CN212985322U

CN212985322U - Hydraulic tappet

Info

Publication number: CN212985322U
Application number: CN202021541548.4U
Authority: CN
Inventors: 徐维超; 杜茂
Original assignee: Mianyang Huabo Seiko Machinery Co ltd
Current assignee: Mianyang Huabo Seiko Machinery Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-04-16
Anticipated expiration: 2030-07-29

Abstract

The utility model discloses a hydraulic tappet, include: the tappet body and the integrated plunger matched with the tappet body; the free end of the tappet body is provided with a retainer matched with the plunger; the retainer is provided with an arc-shaped end on the end part matched with the plunger; the bottom of the tappet body accommodating cavity is provided with a fixed end matched with the return spring, and a preset distance is reserved between the end face of the fixed end and the one-way valve cover. The hydraulic tappet of the utility model guides the return spring by arranging the fixed end in the high-pressure chamber, prolongs the service life of the hydraulic tappet and ensures the stability of the hydraulic tappet in work; through improving the structure to the protective shroud, guarantee plunger and tappet body complex relative leakproofness, guide, injure, protect the motion of plunger simultaneously, and then guarantee stability, the result of use of hydraulic tappet operation to prolong its life.

Description

Hydraulic tappet

Technical Field

The utility model relates to an engine technical field. More specifically, the present invention relates to a hydraulic tappet.

Background

The hydraulic tappet mainly comprises a tappet body, a plunger, a ball plunger, a one-way valve, a return spring and other parts. When the engine works, when the cam peach point compresses the plunger at the rising stage, the one-way valve is closed, and a very small amount of oil is pressed out from a fit clearance between the tappet body and the plunger, at the moment, the hydraulic tappet can be approximately regarded as an uncompressed rigid body, and an intake valve and an exhaust valve are opened under the supporting action of the rigid body; when the cam peach point is in a return stroke descending stage, the plunger piston is recovered to ascend under the action of the return spring, the volume of the high-pressure cavity is increased to generate negative pressure, oil is supplemented into the high-pressure cavity from the low-pressure cavity, a working cycle is completed, and the purpose of automatically adjusting the valve clearance is achieved.

The existing hydraulic tappet is limited by the structural size, and the return spring is not subjected to guiding limitation in the installation and use processes of the check valve, the tappet body and the piston, so that the accuracy and stability of the hydraulic tappet are limited in the installation process, and meanwhile, the return spring is not enough in the use process, so that the return spring is not only compressed to return, but also needs to bear the circumferential deformation in the compression process, and the service life and the working stability of the hydraulic tappet are influenced;

meanwhile, if the matching degree of the retainer in the prior art and the outer surface of the plunger is not enough, the clearance is large, the oil output is large, the rigidity of the tappet is influenced, the matching degree meets the requirement, the clearance is small, the interference between the tappet body and the plunger in the movement process is large, the service life of the tappet is influenced, and the maintenance cost is improved.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages which will be described later.

To achieve these objects and other advantages in accordance with the purpose of the invention, a hydraulic tappet is provided, including:

the tappet body and the integrated plunger matched with the tappet body;

the one-way valve is arranged between the plunger and the tappet body and is configured to comprise a steel ball and a one-way valve seat covered on the steel ball, a spring is arranged at the bottom of the steel ball and the bottom of the one-way valve seat, and the one-way valve seat is connected with an accommodating cavity in the tappet body through a return spring;

the free end of the tappet body is provided with a retainer matched with the plunger;

the tappet body is provided with an annular limiting groove for fixing the guard ring, and the plunger is provided with an annular clamping groove matched with the guard ring;

the retainer is provided with an arc-shaped end on the end part matched with the plunger;

the bottom of the tappet body accommodating cavity is provided with a fixed end matched with the return spring, and a preset distance is reserved between the end face of the fixed end and the one-way valve cover.

