DE102019118201A1 - COMBUSTION ENGINE FOR SADDLE VEHICLE - Google Patents

Abstract

[OBJECT] In an internal combustion engine for a semitrailer vehicle that has a secondary air supply passage that extends between an air filter disposed over an engine body and exhaust ports to enable a part of the secondary air supply passage to be arranged in a cylinder head while avoiding an increase in weight of the cylinder head and there is no problem of deterioration between parts near passages in the head and a machining tool.
[SOLUTION] Passages in the head 80a of a secondary air supply passage 80, which are arranged inside a cylinder head 31, are at least partially defined in tubes 98 separated from the cylinder head 31, and the tubes 98 are viewed from a direction along a cylinder axis C in Positions adjacent to the shaft support bearing 73 from the suction-side shaft support bearings 73 and the exhaust-side shaft support bearings 74 are arranged.

Description

[TECHNICAL AREA]

The present invention relates to an internal combustion engine for a semitrailer vehicle, in which a cylinder head serves as part of an engine body attached to a vehicle frame, the cylinder head having defined intake channels and exhaust gas channels therein, the cylinder head having intake valves and exhaust gas valves which can be opened and locked therein an intake-side rocker arm shaft and an exhaust-side rocker arm shaft serve as part of a valve actuation mechanism for opening and closing the intake valves and the exhaust gas valves and extend parallel to a crankshaft, the intake-side rocker arm shaft and the exhaust-side rocker arm shaft being supported on a plurality of intake-side shaft support bearings and a plurality of exhaust-side shaft support bearings, which are arranged in the cylinder head, and a secondary air feed passage extends between an air filter arranged above the engine body and the exhaust gas ducts.

GENERAL PRIOR ART

From patent document 1, a structure is known in which passage portions of a secondary air supply device, which are arranged inside a cylinder head and a head cover, are cut by a machining tool such as e.g. a drill or the like are drilled directly into the cylinder head and the head cover.

[TECHNICAL DOCUMENT]

[Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2004-285979

SUMMARY OF THE INVENTION

[TASK TO BE SOLVED BY THE INVENTION]

In the structure disclosed in Patent Document 1, however, it is necessary that the passage portions of the secondary air injection passage located inside the cylinder head are machined to make thicker portions around the passage portions to withstand the drilling operation. The thicker areas not only increase the weight of the cylinder head, but also require a certain structure in order to avoid impairment between the machining tool and surrounding elements during the machining process.

The present invention has been made in view of the above-mentioned fact. An object of the present invention is to provide an internal combustion engine for a semitrailer vehicle in which a part of a secondary air supply passage can be arranged inside a cylinder head while avoiding an increase in the weight of the cylinder head and no problems of deterioration between parts near passages in the head and a machining tool.

[MEANS TO SOLVE THE PROBLEM]

To achieve the above object, according to a first feature of the present invention, there is provided an internal combustion engine for a semitrailer vehicle in which a cylinder head serves as part of an engine body attached to a vehicle frame, the cylinder head having defined intake channels and exhaust gas channels therein, the cylinder head also Intake valves and exhaust valves, which are openable and closable therein, an intake-side rocker shaft and an exhaust-side rocker shaft serve as part of a valve actuation mechanism for opening and closing the intake valves and the exhaust valves and extend parallel to a crankshaft, the intake-side rocker shaft and the exhaust-side rocker shaft are mounted on a plurality of intake-side shaft support bearings and a plurality of exhaust-side shaft support bearings, which are arranged in the cylinder head, and a secondary air feed passage between a ü Air filter arranged above the engine body and the exhaust gas ducts, characterized in that passages in the head of the secondary air supply passage, which are arranged in the cylinder head, are at least partially defined in each case in pipes separate from the cylinder head, and when viewed from a direction along the cylinder axis, the pipes are each arranged in positions adjacent to either the intake-side shaft support bearings or the exhaust-side shaft support bearings.

According to a second feature of the present invention, in addition to the embodiment of the first feature, the intake-side rocker shaft and the exhaust-side rocker shaft are each arranged in positions offset from the intake valves and the exhaust valves in a vehicle width direction, and are the one shaft support bearing in a side view and the pipes are arranged in positions adjacent to each other between the intake valves and the exhaust valves.

According to a third feature of the present invention, in addition to the implementation of the first or second feature, are in one Side view of the intake channels and the intake-side rocker arm shaft arranged in positions that arrange the intake valves between them.

According to a fourth feature of the present invention, in addition to the embodiment according to any one of the first to third features, when viewed from the direction along the cylinder axis, screws, the open ends of openings defined in the cylinder head and open toward the head cover side are arranged adjacent to the tubes.

