CN116412012A - Hydraulic lash adjuster and valve mechanism - Google Patents

Abstract

The present disclosure relates to a hydraulic lash adjuster and a valve train. Wherein the hydraulic lash adjuster includes: the shell comprises an opening end and a fluid supplementing end along the axial direction; the inner cavity of the plunger forms a low-pressure chamber, the plunger is sleeved in the shell from the opening end of the shell and forms a high-pressure chamber with the fluid supplementing end of the shell, and the plunger can reciprocate relative to the shell along the axial direction; wherein, the outer wall of casing is followed the axial interval is equipped with: the first convex ring is provided with a first channel which is penetrated along the axial direction; the second convex ring is provided with a second channel which is penetrated along the axial direction; and the first liquid storage cavity, the first convex ring, the second convex ring and the outer wall of the shell form an annular first liquid storage cavity, the first liquid storage cavity is communicated with the outer environment through the first channel, and the first liquid storage cavity is communicated with the high-pressure chamber through the second channel. The oil storage space can be increased by the housing of the present disclosure.

Description

Hydraulic lash adjuster and valve mechanism

Technical Field

The invention relates to the technical field of engine accessories, in particular to a hydraulic clearance adjuster and a valve mechanism.

Background

In an internal combustion engine of a motor vehicle, a rocker arm is generally provided that controls valve opening and closing by pushing a valve stem. The roller of the rocker arm is driven by the cam to reciprocate by taking the hydraulic lash adjuster as a supporting point, and the hydraulic lash adjuster is a structural element for automatically adjusting the clearance between the cam and the rocker arm and between the rocker arm and the valve through the telescopic movement of the plunger thereof in the shell 10.

A typical hydraulic lash adjuster 100 configuration (shown in fig. 1) includes a housing 10, a plunger 20, a check valve 30, and a return spring 40. In such a typical configuration, a low pressure chamber a for storing oil is formed in the inner cavity of the plunger 20, a high pressure chamber B for storing oil is formed between the bottom of the plunger 20 and the bottom of the housing 10, the low pressure chamber a and the high pressure chamber B are communicated with each other through a check valve 30, and the check valve 30 allows oil to flow from the low pressure chamber a into the high pressure chamber B.

Oil supply holes 11 are formed in both the side walls of the housing 10 and the plunger 20, and hydraulic oil in the engine cylinder head environment can be supplied to the low pressure chamber of the plunger 20 through the oil supply holes 11. When the valve mechanism works, the rocker arm 200 presses the plunger 20 under the action of the cam, and part of oil in the high-pressure chamber B leaks through a gap between the shell 10 and the plunger 20 due to pressure difference between the high-pressure chamber B and the oil supply hole 11. During the cam base circle phase, the plunger 20 top pressure is less than the high pressure chamber hydraulic pressure and the return spring force, the high pressure chamber B expands, the check valve 30 opens, and the leaked oil is replenished into the high pressure chamber B from the low pressure chamber a.

However, this structure has a problem that the oil leakage of the high pressure chamber B is large, and the oil needs to be continuously replenished from the low pressure chamber a, so that the low pressure chamber a needs to be continuously replenished from the cylinder head environment and a sufficient oil storage space is maintained, and for this reason, a separate oil pump and an additional oil supply channel need to be provided in the cylinder head, which results in high cost and complex structure.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a hydraulic lash adjuster and a valve train.

According to a first aspect of embodiments of the present disclosure, the present disclosure provides a hydraulic lash adjuster comprising: the shell comprises an opening end and a fluid supplementing end along the axial direction; the inner cavity of the plunger forms a low-pressure chamber, the plunger is sleeved in the shell from the opening end of the shell and forms a high-pressure chamber with the fluid supplementing end of the shell, and the plunger can reciprocate relative to the shell along the axial direction; wherein, the outer wall of casing is followed the axial interval is equipped with: the first convex ring is provided with a first channel which is penetrated along the axial direction; the second convex ring is provided with a second channel which is penetrated along the axial direction; and the first liquid storage cavity, the first convex ring, the second convex ring and the outer wall of the shell form an annular first liquid storage cavity, the first liquid storage cavity is communicated with the outer environment through the first channel, and the first liquid storage cavity is communicated with the high-pressure chamber through the second channel.

