JP5973243B2 - Rocker arm with built-in lash adjuster - Google Patents

Description

  The present invention relates to a rocker arm incorporating a lash adjuster.

  A rocker arm with a built-in lash adjuster described in Patent Document 1 includes a rocker arm body that is swingably supported by a shaft on a cylinder head, and a lash that is inserted into a bottomed mounting hole that is recessed at an end of the rocker arm body. And an adjuster. The lash adjuster is housed in a high-pressure chamber and a partition that partitions a low-pressure chamber (hydraulic passage) defined on the bottom side of the mounting hole and a high-pressure chamber (oil chamber) defined on the opening side of the mounting hole. And a valve body. The partition has a valve hole communicating with the high pressure chamber and the low pressure chamber. The valve body is always urged by the return spring to close the valve hole, and operates to open the valve hole when the internal pressure of the low pressure chamber becomes higher than the internal pressure of the high pressure chamber.

  The end of the lash adjuster is in contact with the valve, and the end of the lash adjuster presses the valve as the rocker arm body swings, so that the valve is opened and closed at a predetermined timing. In this case, when the volume of the high pressure chamber increases or decreases in accordance with the opening / closing operation of the valve body, the end position of the lash adjuster fluctuates and the valve clearance is automatically adjusted.

JP 10-73010 A

  By the way, when assembling the lash adjuster to the rocker arm main body, the valve body is normally closed by the return spring to increase the volume of the high-pressure chamber, so that the oil filled in the high-pressure chamber is leaked and the volume is reduced. Work must be done. In this case, if the inside of the mounting hole is sealed, external pressure cannot be applied to the valve body to open the valve hole. Therefore, the end of the lash adjuster is pressed to apply compressive force to the high pressure chamber, and the lash adjuster The hydraulic pressure in the high-pressure chamber must be gradually released through the gap between the outer peripheral surface and the inner peripheral surface of the mounting hole. If it does so, there exists a problem that the compression operation | work of a high pressure chamber takes time and a work burden is also large.

  In view of this, for example, a rocker arm body is provided with a through hole that opens to the outer surface and the bottom surface of the mounting hole, a jig is inserted into the low pressure chamber from the through hole, and the tip of the jig is pressed against the valve body to It is also possible to return the oil in the high pressure chamber to the low pressure chamber side through the valve hole by opening the valve hole by separating the body from the valve hole. However, in this case, there is a problem that oil is discharged from the through hole to the outside during use. On the other hand, it is possible to close the through-hole with a stopper and prevent oil leakage. However, if air is generated inside the high-pressure chamber and low-pressure chamber during use, remove the stopper and remove the air. Therefore, there is a problem in that it is necessary to make the stopper plug detachable and the work load required to remove the stopper stopper is large.

  The present invention has been completed based on the above situation, and an object thereof is to improve the assembly workability of the lash adjuster.

The rocker arm with a built-in lash adjuster of the present invention includes a lash adjuster and a rocker arm body having a bottomed mounting hole into which the lash adjuster is inserted, and the rocker arm body is opened on an outer surface thereof and a bottom surface of the mounting hole. The lash adjuster partitions the space between the low pressure chamber located on the bottom side of the mounting hole and the high pressure chamber located on the opening side of the mounting hole, and places the valve hole at a position facing the through hole. And a valve body accommodated in the high-pressure chamber and capable of opening and closing the valve hole in response to an internal pressure difference between the high-pressure chamber and the low-pressure chamber. And a pusher that is movable between the valve closing position and a biasing member that biases the pusher to the valve closing position, and the pusher includes a lid portion that is located on the bottom side of the mounting hole; Above Tip protrudes from part has a entrance permitted pressing portion within the valve bore, in the closed position, the lid body portion formed on the lid by the biasing member to close the through hole orientation The valve body maintains a state in which the valve hole is closed, and when the lash adjuster is assembled, the lid is pressed by a jig inserted into the through hole, and the pusher is The valve member is moved to the valve opening position side against the urging force of the urging member, and at the valve opening position, the valve body is separated from the valve hole by being pressed against the tip of the pressing portion. The lid portion has a guide portion, and in the process of moving the pusher, the guide portion regulates the inclination of the pusher by sliding on the inner peripheral surface of the low pressure chamber. Further, the guide portion is A diameter-enlarging portion that projects in a radial direction from the lid body portion, and a guide body portion that is formed on a peripheral edge of the diameter-expanding portion and slides on an inner peripheral surface of the low-pressure chamber. It is characterized in that the oil through hole is formed through .

