CN102022151A - Engine, valve driving mechanism and valve bridge thereof - Google Patents
Engine, valve driving mechanism and valve bridge thereof Download PDFInfo
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- CN102022151A CN102022151A CN 201010612642 CN201010612642A CN102022151A CN 102022151 A CN102022151 A CN 102022151A CN 201010612642 CN201010612642 CN 201010612642 CN 201010612642 A CN201010612642 A CN 201010612642A CN 102022151 A CN102022151 A CN 102022151A
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Abstract
The invention discloses a valve bridge for a valve driving mechanism, the valve driving mechanism includes a guide pin (22), a middle part of the valve bridge (23) is provided with a through hole (231), the guide pin (22) penetrates through the through hole (231), the through hole (231) comprises a conic hole section (2311) and a cylindrical hole section (2312), the guide pin (22) comprises a spherical section (221) of which a bus is an arc line and a cylindrical section (222) of which a bus is a straight line, a contact line between the spherical section (221) and the conic hole section (2311) is a closed loop line, and diameter of the cylindrical hole section (2312 is more than that of the cylindrical section (222). The valve bridge disclosed by the invention can provide structure base for implementing synchronous start and close of two homologous valves, and has simple structure and higher reliability. The invention also discloses a valve driving mechanism including the valve bridge and an engine including the valve driving mechanism.
Description
Technical field
The present invention relates to technical field of engines, particularly a kind of air valve bridge.The invention still further relates to a kind of valve actuating mechanism and a kind of motor that comprises above-mentioned valve actuating mechanism that comprises above-mentioned air valve bridge.
Background technique
Motor is the power source of various vehicles and multiple machinery, and the fine or not direct relation of the service behaviour of motor vehicle and other mechanical service behaviours, and therefore, the service behaviour that improves motor is subject to people's attention all the time.
The gas distribution system of motor is to be used to guarantee that motor opens valve and cut out valve at correct time point, with the system of the discharge of the supply that realizes the motor fresh air and waste gas.Conventional four-valve engine generally comprises two intake valves and two exhaust valves corresponding to same cylinder, and valve of the same name (i.e. two intake valves or two exhaust valves) generally uses the same valve actuating mechanism of whole gas distribution system to drive.
In the working procedure, the bent axle of motor rotates under the effect of piston, and utilize the gear driven camshaft to rotate, thereby cam drive tappet and push rod on the camshaft move up and down, and then drive rocking arm and swing around pitman arm shaft, in the swing process of rocking arm, apply reciprocating thrust force to air valve bridge and valve, and with the Returnning spring effect of cooperatively interacting of valve, realize the opening and closing of valve.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of typical valve actuating mechanism in the prior art.
As shown in FIG., the engine valve actuations mechanism of prior art comprises rocking arm 11, air valve bridge 13, guide finger 12, adjusting screw 17, locking nut 18 and Returnning spring 16, two valves 14 of the same name lay respectively at the two ends of air valve bridge 13, the centre of air valve bridge 13 offers through hole, guide finger 12 is plugged in the through hole, and the bottom of guide finger 12 is plugged in the bearing holes of cylinder head 19; One end of air valve bridge 13 offers tapped hole and positioning hole, the central lines of the two, adjusting screw 17 is installed in the tapped hole, locking nut 18 is positioned at the top of adjusting screw 17, be used to lock the position of adjusting screw 17, the head of the valve stem of a valve is plugged in the positioning hole in two valves 14 of the same name, thereby can regulate the position of these valves by adjusting screw 17 and locking nut 18, and realizes that force transmission with rocking arm 11 is to valve; The other end of air valve bridge 13 contacts by the valve stem top plan of another valve in lower end surface and two valves 14 of the same name, realizes the transmission of the active force of rocking arm 11 to this valve.
The structure of adjusting screw 17 and locking nut 18, can realize adjustment to the valve position, guarantee two valve of the same name opening and closing simultaneously, yet because complex structure, assembly process is subjected to artificial factor bigger, if it is improper to assemble or adjust, the degree of depth deficiency that valve inserts positioning hole then may appear, the phenomenon that causes valve and air valve bridge to break away from mutually, cause great fault, on the other hand, locking nut 18 becomes flexible than being easier in the course of the work, also may cause great accident.
