CN220185194U - Tappet assembly, valve distribution mechanism and engine - Google Patents

Abstract

The utility model provides a tappet assembly, a valve distribution mechanism and an engine, relates to the technical field of engines, and is used for solving the technical problem of high abrasion of the tappet assembly, wherein the tappet assembly comprises a sleeve with two open ends and a tappet; the sleeve is used for being connected with the engine body of the engine and comprises a spiral guide part; the tappet comprises a connecting part, the tappet is arranged in the sleeve, the connecting part is arranged in the guide part in a sliding way, one end of the tappet is used for being connected with the cam, and the other end of the tappet is used for being connected with the push rod; when the cam applies a force to the tappet, the connecting portion moves along the guide portion, so that the tappet moves rotationally upward along the guide portion. The tappet can rotate to form autorotation while moving up and down along the direction perpendicular to the cam, friction between the tappet and the cam is reduced, abrasion degree of the tappet is further reduced, and performance of the valve distribution mechanism is improved.

Description

Tappet assembly, valve distribution mechanism and engine

Technical Field

The embodiment of the utility model relates to the technical field of engines, in particular to a tappet assembly, a valve mechanism and an engine.

Background

The cam shaft is an important part for controlling the opening and closing of the valve in the reciprocating engine, and is provided with a cam matched with the tappet. In the process of cam rotation, the cam rotation process applies acting force to the tappet to push the tappet to move up and down. The push rod or the valve rod is pushed to move up and down by the up and down movement of the tappet.

Because the eccentric distance between the axis of the tappet shaft and the center of the cam shaft is a, and a is a numerical value larger than zero, an eccentric moment is formed, and the eccentric moment can drive the tappet to move up and down. However, when the cam contacts the tappet, the tappet is easy to wear, the service life of the tappet is reduced, and the performance of the valve distribution mechanism is affected.

Disclosure of Invention

In view of the above problems, embodiments of the present utility model provide a tappet assembly, a valve actuating mechanism, and an engine, which can reduce wear of a tappet and improve performance of the valve actuating mechanism.

In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions:

a first aspect of an embodiment of the present utility model provides a tappet assembly, comprising:

a sleeve with two open ends, wherein the sleeve is used for being connected with a machine body of an engine and comprises a spiral guide part;

the tappet comprises a connecting part, the tappet is arranged in the sleeve, the connecting part is arranged in the guiding part in a sliding way, one end of the tappet is used for being connected with the cam, and the other end of the tappet is used for being connected with the push rod;

when the cam applies a force to the tappet, the connecting portion moves along the guide portion, so that the tappet moves rotationally upward along the guide portion.

In one possible implementation, the guide comprises a helical guide groove;

the guide slot includes a first end and a second end, the first end being proximate the cam; the second end is arranged at one end of the first end, which is away from the cam, and the second end is arranged at an interval with the top surface of the sleeve.

In one possible implementation, the guide groove penetrates the sleeve in a thickness direction of the sleeve.

In one possible implementation manner, a notch is further formed on the sleeve, the notch is connected with the first end portion, and the notch penetrates through the sleeve along the axial direction of the sleeve.

In one possible implementation, the line connecting the first end and the second end is parallel to the axis of the sleeve.

In one possible implementation, the connection portion includes a pin fixedly connected to the tappet.

In one possible implementation manner, the tappet is provided with a first positioning hole, and the pin shaft is fixedly connected in the first positioning hole.

A second aspect of an embodiment of the present utility model provides a valve train including: a pushrod, cam, and tappet assembly of the first aspect; the tappet assembly is positioned between the push rod and the cam;

one end of the push rod, which is close to the cam, is connected with a tappet of the tappet assembly;

the cam is contacted with one end of the tappet assembly, which is away from the push rod, and drives the tappet assembly to drive the push rod to axially move.

In one possible implementation, a second positioning hole is formed in one end, close to the push rod, of the tappet; the push rod is inserted into the second positioning hole.

