cylinder set fuel feed hole respectively, and two fuel feed holes are connected with two oil ducts on admission cam shaft respectively
It is logical；The sleeve outer circumferential wall upper curve groove, it axially extends and circumferentially reversed；
Steel ball retainer, it is in annular, and medial surface and the sleeve lateral surface of the steel ball retainer fit, the steel
The lateral surface of pearl retainer and the medial surface of housing fit；Rotatable steel ball is provided with the steel ball retainer, it is described
Arc cell wall of the steel ball simultaneously respectively with straight-line groove and curved slot fits.
Preferably, one end of the housing is fixedly connected with air inlet belt wheel, and the air inlet belt wheel is meshed with Timing Belt.
Preferably, one end of the housing is fixedly connected with air inlet sprocket wheel, and the air inlet sprocket wheel is meshed with timing chain.
Preferably,
The straight-line groove is provided with 8, is circumferentially evenly arranged；
The curved slot is provided with 8, is circumferentially evenly arranged；
Steel ball on the steel ball retainer is provided with 8, is circumferentially evenly arranged.
Preferably, the curved slot circumferentially reverses 45 °.
Preferably, the both ends of the sleeve are respectively arranged with sealing ring, and back-up ring is provided with the outside of the sealing ring.
Preferably, the sleeve is fixed with admission cam shaft using interference fit.
Preferably, the housing includes the dismountable closure of body and both ends, and the closure is fixed by screw
In enclosure body.
Preferably, the steel ball is formed with steel ball retainer by hot assembly.
Preferably, the admission cam shaft passes from one end of housing.
The beneficial effects of the utility model are：The structure of variable valve timing apparatus provided by the utility model is simple, steady
It is qualitative good.The device convenient for assembly can realize the continuous variable valve of inlet and exhaust valve just in engine breathing camshaft one end
When, the problems such as effectively improving the fuel consumption and power output of engine.Therefore the changeable air valve of the utility model design
Advance/retard mechanism, there are important practical significance and application prospect.
Brief description of the drawings
Fig. 1 is variable valve timing apparatus overall assembling structural representation described in the utility model.
Fig. 2 is variable valve timing apparatus general shape structural representation described in the utility model.
Fig. 3 is shell structure schematic diagram described in the utility model.
Fig. 4 is tube-in-tube structure schematic diagram described in the utility model.
Fig. 5 is enclosure interior modular construction schematic diagram described in the utility model.
Fig. 6 is steel ball retainer structural representation described in the utility model.
Fig. 7 is the inlet valve change in displacement timing curve map that variable valve timing apparatus described in the utility model is realized.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to explanation
Book word can be implemented according to this.
The utility model provides a kind of engine variable-valve advance/retard mechanism based on belt or chain drive, to realize
The morning of inlet and exhaust valve opens or evening closes, and valve-opening time is changed with engine operating condition and is in perfect condition all the time, so as to meet
Optimal distribution demand under Different Work Condition of Engine.
To achieve the above object, the utility model adopts the following technical scheme that：
As shown in figure 1, Timing Belt 110 is driven by engine crankshaft, air inlet belt wheel is driven by Timing Belt 110
120 are rotated with exhaust belt wheel 130, and exhaust belt wheel 130 is fixedly and coaxially connected with exhaust cam shaft 140, by being vented the band of belt wheel 130
Dynamic exhaust cam shaft 140 rotates.Air inlet belt wheel 120 drives admission cam shaft 150 to rotate by variable valve timing apparatus 200,
The variable valve timing apparatus 200 can adjust the phase of admission cam shaft 150, realize valve timing.
As shown in Figure 2 and Figure 3, the variable valve timing apparatus 200 includes housing 210, and the housing 210 is opened for both ends
The hollow cylinder of mouth.Air inlet belt wheel 120 is fixed on one end of housing 210.On the inwall of the housing 210,8 are provided with
Straight-line groove 211, the physical dimension of each straight-line groove 211 are identical.The straight-line groove 211 is along the axis side of housing 210
To extension, straight-line groove 211 runs through the both ends of housing 210, and 8 straight-line grooves 211 are uniformly distributed circumferentially.The straight line
The inner surface of groove 211 is circular arc.
