EP1731720A2 - Méthode de montage d'un arbre à cames - Google Patents

Méthode de montage d'un arbre à cames Download PDF

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Publication number
EP1731720A2
EP1731720A2 EP06011510A EP06011510A EP1731720A2 EP 1731720 A2 EP1731720 A2 EP 1731720A2 EP 06011510 A EP06011510 A EP 06011510A EP 06011510 A EP06011510 A EP 06011510A EP 1731720 A2 EP1731720 A2 EP 1731720A2
Authority
EP
European Patent Office
Prior art keywords
cam
camshaft
section
jig
shaft
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06011510A
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German (de)
English (en)
Inventor
Yasuo Okamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP1731720A2 publication Critical patent/EP1731720A2/fr
Withdrawn legal-status Critical Current

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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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution

Definitions

  • the present invention relates to a method for mounting a camshaft, and in particular to a method for mounting a camshaft onto an internal combustion engine, and also relates to the engine on which the camshaft is mounted by means of the method.
  • JP-A-2000-170506 discloses a structure including a lower cam holder (cam carrier) provided for both an intake camshaft and an exhaust camshaft, and two upper cam holders (cam caps) independently provided for the intake camshaft and the exhaust camshaft. Both ends of the lower cam holder is coupled with a cylinder head by a first coupling member, while the respective upper cam holders are coupled with the lower cam holder by a set of second coupling members having a diameter smaller than a diameter of the first coupling member at a location more inside than the first coupling member. It is described that, because of the structure, the cylinder head can be compact and the first coupling member can function as a stopper for stopping a rotation of the rocker arm shaft.
  • the camshaft can be mounted after the cam carriers and the cam caps are attached to the cylinder head and the whole of them are machined throughout.
  • a large scaled machining facility is required for the throughout-machining.
  • cam carriers and the cam caps even if only one cam carrier (or cam cap) has some inconvenience, the cam carriers and the cam caps of one camshaft need to be wholly exchanged for new ones. Because of the number of such exchange parts, the camshafts produced in this manner can be expensive.
  • the present invention aims to provide a mounting method for a camshaft onto an internal combustion engine that can improve accuracy of mounting positions of support portions of journal sections without having any large scaled machining facilities required for avoiding the uneasy contact of the journal sections with the camshaft and the increase of the friction of the journal sections with the camshaft and can reduces exchange parts to the minimum even if some inconvenience occurs with some of the cam carriers or the cam caps.
  • This objective is solved in an inventive manner by a method for mounting a camshaft onto a cylinder head of an internal combustion engine, said camshaft being supported by several sets of cam carrier and cam cap, each set being independently disposed at every journal section of the camshaft, wherein at least the cam carriers are mounted onto said cylinder head using a shaft-like jig, wherein an outer diameter of a portion of the jig, which corresponds to the journal section of the camshaft, is set larger than an outer diameter of the journal section of the camshaft.
  • the method comprises the steps of providing the shaft-like jig, the portion of which corresponding to the journal section of said camshaft to be actually mounted having the outer diameter larger than the outer diameter of the journal section of said camshaft, mounting said shaft-like jig onto said cylinder head using said cam carriers to position said cam carriers at predetermined places, then, replacing said shaft-like jig with said camshaft to be actually used, under a condition that said cam carriers are coupled with said cylinder head, and afterwards, coupling said cam caps with the corresponding cam carriers.
  • the method comprises the steps of providing the shaft-like jig, the portion of which corresponding to the journal section of said camshaft to be actually mounted having the outer diameter larger than the outer diameter of the journal section of said camshaft, mounting said shaft-like jig onto said cylinder head using said sets of the cam carrier and the cam cap to position said multiple cam carriers at predetermined places, then, removing said cam caps to replace said shaft-like jig with said camshaft to be actually used, under a condition that said cam carriers are coupled with said cylinder head, and afterwards, coupling said cam caps with said cam carriers.
  • said shaft-like jig has positioning portions, and said cam carriers are positioned in an axial direction of said shaft-like jig using said positioning portions.
  • said shaft-like jig has circular sections at positions corresponding to cam sections of said camshaft, and a diameter of each circular section is the same as a diameter of a base circle of each cam section.
