JP2017082643A - Rush adjuster - Google Patents

Abstract

A lash adjuster capable of reducing the number of parts is provided.
A lash adjuster 10 includes a bottomed cylindrical body 11 inserted into a mounting hole 92 of a cylinder head 90, and a body according to the pressure of hydraulic oil inserted into the body 11 and supplied to the inside. 11 and a plunger 12 movable in the axial direction. A sliding portion 34 is formed on the outer peripheral surface of the plunger 12 so as to slide on the inner peripheral surface of the body 11. At the opening end portion of the peripheral wall 15 of the body 11, a slip-out restricting portion 23 that is in contact with the sliding portion 34 and restricts the pull-out of the plunger 12 from the body 11 is formed by bending inward.
[Selection] Figure 3

Description

  The present invention relates to a lash adjuster.

  The lash adjuster disclosed in Patent Document 1 includes a bottomed cylindrical body that is inserted into the mounting hole of the cylinder head, and a bottomed cylindrical plunger that is inserted into the body so as to be movable in the axial direction. Yes. A high pressure chamber is formed in a portion of the body that is partitioned by the bottom surface of the plunger, and a low pressure chamber is formed in the plunger. An outer oil hole is formed in the peripheral wall of the body, and an inner oil hole is formed in the peripheral wall of the plunger. The hydraulic oil flowing through the oil gallery of the cylinder head flows into the low pressure chamber and the high pressure chamber through the outer oil hole and the inner oil hole, and the plunger can slide in the axial direction with respect to the body according to the hydraulic pressure of the hydraulic oil. ing.

  A caulking member separate from the body and the plunger is attached to the opening end of the peripheral wall of the body. A seal member is mounted between the caulking member and the plunger, and the gap between the plunger and the body is closed by the seal member.

Japanese Patent No. 5456567

  In the case of the conventional lash adjuster described above, a seal member and a caulking member are required to restrict the plunger from coming out of the body. Therefore, there is a concern that the number of parts increases, the structure becomes complicated, and the assembly work becomes complicated. It was.

  The present invention has been completed based on the above situation, and an object thereof is to provide a lash adjuster capable of reducing the number of parts.

  The lash adjuster of the present invention includes a bottomed cylindrical body that is inserted into a mounting hole of a cylinder head, and an axial direction in the body according to the pressure of hydraulic oil that is inserted into the body and supplied to the inside. A plunger that is movable on the outer peripheral surface of the plunger, and a sliding portion that is slidable on the inner peripheral surface of the body is formed on the outer peripheral surface of the plunger. It has a feature in that a slip-out restricting portion that is in contact with the plunger and restricts the pull-out of the plunger from the body is bent inward.

  The escape restriction part that restricts the plunger from coming out from the body is bent inward at the opening end of the peripheral wall of the body, so there is no need to prepare a dedicated escape restriction member like a conventional caulking member. The number of parts can be reduced. In addition, the clearance between the plunger and the body is closed by the sliding portion, and the hydraulic oil can be prevented from flowing out. In addition, since the plunger is allowed to freely rotate in the body, uneven wear of the sliding portion between the plunger and the body can be suppressed.

It is sectional drawing of the valve operating apparatus incorporating the lash adjuster which concerns on Example 1 of this invention. It is sectional drawing of the part corresponding to the lash adjuster in FIG. It is principal part sectional drawing of the lash adjuster inserted in the attachment hole of a cylinder head. It is principal part sectional drawing of a lash adjuster before a pull-out control part and a rotation control part are bent and formed. FIG. 5 is a cross-sectional view of a main part of a lash adjuster in which a restricting portion is bent out from the state of FIG. 4 by a jig. It is principal part sectional drawing of the lash adjuster by which the rotation control part was bent and formed with the jig | tool from the state of FIG. It is an external view of the body before the withdrawal restricting portion and the rotation restricting portion are bent. It is an expanded sectional view which shows the state which extracts a plunger from a body with a taking-out jig. In the lash adjuster according to the second embodiment of the present invention, it is an enlarged cross-sectional view showing a state in which the edge portion of the rotation restricting portion bites into and is engaged with the inner peripheral surface of the cylinder head. In the lash adjuster according to Embodiment 3 of the present invention, it is a cross-sectional view in a plan view direction showing a state in which the rotation restricting portion is inserted and locked in a recess formed in the inner peripheral surface of the cylinder head. In the lash adjuster which concerns on Example 4 of this invention, it is sectional drawing of the part which comprises the low-rigidity part of a body. In the lash adjuster which concerns on Example 5 of this invention, it is a principal part external view of the body before a rotation control part is bent and formed. It is sectional drawing of the planar view direction which shows the state by which the edge part of the rotation control part bite into the inner peripheral surface of the cylinder head, and was latched.