According to a fifth feature of the present invention, in addition to the embodiment according to one of the second to fourth features, lower parts of intake-side rocker arms and exhaust-side rocker arms, which are pivotally mounted on the intake-side rocker arm shaft and the exhaust-side rocker arm shaft, are respectively in the intake-side shaft support bearings and Exhaust-side shaft support bearings defined grooves, and each of the tubes is arranged so that at least portions of grooves, from the plurality of grooves, which are closest to the tube in a direction along the axes of the intake-side and exhaust-side rocker arm shafts, are in two imaginary planes, which run through opposite end edges of the tube in the direction along the axes of the intake-side and exhaust-side rocker arm shafts, the imaginary planes extending perpendicular to the axes of the intake-side and exhaust-side rocker arm shafts.

[EFFECTS OF THE INVENTION]

According to the first feature of the present invention, the passages in the head of the secondary air supply passage, which are arranged inside the cylinder head, are at least partially defined in the tubes separate from the cylinder head. Thus, when the cylinder head is machined by a machining tool, the machining tool does not interfere with the parts that define the passages in the head therein. Furthermore, it is not necessary to make parts thicker around the passages in the head in the cylinder head. It is thus possible to contribute to a reduction in the weight of the cylinder head. In addition, since the tubes are arranged in positions adjacent to the respective shaft support bearings from the intake-side shaft support bearings and the exhaust-side shaft support bearings when viewed from the direction along the cylinder axis, the distances between the one shaft support bearings and the passages in the head are reduced in order to make the cylinder head compact to be able to.

According to the second feature of the present invention, the intake-side rocker shaft and the exhaust-side rocker shaft are offset from the intake valves and the exhaust valves in the vehicle longitudinal direction, and in a side view, the one shaft support bearing and the pipes are arranged in positions adjacent to each other between the intake valves and the exhaust valves. Thus, the one intake shaft support bearing can be machined without any problems, since the pipes are separated from the cylinder head, even if in the limited space between the intake valves and the exhaust valves, the one shaft support bearing and the pipes are arranged close to one another in order to make the cylinder head as compact and light as possible.

According to the third feature of the present invention, since the intake ports and the intake side rocker shaft are each arranged in positions that the intake valves interpose between them in side view, the intake ports can be arranged at an acute angle with respect to the cylinder axis, so that the intake side rocker shaft is not further than the intake valves is arranged on the intake duct side, which leads to a reduction in the intake resistance, so that an increased output can be achieved from the internal combustion engine.

According to the fourth feature of the present invention, since the screws that close the openings of the cylinder head are located adjacent to the pipes when viewed from the direction along the cylinder axis, the screws can be placed closer to the pipes because the pipes are from the cylinder head are separated, which makes the cylinder head light and compact.

According to the fifth feature of the present invention, the grooves in which the lower parts of the intake-side rocker arms and the exhaust-side rocker arms are mounted are defined in the intake-side shaft support bearings and the exhaust-side shaft support bearings, respectively. At least portions of the grooves that are closest to the tube in the direction along the axes of the intake-side and exhaust-side rocker arm shafts are in the two hypothetical planes that run through both edges of the tube in the direction along the axes of the intake-side and exhaust-side rocker arm shafts. In addition to the fact that when the grooves are machined, there is no impairment of the passages in the head, the tubes and the grooves closest to the tubes can be brought closer together in the direction along the axes of the intake-side and exhaust-side rocker arm shafts, whereby the Cylinder head is made more compact and lighter.

list of figures

• [ 1 ] shows a left side view of a two-wheeled motor vehicle.
• [ 2 ] shows a left side view of an essential part of an internal combustion engine.
• [ 3 ] shows a sectional view along the line 3-3 out 2 ,
• [ 4 ] shows an enlarged view of one by an arrow 4 in 3 indicated section.
• [ 5 ] shows a sectional view along the line 5-5 out 3 ,
• [ 6 ] shows a sectional view along the line 6-6 out 3 ,
• [ 7 ] shows a perspective view of a first cam receptacle.
• [ 8th ] shows a view along an arrow 8th in 2 ,
• [ 9 ] shows an enlarged view of one by an arrow 9 in 6 indicated section.

PROCEDURE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to the accompanying drawings of FIG 1 to 9 described. In the following description, the directions front, rear, left, right, up and down are referred to as directions when viewed from the driver of a two-wheeled motor vehicle.

In 1 a two-wheeled motor vehicle has a body frame as a saddle vehicle F with: a control head tube 13 on which a handlebar 12 and a front fork rotatably supporting a front wheel WF 11 be steered supported; a pair of left and right main frames 14 that extend backwards and downwards from the steering head tube 13 extend; a pair of left and right swing frames 15 extending from rear end portions of the main frame 14 extend down; a lower frame 16 extending from the head tube 13 extends downward and integrally with front lower ends of the main frame 14 connected is; and a pair of left and right seat frames 17 which have a truss structure and extend from rear end portions of the main frame 14 extend backwards and upwards. The main frame 14 and the swing frame 15 are integrally formed with each other.

