CN110318835B - Air valve eccentric wear prevention air distribution mechanism - Google Patents
Air valve eccentric wear prevention air distribution mechanism Download PDFInfo
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- CN110318835B CN110318835B CN201910499144.9A CN201910499144A CN110318835B CN 110318835 B CN110318835 B CN 110318835B CN 201910499144 A CN201910499144 A CN 201910499144A CN 110318835 B CN110318835 B CN 110318835B
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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
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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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
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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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Valve-Gear Or Valve Arrangements (AREA)
Abstract
An air valve eccentric wear prevention air distribution mechanism comprises a rocker arm, a elephant foot and an air valve yoke, wherein the elephant foot comprises a support ball head and a ball socket base, a cylindrical boss is arranged at the position, located at the joint of a rod portion and the ball head, of the support ball head, a first oil duct and a limiting hole are arranged inside the support ball head, an oil hole is formed in the bottom of the ball socket base, one end of the first oil duct is communicated with a second oil duct in the rocker arm, the other end of the first oil duct is communicated with the oil hole through the limiting hole, a third oil duct vertically communicated with the first oil duct is arranged in the cylindrical boss, a plurality of spray holes communicated with the third oil duct are formed in the cylindrical boss, a guide hole is formed in the middle of the bottom end of the air valve yoke, a breathing hole is formed in the upper. The design can avoid the eccentric wear of the air valve, prolong the service life of the air distribution mechanism, improve the working reliability of the air valve yoke, and improve the safety of the engine.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an air valve eccentric wear prevention air distribution mechanism which is mainly suitable for solving the problem that the air valve is prone to eccentric wear when the air distribution mechanism works.
Background
The multi-valve oil injector is a mainstream arrangement form of a modern engine, a valve mechanism is used as a main component of the engine, and a rocker arm pushes two valves to be opened and closed simultaneously by pressing a valve yoke in the intake stroke and the exhaust stroke of the engine. When the rocker arm works, the rocker arm moves in an arc shape to generate a horizontal force perpendicular to the axis of the air valve and a vertical force along the axis direction of the air valve, the air valve generates horizontal displacement under the action of the horizontal force and does linear motion in the vertical direction along the axis direction of the air valve under the action of the vertical force, and the air valve rod can be eccentrically worn under the action of the two forces. The eccentric wear of the air valve is a common phenomenon of engine failure, particularly a gas engine, the high in-cylinder combustion temperature can accelerate the abrasion of the air valve, and the problems of air valve cavitation erosion, difficult starting, insufficient power and the like can be caused in serious conditions.
Chinese patent, application publication No. CN102102559A, application publication No. 2011, 6/22, discloses a compression release type engine braking method and device, wherein an exhaust valve driving chain includes a cam, a rocker arm and a valve bridge, an exhaust valve of the engine includes a first exhaust valve and a second exhaust valve, a top end of a foot-like member is fixed on the rocker arm, a bottom end of the foot-like member is mounted on the valve bridge, and the rocker arm swings up and down to press the valve bridge, thereby simultaneously controlling the first exhaust valve and the second exhaust valve. Although the invention can realize the simultaneous control of a plurality of valves by one rocker arm through the valve bridge, the invention still has the following defects:
when the rocker arm does up-and-down arc motion, the horizontal component force applied to the valve bridge is increased, the air valve rod horizontally swings under the driving of the horizontal component force, and the air valve rod is easy to deviate, so that the air valve is easy to be worn eccentrically.
Disclosure of Invention
The invention aims to overcome the defects and problems of the prior art that the air valve is easy to be eccentrically worn, and provides an air valve eccentric wear prevention air distribution mechanism capable of avoiding the occurrence of air valve eccentric wear.
In order to achieve the above purpose, the technical solution of the invention is as follows: an air valve eccentric wear prevention air distribution mechanism comprises a rocker arm, a elephant foot and an air valve yoke, wherein the elephant foot comprises a support ball head and a ball socket base, the support ball head comprises a rod part and a ball head, the ball head is matched with a ball socket of the ball socket base, the middle part of the rocker arm does up-and-down arc motion around a rotating shaft, one end of the rocker arm is contacted with a cam, the other end of the rocker arm is connected with the rod part, the ball socket base is installed at the top end of the air valve yoke, and two groups of air valves are arranged at;
the support ball head is characterized in that a cylindrical boss is arranged at the position, located at the joint of the rod portion and the ball head, of the support ball head, a first oil duct is arranged inside the support ball head along the central axis of the support ball head, one end of the first oil duct penetrates through the bottom of the support ball head and then is communicated with a second oil duct in the rocker arm, the other end of the first oil duct penetrates through the top of the support ball head, a third oil duct vertically communicated with the first oil duct is arranged in the cylindrical boss, a plurality of spray holes are formed in the cylindrical boss along the tangential direction of the outer wall of the cylindrical boss and are communicated with the third oil duct, an oil hole is formed in the bottom of the ball socket base along the central axis of the ball socket base, one.
