JP2017072108A - Lash adjuster assembly structure - Google Patents

Abstract

There is a possibility that it is impossible to cope with a case where the end becomes thin due to a request for miniaturization because a thickness that can withstand the fixing of the positioning pin to the end of the plunger must be secured.
A lash adjuster is inserted into a bottomed mounting hole having a circular cross section provided in a cylinder head, and has an end-cylindrical outer housing having an oil supply hole, and the lash adjuster is inserted into the outer housing. And an inner housing 13 having a reservoir chamber 32 communicating with the oil supply hole 23 and sliding in the outer housing 12. A rotation restriction receiving portion 64 is provided on the bottom surface of the mounting hole 61 of the cylinder head 60. On the end surface of the end wall of the outer housing 12, a rotation restricting portion 18 that is received by the rotation restricting receiving portion 64 and restricts the rotation of the outer housing 12 around the axis in the mounting hole 61 is integrally provided.
[Selection] Figure 2

Description

  The present invention relates to a structure for assembling a lash adjuster.

  The lash adjuster disclosed in Patent Document 1 includes a cylindrical body (an outer housing) that is inserted into a bottomed recess of a cylinder head, and a plunger (an inner housing) that is slidably inserted into the body. A provided lash adjuster is disclosed. The top of the body is a hemispherical pivot that receives the load of the rocker arm. The plunger is provided with an oil supply port opened, and a positioning pin separate from the plunger is fitted to the end by press-fitting. The positioning pin protrudes from the plunger and is fitted into the pin hole of the cylinder head. A reservoir chamber communicating with the oil supply port is provided inside the plunger, and a high-pressure chamber is provided between the plunger and the body. At one end of the plunger, an oil passage is provided penetrating the high pressure chamber and the reservoir chamber so as to be opened and closed by a check valve.

  Oil flowing in the cylinder head is stored in the reservoir chamber from the oil supply port, and further filled from the reservoir chamber into the high-pressure chamber through the oil passage. The plunger can move (slide) in the axial direction in the body according to the hydraulic pressure of the high pressure chamber. In the case of this lash adjuster, since the positioning pin is attached so that the oil supply port always opens upward, it is possible to prevent oil in the reservoir chamber from coming out of the oil supply port when the engine is stopped.

Japanese Patent Laid-Open No. 62-282105

  However, in the above case, it is necessary to secure a thickness that can withstand the fixing of the positioning pin to the end portion of the plunger. Therefore, it may not be possible to cope with the case where the end portion becomes thin due to a request for downsizing. There is. In addition, since the positioning pin is provided separately from the plunger and the body, there is a problem that the number of parts increases and the assembling work becomes complicated.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a lash adjuster that can cope with downsizing and can reduce the number of parts.

  The present invention includes a cylindrical outer housing having an oil supply hole inserted into a bottomed mounting hole having a circular cross section provided in a cylinder head, and a reservoir that is inserted into the outer housing and communicates with the oil supply hole. And a lash adjuster assembly structure comprising an inner housing that slides in the outer housing in response to the pressure of a high-pressure chamber that communicates with the reservoir chamber via a valve portion. A rotation restriction receiving portion is provided on the bottom surface of the mounting hole, and a rotation that is received by the rotation restriction receiving portion on the end surface of the outer housing and restricts rotation around the axis of the outer housing in the attachment hole. It is characterized in that the restricting portion is provided integrally.

  According to the above configuration, since the rotation restricting portion is received by the rotation restricting receiving portion, the rotation of the outer housing around the axis of the mounting hole is restricted, so that the oil supply hole is located at a position where the hydraulic oil in the reservoir chamber does not leak. Can be positioned. As a result, sufficient hydraulic oil can be stored in the reservoir chamber. In this case, since the rotation restricting portion is integrally provided on the end surface of the outer housing, the number of parts can be reduced. Further, since it is not necessary to provide a hole for attaching the rotation restricting portion to the end wall of the outer housing, it is possible to cope with a small lash adjuster having a thin end wall.

