JP5528880B2 - Piston cooling device for V-type engine - Google Patents

Description

In the present invention, a first case half is coupled to a cylinder block having a cylinder bore into which a piston is slidably fitted, and a second case half constituting a crankcase together with the first case half is a first case half. The present invention relates to a piston cooling device for a V-type engine, in which an oil jet that injects oil supplied from an oil pump toward the piston is attached to the crankcase.

  A piston, which is composed of an upper case half formed integrally with the cylinder block and a lower case half joined to the upper case half, and is slidably fitted to the cylinder bore of the cylinder block Patent Document 1 discloses an engine piston cooling apparatus in which an oil jet that cools a piston by jetting oil toward a cylinder is provided in a cylinder block.

Japanese Patent Publication No. 7-78366

However, in the one disclosed in Patent Document 1, the oil sucked up by the oil pump from the oil pan coupled to the lower part of the crankcase lubricates the bearing portion of the crankshaft through the lower case half. It is configured to be supplied to the oil jet so as to be guided to the upper case half integral with the cylinder block. However, in such a structure, the oil passage from the oil pump to the oil jet is constituted by a plurality of parts, and there is a problem that the oil passage is complicated and tends to be long.

The present invention has been made in view of such circumstances, and an object thereof is to provide a piston cooling device for a V-type engine in which an oil passage from an oil pump to an oil jet is simplified and shortened. .

To achieve the above object, the present invention, the first and the first case half to the second cylinder blocks arranged to form a V-shape to one another and each have a cylinder bore allowed to fitting the piston slidably And a second case half constituting the crankcase together with the first case half is coupled to the first case half, and an oil jet for injecting oil supplied from an oil pump toward the piston is in the piston cooling device for a V-type engine mounted on the crankcase, a main gallery receiving the oil discharged from the oil pump attached to the second casing halves, the first case half, the first, second A portion located between two cylinder blocks is provided so as to extend along the axis of the crankshaft. Oil supply oil passage communicating with the main gallery via the only connection oil passage, wherein so as to extend along the crankshaft disposed in the second case half, the oil jet, connected to the oil supply passage The first feature is that the second case half is provided as described above .

According to the present invention, in addition to the configuration of the first feature, the oil jet is connected to an oil jet main body attached to the second case half, an oil passage leading to the oil supply oil passage, and a jet leading to the oil passage. A second feature is that a hole is provided.

  In addition to the configuration of the second feature, the third feature of the present invention is that the oil jet main body is detachably attached to the second case half with a fastening member.

The present invention, in addition to the third feature, the oil jet body, a base attached, both the jets hole when that out extending toward the piston side from the base portion provided on the second case half And a second oil provided in the extension through the jet hole to the first oil passage provided in the base so as to communicate with the oil supply oil passage. A fourth feature is that the road is communicated.

  In the present invention, in addition to the configuration of the fourth feature, the second oil passage is formed by plugging an opening end of a bottomed processing hole formed by drilling the extension portion from the side opposite to the tip side. The fifth feature is that the first oil passage that is closed by the first oil passage and communicates with the second oil passage is provided in the base portion so as to extend in a direction intersecting the second oil passage.

  In addition to the configuration of any one of the second to fifth features, the present invention is characterized in that the jet holes are provided at a plurality of locations including the tip of the extension portion.

  In addition to any of the first to third features, the present invention provides a jet hole in which a second oil jet disposed at another position facing the oil jet injects oil toward the piston. And having the first case half provided as a seventh feature.

According to the present invention, in addition to any of the first to third and seventh features, a jet hole provided in the oil jet is disposed in the piston when the piston is at bottom dead center. Thus, an eighth feature is that the oil jet is formed.

In addition to any of the seventh feature of the present invention, the other oil jet is provided in a portion of the first case half located between the first and second cylinder blocks. The ninth feature is communication with the main gallery.

The first cylinder block 24A and the second cylinder block 24B of the embodiment correspond to the cylinder block of the present invention, the cylinder bores 30A and 30B of the embodiment correspond to the cylinder bore of the present invention, and the pistons 31A and 31A of the embodiment 31B corresponds to the piston of the present invention, the feed pump 59 of the embodiment corresponds to the oil pump of the present invention, the first oil jets 146A and 146B of the embodiment correspond to the oil jet of the present invention, and The third oil jets 148A and 148B of the embodiment correspond to other oil jets of the present invention, the first oil supply oil passage 150 of the embodiment corresponds to the oil supply oil passage of the present invention, and the bolt 156 of the embodiment Corresponds to the fastening member of the present invention.

According to the first feature of the present invention, the main gallery for receiving oil discharged from the oil pump attached to the second case half is located between the first and second cylinder blocks of the first case half. An oil supply oil passage that is provided in the portion so as to extend along the axis of the crankshaft and communicates with the main gallery via a connection oil passage provided in the first case half extends along the crankshaft. Since the oil jet is provided in the second case half so as to be connected to the oil supply oil passage, the oil passage from the oil pump to the oil jet is provided. Simplification and shortening can be achieved.

According to a second aspect of the present invention, the oil jet comprises an oil jet main body provided with an oil passage communicating with the oil supply oil passage and a jet hole communicating with the oil passage. Since it is attached to the second case half, the degree of freedom in the injection direction from the oil jet can be increased as compared with the case where the oil jet is directly provided on the crankcase.

  According to the third feature of the present invention, since the oil jet is detachably attached to the second case half, it is possible to replace the oil jet according to the type of the piston, thereby enhancing versatility. be able to.

According to a fourth aspect of the present invention, the oil jet body has a base portion attached to the second case half, and a extending portion are both jet hole is provided when that out extending from the base portion integrally, Since the jet hole communicates with the oil supply oil passage through the oil passage provided in the base portion and the extension portion, the oil can be easily transferred from the second case half to the jet hole.

  According to the fifth aspect of the present invention, the second oil passage directed to the extending portion of the oil jet main body is formed by drilling the extending portion from the side opposite to the tip side. Since the opening end of the hole is closed by a plug, and the first oil passage provided in the base extends in a direction intersecting the second oil passage, the first and second oil passages are separated from each other. After the straight drilling process in step 1, the plug is closed by the plug on the second oil path side, so that the first and second oil paths can be easily formed in the oil jet main body without complicated processing. Can do.

  According to the sixth aspect of the present invention, since the jet holes are provided at a plurality of locations including the tip of the extending portion, the degree of freedom of arrangement of the jet holes can be increased.

  According to the seventh aspect of the present invention, the piston from the second oil jet provided in the first case half so as to be disposed at another position opposed to the oil jet provided on the second case half side. Since the oil is jetted in the direction, the oil jets are distributed and arranged on the first and second case half sides, so that the degree of freedom in arranging the oil jets can be increased regardless of the configuration of the crankcase.

  Further, according to the eighth aspect of the present invention, since the jet hole of the oil jet is located in the piston at the bottom dead center, the oil is surely injected from the jet hole to the inside of the piston. Can improve the cooling ability.

It is a principal part vertical side view of the engine of 1st Embodiment. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a side view of a crankshaft. It is the longitudinal cross-sectional view seen from the same direction as FIG. 3 of a crankshaft. FIG. 5 is a bottom view of the first case half viewed from the direction of arrows 5-5 in FIG. 1. It is a top view of the 2nd case half seen from the 6-6 line arrow direction of FIG. FIG. 7 is a cross-sectional plan view of the pump unit with a part cut away when viewed from the direction of arrows 7-7 in FIG. 1. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. FIG. 9 is a sectional view taken along line 9-9 in FIG. 8. It is a vertical side view of the 10 arrow part of FIG. It is the 11-11 line sectional view of FIG. It is a top view of the oil pan seen from the 12-12 line arrow direction of FIG. FIG. 13 is a sectional view taken along line 13-13 of FIG. It is the figure which looked at the oil level finder from the 14th arrow direction of FIG. FIG. 15 is a cross-sectional view taken along line 15-15 in FIG. 14. FIG. 16 is a cross-sectional view taken along line 16-16 in FIG. 5. FIG. 17 is an enlarged view of a portion indicated by an arrow 17 in FIG. 1. It is an expansion longitudinal cross-sectional view of a 1st oil jet. FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. 18. It is the perspective view which looked at the 2nd oil jet from the 20 arrow direction of FIG. It is sectional drawing of the 3rd oil jet which follows the 21-21 line of FIG. FIG. 22 is a cross-sectional view taken along line 22-22 in FIG. 6. FIG. 23 is a cross-sectional view taken along line 23-23 in FIG. 4. FIG. 24 is a cross-sectional view taken along line 24-24 in FIG. 4. FIG. 18 illustrates a second embodiment and is a cross-sectional view corresponding to FIG. 17.

  Embodiments of the present invention will be described with reference to the accompanying drawings.

  The first embodiment of the present invention will be described with reference to FIGS. 1 to 24. First, in FIGS. 1 and 2, for example, a four-cylinder V-type engine is mounted on a vehicle such as a motorcycle. An engine main body 21 of the engine is coupled to a crankcase 23 that rotatably supports a crankshaft 22 having an axis extending in the left-right direction of the motorcycle, and a first that is coupled to the crankcase 23 on the front side along the traveling direction of the motorcycle. The cylinder block 24A, the first cylinder head 25A coupled to the upper end of the first cylinder block 24A, the first head cover 26A coupled to the upper end of the first cylinder head 25A, and the rear side along the traveling direction of the motorcycle A second cylinder block 24B coupled to the crankcase 23, and an upper end of the second cylinder block 24B Comprising a second cylinder head 25B coupled, and a second head cover 26B that is coupled to the upper end of the second cylinder head 25B, and an oil pan 27 coupled to a lower portion of the crankcase 23.