An internal combustion engine e that on the body frame F is attached, has a motor body 18 on that below the main frame 14 arranged and on a lower portion of the lower frame 16 , rear sections of the main frame 14 and lower sections of the swing frame 15 is supported. One over the engine body 18 arranged fuel tank 19 is on the main frame 14 supported. A driver's seat 20 that is behind the fuel tank 19 is arranged is on the seat frame 17 supported.

A swivel arm 22 has a rear end portion running along the vehicle longitudinal direction. A rear wheel WR has an axis 21 that are pivotable on the rear end portion of the pivot arm 22 is stored. The swivel arm 22 has one on the swing frame 15 about a fulcrum 23 stored front end section. By the internal combustion engine e force generated is by a transmission device 24 transfer to the WR rear wheel with a drive chain.

A front section of the body frame F and a portion of the internal combustion engine e are with a front panel 24 that covered the body frame F covers from the front. The fuel tank 19 is with the tank cover 25 covered.

In 2 points the engine body 18 The following on: a crankcase 29 in which a crankshaft 28 is rotatably supported with an axis extending in the vehicle width direction; a cylinder block 30 that with an upper end of a front portion of the crankcase 29 is coupled and runs forward and upward; a cylinder head 31 that with an upper end portion of the cylinder block 30 is coupled; as well as a head cover 32 that with an upper end portion of the cylinder head 31 is coupled.

As also in the 3 to 6 illustrated, the engine body 18 an in-line multi-cylinder structure with a plurality of cylinders arranged in the vehicle width direction. According to the present embodiment, the engine body 18 an in-line four-cylinder structure in which the cylinders are each in the cylinder block 30 defined and arranged in the vehicle width direction cylinder bores 33 contain.

A piston 34 is slidable in the cylinder bore 33 fitted in each cylinder. A combustion chamber 35 is between the cylinder block 30 and the cylinder head 31 each defined in connection with the cylinder, the piston 34 one of the combustion chamber 35 has opposite upper section. The cylinder head 31 has, in this case defined in connection with the cylinder, an intake duct 36 that a pair of intake valve openings 36a has, which in a ceiling wall the combustion chamber 35 are open, and in a rear side wall 31a of the cylinder head 31 flows, and an exhaust duct 37 on that of a pair of exhaust valve openings 37a has, which in the top wall of the combustion chamber 35 are open, and into a front side wall 31b of the cylinder head 31 empties.

An intake device 38 that with the intake ducts 36 is connected, has one of the four suction channels 36 shared air filter 39 and four throttle bodies 40 on, each located therein and between the air filter 39 and the intake ducts 36 arranged throttle valves 41 exhibit. The air filter 39 is over the cylinder head 31 of the engine body 18 arranged and has one over the head cover 32 previous section. As in 1 illustrates, has an exhaust device 42 that with the exhaust ducts 37 is connected individually to the exhaust ducts 43 connected exhaust pipes 43 , one together with the downstream ends of the exhaust pipes 43 connected catalyst 44 and a muffler 45 on that is located on the right side of the rear wheel WR and with the downstream end of the catalyst 44 connected is.

The cylinder head 31 takes a pair of intake valves 47 , which are assigned to the cylinders and in the cylinder head 31 are arranged around the intake valve openings 36a able to open and close, and a pair of exhaust valves 48 in itself, which is assigned to each cylinder and in the cylinder head 31 are arranged around the exhaust valve openings 37a to be able to open and close. The intake valves 47 are by appropriate valve springs 49 biased in the valve closing direction while the exhaust valves 48 usually by means of appropriate valve springs 50 are biased in the valve closing direction.

A valve actuation chamber 52 that have a valve actuation mechanism 51 for opening and closing the suction valves 47 and the exhaust valves 48 takes in is between the cylinder head 31 and the head cover 32 Are defined. The valve actuation mechanism 51 has the following: an intake-side camshaft 54 with several intake-side cams 53 (eight intake-side cams 53 in the present embodiment) that the intake valves 47 are individually assigned; an exhaust-side camshaft 56 with several exhaust-side cams 55 (eight exhaust-side cams 55 in the present embodiment) that the exhaust valves 48 are individually assigned; several rocker arms on the intake side 57 (eight intake-side rocker arms 57 in the present embodiment) between the upper ends of valve stems 47a of the respective intake valves 47 and the intake-side cam 53 are arranged; several exhaust-side rocker arms 58 (eight exhaust-side rocker arms 58 in the present embodiment) between the upper ends of valve stems 48a of the respective exhaust valves 48 and the exhaust-side cam 55 are arranged; a rocker arm shaft on the intake side 71 that in the cylinder head 31 is mounted such that they lower parts of the rocker arm on the suction side 57 pivotally mounted; and a rocker arm shaft on the exhaust side 72 that in the cylinder head 31 is mounted such that they lower parts of the exhaust-side rocker arm 58 pivotally mounted.

