CN211500740U

CN211500740U - Engine valve mechanism and engine

Info

Publication number: CN211500740U
Application number: CN201922345697.7U
Authority: CN
Inventors: 常兴宇; 李军; 史鹏礼; 郭学敏
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-09-15
Anticipated expiration: 2029-12-24

Abstract

The utility model discloses an engine valve actuating mechanism and engine belongs to engine technical field, include: the first hole and the second hole are communicated and arranged on a cylinder cover of the engine, and the second hole is positioned between the first hole and an air port on the cylinder cover; the tappet is arranged in the first hole and is of a tubular structure with one open end, an arc-shaped bulge is arranged on the outer side of the closed end of the tubular structure, and the arc-shaped bulge is provided with an arc-shaped surface matched with the cam; the valve rod penetrates through the first hole and the second hole, one end of the valve rod is connected to the tappet, the other end of the valve rod is connected to the valve, and the valve is used for closing or opening the air port; the elastic structure is arranged in the first hole and configured to enable the arc-shaped surface to be always abutted against the cam; and the guide structure is arranged between the tappet and the first hole, and the guide structure is configured to limit the tappet to move only along the axial direction of the first hole. The friction and abrasion of the tappet can be reduced, and the tappet is prevented from rotating.

Description

Engine valve mechanism and engine

Technical Field

The utility model relates to an engine technical field especially relates to an engine valve actuating mechanism and engine.

Background

The tappet is an important component in an automobile engine air distribution system, transmits the thrust of a cam to a valve and bears the lateral force applied when the cam rotates. The tappet in the existing engine product is directly contacted with the cam, the surface of the tappet, which is abutted against the cam, is generally a plane, and the contact stress is large, so that the surface of the tappet is easy to wear, and the service life is shortened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an engine gas distribution structure to reduce the contact stress of tappet and cam, reduce the wearing and tearing on tappet surface, prolong the life of tappet.

As the conception, the utility model adopts the technical proposal that:

an engine valve train comprising:

the first hole and the second hole which are communicated are arranged on a cylinder cover of the engine, and the second hole is arranged between the first hole and an air port on the cylinder cover;

the tappet is of a cylindrical structure with one open end, an arc-shaped bulge is arranged on the outer side of the closed end of the cylindrical structure, and the arc-shaped bulge is provided with an arc-shaped surface matched with the cam;

the valve rod penetrates through the first hole and the second hole, one end of the valve rod is connected to the tappet, the other end of the valve rod is connected to the valve, and the valve is used for closing or opening the air port;

an elastic structure arranged in the first hole, wherein the elastic structure is configured to enable the arc-shaped surface to be always abutted against the cam;

a guide structure disposed between the tappet and the first hole, the guide structure being configured to be able to restrict movement of the tappet only in an axial direction of the first hole.

Further, the guide structure comprises a sliding groove extending along the axial direction of the first hole and a sliding block capable of sliding along the sliding groove, one of the sliding groove and the sliding block is arranged on the inner wall of the first hole, and the other one of the sliding groove and the sliding block is arranged on the outer peripheral surface of the tappet.

Furthermore, an annular groove is formed in the outer peripheral face of the cam along the circumferential direction of the cam, the arc-shaped protrusion is located in the annular groove, and the arc-shaped face of the arc-shaped protrusion abuts against the bottom face of the annular groove.

Further, the arc-shaped protrusion extends along the radial direction of the tubular structure, at least one side of the two sides of the width direction of the arc-shaped protrusion is provided with a limiting plate, and the limiting plate abuts against the corresponding axial side face of the cam.

Furthermore, the closed end is provided with an installation column protruding inwards the cylindrical structure, the installation column is provided with an installation hole for inserting the valve rod, the installation column is provided with a plurality of insertion holes communicated with the installation hole along the circumferential direction of the installation column, and the positions of the valve rod corresponding to the insertion holes are provided with insertion grooves;

the engine valve mechanism further comprises an elastic clamping structure, and the elastic clamping structure can penetrate through the insertion hole and extend into the insertion groove to realize connection of the valve rod and the mounting column.