The crankcase 23 includes, for example, a first case half 28 and a first case half 28 that are integrally coupled to the first and second cylinder blocks 24A and 24B that are arranged in a V shape. The crankshaft 22 is rotatably supported between the first case half 28 and the second case half 29.

  The first cylinder block 24A has two cylinder bores 30A aligned in the direction along the axis of the crankshaft 22, and the second cylinder block 24B is aligned in the direction along the axis of the crankshaft 22 and the first cylinder block 24A. The cylinder bores 30A have two cylinder bores 30B arranged at positions shifted in the axial direction of the crankshaft 22, and are slidably fitted to the cylinder bores 30A of the first cylinder block 24A. Pistons 31A are connected to the crankshaft 22 via connecting rods 32A, and slidably fitted into cylinder bores 30B of the second cylinder blocks 24B, respectively. Pistons 31B are connected via connecting rods 32B. Connected to the crankshaft 22 It is.

  3 and 4, the crankshaft 22 is arranged on a plurality of, for example, a pair of coaxial crankpins 22 a and 22 b and on both outer sides in the axial direction of the crankpins 22 a and 22 b, and the crankcase of the engine body 21. A pair of outer journal portions 22c and 22d that are rotatably supported by 23 and an intermediate journal portion 22e that is disposed between the crank pins 22a and 22b and that is rotatably supported by the crankcase 23 are integrally formed. Have.

  Referring to FIGS. 5 and 6 together, both the outer journal portions 22c and 22d are pivotally supported by the first case half 28 and the second case half 29 that cooperate with the crankcase 23. The support walls 28a, 28b; 29a, 29b that form the shaft holes 33, 34 between each other, and the support walls 28c, 29c that form the shaft holes 35 that support the intermediate journal portion 22e between each other, are crankshafts. A support wall 28c, 29c that is integrally provided along a plane perpendicular to the axis of the shaft 22 and supports the intermediate journal portion 22e; and the support walls 28a, 28b that support the outer journal portions 22c, 22d; Crank chambers 36 and 36 are formed between 29a and 29b.

  A transmission chamber 37 is formed in the crankcase 23 behind the crank chambers 36, and an oil reservoir chamber located below the crank chambers 36 between the crankcase 23 and the oil pan 27. 38 is formed so as to communicate with the transmission chamber 37, and a partition wall 39 is provided in the crankcase 23 that separates the crank chamber 36 from the transmission chamber 37 and the oil reservoir chamber 38.

  The transmission chamber 37 accommodates a constantly meshing gear transmission 40, which has an axis parallel to the crankshaft 22 and has a second case of the crankcase 23. A main shaft 41 that is rotatably supported by the half body 29, and an axis parallel to the main shaft 41, and is rotatably supported between the first and second case half bodies 28, 29 of the crankcase 23. The main shaft 41 includes a counter shaft 42 and a plurality of shift stages provided between the main shaft 41 and the counter shaft 42 to enable selective establishment, for example, a gear train group 43 of six stages. Power from the shaft 22 is input via the clutch 44.

  A drive sprocket 45 is fixed to the end of the countershaft 42 that protrudes from the left side wall of the crankcase 23 in a state in which the motorcycle faces in the traveling direction, and has an endless shape for transmitting power to a rear wheel (not shown). The chain is wound around the drive sprocket 45.

  The clutch 44 is a conventionally known dry-type multi-plate clutch that includes a clutch inner 47 that cannot rotate relative to the main shaft 41 and a clutch outer 48 that can rotate relative to the main shaft 41.

  By the way, one end of the crankshaft 22 protrudes from the support walls 28a and 29a on the right side of the crankcase 23 in a state of facing forward in the traveling direction of the motorcycle, and the crankshaft 22 is formed outside the support walls 28a and 29a. A primary drive gear 49 having a relatively large diameter is fixed to one end of the shaft, and a primary driven gear 50 meshing with the primary drive gear 49 is connected to a clutch outer 48 of the clutch 44 via a damper spring 51.

A first right cover 193 that covers a part of the right side of the crankcase 23 is coupled to the crankcase 23, and a second right cover 194 is coupled to the first right cover 193 and the crankcase 23, so that the primary A reduction gear chamber 196 that houses the drive gear 49, the primary driven gear 50, and the damper spring 51 and communicates with the transmission chamber 37 is provided between the first and second right side covers 193, 194 and the crankcase 23. It is formed. The clutch 44 is provided from the second right cover 194 was or the outer end of the main shaft 41 projecting to the outside, the third right cover 195 for covering the lower portion of the clutch 44 from the outer side is coupled to the second right-side cover 194 Is done.

  The other end of the crankshaft 22 protrudes from the left support walls 28b and 29b of the crankcase 23 in a state of facing forward in the traveling direction of the motorcycle. The outer rotor 53 of the machine 52 is fixed. An inner stator 54 that constitutes the generator 52 together with the outer rotor 53 is fixed to a generator cover 55 that is coupled to the left side wall of the crankcase 23 so as to cover the generator 52.

  Referring to FIGS. 7 and 8 together, a pump unit 56 located above the oil sump chamber 38 is attached to the partition wall 39 of the crankcase 23 from below, and this pump unit 56 is , A pair of scavenge pumps 57, 58 and a feed pump 59 sandwiched between both scavenge pumps 57, 58. Both scavenge pumps 57, 58 and feed pump 59 are arranged in the direction in which the pumps 57, 58, 59 are arranged. Having a common single pump shaft 60 extending in the middle.

In the pump case 61 of the pump unit 56, a first body 62, a second body 63, a plate 64, a third body 65, and a fourth body 66 are fastened by a plurality of bolts 67, 68, 69, for example. The pump driven gear 70 is fixed to one end portion of the pump shaft 60 which is rotatably attached to the partition wall 39 from below and rotatably passes through the pump case 61. On the other hand, as shown in Figure 2, the primary driven gear 5 0 and the pump drive gear 71 that rotates is supported on the main shaft 41 at the outside of the crankcase 23 together with the pump drive gear 71 driven gear for the pump 70. Therefore, both the scavenge pumps 57 and 58 and the feed pump 59 are driven by power transmission from the crankshaft 22.

The scavenge pumps 57, 58 and the feed pump 59 are of the trochoid type. Thus, the scavenge pump 57 includes an inner rotor 73 fixed to the pump shaft 60 and an outer rotor meshing with the inner rotor 73 in a pump chamber 72 formed between the first and second bodies 6 2 and 6 3. 74, the scavenge pump 58 is disposed in a pump chamber 75 formed between the third and fourth bodies 65 and 66, an inner rotor 76 fixed to the pump shaft 60, and the inner rotor 76. The feed pump 59 is accommodated in a pump chamber 78 formed between the plate 64 and the third body 65, an inner rotor 79 fixed to the pump shaft 60, and the inner rotor 79. A meshing outer rotor 80 is housed.

  Referring to FIG. 6, the partition wall 39 of the crankcase 23 has oil collecting holes 81 and 82 for collecting oil dropped in the lower part of the pair of crank chambers 36 and 36 for each crank chamber 36 and 36. Both scavenge pumps 57 and 58 of the pump unit 56 suck oil that has dropped into the lower part of the crank chambers 36 and 36 through the oil collecting holes 81 and 82 and return it to the oil reservoir chamber 38. The first and fourth bodies 62 and 66 of the pump case 61 in the pump unit 56 have suction passages 83 and 84 that allow one end to pass through the oil collecting holes 81 and 82 and the other end to lead to the pump chambers 72 and 75. Discharge holes 85 and 86 for discharging oil from the pump chambers 72 and 75 to the outside are provided.

  The suction passages 83 and 84 are provided integrally with the first and fourth bodies 62 and 66 of the pump case 61 in a plane perpendicular to the axis of the pump shaft 60 and extend laterally. The suction passages 83 and 84 are formed so as to extend laterally from the pump case 61.

  The discharge holes 85 and 86 are located above the oil level L (see FIG. 1) of the oil stored in the oil reservoir chamber 38 in the outer wall of the pump case 61 of the pump unit 56 including the scavenge pumps 57 and 58. It is provided so that the oil from the scavenge pumps 57 and 58 is ejected toward the oil reservoir chamber 38 on the part facing the side different from the oil level L. Preferably, the discharge holes 85 and 86 are provided, The portion of the outer wall of the pump case 61 that faces outward in the axial direction of the pump shaft 60, in this embodiment, the outer wall of the first and fourth bodies 62, 66 in the axial direction of the pump shaft 60. A pump unit 56 is provided at a portion facing outward, and includes a feed pump 59 and a pair of scavenge pumps 57 and 58 sandwiching the feed pump 59 from both sides. Since those composed are aligned in the axial direction, the discharge holes 85 and 86 are respectively provided on the outer wall opposite to the feed pump 59 of the outer wall of the first and fourth body 62, 66.

