US20060266315A1 - Valve actuating system for reciprocating machine - Google Patents

Valve actuating system for reciprocating machine Download PDF

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Publication number
US20060266315A1
US20060266315A1 US11/308,965 US30896506A US2006266315A1 US 20060266315 A1 US20060266315 A1 US 20060266315A1 US 30896506 A US30896506 A US 30896506A US 2006266315 A1 US2006266315 A1 US 2006266315A1
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Prior art keywords
cam shaft
actuating mechanism
valve actuating
set forth
cam
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.)
Abandoned
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US11/308,965
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English (en)
Inventor
Tsunero Hamada
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
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Yamaha Motor Co Ltd
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Publication date
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Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA reassignment YAMAHA HATSUDOKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAMADA, TSUNERO, OKAMOTO, YASUO
Publication of US20060266315A1 publication Critical patent/US20060266315A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—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
    • F01L2001/0537—Double overhead camshafts [DOHC]

Definitions

  • This invention relates to reciprocating machines such as internal combustion engines or compressors of the type having a cylinder block having one or more cylinder bores that reciprocally support a piston or pistons that are connected a crankshaft at one end. The opposite end of these cylinder bores is closed by a cylinder head affixed to the cylinder block in a suitable manner.
  • the flow into and out of the cylinder bores is controlled by valves reciprocally mounted in the cylinder head and operated by one or more camshafts journalled therein. Frequently the valves are operated from cams on the camshaft through pivotally supported rocker arms.
  • Japanese Published Application, Publication Number P2000-170506A shows a construction wherein an intake side camshaft and an exhaust side camshaft are journalled by underlying lower cam holders and overlying upper cam holders.
  • the lower cam holders condition are fastened to the cylinder head via a first series of fasteners.
  • the upper cam holder and lower cam holder are fastened to each other at positions spaced inward from the first fasteners.
  • the second fastening members each have a smaller diameter than the first fastening member.
  • each rocker shaft is configured to be supported pivotally on a respective one of a plurality of cam carriers. Therefore, when the cam carriers are assembled to the cylinder head, they need to be assembled in succession while rocker arms are fitted on the rocker shafts, causing complicated assembly work.
  • each rocker shaft should not to overlap the opening that receives the respective spark plug insert. Therefore the support section for each of the rocker shafts needs to be separately machined for each cam carrier, making positional accuracy is difficult to obtain.
  • This invention is adapted to be embodied in a low cost, easily manufactured and assembled valve actuating mechanism for a reciprocating machine having a cylinder head adapted to be affixed in closing relation to at least one cylinder bore formed in a cylinder block.
  • a cam shaft carrier is affixed to the cylinder head and defines a cam shaft bore for journaling a bearing surface of a cam shaft.
  • a rocker shaft journal is formed by the cam shaft carrier in parallel relation to the cam shaft bore and extends on at least one side of the cam shaft bore.
  • a rocker arm is journalled by the rocker shaft journal and has a follower surface engaged by a cam lobe of the cam shaft.
  • FIG. 1 is a top plan view of the cylinder head of a reciprocating machine constructed in accordance with a first embodiment of the invention, with the cam cover removed to more clearly show the construction.
  • FIG. 2 is a further enlarged view of this embodiment, with the cam shafts removed.
  • FIG. 3 is a side elevational view looking in the direction of the arrow 3 in FIG. 2 showing the valves operated in phantom.
  • FIG. 4 is a cross sectional view taken along the line 4 - 4 in FIG. 3 .
  • FIG. 5 is a cross sectional view taken along the line 5 - 5 in FIG. 3 .
  • FIG. 6 a is an enlarged view taken generally along the line 6 - 6 in FIG. 2 and shows the condition when the associated valve is closed.
  • FIG. 6 b is an enlarged view taken generally along the line 6 - 6 in FIG. 2 and shows the condition when the associated valve is opened.
  • FIG. 7 is a view in part similar to FIG. 2 and shows another embodiment of the invention.
  • FIG. 8 is a side elevational view looking in the direction of the arrow 7 in FIG. 6 showing the valves operated in phantom.
  • FIG. 9 is a top plan view, in part similar to FIG. 1 , but with the cylinder head reversed, and shows still another embodiment of the invention.
