CN113931712B - Rocker arm assembly with variable valve lift - Google Patents
Rocker arm assembly with variable valve lift Download PDFInfo
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- CN113931712B CN113931712B CN202111168809.1A CN202111168809A CN113931712B CN 113931712 B CN113931712 B CN 113931712B CN 202111168809 A CN202111168809 A CN 202111168809A CN 113931712 B CN113931712 B CN 113931712B
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- piston
- driving
- rocker arm
- limiting
- swing arm
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The present application relates to a rocker arm assembly of variable valve lift, it includes: one end of the rocker arm is connected with the rocker arm roller and is in transmission fit with the cam structure; one end of the swing arm is rotationally connected with the rocker arm, the rotating axial direction of the swing arm is parallel to the rotating axial direction of the rocker arm, and the other end of the swing arm is rotationally connected with the valve bridge assembly; the driving piece is movably arranged on the rocker arm and can be close to or far away from the swing arm, so that the driving piece can be abutted against and drive the swing arm to move when the rocker arm rotates; and the lift adjusting assembly is arranged on the rocker arm and can limit the driving piece at least two positions. The valve bridge assembly is prevented from being limited by different types of valve bridge assemblies, and because the transmission mode is lever transmission, the valve bridge assembly can realize larger lift change in a limited space, has stronger adaptability, saves more space, responds more rapidly during operation, and is beneficial to driving and adjusting the lift of the valve bridge assembly of the engine according to the needs of users.
Description
Technical Field
The application relates to the field of valve actuating mechanisms of vehicle engines, in particular to a rocker arm assembly with variable valve lift.
Background
In an engine, a cam structure drives a rocker roller contacted with the cam structure to drive a rocker to move, and finally, a valve bridge connected with the rocker is driven to lift. With the continuous development of the engine, the variable valve lift technology is an important technology in the field of engines.
The variable valve lift motion mechanism at the present stage can be generally realized by a variable cam or a variable valve bridge. The variable cam mode can be realized by changing the cam position or switching the cam and the rocker roller, and a complex conversion mechanism and a servo motor are often needed for control; the height-variable valve bridge is characterized by that it utilizes the height change of valve bridge to implement valve lift change.
However, the variable cam mode in the stage has the advantages of complex implementation mechanism, high cost and low matching degree; the valve bridge with variable height is limited by the arrangement space at the periphery of the valve bridge, so that the valve bridge is inconvenient to apply to engines with different displacement, and the control oil path of the valve bridge is required to extend from the electromagnetic valve to the interior of the valve bridge, so that the control oil path is longer, the response is slower, and the oil leakage is more along the way.
Disclosure of Invention
The embodiment of the application provides a rocker arm assembly with a variable valve lift, which aims to solve the problems that various modes for realizing the variable valve lift in the related technology are complex in structure, limited in space, difficult to set and the like.
A rocker arm assembly of variable valve lift, comprising:
one end of the rocker arm is connected with the rocker arm roller and is in transmission fit with the cam structure;
one end of the swing arm is rotationally connected with the rocker arm, the rotating axial direction of the swing arm is parallel to the rotating axial direction of the rocker arm, and the other end of the swing arm is rotationally connected with the valve bridge assembly;
the driving piece is movably arranged on the rocker arm and can be close to or far away from the swing arm, so that the driving piece can be abutted against and drive the swing arm to move when the rocker arm rotates; the method comprises the steps of,
the lift adjusting assembly is arranged on the rocker arm and can limit the driving piece at least two positions so as to change the relative angle between the rocker arm and the rocker arm when the driving piece abuts against the rocker arm.
Through above-mentioned scheme, because all rotate between rocking arm, the valve bridge assembly of both sides are connected to the rocking arm both ends, cam structure will produce the trend of relative rotation between rocking arm and the rocking arm when driving the rocking arm and remove, again because the driving piece after the location on the rocking arm can support tightly with the rocking arm, realize that "lever" formula drives the valve bridge assembly and goes up and down to remove. In the process, the position of the driving piece on the rocker arm when the driving piece is abutted against the rocker arm can be changed through the lift adjusting assembly, so that the relative angle between the rocker arm and the rocker arm is changed when the rocker arm is abutted against the rocker arm, namely, the cam structure drives the rocker arm to move from the initial position to the process of being abutted against the rocker arm, the rotating angle of the cam structure is changed, and the distance that the rocker arm drives the valve bridge assembly to move is adjusted, namely, the valve lift is changed.
Compared with the prior art, the variable-height valve bridge structure has the advantages that the structure for adjusting the valve lift is arranged on the rocker arm, the space at the rocker arm is fully utilized, the space at the periphery of the valve bridge assembly is not utilized, the valve bridge assembly is not limited to different types, and the cam structure is in lever type transmission after moving for a certain distance, the cam structure is fed back to the lift of the valve bridge assembly in a certain proportion, and then the position change of the driving piece is fed back to the change of the valve bridge assembly lift in a corresponding proportion, so that the valve bridge assembly can realize larger lift change in a limited space.
