JP2011085028A - Structure of lubricating oil passage of v-type engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a lubricating oil passage of a V-type engine capable of supplying lubricating oil to journal parts of a crank shaft from multiple directions forming a lubricating oil passage around a crank shaft into an efficient route reduced in pressure loss. <P>SOLUTION: The structure of a lubricating oil passage for a V-type engine includes: a crank shaft lubricating oil passage 103 formed inside a crank shaft 41 and having an opening 107 at a shaft end of the crank shaft 41 to supply the lubricating oil to crank pins 82 and 84; an upper lubricating oil passage 104 formed by being extended in nearly parallel with a rotary shaft C of the crank shaft 41 to supply the lubricating oil to journals 71, 72 and 73; and a lower lubricating oil passage 105 formed by being extended in nearly parallel with the rotary shaft C of the crank shaft 41 and arranged opposite to the upper lubricating oil passage 104 with the crank shaft 41 between them to supply the lubricating oil to the journal parts 71, 72 and 73. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lubricating oil passage structure for a V-type engine.

  Conventionally, a lubricating oil passage structure for a V-type engine is known in which a lubricating oil passage is provided at the bottom of a valley between two V-shaped banks and the lubricating oil is supplied from the lubricating oil passage to a journal portion of a crankshaft. (For example, see Patent Document 1 and Patent Document 2).

JP 2007-224859 A JP-A-6-299838

  In the conventional V-type engine lubricating oil passage structure, an oil pump sucks lubricating oil from an oil pan provided in the lower part of the crankcase, and the journal portion of the crankshaft is passed through the lubricating oil passage provided in the bottom of the valley between the banks. Supply lubricating oil to

  Here, in general, the crankcase is divided into two parts on a dividing surface along the rotation axis of the crankshaft (for example, a first crankcase on the cylinder side and a second crankcase on the other side). ).

  Since a fastening member for connecting the divided members (the first crankcase and the second crankcase) is necessary, the conventional lubricating oil passage structure of the V-type engine is provided at the bottom of the valley between the oil pump and the bank. The lubricating oil passage that guides the lubricating oil to the provided lubricating oil passage is largely bypassed (see, for example, Patent Document 1).

  On the other hand, the lubricating oil passage structure of the V-type engine described in the cited document 2 guides the lubricating oil from both ends of the crankshaft to the crankpin corresponding to each bank, so that the lubricating oil is guided to both ends of the crankshaft. . The lubricating oil passage structure of the V-type engine described in the cited document 2 leads the lubricating oil to the lubricating oil passage provided in the bottom of the valley between the banks continuously from both shaft ends of the crankshaft. Supply lubricant to the journal.

  Here, the V-type engine described in the cited document 2 is provided with a gear train mechanism on its side surface that transmits the rotation of the crankshaft to the valve gear. The intermediate gear of this gear train mechanism is disposed on the side of the bottom between the banks. In order to avoid the gear shaft of the intermediate gear, the lubricating oil passage structure of the V-type engine described in the cited document 2 applies lubricating oil to the lubricating oil passage provided at the bottom of the valley between the banks from the shaft end of the crankshaft. It is necessary to bypass the guiding lubricating oil passage.

  Such bypassing of the lubricating oil passage in the lubricating oil passage structure of the V-type engine increases the pressure loss.

  Further, in the conventional V-type engine lubricating oil passage structure, the lubricating oil is supplied only from one direction (the lubricating oil passage provided at the bottom of the valley between the banks) to the journal portion of the crankshaft. For this reason, the slide bearing provided in the journal portion requires an oil groove capable of supplying lubricating oil to the entire circumference of the sliding surface.

  Accordingly, the present invention provides a lubricating oil passage structure for a V-type engine in which the lubricating oil passage around the crankshaft is configured with an efficient passage with little pressure loss and the lubricating oil can be supplied to the journal portion of the crankshaft from multiple directions. Propose.

  In order to solve the above-mentioned problems, a lubricating oil passage structure for a V-type engine according to the present invention is a first structure that is formed in a crankshaft and has an opening at one end of the crankshaft to supply lubricating oil to a crankpin. A lubricating oil passage, a second lubricating oil passage formed to extend substantially parallel to the rotation axis of the crankshaft and supplying lubricating oil to the journal portion of the crankshaft, and substantially to the rotation shaft of the crankshaft A third lubricating oil passage that extends in parallel and is disposed so as to face the crankshaft together with the second lubricating oil passage, and supplies lubricating oil to the journal portion. To do.