Therefore,, reduce the complexity of structure, just become the present technical issues that need to address of those skilled in the art how guaranteeing to improve reliability of structure on the basis that valve of the same name is opened simultaneously and closed simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of air valve bridge, this air valve bridge can be opened when realizing two valves of the same name and close simultaneously provides architecture basics, and simple in structure, has higher reliability.Another object of the present invention provides a kind of valve actuating mechanism and a kind of motor that comprises above-mentioned valve actuating mechanism that comprises above-mentioned air valve bridge.
For solving the problems of the technologies described above, the invention provides a kind of air valve bridge, be used for valve actuating mechanism, described valve actuating mechanism comprises guide finger, the middle part of described air valve bridge offers through hole, described guide finger passes described through hole, it is characterized in that, described through hole comprises conical bore section and cylindrical hole section, described guide finger comprises that bus is that the sphere section and the bus of circular arc line is the cylindrical section of straight line, the Line of contact of described sphere section and described conical bore section is closed loop wire, and the diameter of described cylindrical hole section is greater than the diameter of described cylindrical section.
Preferably, described cylindrical hole section comprises the first cylindrical hole section and the second cylindrical hole section, and the described first cylindrical hole section connects described conical bore section and the described second cylindrical hole section, and the diameter of the described first cylindrical hole section is less than the diameter of the described second cylindrical hole section.
Preferably, described air valve bridge is provided with the valve groove, and valve tip portion is positioned at described valve groove.
Preferably, the end face of described valve groove is an arc surface.
Preferably, the number of described valve groove is two.
Preferably, the cone angle of described conical bore section is 90 degree.
For solving the problems of the technologies described above, the present invention also provides a kind of valve actuating mechanism, comprises guide finger and air valve bridge, and described air valve bridge is above-mentioned each described air valve bridge.
For solving the problems of the technologies described above, the present invention also provides a kind of motor, comprises valve and the valve actuating mechanism that is used to drive described valve motion, and described valve actuating mechanism is above-mentioned valve actuating mechanism.
Air valve bridge provided by the present invention, be used for valve actuating mechanism, valve actuating mechanism comprises guide finger, the middle part of air valve bridge offers through hole, guide finger passes through hole, and through hole comprises conical bore section and cylindrical hole section, and guide finger comprises that bus is that the sphere section and the bus of circular arc line is the cylindrical section of straight line, the Line of contact of sphere section and conical bore section is closed loop wire, and the diameter of cylindrical hole section is greater than the diameter of cylindrical section.In the working procedure, the rocking arm of motor acts on guide finger, guide finger with force transmission to air valve bridge, and then be passed to the valve of motor, valve is pumped under the acting in conjunction of above-mentioned active force and Returnning spring, realize the opening and closing of valve, when two valves of same air valve bridge promotion can not be opened simultaneously or close, because the cooperation of the conical bore section in the through hole of air valve bridge and the sphere section of guide finger, thereby can adjust the contact position of guide finger and through hole, change the active force that air valve bridge bore, finally change the active force that two valves are born, guarantee that automatically two valves open simultaneously or close.As can be seen, air valve bridge provided by the present invention, because its through hole that guide finger is installed has the conical bore section, can cooperatively interact with the sphere section of guide finger, realization is to the self adaption of the initial unbalance of two valves, open when having guaranteed two valves and closure, thereby open when realizing two valves of the same name and close simultaneously architecture basics is provided, and it is simple in structure, need not to be provided with adjustment screw of the prior art and locking nut, avoided up hill and dale adjusting the improper fault that causes owing to artificial, and the fault that causes owing to nut loosening, not only reduce the complexity of structure, and guaranteed the reliability and the Security of work.
