WO1996022454A1 - Lash-adjuster for an internal combustion engine - Google Patents

Lash-adjuster for an internal combustion engine 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
French (fr)
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 PCT/JP1995/000054 priority Critical patent/WO1996022454A1/en
Priority to EP95906493A priority patent/EP0752516A1/en
Publication of WO1996022454A1 publication Critical patent/WO1996022454A1/en

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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)
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Abstract

A lash-adjuster (10) is interposed between an exhaust valve (12) and a cam (14). The lash-adjuster (10) has a bucket (22), a plunger (24), a first elastic body (26), and rolling elements (28). The bucket (22) has an external wall portion (220) and a ceiling portion (221) and is formed substantially into a hollow cylinder which is closed at an upper end thereof. The plunger (24) is brought into abutment with an upper end of the exhaust valve (12) and vertically movably disposed in the bucket (22), and has an upper guide (32) and a lower guide (34). A tapered portion is formed around the outer circumference of the lower guide (34) in such a manner that the diameter thereof is reduced toward an upper end thereof. The first elastic body (26) is brought into abutment with an internal surface of the ceiling portion (221) of the bucket (22) at an upper end thereof and with the lower guide (34) at a lower end thereof, and is disposed in a state in which it is compressed in advance. A plurality of rolling elements (28) are disposed at the tapered portion.

Description

明 細 書 内燃機関用ラッシュアジヤスタ 技術分野  Description Rush adjuster for internal combustion engine Technical field
この発明は、 内燃機関用のラッシュアジヤス夕に関し、 特に、 自動間 隔調整機能を備えた機械式であつてかつ直接駆動方式のラッシュアジャ ス夕に関する。 背景技術  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. Background art
内燃機関のカムと弁との間に直接介装され、 カムの運動を弁に伝達す る際に、 これらの間の間隔調整機能を有する部材としてラッシュアジャ ス夕が知られている。 この種のラッシュアジヤス夕には、 機械式と油圧 式との 2種類があり、 圧力制御が不要で、 構造が比較的簡単な機械式の ものが、 比較的広く採用されている。 機械式のラッンュ尸ジャスタは、 通常、 円筒状のバゲットを有していて、 このバゲットの天井部をカムに 摺接した状態で、 カムの運動を弁に伝達している。  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. 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.
ところが、 このようにバゲットの天井部をカムに摺接させると、 カム とバケツト天井部との間に磨耗が発生するとともに、 バケツト内面がバ ルブ軸端部とも接触しているので、 この部分にも磨耗が発生し、 バルブ クリアランスが大きくなつて、 弁を完全に開弁することができなくなつ たり、 あるいは、 バルブシート部とバルブフヱース部との間の磨耗によ り、 同様に弁を完全に閉弁することができなくなる。  However, when the ceiling of the baguette is brought into sliding contact with the cam in this way, wear occurs between the cam and the bucket ceiling, and the inner surface of the bucket is also in contact with the end of the valve shaft. Wear can also occur, increasing the valve clearance and preventing the valve from fully opening, or the wear between the valve seat and the valve face can cause the valve to become completely The valve cannot be closed.
このような問題に対して、 例えば、 実開昭 4 8 - 6 5 9 0 8号公報に は、 その解決手段の一例が開示されている。 この公報に示されているラ ッシュアジャスタは、 バゲットに弁軸と直交する孔を穿設し、 この孔内 に、 パネと楔状部材を設置している。 For example, Japanese Utility Model Laid-Open No. 48-69008 discloses an example of a solution to such a problem. In the lash adjuster disclosed in this publication, a hole perpendicular to the valve shaft is formed in a baguette, and In addition, a panel and a wedge-shaped member are installed.
楔状部材は、 その傾斜したテ一パ部が弁軸の上端に当接していて、 バ ケットの天井部とカムとの間に隙間が発生すると、 楔状部材をパネの弾 発力に抗して、 孔に沿って摺動移動させて、 テーパ部と弁軸との当接位 置を変えることで、 天井部とカムとの間の間隔を調整する。  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.
このような構成のラッシュアジヤス夕によれば、 磨耗による間隔調整 を自動的に行なうことは不可能で、 例えば、 定期点検の際にエンジンの へッドカバーを取外し、 工具を使用して調整をしなければならない上に 、 温度変化に対するカムと弁との間の間隔変化に対処することができな いため、 必要以上に大きなバルブクリアランスをとらなければならなか つた。 そこで、 例えば、 特開昭 5 5 - 1 3 1 5 1 3号公報には、 温度変 化に伴つて発生する間隔変化を調整することができるラッシュアジヤス 夕が提案されている。  According to this type of lash adjuster, it is not possible to automatically adjust the spacing due to wear.For example, during regular inspections, the engine head cover must be removed and adjusted using a tool. In addition, it is not possible to cope with a change in the space between the cam and the valve due to a temperature change, so that a larger valve clearance than necessary must be taken. Therefore, for example, Japanese Patent Application Laid-Open No. 55-131153 proposes a rush adjuster that can adjust a change in an interval generated due to a change in temperature.
この公報に開示されているラッシャアジヤス夕は、 バケツ卜の天井部 に回転可能な可動部材を配度し、 バケツトと可動部材との間にスパイラ ルないしは渦巻き状バネを介装している。 バネは、 可動部材が回転して 上方に移動できるように付勢しており、 可動部材は、 この上方移動する 方向と逆方向への回転が不能に結合されている。  In the lasher tire disclosed in this publication, 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.
しかしながら、 この公報に開示されているラッシュアジャス夕にも、 以下に説明する技術的課題があつた。  However, the rush adjuster disclosed in this publication also had the following technical problems.
すなわち、 カムの運動を弁に伝達するラッシュアジヤス夕では、 カム ノ一ズがバゲットの天井部に措接し、 弁を開弁する際には、 カムの運動 を忠実に弁に伝達しなければ、 内燃機関の運転制御に支障を来す。 そこ で、 このような状態で運動を伝達する際には、 ラッシュアジヤス夕が力 ムと弁との間を剛結合させる必要があって、 このため、 上記公報に開示 されているラッシュアジヤス夕でも可動部材を逆方向回転不能に結合さ せて、 剛結合になるようにしいる。 In other words, in the rush age when the cam movement is transmitted to the valve, the cam must touch the baguette ceiling, and when the valve opens, the cam movement must be faithfully transmitted to the valve. The operation control of the internal combustion engine is hindered. Therefore, when transmitting motion in such a state, it is necessary for the rush adjuster to make a rigid connection between the force and the valve, and therefore, the rush adjuster disclosed in the above publication is required. Even in the evening, the movable member is To make a rigid connection.
