CN212202157U - Mechanical tappet structure, valve mechanism and engine - Google Patents
Mechanical tappet structure, valve mechanism and engine Download PDFInfo
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- CN212202157U CN212202157U CN202020381523.6U CN202020381523U CN212202157U CN 212202157 U CN212202157 U CN 212202157U CN 202020381523 U CN202020381523 U CN 202020381523U CN 212202157 U CN212202157 U CN 212202157U
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Abstract
The utility model relates to an engine field discloses a mechanical type tappet structure, valve train and engine. The mechanical tappet structure is used for eliminating the valve clearance of a valve actuating mechanism and comprises a tappet body, the upper end of the tappet body is provided with a containing groove, a cushion block is arranged in the containing groove, and an elastic part is arranged between the bottom of the containing groove and the cushion block; a maximum clearance value L between the cushion block and the groove bottom of the accommodating groove1Not less than the valve clearance value of the valve train, and the maximum allowable deformation amount of the elastic piece is not less than the maximum clearance value L1(ii) a The deformation force of the elastic part which is elastically deformed is smaller than the deformation force of the valve spring of the valve mechanism which is elastically deformed. The utility model provides a mechanical type tappet structure can reduce the wearing and tearing of valve and rocking arm, reduces the valve seating force, eliminates valve clearance to simple structure, the cost is lower.
Description
Technical Field
The utility model relates to the technical field of engines, especially, relate to a mechanical type tappet structure, valve actuating mechanism and engine.
Background
The valve clearance refers to that when an engine works, a valve expands due to temperature rise, and if the valve and a transmission part of the valve are gapless or too small in clearance in a cold state, the valve and the transmission part of the valve are heated and expanded in a hot state to cause the valve to be closed untight to cause air leakage, so that faults such as power reduction and the like are caused. In order to eliminate the phenomenon, when the engine is assembled in a cold state, a certain clearance is reserved between the valve and a transmission mechanism thereof so as to compensate the expansion amount of the valve and the transmission member thereof after being heated.
The tappet is a follower of the cam and its function is to transmit the motion of the cam to the push rod or the valve, while also bearing the lateral force exerted by the cam and transmitting it to the body or to the head.
Traditional mechanical tappet structure does not possess the function of eliminating valve clearance, because the wearing and tearing of each spare part of valve train can cause the grow of valve clearance, and this can reduce the life of valve and rocking arm, the noise increase simultaneously. The hydraulic tappet needs to be provided with a special oil way and hydraulic parts, so that the structure is complex and the cost is high.
The technical scheme that the existing mechanical tappet structure is disclosed in the patent ZL201610673598.X is that an elastic device is generally added above a push rod, valve clearance is eliminated through the elastic device, the elastic device needs to redesign a push rod ball head, and parts of the elastic device are small in size, large in quantity, high in precision requirement and high in processing cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a mechanical type tappet structure can reduce the wearing and tearing of valve and rocking arm, reduces valve seating force, eliminates valve clearance to simple structure, the cost is lower.
Another object of the present invention is to provide a valve train, which utilizes the above-mentioned mechanical tappet structure to eliminate valve lash.
Another object of the present invention is to provide an engine, including the above-mentioned valve actuating mechanism, valve clearance is eliminated to this valve actuating mechanism, can improve the power of engine, and can improve the work efficiency of engine, reduces the energy consumption.
To achieve the purpose, the utility model adopts the following technical proposal:
there is provided a mechanical tappet structure for eliminating a valve lash of a valve train, the mechanical tappet structure including:
the device comprises a tappet body, wherein the upper end of the tappet body is provided with a containing groove, a cushion block is arranged in the containing groove, and an elastic part is arranged between the bottom of the containing groove and the cushion block;
a maximum clearance value L between the cushion block and the groove bottom of the accommodating groove1Not less than the valve clearance value of the valve train, and the maximum allowable deformation amount of the elastic piece is not less than the maximum clearance value L1；
The deformation force of the elastic part which is elastically deformed is smaller than the deformation force of the valve spring of the valve mechanism which is elastically deformed.
