WO2009093528A1 - ラッシュアジャスタ - Google Patents
ラッシュアジャスタ Download PDFInfo
- Publication number
- WO2009093528A1 WO2009093528A1 PCT/JP2009/050534 JP2009050534W WO2009093528A1 WO 2009093528 A1 WO2009093528 A1 WO 2009093528A1 JP 2009050534 W JP2009050534 W JP 2009050534W WO 2009093528 A1 WO2009093528 A1 WO 2009093528A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nut member
- screw
- lash adjuster
- male screw
- protruding
- 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
- F01L1/14—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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
-
- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
-
- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
-
- 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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L1/462—Valve return spring arrangements
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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
- F01L2303/00—Manufacturing of components used in valve arrangements
-
- 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
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
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 documents 3 and 4).
- Patent Documents 1 to 3 a compression coil spring that applies an axial force in a direction protruding from the nut member to the adjustment screw is used as the return spring. Moreover, in patent document 4, the torsion spring which provides the adjusting screw with the rotational force of the direction which protrudes from a nut member is used as a return spring.
- the lash adjuster usually has only a slight slip between the male screw of the adjusting screw and the female screw of the nut member.
- an abnormal load or vibration is applied to the adjustment screw due to overspeed of the engine, or when the frictional resistance between the pressure side flank is reduced due to wear of the male screw and female screw, or due to rapid thermal expansion of the valve gear
- slippage more than necessary may occur between the male screw of the adjustment screw and the female screw of the nut member.
- the adjustment screw is pushed into the nut member greatly, and the return spring may be excessively compressed and damaged, and in the swing arm type valve operating device, the arm may fall off.
- the adjustment screw in order to prevent the return spring from being excessively compressed and broken when the adjustment screw is pushed into the nut member, the adjustment screw is brought into contact with the bottom of the nut member at the insertion end of the adjustment screw into the nut member. It is conceivable to provide a cylindrical extension that restricts the movement of the screw so as to surround the return spring. However, in this case, since the rigidity of the cylindrical extension of the adjusting screw is low, there is a problem that when the male screw on the outer periphery of the adjusting screw is rolled, the male screw tends to be an incomplete screw.
- the problem to be solved by the present invention is that when the adjusting screw is pushed into the nut member, the return spring can be prevented from being excessively compressed, and the external screw on the outer periphery of the adjusting screw can be easily rolled. It is to provide a lash adjuster.
- a stopper portion having a diameter larger than the inner diameter of the nut member is provided at a protruding portion of the adjustment screw from the nut member, and the stopper portion abuts on an open end of the nut member to move the adjustment screw.
- the lash adjuster can be configured such that a tapered surface formed on the outer periphery of the stopper portion abuts on a tapered surface formed on the open end of the nut member. In this way, when the adjustment screw is pushed into the nut member, the inclination of the adjustment screw can be prevented by the contact between the tapered surfaces, so that the subsequent adjustment screw can be smoothly moved in the protruding direction. .
- a plane perpendicular to the axial direction formed on the outer periphery of the stopper portion can be brought into contact with a plane perpendicular to the axial direction formed at the open end of the nut member. Even if it does in this way, when the adjustment screw is pushed into the nut member, the inclination of the adjustment screw can be prevented by the contact between the flat surfaces, so that the subsequent movement of the adjustment screw in the protruding direction is smooth.
- the stopper portion may be provided integrally with the adjusting screw, or may be provided separately from the adjusting screw. In the latter case, as the stopper portion, for example, a retaining ring mounted on the outer periphery of the protruding portion from the nut member of the adjustment screw can be employed.
- the present invention can be applied to a lash adjuster in which a compression coil spring that applies an axial force in a direction protruding from a nut member to an adjustment screw is used as the return spring.
- the male screw and the female screw are on the pressure side.
- a sawtooth screw having a flank angle larger than that of the play side flank can be employed.
- the present invention can also be applied to a lash adjuster that uses a torsion spring that applies a rotational force in a direction protruding from the nut member to the adjustment screw as the return spring.
- the male screw and the female screw are sawtooth screws.
- Triangular screws, or trapezoidal screws can be employed.
- the torsion spring include a torsion coil spring, a spring, and a bamboo spring.
