CN212985321U

CN212985321U - Hydraulic tappet

Info

Publication number: CN212985321U
Application number: CN202021538624.6U
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; and a check valve disposed between the plunger and the tappet body, configured to include a steel ball and a check valve seat capped thereon, the check valve seat configured to have a flange fitted with the defining groove on the plunger; the free end of the flanging is provided with an extending part which is parallel to the guide part and is used for guiding each return spring; the plunger and the tappet body are further fixed through a clamp spring arranged on the tappet body, and the clamp spring is configured to be of a wave-shaped structure with a notch. The utility model discloses a hydraulic tappet is injectd through the structure of one-way spring seat, has guaranteed the stability of reset spring operation, is injectd through the structure to the jump ring simultaneously for its installation operation is more simple, and vibrations and noise in the plunger motion can effectively reduce simultaneously, reduce the damage that its hard contact caused equipment parts, effectively 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.

And current hydraulic tappet, its tappet body links into integral type structure through protective shroud or jump ring with the plunger usually, adopts the protective shroud to make its volume increase itself, influences the miniaturization of part, and adopts its work center pin of jump ring to contact, extrude the jump ring when up-and-down motion, and this makes the wearing and tearing of part in the motion can increase, produces noise and vibrations.

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;

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

an arc-shaped inner groove is formed in the top of the guide part;

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

the plunger and the tappet body are further fixed through a clamp spring arranged on the tappet body, and the clamp spring is configured to be of a wave-shaped structure with a notch;

and the outer side wall of the plunger is provided with a clamping part matched with the clamp spring.

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, and the fixing groove is communicated with the clamping part;

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 plurality of groups of annular grooves are formed in the side wall of the inner cavity.

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

The utility model discloses include following beneficial effect at least, an one of which, the utility model discloses a carry out institutional advancement to one-way disk seat for its one-way disk seat among the prior art, its limiting, the guidance nature to reset spring is better, and the stability of each part motion is better in the equipment.

And secondly, the utility model discloses an adopt the jump ring to go on being connected of tappet body and protective shroud for the volume of equipment itself is controllable, and is injectd at the structure through injecing the protective shroud simultaneously, makes it effectively absorb vibrations, extrusion, the noise that the part produced in the work, guarantees its life.

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 one-way valve seat according to another embodiment of the present invention;

fig. 3 is a schematic side sectional view of the snap spring.

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. 1-3 show a hydraulic tappet realisation according to the present invention, wherein it comprises:

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, a fourth oil inlet hole 8 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 9 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 one-way valve seat is configured to be provided with a flange 10 matched with a limiting groove on the plunger and a guide part 11 matched with the return spring, and the position of the return spring is limited and guided through the matching of the flange and the guide part;

the top of the guide part is provided with an arc inner groove 12, 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 extension part 13 which is parallel to the guide part and is used for guiding each return spring, and the function of the flanging is that the return springs arranged on the one-way valve seats are further limited and guided through the design of the extension parts, so that the compression of the return springs is ensured in a controllable interval, and the service life and the working stability of the return springs are further ensured;

the plunger and the tappet body are further fixed through a clamp spring 14 arranged on the tappet body, and the clamp spring is configured to be of a wave-shaped structure with a notch;