When the lash adjuster is assembled, when the valve hole is closed by the valve body and the volume of the high-pressure chamber is increased, if the jig is inserted into the through hole of the rocker arm body, the lid is pressed by the jig. The pusher is moved to the valve opening position. At the valve opening position, the valve body is pressed by the tip of the pressing portion and separated from the valve hole, so that the valve hole is opened. It is smoothly transferred to the low pressure chamber side through the hole. As a result, the volume of the high pressure chamber is reduced. At this time, it is not necessary to compress the high pressure chamber, and the workability of assembling the lash adjuster is improved. Also, during use, the through hole is closed by the lid portion urged by the urging member, and the pusher is maintained in the valve-closed position. Sex is also secured. Moreover, when air is mixed into the liquid of the lash adjuster, air can be easily removed by a simple operation of inserting a jig into the through hole and bringing the pusher to the valve opening position.
Further, the lid portion has a guide portion, and in the process of moving the pusher, the guide portion regulates the inclination of the pusher by sliding on the inner peripheral surface of the low pressure chamber. As a result, a dedicated guide structure for guiding the movement of the pusher is not required, and the configuration can be simplified.

FIG. 5 is a cross-sectional view of the main part when the pusher is in the valve closing position in the lash adjuster built-in type rocker arm according to the first embodiment of the present invention. It is principal part sectional drawing when a cover part is pressed with a jig | tool and a pusher reached the valve opening position. It is an expanded sectional view showing the state where a through hole was closed with a lid. It is a top view of a pusher. It is sectional drawing of a valve operating apparatus containing the lash adjuster built-in type rocker arm. FIG. 4 is a view corresponding to FIG. 3 of the rocker arm with a built-in lash adjuster according to the second embodiment.

Preferred embodiments of the present invention are as follows.
The lash adjuster includes an outer cylinder member that can be fitted into the mounting hole, and an inner cylinder member that is inserted into the outer cylinder member, and the partition is formed at a closed end of the inner cylinder member, A low pressure chamber is formed inside the inner cylinder member, and the high pressure chamber is formed between the partition wall in the outer cylinder member, and an open end of the mounting hole and the inner cylinder member A plate is disposed between the plate and the plate, and a jig insertion hole is formed in the plate so as to communicate with the through hole and into which the jig can be inserted. The plate can come into surface contact with the bottom surface of the mounting hole. A first plate surface and a second plate surface which is located on the opposite side of the first plate surface and on which the lid portion can contact. If the rocker arm body is made of a softer material than the inner cylinder member, the opening end of the inner cylinder member is in contact with the bottom surface of the mounting hole. May be hurt by. In that respect, according to the above configuration, the plate is disposed between the open end of the inner cylinder member and the bottom surface of the mounting hole, and the first plate surface of the plate can be brought into surface contact with the bottom surface of the mounting hole. The situation where the bottom surface of the hole is damaged is avoided. Further, since the lid portion can come into contact with the second plate surface of the plate, the jig insertion hole is closed by the lid portion. At that time, by devising the contact shape of the lid portion with the second plate surface of the plate, the inside of the jig insertion hole can be liquid-tightly sealed to improve the sealing performance.

<Example 1>
A first embodiment of the present invention will be described with reference to FIGS.
The valve gear shown in FIG. 5 includes a rocker arm 10 incorporating a lash adjuster 30, a valve 80, and a cam 90.