In Example 1 of this invention, it is sectional drawing of the valve operating apparatus incorporating the lash adjuster. It is a sectional side view of the attachment structure of a lash adjuster. FIG. 3 is a cross-sectional plan view of a main part of FIG. 2. It is a principal part expanded side sectional view of Example 2 of the present invention.

Preferred embodiments of the present invention are shown below.
The rotation restriction receiving portion is recessed in the bottom surface of the mounting hole, the rotation restriction portion is protruded from an end surface of the outer housing, and the rotation restriction portion is fitted into the rotation restriction receiving portion. Since the rotation restricting portion protrudes from the end surface of the outer housing, the strength of the end wall of the outer housing can be ensured. In addition, since the rotation restriction receiving portion is recessed in the bottom surface of the mounting hole, it is not particularly difficult to manufacture the cylinder head.

  The rotation restriction receiving portion includes a center in the radial direction of the mounting hole, and the center when viewed from the opening side of the mounting hole is provided at a position eccentric from the radial center of the mounting hole. It has a drop guide surface that expands from the inner surface toward the outer periphery of the mounting hole. With such a configuration, even if the rotation restricting portion is not in a position where it can be fitted to the rotation restricting receiving portion when the outer housing is inserted into the attachment hole of the cylinder head, As the outer housing rotates, the rotation restricting portion is dropped into the rotation restricting receiving portion along the guide surface. As a result, the rotation restricting portion is fitted into the rotation restricting receiving portion, and the rotation of the outer housing in the mounting hole is restricted.

  The back surface of the rotation restriction receiving part and the protruding end surface of the rotation restriction part are both flat surfaces, and the protrusion dimension of the rotation restriction part is larger than the depth dimension of the rotation restriction receiving part. When the restricting portion is received by the rotation restricting receiving portion, the flat surfaces of the rotation restricting receiving portion and the rotation restricting portion come into contact with each other. When the flat surfaces of the rotation restriction receiving portion and the rotation restriction portion are in contact with each other, the outer housing is stably held in the mounting hole. Further, it is possible to prevent the bottom surface of the mounting hole from being damaged by interference with the rotation restricting portion. Furthermore, the depth dimension of the rotation restriction receiving part can be suppressed, and the fitting dimension between the rotation restriction receiving part and the rotation restriction receiving part can be reduced as a whole.

<Example 1>
Embodiment 1 of the present invention will be described below with reference to FIGS. The first embodiment relates to an assembly structure of a lash adjuster 10 incorporated in a valve operating device of an internal combustion engine of an automobile. Specifically, the lash adjuster 10 is inserted into an attachment hole 61 of a cylinder head 60, and rotation restriction is performed in the attachment hole 61. It relates to the structure assembled to the state. As shown in FIG. 2, the valve gear includes a valve 50, a rocker arm 80, a cam 90 and the like in addition to the lash adjuster 10.

  First, the configuration of the valve gear other than the lash adjuster 10 will be briefly described. The valve 50 is incorporated in the cylinder head 60 so that the intake or exhaust port 62 can be opened and closed. The rocker arm 80 is installed between a later-described support portion 11 of the lash adjuster 10 and one end portion of the valve 50. The cam 90 is slidably disposed with a roller 81 that is rotatably supported by the rocker arm 80. When the cam 90 rotates by driving the engine, the rocker arm 80 swings with the support portion 11 of the lash adjuster 10 as a fulcrum, and the valve 50 moves to open and close the intake or exhaust port 62.

  The lash adjuster 10 is inserted into a bottomed mounting hole 61 formed on the outer surface of the cylinder head 60. The mounting hole 61 has a circular cross section and opens obliquely downward, and the lash adjuster 10 is inserted into the mounting hole 61 with the support portion 11 facing obliquely downward.

An oil passage 63 (oil gallery) passing through the inside of the cylinder head 60 is opened and communicated with the lower portion of the inner peripheral surface of the mounting hole 61.
A rotation restriction receiving portion 64 is recessed in the bottom surface (back surface) of the mounting hole 61 of the cylinder head 60. The rotation restricting receiving portion 64 is a bottomed hole having a circular cross section. As shown in FIG. 3, the rotation restricting receiving portion 64 is attached to a wide area including the radial center C <b> 1 of the mounting hole 61 on the bottom surface of the mounting hole 61. Of the bottom surface of the hole 61, the hole 61 is provided in the majority of the region of the outer peripheral edge portion 65 remaining. Further, the radial center of the cross section of the rotation restriction receiving portion 64 (center when viewed from the opening side of the mounting hole 61) does not coincide with the radial center C <b> 1 of the bottom surface of the mounting hole 61. Located on radial line. That is, the rotation restriction receiving portion 64 is configured with a circular cross section that is eccentric to the bottom surface of the mounting hole 61.

