WO1996022454A1 - Rattrapeur de jeu pour moteur a combustion interne - Google Patents

Rattrapeur de jeu pour moteur a combustion interne Download PDF

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Publication number
WO1996022454A1
WO1996022454A1 PCT/JP1995/000054 JP9500054W WO9622454A1 WO 1996022454 A1 WO1996022454 A1 WO 1996022454A1 JP 9500054 W JP9500054 W JP 9500054W WO 9622454 A1 WO9622454 A1 WO 9622454A1
Authority
WO
WIPO (PCT)
Prior art keywords
bucket
plunger
peripheral surface
combustion engine
internal combustion
Prior art date
Application number
PCT/JP1995/000054
Other languages
English (en)
Japanese (ja)
Inventor
Makoto Yasuike
Original Assignee
Nittan Valve Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nittan Valve Co., Ltd. filed Critical Nittan Valve Co., Ltd.
Priority to EP95906493A priority Critical patent/EP0752516A1/fr
Priority to PCT/JP1995/000054 priority patent/WO1996022454A1/fr
Publication of WO1996022454A1 publication Critical patent/WO1996022454A1/fr

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a rush adjuster for an internal combustion engine, and more particularly to a mechanical and direct drive lash adjuster having an automatic interval adjusting function.
  • a lash adjuster is known as a member that is directly interposed between a cam and a valve of an internal combustion engine and has a function of adjusting a distance between the cam and the valve when the motion of the cam is transmitted to the valve.
  • This type of rush adjuster There are two types of this type of rush adjuster, a mechanical type and a hydraulic type.
  • a mechanical type that does not require pressure control and has a relatively simple structure is relatively widely used.
  • a mechanical runner adjuster usually has a cylindrical baguette, and transmits the motion of the cam to the valve while the ceiling of the baguette slides on the cam.
  • Japanese Utility Model Laid-Open No. 48-69008 discloses an example of a solution to such a problem.
  • a hole perpendicular to the valve shaft is formed in a baguette, and
  • a panel and a wedge-shaped member are installed.
  • the wedge-shaped member When the tapered portion of the wedge-shaped member is in contact with the upper end of the valve shaft, and a gap is formed between the ceiling of the bucket and the cam, the wedge-shaped member resists the elastic force of the panel.
  • the gap between the ceiling and the cam is adjusted by sliding along the hole and changing the contact position between the tapered portion and the valve shaft.
  • a rotatable movable member is arranged on the ceiling of a bucket, and a spiral or spiral spring is interposed between the bucket and the movable member.
  • the spring urges the movable member so that it can rotate and move upward, and the movable member is coupled so that rotation in the direction opposite to the upward movement direction is impossible.
  • U.S. Pat. No. 3,038,640 discloses a push rod type rush adjuster as shown in FIG.
  • the rush adjuster shown in the figure is a hollow cylindrical body a having a closed upper end, a sleeve open at both ends which is slidably inserted into the body a, and a sliding movement within a sleeve b. It has a freely inserted plunger c whose upper end is closed.
  • a first teno portion d that expands upward is formed on the periphery of the opening on the upper end side of the sleeve b, and a second teno that expands downward is formed on the outer periphery of the lower end of the sleeve b.
  • the part e is formed.
  • a tapered surface f inclined downward from the center is formed.
  • the inclined surface f, the first tapered portion d, and the inner surface of the ceiling g of the body a are respectively formed.
  • the first rolling element h is interposed so as to contact.
  • a second rolling element j whose upper and lower surfaces are sandwiched by a pair of solid rings i is interposed so as to be in contact with the second tapered portion e and the inner peripheral surface of the body a, respectively.
  • the moving body j is locked from the lower end to the inner peripheral surface of the body a.
  • the spring k is always biased upward.
  • a ball bearing surface is provided on the lower end side of the plunger c, and the push rod 1 is in contact with the ball bearing surface.
