CN111472859B - Hydraulic tappet - Google Patents
Hydraulic tappet Download PDFInfo
- Publication number
- CN111472859B CN111472859B CN202010460474.XA CN202010460474A CN111472859B CN 111472859 B CN111472859 B CN 111472859B CN 202010460474 A CN202010460474 A CN 202010460474A CN 111472859 B CN111472859 B CN 111472859B
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- China
- Prior art keywords
- pressure relief
- valve
- spring
- hydraulic
- tappet body
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- 239000003921 oil Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 239000010705 motor oil Substances 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a hydraulic tappet, comprising: one end of the tappet body is provided with an oil inlet, the other end of the tappet body is open, a plunger piston of the tappet body extends into the tappet body from the open end and forms a hydraulic cavity with the tappet body, a one-way valve which can communicate an engine oil way with the hydraulic cavity under the action of engine oil pressure is arranged at the inner side of the oil inlet, and a return spring is arranged in the hydraulic cavity; the outer peripheral surface of the plunger piston is in sliding sealing fit with the inner peripheral surface of the tappet body, a pressure relief channel communicated with the hydraulic cavity is formed in the plunger piston, a pressure relief valve core and a pressure relief spring are arranged in the pressure relief channel, the pressure relief valve core is propped away from the sealing conical surface by the pressure relief spring to form an oil leakage gap when the pressure relief valve core is not affected by the opening pressure of the valve, and the pressure relief valve core overcomes the elasticity of the pressure relief spring and contacts with the sealing conical surface to realize sealing when the pressure relief valve is affected by the opening pressure of the valve. When the cam works and the valve is opened, the relative positions of the tappet body and the plunger are not changed, so that the performance of the engine is ensured.
Description
Technical Field
The invention relates to the technical field of engine valve actuating mechanisms, in particular to a hydraulic tappet.
Background
The lifter acts in the engine valve train to transmit the thrust of the camshaft to the pushrod (or valve stem) and to withstand the lateral forces exerted by the camshaft as it rotates. The tappet is provided with an adjusting screw at the top for adjusting the valve clearance. The reserved valve clearance can solve the problem of loose valve closing caused by thermal expansion, but the valve mechanism can cause impact and generate noise during working due to the existence of the valve clearance. To solve this contradiction, some engines employ hydraulic lifters.
As shown in fig. 1 and 2, a well-known hydraulic tappet is mounted at one end of a rocker arm 30, a tappet body 42A is fixedly connected with the rocker arm and communicated with an engine oil path through an oil port 421A, and a drain gap 46A is provided between the outer circumferential surface of the tappet body 42A and the inner circumferential surface of a plunger 41A.
When the engine valve 60 is at the closing time (the cam 10 does not rotate to the working surface), engine oil is supplied to the hydraulic chamber 43A through the oil inlet 421A and the check valve 44A, and is slowly drained through the drain gap 46A; the plunger 41A moves downward relative to the tappet body 42A under the combined action of the oil pressure and the return spring 45A, compresses the valve 60, eliminates the valve clearance, but is insufficient to overcome the spring force of the valve spring 50, and the valve 60 is still closed.
When the engine works at the opening moment of the valve 60 (the cam 10 rotates to the working surface), the cam 10 pushes the tappet body 42A to move through the push rod 20 and the rocker arm 30, the oil pressure of the hydraulic cavity 43A is increased, the one-way valve 44A is closed, the plunger 41A is pushed to move downwards, and the plunger 41A pushes the valve 60 to open. During the downward movement of the plunger 41A, since the oil pressure in the hydraulic chamber 43A is high, a part of the oil is drained from the high-pressure oil through the drain gap 46A, and after the valve opening process is completed, the check valve 44A is opened to supplement the oil to the hydraulic chamber 43A. The above actions are repeated. The working length of the hydraulic tappet is continuously and automatically adjusted through leakage and supplement of hydraulic oil in the hydraulic cavity, so that the valve mechanism keeps normal work, the valve adjusting mechanism does not have gaps, and impact and noise among parts are reduced.
However, the hydraulic lifter has the following problems:
1) The oil drainage gap requirement is high, and the processing difficulty is high;
2) Due to the existence of the oil drainage gap, when the cam works and the valve is opened, the tappet body and the plunger relatively move to influence the opening stroke of the valve, and particularly when the speed of the engine is changed, the oil drainage quantity at different rotating speeds is different, so that the relative movement quantity of the tappet body and the plunger is different to influence the performance of the engine. In large engines, the effect is more pronounced due to the greater valve opening force.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a hydraulic tappet to solve the problem that when a cam works and a valve is opened, the tappet body and a plunger move relatively to influence the valve opening stroke.
