CN218844407U - Hydraulic drive type variable valve device and engine - Google Patents
Hydraulic drive type variable valve device and engine Download PDFInfo
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- CN218844407U CN218844407U CN202223596323.0U CN202223596323U CN218844407U CN 218844407 U CN218844407 U CN 218844407U CN 202223596323 U CN202223596323 U CN 202223596323U CN 218844407 U CN218844407 U CN 218844407U
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- 238000007789 sealing Methods 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 29
- 238000010586 diagram Methods 0.000 description 3
- 239000010721 machine oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model discloses a hydraulic drive type variable valve device and an engine, wherein the variable valve device comprises a camshaft, a sliding sleeve and a valve, an upper plunger and a lower plunger are arranged in the sliding sleeve, a hydraulic cavity is arranged between the upper plunger and the lower plunger, the inner side end part of the upper plunger is provided with an upward convex structure protruding towards the hydraulic cavity, and/or the inner side end part of the lower plunger is provided with a downward convex structure protruding towards the hydraulic cavity; the distance H between the upper convex structure and the lower convex structure, or the distance H between the upper convex structure and the inner side end of the lower plunger, or the distance H between the inner side end of the upper plunger and the lower convex structure is the difference between the maximum lift A and the minimum lift B of the variable valve. Therefore, when the engine is started without engine oil in the hydraulic cavity, the upper convex structure and the lower convex structure, the upper convex structure and the lower plunger piston or the upper plunger piston and the lower convex structure are in rigid connection, and the valve has a certain opening degree, so that air intake is realized, and the starting requirement of the engine is met.
Description
Technical Field
The utility model relates to a variable valve technical field especially relates to a variable valve gear of hydraulic drive formula and engine.
Background
The hydraulic drive type variable valve lift principle is shown in a figure 1 of a utility model with the publication number of CN109339896A and the name of a fully variable electro-hydraulic valve device, wherein the disclosed valve device comprises a camshaft, an upper plunger and a lower plunger, the camshaft drives the upper plunger, the lower plunger abuts against a valve, and a hydraulic cavity is arranged between the upper plunger and the lower plunger. The hydraulic cavity is filled with engine oil, the camshaft drives the upper plunger to move downwards, and the engine oil in the hydraulic cavity transmits the force of the upper plunger to the lower plunger to push the valve to open; the variable valve lift is realized by controlling the oil quantity of the hydraulic cavity.
The hydraulic cavity utilizes engine oil, and when the engine is started, the hydraulic cavity has two conditions: one without oil and the other with a portion of oil. When the hydraulic cavity is free of engine oil, when the engine is started, the camshaft rotates to apply force to the upper plunger, air is in the hydraulic cavity and is compressed, the lower plunger cannot be pushed to move downwards to open the valve, and then the engine cannot be started, as shown in fig. 2. When a part of engine oil exists in the hydraulic cavity, the valve lift is inconsistent and uncontrollable due to uncertain oil quantity, especially the fact that the oil quantity of each cylinder of the multi-cylinder engine cannot be kept the same.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough, the utility model discloses the technical problem that will solve is: provided are a hydraulically driven variable valve device and an engine, which can solve the problem of cold start.
In order to solve the technical problem, the technical scheme of the utility model is that:
a hydraulic drive type variable valve device comprises a camshaft, a sliding sleeve and a valve, wherein an upper plunger and a lower plunger which are respectively connected with the sliding sleeve in a sliding and sealing mode are arranged in the sliding sleeve, the upper plunger is controlled by the camshaft in the axial direction, the outer side end of the lower plunger abuts against the valve, a hydraulic cavity is formed between the upper plunger and the lower plunger, an upper convex structure protruding towards the hydraulic cavity is arranged at the inner side end of the upper plunger, and/or a lower convex structure protruding towards the hydraulic cavity is arranged at the inner side end of the lower plunger; the distance H between the upper convex structure and the lower convex structure is the difference between the maximum lift A and the minimum lift B of the variable valve; or the distance H between the upper convex structure and the inner side end part of the lower plunger is the difference between the maximum lift A and the minimum lift B of the variable valve; or the distance between the inner side end of the upper plunger and the lower convex structure is H, which is the difference between the maximum lift A and the minimum lift B of the variable valve.
Preferably, the sliding sleeve is provided with an oil inlet and an oil drainage port respectively, the oil inlet is communicated with the hydraulic cavity, and the lower plunger is provided with a spiral oil groove; and when the valve lift is set to be the minimum lift B, the spiral oil groove is communicated with the oil drainage port.
Preferably, the upper protruding structure is an upper boss, and the upper boss is arranged in the middle of the end part of the inner side of the upper plunger.
Preferably, the lower convex structure is a lower boss, and the lower boss is arranged in the middle of the end part of the inner side of the lower plunger.
An engine includes the above hydraulically driven variable valve device.