Preferably, the side walls of the tappet body and the plunger are respectively provided with a first oil inlet and a second oil inlet;

and oil grooves communicated with the first oil inlet hole and the second oil inlet hole are formed in the side wall, matched with the tappet body, of the plunger.

Preferably, a third oil inlet hole for oil inlet is formed at the ball head end of the plunger;

the ball head end is also provided with a fixing groove matched with an external rocker arm ball socket;

the plunger is internally provided with a two-section type reducing inner cavity communicated with the accommodating cavity, adjacent inner cavities are connected through a first conical part, and the inner cavity is connected with the third oil inlet through a second conical part;

and a section of the inner cavity matched with the second oil inlet hole is provided with a spiral groove.

Preferably, the one-way valve seat is configured to have a flange cooperating with a defining groove on the plunger, and a guide cooperating with the return spring;

the top of the guide part is provided with an arc inner groove;

the free end of the flanging is provided with an extending part which is parallel to the guide part and used for guiding each return spring.

The utility model has the advantages that the fixing end is arranged in the high-pressure chamber to guide the reset spring, so that the structure is limited in the installation process, and the reset spring is protectively guided in the work process, so that the service life of the reset spring is prolonged, and the stability in the work process is ensured; furthermore, the structure of the guard ring is improved, so that the relative sealing performance of the plunger and the tappet body in matching is guaranteed, the movement of the plunger is guided, limited and protected, the stability and the use effect of the operation of the hydraulic tappet are further guaranteed, and the service life of the hydraulic tappet is prolonged.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a hydraulic tappet according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a retainer according to another embodiment of the present invention;

fig. 3 is a schematic cross-sectional structure view of a one-way valve seat according to another embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It should be noted that in the description of the present invention, the terms indicating the orientation or the positional relationship are based on the orientation or the positional relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected," may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements.

Fig. 1 shows a hydraulic tappet implementation according to the present invention, including:

the plunger body is matched with the plunger in a small clearance mode, and the plunger is of an integrated structure, so that the verticality of the plunger can be effectively guaranteed, the jumping of the plunger is reduced, and abnormal conditions such as assembling and clamping of the plunger and the plunger body caused by plunger processing are prevented; meanwhile, the parts of the whole hydraulic tappet are reduced, so that the processing cost and the assembly cost are reduced, and the precision of the hydraulic tappet is higher;

the one-way valve 3 is arranged between the plunger and the tappet body and is configured to comprise a steel ball 4 and a one-way valve seat 5 covered on the steel ball 4, a spring 6 is arranged at the bottom of the steel ball and the one-way valve seat, the one-way valve seat is connected with an accommodating cavity in the tappet body through a return spring 7, in the structure, a fourth oil inlet hole 22 communicated with the accommodating cavity is arranged below the plunger, a groove body for installing and limiting the one-way valve seat is arranged below the plunger, and the steel ball for plugging the fourth oil inlet hole is arranged on the one-way valve seat; the bottom of the accommodating cavity of the tappet body is provided with a return spring, and the upper end of the return spring is abutted against or sleeved on the one-way valve seat; the one-way valve is preferably sleeved (inserted) in the reset spring, so that the connection between the reset spring and the one-way valve seat is more stable, the one-way valve seat is prevented from falling off from the upper end of the reset spring, and the fourth oil inlet hole is guaranteed to be plugged and opened by the steel ball, the central axis of the tappet body and the central axis of the plunger are on the same straight line, a high-pressure chamber for containing a hydraulic medium is arranged between the lower end of the plunger and the lower end of the tappet body, specifically, the lower end of the tappet body is closed, the lower end of the plunger is installed in the tappet body, and is higher than the bottom surface of the tappet body, so that a certain gap is formed between the lower end of the plunger and the bottom surface of the tappet body, and the gap is the; the plunger piston can move up and down in the tappet body, the plunger piston cannot rotate in the tappet body, the fourth oil inlet hole is positioned at the bottom of the plunger piston, so that an inner cavity 16 inside the plunger piston is communicated with the high-pressure chamber through the fourth oil inlet hole, and when the oil pressure in the inner cavity of the plunger piston reaches a certain degree, engine oil can enter the high-pressure chamber through the fourth oil inlet hole;