  • a direct drive type lash adjuster is provided if a valve is brought into contact with the push rod 1 and a force is brought into contact with the upper surface of the ceiling g of the body a. It can also be used as a rush-adjacent evening. However, there was a problem described below in Lassi Yuadasu evening with such a configuration.
  • the present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a rigid connection state when necessary and to transmit the movement of the cam to the valve faithfully. It is an object of the present invention to provide a rush adjuster for an internal combustion engine, which can automatically adjust a clearance in response to expansion and contraction of a valve clearance due to a temperature change or wear. Disclosure of the invention
  • the present invention relates to a rush adjuster which is interposed between a valve and a cam of an internal combustion engine, wherein a ceiling portion of the lash adjuster contacts the cam.
  • a cylindrical bucket having a closed end, a plunger abutted on the upper end of the valve, and fitted in the bucket so as to be movable up and down, and interposed between an inner surface of a ceiling portion of the bucket and the plunger,
  • a shape is formed on the outer peripheral surface of the plunger so that a gap between the inner peripheral surface of the bucket and the outer peripheral surface of the plunger expands upwards, and a first elastic body to which a compression preload is applied in a prone state.
  • a plurality of rolling elements interposed between the tapered portion and the inner peripheral surface of the bucket.
  • the taper portion of the first invention is replaced with the plunger so that a space between an inner peripheral surface of the bucket and an outer peripheral surface of the plunger expands downward, A ring formed on the inner peripheral surface of the bucket and supporting the rolling element is fixed to the inner peripheral surface of the baguette.
  • a second elastic body that urges the rolling element in an expanding direction of the tapered portion can be provided.
  • a washer can be provided between the second elastic body and the rolling element.
  • an annular inner wall portion is provided on a lower surface side of the ceiling portion, and the plunger can be arranged on an inner circumferential side of the annular inner wall portion.
  • the taper portion has a plurality of taper grooves provided at intervals in a circumferential direction.
  • the tapered groove has a single circular arc cross section having a curvature larger than the curvature of the rolling element. It can be composed of any one section selected from a composite section, a V-shaped section, and a trapezoidal section with an arc surface having a curvature larger than the curvature of.
  • an arc-shaped groove facing the tapered portion is provided on a non-formed surface of the taper portion of the outer peripheral surface of the bucket and the outer peripheral surface of the plunger, and the arc-shaped groove has a curvature of the rolling element.
  • Single arc section with greater curvature, front It can be composed of any one of a composite cross section, a V-shaped cross section, and a trapezoidal cross section of an arc surface with a curvature larger than the curvature of the rolling element.
  • the tapered groove or the arc-shaped groove can be formed in a helical shape.
  • the first elastic body to which the compression preload is applied in the initial state is interposed between the top surface of the baguette and the plunger. While the ceiling is in contact with the cam, the cam and the packet ceiling are pressed against each other by the urging force of the first elastic body.
  • the gap between the inner peripheral surface of the bucket and the outer peripheral surface of the plunger is increased by a tapered portion formed on the outer peripheral surface of the plunger so as to expand upward. Since a plurality of rolling elements are interposed between the rolling elements, when the bucket is pressed down, the rolling elements move downward due to the frictional force between the rolling element bucket and the action of its own weight. The behavior is called initial slip).
  • the rolling element is interposed between the surfaces that contract downward, so that when the rolling element descends, the rolling element is inserted between the tapered portion and the inner peripheral surface of the bucket.
  • this state is referred to as a locked state.
  • the motion of the cam is faithfully transmitted to the valve via the bucket and the plunger.
  • the cam further rotates, the valve reaches the top dead center, the nose of the cam moves away from the bucket ceiling, and the base circle of the cam tries to contact the bucket. Then, the upward movement of the plunger in contact with the upper end of the valve stops.
  • the plunger stops moving upward and the base circle of the cam comes into contact with the baguette, the bucket moves slightly upward due to the elastic force of the contracted first elastic body.
  • the bucket and the plunger are unlocked.