  • FIG. 10 is a further enlarged view of the embodiment of FIG. 9 , showing one of the center cam shaft carriers with the cam shafts removed.
  • FIG. 11 is a side elevational view looking in the direction of the arrow 11 in FIG. 10 showing the valves operated and the operating cam lobes in phantom.
  • FIG. 12 is a cross sectional view taken along the line 12 - 12 in FIG. 11 .
  • FIG. 13 is a top plan view, in part similar to FIGS. 2, 7 , and 10 showing only the two cam carriers of this embodiment provided at the opposite ends of the cylinder head
  • FIG. 14 is a cross sectional view of the embodiment of FIG. 13 taken along a plane passing through the axes of the rocker arm journals.
  • a multi-cylinder reciprocating machine is shown partially and is identified generally by the reference numeral 21 .
  • the invention may be applied to either reciprocating internal combustion engines or compressors. However to simplify the disclosure only engine applications are illustrated.
  • a cylinder head indicated generally at 22 is suitably affixed to a cylinder block (not shown).
  • a cylinder block not shown.
  • any number of cylinders and any engine configuration may be employed such as in line, v type or opposed.
  • a plurality of cam carriers 23 are provided on the cylinder head 22 in a manner to be described shortly.
  • the cam carriers 23 support for rotation an intake cam shaft 24 and an exhaust cam shaft 25 disposed parallel to each other.
  • the cam carriers 23 are formed by a single lower piece 23 a having lower bearing recesses 23 i and 23 e each associated with respective, axially spaced journal surfaces 24 b and 25 b of the respective intake and exhaust cam shafts 24 and 25
  • bearing caps 26 i and 26 e are affixed, in a manner to be described shortly, to the single lower piece 23 a and the cylinder head 22 .
  • These bearing caps have bearing surfaces 26 ib and 26 eb that are complementary to the lower bearing recesses 23 i and 23 e .
  • These bearing surfaces 26 ib and 23 i and 26 eb and 23 e embrace and journal the axially spaced cam shaft bearing sections 24 b and 25 b of the cam shafts 24 and 25 , respectively.
  • the driven ends of the cam shafts 24 and 25 are also journalled directly in the end of the cylinder head 22 by end bearing caps also indicated by the reference numerals 26 ie and 26 ee.
  • Threaded fasteners 27 pass through bored holes 28 in the bearing caps 26 i , and 26 e and aligned holes 29 formed in the single lower pieces 23 a to fix the elements together. At the driven end of the camshafts 24 and 25 the end bearing caps 26 ie and 26 ee are bored to cooperate with tapped holes formed in the cylinder head at the driven end. Finally the lower ends 27 e of all of these threaded fasteners 27 are threaded into tapped holes formed in the cylinder head 22 to complete the assembly.
  • a further pair of bored holes 28 are formed in axial alignment with the transverse center of the cylinder head 22 in the area of the single lower pieces 23 a between the bearings 23 i and 23 e above tapped holes in the cylinder head 22 to receive further threaded fasteners 30 for additional security in retaining the lower pieces 23 a when the bearing caps 26 i and 26 e are removed,
  • the intake cam shaft 24 is formed with a plurality of intake cams 24 c
  • the exhaust cam shaft 25 is formed with a plurality of exhaust cams 25 c .
  • These pluralities of cams 24 c and 25 c are each adapted to operate the intake and exhaust valves, to be described shortly, through respective intake and exhaust rocker arms 31 and 32 .
  • each of the cam carriers 23 is formed with an intake side rocker shaft journal opening 23 irj and an exhaust side rocker shaft opening 23 erj in a rocker shaft support section 23 ras located between the intake cam shaft bearing 23 i and the exhaust cam shaft bearing 23 e , as shown in FIGS. 2 and 3 .
  • rocker shaft support portions 23 ras are supported by the rocker shaft support portions 23 ras , as shown in FIGS. 1-4 .
  • the rocker shaft support section 23 ras is provided on both sides of the cam shaft bearings 23 i and 23 e and extends in the same direction as the cam shafts 24 , 25 (see FIG. 1 ).