Preferably, a protrusion is arranged at the center of the bottom of the accommodating groove, one end of the elastic piece is clamped in the protrusion, and the other end of the elastic piece abuts against the cushion block.
Preferably, the mechanical tappet structure further comprises a stopper disposed above the cushion block and connected to the tappet body, and the stopper is used for limiting an upper limit position of the cushion block moving in the vertical direction.
Preferably, the holding tank is circular groove, be provided with the jump ring groove on the inside wall of holding tank, the stop part is the jump ring, the jump ring card is located in the jump ring groove.
Preferably, the elastic member is a disc spring.
Preferably, the mechanical tappet structure further comprises a guide member, a guide hole is formed in the tappet body in the vertical direction, one end of the guide member is fixed to the engine body of the engine, and the other end of the guide member extends into the guide hole.
Preferably, the lower end of the tappet body is provided with a U-shaped groove penetrating through the tappet body;
the mechanical tappet structure further comprises:
the roller shaft is positioned in the U-shaped groove, and two ends of the roller shaft are arranged on the tappet body;
the roller is rotatably arranged on the roller shaft, the roller is in contact with a cam of the valve actuating mechanism, and the cam is positioned below the roller.
Preferably, the maximum clearance value L1Is in the range of 0.2mm to 1 mm.
Preferably, a first lubricating oil channel is arranged on the elastic part, a second lubricating oil channel communicated with the first lubricating oil channel is arranged on the cushion block, and a third lubricating oil channel communicated with the second lubricating oil channel is arranged on the tappet body.
The utility model discloses in still provide a valve timing mechanism, include mechanical type tappet structure.
The utility model discloses in provide an engine again, include the valve train.
The utility model has the advantages that: the utility model provides an among the mechanical type tappet structure, be provided with the elastic component between the tank bottom of the holding tank of tappet body and the cushion, the elastic component takes place elastic deformation's deformation force and is less than the valve spring of valve actuating mechanism and takes place elastic deformation's deformation force to guarantee that mechanical type tappet structure is at the upward movement initial stage, the lift stage of cam, the elastic component is prior to valve spring and is out of shape.
Meanwhile, the maximum clearance value L between the cushion block and the groove bottom of the accommodating groove is not smaller than the valve clearance value of the valve mechanism, and the maximum allowable deformation of the elastic piece is not smaller than the maximum clearance value L. The reason for the arrangement is that on one hand, after the valve mechanism is assembled, the valve clearance is compensated through the clearance reserved between the tappet body and the cushion block, and the arrangement can completely compensate the valve clearance; on the other hand, in the initial stage of upward movement, the mechanical tappet structure is provided with the elastic piece to ensure that the cushion block and the tappet body, the cushion block and the tappet of the valve mechanism and the rocker arm of the valve mechanism and the valve bridge (or the valve) of the valve mechanism are gradually contacted to play a role of buffering, so that the abrasion of the rocker arm and the valve is reduced, the seating force impact of the valve is reduced, the service life of the valve is prolonged, the opening duration of the valve is prolonged, the mechanical noise and vibration generated by the valve clearance are reduced, and the whole valve mechanism works more stably.
In addition, the structure is improved on the basis of the original mechanical tappet structure, and has the advantages of simple improvement, less structural change and low cost.
Drawings
Fig. 1 is a schematic view of the overall structure of the valve train of the present invention;
fig. 2 is a schematic structural view of the mechanical tappet structure shown in fig. 1;
fig. 3 is a schematic view of the structure from a-a in fig. 2 according to the present invention;
fig. 4 is a schematic structural view of the elastic member of the present invention;
FIG. 5 is a schematic structural diagram of the cushion block of the present invention;
fig. 6 is a schematic structural view of the stopper of the present invention.
In the figure:
1. a tappet body; 10. accommodating grooves; 20. a U-shaped groove; 11. a protrusion; 12. a clamp spring groove; 13. a guide hole; 2. cushion blocks; 21. a second lubricating oil passage; 3. a push rod; 4. an elastic member; 41. a first lubricating oil passage; 5. a stopper; 6. a roller shaft; 7. a roller; 8. a cam; 9. a guide member;
22. a rocker arm assembly; 23. a valve assembly; 231. a valve bridge; 232. a valve spring; 233. and (4) air valves.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. 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.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Fig. 1 is a schematic diagram of the overall configuration of a valve train, and the valve train of an engine will be described below with reference to fig. 1. The utility model discloses in provide a valve actuating mechanism, including mechanical type tappet structure. The valve train adopts a mechanical tappet structure to eliminate the valve clearance of the valve train.
