CN110043340B

CN110043340B - VVL camshaft locking structure for internal combustion engine

Info

Publication number: CN110043340B
Application number: CN201910401212.3A
Authority: CN
Inventors: 王雷; 范礼; 丁万龙; 邵璠; 甄子源; 李振; 李海萌
Original assignee: Japhl Powertrain Systems Co ltd
Current assignee: Japhl Powertrain Systems Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-12-01
Anticipated expiration: 2039-05-15
Also published as: CN110043340A

Abstract

The invention provides a VVL camshaft locking structure for an internal combustion engine, which is applied to the technical field of internal combustion engine parts, wherein a camshaft mandrel (1) of the VVL camshaft locking structure for the internal combustion engine is provided with a positioning hole A (13), a locking spring A (14) is installed in the positioning hole A (13), a locking steel ball A (15) is connected with the locking spring A (14), the inner wall of a shaft sleeve A (2) is provided with a small cam positioning groove A (16) and a middle cam positioning groove A (17), and the joint position of the end surface of the shaft sleeve A (2) and the inner wall of the shaft sleeve A (2) is provided with a large cam positioning groove A (18). The internal combustion engine can be ensured to work under the optimal working condition all the time, the oil consumption is reduced, the performance is improved, and the energy is saved.

Description

VVL camshaft locking structure for internal combustion engine

Technical Field

The invention belongs to the technical field of internal combustion engine parts, and particularly relates to a VVL camshaft locking structure for an internal combustion engine.

Background

The internal combustion engine is used as the power machine with highest thermal efficiency and most extensive application at present, the total power generated by the internal combustion engine accounts for 90 percent of the total power of power devices used all over the world, and the internal combustion engine is a main consumption channel of petroleum energy in the world. With the increase of the quantity of automobiles, the petroleum consumption of the internal combustion engine is rapidly increased, the contradiction between supply and demand of petroleum is inevitably serious day by day, and the internal combustion engine is the largest source of atmospheric environment pollution, particularly urban atmospheric environment pollution, while a large amount of energy is consumed, so that the technology of innovating the internal combustion engine is significant for saving energy and reducing environmental pollution. On the other hand, with the stricter emission regulations of countries around the world, low emission and environmental protection become the precondition for the engine to enter the market, and become the important subject of the automobile industry at present. In a traditional internal combustion engine, the valve lift is fixed and unchanged, so that the valve lift is the same whether under a large-load working condition or a small-load working condition, energy waste is caused, and the heat efficiency is low. The variable valve lift mechanism in the prior art is complex in structure. And when the cam switching device works, the cam state switching cannot be accurately and effectively completed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the VVL camshaft locking structure for the internal combustion engine is simple in structure and low in cost, after the relative position of the camshaft and the shaft sleeve is adjusted by the engine, the locking and unlocking of the camshaft mandrel and the shaft sleeve can be reliably realized, the relative position of the camshaft and the shaft sleeve is reliably adjusted, the internal combustion engine can work under the best working condition constantly, the oil consumption is reduced, the performance is improved, and the energy is saved.

To solve the technical problems, the invention adopts the technical scheme that:

the invention relates to a VVL camshaft locking structure for an internal combustion engine, which comprises a camshaft mandrel, a shaft sleeve A, a shaft sleeve B and an electromagnetic valve, wherein a cam component A of the shaft sleeve A is provided with a large cam A, a middle cam A and a small cam A, a cam component B of the shaft sleeve B is provided with a large cam B, a middle cam B and a small cam B, the camshaft mandrel is provided with a positioning hole A, a locking spring A is arranged in the positioning hole A, a locking steel ball A is connected with the locking spring A, the inner wall of the shaft sleeve A is provided with a small cam positioning groove A and a middle cam positioning groove A, the joint position of the end surface of the shaft sleeve A and the inner wall of the shaft sleeve A is provided with a large cam positioning groove A, the camshaft mandrel is provided with a positioning hole B, a locking spring B is arranged in the positioning hole B, the locking steel ball B is connected with the locking spring B, the inner wall, and a large cam positioning groove B is arranged at the joint position of the end surface of the shaft sleeve B and the inner wall of the shaft sleeve B.