In some embodiments, the driver includes a drive piston disposed on the rocker arm,
the lift adjustment assembly includes:
the first limiting piece is arranged on the rocker arm at one side of the driving piston far away from the swing arm and can limit the driving piston moving to the first limiting piece;
the second limiting piece is movably arranged between the swing arm and the first limiting piece and is connected with a driving structure, and the driving structure can drive the second limiting piece to be combined with the driving piston and limit the driving piston, or drive the second limiting piece to release the combination limit of the second limiting piece and the driving piston.
According to the scheme, whether the second limiting piece is combined with the driving piston or not is utilized, the position of the driving piston when the driving piston is in butt joint with the swing arm is adjusted, namely, the driving piston is located at the first limiting piece far away from the swing arm or at the second limiting piece close to the swing arm, so that the position adjustment is converted into the combination relation between the second limiting piece and the driving piston, and further the driving piston is easier to realize and control;
in addition, when the distance between the first limiting part and the second limiting part is set to be large enough according to needs, the distance that the driving piston separated from the second limiting part moves towards the first limiting part under the driving of the cam structure is smaller than the distance between the first limiting part and the second limiting part, namely, the cam structure cannot collide and drive the swing arm to rotate when driving the rocker arm to rotate, and then the valve bridge assembly cannot be driven, at the moment, the cylinder deactivation requirement of the engine is met, and other related operations such as braking of a high-power engine can be further realized.
In some embodiments, the first limiting member is a resisting portion disposed on the rocker arm, so as to block and limit the driving member on a side of the driving member away from the rocker arm.
Through above-mentioned scheme, after the second locating part is relieved with the combination spacing of drive piston, because drive piston is the activity setting on the rocking arm between swing arm and first locating part, when the rocking arm receives cam structure drive to remove, produce the rotation between the relative swing arm, rotate the swing arm of drive piston department and will conflict with drive piston's tip, and then promote drive piston to keep out the portion and remove, and finally after drive piston is contradicted to keep out the portion, swing arm and rocking arm will move together once more, realize that cam structure's partial lift will be offset at drive piston from the removal in-process of second locating part to first locating part, namely, realize changing the lift of valve bridge assembly. And because the resisting part can be realized only through the interference limit, and then the first limiting part only needs to be fixed on the rocker arm, the realization is easy, and then the structural complexity of this scheme is fully reduced.
In some embodiments, a piston cavity for movably mounting the driving piston is arranged on the rocker arm, one end of the piston cavity, which is close to the swing arm, is open, and the inner wall of the cavity bottom, which is far away from the swing arm, forms the resisting part;
the second limiting part is a limiting piston movably arranged on the inner wall of the piston cavity or the driving piston;
a limit groove matched and connected with the limit piston is formed in the driving piston or the piston cavity;
the driving structure controls the end part of the limiting piston to extend into or separate from the limiting groove.
Through the scheme, the limiting piston serving as the second limiting part can be spliced with the driving piston or pulled out and separated from the driving piston under the action of the driving structure, the combination or separation of the second limiting part and the driving piston is converted into the telescopic arrangement of the limiting piston, the complicated function is further converted into the simple and direct working condition, the functional action of the second limiting part can be realized through the simple structure, namely, the lift change of the valve bridge assembly is realized, and the valve bridge assembly has obvious practical significance.
In some embodiments, the limiting groove is annular and is wound on the outer wall of the driving piston, the inner wall of the piston cavity or the driving piston is provided with a mounting cavity for mounting the limiting piston, and the driving piston is in sealing sliding contact with the inner wall of the piston cavity;
the driving structure includes:
the two ends of the elastic piece are respectively connected with the limiting piston and the bottom of the mounting cavity, and can drive the end part of the limiting piston to extend out of the mounting cavity;
the annular groove is wound on the annular groove bottom of the limiting groove, and a gap is reserved between the groove bottom of the annular groove and the end face of the limiting piston which extends into the limiting groove;
the oil cavity is arranged in the rocker arm, filled with hydraulic oil and provided with an oil hole communicated with the annular groove;
and the oil feeding power piece is connected with the oil cavity and is used for feeding hydraulic oil into the annular groove through the oil hole.
According to the scheme, when the driving piston is positioned at the second limiting part, namely the limiting groove of the driving piston is aligned with the limiting piston in the piston cavity, the limiting piston can extend into the limiting groove under the action of the elastic part, and then when the follow-up cam structure drives the rocker arm to move, the driving piston abuts against the swing arm under the limitation of the limiting piston, so that the valve bridge assembly is driven to move on the first lift length;
when the lift of the valve bridge assembly needs to be changed, after hydraulic oil in the oil cavity is fed into the annular groove by the oil feeding power piece, the hydraulic oil extrudes the limiting piston, the limiting piston is gradually pushed out of the limiting groove, the limiting piston is finally pushed out of the limiting groove by the compression elastic piece and is retracted into the mounting cavity, the limiting piston is released from the piston cavity, the driving piston can be in interference with the swing arm in the lifting process of the rocker arm, the driving piston is in a movable state, relative rotation is generated between the rocker arm and the swing arm, the driving piston is gradually pushed to the bottom of the piston cavity, namely the abutting part is in interference, and at the moment, the swing arm and the rocker arm synchronously move in the process of the subsequent lower pressure valve bridge assembly, so that the valve bridge assembly has the second lift length. Finally, the movement control of the limiting piston is further converted into the opening and closing of the oil delivery power piece, and the switching of two lift states of the valve bridge assembly can be rapidly controlled.