  • the rolling element can be moved in the expanded direction by the elastic force of the second elastic body, the transition to the unlocked state can be performed reliably and quickly, and when the valve clearance becomes small, Compensation response can be performed quickly, and the compensation cost can be expanded.
  • the bucket has an annular inner wall portion on the lower surface side of the ceiling portion, and the plunger is disposed on the inner peripheral side of the annular inner wall portion.
  • the strength of the bucket ceiling can be reinforced by the annular wall.
  • the tapered portion has a plurality of tapered grooves provided at intervals in the circumferential direction, and the tapered groove has a curvature larger than the curvature of the rolling element.
  • the tapered groove has a single circular cross-section, a composite cross-section of a circular arc surface with a curvature greater than the curvature of the rolling element, a V-shaped cross section, or a trapezoidal cross section.
  • Contact is made at one or more points, preventing galling, ensuring the rotation of the rolling elements, and reducing the surface pressure.
  • the tapered portion faces the non-formed surface of the inner peripheral surface of the bucket and the outer peripheral surface of the plunger.
  • An arcuate groove having a radius of curvature greater than the radius of curvature of the rolling element, a cross section of a composite arc with a radius of curvature greater than the curvature of the rolling element, a V-shaped cross section, Since it is composed of any one of the trapezoidal cross sections, the surface pressure can be further reduced.
  • the tapered groove or the circular arc shape is formed in a helical shape, so that the rolling element is forcibly rotated with the vertical movement of the plunger, and the rolling element is rotated. In addition to preventing galling of the moving body, the moving distance of the rolling body is longer than that of the linear groove, and wear between the rolling body and the groove is reduced.
  • FIG. 1 is a general layout diagram showing a first embodiment of a lash adjuster according to the present invention.
  • FIG. 2 is an enlarged view of a main part of FIG.
  • FIG. 3 is a horizontal sectional view of FIG.
  • FIG. 4 is an overall layout diagram showing a second embodiment of the rush age according to the present invention.
  • FIG. 5 is an enlarged view of a main part of FIG.
  • FIG. 6 is a horizontal sectional view of FIG.
  • FIG. 7 is an overall arrangement diagram showing a third embodiment of the rush age according to the present invention.
  • FIG. 8 is an enlarged view of a main part of FIG.
  • FIG. 9 is a cross-sectional view showing a fourth embodiment of the rush age according to the present invention.
  • FIG. 10 is a horizontal sectional view of FIG.
  • FIG. 11 is an overall layout diagram showing a fifth embodiment of the rush age according to the present invention.
  • Fig. 12 is an enlarged drawing of the main part of Fig. 11
  • FIG. 13 is a cross-sectional view showing a sixth embodiment of the rush age according to the present invention.
  • FIG. 14 is a cross-sectional view showing a seventh embodiment of the rush age according to the present invention.
  • FIG. 15 is a cross-sectional view showing a modification of the cross-sectional shape of the taper groove or the arc-shaped groove of the present invention.
  • FIG. 16 is a cross-sectional view of a main part showing an example of a conventional rush age.
  • FIG. 1 to FIG. 3 show a first embodiment of a rush adjuster for an internal combustion engine according to the present invention.
  • a rush adjuster 10 shown in the figure is directly interposed between a valve of an internal combustion engine, for example, an exhaust valve 12 and a cam 14.
  • the exhaust valve 12 has an umbrella portion 12a and a shaft portion 12b, and the exhaust valve 12 moves up and down via a sleeve 16 fitted to the shaft portion 12b. It is freely supported, and a return panel 15 is interposed on the outer periphery of the shaft portion 12b.
  • the umbrella section 12a of the exhaust valve 12 opens or closes the exhaust port of the combustion chamber, with its rear side being in contact with or separated from the valve sheet 18, and the exhaust port has:
  • An exhaust passage 20 is formed in communication.
  • the cam 14 is rotatably driven in accordance with the operation of the internal combustion engine, and includes a base circular portion 14a and a nose portion 14b.
