JPH06173622A - Hydraulic rush adjuster and manufacture thereof - Google Patents

Abstract

PURPOSE:To realize stable operation by preventing oil in a reservoir chamber of a rush adjuster used in a valve moving mechanism of an internal combustion engine from leaking outside when operation is stopped over a long period of time. CONSTITUTION:A plunger part 3 and a plunger cap part 2 are formed of the same material as a seamless continuous single piece member. Thereby, clearance communicated with the outside is eliminated between members around a reservoir chamber 5, so that oil in the reservoir chamber can be prevented from leaking outside when operation is stopped over a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic lash adjuster. More specifically, the present invention relates to a hydraulic lash adjuster in which a plunger portion and a plunger cap portion are formed as a single continuous structure mainly as a measure against oil spill. Hereinafter, a hydraulic lash adjuster (hereinafter, "hydraulic type" is abbreviated in the present specification, simply referred to as "lash adjuster").
The general operation of (referred to as) will be described. In general internal combustion engines, it is necessary to provide a valve clearance in consideration of the difference between the expansion of the cylinder head and the expansion of the valve operating mechanism due to heat, but if this valve clearance is not appropriate, noise will be generated during engine operation. Or a loss of horsepower may occur due to blown raw gas. A lash adjuster is known as a means for solving such a problem. The lash adjuster always keeps the valve clearance at almost zero during operation of the valve mechanism, absorbs changes in expansion due to temperature, prevents noise and blowout of raw gas, and realizes stable operation of the valve mechanism. It is a thing.

In a valve mechanism, a cam shaft is arranged in a cylinder head and an OHC type for driving an intake / exhaust valve directly or without a swing arm and a cam shaft are provided in a cylinder block, and a push rod and a swing arm are provided. There is an OHV type that drives an intake / exhaust valve via the. Whether the OHC type or the OHV type, when the engine is operating, the lash adjuster and the intake / exhaust valve function integrally according to the rotation of the cam. When the engine is stopped, the cam abuts the cam surface at an arbitrary position on the upper surface of the lash adjuster directly or indirectly via the swing arm. Therefore, when the cam nose (protruding part of the cam surface) directly or indirectly contacts the upper surface of the lash adjuster, the urging force of the valve spring that urges the intake / exhaust valve to the closed position is relatively large. A pressure force mainly in the axial direction is constantly applied to the entire adjuster. Therefore, if this stopped state continues for a long time, the oil in the high pressure chamber gradually leaks from the gap between the main body of the lash adjuster and the plunger, and finally the high pressure chamber is in the most crushed state, that is, the volume of the high pressure chamber is the smallest. It becomes a state (so-called "bottoming out state").

Thereafter, when the engine is restarted, the volume of the high pressure chamber of the lash adjuster stopped at this cam nose position increases, the high pressure chamber becomes negative pressure, the check ball opens, and oil is sucked from the reservoir to the high pressure chamber. . When the pressure in the high-pressure chamber reaches a predetermined pressure (pressure during normal operation) again, the check valve closes. In this state, the lash adjuster will perform a normal expansion / contraction operation. Acting in this manner, the lash adjuster automatically adjusts to properly fill any gaps and properly seat the valve. As a result, noise generation can be eliminated. However, when the cam nose starts, air is suddenly sucked into the high pressure chamber from the reservoir chamber immediately after the start via the oil passage in the cylinder head, etc., and the high pressure chamber does not maintain rigidity, so-called "sponge state", and the cam It may not follow the displacement and may generate an abnormal noise. Further, when the engine is operating at a high speed, oil containing a large amount of air is easily sucked into the high pressure chamber. Therefore,
It is important to prevent the intake of air into the high pressure chamber. Therefore, in order to prevent oil containing much air from entering the high pressure chamber through the reservoir chamber, a separator is fitted to the plunger cap.

[0004]

In the conventional lash adjuster having the above-mentioned function, for example, when the lash adjuster is mounted on the cylinder head, it becomes bottomed when the cam nose is stopped, and the amount of oil in the high pressure chamber is reduced. It is the smallest. In addition, the oil in the reservoir chamber gradually leaks to the outside through the contact surface between the plunger and the plunger cap, that is, the axial mating surface and the sliding surface between the plunger cap and the main body. Further, oil in the reservoir chamber leaks from between the plunger cap and the separator fitted into it, so if the lash adjuster is left stopped for a long time, the oil will escape to the outside of the lash adjuster through the oil inlet. . In this way, the oil level in the reservoir chamber of the lash adjuster may be considerably lowered during a long stoppage. As a result, when restarting the engine after a long stop, even if a separator is provided, air is likely to enter the reservoir chamber, especially in the high pressure chamber of the lash adjuster that starts from the bottomed state. Air may enter easily, and abnormal noise may occur.