Preferably, the engine further comprises an air inlet pipeline, and an electric supercharger is arranged on the air inlet pipeline; the electric supercharger is used for increasing the air inflow of the air inlet pipeline.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
because the utility model discloses a variable valve gear of hydraulic drive formula and engine, wherein variable valve gear includes camshaft, sliding sleeve and valve, be provided with respectively rather than sliding seal connection's upper plunger and lower plunger in the sliding sleeve, the upper plunger is controlled by the camshaft in the axial, the outside end top of lower plunger leans on the valve, be the hydraulic pressure chamber between upper plunger and the lower plunger, the inboard tip of upper plunger is provided with the protruding epirelief structure of directional hydraulic pressure chamber, and/or, the inboard tip of lower plunger is provided with the protruding epirelief structure of directional hydraulic pressure chamber; the distance H between the upper convex structure and the lower convex structure is the difference between the maximum lift A and the minimum lift B of the variable valve; or the distance H between the upper convex structure and the inner side end part of the lower plunger is the difference between the maximum lift A and the minimum lift B of the variable valve; or the distance between the inner side end of the upper plunger and the lower convex structure is H, which is the difference between the maximum lift A and the minimum lift B of the variable valve. Therefore, when the engine is not started in the hydraulic cavity, the upper convex structure and the lower convex structure, the upper convex structure and the lower plunger or the upper plunger and the lower convex structure are in rigid connection, so that the valve has a certain opening degree, air inlet is realized, and the problem of variable valve lift cold start is solved; thereby meeting the starting requirement of the engine.
An oil inlet and an oil drainage port are respectively formed in the sliding sleeve, the oil inlet is communicated with the hydraulic cavity, and a spiral oil groove is formed in the lower plunger; when the valve lift is set to be the minimum lift B, the spiral oil groove is communicated with the oil drainage port, so that when the valve lift reaches the minimum lift, the valve lift is not increased any more, and the consistency of the valve lift is kept.
The engine also comprises an air inlet pipeline, and an electric supercharger is arranged on the air inlet pipeline; the electric supercharger is used for increasing the air inflow of the air inlet pipeline, when the minimum lift of the valve is too small and the air inflow required by the starting of the engine cannot be met, the electric supercharger can be started to boost the air inflow, and the air inflow is increased so as to meet the starting requirement of the engine.
To sum up, the utility model solves the technical problem that the engine can not be started normally because the valve can not be opened when no engine oil is in the hydraulic cavity of the variable valve device in the prior art; the utility model discloses a set up the boss on last plunger and lower plunger, when making the hydraulic pressure intracavity not have machine oil, can keep the valve to have certain aperture B to the admission line admits air, and then satisfies the engine start demand, and simple structure, easy realization.
Drawings
FIG. 1 is a schematic diagram of a fully variable electro-hydraulic valve train of the prior art;
FIG. 2 is a schematic structural diagram of a fully variable electro-hydraulic valve device in the prior art when no oil exists in a hydraulic chamber;
fig. 3 is a schematic structural view of a hydraulically driven variable valve device according to the present invention;
FIG. 4 is a schematic structural diagram of the hydraulic chamber of the present invention without mineral oil;
in the figure: 1-camshaft, 2-upper plunger, 20-upper convex structure, 3-lower plunger, 30-lower convex structure, 4-sliding sleeve, 5-hydraulic cavity, 6-valve, 7-air inlet pipeline, 8-electric supercharger, 90-oil inlet, 91-spiral oil groove and 92-oil drain.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 3 and 4, a hydraulically driven variable valve device includes a camshaft 1, a sliding sleeve 4 and a valve 6, an upper plunger 2 and a lower plunger 3 which are respectively connected with the sliding sleeve 4 in a sliding and sealing manner are arranged in the sliding sleeve 4, the upper plunger 2 is controlled by the camshaft 1 in the axial direction, the outer side end of the lower plunger 3 abuts against the valve 6, a hydraulic pressure chamber 5 is arranged between the upper plunger 2 and the lower plunger 3, an upper convex structure 20 which protrudes towards the hydraulic pressure chamber 5 is arranged at the inner side end of the upper plunger 2, and/or a lower convex structure 30 which protrudes towards the hydraulic pressure chamber 5 is arranged at the inner side end of the lower plunger 3. In addition, the inner side end and the outer side end are both based on the sliding sleeve 4, the end located inside the sliding sleeve 4 is the inner side end, and the end located outside the sliding sleeve 4 is the outer side top.
It should be noted that the present invention has the following three modes: the first method comprises the following steps: the upper convex structure 20 is arranged at the inner end part of the upper plunger 2, and the distance H between the upper convex structure 20 and the inner end part of the lower plunger 3 is the difference between the maximum lift A and the minimum lift B of the variable valve. And the second method comprises the following steps: the lower plunger 3 is provided with the lower protrusion 30 only at the inner end thereof, and the distance H between the lower protrusion 30 and the inner end of the upper plunger 2 is set to be the difference between the maximum lift a and the minimum lift B of the variable valve. And the third is that: the inner side end of the upper plunger 2 is provided with an upper convex structure 20, the inner side end of the lower plunger 3 is provided with a lower convex structure 30, and the distance H between the upper convex structure 20 and the lower convex structure 30 is set to be the difference between the maximum lift A and the minimum lift B of the variable valve. Additionally all H, A and B above are used to represent numerical values.
