CN104603407B - The linear motion-type valve tappet of internal-combustion engine - Google Patents
The linear motion-type valve tappet of internal-combustion engine Download PDFInfo
- Publication number
- CN104603407B CN104603407B CN201280075528.4A CN201280075528A CN104603407B CN 104603407 B CN104603407 B CN 104603407B CN 201280075528 A CN201280075528 A CN 201280075528A CN 104603407 B CN104603407 B CN 104603407B
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- Prior art keywords
- cam
- tappet
- low
- sliding contact
- valve tappet
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- Expired - Fee Related
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 description 10
- 230000000630 rising effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead camshafts
-
- 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
- F01L1/053—Camshafts overhead type
- F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
-
- 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
- F01L2307/00—Preventing the rotation of tappets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Transmission Devices (AREA)
Abstract
A kind of linear motion-type valve tappet of internal-combustion engine, the valve tappet of belt variable lifting mechanism is required to make certain direction relative to cam member, but does not realize it by easy structure with relying on the method for chimeric such unnecessary processing of needs pod in the past and pin.The cam slide surface of contact high raising cam, low raising cam being carried out the valve tappet of sliding contact is formed as smooth plane of inclination, make the cam slide in this sliding contact surface contact beginning place lower than cam slide contact end place, between two places, rational height is poor.Thus, because high raising cam and low raising cam all always from low cam slide contacts place towards high cam slide contact terminate place, along the side wedge cam sliding contact surface high from a low direction that tilt, so valve tappet does not accept the power around to-and-fro motion axis from cam.Therefore the direction of valve tappet becomes certain.
Description
Technical field
The present invention relates to the columnar linear motion-type valve tappet of the active valve mechanism forming internal-combustion engine.Wherein the present invention is the valve tappet of belt variable lifting mechanism as object.
The valve tappet of this form, carry out action with switching the high tappet portion with high raising cam sliding contact surface and the low tappet portion with low raising cam sliding contact surface by have carried out integrated cam member relative to high raising cam and low raising cam, becoming can the structure of ascending amount (valve opening amount) of height two-stage ground regulating valve.Usually, when high ascending amount, be high rotation, efficiency is good, and when low rotation, efficiency reduces; When low ascending amount, be low rotation, efficiency is good, and when height rotates, efficiency reduces.Therefore, be rotate territory and low rotation territory accordingly the ascending amount of valve to be switched to the high ascending amount of high sense of rotation and the low ascending amount of low sense of rotation with the height of internal-combustion engine.
Background technique
The valve tappet of the belt variable lifting mechanism of such structure is required to make certain direction relative to cam member.
One of its reason is the collision preventing cam and valve tappet.If valve tappet rotates around to-and-fro motion axis, direction changes, then high tappet portion offsets from fixed position, and when being operated by low raising cam, high raising cam will come off from high tappet portion and collide with low tappet portion fierceness and destroy.
Two of reason prevents the position of oily feed path from offseting.Under this form, the cam changeover mechanism of operating valve tappet is carried out from engine side supply oil pressure, if but valve tappet rotates, its direction is facing to different directions, the then position skew of the oily supplying mouth of engine side and the oily receiving port of valve tappet side, the supply of oil supply brings obstacle, and cam changeover mechanism becomes normally can not carry out action.
Because these reasons, so valve tappet makes certain direction relative to cam member, namely require the directivity of valve tappet, but be by taking spline assembly to realize it on valve tappet in the past.
Such as in Figure 14 (Fig. 1 of patent documentation 1), make pin 102 outstanding to the side of valve tappet 101, its pod 104 with the inner circumferential being formed in cylinder bore (cylinderbore) 103 is engaged.This pin 101 and pod 104 are spline assemblies of valve tappet 101.
105 of Figure 14 is the center tappets being carried out forward-reverse by the oil pressure of oil circuit 106, and when being in the going-back position shown in Figure 14, high rising center cams 108 becomes empty by slit 107 and beats, low raising cam 109 and low tappet portion 110 sliding contact.Its result, valve 111 carries out opening and closing with low ascending amount.On the other hand, if center tappet 105 debouches slit 107 and is in progressive position, then the outer circumferential face sliding contact of high raising cam 108 and center tappet 105, valve 110 carries out opening and closing with high ascending amount.