And a flow limiting hole is arranged in the ball head along the central axis of the ball head, one end of the flow limiting hole is communicated with the first oil passage, and the other end of the flow limiting hole penetrates through the ball head and is communicated with the oil hole.
The diameter of the cambered surface of the ball socket is larger than that of the cambered surface of the ball head.
The vertical distance L1 between the bottom of the ball socket and the top of the ball socket base is greater than the vertical distance L2 between the top of the cylindrical boss and the top of the ball head.
And a first mounting groove for mounting a rubber ring or a clamp spring is formed in the inner wall of the upper part of the ball socket base.
The middle part of the bottom end of the air valve yoke is provided with a guide hole, the upper part of the guide hole is provided with a breathing hole, the parts of the bottom end of the air valve yoke, which are positioned at the two sides of the guide hole, are symmetrically provided with a second mounting groove, an air valve spring lower seat is arranged right below the air valve yoke, the middle part of the air valve spring lower seat is vertically connected with a guide post, the guide post is inserted in the guide hole, an air valve spring upper seat is arranged between the air valve spring lower seat and the second mounting groove, an air valve guide pipe is inserted in the part of the air valve spring lower seat between the air valve spring upper seat and the air valve spring lower seat, one end of the air valve is connected with the second mounting groove, the other end of the air valve sequentially penetrates through the upper air valve spring seat and the air valve guide pipe and then is connected with the air valve head, the air valve spring is sleeved on the portion, located between the upper air valve spring seat and the lower air valve spring seat, of the air valve, and the air valve guide pipe is located inside the air valve spring.
The air valve yoke is of a T-shaped structure and comprises a horizontal section and a vertical section, one end of the vertical section is perpendicularly connected with the middle of the horizontal section, a guide hole is formed in the middle of the other end of the vertical section, two mounting grooves are symmetrically formed in the bottom surfaces of the two ends of the horizontal section, and a smooth transition section is arranged between the bottom surface of the horizontal section and the outer wall of the vertical section.
The lower air valve spring seat comprises a first circular ring piece and a second circular ring piece which are symmetrically arranged, the outer wall of the first circular ring piece is connected with the outer wall of the second circular ring piece through a transition section, the transition section is perpendicularly connected with the guide column, and the air valve guide pipe is inserted into the inner holes of the first circular ring piece and the second circular ring piece.
The air valve spring is positioned between the air valve spring upper seat and the first annular sheet and the second annular sheet, and limiting bosses are arranged on the outer walls of the first annular sheet and the second annular sheet.
The transition section is vertically connected with a mounting seat, a round hole is formed in the middle of the mounting seat, one end of the guide column is inserted into the round hole, and the other end of the guide column is inserted into the guide hole.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to an air valve eccentric wear prevention air distribution mechanism.A cylindrical boss is arranged at the position, located at the joint of a rod part and a ball head, of a support ball head, a first oil passage is arranged inside the support ball head along the central axis of the support ball head, the first oil passage is communicated with a second oil passage in a rocker arm, a third oil passage vertically communicated with the first oil passage is arranged in the cylindrical boss, a plurality of spray holes are arranged on the cylindrical boss along the tangential direction of the outer wall of the cylindrical boss, the spray holes are communicated with the third oil passage, an oil hole is arranged in the bottom of a ball socket base along the central axis of the bottom of the ball socket base, one end of the oil hole is communicated with the; when the engine works, lubricating oil with certain pressure is sprayed to the inner wall of the ball socket base from the spray hole through the second oil duct, the ball socket base rotates along the supporting ball head under the pushing of the lubricating oil, the phenomenon that the supporting ball head on the elephant foot and the ball socket are in the same position for a long time during working due to the rotation of the elephant foot is avoided, the service life and the working reliability of the mechanism are improved, and the phenomenon that the air valve is eccentric due to the fact that the force in the horizontal direction is increased when the air valve works due to the abrasion of parts is avoided. Therefore, the invention not only can avoid the eccentric wear of the air valve, but also can improve the service life and the working reliability of the air distribution mechanism.
2. According to the air valve eccentric wear prevention air distribution mechanism, the flow limiting hole is formed in the ball head along the central axis of the ball head, one end of the flow limiting hole is communicated with the first oil passage, the other end of the flow limiting hole penetrates through the ball head and then is communicated with the oil hole, the flow limiting hole can guarantee that the ball head and the ball socket base are always in a pressure lubrication state, the pressure and the flow at the position of the spray hole can be guaranteed, and the reliability of the elephant foot work is improved; the diameter of the cambered surface of the ball socket is larger than that of the cambered surface of the ball head, so that the ball socket base is ensured to rotate along the supporting ball head under the pushing of lubricating oil; the vertical distance L1 between the bottom of the ball socket and the top of the ball socket base is greater than the vertical distance L2 between the top of the cylindrical boss and the top of the ball head, so that lubricating oil is sprayed to the inner wall of the ball socket base from the spray hole; the inner wall of the upper portion of the ball socket base is provided with a mounting groove for mounting a rubber ring or a clamp spring, and the ball socket base is prevented from falling off when the rocker arm is moved by restraining and supporting the position between the ball head and the ball socket base through elastic elements such as the rubber ring and the clamp spring. Therefore, the invention has high working reliability.
