CN109667637B - Variable valve lift structure, vehicle and engine - Google Patents
Variable valve lift structure, vehicle and engine Download PDFInfo
- Publication number
- CN109667637B CN109667637B CN201811609064.6A CN201811609064A CN109667637B CN 109667637 B CN109667637 B CN 109667637B CN 201811609064 A CN201811609064 A CN 201811609064A CN 109667637 B CN109667637 B CN 109667637B
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- Prior art keywords
- rocker arm
- shaft
- valve lift
- engine
- shaft sleeve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- 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
- F01L13/0021—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 by modification of rocker arm ratio
- F01L13/0026—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 by modification of rocker arm ratio by means of an eccentric
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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
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
Abstract
The invention discloses a variable valve lift structure, which comprises a rocker arm shaft, a rocker arm, a shaft sleeve and a sliding pin, wherein the rocker arm is provided with an annular wall, the shaft sleeve is arranged in the annular wall and is sleeved on the rocker arm shaft, the shaft sleeve and the rocker arm shaft are eccentrically arranged, the rocker arm shaft is provided with a first accommodating part, the shaft sleeve is provided with a second accommodating part, the rocker arm is provided with a third accommodating part, the shaft sleeve is connected with the rocker arm when the sliding pin is positioned in the second accommodating part and the third accommodating part, the shaft sleeve is connected with the rocker arm when the rocker arm rotates, the shaft axis of the rocker arm shaft is taken as a rotation center, the shaft sleeve is connected with the rocker arm shaft when the sliding pin is positioned in the first accommodating part and the second accommodating part, and. Only a middle shaft sleeve with an offset shaft hole and a simple controllable sliding pin are additionally arranged between a rocker arm and a rocker arm shaft of the traditional fixed valve lift engine, so that the switching between two sets of valve lifts is realized. The structure is simplified, and the reliability is improved. The invention also provides an engine adopting the variable valve lift structure and a vehicle adopting the engine.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a variable valve lift structure, a vehicle and an engine.
Background
The valve lift of the traditional engine is fixed and unchanged, the motion of a valve completely depends on a designed cam profile, and the valve lift design at the moment is a balance selection of the engine under the full-operation working condition, so that the responsiveness of the engine in a high-speed area and a low-speed area cannot be considered. The result is that the engine does not receive both the optimum high speed power and the optimum low speed torque, but a compromise balance of performance is obtained under all operating conditions. The variable valve lift can change the valve lift according to the change of different working conditions of the engine, so that the engine has good responsiveness in a high-speed area and a low-speed area, and the optimal high-speed power and low-speed torque are obtained.
The existing engine valve variable lift technology has the advantages of complex structure, high practical application cost, large control difficulty and high failure rate. The sliding camshaft or the valve rocker and the like bear limited load and are not suitable for being used on a heavy engine with larger valve opening driving force; the hydraulic tappet and the electronic valve are complex in form and structure, high in cost and failure rate and not suitable for commercial vehicles.
Therefore, how to provide a variable valve lift structure to simplify the structure and improve the reliability is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a variable valve lift structure, which simplifies the structure and improves the reliability. Another object of the present invention is to provide an engine employing the above variable valve lift structure and a vehicle employing the above engine.
In order to achieve the purpose, the invention provides the following technical scheme:
a variable valve lift structure comprises a rocker shaft, a rocker arm, a shaft sleeve and a sliding pin, wherein the rocker arm is provided with an annular wall, the shaft sleeve is arranged in the annular wall and sleeved on the rocker shaft,
the shaft sleeve and the rocker arm shaft are eccentrically arranged,
the rocker arm shaft is provided with a first accommodating part, the shaft sleeve is provided with a second accommodating part, the rocker arm is provided with a third accommodating part,
when the sliding pin is positioned in the second accommodation place and the third accommodation place simultaneously, the shaft sleeve is connected with the rocker arm, when the rocker arm rotates, the axis of the rocker arm shaft is taken as a rotation center,
when the sliding pin is simultaneously positioned in the first accommodating part and the second accommodating part, the shaft sleeve is connected with the rocker arm shaft, and when the rocker arm rotates, the axis of the shaft sleeve is taken as a rotation center.
Preferably, the slide pin is a controllable slide pin.
Preferably, the annular wall is provided with a limit groove used as a movement stop point of the shaft sleeve.
Preferably, the limiting groove is formed in a top dead center of the rocker arm.