In some embodiments, a first through hole is formed in a side wall of the housing, and the first through hole is located in the first liquid storage cavity.

In some embodiments, the plunger is provided with a second through-hole that is axially therethrough, the second through-hole communicating the low pressure chamber with an external environment; the side wall of the plunger is provided with a third through hole which is penetrated in the radial direction, and the third through hole is communicated with the first through hole, so that a second liquid storage cavity extending from the second through hole to the third through hole is formed in the low-pressure chamber.

In some embodiments, the hydraulic lash adjuster further comprises: the check valve comprises a check ball and a valve seat, the fluid supplementing end of the shell is provided with an axially through fluid supplementing hole, the check ball is abutted to the fluid supplementing hole, the valve seat wraps the check ball towards the plunger, and a valve wing extends along the radial direction and is attached to the fluid supplementing end of the shell; and one end of the return spring is abutted against the valve wing of the valve seat, and the other end of the return spring is abutted against the plunger and used for supporting the valve wing and the check ball so as to open or close the fluid supplementing hole.

In some embodiments, the plunger is provided with a communication hole that is axially therethrough; the hydraulic lash adjuster further comprises a blocking cover, the blocking cover is located in the high-pressure chamber, the other end of the return spring is abutted to the blocking cover to enable the blocking cover to be abutted to the plunger and cover the communication hole, the blocking cover is provided with an exhaust hole which penetrates through axially, and the exhaust hole and the communication hole are not overlapped in the radial direction.

In some embodiments, the blocking cover is provided with an arch structure corresponding to the position of the communication hole, the arch structure protrudes towards one side of the high-pressure chamber and forms an arc wall, and the arch structure is sunken towards one side of the communication hole to form an arc groove.

In some embodiments, the exhaust holes are provided in plurality and are uniformly arranged in the circumferential direction.

In some embodiments, the first collar is disposed at the open end of the housing; and/or the second convex ring is arranged at the fluid supplementing end of the shell.

In some embodiments, the first channels are provided in plurality and equally spaced circumferentially; and/or the second channels are provided in plurality and are equally spaced along the circumferential direction.

According to a second aspect of embodiments of the present disclosure, the present disclosure provides a valve train comprising: the hydraulic lash adjuster of the first aspect; the rocker arm comprises a supporting end, and the supporting end is in abutting connection with the plunger.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the first channel of the first bulge loop of casing outer wall, the second channel and the first stock solution chamber of second bulge loop are convenient for collect the fluid in the environment of cylinder head, under the condition that need not extra oil pump and oil duct, increase oil storage space, guarantee can in time provide sufficient fluid to the high-pressure chamber, can avoid high-pressure chamber fluid to inhale the air, cause the reduction of high-pressure chamber interior fluid rigidity, simple structure and with low costs.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is an axial cross-sectional view of a related art hydraulic lash adjuster;

FIG. 2 is a schematic volume view of a reservoir of a related art hydraulic lash adjuster;

FIG. 3 is a schematic illustration of a hydraulic lash adjuster within a cylinder head, according to an example embodiment;

FIG. 4 is a schematic structural view of a housing shown according to an exemplary embodiment;

FIG. 5 is a schematic volume view of a first fluid reservoir, according to an example embodiment;

FIG. 6 is a schematic structural view of a plunger in accordance with an example embodiment;

FIG. 7 is a schematic volume view of a second reservoir, according to an example embodiment;

FIG. 8 is a schematic volumetric view of the remaining oil storage chamber shown according to an exemplary embodiment;

FIG. 9 is an enlarged view of a portion of FIG. 3;

FIG. 10 is a schematic perspective view of a shield cover;