Camshaft dabber be close to left end tip position and set up locating hole A axle sleeve A and be close to left end inner wall position and set up along axle sleeve A inner wall a week concave yield's little cam constant head tank A, axle sleeve A inner wall position between little cam constant head tank A and the axle sleeve A left end sets up along axle sleeve A inner wall a week concave yield's well cam constant head tank A, axle sleeve A left end terminal surface and axle sleeve A inner wall joint position set up along the big cam constant head tank A on the inclined plane that axle sleeve A terminal surface a week was arranged.

Camshaft dabber be close to right-hand member end position and set up locating hole B axle sleeve B and be close to right-hand member inner wall position and set up along axle sleeve B inner wall a week concave yield's little cam positioning groove B, axle sleeve B inner wall position between little cam positioning groove B and the axle sleeve B right-hand member sets up along axle sleeve B inner wall a week concave yield's well cam positioning groove B, axle sleeve B right-hand member terminal surface and axle sleeve B inner wall joint position set up along axle sleeve B terminal surface a week arranged inclined plane big cam positioning groove B.

The electromagnetic valve is connected with a control component capable of controlling the telescopic switching of each valve element of the electromagnetic valve, when the electromagnetic valve drives the shaft sleeve A to be switched to a small cam state, the locking steel ball A is set to be in a structure capable of being clamped in the small cam positioning groove A, when the electromagnetic valve drives the shaft sleeve A to be switched to a middle cam state, the locking steel ball A is set to be in a structure capable of being clamped in the middle cam positioning groove A, and when the electromagnetic valve drives the shaft sleeve A to be switched to a large cam state, the locking steel ball A is set to be in a structure capable of being clamped in the.

The solenoid valve with can control the solenoid valve each case control unit that switches that stretches out and draws back be connected, the solenoid valve drive axle sleeve B when switching to the little cam state, locking steel ball B sets up to the structure that can clamp in little cam positioning groove A, when the solenoid valve drives axle sleeve B and switches to well cam state, locking steel ball B sets up to the structure that can clamp in well cam positioning groove B, when solenoid valve 4 drives axle sleeve B and switches to big cam state, locking steel ball B sets up to the structure that can clamp on big cam positioning groove B right side.

A plurality of positioning holes A are arranged along the left end of the camshaft mandrel in a clearance manner, each locking steel ball A is arranged to protrude out of one positioning hole A, and the center line of each positioning hole A is perpendicular to the center line of the camshaft mandrel; the positioning holes B are arranged along the camshaft mandrel close to the right end along the circumference of the camshaft mandrel in a clearance mode, each locking steel ball B is arranged to protrude out of one positioning hole B, and the center line of each positioning hole B is perpendicular to the center line of the camshaft mandrel.

Axle sleeve A include cam subassembly A and regulation subassembly A, set up guide groove A on the regulation subassembly A, guide groove A includes that guide groove A of curved surface shape leads I and guide groove A of curved surface shape leads II, axle sleeve B includes cam subassembly B and regulation subassembly B, sets up guide groove B on the regulation subassembly B, guide groove B includes that guide groove B of curved surface shape leads I and guide groove B of curved surface shape leads II.

Axle sleeve A's adjusting part A set up to be semicircular structure for along 1 radial direction on the camshaft dabber, adjusting part A includes adjusting part A terminal surface I and adjusting part A terminal surface II, guiding groove A guides face I and guiding groove A and guides face II to set up respectively to the structure that can extend to adjusting part A terminal surface II position from adjusting part A terminal surface I position.

Axle sleeve B's adjusting part B set up to be semicircular structure for along 1 radial direction on the camshaft dabber, adjusting part B includes adjusting part B terminal surface I and adjusting part B terminal surface II, guiding groove B guides face I and guiding groove B and guides face II to set up respectively to the structure that can extend to adjusting part B terminal surface II position from adjusting part B terminal surface I position.