As shown in figure 4, being provided with sleeve 220 in the housing 210, sleeve 220 is coaxially fixed on admission cam shaft 150
Left end, using the assembly method of interference fit when sleeve 220 and admission cam shaft 150 assemble.Set on admission cam shaft 150
The first oil supplying hole 151 and the second oil supplying hole 152 are equipped with, the both ends of the circumferential side wall of the sleeve 220 are respectively arranged with the 3rd confession
The oil supplying hole 222 of oilhole 221 and the 4th, the oil supplying hole 221 of the first oil supplying hole 151 and the 3rd pass through admission cam shaft 150 and set
Oil duct inside cylinder 220 is connected, and the oil supplying hole 222 of the second oil supplying hole 152 and the 4th passes through admission cam shaft 150 and set
Oil duct inside cylinder 220 is connected.
8 curved slots 223 are provided with the outer circumferential wall of the sleeve 220, curved slot 223 runs through sleeve 220
Both ends, curved slot 223 axially extends and circumferentially reverses, and the big I of circumferential angle that it is reversed is according to engine valve
Timing change demand zooms in or out.Preferable as one kind, the circumferential angle that curved slot 223 reverses is 45 °.8 curves
Groove 223 is uniformly distributed circumferentially, and the inner surface of the curved slot 223 is circular arc.
As shown in Fig. 2, Fig. 5, the both ends of the sleeve 220 are respectively arranged with sealing ring 224, two sealing rings 224 it is outer
Side is respectively arranged with back-up ring 225, and sealing ring 224 and the middle part of back-up ring 225 are provided with the through hole for allowing admission cam shaft 150 to pass through,
Keep relatively rotating between sealing ring 224 and back-up ring 225 and admission cam shaft 150 after assembling.First closure 230 and second
Closure 240 covers at the both ends of housing 210 respectively, and is fixed by the end face of screw 231 and housing 210.First is close
The middle part of capping 230 is provided with a through hole, admission cam shaft 150 is therefrom passed.It is close by the first closure 230, second
Capping 240, sealing ring 224 and back-up ring 225, make the oil storage cavity that a sealing is constituted between housing 210 and sleeve 220.
Sealing ring 224 and back-up ring 225 can not only be sealed to cavity inner fluid, and also housing 210 is played a supporting role.
Fig. 6 is referred in the lump, annular steel ball retainer 250 is provided between housing 210 and sleeve 220, in annular steel ball
Uniformly 8 steel balls 251 of assembling, steel ball 251 can be processed with steel ball retainer 250 by hot assembly on the circumference of retainer 250
Into assembling, and the steel ball 251 after assembling can rotate in steel ball retainer 250.8 steel balls 251 respectively with 8 curved slots
223 and 8 straight-line grooves 211 are engaged.1/3 part is assemblied in steel ball retainer 250 among steel ball 251, is protected positioned at steel ball
1/3 part for holding the inner side of frame 250 is bonded completely with the inner surface of curved slot 223,1/3 positioned at the outside of steel ball retainer 250
Divide and be bonded completely with the inner surface of straight-line groove 211.The inner surface of steel ball retainer 250 is bonded with the outer surface of sleeve 220, steel ball
The outer surface of retainer 250 and the inner surface of housing 210 fit.Therefore, by steel ball retainer 250 and steel ball 251, by shell
Oil storage cavity between body 210 and sleeve 220 is divided into two into two separate closed oil pockets, i.e. the 3rd oil supplying hole 221
In the oil pocket of right side, the 4th oil supplying hole 222 is located in the oil pocket of left side.Fluid amount in the oil pocket of left and right two is by the 3rd fuel feeding
The oil supplying hole 222 of hole 221 and the 4th is completed to feed, and is changed by the fluid amount in Engine ECU two oil pockets of control and oil pressure
Become the size of itself oil pocket.