ところが、 このような構成を採用すると、 ネジ部で大きな打音が生じ たり、 また、 弁が温度変化により収縮した場合や、 カムとバゲット天井 部との間に磨耗が発生したり、 あるいは、 バゲット内面とバルブ軸端部 との間に磨耗が発生し、 バルブクリアランスが大きくなった場合には、 可動部材が上方移動して、 カムと弁との間の間隔調整はできるが、 弁が 温度変化により伸長した場合や、 バルブシート部とバルブフユース部と の間に磨耗が発生した場合には、 可動部材がネジの遊び分以上下方に移 動することができないので、 カムと弁との間の間隔調整ができなくなり 、 その結果、 弁を完全に閉弁させることができなくなるという問題があ つ 7こ o  However, when such a configuration is adopted, a loud tapping sound is generated at the screw portion, the valve shrinks due to a temperature change, wear occurs between the cam and the baguette ceiling, or If the valve clearance increases due to wear between the inner surface and the end of the valve shaft, the movable member moves upward and the distance between the cam and the valve can be adjusted, but the temperature of the valve changes. In the event that the movable member cannot be moved downward by more than the play of the screw, the gap between the cam and the valve will not be able to move. There is a problem that adjustment cannot be performed, and as a result, the valve cannot be completely closed.
一方、 米国特許第 3 0 3 8 4 6 0号明細書には、 第 1 6図に示すよう な、 プッシュロッド式のラッシュアジヤス夕が開示されている。 同図に 示すラッシュアジヤス夕は、 上端が閉止された中空円筒状のボディ aと 、 このボディ a内に摺動移動自在に挿入された両端が開口したスリーブ と、 スリーブ b内に摺動移動自在に挿入された上端が閉止されたブラ ンジャ cとを有している。  On the other hand, 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.
スリーブ bの上端側の開口周縁には、 上方に向けて拡開する第 1テー ノ部 dが形成されるとともに、 スリーブ bの下端外周には、 下方に向け て拡開する第 2テーノ、'部 eが形成されている。 また、 プランジャ cの上 端側には、 中心から下方に向けて傾斜するテーパ面 fが形成されていて 、 この傾斜面 f と第 1テーパ部 dおよびボディ aの天井部 gの内面とに それぞれ接触するようにして第 1転動体 hが介装されている。  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. At the upper end of the plunger c, 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.
一対のソリッドリング iで上下面が挟持された第 2転動体 jが、 第 2 テーパ部 eとボディ aの内周面とにそれぞれ接触するようにして介装さ れていて、 この第 2転動体 jは、 下端側からボディ aの内周面に係止さ れたスプリング kにより常時上方に付勢されている。 プランジャ cの下 端側には、 球座面が設けられていて、 この球座面にプッシュロッド 1が 当接している。 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.
このような構成のブッシュロッド式のラッシュアジヤスタは、 プッシ ュロッド 1に代えて弁を当接させるとともに、 ボディ aの天井部 gの上 面に力ムが当接するようにすれば、 直接駆動式のラッシュアジヤス夕と しても使用することができる。 しかしながら、 このような構成のラッシ ユアジャス夕には、 以下に説明する問題があった。  In the bush rod type lash adjuster having such a configuration, 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.
すなわち、 第 1 6図のラッシュアジヤス夕では、 バルブクリアランス が大きくなつた場合には、 スリーブ bがスプリング kの弾発力により上 方移動して、 カムと弁との間の間隔調整はできる。 ところが、 弁が温度 変化により伸長した場合や、 バルブシート部とバルブフェース部との間 に磨耗が発生した場合には、 スリーブ bが、 スプリング kで常時上方に 向けて付勢されている第 2転動体 jによりボディ aと剛結合されている ので、 下方に移動することができず、 この結果、 カムと弁との間の間隔 調整ができなくなり、 弁を完全に閉弁させることができなくなるという 問題があった。  In other words, in the rush-adjustment case shown in Fig. 16, when the valve clearance increases, the sleeve b moves upward due to the elastic force of the spring k, and the distance between the cam and the valve can be adjusted. . However, when the valve elongates due to a change in temperature, or when wear occurs between the valve seat and the valve face, the sleeve b is constantly urged upward by the spring k. Since it is rigidly connected to the body a by the rolling element j, it cannot move downward.As a result, the distance between the cam and the valve cannot be adjusted, and the valve cannot be completely closed. There was a problem.
本発明は、 このような従来の問題点に鑑みてなされたものであつて、 その目的とするところは、 必要なときに剛結合状態になって、 カムの運 動を忠実に弁に伝達することができるとともに、 温度変化や磨耗に伴う バルブクリアランスの伸縮に対して、 自動的に間隔調整ができる内燃機 関用ラッシュアジヤス夕を提供することにある。 発明の開示  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
上記目的を達成するため、 本発明は、 内燃機関の弁とカムとの間に介 装されるラッシュアジヤス夕において、 天井部が前記カムに当接する上 端が閉止した筒状のバケツトと、 前記弁上端側が当接し、 前記バケツト 内に上下移動自在に嵌着されたプランジャと、 前記バケツトの天井部内 面と前記プランジャとの間に介装され、 初期伏態で圧縮予圧が加えられ る第 1弾性体と、 前記バケツトの内周面と前記プランジャの外周面との 間の間隔が上方に向けて拡開するように、 前記ブランジャの外周面に形 成されたテ一バ部と、 このテーパ部と前記バケツトの内周面との間に介 装される複数の転動体とを有することを特徴とする。 In order to achieve the above object, 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. And a plurality of rolling elements interposed between the tapered portion and the inner peripheral surface of the bucket.
また、 別の発明として、 上記第一発明のテーバ部を、 前記バケツトの 内周面と前記ブランジャの外周面との間の間隔が下方に向けて拡開する ように、 前記ブランジャに代えて、 前記バケツトの内周面に形成し、 前 記転動体を支持するリングを前記バゲットの内周面に固設したことを特 徴とする。  Further, as another invention, 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.
上記発明では、 前記転動体を前記テーパ部の拡開方向に付勢する第 2 弾性体を設けることができる。  In the above invention, a second elastic body that urges the rolling element in an expanding direction of the tapered portion can be provided.
この場合、 前記第 2弾性体と前記転動体との間に座金を設けることが できる。 また、 前記バゲ、タトは、 前記天井部の下面側に環状内壁部が 設けられ、 この環伏内壁部の内周側に前記ブランジャを配置することが できる。  In this case, a washer can be provided between the second elastic body and the rolling element. In addition, in the bage and the tatto, 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.
さらに、 前記テーバ部は、 周方向に間隔をおいて設けられた複数のテ 一バ溝を有し、 このテーパ溝は、 前記転動体の曲率よりも大きな曲率の 単一円弧断面， 前記転動体の曲率よりも大きな曲率の円弧面を複合した 断面， V字形断面， 台形断面から選択したいずれか 1つの断面て構成す ることができる。  Further, 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.
また、 前記バケツトの內周面と前記プランジャの外周面のうち前記テ ーパ部の非形成面に、 このテーパ部と対向する円弧状溝部を設け、 この 円弧状溝部は、 前記転動体の曲率よりも大きな曲率の単一円弧断面， 前 記転動体の曲率よりも大きな曲率の円弧面を複合した断面， V字形断面 , 台形断面から選択したいずれか 1つの断面で構成することができる。 さらに、 前記テーパ溝または円弧状溝は、 ヘリカル状に形成すること ができる。 Further, 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. Further, the tapered groove or the arc-shaped groove can be formed in a helical shape.
