JP2013068207A - Lash adjuster in valve operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling of a lash adjuster for an end pivot type valve operating device.SOLUTION: A pivot member 27 and a screw rod 28 are assembled into a body 21. The male screw 29 on an outer periphery of the screw rod 28 is engaged with the female screw 22 on an inner periphery of the body 21 by screwing. A torsion coil spring 36 applying torque to the screw rod 28 is assembled into the tip of the body 21, and a cap 42 is fitted to the tip of the torsion coil spring 36. While the cap 42 is rotated and the torsion elasticity is applied to the torsion coil spring 36, the cap 42 is press-fitted to the inside of the tip of the body 21 to stop rotation of the screw rod 28. The screw rod 28 and pivot member 27 are kept inserted in the body 21 in an initial set state, to facilitate assembling into the valve gear. After assembling into the valve gear, the rotation stop of the screw rod 28 is released by cranking of an engine, and the pivot member 27 and screw rod 28 are set to an operation state by the elasticity of the torsion coil spring 36.

Description

  The present invention relates to a lash adjuster that automatically adjusts the valve clearance of a valve gear in an internal combustion engine.

  As described in Patent Document 1, a direct type that directly pushes down a valve stem by a cam and Patent Document 2 as a valve operating device that opens and closes an intake valve or an exhaust valve (hereinafter simply referred to as a valve) by rotation of a cam. As described in Japanese Patent Application Laid-Open No. H11-133260, there is an arm type in which a valve stem is pushed down by an arm.

  Here, there are a rocker arm type and a swing arm type (end pivot type) in the arm type valve operating device. In the rocker arm type valve operating device, as described in Patent Document 2, it is located above the cam. The arm is swingably supported around the provided rocker shaft, and one end of the arm is pushed up by the rotation of the cam, and the valve stem is pushed down at the other end of the arm to open the valve.

  On the other hand, in the swing arm type valve operating apparatus, as described in Patent Document 3, the end of the arm disposed below the cam is supported by a pivot, and the arm is centered on the pivot by the rotation of the cam. The valve is opened by pushing down the valve stem at the end on the swing side.

  In any of the above valve gears, the valve clearance is automatically adjusted by incorporating a lash adjuster.

  As the lash adjuster, a hydraulic type is known. However, since the hydraulic lash adjuster uses engine oil as the working oil, it is easily affected by changes in oil pressure due to engine speed, contamination and air bubbles mixed in the engine oil, and the structure is complex and easy to assemble. It takes time and is disadvantageous in terms of cost.

  In that respect, the mechanical lash adjusters described in Patent Documents 1 to 3 do not have the above-described problems and are advantageous for incorporation into a valve operating device.

  In the mechanical lash adjuster, a rotational force is applied to a clearance adjustment member such as an adjustment bolt or an adjustment screw by the elastic force of an elastic body, and the clearance adjustment member is moved in the axial direction by screw engagement of a male screw and a female screw. Therefore, when incorporating into the valve operating apparatus, it is necessary to push the clearance adjusting member in the axial direction against the elastic force of the elastic body and incorporate it into the valve operating apparatus in a contracted initial set state.

JP-A-11-62519 JP 2007-92668 A JP 2005-248912 A

  Here, in the lash adjuster described in Patent Document 1, an elastically deformable pin is inserted into a pin hole formed in a closed end plate of a guide cap and a pin hole provided in an adjustment bolt (clearance adjusting member). Therefore, in the lash adjuster described in Patent Document 2, an adjustment screw is attached by attaching a U-shaped holder to the end of the arm. Since it can be held in the initial set state in which is pushed, it is easy to assemble the lash adjuster to the valve gear.

  However, the lash adjuster for the end pivot type valve operating device described in Patent Document 3 does not include an initial setting mechanism that can hold the lash adjuster in a contracted state. In the meantime, it was necessary to hold down the pivot member as a clearance adjusting member with a dedicated tool, and it took a lot of work to assemble.

  An object of the present invention is to facilitate the assembly of a lash adjuster for an end pivot type valve gear.