In the valve tappet of such belt variable lifting mechanism, even if contrary with Figure 14, pin 102 is arranged on internal side diameter, pod 104 is arranged on valve tappet side, also with the example of Figure 14 with imitating, no matter in which example, all realized the spline of valve tappet along pod by pin.
At first technical paper
Patent documentation
Patent documentation 1: Japan Patent No. 4829562 publications
Summary of the invention
Invent problem to be solved
Spline assembly in the past like this, because the processing needing the formation of pod, the installation of pin etc. unnecessary, so not only manufacture numerous and diverse, structure is also complicated, can not avoid the decline of wearing and tearing, durability, also becomes the reason of the undesirable condition producing abnormal sound etc.
Problem to be solved by this invention is, the structure of complexity how need not be such realizes the directivity of the valve tappet of belt variable lifting mechanism.
In order to solve the means of problem
In the present invention, it is a kind of valve tappet of belt variable lifting mechanism, its cam slide surface of contact high raising cam above this valve tappet, low raising cam being carried out the valve tappet of sliding contact is formed as smooth plane of inclination, make the cam slide in this sliding contact surface contact beginning place lower than cam slide contact end place, between two places, rational height is poor.
The effect of invention
In the present invention, high raising cam and low raising cam all always from low cam slide contacts place terminate place, along the side wedge cam sliding contact surface high from a low direction of tilting towards the contact of high cam slide.Its result, because the sliding contact track of the cam in cam slide surface of contact is along the true dip direction of cam slide surface of contact, so valve tappet does not accept the power around to-and-fro motion axis from cam.Therefore the direction of valve tappet becomes certain.
Like this, according to the present invention, due to different from spline assembly in the past, spline can be realized, so number of spare parts can be cut down and can lightweight, in addition by the simple structure of the machining cam sliding contact surface that only tilts, because do not need the processing in cylinder bore side to rotate the pod etc. prevented, so can processing charges be reduced, and then, play following excellent effect: assemble also simple, easy to manufacture, wearing and tearing, do not produce the danger of abnormal sound, and reliability improves.
Accompanying drawing explanation
Fig. 1 implements the sectional view around internal-combustion engine linear motion-type valve tappet of the present invention.
The internal mechanism explanatory drawing of the valve tappet of Fig. 1 when Fig. 2 is low rising.
Fig. 3 is the action specification figure around the valve tappet of Fig. 2.
The internal mechanism explanatory drawing of the valve tappet of Fig. 1 when Fig. 4 is high rising.
Fig. 5 is the action specification figure around the valve tappet of Fig. 4.
Fig. 6 is the Action Specification figure of the sense of rotation of valve tappet for illustration of Fig. 1, represents the state from front viewing valve tappet.
Fig. 7 is the Action Specification figure of the sense of rotation of valve tappet for illustration of Fig. 1, represents the state seen from plane.
Fig. 8 is the Action Specification figure of the sense of rotation of valve tappet for illustration of Fig. 1, represents the state seen from plane.
Fig. 9 is the sectional view of the various cam slide surface of contact implementing valve tappet of the present invention, represents the example of cam slide surface of contact projection.
Figure 10 is the sectional view of the various cam slide surface of contact implementing valve tappet of the present invention, represents inverse protruding example.
Figure 11 is the sectional view of the various cam slide surface of contact implementing valve tappet of the present invention, the example of the plane having represented to tilt.
Figure 12 is the stereogram of the different example implementing valve tappet of the present invention.
Figure 13 is the stereogram of the different example implementing valve tappet of the present invention.
Figure 14 is the sectional view around the valve tappet of past case.
Embodiment
In order to the mode carried out an invention
In FIG, 11 is cylinder heads of engine for automobile, and 12 represent suction ports.13 is Aspirating valvess, and 14 is valve rods, and 15 is valve tappets of belt variable lifting mechanism, and 16 is cams.Wherein 16a is high raising cam, and 16b represents low raising cam.They have been carried out blocking by being arranged on integratedly on common camshaft 17.