1 surface of camshaft dabber be close to the left end position and set up the dabber tooth portion A that sets up along camshaft dabber axial, axle sleeve A inner wall sets up the axle sleeve A tooth portion that sets up along axle sleeve A inner wall axial, camshaft dabber surface is close to right-hand member position and sets up the dabber tooth portion B that sets up along camshaft dabber axial, axle sleeve B inner wall sets up the axle sleeve B tooth portion that sets up along axle sleeve B inner wall axial, axle sleeve A and axle sleeve B suit are when camshaft spindle respectively, axle sleeve A passes through axle sleeve A tooth portion and the epaxial dabber tooth portion A suit meshing of camshaft spindle, axle sleeve B passes through axle sleeve B tooth portion and the epaxial dabber tooth portion B suit meshing of camshaft spindle.

By adopting the technical scheme of the invention, the following beneficial effects can be obtained:

the VVL camshaft locking structure for the internal combustion engine can respectively realize the locking of the shaft sleeve A and the shaft sleeve B when the engine is in a small cam state, at the moment, when the shaft sleeve A is locked, the locking steel balls A are clamped in the small cam positioning grooves A under the action of the locking spring, when the shaft sleeve B is locked, the locking steel balls B are clamped in the small cam positioning grooves A under the action of the locking spring, and when the locking is required to be released, as long as the valve core drives the shaft sleeve to axially move relative to a camshaft mandrel, the force of the locking spring can be overcome, and the locking can be released. When the engine is in a medium cam state, the locking of the shaft sleeve A and the shaft sleeve B can be respectively realized, at the moment, when the shaft sleeve A is locked, the locking steel ball A is clamped in the medium cam positioning groove A under the action of the locking spring, when the shaft sleeve B is locked, the locking steel ball B is clamped in the medium cam positioning groove B under the action of the locking spring, and when the locking is required to be released, as long as the valve core drives the shaft sleeve to axially move relative to the camshaft mandrel, the force of the locking spring can be overcome, so that the locking is released. When the engine is in a large cam state, the shaft sleeve A and the shaft sleeve B can be locked respectively. When axle sleeve A locking this moment, locking steel ball A supports under the locking spring action and leans on laminating to big cam positioning groove A on, when axle sleeve B locking this moment, locking steel ball B supports under the locking spring action and leans on laminating to big cam positioning groove B on. When the locking is required to be released, the force of the locking spring can be overcome and the locking is released as long as the valve core drives the shaft sleeve to axially move relative to the camshaft mandrel. Therefore, the requirement for locking and limiting after the shaft sleeve moves can be reliably met, and the engine can always work under the best working condition. The VVL camshaft locking structure for the internal combustion engine is low in cost, can conveniently and reliably realize locking and unlocking of the camshaft mandrel and the shaft sleeve after the engine realizes adjustment of the relative position of the camshaft and the shaft sleeve, ensures that the relative position of the camshaft and the shaft sleeve is reliably adjusted, ensures that the internal combustion engine can work under the optimal working condition constantly, reduces oil consumption, improves performance and is beneficial to energy conservation.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic view of the entire structure of a VVL camshaft lock structure for an internal combustion engine according to the present invention;

fig. 2 is an exploded view of a VVL camshaft lock structure for an internal combustion engine according to the present invention;

fig. 3 is a partial sectional view schematically showing a sleeve a of a VVL camshaft lock structure for an internal combustion engine according to the present invention;

fig. 4 is a partial sectional structural view of a sleeve B of the VVL camshaft lock structure for an internal combustion engine according to the present invention;

in the drawings, the reference numbers are respectively: 1. a camshaft mandrel; 2. a shaft sleeve A; 3. a shaft sleeve B; 4. a plug; 5. a cam assembly A; 6. a large cam A; 7. a middle cam A; 8. a small cam A; 9. a cam assembly B; 10. a large cam B; 11. a middle cam B; 12. a small cam B; 13. positioning holes A; 14. a locking spring A; 15. locking the steel ball A; 16. a small cam locating slot A; 17. a middle cam positioning groove A; 18. a large cam locating slot A; 19. a positioning hole B; 20. a locking spring B; 21. locking the steel ball B; 22. a small cam locating slot B; 23. a middle cam positioning groove B; 24. a large cam positioning groove B; 25. an adjusting component A; 26. a guide groove A; 27. the guide groove A guides the surface I; 28. an adjusting component B; 29. a guide groove B; 30. the guide groove B guides the surface I; 31. a mandrel tooth part A; 32. the shaft sleeve A has tooth parts; 33. a mandrel tooth part B; 34. the shaft sleeve B is provided with a tooth part; 35. the guide groove A guides the surface II; 36. guide groove B guides surface II.

