CN218563723U - Hydraulic lash adjuster - Google Patents

Abstract

The utility model relates to a hydraulic pressure lash adjuster for engine valve mechanism. The hydraulic lash adjuster includes: an upper plunger, a cylindrical shell and a lower plunger; wherein the upper plunger has a closed first end, an open second end, and a hollow upper plunger inner cavity, and the housing has a third end open toward the upper plunger, a closed fourth end facing away from the upper plunger, and a hollow housing inner cavity; the plunger piston comprises a shell, an upper plunger piston and a lower plunger piston, wherein an annular first oil groove is formed between the inner side wall of the shell and the outer peripheral surface of the upper plunger piston, an annular second oil groove is formed between the inner side wall of the shell and the outer peripheral surface of the lower plunger piston, and a first oil inlet hole communicated with the first oil groove and the inner cavity of the upper plunger piston is formed in the side wall of the upper plunger piston. The utility model discloses a hydraulic pressure lash adjuster simple structure, it is with low costs to resistance when the plunger return is little, has guaranteed hydraulic pressure lash adjuster's normal work.

Description

Hydraulic lash adjuster

Technical Field

The utility model relates to an engine technical field. Specifically, the utility model relates to a hydraulic pressure lash adjuster for engine valve mechanism.

Background

In an 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 typically oscillates about a hydraulic lash adjuster, driven by the cam, which automatically adjusts the lash between the cam and the rocker arm through telescopic movement of its plunger within the housing.

With the hydraulic lash adjusters of current design, during operation, oil flows from the low pressure chamber to the high pressure chamber. When the cam rotates, the hydraulic lash adjuster is pressed, and the oil in the high-pressure chamber flows upward through the clearances between the housing and the lower plunger, and between the housing and the upper plunger. Part of engine oil flows back to the low-pressure chamber through the groove of the lower plunger and the oil inlet hole communicated with the gap, and the rest of engine oil flows out of the shell. This design requires an external oil pump and oil passages for continuous oil supply, which results in a complicated cylinder head design. Furthermore, in order to avoid oil leakage, a sealing ring is required to be added between the housing and the upper plunger. However, after the cam lift, the hydraulic lash adjuster needs to compensate for the valve lash, and the upper plunger needs to return upward. The seal will now provide resistance to the upper plunger. If the engine speed is very high and the resistance is too large, the upper plunger cannot return in time, so that faults are caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a hydraulic pressure lash adjuster for valve mechanism.

The embodiment of the utility model provides a hydraulic pressure lash adjuster includes: an upper plunger, a cylindrical shell and a lower plunger. Wherein the upper plunger has a closed first end, an open second end, and a hollow upper plunger inner cavity, and the housing has a third end open toward the upper plunger, a closed fourth end facing away from the upper plunger, and a hollow housing inner cavity. The lower plunger is arranged in the shell inner cavity of the shell, the second end part of the upper plunger extends into the shell inner cavity through the opening of the third end part of the shell, the first end part of the upper plunger is arranged outside the shell, and the lower plunger is positioned between the upper plunger and the shell. The plunger piston comprises a shell, an upper plunger piston and a lower plunger piston, wherein an annular first oil groove is formed between the inner side wall of the shell and the outer peripheral surface of the upper plunger piston, an annular second oil groove is formed between the inner side wall of the shell and the outer peripheral surface of the lower plunger piston, and a first oil inlet hole communicated with the first oil groove and the inner cavity of the upper plunger piston is formed in the side wall of the upper plunger piston.

According to some embodiments of the invention, the first oil groove is configured as: when the upper plunger is compressed downwards, the projection of the first oil inlet hole and the first oil groove in the radial direction is at least partially overlapped, and when the upper plunger returns upwards to the return position, the projection of the first oil inlet hole and the first oil groove in the radial direction is not overlapped.

According to some embodiments of the present invention, the lower plunger has an open lower plunger inner cavity facing an axial end of the upper plunger, the upper plunger inner cavity and the lower plunger inner cavity enclosing a low pressure chamber; and one axial end of the lower plunger piston, which is far away from the upper plunger piston, and the part, which is close to the fourth end, of the inner cavity of the upper plunger piston surround to form a high-pressure chamber.

