WO2009096353A1 - Lash adjuster - Google Patents
Lash adjuster Download PDFInfo
- Publication number
- WO2009096353A1 WO2009096353A1 PCT/JP2009/051171 JP2009051171W WO2009096353A1 WO 2009096353 A1 WO2009096353 A1 WO 2009096353A1 JP 2009051171 W JP2009051171 W JP 2009051171W WO 2009096353 A1 WO2009096353 A1 WO 2009096353A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nut member
- screw
- spring seat
- adjustment screw
- lash adjuster
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead camshafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- This invention relates to a lash adjuster incorporated in an engine valve gear.
- valve operating device that operates a valve provided at the intake port or exhaust port of an engine
- the central part of the arm supported so as to be swingable with one end as a fulcrum is pushed down by a cam, and the valve stem is moved at the other end of the arm.
- One end of the arm that is pushed down (swing arm type valve operating device) or the arm supported so as to be able to swing with the center as a fulcrum is pushed up with a cam, and the valve stem is pushed down at the other end of the arm
- swing arm type valve operating device a valve lifter supported so as to be slidable up and down by a cam
- a valve stem pushed down by the valve lifter direct type valve operating device
- a lash adjuster is generally incorporated in the valve operating device, and the lash adjuster absorbs the change in the gap between the components of the valve operating device.
- a lifter body that is slidably inserted into a guide hole formed in the cylinder head, a nut member that moves up and down integrally with the lifter body, and an inner periphery of the nut member
- An adjustment screw having a male screw on its outer periphery that engages with the formed female screw, and a return spring that urges the adjustment screw in a direction that protrudes downward from the nut member, from the nut member of the adjustment screw
- Patent Document 2 A device that presses a valve stem of a valve operating device at a protruding end
- the screw member is engaged with a nut member inserted into a receiving hole opened in the lower surface of the arm that swings according to the rotation of the cam, and a female screw formed on the inner periphery of the nut member.
- An adjusting screw having a male screw on the outer periphery thereof, and a return spring for biasing the adjusting screw in a direction protruding downward from the nut member, and a protruding end of the adjusting screw from the nut member What presses a valve stem is known (patent document 3).
- the male screw of the adjusting screw and the female screw of the nut member are the flank of the pressure side flank that receives pressure when a force in the direction in which the adjusting screw is pushed into the nut member (hereinafter referred to as the “pushing direction”) is applied.
- the angle is formed in a sawtooth shape larger than the flank angle of the play side flank, and when a force in the pushing direction is applied to the adjustment screw by the rotation of the cam, the pressure side flank of the adjustment screw male screw It is received by the pressure side flank of the female screw, and the axial position of the adjusting screw is fixed.
- the return spring is in direct contact with the insertion end of the adjustment screw into the nut member. Therefore, when the adjusting screw moves in the axial direction while rotating, the adjusting screw may not rotate smoothly due to friction between the adjusting screw and the return spring.
- the lash adjuster described in Patent Document 2 incorporates a spring seat between the return spring and the adjustment screw in order to prevent friction between the adjustment screw and the return spring.
- the spring seat has a convex spherical contact surface with the adjusting screw, and the convex spherical surface is in point contact with the adjusting screw.
- the adjustment screw of this lash adjuster has a cylindrical hollow structure with an opening at the insertion end to the nut member, and a spring seat is fitted to the inner periphery of the adjustment screw so as to be relatively rotatable, and the fitting Thus, the adjusting screw and the spring seat are held coaxially.
- the spring seat is fitted to the inner periphery of the adjustment screw, so the outer periphery of the spring seat contacts the adjustment screw, and the adjustment screw may not rotate smoothly due to friction between the contact surfaces. was there.
- the problem to be solved by the present invention is to provide a lash adjuster in which the adjustment screw rotates smoothly.
- the adjusting screw has a solid structure, a spring seat that is in point contact with the insertion end of the adjusting screw into the nut member is incorporated between the adjusting screw and the return spring, and the spring seat is inserted into the nut.
- the inner periphery of the member was slidably fitted in the axial direction, and the adjustment screw and the spring seat were held coaxially by the fitting.
- the axial length of the fitting surface of the spring seat with respect to the female screw is determined by the pitch of the female screw. Is also preferable.
- the spring seat includes, for example, a cylindrical portion that fits on the inner periphery of the nut member, and an end portion that makes point contact with the insertion end of the adjustment screw into the nut member. It is possible to adopt a structure in which the return spring is inserted.
- one of the contact surfaces of the adjusting screw and the spring seat may be a convex spherical surface, the other may be a flat surface, one may be a convex spherical surface, the other may be a concave spherical surface, and one may be a convex spherical surface, Or a convex spherical surface.
- the outer periphery of the spring seat does not contact the adjustment screw, and no friction occurs between the outer periphery of the spring seat and the adjustment screw. Further, even if the outer periphery of the spring seat contacts the inner periphery of the nut member, the rotation of the adjusting screw is not hindered. Therefore, the adjustment screw can rotate smoothly.
- the fitting surface of the spring seat is guided by the female screw over the entire circumference.