A third aspect of an embodiment of the utility model provides an engine comprising the valve train provided in the second aspect.

In the tappet assembly, the valve distribution mechanism and the engine provided by the embodiment of the utility model, when the cam applies acting force to the tappet, the connecting part moves along the guide part, so that the tappet moves upwards along the guide part in a rotating way. The tappet can rotate to form autorotation while moving up and down along the direction perpendicular to the cam, friction between the tappet and the cam is reduced, abrasion degree of the tappet is further reduced, and performance of the valve distribution mechanism is improved.

In addition to the technical problems, technical features constituting the technical solutions, and beneficial effects caused by the technical features of the technical solutions described above, other technical problems that the tappet assembly, the valve actuating mechanism, and the engine can solve, other technical features included in the technical solutions, and beneficial effects caused by the technical features provided by the embodiments of the present utility model will be described in further detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a part of an engine according to an embodiment of the present utility model;

FIG. 2 is a schematic structural view of a sleeve according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a tappet according to an embodiment of the present utility model.

Reference numerals illustrate:

100: a tappet assembly;

110: a sleeve;

111: a guide part;

112: a first end;

113: a second end;

114: a notch;

120: a tappet;

121: a connection part;

122: a first positioning hole;

123: a boss;

124: a second positioning hole;

200: a cam;

300: a push rod;

400: a body;

410: and (5) mounting holes.

Detailed Description

As described in the background art, the inventor researches that the problem of serious abrasion of the tappet in the related art is caused by that the bottom surface of the tappet is inflexible to rotate during the actual operation process due to the roughness of the tappet and the cam, the machining error of the machine body and the like, so that the abrasion of the tappet is caused, and the service life of the tappet is reduced.

In view of the above technical problems, embodiments of the present utility model provide a tappet assembly, a valve actuating mechanism, and an engine, in which when a cam applies an acting force to a tappet, a connecting portion moves along a guiding portion, so that the tappet moves upwards along the guiding portion in a rotating manner. The tappet can rotate to form autorotation while moving up and down along the direction perpendicular to the cam, friction between the tappet and the cam is reduced, abrasion degree of the tappet is further reduced, and performance of the valve distribution mechanism is improved.

In order to make the above objects, features and advantages of the embodiments of the present utility model more comprehensible, the technical solutions of the embodiments of the present utility model will be described clearly and completely with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 3, an embodiment of the present utility model provides a tappet assembly 100, wherein the tappet assembly 100 is applied to an engine, and is used as a transmission member to transmit the acting force of a cam 200 of the engine to a push rod 300, so as to push the push rod 300 to move up and down in a direction away from the cam 200. At the same time, it is also necessary to receive the lateral force applied by the cam 200 and transmit the lateral force to the body 400 or the cylinder head.

Referring to fig. 1, a tappet assembly 100 includes a sleeve 110 and a tappet 120. Wherein the sleeve 110 is adapted to be coupled to a body 400 of an engine. As an example, the engine block 400 of the engine has a mounting hole 410, and the sleeve 110 is mounted in the mounting hole 410 with an interference fit with the mounting hole 410, preventing the sleeve 110 from moving, and improving the safety of the tappet assembly 100.

Referring to fig. 2 and 3, the sleeve 110 has both ends open, i.e., the sleeve 110 has a top opening and a bottom opening in the axial direction of the sleeve 110.

The sleeve 110 includes a spiral guide 111, wherein the spiral is a forward spiral or a reverse spiral, and the embodiment is not specifically limited herein.

The tappet 120 is disposed within the sleeve 110, i.e., the sleeve 110 is sleeved over the outer surface of the tappet 120. The tappet 120 includes a connecting portion 121, and the connecting portion 121 is slidably disposed in the guiding portion 111 and is used in cooperation with the guiding portion 111. The tappet 120 has a cylindrical shape, and an end of the tappet 120 facing the cam 200 may include a cylindrical boss 123, and the boss 123 may be used with the engine body 400 of the engine.