  As shown in FIG. 5, the rocker arm 10 includes a rocker arm body 11 that is swingably supported by the shaft 20. Of the both ends of the rocker arm body 11 across the shaft 20, a bottomed mounting hole 12 into which a lash adjuster 30 is fitted and inserted is formed at one end, and the roller 13 is rotatable at the other end. It is attached. The cam 90 has a cam surface 91 that can rotate around an axis parallel to the shaft 20 and can come into contact with the roller 13. The valve 80 is connected to the rocker arm 10 via the lash adjuster 30 and is always urged by the urging force of the valve spring 81 to close the intake or exhaust port.

  The mounting hole 12 has a circular cross section and opens downward. As shown in FIG. 1, the mounting hole 12 has a plate accommodating portion 14 and a stroke restricting portion 15 on the bottom side (upper side). The plate housing portion 14 has a flat bottom surface 12 </ b> A that has a smaller diameter than the opening side of the mounting hole 12 and extends in a direction orthogonal to the depth direction of the mounting hole 12. A plate 60 to be described later is accommodated in the plate accommodating portion 14. The stroke restricting portion 15 has first and second steps 15 </ b> A and 15 </ b> B that restrict the stroke range of the lash adjuster 30 at both ends in the depth direction of the mounting hole 12. 15 A of 1st level | step differences are arrange | positioned in the position connected with the plate accommodating part 14, and the 2nd level | step difference 15B is arrange | positioned in the position of the opening side (lower side) of the attachment hole 12 rather than 15 A of 1st steps.

  An oil passage 16 is formed at one end of the rocker arm body 11. The oil passage 16 is configured to extend obliquely across one end of the rocker arm main body 11, one end is opened in the inner peripheral surface of the mounting hole 12, and the other end is a central oil passage (not shown) of the shaft 20. It is open. The lash adjuster 30 is supplied with oil introduced into the mounting hole 12 from the central oil passage through the oil passage 16.

  A through hole 17 is formed at one end of the rocker arm body 11. The through-hole 17 has a smaller diameter than the mounting hole 12 and extends vertically (in the depth direction of the mounting hole 12), one end opening on the top surface of the rocker arm body 11, and the other end on the bottom surface 12 </ b> A of the mounting hole 12. It is open. A jig 100 described later is inserted into the through hole 17, and the jig 100 can enter the mounting hole 12 through the through hole 17.

  As shown in FIG. 1, the lash adjuster 30 includes an outer cylinder member 31 and an inner cylinder member 32. The outer cylinder member 31 includes a hemispherical head 33 and a cylindrical peripheral wall portion 34 that rises from the periphery of the head 33. The outer cylinder member 31 is slidably fitted into the mounting hole 12, and in the fitted state, the outer peripheral surface of the peripheral wall portion 34 is disposed so as to substantially contact the inner peripheral surface of the mounting hole 12. 33 is arranged to protrude downward from the opening of the mounting hole 12. The head portion 33 has a convex curved surface 35 that can come into contact with the upper end portion of the valve 80.

  An annular groove 36 is formed on the outer peripheral surface of the upper end portion of the peripheral wall portion 34 (the portion located on the bottom side of the mounting hole 12 when assembled). An end ring stopper ring 37 is fitted into the annular groove 36. When the lash adjuster 30 is fitted in the mounting hole 12, the stopper ring 37 is arranged in the stroke restricting portion 15. Further, when the stopper ring 37 abuts on the first step 15A, the further rise of the outer cylinder member 31 is restricted, and when the stopper ring 37 abuts on the second step 15B, it exceeds that of the outer cylinder member 31. Is now regulated.

  The inner cylinder member 32 includes a disk-shaped partition wall 38 and a cylindrical inner peripheral wall 39 that rises from the periphery of the partition wall 38. The inner cylinder member 32 is fitted into the outer cylinder member 31, and in the fitted state, the outer peripheral surface of the inner peripheral wall 39 is disposed so as to substantially contact the inner peripheral surface of the peripheral wall portion 34, and the partition wall 38 is located on the head. It is arranged to be opposed to each other with an interval (corresponding to the height of a high-pressure chamber 44 described later) with respect to the end face of 33. A communication hole 40 is formed by cutting out the opening end of the inner peripheral wall 39, and a return hole 41 is formed below the communication hole 40.