  • the rush adjuster 10 has a bucket 22, a plunger 24, a first elastic body 26, and a rolling element 28.
  • the bucket 22 has an annular outer wall portion 220 having an open lower end, and a ceiling portion 221, which is provided to close the upper end of the outer wall portion 220. The upper end is closed. It is formed in a hollow cylindrical shape.
  • the upper end of the exhaust valve 12 is in contact with the plunger 24, and the plunger 24 is vertically movable within the baguette 22.
  • the plunger upper guide 32 is formed in the shape of an inverted hatch B, and has a hollow cylindrical portion 320 provided at the center and having both ends opened, and an integral upper end of the hollow cylindrical portion 320.
  • the outer periphery of the disk part 3 21 is in sliding contact with the outer peripheral surface of the outer wall part 220 of the bucket 22.
  • the plunger lower guide 34 has a generally hat-shaped overall shape, and includes a convex portion provided at a central portion thereof and a flange portion provided at an outer peripheral edge of a lower end of the convex portion. 4 1 and have. At the center of the convex portion 340, a concave portion 342 having an open upper end is formed, and a hollow cylindrical portion is formed in the concave portion 342.
  • the plunger upper guide 32 is attached to the lower guide 34 by fitting 32 0.
  • a tapered portion whose diameter decreases toward the upper end side is provided.
  • the first elastic body 26 is composed of a compression coil panel having a smaller elastic force than the return spring 15, and the upper end side is in contact with the inner surface of the ceiling 2 2 * 1 of the bucket 22, and The lower end is the recess of the plunger lower guide 3 4
  • the rolling elements 28 are, for example, steel balls and are arranged at equal angular intervals on the outer circumference of the tapered portion 343 of the plunger lower guide 34.
  • the member indicated by reference numeral 38 in FIG. 2 abuts against the outer peripheral side of the lower surface of the plunger lower guide 34, and this plunger lower guide 3
  • the upper end of the shaft portion 12 b of the exhaust valve 12 abuts on the lower surface side of the plunger lower guide 34, and the ceiling of the bucket 22.
  • the upper surface of the part 221 is arranged so as to be in contact with the cam 14. At this time, the rush adjuster 10 of this embodiment is installed in the following state.
  • the exhaust valve 12 closes the exhaust boat with its umbrella portion 12a, the return panel 15 is not operating, and the base circle of the cam 14 is located on the upper surface of the ceiling portion 22 1.
  • the portion 14a With the portion 14a in contact, the first elastic body 26 is compressed in the axial direction, and the elastic body 26 is set in a state where a preload is applied.
  • the rush adjuster 10 is set in such a state, since the compression preload is applied to the first elastic body 26, the baguette 22 and the plunger 24 are connected to the base circle portion of the cam 14. While the 14 a is in contact with the bucket ceiling portion 21, the cam 14 is in contact with the baguette ceiling portion 21 by the force of the first elastic body 26.
  • the gap between the inner peripheral surface of the bucket 22 and the outer peripheral surface of the plunger 24 is increased by a tapered portion 3 43 formed on the outer peripheral surface of the plunger 24 so as to expand upward. Since a plurality of rolling elements 28 are interposed between the inner peripheral surface of the bucket 22 and the baguette 2 2, when the baguette 2 2 is depressed, the rolling elements 28 cause a friction force between the rolling element 28 and the baguette 22. However, it moves downward by the action of its own weight (this kind of behavior of the rolling element is called initial slip).
  • the cam 14 further rotates, the exhaust valve 12 reaches the top dead center, the nose 14 b of the drum 14 intersects with the bucket ceiling 22 1, and the cam 14
  • the round portion 14 a tries to contact the bucket 22
  • the upward movement of the plunger 24 in contact with the upper end of the exhaust valve 12 stops.
  • the bucket is rejected by the elasticity of the contracted first elastic body 26. 22 moves up slightly.