  The bottom surface of the rotation restriction receiving portion 64 is a flat surface 66 having no unevenness along a direction orthogonal to the axial direction of the mounting hole 61, and has a circular outer peripheral contour shape. Further, as shown in FIG. 2, the peripheral surface of the rotation restriction receiving portion 64 is a drop guide surface 67 that expands outwardly from the flat surface 66 toward the outer peripheral edge portion 65 of the bottom surface of the mounting hole 61. ing. As shown in FIG. 3, the outer peripheral edge portion 65 on the bottom surface of the mounting hole 61 surrounds the entire outer periphery of the rotation restricting receiving portion 64, and one side in the radial direction from a region having a large radial dimension to a small region. Are gradually changed.

  Next, the lash adjuster 10 will be specifically described. As shown in FIG. 2, the lash adjuster 10 includes an end-cylindrical outer housing 12 and an inner housing 13 that is inserted into the outer housing 12. The inner housing 13 includes two members, an end-cylinder outer plunger 14 that can slide on the inner peripheral surface of the outer housing 12, and an end-cylinder inner plunger 15 that is inserted into the outer plunger 14. ing.

  The outer housing 12 is a casing of a size that can be fitted in the mounting hole 61 of the cylinder head 60, and includes a disk-shaped end wall 16 and a cylindrical peripheral wall 17 that extends from the outer periphery of the end wall 16. . The end wall 16 is disposed in contact with the bottom surface of the mounting hole 61 in a state where the outer housing 12 is inserted into the mounting hole 61.

  As shown in FIGS. 2 and 3, a rotation restricting portion 18 projects from the end face of the end wall 16. The rotation restricting portion 18 has a flat trapezoidal shape with a circular cross section, and is fitted into the rotation restricting receiving portion 64 with a slight gap. Specifically, the rotation restricting portion 18 is in detail in a wide area including the radial center C1 of the end surface of the end wall 16 (same as the radial center C1 of the bottom surface of the mounting hole 61) on the end surface of the end wall 16. Are provided in most of the half or more of the bottom surface of the end wall 16 except for the outer peripheral edge 19. As shown in FIG. 3, the radial center C <b> 2 of the cross section of the rotation restricting portion 18 does not coincide with the radial center C <b> 1 of the end face of the end wall 16, and is positioned on the radial line of the end face of the end wall 16. That is, the rotation restricting portion 18 has a circular cross section that is eccentric to the end face of the end wall 16.

  The protruding end surface of the rotation restricting portion 18 is a flat surface 21 having no irregularities along a direction orthogonal to the axial direction of the lash adjuster 10 (the same as the sliding direction of the inner housing 13), and has a circular outer peripheral contour shape. Yes. Further, the outer peripheral surface of the rotation restricting portion 18 is a sliding inclined surface 22 that expands outward in a tapered shape from the flat surface 21 toward the outer peripheral edge portion 19 of the end surface of the end wall 16. The sliding slope 22 is slidable on the drop guide surface 67 of the rotation restriction receiving portion 64 and has substantially the same inclination angle as the drop guide surface 67 with respect to the axial direction. The outer peripheral edge portion 19 of the end face of the end wall 16 surrounds the entire outer periphery of the rotation restricting portion 18 and is arranged so as to gradually change from one region having a large radial dimension to one having a small radial size. Yes.