- the present invention can be applied to, for example, the following lash adjuster.
- the nut member is inserted into a receiving hole opened in the upper surface of the cylinder head, and the adjustment screw is a swing arm type valve that supports an arm of a valve operating device at a protruding end from the nut member so as to be swingable.
- Rush adjuster for equipment 2)
- the nut member is fixed to a lifter body that is slidably inserted into a guide hole formed in the cylinder head, and the adjustment screw presses a valve stem of a valve operating device at a protruding end from the nut member.
- Rush adjuster for direct valve operating.
- the adjustment screw includes a pivot member inserted into the nut member so as to be slidable in the axial direction, a male screw member supporting an insertion end of the pivot member into the nut member, and having the male screw on an outer periphery, and the pivot member And an elastic member sandwiched between male screw members.
- a square hole is formed at the insertion end of the pivot member into the nut member, and a square shaft that fits into the square hole is formed in the male screw member. It is preferable that the pivot member and the male screw member rotate together. If it does in this way, since a male screw member can be rotated by rotation operation of a pivot member, the operation
- the stopper portion when the adjustment screw is pushed into the nut member, the stopper portion abuts on the open end of the nut member and restricts the movement of the adjustment screw, thereby preventing the return spring from being excessively compressed. can do.
- this lash adjuster has a stopper portion that restricts the movement of the adjusting screw provided at the protruding portion of the adjusting screw from the nut member, so that the bottom end of the adjusting screw is brought into contact with the bottom member. Therefore, it is not necessary to provide a cylindrical extension for restricting the movement of the adjusting screw, and the external screw on the outer periphery of the adjusting screw can be easily rolled.
- FIG. 2 is an enlarged sectional view showing another modification of the lash adjuster shown in FIG.
- FIG. 2 is an enlarged sectional view showing still another modification of the lash adjuster shown in FIG.
- the front view which shows the valve operating apparatus incorporating the lash adjuster of 2nd Embodiment of this invention.
- FIG. 2 is an enlarged sectional view showing a modification of the return spring shown in FIG.
- FIG. 7 is an enlarged sectional view showing a modification of the return spring shown in FIG.
- FIG. 11 is an enlarged sectional view showing a modification of the return spring shown in FIG.
- FIG. 11 is an enlarged sectional view showing another modification of the return spring shown in FIG.
- FIG. 11 is an enlarged sectional view showing still another modification of the return spring shown in FIG. Sectional view along line XV-XV in FIG.
- 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 lash adjuster 1 is screwed into a cylindrical nut member 12 inserted into an accommodation hole 11 opened in the upper surface of the cylinder head 2 and a female screw 13 formed on the inner periphery of the nut member 12.
- An adjustment screw 15 having a male screw 14 to be joined on the outer periphery of the lower part, a bottom member 16 fixed to the lower end of the nut member 12, and a return spring 17 incorporated between the adjustment screw 15 and the bottom member 16.
- the male screw 14 and the female screw 13 have a flank angle of the pressure side flank 18 that receives the axial load when an axial load in a direction of pushing the adjusting screw 15 into the nut member 12 is applied, and a flank angle of the play side flank 19. It is formed in a larger sawtooth shape.
- the return spring 17 is a compression coil spring.
- the return spring 17 has a lower end supported by the bottom member 16 and an upper end that applies an axial force in a direction protruding from the nut member 12 via the spring seat 20 to the adjusting screw 15. Due to the axial force, the adjusting screw 15 is biased in a direction protruding upward from the nut member 12.
- the insertion end of the adjustment screw 15 into the nut member 12 is formed in a cylindrical shape that accommodates the spring seat 20.
- the arm 7 has a recess 21 fitted to the protruding end of the adjusting screw 15 from the nut member 12 on the lower surface of one end, and is supported by the protruding end of the adjusting screw 15 so as to be swingable.
- the lower surface of the other end of the arm 7 is in contact with the upper end of the valve stem 5, and a roller 22 that is in contact with the cam 6 disposed above the arm 7 is attached to the center of the arm 7.
- a stopper portion 23 having a diameter larger than the inner diameter of the nut member 12 is provided at a protruding portion of the adjustment screw 15 from the nut member 12.