According to some embodiments of the present invention, the lower plunger has a communicating groove that communicates with the outer peripheral surface of the lower plunger and the low pressure chamber toward the axial end of the upper plunger.

According to some embodiments of the utility model, the lower plunger has a plurality of intercommunication grooves, the intercommunication groove is in along circumference evenly distributed the lower plunger towards the axial one end of last plunger.

According to the utility model discloses a some embodiments, the second oil groove sets up to: when the upper plunger pushes the lower plunger to compress downwards and when the upper plunger returns upwards to the return position, the communicating groove is communicated with the second oil groove.

According to some embodiments of the invention, the third end of the housing and the upper plunger are provided with an annular sealing sleeve therebetween.

According to the utility model discloses a some embodiments, the fixed setting of axial one end of seal cover is in on the shell, the other end of seal cover is fixed to be set up on the upper plunger, the seal cover has the folded portion of multilayer echelonment along axial direction, the folded portion is followed the motion of upper plunger is tensile or folding.

According to some embodiments of the invention, the sealing sleeve, the upper plunger and the housing enclose a sealing sleeve chamber; the upper plunger is provided with a second oil inlet hole, and the second oil inlet hole is communicated with the seal sleeve cavity and the inner cavity of the upper plunger.

According to some embodiments of the invention, the sealing sleeve is made of an elastic material.

The utility model provides an among the hydraulic lash adjuster, need not outside oil pump and oil duct and come continuous fuel feeding, simple structure, low in manufacturing cost. Moreover, by arranging two-stage engine oil backflow structures (a first oil groove and a first oil inlet hole, and a second oil groove and a communicating groove) between the lower plunger and the shell and between the upper plunger and the shell, even three-stage engine oil backflow structures (a seal sleeve cavity and a second oil inlet hole), the sealing performance is ensured under the condition that no sealing ring is used; and the resistance between the shell and the upper plunger caused by the sealing ring is greatly reduced, so that the resistance when the upper plunger returns is small, and the normal work of the hydraulic clearance adjuster is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a cross-sectional view of a hydraulic lash adjuster in an up-set condition according to an embodiment of the present disclosure;

fig. 2 shows a cross-sectional view of a hydraulic lash adjuster in a downward compression state in accordance with an embodiment of the present disclosure;

fig. 3 shows a partial schematic view of a hydraulic lash adjuster in a downward compression state in accordance with an embodiment of the present disclosure;

FIG. 4 shows an enlarged schematic view of portion A of FIG. 1;

FIG. 5 shows an enlarged schematic view of portion B of FIG. 2;

fig. 6 shows a perspective view of a lower plunger according to an embodiment of the present invention;

fig. 7 shows a cross-sectional view of a hydraulic lash adjuster in an up-set condition according to another embodiment of the present disclosure.

It will be appreciated that the above figures are merely schematic and that the figures are not drawn to scale in practice.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the present invention, belong to the protection scope of the present invention.

According to the utility model discloses an embodiment provides a hydraulic pressure lash adjuster, this hydraulic pressure lash adjuster is arranged in the engine valve mechanism.

Fig. 1 shows a cross-sectional view of a hydraulic lash adjuster in an up-set condition according to an embodiment of the present disclosure; fig. 2 shows a cross-sectional view of a hydraulic lash adjuster in a downward compression state according to an embodiment of the present disclosure. Referring to fig. 1-2, the hydraulic lash adjuster includes an upper plunger 1, a cylindrical housing 2, and a lower plunger 3. Wherein the upper plunger 1 has a closed first end 11, an open second end 12 and a hollow upper plunger bore 13. The housing 2 has a third end 21 which is open towards the upper plunger 1, a closed fourth end 22 which faces away from the upper plunger 1, and a hollow housing interior.

Specifically, the inner diameter of the housing 2 is larger than the outer diameter of the upper plunger 1 and the outer diameter of the lower plunger 3. The lower plunger 3 is arranged in the housing inner cavity of the housing 2. The second end 12 of the upper plunger 1 protrudes into the housing interior through the opening of the third end 21 of the housing 2, and the first end 11 of the upper plunger 1 is disposed outside the housing 2. The lower plunger 3 is located between the upper plunger 1 and the housing 2.