In fig. 1, the valve train further includes a cam 8, a pushrod 3, a rocker arm assembly 22, and a valve assembly 23. The rocker arm assembly 22 is of a conventional structure, and the rocker arm assembly 22 includes a rocker arm shaft and a rocker arm, and the rocker arm reciprocates using the rocker arm shaft as a rotation shaft. Valve assembly 23 includes valve bridge 231, valve spring 232 and valve 233, and valve bridge 231 drives valve 233 and moves, and valve spring 232 makes valve 233 reset, and valve assembly 23 is current structure, the utility model provides a technical improvement point is not at rocker arm assembly 22 and valve assembly 23, therefore no longer explains.
The working process of the valve actuating mechanism is as follows: when the cam 8 rotates to a lift section, the mechanical tappet structure is pushed upwards, the push rod 3 above the mechanical tappet structure is pushed to move upwards, the push rod 3 acts on one end of the rocker arm, the rocker arm rotates to enable the other end of the rocker arm to be pressed downwards, and the valve bridge 231 presses the valve 233 downwards under the action of the rocker arm to complete one-time air intake or exhaust. The cam 8 continues to rotate, when the cam rotates to the return segment, the valve spring returns to push the valve bridge upwards, the rocker arm is driven to rotate, and the rocker arm pushes the push rod 3 and the mechanical tappet structure to move downwards.
Specifically, as shown in fig. 2 to 3, the mechanical tappet structure includes a tappet body 1, an accommodating groove 10 is formed at an upper end of the tappet body 1, a cushion block 2 is disposed in the accommodating groove 10, and an elastic member 4 is disposed between a groove bottom of the accommodating groove 10 and the cushion block 2. The deformation force of the elastic part 4 which is elastically deformed is smaller than the deformation force of the valve spring of the valve mechanism which is elastically deformed, so that the elastic part 4 is deformed before the valve spring in the initial upward movement stage and the lift stage of the cam 8 of the mechanical tappet structure.
Meanwhile, the maximum clearance value L between the cushion block 2 and the bottom of the accommodating groove 101Not less than the valve clearance value of the valve train, and the maximum allowable deformation amount of the elastic member 4 is not less than the maximum clearance value L1. The reason for the arrangement is that on one hand, after the valve mechanism is assembled, the valve clearance is compensated through the clearance reserved between the tappet body 1 and the cushion block 2, and the arrangement can completely compensate the valve clearance; on the other hand, in the initial stage of upward movement, the mechanical tappet structure is provided with the elastic part 4, so that the contact between the cushion block 2 and the tappet body 1, the contact between the cushion block 2 and the tappet body 3 and the contact between the rocker arm and the valve bridge (or the valve) are gradually realized, a buffering effect is realized, the abrasion of the rocker arm and the valve 233 is reduced, the seating force impact of the valve 233 is reduced, the service life of the valve 233 is prolonged, the opening duration of the valve 233 is prolonged, the mechanical noise and vibration generated by the valve clearance are reduced, and the whole valve actuating mechanism works more stably. In addition, the structure is improved on the basis of the original mechanical tappet structure, and has the advantages of simple improvement, less structural change and low cost.
In addition, when the push rod 3 and the cushion block 2 are worn, a certain gap is formed between the push rod and the cushion block, but the gap is small. In the above technical solution, the maximum clearance value L between the spacer 2 and the bottom of the accommodating groove 101Can be used forThe maximum allowable deformation amount of the elastic piece 4 can be larger than the maximum clearance value L when the maximum allowable deformation amount is larger than the valve clearance value of the valve mechanism1. The amount of deformation of the elastic member 4 also makes it possible to compensate for a certain amount of play caused by wear.