Preferably, the first accommodating portion and the third accommodating portion are both grooves, and the second accommodating portion is a through hole.
The invention also provides an engine, which comprises a valve lift structure, wherein the valve lift structure is the variable valve lift structure.
Preferably, when the engine is in a normal position, the axis of the rocker shaft, the axis of the boss and the axis of the annular wall are located on the same horizontal line.
The invention also provides a vehicle comprising the engine, wherein the engine is the engine.
The invention also provides a vehicle comprising the engine, wherein the engine is the engine.
The invention provides a variable valve lift structure which comprises a rocker arm shaft, a rocker arm, a shaft sleeve and a sliding pin, wherein an annular wall is arranged on the rocker arm, the shaft sleeve is arranged in the annular wall and sleeved on the rocker arm shaft, the shaft sleeve and the rocker arm shaft are eccentrically arranged, a first accommodating part is arranged on the rocker arm shaft, a second accommodating part is arranged on the shaft sleeve, a third accommodating part is arranged on the rocker arm, when the sliding pin is simultaneously positioned in the second accommodating part and the third accommodating part, the shaft sleeve is connected with the rocker arm, when the rocker arm rotates, the axis of the rocker arm shaft is used as a rotation center, when the sliding pin is simultaneously positioned in the first accommodating part and the second accommodating part, the shaft sleeve is connected with the rocker arm shaft, and when the rocker arm rotates, the axis of the shaft sleeve is used as a rotation center.
The variable valve lift structure provided by the invention is a brand new concept, the basic structure of the traditional fixed valve is not changed, and only a middle shaft sleeve with an offset shaft hole and a simple controllable sliding pin are additionally arranged between a rocker arm and a rocker arm shaft of the traditional fixed valve lift engine, so that the switching between two sets of valve lifts is realized. The valve lift is changed by changing the rotation center of the rocker arm, so that the structure is greatly simplified, and the reliability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional structural view of a variable valve lift structure provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a limiting groove in a variable valve lift structure according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a sliding pin according to an embodiment of the present invention connecting a bushing and a rocker arm;
fig. 4 is a schematic structural diagram of a sliding pin for connecting a shaft sleeve and a rocker arm shaft according to an embodiment of the present invention.
In the above FIGS. 1-4:
the rocker arm comprises a rocker arm shaft 1, a shaft sleeve 2, a rocker arm 3, a sliding pin 4, a first accommodating part 5, a second accommodating part 6, a third accommodating part 7 and a limiting groove 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 is a schematic cross-sectional structural view of a variable valve lift structure according to an embodiment of the invention; FIG. 2 is a schematic structural diagram of a limiting groove in a variable valve lift structure according to an embodiment of the present invention; FIG. 3 is a schematic structural view of a sliding pin according to an embodiment of the present invention connecting a bushing and a rocker arm; fig. 4 is a schematic structural diagram of a sliding pin for connecting a shaft sleeve and a rocker arm shaft according to an embodiment of the present invention.
The variable valve lift structure provided by the embodiment of the invention comprises a rocker arm shaft 1, a rocker arm 3, a shaft sleeve 2 and a sliding pin 4, wherein an annular wall is arranged on the rocker arm 3, the shaft sleeve 2 is arranged in the annular wall and is sleeved on the rocker arm shaft 1, the shaft sleeve 2 and the rocker arm shaft 1 are eccentrically arranged, a first accommodating part 5 is arranged on the rocker arm shaft 1, a second accommodating part 6 is arranged on the shaft sleeve 2, a third accommodating part 7 is arranged on the rocker arm 3, when the sliding pin 4 is simultaneously positioned in the second accommodating part 6 and the third accommodating part 7, the shaft sleeve 2 is connected with the rocker arm 1, when the rocker arm 1 rotates, the axis of the rocker arm shaft 3 is taken as a rotation center, when the sliding pin 4 is simultaneously positioned in the first accommodating part 5 and the second accommodating part 6, the shaft sleeve 2 is connected with the rocker arm shaft 1, and when the rocker arm 3 rotates, the axis of the shaft sleeve 2 is taken.
The variable valve lift structure provided by the embodiment of the invention is a brand new concept, the basic structure of the traditional fixed valve is not changed, and only a middle shaft sleeve with an offset shaft hole and a simple controllable sliding pin are additionally arranged between the rocker arm 3 and the rocker arm shaft 1 of the traditional fixed valve lift engine to realize the switching between two sets of valve lifts. The valve lift is changed by changing the rotation center of the rocker arm 3, the structure is greatly simplified, and the reliability is improved.