  • rocker shaft journal openings 23 irj , 23 erj are formed in the cam carrier 23 as through-holes passing through the rocker shaft support section 23 ras .
  • the rocker shafts 33 , 34 are inserted in these rocker shaft through-holes 23 irj , 23 erj.
  • the single lower piece 23 a of each of the cam carriers 23 is formed with a hole 35 for a spark plug insert section between the intake rocker arm support 23 irj and the exhaust rocker arm support 23 erj .
  • This hole extends in a direction perpendicular to the axial direction of these shaft receiving sections 23 irj , 23 erj , as shown in FIGS. 1, 2 and 4 .
  • a cylindrical collar 36 is fitted In the hole 35 for each ignition plug insert section formed in the cam carrier 23 , as shown in FIG. 1 .
  • Suitably mounted ignition plugs 37 serve the combustion chambers formed in part by the cylinder head 22 through the collars 36 .
  • the collars 36 also have the function of preventing the rocker shafts 33 , 34 from slipping off the cam carrier 23 . This is accomplished by forming the rocker shafts 33 and 34 with notches 33 a and 34 a , respectively to engage parts of the collar 36 for the prevention of their slipping-off.
  • the linear thermal expansion coefficient of the collar 36 is different (either larger or smaller) than that of the cam carrier 23 . This will insure that the collar 36 can be attached to and detached from the cam carrier 23 in a cold or a hot environment and subsequently the collar 36 will be prevented from slipping off the cam carrier 23 at room temperature.
  • Such an arrangement improves handling properties of the cam carrier 23 , as well as its assembling properties, and a slipping-off prevention condition can be realized of a minimum amount of play as compared with mechanical fasteners such as bolts.
  • the cam carrier lower pieces 23 a are formed with slots 23 as and intake side rocker arms 31 and exhaust side rocker arms, 32 are inserted in these slots 23 as.
  • the rocker arms 31 , 32 are formed with shaft insert holes 31 a , 32 a , respectively for journaling rocker arms 31 and 32 in the lower pieces 23 a on their shafts 33 and 34 .
  • the intake side rocker shaft 33 is inserted in the intake side rocker shaft through-holes 23 irj and shaft insert hole 31 a .
  • the exhaust side rocker shaft 34 is inserted in the exhaust side rocker shaft through-hole 23 erj and shaft insert hole 32 a .
  • the rocker shafts 33 , 34 are supported independently for each cam carrier 23 , and pass through the rocker shaft support section 23 ras of the cam carrier 23 and extend on both sides of the cam shaft bearing section 24 b so as to be disposed parallel to the cam shafts 24 , 25 .
  • the rocker arms 31 , 32 are supported for rotation by the rocker shafts 33 , 34 on both sides of the cam shaft bearing section 26 ib of the cam carrier 23 .
  • each of the intake side cams 24 c and exhaust side cams 25 c depresses each of the intake side rocker arms 31 and exhaust side rocker arms 32 for opening or the action of the springs, to be described, releases the depression and permits the rocker arms and associated valves to move to the closed positions.
  • each of the valves, indicated generally by the reference numeral 38 , serving a respective one cylinder are adapted to be opened/closed by the movement of the four rocker arms 31 , 32 supported on the two rocker shafts 33 , 34 of one cam carrier 23 .
  • the upper bearing halves 26 ib and 26 eb have the aforementioned aligned holes 29 through which the threaded fasteners 27 pass along with the aligned bores 28 of the single lower piece 23 a for the fastening of these assemblies to the cylinder head 22 in the desired relation to the associated cylinder.
  • the cam carriers 23 also cooperate to lubricate the valves and operating mechanism.
  • the single lower piece 23 a of each cam carrier 23 is formed with an oil passage, indicated generally at 39 , shown in FIGS. 2, 3 and 6 a and 6 b .
  • This oil passage receives 39 pressurized oil from the engine lubricating system in a suitable manner and communicates with oil passages 41 , 42 , respectively, extending toward the intake rocker shaft 33 and exhaust rocker shaft 34 .
  • These passages 41 and 42 communicate respectively with coaxial oil passages 43 , 44 , formed in the rocker arm shafts 33 and 34 respectively.
  • the rocker shafts 33 , 34 are each formed hollow inside and closed at both ends to form the oil passages 43 and 44 .