  Further, a valve hole 42 is formed in the center of the partition wall 38 at a position facing the through hole 17 coaxially. The inside of the inner cylinder member 32 is a low pressure chamber 43, and the inside of the outer cylinder member 31 near the head 33 is a high pressure chamber 44 partitioned from the low pressure chamber 43 by a partition wall 38. The upper end of the valve hole 42 opens into the low pressure chamber 43, and the lower end of the valve hole 42 opens into the high pressure chamber 44. In the low-pressure chamber 43, the upper end (opening end) of the inner cylinder member 32 is closed by a lid portion 51 and a plate 60 of the pusher 50, which will be described later, so that the low-pressure chamber 43 can communicate with the oil passage 16 only through the communication hole 40. Maintained.

  In the high-pressure chamber 44, a spherical valve body 45 is arranged in a state of being biased in a direction to close the valve hole 42 by a first spring 46 made of a compression coil spring. The valve body 45 is accommodated in a bowl-shaped retainer 47, and the retainer 47 is pressed against and fixed to the partition wall 38 while being urged by a second spring 48 formed of a compression coil spring. Further, the second spring 48 is biased in a direction to increase the volume of the high pressure chamber 44. The oil is stored in the low pressure chamber 43 from the central oil passage through the oil passage 16 and the communication hole 40 and further filled into the high pressure chamber 44 through the valve hole 42.

  Here, when the roller 13 slides on the cam surface 91 by the rotation of the cam 90, the rocker arm body 11 swings and the other end is lifted, and one end presses the upper end of the valve 80 via the lash adjuster 30. . At this time, the valve body 45 abuts against the partition wall 38 and closes the valve hole 42 to seal the inside of the high pressure chamber 44, and the outer cylinder member 31 is stopped by the hydraulic pressure in the high pressure chamber 44. Then, the valve 80 is moved in the valve opening direction against the urging force of the valve spring 81. While the valve 80 is open, the oil in the high pressure chamber 44 leaks through the gap between the outer cylinder member 31 and the inner cylinder member 32 due to the increase in the hydraulic pressure in the high pressure chamber 44, and the leaked oil Is returned to the low pressure chamber 43 through the return hole 41.

  After the valve 80 is opened for a predetermined time, when the other end of the rocker arm main body 11 is lowered by further rotation of the cam 90, the rocker arm main body 11 swings in the reverse direction, and the valve 80 is closed by the urging force of the valve spring 81. To do. Then, the urging force from the valve spring 81 does not substantially act on the lash adjuster 30, and the volume of the high pressure chamber 44 increases with the follow-up movement of the outer cylinder member 31. According to the difference, the valve body 45 is separated from the valve hole 42 and opens the valve hole 42. Simultaneously with the opening of the valve hole 42, the oil flows from the low pressure chamber 43 through the valve hole 42 into the high pressure chamber 44, and the state in which the oil is filled in the high pressure chamber 44 is maintained. When the outer cylinder member 31 stops, the valve body 45 abuts against the partition wall 38 by the urging force of the first spring 46, the valve hole 42 is closed, and the high-pressure chamber 44 is again sealed.

  As shown in FIG. 1, a pusher 50 and a spring material 70 are accommodated in the low pressure chamber 43 of the inner cylinder member 32. A plate 60 is accommodated in the plate accommodating portion 14 of the low-pressure chamber 43 (between the open end of the cylindrical member 32 and the bottom surface 12A of the mounting hole 12).

  The plate 60 has a disk shape, and a jig insertion hole 61 is formed in the center portion so as to penetrate vertically (in the depth direction of the mounting hole 12). When the plate 60 is accommodated in the plate accommodating portion 14, the jig insertion hole 61 communicates coaxially with the through-hole 17 and is disposed at a position facing the valve hole 42 with the low-pressure chamber 43 interposed therebetween. The central part of the plate 60 surrounds the jig insertion hole 61 and is formed thicker than the peripheral part.