Detailed Description

The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:

as shown in fig. 1-4, the present invention is a VVL camshaft locking structure for an internal combustion engine, the VVL camshaft locking structure for an internal combustion engine includes a camshaft mandrel 1, a sleeve a2, a sleeve B3, and a solenoid valve, a large cam A6, a medium cam a7, and a small cam A8 are disposed on a cam assembly A5 of the sleeve a2, a large cam B10, a medium cam B11, and a small cam B12 are disposed on a cam assembly B9 of a sleeve B3, a positioning hole a13 is disposed on the camshaft mandrel 1, a locking spring a14 is disposed in a positioning hole a13, a locking steel ball a15 is connected with the locking spring a15, a small cam positioning groove a15 and a middle cam positioning groove a15 are disposed on an inner wall of the sleeve a15, a large cam positioning groove a15 is disposed at a junction position between an end face of the sleeve a15 and the inner wall of the sleeve a15, a positioning hole B15 is disposed with the positioning hole B15, a15 and the locking spring B15 is connected with the, the inner wall of the shaft sleeve B3 is provided with a small cam positioning groove B22 and a middle cam positioning groove B23, and the joint position of the end surface of the shaft sleeve B3 and the inner wall of the shaft sleeve B3 is provided with a large cam positioning groove B24. According to the VVL camshaft locking structure for the internal combustion engine, the camshaft mandrel 1 is movably sleeved with the shaft sleeve A and the shaft sleeve B, and the shaft sleeve A and the shaft sleeve B can only move axially relative to the camshaft mandrel 1. When the engine works, different valve cores of the electromagnetic valve are extended by controlling the electromagnetic valve through the control part, so that the electromagnetic valve can act on different guide surfaces of different guide grooves through extension of different valve cores, and force is applied to the shaft sleeve to drive the shaft sleeve to move leftwards or rightwards relative to the shaft of the camshaft mandrel. And after the shaft sleeve is moved leftwards or rightwards, the shaft sleeve needs to be locked. According to the structure, when the engine is in a small cam state, the shaft sleeve A and the shaft sleeve B can be locked respectively, the locking steel ball A is clamped into the small cam positioning groove A under the action of the locking spring when the shaft sleeve A is locked, the locking steel ball B is clamped into the small cam positioning groove A under the action of the locking spring when the shaft sleeve B is locked, and when the locking is required to be released, the force of the locking spring can be overcome as long as the valve core drives the shaft sleeve to axially move relative to the camshaft mandrel, so that the locking is released. When the engine is in a medium cam state, the locking of the shaft sleeve A and the shaft sleeve B can be respectively realized, at the moment, when the shaft sleeve A is locked, the locking steel ball A is clamped in the medium cam positioning groove A under the action of the locking spring, when the shaft sleeve B is locked, the locking steel ball B is clamped in the medium cam positioning groove B under the action of the locking spring, and when the locking is required to be released, as long as the valve core drives the shaft sleeve to axially move relative to the camshaft mandrel, the force of the locking spring can be overcome, so that the locking is released. When the engine is in a large cam state, the shaft sleeve A and the shaft sleeve B can be locked respectively. When axle sleeve A locking this moment, locking steel ball A supports under the locking spring action and leans on laminating to big cam positioning groove A on, when axle sleeve B locking this moment, locking steel ball B supports under the locking spring action and leans on laminating to big cam positioning groove B on. When the locking is required to be released, the force of the locking spring can be overcome as long as the valve core drives the shaft sleeve to move axially relative to the camshaft mandrel, so that the locking is released. Therefore, the requirement for locking and limiting after the shaft sleeve moves can be reliably met, and the engine can always work under the best working condition. According to the VVL camshaft locking structure for the internal combustion engine, after the engine realizes the adjustment of the relative position of the camshaft and the shaft sleeve, the locking and unlocking of the camshaft mandrel and the shaft sleeve can be conveniently and reliably realized, and the relative position adjustment of the camshaft and the shaft sleeve is ensured to be reliable, so that the internal combustion engine can work under the optimal working condition constantly, the oil consumption is reduced, the performance is improved, and the energy is saved.