  • the valve gear lubricating system also includes oil delivery notches 31 d and 32 d formed in the intake rocker arms 31 and exhaust rocker arms 32 , respectively. These oil delivery notches 31 d and 32 d are formed at the outer ends of delivery passages 43 and 44 that communicate with the rocker arm passages 41 and 42 , respectively and face toward the intake cams 24 c and exhaust cams 25 c , shown partially in FIGS. 6 a and 6 b . As best seen in FIG. 4 , the rocker shafts 33 , 34 are retained axially by notches 33 a , 34 a formed therein that are engaged by the collar 36 .
  • Each valve 38 is of the poppet type and has a valve stem 45 that is supported for reciprocation in the cylinder head 22 by a respective valve guide 42 pressed or otherwise secured to the cylinder head 22 .
  • a valve head 46 at the lower end of the respective stem cooperates with a valve seat (not shown) fixed at the combustion chamber end of the cylinder head 22 to control the flow through a respective intake or exhaust port, not shown in this figure, but as well known to those skilled in this art.
  • valves 38 are normally retained in closed positions, as also known in the art, by return springs 47 of a desired type, with coil springs shown by way of example. These springs 47 are loaded between retainers 48 engaged with the cylinder head 22 and keeper retainers 49 fixed to the upper ends of the respective valve stem 45 to normally urge the valves 38 to their closed positions as shown in FIGS. 3 and 6 a.
  • the oil delivery system for lubricating the valve train including the cam shafts 24 and 25 and specifically their respective cam lobes 24 c and 25 c , the contacted surfaces of the rocker arms 31 and 32 and the stems of the operated valves insures adequate lubrication.
  • a system is also incorporated for controlling the amount of lubricant supplied to these areas so as to prevent excess oil flow. This system is described in connection with the exhaust valves but it should be understood that the intake valves are lubricated by the same type of flow controlling construction
  • the oil or other lubricant is delivered continuously to the hollow interior of the respective rocker arm shaft, this being the passage 44 in the case of the exhaust valves 45 from the carrier base 23 a through a delivery opening 44 i that is continuously open since the rocker arm shaft 34 does not rotate.
  • the rocker arm 32 does rotate and its delivery passage 42 only overlaps a discharge opening 44 d in the associated rocker arm 32 only at the time the associated rocker arm is moved toward the valve opening positions, as shown by comparing FIG. 6 b with FIG. 6 a.
  • FIGS. 1-6 incorporates cam shafts 24 , 25 having a plurality of cams 24 c , 25 c for depressing rocker arms 31 , 32 journalled by a plurality of cam carriers 23 each formed integrally with cam shaft bearing sections 26 ib and 26 eb for supporting the cam shafts and rocker shaft support sections 23 irj and 23 erj for supporting rocker shafts 33 and 34 .
  • the rocker shafts 33 , 34 each supported independently by a cam carrier 23 , positioned in the rocker shaft support section 23 ras of the cam carrier 23 and extending on both sides of the cam shaft bearing section 26 ib .
  • the axes of the cam shafts 24 , 25 , support of the rocker arms 31 , 32 on the rocker shafts 33 , 34 on both sides of the cam bearing section 26 ib of the cam carrier 23 are also parallel.
  • the rocker shaft support section 23 ras extend on both sides of the cam shaft bearing section 26 ib in the same direction as the cam shafts 24 , 25 and is formed with slots 23 as for supporting the rocker arms 31 , 32 .
  • the rocker shaft support section 23 ras is formed with through-holes 23 irj , 23 erj passing therethrough across the slots 23 as, and the rocker shafts 33 , 34 are inserted in the through-holes 23 irj , 23 erj .
  • the cam carriers 23 , the rocker shafts 33 , 34 and the rocker arms 31 , 32 have passages 39 , 41 , 42 , 43 , 44 for oil supplied from the cylinder head 22 and the rocker shaft 33 , 34 are hollow inside and closed at both ends with the notches 33 a , 34 a being covered by the collar 36 . Therefore, leakage of oil passing through the rocker shafts 33 , 34 from the notches 33 a , 34 a can be suppressed.