In a kind of preferred implementation, the cylindrical hole section of air valve bridge provided by the present invention comprises the first cylindrical hole section and the second cylindrical hole section, the first cylindrical hole section connects the conical bore section and the second cylindrical hole section, and the diameter of the first cylindrical hole section is less than the diameter of the second cylindrical hole section.The Line of contact of sphere section and conical bore section (being closed loop wire), preferably can guarantee intermediate portion in the conical bore section, if Line of contact is too by last, perhaps too by following, then can make the maximum stress point that air valve bridge bore to move to top intersection or bottom intersection, thereby cause the significantly rising of stress, therefore, the size that conical bore section and sphere section reasonably be set is very important just, and the diameter dimension of cylindrical hole section is little, then can be under the constant situation of cone angle, make the selectable scope of domatic length of conical bore section bigger, also can be under the constant situation of the domatic length of conical bore section, make the selectable range of cone angle bigger, so that under the situation that the size of sphere section is determined, guarantee that Line of contact is in the cardinal principle intermediate portion, on the other hand, owing in processing sphere section, be subjected to the influence of processing technology, will inevitably produce tool withdrawal groove, the diameter dimension of tool withdrawal groove is usually less than the diameter dimension of cylindrical section, therefore, this also provides assurance for the diameter dimension that reduces a part of cylindrical hole section, therefore the cylindrical hole section can be arranged to have ledge structure, make the range of choice of conical bore section bigger, can form on the basis of closed loop wire with the sphere section all the time in the conical bore section guaranteeing, improve the stressed of the two.
The beneficial effect of motor provided by the present invention and valve actuating mechanism is all similar with the beneficial effect of air valve bridge, does not repeat them here.
Description of drawings
Fig. 1 is the structural representation of a kind of typical valve actuating mechanism in the prior art;
The structural representation of the air valve bridge that Fig. 2 is provided for a kind of embodiment of the present invention;
The structural representation of the valve actuating mechanism that Fig. 3 is provided for a kind of embodiment of the present invention;
Fig. 4 is the enlarged diagram of A part shown in Figure 3;
The structural representation of the guide finger that Fig. 5 matches for the air valve bridge that is provided with a kind of embodiment of the present invention shown in Figure 3.
Embodiment
Core of the present invention provides a kind of air valve bridge, and this air valve bridge can be opened when realizing two valves of the same name and close simultaneously provides architecture basics, and simple in structure, has higher reliability.Another core of the present invention provides a kind of valve actuating mechanism and a kind of motor that comprises above-mentioned valve actuating mechanism that comprises above-mentioned air valve bridge.
In order to make those skilled in the art understand technological scheme of the present invention better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 2 to Fig. 5, the structural representation of the air valve bridge that Fig. 2 is provided for a kind of embodiment of the present invention; The structural representation of the valve actuating mechanism that Fig. 3 is provided for a kind of embodiment of the present invention; Fig. 4 is the enlarged diagram of A part shown in Figure 3; The structural representation of the guide finger that Fig. 5 matches for the air valve bridge that is provided with a kind of embodiment of the present invention shown in Figure 3.
As shown in FIG.; Air valve bridge provided by the present invention; Be used for valve actuating mechanism; Its valve actuating mechanism also comprises rocking arm 21; Guide finger 22 and back-moving spring 26; The head of rocking arm 21 contacts with the end face of guide finger 22; The middle part of air valve bridge 23 offers through hole 231; Be positioned on the engine cylinder cap 29 of air valve bridge 23 belows and offer bearing holes 291; Guide finger 22 passes through hole 231; And the bottom of guide finger 22 is plugged in bearing holes 291; Two valves 24 of the same name of one cylinder of engine lay respectively at the two ends of air valve bridge 23; The top of the valve stem of two valves 24 contacts with air valve bridge; Suit back-moving spring 26 and valve guide bushing 25 on the valve stem; The two ends of back-moving spring 26 are supported by supporting seat respectively; Wherein, Through hole 231 comprises conical bore section 2311 and cylindrical hole section 2312; Guide finger 22 comprises that bus is the sphere section 221 of circular arc line and the cylindrical section 222 that bus is straight line; Wherein sphere section 221 is positioned at conical bore section 2311 substantially; And sphere section 221 is closed loop wire with the contact wire of conical bore section 2311, and the diameter of cylindrical hole section 2312 is greater than the diameter of cylindrical section 222.
Particularly, circular arc line as herein described is all line segments with circular shape, is not only a section on the standard round, and therefore, formed sphere section is not only to comprise master ball, can also comprise spheres such as ellipsoid.