  In order to solve the above problems, in the present invention, a clearance adjustment member is incorporated in a cylindrical body, and the clearance adjustment member is provided with a male screw that is screw-engaged with a female screw formed on the inner periphery of the body. A screw rod on the outer periphery and a pivot member that faces the outside from the front end opening of the body and pivotally supports the end of the arm of the valve gear at the front end, and is incorporated into the body. In the lash adjuster of the valve operating apparatus in which the rotational force in the direction of moving toward the pivot member is applied to the screw rod by the twisted torsion coil spring, a cap fitted and fixed in the rear end portion of the body is provided, and the cap is The screw rod is prevented from rotating, and the screw rod and the pivot member are held in the initial set state in which they are pushed into the body. When the lash adjuster is pushed through the pivot member by cranking the engine in an assembled state with respect to the valve gear, a screw rod is added by a reaction force from the bottom surface of the insertion hole as a support surface for supporting the body. The structure which has the engagement nail | claw which cancels | releases rotation prevention of this is employ | adopted.

  In the lash adjuster configured as described above, the pivot member is pushed into the body, the screw rod comes into contact with the rear end surface of the pivot member, and the torsion coil spring is given a torsional elastic force as an initial set state. Assemble to the device.

In the initial setting of the lash adjuster, the initial setting state is set by the following procedures a to c.
a: The pivot member inserted into the body is pushed in, the pivot member is placed at the initial setting position, and the screw rod is screw-engaged with the female screw of the body to screw the screw rod.
b: An assembly part in which the engagement claw of the cap is engaged with the engagement piece at the rear end of the torsion coil spring is inserted into the body from the rear end opening, and the front end of the coil spring is inserted into the rear end of the screw rod. When the cap is slidably connected, a torsional elastic force is applied to the torsion coil spring by the rotation of the cap.
c: Applying a predetermined amount of torsional force to the torsion coil spring, fitting the cap into the rear end of the body with the engaging claw preventing the screw rod from rotating, and fixing the lash adjuster in the contracted state Hold on.

  In the initial set state of the lash adjuster as described above, the lash adjuster is assembled to the valve gear.

  When the lash adjuster is assembled, the body is inserted into an insertion hole formed in the cylinder head. In this case, the body is inserted into the insertion hole with the pivot member facing upward, and the arm and the camshaft are assembled in an assembled state in which the protruding portion of the continuous piece portion is supported by the bottom surface of the insertion hole.

  When the engine is cranked after assembling the lash adjuster as described above, the lash adjuster is pushed in via the pivot member by the rotation of the cam, and the reaction force from the bottom surface of the insertion hole as the support surface for supporting the body is continuously applied. Added to the set piece, the added reaction force deforms the connected piece to release the locking against the screw rod, and the elastic force of the torsion coil spring raises the screw rod while rotating to push up the pivot member. The lash adjuster is activated by raising the pivot member to a predetermined position.

  As mentioned above, the crankset is cranked with the lash adjuster attached to the valve gear so that the initial set of the lash adjuster can be automatically released, thus preventing forgetting to cancel the initial set. Can do.

  In the lash adjuster according to the present invention, by using a plurality of engaging claws, the screw rod can be reliably prevented from rotating, and the lash adjuster can be reliably held in the initial set state.

  In addition, by forming a thin part at the base of the continuous piece part with respect to the cap of the engaging claw or by forming a narrow part, the lash adjuster is removed from the cam when the initial set is released by cranking the engine. The continuous piece portion can be reliably bent and deformed by the reaction force of the pushing force applied to the first, and the initial set can be reliably released.

  Further, a pair of engaging claws are provided at opposing positions, and each of the connecting piece portions with respect to the caps of the pair of engaging claws is inclined outwardly in opposite directions, the tip is folded outward, and the folded end is By providing the engaging claws, when the engine is cranked, the reaction force from the bottom surface of the insertion hole is applied to the tip of the connecting piece, so that the connecting piece can be easily deformed. Therefore, the rotation prevention of the screw rod by the engaging claw can be reliably released.