Preferably, in order to keep the position of the elastic element 4 stable in the receiving groove 10, a protrusion 11 is disposed at a central position of the bottom of the receiving groove 10, one end of the elastic element 4 is clamped in the protrusion 11, and the other end abuts against the cushion block 2.
The protrusion 11 in this embodiment is a cylinder, a central circular hole is disposed on the elastic member 4, and the circular protrusion 11 is sleeved with the central circular hole of the elastic member 4, so as to ensure that the position of the elastic member 4 does not change. Preferably, the elastic member 4 is a cylindrical spring, a conical spring or a disc spring. In a more specific embodiment, the maximum clearance L between the pad 2 and the bottom of the receiving groove 10 is set to be greater than the maximum clearance L1Is 0.2mm to 1mm, i.e., the maximum distance L between the bottom of the spacer 2 and the upper surface of the protrusion 11 in FIG. 21Here, the maximum distance L between the bottom of the spacer 2 and the upper surface of the protrusion 11 is reached1Is the distance between the two when the head block 2 moves to the upper limit position. Due to the maximum clearance value L1The value is small, the elastic piece 4 is preferably a disc spring, the axial size of the disc spring is small, and the maximum allowable deformation amount of the disc spring can meet the use requirement. The maximum gap value L in this embodiment1Is 0.5 mm.
The mechanical tappet structure further comprises a stop part 5, the stop part 5 is arranged above the cushion block 2 and connected to the tappet body 1, and the stop part 5 is used for limiting the upper limit position of the cushion block 2 along the axial movement.
Preferably, the accommodating groove 10 is a circular groove in the present embodiment, and a clamp spring groove 12 is disposed on an inner side wall of the accommodating groove 10, and the clamp spring groove 12 is located above the cushion block 2. As shown in fig. 6, the stop member 5 is a snap spring, and the snap spring is clamped in the snap spring groove 12.
The lower end of the tappet body 1 is provided with a U-shaped groove 20 penetrating through the tappet body 1, the mechanical tappet structure further comprises a roller shaft 6 and a roller 7, wherein the roller shaft 6 is positioned in the U-shaped groove 20, and two ends of the roller shaft 6 are installed on the tappet body 1. The roller 7 is rotatably arranged on the roller shaft 6, the roller 7 is contacted with a cam 8 of the valve actuating mechanism, and the cam 8 is positioned below the roller 7.
In the initial stage of upward movement of the mechanical tappet structure in this embodiment, the cam 8 moves to the lift section, the roller 7 rotates in contact with the cam 8, and simultaneously pushes the roller shaft 6, the roller 7 and the tappet body 1 upward to move synchronously, and at this time, the maximum gap value L between the cushion block 2 and the tappet body 1 in the vertical direction is1And when in work, because the elastic deformation force of the disc spring is lower than the elastic deformation force of the valve spring 232, the disc spring generates elastic deformation firstly, so the maximum clearance value L is generated along with the rotation of the cam 8 in the lift section1Will disappear slowly, when the upper part of the tappet body 1 contacts the bottom of the cushion block 2, the elastic contact of the tappet body and the cushion block is changed into rigid contact. In this process, it is achieved that the elephant foot of the rocker arm is always pressed against the valve bridge 231.
Fig. 4 shows a first lubricating oil passage 41 provided in the disc spring, and fig. 5 shows a second lubricating oil passage 21 provided in the spacer 2 and communicating with the first lubricating oil passage 41. Meanwhile, the tappet body 1 is provided with a third lubricating oil passage (the third lubricating oil passage is not shown in the drawing) communicating with the second lubricating oil passage 21.
After flowing down to the mechanical tappet structure along the outer wall of the push rod 3 in fig. 1, the lubricating oil flows to the roller 7 through the first lubricating oil channel 41 on the butterfly spring, the second lubricating oil channel 21 on the cushion block 2 and the third lubricating oil channel on the tappet body 1 in sequence, so as to lubricate the roller shaft 6 and the cam 8.
As shown in fig. 1, the mechanical tappet structure further includes a guide member 9, a guide hole 13 is formed in the tappet body 1 in the vertical direction, one end of the guide member 9 is fixed to the engine body of the engine, and the other end of the guide member 9 extends into the guide hole 13 to prevent the tappet body 1 from rotating in the axial direction of the tappet body 1. Preferably, the guide 9 is a screw.