the free end of the tappet body is provided with a guard ring 8 matched with the plunger, and the upper end of the inner wall of the tappet body is relatively sealed and matched with the outer wall of the plunger through the guard ring, so that a space formed between the inner wall of the tappet body and the outer wall of the plunger is a relatively sealed chamber, and the inner wall of the tappet body and the outer wall of the plunger can be mutually interfered to form an integrated structure;

the tappet body is provided with an annular limiting groove 9 for fixing a protective ring, the plunger is provided with an annular clamping groove 10 matched with the protective ring, the protective ring is usually fixed on the annular limiting groove in a welding mode, the annular structure is adopted to ensure that the matching degree of the protective ring and the outer wall of the tappet body is better, under the structure, the protective ring can be provided with a matched annular bent wall yielding part 27 at the position matched with the upper edge of the annular limiting groove, one end matched with the plunger is provided with an inclined part 28, and the structure of the arc-shaped clamping groove ensures that the stability of the matching of the protective ring and the outer structure of the tappet body is better, so that a certain sealing effect can be achieved, and the vertical movement of the plunger is not influenced;

the end part of the guard ring matched with the plunger is provided with an arc-shaped end 11, so that the surface of the plunger is not damaged and blocked in the movement process of the plunger through the arc-shaped end, the stability of the operation of the plunger is ensured, and the relative sealing performance of the inner part of the guard ring when the guard ring does not work is ensured;

the bottom of the tappet body accommodating cavity is provided with a fixed end 12 matched with the return spring, a preset distance is arranged between the end surface of the fixed end and the one-way valve cover, the matched fixed end is arranged in the accommodating cavity and matched with a guide part on the one-way valve cover, the compression and the resilience of the return spring in the working process are guided and limited, and the compression and the resilience are limited mutually, so that the matching stability of the structure in the installation process is ensured, meanwhile, the extension length of the plunger is not influenced when the return spring is compressed or restored through the arrangement of the preset distance, the running stability of the equipment is ensured, meanwhile, any improvement on the equipment can be avoided, when the cam peach point compresses the plunger in the lift ascending stage in the working process of the engine, the plunger moves downwards, the return spring and the one-way valve spring are both compressed, and the steel ball is tightly pressed on the outlet end of the fourth oil inlet hole, at the moment, the fourth oil inlet hole is closed, a small amount of engine oil is pressed out from a fit clearance between the tappet body and the plunger, the hydraulic tappet can be approximately regarded as an uncompressed rigid body, and the intake valve and the exhaust valve are opened under the supporting action of the rigid body. When the cam peach point is in a return stroke descending stage, the plunger returns to ascend under the action of the return spring, the volume of the high-pressure chamber is increased to generate negative pressure, the pressure in the high-pressure chamber is smaller than the pressure in the plunger, the steel ball is pushed downwards, the one-way valve spring is compressed, the fourth oil inlet is opened, engine oil in the plunger enters the high-pressure chamber through the fourth oil inlet, a working cycle is completed, and the purpose of automatically adjusting the valve clearance is achieved. When the valve mechanism is abraded after long-term operation, the plunger automatically stretches to make up the abrasion clearance generated by the valve mechanism, so that the trouble and inconvenience of frequently manually adjusting the valve clearance can be avoided. In the scheme, the fixed end is arranged in the high-pressure chamber to guide the return spring, so that the structural member is limited in the installation process, and meanwhile, the return spring is guided in a protective manner in the working process, so that the service life of the return spring is prolonged, and the working stability of the return spring is ensured; furthermore, the structure of the guard ring is improved, so that the relative sealing performance of the plunger and the tappet body in matching is guaranteed, the movement of the plunger is guided, limited and protected, the stability and the use effect of the operation of the hydraulic tappet are further guaranteed, and the service life of the hydraulic tappet is prolonged.