When the cam nose starts after the oil has flowed out from the lash adjuster to the outside as described above, air is rapidly sucked from the reservoir chamber to the high pressure chamber immediately after the start via the oil passage in the cylinder head. It is considered that the high-pressure chamber is in a so-called “sponge state” in which rigidity cannot be maintained, it cannot follow the displacement of the cam, an abnormal noise is generated, and the function of adjusting the valve clearance is also affected. In order to solve the above-mentioned problem, for example, in Japanese Utility Model Laid-Open No. 2-14403, a plunger, a plunger cap, and a separator, which are separately configured, are joined by welding at positions where three members come into contact with each other. It is disclosed to prevent oil from leaking between the members.

However, even if such a structure is effective in preventing oil from leaking from the reservoir chamber, the plunger and the plunger cap are required as separate members, and those members including the separator are required. There was a problem that the work of welding the entire circumference was necessary. As described above, the conventional lash adjuster has poor workability as a countermeasure against oil spills and has many steps, which makes it difficult to reduce costs. From the above, the object of the present invention is to solve the above-mentioned problems of the conventional lash adjuster, to be manufactured with a simpler structure and at a lower cost than the conventional one, and to provide a reservoir for the lash adjuster during a long stoppage or the like. By preventing the oil in the room from leaking out from the body of the lash adjuster through the oil inlet, the oil level in the reservoir room is kept as high as possible, especially when restarting from the cam nose. It is an object of the present invention to provide a lash adjuster capable of preventing intake of air into the lash adjuster, particularly, the high pressure chamber and suppressing generation of abnormal noise.

[0007]

In order to achieve the above-mentioned object, the hydraulic lash adjuster of the present invention is held in a cylinder head so that the rotational displacement of a cam can be transferred to an intake / exhaust valve without producing a valve clearance. A hydraulic lash adjuster for transmitting, a cup-shaped main body having an oil introduction port for introducing oil from the outside, a plunger portion axially slidably fitted in the main body, and an upper portion of the plunger portion. A plunger cap portion that is axially slidably fitted in the main body, and a separator that divides a space defined between the plunger portion and the plunger cap portion into two spaces that communicate with each other. , And the plunger portion and the plunger cap portion are formed of the same material as a continuous and seamless single-piece construction. That.

A method of manufacturing a hydraulic lash adjuster according to the present invention is a hydraulic lash adjuster which is held in a cylinder head and transmits a rotational displacement of a cam to an intake / exhaust valve without producing a valve clearance. A plunger portion which is slidably fitted in a cup-shaped main body having an oil introduction port for introducing oil from the outside,
Two plunger caps, which are arranged above the plungers and are fitted in the main body so as to be slidable in the axial direction, and two spaces, which communicate with each other, between a space defined between the plungers and the plunger caps. A separator that divides the space
In the method for manufacturing a hydraulic lash adjuster, wherein the plunger portion and the plunger cap portion are made of the same material and are formed as one continuous piece without a joint, a partition wall formed in a radial direction and partitioning the inside into two spaces. Preparing a cylindrical member that is a single member having first and second cylindrical portions with the partition wall sandwiched therebetween, and fitting the separator in the first cylindrical portion; In order to form the upper portion of the cylindrical portion into the plunger cap portion and the lower portion of the first cylindrical portion and the second cylindrical portion into the plunger portion, a chamber is formed between the partition wall and the main body. And forming into a perforated partition wall for defining.