- the radial position of the spring seat is likely to be more stable than in the case where the axial length of the fitting surface is shorter than the pitch of the female screw.
- the spring seat includes a cylindrical portion that fits on an inner periphery of the nut member, and an end portion that makes point contact with an insertion end of the adjusting screw into the nut member, and the return to the cylindrical portion of the spring seat.
- the fitting surface of the spring seat with respect to the inner periphery of the nut member overlaps the return spring in the radial direction, so that the axial length of the lash adjuster can be suppressed.
- one having a convex spherical surface and the other having a flat surface is easy to process the contact surface and is low in cost.
- one having a convex spherical surface and the other having a concave spherical surface makes the spring seat less inclined and the contact position between the adjustment screw and the spring seat is stable.
- one having a convex spherical surface and the other having a convex spherical surface has extremely small friction between the contact surfaces, and further reduces the rotational resistance of the adjustment screw. Can do.
- FIG. 1 is an enlarged cross-sectional view in the vicinity of a lash adjuster of the valve gear shown in FIG.
- An enlarged cross-sectional view showing a modification in which the contact surface on the spring seat side is replaced with a concave spherical surface among the contact surfaces of the adjusting screw and the spring seat shown in FIG. 2 is an enlarged cross-sectional view showing a modification in which the contact surface on the adjustment screw side is replaced with a flat surface and the contact surface on the spring seat side is replaced with a convex spherical surface.
- FIG. 2 is an enlarged cross-sectional view showing a modified example in which the contact surface on the spring seat side is replaced with a convex spherical surface among the contact surfaces of the adjusting screw and the spring seat shown in FIG. 2 is an enlarged cross-sectional view showing a modification in which the spring seat shown in FIG. 2 is replaced with a spring seat having a cylindrical portion fitted to the inner periphery of the nut member and an end portion in point contact with the insertion end of the adjusting screw into the nut member.
- Figure 6 is an enlarged cross-sectional view showing a modification in which the contact surface on the spring seat side is replaced with a concave spherical surface among the contact surfaces of the adjusting screw and the spring seat shown in FIG.
- FIG. 6 is an enlarged cross-sectional view showing a modification in which the contact surface on the adjustment screw side is replaced with a flat surface and the contact surface on the spring seat side is replaced with a convex spherical surface among the contact surfaces of the adjustment screw and the spring seat shown in FIG.
- FIG. 6 is an enlarged cross-sectional view showing a modification in which the contact surface on the spring seat side is replaced with a convex spherical surface among the contact surfaces of the adjusting screw and the spring seat shown in FIG.
- the front view which shows the valve operating apparatus incorporating the lash adjuster of 2nd Embodiment of this invention.
- Front view showing a valve gear incorporating a lash adjuster according to a third embodiment of the present invention.
- FIG. 1 shows a valve gear incorporating a lash adjuster 1 according to the first embodiment of the present invention.
- This valve operating apparatus has a valve 4 provided in an intake port 3 of an engine cylinder head 2, a valve stem 5 connected to the valve 4, and an arm 7 that swings in response to rotation of a cam 6. .
- the valve stem 5 extends upward from the valve 4 and slidably penetrates the cylinder head 2.
- An annular spring retainer 8 is fixed to the upper outer periphery of the valve stem 5, and a valve spring 9 is incorporated between the lower surface of the spring retainer 8 and the upper surface of the cylinder head 2.
- the valve spring 9 urges the valve stem 5 upward via the spring retainer 8, and the valve 4 is seated on the valve seat 10 by the urging force.
- the arm 7 has one end supported by the lash adjuster 1 and the other end in contact with the upper end of the valve stem 5.
- a roller 11 is attached to the central portion of the arm 7, and the roller 11 is in contact with a cam 6 provided above the arm 7.
- the lash adjuster 1 is screwed into a cylindrical nut member 13 inserted into a receiving hole 12 opened on the upper surface of the cylinder head 2 and a female screw 14 formed on the inner periphery of the nut member 13.
- An adjustment screw 16 having a male screw 15 to be joined on the outer periphery of the lower part, a return spring 17 for urging the adjustment screw 16, and a spring seat 18 incorporated between the return spring 17 and the adjustment screw 16.
- the male screw 15 and the female screw 14 are formed in a sawtooth shape having an asymmetric cross section along the axis, and the pressure-side flank 19 that receives pressure when a force in the direction of pushing the adjusting screw 16 into the nut member 13 is applied.
- the flank angle is larger than the flank angle of the play side flank 20.
- the return spring 17 has a lower end supported by the bottom 21 of the nut member 13, and an upper end pressing the adjustment screw 16 via the spring seat 18, and the adjustment screw 16 protrudes upward from the nut member 13 by the pressing. Energized in the direction.
- the adjusting screw 16 has a solid structure, and a convex spherical surface 22 is formed at the insertion end to the nut member 13.
- the spring seat 18 has a flat surface 23 that contacts the convex spherical surface 22.
- the convex spherical surface 22 of the adjusting screw 16 and the flat surface 23 of the spring seat 18 are in point contact at the rotation center of the adjusting screw 16.