Further, the diameter in first hole is greater than the diameter in second hole, first hole with form the ladder face between the second hole, elastic construction is located including the cover spring on the valve stem, spring one end butt in the ladder face, the other end is located in the tubular structure.

Further, an annular structure communicated with the second hole is arranged on the step surface, and the annular structure is sleeved with the spring.

Further, engine valve actuating mechanism still includes the spring holder, the spring housing is located the valve stem, and be located tubular structure's inner chamber, spring one end butt in the ladder face, the other end butt in the spring holder.

Further, the engine valve actuating mechanism further comprises a guide sleeve, the guide sleeve is arranged on the valve rod, one end of the guide sleeve is located in the second hole, and the other end of the guide sleeve is located in the first hole.

In order to achieve the purpose, the application further provides an engine comprising the engine valve mechanism of any one of the above items.

The utility model has the advantages that:

the utility model provides an engine valve actuating mechanism is provided with the arc arch through the blind end outside at tubular structure, and the arc arch has the arcwall face with cam matched with, can reduce the area of contact between cam and the tappet, reduces frictional force to reduce tappet frictional wear, the life of extension tappet, the setting of arcwall face can increase the sliding range of tappet moreover, and then realizes the cam molded lines of the big lift of parcel angle. Through setting up guide structure, can lead to the tappet for the tappet is along the axis direction motion in first hole all the time, avoids the tappet to take place to rotate, guarantees this engine valve actuating mechanism's normal work.

Drawings

Fig. 1 is a schematic structural diagram of an engine valve train provided by the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1.

In the figure:

1. a tappet; 11. an arc-shaped surface; 12. a slider; 13. mounting a column; 2. a cam; 21. an annular groove; 31. a valve stem; 32. an air valve; 4. a spring; 5. a spring seat; 6. a guide sleeve; 7. valve oil seal; 8. an annular structure; 9. an elastic clamping structure;

10. a first hole; 20. a second hole; 100. a cylinder head; 101. a chute.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the present embodiment provides an engine valve timing structure, which includes a first hole 10 and a second hole 20 communicated with each other, a tappet 1, a cam 2, a valve stem 31, a valve 32, an elastic structure, and a guide structure. The first hole 10 and the second hole 20 are both arranged on a cylinder cover 100 of the engine, the second hole 20 is positioned between air ports on the first hole 10 and the cylinder cover 100, an air passage is arranged on the cylinder cover 100, and the air passage can be communicated with a combustion chamber through the air ports. Cam 2 can the pivoted set up on cylinder head 100, and tappet 1 is one end and has open-ended tubular structure, and the blind end outside of tubular structure is provided with the arc arch, and the arc arch has the arcwall face 11 with cam 2 complex. The valve rod 31 is inserted into the first hole 10 and the second hole 20, one end of the valve rod 31 is connected to the tappet 1, and the other end of the valve rod 31 is connected to the valve 32, and the valve 32 is used for closing or opening the valve. The elastic structure is provided in the first hole 10, and the elastic structure is arranged so that the arc surface 11 of the tappet 1 always abuts against the circumferential surface of the cam 2. A guide structure is provided between the tappet 1 and the first hole 10, the guide structure being configured to restrict the movement of the tappet 1 only in the axial direction of the first hole 10.

In this embodiment, a strip-shaped arc protrusion extending along the radial direction of the tubular structure is disposed outside the closed end of the tubular structure, the width of the arc protrusion is smaller than the outer diameter of the tubular structure, and the top surface of the arc protrusion is the arc surface 11. In other embodiments, a rotatable roller having the arc-shaped surface 11 may be provided outside the closed end of the tubular structure, but this may complicate the structure of the lifter 1.