Preferred embodiments of the present invention are shown below.
Of the opening end portion of the peripheral wall of the body, a portion different from the withdrawal restricting portion is in contact with the inner peripheral surface or the opening edge of the mounting hole of the cylinder head and around the axis of the body in the mounting hole. A rotation restricting portion that restricts rotation is formed by bending outward. By restricting rotation around the axis of the body in the mounting hole by such a rotation restricting portion, for example, the body side oil passage hole formed in the peripheral wall of the body can be positioned upward, and thus supplied to the inside It is possible to prevent the hydraulic oil from leaking outside. Further, since the rotation restricting portion is formed to be bent outward at the opening end portion of the peripheral wall of the body, it is not necessary to prepare a dedicated rotation restricting member, and the number of parts can be further reduced.

  The rotation restricting portion is formed by partially cutting and raising the opening end portion of the body. According to this, while being able to manufacture a rotation control part easily, the freedom degree at the time of setting the protrusion amount and shape of a rotation control part can be raised.

  The rotation restricting portion has an edge portion that bites into the inner peripheral surface of the mounting hole of the cylinder head. According to this, rotation around the axis of the body in the mounting hole can be more reliably regulated. Further, since it is not necessary to newly provide a special structure for locking with the rotation restricting portion on the cylinder head side, it is possible to avoid a complicated structure on the cylinder head side.

  An opening end portion of the peripheral wall of the body is a low-rigidity portion that is more easily deformable than an adjacent region of the peripheral wall. According to this, the slip-out restricting portion (including the rotation restricting portion in the case of the second invention) can be easily bent, and cracks and breakage are less likely to occur at the opening end portion of the peripheral wall.

<Example 1>
Embodiment 1 will be described below with reference to FIGS. The lash adjuster 10 according to the first embodiment is configured as a hydraulic lash adjuster incorporated in a valve gear of an internal combustion engine.

  As shown in FIG. 1, the valve gear includes a valve 60, a rocker arm 70, and a cam 80 in addition to the lash adjuster 10. The valve 60 is incorporated in the cylinder head 90 so that the intake or exhaust port 91 can be opened and closed. The rocker arm 70 is installed between a later-described support portion 13 of the lash adjuster 10 and one end portion of the valve 60. The cam 80 is slidably disposed with a roller 71 provided rotatably on the rocker arm 70. When the cam 80 is rotated by driving the engine, the rocker arm 70 swings with the support portion 13 of the lash adjuster 10 as a fulcrum, and the valve 60 is displaced in the axial direction so that the intake or exhaust port 91 is opened and closed. .

  A bottomed mounting hole 92 into which the lash adjuster 10 can be inserted is formed on the outer surface of the cylinder head 90. The mounting hole 92 has a circular cross section and opens obliquely downward, and the lash adjuster 10 is inserted into the mounting hole 92 with the support portion 13 facing obliquely upward. An oil passage 93 (oil gallery) passing through the inside of the cylinder head 90 is opened and communicated with the inner peripheral surface of the mounting hole 92.

Next, the lash adjuster 10 will be described.
As shown in FIG. 2, the lash adjuster 10 includes a body 11 and a plunger 12. The body 11 has a circular bottom wall 14 and a cylindrical peripheral wall 15 extending from the outer periphery of the bottom wall 14. A body-side groove 16 is formed over the entire outer peripheral surface of the peripheral wall 15 of the body 11, and a body-side oil passage hole 17 (oil supply hole) penetrates in the wall thickness direction on the inner surface of the body-side groove 16. Is formed. When the lash adjuster 10 is inserted into the mounting hole 92 of the cylinder head 90, the body side oil passage hole 17 communicates with the oil passage 93 through the body side concave groove 16.

  The opening end portion of the peripheral wall 15 of the body 11 is a low-rigidity portion 18 that is lower in rigidity and easier to deform than a region 19 adjacent to the peripheral wall 15 (an upper region of the body-side concave groove 16 shown in FIG. 2). The low rigidity portion 18 is configured as a thin portion that becomes thinner as it goes to the opening end. As shown in FIG. 4, almost the entire outer peripheral surface of the low-rigidity portion 18 is reduced in a taper shape toward the opening end in a state before a slip-out restricting portion 23 and a rotation restricting portion 24 described later are formed. An outer inclined surface 21 is formed, and the tip end side of the inner peripheral surface of the low-rigidity portion 18 is an inner inclined surface 22 that increases in diameter toward the opening end in a tapered shape.