The intake-side camshaft 54 and the exhaust-side camshaft 56 extend parallel to the axis of the crankshaft 28 and are on both sides of a cylinder axis C , namely the axis of the cylinder bore 33 , in the engine body 18 arranged.

The cylinder head 31 consists of one piece: four first cam bearing walls 59 by the intake-side camshaft 54 and the exhaust-side camshaft 56 be used together and each in positions corresponding to the respective combustion chambers 35 are arranged; and a second cam journal wall 60 (please refer 3 ) from the intake-side camshaft 54 and the exhaust-side camshaft 56 shared and between the rightmost combustion chamber 35 in the cylinder arrangement direction and a right side wall 31c of the cylinder head 31 is arranged. First cam recordings 61 are each on the first cam journal walls 59 corresponding to the two right cylinders in the cylinder arrangement direction and the first cam journal walls 59 attached to the two left cylinders in the cylinder arrangement direction. A second cam intake 62 is on the second cam bearing wall 60 attached. The intake-side camshaft 54 and the exhaust-side camshaft 56 are through the first and second cam journal walls 59 and 60 and the first and second cam seats 61 and 62 rotatably mounted.

As in 7 illustrated, has the first cam receptacle 61 integrally a pair of journal wall sections 61a that individually the first cam journal walls 59 correspond, as well as a pair of connecting walls 61b on the trunnion wall sections 61a connect with each other. A sealing tube 61c to insert a (not shown) spark plug in this is in one piece with a central part of the journal wall sections 61a connected, a head end of the spark plug to the upper portion of the combustion chamber 35 opposite. Each of the trunnion wall sections 61a also has a pair of insertion openings defined therein 63 on both sides of the intake-side camshaft 54 for inserting appropriate screws 65 in this as well as a pair of insertion openings defined therein 64 on both sides of the exhaust-side camshaft 56 for inserting appropriate screws 66 into this on. A cylindrical positioning tube section 61d forms part of one of the insertion openings 64 and is integral with the journal wall portion 61a connected such that it is in the first cam bearing wall 59 can be fitted.

The second cam holder 62 is about screws 67 , each on both sides of the intake-side camshaft 54 are arranged, as well as screws 67 , each on both sides of the exhaust-side camshaft 56 are arranged on the second cam journal wall 60 attached.

It gets power from the crankshaft 28 on the intake-side camshaft 54 and the exhaust-side camshaft 56 through a time-controlled power transmission device 70 with driven gears 68 and 69 transmitted, each at the right ends of the intake-side camshaft 54 and the exhaust-side camshaft 56 are fixed in the vehicle width direction. The intake-side camshaft 54 and the exhaust-side camshaft 56 are rotated by the transmitted force at a speed that is half the speed of the crankshaft 28 equivalent.

The lower parts of the intake-side rocker arms 57 can be swiveled on the intake-side rocker arm shaft 71 stored, which is parallel to the crankshaft 28 extends while the lower parts of the exhaust-side rocker arm 58 swiveling on the exhaust-side rocker arm shaft 72 are stored, which are parallel to the crankshaft 28 extends. The intake-side rocker arm shaft 71 and the exhaust side rocker arm shaft 72 are each arranged in positions which are opposite the intake valves 47 and the exhaust valves 48 are offset in the vehicle longitudinal direction. That is, the rocker arm shaft on the intake side 71 is in one opposite the intake valves 47 forward in the vehicle longitudinal direction with respect to the intake valves 47 staggered position while the intake valves 47 , viewed from the side, between the intake-side rocker arm shaft 71 and the intake ducts 36 to be ordered. The exhaust-side rocker arm shaft 72 is in one opposite the exhaust valves 48 arranged forward in the vehicle longitudinal direction.

The intake-side rocker arm shaft 71 is inserted into and supported by several (eight in the present embodiment) suction side shaft supports 73 that are in one piece on the first cam bearing walls 59 of the cylinder head 31 are arranged, the suction-side shaft support 73 as a pair on every first cam journal wall 59 are provided. By screws 75 that in part of the suction side shaft support 73 are screwed and into the intake-side rocker arm shaft 71 intervene prevents the rocker arm shaft on the intake side 71 rotates. The exhaust-side rocker arm shaft 72 is introduced into and supported by several (eight in the present embodiment) exhaust-side shaft supports 74 that are in one piece on the first cam bearing walls 59 of the cylinder head 31 are arranged, the exhaust-side shaft carrier 74 as a pair on every first cam journal wall 59 are provided. By screws 76 that in part of the exhaust-side shaft support 74 are screwed and into the exhaust-side rocker arm shaft 72 intervene prevents the rocker arm shaft from moving 72 rotates.