  Further, the distal end portions of the continuous piece portions can be kept in a deformed state by being brought into contact with each other after being deformed, and can be kept in a state in which the rotation prevention of the screw rod by the engaging claw is released.

  Here, the cap may be fixed to the body by press-fitting or by adhesion. A slot that faces in the axial direction is formed at the leading edge of the cap when it is fitted into the body, and the slot is fitted into a protrusion formed on the inner periphery of the rear end of the body, thereby securely securing the cap. Since the rotation can be prevented, the torsion coil spring can be reliably held in the twisted state.

  The cap may be made of steel or may be made of a press-formed product of a metal plate.

  In the lash adjuster according to the present invention, the screw rod can be prevented from rotating by fitting and fixing the cap with respect to the rear end of the body, and the pivot member and the screw rod can be held in the initial set state in the body. When assembling to the valve operating device, it is not necessary to manually push in the pivot member, and assembling can be facilitated.

  In addition, when the engine is cranked in a state where it is assembled to the valve operating device, the connecting piece is bent and deformed to release the detent of the screw rod by the engaging claw, and the screw rod is made by the elastic force of the torsion coil spring. As the lash adjuster is raised while rotating, the pivot member is pushed up, and the lash adjuster is activated, so that the initial set of the lash adjuster can be automatically released, so that it is possible to prevent forgetting to release the initial set.

The longitudinal front view which shows the state which incorporated the lash adjuster which concerns on this invention in the swing arm type valve gear Sectional drawing which shows the initial setting state of the lash adjuster which concerns on this invention Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. (A) thru | or (c) is sectional drawing which shows the formation procedure of an initial stage in steps Sectional view showing the released state of the initial set of lash adjusters Sectional view showing operating state of lash adjuster Sectional drawing which shows the other example of a cap Plan view showing still another example of the cap Plan view showing still another example of the cap Bottom view showing another example of angular shaft Sectional drawing along the XII-XII line of FIG. (D) is an exploded perspective view showing a means for preventing the rotation of the cap, and (e) is a sectional view of the assembled state of the cap

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a swing arm type valve gear incorporating a lash adjuster according to the present invention. In the swing arm type valve operating apparatus, a lash adjuster A is installed in the insertion hole 2 formed in the cylinder head 1, and the roller 4 is rotated in the middle of the swingable arm 3 supported at one end by the lash adjuster A. The roller 4 is supported freely, and the roller 3 is pushed down by the rotation of the cam 6 provided on the camshaft 5 to swing the arm 3, the valve stem 7 is pushed down at the other end of the arm 3, and the lower end of the valve stem 7 is The valve 8 provided in is opened.

  Here, the valve stem 7 has a spring retainer 9 at the upper end, and the valve stem 7 is attached in a direction in which the lower end valve 8 is in close contact with the valve seat 11 by the pressing force of the valve spring 10 loaded on the spring retainer 9. It is energized. A hemispherical spherical seat 12 is formed on the lower surface of one end of the arm 3.

  As shown in FIGS. 2 to 4, the lash adjuster A has a cylindrical body 21 inserted into the insertion hole 2 shown in FIG. 1, and a female screw 22 is formed on the inner peripheral portion of the body 21. . The female screw 22 is a serrated screw whose flank angle of the pressure side flank 23 is larger than the flank angle of the play side flank 24, and a cylindrical surface 25 is formed on the tip side of the serrated female screw 22. The inner diameter of the cylindrical surface 25 is equal to or larger than the diameter of the valley of the female screw 22.

  A clearance adjusting member 26 is incorporated in the body 21. The clearance adjusting member 26 includes a pivot member 27 and a screw rod 28. The pivot member 27 is slidable in the axial direction along the cylindrical surface 25 of the body 21, and a spherical surface portion 27 b that supports the spherical seat 12 of the arm 3 is formed at the distal end portion that protrudes from the distal end opening of the body 21. Yes. On the other hand, the screw rod 28 has a serrated male screw 29 formed on the outer periphery engaged with the female screw 22 of the body 21.