  • This structure allows the hollow portions inside the rocker shaft 33 , 34 to be increased in size, effecting weight saving of the rocker shafts 33 , 34 .
  • the rocker shafts 33 , 34 also pass through the rocker shaft support section 23 ras , this invention is not limited to that specific way the rocker shafts 33 , 34 are supported. Also, although in this first embodiment, the rocker shafts 33 , 34 extending on both axial sides of the cam shaft bearing section 26 ib to be disposed parallel to the cam shafts 24 , 25 , this invention is not limited to the foregoing embodiment.
  • FIGS. 7 and 8 show another embodiment of the invention.
  • the same parts as in previous embodiments of the invention are designated by same reference numerals and description will not be repeated, except as necessary for those skilled in the art to understand and practice this and other additional embodiments to be described.
  • This embodiment employs cam carriers identified generally by the reference numeral 123 (only one of which is shown).
  • rocker shaft through-holes 123 e , 123 i are formed in respective rocker shaft support sections 123 erj and 123 irj positioned transversely outside a cam shaft bearing section, indicated generally at 124 .
  • the central part of this cam shaft bearing section 124 includes a portion defining a cylindrical opening 125 for receiving a respective collar (not shown) like the collars 36 of the previously described embodiment to hold a respective spark plug.
  • These components are formed so that the linear thermal expansion coefficient of the collar 36 is different (either larger or smaller) than that of the cam carrier 123 , as described in the previous embodiment. This will insure that the collar 36 can be attached to and detached from the cam carrier 123 in a cold or a hot environment and subsequently the collar 36 will be prevented from slipping off the cam carrier 123 at room temperature.
  • the spark plug collar receiving opening 125 is separated from the rocker arm support sections 123 irj and 123 erj by the remainder of the cam shaft bearing section 124 .
  • Other effects and functions are substantially the same as in the first described embodiment of this FIGS. 1-6 , except that while the rocker shafts 33 , 34 on which the rocker arms 31 , 32 rotate, are disposed inwardly in the first embodiment, they are dispose outwardly in this embodiment.
  • FIGS. 9-14 Another embodiment of the invention is illustrated in FIGS. 9-14 . Again where the elements of this embodiment are the same or substantially the same as components already described, those components have been identified by the same reference numerals as previously employed. Also and for the sake of brevity these components will be described only insofar as is necessary for those skilled in the art to practice this embodiment.
  • the engine associated with this embodiment and more particularly a cylinder head assembly thereof is indicated generally by the reference numeral 201 .
  • the cylinder head 201 of the multi-cylinder internal combustion engine in this embodiment is different from the multi-cylinder internal combustion engine 21 of first described embodiment of FIGS. 1-6 b in the following aspects and is also shown in a reversed position therefrom.
  • the cam carriers operate one intake valve and one exhaust valve of pairs of the adjacent cylinders spanned by these paired, middle or central cam carriers, each of which is indicated generally by the reference numeral 223 m.
  • these middle cam carriers 223 m are comprised of a single lower piece 223 ma to which a pair of respective upper bearing halves 223 mib and 223 meb is affixed by threaded fasteners 227 .
  • These middle cam carriers 223 m are each disposed between adjacent centermost cylinders, as should be readily apparent from FIG. 9 .
  • the construction for the support at the ends of the cylinder head assembly 201 will, as has been noted, described later.
  • pairs of adjacent middle intake rocker arms 231 c are supported on an intake pivot shaft 224 received in a suitable bore formed in single lower pieces 223 ma of the middle cam carriers 223 m .
  • the inner ends of these middle intake rocker arms 231 c are retained in slots 223 mas formed at one side of the single lower piece 223 ma.
  • middle exhaust rocker arms 232 c are supported on an exhaust pivot shaft 234 recieved in a suitable bore formed in the single lower pieces 223 ma of the middle cam carriers 223 m .
  • the inner ends of these middle exhaust rocker arms 232 c are also retained in slots 223 mas formed in the single lower pieces 223 ma of the middle cam carriers 223 m.
  • middle intake rocker arm shafts 224 and the middle exhaust rocker arm shafts 234 are retained in axial position in the slots 223 mas and the single lower pieces 223 ma of the middle cam carriers 223 m in the manner now to be described.