  • the period in which the base circle portion 14 a of the cam 14 is in contact with the bucket ceiling portion 22 1 is the same as the baggage 22. While the plunger 24 is unlocked and the nose part 14 b of the cam 14 is in contact with the bucket ceiling part 22 1, the bucket 22 and the plunger 24 are To lock.
  • Rush Asia 10 which exhibits such behavior, when the valve shrinks due to temperature change, wear occurs between the cam 14 and the bucket ceiling 221, or the plunger If wear occurs between the valve shaft 24 and the valve shaft end and the valve clearance increases, the elasticity of the first elastic body 26 extends between the bucket 22 and the plunger 24. And ba Correction for the increase in the lube clearance is automatically performed, and the contact state between the bucket ceiling section 21 and the cam 14 and the contact state between the exhaust valve 12 and the plunger 24 are ensured.
  • the stroke in which the interval can be corrected by the first elastic body 26 can be changed by adjusting the elasticity of the first elastic body 26.
  • FIGS. 4 to 6 show a second embodiment of the rush age according to the present invention. Only the features of the second embodiment will be described below.
  • arc-shaped grooves 22.2 which extend linearly along the axial direction, are circumferentially spaced on the inner hermitage surface of the outer wall 220 of the bucket 22a. Are formed.
  • the cross section of the arc-shaped groove portion 222 is an arc cross section having a curvature slightly larger than the curvature of the rolling element 28, and the rolling element 28 and the arc-shaped groove portion 222 come into point contact. ing.
  • the tapered portion 3 4 3 of the plunger lower guide 3 4 a has a plurality of linear tapered grooves 3 4 4 at predetermined intervals in the circumferential direction, and has the same inclination angle as the tapered portion 3 4 3 Is provided.
  • the tapered groove 344 is disposed so as to face the arc-shaped groove 222, and its cross-sectional shape is formed in an arc-shaped cross section having a curvature slightly larger than the curvature of the rolling element 28. Part of the outer periphery of the moving body 28 comes into point contact with the groove 344.
  • the rolling element 28 has an arc-shaped groove 2 22 and a tapered groove 3 It is arranged in a state positioned between 4 and 4.
  • the same operation and effect as those of the first embodiment can be obtained, and in this embodiment, the taper groove with which the rolling element 28 comes into contact is provided. Since 3 4 4 and the arc-shaped groove 2 2 2 are formed in an arc-shaped cross section having a curvature larger than that of the rolling element 28, the rolling element 28 comes into contact with the grooves 3 4 4 and 2 2 2 Sometimes, the contact state between them becomes a point contact, and the rotation of the rolling element can be secured while preventing the galling, and the surface pressure can be reduced.
  • FIGS. 7 and 8 show a third embodiment of the rush age according to the present invention. Only the features of the third embodiment will be described below.
  • a second elastic body 30 that urges the rolling element 28 in the expanding direction of the tapered portion 343 is provided.
  • the second elastic body 30 is formed in a ring shape having a through hole through which the convex portion 34 of the banja lower guide 34 can pass, and for example, a wave washer bent in a waveform is employed. It is mounted on the flange section 34 1 of the guide Branjaroi 34.
  • the washer 36 is placed on the upper surface side of the second elastic body 30, and the rolling element 28 is placed on the washer 36.
  • the washer 36 is provided to uniformly transmit the elastic force of the second elastic body 30 to the rolling element 28.
  • the washer 36 must be provided. Need to be provided.
  • the washer 36 is provided between the second elastic body 30 and the rolling element 28, the elastic force of the second elastic body 30 8 can be evenly received.
  • annular inner wall portion 22 is provided inside the outer wall portion 220 of the bucket 22c.
  • the inner wall 2 23 has an opening at the lower end and an upper end integrally formed on the lower surface of the ceiling 2 21.
  • An arc-shaped groove 2 2 2 is formed on the inner peripheral surface at a predetermined interval in the circumferential direction. Is formed.