  As shown in FIG. 2, the pivot member 27 is formed with a hole 30 penetrating in the axial direction. The hole 30 is a stepped hole having a small diameter on the tip end side of the pivot member 27, and a presser 31 is slidably incorporated in the hole 30.

  The pressing element 31 has a protruding shaft part 32 at the center of one surface. The pressing element 31 is assembled so that the projecting shaft portion 32 faces the front end surface of the screw rod 28. The presser 31 is pulled out by a ring member 34 that is urged toward the screw rod 28 by a compression coil spring 33 as an elastic member incorporated in the hole 30 and press-fitted into the rear end of the hole 30. It has been stopped.

  In a state where the pressing element 31 is not pulled out, the projecting shaft portion 32 provided on the pressing element 31 passes through the ring member 34, and the rear end surface protruding from the pivot member 27 abuts on the front end surface of the screw rod 28, so that the screw An axial gap 35 having a size corresponding to the protruding length of the protruding shaft portion 32 is formed between the opposing surfaces of the rod 28 and the pivot member 27. Δ in FIG. 2 indicates the size of the axial gap 35.

  As shown in FIGS. 2 to 3, a torsion coil spring 36 is incorporated in the rear end portion of the body 21. The torsion coil spring 36 has a square coil portion 37 formed at the tip thereof, and the square coil portion 37 is slidably fitted to a square shaft portion 38 formed on the rear end surface of the screw rod 28, and is rotated. It has been stopped.

  In addition, an elongated rectangular tube-shaped winding portion 39 is formed at the rear end portion of the torsion coil spring 36.

  Here, the serrated female screw 22 formed on the inner periphery of the body 21 and the serrated male screw 29 provided on the outer periphery of the screw rod 28 are pivoted while the screw rod 28 is rotated by the torsional elastic force of the torsion coil spring 36. A lead angle that moves toward 27 is provided.

  A large-diameter hole 41 is formed at the rear end of the body 21, and a cylindrical cap 42 is fitted in the large-diameter hole 41. The cap 42 is fitted to the body 21 by press-fitting, but may be fixed to the body 21 by means of adhesion.

  At the front end of the cap 42, a pair of engaging claws 43 to be inserted into the winding portion 39 formed at the rear end portion of the torsion coil spring 36 are provided at opposing positions. In each of the pair of engaging claws 43, the pivot member 27 is pushed into the body 21 and disposed at the initial setting position. The screw rod 28 is placed on the projecting shaft portion 32 of the presser 31 incorporated in the pivot member 27. In the initial setting state of the lash adjuster A with which the front end surface abuts, the screw rod 28 is prevented from rotating by engaging with the angular shaft portion 38 of the screw rod 28.

  Each of the pair of engaging claws 43 has a connecting piece 44 extending inward from the rear end of the cap 42. The connecting piece 44 is substantially V in the initial set state of the lash adjuster A. The bent portion 44a faces backward from the rear end surface of the body 21.

  As shown in FIG. 2, a retaining ring 45 is attached to the tip of the body 21. The retaining ring 45 has an inward flange 46, and the inward flange 46 is vertically opposed to a stepped portion 47 formed on the outer periphery of the pivot member 27, so that the pivot member 27 extends from the front end opening of the body 21. It is designed to prevent it from coming out.

  The lash adjuster A shown in the embodiment has the above-described structure, and FIG. 2 shows that the clearance adjusting member 26 formed by the pivot member 27 and the screw rod 28 of the lash adjuster A is pushed into the body 21, and the lash adjuster A Indicates an initial set state in a contracted state.

  When forming the initial set state of the lash adjuster A as described above, first, as shown in FIG. 5 (a), the body 21 is placed in a downward state with its front end face downward, and the body 21 is opened from the front end opening. The tip of the pivot member 27 protruding downward is fitted into a positioning hole H formed in the set jig T. In this fitted state, the body 21 is pushed down to a position where the front end surface comes into contact with the upper surface of the set jig T, and the pivot member 27 is held at the initial set position.