Further, the method for manufacturing a hydraulic lash adjuster of the present invention is a hydraulic lash adjuster which is held in a cylinder head and transmits the rotational displacement of a cam to an intake / exhaust valve without producing a valve clearance. A plunger portion which is slidably fitted in a cup-shaped main body having an oil introduction port for introducing oil from the outside,
Two plunger caps, which are arranged above the plungers and are fitted in the main body so as to be slidable in the axial direction, and two spaces, which communicate with each other, between a space defined between the plungers and the plunger caps. In a method for manufacturing a hydraulic lash adjuster, which comprises a separator portion that is divided into spaces, and the plunger portion and the plunger cap portion are formed of the same material as a continuous one piece without a joint, the plunger cap portion is provided on one side. To prepare a cylindrical member that is a single member molded in, to fit the separator in the cylindrical member, and to use the cylindrical member as the plunger portion, the other side of the cylindrical member with the main body And forming a perforated partition wall for forming a chamber therebetween.

[0010]

With the above-described structure, the oil in the reservoir chamber flows from the reservoir chamber through the gap between the plunger portion and the plunger cap portion even when the engine is operating or when the engine is stopped (when left for a long time). It is possible to prevent leakage and finally leakage from the oil introduction port of the main body to the outside.

[0011]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, the same parts are designated by the same reference numerals. FIG. 1 is an axial sectional view showing a first embodiment in which the present invention is applied to an end pivot type lash adjuster. Rush adjuster 10
A substantially cylindrical cup-shaped main body that opens upward, that is, a main body 1, a substantially cylindrical plunger portion 3 slidably fitted in the main body 1, and a continuous and seamless joint with the plunger portion 3 And a plunger cap 2 that fits into the body 1 above the plunger 3.

The plunger cap portion 2 is provided with an oil ejection port 2a at its tip, and is held by a cap retainer 4 so as not to come off from the main body 1. The plunger cap portion 2 includes a small-diameter portion 2b provided with an oil ejection port 2a and a large-diameter cylindrical portion 2c continuous with the small-diameter portion 2b.
And consists of. At a predetermined position of the plunger portion 3, there is a wall portion 3a that partitions the inside of the main body 1 into two spaces and is provided with an orifice 5. A high pressure chamber 11 is defined between the wall portion 3a and the bottom portion of the main body 1. Is made. In the high-pressure chamber 11, a check ball 6 seated on the orifice 5, a retainer spring 8 biasing the check ball 6 to seat on the orifice 5, and a retainer 7 holding the check ball 6 and the retainer spring 8. , And a plunger spring 9 that abuts the retainer 7 against the wall 3a and biases the plunger 3 toward the plunger cap 2 side.

A reservoir chamber 15 is defined between the wall portion 3a of the plunger portion 3 and the plunger cap portion 2 on the side opposite to the high pressure chamber 11. Therefore, the check ball 6 opens and closes the orifice 5 in accordance with the pressure difference between the high pressure chamber 11 and the reservoir chamber 15, so that the reservoir chamber 1 is placed in the high pressure chamber 11.
Introduce a predetermined amount of oil from 5. Plunger cap part 2
A through hole 13 is provided in the large-diameter cylindrical portion 2c fitted in the main body 1. Therefore, oil such as engine oil introduced from the oil passage 29 provided in the cylinder head shown in FIG.
Through the annular groove 12 engraved on the inner peripheral surface of the main body 1,
First, enter the plunger cap 2 through the through hole 13,
After that, it is introduced into the reservoir chamber 15. The separator 14 is tightly fitted to the annular step portion 16 on the inner peripheral portion of the large-diameter cylindrical portion 2c of the plunger cap portion 2. The separator 14 has a truncated cone shape whose diameter is reduced toward the oil ejection port 2 a as a whole, and supplies the external supply oil introduced into the reservoir chamber 15 through the oil introduction port 1 a and the through hole 13. It is quickly oriented to the oil ejection port 2a.

Since the separator 14 is provided in the plunger cap portion 2, the lash adjuster 1 is externally attached.
The oil with a large amount of air introduced into 0 is oriented upward along the outer peripheral shape of the separator portion 14. This prevents oil containing a large amount of air from entering the reservoir chamber 15 defined between the separator portion 14 and the plunger portion 3, and oil enters into the high pressure chamber 11 as the lash adjuster 10 operates. I try not to let air get in. As can be clearly seen from FIG. 1, the plunger portion 3 and the plunger cap portion 2 are one continuous piece (one component).
It is formed as a structural member. In particular, it is preferable that the plunger portion 3 and the plunger cap portion 2 be formed as a single component from the same material so that there is no seam.