  • the plunger 24 has upper and mouth guides 32 and 34 in the same manner as in the first embodiment.
  • the plunger 24 and the first and second elastic bodies 26 and 3'0 and the The moving body 28 and the like have substantially the same structure as that of the second embodiment except that the size of ⁇ is different, and all these members are housed inside the inner wall portion 23. ⁇
  • the same effect as in the first embodiment can be obtained by the rush azimuth plate 10c configured as described above, and in the case of the present embodiment, the ceiling portion 2 2 1
  • An annular inner wall portion 2 23 is provided on the lower surface side of the inner wall portion, and a plunger 24 and the like are arranged on the inner peripheral side of the inner wall portion 23, so that the bucket 2 2 b
  • the strength of the ceiling 2 2 1 can be reinforced.
  • the plunger 24 and the like are smaller than those of the first embodiment, so that the whole can be reduced in weight.
  • FIGS. 11 and 12 show a fifth embodiment of the rush age according to the present invention, and only the features of the fifth embodiment will be described below. Same figure
  • the rush azimuth 1 Od shown in the figure is equivalent to the taper section 343 provided on the outer periphery of the convex section 34 of the plunger lower guide 34 in the first embodiment (taper section 224). It is formed on the inner peripheral surface side of the outer wall portion 220 of the bucket 22d.
  • the plunger 24 d is composed of one part, and has a substantially cup-shaped main body 2 41 having an open upper end, and an annular projection 2 4 protruding from the center of the lower surface of the main body 2 4 1. 2 and an arc-shaped groove 243 provided along the axial direction of the outer surface of the main body 241, and the first elastic body 26 is housed inside the main body 21.
  • the upper end of the exhaust valve 12 is in contact with the lower surface of the annular projection 24.
  • the tenon flap 2 24 provided on the outer wall 220 is formed such that the space between the outer flap 2 24 and the outer peripheral surface of the main body 24 1 of the plunger 24 d expands downward. ing.
  • the rolling element 28 is supported by a ring 40 fixed to the inner peripheral surface of the outer wall 220 of the bucket 22d.
  • the ring 40 has an annular main body 40b provided with a hole 40a in the center of which an annular projecting portion 242 is inserted and movably inserted vertically, and an upper surface of the annular main body 40b.
  • a ring-shaped projection 40c protruding from the side is provided, and the rolling element 28 is mounted on the ring-shaped projection 40c.
  • the same operation and effect as those of the above embodiment can be obtained.
  • the rolling element The rolling element 28 can be brought into the locked state at an early stage because the rolling element 28 moves downward by being pushed by the inclined surface of the tenon portion 2 24.
  • FIG. 13 shows a sixth embodiment of the rush age according to the present invention. Only the features of the sixth embodiment will be described below.
  • a step 2 2 5 provided on the upper end side of the tapered portion 2 24 of the bucket 2 2 e is shown.
  • FIG. 14 shows a seventh embodiment of the rush age according to the present invention. Only the features of the seventh embodiment will be described below.
  • an annular inner wall portion 22 is provided inside the outer wall portion 220 of the bucket 22 f. Further, a taper portion 224 and a step portion 225 are provided on the inner peripheral surface of the inner wall portion 223. The second elastic body 30 and the washer 36 are fitted and fixed to the step portion 225 similarly to the sixth embodiment. According to the rush age 1 of the seventh embodiment configured as described above, the same operational effects as those of the fourth embodiment shown in FIGS. 9 and 10 can be obtained.
  • FIG. 15 shows a modification of the cross-sectional shape of the taper groove 344 of the plunger and the arc-shaped groove 222 provided in the bucket shown in each embodiment of the present invention described above. The cross section shown in FIG.
  • FIG. 7A is a cross section of an arc surface having a curvature larger than the curvature of the rolling element 28
  • FIG. 7B is a V-shaped cross section
  • FIG. It has a trapezoidal cross section.