  As shown in FIG. 3, the low-rigidity part 18 is integrally formed with a pull-out restricting part 23 and a rotation restricting part 24. The slip-out restricting portion 23 is formed in an arc shape in plan view, more specifically in a dominant arc shape in plan view, in a region excluding the rotation restricting portion 24 in the circumferential direction of the low-rigidity portion 18 and is bent slightly toward the inside. ing. Specifically, the withdrawal restricting portion 23 is configured to incline inward from the middle in the axial direction of the low-rigidity portion 18, and in a state where the body 11 is assembled to the plunger 12, one end of a sliding portion 34 described later of the plunger 12. It arrange | positions so that an outer surface may be covered along the circumferential direction from the outer side.

  The rotation restricting portion 24 cuts a portion between a pair of cuts 25 (see FIG. 7) formed in parallel to each other at two locations spaced in the circumferential direction in the low-rigidity portion 18 toward the outside. It is formed. Specifically, the rotation restricting portion 24 has a substantially rectangular protruding piece shape and is inclined outward from the root portion of the low-rigidity portion 18 as shown in FIG. Further, the rotation restricting portion 24 is disposed on the circumferential wall 15 of the body 11 at a position opposite to the body-side oil passage hole 17 in the circumferential direction. When the body 11 is inserted into the mounting hole 92 of the cylinder head 90, the rotation restricting portion 24 is disposed so as to be able to press contact or abut against the opening end of the mounting hole 92 from the outside. In the case of Example 1, the rotation restricting portion 24 has a portion that protrudes outward from the opening end of the mounting hole 92.

  The plunger 12 has a circular bottom wall portion 26 and a cylindrical peripheral wall portion 27 extending from the outer periphery of the bottom wall portion 26. Inside the hollow of the plunger 12 is a low pressure chamber 28. In the center of the bottom wall portion 26, a circular valve hole 29 is formed penetrating in the wall thickness direction (also in the axial direction).

  A top portion of the peripheral wall portion 27 is a substantially hemispherical support portion 13. The support portion 13 is a rocking fulcrum of the rocker arm 70, and the rocker arm 70 abuts on the outer peripheral surface of the rocker arm 70 and is slidably supported. A shaft hole 31 is formed in the top center of the support portion 13 so as to penetrate in the axial direction.

  A plunger-side groove 32 is formed over the entire circumference of the outer peripheral surface of the peripheral wall 27, and a plunger-side oil passage hole 33 is formed through the inner surface of the plunger-side groove 32 in the wall thickness direction. . The plunger 12 is fitted in the body 11 and is movable in the axial direction. When the plunger 12 is fitted in the body 11, the plunger-side oil passage hole 33 communicates with the body-side oil passage hole 17 through the plunger-side groove 32.

  An annular belt-shaped sliding portion 34 is formed over the entire circumference of the outer peripheral surface of the peripheral wall portion 27 of the plunger 12 in the region above the plunger-side concave groove 32. The sliding portion 34 serves as a seal that slides on the inner peripheral surface of the body 11 during the movement of the plunger 12 and prevents the hydraulic oil supplied to the inside from flowing out.

  As shown in FIG. 2, a high-pressure chamber 35 partitioned from a low-pressure chamber 28 by a bottom wall portion 26 of the plunger 12 is formed at the hollow lower end portion of the body 11. A spherical valve body 36 is accommodated in the high pressure chamber 35 while being biased in a direction to close the valve hole 29 by a first spring 37. The valve body 36 is accommodated in a ball cage 38, and the first spring 37 is mounted between the ball cage 38 and the valve body 36. A second spring 39 is mounted between the ball cage 38 and the inner bottom surface of the bottom wall 14 of the body 11. The plunger 12 is urged together with the ball cage 38 by the second spring 39 in a direction protruding from the cylinder head 90. The hydraulic fluid flowing in the oil passage 93 of the cylinder head 90 is stored in the low pressure chamber 28 through the body side groove 16, the body side oil passage hole 17, the plunger side groove 32 and the plunger side oil passage hole 33. Further, the high pressure chamber 35 is filled through the valve hole 29.

