Tappet and engine air distribution structure

Abstract

The utility model relates to the technical field of engines, in particular to a tappet and an engine air distribution structure. The tappet comprises a tappet body and a chassis, one end of the column body is fixedly connected with the base plate, the other end of the column body is provided with a containing cavity, the containing cavity is used for containing a push rod, the column body is further provided with a chipping channel, an inlet of the chipping channel is communicated with the containing cavity, an outlet of the chipping channel is located in the side face of the column body, and the chipping channel is communicated with the containing cavity. An outlet of the chipping channel is located between an inlet of the chipping channel and the base plate, and the chipping channel is used for discharging impurities in the containing cavity. The impurities in the accommodating cavity of the tappet can be discharged in time, so that the abrasive wear of the impurities to the tappet and the tappet body is reduced, the abnormal conditions of the engine gas distribution structure are reduced, and the working stability of the engine gas distribution structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, especially a tappet and engine valve train structure. BACKGROUND

[0002] The tappet is a key part in the engine valve train structure, and the function and working principle of the tappet are as follows: the tappet is installed in the tappet hole in the engine body, and the tappet is in contact with the camshaft below, the profile contour of the cam is converted into the up-down reciprocating motion of the tappet through the rotation of the camshaft, the up-down reciprocating motion is transmitted to the rocker arm through the push rod inserted in the tappet accommodating cavity, and finally the opening and closing actions of the intake and exhaust valves are realized through the rocker arm.

[0003] However, after the tappet works for a long time, the debris generated by friction is easily accumulated in the accommodating cavity of the tappet, which causes abrasive wear between the accommodating cavity of the tappet and the push rod, and the abrasive wear between the tappet and the push rod is serious, which leads to abnormal increase of the valve clearance, shedding of the valve bridge, and major faults such as piston valve collision of the engine.

[0004] Therefore, how to discharge the debris in the accommodating cavity of the tappet becomes a problem to be solved. SUMMARY

[0005] Therefore, the utility model embodiment provides a tappet and engine valve train structure, and the impurities in the accommodating cavity of the tappet can be discharged in time through the debris passage, so that the above technical problems are solved.

[0006] In a first aspect, the utility model embodiment provides a tappet, which comprises: a column body and a base plate; one end of the column body is fixedly connected with the base plate, the other end of the column body has an accommodating cavity, and the accommodating cavity is used for accommodating a push rod; the column body further has a debris passage, the inlet of the debris passage is communicated with the accommodating cavity, the outlet of the debris passage is located on the side surface of the column body, and the outlet of the debris passage is located between the inlet of the debris passage and the base plate; and the debris passage is used for discharging the impurities in the accommodating cavity.

[0007] The tappet in the application comprises a column body and a base plate, one end of the column body has an accommodating cavity for accommodating a push rod, and the column body further has a debris passage, one end of the debris passage is communicated with the accommodating cavity, and the other end of the debris passage is located on the side surface of the column body. When the debris generated by friction between the push rod and the inner wall of the accommodating cavity is accumulated in the accommodating cavity, the debris in the accommodating cavity can be discharged to the side surface of the column body through the debris passage, so that abrasive wear is reduced between the inner wall of the accommodating cavity and the push rod, that is, abrasive wear is reduced between the column body and the push rod, the stability of the work of the column body and the push rod is improved, and the service life of the column body and the push rod is improved. Therefore, the abnormal situation of the engine valve train structure is reduced, and the stability of the work of the engine valve train structure is improved.

[0008] In one embodiment, the inner diameter of the debris passage is 0.01-0.1 times the diameter of the column.

[0009] In one embodiment, the distance between the debris passage and the base plate gradually decreases along the path from the inlet of the debris passage to the outlet of the debris passage.

[0010] In one embodiment, the inlet of the debris passage is arranged at the bottom of the accommodating cavity.

[0011] In one embodiment, there are two debris passages, and the two debris passages are symmetrically arranged.

[0012] In one embodiment, the debris passage is linear.

[0013] In one embodiment, the debris passage is spiral.

[0014] In one embodiment, the debris passage is arc-shaped.

[0015] In one embodiment, the column and the base plate are integrally formed.