  According to the present invention, the lubricating oil passage structure of the V-type engine is configured such that the lubricating oil passage around the crankshaft is configured by an efficient passage with little pressure loss and the lubricating oil can be supplied to the journal portion of the crankshaft from multiple directions. Can provide.

The left side view showing the motorcycle carrying the lubricating oil passage structure of the V type engine concerning the embodiment of the present invention. The right view which showed the engine provided with the lubricating oil passage structure of the V-type engine which concerns on embodiment of this invention. The sectional view showing the engine provided with the lubricating oil passage structure of the V type engine concerning the embodiment of the present invention. The left view which showed the engine provided with the lubricating oil channel structure of the V-type engine which concerns on embodiment of this invention. The sectional view showing the engine provided with the lubricating oil passage structure of the V type engine concerning the embodiment of the present invention. The sectional view showing the engine provided with the lubricating oil passage structure of the V type engine concerning the embodiment of the present invention. The sectional view showing the engine provided with the lubricating oil passage structure of the V type engine concerning the embodiment of the present invention.

  Embodiments of a lubricating oil passage structure for a V-type engine according to the present invention will be described below with reference to FIGS. In the following description, the up / down, front / back, left / right directions are the same as those of the motorcycle 1.

  FIG. 1 is a left side view showing a motorcycle equipped with a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention.

  As shown in FIG. 1, the motorcycle 1 includes a body frame 2 constituting a framework.

  The body frame 2 is of a twin tube type, for example. The body frame 2 includes a head pipe 4 installed on the front side, a pair of left and right main frames 5 that are expanded in the vehicle width direction immediately after the head pipe 4 and extend obliquely downward on the rear side, and the rear of the main frame 5. A pair of left and right center frames 6 integrally formed at the end and extending substantially downward, and a pair of left and right seat rails 8 extending obliquely rearward and upward from the rear end of the main frame 5 are provided.

  The head pipe 4 pivotally supports a steering mechanism 11 disposed on the front side of the vehicle body frame 2. The center frame 6 includes a pivot portion 12 at a lower rear portion. The pivot portion 12 pivotally supports a rear wheel suspension device 13 disposed on the rear side of the vehicle body frame 2.

  The steering mechanism 11 is pivotally supported with respect to the body frame 2 so as to be rotatable in the left-right direction. The steering mechanism 11 includes a steering head (not shown) pivotally supported on the head pipe 4, a pair of left and right front forks 15 provided on the steering head, and a front wheel pivotally supported on the lower portion of the front fork 15. 16, a front fender 17 that is provided on the front fork 15 and covers an upper portion of the front wheel 16, and a handle bar 18 provided above the steering head. The steering mechanism 11 rotates the front wheel 16 left and right by steering applied to the handlebar 18.

  The rear wheel suspension device 13 is pivotally supported with respect to the vehicle body frame 2 so as to be swingable in the vertical direction. The rear wheel suspension device 13 includes a swing arm 22 having a front end pivotally attached to a pivot shaft 21, a rear wheel 23 pivotally supported on the rear end of the swing arm 22, and the swing arm 22 elastically attached to the vehicle body frame 2. A suspension to be supported (not shown).

  The motorcycle 1 also includes an engine 26 mounted below the main frame 5.

  The engine 26 is a V-type engine in which a first bank 28 disposed in the front and a second bank 29 disposed in the rear form a V-shape. The intake side of the engine 26 is connected to a throttle body (not shown) provided with a throttle valve (not shown), while the exhaust side of the engine 26 is connected to an exhaust pipe 31. The exhaust pipe 31 extends around the right side of the engine 26 and extends behind the vehicle body frame 2. The rear end of the exhaust pipe 31 is connected to the exhaust muffler 32. The power of the engine 26 is transmitted to the rear wheel 23 through a drive sprocket (not shown), a chain 33, and a driven sprocket 34 in order.