  Further, the plate 60 has a first plate surface 62 that can be brought into contact with the bottom surface 12 </ b> A of the mounting hole 12 in a surface contact state, and a second plate surface 63 located on the opposite side of the first plate surface 62. . The second plate surface 63 includes a contact surface 64 positioned at the opening edge of the jig insertion hole 61 and a peripheral surface 65 positioned at the peripheral edge of the plate 60 and dropped from the contact surface 64 by one step. Yes. The contact surface 64 is a flat surface along a direction orthogonal to the extending direction of the jig insertion hole 61 so that a lid 51 described later can contact. On the other hand, the peripheral surface 65 is a portion that defines the communication hole 40 of the inner cylinder member 32. The plate 60 is adjusted to have a hardness equivalent to that of the lash adjuster 30 and harder than the rocker arm body 11 by carburizing and quenching.

  The pusher 50 is integrally composed of a lid part 51 and a pressing part 52 protruding from the center of the lid part 51. The lid 51 has a columnar lid body 53 located at the center and a cylindrical guide 54 located at the peripheral edge. As shown in FIG. 3, the lid main body 53 has a flat seal surface 55 that can come into surface contact with the contact surface 64, and the seal surface 55 covers the opening of the jig insertion hole 61. The inside of 61 is liquid-tightly sealed.

  As shown in FIG. 1, the guide portion 54 has a diameter-expanding portion 56 that projects radially from the periphery of the lower end portion of the lid body portion 53, and a guide body portion 57 that protrudes downward from the periphery of the diameter-expansion portion 56. doing. As shown in FIG. 4, the enlarged diameter portion 56 is formed with a plurality of oil through holes 58 penetrating in the circumferential direction. The oil in the low pressure chamber 43 can flow from the pusher 59 to the low pressure chamber 43 side and the plate 60 side through the oil passage hole 58. Further, the outer peripheral surface of the guide main body portion 57 can slide on the inner peripheral surface of the inner cylinder member 32.

  As shown in FIG. 1, the pressing portion 52 has a rod-like shape extending substantially along the central axis of the lash adjuster 30 and is disposed inside the low-pressure chamber 43 so as to be positioned inside the spring material 70. It has become. The tip of the pressing portion 52 enters the valve hole 42 and faces the valve body 45 from above.

  The spring material 70 is a compression coil spring that is concentric with the first and second springs 46 and 48, and has an upper end that is in contact with the lower surface of the enlarged diameter portion 56 inside the guide main body portion 57, and a lower end that is on the upper surface of the partition wall 38. It is in contact. The pusher 50 is always urged upward by the spring material 70. For this reason, the seal surface 55 of the lid portion 51 can be kept pressed against the contact surface 64 of the plate 60.

  Here, the pusher 50 is movable in the axial direction (vertical direction) between the valve opening position and the valve closing position in the low pressure chamber 43. As shown in FIG. 1, the valve closing position is a normal use state, and the urging force of the spring material 70 causes the sealing surface 55 of the lid portion 51 to abut against the abutting surface 64 of the plate 60 and the pressing portion 52. The valve body 45 is in a state in which the valve body 45 closes the valve hole 42. On the other hand, as shown in FIG. 2, the valve opening position is a temporary state when the lash adjuster 30 is assembled, and the sealing surface 55 of the lid portion 51 is against the urging force of the spring material 70. This is a state in which the valve body 45 is moved away from the contact surface 64 and the tip of the pressing portion 52 is in contact with the valve body 45 from above, so that the valve body 45 opens the valve hole 42.

Next, a procedure for assembling the lash adjuster 30 to the rocker arm body 11 will be described.
The lash adjuster 30 before being assembled to the rocker arm body 11 is normally biased by the second spring 48 in a direction in which the volume of the high pressure chamber 44 increases, and the valve body 45 closes the valve hole 42 by the first spring 46. The head 33 of the outer cylinder member 31 protrudes greatly downward with respect to the inner cylinder member 32. That is, the high pressure chamber 44 is held in an expanded state.