One end of the tappet 120 may extend outside the sleeve 110 and be connected with the cam 200. The other end of the tappet 120 is adapted to be connected to a push rod 300. So configured, the tappet 120 can be used as a transmission member to transmit the force of the cam 200 to the push rod 300. For example, when the cam 200 applies a force to the tappet 120, the connecting portion 121 moves along the guiding portion 111, so that the tappet 120 moves upward along the guiding portion 111 in a rotating manner, i.e. the tappet 120 moves upward along the axial direction of the sleeve 110 while rotating, and further, the push rod 300 moves downward along the axial direction of the sleeve 110. In the above process, the friction force between the tappet 120 and the cam 200 can be reduced, so that the abrasion degree of the tappet 120 is reduced, and the performance of the valve actuating mechanism is improved.

In one possible embodiment, the guide 111 comprises a helical guide groove; the guide groove can be a blind groove or other structures. As an example, the guide groove penetrates the sleeve 110 in the thickness direction of the sleeve 110. With this arrangement, the mounting of the lifter 120 can be facilitated.

The guide slot includes a first end 112 and a second end 113. The guide groove has a first end 112 and a second end 113 disposed opposite to each other in the axial direction of the sleeve 110. That is, the first end 112 is the bottom end of the guide slot and the second end 113 is the top end of the guide slot.

The first end 112 is adjacent to the cam 200, the second end 113 is disposed at an end of the first end 112 facing away from the cam 200, and the second end 113 is spaced from the top surface of the sleeve 110. The length of the guide groove can be reasonably set, so that the vertical moving path of the tappet 120 along the axial direction of the sleeve 110 can be ensured, and the performance of the valve distribution mechanism is ensured.

It should be noted that the first end 112 and the second end 113 may be located on the same side of the axis of the sleeve 110, or may be located on two sides of the axis of the sleeve 110.

As an example, the connection line between the first end 112 and the second end 113 is parallel to the axis of the sleeve 110, so that the guide groove at least surrounds one circle of the outer circumferential surface of the sleeve 110, and thus, the arrangement can provide a sufficient guide path for the connection portion 121, and further, the up-and-down movement path of the tappet 120 along the axis direction of the sleeve 110 can be ensured, and the performance of the valve actuating mechanism is ensured.

In one possible embodiment, the sleeve 110 is further provided with a notch 114, and the notch 114 is disposed at an end of the first end 112 facing away from the second end 113 and is connected to the first end 112.

The notch 114 penetrates the sleeve 110 in the axial direction of the sleeve 110. In the installation process, the connecting portion 121 can be moved from the notch 114 to the first end 112, so that the quick installation of the tappet 120 and the sleeve 110 is completed, and the installation difficulty of the sleeve 110 and the tappet 120 is simplified.

In one possible embodiment, the connection 121 comprises a pin fixedly attached to the tappet 120. As one example, the pin shaft is welded to the outer surface of the tappet 120. As another example, the tappet 120 is provided with a first positioning hole 122, and an axis of the first positioning hole 122 is perpendicular to an axis of the tappet 120. The pin is fixedly coupled within the first positioning hole 122, for example, the pin may be welded within the first positioning hole 122. Alternatively, the pin is an interference fit with the first locating hole 122.

Embodiments of the present utility model also provide a valve train comprising a pushrod 300, a cam 200, and the tappet assembly 100 described in any of the embodiments above. The valve train also includes a camshaft (not shown) over which the cam 200 may be sleeved.

The tappet assembly 100 is located between the push rod 300 and the cam 200; one end of the push rod 300, which is close to the cam 200, is connected with the tappet 120 of the tappet assembly 100; the cam 200 contacts an end of the tappet assembly 100 facing away from the push rod 300 and drives the tappet assembly 100 to drive the push rod 300 to move along the axial direction of the push rod 300.