FIG. 11 is a schematic illustration of the injection of oil into the high pressure chamber at the factory;

FIG. 12 is a schematic diagram illustrating a hydraulic lash adjuster in combination with a rocker arm, according to an example embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

In order to avoid leakage of oil and to avoid high cost and complex structure caused by continuous oil supply, in one of the related arts, the oil supply hole 11 of the housing 10 and the plunger 20 is eliminated, the low pressure chamber a and the high pressure chamber B are filled with oil when leaving the factory, and the sealing ring 50 is disposed in the gap between the housing 10 and the upper end of the plunger 20 to avoid leakage of oil.

However, since the plunger 20 needs to reciprocate in the housing 10, the seal ring 50 tends to generate a larger resistance to the movement of the plunger 20, so when the engine speed is too fast and the resistance of the seal ring 50 is too large, the hydraulic force and the return spring force of the high-pressure chamber B cannot support the plunger 20 to reset in time, which not only cannot compensate the gap between the structures of the valve mechanism in time, resulting in failure of the hydraulic lash adjuster 100, but also the oil in the low-pressure chamber a cannot be supplemented to the high-pressure chamber B in time, which may cause that the oil in the high-pressure chamber B is very easy to suck air from the surrounding environment, the oil sucked into the air is easy to be spongy after long-time working, is easy to be compressed and has reduced rigidity, and is unfavorable for the working of the hydraulic lash adjuster 100.

In addition, due to the presence of the oil supply hole 11 of the housing 10, as shown in fig. 2, the oil storage space of the hydraulic lash adjuster 100 in the related art cannot fill the entire inner cavity of the plunger 20, resulting in waste of the oil storage space and insufficient oil storage.

In another related art, in order to increase the volume of the oil storage space, an oil collecting housing is sleeved outside the housing 10, however, the radial dimension of the entire hydraulic lash adjuster 100 is larger than the existing radial dimension after the oil collecting housing is sleeved, which is not beneficial to the pursuit of compact structure of the present hybrid engine.

To solve the above-mentioned technical problem, the present disclosure provides a hydraulic lash adjuster 100, as shown in fig. 3, the hydraulic lash adjuster 100 including: the housing 10, the plunger 20, the check valve 30, and the return spring 40.

Wherein, in the present disclosure, unless otherwise specified, the axial direction Y, the radial direction X, and the circumferential direction W refer to the axial direction Y, the radial direction X, and the circumferential direction W, respectively, of the hydraulic lash adjuster 100; the axial direction Y refers to the vertical direction shown in fig. 1, 3, 11, and 12, and the radial direction X refers to the lateral direction shown in fig. 1, 3, 11, and 12; the circumferential direction W refers to the circumferential direction of fig. 4 and 10.

Specifically, the housing 10 has a cylindrical sleeve shape and includes an open end 12 and a fluid-supplementing end 13 along an axial direction Y, and the fluid-supplementing end 13 is provided with a fluid-supplementing hole 131 penetrating through the axial direction Y, that is, both ends of the housing 10 have openings penetrating through the axial direction Y.

The plunger 20 includes a first end 21 and a second end 22 along the axial direction Y, the second end 22 of the plunger 20 is sleeved inside the housing 10 from the open end 12 of the housing 10, the inner cavity of the plunger 20 forms a low pressure chamber a, the second end 22 of the plunger 20 forms a high pressure chamber B with the closed end of the housing 10, and the high pressure chamber B communicates with the fluid-filling hole 131, so that the high pressure chamber B communicates with the space of the outer wall of the housing 10 through the fluid-filling hole 131.