[0016] In a second aspect, the application provides an engine valve structure, comprising the tappet according to any of the technical solutions in the first aspect. Since the tappet has the debris passage, the debris passage can discharge the debris generated between the tappet and the push rod, which can reduce the abrasive wear between the column and the push rod, reduce the probability of abnormal conditions of the engine valve structure, and improve the stability of the engine valve structure. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a tappet according to an embodiment of the application;

[0018] Figure 2 FIG. 2 is another structural schematic diagram of a tappet according to an embodiment of the application;

[0019] Figure 3 FIG. 3 is another structural schematic diagram of a tappet according to an embodiment of the application;

[0020] Figure 4 FIG. 4 is another structural schematic diagram of a tappet according to an embodiment of the application.

[0021] FIG. 5 is a structural schematic diagram of an engine valve structure according to an embodiment of the application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of protection of the present utility model.

[0023] The tappet and the engine valve train structure provided by the embodiments of the present utility model will be specifically described below with reference to the drawings.

[0024] Figure 1 Fig. 1 is a structural schematic view of a tappet provided by the embodiments of the present utility model, Figure 2 Fig. 2 is another structural schematic view of a tappet provided by the embodiments of the present utility model, Figure 3 Fig. 3 is another structural schematic view of a tappet provided by the embodiments of the present utility model, Figure 4 Fig. 4 is another structural schematic view of a tappet provided by the embodiments of the present utility model. With reference to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the tappet provided by the embodiments of the present utility model comprises a tappet body 10 and a base plate 20. One end of the tappet body 10 is fixedly connected with the base plate 20, and the other end of the tappet body 10 has a receiving cavity 11, which is used for accommodating a push rod. In addition, the tappet body 10 also has a debris passage 12, the inlet of the debris passage 12 is communicated with the receiving cavity 11, the outlet of the debris passage 12 is located on the side surface of the tappet body 10, and the outlet of the debris passage 12 is located between the inlet of the debris passage 12 and the base plate 20, and the debris passage 12 is used for discharging impurities in the receiving cavity 11. The impurities mentioned herein are the debris generated by the friction between the tappet body 10 and the push rod, and the impurities can also include other granular objects.

[0025] In the process of driving the push rod to move, the debris generated by the relative friction between the push rod and the inner wall of the receiving cavity 11 in the tappet will be discharged to the side surface of the tappet through the debris passage 12, so as to prevent the debris from causing abrasion between the part of the push rod located in the receiving cavity 11 and the inner wall of the receiving cavity 11, reduce the abrasive friction between the tappet body 10 and the push rod, improve the stability of the work of the tappet body 10 and the push rod, and prolong the service life of the tappet body 10 and the push rod. Thus, the probability of abnormal conditions of the engine valve train structure is reduced, and the stability of the work of the engine valve train structure is improved.

[0026] In addition, the tappet is arranged in the vertical direction during operation, the accommodating cavity 11 is located above the tappet, and the outlet of the debris passage 12 is arranged on the side of the cylinder 10, so that the debris can be prevented from entering between the camshaft and the base and affecting the stability of the operation of the camshaft. The outlet of the debris passage 12 is arranged between the inlet of the debris passage 12 and the base 20, and the outlet of the debris passage 12 is also arranged below the inlet of the debris passage 12 along the axis direction of the cylinder 10, so that the debris can be discharged from the outlet of the debris passage 12.

[0027] In the above embodiment, the inner diameter of the debris passage 12 is R2, and the diameter of the cylinder 10 is R1. The inner diameter R2 of the debris passage 12 can be 0.01-0.1 times the diameter R1 of the cylinder 10. In this way, the strength of the cylinder 10 can be ensured, and the debris in the accommodating cavity 11 can be discharged in time through the debris passage 12. If the inner diameter R2 of the debris passage 12 is less than 0.01R1, the size of the debris generated between the push rod and the inner wall of the accommodating cavity 11 can be greater than the inner diameter R2 of the debris passage 12, so that the debris stays in the accommodating cavity 11 for too long time, and abrasive particles are generated between the cylinder 10 and the push rod, which causes great wear of the cylinder 10 and the push rod. If the inner diameter R2 of the debris passage 12 is greater than 0.1R1, the strength of the cylinder 10 is reduced, and the service life of the cylinder 10 is also affected.

