CN113931712A - Rocker arm assembly with variable valve lift - Google Patents

Rocker arm assembly with variable valve lift Download PDF

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Publication number
CN113931712A
CN113931712A CN202111168809.1A CN202111168809A CN113931712A CN 113931712 A CN113931712 A CN 113931712A CN 202111168809 A CN202111168809 A CN 202111168809A CN 113931712 A CN113931712 A CN 113931712A
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China
Prior art keywords
piston
rocker arm
driving
limiting
swing arm
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Granted
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CN202111168809.1A
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Chinese (zh)
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CN113931712B (en
Inventor
吴囿霖
张芳
万虎
李庆华
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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Priority to CN202111168809.1A priority Critical patent/CN113931712B/en
Publication of CN113931712A publication Critical patent/CN113931712A/en
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Publication of CN113931712B publication Critical patent/CN113931712B/en
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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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The 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 rotatably 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 rotatably 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 as to 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 position of the driving piece at least two positions. The valve bridge assembly lift adjusting device has the advantages that limitation to different types of valve bridge assemblies is avoided, in addition, due to the fact that the transmission mode is 'lever' type transmission, the valve bridge assemblies can achieve large lift change in a limited space, the adaptability is stronger, the space is saved, the response is quicker during operation, and the valve bridge assembly lift adjusting device is beneficial to driving and adjusting the lift of the engine valve bridge assembly according to user requirements.

Description

Rocker arm assembly with variable valve lift
Technical Field
The application relates to the field of valve actuating mechanisms of vehicle engines, in particular to a rocker arm assembly with a variable valve lift.
Background
In an engine, a cam structure drives a rocker roller in contact 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 becomes an important technology in the field of the engine.
At present, the variable valve lift motion mechanism can be realized by a variable cam or a variable valve bridge and the like. The variable cam mode can be realized by changing the cam position or switching the cam and the rocker roller, and is often controlled by a complicated conversion mechanism and a servo motor; the variable height valve bridge utilizes the height change of the valve bridge to realize the valve lift change.
However, in the variable cam mode in the implementation stage, the implementation mechanism is complex, the cost is high, and the matching degree is low; the variable-height valve bridge mode is limited by the arrangement space on the periphery of the valve bridge, so that the variable-height valve bridge is inconvenient to apply to engines with different discharge capacities, and a control oil path is longer and slower in response because the control oil path needs to extend from the electromagnetic valve to the inside of the valve bridge, and more engine oil leaks along the path.
Disclosure of Invention
The embodiment of the application provides a rocker arm assembly with a variable valve lift, and 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 variable valve lift rocker assembly, 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 rotatably 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 rotatably 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 as to be abutted against and drive the swing arm to move when the rocker arm rotates; and the number of the first and second groups,
and the lift adjusting assembly is arranged on the rocker arm and can limit the position of the driving piece at least two positions so as to change the relative angle between the swing arm and the rocker arm when the driving piece abuts against the swing arm.
Through the scheme, the two ends of the swing arm are rotationally connected with the rocker arms and the valve bridge assemblies on the two sides, when the cam structure drives the rocker arms to move, the trend of relative rotation is generated between the swing arms, and the lever type valve bridge assembly is driven to lift and move due to the fact that the driving piece positioned on the rocker arms can be tightly abutted to the swing arms. In the process, the position of the driving part on the rocker arm when the driving part and the rocker arm are tightly abutted can be changed through the lift adjusting component, so that the relative angle between the rocker arm and the rocker arm is changed when the rocker arm and the rocker arm are tightly abutted, namely, the rotating angle of the cam structure is changed in the process that the cam structure drives the rocker arm to move from the initial position to the process that the rocker arm is tightly abutted to the rocker arm, and the distance that the rocker arm drives the valve bridge assembly to move is adjusted, namely the change of the valve lift.
