CN213450537U

CN213450537U - Variable valve mechanism of engine

Info

Publication number: CN213450537U
Application number: CN202022604111.7U
Authority: CN
Inventors: 宋爽
Original assignee: Tianjin Jinyu Power Technology Co ltd
Current assignee: Tianjin Jinyu Power Technology Co ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-06-15
Anticipated expiration: 2030-11-12

Abstract

The utility model belongs to the technical field of engine valve mechanism, especially, be a variable valve mechanism of engine, including first rocking arm and the second rocking arm of split type design, first rocking arm and second rocking arm assemble on the rocking arm axle jointly, wherein first rocking arm with the second rocking arm is the matching part, seted up oil gallery and inlet port on the rocking arm axle respectively, the top of first rocking arm has seted up internal slideway, sliding mounting has little piston in the internal slideway, and little piston and internal slideway are the matching part each other, the afterbody of internal slideway installs the bolt, and the internal slideway passes through the bolt is sealed; the split rocker arm is designed according to the scheme, a slide valve control system is formed by a piston mechanism and a rocker arm shaft which are designed in the rocker arm, and the oil discharge passage of the rocker arm shaft is controlled by using the electromagnetic valve, so that the rocker arm ratio is variable in two stages, and the engine valve two-stage variable mechanism is further realized.

Description

Variable valve mechanism of engine

Technical Field

The utility model belongs to the technical field of the engine valve mechanism, concretely relates to variable valve mechanism of engine.

Background

The valve mechanism of engine is to open and close the inlet and outlet valves of each cylinder at regular time according to the requirement of working cycle and ignition sequence in each cylinder of the engine, so that the fresh combustible mixed gas or air can enter the cylinder in time, the waste gas can be discharged from the cylinder in time, and the valve is closed to ensure the sealing of the combustion chamber in the compression and work process.

With the development of engine technology, the demand for adjusting the valve timing is higher and higher, the performance and the emission of the engine can be improved by changing the inlet valve of the engine, and the heat management of the engine can be well performed by changing the exhaust valve.

SUMMERY OF THE UTILITY MODEL

The utility model provides a variable valve mechanism of engine to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a variable valve mechanism of an engine comprises a first rocker arm and a second rocker arm which are designed in a split mode, wherein the first rocker arm and the second rocker arm are assembled on a rocker arm shaft together, the first rocker arm and the rocker arm shaft are mutually coupled parts, an oil return hole and an oil inlet hole are formed in the rocker arm shaft respectively, an internal slide way is formed in the top end of the first rocker arm, a small piston is arranged in the internal slide way in a sliding mode, the small piston and the internal slide way are mutually coupled parts, a bolt is installed at the tail part of the internal slide way, the internal slide way is sealed through the bolt, a connector is elastically connected to the front end of the small piston and is installed on the second rocker arm in a clamping mode, an oil return channel and an oil inlet channel which are matched with the oil return hole and the oil inlet hole respectively are formed in the first rocker arm, an oil inlet channel is formed in the position, corresponding, the oil inlet channel is communicated with the oil inlet channel and the oil inlet hole, a check valve is arranged in the small piston and is formed by the connector in the direction of the bolt, a pressing rod is fixedly arranged at one end, close to the connector, of the second rocker arm, a valve bridge is hinged to the bottom end of the pressing rod, a valve spring is arranged below the valve bridge, a rocker arm shaft roller is rotatably arranged at the other end of the second rocker arm, a camshaft transmission gear connected with an external driving mechanism is arranged below the rocker arm shaft roller, a camshaft matched with the rocker arm shaft roller is fixedly arranged on the camshaft transmission gear, and the camshaft transmission gear rotate coaxially.

Preferably, an oil cavity communicated with the oil inlet duct is formed between the small piston and the bolt.

Preferably, the check valve comprises a small steel ball and a return spring, the return spring is fixedly installed in an oil cavity of the small piston, the small steel ball is movably installed in the oil cavity, and the small steel ball is elastically connected with the small piston through the return spring.

Preferably, the elastic movement of the small steel ball realizes the unidirectional opening of the one-way valve from left to right.

Preferably, a spring is arranged between the small piston and the connector, and two ends of the spring are respectively fixedly connected with the small piston and the connector.

Preferably, the second rocker arm is provided with a fabrication hole communicated with the oil inlet channel.

Preferably, an oil drainage hole communicated with the oil cavity is formed in the bolt, and the oil drainage hole is communicated with the oil return channel.