上記構成の内燃機関用ラッシュアジャス夕によれば、 初期状態で圧縮 予圧が加えられる第 1弾性体がバゲットの天井部內面とプランジャとの 間に介装されているので、 カムのベース円とバケツト天井部とが接触し ている期間中は、 カムとパケット天井部とが、 この第 1弾性体の付勢力 により圧接している。  According to the lash adjuster for an internal combustion engine having the above configuration, 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.
そして、 カムが回転して、 カムのノーズがパケット天井部に接触する 状態になると、 第 1弾性体を若干収縮させて、 バケツ卜が押し下げられ る。  When the cam rotates and the nose of the cam comes into contact with the packet ceiling, the first elastic body is slightly contracted, and the bucket is pushed down.
このとき、 バケツトの内周面とプランジャの外周面との間の間隔が、 上方に向けて拡開するようにプランジャの外周面に形成されたテ一バ部 と、 バケツ卜の内周面との間に複数の転動体が介装されているので、 バ ケットが押し下げられると、 転動体 バケツトとの間の摩擦力と、 自 重の作用により、 下方に移動する （このような転動体の挙動を初期滑り と称する） 。  At this time, 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).
この場合、 転動体は、 下方に向かって収縮する面間に介装されている ので、 転動体が下降すると、 転動体は、 テーパ部とバケツ卜の内周面と の間に嚙み込むようになり、 この結果、 バゲットとプランジャとが転動 体を介して剛結合 （以下、 この状態をロック状態と称する） する。 ， このようなロック状態になると、 カムの運動がバケツトおよびプラン ジャを介して弁に忠実に伝達される。  In this case, 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. As a result, the baguette and the plunger are rigidly connected via a rolling element (hereinafter, this state is referred to as a locked state). In such a locked state, the motion of the cam is faithfully transmitted to the valve via the bucket and the plunger.
一方、 カムがさらに回転して、 弁が上死点に到達し、 カムのノーズが バケツ卜天井部から離間し、 カムのベース円がバケツトに接触しようと すると、 弁の上端側に当接しているブランジャの上方への移動が停止す る。 ブランジャの上方移動が停止し、 カムのベース円がバゲットに接触 したときには、 収縮されていた第 1弾性体の弾発力により、 バケツトが 若干上昇移動する。 On the other hand, 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. When 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.
このようにしてバケツトが上昇移動すると、 テーパ部とバケツトの内 周面との間に嚙み込んでいた転動体は、 嚙み込み状態が解除され、 この 結果、 ロック状態が解除されて、 バゲットとプランジャとがアンロック 状態になる。  When the bucket rises in this way, the rolling element that has been inserted between the tapered portion and the inner peripheral surface of the bucket is released from the inserted state, and as a result, the locked state is released and the baguette is released. And the plunger are unlocked.
つまり、 本発明のラッシュアジヤス夕によると、 カムのベース円とバ ケット天井部とが接触している期間は、 バケツトとプランジャとがアン ロック伏態になるとともに、 カムのノーズとバケツト天井部とが接触し ている期間は、 バケツトとプランジャとが転動体を介してロック状態に なる。 ·  That is, according to the rush age of the present invention, while the base circle of the cam and the bucket ceiling are in contact with each other, the bucket and the plunger are unlocked and the nose of the cam and the bucket ceiling are in an unlocked state. During this period, the bucket and the plunger are locked via the rolling elements. ·
このような挙動を示すラッシュアジヤス夕によると、 弁が温度変化に より収縮した場合や、 カムとバケツト天井部との間に磨耗が発生したり' 、 あるいは、 ブランジャとバルブ軸端部との間に磨耗が発生し、 バルブ クリアランスが大きくなった場合には、 第 1弾性体の弾発力によりバゲ ットとプランジャとの間が伸びて、 バルブクリアランスの増加に対する 補正が自動的に行なわれ、 バケツト天井部とカムとの当接伏態および弁 とプランジャとの当接状態が確保される。  According to the rush age, which exhibits such behavior, when the valve shrinks due to a temperature change, wear occurs between the cam and the bucket ceiling, or the gap between the plunger and the valve shaft end If the valve clearance increases due to wear during the interval, the elasticity of the first elastic body extends between the baguette and the plunger, and the increase in valve clearance is automatically corrected. As a result, the abutment state between the bucket ceiling and the cam and the abutment state between the valve and the plunger are ensured.
一方、 弁が温度変化により伸長した場合や、 バルブシート部とバルブ フェース部との間に磨耗が発生し、 バルブクリアランスが小さくなつた 場合には、 第 1弾性体の弾発力に抗して、 バケツトとブランジャとの間 が縮み、 同様にバルブクリアランスの減少に対する補正が自動的に行な われ、 バケツ卜の天井部とカムとの当接伏態および弁とブランジャとの 当接状態が確保される。 以上の作用効果は、 バケツトの內周面とプランジャの外周面との間の 間隔が下方に向けて拡開するようなテーパ部を、 プランジャに代えて、 バケツ卜の内周面に形成し、 転動体を支持するリングをバケツ卜の内周 面に固設した場合にも得られる。 On the other hand, if the valve elongates due to temperature changes, or if the valve clearance is reduced due to wear between the valve seat and the valve face, the elasticity of the first elastic body will be reduced. The gap between the bucket and the plunger shrinks, and the valve clearance is similarly automatically compensated for the decrease in valve clearance, ensuring the contact state between the bucket ceiling and the cam and the valve and the plunger. Is done. The above operation and effect are as follows. Instead of the plunger, a taper portion is formed on the inner peripheral surface of the bucket such that the gap between the outer peripheral surface of the bucket and the outer peripheral surface of the plunger expands downward, It is also obtained when the ring supporting the rolling elements is fixed to the inner peripheral surface of the bucket.
また、 請求の範囲第 3項の構成によれば、 転動体をテーパ部の拡開方 向に付勢する第 2弾性体を設けているので、 バケツ卜とプランジャとが アンロック伏態になる際に、 第 2弾性体の弾発力により転動体を拡開し た方向に移動させることができ、 アンロック状態への移行が確実かつ迅 速に行なえ、 バルブクリアランスが小さくなった時の、 補正の応答が迅 速に行なえるとともに、 補正代の拡大が可能になる。  Further, according to the configuration of claim 3, since the second elastic body that urges the rolling element in the direction in which the tapered portion expands is provided, the bucket and the plunger are unlocked. In this case, 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.
さらに、 請求の範囲第 4項の構成によれば、 第 2弾性体と転動体との 間に座金を設けてレ、るので、 第 2弾性体の弾発力を各転動体に均一に受 けさせることができる。  Further, according to the configuration of claim 4, since a washer is provided between the second elastic body and the rolling element, the elastic force of the second elastic body is uniformly received by each rolling element. Can be disturbed.
さらにまた、 請求の範囲第 5項の構成によれば、 バケツトは、 天井部 の下面側に環状内壁部が設けられ、 この環状内壁部の内周側にプランジ ャを配置しているので、 この環状壁部によりバケツトの天井部の強度を 補強することができる。  Furthermore, according to the configuration of claim 5, 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.