3. The invention relates to an air valve eccentric wear prevention air distribution mechanism, wherein a guide hole is formed in the middle of the bottom end of an air valve yoke, a breathing hole is formed in the upper part of the guide hole, two mounting grooves are symmetrically formed in the positions, located on the two sides of the guide hole, of the bottom end of the air valve yoke, an air valve spring lower seat is arranged right below the air valve yoke, a guide post is vertically connected to the middle of the air valve spring lower seat, the guide post is inserted into the guide hole, an air valve spring upper seat is arranged between the air valve spring lower seat and the two mounting grooves, an air valve guide pipe is inserted into the air valve spring lower seat, one end of an air valve is connected with the two mounting grooves, the other end of the air valve sequentially penetrates through the air valve spring upper seat and; when the valve actuating mechanism operates, the rocker arm applies downward pressure to the middle of the valve yoke through the elephant foot, the valve yoke pushes the valve at two ends to move downwards under the action of the pressure, and the valve absorbs horizontal overturning force generated at two ends of the valve yoke along the elephant foot due to uneven stress by utilizing a guide part between a valve spring lower seat and the valve yoke in the moving process, so that the moving direction of the valve yoke is always vertical to the valve spring lower seat, the problem that the valve deflects in the moving process is avoided, meanwhile, the guide part can effectively improve the working stability of the valve yoke, the risk that the valve yoke abnormally drops is reduced, and the safety of an engine is improved. Therefore, the invention not only can avoid the eccentric wear of the air valve, but also improves the working stability of the air valve yoke and the safety of the engine.
4. According to the air valve eccentric wear prevention air distribution mechanism, the air valve yoke is of a T-shaped structure and comprises the horizontal section and the vertical section, and the smooth transition section is arranged between the bottom surface of the horizontal section and the outer wall of the vertical section, so that the air valve yoke is simple in structure and high in structural strength; the lower seat of the air valve spring comprises a first circular ring piece and a second circular ring piece which are symmetrically arranged, the outer wall of the first circular ring piece is connected with the outer wall of the second circular ring piece through a transition section, and the transition section is vertically connected with the guide post, so that the lower seat of the air valve spring is simple in structure, low in manufacturing cost and light in weight; limiting bosses are arranged on the outer walls of the first circular ring piece and the second circular ring piece and used for limiting the relative position of the air valve spring and the air valve guide pipe; the transition section is vertically connected with a mounting seat, a round hole is formed in the middle of the mounting seat, and the guide column is inserted into the round hole, so that the guide column is simple and convenient to mount. Therefore, the invention has the advantages of simple structure, high structural strength, low manufacturing cost, light weight, high reliability and simple and convenient installation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the structure of the elephant foot in fig. 1.
Fig. 3 is a sectional view taken along a-a of fig. 2.
Fig. 4 is a schematic view showing the structure of the air valve yoke and the lower seat of the air valve spring in fig. 1.
In the figure: the rocker arm comprises a rocker arm 1, a second oil duct 11, an air valve yoke 2, a guide hole 21, a breathing hole 22, a second mounting groove 23, a horizontal section 24, a vertical section 25, a smooth transition section 26, a support ball head 3, a rod part 31, a ball head 32, a limiting hole 321, a cylindrical boss 33, a third oil duct 331, a spray hole 332, a first oil duct 34, a ball socket base 4, an oil hole 41, a ball socket 42, a first mounting groove 43, a rotating shaft 5, a cam 6, an air valve 7, an air valve spring lower seat 8, a guide column 81, an air valve guide pipe 82, a first circular ring piece 83, a second circular ring piece 84, a transition section 85, an inner hole 86, a limiting boss 87, a mounting seat 88, an air valve spring upper seat 9 and an.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 4, an air valve eccentric wear prevention air distribution mechanism comprises a rocker arm 1, a elephant foot and an air valve yoke 2, wherein the elephant foot comprises a support ball head 3 and a ball socket base 4, the support ball head 3 comprises a rod part 31 and a ball head 32, the ball head 32 is matched with a ball socket 42 of the ball socket base 4, the middle part of the rocker arm 1 makes up-and-down arc motion around a rotating shaft 5, one end of the rocker arm 1 is in contact with a cam 6, the other end of the rocker arm 1 is connected with the rod part 31, the ball socket base 4 is installed at the top end of the air valve yoke 2, and two groups of air valves 7;
a cylindrical boss 33 is arranged at the position, located at the joint of the rod portion 31 and the ball head 32, of the support ball head 3, a first oil passage 34 is arranged inside the support ball head 3 along the central axis of the support ball head, one end of the first oil passage 34 penetrates through the bottom of the support ball head 3 and then is communicated with a second oil passage 11 in the rocker arm 1, the other end of the first oil passage 34 penetrates through the top of the support ball head 3, a third oil passage 331 which is vertically communicated with the first oil passage 34 is arranged in the cylindrical boss 33, a plurality of spray holes 332 are formed in the cylindrical boss 33 along the tangential direction of the outer wall of the cylindrical boss, the spray holes 332 are communicated with the third oil passage 331, an oil hole 41 is formed in the bottom of the ball socket base 4 along the central axis of the bottom, one end of the oil hole 41 is communicated with the.