  • threaded fasteners pass through bored holes in the respective components of the cam carriers of the embodiments. These bored holes in this embodiment are identified by the reference numerals 228 .
  • the body of the cylinder head ( 201 in this embodiment) has tapped holes to threadingly engage and retrain the threaded lower ends of the fasteners 227 .
  • these fasteners 227 pass through a portion of the bores 228 which intersect the pivot shafts 224 and 234 and around which sleeves 229 are positioned to axially restrain them axially. These sleeves 229 are also received in notches 230 formed in the pins 224 and 234 to axially restrain them within their respective bores.
  • FIG. 13 is a top plan view showing only this portion of the structure of this embodiment and FIG. 14 is a cross sectional view of the structure shown in FIG. 13 taken through the pivotal axes of the rocker arms.
  • the end intake rocker arms are identified by the reference numerals 231 e and the end exhaust rocker arms are identified by the reference numeral 232 e.
  • end cam carriers 223 el and 223 er are provided to support the respective end intake rocker arms 231 e and end exhaust rocker arms 232 e for the cylinders provided at the left and right ends of the cylinder head 201 .
  • These cam carriers 223 el , 223 er are each formed generally in the same shape as the middle cam carriers 223 m but are shorter and less complex in some regards because they each only journal one intake rocker arm 231 e and one exhaust rocker arm 232 e .
  • the respective rocker shafts 224 e and 234 e are shorter in length than the rocker shafts 224 and 234 of the middle cam carriers since they only carry one rocker arm.
  • end cam carriers 223 el and 223 er journal respective ends of the camshafts 24 and 25 they are each provided with respective upper pieces 223 eib and 223 eeb that are fixed in place by the fasteners 227 in the manner as discussed with the other embodiments.
  • the lubrication system associated with the end cam carriers 223 el and 223 er is generally the same as that for the middle cam carriers and their associated components, as shown in FIG. 14 , except for the fact that it is only for two valves rather than four valves and thus it will not be described again in detail, but like components are identified by like reference numerals.
  • cam carriers In the multi-cylinder internal combustion engine of the previous embodiments the cam carriers have been associated respectively with a single cylinder. They have thus been centered over the axis of the associated cylinder bore of the cylinder block. Thus the collars 36 have passed through the central openings that receive them. Also, as has been noted, this affords the opportunity to use materials of different thermal expansion to assure retention. The same effect is obtained with this embodiment, as will now be described.
  • the middle cam carriers 223 m are each mounted between adjacent cylinders.
  • these middle cam carriers 223 m have a length that is somewhat less than the distance between adjacent cylinder axes.
  • the adjacent ends are formed with semi-cylindrical notches 241 that are complimentary to the lower portions of the cylindrical collars 36 . Therefore, even in the multi-cylinder internal combustion engine 201 having an ignition plug 37 dispose above each cylinder, the cam carriers 223 m can be configured such that they don't obstruct the disposition of ignition plugs 37 .
  • the degree of freedom in designing can be increased for the disposition of cam carriers 223 m in the multi-cylinder internal combustion engine 201 .
  • connection between the collars 216 , cylinder head 201 and various cam carriers 223 m , 223 el and 223 er as well as the interengagement between the various rocker arm shafts and the fasteners maintains all of the components in their desired relationship and reduces the labor and machining to produce the engines, as described

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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US20170159605A1 (en) * 2015-12-07 2017-06-08 Mahle International Gmbh Cylinder head cover
US10309265B2 (en) * 2017-03-21 2019-06-04 Honda Motor Co., Ltd. DOHC-type internal combustion engine
US10309339B2 (en) * 2015-05-25 2019-06-04 Nissan Motor Co., Ltd. Internal combustion engine

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JP5139112B2 (ja) * 2008-02-19 2013-02-06 ヤマハ発動機株式会社 エンジン
US11692503B2 (en) 2020-12-07 2023-07-04 Ford Global Technologies, Llc Methods and systems for an engine with removable camshaft carrier

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US20170159605A1 (en) * 2015-12-07 2017-06-08 Mahle International Gmbh Cylinder head cover
US10550795B2 (en) * 2015-12-07 2020-02-04 Mahle International Gmbh Cylinder head cover
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