  As shown in FIG. 2, the protrusion dimension L <b> 1 of the rotation restricting portion 18 is larger than the depth dimension L <b> 2 of the rotation restricting receiving portion 64. For this reason, when the rotation restricting portion 18 is received by the rotation restricting receiving portion 64, the flat surface 21 of the rotation restricting portion 18 is in contact with and supported by the flat surface 66 of the rotation restricting receiving portion 64. Furthermore, the protrusion dimension L1 of the rotation restricting portion 18 is set to be smaller than the axial stroke L3 in which the inner housing 13 slides with respect to the outer housing 12. Therefore, even if the rotation restricting portion 18 is not received by the rotation restricting receiving portion 64 and is supported by the outer peripheral edge portion 65 on the bottom surface of the mounting hole 61, the inner housing 13 can slide in the axial direction. It becomes.

  In the case of the first embodiment, the rotation restricting portion 18 is formed, for example, by removing a portion corresponding to the outer peripheral edge portion 19 on the end face of the end wall 16 by rolling or cutting. For this reason, the manufacture of the lash adjuster 10 is not particularly difficult due to the presence of the rotation restricting portion 18.

  The peripheral wall 17 is provided with an oil supply hole 23 at a position near the end wall 16 disposed on the upper side in a state where the outer housing 12 is inserted into the mounting hole 61. The oil supply hole 23 has a circular cross section and is configured to penetrate the peripheral wall 17 in the thickness direction. An annular recess 24 is provided at a position near the end wall 16 of the peripheral wall 17, and an oil supply hole 23 is opened in the inner surface of the annular recess 24. The annular recess 24 faces the peripheral surface of the mounting hole 61 and communicates with the oil passage 63.

  The outer plunger 14 includes a solid support portion 11 having a substantially hemispherical top surface and a cylindrical surrounding wall 25 extending from the outer periphery of the support portion 11. In a state where the inner housing 13 is inserted into the outer housing 12, the support portion 11 protrudes outward from the opening end of the peripheral wall 17, and the surrounding wall 25 is inserted into the inner peripheral surface of the peripheral wall 17 so as to be slidable in the axial direction and the peripheral direction. Is done. An oil passage 26 is provided between the end edge of the surrounding wall 25 and the end wall 16 so as to be cut out. An annular recess 27 is provided on the outer peripheral surface on the end side of the surrounding wall 25, and the annular recess 27 and the oil passage 26 are arranged in communication with the oil supply hole 23. Further, the top surface of the support portion 11 is a sliding area where the end of the rocker arm 80 slides.

  The inner plunger 15 includes a disc-shaped back wall 28 and a cylindrical tube wall 29 extending from the outer periphery of the back wall 28. When the inner plunger 15 is inserted into the outer plunger 14, the back wall 28 is arranged to face the support portion 11, and the cylindrical wall 29 is inserted into the inner peripheral surface of the surrounding wall 25 so as to be slidable in the axial direction and the circumferential direction. It has come to be. In the outer housing 12, an inner space surrounded by the back wall 28, the support portion 11, and the cylindrical wall 29 is configured as a high pressure chamber 31. The inside of the inner plunger 15 is configured as a reservoir chamber 32 (low pressure chamber) partitioned by a back wall 28 and a cylindrical wall 29.

  The opening end of the cylindrical wall 29 includes a portion that abuts on the end wall 16 of the outer housing 12 and a concave notch 33 that is spaced from the end wall 16. Further, the cylindrical wall 29 is provided with an oil hole 34 having a circular cross section penetrating in the thickness direction. The oil hole 34 opens in the inner surface of the annular groove 35 provided around the cylindrical wall 29.

  A valve hole 36 having a circular cross section is provided in the center of the back wall 28 so as to penetrate in the thickness direction. A spherical valve element 37 is accommodated in the high pressure chamber 31. The valve body 37 is received by a cage-like retainer 38 and is urged by a first spring 39 in a direction to close the valve hole 36. Further, in the high pressure chamber 31, a second spring 41 is disposed between the stepped portion formed on the inner surface of the support portion 11 and the retainer 38. The inner plunger 15 and the outer plunger 14 are biased in a direction away from each other by the second spring 41.