また、 請求の範囲第 6項の構成によれば、 テーパ部は、 周方向に間隔' をおいて設けられた複数のテーパ溝を有し、 このテーバ溝は、 転動体の 曲率よりも大きな曲率の単一円弧断面， 転動体の曲率よりも大きな曲率 の円弧面を複合した断面， V字形断面， 台形断面から選択したいずれか 1つの断面を有しているので、 転動体とテーパ溝とが 1点ないしは複数 点で接触することになり、 かじり付きを防止しながら、 転動体の回転を 確保し、 しかも、 面圧を低下させることができる。  Further, according to the configuration of claim 6, 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. 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.
また、 請求の範囲第 7項の構成によれば、 バケツトの内周面と前記プ ランジャの外周面のうちテーパ部の非形成面に、 このテーパ部と对向す る円弧状溝部を設け、 この円弧状溝部は、 前記転動体 o曲率よりも大き な曲率の単一円弧断面， 前記転動体の曲率よりも大きな曲率の円弧面を 複合した断面， V字形断面， 台形断面から選択したいずれか 1つの断面 で構成されているので、 さらに一層面圧を低下させることができる。 また、 請求の範囲第 8項の構成によれば、 テーバ溝または円弧状 »は 、 ヘリカル状に形成されるので、 ブランジャの上下移動に伴って、 転動 体が強制的に回転させられ、 転動体のかじり付きが防止されるとともに 、 直線状の溝よりも転動体の移動距離が長くなり、 転動体と溝との間の 磨耗も少なくなる。 図面の簡単な説明 According to the configuration of claim 7, 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. In addition, according to the configuration of claim 8, 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. BRIEF DESCRIPTION OF THE FIGURES
第 1図は、 本発明にかかるラッシュアジャス夕の第 1実施例を示す全 体配置図である。 第 2図は、 第 1図の要部を拡大した図面である。 第 3 図は、 第 2図の水平断面図である。  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.
第 4図は、 本発明にかかるラッシュアジヤス夕の第 2実施例を示す全 体配置図である。 第 5図は、 第 4図の要部を拡大した図面である。 第 6 図は、 第 4図の水平断面図である。  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.
第 7図は、 本発明にかかるラッシュアジヤス夕の第 3実施例を示す全 体配置図である。 第 8図は、 第 7図の要部を拡大した図面である。 第 9図は、 本発明にかかるラッシュアジヤス夕の第 4実施例を示す断 面図である。 第 1 0図は、 第 9図の水平断面図である。  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.
第 1 1図は、 本発明にかかるラッシュアジヤス夕の第 5実施例を示す 全体配置図である。 第 1 2図は、 第 1 1図の要部を拡大した図面である 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
0 0
第 1 3図は、 本発明にかかるラッシュアジヤス夕の第 6実施例を示す 断面図である。 第 1 4図は、 本発明にかかるラッシュアジヤス夕の第 7実施例を示す 断面図である。 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.
第 1 5図は、 本発明のテ一パ溝ないしは円弧状溝の断面形状の変形例 を示す断面図である。  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.
第 1 6図は、 従来のラッシュアジヤス夕の一例を示す要部断面図であ な。 発明を実施するための最良の形態  FIG. 16 is a cross-sectional view of a main part showing an example of a conventional rush age. BEST MODE FOR CARRYING OUT THE INVENTION
以下本発明の好適な実施例について添附図面を参照して詳細に説明す る。 第 1図から第 3図は、 本発明にかかる内燃機関用ラッシュアジヤス 夕の第 1実施例を示している。 同図に示すラッシュアジヤス夕 1 0は、 内燃機関の弁、 例えば、 排気弁 1 2とカム 1 4との間に直接介装される 。 排気弁 1 2は、 傘部 1 2 aと、 軸部 1 2 bとを有していて、 軸部 1 2 bに嵌着されたスリーブ 1 6を介して、 排気弁 1 2は、 上下移動自在に 支持され、 軸部 1 2 bの外周には、 復帰パネ 1 5が介装されている。 排気弁 1 2の傘部 1 2 aは、 その背面側がバルブシ一ト 1 8と当接な いしは離間して、 燃焼室の排気ポートを開閉するものであって、 排気ポ ートには、 排気通路 2 0が連通形成されている。 カム 1 4は、 内燃機関 の運転に伴って回転駆動され、 ベース円部 1 4 aと、 ノーズ部 1 4 bと が設けられている。 ラッシュアジヤス夕 1 0は、 バケツト 2 2と、 ブラ ンジャ 2 4と、 第 1弾性体 2 6と、 転動体 2 8とを有している。  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 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.
バケツト 2 2は、 下端が開口した環状の外壁部 2 2 0と、 この外壁部 2 2 0の上端を閉止するように設けられた天井部 2 2 1とを有していて 、 上端が閉止した中空筒状に形成されている。  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.
プランジャ 2 4は、 排気弁 1 2の上端側が当接し、 バゲット 2 2内に 上下移動自在に配置されていて、 プランジャアッパーガイド 3 2と、 プ ランジャロワ一ガイド 3 4とから構成されている。 プランジャアッパー ガイド 3 2は、 B各逆ハツト状に形成されていて、 中央部に設けられた両 端が開口した中空筒部 3 2 0と、 この中空筒部 3 2 0の上端側に一体に 形成された円盤部 3 2 1とを有していて、 円盤部 3 2 1の外周緣がバケ ット 2 2の外壁部 2 2 0の內周面に摺接している。 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 and the plunger Ranjarova Guide 3-4. 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.
プランジャロワ一ガイド 3 4は、 全体形状が略ハツト伏に形成されて いて、 中央部に設けられた凸部 3 4 0と、 この凸部 3 4 0の下端外周縁 に設けられたフランジ部 3 4 1とを有している。 凸部 3 4 0の中心には 、 上端が開口した凹部 3 4 2が形成され、 この凹部 3 4 2内に中空筒部  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.
3 2 0を嵌着することにより、 プランジャアッパーガイド 3 2がロワ一 ガイド 3 4に組付けられている。  The plunger upper guide 32 is attached to the lower guide 34 by fitting 32 0.
また、 凸部 3 4 0の外周には、 上端側に向けて径が縮小するテーパ部  Also, on the outer periphery of the convex portion 340, a tapered portion whose diameter decreases toward the upper end side is provided.
3 4 3が形成されていて、 このテーパ部 3 4 3を設けることにより、 ノく ケット 2 2の外壁部 2 2 0の内周面と、 プランジャロワーガイド 3 4の · 外周面との間の間隔が、 上方に向かって拡開するように形成されている o  3 4 3 is formed, and by providing this tapered portion 3 4 3, the gap between the inner peripheral surface of the outer wall portion 220 of the bracket 22 and the outer peripheral surface of the plunger lower guide 34 is formed. The gap is formed to expand upwards o
第 1弾性体 2 6は、 本実施例では、 復帰バネ 1 5よりも弾発力が小さ い圧縮コイルパネから構成され、 上端側がバケツト 2 2の天井部 2 2* 1 の内面に当接し、 かつ、 下端側がブランジャロワーガイド 3 4の凹部 3 In the present embodiment, 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
4 2底面に当接するように、 かつ、 プランジャアッパーガイド 3 2の中 空筒部 3 2 0内を揷通するようにして配置されている。 4 2 It is arranged so as to be in contact with the bottom surface and to pass through the hollow cylindrical portion 320 of the plunger upper guide 32.