Certainly, above-mentioned circular arc line can be a section of standard round line.The standard sphere not only can be realized cooperating of sphere section 221 and conical surface hole section 2311 easily, and processing is simple, the quality of processing height.
On the other hand, the influence that met with stresses by air valve bridge 23, the size of sphere section should be moderate, can not be too big, can not be too little, be in the intermediate portion of conical surface hole section 2311 substantially to guarantee the sphere section 221 and the Line of contact of conical surface hole section 2311, if it is oversize or too small, then Line of contact can on move or move down, thereby make air valve bridge 23 maximum stress points shift toward top intersection or bottom intersection, bring stress significantly to rise.
In the working procedure, the bent axle of motor rotates under the effect of piston, and utilize the gear driven camshaft to rotate, thereby cam drive tappet and push rod on the camshaft move up and down, and then drive rocking arm 21 around the pitman arm shaft reciprocally swinging, when rocking arm 21 during to lower swing, active force is acted on guide finger 22, guide finger 22 with force transmission to air valve bridge 23, and then be passed to the valve 24 of motor, and valve 24 is moved downward under the effect of above-mentioned active force, realize the unlatching of valve 24, simultaneously, Returnning spring 26 is compressed in this process; When rocking arm 21 is upwards swung, the elastic force of Returnning spring 26 acts on supporting base, and then act on air valve bridge 23, make valve 24, air valve bridge 23 and guide finger 22 move upward and realize closing of valve, when two valves 24 of same air valve bridge 23 promotions can not be opened simultaneously or close, because the cooperation of the conical bore section 2311 in the through hole 231 and the sphere section 221 of guide finger 22, sphere section 221 can change position and direction in conical bore section 2311, thereby can change the active force that guide finger 22 and air valve bridge 23 are born, final change the active force that two valves 24 are born, guarantee that automatically two valves 24 open simultaneously or close.
Especially, the diameter of cylindrical hole section is greater than the diameter of cylindrical section, for sphere section 221 can provide assurance in conical bore section 2311 change positions and direction, for the space has been reserved in the inclination of guide finger 22, particularly, the scope of the difference of the diameter of guide finger 22 cylindrical sections 222 and the diameter of cylindrical hole section 2312 can be 0.1mm-0.15mm, the too small easy slant range to guide finger 22 of the difference of diameter causes bigger restriction, make adaptive ability not give full play to, the excessive size of sphere section 221 and conical bore section 2311 that can cause again of the difference of diameter is all big, and being subjected to the restriction of the size of air valve bridge 23, the size of sphere section 221 and conical bore section 2311 all can not be too big.
Particularly, the difference of the diameter of the diameter of cylindrical hole section 2312 and cylindrical section 222 can be 0.125mm.
Yet, in above-mentioned working procedure; rocking arm 21 is around the pitman arm shaft rotation time; the contact position of the head of rocking arm 21 and guide finger 22 not only vertical deviation can take place, and can produce the displacement of substantially horizontal, promptly can produce horizontal slide relative between the head of rocking arm 21 and the guide finger 22; thus can make guide finger 22 bear horizontal frictional force; and above-mentioned frictional force may be passed to valve 24 through air valve bridge 23, finally is passed to valve guide bushing 25, makes valve guide bushing produce eccentric wear.
At above-mentioned valve actuating mechanism, because the underpart of guide finger 22 is plugged in the bearing holes 291 of cylinder head 29, thereby just guide finger 22 transverse force of being born is passed to cylinder head 29, avoided above-mentioned active force to be passed to valve guide bushing 25 by air valve bridge 23 and valve 24, prolong the working life of valve guide bushing 25, reduced user cost; Further, the through hole 231 of air valve bridge 23 provided by the present invention comprises conical bore section 2311, and cooperatively interact in the guide finger 22 of valve actuating mechanism, realized self adaption to the initial unbalance of two valves 24, open when having guaranteed two valves 24 and closed, adjustment screw and locking nut have been fully phased out, avoided up hill and dale owing to the improper fault that causes of artificial adjustment, and the fault that causes owing to nut loosening, not only reduce the complexity of structure, and guaranteed the reliability and the Security of work.
