CN212716799U

CN212716799U - Cylindrical hydraulic tappet

Info

Publication number: CN212716799U
Application number: CN202021586840.8U
Authority: CN
Inventors: 李琼琼; 王俊
Original assignee: Bengbu Guangrui Machinery Co ltd
Current assignee: Bengbu Guangrui Machinery Co ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-03-16
Anticipated expiration: 2030-08-04

Abstract

The utility model discloses a cylinder form hydraulic tappet relates to hydraulic tappet technical field. The utility model comprises a shell, wherein an inner sleeve is arranged in the shell, a large plunger is arranged in the inner sleeve in a sliding manner, a small plunger is arranged in the large plunger in a sliding manner, a through hole communicated with an oil storage cavity formed by the large plunger and the small plunger is arranged on the small plunger, and a through pipe is fixedly arranged in the through hole; a valve body is also arranged in a cavity formed by the large plunger and the small plunger, a ball head of the valve body is tightly contacted with the port of the through pipe, and a spring is arranged between the valve body and the bottom surface of the large plunger; the end part of the shell is hermetically provided with an end cover to form an oil inlet cavity, and the side surface of the small plunger is provided with a through groove communicated with the oil inlet cavity; and an oil duct communicated with the oil inlet cavity is formed in the side surface of the shell. The utility model discloses the end cover that the casing passes through casing and housing end seal installation constitutes, adopts the components of a whole that can function independently structure to assemble, is convenient for install, is convenient for maintain the inside of hydraulic tappet simultaneously.

Description

Cylindrical hydraulic tappet

Technical Field

The utility model belongs to the technical field of the hydraulic tappet, especially, relate to a cylinder form hydraulic tappet.

Background

If there is no clearance or too small clearance between the engine valve and its transmission part in cold state, when the engine works, the valve is often not closed tightly due to the thermal expansion of the valve and its transmission part, and further the engine compression and the air leakage in working stroke can be caused to reduce the engine power, even the engine can not be started or the valve and the piston collide with each other in serious condition. In the prior art, a reserved valve clearance is usually adopted to solve the problem that the valve is not closed tightly due to thermal expansion, but due to the existence of the valve clearance, an engine can generate impact load and mechanical noise during working. In order to solve the above-mentioned contradiction, people adopt a hydraulic tappet in the engine valve mechanism, and the hydraulic tappet can utilize engine oil with a certain pressure to adjust the length of the hydraulic tappet so as to compensate the E change of parts in the valve mechanism caused by thermal expansion, abrasion, manufacturing error and the like, thereby achieving the purpose of automatically eliminating the valve clearance. The existing hydraulic tappet is of an integral structure, and is inconvenient to disassemble and maintain after being assembled and installed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cylinder form hydraulic tappet, the end cover that the casing passes through casing and housing end seal installation constitutes, adopts the components of a whole that can function independently structure to assemble, is convenient for install, is convenient for maintain hydraulic tappet's inside simultaneously, has solved the problem that current hydraulic tappet is not convenient for maintain.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a cylinder-shaped hydraulic tappet, which comprises a shell, wherein an inner sleeve is arranged inside the shell, a large plunger is arranged in the inner sleeve in a sliding manner, a small plunger is arranged in the large plunger in a sliding manner, meanwhile, a through hole communicated with an oil storage cavity formed by the large plunger and the small plunger is arranged on the small plunger, and a through pipe is fixedly arranged in the through hole; a valve body is further arranged in a cavity formed by the large plunger and the small plunger, a ball head of the valve body is tightly contacted with the port of the through pipe, and a spring is arranged between the valve body and the bottom surface of the large plunger; an end cover is hermetically arranged at the end part of the shell and forms an oil inlet cavity, and a through groove communicated with the oil inlet cavity is formed in the side surface of the small plunger; and an oil duct communicated with the oil inlet cavity is formed in the side surface of the shell.

Furthermore, big plunger and little plunger are cylindric structure, and the inside of big plunger is equipped with the cavity simultaneously, the inside of little plunger is equipped with the oil pocket.

Furthermore, the outer side surface of the shell is provided with an annular groove, and the annular groove is communicated with the oil inlet cavity of the shell through an oil duct.

Furthermore, the inner wall of the inner sleeve and the outer wall of the large plunger are sealed through a sealing ring.

Further, the through groove is formed at the port of the small plunger.

Furthermore, the valve body further comprises a disc body, and a ball head is arranged in the middle of the conical surface on one side of the disc body.

The utility model discloses following beneficial effect has:

the outer shell of the utility model is composed of the shell and the end cover which is sealed and installed at the end part of the shell, and is assembled by adopting a split structure, thereby being convenient for installation and simultaneously being convenient for maintaining the inside of the hydraulic tappet; the cavity that little plunger and big plunger constitute communicates through the siphunculus, and the long-time work of current machine oil is back easily contains impurity, easily causes connecting channel's jam, through the siphunculus convenient to realize that is equipped with dismantles the maintenance.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of the overall cross-sectional structure of the present invention;