転動体 2 8は、 例えば、 鋼製の球であって、 プランジャロワ一ガイド 3 4のテーパ部 3 4 3の外周に等角度間隔で複数配置されている。 なお 、 第 2図中に符号 3 8で示した部材は、 ブランジャロワーガイド 3 4の 下面外周側に当接して、 このプランジャロワーガイト 3  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
1 1 訂正された用紙 （規則 91) 4などの脱落を防止するための止めリングである。 1 1 Corrected form (Rule 91) This is a retaining ring to prevent the 4 etc. from falling off.
さて、 以上のように構成されたラッシュアジヤス夕 1 0は、 排気弁 1 2の軸部 1 2 bの上端がプランジャロワ一ガイド 3 4の下面側に当接し 、 かつ、 バケツト 2 2の天井部 2 2 1の上面がカム 1 4に当接するよう に配置するが、 この時、 本実施例のラッシュアジヤス夕 1 0では、 以下 の状態で設置される。  In the lash adjuster 10 configured as described above, 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.
すなわち、 まず、 排気弁 1 2は、 その傘部 1 2 aで排気ボートを閉塞 し、 復帰パネ 1 5が作用しておらず、 かつ、 天井部 2 2 1の上面にカム 1 4のベース円部 1 4 aが当接した状態で、 第 1弾性体 2 6が軸方向に 圧縮されて、 この弾性体 2 6に予圧が加えられた状態にセットされる。 このような状態にラッシュアジヤス夕 1 0をセットすると、 第 1弾性 体 2 6に圧縮予圧が加えられているので、 バゲット 2 2とプランジャ 2 4とは、 カム 1 4のべ一ス円部 1 4 aとバケツト天井部 2 2 1とが接触 している期間中は、 カム 1 4とバゲット天井部 2 2 1と力 この第 1弾 性体 2 6の付势力により圧接している。  That is, first, 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. 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. When 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.
そして、 カム 1 4が回転して、 カム 1 4のノーズ部 1 4 bがバケツト 天井部 2 2 1に接触する状態になると、 第 1弾性体 2 6を若干収縮させ て、 バケツト 2 2が押し下げられる。  Then, when the cam 14 rotates and the nose portion 14 b of the cam 14 comes into contact with the bucket ceiling portion 21, the first elastic body 26 is slightly contracted, and the bucket 22 is pushed down. Can be
このとき、 バケツト 2 2の内周面とブランジャ 2 4の外周面との間の 間隔が、 上方に向けて拡開するようにプランジャ 2 4の外周面に形成さ れたテーパ部 3 4 3と、 バケツト 2 2の内周面との間に複数の転動体 2 8が介装されているので、 バゲット 2 2が押し下げられると、 転動体 2 8は、 バゲット 2 2との間の摩擦力と、 自重の作用により、 下方に移動 する （このような転動体の挙動を初期滑りと称する） 。  At this time, 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).
この場合、 転動体 2 8は、 下方に向かって収縮する面間に介装されて いるので、 転動体 2 8が下降すると、 転動体 2 8は、 テーパ部 3 4 3と バゲット 2 2の內周面との間に噸み込むようになり、 この結果、 バケツ ト 2 2とプランジャ 2 4とが転動体 2 8を介して剛結合 （以下、 この状 態をロック状態と称する） する。 In this case, since the rolling element 28 is interposed between the surfaces that contract downward, when the rolling element 28 descends, the rolling element 28 becomes a tapered portion 3 4 3 As a result, the bucket 22 and the plunger 24 are rigidly connected via the rolling element 28 (hereinafter, this state is referred to as a locked state). I will).
このようなロック状態になると、 カム 1 4の運動がバケツト 2 2およ びプランジャ 2 4を介して排気弁 1 2に忠実に伝達される。  In such a locked state, the movement of the cam 14 is faithfully transmitted to the exhaust valve 12 via the bucket 22 and the plunger 24.
一方、 カム 1 4がさらに回転して、 排気弁 1 2が上死点に到達し、 力 ム 1 4のノーズ部 1 4 bがバケツト天井部 2 2 1から雜間し、 カム 1 4 のべ一ス円部 1 4 aがバケツト 2 2に接触しょうとすると、 排気弁 1 2 の上端側に当接しているブランジャ 2 4の上方への移動が停止する。 プ ランジャ 2 4の上方移動が停止し、 カム 1 4のベース円部 1 4 aがバゲ ット 2 2に接触したときには、 収縮されていた第 1弾性体 2 6の弾発力 により、 バケツト 2 2が若干上昇移動する。  On the other hand, 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 When 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. When the upward movement of the plunger 24 stops and the base circle portion 14 a of the cam 14 comes into contact with the baguette 22, the bucket is rejected by the elasticity of the contracted first elastic body 26. 22 moves up slightly.
このようにしてバケツト 2 2が上昇移動すると、 テーバ部 3 4 3とバ ケット 2 2の内周面との間に嗨み込んでいた転動体 2 8は、 嘴み込み状 態が解除され、 この結果、 ロック状態が解除されて、 バゲット 2 2とプ ランジャ 2 4とがァンロック状態になる。  When the bucket 22 moves upward in this way, the rolling element 28 that has been inserted between the taper portion 34 3 and the inner peripheral surface of the bucket 22 is released from the beak state. As a result, the locked state is released, and the baguette 22 and the plunger 24 are unlocked.
つまり、 本実施例のラッシュアジヤス夕 1 0によると、 カム 1 4のべ 一ス円部 1 4 aとバケツト天井部 2 2 1とが接触している期間は、 バゲ ット 2 2とブランジャ 2 4とがアンロック状態になるとともに、 カム 1 4のノーズ部 1 4 bとバケツト天井部 2 2 1とが接触している期間は、 バケツト 2 2とプランジャ 2 4とが転動体を介してロック状態になる。 このような挙動を示すラッシュアジヤス夕 1 0によると、 弁が温度変 化により収縮した場合や、 カム 1 4とバケツト天井部 2 2 1との間に磨 耗が発生したり、 あるいは、 プランジャ 2 4とバルブ軸端部との間に磨 耗が発生し、 バルブクリアランスが大きくなつた場合には、 第 1弾性体 2 6の弾発力によりバケツト 2 2とプランジャ 2 4との間が伸びて、 バ ルブクリアランスの増加に対する補正が自動的に行なわれ、 バケツト天 井部 2 2 1とカム 1 4との当接状態および排気弁 1 2とプランジャ 2 4 との当接状態が確保される。 In other words, according to the rush age 10 of the present embodiment, 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. According to 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.