Optionally, an annular groove 21 is provided on the outer circumferential surface of the cam 2 along the circumferential direction thereof, the arc-shaped protrusion is located in the annular groove 21, and the arc-shaped surface 11 of the arc-shaped protrusion abuts against the groove bottom surface of the arc-shaped groove 21. By providing the cam 2 with an annular groove 21, the arc-shaped protrusion is located within the annular groove 21, which can further prevent the tappet 1 from rotating during movement. Certainly, in other embodiments, the limiting plates may be disposed on at least one of two sides of the arc-shaped protrusion in the width direction, the limiting plates abut against the axial side faces of the corresponding cams 2, and the limiting plates limit the tappet 1, so that the rotation of the tappet 1 in the movement process is avoided.

Further, in the present embodiment, the above-described guide structure includes the slide groove 101 extending in the axial direction of the first hole 10 and the slider 12 slidable along the slide groove 101, and one of the slider 12 and the slide groove 101 is provided on the inner wall of the first hole 10 and the other is provided on the outer peripheral surface of the tappet 1. Cooperate through slider 12 and spout 101 and lead to and spacing tappet 1 for tappet 1 moves along the axis direction in first hole 10 all the time under the effect of cam 2 and elastic construction, avoids tappet 1 to take place to rotate. Specifically, in the present embodiment, the sliding groove 101 is provided on the inner wall of the first hole 10, the sliding block 12 is provided on the outer circumferential surface of the tappet 1, and the sliding block 12 and the tappet 1 are integrally formed. Furthermore, optionally, there is a preset clearance between the slider 12 and the bottom surface of the chute 101 in the radial direction of the first hole 10, so as to avoid friction between the slider 12 and the chute 101 from affecting the movement of the tappet 1. In addition, optionally, in order to reduce friction between the slider 12 and the side wall of the sliding chute 101, an arc-shaped protrusion is provided on one side of the slider 12 corresponding to each side wall of the sliding chute 101, so as to reduce a contact area between the slider 12 and the side wall of the sliding chute 101, and reduce friction force.

Certainly in other embodiments, the sliding block 12 may be provided separately from the tappet 1, for example, a mounting groove is provided on the tappet 1, the sliding block 12 may be mounted in the mounting groove, and one end of the sliding block 12 extends into the sliding groove 101, so that the tappet 1 is guided and limited in the moving process of the tappet 1, the tappet 1 moves along the axis direction of the first hole 10, and the rotation of the tappet 1 is avoided.

Furthermore, the closed end is provided with a mounting column 13 protruding inwards the tubular structure, the mounting column 13 is provided with a mounting hole for inserting the valve rod 31, the mounting column 13 is provided with a plurality of insertion holes communicated with the mounting hole along the circumferential direction of the mounting column 13, and the valve rod 31 is provided with a slot corresponding to the insertion holes. The engine valve actuating mechanism further comprises an elastic clamping structure 9, wherein the elastic clamping structure 9 can penetrate through the insertion hole and extend into the insertion slot, and the connection between the valve rod 31 and the mounting column 13 is achieved. In this embodiment, the elastic clamping structure 9 is a C-shaped clamp spring, the inner side surface of the C-shaped clamp spring is convexly provided with protrusions corresponding to the plurality of insertion holes one by one, and the protrusions can penetrate through the corresponding insertion holes and be inserted into the corresponding insertion grooves, so that the valve rod 31 is connected with the mounting post 13.

The diameter of the first hole 10 is larger than that of the second hole 20, so a step surface is formed between the first hole 10 and the second hole 20, the elastic structure comprises a spring 4 sleeved on the valve rod 31, one end of the spring 4 abuts against the step surface, and the other end of the spring is located in the tubular structure. Specifically, in this embodiment, the engine valve train further includes a spring seat 5, the spring seat 5 is sleeved on the valve stem 31 and located in the inner cavity of the tubular structure, and one end of the spring 4 extending into the inner cavity of the tubular structure abuts against the spring seat 5. Of course, in other embodiments, the end of the spring 4 extending into the tubular structure may also directly abut against the closed end of the tubular structure. Through setting up spring holder 5, can be when the equipment, adjust the effort that spring 4 applyed between the arcwall face 11 of tappet 1 and cam 2 global through the position of adjustment spring holder 5, when guaranteeing that the arcwall face 11 of tappet 1 and cam 2 global keeps good contact, reduce frictional force, extension tappet 1's life.