- the spring seat 18 is fitted to the female screw 14 on the inner periphery of the nut member 13 so as to be slidable in the axial direction, and the adjustment screw 16 and the spring seat 18 are held coaxially by the fitting.
- the fitting surface 24 of the spring seat 18 with respect to the female screw 14 is formed in a cylindrical shape, and the axial length of the fitting surface 24 is longer than the pitch of the female screw 14.
- the spring seat 18 is formed with a projection 25 that fits to the inner periphery of the end of the return spring 17, and the return spring 17 and the spring seat 18 are held coaxially by the fitting of the projection 25.
- the return spring 17 becomes difficult to buckle, and the reliability of the return spring 17 is improved. Can be improved.
- the protruding end 26 of the adjusting screw 16 from the nut member 13 is fitted into a recess 27 formed on the lower surface of the end of the arm 7 and supports the arm 7 so that it can swing around the protruding end 26.
- the spring seat 18 is fitted to the inner periphery of the nut member 13, so that the outer periphery of the spring seat 18 does not contact the adjustment screw 16, and between the outer periphery of the spring seat 18 and the adjustment screw 16. There is no friction. Even if the outer periphery of the spring seat 18 contacts the inner periphery of the nut member 13, the rotation of the adjusting screw 16 is not hindered. Therefore, the adjustment screw 16 can rotate smoothly.
- the fitting surface 24 of the spring seat 18 since the axial length of the fitting surface 24 of the spring seat 18 is longer than the pitch of the internal thread 14 on the inner periphery of the nut member 13, the fitting surface 24 of the spring seat 18 has the entire circumference. And is guided by a female screw 14. Therefore, the radial position of the spring seat 18 is likely to be stable as compared with a lash adjuster in which the axial length of the fitting surface 24 is shorter than the pitch of the female screw 14.
- the adjustment screw 16 is a solid structure, the rigidity of the adjustment screw 16 is higher than that of the lash adjuster that employs a hollow structure adjustment screw in which an insertion end to the nut member 13 is opened. Therefore, when the male screw 15 on the outer periphery of the adjusting screw 16 is formed by rolling, the male screw 15 is unlikely to be an incomplete screw.
- the contact surface on the adjusting screw 16 side is the convex spherical surface 22 and the contact surface on the spring seat 18 side is the flat surface 23, but as shown in FIG.
- the contact surface on the adjustment screw 16 side may be a flat surface 28, and the contact surface on the spring seat 18 side may be a convex spherical surface 29.
- the contact surface between the adjustment screw 16 and the spring seat 18 has a convex spherical surface 30 as the contact surface on the adjustment screw 16 side, and the radius of curvature of the contact surface on the spring seat 18 side as compared with the convex spherical surface 30.
- a large concave spherical surface 31 may be used. If it does in this way, the posture of spring seat 18 will become difficult to incline, and the contact position of adjustment screw 16 and spring seat 18 will be stabilized.
- the contact surface on the spring seat 18 side may be a convex spherical surface (not shown), and the contact surface on the adjustment screw 16 side may be a concave spherical surface (not shown).
- the contact surface between the adjusting screw 16 and the spring seat 18 may be a convex spherical surface 32 on the adjusting screw 16 side, and the convex spherical surface 33 may also be a contact surface on the spring seat 18 side. If it does in this way, the friction between the contact surfaces of the adjusting screw 16 and the spring seat 18 will become very small, and the rotational resistance of the adjusting screw 16 can be reduced more.
- the solid spring seat 18 is fitted to the inner periphery of the nut member 13, and the spring seat 18 is brought into point contact with the insertion end of the adjusting screw 16 into the nut member 13.
- a spring including a cylindrical portion 34 fitted to the inner periphery of the nut member 13 and an end portion 35 that makes point contact with the insertion end of the adjusting screw 16 into the nut member 13.
- the seat 36 may be adopted, and the return spring 17 may be inserted into the cylindrical portion 34 of the spring seat 36.
- the axial length of the fitting surface 37 of the spring seat 36 is longer than the length of two pitches of the female screw 14 as shown in FIG. In this way, even when the spring seat 36 is in any axial position, the fitting surface 37 of the spring seat 36 is guided by the female screw 14 at two or more positions separated in the axial direction. The posture of the seat 36 is difficult to tilt, and the contact position between the adjustment screw 16 and the spring seat 36 can be stabilized.
- the contact surface between the adjusting screw 16 and the spring seat 36 has a convex spherical surface 38 as shown in FIGS.
- the flat surface 39 When the flat surface 39 is used, the processing of the contact surface becomes easy, and the processing cost can be reduced.
- the inclination of the posture of the spring seat 36 can be prevented by contact between the convex spherical surface 40 and the concave spherical surface 41. Further, as shown in FIG.
- FIG. 10 shows a valve gear incorporating a lash adjuster 51 according to the second embodiment of the present invention.
- this valve operating apparatus includes a valve 54 provided in the intake port 53 of the cylinder head 52 and a valve stem 55 connected to the valve 54.
