JPS61210205A - Sealed hydraulic lash adjuster - Google Patents

Abstract

PURPOSE:To ensure the long-lasting working reliability of the captioned adjuster, which is formed by interposing a plunger in a cylindrical body with a bottom plate in a slidable manner, by ensuring the sealing performance between the body and the plunger by means of a seal ring and maintaining the shape of the seal ring by means of a reinforcing member. CONSTITUTION:In the captioned adjuster, in which a hydraulic adjuster 22 is installed at the rocking center of a rocker arm, and an inlet/outlet valves are opened/closed through the rocker arm rocking motion accompanying the rotation of a cam, a hydraulic lash adjuster 22 is constituted by interposing a plunger 25, which forms a high pressure chamber 24 between the bottom part of a cylindrical body 23 with a bottom plate and the plunger 25, in the body 23 in such a manner that the plunger 25 can freely slide. An air space 26 is formed between the inner peripheral part of the body 23 and the outer peripheral part of the plunger 25. In this air space 26 is interposed a seal ring 28, which forms a reservoir chamber 27 by closing the space between the inner peripheral surface of the body 23 and the outer peripheral surface of the plunger 25 liquid-tight and which is reinforced by a reinforcing member 32. The reservoir chamber 27 is connected to the high pressure chamber 24 via a connecting passage 29 and a check valve 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve mechanism used in a valve mechanism of a four-stroke engine, and particularly relates to a system that utilizes hydraulic pressure and fills a sealed chamber with hydraulic oil. This relates to a closed type hydraulic ratchet adjuster used in

``Prior Art'' In general, the valve mechanism of a four-stroke engine includes a plurality of structural members that are interlocked in contact with each other. The gap within the specified range is given.

By the way, there is a risk that the above-mentioned gap may exceed the allowable range due to problems over time, etc., and this may cause deviations in the opening/closing timing and lift amount of the valve, for example, and change the engine characteristics. Therefore, it is necessary to perform periodic inspections and adjustments, but due to the large number of contact parts mentioned above and the small gaps, inspection and adjustment work is difficult. is becoming more and more complicated.

Therefore, conventionally, a lash adjuster has already been proposed that automatically adjusts the above-mentioned gap to zero at all times.

FIG. 1 shows a valve train equipped with the lash adjuster.

The valve mechanism 1 is provided to open and close the intake valve 2 or exhaust valve 3 of the 4-cycle engine E, and
A cam 4 that controls the opening/closing timing of the intake valve 2 or exhaust valve 3
and a rocker arm 5 that opens and closes the intake valve 2 or the exhaust valve 3 by being swung by the cam 4, and a lash adjuster 6 is provided at the center of the swiveling of the rocker arm 5. The rocker arm 5 is swingably supported, and the position of the rocker arm 5 is adjusted to maintain the intake valve 2, the exhaust valve 3, and the cam 4 in contact with the rocker arm 5 at all times. ing.

That is, as shown in FIG. 2, the lash adjuster 6 includes a bottomed cylindrical body 7, and is slidably fitted into the body 7, with one end protruding outside the body 7. It is equipped with a plunger 8. The plunger 8 has a high pressure chamber 9 between its bottom and the bottom of the body 7.
A recess 10 is formed in the outer circumference, and a circumferential groove 12 is formed in the outer circumference to form a space 11 between the inner circumference and the inner circumference of the body 7.
is formed in the space 11, and the body 7 and the plunger 8 are airtightly attached to the space 11.
A diaphragm 14 is provided which forms a reservoir chamber 13 by dividing the body 7 into two in the length direction.

The high pressure chamber 9 and the reservoir chamber 13 are filled with hydraulic oil, and the hydraulic oil in the reservoir chamber 13 is transferred to the plunger 8.
The hydraulic oil is supplied to the high pressure chamber 9 through a communication passage 15 formed in the interior, and the hydraulic oil is prevented from flowing back into the reservoir chamber 13 by a check valve 16 provided at the end of the communication passage 15 on the high pressure chamber 9 side. is being prevented. Furthermore, a resilient member 17 is interposed in the high pressure chamber 9 to press the plunger 8 in a direction to project it from the body 7, and a rocker arm 5 is provided at the protruding end of the plunger 8 so as to be able to swing freely. A spherical bearing 18 is provided which is fitted into the spherical bearing 18 .