- the stopper portion 23 has a taper surface 24 formed on the outer periphery of the stopper portion 23 when the adjustment screw 15 is pushed into the nut member 12, and a taper formed on the open end of the nut member 12.
- the movement of the adjusting screw 15 is regulated by coming into contact with the surface 25.
- the stopper portion 23 can be formed by rolling simultaneously with the male screw 14.
- the adjusting screw 15 is largely pushed into the nut member 12, but as shown in FIG. 2, the stopper portion 23 abuts against the open end of the nut member 12 to restrict the movement of the adjusting screw 15, It is possible to prevent the return spring 17 from being excessively compressed and broken, or the arm 7 from falling off.
- the tapered surface 24 on the outer periphery of the stopper portion 23 comes into contact with the tapered surface 25 at the open end of the nut member 12, and the tapered surface thereof. Since the inclination of the adjustment screw 15 can be prevented by the contact between 24 and 25, the subsequent movement of the adjustment screw 15 in the protruding direction is smooth.
- the stopper 23 having a diameter larger than the inner diameter of the nut member 12 is provided integrally with the adjusting screw 15 at the protruding portion of the adjusting screw 15 from the nut member 12. It may be provided separately. In this case, as the stopper portion, for example, as shown in FIG. 4, a retaining ring 28 attached to the outer periphery of the protruding portion of the adjusting screw 15 from the nut member 12 can be employed.
- the adjustment screw 15 is shown in FIG. You may divide
- FIG. 6 shows a valve gear incorporating the lash adjuster 31 according to the second embodiment of the present invention. Similar to the first embodiment, this valve operating apparatus has a valve 34 provided in the intake port 33 of the cylinder head 32 and a valve stem 35 connected to the valve 34. The valve stem 35 extends upward from the valve 34, and a spring retainer 36 is fixed to the upper portion of the valve stem 35. The spring retainer 36 is biased upward by a valve spring 37, and the valve 34 is seated on the valve seat 38 by the biasing force.
- the lash adjuster 31 is formed on a guide hole 39 formed in the cylinder head 32 so as to be slidable up and down, a nut member 41 that moves up and down integrally with the lifter body 40, and an inner periphery of the nut member 41.
- An adjustment screw 44 having a male screw 43 that engages with the female screw 42 on the outer periphery, and a return spring 45 that urges the adjustment screw 44 in a direction protruding downward from the nut member 41.
- the lifter body 40 includes a cylindrical portion 46 and an end plate 47 that closes the upper end of the cylindrical portion 46.
- a hard shim 48 is fixed to the upper surface of the end plate 47, and a cam 49 is in contact with the shim 48.
- the nut member 41 is integrally formed at the center of the end plate 47, and the upper end of the nut member 41 is closed with a shim 48.
- the male screw 43 and the female screw 42 are such that the flank angle of the pressure side flank that receives the axial load when the axial load in the direction of pushing the adjusting screw 44 into the nut member 41 is applied is larger than the flank angle of the play side flank. It is formed in a large sawtooth shape.
- the return spring 45 is a compression coil spring.
- the return spring 45 has an upper end supported by a shim 48 and a lower end that applies an axial force in a direction protruding from the nut member 41 via the spring seat 50 to the adjusting screw 44.
- the adjustment screw 44 is urged by the axial force in a direction protruding downward from the nut member 41.
- the protruding end of the adjustment screw 44 from the nut member 41 presses the upper end of the valve stem 35.
- the insertion end of the adjustment screw 44 to the nut member 41 is formed in a cylindrical shape that accommodates the spring seat 50.
- a stopper portion 51 having a diameter larger than the inner diameter of the nut member 41 is provided at a protruding portion of the adjustment screw 44 from the nut member 41.
- the stopper portion 51 abuts against the open end of the nut member 41 and restricts the movement of the adjustment screw 44.
- the stopper 51 can be formed by rolling simultaneously with the male screw 43.
- the lash adjuster 31 normally has only a slight slip between the male screw 43 of the adjusting screw 44 and the female screw 42 of the nut member 41.
- the male screw 43 of the adjusting screw 44 is used. More than necessary slippage may occur between the female screw 42 of the nut member 41.