A flow-limiting hole 321 is formed in the ball head 32 along the central axis thereof, one end of the flow-limiting hole 321 is communicated with the first oil passage 34, and the other end of the flow-limiting hole 321 penetrates through the ball head 32 and is communicated with the oil hole 41.
The cambered surface diameter of the ball socket 42 is larger than that of the ball head 32.
The vertical distance L1 between the bottom of the ball socket 42 and the top of the socket base 4 is greater than the vertical distance L2 between the top of the cylindrical boss 33 and the top of the ball head 32.
And a first mounting groove 43 for mounting a rubber ring or a clamp spring is formed in the inner wall of the upper part of the ball socket base 4.
A guide hole 21 is formed in the middle of the bottom end of the air valve yoke 2, a breathing hole 22 is formed in the upper portion of the guide hole 21, two mounting grooves 23 are symmetrically formed in the positions, located on the two sides of the guide hole 21, of the bottom end of the air valve yoke 2, an air valve spring lower seat 8 is arranged right below the air valve yoke 2, a guide post 81 is vertically connected to the middle of the air valve spring lower seat 8, the guide post 81 is inserted into the guide hole 21, an air valve spring upper seat 9 is arranged between the air valve spring lower seat 8 and the two mounting grooves 23, an air valve guide pipe 82 is inserted into the position, located between the air valve spring upper seat 9 and the air valve spring lower seat 8, of the air valve spring lower seat 8, one end of the air valve 7 is connected with the two mounting grooves 23, the other end of the air valve 7 sequentially penetrates through the air valve spring upper seat 9 and the air valve guide pipe 82 and then is connected with an air valve head, an air, the valve guide 82 is located inside the valve spring 10.
The air valve yoke 2 is of a T-shaped structure, the air valve yoke 2 comprises a horizontal section 24 and a vertical section 25, one end of the vertical section 25 is perpendicularly connected with the middle of the horizontal section 24, a guide hole 21 is formed in the middle of the other end of the vertical section 25, two mounting grooves 23 are symmetrically formed in the bottom surfaces of two ends of the horizontal section 24, and a smooth transition section 26 is arranged between the bottom surface of the horizontal section 24 and the outer wall of the vertical section 25.
The lower air valve spring seat 8 comprises a first circular ring piece 83 and a second circular ring piece 84 which are symmetrically arranged, the outer wall of the first circular ring piece 83 is connected with the outer wall of the second circular ring piece 84 through a transition section 85, the transition section 85 is vertically connected with the guide column 81, and the air valve guide pipe 82 is inserted into inner holes 86 of the first circular ring piece 83 and the second circular ring piece 84.
The air valve spring 10 is positioned between the air valve spring upper seat 9 and the first annular sheet 83 and the second annular sheet 84, and the outer walls of the first annular sheet 83 and the second annular sheet 84 are provided with limiting bosses 87.
The transition section 85 is vertically connected with a mounting seat 88, a round hole is formed in the middle of the mounting seat 88, one end of the guide column 81 is inserted into the round hole, and the other end of the guide column 81 is inserted into the guide hole 21.
The principle of the invention is illustrated as follows:
the valve yoke in the existing air distribution mechanism is lack of necessary condition restriction, and due to certain performance difference (particularly the elastic force of a valve assembly spring) when various parts are produced and the fact that a rocker arm always deviates from the centers of two valves when the rocker arm works in an arc motion stress point, when the rocker arm presses the valve yoke, resistance on two sides of the pressing stress point of the rocker arm in the middle of the valve yoke loses balance to generate a seesaw phenomenon because the elastic force of the valve assemblies at two ends of the valve yoke and the position of the downward pressing part of the rocker arm in the middle of the valve yoke are different, and the force applied to the valve by the valve yoke is not vertical force because the valve yoke is in a deflection state when the valve yoke moves up and down, so that the valve deflects to generate friction with a valve guide pipe when the valve moves up and down.
The design provides an eccentric wear prevention structure which is composed of an air valve yoke for restraining the movement rate of an air valve and a elephant foot capable of automatically rotating and simultaneously drives a multi-air valve type air distribution mechanism by adopting a single rocker arm. The middle part of the rocker arm does up-and-down arc motion around the rotating shaft, one end of the rocker arm is matched with an upper jacking device (a cam shaft) to do up-and-down motion, the other end of the rocker arm is matched with the middle part of the top end of an air valve yoke to do down-pressing motion, two ends of the bottom of the air valve yoke are respectively matched with two sets of air valve assemblies, and two sets of air valves are driven to do up-and-down motion simultaneously through the air.