Steel ball retainer 250 is that oil mass and the oil pressure change realization left side in two oil pockets in left and right are controlled by Engine ECU
Right sliding.Initial position makes steel ball retainer 250, and positioned at middle position, remains stationary is motionless, in the oil pocket of left and right two
Oil pressure is equal.When left side oil pocket inner fluid oil mass and oil pressure flow into increase by the second oil supplying hole 152 and the 4th oil supplying hole 222
When, fluid promotes recessed according to the straight-line groove 211 corresponding to steel ball 251 and curve in middle position steel ball retainer 250
The track of groove 223 side slip to the right, the fluid in the oil pocket of right side is promoted to be flowed back to by the 3rd oil supplying hole 221 and the first oil supplying hole 151
Into corresponding accumulator control room.The size of the skidding distance of steel ball retainer 250 is to control two oil in left and right by Engine ECU
What fluid and the oil pressure change of intracavitary were realized.
Oil when being slided for reduction steel ball retainer 250 and its steel ball 251 between the inwall of housing 210 and the outer wall of sleeve 220
Gap flowing effect caused by intracavitary fluid, oil ring and sealing ring etc. can be increased on steel ball retainer 250 and reduce fluid gap
Flow effect.Optimize the size in the 3rd oil supplying hole 221 and the oil duct aperture corresponding to the 4th oil supplying hole 222 simultaneously to meet oil
Buckling demand, steel ball retainer 250 is set to slide caused gap flowing effect negligible relative to the oil mass supply of oil duct
Disregard.
Because straight-line groove 211 corresponding to steel ball 251 and curved slot 223 are into arranged crosswise, on steel ball retainer 250
When steel ball 251 is along straight-line groove 211 and the sliding of curved grooves 223 or so, the intersection position of straight-line groove 211 and curved grooves 223
Put and change constantly, promote to produce relative rotation between housing 210 and sleeve 220.Because housing 210 is with engine charge belt wheel 120
Synchronous axial system, the sliding of steel ball 251 can only make the position relative rectilinear groove 211 of curved grooves 223 change, make sleeve
220 relative housings 210 turn over the circumferential angle that curved slot 223 is slipped over corresponding to steel ball 120.Admission cam shaft 150 is with sleeve
220 turn over identical angle, that is, realize the VVT of engine valve system.
The rotation direction of air inlet belt wheel 120 shown in reference picture 1, to right-hand member under steel ball retainer 250 acts in oil pressure
When mobile, because the structure of steel ball 251 and curved slot 223 limits, opposite direction of the sleeve 220 to be rotated with air inlet belt wheel 120
Turn an angle, the angle slips over circumferential angle corresponding to curved slot 223 equal to steel ball 251.Now admission cam shaft 150
The hysteresis of certain corner, i.e. admission cam phase is lagged relative to air inlet belt wheel 120, air inlet gate delay can be achieved and open and close
Close, improve charging efficiency, provided safeguard for the high rotating speed of engine and high power work section.
When steel ball retainer 250 moves under oil pressure effect to left end, sleeve 220 is to rotate with air inlet belt wheel 120
Equidirectional rotates certain angle.Now admission cam shaft 150 shifts to an earlier date certain corner, i.e. air inlet relative to air inlet belt wheel 120
Cam phase shifts to an earlier date, and inlet valve can be achieved and open and close in advance, promote valve overlap to increase, and then improves exhaust effect
Fruit, help to improve the fuel economy of low engine speeds active section and the torque output of big torque active section.
Real-time speed, engine speed, belt wheel or the sprocket wheel opposing cam that Engine ECU can detect according to different sensors
Corner of axle etc., change steel ball 251 on steel ball retainer 250 by controlling oil mass and the oil pressure change of both sides oil pocket inner fluid
The circumferential angle corresponding to sliding in curved slot 223, adjusts the valve overlap size needed under Different Work Condition of Engine in real time,
Realize continuous variable valve timing.
Variable valve timing apparatus 200 realizes admission cam by controlling the left and right of annular steel ball retainer 250 to slide
The hysteresis of axis cam phase shifts to an earlier date, and its corresponding inlet valve change in displacement timing curve is as shown in Figure 7.