fig. 2 is a schematic view of a partial cross-sectional structure of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1-shell, 101-ring groove, 102-oil channel, 2-inner sleeve, 3-end cover, 4-small plunger, 401-through groove, 402-oil cavity, 403-through hole, 5-large plunger, 6-through pipe, 7-valve body, 701-ball head, 8-spring and 9-sealing ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", and the like, indicate positional or positional relationships, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Referring to fig. 1-2, the present invention relates to a cylindrical hydraulic tappet, which includes a casing 1, an inner sleeve 2 is disposed inside the casing 1, a large plunger 5 is slidably mounted in the inner sleeve 2, the inner wall of the inner sleeve 2 and the outer wall of the large plunger 5 are sealed by a sealing ring 9, so as to ensure the sealing performance of the connection, avoid leakage to affect the pressure inside the hydraulic tappet, a small plunger 4 is slidably mounted inside the large plunger 5, a through hole 403 communicated with an oil storage cavity formed by the large plunger 5 and the small plunger 4 is formed on the small plunger 4, and a through pipe 6 is fixedly mounted in the through hole 403;

the large plunger 5 and the small plunger 4 are both of cylindrical structures, a cavity is arranged inside the large plunger 5, an oil cavity 402 is arranged inside the small plunger 4, the cylindrical structures are convenient to process, and different structures are arranged to realize sealing connection more easily in the matching process;

a valve body 7 is also arranged in a cavity formed by the large plunger 5 and the small plunger 4, a ball head of the valve body 7 is tightly contacted with the port of the through pipe 6, and a spring 8 is arranged between the valve body 7 and the bottom surface of the large plunger 5; the valve body 7 comprises a ball head and a disk body, and the ball head is arranged in the middle of the conical surface on one side of the disk body; the ball head is convenient for realizing the sealing connection with the port of the through pipe 6, and the conical surface is convenient for oil to flow out;

the end part of the shell 1 is hermetically provided with the end cover 3 to form an oil inlet cavity, the side surface of the small plunger 4 is provided with a through groove 401 communicated with the oil inlet cavity, and the through groove 401 is positioned at the port of the small plunger 4, so that the blockage of the through groove 401 and the influence on oil inlet caused by the expansion and contraction of the large plunger 5 are effectively avoided; meanwhile, the side surface of the shell 1 is provided with an oil duct 102 communicated with the oil inlet cavity; be equipped with annular 101 on the lateral surface of casing 1, the effectual area that has increased the oil feed through the annular 101 that is equipped with of oil duct 102 intercommunication between the oil feed chamber of annular 101 and casing 1.

The outer shell is composed of the shell 1 and an end cover 3 which is hermetically arranged at the end part of the shell 1, and is assembled by adopting a split structure, so that the installation is convenient, and the maintenance of the interior of the hydraulic tappet is convenient; the cavity that little plunger 4 and big plunger 5 constitute communicates through siphunculus 6, and current machine oil easily contains impurity after long-time work, easily causes connecting channel 6's jam, through the siphunculus 6 convenient to realize dismantlement maintenance that is equipped with.

When the hydraulic tappet just starts to work, because the oil cavity 402 of the small plunger 4 has no oil pressure, the large plunger 5 of the tappet does not extend out, the clearance between the tappet and the valve is large, and the valve generates short-time abnormal sound; along with the operation of the engine, under the action of the oil pressure of the engine, the oil enters the oil cavity 402 in the small plunger 4 through the oil passage in the annular groove 101, the oil pressure is continuously increased and flows into the cavity of the large plunger 5 through the valve body 7, the large plunger 5 extends out, the effective working length of the tappet is increased, and the valve clearance is reduced; because the force generated by the large plunger 5 in the tappet is small and cannot generate the force for compressing the valve spring, when the clearance between the tappet and the valve is small, the tappet does not move any more; meanwhile, due to the action of the tappet inner valve body 7, oil in the large plunger cavity cannot be discharged rapidly, so that the large plunger 5 is kept in the original position and maintains the original length to form rigidity, the valve is pushed to be opened, and abnormal sound of the valve is eliminated.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cylindrical hydraulic tappet comprises a shell (1), and is characterized in that:

an inner sleeve (2) is arranged in the shell (1), a large plunger (5) is slidably mounted in the inner sleeve (2), a small plunger (4) is slidably mounted in the large plunger (5), meanwhile, a through hole (403) communicated with an oil storage cavity formed by the large plunger (5) and the small plunger (4) is formed in the small plunger (4), and a through pipe (6) is fixedly mounted in the through hole (403);

a valve body (7) is further arranged in a cavity formed by the large plunger (5) and the small plunger (4), a ball head of the valve body (7) is tightly contacted with a port of the through pipe (6), and a spring (8) is arranged between the valve body (7) and the bottom surface of the large plunger (5);

an end cover (3) is hermetically installed at the end part of the shell (1) to form an oil inlet cavity, and a through groove (401) communicated with the oil inlet cavity is formed in the side surface of the small plunger (4); meanwhile, an oil duct (102) communicated with the oil inlet cavity is formed in the side face of the shell (1).

2. The hydraulic tappet of claim 1, wherein the large plunger (5) and the small plunger (4) are both cylindrical structures, a cavity is formed inside the large plunger (5), and an oil cavity (402) is formed inside the small plunger (4).

3. The hydraulic tappet of claim 1, wherein an annular groove (101) is formed in the outer side surface of the casing (1), and the annular groove (101) is communicated with an oil inlet cavity of the casing (1) through an oil passage (102).

4. The hydraulic tappet of claim 1, wherein the inner wall of the inner sleeve (2) and the outer wall of the large plunger (5) are sealed by a sealing ring (9).

5. The cylindrical hydraulic tappet according to claim 1, characterised in that the through slot (401) is located at the port of the small plunger (4).

6. The hydraulic tappet of claim 1, wherein the valve body (7) further comprises a disk body, and a ball head is arranged in the middle of the conical surface on one side of the disk body.