The rocker arm of the air valve eccentric wear air distribution mechanism comprises a body part and a elephant foot, wherein a second oil duct for supplying oil to the elephant foot is arranged in the rocker arm body, the elephant foot comprises a support ball head and a ball socket base, the support ball head comprises a rod part and a ball head, the rod part is cylindrical, the rod part is connected with a pressing arm of the rocker arm body, the ball head is a spherical cambered surface and is matched with the ball socket base, a cylindrical boss is arranged at the joint of the rod part of the support ball head and the ball head, a first oil duct is arranged in the support ball head along the middle axis, one end of the first oil duct is communicated with the second oil duct in the rocker arm, the other end of the first oil duct penetrates through the top of the support ball head, and a flow limiting hole is arranged at the top of the ball head, the flow limiting hole can ensure that the ball head and the ball socket base are always in a pressure lubrication state, and, a plurality of spray holes are formed in the tangential direction of the outer cylindrical surface of the cylindrical boss; the ball socket base outer surface is cylindrical structure, the middle is the ball socket that cooperates with the bulb, the ball socket sets up and is equipped with the oilhole in the well lower part of cylinder axle center and bottom surface central point, ball socket department cambered surface edge diameter is greater than bulb department cambered surface edge diameter, the wall height between ball socket root and the ball socket base top is greater than cylindrical boss department height, be provided with the mounting groove that is used for installing elastic element such as rubber circle, jump ring on the upper portion internal wall of ball socket base, through the position between elastic element restraint support bulb and the ball socket base during like sufficient assembly, ball socket base drops when avoiding removing the rocking arm.
The working principle of the rocker arm is as follows: when the engine runs, lubricating oil with certain pressure enters the first oil duct in the supporting ball head of the elephant foot part through the second oil duct in the rocker arm body, the first oil duct is divided into two branches in the support ball head, one branch conveys lubricating oil to the joint of the ball head and the ball socket through a flow limiting hole at the top of the ball head, and then reaches the position between the elephant foot and the air valve yoke through an oil hole on the base of the ball socket, the air valve assembly can ensure that the ball head and the ball socket of the elephant foot and the air valve yoke are always in a pressure lubrication state through the flow limiting hole, lubricating oil in the supporting ball head has higher pressure, the upper contact surface and the lower contact surface of the ball socket base are filled with the lubricating oil when the air valve assembly is not compressed, the ball socket base is in a suspension state, the other lubricating oil with certain pressure is sprayed to the inner wall surface of the ball socket base through a third oil duct and a spray hole in the supporting ball head, when the air valve assembly is not compressed, the lubricating oil pushes the ball socket base in a suspension state to rotate along the supporting ball head. The elephant foot rotates to prevent the elephant foot from being in the same position with the air valve yoke and between the supporting ball head on the elephant foot and the ball socket during working, so that the abrasion of parts is reduced, the service life and the working reliability of the mechanism are prolonged, and the phenomenon that the air valve is eccentric due to the fact that the force in the horizontal direction is increased when the air valve works due to the abrasion of the parts is avoided.
On the basis of the existing rocker arm, the elephant foot is provided with a forced lubricating oil channel and a driving spray hole through the inner part of the elephant foot part, so that the elephant foot and related parts have sufficient lubricating conditions, and the elephant foot can automatically rotate under the pushing of lubricating oil; the structure not only reduces the friction on the contact surface of each machine part, but also can effectively avoid fatigue wear caused by the long-term same position of the machine parts (the support ball head and the ball socket base) during working, prolong the service life of the foot-like part and improve the working performance and reliability.
The air valve yoke assembly of the air valve eccentric wear prevention air distribution mechanism comprises an air valve spring lower seat and an air valve yoke, wherein the air valve spring lower seat is of a doubly-connected ring sheet structure, inner holes of rings are respectively matched with two air valve guide pipes, the installation position of the air valve spring lower seat is limited through the air valve guide pipes on a cylinder cover, a limiting boss is arranged at the upper part of the excircle of each ring sheet and used for limiting the relative position between the air valve spring and the air valve guide pipes, the two ring sheets are connected into a whole in a bridging mode, a cylindrical guide column is arranged in the middle of the connecting part between the two ring sheet structures, and the lower end of the guide column is perpendicular to the air valve spring lower seat and is rigidly connected with the air valve spring lower seat; the air valve yoke main body is composed of a front section, a middle section and a rear section, the front section and the rear section are arranged in a T-shaped structure, the front section and the rear section are symmetrically arranged on two sides of the middle section, the upper portion of the middle section is a plane, the plane is matched with the bottom surface of a rocker arm elephant foot, the lower portion of the middle section is provided with a longer guide part, a guide hole is formed in the middle of the guide part along the axis, a breathing hole is formed in the upper portion of the guide hole, mounting grooves are symmetrically formed in the lower portions of two ends of the front section and the rear section, the width of the front section, the width of the middle section and the width.