In some embodiments, the resisting portion is provided with an air hole for communicating the oil cavity with the outside.
Through the scheme, air between the driving piston and the resisting part can be discharged through the air holes quickly when the driving piston moves towards the resisting part, meanwhile, hydraulic oil in the limiting groove can be discharged through the air holes when being adhered to the inner wall of the piston cavity and finally extruded between the driving piston and the resisting part, the driving piston can be ensured to be fast and accurately close to or far away from the resisting part, the influence of leaked hydraulic oil on the driving piston is avoided, and the movement accuracy of the valve bridge assembly is ensured.
In some embodiments, the lift adjustment assembly further comprises:
the piston reset piece is elastically connected between the driving piston and the first limiting piece and used for driving the driving piston to move from the first limiting piece to the second limiting piece.
Through the scheme, after the driving piston drives the swing arm and the rocker arm to synchronously press the valve bridge assembly under the action of the first limiting piece, and the valve bridge assembly is lifted, the swing arm is relatively far away from the rocker arm in the process, at the moment, the piston reset piece can push the driving piston to move from the first limiting piece to the second limiting piece, and when the lift is not required to be changed, the rocker arm still pushes the driving piston to compress the piston reset piece in the stamping process of the subsequent valve bridge assembly, so that the driving piston moves to the first limiting piece to act; and when the lift of the valve bridge assembly is required to be changed later, the second limiting piece can be controlled to be combined with the driving piston, so that the stamping lift of the valve bridge assembly is changed later.
In some embodiments, the swing arm is provided with a contact portion for contacting with the end of the driving member, and the contact portion or the end face of the driving member is provided with a contact curved surface, so as to realize stable collision between the contact portion and the end face of the driving member.
According to the scheme, due to errors in the size or the assembly position of the swing arm and the swing arm in actual installation, the contact part of the swing arm and the end part of the driving piece on the swing arm are difficult to realize the integral joint conflict between the plane and the plane, the abutting direction between the swing arm and the swing arm is likely to deviate after one of the swing arm and the swing arm is deviated, so that larger contact stress is generated, but the swing arm and the swing arm are contacted with each other in a plane and a curved surface through the arrangement of the contact curved surface, the vertical conflict state is kept continuously after the swing arm and the swing arm are contacted, and the stable conflict between the swing arm and the swing arm is ensured;
meanwhile, when the lift is changed, the end part of the driving piece and the contact part generate relative sliding and rotation, and the contact curved surface can ensure the abutting effect of the end part and the contact part during relative movement, so that the lift change can be smoothly carried out.
In some embodiments, the driving piece is in transmission connection with the swing arm through a transmission piece, and two ends of the transmission piece are respectively in rotational connection with the end part of the driving piece and the swing arm.
Through above-mentioned scheme, carry out the transmission through the driving piece between driving piece and the swing arm and be connected, realize avoiding contact transmission between the two and produce great friction loss at relative pivoted in-process, realize effectively improving practicality and the stability of this application.
In some embodiments, the swing arm is detachably provided with an adjusting bolt, and the bottom end of the adjusting bolt is rotatably connected with the top end of the valve bridge assembly through an elephant foot.
Through the scheme, the swing arm is connected with the valve bridge assembly in a transmission manner, the swing arm can rotate relative to the end part of the valve bridge assembly while driving the valve bridge assembly to move up and down, the swing arm can be effectively matched with the movement of the swing arm, and the detachable mounting mode of the adjusting bolt can be detached for maintenance or replacement when the follow-up requirement is met.
The beneficial effects that technical scheme that this application provided brought include:
the embodiment of the application provides a rocker arm assembly with variable valve lift, because the structure for adjusting the valve lift is arranged on a rocker arm, space at the rocker arm is fully utilized, the space at the periphery of the valve bridge assembly is not utilized, the valve bridge assembly is not limited to different types, and the cam structure in the scheme is in lever type transmission, after a certain distance of motion, the cam structure feeds back the valve bridge assembly lift in a certain proportion, and then the position change of a driving piece feeds back the valve bridge assembly lift change in a corresponding proportion, so that the valve bridge assembly can realize larger lift change in a limited space, and compared with the valve bridge structure with variable height, the corresponding relation between the space position adjustment of the adjusting structure and the valve bridge lift change is adjusted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a rocker arm assembly in a first lift state;
FIG. 2 is a schematic illustration of a rocker arm assembly in a second lift state;
FIG. 3 is a vertical cross-sectional view of the rocker arm assembly in a first lift state;
FIG. 4 is a cross-sectional view of the rocker arm assembly in a first lift state;
FIG. 5 is a vertical cross-sectional view of the rocker arm assembly in a second lift state;
FIG. 6 is a cross-sectional view of the rocker arm assembly in a second lift state;
FIG. 7 is a cross-sectional view of a rocker arm assembly in accordance with various embodiments;
fig. 8 is a vertical cross-sectional view of a rocker arm assembly in a different embodiment.