The rocker arm 5 and the intake valve 2 (exhaust valve 3)
) or if a gap is generated between the rocker arm 5 and the cam 4, the plunger 8, which is resiliently activated by the resilient member 17, is moved in the direction of protruding from the body 7, thereby moving the rocker arm 5 toward the intake valve 2 ( The above-mentioned gap is eliminated by contacting the exhaust valve 3) and the cam 4. As the plunger 8 moves in this manner, the volume of the reservoir chamber 13 is decreased and the volume of the high pressure chamber 9 is increased, so that the hydraulic oil in the reservoir chamber 13 flows into the high pressure chamber 9.
Further, since the hydraulic oil once flowing into the high pressure chamber 9 is prevented from flowing back by the action of the check valve 16, the plunger 8 is prevented from moving backward into the body 7. Therefore, when the pressing force from the cam 4 acts on the rocker arm 5, the swinging center of the rocker arm 5 is fixed at the position where the above-mentioned gap is eliminated, and the rocker arm 5 is moved by the cam 4.
The intake valve 2 (exhaust valve 3) can be opened and closed by swinging the intake valve 2 (exhaust valve 3).

On the other hand, when the plunger 8 is maintained in a pressed state for a long time, the hydraulic oil in the high pressure chamber 9 is gradually returned to the reservoir chamber 13 through the sliding surface between the body 7 and the plunger 8.

In this way, the gap in the valve train l is automatically adjusted to always be zero.

However, in the case of such a lash anoya star, annular grooves must be formed on the inner circumferential surface of the body 7 and the outer circumferential surface of the plunger 8 in order to attach the diaphragm 14, and the machining of these grooves is troublesome. And also,
Since the expensive diaphragm 14 is used, there is a problem in that the cost increases.

Therefore, the inventors of the present application proposed a lash adjuster according to Japanese Patent Application No. 58-204430 in an attempt to solve the above-mentioned problems.

As shown in FIG. 3, the lash annotator 19 uses a double-lip seal ring 20 in place of the diaphragm 14 described above to form the reservoir chamber 13, and the seal ring 20 is inserted into the body 7. A resilient member 21 that is in sliding contact with the peripheral surface and the outer peripheral surface of the plunger 8 in a liquid-tight state, and the seal ring 20 is interposed between the plunger 8 and the resilient member 21.
The plunger 8 is pressed toward the reservoir chamber 13 to follow the change in volume of the reservoir chamber 13 as the plunger 8 moves.

By adopting such a configuration, an expensive diaphragm is not required, cost is reduced, and machining of the body 7 and plunger 8 is reduced, thereby solving the above-mentioned problems.

"Problems to be Solved by the Invention" The present invention aims to improve the following problems remaining in the lash adjuster proposed by the inventors of the present invention.

That is, since the seal ring needs to ensure close contact with the body and plunger to prevent oil leakage from the reservoir chamber, an elastic material that can generate a predetermined close contact force is used. If there is variation in the friction between the seal ring and the body or plunger in the circumferential direction of the seal ring, the seal ring will move in the longitudinal direction of the lash adjuster as shown in Figure 4 when the plunger moves. This may cause damage to the fluid tightness of the reservoir chamber or damage to the seal ring. It is necessary to improve the reliability of the adjuster.

"Means for Solving the Problems" The present application seeks to provide three inventions related to a lash adjuster that effectively embodies the measures for the above-mentioned improvements, and the first invention is particularly aimed at A seal ring is fitted between the circumferential surface and the outer circumferential surface of the plunger, and the seal ring is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger to form a liquid-tight chamber by closing the space between the two in a liquid-tight state. characterized by comprising an elastic member slidingly in contact with the elastic member, and a reinforcing member integrally provided with the elastic member,
In addition, a second invention provides a sealing ring that is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger to form a reservoir chamber by sealing the gap between the two in a liquid-tight state. A step portion perpendicular to the sliding direction of the plunger is formed in a portion forming a reservoir chamber, and the nollinog is connected to an elastic member slidingly in contact with the inner circumferential surface of the body and the outer circumferential surface of the plano gloss, and the elastic portion 10. and a reinforcing member integrally provided, and further includes a leg portion that abuts the stepped portion.Furthermore, the third invention is characterized in that the structure includes a reinforcing member that is integrally provided, and a leg portion that comes into contact with the step portion. A seal ring is fitted into the tank to form a reservoir chamber by sealing the space between the two in a liquid-tight manner.
The seal ring is constituted by an elastic member that slides in contact with the inner circumferential surface of the body and the outer circumferential surface of the plunger, and a reinforcing member that is integrally provided on one end surface in the thickness direction of the elastic member, and the seal ring A set of reinforcing members are provided along the length of the body so that the reinforcing members face each other.