In order to solve the technical problems, the invention adopts the following technical scheme:
A hydraulic lifter, comprising: the hydraulic tappet comprises a tappet body and a plunger, wherein one end of the tappet body is provided with an oil inlet, the other end of the tappet body is open, the plunger extends into the tappet body from the open end of the tappet body and forms a hydraulic cavity with the tappet body, a one-way valve which can communicate an engine oil way with the hydraulic cavity under the action of engine oil pressure is arranged on the inner side of the oil inlet, and a return spring which is used for returning the plunger relative to the tappet body after the valve opening pressure is eliminated is arranged in the hydraulic cavity; the outer peripheral surface of plunger with tappet body's inner peripheral surface sliding fit, its cooperation clearance guarantees the smooth slip and the seal of plunger, the plunger seted up with the communicating pressure release passageway of hydraulic chamber, the pressure release passageway is provided with sealed conical surface, be provided with pressure release case and relief spring in the pressure release passageway, when not receiving the valve to open the pressure effect pressure the pressure release case by the relief spring top is separated from sealed conical surface forms the oil leak clearance, when receiving the valve to open the pressure effect the pressure release case overcome pressure release spring's elasticity and with sealed conical surface contact realizes the seal of hydraulic chamber.
Wherein, the pressure release valve core includes a valve ball.
The pressure relief spring is arranged in a pressure relief channel communicated with the small end of the sealing conical surface and abuts against the pressure relief valve core and one step surface of the pressure relief channel.
The hydraulic cavity is movably provided with a spring seat, the spring seat is provided with a through hole, the through hole is communicated with the hydraulic cavity and the pressure relief channel, and the return spring is arranged in the spring seat.
And a gap is formed between one end of the spring seat, which is propped against the other end of the plunger under the action of the return spring, and the corresponding end face of the tappet body.
The one-way valve comprises a one-way valve core, a limiting spring and a one-way valve seat, wherein a sealing conical surface is arranged on the inner side of the oil inlet, the limiting spring is arranged in the one-way valve seat, the one-way valve seat is arranged on a tappet body of the hydraulic cavity, and the limiting spring props the one-way valve core against the sealing conical surface of the oil inlet.
The return spring is clamped between the one-way valve seat and the spring seat.
Wherein, the pressure release channel communicates with the oil pan.
The hydraulic tappet is arranged on any one transmission part between a cam and a valve of an engine valve mechanism, and an oil inlet of the tappet body is communicated with an engine oil circuit of the engine.
The hydraulic tappet is arranged on a rocker arm of the engine valve mechanism, and the oil inlet is communicated with an engine oil circuit arranged on the rocker arm.
After the technical scheme is adopted, the technical effects achieved are as follows:
when the cam does not work, because the hydraulic plunger is not affected by the opening pressure of the valve at the moment, the pressure relief valve core is propped away from the sealing conical surface of the pressure relief channel by the pressure relief spring, engine oil enters the hydraulic cavity through the oil inlet and the one-way valve, and meanwhile, the engine oil slowly leaks through the gap between the pressure relief valve core and the sealing conical surface, at the moment, the hydraulic tappet is respectively (directly or indirectly) close to the cam and the valve under the combined action of the engine oil pressure and the return spring, and the valve gap is eliminated. When the cam works, the oil pressure of the hydraulic cavity rises, the pressure relief valve core overcomes the elasticity of the pressure relief spring, the hydraulic cavity becomes a closed cavity, no matter how the rotation speed of the engine changes, the relative position of the tappet body and the plunger cannot change, and the performance of the engine is ensured.
Because the oil leakage gap can be formed between the pressure release valve core and the sealing conical surface, when the cam does not work, engine oil of the engine can enter the hydraulic cavity through the oil inlet and the one-way valve and slowly leak through the oil leakage gap, the working length of the hydraulic tappet can be prolonged and shortened, and the thermal expansion gap of a valve actuating mechanism part can be automatically compensated. Compared with the traditional hydraulic tappet, when the cam works, the working length of the hydraulic tappet is almost unchanged (only slightly shortened in the initial stage of the cam work, the shortening amount is controllable), and the valve opening stroke is more 'accurate'.
The hydraulic tappet disclosed by the invention can be arranged on any transmission part between a cam and a valve of an engine valve mechanism, and is preferably arranged on a rocker arm.