  • the objective is further solved in an inventive manner by a method for mounting a camshaft onto a cylinder head of an internal combustion engine, said camshaft being supported by a set of a cam carrier and a cam cap, said camshaft having a journal section held by a bearing portion of said set of the cam carrier and the cam cap, the method comprising providing a mounting jig having a fitting section fitting in a space between an outer circumferential surface of said camshaft and an inner circumferential surface of a receiving section positioned adjacent to said bearing portion of said set of the cam carrier and the cam cap, wherein a sum of a first clearance made between an inner circumferential surface of said fitting section and the outer circumferential surface of said camshaft and of a second clearance made between an outer surface of said fitting section and the inner circumferential surface of said receiving section of said set of the cam carrier and the cam cap is set smaller than a clearance made between an outer surface of said journal section and an inner surface of said bearing portion, placing said fitting section of said mounting jig between said
  • the objective is yet further solved in an inventive manner by a method for mounting a camshaft onto a cylinder head of an internal combustion engine, said camshaft being supported by sets of cam carrier and cam cap, each set being independently disposed at every journal section, wherein every journal section is held at a bearing portion of a respective set of cam carrier and cam cap and having a fitting section neighboring the journal section, wherein each set of cam carrier and cam cap has a receiving section neighboring each bearing portion to receive the respective fitting section, and wherein a clearance between an outer surface of said each fitting section and an inner surface of said each receiving section is set smaller than a clearance between an outer surface of said each journal section and an inner surface of said each bearing portion, the method comprising fitting said fitting section of said camshaft into said receiving section of said set of cam carrier and cam cap to mount said camshaft onto said cylinder head using said sets of cam carrier and cam cap, and afterwards, sliding said camshaft in an axial direction to separate said fitting sections from said receiving sections, and attaching a slide restricting member under this condition to
  • each bearing portion functions as said receiving section, and an outer diameter of each fitting section is set larger than an outer diameter of the respective journal section.
  • each fitting section is set larger than an outer diameter of the respective journal section, and an inner diameter of each receiving section is set larger than an inner diameter of the respective bearing portion.
  • said slide restricting member is a housing cap positioned at an end of said camshaft.
  • each cam carrier has a rocker arm shaft provided independently from the other cam carriers, and each rocker arm shaft has a rocker arm for swing movement.
  • the above further provides an internal combustion engine, wherein said camshaft is mounted onto said cylinder head using said cam carrier and said cam cap by means of the camshaft mounting method recited in one of the above methods.
  • FIGs. 1 and 2 show a first embodiment.
  • reference numeral 11 of FIG. 2 indicates an engine as the "internal combustion engine.”
  • the engine 11 has an intake camshaft 13 and an exhaust camshaft 14 both disposed above a cylinder head 12 and each supported by multiple sets of a cam carrier 17 and a cam cap 18, and a set of a cam housing 21 and housing caps 22 for rotation.
  • the intake camshaft 13 has a plurality of intake cam sections 13a and journal sections 13b positioned between the neighboring intake cam sections 13a, while the exhaust camshaft 14 has a plurality of exhaust cam sections 14a and journal sections 14b positioned between the neighboring exhaust cam sections 14a.
  • One end portion 13c, 14c of each camshaft 13, 14 is a power transmitting section, and has an outer diameter which is larger than the respective other end portion.
  • the set of the cam housing 21 and the housing caps 22 holds the one end portion 13c, 14c for rotation.
  • Flanges 13d, 13e are formed on both sides of the end portion 13c, while flanges 14d, 14e are formed on both sides of the end portion 14c.
  • each other end has a cam sensor rotor 13g, 14g for a WT control.
  • Cam carriers 17 for each camshaft 13, 14 have a bearing recess 17a forming a lower half surface of respective bearing portions 15, 16 for supporting the respective journal sections 13b, 14b of the camshaft 13, 14.
  • Each cam carrier 17 has a rocker arm shaft 24 provided independently from the other cam carriers 17. Each rocker arm shaft 24 supports a rocker arm 25 for swing movement.