"Function" The first invention of the present application has the above-described configuration, so that the sealing property between the body and the plunger is ensured by the seal ring, and the shape of the seal ring is maintained by the reinforcing member to change the posture with respect to the body and the plunger. This is to prevent

In addition to the effect of the first invention, the second invention also provides that, by bringing the legs into contact with the stepped portion of the body, the moving position of the seal ring is regulated and the elastic member is always kept in the circular shape of the body or the plunger. It is meant to make contact with the part. Furthermore, in addition to the effects of the first invention, the third invention forms a space between the two seal rings to accommodate leaked oil from the reservoir chamber.

"Example" Hereinafter, the first invention of the present application will be described based on an example shown in FIGS. 5 and 6.

In FIGS. 5 and 6, the reference numeral 22 indicates a lash adjuster according to the present embodiment, and the lash adjuster 22 is placed inside a bottomed cylindrical body 23 and between the bottom of the body 23 and the lash adjuster 22. A plunger 25 forming a high pressure chamber 24 is slidably fitted, and the outer peripheral part of the plunger 25 and the body 2
A space 26 is formed between the inner circumferential surface of the body 23 and the outer circumferential surface of the plunger 25, and a space 26 is formed between the inner circumferential surface of the body 23 and the outer circumferential surface of the plunger 25. A communication passage 2 is fitted in the plunger 25 to communicate the reservoir chamber 27 and the high pressure chamber 24, and a seal ring 28 is fitted therein to form a reservoir chamber 27 by sealing the gap in a fluid-tight manner.
9, and a check valve 30 is provided in the communication passage 29 to allow the hydraulic oil stored in the reservoir chamber 27 to flow only into the high pressure chamber 24, and the seal ring 28 is connected to the body. 23 inner peripheral surface and plunger 2
an elastic member 31 slidingly in contact with the outer peripheral surface of the elastic member 31;
The reinforcing member 32 is integrally provided with the reinforcing member 32.

Next, to explain these details, a cover plate 33 is integrally attached to the open end of the body 23, and the plunger 25 is passed through the body 23 so as to be able to reciprocate in the length direction. It is designed to cover between the plunger 25 and the opening edge of the body 23.

The plunger 25 is fitted into the body 23 with one end protruding to the outside of the body 23, and the vicinity of the one end has a small diameter, so that the outer peripheral surface and the opening of the body 23 are close to each other. The space portion 26 is formed between the inner peripheral surface and the adjacent inner circumferential surface. A recess 34 is formed at the other end to form the high pressure chamber 24, and a plunger 25 is inserted into the body 25 inside the recess 34.
Coil spring 35 that springs to protrude from 3
is interposed.

The communication passage 29 includes a filling passage 29a that passes through the plunger 25 in the length direction, a main passage 29b that communicates the filling passage 29a with the reservoir chamber 27, and a main passage 29b that connects the filling passage 29a with the body 23 and the plunger 25. A plug body 36 is fitted into the filling passage 29a to liquid-tightly close the filling passage 29a.

The elastic member 31 constituting the seal ring 28 is made of an oil-resistant rubber material and is molded into a double lip shape with an X-shaped cross section. The reinforcing member 32, which is another component, is formed into a T-shaped cross section by cutting out a metal part, and is integrated into one end surface in the thickness direction of the elastic member 31 by press-fitting or bonding. is installed.

Furthermore, a stop ring S is integrally attached to the inside of the body 23 in a state in which the stop ring S is located in front of the plunger 25 in the sliding direction and is partially exposed in the reservoir chamber 27. It engages with the edge of the large diameter portion of the body 25 to restrict its movement in the direction of protruding from the body 23.

However, the lash adjuster 19 of this embodiment configured in this way is attached to the swinging center of the rocker arm 5 that constitutes the valve mechanism l, for example, similar to the conventional lash adjuster 6 shown in FIG. Then, the position of the rocker arm 5 is automatically adjusted so that the gap between the rocker arm 5 and the intake valve 2 (exhaust valve 3) or the cam 4 is always zero.