- the adjusting screw 44 is largely pushed into the nut member 41, but the stopper portion 51 abuts against the open end of the nut member 41 and restricts the movement of the adjusting screw 44, so that the return spring 45 is excessively compressed and damaged. Can be prevented.
- the lash adjuster 31 is provided with a stopper portion 51 for restricting the movement of the adjusting screw 44 at a protruding portion from the nut member 41 of the adjusting screw 44. Therefore, at the insertion end of the adjusting screw 44 into the nut member 41, It is not necessary to provide a cylindrical extension that abuts the shim 48 and restricts the movement of the adjusting screw 44, and the male screw 43 on the outer periphery of the adjusting screw 44 can be easily rolled.
- the nut member 41 and the lifter body 40 are integrally formed.
- the nut member 41 may be formed separately from the lifter body 40 and the nut member 41 may be fixed to the lifter body 40.
- the nut member 41 may be moved up and down integrally with the lifter body 40 when the lifter body 40 is moved up and down.
- FIG. 7 shows a valve gear incorporating a lash adjuster 61 according to a third embodiment of the present invention.
- This valve operating apparatus includes a valve 64 provided in an intake port 63 of a cylinder head 62 of an engine, a valve stem 65 connected to the valve 64, and an arm 67 supported so as to be swingable around a fulcrum shaft 66. And have.
- the valve stem 65 extends upward from the valve 64, and a spring retainer 68 is fixed to the upper portion of the valve stem 65.
- the spring retainer 68 is biased upward by a valve spring 69, and the valve 64 is seated on the valve seat 70 by the biasing force.
- the arm 67 is supported at the center by a fulcrum shaft 66 so as to be swingable.
- a roller 72 that contacts the cam 71 is attached to one end of the arm 67 so that the arm 67 swings in accordance with the rotation of the cam 71.
- a lash adjuster 61 is incorporated in the other end of the arm 67.
- the lash adjuster 61 includes a nut member 73, an adjustment screw 74, and a return spring 75.
- the nut member 73 is inserted into a receiving hole 76 that vertically penetrates the arm 67, and a female screw 77 formed on the inner periphery of the nut member 73 is engaged with a male screw 78 formed on the outer periphery of the adjusting screw 74. is doing.
- the upper end of the nut member 73 protrudes from the upper surface of the arm 67, and a bottomed cylindrical cap 79 is fitted and fixed to the protruding portion.
- the cap 79 is engaged with the upper edge of the accommodation hole 76 to prevent the nut member 73 from dropping downward from the accommodation hole 76.
- a flange 80 that contacts the lower surface of the arm 67 is formed at the lower end of the nut member 73, and the upward force acting on the nut member 73 is received by the flange 80.
- the male screw 78 and the female screw 77 are such that the flank angle of the pressure side flank receiving the axial load when the axial load in the direction of pushing the adjusting screw 74 into the nut member 73 is applied is larger than the flank angle of the play side flank. It is formed in a large sawtooth shape.
- the return spring 75 is a compression coil spring.
- the return spring 75 has an upper end supported by a cap 79 and a lower end that applies an axial force in a direction protruding from the nut member 73 via the spring seat 81 to the adjusting screw 74.
- the adjustment screw 74 is urged by the axial force in a direction protruding downward from the nut member 73.
- the protruding end of the adjusting screw 74 from the nut member 73 presses the upper end of the valve stem 65.
- a stopper portion 82 having a diameter larger than the inner diameter of the nut member 73 is provided at a protruding portion of the adjustment screw 74 from the nut member 73.
- the stopper portion 82 abuts against the open end of the nut member 73 and restricts the movement of the adjustment screw 74.
- the stopper portion 82 can be formed by rolling simultaneously with the male screw 78.
- the lash adjuster 61 normally has only a slight slip between the male screw 78 of the adjusting screw 74 and the female screw 77 of the nut member 73.
- the male screw 78 of the adjusting screw 74 is used. More than necessary slippage may occur between the internal thread 77 of the nut member 73 and the nut member 73.
- the adjusting screw 74 is largely pushed into the nut member 73, but the stopper portion 82 abuts against the open end of the nut member 73 and restricts the movement of the adjusting screw 74, so that the return spring 75 is excessively compressed and damaged. Can be prevented.