  • the tapered groove 344 or the arc-shaped groove 222 can be selected from these cross-sections instead of the arc-shaped cross-section having a curvature larger than the curvature of the rolling element 28 shown in the above embodiment.
  • the taper groove 344 and the arc-shaped groove 222 need not necessarily have the same cross-sectional shape, and may have a combination of different cross-sectional shapes.
  • the tapered groove 344 and the arc-shaped groove 222 are respectively linearly formed.
  • the present invention is not limited to this.
  • Either or both of these grooves 3 4 4 and 2 2 2 May be formed in a helical shape.
  • the rolling elements 28 are forcibly rotated as the plunger moves up and down, thereby preventing the rolling elements 28 from galling.
  • the moving distance of the rolling element 28 is longer than that of the straight diagonal groove, and wear between the rolling element 28 and the grooves 222, 344 is also reduced.
  • the lash adjuster for an internal combustion engine according to the present invention, it is possible to ⁇ become in a PM-coupled state when necessary, and faithfully transmit the motion of the cam to the valve.
  • the distance can be automatically adjusted for wear and tear of parts caused by sliding contact with the cam or opening and closing of the valve and expansion and contraction due to temperature change, which is useful in the valve train of an internal combustion engine. It will be.

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Cette invention concerne un rattrapeur de jeu (10) disposé entre une soupape d'échappement (12) et une came (14). Le rattrapeur de jeu (10) se compose d'une cloche (22), d'un poussoir (24), d'un premier corps élastique (26) et d'éléments roulants (28). La cloche (22) comporte une paroi externe (220) ainsi qu'une paroi supérieure (221), de manière à former un cylindre creux dont la partie supérieure est fermée. Le poussoir (24), qui se déplace verticalement à l'intérieur de la cloche (22), entre en butée contre l'extrémité supérieure de la soupape d'échappement (12), et dispose d'un guide supérieur (32) et d'un guide inférieur (34). Sur la circonférence externe du guide inférieur (34) se trouve une partie conique qui réduit le diamètre de celui-ci vers son extrémité supérieure. Le premier corps élastique (26) entre en butée avec la face interne de la paroi supérieure (221) de la cloche (22) sur l'extrémité supérieure de celle-ci, et par l'intermédiaire du guide inférieur (34) se trouvant à l'extrémité inférieure. Ce corps élastique (26) se trouve déjà dans un état préalable de compression. La partie conique est équipée de plusieurs éléments roulants (28).
PCT/JP1995/000054 1995-01-20 1995-01-20 Rattrapeur de jeu pour moteur a combustion interne WO1996022454A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95906493A EP0752516A1 (fr) 1995-01-20 1995-01-20 Rattrapeur de jeu pour moteur a combustion interne
PCT/JP1995/000054 WO1996022454A1 (fr) 1995-01-20 1995-01-20 Rattrapeur de jeu pour moteur a combustion interne

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Application Number Priority Date Filing Date Title
PCT/JP1995/000054 WO1996022454A1 (fr) 1995-01-20 1995-01-20 Rattrapeur de jeu pour moteur a combustion interne

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3593674B2 (ja) * 1998-08-10 2004-11-24 本田技研工業株式会社 エンジンにおけるバルブ開閉機構

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038460A (en) * 1961-03-13 1962-06-12 Stanley Mikina Valve gear tappet for internal combustion engines
JPS61502553A (ja) * 1984-06-27 1986-11-06 ジ−ケイエヌ・テクノロジ−・リミテッド 自動クリアランス・アジャスタ
JPH04100005U (fr) * 1991-01-31 1992-08-28

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038460A (en) * 1961-03-13 1962-06-12 Stanley Mikina Valve gear tappet for internal combustion engines
JPS61502553A (ja) * 1984-06-27 1986-11-06 ジ−ケイエヌ・テクノロジ−・リミテッド 自動クリアランス・アジャスタ
JPH04100005U (fr) * 1991-01-31 1992-08-28

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