The suction-side shaft supports 73 have defined grooves in these 77 , and the lower parts of the intake-side rocker arms 57 are each in the grooves 77 fitted. The intake-side rocker arms 57 each have head end sections between the suction-side cams 53 and the upper ends of the valve stems 47a of the respective intake valves 47 are arranged. The exhaust-side shaft supports 74 have defined grooves in them 78 on, and the lower parts of the exhaust-side rocker arm 58 are each in the grooves 78 fitted. The exhaust-side rocker arms 58 each have head end sections between the exhaust-side cams 55 and the upper ends of the valve stems 48a of the respective exhaust valves 48 are arranged.

As also in 8th shown are the air filter 39 and one of the two exhaust valve openings 37a of the exhaust duct 37 in the cylinder head 31 for each cylinder through a secondary air feed passage 80 connected with each other. The secondary air supply passage 80 contains diaphragm valves 81 that on the head cover 32 are arranged in such a way that, depending on the fluctuations in the exhaust gas pressure, in the exhaust gas ducts 37 can be opened and closed, as well as a solenoid valve 82 that between the diaphragm valve 81 and the air filter 39 is arranged such that it is the secondary air supply passage 80 can optionally open and close.

Each of the diaphragm valves 81 is on the head cover 32 attached in connection with a pair of cylinders, which are arranged adjacent to each other in the cylinder arrangement direction. The diaphragm valves 81 are in appropriate diaphragm valve chambers 83 added, each through the head cover 32 and one by a pair of screws 91 on the head cover 32 attached cover part 84 are defined.

Each of the diaphragm valves 81 has a valve seat 85 on the space in the diaphragm valve chamber 83 into an upper upstream room 83a and a lower downstream room 83b divided and an outer peripheral edge portion between the head cover 32 and the cover element 84 is clamped and fastened, an elastic valve body 87 that one in the middle part of the valve seat 85 defined valve opening 86 can open and close, as well as one together with the valve body 87 on the valve seat 85 attached membrane stop 88 having. An air permeable heat shield 89 is in the downstream room 83b arranged and on the head cover 32 attached to the negative impact of from the exhaust duct 37 back-flowing high-temperature exhaust gases on the diaphragm valve 81 to reduce.

The solenoid valve 82 is part of the secondary air supply passage 80 with the cover element 84 through a connecting pipe 90 connected, which runs rectilinearly and on the cover element 84 is stored. The engine body 18 has an in-line four-cylinder structure in which the four cylinders are arranged in the vehicle width direction and the solenoid valve 82 is between the cover members arranged in pairs in the vehicle width direction 84 arranged, the cover elements 84 on the head cover 32 of the engine body 18 are mounted in a spaced apart relationship in the vehicle width direction.

The cover elements 84 have corresponding pipe connections 84a on the side of the solenoid valve 82 opposite side surfaces of the cover elements 84 on, and a pair of connecting pipes 90 used to connect the solenoid valve 82 and the cover elements 84 are aligned straight in the vehicle width direction is with the pipe connections 84a connected. The connecting pipes 90 are in the pipe connections 84a fitted and connected to them such that they the distances between the solenoid valve 82 and the cover elements 84 can adjust.

The solenoid valve 82 has an actuation axis CA that are perpendicular to an imaginary plane PL1 which runs the cylinder axis C each cylinder has. The actuation axis CA is, when viewed in a side view from a side in the vehicle width direction, between the head cover 32 and a maximum protrusion end 84b of the cover element 84 arranged the farthest from the head cover 32 in a direction along the cylinder axis C protrudes.

The air filter 39 has a portion thereof that is above the head cover 32 is arranged, with a recess 94 (please refer 2 ) in a lower part of the air filter 39 over the head cover 32 is defined, the recess 94 is recessed upwards to the air filter 39 from the solenoid valve 82 keep clear.

The solenoid valve 82 and the air filter 39 are through a hose 95 connected together as part of the secondary air supply passage 80 serves. An end section of the hose 95 is with the solenoid valve 82 connected, and the other end portion is with a left side wall of a filter housing 97 of the air filter 39 connected in the vehicle width direction to a clean side inside the air filter 39 connect while from the air filter 39 through one in the air filter 39 absorbed filter element 96 purified air is introduced.

The secondary air supply passage 80 has passages 80a in the head on that in the cylinder head 31 are defined. The passages 80a in the head are from the lower downstream room 83b the diaphragm valve chamber 83 branched, which is each associated with a pair of adjacent cylinders, and extend in the direction of the respective cylinder. The passages 80a in the head are at least partially, in the present embodiment partially, in corresponding tubes 98 defines which of the cylinder head 31 are separated.