  Here, when a pressing force is applied to the plunger 12 from the rocker arm 70 side as the cam 80 rotates, the valve body 36 closes the valve hole 29 to seal the inside of the high pressure chamber 35, and the operation in the high pressure chamber 35 is performed. The oil prevents the plunger 12 from sinking. When the plunger 12 protrudes greatly from the mounting hole 92 due to the further rotation of the cam 80 and the volume of the high pressure chamber 35 increases, the valve body 36 moves away from the bottom wall portion 26 and opens the valve hole 29, so that the hydraulic oil is pressurized from the low pressure chamber 28. The state which flows in the chamber 35 and the hydraulic oil is filled in the high pressure chamber 35 is maintained. When the protrusion of the plunger 12 stops, the valve body 36 is urged by the first spring 37 to close the valve hole 29, and the high pressure chamber 35 is in a sealed state filled with hydraulic oil.

  By the way, if the body 11 rotates around the axis in the mounting hole 92 and the body side oil passage hole 17 is opened downward when the engine is stopped, the hydraulic oil in the low pressure chamber 28 is moved to the body side oil passage hole 17. May flow out to the outside, and a sufficient amount of hydraulic oil may not be stored in the low pressure chamber 28. However, in the case of the first embodiment, as shown in FIG. 2, the rotation restricting portion 24 formed integrally with the low-rigidity portion 18 of the body 11 abuts on the opening end of the mounting hole 92 of the cylinder head 90 in a pressure contact state. Since frictional resistance is generated between the rotation restricting portion 24 and the cylinder head 90, the body 11 can be prevented from rotating around the axis in the mounting hole 92. Therefore, it is possible to ensure that the body-side oil passage hole 17 opens upward in the peripheral wall 15 of the body 11 and to prevent the hydraulic oil in the low-pressure chamber 28 from flowing out to the outside.

  Further, in a state before the lash adjuster 10 is incorporated in the valve operating device, the pressing force from the rocker arm 70 side does not act on the support portion 13 of the plunger 12, so that the plunger 12 may come out of the body 11. In such a case, conventionally, a separate caulking member is caulked and fixed to the opening edge of the peripheral wall 15 of the body 11, and the caulking member locks the plunger 12, thereby preventing the plunger 12 from coming out of the body 11. It is like that. However, in this case, a caulking member must be prepared separately from the plunger 12 and the body 11, and there is a problem that the number of parts increases.

  In that respect, according to the first embodiment, in a state where the plunger 12 is inserted into the body 11, the withdrawal restricting portion 23 formed integrally with the low-rigidity portion 18 of the body 11 has an outer surface at one end of the sliding portion 34 of the plunger 12. The plunger 12 can be prevented from coming out of the body 11 by abutting on. Therefore, it is not necessary to prepare a separate caulking member, and the number of parts can be reduced accordingly. Further, as a result of not using the caulking member, the number of assembling steps can be reduced, the troublesome part management can be reduced, and the cost can be reduced.

  By the way, the pull-out restricting portion 23 and the rotation restricting portion 24 are formed using a jig 50 shown in FIG. The jig 50 is a tubular member that is elongated in the axial direction, and is movable in the axial direction. Of the tip annular portion of the jig 50, a part in the circumferential direction is a first pressing surface 51 for press-molding the slip-out restricting part 23, and the other part in the circumferential direction is press-molding the rotation restricting part 24. Therefore, the second pressing surface 52 is provided. The first pressing surface 51 is configured to expand in a tapered shape toward the tip, and is disposed in a large area in the circumferential direction in the tip annular portion of the jig 50. On the other hand, the second pressing surface 52 is configured to be tapered toward the tip, and is shortly arranged in the remaining region of the first pressing surface 51 in the tip annular portion of the jig 50.

  When forming the pull-out restricting portion 23 and the rotation restricting portion 24, as shown in FIG. 7, a pair of incisions 25 having a predetermined depth in the axial direction from the opening end are made in advance in the low-rigidity portion 18 of the body 11. Next, the plunger 12 is inserted into the body 11. From this state, when the jig 50 is pulled down in the axial direction, the tip annular portion of the jig 50 comes into contact with the low-rigidity portion 18 of the body 11, and the first pressing surface 51 of the jig 50 has the low-rigidity portion 18. By sliding on the outer inclined surface 21, the corresponding portion of the low-rigidity portion 18 is inclined inward to form the withdrawal restricting portion 23 (see FIG. 5), and the second pressing surface 52 of the jig 50 is By sliding on the inner inclined surface 22 of the low-rigidity portion 18, a corresponding portion of the low-rigidity portion 18, specifically, a portion between the pair of cuts 25 is inclined outward to form a rotation restricting portion 24 (see FIG. 6). After forming the bending-out restricting portion 23 and the rotation restricting portion 24, the jig 50 is pulled up in the axial direction. When the slip-out restricting portion 23 is formed, the corresponding portion of the low-rigidity portion 18 is bent and deformed with one end of the sliding portion 34 as a substantial fulcrum, and the slip-out restricting portion 23 is outside the one end outer surface of the sliding portion 34. It will be arranged to face from.