  By the way, the discharge holes 85 and 86 are arranged at positions shifted in the circumferential direction from the suction passages 83 and 84 on a projection view on a plane orthogonal to the axis of the pump shaft 60, and the discharge holes 85 and 86. However, while the scavenge pumps 57 and 58, that is, the pump unit 56 are attached to the partition wall 39 of the crankcase 23, the suction passages 83 and 84 are disposed above the axis of the pump shaft 60. The suction passages 83 and 84 are disposed below the axis of the shaft 60 and below the horizontal line HL passing through the axis of the pump shaft 60. Further, the discharge holes 85, 86 are arranged above the pump shaft 60 so as to be on a vertical line VL passing through the axis of the pump shaft 60 on the projection onto the plane orthogonal to the axis of the pump shaft 60. The

Further, the scavenge pumps 57, 58, that is, the pump case 61 of the pump unit 56 are arranged at positions where the horizontal line HL passing through the axis of the pump shaft 60 crosses when the scavenge pumps 57, 58, that is, the pump unit 56 are attached to the partition wall 39. In this embodiment, in one scavenge pump 57, the discharge hole 85 is disposed above the pump shaft 60 in the first body 62. provided, the relief valve 87 as a horizontal line HL is disposed at a position crossing is disposed in the first body 62, discharge holes 8 6 is arranged above the pump shaft 60 in the other scavenge pump 58 In this way, the relief valve 8 is provided in the fourth body 66 so as to be disposed at a position where the horizontal line HL crosses. 8 is disposed on the fourth body 66.

  By the way, the first body 62 in the pump case 61 is integrally provided with a cylindrical bearing portion 62b protruding outward along the axis of the pump shaft 60, and the pump shaft penetrating the bearing portion 62b. A pair of bushes 89 and 89 are interposed between the pump 60 and the bearing portion 62 b, a bush 90 is interposed between the pump shaft 60 and the third body 65, and a bush 91 is interposed between the pump shaft 60 and the fourth body 66. Intervened.

  The oil is supplied from the discharge side of the scavenge pump 57 between a pair of bushes 89, 89 interposed between the bearing portion 62b and the pump shaft 60. As shown in FIG. 9, the scavenge pump An oil supply path 93 that guides oil from the discharge side of 57 to the bearing portion 62 b is provided in the first body 62 of the pump case 61.

That is, the first body 62 is provided with a discharge passage 92 that connects the pump chamber 72 of the scavenge pump 57 and the discharge hole 85, and the other end of the oil supply passage 93 that passes through one end of the discharge passage 92 is the two bushes. An opening is formed between 89 and 89 in the inner peripheral surface of the bearing portion 62b. The oil supply passage 93 Thus, the discharge passage 92 so as to traverse obliquely the outer end of the first body 62 to the perforated processed Thong holes are those made closed by a plug 94, the discharge hole 85 As is clearly shown in FIG. 8, they are arranged so as to be adjacent to the oil supply passage 93 in the circumferential direction when viewed from the axial direction of the pump shaft 60.

  Referring also to FIG. 10, the third body 65 in the pump case 61 is integrally provided with a passage forming portion 65 a extending vertically, and the passage forming portion 65 a has a pump of the feed pump 59. The chamber 78 is provided with a suction passage 97 for sucking oil, and the lower end of the suction passage 97 is opened downward. Thus, the feed pump 59 sucks oil in the oil sump chamber 38 via an oil strainer 98 disposed in the oil pan 27, and the oil strainer 98 is connected to the suction passage 97.

  The casing 99 of the oil strainer 98 includes a suction pipe portion 99a that forms a suction passage 100 and extends up and down, and a filter that extends to the side of the suction pipe portion 99a and extends to the upper end of the suction pipe portion 99a. A holding portion 99b and a connecting pipe portion 99c extending upward from the filter holding portion 99b are provided, and an upper end portion of the connecting pipe portion 99c communicates with the suction passage 97 and a lower end portion of the passage forming portion 65a. To be liquid-tightly fitted.

  Referring to FIG. 11 as well, the filter holding portion 99b is formed to have a cross-sectional shape such that at least a part of the filter holding portion 99b has an arc shape. For example, a mesh member 101 is provided in the filter holding portion 99b. A filter 103 held by a holding frame 102 is accommodated and held.

  The filter holding portion 99b is formed to have a rectangular or oval cross-sectional shape that is long in one direction (the left-right direction of the vehicle when the engine main body 21 is mounted on the vehicle) corresponding to the shape of the filter 103. In this embodiment, since the filter 103 has an oval shape, the filter holding portion 99b has an elliptical cross-sectional shape with an arc portion 104 on one end side along the one direction. Is formed.

The oil strainer 98 is disposed in the oil pan 27 so as to be supported by the oil pan 27, and the inner surface of the side wall of the oil pan 27 is contacted with the filter holding portion 99 b of the oil strainer 98 from below. A support arm 105 is provided in contact with and surrounding at least a part of the upper portion of the suction pipe portion 99a.

  By the way, the oil pan 27 has a cylindrical section 27a having a rectangular cross section extending up and down with its lower end closed, and an auxiliary machine such as an engine exhaust pipe disposed at one side, for example, rearward of the cylindrical section 27a. The concave portion 109 is formed in cooperation with the cylindrical portion 27a, and is integrally formed with an overhang portion 27b that projects from the upper portion of the cylindrical portion 27a to the one side (for example, rearward). The support arm 105 is fixed to the inner surface of the side wall of the cylindrical portion 27a.

  Referring to FIGS. 12 and 13 together, the support arm 105 is formed so as to surround the upper portion of the suction pipe portion 99a in the oil strainer 98 from at least three sides. In this embodiment, The support arm 105 integrally includes at least three arm portions 105a, 105b, and 105c for covering the upper portion of the suction pipe portion 99a from at least three sides, and at least two of the arm portions 105a to 105c. 105a and 105b are integrally fixed to the inner surface of the side wall of the cylindrical portion 27a in the oil pan 27 along the longitudinal direction thereof, for example.

  In addition, in this embodiment, a part of the side wall of the cylindrical portion 27a has inclined surfaces 106 and 107 which are inclined so as to approach the oil strainer 98 as the left and right side walls of the cylindrical portion 27a are directed downward. The support arm 105 is integrally fixed to one of the inclined surfaces 106 so as to form an acute angle α with the lower side of the support arm 105 of one of the inclined surfaces 106 and 107. The

  Moreover, one of the three support arm portions 105a to 105c included in the support arm 105 is formed so as to have a curved portion 105d that is curved along the arc shape of the filter holding portion 99b on the distal end side, and its entire length in the longitudinal direction. In the inner surface of the side wall of the cylindrical portion 27a, for example, it is integrally fixed to the inclined surface 106.

  Further, the filter holding portion 99b is formed to have a rectangular or oval cross-sectional shape that is long in one direction, whereas the arm portion 105b of the support arm 105 is a cylindrical portion along the one direction. 27a is fixed to the inner surface of the side wall. Further, a rib 108 is provided between the lower surface of the arm portion 105 c of the support arm 105 and the side wall inner surface of the cylindrical portion 27 a.

The lower end of the suction pipe portion 99 a provided in the oil strainer 98 is provided with a suction port 110 that opens toward the bottom of the oil pan 27 and communicates with the suction passage 100. A rod-shaped magnetic body 111 for adsorbing and capturing metal pieces and iron-based foreign matters contained therein is disposed. The magnetic body 111 is disposed at the bottom of the oil pan 27 so that at least a part thereof is inserted into the suction port 110, and a range A of the suction port 110 that overlaps the magnetic body 111 in a side view is: The diameter of the oil pan 27 is increased so as to increase in diameter toward the bottom of the oil pan 27.

  The magnetic body 111 is composed of a rod-shaped magnet 112 and a rod-shaped iron-based metal member 113 that is in close contact with the magnet 112 and coaxially connected thereto. The magnet 112 is connected to the iron-based metal member 113 and the oil. The iron-based metal member 113 is fixed to the oil pan 27 so as to be sandwiched between the bottoms of the pan 27.

  By the way, a holding cylinder portion 114 that fits and holds the magnet 112 is integrally provided on the bottom portion of the oil pan 27 so as to protrude upward, and the iron 112 that sandwiches the magnet 112 between the oil pan 27 and the iron pan 27. The system metal member 113 is fitted to the opening end side of the holding cylinder portion 114. In addition, the iron-based metal member 113 is fixed to the holding cylinder portion 114 so as not to be detached. In this embodiment, the iron-based metal member 113 is formed in an annular locking groove 115 provided on the inner periphery of the holding cylinder portion 114. By engaging the clip 116 mounted on the outer periphery of the member 113, the iron-based metal member 113 is fixed to the holding cylinder portion 114 with a part protruding from the tip of the holding cylinder portion 114.

  14 and 15, the oil level L of the oil stored in the oil sump chamber 38 is arranged, for example, in the right front of the oil pan 27 when the engine body 21 is mounted on the vehicle. 27 and an oil level finder 120 attached to the crankcase 23 can be inspected from the outside.

  The oil level finder 120 has a lower communication path 121 and an upper communication path 122 that communicate with the oil reservoir chamber 38, and the lower communication path 121 is an oil reservoir below the oil level L in the oil reservoir chamber 38. The upper communication passage 122 is formed so as to extend in the vertical direction so as to communicate with the oil reservoir chamber 38 above the oil level L. The

  A lower connection hole 123 that communicates with the oil reservoir chamber 38 below the oil level L of the oil stored in the oil reservoir chamber 38 is provided in the upper portion of the oil pan 27 with a horizontal axis. The lower communication path 121 communicates coaxially with the lower connection hole 123. On the other hand, an upper connection hole 124 that allows the upper communication path 122 to communicate with the portion of the second case half 29 of the crankcase 23 that projects to the right front of the oil pan 27 communicates with the speed reducer chamber 196. Provided. Thus, the speed reducer chamber 196 communicates with the upper portion of the oil sump chamber 38 via the transmission chamber 37, and the upper connection hole 124 connects the oil in the oil sump chamber 38 via the speed reducer chamber 196 and the transmission chamber 37. It communicates above the surface L.

  The oil level finder 120 is fixed to the tubular member 126 so as to close a tubular member 126 forming a communication chamber 125 for introducing the oil in the oil pan 27 and a window 128 provided in the tubular member 126. A lower connecting pipe 126a formed integrally with the lower part of the tubular member 126 by forming a lower communication path 121 that communicates with the lower part of the communication chamber 125. In order to allow the passage 121 to communicate with the lower connection hole 123 coaxially, the lower connection hole 123 is liquid-tightly fitted, and an upper communication passage 122 leading to the upper portion of the communication chamber 125 is formed to be integrally provided on the upper portion of the tubular member 126. The upper connection pipe 126b is fitted into the upper connection hole 124 in a liquid-tight manner so as to allow the upper communication path 122 to communicate with the upper connection hole 124 coaxially.

  Thus, the oil can be returned from the speed reducer chamber 196 to the oil reservoir chamber 38 through the communication chamber 125 of the tubular member 126, and the upper communication path 122 of the oil level finder 120 is communicated with the speed reducer chamber 196. Will be.

  The oil level finder 120 is disposed so as to straddle the coupling surface of the crankcase 23 and the oil pan 27, and the lower connecting pipe 126a of the tubular member 126 is fitted to the oil pan 27 so as to be tubular. The oil level finder 120 is directly attached to the oil pan 27 and the crankcase 23 by fitting the upper connecting pipe 126b of the member 126 to the second case half 29 in the crankcase 23.

  By the way, the outer peripheral portion of the glass plate 127 which is a rectangular flat plate is sandwiched between a tubular member 126 and a pressing member 129 which is detachably attached to the tubular member 126 by, for example, four screw members 130, 130. The outer peripheral portion of the glass plate 127 and the tubular member 126 and the pressing member 129 are connected in an endless manner so that the outer peripheral portion of the glass plate 127 is fitted, for example, and the fitting concave portion 133 is formed inside. Each is sealed with a sealing member 132 provided on the periphery.

  The tubular member 126 is provided with the window 128 and a housing recess 134 for housing the glass plate 127 having a flat plate shape. The outer periphery of the glass plate 127 is disposed between the pressing member 129 having a flat plate shape. A stepped portion 135 is formed between the receiving recess 134 and the window 128. Moreover, the pressing member 129 is provided with a scale 136 representing the oil level height with a specified oil amount.

  Referring again to FIG. 7, a water pump drive gear 137 is fixed to the other end of the pump shaft 60 in the pump unit 56, and rotational power is transmitted from the pump shaft 60 to a water pump (not shown). .

  A discharge passage 138 for guiding oil discharged from the pump chamber 78 of the feed pump 59 in the pump unit 56 is provided in a passage forming portion 65a integrally formed with the third body 65 in the pump case 61, as shown in FIG. In addition, a relief valve 139 interposed between the discharge passage 138 and the suction passage 97 is disposed in the passage forming portion 65a.

  The discharge passage 138 of the feed pump 59 is connected to the right side wall of the crankcase 23 via an air-cooled oil cooler (not shown) and an oil filter (not shown) provided in the second case half 29 of the crankcase 23. Connected to an oil passage 141 (see FIG. 2) provided on the first right cover 193 attached to the left side cover 193 and to an oil passage (not shown) provided on a generator cover 55 attached to the left side wall of the crankcase 23. The oil passage 141 of the first right cover 193 and the oil passage of the generator cover 55 are provided in the first case half 28 of the crankcase 23 between the first and second cylinder blocks 24A and 24B. Connected to both ends of the main gallery 142.

  In FIG. 16, the support walls 28a, 28b, 28c of the first case half 28 in the crankcase 23 include outer journal portions 22c, 22d and an intermediate journal portion 22e of the crankshaft 22, and the support walls 28a-28c. In between, oil passages 143, 144, 145 for supplying oil from the main gallery 142 are provided so as to open to the inner periphery of the shaft holes 33-35.

  In FIG. 17, the upper front wall of the second case half 29 in the crankcase 23 is cranked to cool the pistons 31A and 31A that are slidably fitted into the cylinder bores 30A and 30A of the first cylinder block 24A. A pair of first oil jets 146A, 146A arranged for each of the chambers 36, 36 is attached to cool the pistons 31B, 31B slidably fitted into the cylinder bores 30B, 30B of the second cylinder block 24B. A first case half of the crankcase 23 such that a pair of second oil jets 147A, 147A disposed in each of the crank chambers 36, 36 are located rearward of the opening end of the cylinder bore 30B ... to the crankcase 23. 28, each piston 31A of each cylinder block 24A, 24B ... 31B A pair of third oil jets 148A, 148A disposed in each crank chamber 36, 36 for cooling the cylinder are attached to the first case half 28 of the crankcase 23 between the first and second cylinder blocks 24A, 24B. It is done.

As shown in FIGS. 6 and 17, a first oil supply oil passage 150 extending in parallel with the crankshaft 22 is provided in the upper part of the front wall of the second case half 29 in the crankcase 23. In the oil supply oil passage 150, a connection oil passage 149 (see FIG. 5) provided in the left wall of the first case half body 28 through the main gallery 142 is connected to the first and second case half bodies 28 and 29. Communicate when combined.

  Referring to FIGS. 18 and 19 together, the first oil jet 146A is connected to the oil jet main body 151 attached to the second case half body 29 with a pair of first oil passages communicating with the first oil supply oil passage 150. A pair of second oil passages 153 and 153 communicating with the first oil passages 152 and 152, respectively, and a pair of second oil passages 153 and the like are ejected toward the piston 31A. Four jet holes 154, 154; 155, 155 are provided.

The oil jet body 151 includes a base portion 151a mounted on the second case half 29, the both the that out extending towards the piston 31A side from the base portion 151a jet holes 154 ..., that are 155 ... are provided The extending portion 151b is integrally formed, and is fastened to the second case half 29 so as to be detachable by a bolt 156 that is a fastening member. Thus, the base 151 a of the oil jet main body 151 is provided with an insertion hole 157 through which the bolt 156 is inserted.

  The first oil passages 152 are provided in the base portion 151a so as to communicate with the first oil supply oil passage 150 when the oil jet main body 151 is fastened to the second case half body 29. The passages 153... Are provided in the extending portions 15 b so as to individually communicate with the first oil passages 152.

  The second oil passages 153... Are formed by closing the open ends of the bottomed processing holes formed by drilling the extending portion 151b from the side opposite to the tip side thereof with plugs 158. The first oil passages 152 communicating with the oil passages 153 are provided in the base portion 151a so as to extend in a direction intersecting with the second oil passages 153.

  The jet holes 154... 155 leading to the second oil passages 153 are provided at a plurality of locations including the tip of the extension portion 151b. In this embodiment, the jet holes 154. Holes 154... Are provided, and jet holes 155... Are provided in a portion slightly closer to the base 151 a side from the tip of the extension portion 151 b.

As shown in FIGS. 5 and 17, a second oil supply oil passage 160 extending in parallel with the crankshaft 22 is provided in a portion of the first case half 28 in the crankcase 23 that constitutes a part of the partition wall 39. The second oil supply oil passage 160 communicates with the connection oil passage 159 provided on the left wall of the first case half 28 through the main gallery 142.

Referring also to FIG. 20, the second oil jet 147A has the oil jet body 161 which is bolted 165 to the first case half 2 8, a pair of oil passages leading to the second oil supply passage 160 162 , 162 and four jet holes 163, 163; 164, 164 communicating with each of the oil passages 162 so as to eject oil toward the piston 31B, and the oil jet main body 161 includes The insertion hole 166 for inserting the bolt 165 is provided.

  Referring also to FIG. 21, the third oil jet 148A includes an oil jet main body 167 formed to extend in the axial direction of the crankshaft 22 and a pair of oil passages 168. Of the oil jet main body 167 and the oil passage 169 extending in the longitudinal direction of the oil jet main body 167 and the jet leading to the oil passage 169 so as to eject the oil toward the piston 31A on the first cylinder block 24A side. A hole 170 and a jet hole 171 leading to the oil passage 169 so as to eject oil toward the piston 31B on the second cylinder block 24B side are provided, and the oil jet main body 167 includes a pair of bolts 172, 172 At 172, the first case half 28 is fastened.

  The third oil jets 148A and 148A are capable of ejecting oil from the opposite side of the first oil jets 146A to the pistons 31A of the first cylinder block 24A, and face the first oil jets 146A. It attaches to the upper part of the 1st case half body 28 so that it may be arrange | positioned in another position.

Referring also to FIG. 22, an oil passage 173 extending in parallel with the crankshaft 22 is provided in the upper portion of the second case half 29 at a portion facing the upper portion of the transmission chamber 37. A connecting oil passage 159 provided in the left wall of the first case half 28 through the main gallery 142 communicates with the main gallery 142 when the first and second case halves 28 and 29 are joined.

  In addition, the second case is configured such that the jet holes 174, 174,... Arranged at a plurality of positions spaced in the longitudinal direction of the oil passage 173 eject oil toward the gear transmission 40 in the transmission chamber 37. Provided on half body 29.

  3 and 4 again, the crankshaft 22 has a pair of crankpins 22a and 22b provided on the crankshaft 22, and connecting rods 32A and 32B connected in pairs to the crankpins 22a and 22b; In order to perform lubrication between 32A and 32B, oil is supplied only from one end side of the crankshaft 22, an oil supply port 181 that opens at one axial end of the crankshaft 22, and a pair of the cranks A pair of crankpin oil supply passages 182 and 183 which are respectively disposed at portions corresponding to the pins 22a and 22b and communicate with each other, and of the crankpin oil supply passages 182 and 183, along the axial direction of the crankshaft 22. Crankpin oil supply passage 182 closest to the oil supply port 181 and the oil supply The crankshaft 22 is provided with a communication passage 184 that connects the two sides 181, and one end of the oil supply port 181 is liquid-tightly connected to the first right cover 193 so as to communicate with the oil passage 141 in the first right cover 193. The other end portion of the connecting pipe 186 (see FIG. 2) connected to is fitted and connected.

  The oil filler port 181 is coaxially provided at one end portion of the crankshaft 22 including the outer journal portion 22c. The crankpin oil supply passages 182 and 183 are inclined so as to intersect with the axis of each of the crankpins 22a and 22b, but directly intersect and communicate with each other at the axial center of the intermediate journal portion 22e. Is provided. Thus, the crank pin oil supply passages 182 and 183 are cranked in a direction obliquely intersecting the axis of each of the crank pins 22a and 22b so that one end of the crank pin oil supply passages 182 and 183 intersect each other at the center in the axial direction of the intermediate journal portion 22e. The other end opening of the machining hole drilled in the shaft 22 is closed by plugs 187 and 188, and both crankpin oil supply passages 182 and 183 are formed to have the same diameter.

  The communication passage 184 has a plug 189 at the other end opening of a machining hole drilled in the crank pin 22a so that one end of the communication passage 184 is connected to the oil supply port 181 and intersects the crank pin oil supply passage 182. The both crankpin oil supply passages 182 and 183 are formed to have a larger diameter than the communication oil passage 184.

Further, the crankshaft 22 has a hollow passage 185 having the same diameter as that of the communication passage 184 with respect to the communication passage 184 with respect to a plane perpendicular to the axis of the intermediate journal portion 22 e at the axial center of the intermediate journal portion 22 e. The hollow passage 185 is formed of a machining hole which is drilled in the crank pin 22b so as to intersect the crank pin oil supply passage 183 while closing one end thereof. The other end opening is closed by a plug 190.

  The crank pin 22a is provided with lateral oil passages 191, 191; 192, 192 having an inner end opened to the crank pin oil supply passage 182 and an outer end opened to the outer periphery of the crank pin 22a. 191 ..., 192 ... are arranged on both sides of the crankpin oil supply passage 182 in pairs for each of the pair of connecting rods 32A, 32B connected to the crankpin 22a.

  Similarly to the above-described crank pin 22a, the crank pin 22b also has a lateral oil passage 191; 191; 192, which opens the inner end of the crank pin oil supply passage 183 and opens the outer end to the outer periphery of the crank pin 22b. 192 are provided, and these lateral oil passages 191... 192... Are arranged on both sides of the crankpin oil supply passage 183 in pairs for each of the pair of connecting rods 32A, 32B connected to the crankpin 22b.

  In FIG. 23, in order to supply oil between the crank pin 22b and the connecting rod 32B connected to the crank pin 22b, an inner end is opened in the crank pin oil supply passage 183 and an outer end is connected to the crank pin 22b. The horizontal oil passages 192 and 192 that open to the outer periphery are two imaginary straight lines that extend parallel to each other through the inner periphery of the crankpin oil supply passage 183 on a projection view on a plane orthogonal to the rotation axis of the crankshaft 22. Arranged between LB1 and LB2.

  In FIG. 24, in order to supply oil between the crank pin 22b and the connecting rod 32A connected to the crank pin 22b, an inner end is opened in the crank pin oil supply passage 183 and an outer end is connected to the crank pin 22b. The horizontal oil passages 191 and 191 that open to the outer periphery are two imaginary straight lines that extend parallel to each other through the inner periphery of the crank pin oil supply passage 183 on a projection view on a plane orthogonal to the rotation axis of the crankshaft 22. Arranged between LA1 and LA2.

  That is, the connecting rod is connected between two imaginary straight lines LA1, LA2; LB1, LB2 extending parallel to each other through the inner periphery of the crankpin oil supply passage 183 on the projection onto the plane orthogonal to the rotation axis of the crankshaft 22. The lateral oil passages 191, 191; 192, 192 that make a pair for each of 32A, 32B are arranged.

  Also on the crankpin 22a side, like the crankpin 22b side, they extend in parallel to each other through the inner periphery of the crankpin oil supply passage 182 on a projection view on a plane orthogonal to the rotation axis of the crankshaft 22. Between the two imaginary straight lines LA1, LA2; LB1, LB2, the transverse oil passages 191, 191; 192, 192 that make a pair for each of the connecting rods 32A, 32B are arranged.

  Moreover, the lateral oil passages 191, 191; 192, 192 are arranged such that center axes C1, C2 are arranged on a plane orthogonal to the rotation axis of the crankshaft 22, and the center axes C1, C2 are connected to the crank pin oil supply passage 182. , 183 are provided on the crank pins 22a, 22b so as to cross the axis.

  By the way, a pair of connecting rods 32A, 32B; 32A, 32B are connected to a pair of crank pins 22a, 22b included in the crankshaft 22, and each of the connecting rods 32A, 32B; 32A, 32B forms a pair. In the center of the two planes PL1, PL2 including the central axes C1,..., C2... Of the two sets of the lateral oil passages 191, 191; Crank pin oil supply passages 182 and 183 are formed so that the central axes of the crank pin oil supply passages 182 and 183 pass through intersections between the orthogonal plane PL3 and the axes of the crank pins 22a and 22b. 191, 191; 192, 192 to the outer periphery of the crank pins 22a, 22b Mouth end, both sides by the crank pin 22a of the crank pin oil supply passage 182, 183 are arranged in parallel to the axis of two straight lines SL ... position through which the 22b.

  Next, the operation of this embodiment will be described. Inside the engine main body 21, a pair of crank chambers 36 and an oil reservoir chamber 38 disposed below the crank chambers 36 are formed. Scavenge pumps 57 and 58 for collecting oil from the lower part of the crank chamber 36 to the oil reservoir chamber 38 are attached to the second case half 29 constituting a part of the engine main body 21. Scavenge pumps 57, 58 are arranged in the upper part of 38 so as to be positioned above the oil level L of the oil accumulated in the oil reservoir chamber 38, and of the outer walls of the pump case 61 of the scavenge pumps 57, 58 A discharge hole 85 for discharging oil from the scavenge pumps 57 and 58 toward the oil reservoir chamber 38 at a portion facing the side different from the oil level L of the oil. 86 is provided.

  Therefore, the oil collected from the scavenge pumps 57 and 58 does not directly join the oil accumulated in the oil reservoir chamber 38 while improving the oil recovery efficiency by directly returning the oil collected from the crank chamber 36 to the oil reservoir chamber 38. In this way, the occurrence of foaming can be suppressed, and deterioration of the oil can be suppressed.

  In addition, the pump shaft 60 is rotatably supported by the pump case 61, and the discharge holes 85 and 86 are provided in a portion of the outer wall of the pump case 61 facing outward in the axial direction of the pump shaft 60. The oil discharged from the cylinders 85 and 86 is applied to the wall of the engine body 21 around the scavenge pumps 57 and 58 to attenuate the momentum of the discharged oil, and the discharged oil is collected in the oil reservoir chamber 38. Occurrence of foaming can be further suppressed by gently joining the oil.

  Further, suction passages 83 and 84 for guiding oil from the crank chamber 36 to the pump chambers 72 and 75 in the pump case 61 are provided in the pump case 61 so as to extend laterally from the pump case 61, and the discharge holes 85 and 86. However, since the suction passages 83 and 84 are arranged at positions shifted in the circumferential direction on the projection onto the plane orthogonal to the axis of the pump shaft 60, the discharge hole is arranged using the empty portion of the pump case 61. can do.

  Further, the discharge holes 85 and 86 are disposed above the axis of the pump shaft 60 when the scavenge pumps 57 and 58 are attached to the second case half 29 of the engine body 21, and the suction passages 83 and 84 are disposed in the pump shaft 60. Since the discharge holes 85 and 86 are disposed as much as possible above the oil level L of the oil in the oil reservoir chamber 38, the oil discharged from the discharge holes 85 and 86 is stored in the oil reservoir. The momentum of the discharged oil can be sufficiently attenuated until it merges with the oil accumulated in the chamber 38.

  On the projection onto the plane orthogonal to the axis of the pump shaft 60 when the scavenge pumps 57, 58 are attached to the second case half 29, on the vertical line VL passing through the axis of the pump shaft 60 Since the discharge holes 85 and 86 are arranged above the pump shaft 60 so as to exist, the oil discharged from the discharge holes 85 and 86 is scattered on the rotating pump shaft 60, and the pump shaft 60 and the pump case 61 are scattered. Can be used for lubrication between.

  A feed pump 59 and a pair of scavenge pumps 57 and 58 sandwiching the feed pump 59 from both sides are arranged side by side in the axial direction of the pump shaft 60, and the feed pump of the pump cases 61 of both the scavenge pumps 57 and 58 is arranged. Since the discharge holes 85 and 86 are provided in the outer wall on the opposite side to 59, the oil discharged from both scavenge pumps 57 and 58 can be prevented from affecting each other.

  In addition, the horizontal line HL passing through the axis of the pump shaft 60 crosses the projection on the plane orthogonal to the axis of the pump shaft 60 in a state where the scavenge pumps 57 and 58 are attached to the second case half 29, Since the relief valves 87 and 88 are disposed in the pump case 61 of the scavenge pumps 57 and 58, the discharge holes 85 and 86 are located above the axis of the pump shaft 60, whereas the relief valves 87 and 88 are present. However, it will be arrange | positioned in the position which the horizontal line HL which passes along the axis line of the pump shaft 60 crosses on the projection view to the plane orthogonal to the axis line of the pump shaft 60, and the arrangement space of the relief valves 87 and 88 is effectively secured. However, it is possible to prevent the relief valves 87 and 88 from being affected by fluctuations in the discharge pressure of the oil discharged from the discharge holes 85 and 86 as much as possible.

  Further, a bearing portion 62b that supports the pump shaft 60 is provided in the pump case 61, an oil supply passage 93 that guides oil from the discharge side of the scavenge pump 57 to the bearing portion 62b is provided in the pump case 61, and the axis of the pump shaft 60 Since the discharge hole 85 of the scavenge pump 57 is disposed so as to be adjacent to the oil supply passage 93 in the circumferential direction when viewed from the direction, oil from the discharge side of the scavenge pump 57 is positively supplied to the bearing portion 62b, and the pump Lubricity between the shaft 60 and the bearing portion 62b can be improved.

  An oil strainer 98 connected to a feed pump 59 is disposed in an oil pan 27 that forms an oil sump chamber 38 between the crankcase 23 and a casing 99 of the oil strainer 98 serves as a suction passage. A suction pipe part 99a which forms 100 and extends vertically and has a lower end opened in the oil pan 27, and a filter holding which is connected to the upper end of the suction pipe part 99a so as to expand laterally from the suction pipe part 99a. A support arm 105 is provided on the inner surface of the side wall of the oil pan 27 so as to contact the filter holding portion 99b from below and surround at least a part of the upper portion of the suction pipe portion 99a.

  Therefore, it is possible to secure the support rigidity of the oil strainer 98 by the oil pan 27 while preventing the bottom of the oil pan 27 from disposing oil that obstructs the oil flow.

  The oil pan 27 is formed in cooperation with the cylindrical portion 27a so as to cooperate with the cylindrical portion 27a. The cylindrical portion 27a extends vertically and the concave portion 109 for arranging auxiliary equipment such as an exhaust pipe is disposed on one side of the cylindrical portion 27a. In this way, it is formed so as to integrally have an overhanging portion 27b projecting from the upper portion of the cylindrical portion 27a to the one side, and the support arm 105 is fixed to the inner surface of the side wall of the cylindrical portion 27a. The cross-sectional area of the cylindrical portion 27a is smaller than the cross-sectional area of the upper end opening of the oil pan 27, and the side wall of the cylindrical portion 27a can be made relatively close to the oil strainer 98, and the supporting arm is attached to the side wall. Since 105 is fixed, the length of the support arm 105 from the side wall can be made relatively short, and the strength of the support arm 105 can be increased while suppressing an increase in weight.

  In addition, since the support arm 105 is formed so as to surround the upper portion of the suction pipe portion 99a from at least three sides, the support rigidity of the oil strainer 98 by the support arm 105 can be increased, and the support arm 105 is provided with the suction pipe portion 99a. And at least three arm portions 105a, 105b, 105c for covering at least three sides thereof, and at least two of the arm portions 105a-105c are arranged along the longitudinal direction thereof. Since it is fixed to the inner surface of the side wall of the cylindrical portion 27a, the support strength of the support arm 105 to the oil pan 27 can be increased, and the support rigidity of the support arm 105 of the oil strainer 98 can be further increased.

  Further, a part of the side wall of the cylindrical portion 27a is formed to have inclined surfaces 106 and 107 inclined so as to approach the oil strainer 98 toward the lower side, and the support arm 105 is formed on the inclined surface 106. , 107 is fixed to the inclined surface 106 so as to form an acute angle with the lower side of the support arm 105, so that the support strength of the support arm 105 to the oil pan 27 can be further increased.

In addition , at least a part of the filter holding portion 99b of the oil strainer 98 is formed so as to have a cross-sectional shape having an arc shape, and one of the three support arm portions 105a to 105c included in the support arm 105 is a filter. Since the curved portion 105d that is curved along the arc shape of the holding portion 99b is formed on the tip side while being fixed to the inner surface of the side wall of the tubular portion 27a over the entire length in the longitudinal direction, the curved portion 105d holds the filter. The oil pan 27 of the support arm 105 is fixed by fixing the entire length in the longitudinal direction of the arm portion 105a having the curved portion 105d at the tip end to the inner surface of the side wall of the cylindrical portion 27a while suppressing the separation of the portion 99b from the support arm 105. Support strength can be further increased.

  Incidentally, the filter holding portion 99b of the oil strainer 98 is formed to have a rectangular or oval cross-sectional shape that is long in one direction corresponding to the shape of the filter 103 accommodated in the filter holding portion 99b. Since the support arm 105 is fixed to the inner surface of the side wall of the cylindrical portion 27a along the one direction, the support arm 105 is fixed to the side wall of the cylindrical portion 27a in the oil pan 27 to increase the support arm 105. The support strength of the arm 105 to the oil pan 27 can be increased.

  Moreover, since the rib 108 is provided between the lower surface of the support arm 105 and the inner surface of the side wall of the cylindrical portion 27a, the support strength of the support arm 105 to the oil pan 27 can be further increased.

In the oil pan 27, there is disposed a magnetic body 111 for adsorbing and capturing metal pieces and iron-based foreign matters mixed in the oil. The magnetic body 111 has a rod shape and is an oil strainer. Since the oil pan 27 is disposed at the bottom so that at least a part thereof is inserted into the suction port 110 of the 98, the magnetic body 111 is compactly disposed without restricting the shape and arrangement of the oil pan 27. The magnetic body 111 can be reduced in size and weight, and the magnetic body does not obstruct the flow of oil to the oil strainer 98. It is possible to suppress a reduction in the suction efficiency while capturing the water.

  In addition, the range A of the suction port 110 that overlaps the magnetic body 111 in a side view is enlarged so as to increase in diameter toward the bottom of the oil pan 27. A sufficient distribution area can be secured and the suction efficiency can be improved.

  Further, since the magnetic body 111 is composed of the rod-shaped magnet 112 and the rod-shaped iron-based metal member 113 that is in close contact with the magnet 112 and coaxially connected thereto, the amount of expensive magnetic metal used is suppressed and the cost is reduced. Can be achieved. Moreover, since the iron metal member 113 is fixed to the oil pan 27 with the magnet 112 sandwiched between the iron metal member 113 and the bottom of the oil pan 27, the magnet 112 is held on the oil pan 27 without providing a special holding mechanism. can do.

  In order to hold the magnetic body 111, a holding cylinder portion 114 that fits and holds the magnet 112 is provided at the bottom of the oil pan 27 so as to protrude upward. Since the sandwiched iron-based metal member 113 is fitted to the opening end side of the holding cylinder portion 114, the magnet 112 can be reliably held so that the flowing oil does not directly hit the magnet 112.

  In addition, since the iron-based metal member 113 is fixed to the holding cylinder portion 114 so as not to be detached, it is possible to reliably prevent the magnet 112 from being detached from the holding cylinder portion 114 and is provided on the inner periphery of the holding cylinder portion 114. Since the clip 116 attached to the outer periphery of the ferrous metal member 113 is engaged with the annular locking groove 115, the ferrous metal member 113 is fixed to the holding cylinder portion 114, so that the clip 116 can be simply used. The iron-based metal member 113 can be fixed to the holding cylinder portion 114 with a simple structure, and an increase in cost can be suppressed.

  Furthermore, since the iron-based metal member 113 is fixed to the holding cylinder portion 114 with a part thereof protruding from the tip of the holding cylinder portion 114, the length of the magnetic body 111 is increased, and metal fragments and iron-based foreign matters are removed. The range that can be captured can be expanded.

  By the way, the oil level L of the oil stored in the oil storage chamber 38 is detected from the outside by an oil level finder 120 having a lower communication path 121 and an upper communication path 122 communicating with the oil storage chamber 38 and attached to the engine body 21. In the oil level finder 120, the lower communication passage 121 is formed to extend in the horizontal direction so as to communicate with the oil reservoir chamber 38 below the oil level L, and the upper communication passage 122 is formed. The upper communication passage 122, which is a communication passage on the side from which air escapes even when the vehicle is inclined, is formed so as to extend in the vertical direction so as to communicate with the oil reservoir chamber 38 above the oil level L. It becomes difficult for oil to fill and block, and it is possible to improve the checkability by obtaining an accurate oil level quickly.

The oil sump chamber 38 includes a crankcase 23 and an oil pan 27 coupled to the lower end of the crankcase 23. In the portion of the crankcase 23 that protrudes to the side of the oil pan 27, Since the upper connection hole 124 for fitting the upper connection pipe 126b at the upper part of the oil level finder 120 in a liquid-tight manner from below is provided so as to communicate with the upper communication path 122 formed in the upper connection pipe 126b. Ri oil by gravity even oil has reached the communication passage 122 is liable to fall from the upper communicating passage 122 drops to normal oil level L, it is possible to obtain a fast and accurate oil level.

  Further, since the oil level finder 120 is disposed so as to straddle the coupling surface of the crankcase 23 and the oil pan 27 and is directly attached to the oil pan 27 and the crankcase 23, the oil level finder 120 is attached to the engine body 21. The oil level finder 120 can be fixed to the engine body 21 with a simple structure that does not require a dedicated member for attachment.

  The oil level finder 120 has a tubular member 126 that forms a communication chamber 125 that introduces oil in the oil pan 27 through the lower communication passage 121, and a window 128 that is provided in the tubular member 126 is closed. Since the glass plate 127 fixed to the member 126 is provided, the components of the oil level finder 120 are integrated to facilitate handling, and work such as replacement work becomes easy.

  And since the outer peripheral part of the glass plate 127 is pinched | interposed by the tubular member 126 and the pressing member 129 attached to this tubular member 126 so that attachment or detachment is possible, the glass plate 127 can be firmly fixed to the tubular member 126, Since the seal member 132 seals between the outer periphery of the glass plate 127 and the tubular member 126 and the pressing member 129, oil leakage from the outer periphery of the glass plate 127 can be reliably prevented.

  Further, when fixing the glass plate 127 to the tubular member 126, the tubular member 126 has a window 128 and an accommodation recess 134 for accommodating the flat glass plate 127, and a stepped portion 135 between the window 128 and the accommodation recess 134. A flat pressing member 129 that is provided so as to sandwich the outer peripheral portion of the glass plate 127 between the stepped portion 135 is detachably attached to the tubular member 126, and thus the glass plate 127 is attached to the tubular member 126. Can be securely held and fixed.

  In addition, since the pressing member 129 is provided with a scale 136 representing the oil level height with a prescribed oil amount, it is not only necessary to attach a special part for the scale to the oil level finder 120, but also to be detected. The oil level can be accurately determined by reducing the distance between the oil level L and the scale 136.

And from the speed reducer chamber 196 through the communication chamber 125 of the tubular member 126 as possible to return the oil to the oil sump chamber 38 side, an upper communicating passage 12 second oil level viewfinder 120 is in communication with the said speed reducer chamber 196 Therefore, the tubular member 126 can be used not only as the oil level finder 120 but also as the oil return pipe, so that the number of parts can be reduced.

The piston 31A that is slidably fitted to the cylinder bore 30A of the first cylinder block 24A is cooled by the oil ejected from the first oil jet 146A, and the first oil jet 146A is the first cylinder. The first oil supply provided in the second case half 29 is connected to the second case half 29 which is coupled to the first case half 28 coupled to the block 24A and forms the crankcase 23 together with the first case half 28. Since the feed pump 59 that is provided so as to be connected to the oil passage 150 and supplies oil to the first oil supply oil passage 150 is also attached to the second case half body 29, the feed pump 59 supplies the first oil jet 146A to the first oil jet 146A . It is possible to simplify and shorten the oil passage to the end.

  Further, the first oil jet 146A is connected to the oil jet main body 151 attached to the second case half 29, the first and second oil passages 152, 153 communicating with the first oil supply oil passage 150, and the oil passages 152 thereof. , 153 to be provided with jet holes 154, 155, so that the degree of freedom in the injection direction from the first oil jet 146A is increased as compared with the case where the oil jet is directly provided in the crankcase 23. Can do.

  Moreover, since the oil jet main body 151 is detachably attached to the second case half body 29 with the bolts 156, it is possible to replace the first oil jet 146A according to the type of the piston 31A, and improve versatility. be able to.

The oil jet body 151 of the first oil jet 146A has a base portion 151a mounted on the second case half 29, when that out extending toward the base portion 151a to the piston 31A side both the jet holes 154 ..., 155 ... are It has an extending portion 151b provided integrally therewith, and the jet holes 154, 155, ... are formed in first oil passages 152 ... provided in the base portion 151a so as to communicate with the first oil supply oil passage 150. Since the second oil passages 153... Provided in the extending portion 151b are communicated with each other, oil can be easily transferred from the second case half 29 to the jet holes 154.

  Moreover, the second oil passages 153... Are formed by closing the open ends of the bottomed processing holes formed by drilling the extending portions 151b from the side opposite to the front end side with the plugs 158. Since the first oil passages 152 communicating with the oil passages 153 are provided in the base portion 151a so as to extend in a direction intersecting with the second oil passages 153, the first and second oil passages 152,. 153... Are subjected to a clogging operation by plugs 158... On the second oil passage 153..., And then the first and second oil passages are performed without complicated processing. 152... 153 can be easily formed on the oil jet main body 151.

  In addition, since the jet holes 154... 155... Are provided at a plurality of locations including the tip of the extending portion 151b, the degree of freedom of arrangement of the jet holes 154.

  Furthermore, since the third oil jet 148A arranged at another position facing the first oil jet 146A has a jet hole 170 for injecting oil toward the piston 31A, it is provided in the first case half 28. The first and third oil jets 146A, 148A are distributed and arranged on the first and second case half bodies 28, 29 side, so that the degree of freedom of arrangement of the oil jets 146A, 148A is increased regardless of the configuration of the crankcase 23. Can be increased.

  The crankshaft 22 that is rotatably supported by the crankcase 23 has a pair of crankpins 22a and 22b. The crankshaft 22 has an oil supply port 181 that opens at one end in the axial direction, and each of the crankshafts. A pair of crankpin oil supply passages 182 and 183 which are respectively disposed at portions corresponding to the pins 22a and 22b and communicate with each other, and of the crankpin oil supply passages 182 and 183, along the axial direction of the crankshaft 22. A crankpin oil supply passage 182 that is closest to the oil supply port 181 and a communication passage 184 that connects the oil supply ports 181 are provided. The pair of crankpin oil supply passages 182 and 183 that have a larger diameter than the communication passage 184 are provided. Are mutually inclined while intersecting with the axis of each crankpin 22a, 22b. Since the crankshaft 22 is provided so as to be in direct communication with each other, a sufficient amount of lubrication is also applied to the crankpin oil supply passage 183 on the downstream side in the flow direction of oil supplied from the oil supply port 181 on one end side of the crankshaft 22. Oil can be supplied.

  In addition, since the crankpin oil supply passages 182 and 183 are formed to have the same diameter, the oil can be supplied smoothly without greatly changing the oil flow area.

  Each of the crank pins 22a, 22b has a lateral oil passage 191 ..., 192 ... that has an inner end opened to each crank pin oil supply passage 182, 183 and an outer end opened to the outer periphery of the crank pins 22a, 22b. The connecting rods 32A, 32B, which are connected to the pins 22a, 22b are provided in pairs so as to be disposed on both sides of the crankpin oil supply passages 182, 183, so that the crankpin oil supply passages 182, 183 are provided. The oil can be evenly guided to the outer peripheral side of the crank pins 22a, 22b to ensure the lubricity between the crank pins 22a, 22b and the connecting rods 32A, 32B.

  In addition, the horizontal oil passages 191... 192. Since the connecting rods 32A ..., 32B ... are arranged in pairs between the straight lines LA1, LA2; LB1, LB2, the lengths of the respective lateral oil passages 191 ..., 192 ... The oil can be supplied to the connecting rods 32A, 32B, in a well-balanced manner.

  The lateral oil passages 191... 192... Have center axes C1... C2 .. disposed on a plane perpendicular to the rotation axis of the crankshaft 22, and the center axes C1. , 183 are provided in the crank pins 22a, 22b so as to intersect with the axis of the oil 183, so that the oil can be satisfactorily supplied from the crank pin oil supply passages 182, 183 to the lateral oil passages 191.

  A pair of connecting rods 32A, 32B is connected to each of the pair of crank pins 22a, 22b provided in the crankshaft 22, and a pair is formed for each of the connecting rods 32A, 32B,. In the center between two planes PL1, PL2 including the central axes C1,..., C2 for each set of the two sets of the lateral oil passages 191, 192, arranged perpendicular to the axes of the crank pins 22a, 22b. The crankpin oil supply passages 182 and 183 are formed so that the center axis of the crankpin oil supply passages 182 and 183 passes through the intersection of the plane PL3 and the axis of the crankpins 22a and 22b, and the lateral oil passages 191. Open ends of the crank pins 22a and 22b to the outer periphery are parallel to the axes of the crank pins 22a and 22b. .., 192... Can be made substantially equal to each other, whereby each of the lateral oil passages 191... 192. .., 32B, and the crank pins 22a, 22b can be balanced.

The crankshaft 22 is disposed on both outer sides in the axial direction of the pair of crankpins 22a and 22b having coaxial axes, and is rotatably supported by the crankcase 23 of the engine body 21. that a pair of outer journal portion 22c, 22 d, have both crank pin 22a, and an intermediate journal portion 2 2 e rotatably supported on the crankcase 23 while being disposed between 22b together, pair Since the pair of crank pin oil supply passages 182 and 183 respectively corresponding to the crank pins 22a and 22b of the intermediate journal portion 22e are in direct communication with each other at the center in the axial direction of the intermediate journal portion 22e, the crank shaft 22 is centered on the intermediate journal portion 22e. Can be balanced.

  Further, a hollow passage 185 having the same diameter as that of the communication passage 184 is provided in the crankshaft 22 so as to be symmetrical to the communication passage 184 with respect to a plane perpendicular to the axis of the intermediate journal portion 22e at the central portion in the axial direction of the intermediate journal portion 22e. Therefore, the balance of the crankshaft 22 can be further improved.

  The second embodiment of the present invention will be described with reference to FIG. 25, but the parts corresponding to the first embodiment are only given the same reference numerals and shown in detail. Omitted.

  A pair of first oil jets 146B is provided on the upper front wall of the second case half 29 in the crankcase 23 in order to cool the pistons 31A slidably fitted into the cylinder bores 30A of the first cylinder block 24A. Are attached to the cylinder bores 30B of the second cylinder block 24B, and a pair of second oil jets 147B are opened to the crankcase 23 of the cylinder bores 30B to cool the pistons 31B. A pair of third oil jets are attached to the first case half 28 of the crankcase 23 so as to be located rearward of the ends, and cool the pistons 31A, 31B,... Of the cylinder blocks 24A, 24B. 148B... Is between the first and second cylinder blocks 24A, 24B. Attached to the first case half 28.

  The first oil jet 146B has a pair of first oil passages 202 leading to a first oil supply oil passage 150 provided in the second case half body in an oil jet main body 201 attached to the second case half body 29, and A pair of second oil passages 203 that respectively communicate with the first oil passages 202 and four jet holes 154 that respectively communicate with the second oil passages 203 so as to eject the oil toward the piston 31A. 154; 155, 155 are provided.

The oil jet body 201 includes a base portion 201a mounted on the second case half 29, the both the that out extending towards the piston 31A side from the base portion 201a jet holes 154 ..., that are 155 ... are provided The extension part 201b is integrally formed, and is fastened to the second case half 29 by a bolt 156 so as to be detachable.

  The first oil passages 202 are provided in the base 201a so as to communicate with the first oil supply oil passage 150 when the oil jet main body 201 is fastened to the second case half 29. The passages 203 are provided in the extending portion 201b so as to individually communicate with the first oil passages 202.

  The jet holes 154, 155, etc. communicating with the second oil passages 203 are provided at a plurality of locations including the tip of the extension portion 201b, and the extension portion 201b has the piston 31A at the bottom dead center. Sometimes the jet holes 154... 155... Extend from the base portion 201a in the piston 31A.

  The second oil jet 147B has a pair of oil passages 206 communicating with a second oil supply oil passage 160 provided in the first case half 28 in an oil jet main body 205 fastened to the first case half 29 with bolts 165. ... And four jet holes 163... 164... Communicating with each of the oil passages 206 so as to eject oil toward the piston 31B.

  In addition, the second oil jet 147B is formed such that the jet holes 163, 164,... Exist in the piston 31B when the piston 31B is at bottom dead center.

  The third oil jet 148B communicates with an oil jet main body 207 formed to extend in the axial direction of the crankshaft 22 in common with a pair of oil passages 208 leading to the main gallery 142 and the oil passages 208. An oil passage 209 extending in the longitudinal direction of the oil jet main body 207, a jet hole 170 leading to the oil passage 209 so as to eject oil toward the piston 31A on the first cylinder block 24A side, and a second cylinder block 24B A jet hole 171 leading to the oil passage 209 is provided so as to eject oil toward the piston 31B on the side, and the oil jet main body 207 is fastened to the first case half 28.

  In addition, the oil jet main body 207 includes a base portion 207a in which the oil passages 208, 209 are formed, an oil passage 210 that communicates with the oil passage 209, and an extension portion 207b that extends from the base portion 207a to the piston 31A side. An oil passage 211 that communicates with the oil passage 209 is formed integrally with an extension portion 207c that extends from the base portion 207a toward the piston 31B, and communicates with the oil passage 210 at the tip of one extension portion 207b. A jet hole 170 is provided, and a jet hole 171 leading to the oil passage 211 is provided at the tip of the other extending portion 207c.

  Moreover, when the pistons 31A and 31B are at the bottom dead center, the extension portions 207b and 207c are arranged so that the jet holes 170 and 171 at the tips of the extension portions 207b and 207c are in the pistons 31A and 31B. It extends from the base 207a.

  According to the second embodiment, the same effects as those of the first embodiment can be obtained, and the piston holes 154, 155, 163, 164, 170, 171. It is possible to improve the cooling performance of the pistons 31A and 31B by the oil by reliably injecting the oil to the inside of the 31A and 31B.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

22 ... crankshaft 23 ... crankcase 24A ... first cylinder block which is a cylinder block
24B: second cylinder block 28, which is a cylinder block ... first case half 29 ... second case half 30A , 30B ... cylinder bores 31A , 31B ... piston 59 ... oil pump Is a feed pump
142 ... main gallery 146A, 146B, 148A, 148B ... oil jet
149 ... Connection oil passage 150 ... First oil supply oil passage 151, 201 which is an oil supply oil passage ... Oil jet main bodies 151a, 201a ... Base portions 151b, 201b ... Extension portion 152, 202 ... 1st oil passage 153,203 ... 2nd oil passage 154,155,170 ... jet hole 156 ... bolt 158 which is a fastening member ... plug

Claims (9)

The piston (31A, 31B) bore (30A, 30B) which allowed to fit the slidably first and second cylinder blocks (24A, 24B) which are arranged so as to define respective chromatic to V-shape to each other The one case half (28) is joined, and the second case half (29) constituting the crankcase (23) together with the first case half (28) is joined to the first case half (28), and the oil In a piston cooling device for a V-type engine, an oil jet (146A, 146B) for injecting oil supplied from a pump (59) toward the piston (31A) is attached to the crankcase (23).
The main gallery receiving the oil discharged from the oil pump attached (59) to the second case half (29) (142), the first case half (28), said first, second cylinder A portion located between the blocks (24A, 24B) is provided so as to extend along the axis of the crankshaft (22), and via a connecting oil passage (149) provided in the first case half (28). An oil supply oil passage (150) communicating with the main gallery (142) is provided in the second case half (29) so as to extend along the crankshaft (22), and the oil jet (146A, 146B) is a V-type engine, characterized in that provided in the second case halves so as to be connected to the oil supply passage (150) (29) piston Cooling equipment. The oil jets (146A, 146B) are connected to oil jet main bodies (151, 201) attached to the second case half (29) through oil passages (152, 153; 202, 202) leading to the oil supply oil passage (150). 203. A piston cooling apparatus for a V-type engine according to claim 1, further comprising: 203) and jet holes (154, 155) communicating with the oil passages (152, 153). The piston cooling apparatus for a V-type engine according to claim 2, wherein the oil jet main body (151, 201) is detachably attached to the second case half (29) by a fastening member (156). The oil jet body (151,201) is a base attached to the second case half (29) (151a, 201a), that out extending towards the piston (31A) side from the base portion (151a, 201a) If both have the jet holes (154, 155) extending is provided portion (151b, 201b) and the integrally formed in the base portion so as to communicate with the oil supply passage (0.99) (151a, 201) The second oil passages (153, 203) provided in the extension portions (151b, 201b) are communicated with the first oil passages (152, 202) provided through the jet holes (154, 155). The piston cooling device for a V-type engine according to claim 3. In the second oil passage (153, 203), the opening end of the bottomed processing hole formed by drilling the extension part (151b, 201b) from the side opposite to the tip side is a plug (158). The first oil passage (152, 202) that is closed and communicates with the second oil passage (153, 203) extends in a direction intersecting with the second oil passage (153, 203). The piston cooling device for a V-type engine according to claim 4, wherein the piston cooling device is provided at a base (151a, 201a). The piston cooling of the V-type engine according to any one of claims 2 to 5, wherein the jet holes (154, 155) are provided at a plurality of locations including a tip of the extending portion (151b, 201b). apparatus. Other oil jets (148A, 148B) arranged at different positions facing the oil jets (146A, 146B) have jet holes (170) for injecting oil toward the piston (31A). The piston cooling device for a V-type engine according to any one of claims 1 to 3, wherein the piston cooling device is provided in the first case half (28). Jet holes (154, 155; 170) provided in the oil jets (146A, 146B; 148A, 148B) are arranged in the piston (31A) when the piston (31A) is at bottom dead center. 8. The piston cooling apparatus for a V-type engine according to claim 1, wherein the oil jet (146A, 146B; 148A, 148B) is formed. The other oil jets (148A, 148B) are provided in a portion of the first case half (28) positioned between the first and second cylinder blocks (24A, 24B), and the main gallery (142 8. A piston cooling device for a V-type engine according to claim 7, wherein

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