Further, one end of the lower plunger 3 facing the upper plunger 1 in the axial direction is provided with an open lower plunger inner cavity 32, and the upper plunger inner cavity 13 and the lower plunger inner cavity 32 surround to form a low-pressure chamber; one end of the lower plunger 3, which is far away from the upper plunger 1 in the axial direction, and the part of the inner cavity 13 of the upper plunger, which is close to the fourth end 22, surround to form a high-pressure chamber.

The lower plunger 3 may be further provided with a communication hole 33 communicating the low pressure chamber and the high pressure chamber. The hydraulic lash adjuster further includes a check valve 4, the check valve 4 being provided at the communication hole 33 to make oil circulate from the low pressure chamber to the high pressure chamber in one direction. Furthermore, a spring 5 is arranged between an axial end face of the lower plunger 3 facing the fourth end 22 and a bottom face of the housing interior, and the spring 5 damps the relative movement between the lower plunger 3 and the housing 2.

In operation, the upper plunger 1 and the lower plunger 3 can move in the axial direction along the inner cavity of the housing 2. When the upper plunger 1 is compressed downwards, the second end part 12 of the upper plunger 1 is contacted with the axial end surface of the upper plunger 3 facing the upper plunger 1, and pushes the lower plunger 3 to move downwards, the spring 5 is compressed, and the oil pressure in the high-pressure chamber is increased; when the upper plunger 1 returns upwards, the spring 5 rebounds the lower plunger 3 and the upper plunger 1 upwards.

Fig. 3 shows a partial schematic view of a hydraulic lash adjuster in a downward compression state in accordance with an embodiment of the present disclosure. Referring to fig. 1 to 3, an annular first oil groove 6 is formed between the inner side wall of the housing 2 and the outer circumferential surface of the upper plunger 1, an annular second oil groove 7 is formed between the inner side wall of the housing 2 and the outer circumferential surface of the lower plunger 3, and a first oil inlet 14 communicating the first oil groove 6 with an inner cavity 13 of the upper plunger 1 is formed in the side wall of the upper plunger 1. Further, one end of the lower plunger 3 in the axial direction facing the upper plunger 1 has a communication groove 31 for communicating the outer peripheral surface of the lower plunger with the low-pressure chamber.

Specifically, when the upper plunger 1 is compressed downward, the oil pressure in the high-pressure chamber increases, and the oil in the high-pressure chamber enters under pressure into the gap between the lower plunger 3 and the housing 2 and first enters the second oil groove 7, at which time, part of the oil enters the low-pressure chamber through the communication groove 31, and the oil pressure in the high-pressure chamber is partially released; the oil in the second oil groove 7 further enters under pressure into the gap between the upper plunger 1 and the housing 2 and then into the first oil groove 6, at which time part of the oil in the first oil groove 6 enters the low pressure chamber through the first oil inlet hole 14. According to the hydraulic lash adjuster, the engine oil in the high-pressure cavity flows back to the low-pressure cavity through the two oil grooves twice, the engine oil entering the gap between the shell 2 and the lower plunger 3 or the upper plunger 1 can effectively reduce oil leakage, and no sealing ring is additionally arranged, so that the increase of resistance between the upper plunger 1 and the shell 2 caused by the sealing ring can be avoided, the resistance when the upper plunger 1 returns is small, and the normal work of the hydraulic lash adjuster is ensured.

Further, referring to fig. 1 to 3, the first oil groove 6 may be configured as: when the upper plunger 1 is compressed downward, the first oil inlet hole 14 at least partially coincides with a projection of the first oil groove 6 in the radial direction, and when the upper plunger 1 is returned upward to the return position, the first oil inlet hole 14 does not coincide with a projection of the first oil groove 6 in the radial direction. Thus, when the upper plunger 1 compresses downward, the engine oil entering the first oil groove 6 can smoothly enter the low-pressure chamber, and when the upper plunger 1 returns upward to the return position, the engine oil in the low-pressure chamber can be effectively reduced to enter the first oil groove 6 through the first oil inlet 14.