In the first embodiment, the plunger portion 3 and the plunger cap portion 2 are continuous (one piece).
Since it is formed as a structural member, there is no gap between the plunger portion and the plunger cap portion, so that the oil in the reservoir chamber can be prevented from leaking to the outside from the oil introduction port 1a of the main body. It should be noted that FIG. 1 shows a state in which the lash adjuster extends in the axial direction (the opposite of the "bottomed state"). Here, FIG. 2 is a sectional view when the lash adjuster 10 of the first embodiment is actually incorporated in the cylinder head of the engine. The cylinder head shown in FIG. 2 is a V-type engine, and therefore is inclined. The lash adjuster 10 is shown in FIG. 2 in a “bottomed state” in which the high pressure chamber 11 is most crushed. Further, it goes without saying that the lash adjuster according to another embodiment of the present invention can be incorporated.

As is apparent from FIG. 2, when the oil inlet 1a is at a low position, a considerable amount of oil is leaked from the lash adjuster 10 that is inclined and assembled in the cylinder head until the engine starts. It is expected that it will end up. The lash adjuster 10 is fitted in a substantially cylindrical pocket 28 provided in the cylinder head 30. The pocket 28 is provided with an oil passage 29 through which engine oil or the like is introduced. Oil such as engine oil is introduced from the oil introduction port 1a through the oil passage 29. The tip of the plunger cap 2 is in contact with one end of the swing arm 20. A cam 21 rotatably supported by a rotating shaft 23 is rotatably in contact with a surface 20b of the swing arm 20. In FIG. 4, the cam nose 22 of the cam 21 is shown in contact with the surface 20b and stopped. Since the through hole 20a is provided at one end of the swing arm 20 that abuts on the plunger cap portion 2 so as to face the oil jet port 2a, the engine oil that has passed through the lash adjuster 10 penetrates the oil jet port 2a and the oil jet port 2a. The sliding surface between the cam surface and the surface 20b is lubricated through the hole 20a.

One end of an intake / exhaust valve 24 is engaged with the other end of the swing arm 20. The intake / exhaust valve 24 is biased by a valve spring 25 in a direction to close the intake / exhaust port 27. As already mentioned, FIG. 2 shows the cam nose 2
2 shows a state where the cam 2 is in contact with the swing arm 20, that is, when the cam nose is stopped. When the engine is started in this state, the lash adjuster 10 rapidly expands and sucks air from the outside through the oil ejection port 2a, but when the oil level in the reservoir chamber 15 is particularly low, The air will penetrate into the high pressure chamber 11. However, in each of the embodiments of the present invention, since the plunger portion 3 and the plunger cap portion 2 are formed as a continuous member (one component), there is no gap between the plunger portion and the plunger cap portion. , The oil in the reservoir chamber passes through these gaps and the oil introduction port 1 of the main body 1
It is possible to prevent leakage from a to the outside. As a result,
Coupled with the provision of the separator 14, the oil level in the reservoir chamber 15 is constantly maintained at a high position, so that a sufficient amount of oil is always contained in the reservoir chamber 15, Air does not enter from
Intake of air into the high pressure chamber 11 can be prevented.

The horizontal oil level 1 in the reservoir chamber 15 is
Since the lash adjuster 10 is used in the cylinder head of a V-type engine, the holes 14 of the separator 14 are
It is at the open end level of a. However, since the plunger portion 2 and the plunger cap portion 3 are formed as a single unit, there is no gap between the plunger portion 2 and the plunger cap portion 3, and the oil in the reservoir chamber 15 does not flow through the gap communicating with the outside. There is no risk of leakage to the outside through the oil inlet 1a.

Next, a method of manufacturing the lash adjuster 10 according to the first embodiment of the present invention will be described with reference to FIGS. First, as shown in FIG. 3, both ends are opened, and the first cylindrical portion 1
02 and the second cylindrical portion 103 to prepare a single cylindrical member 100. Inside the cylindrical member 100, between the first cylindrical portion 102 and the second cylindrical portion 103, a partition wall 101 that partitions the inside of the cylindrical member 100 into two spaces is provided at a predetermined axial position. . Cylindrical member 100
Is formed by forging or cutting. Also,
The thickness of the first cylindrical portion 102 in the radial direction differs at a predetermined position in the axial direction, and is closer to the center than the open end side, that is, the inner peripheral surface 105 side is thick. An annular step portion 104 is provided at the boundary portion.