Next, the function and effect of the first embodiment will be described.
When the lash adjuster 10 is assembled, the outer housing 12 is inserted into the mounting hole 61 of the cylinder head 60. At this time, if the rotation restricting portion 18 of the outer housing 12 is in a position where the rotation restricting receiving portion 64 of the cylinder head 60 can be fitted, the rotation restricting portion 18 is received and fitted into the rotation restricting receiving portion 64. As a result, the flat surfaces 21 and 66 of the rotation restricting portion 18 and the rotation restricting receiving portion 64 come into contact with each other in a substantially surface contact state, and a pressing force is applied from the rocker arm 80 side. Is maintained (see FIGS. 1 and 2). Since the rotation restricting portion 18 is received by the rotation restricting receiving portion 64 in this manner, the lash adjuster 10 is substantially positioned in the rotation restricting state in the circumferential direction with respect to the cylinder head 60, and the oil supply hole 23 of the outer housing 12 is always directed upward. It arrange | positions so that it may open to.

  Here, the hydraulic fluid flowing through the oil passage 63 of the cylinder head 60 is stored in the reservoir chamber 32 through the annular recess 24, the oil supply hole 23, the annular recess 27, the oil passage 26, and the notch 33, and further, the valve hole The high pressure chamber 31 is filled through 36. When a pressing force is applied to the support portion 11 of the outer plunger 14 from the rocker arm 80 side, the valve body 37 closes the valve hole 36 to seal the high pressure chamber 31, and the support portion 11 is substantially constant by the hydraulic pressure of the high pressure chamber 31. Is maintained at the height position. When the pressing force from the rocker arm 80 side decreases due to the rotation of the cam 90, the volume of the high pressure chamber 31 increases, the outer plunger 14 slides on the inner peripheral surface of the outer housing 12, and the support portion 11 opens the outer housing 12. It becomes a state protruding from the end. At the same time, the valve body 37 moves away from the valve hole 36 against the spring force of the first spring 39, and hydraulic oil flows from the reservoir chamber 32 through the valve hole 36 into the high pressure chamber 31, and the high pressure chamber 31 is filled with hydraulic oil. It is. Thereafter, when the movement of the outer plunger 14 stops, the valve element 37 is urged by the spring force of the first spring 39 to close the valve hole 36 and the high-pressure chamber 31 is sealed. Thus, when the outer plunger 14 slides in the axial direction with respect to the outer housing 12, the support position of the support portion 11 with respect to the rocker arm 80 varies, and the valve clearance is adjusted appropriately.

  By the way, if the oil supply hole 23 of the outer housing 12 is opened downward, there is a concern that the hydraulic oil stored in the reservoir chamber 32 leaks out from the oil supply hole 23 when the engine is stopped. However, in the case of the first embodiment, when the rotation restricting portion 18 is received by the rotation restricting receiving portion 64, the rotation around the axis of the lash adjuster 10 in the attachment hole 61 is restricted, so that the oil supply hole 23 is inside the reservoir chamber 32. The state located above the oil level of the hydraulic oil is ensured. For this reason, the situation where the hydraulic oil in the reservoir chamber 32 leaks can be prevented.

  By the way, when the outer housing 12 is inserted into the mounting hole 61 of the cylinder head 60, the rotation restricting portion 18 is displaced from the rotation restricting receiving portion 64 and is supported by the outer peripheral edge portion 65 on the bottom surface of the attaching hole 61. The rotation restriction receiving portion 64 may not be received. In that case, when the lash adjuster 10 is operated, the outer housing 12 rotates around the axis in the mounting hole 61, so that the sliding inclined surface 22 of the rotation restricting portion 18 corresponds to the drop guide surface 67 of the rotation restricting receiving portion 64. At the position, the sliding inclined surface 22 drops and slides along the guiding surface 67 under the pressing force from the rocker arm 80 side, so that the rotation restricting portion 18 is dropped to the flat surface 66 side of the rotation restricting receiving portion 64. Fit. Accordingly, it is possible to ensure that the flat surfaces 21 and 66 of the rotation restricting portion 18 and the rotation restricting receiving portion 64 are in contact with each other.