  • each cam carrier 17 has bolt holes 17c through each one of which a bolt 26 extends for mounting the cam carrier 17 onto the cylinder head 12, and also has other bolt holes 17d through each one of which a bolt 27 extends for mounting the cam carrier 17 and the associated cam cap 18 onto the cylinder head 12.
  • Each cam cap 18 has another bearing recess 18a forming an upper half surface of the respective bearing portions 15, 16, and also has bolt holes 18b through each one of which a bolt 27 extends.
  • the cam housing 21 and the housing caps 22 individually have bearing recesses 21a, 22a for supporting both of the camshafts 13, 14.
  • a top surface of the cylinder head 12 has a plurality of knock pins 12a which can be fitted into holes of the cam carriers 17 and the cam housing 21.
  • a shaft-like jig 30 shown in FIG. 1 is used for mounting the camshaft 13, 14 and other components onto the cylinder head 12.
  • An outer diameter d of a portion 30a of the shaft-like jig 30 corresponding to the journal section 13b, 14b of the camshaft 13, 14 which is actually mounted is larger than an outer diameter of the journal section 13b, 14b by a certain length.
  • the certain length is decided in such a manner that a clearance between an outer surface of the journal section 13b, 14b of the camshaft 13, 14 and an inner surface of the bearing portions 15, 16 can be sufficient even if the respective portions have some tolerances.
  • the multiple cam carriers 17 are slackly (i.e., under a movable condition more or less) coupled with the cylinder head 12 by the bolts 26.
  • the shaft-like jig 30 is mounted on the cam carriers 17.
  • the cam caps 18 are placed on the shaft-like jig 30, and the bolts 26, 27 are tightly fixed.
  • the clearance made between each outer surface of the respective portions 30a of the shaft-like jig 30 and each inner surface of the respective bearing portions 15, 16 is smaller than a clearance made by using the actual camshaft 13, 14.
  • the cam carriers 17 and the cam caps 18 can be attached to the shaft-like jig 30 with almost easy contact.
  • the multiple cam carriers 17 can be accurately attached to the cylinder head 12.
  • cam carriers 17 or other components Even if some of the cam carriers 17 or other components have inconvenience, the throughout-machining, which is conventionally required, is not necessary. Only the cam carrier 17 or the other component which have the inconvenience can be simply exchanged for new one and can be attached using the shaft-like jig 30. Exchange parts thus can be reduced to the minimum.
  • rocker arm shafts 24 are provided to the respective cam carriers 17 independently from each other, no throughout-machining for improving the accuracy of the positioning is necessary after the multiple cam carriers 17 are mounted onto the cylinder head 12.
  • the cam caps 18 are fixed to the cylinder head 12 in this first embodiment. Alternatively, the cam caps 18 may be fixed to the cam carriers 17.
  • cam caps 18 are attached when the shaft-like jig 30 is placed in the position in this first embodiment.
  • the cam carriers 17 may be fixed to the cylinder head 12 with the bolts 26 to align the components by the shaft-like jig 30.
  • cam caps 18 are not attached when the components are aligned. After the cam carriers 17 are aligned using the shaft-like jig 30, the shaft-like jig 30 is removed to be replaced by the camshaft 13, 14, and then the cam caps 18 are attached.
  • cam caps 18 do not need to be attached or detached when the shaft-like jig 30 is placed in the position (i.e., in the alignment process), workability can be more preferable.
  • FIGs. 3-5 show a second embodiment.
  • This second embodiment differs from the first embodiment in a point that a shaft-like jig 40 has positioning sections 40a and circular sections 40b.
  • an outer diameter d of a portion 40c of the shaft-like jig 40 corresponding to the journal section 13b, 14b of the camshaft 13, 14 which is to be actually mounted is larger than an outer diameter of the journal section 13b, 14b by a certain length.
  • the certain length is decided in such a manner that a clearance between an outer surface of the journal section 13b, 14b of the camshaft 13, 14 and an inner surface of the respective bearing portions 15, 16 can be sufficient even if the respective portions have some tolerances.
  • the positioning sections 40a having a step-like configuration are formed neighboring the respective portions 40c. Each positioning section 40a fits in a receiving section 17e of the respective cam carrier 17 and in a receiving section 18c of the respective cam cap 18.