Wherein the sliding pin 4 is a controllable sliding pin.
In order to further optimize the above solution, the annular wall is provided with a limit groove 8 for acting as a movement stop point of the sleeve 2. The limiting groove 8 is arranged at the top dead center of the rocker arm 3.
The limiting groove 8 is used for preventing the rocker arm 3 and the shaft sleeve 2 from freely rotating on the fixed rocker arm shaft 1 to cause that the sliding pin 4 cannot be normally controlled, the limiting groove 8 is arranged at the upper stop point of the push rod driving rocker arm 3, and the motion stop point of the shaft sleeve 2 is just consistent with the motion stop point of the rocker arm 3, so that the valve lift is more accurately and reliably switched at the stop point, the relative rotating speed of the rocker arm 3 and the shaft sleeve 2 is zero at the moment, the sliding pin 4 can conveniently move in the shaft sleeve 2 and is combined with the fixed rocker arm shaft or the rocker arm 3, and the valve lift can be changed.
The first accommodating part 5 and the third accommodating part 7 are grooves, and the second accommodating part 6 is a through hole.
During actual work:
when the engine needs smaller valve lift, the controllable sliding pin is controlled to slide to the right side into the groove on the rocker arm 3, so that the shaft sleeve 2 is connected with the rocker arm 3 through the sliding pin 4. At this time, the rocker arm 3 reciprocates about the center O2 of the rocker arm shaft 1 shown in fig. 3 together with the intermediate boss.
Assuming that the stroke of the push rod is x and the valve lift is y at this time, the following can be known according to the lever principle:
valve lift: y is L2/L1·x
When the engine needs larger valve lift, the controllable sliding pin is controlled to slide to the left side into the groove on the fixed rocker shaft 1, so that the shaft sleeve 2 is connected with the fixed rocker shaft 1 through the sliding pin 4. At this time, the boss 2 is integrated with the fixed rocker shaft, and the rocker arm 3 reciprocally rotates around the outer circle center O1 of the boss 2 shown in fig. 4.
At this time, the stroke of the push rod is still x, the valve lift is y', and the following steps can be obtained according to the lever principle:
valve lift: y ═ L4/L3·x
Since the distance L3 between center O1 and the push rod axis is smaller than the distance L1 between center O2 and the push rod axis, and the distance L4 between center O1 and the valve axis is larger than the distance L2 between center O2 and the valve axis, therefore:
y′＝L4/L3·x＞y＝L2/L1·x
therefore, the controllable and variable valve lift can be realized, the structure of the technical scheme is greatly simplified compared with that of the traditional engine valve variable lift technical scheme, the realization difficulty is reduced, the operation is reliable, and no excessive complex, precise and fragile parts exist, so that the variable valve lift control device is suitable for the engine of the medium and heavy commercial vehicle.
The variable valve lift structure provided by the embodiment of the invention comprises the following components:
1. only on the basis of a traditional engine fixed valve lift mechanism, a middle shaft sleeve and a controllable sliding pin device are additionally arranged, axial sliding of shaft parts is avoided, the additionally arranged middle shaft sleeve can improve the bearing capacity of a valve rocker shaft, and the reliability of the valve variable lift technical scheme structure is improved.
2. Complicated and precise parts such as a double-cam molded line cam, a double-rocker system, an axial sliding cam shaft, an axial sliding rocker and the like in the traditional valve variable lift technology are omitted, the controllable sliding pin mechanism can be controlled in a two-pole mode, hydraulic drive or electromagnetic drive can be utilized, the technical requirement of the implementation mode is low, the cost is low, and the technical scheme is convenient to implement and popularize on a large scale to actual products.
3. The limiting groove 8 enables the movement of the middle shaft sleeve to be limited reasonably, and the movement stop point is just consistent with the movement stop point of the rocker arm 3, so that the valve lift is switched at the stop point more accurately and reliably, and the abnormal out-of-control phenomenon that the sliding pin groove cannot be found correctly by excessively rotating the sliding pin mechanism and the rotary center of the valve rocker arm is uncertain can be avoided.
4. The structure is simple, the design and implementation difficulty of the control system is small, the work is reliable, the cost is low, and the concept-to-actual product conversion and the large-scale use and popularization of the product are facilitated.