Drawings
FIG. 1 is a reference view of a prior art hydraulic lifter in use;
FIG. 2 is a cross-sectional view of the hydraulic lifter of FIG. 1;
FIG. 3 is a cross-sectional view of one embodiment of a hydraulic lifter of the present invention;
In the figure: 10-cam, 20-push rod, 30-rocker arm, 40A-hydraulic tappet, 41A-plunger, 42A-tappet body, 421A-oil inlet, 43A-hydraulic cavity, 44A-check valve, 45A-return spring, 46A-drain clearance, 40B-hydraulic tappet, 41B-plunger, 411B-drain hole, 42B-tappet body, 421B-oil inlet, 43B-hydraulic cavity, 44B-check valve, 45B-return spring, 46B-sealing conical surface, 47B-pressure relief valve core, 48B-pressure relief spring, 49B-spring seat, 491B-through hole, 50-valve spring, 60-valve, 70-oil pan and S-clearance.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 3 and referring to fig. 1, a hydraulic lifter 40B is provided on a rocker arm of an engine valve train (see the position of rocker arm 30 in fig. 1). An oil inlet 421B is formed in one end of the tappet body 42B, the other end of the tappet body is open, a plunger 41B extends into the tappet body 42B from the open end of the tappet body and forms a hydraulic cavity 43B with the tappet body 42B, the oil inlet 421B is communicated with an engine oil circuit (not shown in the figure) arranged on the rocker arm 30, a check valve 44B is arranged on the inner side of the oil inlet 421B, and the check valve 44B can communicate the engine oil circuit with the hydraulic cavity 43B under the action of engine oil pressure. The check valve 44B has a specific structure that includes a check valve core 442B, a limit spring 443B and a check valve seat 441B, wherein a sealing conical surface is provided at the inner side of the oil inlet 421B, the limit spring 443B is disposed in the check valve seat 441B, the check valve seat 441B is provided with an oil through hole and is mounted on a tappet body 42B of the hydraulic cavity, and the limit spring 443B pushes the check valve core 442B against the sealing conical surface of the oil inlet 421. The unidirectional valve core 442B is preferably a valve ball, such as a steel ball.
A return spring 45B for returning the plunger 41B to the tappet body 42B after the valve opening pressure is released is provided in the hydraulic chamber 43B. The hydraulic chamber 43B is movably provided with a spring seat 49B, the spring seat 49B is provided with a through hole 491B, the through hole 491B communicates the hydraulic chamber 43B and the pressure relief channel 411B, and the return spring 45B is arranged in the spring seat 49B and is clamped between the one-way valve seat 441B and the spring seat 45B. Under the action of the elastic force of the return spring 45B, a gap S is formed between one end of the spring seat 49B, which abuts against the other end of the plunger 41B, and the corresponding end surface of the tappet body 42B. The design clearance S is a proper value (the size of the cold state valve clearance of the traditional engine can be referred to), and when the engine is in a starting state and the engine oil pressure is not established, the normal operation of the valve mechanism is ensured.
The outer peripheral surface of the plunger 41B is slidably fitted to the inner peripheral surface of the tappet body 42B, and the fit clearance thereof ensures smooth sliding and sealing of the plunger, from which oil must not leak. The plunger 41B is provided with a pressure release passage 411B communicating with the hydraulic chamber 43B, and the pressure release passage 411B communicates with the oil pan 70. The pressure release channel 411B is provided with a sealing conical surface 46B, and a pressure release valve core 47B and a pressure release spring 48B are arranged in the pressure release channel 411B, and preferably, the pressure release valve core 47B comprises a valve ball, such as a steel ball. The elastic force of the pressure release spring 48B should ensure that when the engine oil reaches the highest value, the pressure release valve core 47B still can be separated from the sealing conical surface 46B to form an oil leakage gap, and when the cam working hydraulic chamber 43B forms high pressure, the pressure release valve core 47B can rapidly seal the sealing conical surface 46B. The pressure release spring 48B is disposed in the pressure release channel 411B communicating with the small end of the sealing conical surface 46B, and abuts against between the pressure release valve core 47B and one of the stepped surfaces of the pressure release channel. When the valve opening pressure is not acted, the pressure release valve core 47B is propped against the sealing conical surface 46B by the pressure release spring 48B; when the valve opening pressure is applied, the relief valve core 47B overcomes the elastic force of the relief spring 48B and contacts the sealing conical surface 46B to seal the hydraulic chamber 43B.