- the valve stem 55 extends upward from the valve 54, and a spring retainer 56 is fixed to the upper portion of the valve stem 55.
- the spring retainer 56 is urged upward by a valve spring 57, and the valve 54 is seated on the valve seat 58 by the urging force.
- the lash adjuster 51 is formed on a lifter body 60 that is slidably inserted into a guide hole 59 formed in the cylinder head 52, a nut member 61 that moves up and down integrally with the lifter body 60, and an inner periphery of the nut member 61.
- An adjustment screw 64 having a male screw 63 that engages with the female screw 62 on the outer periphery, a return spring 65 that urges the adjustment screw 64, and a spring seat 66 that is incorporated between the adjustment screw 64 and the return spring 65. Consists of.
- the lifter body 60 includes a cylindrical portion 67 and an end plate 68 that closes the upper end of the cylindrical portion 67.
- a hard shim 69 is fixed to the upper surface of the end plate 68, and the cam 70 is in contact with the shim 69.
- the nut member 61 is integrally formed at the center of the end plate 68, and the upper end of the nut member 61 is closed by a shim 69.
- the flank angle of the pressure side flank that receives pressure when a force in the direction of pushing the adjusting screw 64 into the nut member 61 is larger than the flank angle of the play side flank.
- the return spring 65 is supported at its upper end by a shim 69 and its lower end presses the adjustment screw 64 via a spring seat 66, and the adjustment screw 64 is biased in a direction protruding downward from the nut member 61 by the pressing. is doing.
- the protruding end of the adjusting screw 64 from the nut member 61 presses the upper end of the valve stem 55.
- the adjusting screw 64 has a solid structure, and a convex spherical surface is formed at the insertion end to the nut member 61.
- the spring seat 66 has a flat surface that contacts the convex spherical surface.
- the adjustment screw 64 and the spring seat 66 are in point contact at the rotation center of the adjustment screw 64.
- the spring seat 66 is fitted to the female screw 62 on the inner periphery of the nut member 61 so as to be slidable in the axial direction, and the adjustment screw 64 and the spring seat 66 are held coaxially by the fitting.
- the fitting surface of the spring seat 66 with respect to the female screw 62 is formed in a cylindrical shape, and the axial length of the fitting surface is longer than the pitch of the female screw 62.
- the spring seat 66 includes a cylindrical portion 71 fitted to the inner periphery of the nut member 61 and an end portion 72 that makes point contact with the insertion end of the adjusting screw 64 into the nut member 61.
- a return spring 65 is inserted.
- the lash adjuster 51 has the spring seat 66 fitted to the inner periphery of the nut member 61, so the outer periphery of the spring seat 66 does not contact the adjustment screw 64, and the outer periphery of the spring seat 66 is There is no friction between the adjusting screw 64 and the adjusting screw 64. Further, even if the outer periphery of the spring seat 66 contacts the inner periphery of the nut member 61, the rotation of the adjusting screw 64 is not hindered. Therefore, the adjustment screw 64 can be rotated smoothly.
- the fitting surface of the spring seat 66 since the axial length of the fitting surface of the spring seat 66 is longer than the pitch of the female screw 62 on the inner periphery of the nut member 61, the fitting surface of the spring seat 66 has a female screw over the entire circumference. Guided at 62. Therefore, the radial position of the spring seat 66 is likely to be stable as compared with a lash adjuster in which the axial length of the fitting surface is shorter than the pitch of the female screw 62.
- the adjustment screw 64 is a solid structure, the rigidity of the adjustment screw 64 is higher than that of the lash adjuster employing a hollow structure adjustment screw in which the insertion end to the nut member 61 is opened. Therefore, when the external thread 63 on the outer periphery of the adjusting screw 64 is formed by rolling, the external thread 63 is unlikely to be an incomplete thread.
- the contact surface on the adjustment screw 64 side is a convex spherical surface
- the contact surface on the spring seat 66 side is a flat surface
- the contact surface on the adjustment screw 64 side may be a flat surface
- the contact surface on the spring seat 66 side may be a convex spherical surface
- one of the contact surfaces of the adjusting screw 64 and the spring seat 66 may be a convex spherical surface
- the other may be a concave spherical surface
- one may be a convex spherical surface
- the other may be a convex spherical surface.
- the cylindrical portion 71 fitted to the inner periphery of the nut member 61 and the end that makes point contact with the insertion end of the adjustment screw 64 into the nut member 61 A spring seat 66 composed of a portion 72 is employed, and a return spring 65 is inserted into the cylindrical portion 71 of the spring seat 66.
- a solid spring seat (not shown) is used.
- the nut member 61 may be fitted to the inner periphery, and the spring seat may make point contact with the insertion end of the adjusting screw 64 into the nut member 61.
- the nut member 61 and the lifter body 60 are integrally formed.
- the nut member 61 may be formed separately from the lifter body 60, and the nut member 61 may be fixed to the lifter body 60. In short, when the lifter body moves up and down, the nut member may move up and down integrally with the lifter body.
- FIG. 11 shows a valve gear incorporating a lash adjuster 81 according to a third embodiment of the present invention.