The pipe 98 is adjacent to the shaft support bearing on the intake side 73 arranged which, when viewed from a direction along the cylinder axis C , either the intake-side shaft support bearing 73 or the exhaust-side shaft support bearing 74 represents. The cylinder head 31 has defined holes in it 99 , through which a when casting the cylinder head 31 used sand core was removed, the holes 99 towards the head cover 32 are open. The holes 99 have open ends through corresponding ones adjacent to the tubes 98 arranged screws 100 are closed when coming from the direction along the cylinder axis C considered.

As in 9 illustrated, has the first cam receptacle 61 one-piece bearing tube sections 61e on that are adjacent to the sealing tubes 61c the first cam intake 61 are arranged. Each of the bearing tube sections 61e has a first assembly opening defined therein 101 , a first connection opening 102 that have a smaller diameter than the first mounting opening 101 has and coaxial with an upper end of the first mounting opening 101 is connected, and a second mounting opening 103 on the same diameter as the first mounting opening 101 has and coaxial with the first connection opening 102 connected is. The pipes 98 have corresponding, in the first assembly openings 101 fitted upper end sections. An annular first sealing element 104 is between the bearing tube section 61e and the pipe 98 arranged. One to the side of the first cam mount 61 running connection projection 32a stands in one piece from the head cover 32 such that it is close to an upper surface of the first cam receptacle 61 at an opening edge at the upper end of the second assembly opening 103 is arranged or abuts against this. The connection lead 32a has, in this, a third assembly opening 105 with the same diameter as the second assembly opening 103 and coaxial to it, as well as a second connection opening 106 that have a smaller diameter than the third mounting opening 105 and the downstream space 83b the diaphragm valve chamber 83 with the third assembly opening 105 combines. A circular tapping pin 107 has opposite end portions, each in the second mounting opening 103 and the third mounting hole 105 are fitted. An annular second seal 108 is between the tapping pin 107 and the connection tab 32a arranged.

The cylinder head 31 has defined, fourth assembly openings in it 109 , with the lower end portions of the tubes 98 mounted in these, third connection openings on the floor and defined therein 110 which are coaxial with the fourth mounting holes 109 are connected and a smaller diameter than the fourth mounting holes 109 have, and fourth connection openings 111 that the exhaust valve openings 37a and the third connection openings 110 connect with each other. Annular third seals 112 are between the tubes 98 and the cylinder head 31 arranged.

That is, the passages 80a are in the head through the pipes 98 and the third and fourth communication openings 110 and 111 Are defined. The downstream rooms 83b of the diaphragm valves 81 stand with the passages 80a in the head through the second connection openings 106 who have favourited Knock Pins 107 and the first connection openings 102 in connection.

The grooves 77 and 78 , in which the lower parts of the intake-side rocker arms 57 and the exhaust-side rocker arm 58 are mounted in the shaft support bearings on the intake side 73 and the exhaust-side shaft support bearings 74 Are defined. The pipes 98 are each arranged such that at least sections of the grooves 77 and 78 that the pipe 98 in a direction along the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 are closest, within two imaginary levels PL2 present by opposite end edges of the tube 98 in the direction along the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 run and perpendicular to the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 extend.

The operation of the present embodiment is described below. The diaphragm valves 81 are in the secondary air feed passage 80 included the one above the cylinder head 31 arranged air filter 39 and the exhaust ducts 37 connects together, and the solenoid valve 82 for optional opening and closing of the secondary air feed passage 80 is in the secondary air supply passage 80 between the diaphragm valves 81 and the air filter 39 contain. Because the cover elements 84 that between themselves and the head cover 32 the the diaphragm valves 81 diaphragm valve chambers accommodating therein 83 define on the head cover 32 are attached, and the solenoid valve 82 through the connecting pipes 90 with the cover elements 84 connected and on the cover elements 84 is supported, the distances between the diaphragm valves 81 and the solenoid valve 82 and the distance between the air filter 39 and the solenoid valve 82 be set briefly. Thus, it is possible to pass the secondary air supply passage 80 briefly run the solenoid valve 82 easy to attach without increasing the number of parts used and to improve ease of installation.

Because the solenoid valve 82 between the cover elements 84 is arranged, which are in pairs and aligned in the vehicle width direction and at a distance in the vehicle width direction on the head cover 32 of the engine body 18 are attached, which has an in-line four-cylinder structure in which the four cylinders are arranged in the vehicle width direction, the distances between the solenoid valve 82 and the diaphragm valves 81 can be shortened, thereby reducing the secondary air supply passage 81 can be shortened.