  With the pivot member 27 disposed at the initial setting position, the screw rod 28 is inserted into the inside from the rear end opening disposed on the upper side of the body 21. At this time, the screw rod 28 is inserted into the body 21 with the angular shaft portion 38 facing upward, the male screw 29 is screw-engaged with the female screw 22, and the screw rod 28 is screwed into the body 21.

  As shown in (b), when the screw rod 28 is screwed up to a position where the tip end surface of the screw rod 28 contacts the protruding shaft portion 32 of the presser 31, the screw rod 28 enters the winding portion 39 at the rear end portion of the torsion coil spring 36. The assembly part engaged with the engaging claw 43 of the cap 42 is inserted into the body 21 from the rear end opening side.

  At this time, the assembly part is inserted into the body 21 with the square coil portion 37 of the torsion coil spring 36 as the tip, and the square coil portion 37 is slidably fitted to the square shaft portion 38 of the screw rod 28. .

  As shown in FIG. 3, in the engaged state of the cap 42 in which the engaging claw 43 of the cap 42 is engaged with the winding portion 39 of the torsion coil spring 36, as shown by the arrow in FIG. The torsion coil spring 36 is imparted with a torsional elastic force by the rotational force transmitted from the engaging claw 43 to the winding portion 39.

  When a torsional elastic force having a predetermined size is applied to the torsion coil spring 36, the cap 42 is press-fitted into the rear end portion of the body 21 to fix the cap 42, as shown in (c). At this time, the pair of engaging claws 43 provided on the cap 42 are engaged with the square shaft portion 38 of the screw rod 28, and the screw rod 28 is prevented from rotating by the engagement, and the torsion coil spring 36 is in a torsionally deformed state. The clearance adjusting member 26 formed by the pivot member 27 and the screw rod 28 is held in the pushed state, and the lash adjuster A is brought into the initial set state.

  The lash adjuster A is assembled to the valve gear in the initial set state as described above. FIG. 1 shows an assembled state in which the lash adjuster A in the initial set state is inserted into the insertion hole 2 formed in the cylinder head 1. At this time, the lash adjuster A inserts the body 21 into the insertion hole 2 with the pivot member facing upward, and after the assembly, the arm 3 and the camshaft 5 are assembled.

  When the engine is cranked after the assembly of the lash adjuster A as described above, the lash adjuster A is pushed in through the pivot member 27 by the rotation of the cam 6, and the bent portion of the connecting piece 44 is bent from the bottom surface of the insertion hole 2. The reaction force of the pushing force is applied to 44a. The reaction piece 44 bends inward of the body 21 by the reaction force, and the engagement claw 43 is separated from the square shaft portion 38 and the engagement is released as shown in FIG. Due to the disengagement, the screw rod 28 is raised while rotating by the elastic force of the torsion coil spring 36 to push up the pivot member 27.

  Further, the pivot member 27 pushes up the spherical seat 12 of the arm 3 by the spherical portion 27b on the tip side thereof to support the spherical seat 12, and the lash adjuster A moves when the pivot member 27 rises to a predetermined position. The valve device is activated to absorb the valve clearance.

  As described above, the crankset is cranked with the lash adjuster A attached to the valve gear so that the initial set of the lash adjuster A can be automatically released, thus preventing forgetting to release the initial set. can do.

  In the assembled state of the lash adjuster A with respect to the arm type valve gear, in the steady operation state of the engine, the cam piece 6a of the cam 6 contacts the roller 4 and the roller 4 is pushed down, so that the arm 3 is pivoted. The other end of the arm 3 swings downward with the other end of the arm 3 being pushed down, and the valve 8 is opened.

  At this time, the valve spring 10 is compressed and deformed, and the reaction force of the valve spring 10 is input to the pivot member 27 via the arm 3. The pivot member 27 is lowered by the input load, and when it is lowered by an amount corresponding to the axial clearance 35 formed between the pivot rod 28 and the screw rod 28, the pivot member 27 comes into contact with the tip surface of the screw rod 28.