- This valve operating apparatus includes a valve 84 provided in an intake port 83 of an engine cylinder head 82, a valve stem 85 connected to the valve 84, and an arm 87 supported so as to be swingable about a fulcrum shaft 86. And have.
- the valve stem 85 extends upward from the valve 84, and a spring retainer 88 is fixed to the upper portion of the valve stem 85.
- the spring retainer 88 is urged upward by a valve spring 89, and the valve 84 is seated on the valve seat 90 by the urging force.
- the arm 87 is supported at the center by a fulcrum shaft 86 so as to be swingable.
- a roller 92 that contacts the cam 91 is attached to one end of the arm 87 so that the arm 87 swings in accordance with the rotation of the cam 91.
- a lash adjuster 81 is incorporated in the other end of the arm 87.
- the lash adjuster 81 includes a nut member 93, an adjustment screw 94, a return spring 95, and a spring seat 96 incorporated between the adjustment screw 94 and the return spring 95.
- the nut member 93 is inserted into a receiving hole 97 that penetrates the arm 87 up and down, and a female screw 98 formed on the inner periphery of the nut member 93 engages with a male screw 99 formed on the outer periphery of the adjusting screw 94. is doing.
- the upper end of the nut member 93 protrudes from the upper surface of the arm 87, and a bottomed cylindrical cap 100 is fitted and fixed to the protruding portion.
- the cap 100 is locked to the upper edge of the accommodation hole 97 to prevent the nut member 93 from dropping downward from the accommodation hole 97.
- a flange 101 that abuts the lower surface of the arm 87 is formed at the lower end of the nut member 93, and the upward force acting on the nut member 93 is received by the flange 101.
- the flank angle of the pressure flank that receives pressure when the force in the direction of pushing the adjusting screw 94 into the nut member 93 is larger than the flank angle of the play flank.
- the return spring 95 is supported at the upper end by the cap 100 and the lower end presses the adjustment screw 94 via the spring seat 96, and the adjustment screw 94 is biased in a direction protruding downward from the nut member 93 by the pressing. is doing.
- the adjusting screw 94 has a solid structure, and a convex spherical surface is formed at the insertion end to the nut member 93.
- the spring seat 96 has a flat surface that contacts the convex spherical surface.
- the adjustment screw 94 and the spring seat 96 are in point contact at the rotation center of the adjustment screw 94.
- the spring seat 96 is fitted to the inner periphery of the nut member 93 so as to be slidable in the axial direction, and the adjustment screw 94 and the spring seat 96 are held coaxially by the fitting.
- the spring seat 96 includes a cylindrical portion 102 fitted to the inner periphery of the nut member 93 and an end portion 103 that makes point contact with the insertion end of the adjusting screw 94 into the nut member 93.
- a return spring 95 is inserted.
- the spring seat 96 is fitted to the inner periphery of the nut member 93 as in the first embodiment, so that the outer periphery of the spring seat 96 does not contact the adjustment screw 94 and the outer periphery of the spring seat 96 is There is no friction between the adjusting screw 94 and the adjusting screw 94. Further, even if the outer periphery of the spring seat 96 contacts the inner periphery of the nut member 93, the rotation of the adjustment screw 94 is not hindered. Therefore, the adjustment screw 94 can rotate smoothly.
- the adjustment screw 94 is a solid structure, the rigidity of the adjustment screw 94 is higher than that of the lash adjuster employing a hollow structure adjustment screw in which an insertion end to the nut member 93 is opened. Therefore, when the external thread 99 on the outer periphery of the adjusting screw 94 is formed by rolling, the external thread 99 is unlikely to be an incomplete thread.
- the contact surface on the adjusting screw 94 side is a convex spherical surface
- the contact surface on the spring seat 96 side is a flat surface
- the contact surface on the adjustment screw 94 side may be a flat surface
- the contact surface on the spring seat 96 side may be a convex spherical surface.
- one of the contact surfaces of the adjusting screw 94 and the spring seat 96 may be a convex spherical surface, the other may be a concave spherical surface, one may be a convex spherical surface, and the other may be a convex spherical surface.
- the cylindrical portion 102 fitted to the inner periphery of the nut member 93 and the end that makes point contact with the insertion end of the adjustment screw 94 into the nut member 93.
- a spring seat 96 composed of a portion 103 is adopted, and a return spring 95 is inserted into the cylindrical portion 102 of the spring seat 96.
- a solid spring seat is placed inside the nut member 93. The spring seat may be fitted to the circumference so as to make point contact with the insertion end of the adjusting screw 94 into the nut member 93.