Compared with the variable-height valve bridge structure in the related technology, the structure for adjusting the valve lift is positioned on the rocker arm, the space at the rocker arm is fully utilized, the peripheral space of the valve bridge assembly is not utilized, the limitation to different types of valve bridge assemblies is avoided, and the transmission mode is lever transmission, the cam structure in the scheme feeds back the lift of the valve bridge assembly in a certain proportion after moving for a certain distance, and then the position change of the driving part feeds back the change of the lift of the valve bridge assembly in a corresponding proportion, so that the valve bridge assembly can realize larger lift change in a limited space, compared with the corresponding relation that the space position adjustment of the adjusting structure in the variable-height valve bridge structure is consistent with the height change of the valve bridge lift, the scheme has stronger adaptability, saves more space and has quicker response during operation, the lift range of the engine valve axle assembly can be driven and adjusted according to the requirements of users.
In some embodiments, the drive member comprises 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, which is far away from the swing arm, and can limit the driving piston moving to the position;
and the second limiting part is movably arranged between the swing arm and the first limiting part and is connected with a driving structure, and the driving structure can drive the second limiting part to be combined with the driving piston and limit the driving piston or drive the second limiting part to remove the combination limit with the driving piston.
Through the scheme, the position of the driving piston when the driving piston is abutted against the swing arm is adjusted by utilizing whether the second limiting piece is combined with the driving piston or not, namely, the driving piston is positioned 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 adjustment of the position is converted into the combination relation between the second limiting piece and the driving piston, and the realization and the control are easier;
in addition, when the distance between the first limiting part and the second limiting part is set to be large enough as required, the distance of the driving piston separated from the second limiting part moving 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 be collided and drives the swing arm to rotate when driving the swing arm to rotate, and further cannot drive the valve bridge assembly, the cylinder-out requirement of the engine can be met at the moment, and other related operations can be further realized, such as the braking of a high-power engine.
In some embodiments, the first limiting member is a stopping portion disposed on the rocker arm, so as to stop and limit the driving member on a side of the driving member away from the swing arm.
Through the above scheme, after the second limiting part is removed from the combination with the driving piston for limiting, the driving piston is movably arranged on the rocker arm between the rocker arm and the first limiting part, when the rocker arm is driven by the cam structure to move, the opposite rocker arms rotate, the rocker arm rotating to the driving piston is abutted to the end part of the driving piston, the driving piston is further pushed to move towards the abutting part, finally, after the driving piston is abutted to the abutting part, the rocker arm and the rocker arm move together again, partial lift of the cam structure is achieved, the partial lift of the driving piston is offset in the moving process from the second limiting part to the first limiting part, namely, the lift of the valve bridge assembly is changed. And because the part of keeping out only can realize through contradicting spacing, and then make first locating part only need fix on the rocking arm can, easily realize, and then fully reduce the structural complexity of this scheme.
In some embodiments, the rocker arm is provided with a piston cavity for movably mounting the driving piston, one end of the piston cavity close to the swing arm is open, and the inner wall of the piston cavity far away from the cavity bottom of 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 drive 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 above scheme, as the spacing piston of second locating part can peg graft with drive piston under the drive structure effect and combine or take out and break away from, realize combining or breaking away from the flexible setting of changing into spacing piston with second locating part and drive piston, further change into simpler direct operating mode from more complicated function, and then can get off the function effect of realizing the second locating part through setting up simpler structure, realize the lift change of valve bridge assembly promptly, have apparent practical meaning.
In some embodiments, the limiting groove is annularly arranged around the outer wall of the driving piston, an installation cavity for installing the limiting piston is formed in the inner wall of the piston cavity or the driving 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 part 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 at the annular groove bottom of the limiting groove, and a gap is reserved between the groove bottom and the end face of the limiting piston extending into the limiting groove;
the oil cavity is arranged in the rocker arm, is filled with hydraulic oil and is provided with an oil hole communicated with the annular groove;
and the oil feeding power part is connected with the oil cavity and is used for feeding hydraulic oil into the annular groove through the oil hole.