The working principle and the technical effect achieved by the embodiment are as follows:
When the cam 10 does not work (the cam 10 does not rotate to a working surface), because the hydraulic tappet is not affected by the opening pressure of the valve at this time, the pressure relief valve core 47B is propped away from the sealing conical surface 46B of the pressure relief channel by the pressure relief spring 48B to form an oil leakage gap, engine oil enters the hydraulic cavity 43B through the oil inlet 421B and the one-way valve 44B and slowly leaks through the gap between the pressure relief valve core 47B and the sealing conical surface 46B, at this time, the hydraulic tappet is respectively (directly or indirectly) close to the cam 10 and the valve 60 under the combined action of the engine oil pressure and the return spring 45B, the valve gap is eliminated, and the telescopic automatic compensation of the influences of expansion and contraction and the like of all parts is realized. When the cam works (the cam 10 rotates to a working surface), the oil pressure of the hydraulic cavity 43B rises, the pressure relief valve core 47B overcomes the elasticity of the pressure relief spring 48B, the hydraulic cavity 43B becomes a closed cavity, and compared with a traditional hydraulic tappet (working length is shortened), the relative position of the tappet body 42B and the plunger 41B cannot change no matter how the rotation speed of the engine changes, and the performance of the engine is ensured.
In the present embodiment, the hydraulic lifter 40B is provided to the rocker arm, but the position of the hydraulic lifter 40B is not limited thereto, and it may be provided to any one of the transmission members between the cam to the valve of the valve train of the engine.
The present invention is not limited to the above embodiments, and all modifications based on the concept, principle, structure and method of the present invention are included in the scope of the present invention.
Claims (5)
1. A hydraulic lifter, comprising:
The hydraulic tappet comprises a tappet body and a plunger, wherein one end of the tappet body is provided with an oil inlet, the other end of the tappet body is open, the plunger extends into the tappet body from the open end of the tappet body and forms a hydraulic cavity with the tappet body, a one-way valve which can communicate an engine oil way with the hydraulic cavity under the action of engine oil pressure is arranged on the inner side of the oil inlet, and a return spring which is used for returning the plunger relative to the tappet body after the valve opening pressure is eliminated is arranged in the hydraulic cavity; it is characterized in that the method comprises the steps of,
The outer peripheral surface of the plunger is in sliding sealing fit with the inner peripheral surface of the tappet body;
The plunger is provided with a pressure relief channel communicated with the hydraulic cavity, the pressure relief channel is provided with a sealing conical surface, a pressure relief valve core and a pressure relief spring are arranged in the pressure relief channel, the pressure relief valve core is propped away from the sealing conical surface by the pressure relief spring to form an oil leakage gap when the pressure relief valve core is not acted by the opening pressure of the valve, and the pressure relief valve core overcomes the elasticity of the pressure relief spring and contacts with the sealing conical surface to realize the sealing of the hydraulic cavity when the pressure relief valve is acted by the opening pressure of the valve;
the pressure release spring is arranged in a pressure release channel communicated with the small end of the sealing conical surface and is propped against between the pressure release valve core and one step surface of the pressure release channel;
A spring seat is movably arranged in the hydraulic cavity, a through hole is formed in the spring seat, the through hole is communicated with the hydraulic cavity and the pressure relief channel, and the return spring is arranged in the spring seat;
one end of the spring seat is propped against the plunger under the action of the return spring, and a gap is reserved between the other end of the spring seat and the corresponding end face of the tappet body;
The one-way valve comprises a one-way valve core, a limit spring and a one-way valve seat, wherein a sealing conical surface is arranged on the inner side of the oil inlet, the limit spring is arranged in the one-way valve seat, the one-way valve seat is arranged on a tappet body of the hydraulic cavity, and the limit spring pushes the one-way valve core against the sealing conical surface of the oil inlet;
the return spring is clamped between the one-way valve seat and the spring seat.
2. The hydraulic lifter of claim 1 wherein the relief valve spool comprises a valve ball.
3. The hydraulic lifter of claim 1 wherein the relief passage communicates with an oil pan.
4. The hydraulic lifter of claim 1 wherein the hydraulic lifter is disposed on any of the drive components between the cam and the valve of the engine valve train, and wherein the oil inlet of the lifter is in communication with the engine oil circuit.