Furthermore, the pipe connections 84a on the solenoid valve side 82 opposite side surfaces of the cover elements 84 arranged, which are in pairs in the vehicle width direction, and the paired connecting pipes 90 that are aligned straight in the vehicle width direction and between the solenoid valve 82 and the cover elements 84 connect with the pipe connections 84a are connected. Thus, the distances between the solenoid valve 82 and the diaphragm valves 81 be as short as possible.

Because the connecting pipes 90 into the pipe connections 84a fitted and connected to these to the distances between the solenoid valve 82 and the cover elements 84 to be able to adjust the solenoid valve 82 and in pairs present cover elements 84 which have been partially assembled with the distances set between these, on the head cover 32 to be built in. Consequently, compared to a method of assembling the solenoid valve 82 and the cover elements 84 each individually in their place, no space required for their assembly in their place, and thus an assembly space saving can be achieved, which leads to a reduction in the overall size of the internal combustion engine e contributes.

The actuation axis also stands CA of the solenoid valve 82 perpendicular to the imaginary plane PL1 with the respective cylinder axis C the cylinder and, when viewed in side view from one side in the vehicle width direction, is between the head cover 32 and the maximum end of the protrusion 84b of the cover element 84 arranged the farthest from the head cover 32 in a direction along the cylinder axis C protrudes. Thus the extent of the protrusion of the solenoid valve 82 that from the head cover 32 in the direction along the cylinder axis C protrudes, which contributes to a reduction in the size of the internal combustion engine e in the direction along the cylinder axis C allows.

In addition, the air filter 39 the section of it over the head cover 32 is arranged, and the recess 94 is in the lower part of the air filter 39 over the head cover 32 defined, the recess 94 is recessed upwards to the air filter 39 from the solenoid valve 82 keep clear. Consequently, the air filter 39 and the head cover 32 be arranged closer to each other, which contributes to a reduction in the overall size of the internal combustion engine e allows.

The intake-side rocker arm shaft 71 and the exhaust side rocker arm shaft 72 that are part of the valve actuation mechanism 51 for opening and closing the suction valves 47 and the exhaust valves 48 serve and parallel to the crankshaft 28 are on the suction side shaft support bearings 73 and the exhaust-side shaft support bearings 74 stored which in the cylinder head 31 are arranged. At least sections of the inside of the cylinder head 31 arranged passages 80a in the head of the secondary air supply passage 80 located between the exhaust ducts 37 and that over the engine body 18 arranged air filter 39 stretches are in the tubes 98 defines which of the cylinder head 31 are separated. Thus impaired while machining the cylinder head 31 through a machining tool, the machining tool is not the parts that make up the passageways 80a train in the head. It is still not necessary to have parts around the passageways 80a in the head around in the cylinder head 31 to do more. This can lead to a reduction in the weight of the cylinder head 31 be contributed.

Furthermore, since each of the pipes 98 in the position adjacent to the intake-side shaft support bearing 73 is arranged, which, when viewed from the direction along the cylinder axis C , either the intake-side shaft support bearing 73 or the exhaust-side shaft support bearing 74 is the distance between the shaft support bearing on the intake side 73 and the passage 80a reduced in the head so that a compact design of the cylinder head 31 is possible.

Because the intake-side rocker arm shaft 71 and the exhaust side rocker arm shaft 72 are arranged in the respective positions, which are opposite the intake valves 47 and the exhaust valves 48 are offset in the vehicle longitudinal direction, and the suction-side shaft support bearings 73 and the pipes 98 in positions adjacent to each other between the intake valves 47 and the exhaust valves 48 are arranged, even if the suction-side shaft support bearings 73 and the pipes 98 close to each other in a limited space between the intake valves 47 and the exhaust valves 48 are arranged around the cylinder head 31 The suction-side shaft support bearings can be made as compact and easy as possible 73 easy to edit as the pipes 98 from the cylinder head 31 are separated.

Because the intake ducts 36 and the intake-side rocker arm shaft 71 are each arranged in positions that the intake valves 47 The intake ducts can sandwich between them, as can be seen in a side view 36 at an acute angle with respect to the cylinder axis C be arranged so that the intake-side rocker arm shaft 71 no further than the intake valves 47 on the side of the intake ducts 36 is arranged, which leads to a reduction in intake resistance, so that an increased power of the internal combustion engine e can be achieved.

Because the screws 100 that are the open ends of the holes 99 seal which in the cylinder head 31 defined and on the side of the head cover 32 are open when viewed from the direction along the cylinder axis C adjacent to the pipes 98 are arranged, the screws 100 closer to the pipes 98 be arranged as the pipes 98 from the cylinder head 31 are separated, causing the cylinder head 31 is light and compact.