- the adjusting screws 16, 64, 94, the nut members 13, 61, 93, and the spring seats 18, 36, 66, 96 can be formed of an iron-based material, and carburizing treatment or carburizing on the surface thereof. Durability can be improved by performing nitriding or soft nitriding.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
2 シリンダヘッド
7 アーム
12 収容穴
13 ナット部材
14 雌ねじ
15 雄ねじ
16 アジャストスクリュ
17 リターンスプリング
18 スプリングシート
22 凸球面
23 平面
24 嵌合面
26 突出端
28 平面
29 凸球面
30 凸球面
31 凹球面
32 凸球面
33 凸球面
34 円筒部
35 端部
36 スプリングシート
37 嵌合面
38 凸球面
39 平面
40 凸球面
41 凹球面
42 凸球面
43 凸球面
51 ラッシュアジャスタ
52 シリンダヘッド
55 バルブステム
59 ガイド孔
60 リフタボディ
61 ナット部材
62 雌ねじ
63 雄ねじ
64 アジャストスクリュ
65 リターンスプリング
66 スプリングシート
81 ラッシュアジャスタ
85 バルブステム
87 アーム
91 カム
93 ナット部材
94 アジャストスクリュ
95 リターンスプリング
96 スプリングシート
97 収容穴
98 雌ねじ
99 雄ねじ DESCRIPTION OF
Claims (8)
- シリンダヘッド(2)の上面に開口した収容穴(12)に挿入されるナット部材(13)と、そのナット部材(13)の内周に形成された雌ねじ(14)にねじ係合する雄ねじ(15)を外周に有するアジャストスクリュ(16)と、そのアジャストスクリュ(16)をナット部材(13)から上方に突出する方向に付勢するリターンスプリング(17)とを有し、前記アジャストスクリュ(16)のナット部材(13)からの突出端(26)で動弁装置のアーム(7)を揺動可能に支持するラッシュアジャスタ(1)において、前記アジャストスクリュ(16)を中実構造とし、そのアジャストスクリュ(16)のナット部材(13)への挿入端に点接触するスプリングシート(18)をアジャストスクリュ(16)とリターンスプリング(17)の間に組み込み、そのスプリングシート(18)を前記ナット部材(13)の内周に軸方向に摺動可能に嵌合させ、その嵌合によって、前記アジャストスクリュ(16)とスプリングシート(18)を同軸に保持したことを特徴とするラッシュアジャスタ。 A nut member (13) to be inserted into the accommodation hole (12) opened on the upper surface of the cylinder head (2), and a male screw (14) that engages with a female screw (14) formed on the inner periphery of the nut member (13). 15) an adjustment screw (16) having an outer periphery thereof, and a return spring (17) for urging the adjustment screw (16) in a direction protruding upward from the nut member (13), the adjustment screw (16) ) In the lash adjuster (1) that supports the arm (7) of the valve gear with a protruding end (26) from the nut member (13) in a swingable manner, the adjusting screw (16) has a solid structure, The spring screw (18) that makes point contact with the insertion end of the adjustment screw (16) into the nut member (13) is connected to the adjustment screw (16) and the return spring. (17), the spring seat (18) is fitted to the inner periphery of the nut member (13) so as to be slidable in the axial direction, and the adjustment screw (16) and the spring seat are thereby fitted. A lash adjuster characterized in that (18) is held coaxially.
- シリンダヘッド(52)に形成されたガイド孔(59)に上下にスライド可能に挿入されるリフタボディ(60)と、そのリフタボディ(60)と一体に上下動するナット部材(61)と、そのナット部材(61)の内周に形成された雌ねじ(62)にねじ係合する雄ねじ(63)を外周に有するアジャストスクリュ(64)と、そのアジャストスクリュ(64)をナット部材(61)から下方に突出する方向に付勢するリターンスプリング(65)とを有し、前記アジャストスクリュ(64)のナット部材(61)からの突出端で動弁装置のバルブステム(55)を押圧するラッシュアジャスタ(51)において、前記アジャストスクリュ(64)を中実構造とし、そのアジャストスクリュ(64)のナット部材(61)への挿入端に点接触するスプリングシート(66)をアジャストスクリュ(64)とリターンスプリング(65)の間に組み込み、そのスプリングシート(66)を前記ナット部材(61)の内周に軸方向に摺動可能に嵌合させ、その嵌合によって、前記アジャストスクリュ(64)とスプリングシート(66)を同軸に保持したことを特徴とするラッシュアジャスタ。 A lifter body (60) slidably inserted into a guide hole (59) formed in the cylinder head (52), a nut member (61) moving up and down integrally with the lifter body (60), and the nut member An adjustment screw (64) having a male screw (63) on the outer periphery that engages with a female screw (62) formed on the inner periphery of (61), and the adjustment screw (64) projecting downward from the nut member (61) A lash adjuster (51) for pressing the valve stem (55) of the valve gear with a protruding end from the nut member (61) of the adjusting screw (64). The adjustment screw (64) has a solid structure, and the adjustment screw (64) is pointed at the insertion end of the adjustment screw (64) into the nut member (61). The spring seat (66) to be touched is assembled between the adjustment screw (64) and the return spring (65), and the spring seat (66) is fitted to the inner periphery of the nut member (61) so as to be slidable in the axial direction. The lash adjuster is characterized in that the adjusting screw (64) and the spring seat (66) are held coaxially by the fitting.
