CN213205782U - Check valve and hydraulic lash adjuster - Google Patents

Abstract

The utility model relates to a check valve and hydraulic pressure lash adjuster. The check valve comprises a cylindrical valve cover, a check ball and a spiral spring, wherein the check ball is installed in the valve cover, the valve cover is provided with a bottom plate at one end in the axial direction, the spiral spring is abutted between the check ball and the bottom plate in the axial direction, the check valve further comprises a ball seat, the ball seat comprises a support seat part and a guide part, the bottom plate is provided with a guide hole, the support seat part is used for accommodating the bottom of the check ball and is abutted between the check ball and the spiral spring in the axial direction, the guide part extends from one side, back to the check ball, of the support seat part towards the bottom plate on the radial inner side of the spiral spring and is slidably inserted into the guide hole. The utility model discloses a check valve and hydraulic pressure lash adjuster can ensure that the check valve moves more reliably.

Description

Check valve and hydraulic lash adjuster

Technical Field

The utility model relates to a vehicle technical field. Specifically, the utility model relates to a check valve reaches hydraulic pressure lash adjuster including this kind of check valve.

Background

In an internal combustion engine of a motor vehicle, a rocker arm for pushing a valve stem to control opening and closing of a valve is generally provided. The rocker arm is typically driven by a cam to swing about a hydraulic lash adjuster, which automatically adjusts the lash between the cam and the rocker arm through telescopic movement of its plunger within the housing. A typical hydraulic lash adjuster configuration is found, for example, in CN 109386334 a. In such typical constructions, a low pressure chamber for storing liquid is formed in the plunger inner cavity, a high pressure chamber for storing liquid is formed between the plunger bottom and the housing bottom, and the low pressure chamber and the high pressure chamber are communicated through a one-way valve which only allows liquid to flow from the low pressure chamber into the high pressure chamber.

Existing hydraulic lash adjusters typically use a ball check valve that includes a cylindrical bonnet, a spherical check ball, and a coil spring as a resilient return member. One end of the valve cover is closed, the other end of the valve cover is opened, and the spring is abutted between the closed end of the valve cover and the check ball along the axial direction. When the check ball is used, the check ball pushes the spring to reciprocate along the axial direction under the action of the liquid pressure. When the relative positions of the various components of the check valve are incorrect, the spring may tip over, thereby causing the check valve to fail.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to provide a more reliable check valve and hydraulic lash adjuster.

The above technical problem is solved through the check valve according to the utility model discloses a. The check valve comprises a cylindrical valve cover, a check ball and a spiral spring, wherein the check ball is installed in the valve cover, a bottom plate is arranged at one axial end of the valve cover, and the spiral spring is abutted between the check ball and the bottom plate along the axial direction, so that the check ball can move along the axial direction under the action of liquid pressure and spring elasticity. Wherein the check valve further comprises a ball seat having a seating portion that receives a bottom portion of the check ball and abuts between the check ball and the coil spring in an axial direction, and a guide portion that extends from a side of the seating portion facing away from the check ball toward the bottom plate at a radially inner side of the coil spring and is slidably inserted into the guide hole in the axial direction. The ball seat defines a relative positional relationship between the coil spring and the check ball by a seating portion abutting between the check ball and the coil spring, while also defining a relative positional relationship between the ball seat and the valve cover by a guide portion inserted into the guide hole of the base plate. Accordingly, the positional relationship of the check ball and the coil spring with respect to the valve cover is also restricted accordingly. This allows the check ball and the coil spring to not easily deviate from the correct positional relationship with respect to the valve cap when the check ball moves axially within the valve cap.

According to a preferred embodiment of the invention, the receptacle part may have a spherical contour which is convex towards the bottom plate and concave away from the check ball. Such a spherical contour facilitates both a form-fitting accommodation of the spherical check ball on the side facing the check ball and a projection on the other side radially inside the helical spring, so that the relative positional relationship of the helical spring and the ball seat can be restrained by the form-fitting of the projecting portion with the helical spring, and deflection of the helical spring is thus avoided.

According to another preferred embodiment of the invention, the receptacle part, viewed in axial direction, can have a circular peripheral contour. In this case, the bracket portion may further have a flange extending radially outward, and the coil spring may abut the flange in the axial direction. The flange may provide a stable engagement surface for the coil spring. Further preferably, the flange may have a recess for accommodating an end of the helical spring on a side facing the base plate. The end coils of the helical spring can be accommodated in the grooves, thereby ensuring accurate positioning between the helical spring and the socket portion.