In addition, in other embodiments, the roller 7 and roller shaft 6 structure in the mechanical tappet structure is replaced by a flat bottom piece.
The embodiment also provides an engine which comprises the valve actuating mechanism, the valve actuating mechanism eliminates valve clearances, the power of the engine can be improved, the working efficiency of the engine can be improved, and the energy consumption is reduced.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A mechanical tappet structure, for eliminating a valve lash of a valve train, the mechanical tappet structure comprising:
the device comprises a tappet body (1), wherein an accommodating groove (10) is formed in the upper end of the tappet body (1), a cushion block (2) is arranged in the accommodating groove (10), and an elastic part (4) is arranged between the bottom of the accommodating groove (10) and the cushion block (2);
the maximum clearance value L between the cushion block (2) and the groove bottom of the accommodating groove (10)1Not less than the valve clearance value of the valve train, and the maximum allowable deformation amount of the elastic member (4) is not less than the maximum clearance value L1；
The deformation force of the elastic piece (4) which is elastically deformed is smaller than the deformation force of the valve spring of the valve mechanism which is elastically deformed.
2. The mechanical tappet structure of claim 1, wherein a protrusion (11) is disposed at a central position of the bottom of the accommodating groove (10), one end of the elastic member (4) is clamped in the protrusion (11), and the other end of the elastic member abuts against the cushion block (2).
3. Mechanical tappet structure according to claim 1 or 2, characterised in that it further comprises a stop (5) arranged above the pad (2) and connected to the tappet body (1), said stop (5) being intended to limit the upper limit position of the movement of the pad (2) in the vertical direction.
4. The mechanical tappet structure of claim 3, wherein the accommodating groove (10) is a circular groove, a clamp spring groove (12) is formed in the inner side wall of the accommodating groove (10), and the stop member (5) is a clamp spring clamped in the clamp spring groove (12).
5. Mechanical tappet structure according to claim 1 or 2, characterised in that the elastic member (4) is a disc spring.
6. The mechanical tappet structure of claim 1 or 2, further comprising a guide member (9), wherein the tappet body (1) is provided with a guide hole (13) along a vertical direction, one end of the guide member (9) is fixed on a body of an engine, and the other end of the guide member (9) extends into the guide hole (13).
7. Mechanical tappet structure according to claim 1 or 2, characterised in that the lower end of the tappet body (1) is provided with a U-shaped groove (20) through the tappet body (1);
the mechanical tappet structure further comprises:
the roller shaft (6) is positioned in the U-shaped groove (20), and two ends of the roller shaft (6) are installed on the tappet body (1);
the roller (7) is rotatably arranged on the roller shaft (6), the roller (7) is in contact with a cam (8) of the valve train, and the cam (8) is positioned below the roller (7).
8. Mechanical tappet structure according to claim 1 or 2, characterised in that said maximum clearance value L1Is in the range of 0.2mm to 1 mm.
9. The mechanical tappet structure of claim 1 or 2, wherein the resilient member (4) is provided with a first oil passage (41), the pad block (2) is provided with a second oil passage (21) communicating with the first oil passage (41), and the tappet body (1) is provided with a third oil passage communicating with the second oil passage (21).
10. A valve train comprising the mechanical lifter structure of any of claims 1-9.
11. An engine comprising the valve train of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020381523.6U CN212202157U (en) | 2020-03-23 | 2020-03-23 | Mechanical tappet structure, valve mechanism and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020381523.6U CN212202157U (en) | 2020-03-23 | 2020-03-23 | Mechanical tappet structure, valve mechanism and engine |
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| Publication Number | Publication Date |
|---|---|
| CN212202157U true CN212202157U (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020381523.6U Active CN212202157U (en) | 2020-03-23 | 2020-03-23 | Mechanical tappet structure, valve mechanism and engine |
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| Country | Link |
|---|---|
| CN (1) | CN212202157U (en) |
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- 2020-03-23 CN CN202020381523.6U patent/CN212202157U/en active Active
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