Preferably, a ball connector is fixedly arranged at the joint of the pressure lever and the valve bridge, and the pressure lever and the valve bridge are universally hinged through the ball connector.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the split rocker arm is designed according to the scheme, a slide valve control system is formed by a piston mechanism and a rocker arm shaft which are designed in the rocker arm, and the oil discharge passage of the rocker arm shaft is controlled by using the electromagnetic valve, so that the rocker arm ratio is variable in two stages, and the engine valve two-stage variable mechanism is further realized.

2. The scheme has compact structure, and the whole valve variable mechanism is mainly concentrated on the rocker arm, so that the whole change of the engine is small.

3. The rocker arm and the rocker arm shaft form a sliding valve control mechanism through the integral design, the integral oil inlet and oil drainage are realized by mechanical logic, and the robustness and reliability of the system are ensured.

4. The whole design can ensure that the pressure oil of the engine lubricating system is connected into the oil inlet channel of the rocker shaft to finish oil filling, an oil pump is not needed, and the cost and the energy consumption can be reduced.

5. The system can realize two-stage variable rocker arm ratio, and is favorable for improving the performance of the engine under different working conditions.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged schematic structural view of the first rocker arm and the second rocker arm in the present invention;

fig. 3 shows the early closing profile and the normal closing profile of the intake valve of the present invention.

In the figure: 1. a camshaft drive gear; 2. a camshaft; 3. rocker shaft rollers; 4. a first rocker arm; 5. an oil return hole; 6. an oil return passage; 7. a bolt; 8. an oil drainage duct; 9. a fabrication hole; 10. a return spring; 11. a small steel ball; 12. a spring; 13. a connector; 14. a small piston; 15. an oil inlet duct; 16. an oil inlet channel; 17. an oil inlet hole; 18. a second rocker arm; 19. a pressure lever; 20. a rocker shaft; 21. a valve bridge; 22. a valve spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides the following technical solutions: a variable valve mechanism of an engine comprises a first rocker arm 4 and a second rocker arm 18 which are designed in a split mode, wherein the first rocker arm 4 and the second rocker arm 18 are assembled on a rocker shaft 20 together, the first rocker arm 4 and the rocker shaft 20 are matching parts, an oil return hole 5 and an oil inlet hole 17 are formed in the rocker shaft 20 respectively, an internal slide way is formed in the top end of the first rocker arm 4, a small piston 14 is installed in the internal slide way in a sliding mode, the small piston 14 and the internal slide way are matching parts, a bolt 7 is installed at the tail of the internal slide way and sealed through the bolt 7, a connector 13 is elastically connected to the front end of the small piston 14, the connector 13 is installed on the second rocker arm 18 in a clamping mode, an oil return channel 6 and an oil inlet channel 16 which are matched with the oil return hole 5 and the oil inlet hole 17 respectively are formed in the first rocker arm 4, an oil inlet channel 15 is formed in the position, corresponding to the oil inlet channel 16, the, a one-way valve which is arranged from the connecting head 13 to the bolt 7 is arranged inside the small piston 14, a pressure rod 19 is fixedly arranged at one end of the second rocker arm 18 close to the connecting head 13, a valve bridge 21 is hinged at the bottom end of the pressure rod 19, a valve spring 22 is arranged below the valve bridge 21, a rocker shaft roller 3 is rotatably arranged at the other end of the second rocker arm 18, a camshaft transmission gear 1 connected with an external driving mechanism is arranged below the rocker shaft roller 3, a camshaft 2 matched with the rocker shaft roller 3 is fixedly arranged on the camshaft transmission gear 1, the camshaft 2 and the camshaft transmission gear 1 rotate coaxially, an oil cavity communicated with an oil inlet channel 15 is arranged between the small piston 14 and the bolt 7, the one-way valve comprises a small steel ball 11 and a reset spring 10, the reset spring 10 is fixedly arranged in the oil cavity of the small piston 14, the small steel ball 11 is movably arranged in the oil cavity, and the, the elastic movement of the small steel ball 11 realizes that the one-way valve is opened in one way from left to right, a spring 12 is arranged between the small piston 14 and the connector 13, two ends of the spring 12 are respectively fixedly connected with the small piston 14 and the connector 13, an oil drainage hole 8 communicated with the oil cavity is formed in the bolt 7, the oil drainage hole 8 is communicated with the oil return channel 6, a ball connector is fixedly arranged at the joint of the pressure lever 19 and the valve bridge 21, and the pressure lever 19 is in universal hinge joint with the valve bridge 21 through the ball connector.