In the figure:
1. a rocker arm; 10. a rocker roller;
2. a cam structure;
3. swing arms; 30. a contact portion; 31. adjusting a bolt; 32. elephant foot;
4. a valve bridge assembly;
5. a driving member; 50. driving a piston; 500. a limit groove;
60. a first limiting member; 600. a resisting part; 601. a piston chamber; 602. a mounting cavity; 603. air holes;
61. a second limiting piece; 610. a limit piston;
62. a driving structure; 620. an elastic member; 621. an annular groove; 622. an oil chamber; 623. an oil hole;
63. a piston return member;
7. a transmission member; 70. and a lubrication oil duct.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The embodiment of the application provides a rocker arm assembly with a variable valve lift, which can solve the problems of complex structure, limited space, difficult arrangement and the like of various modes for realizing the variable valve lift in the related technology.
Referring to fig. 1 and 2, a rocker arm 1 assembly of variable valve lift, comprising:
one end of the rocker arm 1 is connected with a roller of the rocker arm 1 and is in transmission fit with the cam structure 2;
one end of the swing arm 3 is rotationally connected with the swing arm 1, the rotation axis is parallel to the rotation axis of the swing arm 1, and the other end of the swing arm is in transmission connection with the valve bridge assembly 4;
the driving piece 5 is movably arranged on the rocker arm 1 and can be close to or far away from the swing arm 3, so that the driving piece can be abutted against and drive the swing arm 3 to move when the rocker arm 1 rotates; the method comprises the steps of,
the lift adjusting assembly is arranged on the rocker arm 1 and can limit the driving piece 5 at least two positions (the two positions are the positions of the driving piece 5 in fig. 1 and 2 respectively) so as to change the relative angle between the rocker arm 3 and the rocker arm 1 when the driving piece 5 abuts against the rocker arm 3.
The rocker arm 1 is rotatably disposed in the vehicle body through a rocker arm shaft (not shown in the figure), the rocker arm 3 is rotatably connected with the rocker arm 1 through a pin shaft (in other embodiments, the rocker arm shaft can be used as a pin shaft to realize the rotation connection of the rocker arm and the rocker arm), and the other end of the rocker arm 3 is in a spherical hinged rotation connection relationship with the top end of the valve bridge assembly 4. Furthermore, when the cam structure 2 drives the rocker arm 1 to move, a relative rotation trend is generated between the rocker arm 3 and the rocker arm 1, and as the driving piece 5 positioned on the rocker arm 1 can be abutted against the rocker arm 3, the lever type valve bridge assembly 4 is driven to move up and down (as shown in any state of fig. 1 or fig. 2), in the process, the position of the driving piece 5 on the rocker arm 1 when the driving piece 5 abuts against the rocker arm 3 can be changed through the lift adjusting component (the position of the driving piece 5 is changed from the position of fig. 1 to the position of fig. 2), so that the relative angle between the rocker arm 3 and the rocker arm 1 is changed when the cam structure 2 drives the rocker arm 1 to move from the initial position to the abutting against the rocker arm 3, namely, the rotating angle of the cam structure 2 is changed, and the distance that the rocker arm 1 drives the valve bridge assembly 4 to move is adjusted, namely, the valve lift is changed.
The structure for adjusting the valve lift is arranged on the rocker arm 1, so that the space at the rocker arm 1 is fully utilized, the peripheral space of the valve bridge assembly 4 is not utilized, the valve bridge assembly 4 is not limited to different types, and the cam structure 2 is fed back to the lift of the valve bridge assembly 4 in a certain proportion after moving for a certain distance due to the transmission mode of lever transmission, and further the position change of the driving piece 5 is fed back to the change of the valve bridge assembly 4 lift according to the corresponding lever proportion, so that the valve bridge assembly 4 can realize larger lift change in a limited space, compared with the corresponding relation of adjusting the space position of the structure in the valve bridge structure with variable height and consistent with the valve bridge lift change, the scheme has stronger adaptability, saves more space, responds more rapidly during operation, and is beneficial to driving and adjusting the valve bridge assembly 4 lift according to the requirement of a user;
meanwhile, according to the engine requirements of different vehicle types, the 'lever' type transmission structure of the rocker arm 1-swing arm 3 can adjust the change of the length of force arms on two sides of the 'lever' through modes such as adjusting the positions of the hinge shafts of the rocker arm 1 and the swing arm 3, so as to adjust the corresponding proportion between the moving distance of the driving rocker arm 1 and the moving distance of the driving valve bridge assembly 4 of the cam structure 2. For example, the cam structure 2 drives the rocker arm 1 to move a small distance and drives the valve bridge assembly 4 to move a larger distance, or vice versa; the cam structure 2 may also be caused to lift the rocker arm 1 a distance equal to the distance the valve bridge assembly 4 moves. The scheme can be more effectively applied to different types of vehicles.