  • Each circular section 40b of the shaft-like jig 40 is formed at a location corresponding to the respective cam section 13a, 14a of the camshaft 13, 14.
  • An outer diameter of each circular section 40b is the same as an outer diameter of a base circle of the respective cam section 13a, 14a.
  • the shaft-like jig 40 has the positioning sections 40a
  • positioning of the cam carriers 17 in the axial direction of the shaft-like jig 40 can be made by the positioning sections 40a.
  • the shaft-like jig 40 can improve the alignment of the cam carriers 17 and the accuracy of the centering and positioning of the cam carriers 17 in the axial direction. Accordingly, widths of the cam sections and the journal sections can be shorter to make the camshaft lighter in weight.
  • the shaft-like jig 40 has the circular sections 40b at the locations corresponding to the cam sections 13a, 14a of the camshaft 13, 14, and the diameter of each circular section 40b is the same as the diameter of the base circle of each cam section 13a, 14a, a clearance between each rocker arm 25 positioned on the cam carrier 17 and the base circle of the respective cam section 13a, 14a can be adjusted using each circular section 40 without rotating the camshaft 13, 14.
  • cam caps 18 are attached when the shaft-like jig 40 is placed in the position also in this second embodiment.
  • the cam carriers 17 may be fixed to the cylinder head 12 by the bolts 26 to align and center the components using the shaft-like jig 40.
  • FIGs. 6 to 8 show a third embodiment.
  • This third embodiment differs from the first embodiment in a point that the shaft-like jig 30 of the first embodiment is not used.
  • a mounting method of the intake camshaft 13 will be illustrated and described below. Although a description about a mounting method of the exhaust camshaft 14 is omitted, it is the same as the mounting method of the intake camshaft 13.
  • the intake camshaft 13 has a fitting section 13f neighboring each journal section 13b, while each of the cam carriers 17 and the cam caps 18 has a receiving section 15a neighboring the respective bearing portion 15 to receive the fitting section 13f.
  • a part of each bearing portion 15, 16 functions as the receiving section 15a.
  • an outer diameter d2 of each fitting section 13f is larger than an outer diameter d3 of each journal section 13b.
  • a clearance c1 made between an outer surface of each fitting section 13f and an inner surface of each receiving section 15a is smaller than a clearance c2 made between an outer surface of each journal section 13b and an inner surface of the respective bearing portion 15.
  • the respective fitting sections 13f of the camshaft 13 fit in the receiving sections 15a of the associated cam carriers 17 and cam caps 18.
  • the camshaft 13 is mounted onto the cylinder head 12 using the cam carriers 17 and the cam caps 18 (FIGs. 7(a) and 8(a)).
  • the camshaft 13 is sled by a certain distance in the axial direction (i.e., leftward in FIGs. 6-8) so that the respective fitting sections 13f separate from the respective receiving sections 15a.
  • the housing cap 22 which is a “slide restricting member,” is attached to the cam housing 21. Thereby, the housing cap 22 fits in a space between a pair of flange sections 13d. The camshaft 13 thus is restricted in this position.
  • FIGs. 9 and 10 show a fourth embodiment.
  • a configuration of the fitting section 13f of the camshaft 13 and a configuration of the receiving section 15a of the camshaft 13 in this fourth embodiment are different from the counterparts employed in the third embodiment.
  • each fitting section 13f is larger than the outer diameter d3 of each journal section 13b, and an inner diameter d4 of each receiving section 15a is larger than an inner diameter d5 of each bearing portion 15.
  • FIGs. 11-13 show a fifth embodiment.
  • This fifth embodiment differs from the second embodiment in a point that multiple mounting jigs 33 are used.
  • each mounting jig 33 includes a pair of separable members 34,34.
  • Each separable member 34 has a fitting section 34a and a grip section 34b.
  • the pair of fitting sections 34a fits in a space between an outer circumferential surface of the camshaft 13 and an inner circumferential surface of each receiving section 15a positioned adjacent to the bearing portions 15 of each pair of the cam carrier 17 and the cam cap 18.
  • the respective cam carriers 17 are temporarily fixed to the cylinder head 12 with the bolts 26. Afterwards, the multiple mounting jigs 33 are attached to the camshaft 13. The camshaft 13 is mounted on the cam carriers 17. Then, cam caps 18 are attached.