In the embodiment, the traditional engine integrated rocker arm is designed into a split type rocker arm and respectively consists of a first rocker arm 4 and a second rocker arm 18, the two parts are assembled on a rocker arm shaft 20 together, wherein the first rocker arm 4 and the rocker arm shaft 20 are mutually coupled parts, and an oil inlet 17 and an oil return hole 5 are respectively designed on the rocker arm shaft 20;

the top end of the first rocker arm 4 is provided with an internal slideway, a small piston 14 is arranged in the internal slideway and can slide, the small piston and the internal slideway are coupled, an oil inlet duct 15 is designed in the small piston 14, and a small steel ball 11 and a return spring 10 in the small piston 14 form a one-way valve mechanism;

the tail part of the slideway is provided with a hollow oil passing bolt 7 for sealing, and the bolt 7 is provided with an oil drainage hole passage 8;

based on the above design, the first rocker arm 4 constitutes a spool valve mechanism during movement relative to the rocker shaft 20.

The motion of the camshaft 2 is transmitted between the first rocker arm 4 and the second rocker arm 18 through the small piston 14 and the connecting head 13, when the first rocker arm 4 moves around the rocker shaft 20, the small piston 14 transmits acting force to the connecting head 13 to push the second rocker arm 18 to compress the valve spring 22 through the compression rod 19 and the valve bridge 21, and the spring 12 is externally designed on the small piston 14 and the connecting head 13.

When the engine runs, at the moment that the camshaft 2 is located at the base circle position relative to the rocker shaft roller 3, the first rocker arm 4 is not driven by the camshaft 2, the first rocker arm 4 and the second rocker arm 18 are both in a free state, at the moment, the spring 12 pushes the bottom of the small piston 14 to be attached to the rear end cover 7, a set gap exists between the small piston 14 and the connector 13, because in the free position, the oil inlet hole 17 on the camshaft 2 is sequentially communicated with the oil inlet channel 16 in the first rocker arm 4 and the oil inlet hole channel 15 on the small piston 14, and the oil return channel 6 on the first rocker arm 4 is separated from the oil return hole 5 on the rocker shaft 20;

because the oil inlet 17 is communicated with oil of a pressurizing machine for lubricating an engine system, the pressurizing machine oil can pass through the oil inlet channel 16, the oil inlet channel 15 presses the small steel ball 11 to move towards the direction of the return spring 10, so that the machine oil enters a gap between the small piston 14 and the bolt 7, the small piston 14 is pushed to slide towards the connector 13, the spring 12 is compressed, the gap between the small piston 14 and the connector 13 is eliminated, an oil cavity is formed between the small piston 14 and the bolt 7, and the two oil channels are still communicated although the oil inlet channel 15 and the oil inlet channel 16 can be displaced;

with the operation of an engine, the camshaft transmission gear 1 drives the camshaft 2 to rotate, the first rocker arm 4 is driven by the camshaft 2, and due to the action of the valve spring 22, the small piston 14 and the connector 13 generate interaction force, so that the pressure in an oil cavity between the small piston 14 and the bolt 7 is extruded, the pressure rise is larger than the system lubricating oil pressure, the small steel ball 11 is seated, the oil cavity is in a high-pressure closed state, and the volume of the oil in the oil cavity is superposed between the first rocker arm 4 and the second rocker arm 18 due to the very large volume elastic modulus of the lubricating oil;

as the camshaft 2 continues to rotate, the engine oil in the oil cavity between the small piston 14 and the bolt 7 is continuously pressurized, when the rocker shaft 20 drives the second rocker arm 18 to further move, the oil return channel 6 in the first rocker arm 4 is communicated with the oil return hole 5 on the rocker shaft 20, at the moment, if the oil return hole 5 on the rocker shaft 20 is unblocked, the engine oil in the oil cavity between the small piston 14 and the bolt 7 is instantly released, the reset force of the valve spring 22 forces the bottom of the small piston 14 to be attached to the rear end cover 7, so that the valve lift is instantly reduced, if the oil return hole 5 on the rocker shaft 20 is not unblocked at the moment, the engine oil in the oil cavity between the small piston 14 and the bolt 7 cannot be released, the reset force of the valve spring 22 cannot push the small piston 14 to slide towards the bolt 7, further, the valve lift does not change, and the engine oil in the oil cavity between the;