  Further, when the lash adjuster 10 is taken out from the mounting hole 92 of the cylinder head 90 due to maintenance or the like, a take-out jig 55 shown in FIG. 8 is used. Although not shown in detail, the take-out jig 55 is formed in a pliers shape, and the engagement portion 56 on one end side is pressed against the rotation restricting portion 24 from the outside, and the rotation restricting portion 24 is bent inward to rotate. The locked state between the restricting portion 24 and the cylinder head 90 is released. After that, it is only necessary to pull out the lash adjuster 10 from the mounting hole 92 of the cylinder head 90. In the case of the first embodiment, since the rotation restricting portion 24 is disposed so as to face the opening edge of the mounting hole 92 of the cylinder head 90, the lash adjuster 10 can be easily taken out using the take-out jig 55.

  As described above, according to the first embodiment, the slip-out restricting portion 23 is formed to be bent inward in the low-rigidity portion 18 of the body 11, so that a dedicated slip-out restricting member such as a conventional caulking member is provided. There is no need to prepare, and the number of parts can be reduced. In this case, since the low-rigidity portion 18 has a structure that is more easily deformable than the adjacent region 19 of the peripheral wall 15, the pull-out restricting portion 23 and the rotation restricting portion 24 can be easily bent and formed. It becomes difficult for cracks and breakage after heat treatment to occur at the opening end of the.

  Further, since the rotation restricting portion 24 is formed on the low rigidity portion 18 of the body 11 so as to be bent outward at a position different from the pull-out restricting portion 23 in the circumferential direction, the body side oil passage hole 17 is set at a predetermined position. The hydraulic oil stored in the low-pressure chamber 28 can be prevented from flowing out. Also in this case, since it is not necessary to prepare a dedicated rotation restricting member, the number of parts can be further reduced.

  Furthermore, since the rotation restricting portion 24 is formed by partially cutting and raising the low-rigidity portion 18 of the body 11, the degree of freedom when setting the protrusion amount and shape of the rotation restricting portion 24 can be increased.

<Example 2>
FIG. 9 shows a second embodiment of the present invention. In the case of the second embodiment, the rotation restricting portion 24 </ b> A is inserted into the mounting hole 92 of the cylinder head 90 and has an edge portion 41 protruding outward.

  When the lash adjuster 10 is inserted into the mounting hole 92 of the cylinder head 90 and rotates even slightly around the axis, the edge portion 41 of the rotation restricting portion 24A bites into the inner peripheral surface of the cylinder head 90, and thus around the axis of the body 11 The rotation of is now regulated. As described above, if the edge portion 41 of the rotation restricting portion 24 </ b> A bites into the cylinder head 90, the rotation around the axis of the body 11 can be more reliably restricted. Further, as in the first embodiment, it is not necessary to newly provide a special structure for locking to the rotation restricting portion 24A on the cylinder head 90 side, so that the structure on the cylinder head 90 side is avoided from being complicated. Can do. In the second embodiment and later-described third to fifth embodiments, the same or corresponding structures as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

<Example 3>
FIG. 10 shows a third embodiment of the present invention. In the third embodiment, a recess 95 that receives the rotation restricting portion 24 is provided on the inner peripheral surface of the mounting hole 92 of the cylinder head 90. The rotation restricting portion 24 is inserted and locked by fitting the protruding end side of the rotation restricting portion 24 into the recess 95. Thereby, rotation around the axis of the body 11 in the mounting hole 92 of the cylinder head 90 is more reliably regulated, and the rotation regulating portion 24 is positioned in the circumferential direction in the mounting hole 92, and the body-side oil passage hole. 17 can be reliably arranged at a predetermined position.