Camshaft dabber 1 be close to left end tip position set up locating hole A13, axle sleeve A2 is close to left end inner wall position and sets up along axle sleeve A2 inner wall a16 of a week recess, axle sleeve A2 inner wall position between little cam positioning groove A16 and the axle sleeve A2 left end sets up along axle sleeve A2 inner wall a week recess well cam positioning groove A17, axle sleeve A2 left end terminal surface and axle sleeve A2 inner wall joint position set up along axle sleeve A2 terminal surface a week arrangement's the inclined plane big cam positioning groove A18. Above-mentioned structure, a plurality of locking steel balls A can the synchronization action, and every locating hole A central line is perpendicular with 1 central line of camshaft dabber for when every locking steel ball stretches out, can direct action realize reliable locking in a constant head tank that corresponds. And when the shaft sleeve is stressed and moves axially relative to the camshaft mandrel, the locking can be reliably and quickly released, and the working condition requirement of the engine is met.

Camshaft dabber 1 be close to right-hand member end position set up locating hole B19, axle sleeve B3 is close to right-hand member inner wall position and sets up along axle sleeve B3 inner wall a week recessed little cam constant head tank B22, axle sleeve B3 inner wall position between little cam constant head tank B22 and the axle sleeve B3 right-hand member sets up along axle sleeve B3 inner wall a week recessed well cam constant head tank B23, axle sleeve B3 right-hand member terminal surface and axle sleeve B3 inner wall joint position set up along axle sleeve B3 terminal surface a week the inclined plane of arranging big cam constant head tank B24. Above-mentioned structure, a plurality of locking steel balls B can the synchronization action, and every locating hole B central line is perpendicular with 1 central line of camshaft dabber for when every locking steel ball stretches out, can direct action realize reliable locking in a constant head tank that corresponds. And when the shaft sleeve is stressed and moves axially relative to the camshaft mandrel, the locking can be reliably and quickly released, and the working condition requirement of the engine is met.

The electromagnetic valve is connected with a control component capable of controlling the telescopic switching of each valve core of the electromagnetic valve, when the electromagnetic valve drives the shaft sleeve A2 to be switched to a small cam state, the locking steel ball A15 is arranged to be capable of being clamped in the small cam positioning groove A16, when the electromagnetic valve drives the shaft sleeve A2 to be switched to a middle cam state, the locking steel ball A15 is arranged to be capable of being clamped in the middle cam positioning groove A17, and when the electromagnetic valve drives the shaft sleeve A2 to be switched to a large cam state, the locking steel ball A15 is arranged to be capable of being clamped at the left side of the large cam positioning groove A18. With the structure, when the shaft sleeve A moves to different positions under the action of the valve core of the electromagnetic valve, the shaft sleeve A can be in different cam states. When the cam is in different cam states, the locking and unlocking of the shaft sleeve A can be conveniently and reliably realized, the engine can be rapidly switched under different working conditions, and the performance is improved.

The solenoid valve with can control the flexible control unit who switches of each case of solenoid valve be connected, the solenoid valve drive axle sleeve B3 when switching to little cam state, locking steel ball B21 sets up to the structure that can clamp in little cam positioning groove B22, when the solenoid valve drives axle sleeve B3 and switches to well cam state, locking steel ball B21 sets up to the structure that can clamp in well cam positioning groove B23, when the solenoid valve drives axle sleeve B3 and switches to big cam state, locking steel ball B21 sets up to the structure that can clamp on big cam positioning groove B24 right side. With the structure, when the shaft sleeve B moves to different positions under the action of the valve core of the electromagnetic valve, the shaft sleeve B can be in different cam states. When the cam is in different cam states, the shaft sleeve B can be conveniently and reliably locked and unlocked, the engine can be rapidly switched under different working conditions, and the performance is improved.