18 is cylinder bores, is shifted onto on suction port 12 by Aspirating valves 13 and close by the helical spring 19 inside it.Cam 16 (16a or 16b) makes valve tappet 15 revolt helical spring 19 and push away to Figure below, opens Aspirating valves 13.20 is cam slide surface of contact of valve tappet 15, and cam 16 carries out sliding contact at this and pushes away valve tappet 15, opens Aspirating valves 13.Repeatedly carry out this action, valve tappet 15 carries out straight reciprocating motion in cylinder bore 18.
On the cam slide surface of contact 20 of valve tappet 15, be equipped with the high tappet portion 15a with high raising cam sliding contact surface 20a and low tappet portion 15b, 15b (Fig. 2 ~ Fig. 5) with low raising cam sliding contact surface 20b, 20b.They are configured to low tappet portion 15b, 15b and clip high tappet portion 15a from left and right, if moved by oil pressure at the oil pressure pin 21 of lateral direction penetrating height tappet portion 15a, then low tappet portion 15b (Fig. 4) is inserted in front end, low tappet portion 15b, 15b integration (Fig. 5) of high tappet portion 15a and left and right.If oil pressure pin 21 is extracted (Fig. 2) from low tappet portion 15b, then high tappet portion 15a and low tappet portion 15b is separated, and high tappet portion 15a is freely elevated (Fig. 3) relative to low tappet portion 15b.
As shown thus, under the state of Fig. 3, even if high raising cam 16a contacts with high raising cam sliding contact surface 20a, also do not push away valve tappet 15 down, become so-called sky and beat state.Its result, low raising cam 16b contact with low raising cam sliding contact surface 20b and under push away low tappet portion 15b, valve tappet 15 becomes the action of low ascending amount.On the other hand, under the state of Fig. 5, high tappet portion 15a is integrated with low tappet portion 15b, high raising cam 16a contact with high raising cam sliding contact surface 20a and under push away valve tappet 15.Its result, valve tappet 15 becomes the action of high ascending amount.
In figure, 22 is oily receiving ports of oil pressure, 23 is the action pin pushing away oil pressure pin 21, and 24 is the Returnning springs making high tappet portion 20a return primary position (high raising cam sliding contact surface 20a and low raising cam sliding contact surface 20b is positioned in identical level side by side).
But cam slide surface of contact 20 (high raising cam sliding contact surface 20a and/or person's low raising cam sliding contact surface 20b) of the present invention is in smooth plane of inclination.
Therefore, as shown in Figure 6, the initial high position H with having departed from from the center of cam slide surface of contact 20 of cam 16 (high raising cam 16a or low raising cam 16b) carries out point cantact.If this position is started place A as cam slide contact, then cam 16 rotates sliding contact on the face of cam slide surface of contact 20 along with it while terminate place B in cam slide contact to leave cam slide surface of contact 20 (Fig. 7).The center of cam slide the surface of contact 20 because line segment of tie point A and B has come off, so valve tappet 15 rotates to from an A towards the direction of arrow (clockwise direction) of the direction of a B i.e. Fig. 7 because of the surface friction drag of cam 16.In other words, valve tappet 15 accepts clockwise rotating force from cam 16.If valve tappet 15 rotates, cam slide contact starts the low position L that place A arrives cam slide surface of contact 20, surface friction drag then from an A towards the cam 16 of a B is orthogonal with the center line of valve tappet 15, and the rotating force of valve tappet 15 is lost, and the rotation of valve tappet 15 stops.
This situation is also same when cam 16 rotates in the opposite direction.
Rotating to be in reciprocal situation, cam slide contact starts the some B that place becomes Fig. 8, and cam slide contact terminates place and becomes an A.The surface friction drag of cam 16 now acts on the direction from a B towards an A, and thus, valve tappet 15 rotates to the direction of arrow (counterclockwise) of Fig. 8.Its result, if cam slide contact starts the low position L that place B arrives cam slide surface of contact 20, then the rotating force of valve tappet 15 is lost, and the rotation of valve tappet 15 stops.
As shown by these, according to the present invention, because cam slide surface of contact 20 is in plane of inclination, so cam slide contacts the sense of rotation starting place and cam 16, it doesn't matter, be stabilized in the low position L of cam slide surface of contact 20, the rotation of valve tappet 15 stops.