The check valve 30 and the return spring 40 are disposed in the high-pressure chamber B, the check valve 30 includes a check ball 31 and a valve seat 32, the check ball 31 abuts against the fluid-replenishing hole 131, the valve seat 32 wraps the check ball 31 toward the plunger 20, and a valve wing 321 extends in the radial direction X, and the valve wing 321 is attached to the fluid-replenishing end 13 of the housing 10. One end of the return spring 40 abuts against the valve wing 321 of the valve seat 32, and the other end abuts against the plunger 20, for supporting the valve wing 321 and the check ball 31 to open or close the fluid-supplementing hole 131, so as to allow the oil of the outer wall of the casing 10 to flow into the high pressure chamber B.

At the same time, the plunger 20 is also under the action of the return spring 40, the plunger 20 being able to reciprocate inside the housing 10 in the axial direction Y with respect to the housing 10 to compensate for the tolerance gap of the whole valve train.

Further, as shown in fig. 4, the outer wall of the housing 10 is provided with a first convex ring 14 and a second convex ring 15 at intervals along the axial direction Y, and the first convex ring 14, the second convex ring 15 and the outer wall of the housing 10 form a first annular liquid storage cavity 16.

The first bulge loop 14 and the second bulge loop 15 are both protruded from the outer wall of the casing 10, and the first bulge loop 14 and the second bulge loop 15 are protruded from the outer wall of the casing 10 in the radial direction X to have the same height, when the first bulge loop 14 and the second bulge loop 15 are both abutted against the inner wall of the cylinder head 300, the inner wall of the cylinder head 300 seals the first liquid storage cavity 16 formed by the first bulge loop 14, the second bulge loop 15 and the outer wall of the casing 10, so that the first liquid storage cavity 16 is in a circular ring column shape (as shown in fig. 5), and can store oil.

In the disclosed embodiment, the first collar 14 is provided with one and is disposed at the open end 12 of the housing 10; and/or the second convex ring 15 is provided with one and is arranged at the fluid supplementing end 13 of the shell 10.

Further, the first collar 14 is provided with a first passage 141 penetrating in the axial direction Y, and the second collar 15 is provided with a second passage 151 penetrating in the axial direction Y; the first reservoir 16 communicates with the external environment of the cylinder head 300 through the first passage 141, and the first reservoir 16 communicates with the high-pressure chamber B through the second passage 151.

Thus, the oil in the surrounding environment of the cylinder head 300 flows into the first liquid storage cavity 16 in a converging manner through the first channel 141, after the oil in the first liquid storage cavity 16 is filled, the oil in the high pressure chamber B can be supplemented into the high pressure chamber B through the second channel 151, in a working state, after the oil in the high pressure chamber B is extruded and leaked, the first liquid storage cavity 16 can increase the oil storage space without an additional oil pump and under the condition that an oil duct is arranged on the cylinder head 300, so that the oil in the high pressure chamber B can be timely supplemented, the oil in the high pressure chamber B can be prevented from being inhaled into the air, meanwhile, the circulation of the oil in the high pressure chamber B can be promoted, the fresh bubble-free oil can be always introduced into the high pressure chamber B, the aging of the oil in the high pressure chamber B can be avoided, the reduction of the rigidity of the oil in the high pressure chamber B can be avoided, and the hydraulic lash adjuster 100 can be disabled.

Wherein the first passages 141 are provided in plurality and are equally spaced along the circumferential direction W of the first convex ring 14; and/or the second passages 151 are provided in plurality and equally spaced along the circumferential direction W of the second collar 15. In other embodiments, the first channel 141 and the second channel 151 may be respectively provided as one channel, or the plurality of first channels 141 and the second channel 151 may be arranged at unequal intervals along the circumferential direction W, which falls within the protection scope of the present disclosure.

The first and second passages 141 and 151 may be cylindrical holes in the axial direction Y, or holes in the outer walls of the first and second collars 14 and 15, respectively (as shown in fig. 4), and the number of the first and second passages 141 and 151 may be the same or different, and the first and second passages 141 and 151 may correspond to each other in the axial direction Y, or may be offset in the axial direction Y, and are not particularly limited herein.