- the lash adjuster 61 is provided with a stopper portion 82 for restricting the movement of the adjusting screw 74 at a protruding portion from the nut member 73 of the adjusting screw 74. Therefore, at the insertion end of the adjusting screw 74 to the nut member 73, There is no need to provide a cylindrical extension that abuts against the cap 79 and restricts the movement of the adjusting screw 74, and the external thread 78 on the outer periphery of the adjusting screw 74 can be easily rolled.
- a compression coil spring is used as the return spring 17 that urges the adjustment screw 15 in a direction protruding upward from the nut member 12, but a torsion coil spring may be used as shown in FIG. Good.
- the return spring 17 has a lower end locked in a locking hole 83 formed in the bottom member 16, and an upper end locked in a locking hole 84 formed in the adjusting screw 15. Due to the torsional deformation, a rotational force in a direction protruding from the nut member 12 is applied to the adjusting screw 15.
- a torsion coil spring can be employed as the return spring 45 that biases the adjustment screw 44 in a direction protruding downward from the nut member 41.
- the return spring 45 has an upper end locked in a locking hole 85 formed in the shim 48 and a lower end locked in a locking hole 86 formed in the adjusting screw 44.
- a rotational force in a direction protruding from the nut member 41 is applied to the adjusting screw 44.
- the external thread 43 on the outer periphery of the adjusting screw 44 and the internal thread 42 on the inner periphery of the nut member 41 are vertically symmetrical trapezoidal screws.
- a torsion coil spring can be employed as the return spring 75 that urges the adjusting screw 74 in a direction protruding downward from the nut member 73.
- the return spring 75 has an upper end locked in a locking hole 87 formed in the cap 79, and a lower end locked in a locking hole 88 formed in the adjusting screw 74.
- a rotational force in a direction protruding from the nut member 73 is applied to the adjusting screw 74.
- the external thread 78 on the outer periphery of the adjusting screw 74 and the internal thread 77 on the inner periphery of the nut member 73 are vertically symmetrical triangular screws.
- FIG. 11 shows a valve gear incorporating a lash adjuster 91 according to a fourth embodiment of the present invention. Portions corresponding to the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the adjustment screw 15 includes a pivot member 15A inserted in the nut member 12 so as to be slidable in the axial direction, a male screw member 15B supporting the insertion end of the pivot member 15A into the nut member 12 and having a male screw 14 on the outer periphery.
- the spring washer 15C is sandwiched between the pivot member 15A and the male screw member 15B.
- a disc spring washer or a corrugated washer can be used as the spring washer 15C.
- an annular retaining member 92 that passes through the pivot member 15A is mounted at the open end of the nut member 12.
- the pivot member 15 ⁇ / b> A has an annular groove 93 formed in a portion crossing the open end of the nut member 12, and the retaining member 92 enters the groove 93, so that the pivot member 15 ⁇ / b> A is retained from the nut member 12. Yes.
- a stopper portion 23 having a diameter larger than the inner diameter of the nut member 12 is provided at a protruding portion of the pivot member 15A from the nut member 12.
- the stopper portion 23 has a flat surface 94 formed on the outer periphery of the stopper portion 23 that is perpendicular to the axial direction and has a retaining member 92 at the open end of the nut member 12.
- the movement of the pivot member 15A is restricted by abutting against a plane 95 perpendicular to the axial direction formed in the above.
- the pivot member 15 ⁇ / b> A has a square hole 96 formed at the center of the insertion end into the nut member 12.
- the male screw member 15B is formed with a square shaft 97 that fits into the square hole 96.
- the pivot member 15A and the male screw member 15B are fitted by fitting the square shaft 97 and the square hole 96. Are designed to rotate together.
- the return spring 17 is a torsion coil spring.
- the return spring 17 has a lower end locked in a locking hole 98 formed in the bottom member 16, and an upper end locked in a locking hole 99 formed in the male screw member 15B.
- the rotational force in the direction in which the pivot member 15A protrudes from the nut member 12 is applied to the male screw member 15B.