The plane of inclination of cam slide surface of contact 20 is not limited to plane (Figure 11).Both can be protruding (Fig. 9) also can be inverse protruding (Figure 10).In a word, as long as it is lower than cam slide contact end place to make cam slide contact beginning place, between two places, there is height difference.
In the example of the projection of Fig. 9, be partly horizontal plane 25 from center the first from left, right half is formed descending grade face 26.Horizontal plane 25 is connected by mild curved surface continuously with the boundary in descending grade face 26, the projection that cam slide surface of contact entirety is high in having made.Therefore, finally, the cam slide that cam 16 starts to contact with cam slide surface of contact 20 contacts and starts place A, is stabilized in the cam slide contact left from cam slide surface of contact 20 than cam 16 and terminates the low position of place B.
Figure 10 is following example: cam slide surface of contact 20 is protruding too, but, be inverse protruding.That is, cam slide surface of contact 20, be partly descending grade face 27 from center the first from left, right half is formed horizontal plane 28.Descending grade face 27 is connected by mild curved surface continuously with the boundary of horizontal plane 28, and the entirety of cam slide surface of contact 20 defines the low inverse projection of central authorities.
Even if in inverse protruding example, cam slide contact starts place and is also terminating the low position stability in place than cam slide contact.
The height difference in two places, when valve tappet is external diameter 30mm, subsistence level more than 15 μm, preferably more than 30 μm.Computationally, average slope is minimum is
(0.015/30) × more than 100=0.05%.
By the way, there is following structure in the valve tappet of belt variable lifting mechanism: the high tappet portion with high raising cam sliding contact surface is different with the configuration in the low tappet portion with low raising cam sliding contact surface.
Figure 12 is the example being configured with low tappet portion 30 in the inner side in the high tappet portion 29 of ring-type, and Figure 13 is the example being configured with the low tappet portion 32,32 of arc-shaped in the left and right in rectangular high tappet portion 31.Cam slide surface of contact of the present invention, also comprises any one example in these examples.
The present invention can be used in the valve tappet of the belt variable lifting mechanism enclosed in the internal-combustion engine of automobile, industrial vehicle etc. widely.
The explanation of symbol:
11: cylinder head, 12: suction port, 13: Aspirating valves, 14: valve rod, 15: valve tappet, 16: cam, 18: cylinder bore, 19: helical spring, 20: cam slide surface of contact, A: cam slide contact starts place, B: cam slide contact terminates place.
Claims (4)
1. the valve tappet of an internal-combustion engine, it is the columnar linear motion-type valve tappet of belt variable lifting mechanism, it switchably possesses high tappet portion and low tappet portion, this high tappet portion has the high raising cam sliding contact surface that high raising cam carries out sliding contact, this low tappet portion has the low raising cam sliding contact surface that low raising cam carries out sliding contact, it is characterized in that
On on this valve tappet, form above-mentioned high raising cam sliding contact surface and low raising cam sliding contact surface with valve tappet, and which cam slide surface of contact all makes smooth plane of inclination,
In addition, this plane of inclination is the plane relative to the planar tilt orthogonal with valve tappet vibration-direction, and the cam slide contact on this cam slide surface of contact starts place, and to terminate place than cam slide contact low.
2. the valve tappet of an internal-combustion engine, it is the columnar linear motion-type valve tappet of belt variable lifting mechanism, it switchably possesses high tappet portion and low tappet portion, this high tappet portion has the high raising cam sliding contact surface that high raising cam carries out sliding contact, this low tappet portion has the low raising cam sliding contact surface that low raising cam carries out sliding contact, it is characterized in that
On on this valve tappet, form above-mentioned high raising cam sliding contact surface and low raising cam sliding contact surface with valve tappet, and which cam slide surface of contact all makes smooth plane of inclination,
In addition, this plane of inclination is processed to projection, and it is lower than cam slide contact end place that the cam slide contact on this cam slide surface of contact starts place.
3. the valve tappet of an internal-combustion engine, it is the columnar linear motion-type valve tappet of belt variable lifting mechanism, it switchably possesses high tappet portion and low tappet portion, this high tappet portion has the high raising cam sliding contact surface that high raising cam carries out sliding contact, this low tappet portion has the low raising cam sliding contact surface that low raising cam carries out sliding contact, it is characterized in that
On on this valve tappet, form above-mentioned high raising cam sliding contact surface and low raising cam sliding contact surface with valve tappet, and which cam slide surface of contact all makes smooth plane of inclination,
In addition, this plane of inclination is processed to against protruding, and it is lower than cam slide contact end place that the cam slide contact on this cam slide surface of contact starts place.