According to another preferred embodiment of the present invention, the guide portion may be clearance-fitted with the guide hole, thereby ensuring that the guide portion can smoothly axially slide in the guide hole. Preferably, the guide portion and the guide hole may have a correspondingly shaped cross-section, for example both having a circular cross-section. In this case, the guide portion is formed in a cylindrical shape.

Above-mentioned technical problem still obtains solving through according to the utility model discloses a hydraulic pressure lash adjuster. The hydraulic lash adjuster includes a housing and a plunger having a first end inserted axially into the housing. Wherein the hydraulic lash adjuster further comprises a one-way valve having the above characteristics, the one-way valve being mounted externally of the first end.

Drawings

The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:

FIG. 1 shows a schematic view of a check valve according to an embodiment of the present invention when installed in a hydraulic lash adjuster;

figure 2 shows a cross-sectional view of a one-way valve according to an embodiment of the present invention;

figure 3 shows a perspective view of a valve cover of a one-way valve according to an embodiment of the present invention; and

fig. 4 illustrates a perspective view of a ball seat of a one-way valve according to an embodiment of the present invention.

Detailed Description

Specific embodiments of a check valve and a hydraulic lash adjuster according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, and the invention is not limited to the preferred embodiments described, but rather the scope of the invention is defined by the claims.

According to an embodiment of the present invention, a check valve is provided, which is preferably adapted for a hydraulic lash adjuster in an engine valve train. Fig. 1 shows a schematic cross-sectional view of a check valve 30 according to this embodiment when installed in a hydraulic lash adjuster. As shown in fig. 1, the hydraulic lash adjuster includes a housing 10, a plunger 20, and a check valve 30 according to the present embodiment. The housing 10 and the plunger 20 are each a hollow cylindrical member. The housing 10 has an open end at one axial end and a closed end at the other axial end, and the plunger 20 has a first end inserted into the housing 10 from the open end in the axial direction. A first hydraulic chamber 11 is formed between the first end of the plunger 20 and the closed end of the housing 10, and a second hydraulic chamber 21 is formed inside the plunger 20. The first hydraulic pressure chamber 11 and the second hydraulic pressure chamber 21 may communicate through a through hole 22 on the first end of the plunger 20. The check valve 30 is installed outside the first end of the plunger 20 and is integrally located in the first hydraulic chamber 11 to selectively close the through hole 22.

As shown in fig. 2, the check valve 30 includes a valve cover 31, a check ball 32, a coil spring 33, and a ball seat 34. As shown in fig. 3, the valve cover 31 has a bottom plate 311 and a side wall 312. The side wall 312 is substantially cylindrical, and a substantially circular bottom plate 311 defines an axial end of the valve cover 31 facing away from the plunger 20. A guide hole 313 is formed through the center of the base plate 311.

As shown in fig. 4, ball seat 34 has a top receptacle portion 341 and a bottom guide portion 342. The pedestal portion 341 is formed in a bowl shape such that it is recessed in the axial direction on one side and raised in the axial direction on the opposite side. The recessed side of the receptacle portion 341 is for receiving the bottom of the check ball 32. Preferably, the concave side of the receptacle portion 341 is formed with a spherical profile so as to snugly receive the check ball 32. The receptacle portion 341 preferably has a circular peripheral contour, viewed in the axial direction, and has a flange 343 extending radially outwards. The cylindrical guide portion 342 extends in the axial direction from the middle of the convex side of the socket portion 341.

As shown in fig. 2, when the check valve 30 is installed in the hydraulic lash adjuster, the check ball 32 is located below the through-hole 22 for closing the through-hole 22. The bottom of the check ball 32 is received in a form-fitting manner in the concave side of the receptacle 341. The coil spring 33 axially abuts between the flange 343 of the holder portion 341 and the bottom plate 311 of the bonnet 31. Therefore, the coil spring 33 indirectly abuts between the check ball 32 and the bottom plate 311. The side of the flange 343 facing the base plate 311 may be a flat surface to engage the end of the coil spring 33. Alternatively, the flange 343 may be formed with an annular groove on the side facing the bottom plate 311 to receive the end of the coil spring 33. The convex side of the pedestal portion 341 will protrude into the radially inner side of the coil spring 33. The guide portion 342 extends in the axial direction on the radially inner side of the coil spring 33 and is slidably inserted into the guide hole 313. Preferably, the guide hole 313 and the guide portion 342 may be in a clearance fit, so that the guide portion 342 can smoothly slide in the guide hole 313 in the axial direction, and the hydraulic fluid can enter and exit the bonnet 31 through such a clearance. In order to facilitate the sliding of the guide part 342, the guide hole 313 and the guide part 342 preferably have corresponding cross-sectional shapes. In particular, the guide hole 313 may be a circular hole while the guide portion 342 is cylindrical and thus also has a circular cross-section.