一方、 排気弁 1 2が温度変化により伸長した場合や、 バルブシート部 1 8とバルブフェース部 1 2 aとの間に磨耗が発生し、 バルブクリアラ ンスが小さくなつた場合には、 第 1弾性体 2 6の弾発力に杭して、 バゲ ット 2 2とブランジャ 2 4との間が縮み、 同様にバルブクリアランスの 滅少に対する補正が自動的に行なわれ、 、 バケツト 2 2の天井部 2 2 1 とカム 1 4との当接状態および排気弁 1 2とプランジャ 2 4との当接状 態が確保される。  On the other hand, if the exhaust valve 12 expands due to a temperature change, or if wear occurs between the valve seat portion 18 and the valve face portion 12a and the valve clearance decreases, the first elasticity is reduced. Pile to the resilience of the body 26, the space between the baguette 22 and the plunger 24 shrinks, as well as automatically compensate for the decrease in valve clearance, and the ceiling of the bucket 22 The contact state between the section 22 1 and the cam 14 and the contact state between the exhaust valve 12 and the plunger 24 are ensured.
なお、 第 1弾性体 2 6による間隔補正が可能なストロークは、 第 1弾 性体 2 6の弾発力を調整することにより変更することもできる。  It should be noted that 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.
第 4図から第 6図は、 本発明にかかるラッシュアジヤス夕の第 2実施 例を示しており、 以下にその特徴点についてのみ説明する。 同図に示す ラッシュアジャス夕 1 0 aでは、 バケツ ト 2 2 aの外壁部 2 2 0の内庵 面に、 軸方向に沿って直線状に延びる円弧状溝部 2 2· 2が周方向に間隔 をおいて複数形成されている。 この円弧状溝部 2 2 2の断面は、 転動体 2 8の曲率よりも僅かに大きな曲率の円弧断面となっていて、 転動体 2 8と円弧状溝部 2 2 2とが点接触するようになっている。  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. In the rush adjuster 10a shown in the same figure, 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.
—方、 プランジャロワ一ガイド 3 4 aのテーパ部 3 4 3には、 周方向 に所定の間隔をおいて複数の直線状テーパ溝 3 4 4力く、 テーパ部 3 4 3 と同じ傾斜角度で設けられている。  —On the other hand, 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.
このテーパ溝 3 4 4は、 円弧状溝部 2 2 2と対向するように配置され 、 その断面形状は、 転動体 2 8の曲率よりも僅かに大きな曲率の円弧断 面に形成されていて、 転動体 2 8の外周の一部がこの溝 3 4 4と点接触 するようになつている。 転動体 2 8は、 円弧状溝 2 2 2とテーパ状溝 3 4 4との間に位置決めされた状態で配置されている。 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.
このように構成されたラッシュアジヤス夕 1 0 aによると、 上記第 1 実施例と同等の作用効果が得られるとともに、 本実施例の場合には、 転 動体 2 8が接触するテ一パ溝 3 4 4と円弧状溝部 2 2 2とが、 転動体 2 8の曲率よりも大きな曲率の円弧状断面に形成されているので、 転動体 2 8が溝 3 4 4， 2 2 2と接触したときに、 これらの間の接触状憨がそ れぞれ点接触となり、 かじり付きを防止しながら、 転動体の回転を確保 し、 しかも、 面圧を低下させることができる。  According to the lash adjuster 10a configured as described above, 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.
第 7図および第 8図は、 本発明にかかるラッシュアジヤス夕の第 3実 施例を示しており、 以下にその特徴点についてのみ説明する。 同図に示 すラッシュアジヤス夕 1 0 bでは、 転動体 2 8をテーパ部 3 4 3の拡開 方向に付勢する第 2弾性体 3 0を設けている。 第 2弾性体 3 0は、 ブラ ンジャロワ一ガイド 3 4の凸部 3 4 0の揷通が可能な透孔を有するリン グ状に形成されていて、 例えば、 波形に屈曲したウェーブヮッシャなど が採用され、 ブランジャロワ一ガイド 3 4のフランジ部 3 4 1上に載置 されている。  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. In the rush adjuster 10b shown in the figure, 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.
そして、 この第 2弾性体 3 0の上面側に座金 3 6を載せて、 座金 3 6 上に転動体 2 8が載置されている。 座金 3 6は、 第 2弾性体 3 0の弾性 力を転動体 2 8に均一に伝達するために設けられており、 特に、 第 2弾 性体 3 0としてウェーブヮッシャを用いた場合には、 必ず設ける必要が める。  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. In particular, when a wave washer is used as the second elastic body 30, the washer 36 must be provided. Need to be provided.
このように構成したラッシュアジヤス夕 1 O bによっても上記第 1実 施例と同等の作用効果が得られるとともに、 本実施例の場合には、 バゲ ット 2 2が押し下げられると、 転動体 2 8が第 2弾性体 3 0を圧縮する ようにして下方に移動し、 転動体 2 8がアンロック状態になるときに、 転動体 2 8が第 2弾性体 3 0の弾発力により、 テーパ部 3 4 3の拡開方 向、 すなわち、 上方に押上られるので、 アンロック状態への移行が確実 かつ迅速に行なえ、 バルブクリアランスが小さくなった時の、 補正の応 答が迅速に行なえるとともに、 補正代の拡大が可能になる。 The same effect as that of the first embodiment can be obtained with the rush yard 1Ob thus configured, and in this embodiment, when the baguette 22 is pushed down, When the rolling element 28 moves downward so as to compress the second elastic body 30 and the rolling element 28 is unlocked, the rolling element 28 is moved by the elastic force of the second elastic body 30. , How to expand the tapered part 3 4 3 Direction, i.e., upward, so that the shift to the unlocked state can be performed reliably and quickly, and when the valve clearance becomes small, the response to the correction can be made quickly and the compensation allowance can be expanded. Become.
また、 本実施例の構成によれば、 第 2弾性体 3 0と転動体 2 8との間 に座金 3 6を設けているので、 第 2弾性体 3 0の弾発力を各転動体 2 8 に均一に受けさせることができる。  Further, according to the configuration of the present embodiment, since 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.
第 9図および第 1 0図は、 本発明にかかるラッシュアジヤス夕の第 4 実施例を示しており、 以下にその特徴点についてのみ説明する。 同図に 示す実施例では、 バケツト 2 2 cの外壁部 2 2 0の内側に環状の内壁部 2 2 3を設けている。 この内壁部 2 2 3は、 下端側が開口し、 上端側が 天井部 2 2 1の下面側に一体に形成されていて、 その内周面に円弧状溝 部 2 2 2が周方向に所定の間隔をおいて形成されている。  9 and 10 show a fourth embodiment of the rush age according to the present invention. Only the features of the fourth embodiment will be described below. In the embodiment shown in the figure, an 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.