The positioning holes A13 are arranged along the left end of the camshaft mandrel 1 at positions close to the left end along the circumference of the camshaft mandrel 1 at intervals, each locking steel ball A15 is arranged to protrude out of one positioning hole A13, and the center line of each positioning hole A13 is perpendicular to the center line of the camshaft mandrel 1; the positioning holes B19 are arranged along the camshaft mandrel 1 at positions close to the right end along the camshaft mandrel 1 in a circle at intervals, each locking steel ball B21 is arranged to protrude out of one positioning hole B19, and the center line of each positioning hole B19 is perpendicular to the center line of the camshaft mandrel 1. Above-mentioned structure is provided with locking steel ball A in the different locating hole A respectively, like this, can follow different angles and realize the locking to axle sleeve A, is provided with locking steel ball B in the different locating hole B respectively, like this, can follow different angles and realize the locking to axle sleeve B, effectively improve the locking reliability.

The shaft sleeve A2 comprises a cam assembly A5 and an adjusting assembly A25, a guide groove A26 is arranged on the adjusting assembly A25, a guide groove A26 comprises a guide groove A guide surface I27 in a curved surface shape and a guide groove A guide surface II 35 in a curved surface shape, a shaft sleeve B3 comprises a cam assembly B9 and an adjusting assembly B28, a guide groove B29 is arranged on the adjusting assembly B28, and a guide groove B29 comprises a guide groove B guide surface I30 in a curved surface shape and a guide groove B guide surface II 36 in a curved surface shape.

The adjusting assembly A25 of the shaft sleeve A2 is arranged to be of a semicircular structure along the radial direction of the camshaft mandrel 1, the adjusting assembly A25 comprises an adjusting assembly A end face I and an adjusting assembly A end face II, and a guide groove A guide face I27 and a guide groove A guide face II 35 are respectively arranged to be of a structure capable of extending from the position of the adjusting assembly A end face I to the position of the adjusting assembly A end face II. The adjusting assembly B28 of the shaft sleeve B3 is arranged to be of a semicircular structure along the radial direction of the camshaft mandrel 1, the adjusting assembly B28 comprises an adjusting assembly B end face I and an adjusting assembly B end face II, and a guide groove B guide face I30 and a guide groove B guide face II 36 are respectively arranged to be of a structure capable of extending from the position of the adjusting assembly B end face I to the position of the adjusting assembly B end face II. Above-mentioned structure, when carrying out engine design or production, divide into camshaft dabber and axle sleeve A2, axle sleeve B3 with the part at camshaft position, set up the solenoid valve again, like this, when the different case of control unit control solenoid valve stretches out (when a case stretches out, another case has accomplished the shrink return), just can act on the guide face of guide groove A and guide groove B respectively, because the guide face is the curved surface shape, like this, the case just can promote axle sleeve A and axle sleeve B and realize axial displacement for the camshaft dabber. Therefore, the axial position of the cam on the shaft sleeve moves, and when the engine works, the switching of different cams can be realized, so that the engine works under the state of the small cam when the working condition of the small cam is needed, works under the state of the medium cam when the working condition of the medium cam is needed, and works under the state of the large cam when the working condition of the large cam is needed. Therefore, the ECU of the engine can be reliably controlled, and the engine can always work in the best tool. Therefore, the power is effectively improved, the oil consumption is reduced, the energy is saved, and the engine competitiveness is comprehensively improved.

Camshaft dabber 1 surface be close to the left end position and set up the dabber tooth portion A31 along camshaft dabber 1 axial setting, axle sleeve A2 inner wall sets up the axle sleeve A tooth portion 32 along axle sleeve A2 inner wall axial setting, camshaft dabber 1 surface is close to right-hand member position and sets up the dabber tooth portion B33 along camshaft dabber 1 axial setting, axle sleeve B3 inner wall sets up the axle sleeve B tooth portion 34 along axle sleeve B3 inner wall axial setting, when axle sleeve A2 and axle sleeve B3 suit are on camshaft dabber 1 respectively, axle sleeve A2 passes through axle sleeve A tooth portion 32 and camshaft dabber tooth portion A31 suit meshing on the camshaft dabber 1, axle sleeve B3 passes through axle sleeve B tooth portion 34 and camshaft dabber 1 on the dabber tooth portion B33 suit meshing. Above-mentioned structure, dabber tooth portion A31 and the cooperation of axle sleeve A tooth portion 32 for axle sleeve A can only be for camshaft dabber axial displacement, and can not rotate relatively, dabber tooth portion B33 and the cooperation of axle sleeve B tooth portion 34, make axle sleeve B can only be for camshaft dabber axial displacement, can not rotate relatively, thereby axle sleeve A and axle sleeve B reliably realize moving to the left or moving to the right when satisfying engine during operation when different cam states are adjusted.