Further, the stepped surface is provided with an annular structure 8 communicated with the second hole 20, and the annular structure 8 is sleeved with the spring 4. It will be appreciated that the end of the spring 4 remote from the spring seat 5 is located in an annular recess 21 formed between the annular formation 8 and the inner wall of the first bore 10, thereby enabling guidance and retention of the spring 4 to avoid deflection of the spring 4 when compressed or extended. Optionally, the engine air distribution structure further comprises an annular gasket, and the annular gasket is detachably arranged in the annular groove 21. After the spring 4 works for a period of time, the elastic coefficient of the spring 4 is reduced, and at the moment, the annular gasket can be placed in the annular groove 21, so that the movement interval of the spring 4 is reduced, the spring 4 can still apply acting force to the tappet 1, and the service life of the spring 4 is prolonged.

Further, the engine valve actuating mechanism further comprises a guide sleeve 6 and a valve oil seal 7, the valve rod 31 is sleeved with the guide sleeve 6, one end of the guide sleeve 6 is located in the first hole 10, and the other end of the guide sleeve 6 is located in the second hole 20. The valve oil seal 7 is sleeved on the valve rod 31 and pressed against one end of the guide sleeve 6 positioned in the first hole 10, and the valve oil seal 7 is used for preventing the valve 32 from bringing a part of engine oil into a combustion chamber when moving linearly.

In summary, the engine valve distribution structure provided in this embodiment includes a first hole 10 and a second hole 20 that are communicated with each other, a tappet 1, a cam 2, a valve 32, an elastic structure, and a guide structure, where the first hole 10 and the second hole 20 are both disposed on a cylinder head 100 of an engine, the second hole 20 is located between the first hole 10 and an air port on the cylinder head 100, the cam 2 can be rotatably disposed on the cylinder head 100, the tappet 1 is disposed in the first hole 10, the tappet is a tubular structure with an opening at one end, an arc-shaped protrusion is disposed on an outer side of a closed end of the tubular structure, and the arc-shaped protrusion has an arc-shaped surface 11 that is matched with the cam 2; the valve rod 31 penetrates through the first hole 10 and the second hole 20, one end of the valve rod 31 is connected to the tappet 1, the other end of the valve rod 31 is connected to the valve 32, and the valve 32 is used for closing or opening the valve; the elastic structure is arranged in the first hole 10, and the elastic structure is configured to enable the arc-shaped surface 11 of the tappet 1 to be always abutted against the peripheral surface of the cam 2; a guide structure is provided between the tappet 1 and the first hole 10, and the guide structure can restrict the movement of the tappet 1 only in the axial direction of the first hole 10.

Be provided with the arc arch through the blind end outside at tubular structure, the arc arch has with cam 2 matched with arcwall face 11, can reduce the area of contact between cam 2 and the tappet 1, reduces frictional force to reduce 1 friction and wear of tappet, prolong the life of tappet 1, the range of sliding of tappet 1 can be increased in the setting of arcwall face 11 moreover, and then the cam molded lines of realization packet angle large lift. Through setting up guide structure, can lead to tappet 1 for tappet 1 moves along the axis direction in first hole 10 all the time, avoids tappet 1 to take place to rotate, guarantees this engine valve actuating mechanism's normal work. In addition, when the circumferential surface of the cam 2 has a curved surface that is concave inward, the tappet 1 can still maintain good contact with the circumferential surface of the cam 2, increasing the stroke of the tappet 1 in the axial direction of the first hole 10.