When the liquid pressure in the second hydraulic pressure chamber 21 is small, the check ball 32 abuts against the bottom of the plunger 20 by the elastic force of the coil spring 33, thereby closing the through hole 22; when the liquid pressure in the second hydraulic pressure chamber 21 is higher than the first hydraulic pressure chamber 11 and the pressure difference is sufficiently large, this pressure difference will push the check ball 32 toward the bottom plate 311 against the elastic force of the coil spring 33. During axial movement of the check ball 32, the ball seat 34 will move axially therewith. During movement, the seat portion 341 of the ball seat 34 is stably engaged with the check ball 32 through the concave side while restraining the radial deflection of the coil spring 33 through the convex side, thereby ensuring that the check ball 32 maintains the correct positional relationship with the coil spring 33. Further, the ball seat 34 defines a positional relationship of the ball seat 34 with respect to the valve cover 31 during the movement and further defines a positional relationship of the check ball 32 and the coil spring 33 with respect to the valve cover 31 by cooperation of the guide portion 342 and the guide hole 313. Therefore, the check ball 32 and the coil spring 33 can always maintain a correct position during the operation of the check valve 30 without being easily deflected or dislocated, thereby improving the reliability of the check valve 30.

According to another embodiment of the present invention, there is also provided a hydraulic lash adjuster. The hydraulic lash adjuster includes the housing 10, the plunger 20, and the check valve 30 in the foregoing embodiment. Such a hydraulic lash adjuster thus has all the features and advantages of the check valve 30 according to the above-described embodiment.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

10 casing

11 first hydraulic chamber

20 plunger

21 second hydraulic chamber

22 through hole

30 one-way valve

31 valve cover

311 bottom plate

312 side wall

313 guide hole

32 check ball

33 helical spring

34 ball seat

341 bracket part

342 guide part

343 flange

Claims (8)

1. A check valve (30) comprising a cylindrical valve cover (31), a check ball (32), and a coil spring (33), the check ball (32) being mounted in the valve cover (31), the valve cover (31) having a bottom plate (311) at one axial end, the coil spring (33) being abutted in the axial direction between the check ball (32) and the bottom plate (311),

it is characterized in that the preparation method is characterized in that,

the check valve (30) further includes a ball seat (34), the ball seat (34) having a seating portion (341) and a guide portion (342), the bottom plate (311) having a guide hole (313), the seating portion (341) accommodating a bottom of the check ball (32) and abutting in an axial direction between the check ball (32) and the coil spring (33), the guide portion (342) extending from a side of the seating portion (341) facing away from the check ball (32) toward the bottom plate (311) on a radially inner side of the coil spring (33) and slidably inserted in the guide hole (313) in the axial direction.

2. The check valve (30) of claim 1, wherein the seat (341) has a spherical profile that is convex toward the bottom plate (311) and concave away from the check ball (32).

3. The non-return valve (30) according to claim 2, characterised in that the seat (341) has a circular peripheral profile, seen in axial direction.

4. The check valve (30) of claim 3, wherein the seat portion (341) has a flange (343) extending radially outward, the coil spring (33) abutting the flange (343).

5. The non-return valve (30) according to claim 4, characterized in that the flange (343) has a groove for accommodating an end of the helical spring (33) on the side facing the bottom plate (311).

6. The check valve (30) of any of claims 1 to 5 wherein the guide portion (342) is a clearance fit with the guide bore (313).

7. The non-return valve (30) in accordance with claim 6, characterized in that the guide portion (342) and the guide hole (313) each have a circular cross section.

8. A hydraulic lash adjuster comprising a housing (10) and a plunger (20), a first end of the plunger (20) being axially inserted into the housing (10), characterized in that the hydraulic lash adjuster further comprises a one-way valve (30) according to any one of claims 1 to 7, the one-way valve (30) being mounted externally of the first end.

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