  • each mounting jig 33 fits in a space between the outer circumferential surface of the camshaft 13 and an inner circumferential surface of the receiving section 15a of the respective bearing portion 15.
  • first clearance made between the inner circumferential surface of the fitting section 34a of the mounting jig 33 and the outer circumferential surface of the camshaft 13 and a second clearance made between an outer circumferential surface of the fitting section 34a of the mounting jig 33 and an inner circumferential surface of the receiving section 15a of the cam carrier 17 and the cam cap 18.
  • the sum of the first clearance and the second clearance is smaller than a clearance made between the outer surface of the journal section 13b and the inner surface of the bearing portion 15.
  • the respective mounting jigs 33 are sled leftward in FIGs. 11 and 12 to separate the fitting sections 34a of the mounting jigs 33 from the receiving sections 15a of the bearing portions 15, and then the separable members 34 are separated from each other to be removed from the camshaft 13.
  • a method for mounting a camshaft onto a cylinder head of an internal combustion engine using multiple sets of a cam carrier and a cam cap, and each set being independently disposed at every journal section includes providing a shaft-like jig, a portion of the jig corresponding to the journal section of the camshaft to be actually mounted having an outer diameter larger than an outer diameter of the journal section of the camshaft; mounting the shaft-like jig onto the cylinder head using the multiple sets of the cam carrier and the cam cap to position the multiple cam carriers at predetermined places; then, removing the multiple cam caps to replace the shaft-like jig with the camshaft to be actually used, under a condition that the multiple cam carriers are coupled with the cylinder head; and, afterwards, coupling the multiple cam caps with the cam carriers.
  • a method for mounting a camshaft onto a cylinder head of an internal combustion engine using multiple sets of a cam carrier and a cam cap, and each set being independently disposed at every journal section includes: providing a shaft-like jig, a portion of the jig corresponding to the journal section of the camshaft to be actually mounted having an outer diameter larger than an outer diameter of the journal section of the camshaft; mounting the shaft-like jig onto the cylinder head using the multiple cam carriers to position the multiple cam carriers at predetermined places; then, replacing the shaft-like jig with the camshaft to be actually used, under a condition that the multiple cam carriers are coupled with the cylinder head, and; afterwards, coupling the multiple cam caps with the cam carriers.
  • the shaft-like jig has positioning portions, and the multiple cam carriers are positioned in an axial direction of the shaft-like jig using the positioning portions.
  • the shaft-like jig has circular sections at positions corresponding to cam sections of the camshaft, and a diameter of each circular section is the same as a diameter of a base circle of each cam section.
  • a part of each bearing portion functions as the receiving section, and an outer diameter of the each fitting section is larger than an outer diameter of the each journal section.
  • an outer diameter of the each fitting section is larger than an outer diameter of the each journal section, and an inner diameter of the each receiving section is larger than an inner diameter of the each bearing portion.
  • the slide restricting member is a housing cap positioned at an end of the camshaft.
  • a method for mounting a camshaft onto a cylinder head of an internal combustion engine using a set of a cam carrier and a cam cap, and the camshaft having a journal section held by a bearing portion of the set of the cam carrier and the cam cap includes: providing a mounting jig having a fitting section fitting in a space between an outer circumferential surface of the camshaft and an inner circumferential surface of a receiving section positioned adjacent to the bearing portion of the set of the cam carrier and the cam cap; the sum of a first clearance made between an inner circumferential surface of the fitting section and the outer circumferential surface of the camshaft and a second clearance made between an outer surface of the fitting section and the inner circumferential surface of the receiving section of the set of the cam carrier and the cam cap being smaller than a clearance made between an outer surface of the journal section and an inner surface of the bearing portion; placing the fitting section of the mounting jig between the camshaft and
  • a plurality of the cam carriers are disposed along the camshaft, each cam carrier has a rocker arm shaft provided independently from the other cam carriers, and each rocker arm shaft has a rocker arm for swing movement.
  • an internal combustion engine wherein the camshaft is mounted onto the cylinder head using the cam carrier and the cam cap by means of the camshaft mounting method recited in one of the first to tenth aspects.