The embodiment of the invention also provides an engine which comprises a valve lift structure, wherein the valve lift structure is the variable valve lift structure in any one of the embodiments.
Wherein, when the engine is just placed, the axes of the rocker shaft 1, the shaft sleeve 2 and the annular wall are on the same horizontal line.
An embodiment of the invention further provides a vehicle, which comprises an engine, wherein the engine is the engine in any one of the embodiments.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A variable valve lift structure comprises a rocker arm shaft, a rocker arm and a shaft sleeve, wherein the rocker arm is provided with an annular wall, the shaft sleeve is arranged in the annular wall and sleeved on the rocker arm shaft,
the shaft sleeve and the rocker arm shaft are eccentrically arranged,
it is characterized in that the preparation method is characterized in that,
the device also comprises a sliding pin which is arranged on the sliding pin,
the rocker arm shaft is provided with a first accommodating part, the shaft sleeve is provided with a second accommodating part, the rocker arm is provided with a third accommodating part,
when the sliding pin is positioned in the second accommodation place and the third accommodation place simultaneously, the shaft sleeve is connected with the rocker arm, when the rocker arm rotates, the axis of the rocker arm shaft is taken as a rotation center,
when the sliding pin is simultaneously positioned in the first accommodating part and the second accommodating part, the shaft sleeve is connected with the rocker arm shaft, and when the rocker arm rotates, the axis of the shaft sleeve is taken as a rotation center.
2. The variable valve lift structure according to claim 1, wherein the slide pin is a controllable slide pin.
3. The variable valve lift structure according to claim 1, wherein a stopper groove for serving as a movement stop point of the boss is provided on the annular wall.
4. The variable valve lift structure according to claim 3, wherein the stopper groove is provided at a top dead center of the rocker arm.
5. The variable valve lift structure according to claim 1, wherein the first accommodation place and the third accommodation place are both grooves, and the second accommodation place is a through hole.
6. An engine comprising a valve lift structure, characterized in that the valve lift structure is a variable valve lift structure according to any one of claims 1 to 5.
7. The engine of claim 6, wherein the rocker shaft axis, the boss, and the annular wall axis are on the same horizontal line when the engine is upright.
8. A vehicle comprising an engine, characterized in that the engine is as claimed in claim 6.
9. A vehicle comprising an engine, characterized in that the engine is as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811609064.6A CN109667637B (en) | 2018-12-27 | 2018-12-27 | Variable valve lift structure, vehicle and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811609064.6A CN109667637B (en) | 2018-12-27 | 2018-12-27 | Variable valve lift structure, vehicle and engine |
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| Publication Number | Publication Date |
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| CN109667637A CN109667637A (en) | 2019-04-23 |
| CN109667637B true CN109667637B (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811609064.6A Active CN109667637B (en) | 2018-12-27 | 2018-12-27 | Variable valve lift structure, vehicle and engine |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002054410A (en) * | 2000-08-11 | 2002-02-20 | Honda Motor Co Ltd | Opening-angle changeable valve system for engine |
| US6591797B2 (en) * | 2001-03-23 | 2003-07-15 | William W. Entzminger | Variable fulcrum rocker arm |
| JP4220922B2 (en) * | 2004-03-10 | 2009-02-04 | 株式会社オティックス | Variable valve mechanism |
| JP2007198387A (en) * | 2007-03-26 | 2007-08-09 | Hitachi Ltd | Variable valve gear for internal combustion engine |
| CN102797531B (en) * | 2012-08-31 | 2014-10-01 | 长城汽车股份有限公司 | Device capable of changing valve lift |
| CN202970840U (en) * | 2012-10-30 | 2013-06-05 | 长城汽车股份有限公司 | Gear rack rocker arm type variable valve lift mechanism of engine |
| KR20150065447A (en) * | 2013-12-05 | 2015-06-15 | 현대자동차주식회사 | Continuous variable valve lift |
| CN106762000B (en) * | 2016-12-22 | 2019-03-22 | 天津大学 | One kind is based on seperated rocker arm hydraulic stepless variable valve actuator for air |
| CN106837465A (en) * | 2016-12-30 | 2017-06-13 | 浙江大学 | The engine valve actuating mechanism of stepless variable valve lift |
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2018
- 2018-12-27 CN CN201811609064.6A patent/CN109667637B/en active Active
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