The working principle of the air valve yoke assembly is as follows: when the gas distribution mechanism is assembled, the lower seat of the gas valve spring is positioned through the gas valve guide pipe on the cylinder cover, the lower seat of the gas valve spring is pressed by the gas valve spring assembly and is attached to the top surface of the cylinder cover, the gas valve spring is assembled and works under the constraint of the limiting boss on the lower seat of the gas valve spring, and the axes of the gas valve spring and the gas valve guide pipe are always on the same axis, so that the random jumping caused by no axial positioning constraint when the spring works is avoided; the air valve yoke is arranged on the top of the air valve, the mounting groove at the lower part of the front section and the rear section of the air valve yoke is matched with the top of the air valve, and the middle guide hole is matched with the guide post on the lower seat of the air valve spring; when the air distribution mechanism works, the rocker arm applies downward pressure to the middle of the air valve yoke through the elephant foot, the air valve yoke decomposes the pressure into two parts and respectively acts on the air valve components at two ends of the air valve yoke, the air valve yoke overcomes the elastic force of springs on the air valve components at two ends under the action of the pressure of the rocker arm and pushes the air valve components at two ends to move up and down along the axis of a guide post on an air valve spring base, and when the air valve yoke moves up and down in a piston mode, lubricating oil and air flowing out of the elephant foot are sucked into the space between the guide hole and the guide post by the aid of a breathing hole at the upper portion of the guide hole to be lubricated, and external force in the guide. The air valve yoke assembly is mainly characterized in that the air valve yoke assembly absorbs horizontal overturning force generated at two ends of the air valve yoke along elephant feet due to uneven stress by utilizing a guide part between an air valve spring lower seat and the air valve yoke, so that the air valve yoke is always in a horizontal state during up-and-down movement, and the problem that the air valve yoke generates a seesaw phenomenon by using the elephant feet as fulcrums due to unbalanced stress at two ends of the air valve yoke when resistance generated by the air valve assembly at the two ends of the air valve yoke is different or stress points of a middle rocker arm are changed during pressing-down of the rocker arm caused by dimensional difference and spring performance difference during processing of parts at the two ends of the air valve yoke is solved, and the problem that the air valve yoke generates deflection in the movement process of the air valve is solved.
The valve yoke assembly can effectively solve the problem that when the valve mechanism works, the valve yoke deflects when the rocker arm presses the valve yoke due to uneven stress at three stress points on the valve yoke, so that the horizontal force is increased when the valve assembly works, and the valve is eccentric; meanwhile, the longer guide part of the air valve yoke assembly can effectively improve the working stability of the air valve yoke, reduce the risk that the air valve yoke abnormally drops, and improve the safety of an engine.
The design effectively solves the problems of abnormal abrasion of the mechanism and eccentric abrasion of the air valve caused by abrasion of the elephant foot, performance difference of parts and the like through two technologies of the elephant foot which is driven to rotate by hydraulic force and the air valve yoke with axial motion constraint, reduces the use failure rate of the air distribution mechanism and improves the working reliability of the air distribution mechanism. The technology and structure adopted by the design only need to design and improve the existing rocker arm and valve yoke, the existing engine can be quickly replaced, and the mechanism does not have any influence on the basic structure of the engine and other parts.
Example 1:
referring to fig. 1 to 4, an air valve eccentric wear prevention air distribution mechanism comprises a rocker arm 1, a elephant foot and an air valve yoke 2, wherein the elephant foot comprises a support ball head 3 and a ball socket base 4, the support ball head 3 comprises a rod part 31 and a ball head 32, the ball head 32 is matched with a ball socket 42 of the ball socket base 4, the middle part of the rocker arm 1 moves up and down in an arc shape around a rotating shaft 5, one end of the rocker arm 1 is in contact with a cam 6, the other end of the rocker arm 1 is connected with the rod part 31, the ball socket base 4 is installed at the top end of the air valve yoke 2, two groups of air valves 7 are arranged at the bottom end of the air valve yoke 2, a cylindrical boss 33 is arranged at the joint of the rod part 31 and the ball head 32 on the support ball head 3, a first oil passage 34 is arranged inside the support ball head 3 along the central axis of the support ball head, one end of the first oil passage 34 penetrates through, a third oil passage 331 vertically communicated with the first oil passage 34 is arranged in the cylindrical boss 33, a plurality of spray holes 332 are formed in the cylindrical boss 33 along the tangential direction of the outer wall of the cylindrical boss, the spray holes 332 are communicated with the third oil passage 331, an oil hole 41 is formed in the bottom of the ball socket base 4 along the central axis of the ball socket base, one end of the oil hole 41 is communicated with the first oil passage 34, and the other end of the oil hole 41 extends between the ball socket base 4 and the air valve yoke 2; a flow limiting hole 321 is formed in the ball head 32 along the central axis of the ball head, one end of the flow limiting hole 321 is communicated with the first oil passage 34, and the other end of the flow limiting hole 321 penetrates through the ball head 32 and is communicated with the oil hole 41; the cambered surface diameter of the ball socket 42 is larger than that of the ball head 32; the vertical distance L1 between the bottom of the ball socket 42 and the top of the ball socket base 4 is greater than the vertical distance L2 between the top of the cylindrical boss 33 and the top of the ball head 32; and a first mounting groove 43 for mounting a rubber ring or a clamp spring is formed in the inner wall of the upper part of the ball socket base 4.