- カム(91)の回転に応じて揺動するアーム(87)の下面に開口した収容穴(97)に挿入されるナット部材(93)と、そのナット部材(93)の内周に形成された雌ねじ(98)にねじ係合する雄ねじ(99)を外周に有するアジャストスクリュ(94)と、そのアジャストスクリュ(94)をナット部材(93)から下方に突出する方向に付勢するリターンスプリング(95)とを有し、前記アジャストスクリュ(94)のナット部材(93)からの突出端で動弁装置のバルブステム(85)を押圧するラッシュアジャスタ(81)において、前記アジャストスクリュ(94)を中実構造とし、そのアジャストスクリュ(94)のナット部材(93)への挿入端に点接触するスプリングシート(96)をアジャストスクリュ(94)とリターンスプリング(95)の間に組み込み、そのスプリングシート(96)を前記ナット部材(93)の内周に軸方向に摺動可能に嵌合させ、その嵌合によって、前記アジャストスクリュ(94)とスプリングシート(96)を同軸に保持したことを特徴とするラッシュアジャスタ。 A nut member (93) inserted into a receiving hole (97) opened in the lower surface of the arm (87) that swings according to the rotation of the cam (91), and formed on the inner periphery of the nut member (93) An adjustment screw (94) having a male screw (99) on the outer periphery thereof that engages with the female screw (98), and a return spring (95) that urges the adjustment screw (94) in a direction protruding downward from the nut member (93). In a lash adjuster (81) that presses the valve stem (85) of the valve gear with the protruding end from the nut member (93) of the adjust screw (94), the adjust screw (94) is A spring seat (96) that makes an actual structure and makes point contact with the insertion end of the adjusting screw (94) into the nut member (93) is attached to the adjusting screw (94). And the return spring (95), and the spring seat (96) is fitted to the inner periphery of the nut member (93) so as to be slidable in the axial direction. And a spring seat (96) held coaxially, a lash adjuster.
- 前記スプリングシート(18)が前記ナット部材(13)の内周の雌ねじ(14)に軸方向に摺動可能に嵌合し、そのスプリングシート(18)の前記雌ねじ(14)に対する嵌合面(24)の軸方向長さを雌ねじ(14)のピッチよりも長くした請求項1から3のいずれかに記載のラッシュアジャスタ。 The spring seat (18) is fitted to the internal thread (14) of the inner periphery of the nut member (13) so as to be slidable in the axial direction, and the fitting surface of the spring seat (18) with respect to the female thread (14) ( The lash adjuster according to any one of claims 1 to 3, wherein the axial length of 24) is longer than the pitch of the female screw (14).
- 前記スプリングシート(36)が、前記ナット部材(13)の内周に嵌合する円筒部(34)と、前記アジャストスクリュ(16)のナット部材(13)への挿入端に点接触する端部(35)とからなり、そのスプリングシート(36)の円筒部(34)内に前記リターンスプリング(17)を挿入した請求項1から4のいずれかに記載のラッシュアジャスタ。 The spring seat (36) is a cylindrical portion (34) fitted to the inner periphery of the nut member (13), and an end portion that makes point contact with an insertion end of the adjustment screw (16) into the nut member (13). The lash adjuster according to any one of claims 1 to 4, wherein the return spring (17) is inserted into a cylindrical portion (34) of the spring seat (36).
- 前記アジャストスクリュ(16)と前記スプリングシート(18)の接触面のうち、一方を凸球面(22)とし、他方を平面(23)とした請求項1から5のいずれかに記載のラッシュアジャスタ。 The lash adjuster according to any one of claims 1 to 5, wherein one of the contact surfaces of the adjustment screw (16) and the spring seat (18) is a convex spherical surface (22) and the other is a flat surface (23).
- 前記アジャストスクリュ(16)と前記スプリングシート(18)の接触面のうち、一方を凸球面(30)とし、他方を凹球面(31)とした請求項1から5のいずれかに記載のラッシュアジャスタ。 The lash adjuster according to any one of claims 1 to 5, wherein one of the contact surfaces of the adjustment screw (16) and the spring seat (18) is a convex spherical surface (30) and the other is a concave spherical surface (31). .
- 前記アジャストスクリュ(16)と前記スプリングシート(18)の接触面のうち、一方を凸球面(32)とし、他方も凸球面(33)とした請求項1から5のいずれかに記載のラッシュアジャスタ。 The lash adjuster according to any one of claims 1 to 5, wherein one of the contact surfaces of the adjustment screw (16) and the spring seat (18) is a convex spherical surface (32) and the other is a convex spherical surface (33). .