Through 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 is tightly abutted 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 the hydraulic oil in the oil cavity is sent into the annular groove by the oil sending power part, the hydraulic oil extrudes the limiting piston to enable the limiting piston to be gradually pushed out of the limiting groove, the elastic part is compressed to finally enable the limiting piston to be completely pushed out of the limiting groove and to be retracted into the installation cavity, the limiting position of the driving piston in the piston cavity is relieved, the driving piston can be abutted against the swing arm in the lifting process of the swing arm, relative rotation is generated between the swing arm and the swing arm due to the fact that the driving piston is in a movable state, the driving piston is gradually pushed to the bottom of the piston cavity, namely the abutting part is abutted, at the moment, the swing arm and the swing arm synchronously move in the process of subsequently pressing the valve bridge assembly, and the valve bridge assembly is enabled to have the second type of lift length. Finally, the movement control of the limiting piston is further converted into the opening and closing of the oil delivery power part, and the switching of two lift states of the valve bridge assembly can be rapidly controlled.
In some embodiments, the blocking 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 abutting part can be quickly discharged through the air holes when the driving piston moves to the abutting part, meanwhile, hydraulic oil in the limiting groove can be quickly and accurately close to or far away from the abutting part when being attached to the inner wall of the piston cavity and finally squeezed between the driving piston and the abutting part, the influence of leaked hydraulic oil on the driving piston is avoided, and the movement accuracy of the valve bridge assembly is guaranteed.
In some embodiments, the lift adjustment assembly further comprises:
and the piston resetting 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.
According to the scheme, after the driving piston drives the swing arm to synchronously press down the valve bridge assembly with the rocker arm under the action of the first limiting part, in the lifting process of the valve bridge assembly, the swing arm is relatively far away from the rocker arm in the process, at the moment, the piston resetting part can push the driving piston to move from the first limiting part to the second limiting part, and when the lift does not need to be changed, in the subsequent stamping process of the valve bridge assembly, the rocker arm still pushes the driving piston to compress the piston resetting part, so that the driving piston moves to the first limiting part to act; and when the lift of the valve bridge assembly needs to be changed subsequently, the second limiting part can be controlled to be combined with the driving piston, so that the change of the stamping lift of the subsequent valve bridge assembly is realized.
In some embodiments, the swing arm is provided with a contact portion for contacting with an end of the driving member, and the contact portion or an end surface of the driving member is provided with a contact curved surface to realize stable interference between the contact portion and the end surface of the driving member.
Through the scheme, due to the fact that errors in size or assembly positions exist in the actual installation of the swing arm and the rocker arm, the contact part of the swing arm and the end part of the upper driving piece of the rocker arm are difficult to realize plane-to-plane integral fit and collision, the abutting direction between the swing arm and the upper driving piece of the rocker arm is likely to deviate after one of the swing arm and the upper driving piece of the rocker arm is deflected, and then larger contact stress is generated, but plane-to-curved surface contact is realized through the arrangement of the contact curved surface, the vertical collision state is continuously kept after the contact, and the stable collision between the swing arm and the rocker arm is guaranteed;
meanwhile, when the lift changes, the end part of the driving piece slides and rotates relative to the contact part, and the contact curved surface can ensure the abutting effect of the end part of the driving piece and the contact part when the end part of the driving piece and the contact part move relative to each other, so that the change of the lift can be smoothly carried out.
In some embodiments, the driving member is in transmission connection with the swing arm through a transmission member, and two ends of the transmission member are respectively in rotation connection with an end portion of the driving member and the swing arm.
Through above-mentioned scheme, carry out the transmission through the driving medium 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 the 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 the elephant foot.
Through above-mentioned scheme, realize the swing arm and be connected with the transmission of valve bridge assembly, the swing arm can rotate relative valve bridge assembly's tip when driving valve bridge assembly and reciprocate, and then the motion of swing arm can effectively cooperate the rocking arm, and the detachable mounting means of adjusting bolt also can dismantle maintenance or change when follow-up needs.