プランジャ 2 4は、 上記第 1実施例と同様にァッパーおよび口ワーガ イド 3 2， 3 4を有していて、 このブランジャ 2 4と第 1 , 第 2弾性体 2 6，. 3 '0および転動体 2 8などは、 ^の大きさが異なるだけで第 2実 施例と実質的に同じ構造になっていて、 これらの部材が全て内壁部 2 2 3の内部に収納されている。 ·  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. ·
このように構成されたラッシュアジヤス夕 1 0 cによっても上記第 1 実施例と同様な作用効果が得られるとともに、 本実施例の場合には、 ノく ケット 2 2 Cの天井部 2 2 1の下面側に環状の内壁部 2 2 3を設け、 こ の内壁部 2 2 3の内周側にブランジャ 2 4などを配置しているので、 こ の内壁部 2 2 3によりバケツト 2 2 bの天井部 2 2 1の強度を補強する ことができる。 また、 本実施例の場合には、 プランジャ 2 4などが第 1 実施例のものよりも小さくなり、 全体を軽量化することができる。  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. Further, in the case of the present embodiment, the plunger 24 and the like are smaller than those of the first embodiment, so that the whole can be reduced in weight.
第 1 1図および第 1 2図は、 本発明にかかるラッシュアジヤス夕の第 5実施例を示しており、 以下にその特徴点についてのみ説明する。 同図  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
1 6 1 6
訂正された用紙 （規則 91) に示すラッシュアジヤス夕 1 O dは、 第 1実施例でプランジャロワーガ イド 3 4の凸部 3 4 0外周に設けたテーバ部 3 4 3に相当するもの （テ ーパ部 2 2 4 ) を、 バケツト 2 2 dの外壁部 2 2 0の内周面側に形成し ている。 Corrected form (Rule 91) 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.
また、 ブランジャ 2 4 dは、 1つの部品から構成されていて、 上端が 開口した略カップ状の本体部 2 4 1と、 この本体部 2 4 1の下面中心に 突設した環状突起部 2 4 2と、 本体部 2 4 1の外面の軸方向に沿って設 けられた円弧状溝部 2 4 3とから構成されていて、 本体部 2 1の内部 側に第 1弾性体 2 6が収納され、 環状突起 2 4 2の下面に排気弁 1 2の 上端が当接している。  Further, 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.
外壁部 2 2 0に設けられたテーノく部 2 2 4は、 これとブランジャ 2 4 dの本体部 2 4 1の外周面との間の間隔が、 下方に向かって拡開するよ うに形成されている。 転動体 2 8は、 バケツト 2 2 dの外壁部 2 2 0の 内周面に固設されたリング 4 0により支持されている。  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.
リング 4 0は、 中心に環状突起部 2 4 2が、 上下移動自在の嵌挿入'さ れる孔部 4 0 aが設けられた環状の本体 4 0 bと、 この環状の本体 4 0 bの上面側に突設されたリング状突起 4 0 cとを有しており、 このリン グ状突起 4 0 c上に転動体 2 8が載置されている。  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.
このように構成されたラッシュアジヤスタ 1 O dによれば、 上記実施 例と同様な作用効果が得られるとともに、 特に、 本実施例の場合には、 バケツト 2 2 d力押し下げられると、 転動体 2 8がテーノく部 2 2 4の傾 斜面に押されて下方に移動するので、 転動体 2 8を早期にロック状態に することができる。  According to the lash adjuster 1 Od configured as described above, the same operation and effect as those of the above embodiment can be obtained. In particular, in the case of the present embodiment, when the bucket 22 d is pushed down, 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.
第 1 3図は、 本発明にかかるラッシュアジヤス夕の第 6実施例を示し ており、 以下にその特徴点についてのみ説明する。 同図に示す実施例で は、 バケツト 2 2 eのテーパ部 2 2 4の上端側に設けられた段部 2 2 5  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. In the embodiment shown in the figure, 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.
1 7 1 7
訂正された用紙 （規則 91) に、 座金 3 6と第 2弾性体 3 0とを嵌着固定し、 座金 3 6の下面側が転 動体 2 8と当接するように構成している。 Corrected form (Rule 91) In addition, the washer 36 and the second elastic body 30 are fitted and fixed to each other, so that the lower surface of the washer 36 comes into contact with the rolling element 28.
このように構成された第 6実施例のラッシュアジヤス夕 1 0 eによれ ば、 第 2弾性体 3 0の弾発力により転動体 2 8がテーバ部 2 2 4の拡開 側に下方移動するので、 第 7 , 8図に示した第 3実施例と同等の作用効 果が得られる。 第 1 4図は、 本発明にかかるラッシュアジヤス夕の第 7 実施例を示しており、 以下にその特徴点についてのみ説明する。  According to the rush adjuster 10e of the sixth embodiment configured as described above, the rolling element 28 moves downward to the expanding side of the taper section 224 by the elastic force of the second elastic body 30. Therefore, the same operational effects as those of the third embodiment shown in FIGS. 7 and 8 can be obtained. 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.
同図に示す実施例では、 バケツト 2 2 f の外壁部 2 2 0の内側に環状 の内壁部 2 2 3を設けている。 そして、 この内壁部 2 2 3の内周面にテ ーパ部 2 2 4と段部 2 2 5とが設けられている。 段部 2 2 5には、 上記 第 6実施例と同様に第 2弾性体 3 0と座金 3 6とが嵌着固定されている 。 このように構成された第 7実施例のラッシュアジヤス夕 1 O f による と、 第 9， 1 0図に示した第 4実施例と同等の作用効果が得られる。 第 1 5図は、 上述した本発明の各実施例に示したブランジャのテ一バ 溝 3 4 4およびバケツト設けた円弧状溝 2 2 2の断面形状の変形例を示 している。 同図 （A) に示した断面は、 転動体 2 8の曲率よりも大きな 曲率の円弧面を複合した断面であり、 同図 （B ) は、 V字形断面であり 、 同図 （C ) は、 台形の断面形状である。 ' テーパ溝 3 4 4または円弧状溝 2 2 2は、 上記実施例で示した転動体 2 8の曲率よりも大きな曲率の円弧状断面に代えてこれらの断面形伏を 選択することができる。 この場合、 テ一パ溝 3 4 4と円弧状溝 2 2 2と は、 必ずしも同じ断面形状にする必要はなく、 異なった断面形状の組み 合わせであってもよい。  In the embodiment shown in the figure, 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. 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, and 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. In this case, 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.
なお、 上記実施例では、 テーパ溝 3 4 4と円弧状溝 2 2 2とは、 それ ぞれ直線状に形成したものを例示したが、 本発明の実施はこれに限定さ れることはなく、 これらの溝 3 4 4， 2 2 2の何れか一方ないしは双方 をヘリカル状に形成することもできる。 これらの溝 3 4 4 , 2 2 2をへ リカル状に形成すると、 ブランジャの上下移動に伴って、 転動体 2 8が 強制的に回転させられ、 転動体 2 8のかじり付きが防止されるとともに 、 直棣状の溝よりも転動体 2 8の移動距離が長くなり、 転動体 2 8と溝 2 2 2 , 3 4 4との間の磨耗も少なくなる。 産業上の利用可能性 In the above embodiment, the tapered groove 344 and the arc-shaped groove 222 are respectively linearly formed. However, 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. When these grooves 3 4 4 and 2 2 2 are 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. However, 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. Industrial applicability
以上、 実施例で詳細に説明したように、 本発明にかかる内燃機関用ラ ッシュアジャス夕によれば、 '必要なときに PM結合状態になって、 カムの 運動を忠実に弁に伝達することができるとともに、 カムとの摺接ないし はバルブの開閉に伴って発生する部品の磨耗や温度変化に伴う伸縮に対 して、 自動的に間隔調整ができるので、 内燃機関の動弁系において有用 なものとなる。  As described above in detail in the embodiment, according to 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. In addition to this, 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.