the plunger is provided with a clamping part 15 matched with the clamp spring on the outer side wall, in the structure, an annular fixed groove 16 matched with the clamp spring is arranged on the inner side wall of the free end of the plunger body, after the plunger is arranged in the plunger body, the clamp spring is sleeved on the clamping part of the plunger body and is inwards compressed to ensure that the outer edge of the clamp spring extends into the annular fixed groove, the inner edge of the clamp spring is just clamped in the clamping part to connect the plunger body and the plunger body into an integral structure, in the process, the clamp spring with a gap is selected to ensure better compressibility and simpler installation, the structural stability of the plunger body and the plunger body is better after installation, and the clamp spring with a wavy shape is adopted, the clamp spring can play a role of buffering in the up-and-down motion process of the plunger, namely the stability of a device connection structure can be ensured, and simultaneously, the vibration and noise generated by the motion of the plunger body can be relieved in the, thereby ensuring the stability of the equipment operation. In the working process of the engine, when the cam peach point compresses the plunger at the lift ascending stage, the plunger moves downwards, the return spring and the one-way valve spring are both compressed, the steel ball is tightly propped against the outlet end of the fourth oil inlet hole, the fourth oil inlet hole is closed at the moment, a very small amount of engine oil is pressed out from the fit clearance between the tappet body and the plunger, the hydraulic tappet can be approximately regarded as an uncompressed rigid body, and the air inlet valve and the air outlet 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 another example, as shown in fig. 1, the side walls of the tappet body and the plunger are respectively provided with a first oil inlet hole 17 and a second oil inlet hole 18;

the plunger and the tappet body are matched, the side wall is provided with an oil groove 19 communicated with the first oil inlet hole and the second oil inlet hole, external oil is sucked into the inner cavity through the matching of the first oil inlet hole and the second oil inlet hole in the structure, and the oil groove is used for providing lubricating oil for the second oil inlet hole and has certain capacity so as to have continuity.

In another example, as shown in fig. 1, a ball end of the plunger is provided with a third oil inlet hole 20 for oil inlet;

the ball head end is also provided with a fixing groove 21 matched with an external rocker arm ball socket, the fixing groove is communicated with the clamping part, 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; the outer wall of the plunger is also provided with a ball head outer groove (fixing groove) which is positioned below the top of the plunger, so that a clamping piece assembled on the rocker arm ball socket is assembled on the ball head outer groove, and the fixing groove is further communicated with the clamping part, so that the plunger has smaller interference in motion, better motion smoothness, controllable space occupancy rate of equipment and smaller volume;

the plunger is internally provided with a two-section type reducing inner cavity 9 communicated with the containing cavity, the adjacent inner cavities are connected through a first conical part 22, the inner cavity is connected with the third oil inlet through a second conical part 23, the internal oil quantity 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 side wall is provided with a plurality of groups of annular grooves 24, and the conveying pressure and the flow rate of the quality inside the inner cavity can be effectively controlled through the arrangement of the annular grooves, 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, a fixed end 25 matched with the return spring is arranged at the bottom of the tappet body accommodating cavity, and the end surface of the fixed end is spaced from the one-way valve cover by a predetermined distance;

wherein, the top of the fixed end is provided with an arc part 26 matched with the inner groove. In the structure, the fixed end which is matched with the containing cavity is arranged in the containing cavity and is matched with the guide part on the one-way valve cover, the compression and the restitution of the return spring in operation are guided and defined, one to the other, thereby ensuring the matching stability of the structure in the installation process, simultaneously ensuring that the extension length of the plunger is not influenced when the one-way valve cover is compressed or recovered through the preset distance and the arrangement of the inner grooves on the one-way valve cover, i.e. the fixed end can be extended into the inner groove when being compressed, thus ensuring the stability of the operation of the equipment and simultaneously not improving the equipment any more, in the proposal, by arranging the fixed end in the high-pressure chamber, the reset spring is guided, so that the structural member is conveniently limited in the installation process, and meanwhile, the reset spring is protectively guided in the work process, the service life of the reset spring is prolonged, and the stability in the work process of the reset 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.

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;

an arc-shaped inner groove is formed in the top of the guide part;

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 2, wherein the ball end of the plunger is provided with a third oil inlet hole for oil intake;

4. The hydraulic tappet according to claim 1, wherein a fixed end matched with the return spring is arranged at the bottom of the tappet body accommodating cavity, and a preset distance is reserved between the end surface of the fixed end and the one-way valve cover;

the top of the fixed end is provided with an arc-shaped part matched with the inner groove.