The beneficial effect that technical scheme that this application provided brought includes:
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 the rocker arm, the space at the rocker arm is fully utilized, the peripheral space of a valve bridge assembly is not utilized, the limitation to different types of valve bridge assemblies is avoided, and the transmission mode is lever transmission, in the scheme, after the cam structure moves for a certain distance, the cam structure is fed back to the lift of the valve bridge assembly according to a certain proportion, and then the position change of a driving part is fed back to the change of the valve bridge assembly lift according to a corresponding proportion, so that the valve bridge assembly can realize larger lift change in a limited space, compared with the corresponding relation that the space position adjustment of an adjusting structure in the valve bridge structure with variable height is consistent with the height change of the valve bridge lift, the scheme has stronger adaptability and saves more space, and the response is quicker during operation, and the driving and the adjustment of the lift of the engine valve axle assembly are facilitated according to the requirements of users.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a rocker arm assembly in a first lift state;
FIG. 2 is a schematic diagram 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 according to various embodiments;
FIG. 8 is a vertical cross-sectional view of a rocker arm assembly according to various embodiments.
In the figure:
1. a rocker arm; 10. a rocker roller;
2. a cam structure;
3. swinging arms; 30. a contact portion; 31. adjusting the bolt; 32. elephant feet;
4. a valve bridge assembly;
5. a drive member; 50. a drive piston; 500. a limiting groove;
60. a first limit piece; 600. a resisting part; 601. a piston cavity; 602. a mounting cavity; 603. air holes;
61. a second limiting member; 610. a limit piston;
62. a drive structure; 620. an elastic member; 621. an annular groove; 622. an oil chamber; 623. an oil hole;
63. a piston return;
7. a transmission member; 70. and a lubricating oil channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a rocker arm assembly with a variable valve lift, which can 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.
Referring to fig. 1 and 2, a variable valve lift rocker arm 1 assembly includes:
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 rotatably connected with the rocker arm 1, the rotating axial direction of the swing arm is parallel to the rotating axial direction of the rocker arm 1, and the other end of the swing arm is in transmission connection with the valve bridge assembly 4;
the driving part 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 tightly propped against the rocker arm 1 when the rocker arm 1 rotates and drive the swing arm 3 to move; and the number of the first and second groups,
and the lift adjusting assembly is arranged on the rocker arm 1 and can limit the position of the driving piece 5 at least two positions (two positions are positions of the driving piece 5 in fig. 1 and 2 respectively) so as to change the relative angle between the swing arm 3 and the rocker arm 1 when the driving piece 5 abuts against the swing arm 3.
The rocker arm 1 is rotatably disposed in the vehicle body through a rocker arm shaft (not shown in the figure), the swing arm 3 is rotatably connected with the rocker arm 1 through a pin (in other embodiments, the rocker arm shaft can be used as a pin to realize the rotatable connection of the rocker arm and the swing arm), and the other end of the swing arm 3 is rotatably connected with the top end of the valve bridge assembly 4 in a ball hinge manner. Furthermore, when the cam structure 2 drives the rocker arm 1 to move, a relative rotation trend is generated between the swing arm 3 and the rocker arm 1, and the driving member 5 positioned on the rocker arm 1 can be abutted against the swing arm 3 to realize the lever-type lifting movement (as shown in any state of fig. 1 or fig. 2) of the valve bridge assembly 4, and in the process, the position of the driving member 5 on the rocker arm 1 when the driving member 5 is abutted against the swing arm 3 can be changed through the lift adjusting component (the position of the driving member 5 is changed from the position in fig. 1 to the position in fig. 2), so that the relative angle between the swing arm 3 and the rocker arm 1 is changed when the swing arm 3 is abutted against the rocker arm 1, that is, in the process that the cam structure 2 drives the rocker arm 1 to move from the initial position to the abutment against the swing arm 3, the rotation angle of the cam structure 2 is changed, and the movement distance of the rocker arm 1 driving the valve bridge assembly 4 is adjusted, i.e., the change in the valve lift.