  As described above, according to the first embodiment, since the rotation restricting portion 18 is received by the rotation restricting receiving portion 64, the rotation around the axis of the outer housing 12 in the attachment hole 61 is restricted. The oil supply hole 23 can be positioned at a position where the hydraulic oil in the chamber 32 does not leak. As a result, sufficient hydraulic oil can be stored in the reservoir chamber 32. In this case, since the rotation restricting portion 18 is integrally provided on the end surface of the end wall 16 of the outer housing 12, the number of parts can be reduced. Further, since it is not necessary to provide a hole for attaching the rotation restricting portion 18 to the end wall 16 of the outer housing 12, it is possible to cope with a small lash adjuster 10 having a thin end wall 16.

  Further, since the rotation restriction receiving part 64 is recessed in the bottom surface of the mounting hole 61, the manufacture of the cylinder head 60 is not particularly difficult due to the presence of the rotation restriction receiving part 64. Further, since the rotation restricting portion 18 protrudes from the end surface of the end wall 16 of the outer housing 12, the strength of the end wall 16 of the outer housing 12 can be ensured.

  Further, the rotation restriction receiving portion 64 is in a region including the radial center C1 of the bottom surface of the mounting hole 61, and the radial center (center when viewed from the opening side of the mounting hole 61) is the bottom surface of the mounting hole 61. The outer housing 12 is provided with a drop guide surface 67 which is provided at a position eccentric from the center C1 in the radial direction and further expands toward the outer periphery of the mounting hole 61 from the flat surface 66 which is the inner surface. Even when the rotation restricting portion 18 is not in a position where it can be fitted to the rotation restricting receiving portion 64 when inserted into the attachment hole 61 of the head 60, the outer housing 12 subsequently rotates within the attachment hole 61. The rotation restricting portion 18 is dropped into the rotation restricting receiving portion 64 along the drop guide surface 67. Therefore, the rotation restricting portion 18 can be fitted into the rotation restricting receiving portion 64 to secure a state where the rotation of the outer housing 12 within the attachment hole 61 is restricted.

  Further, the back surface of the rotation restriction receiving portion 64 and the protruding end face of the rotation restriction portion 18 are flat surfaces 21 and 66, and the protrusion dimension L1 of the rotation restriction portion 18 is made larger than the depth dimension L2 of the rotation restriction receiving portion 64. When the rotation restricting portion 18 is received by the rotation restricting receiving portion 64, the flat surfaces 21 and 66 of the rotation restricting receiving portion 64 and the rotation restricting portion 18 come into contact with each other. The outer housing 12 is stably held. Further, it is possible to prevent the bottom surface of the mounting hole 61 from being damaged due to interference with the rotation restricting portion 18. Furthermore, the depth dimension L2 of the rotation restriction receiving part 64 can be suppressed, and the fitting dimension between the rotation restriction part 18 and the rotation restriction receiving part 64 can be reduced as a whole.

<Example 2>
FIG. 4 shows a main part of the second embodiment of the present invention. In the case of the second embodiment, the structures of the rotation restriction receiving portion 64A and the rotation restriction portion 18A are different from those of the first embodiment. The rotation restriction receiving portion 64A is recessed in the entire bottom surface of the mounting hole 61 of the cylinder head 60A, and unlike the first embodiment, the outer peripheral edge portion 65 is not left on the bottom surface of the mounting hole 61. Specifically, the rotation restricting receiving portion 64 </ b> A is a drop guide surface that greatly expands in a tapered shape from the back surface that becomes the flat surface 66 along the direction orthogonal to the axial direction of the mounting hole 61 to the outer peripheral edge of the mounting hole 61. 67A. The rotation restriction receiving portion 64A is provided in a region including the radial center C1 of the bottom surface of the attachment hole 61, and the radial center of the rotation restriction reception portion 64A is eccentric from the radial center C1 of the attachment hole 61. Same as 1.

  Further, the rotation restricting portion 18A protrudes from the entire end surface of the end wall 16 of the outer housing 12, and unlike the first embodiment, the outer peripheral edge portion 19 is not left on the end surface of the end wall 16. Specifically, the rotation restricting portion 18A slides greatly expanding in a taper shape from the protruding end surface that becomes the flat surface 21 along the direction orthogonal to the axial direction of the lash adjuster 10A to the outer peripheral edge of the end surface of the end wall 16. It has a slope 22A. The rotation restricting portion 18A is provided in a region including the radial center C1 of the end face of the end wall 16, the radial center C2 of the rotation restricting portion 18A is eccentric from the radial center C1 of the end face of the end wall 16, and the rotation restricting portion The point that the protruding dimension L1 of 18A is larger than the depth dimension L2 of the rotation restricting receiving portion 64A and smaller than the moving stroke L3 of the inner housing 13 is the same as in the first embodiment.