To sum up, air valve bridge provided by the present invention structurally provides the basis of opening and closing when guaranteeing two valves 24, has removed artificial adjustment process from, has guaranteed the reliability and the Security of work, and simple in structure, easy to process, and cost is lower.
In a kind of embodiment, as Fig. 2 and shown in Figure 5, the cylindrical hole section 2312 of air valve bridge 23 provided by the present invention comprises the first cylindrical hole section 23121 and the second cylindrical hole section 23122, the first cylindrical hole section 23121 connects the conical bore section 2311 and the second cylindrical hole section 23122, and the diameter of the first cylindrical hole section 23121 is less than the diameter of the second cylindrical hole section 23122.
The Line of contact (being closed loop wire) of sphere section 221 and conical bore section 2311, preferably can guarantee intermediate portion in conical bore section 2311, if Line of contact is too by last, perhaps too by following, the maximum stress point that then can make air valve bridge 23 be born can move to top intersection or bottom intersection, thereby cause the significantly rising of stress, therefore, the size that conical bore section 2311 and sphere section 221 reasonably be set is very important just, and the diameter dimension of cylindrical hole section 2312 is little, then can be under the constant situation of cone angle, make the selectable scope of domatic length of conical bore section 2311 bigger, also can be under the constant situation of the domatic length of conical bore section 2311, make the selectable range of cone angle bigger, so that under the situation that the size of sphere section 221 is determined, guarantee that Line of contact is in the cardinal principle intermediate portion, on the other hand, owing in processing sphere section 221, be subjected to the influence of processing technology, will inevitably produce tool withdrawal groove 223, the diameter dimension of tool withdrawal groove 223 is usually less than the diameter dimension of cylindrical section 222, therefore, this also provides assurance for the diameter dimension that reduces a part of cylindrical hole section 2312, therefore cylindrical hole section 2312 can be arranged to have ledge structure, make the range of choice of conical bore section 2311 bigger, can be all the time form on the basis of closed loop wire in conical bore section 2311 guaranteeing, improve the stressed of the two with sphere section 221.
Especially, for easy to process, the cone angle of conical bore section 2311 can be set at 90 degree.Thereby can guarantee that Line of contact is positioned at the intermediate portion of conical bore section 2311 substantially by the domatic length of adjusting conical bore section 2311.
Particularly, please refer to Fig. 2, can also be provided with valve groove 232 on the air valve bridge 23, be plugged in valve groove 232 with head with the valve stem of motor.Because the position of valve stem determines, the head of valve stem is plugged in valve groove 232, can limit the position of air valve bridge 23, prevent that air valve bridge 23 is around guide finger 22 rotations; Valve groove 232 is easy to process simultaneously, need not to take additional space.
Certainly, also can adopt other mode to limit the position of air valve bridge 23, such as: at the lower surface welding baffle plate or the baffle ring of air valve bridge 23, as long as can realize motion by valve stem restriction air valve bridge 23.
In order to improve spacing accuracy, can also all offer valve groove 232 at the two ends of air valve bridge, and make the head of two valves 24 of the same name all be plugged in valve groove 232; Certainly, also a valve groove 232 can only be set, the location that utilizes guide finger 22 and valve 24 to realize to air valve bridge 23.
Further, the end face of valve groove 232 can be arc surface, as shown in Figure 4, arc surface can be specially a section or a section of sphere of periphery, under the effect of external force, valve 24 may run-off the straight, when valve 24 tilts, because the end face of valve groove 232 is arc surface or sphere, reduced the side-play amount of air valve bridge 23 with the point of action of the power at the top of valve stem, make the point of contact of the two still be in the central position of valve stem substantially, thereby guaranteed the stressed uniformity of valve stem, and then guaranteed the normal opening and closing of valve.
Correspondingly, the surface of contact that contacts with the end face of guide finger 22 of the head of the rocking arm 21 of valve actuating mechanism also can be arc surface.The displacement amount of the force position that causes with the inclination that reduces owing to rocking arm 21 or guide finger 22 as far as possible improves the stressed of guide finger 22.
In addition, the present invention also provides a kind of valve actuating mechanism, comprises guide finger and air valve bridge, and air valve bridge is above-mentioned air valve bridge, and the structure of other each several parts of this valve actuating mechanism please refer to prior art, and this paper repeats no more.