The arrangement is that the structure for adjusting the valve lift is arranged on the rocker arm 1, the space at the rocker arm 1 is fully utilized, the space at the periphery of the valve bridge assembly 4 is not utilized, the limitation to different types of valve bridge assemblies 4 is avoided, and the transmission mode is lever transmission, the cam structure 2 in the scheme feeds back the lift of the valve bridge assembly 4 in a certain proportion after moving for a certain distance, and then the position change of the driving part 5 feeds back 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 the limited space, compared with the corresponding relation that the space position adjustment of the adjusting structure in the valve bridge structure with variable height is consistent with the height change of the valve bridge lift, the scheme has stronger adaptability, saves more space and has quicker response during operation, the lift of the engine valve bridge assembly 4 can be driven and adjusted according to the requirements of users;
meanwhile, according to the engine requirements of different vehicle types, the length of force arms on two sides of a lever can be adjusted through a lever type transmission structure of the rocker arm 1-the swing arm 3 in a mode of adjusting the positions of hinged shafts of the rocker arm 1 and the swing arm 3, and the corresponding proportion of the cam structure 2 between the moving distance of the driving rocker arm 1 and the moving distance of the driving valve bridge assembly 4 is adjusted. For example, the cam structure 2 drives the rocker arm 1 to move a larger distance when driving the valve bridge assembly 4 to move a small distance, or vice versa; the cam structure 2 may also be made to lift the rocker arm 1 by a distance equal to the distance the valve bridge assembly 4 moves. The scheme can be more effectively applied to vehicles of different types.
Alternatively, with reference to fig. 3-4, the drive member 5 comprises a drive piston 50 provided on the rocker arm 1,
the lift adjustment assembly includes:
a first stopper 60 provided on the rocker arm 1 on a side of the drive piston 50 away from the swing arm 3, and capable of stopping the drive piston 50 moving thereto;
and a second limiting member 61 movably disposed between the swing arm 3 and the first limiting member 60, and connected to a driving structure 62, wherein the driving structure 62 can drive the second limiting member 61 to couple with the driving piston 50 and limit the driving piston 50, or drive the second limiting member 61 to release the coupling with the driving piston 50.
With such an arrangement, whether the second limiting member 61 is combined with the driving piston 50 or not is utilized to adjust the position of the driving piston 50 when the driving piston 50 abuts against the swing arm 3, that is, the driving piston 50 is located at the position far away from the first limiting member 60 of the swing arm 3 or the position close to the second limiting member 61 of the swing arm 3, so that the position adjustment is converted into the combination relationship between the second limiting member 61 and the driving piston 50, and further, the realization and the control are easier.
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 with the rocker arm 1 and drive the swing arm 3 to rotate when driving the rocker arm 1 to rotate, and further cannot drive the valve bridge assembly 4, so that the cylinder deactivation requirement of the engine is realized, the rocker arm assembly in the present embodiment can switch between the two states of starting and closing the engine, and further can realize other related operations, such as the braking of a high-power engine.
Optionally, the first limiting member 60 is a stopping portion 600 disposed on the rocker arm 1, so as to stop and limit the driving member 5 on a side of the driving member 5 away from the swing arm 3.
Wherein, the stop part 600 is integrated into one piece on the rocker arm 1 in this embodiment, so that the setting is more convenient and quicker, and the stability is better, and in other embodiments, the connection setting can be performed by other modes such as a detachable mode.
With reference to fig. 1 and 2, after the second limiting member 61 is disengaged from the driving piston 50 for limiting, because 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 by the cam structure 2 to move, the opposite rocker arm 3 rotates, the rocker arm 3 rotating to the driving piston 50 will collide with the end of the driving piston 50, and further the driving piston 50 is pushed to move towards the abutting portion 600, and finally after the driving piston 50 collides with the abutting portion 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 offset 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 part 600 just can realize through contradicting spacing, and then make first locating part 60 only need fix on rocking arm 1 can, easily realize, and then fully reduce the structural complexity of this scheme.
Optionally, referring to fig. 3 and 4, a piston cavity 601 for movably mounting the driving piston 50 is disposed on the rocker arm 1, one end of the piston cavity 601, which is close to the swing arm 3, is open, and the inner wall of the cavity bottom, which is far away from the swing arm 3, forms the resisting portion 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;
a limit groove 500 which is matched and connected with the limit piston 610 is formed in the drive piston 50 or the piston cavity 601;
the driving structure 62 controls the end of the limiting piston 610 to extend into or separate from the limiting groove 500.