when the engine works for one cycle every time, when the camshaft is in a base circle position, oil is fed into an oil cavity between the small plunger 14 and the bolt 7 once, the oil cavity rotates along with the camshaft to be pressurized, the oil volume is superposed on the valve lift, whether the oil cavity is drained or not depends on whether the oil return hole 5 on the rocker arm shaft 20 is unblocked, if the oil is drained, the valve timing or the lift is adjusted once, and if the valve timing or the lift is not drained, the valve timing or the lift is kept unchanged, so that an external electromagnetic valve is required to be additionally arranged to control whether the rocker arm oil return hole 5 is unblocked to form a whole engine variable valve mechanism, and the on-off of the electromagnetic valve forms a variable control mechanism of the whole system;

the second rocker arm 18 is provided with a fabrication hole 9 communicated with the oil inlet channel 16, the fabrication hole 9 is formed by processing the oil channel 16, and the fabrication hole is closed after the processing is finished.

As shown in FIG. 3, the system controls whether the oil return hole 5 on the rocker arm shaft 20 is unblocked by using a solenoid valve, so that the rocker arm ratio of the engine can be changed in two stages, namely, a valve early closing mode A or a normal closing mode B can be realized.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 invention can be understood according to specific situations by those skilled in the art.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine variable valve mechanism characterized in that: the rocker arm assembly comprises a first rocker arm (4) and a second rocker arm (18) which are designed in a split mode, wherein the first rocker arm (4) and the second rocker arm (18) are assembled on a rocker arm shaft (20) together, the first rocker arm (4) and the rocker arm shaft (20) are coupled parts, and an oil return hole (5) and an oil inlet hole (17) are formed in the rocker arm shaft (20) respectively;

an internal slide way is formed in the top end of the first rocker arm (4), a small piston (14) is slidably mounted in the internal slide way, the small piston (14) and the internal slide way are coupled pieces, a bolt (7) is mounted at the tail of the internal slide way, the internal slide way is sealed through the bolt (7), a connector (13) is elastically connected to the front end of the small piston (14), and the connector (13) is clamped and mounted on the second rocker arm (18);

an oil return channel (6) and an oil inlet channel (16) which are respectively matched with the oil return hole (5) and the oil inlet hole (17) are formed in the first rocker arm (4), an oil inlet channel (15) is formed in the position, corresponding to the oil inlet channel (16), on the small piston (14), the oil inlet channel (15) is communicated with the oil inlet channel (16) and the oil inlet hole (17), and a one-way valve in the direction from the connector (13) to the bolt (7) is arranged inside the small piston (14);

one end, close to the connecting head (13), of the second rocker arm (18) is fixedly provided with a pressure lever (19), the bottom end of the pressure lever (19) is hinged to a valve bridge (21), a valve spring (22) is arranged below the valve bridge (21), the other end of the second rocker arm (18) is rotatably provided with a rocker arm shaft roller (3), a cam shaft transmission gear (1) connected with an external driving mechanism is arranged below the rocker arm shaft roller (3), a cam shaft (2) matched with the rocker arm shaft roller (3) is fixedly arranged on the cam shaft transmission gear (1), and the cam shaft (2) and the cam shaft transmission gear (1) rotate coaxially.

2. The engine variable valve mechanism according to claim 1, characterized in that: an oil cavity communicated with the oil inlet duct (15) is formed between the small piston (14) and the bolt (7).

3. The engine variable valve mechanism according to claim 2, characterized in that: the check valve comprises a small steel ball (11) and a return spring (10), the return spring (10) is fixedly installed in an oil cavity of the small piston (14), the small steel ball (11) is movably installed in the oil cavity, and the small steel ball (11) is elastically connected with the small piston (14) through the return spring (10).

4. The engine variable valve mechanism according to claim 3, characterized in that: the elastic movement of the small steel ball (11) realizes the unidirectional opening of the one-way valve from left to right.

5. The engine variable valve mechanism according to claim 1, characterized in that: little piston (14) with be equipped with spring (12) between connector (13), the both ends of spring (12) respectively with little piston (14), connector (13) fixed connection.

6. The engine variable valve mechanism according to claim 1, characterized in that: the second rocker arm (18) is provided with a fabrication hole (9) communicated with the oil inlet channel (16).

7. The engine variable valve mechanism according to claim 4, characterized in that: and an oil drainage hole (8) communicated with the oil cavity is formed in the bolt (7), and the oil drainage hole (8) is communicated with the oil return channel (6).

8. The engine variable valve mechanism according to claim 1, characterized in that: the joint of the pressure lever (19) and the valve bridge (21) is fixedly provided with a ball connector, and the pressure lever (19) and the valve bridge (21) are universally hinged through the ball connector.