  • the method includes: providing the shaft-like jig, the portion of the jig corresponding to the journal section of the camshaft to be actually mounted having the outer diameter larger than the outer diameter of the journal section of the camshaft; mounting the shaft-like jig onto the cylinder head using the multiple sets of the cam carrier and the cam cap to position the multiple cam carriers at predetermined places; then, removing the multiple cam caps to replace the shaft-like jig with the camshaft to be actually used, under the condition that the multiple cam carriers are coupled with the cylinder head; and, afterwards, coupling the multiple cam caps with the cam carriers.
  • the accuracy of the positioning of the support portions of the journal sections can be improved without having any large scaled machining facilities required for avoiding for the uneasy contact of the journal sections with the camshaft and the increase of the friction of the journal sections with the camshaft and the exchange parts can be reduced to the minimum even if some inconvenience occurs with some of the cam carriers or the cam caps.
  • the shaft-like jig has the positioning portions, and the multiple cam carriers are positioned in the axial direction of the shaft-like jig using the positioning portions, the shaft-like jig can improve the alignment of the cam carriers and the accuracy of the positions in the axial direction. Accordingly, the widths of the cam sections and the journal sections can be shorter to make the camshaft lighter in weight.
  • the shaft-like jig has the circular sections at the locations corresponding to the cam sections of the camshaft, and the diameter of each circular section is the same as the diameter of the base circle of each cam section, the clearance between each rocker arm positioned on the cam carrier and the base circle of the respective cam section can be adjusted using each circular section without rotating the camshaft.
  • the shaft-like jig is not necessary because the same effect as the aspect of the present invention recited in the first aspect can be obtained only by sliding the camshaft. Thus, workability or the like can be improved.
  • the same effect discussed above can be obtained only by attaching or removing the mounting jig.
  • each cam carrier has the rocker arm shaft provided independently from the other cam carriers, the throughout-machining is not required to place the respective rocker arm shafts. No large scale machining facilities are required, accordingly.
  • the internal combustion engine in which the camshaft is mounted onto the cylinder head using the cam carrier and the cam cap by means of the camshaft mounting method recited in one of the first to tenth aspects is provided.
  • the accuracy of the positioning of the support portions of the journal sections can be improved, and the exchange parts can be reduced to the minimum even if some inconvenience occurs with some of the cam carriers or the cam caps.
  • a method which includes providing a shaft-like jig 30, a portion 30a of the jig 30 corresponding to a journal section of the camshaft to be actually mounted having an outer diameter d1 larger than an outer diameter of the journal section of the camshaft; mounting the shaft-like jig 30 onto the cylinder head using the multiple sets of a cam carrier 17 and a cam cap 18 to position the multiple cam carriers 17 at predetermined places; then, removing the multiple cam caps 18 to replace the shaft-like jig 30 with the camshaft to be actually used, under a condition that the multiple cam carriers 17 are coupled with the cylinder head; and, afterwards, coupling the multiple cam caps 18 with the cam carriers 17.
  • this embodiment provides a mounting method for a camshaft onto an internal combustion engine that can improve accuracy of mounting positions of support portions of journal sections without having large scaled machining facilities required for avoiding the uneasy contact of the journal sections with the camshaft and the increase of the friction of the journal sections with the camshaft and can reduces exchange parts to the minimum even if some inconvenience occurs with some of the cam carriers or the cam caps.
  • a method for mounting a camshaft onto a cylinder head of an internal combustion engine using multiple sets of a cam carrier and a cam cap, each set being independently disposed at every journal section comprising: providing a shaft-like jig, a portion of the jig corresponding to the journal section of said camshaft to be actually mounted having an outer diameter larger than an outer diameter of the journal section of said camshaft; mounting said shaft-like jig onto said cylinder head using said multiple sets of the cam carrier and the cam cap to position said multiple cam carriers at predetermined places; then, removing said multiple cam caps to replace said shaft-like jig with said camshaft to be actually used, under a condition that said multiple cam carriers are coupled with said cylinder head; and afterwards, coupling said multiple cam caps with said cam carriers.