Next, the partition wall 101 is provided with an orifice 5 penetrating in the axial direction to form a wall portion 3a of the high pressure chamber 11. Further, as shown in FIG. 4, the separator 14 including the conical portion 14c and the cylindrical portion 14b integral therewith is inserted from the open end of the first cylindrical portion 102, with the cylindrical portion 14b first. As a result, the reduced-diameter open hole 14a of the separator 14 faces the oil ejection port 2a of the plunger cap portion 2. Referring now to FIG. 4, the separator 14 includes a step 10
4 is inserted until the open end of the cylindrical portion 14b abuts, and is tightly fitted to the large-diameter cylindrical portion 2c of the plunger cap portion 2.

After fitting the separator 14, the plunger cap 2 is formed by drawing.
The oil ejection port 2a is also formed. This final state is shown in FIG. As in the state of FIG. 4, the lash adjuster 10 is configured by fitting the plunger cap portion 2 and the plunger portion 3 fitted with the separator 14 into the main body 1. FIG. 2 shows a state in which the lash adjuster 10 is incorporated in the cylinder head. still,
The high pressure chamber 11 is not shown in FIG. A through hole 13 for introducing oil into the plunger portion 3 and the plunger cap portion 2 is provided in the large-diameter cylindrical portion 2c of the plunger cap portion 2. According to the present embodiment, since the plunger portion 2 and the plunger cap portion 3 are made of the same material and have a continuous single structure, there is no gap between the plunger portion 2 and the plunger cap portion 3, and the reservoir chamber 15 It is possible to prevent the oil inside from leaking to the outside through the oil introduction port 1a.

Finally, referring to FIGS. 5 and 6, the second aspect of the present invention is described.
A method for manufacturing the lash adjuster of the embodiment will be described.
First, as shown in FIG. 5, the plunger cap portion 2 is attached to one side.
A cylindrical member 110 having a single structure is prepared. The cylindrical member 110 is formed by forging or cutting. Further, on the other side of the cylindrical member 110, three inner peripheral surfaces 113, 114 and 11 having different radial thicknesses are provided.
5 is formed. The structure is thicker in the center than in the open end side. An annular step 112 is formed between the inner peripheral surfaces 113 and 114, and an annular step 111 is formed between the inner peripheral surfaces 114 and 115. As shown in FIG. 6, the separator 14 including the conical portion 14c and the cylindrical portion 14b integral therewith is provided with the conical portion 1 from the open end opposite to the plunger cap portion 2 of the cylindrical member 110.
Put 4c first. As a result, the reduced-diameter open hole 14a of the separator 14 faces the oil ejection port 2a of the plunger cap portion 2.

The separator 14 has a conical portion 14c.
It is fitted in until a part of the outer peripheral surface of the is in contact with the step 111. The cylindrical portion 14b of the separator 14 has an inner peripheral surface 11
Closely fit in 4. Oil jet 2a of plunger cap 2
Since the impact due to the impact of the cam 21 is transmitted to the tip provided with the through the swing arm 20 shown in FIG. 2, the separator 14 may move upward during the operation. Therefore, the step portion 111 functions not only to position the separator 14 when the separator 14 is fitted but also to prevent this movement of the separator 14. After fitting the separator 14, the cylindrical member 1
Form the open end of 10 by drawing (reducing diameter) etc.,
The wall portion 3a of the high pressure chamber 11 (not shown in FIG. 6) is formed.
At the same time, an orifice 5 penetrating in the axial direction is formed. A through hole 13 for introducing oil into the plunger portion 3 and the plunger cap portion 2 is provided in the large-diameter cylindrical portion 2c of the plunger cap portion 2.

According to this embodiment, since the plunger portion 2 and the plunger cap portion 3 are made of the same material and have a continuous single structure, there is no gap between the plunger portion 2 and the plunger cap portion 3, It is possible to prevent the oil in the reservoir chamber 15 from leaking to the outside through the oil introduction port 1a. In each of the embodiments of the present invention, the oil passing through the inside is explained as the lash adjuster of the type in which the lubricating surface of the cam is lubricated by discharging from the oil jet outlet, but the present invention is applicable to lash adjusters other than such a type It goes without saying that it is also applicable.