Alternatively, referring to fig. 3-4, the driver 5 comprises a driver piston 50 provided on the rocker arm 1,
the lift adjustment assembly includes:
a first stopper 60 which is provided on the rocker arm 1 on a side of the driving piston 50 away from the swing arm 3 and which is capable of stopping the driving piston 50 moving thereto;
the second limiting member 61 is movably disposed between the swing arm 3 and the first limiting member 60, and is connected with a driving structure 62, where the driving structure 62 may drive the second limiting member 61 to combine with the driving piston 50 and limit the driving piston 50, or drive the second limiting member 61 to release the combination limit with the driving piston 50.
The arrangement is that whether the second limiting piece 61 is combined with the driving piston 50 is utilized to adjust the position of the driving piston 50 when the driving piston 50 is in abutting connection with the swing arm 3, namely, the driving piston 50 is positioned at the first limiting piece 60 far away from the swing arm 3 or at the second limiting piece 61 close to the swing arm 3, so that the position adjustment is converted into the combination relation between the second limiting piece 61 and the driving piston 50, and further, the driving piston is easier to realize and control.
In addition, in other embodiments, the difference from the above embodiments is that the distance between the first limiting member 60 and the second limiting member 61 is greater than the distance that the driving piston 50 separated from the second limiting member 61 moves toward the first limiting member 60 under the driving of the cam structure 2, that is, the cam structure 2 cannot collide and drive the swing arm 3 to rotate when driving the swing arm 1 to drive the valve bridge assembly 4, so that the cylinder deactivation requirement of the engine is achieved.
Optionally, the first limiting member 60 is a resisting portion 600 provided on the rocker arm 1, so as to block and limit the driving member 5 on a side of the driving member 5 away from the swing arm 3.
The resisting part 600 is integrally formed on the rocker arm 1 in this embodiment, so that the setting is quicker and more convenient, and meanwhile, the resisting part has better stability, and in other embodiments, the resisting part can be connected and arranged in other modes such as disassembly.
Thus, with reference to fig. 1 and 2, after the second limiting member 61 releases the combination limitation with the driving piston 50, since the driving piston 50 is movably disposed on the rocker arm 1 between the rocker arm 3 and the first limiting member 60, when the rocker arm 1 is driven to move by the cam structure 2, the rocker arm 3 rotating to the driving piston 50 will abut against the end of the driving piston 50, thereby pushing the driving piston 50 to move toward the abutment 600, and finally after the driving piston 50 abuts against the abutment 600, the rocker arm 3 and the rocker arm 1 will move together again, so that the partial lift of the cam structure 2 will be counteracted in the moving process of the driving piston 50 from the second limiting member 61 to the first limiting member 60, that is, the lift of the valve bridge assembly 4 is changed. And because the resisting part 600 can be realized only through the interference limit, and then the first limiting part 60 only needs to be fixed on the rocker arm 1, the realization is easy, and then the structural complexity of the scheme is fully reduced.
Optionally, referring to fig. 3 and 4, the rocker arm 1 is provided with a piston cavity 601 for movably mounting the driving piston 50, one end of the piston cavity 601, which is close to the swing arm 3, is provided with an opening, and the inner wall of the cavity bottom, which is far away from the swing arm 3, forms the resisting part 600;
the second limiting member 61 is a limiting piston 610 movably disposed on the inner wall of the piston cavity 601 or the driving piston 50;
the driving piston 50 or the piston cavity 601 is provided with a limit groove 500 which is connected with the limit piston 610 in a matching way;
the driving structure 62 controls the end of the limiting piston 610 to extend into or out of the limiting groove 500.
The setting like this, the spacing piston 610 as second locating part 61 can carry out grafting with driving piston 50 under the drive structure 62 effect and combine or take out and break away from, realize changing the combination or breaking away from second locating part 61 and driving piston 50 into the flexible setting of spacing piston 610, further change into simpler direct operating mode from more complicated function, and then can realize the function of second locating part 61 under the structure of setting up more simple, realize the lift change of valve bridge assembly 4 promptly, have apparent practical meaning.