It should be noted that, in other embodiments, one or more first convex rings 14 may be provided, and one or more second convex rings 15 may be provided, that is, a plurality of annular first liquid storage cavities 16 may be formed between the first convex rings 14 and the second convex rings 15. The first convex rings 14 and the second convex rings 15 may be arranged at equal intervals or non-equal intervals.

In other embodiments, the first convex ring 14 may be perpendicular to the axial direction Y, or may be inclined or spiral to the axial direction Y, which is not limited herein.

In some embodiments, the side wall of the housing 10 is provided with a first through hole 17 penetrating radially X, the first through hole 17 being located in the first reservoir 16.

Specifically, during the base circle phase, the valve closes, the check valve 30 opens under oil pressure in the environment surrounding the cylinder head 300, the return spring 40 compresses, and the oil in the first reservoir 16 fills the high pressure chamber B.

When the valve is opened, the pressure from the cam presses the plunger 20 into the housing 10, the return spring 40 compresses, the check valve 30 closes and the pressure in the high pressure chamber B rises, the oil in the high pressure chamber B presses leakage from the leakage gap between the housing 10 and the piston, a part of the leaked oil flows back into the first reservoir 16 through the first through hole 17, and a small amount of the oil leaks out of the housing 10.

At the end of the valve lift, the applied axial Y pressure at the first end 21 of the plunger 20 becomes less than the hydraulic force acting on the plunger 20 and the return spring 40 force. Accordingly, the high pressure chamber B expands, the check valve 30 opens and the oil leaked from the high pressure chamber B is refilled by the first reservoir 16 through the second passage 151 and the fluid supplementing hole 131.

So, the first through hole 17 not only can reduce the oil pressure of the oil in the leakage gap, but also can timely recover the leaked oil, avoid the transitional leakage of the oil in the high-pressure chamber B, and slow down the reduction speed of the oil in the high-pressure chamber B.

Further, as shown in fig. 6, the first end 21 of the plunger 20 is provided with a second through hole 211 penetrating in the axial direction Y, and the second through hole 211 communicates the low pressure chamber a with the external environment of the cylinder head 300; the side wall of the plunger 20 is provided with a third through hole penetrating in the radial direction X, which communicates with the first through hole 17, so that a second liquid storage chamber (as shown in fig. 7) extending from the second through hole 211 to the third through hole is formed in the low pressure chamber a.

Specifically, the oil in the external environment around the cylinder head 300 enters the low-pressure chamber a of the plunger 20 through the second through hole 211, and after the low-pressure chamber a is filled with the oil, the oil in the low-pressure chamber a flows into the first liquid storage cavity 16 through the third through hole 23 of the wall of the plunger 20 and the first through hole 17 of the housing 10.

It is understood that the first fluid storage chamber 16 of the outer wall of the housing 10 communicates with the outside environment of the cylinder head 300 through the first passage 141 of the first collar 14, and at the same time, the first fluid storage chamber 16 also communicates with the outside environment of the cylinder head 300 through the first through hole 17 of the housing 10, the third through hole 23 of the plunger 20 and the second through hole 211, and thus, the second fluid storage chamber 24 extending from the second through hole 211 to the third through hole 23 may be formed in the low pressure chamber a.

Both the second fluid storage chamber 24 and the first fluid storage chamber 16 can collect the airless fluid in the external environment of the cylinder head 300 and store the fluid, and the fluid storage space of the present disclosure is significantly increased compared to the volume of the fluid storage space in the related art (as shown in fig. 2). Meanwhile, under the action of the external oil pressure, the first liquid storage cavity 16 and the second liquid storage cavity 24 can both supplement oil to the high-pressure chamber B, so that the sufficiency of the oil in the first liquid storage cavity 16 and the timely supplement of the oil in the high-pressure chamber B are ensured, and the phenomenon that the rigidity of the oil in the high-pressure chamber B is reduced due to the fact that air is sucked into the high-pressure chamber B is avoided.