Further, the present invention also provides a kind of motor, comprises valve and the valve actuating mechanism that is used to drive described valve motion, and valve actuating mechanism is above-mentioned valve actuating mechanism, the structure of other each several parts of this motor please refer to prior art, and this paper repeats no more.
More than motor provided by the present invention, valve actuating mechanism and air valve bridge thereof are described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (8)
1. air valve bridge, be used for valve actuating mechanism, described valve actuating mechanism comprises guide finger (22), the middle part of described air valve bridge (23) offers through hole (231), described guide finger (22) passes described through hole (231), it is characterized in that, described through hole (231) comprises conical bore section (2311) and cylindrical hole section (2312), described guide finger (22) comprises that bus is the sphere section (221) of circular arc line and the cylindrical section (222) that bus is straight line, described sphere section (221) is closed loop wire with the Line of contact of described conical bore section (2311), and the diameter of described cylindrical hole section (2312) is greater than the diameter of described cylindrical section (222).
2. air valve bridge according to claim 1, it is characterized in that, described cylindrical hole section (2312) comprises the first cylindrical hole section (23121) and the second cylindrical hole section (23122), the described first cylindrical hole section (23121) connects described conical bore section (2311) and the described second cylindrical hole section (23122), and the diameter of the described first cylindrical hole section (23121) is less than the diameter of the described second cylindrical hole section (23122).
3. air valve bridge according to claim 1 is characterized in that, described air valve bridge (23) is provided with valve groove (232), and valve tip portion is positioned at described valve groove (232).
4. air valve bridge according to claim 3 is characterized in that, the end face of described valve groove (232) is an arc surface.
5. air valve bridge according to claim 3 is characterized in that, the number of described valve groove (232) is two.
6. according to each described air valve bridge of claim 1 to 5, it is characterized in that the cone angle of described conical bore section (2311) is 90 degree.
7. a valve actuating mechanism comprises guide finger and air valve bridge, it is characterized in that, described air valve bridge is each described air valve bridge of claim 1 to 6.
8. a motor comprises valve and the valve actuating mechanism that is used to drive described valve motion, it is characterized in that described valve actuating mechanism is the described valve actuating mechanism of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106126429A CN102022151B (en) | 2010-12-29 | 2010-12-29 | Valve bridge of engine valve driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106126429A CN102022151B (en) | 2010-12-29 | 2010-12-29 | Valve bridge of engine valve driving mechanism |
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| CN102022151A true CN102022151A (en) | 2011-04-20 |
| CN102022151B CN102022151B (en) | 2012-07-04 |
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| CN2010106126429A Active CN102022151B (en) | 2010-12-29 | 2010-12-29 | Valve bridge of engine valve driving mechanism |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102011618A (en) * | 2010-12-29 | 2011-04-13 | 潍柴动力扬州柴油机有限责任公司 | Engine, valve actuating mechanism and guide pin of valve actuating mechanism |
| CN103216285A (en) * | 2013-04-09 | 2013-07-24 | 安徽江淮汽车股份有限公司 | Air door bridge and top camshaft engine |
| CN107503815A (en) * | 2017-09-21 | 2017-12-22 | 潍柴动力股份有限公司 | A kind of air valve bridge, valve actuating mechanism and engine |
| CN110295961A (en) * | 2018-03-21 | 2019-10-01 | 潍柴动力股份有限公司 | Air valve bridge and four-valve engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107503815A (en) * | 2017-09-21 | 2017-12-22 | 潍柴动力股份有限公司 | A kind of air valve bridge, valve actuating mechanism and engine |
| CN107503815B (en) * | 2017-09-21 | 2020-08-21 | 潍柴动力股份有限公司 | Valve bridge, valve driving mechanism and engine |
| CN110295961A (en) * | 2018-03-21 | 2019-10-01 | 潍柴动力股份有限公司 | Air valve bridge and four-valve engine |
| CN110295961B (en) * | 2018-03-21 | 2020-09-29 | 潍柴动力股份有限公司 | Valve bridge and four-valve engine |
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| Publication number | Publication date |
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| CN102022151B (en) | 2012-07-04 |
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