- this lash adjuster 91 since the stopper portion 23 for restricting the movement of the adjusting screw 15 is provided in the protruding portion from the nut member 12 of the pivot member 15A, the insertion end of the male screw member 15B into the nut member 12 In addition, there is no need to provide a cylindrical extension that abuts the bottom member 16 and restricts the movement of the adjustment screw 15, and the male screw 14 on the outer periphery of the male screw member 15B can be easily rolled.
- the lash adjuster 91 is provided between the male screw member 15B and the pivot member 15A when the engine is stopped in a high temperature state and thereafter the engine is cooled to cause a contraction difference between the constituent members of the valve gear.
- the compression difference of the spring washer 15C is absorbed. Therefore, when the engine is restarted, a gap due to a contraction difference between the constituent members of the valve operating device does not occur between the valve 4 and the valve seat 10, and compression leakage does not occur.
- the lash adjuster 91 is configured such that the pivot member 15A and the male screw member 15B rotate integrally by fitting the square shaft 97 and the square hole 96, so that the male screw member 15B is rotated by the pivoting operation of the pivot member 15A. Can be rotated. Therefore, the work of assembling the male screw member 15B into the nut member 12 is easier than in the case where the square shaft 97 and the square hole 96 are not provided.
- the spring washer 15C is used as an elastic member sandwiched between the pivot member 15A and the male screw member 15B.
- another elastic member for example, a compression coil spring
- a compression coil spring may be used instead of the spring washer 15C.
- the return spring 17 When a torsion coil spring is used as the return spring 17, the return spring 17 may be a cylinder wound as shown in FIG. 11 or a cone wound as shown in FIG. May be.
- a torsion spring for example, a spring or a bamboo spring
- the torsion coil spring may be employed.
- the return spring 17 is a spring that is obtained by winding a thin plate material into a spiral shape.
- the return spring 17 has a large-diameter end that is prevented from rotating by the bottom member 16 of the nut member 12, and a small-diameter end that is inserted into a slit formed in the protrusion 100 at the insertion end of the male screw member 15B into the nut member 12.
- a rotational force in a direction in which the pivot member 15A protrudes from the nut member 12 is applied to the male screw member 15B.
- the external thread 14 on the outer periphery of the external thread member 15B and the internal thread 13 on the inner periphery of the nut member 12 are vertically symmetrical triangular screws.
- the return spring 17 is a bamboo child spring in which a thin plate material is spirally wound.