In addition, the volume of the remaining oil storage chambers is shown in fig. 8, and includes the liquid storage chamber between the first through hole 17 and the third through hole 23, the liquid storage chamber of the second channel 151, the liquid storage formed between the liquid supplementing end 13 of the housing 10 and the cylinder head 300, and the liquid storage formed between the liquid supplementing hole 131 and the cylinder head 300, respectively.

In summary, the first convex ring 14, the second convex ring 15 of the housing 10, the first liquid storage cavity 1616 formed by the outer wall of the housing 10 and the inner wall of the cylinder head 300, the second liquid storage cavity 24 formed by the inner cavity of the plunger 20, and other liquid storage cavities jointly increase the oil storage space of the whole hydraulic lash adjuster 100, and the combination of the above structures jointly ensures that the oil volume is sufficient when the oil is replenished into the high-pressure chamber B by taking the first channel 141 of the first convex ring 14 and the second through hole 211 of the plunger 20 as the fluid replenishing channels.

In some embodiments, as shown in fig. 9, the second end 22 of the plunger 20 is provided with a communication hole 221 penetrating in the axial direction Y, the communication hole 221 allowing communication of the low pressure chamber a with the high pressure chamber B. The hydraulic lash adjuster 100 further includes a stopper cover 50, the stopper cover 50 being located in the high-pressure chamber B, the other end of the return spring 40 abutting against the stopper cover 50 to hold the stopper cover 50 in abutment with the second end 22 of the plunger 20 and covering the communication hole 221.

The barrier cover 50 is movable in the axial direction Y by the return spring 40 to open or close the communication hole 221, so that the high pressure chamber B and the low pressure chamber a are selectively communicated or blocked through the communication hole 221.

As shown in fig. 10, the cover 50 is provided with an exhaust hole 51 penetrating in the axial direction Y, the exhaust hole 51 and the communication hole 221 do not overlap in the radial direction X, and the exhaust hole 51 and the communication hole 221 do not overlap in the radial direction X, so that air bubbles of the oil in the high-pressure chamber B can be discharged without causing a decrease in the rigidity of the oil due to a cotton-like oil in the high-pressure chamber B while the high-pressure of the oil is maintained (i.e., the rigidity of the hydraulic lash adjuster 100 is maintained).

In some embodiments, the exhaust holes 51 are provided in plurality and are uniformly arranged in the axial direction W. The plurality of exhaust holes 51 uniformly arranged may allow the air in the high pressure chamber B to be more uniformly diffused into the low pressure chamber a. Of course, the number and arrangement of the exhaust holes 51 may be designed according to actual requirements, and are not specifically described herein.

In some embodiments, the blocking cover 50 is provided with an arch structure 52 at a position corresponding to the communication hole 221, the arch structure 52 protrudes toward one side of the high pressure chamber B and forms an arc wall 521, and the arch structure 52 is recessed toward one side of the communication hole 221 to form an arc groove 522.

The air vent hole 51 is located at the edge of the arch structure 52 and protrudes toward the arc wall 521 of one side of the high pressure chamber B, so as to avoid air bubbles from collecting in the high pressure chamber B, and guide the air bubbles to move toward the air vent hole 51, so as to facilitate better air bubble discharge.

Further, when leaving the factory, it is often necessary to pre-pour oil into the high pressure chamber B, as shown in fig. 11, one oil injection pipe 60 is inserted into the low pressure chamber a through the second through hole 211 of the plunger 20, and is abutted to the arc-shaped groove 522 of the blocking cover 50 through the communication hole 221, the blocking cover 50 is pressed by the axial direction Y to compress the return spring 40, the blocking cover 50 opens the communication hole 221, and oil is injected into the high pressure chamber B, so that the pre-pouring of oil in the high pressure chamber B is completed.

At this time, the blocking cover 50 can pre-pour the oil into the high pressure chamber B from the direction shown in fig. 11, and the oil does not need to be pre-poured into the high pressure chamber B through the fluid supplementing hole 131, so that the process flow and the device of the inverted hydraulic lash adjuster 100 do not need to be increased, the current production process equipment is adapted, the cost is saved, and the process of pre-pouring the oil is simple, convenient and easy to operate.