Claims

請 求 の 範 囲 The scope of the claims
1 . 内燃機関の弁とカムとの間に介装されるラッシュアジヤス夕におい て、 1. During the rush aerial evening between the internal combustion engine valve and the cam,
天井部が前記カムに当接する上端が閉止した筒状のバゲットと、 前記弁上端側が当接し、 前記バケツト内に上下移動自在に嵌着された ブランジャと、  A cylindrical baguette having an upper end closed with a ceiling portion abutting on the cam; a plunger abutting on the valve upper end side and movably fitted in the bucket up and down;
前記バケツトの天井部内面と前記プランジャとの間に介装され、 初期 状態で圧縮予圧が加えられる第 1弾性体と、  A first elastic body interposed between an inner surface of a ceiling portion of the bucket and the plunger, to which a compression preload is applied in an initial state;
前記 ケットの内周面と前記ブランジャの外周面との間の間隔が上方 に向けて拡開するように、 前記ブランジャの外周面に形成されたテーパ 部と、  A taper portion formed on an outer peripheral surface of the plunger so that a gap between an inner peripheral surface of the bracket and an outer peripheral surface of the plunger expands upward;
このテーパ部と前記バケツトの内周面との間に介装される複数の転動 体とを有することを特徴とする内燃機関用ラッシュアジヤス夕。  A rush adjuster for an internal combustion engine, comprising a plurality of rolling elements interposed between the tapered portion and an inner peripheral surface of the bucket.
2 . 請求の範囲第 1項記載の内燃機関用ラッシュアジヤス夕において、 前記テーパ部を、 前記バケツトの内周面と前記プランジャの外周面と の間の間隔が下方に向けて拡開するように、 前記ブランジャに代えて、 前記バケツトの内周面に形成し、 前記転動体を支持するリングを前記バ ケットの内周面に固設したことを特徴とする内燃機関用ラッシュアジャ ス夕。  2. The lash adjuster for an internal combustion engine according to claim 1, wherein the tapered portion is expanded so that a distance between an inner peripheral surface of the bucket and an outer peripheral surface of the plunger is downward. A lash adjuster for an internal combustion engine, wherein a ring formed on an inner peripheral surface of the bucket and fixed to the inner peripheral surface of the bucket is formed on the inner peripheral surface of the bucket instead of the plunger.
3 . 前記転動体を前記テ一パ部の拡開方向に付勢する第 2弾性体を設け たことを特徴とする請求の範囲第 1項または第 2項に記載の内燃機関用 ラッシュアジヤス夕。  3. A rush adjuster for an internal combustion engine according to claim 1, wherein a second elastic body is provided for urging the rolling element in a direction in which the taper portion expands. evening.
4 . 前記第 2弾性体と前記転動体との間に座金を設けたことを特徴とす る請求の範囲第 3項に記載の内燃機関用ラッシュアジヤス夕。 4. The rush adjuster for an internal combustion engine according to claim 3, wherein a washer is provided between the second elastic body and the rolling element.
5 . 前記バゲットは、 前記天井部の下面側に環状内壁部が設けられ、 こ の環状内壁部の内周側に前記ブランジャを配置したことを特徴とする請 求の範囲第 1項から第 3項のレ、ずれか 1項に記載の内燃機関用ラッシュ アジヤス夕。 5. The claim is characterized in that the baguette is provided with an annular inner wall portion on a lower surface side of the ceiling portion, and the plunger is arranged on an inner peripheral side of the annular inner wall portion. The rush for an internal combustion engine according to item 1.
6 . 前記テーパ部は、 周方向に間隔をおいて設けられた複数のテーパ溝 を有し、 このテーバ溝は、 前記転動体の曲率よりも大きな曲率の単一円 弧断面， 前記転動体の曲率よりも大きな曲率の円弧面を複合した断面，  6. The tapered portion has a plurality of tapered grooves provided at intervals in a circumferential direction. The tapered groove has a single arc cross section having a curvature larger than the curvature of the rolling element. A cross section that combines arc surfaces with a curvature greater than the curvature,
V字形断面， 台形断面から選択したいずれか 1つの断面を有することを 特徵とする請求の範囲第 1項から第 5項のいずれか 1項に記載の内燃機 関用ラッシュアジヤス夕。 6. The lash adjuster for an internal combustion engine according to any one of claims 1 to 5, wherein the lash adjuster has one of a V-shaped cross section and a trapezoidal cross section.
7 . 前記バケツトの內周面と前記ブランジャの外周面のうち前記テ一パ 部の非形成面に、 このテーパ部と対向する円弧状溝部を設け、 この円弧 伏溝部は、 前記転動体の曲率よりも大きな曲率の単一円弧断面， 前記転 動体の曲率よりも大きな曲率の円弧面を複合した断面， V字形断面， 台 . 形断面から選択したいずれか 1つの断面を有することを特徵とする請求 の範囲第 1項から第 5項のレ、ずれか 1項に記載の内燃機関用ラッシュァ ジャス夕。  7. An arc-shaped groove portion facing the tapered portion is provided on the non-forming 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 concave groove portion has a curvature of the rolling element. It has one of a cross section selected from the group consisting of a single circular section having a larger curvature, a composite section having a larger curvature than the rolling element, a V-shaped section, and a trapezoidal section. A rush adjuster for an internal combustion engine according to any one of claims 1 to 5, wherein
8 . 前記テーパ溝または円弧状溝は、 ヘリカル状に形成されているこ を特徵とする請求の範囲第 1項から第 7項のいずれか 1項に記載の内燃 機関用ラッシュアジヤス夕。  8. The lash adjuster for an internal combustion engine according to any one of claims 1 to 7, wherein the tapered groove or the arc-shaped groove is formed in a helical shape.
PCT/JP1995/000054 1995-01-20 1995-01-20 Lash-adjuster for an internal combustion engine WO1996022454A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1995/000054 WO1996022454A1 (en) 1995-01-20 1995-01-20 Lash-adjuster for an internal combustion engine
EP95906493A EP0752516A1 (en) 1995-01-20 1995-01-20 Lash-adjuster for an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1995/000054 WO1996022454A1 (en) 1995-01-20 1995-01-20 Lash-adjuster for an internal combustion engine

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WO1996022454A1 true WO1996022454A1 (en) 1996-07-25

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WO (1) WO1996022454A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3593674B2 (en) * 1998-08-10 2004-11-24 本田技研工業株式会社 Valve opening and closing mechanism in engine

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 (en) * 1984-06-27 1986-11-06 ジ−ケイエヌ・テクノロジ−・リミテッド automatic clearance adjuster
JPH04100005U (en) * 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 (en) * 1984-06-27 1986-11-06 ジ−ケイエヌ・テクノロジ−・リミテッド automatic clearance adjuster
JPH04100005U (en) * 1991-01-31 1992-08-28

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