The embodiment also provides an engine which is provided with the engine valve actuating mechanism.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An engine valve train, comprising:

the cylinder head structure comprises a first hole (10) and a second hole (20) which are communicated, wherein the first hole and the second hole are arranged on a cylinder head (100) of an engine, and the second hole (20) is positioned between a gas port on the first hole (10) and a gas port on the cylinder head (100);

the tappet is characterized by comprising a tappet (1) and a cam (2), wherein the cam (2) is rotatably arranged on the cylinder cover (100), the tappet (1) is arranged in the first hole (10), the tappet (1) is of a cylindrical structure with one open end, an arc-shaped bulge is arranged on the outer side of the closed end of the cylindrical structure, and the arc-shaped bulge is provided with an arc-shaped surface (11) matched with the cam (2);

the valve rod (31) penetrates through the first hole (10) and the second hole (20), one end of the valve rod (31) is connected to the tappet (1), the other end of the valve rod is connected to the valve (32), and the valve (32) is used for closing or opening the valve;

an elastic structure arranged in the first hole (10), the elastic structure being configured to keep the arc-shaped face (11) in abutment against the cam (2) at all times;

a guide structure disposed between the tappet (1) and the first hole (10), the guide structure being configured to be able to restrict movement of the tappet (1) only in an axial direction of the first hole (10).

2. An engine valve gear according to claim 1, wherein the guide structure includes a slide groove (101) extending in the axial direction of the first hole (10) and a slider (12) slidable along the slide groove (101), one of the slide groove (101) and the slider (12) being provided on the inner wall of the first hole (10) and the other being provided on the outer peripheral surface of the tappet (1).

3. An engine valve gear according to claim 1, characterized in that the outer peripheral surface of the cam (2) is provided with an annular groove (21) along the circumferential direction thereof, the arc-shaped protrusion is positioned in the annular groove (21), and the arc-shaped surface (11) of the arc-shaped protrusion abuts against the groove bottom surface of the annular groove (21).

4. The engine valve gear according to claim 1, wherein the arc-shaped protrusion extends in the radial direction of the cylindrical structure, and the arc-shaped protrusion is provided with a limiting plate at least at one of two sides in the width direction, and the limiting plate abuts against the corresponding side surface in the axial direction of the cam (2).

5. The engine valve actuating mechanism according to claim 1, wherein the closed end is provided with a mounting column (13) protruding inwards the cylindrical structure, the mounting column (13) is provided with a mounting hole for inserting the valve rod (31), the mounting column (13) is provided with a plurality of insertion holes communicated with the mounting hole along the circumferential direction, and the valve rod (31) is provided with a slot at a position corresponding to the insertion holes;

the engine valve mechanism further comprises an elastic clamping structure (9), wherein the elastic clamping structure (9) can penetrate through the insertion hole and extend into the insertion groove, and the connection between the valve rod (31) and the mounting column (13) is achieved.

6. The engine valve gear according to claim 1, characterized in that the diameter of the first hole (10) is larger than that of the second hole (20), a step surface is formed between the first hole (10) and the second hole (20), the elastic structure comprises a spring (4) sleeved on the valve stem (31), one end of the spring (4) abuts against the step surface, and the other end of the spring is located in the cylindrical structure.

7. An engine valve gear according to claim 6, characterized in that the stepped surface is provided with an annular structure (8) communicated with the second hole (20), and the spring (4) is sleeved on the annular structure (8).

8. The engine valve gear according to claim 6, characterized in that the engine valve gear further comprises a spring seat (5), the spring seat (5) is sleeved on the valve rod (31) and located in the inner cavity of the tubular structure, one end of the spring (4) abuts against the step surface, and the other end of the spring (4) abuts against the spring seat (5).

9. An engine valve gear according to claim 1, characterized in that the engine valve gear further comprises a guide sleeve (6), the guide sleeve (6) being arranged at the valve stem (31), one end of the guide sleeve (6) being located in the second bore (20) and the other end being located in the first bore (10).

10. An engine comprising an engine valve train according to any one of claims 1 to 9.