The arc-shaped groove 522 plays a role in positioning and guiding, so that the oil injection pipeline 60 can be quickly abutted on the baffle cover 50 and is not easy to separate, and the filling of oil is facilitated.

Based on the same inventive concept, the present disclosure also provides a valve train, as shown in fig. 12, which shows a partial structure of the valve train (valve stem, spring, valve structure, etc. are not shown), which may include the hydraulic lash adjuster 100 and the rocker arm 200.

In the related art center, an engine has a cylinder head 300 and a cylinder (not shown), the cylinder head 300 is used for sealing the cylinder, a through tappet hole is provided in the cylinder head 300, a push rod (which may also be called a valve stem) is provided in the tappet hole, the engine is further provided with a cam shaft (not shown), the cam shaft is provided with a cam, the cam shaft drives the cam to rotate, and the cam drives the push rod to reciprocate in the tappet hole through driving the roller 70 of the rocker arm 200, so that an intake valve and an exhaust valve of the engine are opened and closed at regular time, combustible gas is supplied to the cylinder, and exhaust gas is timely discharged, thereby meeting the intake and exhaust demands of the engine.

The hydraulic lash adjuster 100 is that when the valve train works, the return spring 40, the first liquid storage cavity 16, the second liquid storage cavity 24 of the low pressure chamber a and the hydraulic pressure in the high pressure chamber B push the plunger 20 to abut against the supporting end of the rocker arm 200 to eliminate the clearance between the valve train components, thereby ensuring that the cam can always abut against the roller 70, realizing the opening and closing of the valve, and avoiding failure.

Further, as shown in fig. 12, the rocker arm 200 includes a support end 80, the support end 80 is provided with an oil collecting hole 81, wherein the position of the oil collecting hole 81 corresponds to a second through hole 211 at the first end 21 of the plunger 20, and the oil collecting hole 81 is communicated with the low pressure chamber a through the second through hole 211, so that the low pressure chamber a is communicated with the external environment of the cylinder head 300, oil in the surrounding environment of the cylinder head 300 can be collected, fresh oil can be replenished, and oil circulation can also avoid oil aging, and air in the oil can be timely discharged, so that the rigidity of the oil in the high pressure chamber B is increased.

The specific manner in which the function of the hydraulic lash adjuster 100 in the valve train in the above embodiment is achieved has been described in detail in the embodiment relating to the hydraulic lash adjuster 100, and will not be explained in detail here.

It is understood that the term "plurality" in this disclosure means two or more, and other adjectives are similar thereto. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish one type of structure from another and do not indicate a particular order or importance. Indeed, the expressions "first", "second", etc. may be used entirely interchangeably. For example, a first structure may also be referred to as a second structure, and similarly, a second structure may also be referred to as a first structure, without departing from the scope of the present disclosure.

It will be further understood that the terms "center," "longitudinal," "transverse," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience in describing the present embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation.

It will be further understood that "connected" includes both direct connection where no other member is present and indirect connection where other element is present, unless specifically stated otherwise.

It will be further understood that although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims (10)

1. A hydraulic lash adjuster (100), characterized by comprising:

the shell (10) comprises an opening end (12) and a fluid supplementing end (13) along the axial direction (Y);

a plunger (20), the inner cavity of the plunger (20) forming a low pressure chamber (a), the plunger (20) being nested in the housing (10) from the open end (12) of the housing (10) and forming a high pressure chamber (B) with the fluid-filled end (13) of the housing (10), the plunger (20) being reciprocally movable in an axial direction (Y) relative to the housing (10);

wherein, the outer wall of the shell (10) is provided with:

a first convex ring (14), wherein the first convex ring (14) is provided with a first channel (141) penetrating along the axial direction (Y);

a second convex ring (15), wherein the second convex ring (15) is provided with a second channel (151) penetrating along the axial direction (Y); and

the first liquid storage cavity (16), first bulge loop (14), second bulge loop (15) with the outer wall of casing (10) forms annular first liquid storage cavity (16), first liquid storage cavity (16) are through first passageway (141) and external environment intercommunication, first liquid storage cavity (16) are through second passageway (151) with high-pressure chamber (B) intercommunication.