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/811,845 US20100275865A1 (en) | 2008-01-28 | 2009-01-26 | Lash adjuster |
DE112009000091T DE112009000091T5 (en) | 2008-01-28 | 2009-01-26 | Lash adjuster |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-016111 | 2008-01-28 | ||
JP2008016111A JP2009174488A (en) | 2008-01-28 | 2008-01-28 | Lash adjuster |
Publications (1)
Publication Number | Publication Date |
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WO2009096353A1 true WO2009096353A1 (en) | 2009-08-06 |
Family
ID=40912706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2009/051171 WO2009096353A1 (en) | 2008-01-28 | 2009-01-26 | Lash adjuster |
Country Status (4)
Country | Link |
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US (1) | US20100275865A1 (en) |
JP (1) | JP2009174488A (en) |
DE (1) | DE112009000091T5 (en) |
WO (1) | WO2009096353A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010026852A1 (en) | 2010-07-12 | 2012-01-12 | Schaeffler Technologies Gmbh & Co. Kg | Valve clearance compensating element for internal combustion engine, has flat edge with angle largely selected such that locking is provided with low friction and wall thickness of case is reduced, so that expansion of case is enabled |
DE102010026860A1 (en) | 2010-07-12 | 2012-01-12 | Schaeffler Technologies Gmbh & Co. Kg | Mechanical valve clearance compensation element with two-part adjusting bolt |
DE102011003763A1 (en) | 2011-02-08 | 2012-08-09 | Schaeffler Technologies Gmbh & Co. Kg | Valve clearance compensation element for automatic mechanical adjustment of gas shuttle valve in combustion engine, has conical clamping piston comprising annular collar that grips side of clamp body, where side faces position bolt |
DE102011003903A1 (en) | 2011-02-10 | 2012-08-16 | Schaeffler Technologies Gmbh & Co. Kg | Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve |
CN104034237A (en) * | 2014-06-13 | 2014-09-10 | 江苏鑫悦汽车零部件有限公司 | Engine valve conical surface thickness size detection tool |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE112008003314T5 (en) * | 2007-12-07 | 2010-10-21 | NTN Corporation, Osaka-shi | Lash adjuster |
JP2011127533A (en) * | 2009-12-18 | 2011-06-30 | Ntn Corp | Arm type valve gear |
KR101418700B1 (en) * | 2014-03-11 | 2014-07-10 | (주)제이에스더블유 | Apparatus for preventing blurring of transfer hanger |
JP6518910B2 (en) * | 2015-02-16 | 2019-05-29 | 株式会社テージーケー | Motorized valve |
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JP2006328971A (en) * | 2005-05-23 | 2006-12-07 | Ntn Corp | Lash adjuster in valve gear |
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JP2003227318A (en) | 2002-02-06 | 2003-08-15 | Ntn Corp | Lash adjuster in valve system |
JP4027724B2 (en) * | 2002-06-12 | 2007-12-26 | Ntn株式会社 | Rush adjuster in valve gear |
JP2004346821A (en) * | 2003-05-22 | 2004-12-09 | Ntn Corp | Arm type valve gear |
JP4204501B2 (en) | 2004-03-24 | 2009-01-07 | Ntn株式会社 | Automatic valve clearance adjustment device |
-
2008
- 2008-01-28 JP JP2008016111A patent/JP2009174488A/en active Pending
-
2009
- 2009-01-26 US US12/811,845 patent/US20100275865A1/en not_active Abandoned
- 2009-01-26 DE DE112009000091T patent/DE112009000091T5/en not_active Withdrawn
- 2009-01-26 WO PCT/JP2009/051171 patent/WO2009096353A1/en active Application Filing
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JPH0444407U (en) * | 1990-08-13 | 1992-04-15 | ||
JP2003521624A (en) * | 2000-02-02 | 2003-07-15 | マッケクニー スペシャリスト プロダクツ リミテッド | Automatic valve clearance adjustment device |
JP2006132426A (en) * | 2004-11-05 | 2006-05-25 | Ntn Corp | Arm type valve gear |
JP2006328971A (en) * | 2005-05-23 | 2006-12-07 | Ntn Corp | Lash adjuster in valve gear |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010026852A1 (en) | 2010-07-12 | 2012-01-12 | Schaeffler Technologies Gmbh & Co. Kg | Valve clearance compensating element for internal combustion engine, has flat edge with angle largely selected such that locking is provided with low friction and wall thickness of case is reduced, so that expansion of case is enabled |
DE102010026860A1 (en) | 2010-07-12 | 2012-01-12 | Schaeffler Technologies Gmbh & Co. Kg | Mechanical valve clearance compensation element with two-part adjusting bolt |
US8635981B2 (en) | 2010-07-12 | 2014-01-28 | Schaeffler Technologies AG & Co. KG | Mechanical valve clearance compensation element with two-part adjusting bolts |
DE102011003763A1 (en) | 2011-02-08 | 2012-08-09 | Schaeffler Technologies Gmbh & Co. Kg | Valve clearance compensation element for automatic mechanical adjustment of gas shuttle valve in combustion engine, has conical clamping piston comprising annular collar that grips side of clamp body, where side faces position bolt |
DE102011003903A1 (en) | 2011-02-10 | 2012-08-16 | Schaeffler Technologies Gmbh & Co. Kg | Valve train for internal combustion engine, has valve clearance compensation element with mechanical and automatic adjustment of gas exchange valve |
CN104034237A (en) * | 2014-06-13 | 2014-09-10 | 江苏鑫悦汽车零部件有限公司 | Engine valve conical surface thickness size detection tool |
Also Published As
Publication number | Publication date |
---|---|
US20100275865A1 (en) | 2010-11-04 |
DE112009000091T5 (en) | 2010-12-09 |
JP2009174488A (en) | 2009-08-06 |
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