Set up like this, spacing piston 610 as second locating part 61 can be pegged graft with drive piston 50 and combine or take out and break away from under drive structure 62 effect, the realization is with second locating part 61 and drive piston 50's combination or break away from the flexible setting of changing into spacing piston 610, the function from more complicated further changes into simpler direct operating mode, and then can get off the function effect of realizing second locating part 61 through setting up simpler structure, realize the lift change of valve bridge assembly 4 promptly, and has obvious practical meaning.
In some embodiments, the limiting groove 500 is annularly disposed around the outer wall of the driving piston 50, an installation cavity 602 for installing the limiting piston 610 is opened on 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 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;
the annular groove 621 is wound on the annular groove bottom of the limiting groove 500, and a gap is reserved between the groove bottom and the end face of the limiting piston 610 extending into the limiting groove 500;
an oil chamber 622 opened in the rocker arm 1 and filled with hydraulic oil, and 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.
In some embodiments, the oil chamber 622 may be directly utilized with 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 in a compressed arrangement in the mounting cavity 602, so that it may continuously tend to push the stopper piston 610 out of the mounting cavity 602. The annular groove 621 positioned at the bottom of the limiting groove 500 is a sinking groove with the groove width smaller than that of the limiting groove 500, so that the limiting piston 610 extending into the limiting 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 limiting 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 then when the subsequent cam structure 2 drives the rocker arm 1 to move, the driving piston 50 will abut against the rocker arm 3 under the limitation of the limiting piston 610, so as to drive the valve bridge assembly 4 to move on the first lift length;
referring to fig. 5 and 6, when the lift of the valve bridge assembly 4 needs to be changed, after the hydraulic oil in the oil chamber 622 is fed into the annular groove 621 by the oil feeding power member, 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 the elastic member 620 is compressed, so that the limiting piston 610 is completely pushed out of the limiting groove 500 and retracted into the installation cavity 602, the driving piston 50 is released from limiting in the piston cavity 601, and further the driving piston 50 can be abutted against the swing arm 3 in the lifting process of the rocker arm 1, because the driving piston 50 is in a movable state, the rocker arm 1 and the swing arm 3 rotate relatively, the driving piston 50 is gradually pushed to the bottom of the piston cavity 601, i.e., at the abutting part 600, the driving piston 50 will be abutted against and blocked, and at this time the swing arm 3 and the rocker arm 1 will move synchronously in the subsequent process of pressing down the valve bridge assembly 4, movement of the valve bridge assembly 4 in the second lift is achieved.
By the arrangement, the movement control of the limiting piston 610 is further converted into the opening and closing of the oil delivery power part, and the switching of two lift states of the valve bridge assembly 4 can be quickly controlled.
In addition, referring to fig. 7, in other embodiments, the limiting groove 500 is circumferentially opened on the inner wall of the piston cavity 601, the mounting cavity 602 is opened on the driving piston 50, and the limiting piston 610 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 opened at the bottom of the limiting groove 500, the oil cavity 622 is still disposed in 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 stopping portion 600 is provided with an air hole 603 for communicating the oil cavity 622 with the outside.
Due to the arrangement, when the driving piston 50 moves towards the abutting part 600, air between the driving piston and the abutting part can be quickly discharged through the air hole 603, meanwhile, hydraulic oil in the limiting groove 500 can be discharged through the air hole 603 when being attached to the inner wall of the piston cavity 601 and finally squeezed between the driving piston 50 and the abutting part 600, the driving piston 50 can be quickly and accurately close to or far away from the abutting 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 guaranteed.
Optionally, referring to fig. 1 and 2, the lift adjustment assembly further comprises:
the piston resetting member 63 is elastically connected between the driving piston 50 and the first limiting member 60, and is configured to drive the driving piston 50 to move from the first limiting member 60 to the second limiting member 61.