In another embodiment, Timing Belt 110 is replaced by driving-chain, accordingly by air inlet belt wheel 120 and vent strip
Wheel 130 is replaced by sprocket wheel.
Although embodiment of the present utility model is disclosed as above, it is not restricted in specification and embodiment
Listed utilization, it can be applied to various suitable fields of the present utility model completely, for those skilled in the art,
Other modification is easily achieved, therefore under the universal limited without departing substantially from claim and equivalency range, this reality
Specific details is not limited to new and shown here as the legend with description.
Claims (10)
- A kind of 1. variable valve timing apparatus, it is characterised in that including：Housing, cylindrical enclosure cavity is provided with it, it is recessed that the straight line extended in the axial direction is provided with the inner walls Groove；The housing is driven by engine crankshaft to be rotated；Sleeve, it is arranged in housing, the sleeve is fixedly and coaxially connected with admission cam shaft, the sleeve in cylinder The both ends of outer circumferential wall set fuel feed hole respectively, and two fuel feed holes are connected with two oil ducts on admission cam shaft respectively； The sleeve outer circumferential wall upper curve groove, it axially extends and circumferentially reversed；Steel ball retainer, it is in annular, and medial surface and the sleeve lateral surface of the steel ball retainer fit, and the steel ball is protected The medial surface of the lateral surface and housing of holding frame fits；Rotatable steel ball, the steel ball are provided with the steel ball retainer The arc cell wall respectively with straight-line groove and curved slot fits simultaneously.
- 2. variable valve timing apparatus according to claim 1, it is characterised in that one end of the housing be fixedly connected into Gas belt wheel, the air inlet belt wheel are meshed with Timing Belt.
- 3. variable valve timing apparatus according to claim 1, it is characterised in that one end of the housing be fixedly connected into Gas sprocket wheel, the air inlet sprocket wheel are meshed with timing chain.
- 4. the variable valve timing apparatus according to Claims 2 or 3, it is characterised in thatThe straight-line groove is provided with 8, is circumferentially evenly arranged；The curved slot is provided with 8, is circumferentially evenly arranged；Steel ball on the steel ball retainer is provided with 8, is circumferentially evenly arranged.
- 5. variable valve timing apparatus according to claim 4, it is characterised in that the curved slot circumferentially reverses 45°。
- 6. variable valve timing apparatus according to claim 1, it is characterised in that the both ends of the sleeve are respectively arranged with Sealing ring, the sealing ring outside are provided with back-up ring.
- 7. variable valve timing apparatus according to claim 1, it is characterised in that the sleeve uses with admission cam shaft Interference fit is fixed.
- 8. variable valve timing apparatus according to claim 1, it is characterised in that the housing includes body and both ends can The closure of dismounting, the closure are fixed by screws in enclosure body.
- 9. variable valve timing apparatus according to claim 1, it is characterised in that the steel ball passes through with steel ball retainer Hot assembly forms.
- 10. variable valve timing apparatus according to claim 1, it is characterised in that the admission cam shaft is from housing One end passes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720405889.0U CN206625877U (en) | 2017-04-18 | 2017-04-18 | A kind of variable valve timing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720405889.0U CN206625877U (en) | 2017-04-18 | 2017-04-18 | A kind of variable valve timing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206625877U true CN206625877U (en) | 2017-11-10 |
Family
ID=60205187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720405889.0U Expired - Fee Related CN206625877U (en) | 2017-04-18 | 2017-04-18 | A kind of variable valve timing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206625877U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131022A (en) * | 2017-04-18 | 2017-09-05 | 辽宁工业大学 | A kind of variable valve timing apparatus |
-
2017
- 2017-04-18 CN CN201720405889.0U patent/CN206625877U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131022A (en) * | 2017-04-18 | 2017-09-05 | 辽宁工业大学 | A kind of variable valve timing apparatus |
| CN107131022B (en) * | 2017-04-18 | 2023-12-22 | 辽宁工业大学 | Variable valve timing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171110 Termination date: 20180418 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |