JP2005076487A - Cylinder head of multi-cylinder engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the need for the conventional seal member to reduce the number of parts and assembly man-hours, by providing structure in which a flange mounting bolt does not passes through a blowby gas passage, to uniform fastening surface pressure of the flange mounting bolt, by uniforming mounting(fastening) pitches of mounting flanges of an intake manifold, and to make a whole engine compact, by shortening the whole length of the mounting flange, in a cylinder head of a multi-cylinder engine. <P>SOLUTION: Cylinders of the multi-cylinder engine are arranged at equal intervals in a cylinder row direction. A head mounting boss part having a head mounting hole through which a head mounting bolt is inserted is disposed at the center between the cylinders. The flange mounting boss part is offset and disposed inside the head mounting boss part. Offset amounts of the head mounting boss part and the flange mounting boss are increased, as they are separated from the center between the cylinders in the cylinder row direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylinder head of a multi-cylinder engine, and more particularly to a cylinder head of a multi-cylinder engine having a flange mounting boss portion to which a mounting flange of an intake manifold is mounted and a blow-by gas passage.

  In a multi-cylinder engine of a vehicle, a cylinder head is fixed to a cylinder block by a head mounting bolt, and this cylinder head is provided with a blow-by gas passage that is directed vertically between the cylinders, and an intake manifold is mounted on a wall surface. A flange mounting boss for mounting the flange is provided.

  10 and 11, reference numeral 102 denotes a multi-cylinder engine (first to fourth cylinders (# 1 to # 4)) mounted on a vehicle (not shown), 104 denotes a cylinder block, and 106 denotes this cylinder block. The cylinder head is fixed to the cylinder block 104 by a head mounting bolt (not shown). In the engine 102, the first to fourth cylinders (# 1 to # 4) are arranged in series in the longitudinal direction X that is the cylinder row direction, and the first to fourth cylinders (# 1 to # 4) of the first to fourth cylinders (# 1 to # 4) are arranged. The first to third cylinder pitches P1 to P3 between the fourth cylinder axes C1 to C4 are set at predetermined intervals.

  The cylinder head 106 is manufactured by casting, and as shown in FIG. 10, the width direction Y is shorter than the longitudinal direction X that is the cylinder row direction of the first to fourth cylinders (# 1 to # 4), and is substantially in plan view. An intake side wall 108 and an exhaust side wall 110 which are formed in a long rectangular shape and are located on both sides in the width direction Y and are oriented in the longitudinal direction X, and are connected to both ends of the intake side wall 108 and the exhaust side wall 110 in the width direction Y. It is comprised by the one end wall 112 and the other end wall 114 which are directed to.

  As shown in FIGS. 10 and 11, the cylinder head 106 communicates with the combustion chamber (not shown) on the intake side wall 8 side to correspond to the first to fourth cylinders (# 1 to # 4). The intake side flange mounting surface 118 is formed by the wall surfaces of the fourth intake ports 116-1 to 116-4 and the intake side wall 108, and the exhaust ports corresponding to the respective cylinders communicate with the combustion chamber on the exhaust side wall 110 side. (Not shown) and an exhaust side flange mounting surface (not shown) are formed by the wall surface of the exhaust side wall 110.

  The intake side flange mounting surface 118 is provided with first to fourth flange mounting seats 120-1 to 120-4 around the first to fourth intake ports 116-1 to 116-4. The mounting flange is attached with a plurality of flange mounting bolts.

  As shown in FIG. 10, the upper part of the cylinder head 106 is parallel to the one end wall 112 and the other end wall 114 and at positions corresponding to the first to fourth cylinders (# 1 to # 4). Four bearing portions 122-1 to 122-4 are provided, and the first to fourth cylinders (# 1 to # 4) are provided at the central portions of the first to fourth bearing portions 122-1 to 122-4. Corresponding to the first to fourth plug cylinders 124-1 to 124-4 are provided integrally with the first to fourth bearing parts 122-1 to 122-4, respectively.

  Further, in the upper part of the cylinder head 106, as shown in FIG. 10, corresponding to the first cylinder (# 1), a pair of first intake one-side tappet walls 126- connected to the first bearing portion 122-1. A 1A first intake other side tappet wall 126-1B and a pair of first exhaust one side tappet walls 126-1C and a first exhaust other side tappet wall 126-1D are provided. Corresponding to the second cylinder (# 2), a pair of second intake one side tappet walls 126-2A, a second intake other side tappet wall 126-2B, and a pair of 2 Exhaust one side tappet wall 126-2C and 2nd exhaust other side tappet wall 126-2D are provided. Corresponding to the third cylinder (# 3), a pair of third intake one-side tappet walls 126-3A, a third intake other-side tappet wall 126-3B, and a pair of first intake pipes 126-3B connected to the third bearing portion 122-3. 3 exhaust 1 side tappet wall 126-3C and 3rd exhaust other side tappet wall 126-3D are provided. Then, corresponding to the fourth cylinder (# 4), a pair of fourth intake one-side tappet walls 126-4A, a fourth intake other-side tappet wall 126-4B, and a pair connected to the fourth bearing portion 122-4. The fourth exhaust one side tappet wall 126-4C and the fourth exhaust other side tappet wall 126-4D are provided.

  In the cylinder head 106, as shown in FIG. 10, one end portion in the longitudinal direction X on the first cylinder (# 1) side is inserted through a head mounting bolt (not shown) from the upper surface 106A to the lower surface 106B. In the first head mounting row 128-1 oriented in the width direction Y, the first intake side, the first exhaust side head mounting provided with the first intake side, the first exhaust side head mounting holes 130-1A, 130-1B. Boss portions 132-1A and 132-1B are provided. In the second head mounting row 128-2 oriented in the width direction Y at the central portion between the first cylinder (# 1) and the second cylinder (# 2), the second intake side, second exhaust side head mounting hole 130- Second intake side and second exhaust side head mounting bosses 132-2A and 132-2B provided with 2A and 130-2B are provided. In the third head mounting row 128-3 oriented in the width direction Y at the central portion between the second cylinder (# 2) and the third cylinder (# 3), the third intake side, the third exhaust side head mounting hole 130- Third intake side and third exhaust side head mounting boss portions 132-3A and 132-3B provided with 3A and 130-3B are provided. In the fourth head mounting row 128-4 oriented in the width direction Y at the central portion between the third cylinder (# 3) and the fourth cylinder (# 4), the fourth intake side, fourth exhaust side head mounting hole 130- Fourth intake side and fourth exhaust side head mounting bosses 132-4A and 132-4B provided with 4A and 130-4B are provided. In the fifth head mounting row 128-5 oriented in the width direction Y at the other end portion in the longitudinal direction X on the fourth cylinder (# 4) side, the fifth intake side, fifth exhaust side head mounting hole 130- Fifth intake side and fifth exhaust side head mounting boss portions 132-5A and 132-5B provided with 5A and 130-5B are provided.

  Although not shown, each head mounting hole 130 is provided with a head mounting bolt for fixing the cylinder head 106 to the cylinder block 104.

  As shown in FIG. 10, the first head mounting center line E1 of the first head mounting row 128-1 passing through the centers of the first intake side and the first exhaust side head mounting holes 130-1A, 130-1B and the second intake air. And the second head mounting center line E2 of the second head mounting row 128-2 passing through the center of each of the second exhaust side head mounting holes 130-2A and 130-2B is separated by a first head mounting pitch Q1. doing. Of the third head mounting row 128-3 passing through the second head mounting center line E2 of the second head mounting row 128-2 and the centers of the third intake side and third exhaust side head mounting holes 130-3A and 130-3B. The third head mounting center line E3 is spaced at a second head mounting pitch Q2. Of the fourth head mounting row 128-4 passing through the third head mounting center line E3 of the third head mounting row 128-3 and the centers of the fourth intake side and fourth exhaust side head mounting holes 130-4A, 130-4B. The fourth head mounting center line E4 is spaced at a third head mounting pitch Q3. The fifth head mounting row 128- passes through the fourth head mounting center line E4 of the fourth head mounting row 128-4 and the centers of the fifth intake side and fifth exhaust side head mounting holes 130-5A and 130-5B. The fifth head mounting center line E5 is spaced at a fourth head mounting pitch Q4.

  As shown in FIG. 11, on the intake manifold mounting surface 118 of the cylinder head 106, the first flange mounting oriented in the vertical direction at one end portion in the longitudinal direction X of the cylinder head 106, which is one side of the first intake port 116-1. In the row 134-1, the first upper side and the first lower side flange mounting boss portions 138-1A and 138-1B having the first upper side and the first lower side flange mounting holes 136-1A and 136-1B are provided. Yes. The second upper side and second lower side flange mounting hole 136 is a second flange mounting row 134-2 oriented vertically on one side of the second intake port 116-2 that is the other side of the first intake port 116-1. -2A and 136-2B are provided with second upper and second lower flange mounting boss portions 138-2A and 138-2B. In the third flange mounting row 134-3 oriented in the vertical direction on one side of the third intake port 116-3, which is the other side of the second intake port 116-2, a third upper side, third lower flange mounting hole 136 is provided. Third upper and third lower flange mounting boss portions 138-3A and 138-3B provided with -3A and 136-3B are provided. A fourth flange mounting row 134-4 oriented vertically on one side of the fourth intake port 116-4, which is the other side of the third intake port 116-3, has a fourth upper and fourth lower flange mounting hole 136. The fourth upper and fourth lower flange mounting boss portions 138-3A and 138-3B having -3A and 136-3B are provided. The fifth upper and fifth lower flanges are arranged at the fifth flange mounting row 134-5 oriented vertically in the other end portion in the longitudinal direction X of the cylinder head 106 on the other side of the fourth intake port 116-4. Fifth upper and fifth lower flange mounting boss portions 138-3A and 138-3B having mounting holes 136-3A and 136-3B are provided.

  As shown in FIG. 11, the first flange mounting center line F1 of the first flange mounting row 134-1 passing through the centers of the first upper and second lower flange mounting holes 136-1A and 136-1B is the cylinder head 6 Is located on the one end wall 112 side. The second flange attachment center line F2 of the second flange attachment row 134-2 passing through the centers of the second upper and second lower flange attachment holes 136-2A, 136-2B is identical to the second head attachment center line E2. I'm doing it. The third flange mounting center line F3 of the third flange mounting row 134-3 passing through the centers of the third upper and third lower flange mounting holes 136-3A and 136-3B is identical to the third head mounting center line E3. I'm doing it. The fourth flange mounting center line F4 of the fourth flange mounting row 134-4 passing through the centers of the fourth upper and fourth lower flange mounting holes 136-4A and 136-4B is identical to the fourth head mounting center line E4. I'm doing it. The fifth flange mounting center line F5 of the fifth flange mounting row 134-5 that passes through the centers of the fifth upper and fifth lower flange mounting holes 136-5A and 136-5B is on the other end wall 114 side of the cylinder head 6. Is located.

  The first flange mounting pitch R1 between the first flange mounting center line F1 and the second flange mounting center line F2, and the fourth flange mounting pitch R4 between the fourth flange mounting center line F4 and the fifth flange mounting center line F5 are: Are set identically. The second flange mounting pitch R2 between the second flange mounting center line F2 and the third flange mounting center line F3 and the third flange mounting pitch R3 between the third flange mounting center line F3 and the fourth flange mounting center line F4 are: Are set identically. Here, the second flange mounting pitch R2 (or the third flange mounting pitch R3)> the first flange mounting pitch R1 (or the fourth flange mounting pitch R4).

  Although not shown, each flange mounting hole 136 is provided with a flange mounting bolt for mounting a mounting flange of the intake manifold.

  On the intake side of the cylinder head 106, as shown in FIGS. 10 and 11, the first cylinder (# 1) and the second cylinder (# 2) A first intake side blow-by gas passage 142-1 including a first upper passage 140-1A and a first lower passage 140-1B is formed, and the second cylinder (# 2) and the third cylinder (# 3) A second intake side blow-by gas passage 142-2 including a second upper passage 140-2A and a second lower passage 140-2B is formed between the third cylinder (# 3) and the fourth cylinder. (# 4) is formed with a third intake side blow-by gas passage 142-3 including a third upper passage 140-3A and a second lower passage 140-3B.

  Further, on the exhaust side of the cylinder head 106, as shown in FIGS. 10 and 11, between the first cylinder (# 1) and the second cylinder (# 2) so as to penetrate from the upper surface 106A to the lower surface 106B. The first exhaust side blow-by gas passage 144-1 is formed, and the second exhaust side blow-by gas passage 144-2 is formed between the second cylinder (# 2) and the third cylinder (# 3). Furthermore, a third intake side blow-by gas passage 144-3 is formed between the third cylinder (# 3) and the fourth cylinder (# 4).

  The first intake side blow-by gas passage 142-1 is located in the vicinity of the second intake side head mounting boss portion 138-2A of the second flange mounting row 134-2 and on the intake side flange mounting surface 118 side of the wall surface. It is located on the head mounting center line E2. The first exhaust side blow-by gas passage 144-1 is located in the vicinity of the second exhaust side head mounting boss portion 138-2B of the second flange mounting row 134-2 and on the exhaust side flange mounting surface side of the wall surface. Two head mounting center line E2 is located.

  The second intake side blow-by gas passage 142-2 is located in the vicinity of the third intake side head mounting boss 138-3A of the third flange mounting row 134-3 and on the intake side flange mounting surface 118 side of the wall surface. It is located on the head mounting center line E3. The second exhaust side blow-by gas passage 144-2 is located in the vicinity of the third exhaust side head mounting boss portion 138-3B of the third flange mounting row 134-3 and on the exhaust side flange mounting surface side of the wall surface. It is located on the 3 head mounting center line E3.

  The third intake side blow-by gas passage 142-3 is located near the fourth intake side head mounting boss 138-4A of the fourth flange mounting row 134-4 and on the intake side flange mounting surface 118 side of the wall surface. It is located on the head mounting center line E4. The third exhaust side blow-by gas passage 144-3 is located in the vicinity of the fourth exhaust side head mounting boss 138-4B of the fourth flange mounting row 134-4 and on the exhaust side flange mounting surface side of the wall surface. It is located on the 4-head mounting center line E4.

  Further, on the intake side of the cylinder head 106, the first central portion of the first to fourth intake ports 116-1 to 116-4 above the port opening and the first to fourth cylinders (# 1 to # 4). First to fourth fuel injection valve mounting boss portions 148-1 to 148-4 provided with first to fourth fuel injection valve mounting holes 146-1 to 146-4 on the first to fourth cylinder axes C1 to C4. Is provided.

Conventionally, a thick part is provided around the blow-by gas passage in the cylinder head of the engine, and a mounting boss for attaching equipment is provided on this thick part, so that the hot water around the mounting boss during casting is reduced. There are things that make it better.
JP 2000-329000 A

  By the way, in a conventional cylinder head of a multi-cylinder engine, as shown in FIGS. 10 and 11, in particular, a second flange mounting row and a first blow-by gas passage among a plurality of flange mounting rows to which a mounting flange of an intake manifold is attached. Are disposed at the same position, and the fourth flange mounting row and the third blow-by gas passage among the plurality of flange mounting rows are disposed at the same position. Each flange mounting bolt attached in a row penetrates the first and third blow-by gas passages, and therefore a seal member is required for each flange mounting bolt attached to the second and fourth flange mounting rows. As the number of points increased, the assembly man-hours increased.

  In addition, when the flange mounting seats are arranged outside the cylinder head so that the flange mounting bolts do not penetrate the first and third blow-by gas passages, the intake manifold mounting flange extends from the outer surface of the cylinder head. For this reason, the mounting (fastening) pitch of the mounting flange of the intake manifold becomes uneven, the tightening surface pressure of the flange mounting bolt becomes uneven, and the overall length of the mounting flange of the intake manifold is long. This resulted in the inconvenience that the entire engine became larger.

  The present invention includes a blow-by gas passage fixed to a cylinder block of a multi-cylinder engine by a head mounting bolt and directed vertically between the cylinders of the multi-cylinder engine, and a mounting flange of an intake manifold is mounted on a wall surface. A cylinder head of a multi-cylinder engine having a flange mounting boss portion, wherein each cylinder of the multi-cylinder engine is arranged at equal intervals in a cylinder row direction, and the head mounting bolt is inserted in the center between the cylinders. A head mounting boss having a mounting hole is disposed, and the flange mounting boss is offset inside the head mounting boss, and an offset amount between the head mounting boss and the flange mounting boss is set. The number of cylinders is increased with increasing distance from the center in the cylinder row direction.

  In the cylinder head of the multi-cylinder engine according to the present invention, a head mounting boss portion having a head mounting hole through which a head mounting bolt is inserted is disposed in the center between the cylinders, and a flange mounting boss portion is provided inside the head mounting boss portion. Since the offset amount between the head mounting boss portion and the flange mounting boss increases as the distance from the center in the cylinder row direction of each cylinder increases, the flange mounting bolt does not penetrate the blow-by gas passage. This eliminates the need for a conventional seal member, reduces the number of parts, reduces the number of assembly steps, makes the mounting flange mounting (clamping) pitch uniform, and tightens the flange mounting bolts. The surface pressure can be made uniform, and the overall length of the mounting flange can be shortened to make the entire engine more compact.

The present invention achieves the object of downsizing the entire engine by changing the offset amount between the head mounting boss and the flange mounting boss.
Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 7 show a first embodiment of the present invention.

  1 to 5, reference numeral 2 denotes a multi-cylinder engine (first to fourth cylinders (# 1 to # 4)) mounted on a vehicle (not shown), 4 denotes a cylinder block, and 6 denotes this cylinder block. 4 is a cylinder head fixed to a head mounting bolt (not shown). In the engine 2, the first to fourth cylinders (# 1 to # 4) are arranged in series in the longitudinal direction X that is the cylinder row direction, and the first to fourth cylinders (# 1 to # 4) of the first to fourth cylinders (# 1 to # 4) are arranged. The first to third cylinder pitches P1 to P3 between the fourth cylinder axes C1 to C4 are arranged in the longitudinal direction X at equal intervals.

  The cylinder head 6 is manufactured by casting, and the width direction Y is shorter than the longitudinal direction X, which is the cylinder row direction of the first to fourth cylinders (# 1 to # 4), and is formed in a substantially rectangular shape in plan view. The intake side wall 8 and the exhaust side wall 10 that are located on both sides in the width direction Y and are directed in the longitudinal direction X, and one end wall 12 that is connected to both ends of the intake side wall 8 and the exhaust side wall 10 and is directed in the width direction Y And the other end wall 14.

  As shown in FIGS. 1, 2, 6, and 7, the cylinder head 6 is formed with a combustion chamber 16 that is open on the lower surface 6 </ b> B, and communicates with the combustion chamber 16 on the intake side wall 8 side. First to fourth intake ports 18-1 to 18-4 corresponding to the fourth cylinders (# 1 to # 4) and an intake side flange mounting surface 20 which is a wall surface of the intake side wall 8 are formed, and the exhaust side wall is formed. Each exhaust port 22 corresponding to each cylinder and an exhaust side flange mounting surface 24 which is a wall surface of the exhaust side wall 10 are formed in communication with the combustion chamber 16 on the 10 side.

  As shown in FIGS. 1 and 2, the intake-side flange mounting surface 20 includes first to fourth flange mounting seats 20-1 to 20-4 around the first to fourth intake ports 18-1 to 18-4, and A lower connecting mounting seat 20-5 is formed integrally with the first to fourth flange mounting seats 20-1 to 20-4. A gap CL is provided between the second to fourth flange mounting seats 20-2 to 20-4 and the lower connecting mounting seat 20-5. The lower connecting mounting seat 20-5 will be described in detail. A second lower flange mounting boss portion 52-2B and a third lower flange mounting boss portion 52-3B to be described later are in the longitudinal direction of the cylinder head 6. Are connected via a first rib 74-1 extending linearly along the length of the third lower flange mounting boss portion 52-3B, the fourth lower flange mounting boss portion 52-4B, and the length of the cylinder head 6. The fourth lower flange mounting boss portion 52-4B and the fifth lower flange mounting boss portion 52-5B are connected to each other through the second rib 74-2 extending linearly along the direction. The fifth lower flange mounting boss portion 52-5B and the fifth upper flange mounting boss portion 52-5A are connected to each other via a third rib 74-3 extending linearly along the longitudinal direction of the cylinder. In the vertical direction of the head 6 It is connected via a fourth rib 74-4 which is formed to be curved outwardly me.

  As shown in FIG. 5, an attachment flange 28 of the intake manifold 26 is attached to the intake side flange attachment surface 20 with a plurality of flange attachment bolts 30. Further, although not shown, an exhaust manifold mounting flange is mounted on the exhaust side flange mounting surface 24 with a plurality of flange mounting bolts.

  As shown in FIGS. 3 to 5, the upper portion of the cylinder head 6 is parallel to the one end wall 12 and the other end wall 14 and at positions corresponding to the first to fourth cylinders (# 1 to # 4). The first to fourth bearing portions 32-1 to 32-4 are provided, and the first to fourth cylinders (# 1 to 4) are provided at the central portions of the first to fourth bearing portions 32-1 to 32-4. First to fourth plug cylinder portions 34-1 to 34-4 corresponding to # 4) are provided integrally with the first to fourth bearing portions 32-1 to 32-4.

  Further, in the upper part of the cylinder head 6, as shown in FIGS. 3 and 4, a pair of first intake one-side tappets connected to the first bearing portion 32-1 corresponding to the first cylinder (# 1). A wall 36-1A, a first intake other side tappet wall 36-1B, and a pair of first exhaust one side tappet walls 36-1C and a first exhaust other side tappet wall 36-1D are provided. Corresponding to the second cylinder (# 2), a pair of second intake one-side tappet walls 36-2A, a second intake other-side tappet wall 36-2B, and a pair of first intake pipes 32-2 connected to the second bearing portion 32-2. 2 Exhaust one side tappet wall 36-2C and 2nd exhaust other side tappet wall 36-2D are provided. Corresponding to the third cylinder (# 3), a pair of third intake one-side tappet walls 36-3A, a third intake other-side tappet wall 36-3B, and a pair of first intake pipes 36-3B connected to the third bearing portion 32-3. 3 exhaust 1 side tappet wall 36-3C and 3rd exhaust other side tappet wall 36-3D are provided. Then, corresponding to the fourth cylinder (# 4), a pair of fourth intake one-side tappet walls 36-4A, a fourth intake other-side tappet wall 36-4B, and a pair connected to the fourth bearing portion 32-4. The fourth exhaust one side tappet wall 36-4C and the fourth exhaust other side tappet wall 36-4D are provided.

  A pair of first intake one-side tappet walls 36-1A and first intake other-side tappet walls 36-1B and a pair of first exhaust one-side tappet walls 36-1C and first exhaust corresponding to the first cylinder (# 1). The other side tappet wall 36-1D includes a pair of first intake one side tappets 38-1A and a first intake other side tappet 38-1B and a pair of first exhaust one side tappets 38-1C and first exhaust other side tappets. 38-1D is provided. A pair of second intake one-side tappet walls 36-2A and a second intake other-side tappet wall 36-2B and a pair of second exhaust one-side tappet walls 36-2C and second exhaust corresponding to the second cylinder (# 2). The other side tappet wall 36-2D includes a pair of second intake one side tappets 38-2A, a second intake other side tappet 38-2B, and a pair of second exhaust one side tappets 38-2C, second exhaust other side tappets. 38-2D is provided. A pair of third intake one-side tappet walls 36-3A and a third intake other-side tappet wall 36-3B and a pair of third exhaust one-side tappet walls 36-3C and third exhaust corresponding to the third cylinder (# 3) The other side tappet wall 36-3D includes a pair of third intake one side tappets 38-3A and a third intake other side tappet 38-3B and a pair of third exhaust one side tappets 38-3C and a third exhaust other side tappet. 38-3D is provided. The pair of fourth intake one side tappet walls 36-4A and the fourth intake other side tappet wall 36-4B and the pair of fourth exhaust one side tappet walls 36-4C corresponding to the fourth cylinder (# 4) The 4 exhaust other side tappet wall 36-4D includes a pair of fourth intake one side tappets 38-4A, a fourth intake other side tappet 38-4B, and a pair of fourth exhaust one side tappets 38-4C, fourth exhaust, etc. A side tappet 38-4D is provided.

  On the intake side of the upper part of the cylinder head 6, as shown in FIGS. 2 to 5, a pair of first intake one side tappet walls 36-1A and a first intake other side tappet wall 36-1B The first one-side oil reservoir wall 40-1A and the first other-side oil reservoir wall 40-1B are connected to the first bearing portion 32-1. Around the pair of second intake one-side tappet walls 36-2A and second intake other-side tappet walls 36-2B, a pair of second one-side oil reservoir walls 40-2A and second other-side oil reservoir walls 40-2B Is connected to the second bearing portion 32-2. Around the pair of third intake one-side tappet walls 36-3A and third intake other-side tappet walls 36-3B, a pair of third one-side oil reservoir walls 40-3A and third other-side oil reservoir walls 40-3B Is connected to the third bearing portion 32-3. A pair of fourth one-side oil reservoir walls 40-4A and a fourth other-side oil reservoir wall 40 are disposed around the pair of fourth intake one-side tappet walls 36-4A and the fourth intake other-side tappet wall 36-4B. -4B is connected to the fourth bearing portion 32-4. Specifically, the first one-side oil reservoir wall 40-1A connects one side wall of the first plug cylinder part 34-1 and the other side wall of the first head mounting boss part 46-1 described later and the first intake air. The first side oil reservoir wall 40-1B is formed so as to surround the center side of the one side tappet wall 36-1A, and the other side wall of the first plug cylinder part 34-1 and a second head mounting boss part described later. It is formed to connect one side wall of 46-2 and surround the center side of the first intake other side tappet wall 36-1B. Second second oil reservoir wall 40-2A, second other oil reservoir wall 40-2B, third first oil reservoir wall 40-3A, third other oil reservoir wall 40-3B, fourth first oil reservoir wall Since the wall 40-4A and the fourth other-side oil reservoir wall 40-4B are also formed in the same manner, detailed description thereof is omitted here.

  In the cylinder head 6, as shown in FIGS. 1 to 4, the longitudinal direction X on the first cylinder (# 1) side is inserted through a head mounting bolt (not shown) from the upper surface 6 A to the lower surface 6 B. In the first head mounting row 42-1 oriented in the width direction Y at one end portion of the first intake side, the first intake side provided with the first exhaust side head mounting holes 44-1A, 44-1B, the first exhaust. Side head mounting boss portions 46-1A and 46-1B are provided. In the second head mounting row 42-2 oriented in the width direction Y at the central portion between the first cylinder (# 1) and the second cylinder (# 2), the second intake side, second exhaust side head mounting hole 44- Second intake side and second exhaust side head mounting bosses 46-2A and 46-2B provided with 2A and 44-2B are provided. In the third head mounting row 42-3 oriented in the width direction Y at the central portion between the second cylinder (# 2) and the third cylinder (# 3), the third intake side, third exhaust side head mounting hole 44- Third intake side and third exhaust side head mounting boss portions 46-3A and 46-3B provided with 3A and 44-3B are provided. In the fourth head mounting row 42-4 oriented in the width direction Y at the central portion between the third cylinder (# 3) and the fourth cylinder (# 4), the fourth intake side, fourth exhaust side head mounting hole 44- Fourth intake side and fourth exhaust side head mounting boss portions 46-4A and 46-4B provided with 4A and 44-4B are provided. In the fifth head mounting row 42-5 oriented in the width direction Y at the other end portion in the longitudinal direction X on the fourth cylinder (# 4) side, the fifth intake side, fifth exhaust side head mounting hole 44- Fifth intake side and fifth exhaust side head mounting boss portions 46-5A and 46-5B provided with 4A and 44-4B are provided.

  Although not shown, each head mounting hole 44 is provided with a head mounting bolt through which the cylinder head 6 is fixed to the cylinder block 6. Therefore, a head mounting boss portion 46 having a head mounting hole 44 through which a head mounting bolt is inserted is disposed in the center between the cylinders.

  As shown in FIGS. 3 and 4, the first head mounting center line E1 of the first head mounting row 42-1 passing through the centers of the first intake side and first exhaust side head mounting holes 44-1A, 44-1B and The first head mounting pitch is between the second head mounting center line E2 of the second head mounting row 42-2 passing through the centers of the second intake side and second exhaust side head mounting holes 44-2A, 44-2B. They are separated by Q1. Of the third head mounting row 42-3 passing through the second head mounting center line E2 of the second head mounting row 42-2 and the centers of the third intake side and third exhaust side head mounting holes 44-3A, 44-3B. The third head mounting center line E3 is spaced at a second head mounting pitch Q2. Of the fourth head mounting row 42-4 passing through the third head mounting center line E3 of the third head mounting row 42-3 and the centers of the fourth intake side and fourth exhaust side head mounting holes 44-4A, 44-4B. The fourth head mounting center line E4 is spaced at a third head mounting pitch Q3. The fifth head mounting row 42-passing through the fourth head mounting center line E4 of the fourth head mounting row 42-4 and the centers of the fifth intake side and fifth exhaust side head mounting holes 44-5A and 44-5B. The fifth head mounting center line E5 is spaced at a fourth head mounting pitch Q4.

  The first head mounting pitch Q1, the second head mounting pitch Q2, the third head mounting pitch Q3, and the fourth head mounting pitch Q4 are set to be the same.

  Further, as shown in FIG. 3, the first cylinder axis C1 is located between the first head mounting center line E1 and the second head mounting center line E2. The second cylinder axis C2 is located between the second head mounting center line E2 and the third head mounting center line E3. Therefore, the second head attachment center line E2 is disposed at a position that bisects the space between the first cylinder axis C1 and the second cylinder axis C2. The third cylinder axis C3 is located between the third head mounting center line E3 and the fourth head mounting center line E4. Therefore, the third head mounting center line E3 is the center in the cylinder row direction X of each cylinder, and is disposed at a position that bisects the space between the second cylinder axis C2 and the third cylinder axis C3. ing. The fourth cylinder axis C4 is located in the middle between the fourth head mounting center line E4 and the fifth head mounting center line E5. Therefore, the fourth head mounting center line E4 is disposed at a position that bisects the space between the third cylinder axis C3 and the fourth cylinder axis C4.

  As shown in FIGS. 1 and 2, on the intake manifold mounting surface 20 which is the wall surface of the cylinder head 6, the cylinder head which is one side of the first intake port 18-1 so as to mount the mounting flange 28 of the intake manifold 26. 6 in the first flange mounting row 48-1 oriented in the vertical direction at one end portion in the longitudinal direction X of the first upper side, the first upper side including the first lower flange mounting holes 50-1A and 50-1B, 1 Lower flange mounting bosses 52-1A and 52-1B are provided. A second flange mounting row 48-2 oriented in the vertical direction on one side of the second intake port 18-2, which is the other side of the first intake port 18-1, has a second upper and second lower flange mounting hole 50. -2A and 50-2B are provided with second upper and second lower flange mounting bosses 52-2A and 52-2B. The third upper side, third lower side flange mounting hole 50 is a third flange mounting row 48-3 oriented vertically in one side of the third intake port 18-3, which is the other side of the second intake port 18-2. Third upper and third lower flange mounting bosses 52-3A and 52-3B having -3A and 50-3B are provided. A fourth flange mounting row 48-4 oriented in the vertical direction on one side of the fourth intake port 18-4, which is the other side of the third intake port 18-3, includes a fourth upper side and a fourth lower flange mounting hole 50. 4-3 upper and 4th lower flange mounting boss | hub parts 52-3A and 52-3B provided with -3A and 50-3B are provided. And, at the other end portion in the longitudinal direction X of the cylinder head 6 which is the other side of the fourth intake port 18-4, a fifth flange mounting row 48-5 oriented in the vertical direction has a fifth upper side and a fifth lower flange. Fifth upper and fifth lower flange mounting bosses 52-3A and 52-3B having mounting holes 50-3A and 50-3B are provided.

  As shown in FIGS. 1 and 2, the first flange mounting center line F1 of the first flange mounting row 48-1 passing through the centers of the first upper and first lower flange mounting holes 50-1A and 50-1B is: Only the first mounting offset amount M1 is located on the center side that is inside the cylinder head 6 from the first head mounting center line E1, that is, on the third head mounting row 42-3 side in the center in the longitudinal direction X that is the cylinder row direction. Located offset. The second flange mounting center line F2 of the second flange mounting row 48-2 passing through the centers of the second upper and second lower flange mounting holes 50-2A and 50-2B is more than the second head mounting center line E2. The cylinder head 6 is offset by a second mounting offset amount M2 on the center side inside the cylinder head 6, that is, on the third head mounting row 42-3 side on the center side in the longitudinal direction X that is the cylinder row direction. The third flange mounting center line F3 of the third flange mounting row 48-3 passing through the centers of the third upper and third lower flange mounting holes 50-3A and 50-3B is identical to the third head mounting center line E3. I'm doing it. The fourth flange mounting center line F4 of the fourth flange mounting row 48-4 passing through the centers of the fourth upper and fourth lower flange mounting holes 50-4A and 50-4B is more than the fourth head mounting center line E4. It is offset by the third mounting offset amount M3 on the center side that is the inside of the cylinder head 6, that is, the third head mounting row 42-3 side in the center in the longitudinal direction X that is the cylinder row direction. The fifth flange mounting center line F5 of the fifth flange mounting row 48-5 passing through the centers of the fifth upper and fifth lower flange mounting holes 50-5A and 50-5B is more than the fifth head mounting center line E5. The cylinder head 6 is offset by a fourth mounting offset amount M4 on the center side that is the inner side of the cylinder head 6, that is, on the third head mounting row 42-3 side in the center in the longitudinal direction X that is the cylinder row direction. Here, there is a relationship of first mounting offset amount M1 = fourth mounting offset amount M4> second mounting offset amount M2 = third mounting offset amount M3.

  As shown in FIG. 1, the first flange mounting pitch R1 between the first flange mounting center line F1 and the second flange mounting center line F2, and the second between the second flange mounting center line F2 and the third flange mounting center line F3. Flange mounting pitch R2, third flange mounting pitch R3 between third flange mounting center line F3 and fourth flange mounting center line F4, and fourth between fourth flange mounting center line F4 and fifth flange mounting center line F5. The flange mounting pitch R4 is set to be the same.

  Therefore, the first mounting offset amount M1, the fourth mounting offset amount M4, and the second mounting offset amount M2 = the third mounting offset amount M3 are offset in the longitudinal direction X, which is the cylinder row direction of each cylinder. It is set to increase as the distance from the third head mounting row 42-3 as the center increases. In this case, there is a relationship of M1 (or M4) = M2 (or M3) * 2. Further, between the second cylinder (# 2) and the third cylinder (# 3) between the cylinders on the center side in the longitudinal direction X that is the cylinder row direction of each cylinder, the third flange mounting row 48 and the third cylinder row (# 3) are arranged. The third upper mounting row 42, that is, the third upper side, third lower flange mounting boss portion 52-3A, 52-3B, the third intake side, third exhaust side head mounting boss portion 46-3A, 46-3B is arranged at the central portion between the second cylinder (# 2) and the third cylinder (# 3) on the center side.

  On the intake side of the cylinder head 6, the first upper side is between the first cylinder (# 1) and the second cylinder (# 2) so as to penetrate vertically from the upper surface 6 A to the lower surface 6 B between the cylinders. A first intake side blow-by gas passage 56-1 comprising a passage 54-1A and a first lower passage 54-1B is formed, and between the third cylinder (# 3) and the fourth cylinder (# 4). Thus, a second intake side blow-by gas passage 56-2 including the second upper passage 54-2A and the second lower passage 54-2B is formed.

  The first intake side blow-by gas passage 56-1 is located in the vicinity of the second intake side head mounting boss portion 46-2A of the second flange mounting row 48-2 and on the intake side flange mounting surface 20 side of the wall surface. The passage center line G1 is offset from the second head attachment center line E2 by the first passage offset amount S1 outside the one end side of the cylinder head 6, that is, on the opposite side to the second flange attachment row 48-2. ing. The second intake side blow-by gas passage 56-2 is located in the vicinity of the second intake side head mounting boss portion 46-4A of the fourth flange mounting row 48-4 and on the intake side flange mounting surface 20 side of the wall surface. The passage center line G2 is offset by the second passage offset amount S2 to the outside of the other end side of the cylinder head 6 from the fourth head mounting center line E4, that is, on the opposite side to the fourth flange mounting row 48-4. positioned. Here, there is a relationship of first passage offset amount S1 = second passage offset amount S2.

  In addition, on the wall surface of the intake side flange mounting surface 20 of the cylinder head 6, the upper side of the second upper flange mounting boss portion 52-2A between the first intake port 18-1 and the second intake port 18-2 and A first fuel delivery pipe mounting boss 60-1 having a first fuel delivery pipe mounting hole 58-1 is provided on the inner side, that is, on the third head mounting row 42-3 side, and the third intake port 18- 3 and the fourth intake port 18-4 and obliquely above and inside the fourth upper flange mounting boss portion 52-4A, that is, the third head mounting row 42-3 side, the second fuel delivery pipe mounting hole A second fuel delivery pipe mounting boss 60-2 provided with 58-2 is provided.

  The first pipe attachment center line H1 passing through the center of the first pipe attachment hole 58-1 is the center side inside the cylinder head 6 relative to the second head attachment center line E2, that is, the second flange attachment row 48-2. Is offset by the first pipe offset amount T1. The second pipe attachment center line H2 passing through the center of the second pipe attachment hole 58-2 is the center side of the cylinder head 6 from the fourth head attachment center line E4, that is, the same side as the fourth flange attachment row 48-4. Is offset by the second pipe offset amount T2. Here, there is a relationship of the first pipe offset amount T1 = the second pipe offset amount T2.

  Therefore, as shown in FIG. 1, the first interval U1 between the first pipe attachment center line H1 and the second cylinder axis C2 has a relationship of first interval U1> first pipe offset amount T1. Further, the second interval U2 between the second pipe attachment center line H2 and the fourth cylinder axis C4 is in a relationship of second interval U2> second pipe offset amount T2. Therefore, the relationship is first interval U1 = second interval U2.

  In addition, on the intake side of the cylinder head 6, the first to fourth cylinders (# 1 to # 4) of the first to fourth cylinders (# 1 to # 4) are located at the central portion above each port opening of the first to fourth intake ports 18-1 to 18-4. The first to fourth fuel injection valve mounting bosses 64-1 to 64-4 provided with the first to fourth fuel injection valve mounting holes 62-1 to 62-4 on the first to fourth cylinder axes C1 to C4. Is provided.

  Accordingly, the first and second fuel delivery pipe mounting boss portions 68-1 and 68-2 are second and fourth flange mounting rows than the second and fourth fuel injection valve mounting boss portions 64-2 and 64-4. 42-2 and 42-2 are arranged close to each other.

  As shown in FIG. 5, the first and second fuel delivery pipe mounting boss portions 68-1 and 68-2 include first and second pipe brackets 68-1 and 68-2 of the fuel delivery pipe 66. It attaches with the 2nd pipe attachment bolts 70-1 and 70-2.

  Further, as shown in FIG. 5, the first to fourth fuel injection valves 72-1 to 72-4 are attached to the first to fourth fuel injection valve mounting boss portions 64-1 to 64-4.

  Next, the operation of the first embodiment will be described.

  In the cylinder head 6, as shown in FIGS. 1 to 4, the first to fourth cylinders (# 1 to # 4) are arranged in the longitudinal direction X which is the cylinder row direction, and the pitches P 1 to P 4 between the first to fourth cylinders are equal. A head mounting boss portion 46 having a head mounting hole 44 through which the head mounting bolt 30 is inserted is disposed in the center between the cylinders. In particular, the second and fourth head mounting bosses are provided. The second and fourth flange mounting boss portions 52-2 and 52-4 are arranged offset inside the portions 46-2 and 46-4, and the second and fourth head mounting boss portions 46-2 and 46 are disposed. -4 and the second and fourth flange mounting boss portions 52-2 and 52-4 are offset from the third flange mounting boss portion 52-3, which is the center in the longitudinal direction X that is the cylinder row direction of each cylinder. Since the flange mounting bolt 30 is increased as the distance increases, the first and second flange mounting bolts 30 are provided. The structure does not penetrate the low-by gas passages 56-1 and 56-2, eliminates the need for a conventional sealing member, reduces the number of parts, reduces the number of assembling steps, and attaches (tightens) the mounting flange 28 of the intake manifold 26. A) The pitch can be made uniform, the tightening surface pressure of the flange mounting bolt 30 can be made uniform, and the overall length of the mounting flange 28 can be shortened to make the entire engine more compact.

  The first and second blow-by gas passages 56-1 and 56-2 are arranged offset to the outside of the second and fourth head mounting boss portions 46-2 and 46-4, and the second and fourth Since the flange mounting boss portions 52-1, 52-4 are arranged offset to the inside of the second and fourth head mounting boss portions 46-2, 46-4, the flange mounting bolt 30 and the first, second Interference between the blow-by gas passages 56-1 and 56-2 can be avoided, and the entire length of the mounting flange 28 can be shortened.

  Further, the offset amount M between each flange mounting boss 52 and each head mounting boss portion 46 increases as the distance from the third flange mounting boss 52-3, which is the center in the longitudinal direction X that is the cylinder row direction of each cylinder, increases. As a result, the overall length of the cylinder head 6 can be further shortened.

  Furthermore, second and third fuel injection valve mounting bosses 64-2 and 64-3 are respectively provided in the central portion above each port opening of each intake port 18 corresponding to each cylinder. First and second fuel delivery pipe mounting boss portions 60-1 and 60-2 are disposed inside the head mounting boss portions 46-2 and 46-4, and the first and second fuel delivery pipe mounting boss portions 60 are disposed. -1 and 60-2 are disposed closer to the second and fourth flange mounting boss portions 46-2 and 46-4 than the second and third fuel injection valve mounting boss portions 64-2 and 64-3. Therefore, interference between the first and second fuel delivery pipe mounting boss portions 60-1 and 60-2 and the first and second blow-by gas passages 56-1 and 56-2 can be avoided, and the second , Third fuel injection valves 72-2, 72-3 and first and second fuel delivery pipe mounting bosses The clearance between 60-1 and 60-2, it is possible to improve the assembling performance of the fuel delivery pipe 66.

  That is, in this first embodiment, the first flange mounting row 48-1 is offset from the first head mounting row 42-1 inward by the first offset amount M1, and the fifth flange mounting row 48-5 is located. Is offset from the fifth head mounting row 42-5 inward by a fourth offset amount M4, and the second flange mounting row 48-2 is moved inward from the second head mounting row 42-2 by a second offset amount. The third flange mounting row 48-3 is offset from the third head mounting row 42-3 by the third offset amount M3, and the first offset amount M1 (or the first offset amount M1) is set. 1 offset amount M1) = second offset amount M2 (or third offset amount M3) * 2. Therefore, the conventional offset is equivalent to the second offset amount M2 (or third offset amount M3) * 2. Shortening the length in the longitudinal direction X of the cylinder head 6 than the construction of the cylinder head, the entire mounting flange 28 of the intake manifold 26 can be a compact structure.

  In addition, the first to fourth flange mounting pitches R1 to R4 are substantially equally spaced, and the mounting (clamping) surface pressure distribution of the flange mounting bolt 30 is made uniform, and the second and fourth flange mounting bosses. In the vicinity of 52-2 and 52-4, first and second blow-by gas passages 56-1 and 56-2 are provided offset from the second and fourth head mounting boss portions 46-2 and 46-4 to the opposite side. Therefore, the first and second blow-by gas passages 56-1 and 56-2 and the second and fourth head mounting bosses 46-2 and 46-4 are staggered so that they do not interfere with each other and are sealed. The flange mounting bolt 30 can be tightened without using a member.

  Furthermore, it is not necessary to project the first and second blow-by gas passages 56-1 and 56-2 from the cylinder head 6, and the cylinder head 6 can be made compact.

  Furthermore, since the first and second fuel delivery pipe mounting boss portions 60-1 and 60-2 are mounted offset in the same direction as the second and fourth flange mounting boss portions 48-2 and 48-4, The first and second blow-by passages 56-1 and 56-2 and the first and second fuel delivery pipe mounting boss portions 60-1 and 60-2 are close to each other, but their offset directions are opposite to each other. Therefore, mutual interference can be avoided and a distance from the fuel injection valve 72 can be ensured.

  Further, the first and second fuel delivery pipe mounting boss portions 60-1 and 60-2 do not overlap the first and second blow-by gas passages 56-1 and 56-2 and each fuel injection valve 72. In addition, since a certain clearance can be secured, the assembling property can be improved.

  That is, at the center of the cylinder head 6, each head mounting boss portion 46 is positioned at the center, and the other boss portions are offset toward the center side, and these boss portions are positioned inside by a predetermined offset amount, Since the offset amount = inner offset amount * 2, the mounting flange 28 becomes compact. Therefore, the engine 2 is made compact, the flange mounting pitch R is made uniform, and the mounting (clamping) surface distribution is made uniform. Can be planned. In addition, since the blow-by gas passages 56 are mounted offset to the opposite sides of the boss portions, interference between the flange mounting bolts 30 and the blow-by gas passages 56 can be avoided, and the cylinder head 6 can be made compact. . Further, since the fuel delivery pipe mounting boss portion 60 is mounted offset to the opposite side to the blow-by gas passage 56, interference between the fuel delivery pipe mounting boss portion 60 and the blow-by gas passage 56 is avoided, and the fuel injection valve 72 and A clearance with the fuel delivery pipe mounting boss 60 can be ensured.

  Thereby, in the cylinder head 6 of the engine 2 for multi-cylinder (particularly four cylinders), the flange mounting boss portion 52 and the blow-by gas passage 56 can be configured to be compact and reliable.

  FIG. 8 shows a special configuration of the present invention and shows a second embodiment.

  The features of the second embodiment are as follows. That is, the mounting flange 28 of the intake manifold 26 is provided with second and fourth flange mounting rows 48-2 corresponding to, for example, the first and second intake side blow-by gas passages 56-1 and 56-2 of the cylinder head 6. , 48-4 second and fourth flange mounting bolts 30-2, 30-4 are removed from the first and second intake side blow-by gas passages 56-1, 56-2 (each end side). The first and second bolt head receiving hole portions 84-1 and 84-2 having the first and second bolt head joint inclined surfaces 82-1 and 82-2 that are inclined obliquely are formed. Further, the intake side flange mounting surface 20 of the cylinder head 6 has second and fourth flange mounting bolts 30-2 corresponding to the first and second bolt head receiving holes 84-1 and 84-2, First and second flange inclined mounting holes 86-1 and 86-2 for screwing 30-4 were formed. The first and second bolt head joint inclined surfaces 82-1 and 82-2 are formed in a direction orthogonal to the axial direction of the first and second flange inclined mounting holes 86-1 and 86-2, and the second The heads of the fourth flange mounting bolts 30-2 and 30-4 are brought into surface contact.

  According to the configuration of the second embodiment, the second and fourth flange mounting bolts 30-2 and 30-4 corresponding to the first and second intake side blow-by gas passages 56-1 and 56-2 are the first, The second intake side blow-by gas passages 56-1 and 56-2 are attached outside and the second and fourth flange mounting bolts 30-2 and 30-4 are attached to the first and second intake side blow-by gas passages 56. -1 and 56-2, the seal member is not necessary, and the first and second bolt heads of the first and second bolt head inclined housing holes 84-1 and 84-2 are eliminated. The second and fourth flange mounting bolts 30-2 and 30-4 can be obliquely attached by the joint inclined surfaces 82-1 and 82-2 to be securely attached.

  FIG. 9 shows a special configuration of the present invention and shows a third embodiment.

  The features of the third embodiment are as follows. That is, the first upper to fifth upper flange mounting holes 50-1A to 50-5A and the first lower to fifth lower flange mounting holes 50- in the first to fifth flange mounting rows 48-1 to 48-5. A horizontal direction in which first to fifth flange mounting centerlines F1 to F5 with 1B to 50-5B are directed horizontally through the centers of the first to fourth intake ports 18-1 to 18-5 of the cylinder head 6. For example, the other end side of the cylinder head 6 with respect to the vertical line V orthogonal to the center line L (for the part corresponding to each blow-by gas passage 56, the same as the center line of the blow-by gas passage 56) by an angle θ, for example. Each flange mounting hole 50 is arranged in a rhombus shape around each intake port 18.

  According to the configuration of the third embodiment, the flange mounting bolt 30 can be mounted so as to be disengaged from the first and second intake side blow-by gas passages 56-1 and 56-2, and each flange mounting bolt 30 is mounted on each flange mounting bolt 30. Since it is disposed in the vicinity of the periphery of the intake port 18, the bolt tightening surface pressure can be made strong and uniform around each intake port 18 on the upper and lower sides of the cylinder head 6.

  The structure for reducing the overall engine size by changing the offset amount between the head mounting boss and the flange mounting boss can be applied not only to the vehicle engine but also to other engines.

It is a front view of the cylinder head explaining the dimensional relationship of each part in 1st Example. It is a front view of a cylinder head in the 1st example. It is a top view of the cylinder head explaining the dimensional relationship of each part in the 1st example. It is a top view of a cylinder head in the 1st example. It is a perspective view of a cylinder head in the 1st example. It is a schematic sectional drawing in the longitudinal direction of a cylinder head in 1st Example. It is a schematic sectional drawing in the width direction of a cylinder head in 1st Example. It is a schematic plan view of a cylinder head in 2nd Example. It is a schematic front view of a cylinder head in 3rd Example. It is a top view of a cylinder head in the past. It is a front view of a cylinder head in the past.

Explanation of symbols

2 Engine 4 Cylinder block 6 Cylinder head 18 Intake port 20 Intake side flange mounting surface 26 Intake manifold 28 Mounting flange 32 Bearing portion 42 Head mounting row 46 Head mounting boss portion 48 Flange mounting row 52 Flange mounting boss portion 56 Blow-by gas passage 60 Fuel Delivery pipe mounting boss 64 Fuel injection valve mounting boss 66 Fuel delivery pipe 72 Fuel injection valve

Claims (5)

  A flange mounting boss portion that is fixed to a cylinder block of a multi-cylinder engine by a head mounting bolt and has a blow-by gas passage that is directed vertically between the cylinders of the multi-cylinder engine, and a mounting flange of an intake manifold is mounted on a wall surface In the cylinder head of the multi-cylinder engine provided with the above, each cylinder of the multi-cylinder engine is arranged at equal intervals in the cylinder row direction, and a head mounting hole through which the head mounting bolt is inserted is provided at the center between the cylinders. The head mounting boss is disposed, and the flange mounting boss is offset inside the head mounting boss, and the offset amount between the head mounting boss and the flange mounting boss is set in each cylinder. A cylinder head of a multi-cylinder engine, which is increased as the distance from the center in the cylinder row direction increases.   A flange mounting boss portion that is fixed to a cylinder block of a multi-cylinder engine by a head mounting bolt and has a blow-by gas passage that is directed vertically between the cylinders of the multi-cylinder engine, and a mounting flange of an intake manifold is mounted on a wall surface In the cylinder head of the multi-cylinder engine provided with the above, each cylinder of the multi-cylinder engine is arranged at equal intervals in the cylinder row direction, and a head mounting hole through which the head mounting bolt is inserted is provided at the center between the cylinders. The head mounting boss is disposed, the blow-by gas passage is disposed offset to the outside of the head mounting boss, and the flange mounting boss is offset to the inside of the head mounting boss. A cylinder head of a multi-cylinder engine characterized by   Between the cylinders on the center side in the cylinder row direction of the cylinders, the flange mounting boss portion is disposed at a central portion between the center side cylinders so as to coincide with the head mounting boss portion. The cylinder head of the multi-cylinder engine according to claim 2.   3. The cylinder head of a multi-cylinder engine according to claim 2, wherein an offset amount between the flange mounting boss and the head mounting boss is increased as the distance from the center in the cylinder row direction of each cylinder increases.   A fuel injection valve mounting boss is provided at each central portion of each intake port corresponding to each cylinder above the port opening, and a fuel delivery pipe mounting boss is disposed inside the head mounting boss. 3. A cylinder head of a multi-cylinder engine according to claim 2, wherein a fuel delivery pipe mounting boss is disposed closer to the flange mounting boss than the fuel injection valve mounting boss.

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