5. The hydraulic lifter of claim 4 wherein the hydraulic lifter is disposed on a rocker arm of the engine valve train and the oil inlet is in communication with an engine oil gallery disposed on the rocker arm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460474.XA CN111472859B (en) | 2020-05-26 | 2020-05-26 | Hydraulic tappet |
| PCT/CN2021/070619 WO2021238229A1 (en) | 2020-05-26 | 2021-01-07 | Hydraulic tappet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460474.XA CN111472859B (en) | 2020-05-26 | 2020-05-26 | Hydraulic tappet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111472859A CN111472859A (en) | 2020-07-31 |
| CN111472859B true CN111472859B (en) | 2024-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010460474.XA Active CN111472859B (en) | 2020-05-26 | 2020-05-26 | Hydraulic tappet |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111472859B (en) |
| WO (1) | WO2021238229A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107869368A (en) * | 2016-09-27 | 2018-04-03 | 浙江师范大学 | A kind of fluid pressure type of Piezoelectric Driving is without camshaft valve actuating mechanism |
| CN111472859B (en) * | 2020-05-26 | 2024-05-03 | 潍坊力创电子科技有限公司 | Hydraulic tappet |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3967602A (en) * | 1974-06-10 | 1976-07-06 | Brown William G | Hydraulic valve lifter for reciprocating internal combustion engines |
| CN2864104Y (en) * | 2005-09-30 | 2007-01-31 | 无锡开普动力有限公司 | Hydraulic tappet column for engine |
| CN101907000A (en) * | 2010-06-29 | 2010-12-08 | 绵阳富临精工机械有限公司 | Automatically adjusting hydraulic tappet of engine valve clearance |
| CN204200292U (en) * | 2014-11-05 | 2015-03-11 | 吴昌华 | A kind of Valve Gear of Diesel |
| CN206246167U (en) * | 2016-12-08 | 2017-06-13 | 蚌埠市广瑞机械有限公司 | A kind of hydraulic tappet for being easy to oil-feed and draining |
| CN206246165U (en) * | 2016-12-08 | 2017-06-13 | 蚌埠市广瑞机械有限公司 | A kind of hydraulic tappet for conditions of valve clearance ofthe diesel adjustment |
| WO2018149333A1 (en) * | 2017-02-20 | 2018-08-23 | 山东大学 | Valve lift control device of hydraulic fully variable valve mechanism and internal combustion engine |
| CN212250173U (en) * | 2020-05-26 | 2020-12-29 | 潍坊力创电子科技有限公司 | Hydraulic tappet |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB584302A (en) * | 1944-12-28 | 1947-01-10 | Lewis Redman Ord | Improvements in and relating to valve tappets |
| CN101076655B (en) * | 2004-10-14 | 2010-06-30 | 雅各布斯车辆***公司 | System and method for variable valve actuation in an internal combustion engine |
| DE102005025100A1 (en) * | 2005-06-01 | 2006-12-07 | Schaeffler Kg | Valve drive for operating a gas exchange valve has a ball as an adjustable valve clearance element, which is removably inserted in between the recess and the ball socket |
| CN105545400B (en) * | 2016-02-04 | 2019-01-08 | 杭州新坐标科技股份有限公司 | A kind of column formula hydraulic tappet of infinite place circlip |
| CN110541761B (en) * | 2019-09-30 | 2024-04-05 | 江苏卓联精密机械有限公司 | Engine brake hydraulic control device capable of filling oil quickly |
| CN111472859B (en) * | 2020-05-26 | 2024-05-03 | 潍坊力创电子科技有限公司 | Hydraulic tappet |
-
2020
- 2020-05-26 CN CN202010460474.XA patent/CN111472859B/en active Active
-
2021
- 2021-01-07 WO PCT/CN2021/070619 patent/WO2021238229A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3967602A (en) * | 1974-06-10 | 1976-07-06 | Brown William G | Hydraulic valve lifter for reciprocating internal combustion engines |
| CN2864104Y (en) * | 2005-09-30 | 2007-01-31 | 无锡开普动力有限公司 | Hydraulic tappet column for engine |
| CN101907000A (en) * | 2010-06-29 | 2010-12-08 | 绵阳富临精工机械有限公司 | Automatically adjusting hydraulic tappet of engine valve clearance |
| CN204200292U (en) * | 2014-11-05 | 2015-03-11 | 吴昌华 | A kind of Valve Gear of Diesel |
| CN206246167U (en) * | 2016-12-08 | 2017-06-13 | 蚌埠市广瑞机械有限公司 | A kind of hydraulic tappet for being easy to oil-feed and draining |
| CN206246165U (en) * | 2016-12-08 | 2017-06-13 | 蚌埠市广瑞机械有限公司 | A kind of hydraulic tappet for conditions of valve clearance ofthe diesel adjustment |
| WO2018149333A1 (en) * | 2017-02-20 | 2018-08-23 | 山东大学 | Valve lift control device of hydraulic fully variable valve mechanism and internal combustion engine |
| CN212250173U (en) * | 2020-05-26 | 2020-12-29 | 潍坊力创电子科技有限公司 | Hydraulic tappet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111472859A (en) | 2020-07-31 |
| WO2021238229A1 (en) | 2021-12-02 |
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