When the cam shaft works, the cam shaft drives the cam 200 to rotate, the cam 200 can perform eccentric motion, and when the cam 200 contacts the tappet 120 of the tappet assembly 100, acting force of the cam 200 of the engine can be transmitted to the push rod 300, so that the push rod 300 is pushed to move up and down along the direction deviating from the cam 200. At the same time, it is also necessary to receive the lateral force applied by the cam 200 and transmit the lateral force to the body 400 or the cylinder head.

When the cam 200 contacts the tappet 120 of the tappet assembly 100, the connecting portion 121 of the tappet 120 can move along the guiding portion 111 of the sleeve 110, so that the tappet 120 moves upwards along the guiding portion 111 in a rotating manner, that is, the tappet 120 moves upwards along the axial direction of the sleeve 110 while rotating, and further, the push rod 300 moves downwards along the axial direction of the sleeve 110. In the process, the friction force between the tappet 120 and the cam 200 can be reduced, the abrasion degree of the tappet 120 is further reduced, and the performance of the valve distribution mechanism is improved, so that the fuel consumption of the engine can be effectively reduced, and the economical efficiency of the engine is improved

In one possible embodiment, the tappet 120 is provided with a second positioning hole 124 near the first end of the push rod 300. The axis of the second positioning hole 124 is parallel to the axis of the tappet 120.

The push rod 300 is inserted into the second positioning hole 124, so as to realize the connection between the push rod 300 and the tappet 120.

The embodiment of the utility model also provides an engine, which comprises the valve mechanism described in any embodiment. The structure and function of the valve actuating mechanism are shown in the above embodiments, and the description of this embodiment is omitted herein.

In this specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

Generally, terms should be understood at least in part by use in the context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, at least in part depending on the context. Similarly, terms such as "a" or "an" may also be understood to convey a singular usage or a plural usage, depending at least in part on the context.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense so that "on … …" means not only "directly on something" but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, or indirectly connected through intermediaries, for example, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A tappet assembly, comprising:

a sleeve with two open ends, wherein the sleeve is used for being connected with a machine body of an engine and comprises a spiral guide part;

the tappet comprises a connecting part, the tappet is arranged in the sleeve, the connecting part is arranged in the guiding part in a sliding way, one end of the tappet is used for being connected with the cam, and the other end of the tappet is used for being connected with the push rod;

when the cam applies a force to the tappet, the connecting portion moves along the guide portion, so that the tappet moves rotationally upward along the guide portion.

2. The tappet assembly of claim 1, wherein the guide portion includes a helical guide slot;

the guide slot includes a first end and a second end, the first end being proximate the cam; the second end is arranged at one end of the first end, which is away from the cam, and the second end is arranged at an interval with the top surface of the sleeve.

3. The tappet assembly of claim 2, wherein the guide slot extends through the sleeve in a thickness direction of the sleeve.

4. The tappet assembly of claim 2, wherein the sleeve is further provided with a notch, the notch is connected to the first end, and the notch extends through the sleeve in an axial direction of the sleeve.

5. The tappet assembly of claim 2, wherein the line connecting the first and second ends is parallel to the axis of the sleeve.

6. The tappet assembly of any one of claims 1-5, wherein the connection portion includes a pin fixedly attached to the tappet.

7. The tappet assembly of claim 6, wherein the tappet is provided with a first locating hole, and the pin shaft is fixedly connected within the first locating hole.

8. A valve train comprising a pushrod, a cam, and the tappet assembly of any one of claims 1-7; the tappet assembly is positioned between the push rod and the cam;

one end of the push rod, which is close to the cam, is connected with a tappet of the tappet assembly;

the cam is contacted with one end of the tappet assembly, which is away from the push rod, and drives the tappet assembly to drive the push rod to axially move.

9. The valve train of claim 8, wherein the tappet is provided with a second locating hole near an end of the pushrod; the push rod is inserted into the second positioning hole.

10. An engine comprising a valve train according to claim 8 or 9.