<Example 4>
FIG. 11 shows a fourth embodiment of the present invention. In the case of the fourth embodiment, an annular groove 43 is formed on the inner peripheral surface of the low rigidity portion 18 of the body 11 over the entire circumference. Therefore, the rigidity of the low-rigidity portion 18 is lower than that of the first embodiment, and the slip-out restricting portion 23 and the rotation restricting portion 24 can be bent more smoothly and the resistance to cracking can be further improved. The annular groove 43 may be formed on the outer peripheral surface of the low rigidity portion 18.

<Example 5>
12 and 13 show a fifth embodiment of the present invention. In the case of the fifth embodiment, the rotation restricting portion 24 </ b> B is configured to protrude in a direction orthogonal to the axial direction of the peripheral wall 15 of the body 11 and intersecting the circumferential direction. It is installed at a plurality of locations with a gap, in detail, at two locations with an interval of 180 degrees. The rotation restricting portion 24 </ b> B has an edge portion 41 </ b> B that is inserted into the mounting hole 92 of the cylinder head 90 and bites into the inner peripheral surface of the mounting hole 92 when the body 11 rotates about the axis in the mounting hole 92. Yes.

  An L-shaped cut 25B is made in the low rigidity portion 18 of the body 11 from the opening end, and a rotation restricting portion 24B is formed by bending a portion inside the cut 25B outward. According to the fifth embodiment, the edge portion 41B of the rotation restricting portion 24B bites into the inner peripheral surface of the attachment hole 92 against the rotation direction of the body 11 in the attachment hole 92. Rotation is more reliably prevented.

<Other embodiments>
Other embodiments will be briefly described below.
(1) The low-rigidity part may not be thinned and may be reduced in rigidity by not being subjected to heat treatment. In this case, heat treatment may be performed on portions other than the low-rigidity portion of the body. In addition, the portion to be heat-treated may be quenched with high frequency, while the low rigidity portion may be tempered after quenching with high frequency or the like to reduce the hardness.
(2) It is also possible to omit the rotation restricting portion from the peripheral wall of the body.
(3) The withdrawal restricting portion may be provided at a plurality of locations spaced in the circumferential direction.
(4) The rotation restricting portion may be provided at a plurality of locations spaced in the circumferential direction.
(5) The lash adjuster may be inserted into the mounting hole of the cylinder head along the vertical direction (gravity direction) or inserted along the horizontal direction. Furthermore, the support part of the plunger may be arranged facing downward.
(6) In the case of Example 1, the slip-out restricting portion and the rotation restricting portion are simultaneously formed with one jig. However, according to the present invention, the slip-out restricting portion and the rotation restricting portion are timed with one jig. It may be formed by opening, or may be individually formed with jigs corresponding to the slip-out restricting portion and the rotation restricting portion.

DESCRIPTION OF SYMBOLS 10 ... Rush adjuster 11 ... Body 12 ... Plunger 15 ... Peripheral wall 18 ... Low-rigidity part 19 ... Adjacent area | region of a peripheral wall 23 ... Outflow restriction part 24, 24A, 24B ... Rotation restriction part 34 ... Sliding part 41, 41B ... Edge part 90 ... Cylinder head 92 ... Mounting hole

Claims (5)

A bottomed cylindrical body that is inserted into the mounting hole of the cylinder head, and a plunger that is inserted into the body and is movable in the axial direction within the body in accordance with the pressure of hydraulic oil supplied to the inside. Prepared,
On the outer peripheral surface of the plunger, a sliding portion is formed that can slide on the inner peripheral surface of the body,
A lash adjuster characterized in that an opening restricting portion that is in contact with the sliding portion and restricts the plunger from coming out of the body is bent inward at an opening end portion of the peripheral wall of the body. .   Of the opening end portion of the peripheral wall of the body, a portion different from the withdrawal restricting portion is in contact with the inner peripheral surface or the opening edge of the mounting hole of the cylinder head and around the axis of the body in the mounting hole. The lash adjuster according to claim 1, wherein a rotation restricting portion for restricting rotation is formed to be bent outward.   The lash adjuster according to claim 2, wherein the rotation restricting portion is formed by partially cutting and raising an opening end portion of the body.   The lash adjuster according to claim 2 or 3, wherein the rotation restricting portion has an edge portion that bites into an inner peripheral surface of the mounting hole of the cylinder head.   The lash adjuster according to any one of claims 1 to 4, wherein an opening end portion of the peripheral wall of the body is a low-rigidity portion that is more easily deformable than a region adjacent to the peripheral wall.

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