In the embodiment, the piston returning element 63 is a return spring, and two ends of the return spring respectively abut against the driving piston 50 and the abutting portion 600 at the bottom of the piston cavity 601. Meanwhile, the end of the driving piston 50 is provided with a sleeve portion for the return spring to be sleeved with, or an extending cavity for the return spring to extend into, which is preferably the sleeve portion in this embodiment, so as to realize that the return spring and the driving piston 50 can be staggered on the end, thereby ensuring that the driving piston 50 can successfully abut against the abutting portion 600 in the moving process.
According to the arrangement, after the driving piston 50 drives the swing arm 3 to synchronously press down the valve bridge assembly 4 with the rocker arm 1 under the action of the first limiting part 60, in the lifting process of the valve bridge assembly 4, the swing arm 3 is relatively far away from the rocker arm 1 in the process, at the moment, the piston resetting part 63 can push the driving piston 50 to move from the first limiting part 60 to the second limiting part 61, and when the lift does not need to be changed and in the subsequent stamping process of the valve bridge assembly 4, the rocker arm 1 still pushes the driving piston 50 to compress the piston resetting part 63, so that the driving piston 50 moves to the first limiting part 60 to act; and when the lift of the valve bridge assembly 4 needs to be changed subsequently, the second limiting part 61 can be controlled to be combined with the driving piston 50, so that the change of the stamping lift of the subsequent valve bridge assembly 4 is realized.
Optionally, a contact portion 30 for contacting with the end of the driving member 5 is disposed on the swing arm 3, and a contact curved surface is disposed on the contact portion 30 or the end surface of the driving member 5, so as to realize stable collision between the contact portion 30 and the end surface of the driving member 5.
Due to the arrangement, in the actual installation process of the swing arm 3 and the swing arm 1, due to the fact that errors in size or assembly positions exist, the contact part 30 of the swing arm 3 and the end part of the driving part 5 on the swing arm 1 are difficult to realize plane-to-plane integral attaching and abutting, the abutting direction between the two is likely to deviate after one position is deflected, and then larger contact stress is generated, but plane-to-curved surface contact between the two is realized through the arrangement of a contact curved surface, and a vertical abutting state is continuously kept after the contact, so that the stable abutting between the two is guaranteed;
meanwhile, when the lift is changed, the end part of the driving element 5 and the contact part 30 slide relatively, and the contact curved surface can ensure the abutting effect of the two when the two move relatively, so that the change of the lift 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 both ends of the transmission member 7 are respectively in rotation connection with an end portion of the driving member 5 and the swing arm 3.
The driving part 7 is a connection fork, two ends of which are respectively connected with the swing arm 3 and the end part of the driving piston 50, and the connection fork is in ball-hinged movable connection with the end part of the driving piston 50 and is rotatably connected with the swing arm 3 through a pin shaft. Meanwhile, inside the driving piston 50, a lubricating oil passage 70 is formed between the limiting groove 500 and the connecting fork, so that hydraulic oil in the limiting groove 500 can enter the space between the end of the connecting fork and the driving piston 50 through the lubricating oil passage 70 to form an automatic lubricating effect.
Set up like this, carry out the transmission through driving medium 7 between driving piece 5 and the swing arm 3 and be connected, realize avoiding hard contact between the two, and then avoid both to produce great friction loss at the relative pivoted in-process when the contact, realize effectively improving the 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.
Wherein, be equipped with the installation shaft hole that supplies adjusting bolt 31 to pass on swing arm 3 to have adjusting nut at end connection after the swing arm 3 is passed on adjusting bolt 31 top, realize being fixed in adjusting bolt 31 dismantlement formula on swing arm 3, realize ball articulated swing joint through elephant foot 32 between adjusting bolt 31's bottom and the valve bridge assembly 4 top.