  According to the second embodiment, when the lash adjuster 10A is assembled, the rotation restricting portion 18A is directly dropped into the rotation restricting receiving portion 64A without being supported by the outer peripheral edge portion 65 on the bottom surface of the mounting hole 61. The state where 18A can be received by the rotation restriction receiving portion 64A can be ensured.

<Other embodiments>
Other embodiments will be briefly described below.
(1) In the lash adjuster of the present invention, the outer housing is a cylindrical body, the inner housing is a single plunger (a single member that is not divided into an outer plunger and an inner plunger), and a reservoir chamber is provided in the plunger. A structure may also be adopted in which a high pressure chamber is defined between the body and the plunger, a valve hole is provided in the inner wall of the plunger, and the top of the plunger supports the rocker arm.
(2) The rotation restriction receiving portion and the rotation restriction portion may have an oval or elliptical cross-sectional shape, or may have a shape other than a circle, for example, a polygonal cross-sectional shape such as a triangle or a quadrangle. Good.
(3) The lash adjuster may be arranged along the vertical direction (gravity direction) as a whole in the mounting hole of the cylinder head.
(4) Contrary to the first and second embodiments, the rotation restriction receiving portion may be provided to protrude from the bottom surface of the mounting hole, and the rotation restriction portion may be provided to be recessed at the end surface of the outer housing.
(5) The drop guide surface and the sliding slope may be configured to expand outward in a curved shape.

DESCRIPTION OF SYMBOLS 10, 10A ... Rush adjuster 12 ... Outer housing 13 ... Inner housing 16 ... End wall 18, 18A ... Rotation restricting part 21 ... Flat surface of rotation restricting part 22 ... Sliding slope 23 ... Oil supply hole 31 ... High pressure chamber 32 ... Reservoir chamber 60, 60A ... Cylinder head 61 ... Mounting hole 64, 64A ... Rotation restriction receiving portion 66 ... Flat surface of rotation restriction receiving portion 67 ... Drop-in guiding surface

Claims (4)

A cylindrical outer housing with an end that is inserted into a bottomed mounting hole with a circular cross section provided in the cylinder head and has an oil supply hole;
An inner housing that is inserted into the outer housing and has a reservoir chamber that communicates with the oil supply hole, and that slides within the outer housing in response to the pressure of a high-pressure chamber that communicates with the reservoir chamber via a valve portion. The assembly structure of the lash adjuster provided,
A rotation restriction receiving portion is provided on the bottom surface of the mounting hole of the cylinder head,
A lash adjuster is integrally provided on an end surface of the outer housing, and a rotation restricting portion that is received by the rotation restricting receiving portion and restricts the rotation of the outer housing around the axis in the mounting hole. Assembly structure.   The rotation restriction receiving portion is recessed on the bottom surface of the mounting hole, the rotation restriction portion is protruded from an end surface of the outer housing, and the rotation restriction portion is fitted into the rotation restriction receiving portion. The assembly structure of a lash adjuster according to claim 1.   The rotation restriction receiving portion includes a center in the radial direction of the mounting hole, and the center when viewed from the opening side of the mounting hole is provided at a position eccentric from the radial center of the mounting hole. The assembly structure of the lash adjuster according to claim 2, further comprising a drop guide surface that expands from the back surface toward the outer periphery of the mounting hole.   The back surface of the rotation restriction receiving part and the protruding end surface of the rotation restriction part are both flat surfaces, and the protrusion dimension of the rotation restriction part is larger than the depth dimension of the rotation restriction receiving part. 4. The assembly structure of a lash adjuster according to claim 3, wherein when the restricting portion is received by the rotation restricting receiving portion, the flat surfaces of the rotation restricting receiving portion and the rotation restricting portion abut each other. .

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