  At this time, the input load acts on the screw engaging portion of the female screw 22 and the male screw 29. However, the female screw 22 and the male screw 29 are set to screw parameters that do not cause slippage in the screw engaging portion. When the pivot member 27 comes into contact with the screw rod 28, the pivot member 27 stops. Further, when the pivot member 27 is lowered, the pressing element 31 is pushed in the direction of immersing into the hole 30 against the elasticity of the compression coil spring 33, and the projecting shaft portion 32 is immersing into the ring member 34. It becomes.

  When the cam 6 rotates and the cam piece 6 a moves away from the roller 4 and the base circle 6 b of the cam 6 comes into contact with the roller 4, the valve stem 7 moves upward by the pressure of the valve spring 10, and the valve 8 moves to the valve seat 11. The valve 8 closes to close.

  At this time, since the reaction force of the valve spring 10 loaded on the pivot member 27 is released, the pivot member 27 is moved upward by the pressing force of the compression coil spring 33, and the presser 31 is moved along with the movement. The protruding shaft portion 32 protrudes from the lower surface of the pivot member 27.

  The pressing element 31 moves to a position where it abuts against the ring member 34, and an axial clearance 35 having a size corresponding to the protruding amount of the protruding shaft portion 32 is formed between the opposing surfaces of the pivot member 27 and the screw rod 28 by the movement. Is done.

  Thus, every time the cam 6 rotates, the pivot member 27 moves up and down by an amount corresponding to the axial gap 35, and the lash adjuster A does not expand or contract further. Actually, a slight relative slip occurs in the screw engaging portion at the moment when the input load acts on the screw engaging portion of the female screw 22 and the male screw 29, but at the moment when the input load is released, the elasticity of the torsion coil spring 36 is obtained. As a result, the screw rod 28 rotates and moves toward the pivot member 27 to return to the original position.

  When the valve clearance is shrinking due to wear of the valve seat 11 or the like, slippage occurs on the screw engaging surfaces of the screw engaging portions of the body 21 and the screw rod 28, so that the pivot member 27 and the screw rod 28 are within the body 21. The lash adjuster A contracts to absorb the valve clearance.

  On the other hand, when the valve clearance is increasing due to wear of the end of the valve stem 7, the screw rod 28 moves toward the pivot member 27 while rotating due to the elastic force of the torsion coil spring 36, and the pivot member 27. Also moves in the same direction as the screw rod 28, and the lash adjuster A extends to absorb the valve clearance.

  Here, since the axial adjuster 35 is formed between the opposing surfaces of the pivot member 27 and the screw rod 28 in the lash adjuster A, the contraction difference due to the difference in the linear expansion coefficient between the cylinder head 1 and the valve 8 is the axis. It will be absorbed by the directional gap 35 and the valve 8 is prevented from closing incompletely.

  Although the case where the lash adjuster A is applied to the swing arm type valve operating apparatus has been described as an example in FIG. 1, the valve operating apparatus to which the lash adjuster A is applied is not limited to this.

  For example, the arm is swingably supported around a rocker shaft provided above the cam, and one end of the arm is pushed up by rotation of the cam, and the valve stem is pushed down at the other end of the arm to open the valve. The present invention can also be applied to a rocker arm type valve operating apparatus that is configured to be used or a direct type valve operating apparatus that pushes down a valve stem with a cam.

  8 to 10 show other examples of the cap 42. In the cap 42 shown in FIG. 8, a thin portion 48 is formed at the base portion of the connecting piece portion 44 with respect to the cap 42 of the engaging claw 43. In FIG. 9, a pair of cutout portions 49 are formed on both sides of the base portion of the connecting piece 44 with respect to the cap 42 of the engaging claw 43, and a narrow width portion 50 is formed between the cutout portions 49.

  As described above, the thin portion 48 is formed or the narrow portion 50 is provided, so that the initial setting of the lash adjuster A by the cranking of the engine is canceled by the reaction force of the pushing force from the cam 6. The installation piece 44 can be reliably bent and deformed from the base portion with respect to the cap 42, and the initial set of the lash adjuster A can be reliably released.