That is, if the above-mentioned gap does not occur, the pressing force on the plunger 25 is weakened, and the elastic force of the coil spring 35 pushes the plunger 25 in the direction of protruding from the body 23. As a result, the rocker arm 5 is moved toward the intake valve 2 (exhaust valve 3) and the cam 4, and the gap is eliminated.

On the other hand, with the movement of the plunger 25, the volume of the high pressure chamber 24 (as shown in the drawing) is expanded, but as a result, the hydraulic oil in the reservoir chamber 27 is
and flows into the high pressure chamber 24 via the check valve 30. The flow of the hydraulic oil is similarly stopped when the plunger 25 stops moving and the gap becomes zero (see FIG. 6). Then, cam 4 is attached to plunger 25.
When the pressure from made with the state. Therefore, the rocking center of the rocker arm 5 is fixed at the position where the above-mentioned gap is 0, and the rocker arm 5
When a pressing force is applied by the hecam 4, the rocker arm 5 is swung by the pressing force, and the intake valve 2 (exhaust valve 3) is opened and closed.

When the pressing force continues to act on the plunger 25 for a long time, the hydraulic oil in the high pressure chamber 24 gradually leaks out from between the sliding surfaces of the body 23 and the plunger 25, causing the sub- It is returned to the reservoir chamber 27 through the passage 29c.

Due to this action, the intake valve 2 (exhaust valve 3) can be opened and closed with the gap between each component of the valve mechanism 1 always being zero.

Then, when adjusting the gap described above, the body 23
Since the space between the cylinder and the plunger 25 is liquid-tightly closed by the elastic member 31 of the seal ring 28, leakage of hydraulic oil from the reservoir chamber 27 is suppressed.

Further, as the plunger 25 moves, the seal ring 28 is also moved along the moving direction of the plunger 75.
Since the elastic member 31 has a rigid structure due to the reinforcing member 32, deformation such as twisting can be suppressed even if the friction between the body 23 and the plunger 25 is uneven. Therefore, damage to the seal ring 28 can be prevented and stable operation can be maintained over a long period of time.

Next, the second invention will be explained based on an embodiment shown in FIGS. 7 and 8. In the following description, the same reference numerals are used for parts common to the first invention to simplify the description.

Reference numeral 37 in FIGS. 7 and 8 indicates a lash adjuster according to this embodiment.

The lash adjuster 37 is arranged between the inner circumferential surface of a bottomed cylindrical body 38 and the plunger 25 slidably fitted into the body 38, by closing the space between the two in a liquid-tight manner to form a reservoir chamber. A seal ring 39 forming the reservoir chamber 27 is fitted thereinto, a stepped portion 38a orthogonal to the sliding direction of the plunger 25 is formed in a portion of the body 38 forming the reservoir chamber 27, and the seal ring 39 is inserted into the body 38. The leg portion 40a is composed of an elastic member 40 that slides on the outer circumferential surface and the outer circumferential surface of the plunger 25, and a reinforcing member 32 that is integrally provided with the elastic member 40.
1.

Next, in detail, the stepped portion 38a of the body 38 is formed by increasing the inner diameter of the body 38 from the middle portion in the longitudinal direction to the open end.

In this embodiment, the leg portion 40a is formed integrally with the elastic member 40, and is formed in an annular shape like the elastic member 40. Further, the length of the leg portion 40a, that is, the length along the sliding direction of the plunger 25 is the length of the step portion 3.
8a, the main passage 2 formed in the inner peripheral part of the elastic member 40 and the plunger 25
The length is set to prevent overlap with 9b.

With this configuration, similarly to the first invention, the plunger 25 is moved to automatically adjust the OH of the gaps between the constituent members of the valve mechanism I.

Then, during the adjustment operation described above, the action of the reinforcing member 32 allows the elastic member 40 to follow the change in volume of the reservoir chamber 27 while preventing deformation such as twisting. Further, when the plunger 25 is in the most protruded state from the body 38, the leg portion 40a is attached to the stepped portion 38 of the body 38.
The elastic member 40 of the seal ring 39 and the plunger 2
This prevents the elastic member 40 from overlapping with the main passage 29b of the plunger 25, so that the inner peripheral surface of the elastic member 40 is brought into contact only with the circular portion of the plunger 25, and a stable sealing effect can be obtained. Further, the elastic member 40 will not be damaged due to getting caught on the opening edge of the main passage 29 or the like.