2. The hydraulic lash adjuster (100) according to claim 1, characterized in that,

the side wall of the shell (10) is provided with a first through hole (17) penetrating in the radial direction (X), and the first through hole (17) is positioned in the first liquid storage cavity (16).

3. The hydraulic lash adjuster (100) according to claim 2, characterized in that,

the plunger (20) is provided with a second through hole (211) penetrating in the axial direction (Y), and the second through hole (211) enables the low-pressure chamber (A) to be communicated with the external environment;

the side wall of the plunger (20) is provided with a third through hole (23) penetrating through the radial direction (X), and the third through hole (23) is communicated with the first through hole (17) so that a second liquid storage cavity (24) extending from the second through hole (211) to the third through hole (23) is formed in the low-pressure chamber (A).

4. The hydraulic lash adjuster (100) according to claim 1, further comprising:

the check valve (30) comprises a check ball (31) and a valve seat (32), wherein the fluid supplementing end (13) of the shell (10) is provided with a fluid supplementing hole (131) penetrated in the axial direction (Y), the check ball (31) is abutted to the fluid supplementing hole (131), the check ball (31) is wrapped by the valve seat (32) towards the plunger (20), a valve wing (321) extends along the radial direction (X), and the valve wing (321) is attached to the fluid supplementing end (13) of the shell (10);

and one end of the return spring (40) is abutted against the valve wing (321) of the valve seat (32), and the other end of the return spring is abutted against the plunger (20) and used for supporting the valve wing (321) and the check ball (31) so as to open or close the fluid supplementing hole (131).

5. The hydraulic lash adjuster (100) according to claim 4, characterized in that,

the plunger (20) is provided with a communication hole (221) penetrating in the axial direction (Y);

the hydraulic lash adjuster (100) further includes a stopper cover (50), the stopper cover (50) is located in the high-pressure chamber (B), the other end of the return spring (40) abuts against the stopper cover (50) to keep the stopper cover (50) in abutment with the plunger (20) and cover the communication hole (221),

wherein the shield cover (50) is provided with an exhaust hole (51) penetrating in the axial direction (Y), and the exhaust hole (51) and the communication hole (221) do not overlap in the radial direction (X).

6. The hydraulic lash adjuster (100) according to claim 5, characterized in that,

the baffle cover (50) is provided with an arch structure (52) at a position corresponding to the communication hole (221), the arch structure (52) protrudes towards one side of the high-pressure chamber (B) and forms an arc wall (521), and the arch structure (52) is sunken towards one side of the communication hole (221) to form an arc groove (522).

7. The hydraulic lash adjuster (100) according to claim 5, characterized in that,

the exhaust holes (51) are provided in plurality and are uniformly arranged in the circumferential direction (W).

8. The hydraulic lash adjuster (100) according to claim 1, characterized in that,

the first convex ring (14) is arranged at the opening end (12) (13) of the shell (10); and/or

The second convex ring (15) is arranged at the fluid supplementing end (13) (12) of the shell (10).

9. The hydraulic lash adjuster (100) according to claim 1, characterized in that,

the first channels (141) are provided in plurality and are equally spaced in the circumferential direction (W); and/or

The second passages (151) are provided in plurality and are arranged at equal intervals in the circumferential direction (W).

10. A valve train, comprising:

the hydraulic lash adjuster (100) according to any one of claims 1 to 9; and

a rocker arm (200), the rocker arm (200) comprising a support end (80), the support end (80) being in abutment with the plunger (20) of the hydraulic lash adjuster (100).

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