[0025]

According to the lash adjuster of the present invention described above, the following effects can be obtained. Since the plunger portion and the plunger cap portion are made of the same material and have a continuous single structure, no gap is formed between the plunger portion and the plunger cap portion. Therefore,
There is no possibility that the oil in the reservoir chamber 15 leaks to the outside of the lash adjuster through the gap. Also, no welding process is required. Therefore, the oil level in the reservoir chamber can always be kept high, and the maximum amount of oil can always be retained in the reservoir chamber. Therefore, it is possible to prevent external air from entering the high-pressure chamber when the engine is started. In particular, in the case of long-term stoppage in the case of being arranged at an inclination, it is possible to leak a considerable amount of oil in the conventional case, which is more effective. For this reason, it is possible to provide a lash adjuster that maintains stable rigidity in the high-pressure chamber and has stable operation.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a lash adjuster of the present invention.

FIG. 2 is a sectional view of the cylinder head shown with the lash adjuster of the first embodiment incorporated.

FIG. 3 is a vertical cross-sectional view showing a method of manufacturing a plunger cap portion, a plunger portion and a separator of the lash adjuster of the first embodiment.

FIG. 4 is a vertical cross-sectional view showing a method of manufacturing a plunger cap portion, a plunger portion and a separator of the lash adjuster of the first embodiment.

FIG. 5 is a vertical cross-sectional view showing a method of manufacturing a plunger cap portion, a plunger portion and a separator of a lash adjuster according to a second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a method of manufacturing a plunger cap portion, a plunger portion and a separator of a lash adjuster according to a second embodiment of the present invention.

[Explanation of symbols for main parts]

 1 …………… Main unit 2 …………… Plunger cap part 3 …………… Plunger part 14 …………… Separator 15 …………… Reservoir chamber 10 …………… Rush adjuster

Claims (3)

[Claims] 1. A hydraulic lash adjuster held in a cylinder head for transmitting rotational displacement of a cam to an intake / exhaust valve without producing a valve clearance, and having an oil introduction port for introducing oil from the outside. A cup-shaped main body, a plunger portion fitted in the main body so as to be slidable in the axial direction, and a plunger cap portion arranged above the plunger portion and fitted in the main body so as to be slidable in the axial direction, A separator that divides a space defined between the plunger portion and the plunger cap portion into two spaces that communicate with each other, and the plunger portion and the plunger cap portion are made of the same material and are seamless and continuous. A hydraulic lash adjuster characterized by being formed as a structure. 2. A hydraulic lash adjuster held in a cylinder head for transmitting rotational displacement of a cam to an intake / exhaust valve without producing a valve clearance, and having an oil introduction port for introducing oil from the outside. A plunger portion axially slidably fitted in the cup-shaped main body, a plunger cap portion arranged above the plunger portion and axially slidably fitted in the main body, and the plunger portion. A separator that divides the space defined between the plunger cap portion and two spaces that communicate with each other, and the plunger portion and the plunger cap portion are formed of the same material as a continuous and seamless single-piece structure. In the method for manufacturing a hydraulic lash adjuster, a partition wall formed in a radial direction and partitioning the inside into two spaces is provided. Preparing a cylindrical member that is a single member having first and second cylindrical portions with a wall in between, fitting the separator in the first cylindrical portion, and an upper portion of the first cylindrical portion Is molded into the plunger cap portion, and the lower portion of the first cylindrical portion and the second
A cylindrical part and a plunger part to form the plunger part, and the partition wall to form a chamber between the partition wall and the main body. Production method. 3. A hydraulic lash adjuster which is held in a cylinder head and transmits the rotational displacement of a cam to an intake / exhaust valve without producing a valve clearance, and has an oil introduction port for introducing oil from the outside. A plunger portion axially slidably fitted in the cup-shaped main body, a plunger cap portion arranged above the plunger portion and axially slidably fitted in the main body, and the plunger portion. And a separator part that divides a space defined between the plunger cap part and two spaces communicating with each other, and the plunger part and the plunger cap part are formed of the same material as a continuous single structure. In the method for manufacturing a hydraulic lash adjuster that is used, a cylinder that is one member formed on the plunger cap portion on one side. To prepare a member, to fit the separator in the cylindrical member, and to form the chamber between the other side of the cylindrical member and the main body because the cylindrical member serves as the plunger portion. A method for manufacturing a hydraulic lash adjuster, which comprises: forming a perforated partition wall;