4. as the valve tappet of the internal-combustion engine of any one record in claims 1 to 3, it is characterized in that, be arranged on the oil pressure pin in the above-mentioned high tappet portion of lateral direction penetrating, this oil pressure pin is moved by oil pressure, the front end of oil pressure pin is inserted low tappet portion and by high tappet portion and low tappet integrally, or the front end of oil pressure pin extracted from low tappet portion and high tappet portion and low tappet portion are separated, switching high tappet portion and low tappet portion.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/072158 WO2014033910A1 (en) | 2012-08-31 | 2012-08-31 | Direct-action valve lifter for internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
CN104603407A CN104603407A (en) | 2015-05-06 |
CN104603407B true CN104603407B (en) | 2016-04-20 |
Family
ID=50182757
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201280075528.4A Expired - Fee Related CN104603407B (en) | 2012-08-31 | 2012-08-31 | The linear motion-type valve tappet of internal-combustion engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2891774A4 (en) |
JP (1) | JP5817040B2 (en) |
KR (1) | KR101528274B1 (en) |
CN (1) | CN104603407B (en) |
WO (1) | WO2014033910A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9657606B2 (en) | 2015-02-25 | 2017-05-23 | Nittan Valve Co., Ltd. | Direct-acting valve lifter of internal combustion engine |
USRE47823E1 (en) * | 2012-08-31 | 2020-01-21 | Nittan Valve Co., Ltd. | Direct-acting valve lifter of internal combustion engine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5654204U (en) * | 1979-09-28 | 1981-05-12 | ||
JPH0617610A (en) * | 1992-07-03 | 1994-01-25 | Toyota Motor Corp | Valve system of internal combustion engine |
JPH11229837A (en) * | 1998-02-13 | 1999-08-24 | Unisia Jecs Corp | Variable valve gear of internal combustion engine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8431407D0 (en) * | 1984-12-12 | 1985-01-23 | Stidworthy F M | Variable valves |
JP3785634B2 (en) * | 2000-08-11 | 2006-06-14 | マツダ株式会社 | Engine valve gear |
DE10135175A1 (en) * | 2001-07-19 | 2003-02-06 | Ina Schaeffler Kg | Switchable bucket tappet |
JP4829562B2 (en) | 2005-08-01 | 2011-12-07 | 日鍛バルブ株式会社 | Direct acting valve lifter for internal combustion engine |
JP2008133770A (en) * | 2006-11-28 | 2008-06-12 | Toyota Motor Corp | Variable valve gear |
KR101090798B1 (en) * | 2009-06-04 | 2011-12-08 | 현대자동차주식회사 | Variable tappet |
-
2012
- 2012-08-31 KR KR1020157006536A patent/KR101528274B1/en active IP Right Grant
- 2012-08-31 EP EP12883659.0A patent/EP2891774A4/en not_active Withdrawn
- 2012-08-31 JP JP2014532678A patent/JP5817040B2/en not_active Expired - Fee Related
- 2012-08-31 WO PCT/JP2012/072158 patent/WO2014033910A1/en active Application Filing
- 2012-08-31 CN CN201280075528.4A patent/CN104603407B/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5654204U (en) * | 1979-09-28 | 1981-05-12 | ||
JPH0617610A (en) * | 1992-07-03 | 1994-01-25 | Toyota Motor Corp | Valve system of internal combustion engine |
JPH11229837A (en) * | 1998-02-13 | 1999-08-24 | Unisia Jecs Corp | Variable valve gear of internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
WO2014033910A1 (en) | 2014-03-06 |
EP2891774A1 (en) | 2015-07-08 |
CN104603407A (en) | 2015-05-06 |
JP5817040B2 (en) | 2015-11-18 |
JPWO2014033910A1 (en) | 2016-08-08 |
EP2891774A4 (en) | 2016-07-20 |
KR20150038655A (en) | 2015-04-08 |
KR101528274B1 (en) | 2015-06-11 |
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