In another example, as shown in fig. 1, a first oil inlet hole 13 and a second oil inlet hole 14 are respectively formed on the side walls of the tappet body and the plunger;

the plunger and the tappet body are matched with each other, oil grooves 15 communicated with the first oil inlet hole and the second oil inlet hole are formed in the side walls, the first oil inlet hole and the second oil inlet hole are matched with each other, external oil is sucked into the inner cavity in the structure, and the oil grooves are used for providing lubricating oil for the second oil inlet hole and have certain capacity, so that the plunger and the tappet body are continuous.

In another example, as shown in fig. 1, a ball end of the plunger is provided with a third oil inlet hole 17 for oil inlet;

the ball head end is also provided with a fixing groove 18 matched with an external rocker arm ball socket, and the top of the plunger is spherical and is mainly used for contacting with the rocker arm ball socket; the third oil inlet hole on the ball head is positioned at the top of the plunger, and the straight line of the third oil inlet hole is in the same straight line with the central axis of the plunger, so that oil from the small hole of the rocker ball socket enters the inner cavity of the plunger through the third oil inlet hole; a ball head outer groove (fixing groove) is further formed in the outer wall of the plunger and is located below the top of the plunger, and a clamping piece assembled on the rocker arm ball socket is assembled on the ball head outer groove;

the plunger is internally provided with a two-section type reducing inner cavity 16 communicated with the containing cavity, the adjacent inner cavities are further connected through a first conical part 19, the inner cavity is further connected with the third oil inlet through a second conical part 20, the internal oil quantity of the plunger is controllable through the structural design of the reducing inner cavity, and meanwhile, the conveying pressure after oil is sucked is controlled;

the inner cavity is provided with a spiral groove 21 at one section matched with the second oil inlet, and the conveying pressure and the flow rate of the quality inside the inner cavity can be effectively controlled by the spiral groove, so that the quick switching of different changing positions in the working process of the plunger in the using process is ensured, and the running stability of the plunger is ensured.

In another example, as shown in fig. 3, the one-way valve seat is configured with a flange 23 cooperating with the defining groove on the plunger, and a guide 24 cooperating with the return spring, the position of the return spring being defined and guided by the cooperation of the flange and the guide;

the top of the guide part is provided with an arc inner groove 25, the function of the guide part is that the surface of the guide part has elastic deformation capacity, the structure can be matched with the fixed end, the overall height of the equipment is not changed, when the return spring and the one-way valve seat are pressed into the return spring mounting groove of the accommodating cavity, the fixed end is just pressed into the arc inner groove, and the space height of the plunger and the tappet body can be changed;

the free end of the flanging is provided with an extending part 26 which is parallel to the guiding part and used for guiding each return spring, the effect of the extending part is that the return spring arranged on the one-way valve seat is further limited and guided through the design of the extending part, and then the compression of the return spring is ensured in a controllable interval, and the service life and the working stability of the return spring are further ensured.

The above embodiments are merely illustrative of a preferred embodiment, but not limiting. When the utility model is implemented, the proper replacement and/or modification can be carried out according to the requirements of users.

The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the applications listed in the specification and the examples. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A hydraulic tappet characterized by comprising:

the tappet body and the integrated plunger matched with the tappet body;

2. The hydraulic tappet according to claim 1, wherein the side walls of the tappet body and the plunger are respectively provided with a first oil inlet hole and a second oil inlet hole;

3. The hydraulic tappet of claim 1, wherein the ball end of the plunger is provided with a third oil inlet hole for oil intake;

4. The hydraulic tappet of claim 3, wherein the one-way valve seat is configured with a flange that mates with a defined groove on the plunger, and a guide that mates with a return spring;

the top of the guide part is provided with an arc inner groove;