In some embodiments, the limit groove 500 is formed in a ring shape and is wound on the outer wall of the driving piston 50, the inner wall of the piston cavity 601 is provided with a mounting cavity 602 for mounting the limit piston 610, and the driving piston 50 is in sealing sliding contact with the inner wall of the piston cavity 601;
the driving structure 62 includes:
the two ends of the elastic element 620 are respectively connected with the limiting piston 610 and the bottom of the installation cavity 602, and can drive the end of the limiting piston 610 to extend out of the installation cavity 602;
an annular groove 621, which is wound around the annular groove bottom of the limit groove 500, and a gap is reserved between the groove bottom and the end surface of the limit piston 610 extending into the limit groove 500;
an oil chamber 622 which is provided in the rocker arm 1 and which contains hydraulic oil, and which is provided with an oil hole 623 communicating with the annular groove 621;
and an oil feeding power member connected to the oil chamber 622 for feeding hydraulic oil into the annular groove 621 through the oil hole 623.
The oil cavity 622 may, in some embodiments, alternatively utilize a mounting shaft hole of a rocker shaft (not shown), and the elastic member 620 is a driving spring mounted at the bottom of the mounting cavity 602, and is disposed in a compressed manner in the mounting cavity 602, so that the limiting piston 610 may continuously be pushed out of the mounting cavity 602. The annular groove 621 at the bottom of the limit groove 500 is a sink groove with a groove width smaller than that of the limit groove 500, so that the limit piston 610 extending into the limit groove 500 cannot extend into the annular groove 621, and a gap for injecting hydraulic oil can be reserved between the bottom of the annular groove 621 and the end surface of the limit piston 610.
Referring to fig. 3 and 4, when the driving piston 50 is located at the second limiting member 61, that is, when the limiting groove 500 of the driving piston 50 is aligned with the limiting piston 610 in the piston cavity 601, the limiting piston 610 can extend into the limiting groove 500 under the action of the elastic member 620, and further when the subsequent cam structure 2 drives the rocker arm 1 to move, the driving piston 50 will abut against the swing arm 3 under the limitation of the limiting piston 610, so as to realize the movement of the driving valve bridge assembly 4 in the first lift length;
referring to fig. 5 and 6, when the lift of the valve bridge assembly 4 needs to be changed, after hydraulic oil in the oil cavity 622 is sent into the annular groove 621 by using the oil-sending power component, the hydraulic oil will squeeze the limiting piston 610, so that the limiting piston 610 is gradually pushed out of the limiting groove 500, and after the limiting piston 610 is completely pushed out of the limiting groove 500 and retracted into the mounting cavity 602 by the compression elastic component 620, the driving piston 50 is released from the limiting in the piston cavity 601, so that the driving piston 50 can collide with the swing arm 3 in the lifting process of the rocker arm 1, and because the driving piston 50 is in a movable state, relative rotation is generated between the rocker arm 1 and the swing arm 3, the driving piston 50 is gradually pushed to the bottom of the piston cavity 601, namely, at the resisting part 600, the driving piston 50 is blocked, and at this time, the swing arm 3 and the rocker arm 1 will synchronously move in the process of subsequently pressing the valve bridge assembly 4, so that the valve bridge assembly 4 moves in the second lift.
By means of the arrangement, the movement control of the limiting piston 610 is further converted into the opening and closing of the oil feeding power piece, and the switching of the two lift states of the valve bridge assembly 4 can be controlled rapidly.
In addition, referring to fig. 7, in other embodiments, the limiting groove 500 is circumferentially formed on the inner wall of the piston cavity 601, the mounting cavity 602 is formed on the driving piston 50, the limiting piston 610 serving as the second limiting member 61 is mounted inside the driving piston 50, the elastic member 620 in the driving structure 62 is correspondingly disposed inside the driving piston 50, the annular groove 621 is formed at the bottom of the limiting groove 500, the oil cavity 622 is still disposed inside the rocker arm 1, and is directly communicated with the annular groove 621 on the inner wall of the piston cavity 601 through the oil feeding hole 623.
Optionally, the blocking portion 600 is provided with an air hole 603 for communicating the oil cavity 622 with the outside.
By the arrangement, air between the driving piston 50 and the resisting part 600 can be quickly discharged through the air holes 603 when the driving piston 50 moves towards the resisting part 600, meanwhile, hydraulic oil in the limiting groove 500 can be discharged through the air holes 603 when being adhered to the inner wall of the piston cavity 601 and finally extruded between the driving piston 50 and the resisting part 600, the driving piston 50 can be quickly and accurately close to or far away from the resisting part 600, the influence of leaked hydraulic oil on the driving piston 50 is avoided, and the movement accuracy of the valve bridge assembly 4 is ensured.
Optionally, referring to fig. 1 and 2, the lift adjustment assembly further includes:
and a piston return member 63 elastically connected between the driving piston 50 and the first stopper 60, and configured to drive the driving piston 50 to move from the first stopper 60 to the second stopper 61.
In this embodiment, the piston return member 63 employs a return spring, and two ends of the return spring respectively abut against the driving piston 50 and the abutment 600 at the bottom of the piston cavity 601. Meanwhile, the end of the driving piston 50 is provided with a sleeve connection part for sleeving the restoring spring or an extending cavity for extending the restoring spring into the sleeve connection part, which is preferable in the embodiment, so that the restoring spring and the driving piston 50 can be mutually staggered on the end, and the driving piston 50 can be ensured to successfully collide with the resisting part 600 in the moving process.