Furthermore, the grooves 77 and 78 , in which the lower parts of the intake-side rocker arms 57 and the exhaust-side rocker arm 58 are mounted in the shaft support bearings on the intake side 73 and the exhaust-side shaft support bearings 74 Are defined. The pipes 98 are each arranged such that at least sections of the grooves 77 and 78 that the pipe 98 in the direction along the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 are closest, in the two imaginary levels PL2 are present, which through opposite end edges of the tube 98 in the direction along the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 run and which are perpendicular to the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 extend. Thus, in addition to the fact that when machining the grooves 77 and 78 no impairment of the passages 80a occurs in the head, the pipes 98 and the grooves closest to the pipes 77 and 78 in the direction along the axes of the intake-side and exhaust-side rocker arm shafts 71 and 72 be brought closer to each other, creating the cylinder head 31 is lighter and more compact.

Despite the above description of the embodiment of the present invention, the present invention is not limited to the above embodiment, but various design changes can be made without departing from the invention as defined in the claims.

LIST OF REFERENCE NUMBERS

18

motor body

28

crankshaft

31

cylinder head

36

intake port

37

exhaust duct

39

air filter

47

intake valve

48

exhaust valve

51

Valve actuation mechanism

57

intake-side rocker arm

58

exhaust rocker arm

71

intake-side rocker arm shaft

72

exhaust rocker arm shaft

73

intake-side shaft support bearing

74

exhaust-side shaft support bearing

77, 78

groove

80

Secondary air supply passage

80a

Passage in the head

98

pipe

99

opening

100

screw

C

cylinder axis

e

internal combustion engine

F

body frame

PL2

imaginary level

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• JP 2004285979 [0003]

Claims (5)

Internal combustion engine for a semitrailer vehicle, in which a cylinder head (31) serves as part of an engine body (18) attached to a body frame (F), the cylinder head (31) having defined intake openings (36) and exhaust gas openings (37) therein, the Cylinder head (31) also has intake valves (47) and exhaust valves (48) which are arranged to be openable and closable therein, an intake-side rocker arm shaft (71) and an exhaust-side rocker arm shaft (72) as part of a valve actuation mechanism (51) for opening and closing of the intake valves (47) and the exhaust valves (48) serve and run parallel to a crankshaft (28), the intake-side rocker arm shaft (71) and the exhaust-side rocker arm shaft (72) on a plurality of intake-side shaft support bearings (73) and a plurality of exhaust-side shaft support bearings (74) are stored, which are arranged in the cylinder head (31), and a secondary air feed passage (80) between one Air filter (39) arranged above the engine body (18) and the exhaust gas openings (37), characterized in that passages in the head (80a) of the secondary air feed passage (80), which are arranged in the cylinder head (31), are at least partially in each case in tubes (98) are defined separately from the cylinder head (31), and the tubes (98) when viewed from a direction along a cylinder axis (C) in respective positions adjacent to shaft support bearings (73) of the suction-side shaft support bearings (73) or the exhaust-side shaft support bearings ( 74) are arranged. Internal combustion engine for a semi-trailer Claim 1 , wherein the intake side rocker shaft (71) and the exhaust side rocker shaft (72) are arranged in respective positions which are offset from the intake valves (47) and the exhaust valves (48) in a vehicle width direction, and the one shaft support bearing (73) and the pipes (98) when viewed in side view in adjacent positions between the intake valves (47) and the exhaust valves (48) are arranged. Internal combustion engine for a semi-trailer Claim 1 or 2 wherein the suction ports (36) and the suction-side rocker arm shaft (71) are arranged in positions which the suction valves (47) place between them when viewed in side view. Internal combustion engine for a semitrailer vehicle according to one of the Claims 1 to 3 wherein screws (100) which close open ends of openings (99) defined in the cylinder head (31) and opened towards the side of the head cover (32) when viewed from the direction along the cylinder axis (C) adjacent to the tubes (98) are arranged. Internal combustion engine for a semitrailer vehicle according to one of the Claims 1 to 4 , Lower parts of intake-side rocker arms (57) and exhaust-side rocker arms (58), which are pivotably mounted on the intake-side rocker arm shaft (71) and the exhaust-side rocker arm shaft (72), in the intake-side shaft support bearings (73) and the exhaust-side shaft support bearings (74 ) defined grooves (77, 78) are mounted, and the tubes (98) are each arranged in such a way that at least sections of grooves from the plurality of grooves (77, 78), which the tube (98) in a direction along the axes of the suction-side and exhaust-side rocker arm shafts (71, 72) are closest, within two imaginary planes (PL2) which run through opposite end edges of the tube (98) in the direction along the axes of the suction-side and exhaust-side rocker arm shafts (71, 72), the imaginary planes (PL2) extending perpendicular to the axes of the intake-side and exhaust-side rocker arm shafts (71, 72).

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