Fig. 4 shows an enlarged schematic view of a portion a in fig. 1, that is, an enlarged schematic view of the second oil groove 7 in the upward returning state of the hydraulic lash adjuster; fig. 5 shows an enlarged schematic view of a portion B in fig. 2, that is, an enlarged schematic view of the second oil groove 7 in a downward compression state of the hydraulic lash adjuster. As shown in fig. 1 to 5, the second oil groove 7 may be configured as: when the upper plunger 1 pushes the lower plunger 3 to compress downwards and when the upper plunger 1 returns upwards to a return position, the communication groove 31 is communicated with the second oil groove 7, so that the engine oil in the second oil groove 7 can flow back to the low-pressure chamber through the communication groove 31 at any time. In this way, when the oil pressure of the second oil groove 7 increases, the communication groove 31 does not communicate with the second oil groove 7, and thus the second oil groove is prevented from entering the first oil groove 6 preferentially through the gap between the upper plunger 1 and the housing 2.

Fig. 6 shows a perspective view of the lower plunger 3 according to an embodiment of the invention. In some alternative embodiments, the lower plunger has a plurality of communication grooves 31 evenly distributed in the circumferential direction at an axial end of the lower plunger 3 facing the upper plunger 1.

Fig. 7 shows a cross-sectional view of a hydraulic lash adjuster in an up-set condition according to another embodiment of the present disclosure. As shown in fig. 7, an annular sealing sleeve 8 is provided between the third end 21 of the housing 2 and the upper plunger 1.

Specifically, one axial end of the sealing sleeve 8 is fixedly arranged on the housing 2, and the other end of the sealing sleeve 8 is fixedly arranged on the upper plunger 1. The sealing sleeve is provided with a multi-layer step-shaped folding part 81 along the axial direction, and the folding part 81 is stretched or folded along with the movement of the upper plunger 1. Wherein, the sealing sleeve 8 can be made of elastic material, such as rubber material. By providing the seal sleeve 8 between the housing 2 and the upper plunger 1, a small amount of engine oil flowing out from the gap between the upper plunger 1 and the housing 2 above the first oil groove 6 can be sealed. By the design of the multi-step fold 81, the resistance between the upper plunger 1 and the housing 2 is small.

In some alternative embodiments, the sealing boot 8, the upper plunger 1, and the housing 2 enclose a boot chamber 82. The upper plunger 1 has a second oil inlet hole 15, and the second oil inlet hole 15 communicates the seal sleeve chamber 82 and the upper plunger inner chamber 13. When the upper plunger 1 compresses downward, part of the engine oil in the high-pressure chamber firstly enters the second oil groove 7 through the gap between the shell 2 and the lower plunger 3, and part of the engine oil flows back to the low-pressure chamber through the communication groove 31, and part of the oil pressure is released; subsequently, a part of the oil enters the first oil groove 6 through a gap between the upper plunger 1 and the housing 2, and a part of the oil returns to the low pressure chamber through the first oil inlet hole 14, at which time the oil pressure is further released; then, a very small amount of engine oil enters the seal housing chamber 82 through the gap between the upper plunger 1 and the housing 2 above the first oil groove 6 and flows back to the low pressure chamber through the second oil inlet hole 15, thus ensuring that the engine oil does not leak.

The utility model provides an among the hydraulic lash adjuster, need not outside oil pump and oil duct and come the continuous fuel feeding, simple structure, low in manufacturing cost. Moreover, by arranging two-stage oil backflow structures (the first oil groove 6 and the first oil inlet hole 14, and the second oil groove 7 and the communicating groove 31) between the lower plunger 3 and the shell 2 and between the upper plunger 1 and the shell 2, even three-stage oil backflow structures (the seal sleeve cavity 82 and the second oil inlet hole 15), the sealing performance is ensured without using a sealing ring; and the resistance between the shell and the upper plunger caused by the sealing ring is greatly reduced, so that the resistance is small when the upper plunger returns, and the normal work of the hydraulic lash adjuster is ensured.