  • a method for mounting a camshaft onto a cylinder head of an internal combustion engine using multiple sets of a cam carrier and a cam cap, each set being independently disposed at every journal section comprising: providing a shaft-like jig, a portion of the jig corresponding to the journal section of said camshaft to be actually mounted having an outer diameter larger than an outer diameter of the journal section of said camshaft; mounting said shaft-like jig onto said cylinder head using said multiple cam carriers to position said multiple cam carriers at predetermined places; then, replacing said shaft-like jig with said camshaft to be actually used, under a condition that said multiple cam carriers are coupled with said cylinder head; and afterwards, coupling said multiple cam caps with said cam carriers.
  • said shaft-like jig has positioning portions, and said multiple cam carriers are positioned in an axial direction of said shaft-like jig using said positioning portions.
  • said shaft-like jig has circular sections at positions corresponding to cam sections of said camshaft, and a diameter of each circular section is the same as a diameter of a base circle of each cam section.
  • each bearing portion functions as said receiving section, and an outer diameter of said each fitting section is larger than an outer diameter of said each journal section.
  • an outer diameter of said each fitting section is larger than an outer diameter of said each journal section, and an inner diameter of said each receiving section is larger than an inner diameter of said each bearing portion.
  • said slide restricting member is a housing cap positioned at an end of said camshaft.
  • a method for mounting a camshaft onto a cylinder head of an internal combustion engine using a set of a cam carrier and a cam cap said camshaft having a journal section held by a bearing portion of said set of the cam carrier and the cam cap
  • the method comprising: providing a mounting jig having a fitting section fitting in a space between an outer circumferential surface of said camshaft and an inner circumferential surface of a receiving section positioned adjacent to said bearing portion of said set of the cam carrier and the cam cap, the sum of a first clearance made between an inner circumferential surface of said fitting section and the outer circumferential surface of said camshaft and a second clearance made between an outer surface of said fitting section and the inner circumferential surface of said receiving section of said set of the cam carrier and the cam cap being smaller than a clearance made between an outer surface of said journal section and an inner surface of said bearing portion; placing said fitting section of said mounting jig between said camshaft and said set of the cam carrier
  • each cam carrier has a rocker arm shaft provided independently from the other cam carriers, and each rocker arm shaft has a rocker arm for swing movement.
  • an internal combustion engine wherein said camshaft is mounted onto said cylinder head using said cam carrier and said cam cap by means of the camshaft mounting method recited in one of the first to tenth aspects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP06011510A 2005-06-06 2006-06-02 Méthode de montage d'un arbre à cames Withdrawn EP1731720A2 (fr)

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EP06011510A Withdrawn EP1731720A2 (fr) 2005-06-06 2006-06-02 Méthode de montage d'un arbre à cames
EP06757085A Not-in-force EP1895111B1 (fr) 2005-06-06 2006-06-06 Procédé d'installation d'arbre à cames de moteur à combustion interne et moteur à combustion interne

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EP06757085A Not-in-force EP1895111B1 (fr) 2005-06-06 2006-06-06 Procédé d'installation d'arbre à cames de moteur à combustion interne et moteur à combustion interne

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EP (2) EP1731720A2 (fr)
JP (1) JP4279337B2 (fr)
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CN103061844B (zh) * 2011-10-18 2016-11-23 现代自动车株式会社 连续可变气门升程装置及具有该装置的发动机
GB2513328A (en) * 2013-04-23 2014-10-29 Gm Global Tech Operations Inc Cylinder head of an internal combustion engine
CN114102090A (zh) * 2021-12-16 2022-03-01 陕西柴油机重工有限公司 船用柴油机中置式凸轮轴的分段装配装置及方法
CN114102090B (zh) * 2021-12-16 2023-05-23 陕西柴油机重工有限公司 船用柴油机中置式凸轮轴的分段装配装置及方法

Also Published As

Publication number Publication date
EP1895111B1 (fr) 2012-04-18
EP1895111A4 (fr) 2011-02-23
EP1895111A1 (fr) 2008-03-05
JPWO2006132255A1 (ja) 2009-01-08
JP4279337B2 (ja) 2009-06-17
WO2006132255A1 (fr) 2006-12-14

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