- the return spring 17 has a large-diameter end that is prevented from rotating by the bottom member 16 of the nut member 12, and a small-diameter end that is inserted into a slit formed in the protrusion 101 at the insertion end of the male screw member 15B into the nut member 12.
- a rotational force in a direction in which the pivot member 15A protrudes from the nut member 12 is applied to the male screw member 15B.
- the male screw 14 on the outer periphery of the male screw member 15B and the female screw 13 on the inner periphery of the nut member 12 are vertically symmetrical trapezoidal screws.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
1)前記ナット部材は、シリンダヘッドの上面に開口した収容穴に挿入され、前記アジャストスクリュは、前記ナット部材からの突出端で動弁装置のアームを揺動可能に支持するスイングアーム式動弁装置のラッシュアジャスタ。
2)前記ナット部材は、シリンダヘッドに形成されたガイド孔に上下にスライド可能に挿入されるリフタボディに固定され、前記アジャストスクリュは、前記ナット部材からの突出端で動弁装置のバルブステムを押圧するダイレクト式動弁装置のラッシュアジャスタ。3)前記ナット部材は、カムの回転に応じて揺動するアームの下面に開口した収容穴に挿入され、前記アジャストスクリュは、前記ナット部材からの突出端で動弁装置のバルブステムを押圧するロッカアーム式動弁装置のラッシュアジャスタ。
2 シリンダヘッド
7 アーム
11 収容穴
12 ナット部材
13 雌ねじ
14 雄ねじ
15 アジャストスクリュ
15A ピボット部材
15B 雄ねじ部材
15C ばね座金
17 リターンスプリング
18 圧力側フランク
19 遊び側フランク
23 ストッパ部
24,25 テーパ面
26,27 平面
28 止め輪
31 ラッシュアジャスタ
32 シリンダヘッド
35 バルブステム
39 ガイド孔
40 リフタボディ
41 ナット部材
42 雌ねじ
43 雄ねじ
44 アジャストスクリュ
45 リターンスプリング
51 ストッパ部
61 ラッシュアジャスタ
65 バルブステム
67 アーム
71 カム
73 ナット部材
74 アジャストスクリュ
75 リターンスプリング
76 収容穴
77 雌ねじ
78 雄ねじ
82 ストッパ部
91 ラッシュアジャスタ
94,95 平面
96 角穴
97 角軸
Claims (12)
- 内周に雌ねじ(13)を有するナット部材(12)と、前記雌ねじ(13)にねじ係合する雄ねじ(14)を外周に有するアジャストスクリュ(15)と、そのアジャストスクリュ(15)をナット部材(12)から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(15)をナット部材(12)に押し込む方向の軸方向荷重が負荷されたときに、その軸方向荷重を前記雄ねじ(14)と雌ねじ(13)の圧力側フランク(18)で受けるラッシュアジャスタにおいて、
前記アジャストスクリュ(15)のナット部材(12)からの突出部分にナット部材(12)の内径よりも大径のストッパ部(23)を設け、そのストッパ部(23)をナット部材(12)の開放端で受け止めることにより、ナット部材(12)に押し込まれる方向のアジャストスクリュ(15)の移動を規制したことを特徴とするラッシュアジャスタ。 - 前記ストッパ部(23)の外周に形成されたテーパ面(24)が、前記ナット部材(12)の開放端に形成されたテーパ面(25)に当接するようにした請求項1に記載のラッシュアジャスタ。
- 前記ストッパ部(23)の外周に形成された軸方向に対して直角な平面(26)が、前記ナット部材(12)の開放端に形成された軸方向に対して直角な平面(27)に当接するようにした請求項1に記載のラッシュアジャスタ。
- 前記ストッパ部(23)が、前記アジャストスクリュ(15)のナット部材(12)からの突出部分の外周に装着した止め輪(28)である請求項1に記載のラッシュアジャスタ。
- 前記リターンスプリング(17)は、前記ナット部材(12)から突出する方向の軸方向力をアジャストスクリュ(15)に付与する圧縮コイルばねであり、前記雄ねじ(14)と雌ねじ(13)は、圧力側フランク(18)のフランク角が遊び側フランク(19)のフランク角よりも大きい鋸歯ねじである請求項1から4のいずれかに記載のラッシュアジャスタ。
- 前記リターンスプリング(17)は、前記ナット部材(12)から突出する方向の回転力をアジャストスクリュ(15)に付与するねじりばねであり、前記雄ねじ(14)と雌ねじ(13)は、鋸歯ねじ、台形ねじ又は三角ねじである請求項1から4のいずれかに記載のラッシュアジャスタ。
- 前記ねじりばねが、ねじりコイルばね、ゼンマイばね、竹の子ばねのいずれかである請求項6に記載のラッシュアジャスタ。
- 前記ナット部材(12)は、シリンダヘッド(2)の上面に開口した収容穴(11)に挿入され、前記アジャストスクリュ(15)は、前記ナット部材(12)からの突出端で動弁装置のアーム(7)を揺動可能に支持する請求項1から7のいずれかに記載のラッシュアジャスタ。
- 前記ナット部材(41)は、シリンダヘッド(32)に形成されたガイド孔(39)に上下にスライド可能に挿入されるリフタボディ(40)に固定され、前記アジャストスクリュ(44)は、前記ナット部材(41)からの突出端で動弁装置のバルブステム(35)を押圧する請求項1から7のいずれかに記載のラッシュアジャスタ。
- 前記ナット部材(73)は、カム(71)の回転に応じて揺動するアーム(67)の下面に開口した収容穴(76)に挿入され、前記アジャストスクリュ(74)は、前記ナット部材(73)からの突出端で動弁装置のバルブステム(65)を押圧する請求項1から7のいずれかに記載のラッシュアジャスタ。
- 前記アジャストスクリュ(15)が、前記ナット部材(12)内に軸方向にスライド可能に挿入されたピボット部材(15A)と、そのピボット部材(15A)のナット部材(12)内への挿入端を支持し、前記雄ねじ(14)を外周に有する雄ねじ部材(15B)と、前記ピボット部材(15A)と雄ねじ部材(15B)の間に挟まれた弾性部材(15C)とからなる請求項1から10のいずれかに記載のラッシュアジャスタ。