In the structure of the invention, only one electromagnetic valve and two shaft sleeves are needed, the structure is simplified, and the mechanism has higher response speed, namely, the four cylinders are switched after the camshaft rotates for one circle.

The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.

Claims

1. A VVL camshaft locking structure for an internal combustion engine, characterized in that: the VVL camshaft locking structure for the internal combustion engine comprises a camshaft mandrel (1), a shaft sleeve A (2), a shaft sleeve B (3) and an electromagnetic valve, wherein a cam component A (5) of the shaft sleeve A (2) is provided with a large cam A (6), a middle cam A (7) and a small cam A (8), a cam component B (9) of the shaft sleeve B (3) is provided with a large cam B (10), a middle cam B (11) and a small cam B (12), the camshaft mandrel (1) is provided with a positioning hole A (13), a locking spring A (14) is installed in the positioning hole A (13), a locking steel ball A (15) is connected with the locking spring A (14), the inner wall of the shaft sleeve A (2) is provided with a small cam positioning groove A (16) and a middle cam positioning groove A (17), and a large cam positioning groove A (18) is arranged at the joint position of the end face of the shaft sleeve A (2) and the, a positioning hole B (19) is formed in the camshaft mandrel (1), a locking spring B (20) is installed in the positioning hole B (19), a locking steel ball B (21) is connected with the locking spring B (20), a small cam positioning groove B (22) and a middle cam positioning groove B (23) are formed in the inner wall of the shaft sleeve B (3), and a large cam positioning groove B (24) is formed in the joint of the end face of the shaft sleeve B (3) and the inner wall of the shaft sleeve B (3);

the camshaft mandrel (1) is provided with a positioning hole A (13) close to the end part of the left end, a shaft sleeve A (2) is provided with a small cam positioning groove A (16) recessed along the circumference of the inner wall of the shaft sleeve A (2) close to the inner wall of the left end, a middle cam positioning groove A (17) recessed along the circumference of the inner wall of the shaft sleeve A (2) is arranged at the inner wall of the shaft sleeve A (2) between the small cam positioning groove A (16) and the left end of the shaft sleeve A (2), and a large cam positioning groove A (18) of an inclined plane arranged along the circumference of the end surface of the shaft sleeve A (2) is arranged at the joint part of the left end surface of the shaft sleeve A;

the shaft sleeve A (2) comprises a cam component A (5) and an adjusting component A (25), a guide groove A (26) is arranged on the adjusting component A (25), the guide groove A (26) comprises a guide groove A guide surface I (27) in a curved surface shape and a guide groove A guide surface II (35) in a curved surface shape, the shaft sleeve B (3) comprises a cam component B (9) and an adjusting component B (28), a guide groove B (29) is arranged on the adjusting component B (28), and the guide groove B (29) comprises a guide groove B guide surface I (30) in a curved surface shape and a guide groove B guide surface II (36) in a curved surface shape;

the adjusting assembly A (25) of the shaft sleeve A (2) is arranged to be of a semicircular structure along the radial direction of the camshaft mandrel (1), the adjusting assembly A (25) comprises an adjusting assembly A end face I and an adjusting assembly A end face II, and a guide face I (27) of the guide groove A and a guide face II (35) of the guide groove A are respectively arranged to be of a structure capable of extending from the position of the adjusting assembly A end face I to the position of the adjusting assembly A end face II;

the adjusting assembly B (28) of the shaft sleeve B (3) is arranged to be of a semicircular structure along the radial direction of the camshaft mandrel (1), the adjusting assembly B (28) comprises an adjusting assembly B end surface I and an adjusting assembly B end surface II, and a guide surface I (30) of a guide groove B and a guide surface II (36) of the guide groove B are respectively arranged to be of a structure capable of extending from the position of the adjusting assembly B end surface I to the position of the adjusting assembly B end surface II;