Example 2:
the basic contents are the same as example 1, except that:
referring to fig. 1 to 4, a guide hole 21 is formed in the middle of the bottom end of an air valve yoke 2, a breathing hole 22 is formed in the upper portion of the guide hole 21, two mounting grooves 23 are symmetrically formed in the positions, located on the two sides of the guide hole 21, of the bottom end of the air valve yoke 2, an air valve spring lower seat 8 is arranged right below the air valve yoke 2, a guide post 81 is vertically connected to the middle of the air valve spring lower seat 8, the guide post 81 is inserted into the guide hole 21, an air valve spring upper seat 9 is arranged between the air valve spring lower seat 8 and the two mounting grooves 23, an air valve guide tube 82 is inserted into the position, located between the air valve spring upper seat 9 and the air valve spring lower seat 8, of the air valve spring lower seat 8, one end of the air valve 7 is connected to the two mounting grooves 23, the other end of the air valve 7 sequentially penetrates through the air valve spring upper seat 9 and the air valve guide tube 82 and then is connected to an air valve head, an, the valve guide 82 is positioned inside the valve spring 10; the air valve yoke 2 is of a T-shaped structure, the air valve yoke 2 comprises a horizontal section 24 and a vertical section 25, one end of the vertical section 25 is vertically connected with the middle part of the horizontal section 24, a guide hole 21 is formed in the middle part of the other end of the vertical section 25, two mounting grooves 23 are symmetrically formed in the bottom surfaces of two ends of the horizontal section 24, and a smooth transition section 26 is arranged between the bottom surface of the horizontal section 24 and the outer wall of the vertical section 25; the lower air valve spring seat 8 comprises a first circular ring piece 83 and a second circular ring piece 84 which are symmetrically arranged, the outer wall of the first circular ring piece 83 is connected with the outer wall of the second circular ring piece 84 through a transition section 85, the transition section 85 is vertically connected with the guide column 81, and the air valve guide pipe 82 is inserted into inner holes 86 of the first circular ring piece 83 and the second circular ring piece 84; the air valve spring 10 is positioned between the air valve spring upper seat 9 and the first annular sheet 83 and the second annular sheet 84, and the outer walls of the first annular sheet 83 and the second annular sheet 84 are provided with limiting bosses 87; the transition section 85 is vertically connected with a mounting seat 88, a round hole is formed in the middle of the mounting seat 88, one end of the guide column 81 is inserted into the round hole, and the other end of the guide column 81 is inserted into the guide hole 21.
Claims (10)
1. An air valve eccentric wear prevention air distribution mechanism comprises a rocker arm (1), a elephant foot and an air valve yoke (2), wherein the elephant foot comprises a support ball head (3) and a ball socket base (4), the support ball head (3) comprises a rod part (31) and a ball head (32), the ball head (32) is matched with a ball socket (42) of the ball socket base (4), a first oil duct (34) is arranged inside the support ball head (3) along the central axis of the support ball head, one end of the first oil duct (34) penetrates through the bottom of the support ball head (3) and then is communicated with a second oil duct (11) in the rocker arm (1), the other end of the first oil duct (34) penetrates through the top of the support ball head (3), the middle of the rocker arm (1) does up-and-down arc motion around a rotating shaft (5), one end of the rocker arm (1) is in contact with a cam (6), the other end of the rocker arm (1) is connected with the rod part (31), and, the bottom of air valve yoke (2) is provided with two sets of air valves (7), its characterized in that:
a cylindrical boss (33) is arranged at the position, located at the connecting position of the rod portion (31) and the ball head (32), of the supporting ball head (3), a third oil channel (331) vertically communicated with the first oil channel (34) is arranged in the cylindrical boss (33), a plurality of spray holes (332) are formed in the cylindrical boss (33) along the tangential direction of the outer wall of the cylindrical boss, the spray holes (332) are communicated with the third oil channel (331), an oil hole (41) is formed in the bottom of the ball socket base (4) along the central axis of the ball socket base, one end of the oil hole (41) is communicated with the first oil channel (34), and the other end of the oil hole (41) extends to a position between the ball socket base (4) and the air valve yoke.
2. The air valve eccentric wear prevention air distribution mechanism of claim 1, which is characterized in that: a flow limiting hole (321) is formed in the ball head (32) along the central axis of the ball head, one end of the flow limiting hole (321) is communicated with the first oil passage (34), and the other end of the flow limiting hole (321) penetrates through the ball head (32) and then is communicated with the oil hole (41).