So set up, after driving the swing arm 3 and rocker arm 1 to push down the valve bridge assembly 4 synchronously under the action of the first stop 60 of the driving piston 50, carry on the course that the valve bridge assembly 4 is lifted, the swing arm 3 is relatively far away from rocker arm 1 in this course, the piston reset piece 63 can promote the driving piston 50 to move to the second stop 61 from the first stop 60 at this moment, when need not to change the lift, in the stamping process of the subsequent valve bridge assembly 4, the rocker arm 1 will still promote the driving piston 50 to compress the piston reset piece 63, make the driving piston 50 move to the first stop 60 and act; and when the lift of the valve bridge assembly 4 is required to be changed later, the second limiting piece 61 can be controlled to be combined with the driving piston 50, so that the stamping lift of the valve bridge assembly 4 is changed later.
Optionally, the swing arm 3 is provided with a contact portion 30 for contacting with an end of the driving member 5, and the contact portion 30 or an end surface of the driving member 5 is provided with a contact curved surface, so as to realize stable collision between the contact portion 30 and the end surface of the driving member 5.
The arrangement is that the contact part 30 of the swing arm 3 and the end part of the driving piece 5 on the swing arm 1 are difficult to realize the integral joint conflict between the plane and the plane due to the errors of the size or the assembly position of the swing arm 3 and the swing arm 1 in the actual installation, the joint direction between the two is likely to deviate after one of the positions is deviated, and larger contact stress is generated, but the contact between the two is realized through the arrangement of the contact curved surface, the contact state of the plane and the curved surface is continuously kept, and the stable conflict between the two is ensured;
meanwhile, when the lift is changed, the end part of the driving piece 5 and the contact part 30 slide relatively, and the contact curved surface can ensure the abutting effect of the two parts during the relative movement, so that the lift change can be smoothly carried out.
Referring to fig. 8, in other embodiments, the driving member 5 is in transmission connection with the swing arm 3 through a transmission member 7, and two ends of the transmission member 7 are respectively in rotational connection with the end of the driving member 5 and the swing arm 3.
The transmission part 7 is a connecting fork with two ends respectively connected with the swing arm 3 and the end part of the driving piston 50, and the connecting fork is in spherical hinged movable connection with the end part of the driving piston 50 and is in rotary connection with the swing arm 3 through a pin shaft. Meanwhile, a lubrication oil duct 70 is formed between the limit groove 500 and the connecting fork in the driving piston 50, so that hydraulic oil in the limit groove 500 can enter the end of the connecting fork through the lubrication oil duct 70 to form an automatic lubrication function with the driving piston 50.
The setting like this, carry out the transmission through driving piece 7 between driving piece 5 and the swing arm 3 and be connected, realize avoiding the hard contact between the two, and then avoid the two relatively pivoted in-process to produce great friction loss when contacting, realize effectively improving practicality and the stability of this application.
Optionally, an adjusting bolt 31 is detachably arranged on the swing arm 3, and the bottom end of the adjusting bolt 31 is rotatably connected with the top end of the valve bridge assembly 4 through a elephant foot 32.
The swing arm 3 is provided with an installation shaft hole through which the adjusting bolt 31 passes, and an adjusting nut is connected to the end of the swing arm 3 after the top end of the adjusting bolt 31 passes through the swing arm 3, so that the adjusting bolt 31 is detachably fixed on the swing arm 3, and the bottom end of the adjusting bolt 31 and the top end of the valve bridge assembly 4 are in ball hinge movable connection through a foot 32.
The arrangement realizes the transmission connection of the swing arm 3 and the valve bridge assembly 4, the swing arm 3 can rotate relative to the end part of the valve bridge assembly 4 while driving the valve bridge assembly 4 to move up and down, the swing arm 3 can effectively cooperate with the movement of the rocker arm 1, and the detachable mounting mode of the adjusting bolt 31 can be disassembled for maintenance or replacement when the follow-up needs.