the outer surface of the camshaft mandrel (1) is close to the left end position and is provided with a mandrel tooth part A (31) which is axially arranged along the camshaft mandrel (1), the inner wall of the shaft sleeve A (2) is provided with a shaft sleeve A tooth part (32) which is axially arranged along the inner wall of the shaft sleeve A (2), the outer surface of the camshaft mandrel (1) is close to the right end position and is provided with a mandrel tooth part B (33) which is axially arranged along the camshaft mandrel (1), the inner wall of the shaft sleeve B (3) is provided with a shaft sleeve B tooth part (34) which is axially arranged along the inner wall of the shaft sleeve B (3), when the shaft sleeve A (2) and the shaft sleeve B (3) are respectively sleeved on, the shaft sleeve A (2) is sleeved and meshed with a mandrel tooth part A (31) on the camshaft mandrel (1) through a shaft sleeve A tooth part (32), and the shaft sleeve B (3) is sleeved and meshed with a mandrel tooth part B (33) on the camshaft mandrel (1) through a shaft sleeve B tooth part (34).

2. The VVL camshaft locking structure for an internal combustion engine according to claim 1, wherein: camshaft dabber (1) be close to right-hand member end position and set up locating hole B (19), axle sleeve B (3) are close to right-hand member inner wall position and set up along axle sleeve B (3) inner wall a week recessed little cam constant head tank B (22), axle sleeve B (3) inner wall position between little cam constant head tank B (22) and axle sleeve B (3) right-hand member sets up along axle sleeve B (3) inner wall a week recessed well cam constant head tank B (23), axle sleeve B (3) right-hand member terminal surface and axle sleeve B (3) inner wall joint position set up along axle sleeve B (3) terminal surface a week inclined plane arranged big cam constant head tank B (24).

3. The VVL camshaft locking structure for an internal combustion engine according to claim 1 or 2, characterized in that: the electromagnetic valve of the VVL camshaft locking structure for the internal combustion engine is connected with a control component capable of controlling the telescopic switching of each valve core of the electromagnetic valve, when the electromagnetic valve drives the shaft sleeve A (2) to be switched to a small cam state, the locking steel ball A (15) is set to be in a structure capable of being clamped in the small cam positioning groove A (16), when the electromagnetic valve drives the shaft sleeve A (2) to be switched to a middle cam state, the locking steel ball A (15) is set to be in a structure capable of being clamped in the middle cam positioning groove A (17), and when the electromagnetic valve drives the shaft sleeve A (2) to be switched to a large cam state, the locking steel ball A (15) is set to be in a structure capable of being clamped at.

4. The VVL camshaft locking structure for an internal combustion engine according to claim 1 or 2, characterized in that: the electromagnetic valve of the VVL camshaft locking structure for the internal combustion engine is connected with a control component capable of controlling the telescopic switching of each valve core of the electromagnetic valve, when the electromagnetic valve drives the shaft sleeve B (3) to be switched to a small cam state, the locking steel ball B (21) is set to be in a structure capable of being clamped in the small cam positioning groove B (22), when the electromagnetic valve drives the shaft sleeve B (3) to be switched to a middle cam state, the locking steel ball B (21) is set to be in a structure capable of being clamped in the middle cam positioning groove B (23), and when the electromagnetic valve drives the shaft sleeve B (3) to be switched to a large cam state, the locking steel ball B (21) is set to be in a structure capable of being clamped on.

5. The VVL camshaft locking structure for an internal combustion engine according to claim 1 or 2, characterized in that: the positioning holes A (13) are arranged in a plurality of positions along the camshaft mandrel (1) close to the left end in a circle at intervals, each locking steel ball A (15) is arranged to protrude out of one positioning hole A (13), and the center line of each positioning hole A (13) is perpendicular to the center line of the camshaft mandrel (1); the positioning holes B (19) are arranged along the camshaft mandrel (1) close to the right end in a plurality of intervals along the circumference of the camshaft mandrel (1), each locking steel ball B (21) is arranged to protrude out of one positioning hole B (19), and the center line of each positioning hole B (19) is perpendicular to the center line of the camshaft mandrel (1).