Set up like this, realize that swing arm 3 is connected with the transmission of valve bridge assembly 4, swing arm 3 can rotate relative valve bridge assembly 4's tip when driving valve bridge assembly 4 and reciprocate, and then swing arm 3 can effectively cooperate the motion of rocking arm 1, and the detachable mounting means of adjusting bolt 31 also can dismantle maintenance or change when 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 forward, and correspondingly, the reverse direction of "Y" represents rearward; the forward direction of "Z" represents the upward direction, and correspondingly, the reverse direction of "Z" represents the downward direction, and the directions or positional relationships indicated by the terms "X", "Y", "Z", etc. are based on the directions or positional relationships shown in the drawings of the specification, and are only for convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular direction, be constructed and operated in a particular direction, and thus 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 terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present 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 (10)

1. A variable valve lift rocker assembly, 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 rotatably connected with the rocker arm (1), the rotating axial direction of the swing arm is parallel to the rotating axial direction of the rocker arm (1), and the other end of the swing arm is rotatably 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 tightly abutted and drive the swing arm (3) to move when the rocker arm (1) rotates; and the number of the first and second groups,
the lift adjusting assembly is arranged on the rocker arm (1) and can limit the position of the driving piece (5) at least two positions so as to change the relative angle between the swing arm (3) and the rocker arm (1) when the driving piece (5) abuts against the swing arm (3).
2. The variable valve lift rocker arm assembly of claim 1, wherein the driver (5) comprises a drive piston (50) provided on the rocker arm (1);
the lift adjustment assembly includes:
the first limiting piece (60) is arranged on the rocker arm (1) on one side, away from the swing arm (3), of the driving piston (50) so as to limit the driving piston (50) moving to the position;
and the second limiting part (61) is movably arranged between the swing arm (3) and the first limiting part (60) and is connected with a driving structure (62), and the driving structure (62) can drive the second limiting part (61) to be combined with the driving piston (50) and limit the driving piston (50), or drive the second limiting part (61) to be released from being combined with the driving piston (50) for limiting.
3. The rocker arm assembly with variable valve lift according to claim 2, wherein the first limiting member (60) is a stop (600) provided on the rocker arm (1) for stopping and limiting the driving member (5) on a side of the driving member (5) away from the swing arm (3).
4. The rocker arm assembly with variable valve lift according to claim 3, wherein a piston cavity (601) for movably mounting the driving piston (50) is formed in the rocker arm (1), one end of the piston cavity (601) close to the swing arm (3) is open, and the inner wall of the cavity bottom far away from the swing arm (3) forms the abutting part (600);
the second limiting piece (61) is a limiting piston (610) movably arranged on the inner wall of the piston cavity (601) or on the driving piston (50);
a limit groove (500) matched and connected with the limit piston (610) is formed in the drive 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).
5. The rocker arm assembly with the variable valve lift according to claim 4, wherein the limiting groove (500) is annularly arranged around 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 installation cavity (602), and the elastic piece can drive the end part of the limiting piston (610) to extend out of the installation cavity (602);
the annular groove (621) is wound on the annular groove bottom of the limiting groove (500), and a gap is reserved between the groove bottom and the end face of the limiting piston (610) extending into the limiting groove (500);
an oil chamber (622) which is arranged in the rocker arm (1) and is filled with hydraulic oil, and is provided with an oil hole (623) communicated 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 an oil hole (623).
6. The rocker arm assembly with variable valve lift of claim 4, wherein the stopper (600) is provided with an air hole (603) communicating the oil chamber (622) with the outside.
7. The variable valve lift rocker arm assembly of claim 2 wherein the lift adjustment assembly further comprises:
and the piston resetting piece (63) is elastically connected between the driving piston (50) and the first limiting piece (60) and is used for driving the driving piston (50) to move from the first limiting piece (60) to the second limiting piece (61).
8. The rocker arm assembly with variable valve lift according to claim 1, wherein 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 to realize stable interference between the contact portion (30) and the end surface of the driving member (5).
9. The rocker arm assembly with variable valve lift according to claim 1, wherein 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 rotation connection with an end of the driving member (5) and the swing arm (3).
10. 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 an elephant foot (32).
CN202111168809.1A 2021-09-30 2021-09-30 Rocker arm assembly with variable valve lift Active CN113931712B (en)

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