  In this state, the plate 60 and the lash adjuster 30 are inserted into the mounting hole 12 of the rocker arm main body 11. As shown in FIG. 1, when the plate 60 and the lash adjuster 30 are inserted into the mounting hole 12, the first plate surface 62 of the plate 60 comes into contact with the bottom surface 12A of the mounting hole 12, and the through hole 17 and the jig are inserted. The hole 61 communicates coaxially, and the seal surface 55 of the lid portion 51 abuts against the abutment surface 64 of the plate 60 so that the pusher 50 is held in the valve closing position.

  Next, the rod-shaped jig 100 is inserted into the through-hole 17 from above. Further, as shown in FIG. 2, the jig 100 is inserted into the jig insertion hole 61 from the through hole 17, and the tip is brought into contact with the contact surface 64 of the lid portion 51 to push down the entire pusher 50 downward. When the lid 51 is separated from the plate 60 by the pressing force from the jig 100, the jig insertion hole 61 communicates with the low pressure chamber 43, and the tip of the pressing part 52 comes into contact with the valve body 45 from above, so that the valve body 45 is pushed down against the biasing force of the first spring 46. While the pusher 50 moves, the guide portion 54 slides on the inner peripheral surface of the inner cylinder member 32, so that the inclination of the pusher 50 and the axial deflection of the pressing portion 52 are restricted.

  Further, while the pusher 50 is lowered and held at the valve opening position, oil flows from the high pressure chamber 44 through the communication hole 40 to the low pressure chamber 43, and the volume of the high pressure chamber 44 is reduced by the outflow of oil. Further, while the pusher 50 is held at the valve open position, the air mixed into the oil in the lash adjuster 30 is released to the outside air through the through hole 17 and the jig insertion hole 61.

  After an appropriate amount of oil is transferred from the high pressure chamber 44 to the low pressure chamber 43, the jig 100 is pulled out from the through hole 17 and the jig insertion hole 61. Then, the pressing force from the jig 100 to the lid portion 51 is released, and the pusher 50 is raised by the urging force of the spring material 70 accordingly, so that the seal surface 55 of the lid portion 51 contacts the contact surface 64 of the plate 60. Touch. Further, the pressing force from the pressing portion 52 to the valve body 45 is also eliminated by pulling out the jig 100, and accordingly the valve body 45 is raised by the urging force of the first spring 46 and comes into contact with the partition wall 38, and the valve hole 42 is opened. close up. Thus, the pusher 50 is automatically moved from the valve opening position to the valve closing position when the jig 100 is pulled out. In the valve closing position, the head 33 of the lash adjuster 30 is adjusted to an appropriate height position. When the rocker arm 10 is used, the pusher 50 can maintain a state in which it is biased to the valve closing position by the spring material 70.

  As described above, according to the present embodiment, when the pusher 50 is pushed into the valve opening position by the jig 100, the valve body 45 is pushed by the pressing portion 52 to open the valve hole 42, and the oil is in the high pressure chamber. Since the fluid flows from 44 to the low pressure chamber 43 through the valve hole 42, the volume of the high pressure chamber 44 can be easily reduced without compressing the inside of the high pressure chamber 44 over time. Further, during use, the pusher 50 is maintained in the valve-closed position by the spring material 70, so that the communication state between the low-pressure chamber 43 and the through-hole 17 is cut off without passing through the stopper plug that closes the through-hole 17. The situation where oil leaks out from the hole 17 is avoided.

  Further, since the guide portion 54 for moving the pusher 50 is formed integrally with the lid portion 51, a dedicated guide structure is not required, and the configuration of the pusher 50 is simplified.

<Example 2>
FIG. 6 shows a second embodiment of the present invention. The second embodiment is the same as the first embodiment except that the shape of the lid body 53A is different from the lid body 53 of the first embodiment. Therefore, the description which overlaps with Example 1 is abbreviate | omitted.

  The lid main body portion 53A has a hemispherical shape protruding toward the jig insertion hole 61 of the rocker arm main body 11, and has a convex curved seal surface 55A. When the pusher 50A is in the valve closing position, the top of the lid main body 53 is inserted into the jig insertion hole 61 so that the opening edge of the jig insertion hole 61 is in contact with the seal surface 55A over the entire circumference. It has become.