3. The air valve eccentric wear prevention air distribution mechanism of claim 1, which is characterized in that: the cambered surface diameter of the ball socket (42) is larger than that of the ball head (32).
4. The air valve eccentric wear prevention air distribution mechanism of claim 1, which is characterized in that: the vertical distance L1 between the bottom of the ball socket (42) and the top of the ball socket base (4) is larger than the vertical distance L2 between the top of the cylindrical boss (33) and the top of the ball head (32).
5. The air valve eccentric wear prevention air distribution mechanism of claim 1, which is characterized in that: and a first mounting groove (43) for mounting a rubber ring or a clamp spring is formed in the inner wall of the upper part of the ball socket base (4).
6. An air valve eccentric wear prevention air distribution mechanism according to any one of claims 1 to 5, characterized in that: the bottom middle part of air valve yoke (2) is provided with guiding hole (21), and the upper portion of guiding hole (21) is provided with breathing hole (22), and the position symmetry that the bottom of air valve yoke (2) is located guiding hole (21) both sides is provided with mounting groove (23) No. two, be provided with air valve spring lower base (8) under air valve yoke (2), the middle part of air valve spring lower base (8) is connected with guide post (81) perpendicularly, and guide post (81) cartridge is in guiding hole (21), is provided with air valve spring upper base (9) between air valve spring lower base (8) and No. two mounting grooves (23), and the position cartridge that lies in between air valve spring upper base (9) and air valve spring lower base (8) on air valve spring lower base (8) has air valve pipe (82), the one end of air valve (7) is connected with No. two mounting grooves (23), and the other end of air valve (7) passes air valve spring upper base (9) in proper order, The rear part of the air valve guide pipe (82) is connected with an air valve head, an air valve spring (10) is sleeved at the part, positioned between the air valve spring upper seat (9) and the air valve spring lower seat (8), of the air valve (7), and the air valve guide pipe (82) is positioned inside the air valve spring (10).
7. The air valve eccentric wear prevention air distribution mechanism of claim 6, which is characterized in that: the air valve yoke (2) is of a T-shaped structure, the air valve yoke (2) comprises a horizontal section (24) and a vertical section (25), one end of the vertical section (25) is perpendicularly connected with the middle of the horizontal section (24), a guide hole (21) is formed in the middle of the other end of the vertical section (25), two mounting grooves (23) are symmetrically formed in the bottom surfaces of the two ends of the horizontal section (24), and a smooth transition section (26) is arranged between the bottom surface of the horizontal section (24) and the outer wall of the vertical section (25).
8. The air valve eccentric wear prevention air distribution mechanism of claim 6, which is characterized in that: the lower seat (8) of the air valve spring comprises a first circular ring piece (83) and a second circular ring piece (84) which are symmetrically arranged, the outer wall of the first circular ring piece (83) is connected with the outer wall of the second circular ring piece (84) through a transition section (85), the transition section (85) is vertically connected with a guide column (81), and an air valve guide pipe (82) is inserted into an inner hole (86) of the first circular ring piece (83) and the second circular ring piece (84).
9. The air valve eccentric wear prevention air distribution mechanism of claim 8, which is characterized in that: the air valve spring (10) is positioned between the air valve spring upper seat (9) and the first circular ring piece (83) and the second circular ring piece (84), and the outer walls of the first circular ring piece (83) and the second circular ring piece (84) are provided with limiting bosses (87).
10. The air valve eccentric wear prevention air distribution mechanism of claim 8, which is characterized in that: the transition section (85) is vertically connected with a mounting seat (88), a round hole is formed in the middle of the mounting seat (88), one end of the guide column (81) is inserted into the round hole, and the other end of the guide column (81) is inserted into the guide hole (21).
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| CN201910499144.9A CN110318835B (en) | 2019-06-11 | 2019-06-11 | Air valve eccentric wear prevention air distribution mechanism |
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| CN201910499144.9A CN110318835B (en) | 2019-06-11 | 2019-06-11 | Air valve eccentric wear prevention air distribution mechanism |
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| CN110318835B true CN110318835B (en) | 2020-06-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2334820A1 (en) * | 1975-12-12 | 1977-07-08 | Semt | VALVE REFRIGERATION AND / OR LUBRICATION SYSTEM |
| JPS573809U (en) * | 1980-06-10 | 1982-01-09 | ||
| US20140283774A1 (en) * | 2013-03-22 | 2014-09-25 | Caterpillar Inc. | Rocker arm assembly and method of lubricating a valve train |
| CN104564198A (en) * | 2015-01-12 | 2015-04-29 | 陈永臻 | Valve adjusting elephant foot module |
| CN105863766A (en) * | 2016-06-02 | 2016-08-17 | 浙江黎明发动机零部件有限公司 | Rocker arm assembly |
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