[0028] In an embodiment, the cylinder 10 and the base 20 can be integrally formed. Alternatively, the cylinder 10 and the base 20 can be prepared separately and then connected by a welding process. Alternatively, the cylinder 10 and the base 20 can also be connected by a rotary connection, which is not limited here. The diameter of the base 20 is greater than the diameter of the cylinder 10, and the diameter of the base 20 is relatively large so as to cooperate with the camshaft.

[0029] In order to ensure that the impurities in the accommodating cavity 11 do not stay in the debris passage 12 and improve the efficiency of the debris passage 12 in discharging the impurities, the distance between the debris passage 12 and the base 20 gradually decreases along the path from the inlet of the debris passage 12 to the outlet of the debris passage 12, so as to ensure that the path inside the debris passage 12 is downwardly inclined after the impurities enter the debris passage 12 through the inlet of the debris passage 12.

[0030] In the above embodiment, the inlet of the debris passage 12 is arranged at the bottom of the accommodating cavity 11. The accommodating cavity 11 can be U-shaped or V-shaped, and the debris passage 12 is actually arranged at the position closest to the base 20 in the accommodating cavity 11, and this position is the position where the impurities are accumulated in the accommodating cavity 11. In this way, the impurities can stay in the accommodating cavity 11 for a short time, and the influence of the impurities on the cylinder 10 and the push rod is reduced.

[0031] In the above embodiments, the number of the chip removal channels 12 in the column body 10 can be one, two, three, or four, or the like, as long as the strength of the column body 10 is not affected. When the number of the chip removal channels 12 is two, the two chip removal channels 12 can be symmetrically arranged on the column body 10, and the axis of symmetry of the two chip removal channels 12 can be the axis of the column body 10. When the number of the chip removal channels 12 is three, the three chip removal channels 12 can be uniformly distributed around the axis of the column body 10.

[0032] The chip removal channels 12 can have various forms, such as straight lines, spirals, arcs, or other irregular shapes. Specifically, with reference to Figure 1 and Figure 2 , the chip removal channels 12 can be straight lines. In this way, the impurities in the accommodating cavity 11 can be discharged to the outside of the plunger from the shortest distance.

[0033] With reference to Figure 4 , the chip removal channels 12 can have irregular shapes. The chip removal channels 12 can be divided into two parts. The axis of the first part of the channel coincides with the axis of the column body 10, and the axis of the second part of the channel is arranged obliquely relative to the axis of the column body 10. The impurities are quickly discharged from the accommodating cavity 11 through the first part of the channel and then discharged to the outside of the plunger through the second part of the channel. When the chip removal channels 12 have irregular shapes, the chip removal channels 12 can have multiple parts, and the shapes of the multiple parts of the channel can be the same or different.

[0034] In some other embodiments, the inner diameter of the chip removal channels 12 can vary. Specifically, from the inlet of the chip removal channels 12 to the outlet of the chip removal channels 12, the inner diameter of the chip removal channels 12 can gradually increase. At this time, the chip removal channels 12 can be considered to be conical.

[0035] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A tappet, characterized in that The application relates to a push rod, comprising: a column and a base plate; One end of the column is fixedly connected with the base plate, and the other end of the column is provided with a containing cavity for containing a push rod, wherein: The column is further provided with a debris channel, an inlet of the debris channel is communicated with the containing cavity, an outlet of the debris channel is located on the side of the column, and the outlet of the debris channel is located between the inlet of the debris channel and the base plate, and the debris channel is used for discharging impurities in the containing cavity.

2. The plunger of claim 1 wherein, The inner diameter of the debris channel is 0.01-0.1 times of the diameter of the column.

3. The tappet of claim 1 wherein, Along the path from the inlet of the debris channel to the outlet of the debris channel, the distance between the debris channel and the base plate gradually decreases.

4. The tappet of claim 1 wherein, The inlet of the debris channel is arranged at the bottom of the containing cavity.

5. The tappet of claim 1 wherein, The two debris channels are symmetrically arranged.

6. The tappet according to any one of claims 1 to 5, characterized in that The debris channel is linear.

7. The tappet according to any one of claims 1 to 5, characterized in that The debris channel is spiral.

8. The tappet according to any one of claims 1 to 5, characterized in that The debris channel is arc-shaped.

9. The tappet of claim 1 wherein, The column and the base plate are integrally formed.

10. An engine valve train arrangement characterised in that The application further relates to a push rod assembly comprising the push rod.

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