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

1. An upper plunger; 11. a first end portion; 12. a second end portion; 13. an inner cavity of the upper plunger; 14. a first oil inlet hole;

15. a second oil inlet hole;

2. a housing; 21. a third end portion; 22. a fourth end portion;

3. a lower plunger; 31. a communicating groove; 32. the inner cavity of the lower plunger; 33. a communicating hole;

4. a one-way valve;

5. spring

6. A first oil groove;

7. a second oil groove;

8. a sealing sleeve; 81. a folding part; 82. a sealed gland chamber.

Claims (10)

1. A hydraulic lash adjuster, characterized in that,

comprises an upper plunger (1), a cylindrical shell (2) and a lower plunger (3);

wherein the upper plunger (1) has a closed first end (11), an open second end (12) and a hollow upper plunger inner cavity (13), the housing (2) has a third end (21) open towards the upper plunger (1), a closed fourth end (22) facing away from the upper plunger (1) and a hollow housing inner cavity;

the lower plunger (3) is arranged in a shell inner cavity of the shell (2), the second end part (12) of the upper plunger (1) extends into the shell inner cavity through an opening of the third end part (21) of the shell (2), the first end part (11) of the upper plunger (1) is arranged outside the shell (2), and the lower plunger (3) is positioned between the upper plunger (1) and the shell (2);

the utility model discloses a plunger piston, including the inside wall of shell (2) with annular first oil groove (6) have between the outer peripheral face of last plunger piston (1), the inside wall of shell (2) with annular second oil groove (7) have between the outer peripheral face of lower plunger piston (3), the lateral wall of going up plunger piston (1) has the intercommunication first oil inlet (14) of first oil groove (6) and last plunger piston inner chamber (13), lower plunger piston (3) have a plurality ofly with intercommunication groove (31) of second oil groove (7) intercommunication.

2. The hydraulic lash adjuster according to claim 1,

the first oil groove (6) is arranged as follows: when the upper plunger (1) is compressed downwards, the first oil inlet hole (14) and the projection of the first oil groove (6) in the radial direction at least partially coincide, and when the upper plunger (1) returns upwards to the return position, the projection of the first oil inlet hole (14) and the first oil groove (6) in the radial direction do not coincide.

3. A hydraulic lash adjuster according to claim 1, characterized in that the lower plunger (3) has an open lower plunger inner chamber (32) at an axial end facing the upper plunger (1), the upper plunger inner chamber (13) and the lower plunger inner chamber (32) enclosing a low pressure chamber; and one axial end of the lower plunger (3) far away from the upper plunger (1) and the part, close to the fourth end part (22), of the inner cavity (13) of the upper plunger are encircled to form a high-pressure chamber.

4. A hydraulic lash adjuster according to claim 3, characterized in that an axial end of the lower plunger (3) facing the upper plunger (1) has a communication groove (31) communicating the lower plunger outer peripheral surface with the low pressure chamber.

5. A hydraulic lash adjuster according to claim 4, characterized in that the communication grooves (31) are evenly distributed in the circumferential direction at an axial end of the lower plunger (3) facing the upper plunger (1).

6. The hydraulic lash adjuster according to claim 4,

the second oil groove (7) is provided with: when the upper plunger (1) pushes the lower plunger (3) to compress downwards and when the upper plunger (1) returns upwards to a return position, the communication groove (31) is communicated with the second oil groove (7).

7. A hydraulic lash adjuster according to claim 1, characterized in that an annular sealing sleeve (8) is provided between the third end (21) of the housing (2) and the upper plunger (1).

8. A hydraulic lash adjuster according to claim 7, characterized in that one axial end of the sealing sleeve (8) is fixedly arranged on the housing (2) and the other end of the sealing sleeve (8) is fixedly arranged on the upper plunger (1), the sealing sleeve having a multi-step fold (81) in the axial direction, the fold (81) being stretched or folded with the movement of the upper plunger (1).

9. A hydraulic lash adjuster according to claim 8, characterized in that the sealing sleeve (8), the upper plunger (1) and the housing (2) enclose a sealing sleeve chamber (82);

the upper plunger (1) is provided with a second oil inlet hole (15), and the second oil inlet hole (15) is communicated with the seal sleeve cavity (82) and the inner cavity (13) of the upper plunger.

10. A hydraulic lash adjuster according to claim 7, characterized in that the sealing sleeve (8) is made of an elastic material.

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