As shown in fig. 4, when the engine is started without engine oil in the hydraulic chamber 5, rigid connection is formed between the upper convex structure 20 and the lower convex structure 30, between the upper convex structure 20 and the lower plunger 3, or between the upper plunger 2 and the lower convex structure 30, so that the valve 6 has a certain opening B, and the air can be conveniently supplied to the air inlet pipe 7, thereby solving the problem of cold start of the variable valve lift and further meeting the starting requirement of the engine.
In this embodiment, the upper convex structure 20 may be configured as an upper boss, and the upper boss is disposed in the middle of the end portion of the inner side of the upper plunger 2; meanwhile, the lower convex structure 30 may be provided as a lower boss provided in the middle of the end of the inner side of the lower plunger 3; by adopting the structure, the consistency of the valve lift can be improved.
As shown in fig. 4, the sliding sleeve 4 is provided with an oil inlet 90 and an oil drain port 92, respectively, the oil inlet 90 is communicated with the hydraulic cavity 5, and the lower plunger 3 is provided with a spiral oil groove 91; when the valve lift is set to the minimum lift B, the spiral oil groove 91 communicates with the drain port 92.
Through rational design spiral oil groove 91 and draining port 92 distance, when hydraulic pressure chamber 5 had some machine oil to start, the spiral oil groove 91 and the draining port 92 distance of plunger 3 under the design, when making the valve lift reach minimum lift B, draining port 92 and spiral oil groove 91 switch-on pressure release, the valve lift no longer continues to increase, keeps valve lift uniformity.
The utility model provides an engine, including the above-mentioned hydraulic drive formula variable valve device, still include the admission line 7, is provided with the electronic booster 8 on the admission line 7; the electric supercharger 8 is used to increase the intake air amount of the intake pipe 7.
When the minimum valve lift B is too small to meet the air inflow required by the engine starting, the electric supercharger 8 can be started to supercharge the intake air, and the air inflow is increased to meet the engine starting requirement.
The above is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications made within the spirit and principle of the present invention, equivalent to the modification of the hydraulically driven variable valve device and the engine, should be included in the scope of the present invention.
Claims (6)
1. A hydraulic drive type variable valve device comprises a camshaft, a sliding sleeve and a valve, wherein an upper plunger and a lower plunger which are respectively connected with the sliding sleeve in a sliding and sealing mode are arranged in the sliding sleeve, the upper plunger is controlled by the camshaft in the axial direction, the outer side end of the lower plunger abuts against the valve, and a hydraulic cavity is arranged between the upper plunger and the lower plunger;
the distance H between the upper convex structure and the lower convex structure is the difference between the maximum lift A and the minimum lift B of the variable valve; or the like, or a combination thereof,
the distance H between the upper convex structure and the inner side end part of the lower plunger is the difference between the maximum lift A and the minimum lift B of the variable valve; or the like, or, alternatively,
the distance between the inner side end of the upper plunger and the lower convex structure is H, and is the difference between the maximum lift A and the minimum lift B of the variable valve.
2. The hydraulically driven variable valve apparatus according to claim 1, wherein an oil inlet and an oil drain are provided on the sliding sleeve, respectively, the oil inlet communicating with the hydraulic chamber, and the lower plunger is provided with a helical oil groove;
and when the valve lift is set to be the minimum lift B, the spiral oil groove is communicated with the oil drainage port.
3. The hydraulically driven variable valve apparatus according to claim 1, wherein the upward projection structure is an upper boss provided in the middle of the inner end of the upper plunger.
4. The hydraulically-driven variable valve apparatus according to claim 1, wherein the lower projection structure is a lower boss provided in the middle of an inner end of the lower plunger.
5. An engine characterized by comprising the hydraulically driven variable valve apparatus according to any one of claims 1 to 4.
6. The engine of claim 5, further comprising an intake conduit having an electrically powered supercharger disposed thereon; the electric supercharger is used for increasing the air inflow of the air inlet pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223596323.0U CN218844407U (en) | 2022-12-28 | 2022-12-28 | Hydraulic drive type variable valve device and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223596323.0U CN218844407U (en) | 2022-12-28 | 2022-12-28 | Hydraulic drive type variable valve device and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218844407U true CN218844407U (en) | 2023-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223596323.0U Active CN218844407U (en) | 2022-12-28 | 2022-12-28 | Hydraulic drive type variable valve device and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218844407U (en) |
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2022
- 2022-12-28 CN CN202223596323.0U patent/CN218844407U/en active Active
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