In the description of the present application, it is to be understood that the forward direction of "X" in the drawings represents the right direction, and correspondingly, the reverse direction of "X" represents the left direction; the forward direction of "Y" represents the forward direction, and correspondingly, the reverse direction of "Y" represents the rearward direction; the forward direction of "Z" represents above, and correspondingly, the reverse direction of "Z" represents below, and the azimuth or positional relationship indicated by the terms "X", "Y", "Z", etc. are based on the azimuth or positional relationship shown in the drawings of the specification, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. 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 application. Thus, the present application 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 (6)
1. A rocker arm assembly of variable valve lift, comprising:
one end of the rocker arm (1) is connected with a roller of the rocker arm (1) and is in transmission fit with the cam structure (2);
one end of the swing arm (3) is rotationally connected with the swing arm (1), the rotation axis is parallel to the rotation axis of the swing arm (1), and the other end of the swing arm is rotationally connected with the valve bridge assembly (4);
the driving piece (5) is movably arranged on the rocker arm (1) and can be close to or far away from the swing arm (3) so as to be used for propping against and driving the swing arm (3) to move when the rocker arm (1) rotates; the method comprises the steps of,
the lift adjusting assembly is arranged on the rocker arm (1) and can limit the driving piece (5) at least two positions so as to change the relative angle between the rocker arm (3) and the rocker arm (1) when the driving piece (5) abuts against the rocker arm (3);
the driving piece (5) comprises a driving piston (50) arranged on the rocker arm (1);
the lift adjustment assembly includes:
the first limiting piece (60) is arranged on the rocker arm (1) at one side of the driving piston (50) far away from the swing arm (3) so as to limit the driving piston (50) moving to the first limiting piece;
the second limiting piece (61) is movably arranged between the swing arm (3) and the first limiting piece (60) and is connected with a driving structure (62), and the driving structure (62) can drive the second limiting piece (61) to be combined with the driving piston (50) and limit the driving piston (50), or drive the second limiting piece (61) to release the combination limit with the driving piston (50);
the rocker arm (1) is provided with a piston cavity (601) for movably mounting the driving piston (50), one end, close to the swing arm (3), of the piston cavity (601) is provided with an opening, and the inner wall, far away from the cavity bottom of the swing arm (3), of the piston cavity forms a first limiting part (60);
the distance between the first limiting piece (60) and the second limiting piece (61) is larger than the distance that the driving piston (50) separated from the second limiting piece (61) moves towards the first limiting piece (60) under the driving of the cam structure (2);
the second limiting piece (61) is a limiting piston (610) movably arranged on the inner wall of the piston cavity (601) or the driving piston (50);
a limit groove (500) which is matched and connected with the limit piston (610) is formed in the driving piston (50) or the piston cavity (601);
the driving structure (62) controls the end part of the limiting piston (610) to extend into or separate from the limiting groove (500);
the limiting groove (500) is annularly wound on the outer wall of the driving piston (50), an installation cavity (602) for installing the limiting piston (610) is formed in the inner wall of the piston cavity (601), and the driving piston (50) is in sealing sliding contact with the inner wall of the piston cavity (601);
the drive structure (62) comprises:
the two ends of the elastic piece (620) are respectively connected with the limiting piston (610) and the bottom of the mounting cavity (602), and can drive the end part of the limiting piston (610) to extend out of the mounting cavity (602);
an annular groove (621) which is wound on the annular groove bottom of the limit groove (500), and a gap is reserved between the groove bottom and the end surface of the limit piston (610) which stretches into the limit groove (500);
an oil chamber (622) which is provided in the rocker arm (1) and is filled with hydraulic oil, and which is provided with an oil hole (623) that communicates with the annular groove (621);
an oil feed power member connected to the oil chamber (622) for feeding hydraulic oil into the annular groove (621) through an oil hole (623);
the lift adjustment assembly further includes:
and a piston return member (63) which is elastically connected between the driving piston (50) and the first stopper (60) and is used for driving the driving piston (50) to move from the first stopper (60) to the second stopper (61).
2. A rocker arm assembly of variable valve lift according to claim 1, characterized in that the first limiting member (60) is a abutment (600) provided on the rocker arm (1) for blocking and limiting the driving member (5) on the side of the driving member (5) remote from the swing arm (3).
3. The rocker arm assembly of claim 2, wherein the blocking portion (600) is provided with an air hole (603) for communicating the oil chamber (622) with the outside.
4. The rocker arm assembly of variable valve lift according to claim 1, characterized in that the rocker arm (3) is provided with a contact portion (30) for contacting with the end of the driving member (5), and the contact portion (30) or the end face of the driving member (5) is provided with a contact curved surface, so as to realize stable interference between the contact portion (30) and the end face of the driving member (5).
5. The rocker arm assembly with variable valve lift according to claim 1, characterized in that the driving piece (5) is in transmission connection with the swing arm (3) through a transmission piece (7), and two ends of the transmission piece (7) are respectively in rotational connection with the end part of the driving piece (5) and the swing arm (3).
6. The rocker arm assembly with variable valve lift according to claim 1, characterized in that an adjusting bolt (31) is detachably arranged on the swing arm (3), and the bottom end of the adjusting bolt (31) is rotatably connected with the top end of the valve bridge assembly (4) through a elephant foot (32).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111168809.1A CN113931712B (en) | 2021-09-30 | 2021-09-30 | Rocker arm assembly with variable valve lift |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111168809.1A CN113931712B (en) | 2021-09-30 | 2021-09-30 | Rocker arm assembly with variable valve lift |
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| CN113931712A CN113931712A (en) | 2022-01-14 |
| CN113931712B true CN113931712B (en) | 2023-06-02 |
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| CN202111168809.1A Active CN113931712B (en) | 2021-09-30 | 2021-09-30 | Rocker arm assembly with variable valve lift |
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