  In FIG. 10, each of the connecting piece portions 44 with respect to the cap 42 of the pair of engaging claws 43 is inclined outwardly in opposite directions, the tip is folded outward, and the angled axis is placed on the tip of the folded piece 51. An engaging claw 43 to be engaged with the portion 38 is provided.

  When the cap 42 shown in FIG. 10 is used, the tip of the connecting piece 44 is pushed in the axial direction when the engine is cranked. The engagement can be released. Further, the distal end portions of the continuous piece portions 44 can be held in a deformed state by being brought into contact with each other after being deformed, and can be kept in a state in which the detent of the screw rod 28 by the engaging claws 43 is released. .

  As shown in FIGS. 11 and 12, by providing a recess 52 on the outer periphery of the square shaft portion 38 to which the engaging claw 43 formed on the cap 42 can be engaged, the screw rod 28 can be rotated more reliably. The lash adjuster A can be securely held in the initial set state.

  As shown in FIGS. 13 (d) and 13 (e), an axially oriented slot 53 is formed at the leading edge at the time of fitting into the large-diameter hole 41 formed in the body 21 of the cap 42. A projection 54 is provided on the inner periphery of the large-diameter hole 41, and the slot 53 is fitted into the projection 54 to prevent the cap 42 from rotating, thereby securely holding the torsion coil spring 36 in a twisted state. be able to.

3 Arm 21 Body 22 Female Thread 26 Clearance Adjustment Member 27 Pivot Member 28 Screw Rod 29 Male Thread 36 Torsion Coil Spring 39 Winding Part 43 Engaging Claw 44 Consecutive Piece Part 48 Thin Wall Part 50 Narrow Part 52 Concave Part 53 Slot 54 Projection Part

Claims (10)

A clearance adjustment member is incorporated in the cylindrical body, and the clearance adjustment member is externally connected to a screw rod having an external thread that is engaged with an internal thread formed on the inner periphery of the body. And a pivot member that pivotably supports the end of the arm of the valve gear at the distal end. The torsion coil spring incorporated in the body directs the screw rod toward the pivot member. In the lash adjuster of the valve operating apparatus to which the rotational force in the moving direction is applied,
A cap that is fitted and fixed in the rear end of the body is provided, and the cap prevents the screw rod from rotating, and the screw rod and the pivot member are held in an initial set state that is pushed into the body. A lash adjuster for a valve operating device, characterized by comprising a claw.   When the lash adjuster is pushed through the pivot member by cranking the engine in a built-in state with respect to the valve operating device, the engagement claw is plural, and from the bottom surface of the insertion hole as a support surface for supporting the body 2. The lash adjuster for a valve operating device according to claim 1, wherein the continuous piece of the cap is deformed by applying the reaction force to release the rotation prevention of the screw rod.   The lash adjuster for a valve operating apparatus according to claim 1 or 2, wherein a thin portion is formed in a continuous piece portion with respect to the cap of the engaging claw.   The lash adjuster for a valve operating apparatus according to claim 1 or 2, wherein a narrow portion is formed in a continuous piece portion with respect to the cap of the engaging claw.   A pair of the engaging claws are provided at opposing positions, each of the connecting piece portions of the pair of engaging claws with respect to the cap is inclined outwardly in opposite directions, and the tip is folded outward, and the folded end is The lash adjuster for a valve operating apparatus according to claim 2, wherein an engagement claw is provided.   The lash adjuster for a valve operating apparatus according to any one of claims 1 to 5, wherein the cap is fixed by press-fitting the inner periphery of the rear end of the body.   The lash adjuster for a valve operating apparatus according to any one of claims 1 to 5, wherein the cap is fixed by adhesion.   The slot according to any one of Claims 1 thru / or 7 which formed the slot which faces in the direction of an axis from the fitting end in the cap, and fitted the slot into the projection part formed in the inner periphery of the rear-end part of a body, and stopped the cap. A lash adjuster for a valve operating device according to any one of the above items.   The lash adjuster for a valve operating apparatus according to any one of claims 1 to 8, wherein the cap is made of steel.   The lash adjuster for a valve operating apparatus according to any one of claims 1 to 8, wherein the cap is made of a press-formed product of a metal plate.

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