Further, by providing the leg portions 40a, the strength of the central portion of the elastic member 40 is increased, and the synergistic effect with the reinforcing member 32 can further enhance the effect of preventing deformation of the seal ring 39.

FIG. 9 shows an embodiment of the third invention, and the reference numeral 4 in the figure shows an embodiment of the third invention.
1 is a lash adjuster according to this embodiment.

The lash adjuster 41 is the reservoir chamber 2 of the lash adjuster 37 according to the second invention described above.
In addition to the seal ring 39 fitted within the seal ring 7, another seal ring 42 is fitted, and the other structures are the same as in the second invention.

Both seal rings 39.42 are attached to the plunger 2 such that their respective reinforcing members 32.43 face each other.
5, and forms a leakage space 44 therebetween.

With this configuration, when the plunger 25 moves in the backward direction and the volume of the reservoir chamber 27 expands, the leaked hydraulic oil is temporarily stored in the leak space 44, and the plunger 25 protrudes. When the volume inside the reservoir chamber 27 decreases by moving in the direction, the leakage space 4
By returning the hydraulic oil in the reservoir chamber 27 to the reservoir chamber 27, air is prevented from being sucked into the reservoir chamber 27 when the volume decreases as described above.

It should be noted that the various shapes and dimensions of the constituent members shown in each of the embodiments of the first to third aspects of the invention are merely examples, and can be variously changed based on design requirements and the like. For example, the reinforcing member 32
The cross-sectional shape of the plate is not limited to a T-shape by cutting, but can also be made into a similar shape by pressing, or may be an L-shape. It is also possible to provide a protruding tongue piece and bite the tongue piece into the elastic member 31 (40) to integrate it.

"Effects of the Invention" As explained above, the lash adjuster according to each invention of the present application provides the following excellent effects.

According to the first invention, a seal ring is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger, and the seal ring is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger to form a reservoir chamber by liquid-tightly closing the space between the two. Since it is composed of an elastic member that slides on the inner circumferential surface and the outer circumferential surface of the plunger, and a reinforcing member that is integrally provided to the elastic member, the seal ring can be moved to follow the change in volume of the reservoir chamber. , allows the plunger to move smoothly, and increases the rigidity of the seal ring with a reinforcing member to prevent deformation and tilting of the seal ring due to movement, thereby suppressing breakage of the seal ring and making it stable. Operation can be maintained for a long period of time.

According to the second invention, a seal ring is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger to seal the space between the two in a liquid-tight state to form a reservoir chamber, and the reservoir chamber of the body is closed. an elastic member having a stepped portion perpendicular to the sliding direction of the plunger, the seal ring slidingly contacting the inner circumferential surface of the body and the outer circumferential surface of the plunger; and reinforcement provided integrally with the elastic member. In addition to the effect of the first invention, since the leg portion is provided which abuts the step portion, the leg portion abuts the step portion when the plunger is most protruded from the body. By restraining the movement of the seal ring, the elastic member of the seal ring and the opening edge of the communication passage formed in the plunger are prevented from overlapping, and thereby the inner circumferential surface of the elastic member is pressed against the circular portion of the plunger. By contacting only the elastic member, damage to the elastic member can be prevented and a stable sealing effect can be obtained.

Further, by providing the leg portions, the elastic member is reinforced, and the synergistic effect with the reinforcing member can further enhance the effect of preventing deformation of the seal ring.