- 前記ピボット部材(15A)のナット部材(12)内への挿入端に角穴(96)を形成し、その角穴(96)に嵌合する角軸(97)を前記雄ねじ部材(15B)に形成し、その角軸(97)と前記角穴(96)の嵌合によって前記ピボット部材(15A)と雄ねじ部材(15B)が一体に回転するようにした請求項11に記載のラッシュアジャスタ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE112009000189T DE112009000189T5 (de) | 2008-01-22 | 2009-01-16 | Ventilspiel-Einstellvorrichtung |
US12/811,225 US20100288219A1 (en) | 2008-01-22 | 2009-01-16 | Lash adjuster |
Applications Claiming Priority (4)
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JP2008011409 | 2008-01-22 | ||
JP2008-011409 | 2008-01-22 | ||
JP2008-325682 | 2008-12-22 | ||
JP2008325682A JP2009197791A (ja) | 2008-01-22 | 2008-12-22 | ラッシュアジャスタ |
Publications (1)
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WO2009093528A1 true WO2009093528A1 (ja) | 2009-07-30 |
Family
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PCT/JP2009/050534 WO2009093528A1 (ja) | 2008-01-22 | 2009-01-16 | ラッシュアジャスタ |
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US (1) | US20100288219A1 (ja) |
JP (1) | JP2009197791A (ja) |
DE (1) | DE112009000189T5 (ja) |
WO (1) | WO2009093528A1 (ja) |
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JP2011127533A (ja) * | 2009-12-18 | 2011-06-30 | Ntn Corp | アーム式動弁装置 |
KR20190019036A (ko) | 2016-06-17 | 2019-02-26 | 니탄 밸브 가부시키가이샤 | 기계식 래시 어저스터 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6434407U (ja) * | 1987-08-25 | 1989-03-02 | ||
JP2006328971A (ja) * | 2005-05-23 | 2006-12-07 | Ntn Corp | 動弁装置におけるラッシュアジャスタ |
JP2006336584A (ja) * | 2005-06-03 | 2006-12-14 | Ntn Corp | ダイレクト式動弁装置 |
JP2008002444A (ja) * | 2006-06-26 | 2008-01-10 | Ntn Corp | アーム式動弁装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3069049D1 (en) * | 1980-01-12 | 1984-10-04 | Gkn Technology Ltd | Valve clearance adjuster |
EP1252418A2 (en) * | 2000-02-02 | 2002-10-30 | McKechnie Specialist Products Limited | Automatic valve clearance adjuster |
JP2003227318A (ja) | 2002-02-06 | 2003-08-15 | Ntn Corp | 動弁装置におけるラッシュアジャスタ |
JP4204501B2 (ja) | 2004-03-24 | 2009-01-07 | Ntn株式会社 | バルブクリアランス自動調整装置 |
JP2006132426A (ja) | 2004-11-05 | 2006-05-25 | Ntn Corp | アーム式動弁装置 |
-
2008
- 2008-12-22 JP JP2008325682A patent/JP2009197791A/ja active Pending
-
2009
- 2009-01-16 WO PCT/JP2009/050534 patent/WO2009093528A1/ja active Application Filing
- 2009-01-16 US US12/811,225 patent/US20100288219A1/en not_active Abandoned
- 2009-01-16 DE DE112009000189T patent/DE112009000189T5/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6434407U (ja) * | 1987-08-25 | 1989-03-02 | ||
JP2006328971A (ja) * | 2005-05-23 | 2006-12-07 | Ntn Corp | 動弁装置におけるラッシュアジャスタ |
JP2006336584A (ja) * | 2005-06-03 | 2006-12-14 | Ntn Corp | ダイレクト式動弁装置 |
JP2008002444A (ja) * | 2006-06-26 | 2008-01-10 | Ntn Corp | アーム式動弁装置 |
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DE112009000189T5 (de) | 2011-02-03 |
US20100288219A1 (en) | 2010-11-18 |
JP2009197791A (ja) | 2009-09-03 |
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