  According to the second embodiment, since the lid main body 53A has the convex curved seal surface 55A, it is ensured that the opening edge of the jig insertion hole 61 is in contact with the seal surface 55A over the entire circumference. Further, the sealing performance at the valve closing position is further improved.

The present invention is not limited to the embodiments described with reference to the above description and drawings, and may be, for example, as follows.
(1) The plate may be omitted. In this case, the lid portion directly closes the through hole at the valve closing position.
(2) When the pusher is in the valve open position, the tip of the pressing portion may not enter the valve hole.
(3) The present invention provides a lash adjuster having a configuration as described in the prior art (Japanese Patent Laid-Open No. 10-73010) in which a partition wall is formed on an outer cylinder member and a low pressure chamber is defined on the bottom side of the mounting hole. It can also be applied to a built-in rocker arm.

DESCRIPTION OF SYMBOLS 10 ... Rocker arm 11 ... Rocker arm main body 12 ... Mounting hole 12A ... Bottom surface 17 ... Through-hole 30 ... Rush adjuster 31 ... Outer cylinder member 32 ... Inner cylinder member 38 ... Partition 42 ... Valve hole 43 ... Low pressure chamber 44 ... High pressure chamber 45 ... Valve Body 50 ... Pusher 51 ... Cover portion 52 ... Pressing portion 54 ... Guide portion 60 ... Plate 61 ... Jig insertion hole 62 ... First plate surface 63 ... Second plate surface 70 ... Spring material (biasing member)
100 ... Jig

Claims (2)

A lash adjuster, and a rocker arm body having a bottomed mounting hole into which the lash adjuster is inserted,
The rocker arm body has a through hole that opens to the outer surface thereof and the bottom surface of the mounting hole,
The lash adjuster partitions a partition between a low pressure chamber located on the bottom side of the mounting hole and a high pressure chamber located on the opening side of the mounting hole and has a valve hole at a position facing the through hole, and the high pressure chamber A valve body accommodated in a room and capable of opening and closing the valve hole in response to an internal pressure difference between the high pressure chamber and the low pressure chamber;
The low pressure chamber contains a pusher that can move between a valve opening position and a valve closing position, and a biasing member that biases the pusher to the valve closing position,
The pusher has a lid portion that is located on the bottom side of the mounting hole, and a pressing portion that protrudes from the lid portion and a tip portion can enter into the valve hole,
In the valve closing position, the lid body formed on the lid by the biasing member is biased in a direction to close the through hole, and the valve body maintains the state of closing the valve hole, and the lash When the adjuster is assembled, the lid is pressed by a jig inserted into the through hole, and the pusher is moved to the valve opening position side against the urging force of the urging member. In the position, the valve body is configured to open the valve hole apart from the valve hole by being pressed against the tip of the pressing part ,
And the lid part has a guide part, and in the moving process of the pusher, the guide part is configured to regulate the inclination of the pusher by sliding on the inner peripheral surface of the low-pressure chamber,
Further, the guide portion has a diameter-expanding portion that projects in a radial direction from the lid main-body portion, and a guide main-body portion that is formed on the periphery of the diameter-expanding portion and slides on the inner peripheral surface of the low-pressure chamber. A rocker arm with a built-in lash adjuster , wherein an oil passage hole is formed through the enlarged diameter portion . The lash adjuster includes an outer cylinder member that can be fitted into the mounting hole, and an inner cylinder member that is inserted into the outer cylinder member, and the partition is formed at a closed end of the inner cylinder member, A low-pressure chamber is formed inside the inner cylinder member, and the high-pressure chamber is formed between the partition and the inside of the outer cylinder member,
A plate is disposed between the bottom surface of the mounting hole and the opening end of the inner cylinder member, and the plate is formed with a jig insertion hole that allows the jig to be inserted in communication with the through hole. The plate has a first plate surface that can be brought into surface contact with the bottom surface of the mounting hole, and a second plate surface that is located on the opposite side of the first plate surface and can come into contact with the lid portion. The rocker arm with a built-in lash adjuster according to claim 1.

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