According to the third invention, a seal ring is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger, and the seal ring is fitted between the inner circumferential surface of the body and the outer circumferential surface of the plunger to form a reservoir chamber by closing the space between the two in a liquid-tight state. It is composed of an elastic member that slides on the inner circumferential surface and the outer circumferential surface of the plunger, and a reinforcing member that is integrally provided on one end surface in the thickness direction of the elastic member. Since the members are installed along the length of the body so that they face each other, the leaked hydraulic oil is temporarily stored between both seal rings when the plunger moves backward into the body and the volume of the reservoir chamber expands. In addition, when the plunger moves in the protruding direction and the volume in the reservoir chamber decreases, the hydraulic oil between both seal rings is returned to the reservoir chamber, so that even if hydraulic oil leaks, the above-mentioned To prevent air from being sucked into a reservoir chamber when the volume is reduced, thereby ensuring secure operation of fixing a rocker arm by a plunger.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a vertical cross-sectional view of a main part of an engine having a valve mechanism to which a conventional lash adjuster is applied, and FIG. 2 is a vertical cross-sectional view showing an example of the structure of a conventional lash adjuster.
3 and 4 show the lash adjuster proposed by the inventors of the present invention, in which FIG. 3 is a longitudinal sectional view, and FIG.
The figure is a schematic diagram showing the operation of the seal ring, Figures 5 and 6 are longitudinal sectional views showing an embodiment of the first invention, and Figures 7 and 8 are longitudinal sectional views showing an embodiment of the second invention. The top view and FIG. 9 are longitudinal sectional views showing an embodiment of the third invention. 1... Valve train mechanism, 2... Intake valve, 3... Exhaust valve, 4... Cam, 5... Rocker arm, 22 (37・41) ... Lash adjuster, 23 (3g) ... Body, 24 ... High pressure chamber, 25 ... Plunger, 26 ... ... Space part, 27 ... Reservoir chamber, 2g (39.42) ... Seal ring, 29.
...Communication passage, 30...Check valve, 31 (40)...Elastic member, 32 (43)...Reinforcement member, 35... ... Coil spring, 38a ... Step portion, 40a ... Leg portion, 44 ... Leak space. Figure 2 Figure 3 1/Pu 11:1 Figure 4 Figure 6

Claims (3)

[Claims] (1) A plunger that forms a high pressure chamber between the bottom of the body and the bottom of the body is slidably fitted into a cylindrical body with a bottom, and between the outer circumference of the plunger and the inner circumference of the body. A space is formed that is separated from the high-pressure chamber in a liquid-tight manner, and a reservoir chamber is formed within the space by sealing the space between the inner peripheral surface of the body and the outer peripheral surface of the plunger in a liquid-tight state. A check valve fitted with a seal ring to form a communication passage in the plunger that communicates the reservoir chamber and the high pressure chamber, and to allow the hydraulic oil stored in the reservoir chamber to flow into the communication passage only into the high pressure chamber. and the seal ring is comprised of an elastic member that slides into contact with the inner circumferential surface of the body and the outer circumferential surface of the plunger, and a reinforcing member that is integrally provided with the elastic member. Sealed hydraulic lash adjuster. (2) A plunger that forms a high pressure chamber between the bottom of the body and the bottom of the body is slidably fitted into a cylindrical body with a bottom, and between the outer circumference of the plunger and the inner circumference of the body. A space is formed that is separated from the high-pressure chamber in a liquid-tight manner, and a reservoir chamber is formed within the space by sealing the space between the inner peripheral surface of the body and the outer peripheral surface of the plunger in a liquid-tight state. A check valve fitted with a seal ring to form a communication passage in the plunger that communicates the reservoir chamber and the high pressure chamber, and to allow the hydraulic oil stored in the reservoir chamber to flow into the communication passage only into the high pressure chamber. and a stepped portion perpendicular to the sliding direction of the plunger is formed in a portion of the body forming the reservoir chamber, and the seal ring is slidable on the inner circumferential surface of the body and the outer circumferential surface of the plunger. 1. A sealed hydraulic lash adjuster comprising an elastic member in contact with the elastic member and a reinforcing member integrally provided with the elastic member, and further comprising a leg portion in contact with the stepped portion. (3) A plunger that forms a high pressure chamber between the bottom of the body and the bottom of the body is slidably fitted into the bottomed cylindrical body, and between the outer circumference of the plunger and the inner circumference of the body. A space is formed that is separated from the high-pressure chamber in a liquid-tight manner, and a reservoir chamber is formed within the space by sealing the space between the inner peripheral surface of the body and the outer peripheral surface of the plunger in a liquid-tight state. A check valve fitted with a seal ring to form a communication passage in the plunger that communicates the reservoir chamber and the high pressure chamber, and to allow the hydraulic oil stored in the reservoir chamber to flow into the communication passage only into the high pressure chamber. comprising an elastic member that brings the seal ring into sliding contact with the inner circumferential surface of the body and the outer circumferential surface of the plunger, and a reinforcing member integrally provided on one end surface in the thickness direction of the elastic member. What is claimed is: 1. A sealed hydraulic lash adjuster, characterized in that the set of seal rings is provided along the length of the body so that the respective reinforcing members face each other.