  The motorcycle 1 further includes a fuel tank 35 disposed above the engine 26, a rider's seating seat 36 disposed behind the fuel tank 35, and a rear frame that covers the lower and rear portions of the seating seat 36. A cover 37 and a rear fender 38 extending from the rear portion of the seating seat 36 toward the rear of the vehicle body frame 2 and covering the upper portion of the rear wheel 23 are provided.

  Furthermore, the motorcycle 1 is covered with a streamlined cowling 39 from at least a part of the vehicle body, specifically, from the front part of the vehicle body to the center lower part. The cowling 39 reduces the air resistance during traveling of the motorcycle 1 and protects the rider from the traveling wind pressure.

  FIG. 2 is a right side view showing an engine having a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention.

  As shown in FIG. 2, the engine 26 is a water-cooled four-stroke V-type four-cylinder engine. The engine 26 is mounted on the body frame 2 as a prime mover of the motorcycle 1 such that the rotation axis C of the crankshaft 41 is orthogonal to the vehicle traveling direction (that is, along the vehicle width direction).

  The engine 26 includes a crankcase 42 on which a crankshaft 41 is pivotally supported, a first bank 28 erected obliquely forward and upward from the front upper portion of the crankcase 42, and a diagonally rear side from a rear portion of the first bank 28. A second bank 29 erected upward, an oil pan 43 provided at the lower part of the crankcase 42, and an oil filter 44 provided at the front lower part of the crankcase 42 are provided.

  The first bank 28 and the second bank 29 are respectively a cylinder body 46 provided integrally with the crankcase 42, a cylinder head 47 provided at the upper end of the cylinder body 46, and a head cover provided at the upper end of the cylinder head 47. 48.

  The engine 26 includes a crankshaft 41 that is rotatably accommodated in the front half of the crankcase 42, and a clutch (not shown) and a transmission (not shown) that are accommodated in the rear half of the crankcase 42. .

  The clutch interrupts power transmission between the crankshaft 41 and the transmission.

  The transmission includes a countershaft 51 having a rotation axis parallel to the rotation axis C of the crankshaft 41 and a drive shaft (not shown).

  FIG. 3 is a cross-sectional view showing an engine having a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention. 3 is a cross-sectional view taken along line III-III in FIG.

  As shown in FIG. 3, the engine 26 includes a valve operating device (not shown) housed in the cylinder head 47 and the head cover 48 of each bank 28, 29, and a valve operating device of each bank 28, 29 from the crankshaft 41. A gear train device 52 for transmitting a driving force.

  The valve gear is, for example, a double overhead camshaft (DOHC: Double Over Camshaft) valve gear, and includes camshafts 54 independently on the intake side and the exhaust side. The camshaft 54 is linked to the crankshaft 41 via the gear train device 52 to open and close an intake valve (not shown) and an exhaust valve (not shown).

  The gear train device 52 is disposed on one side surface of the engine 26 (here, the side surface located on the right side of the motorcycle 1) and is accommodated in a gear train chamber 55 formed across the banks 28 and 29 and the crankcase 42. Is done. The gear train chamber 55 also functions as a return path for the lubricating oil supplied to the valve operating mechanism.

  The gear train device 52 includes a cam drive gear 56 that rotates integrally with the crankshaft 41, and a second gear 57 that distributes the driving force transmitted from the cam drive gear 56 to the first bank 28 and the second bank 29 ( Intermediate gear), a third gear 58 provided in each of the banks 28 and 29 and driven by the second gear 57, a force gear 59 provided in each of the banks 28 and 29 and driven by the third gear 58, and each camshaft 54. And a cam driven gear 61 that is driven by a force gear 59.

  FIG. 4 is a left side view showing an engine having a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention.

  As shown in FIG. 4, the engine 26 includes a water pump 63 that circulates cooling water in the vicinity of the valleys of the banks 28 and 29.

  The water pump 63 circulates cooling water in a water jacket (not shown) formed in the engine 26.

  FIG. 5 is a cross-sectional view showing an engine having a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention. 5 is a cross-sectional view taken along the line VV in FIG.

  As shown in FIG. 5, the engine 26 includes a balancer device (not shown) housed in the crankcase 42 and driven in cooperation with the crankshaft 41.

  The balancer device functions as a moment balancer that suppresses vibration during operation of the engine 26 and cancels the torsional moment of the crankshaft 41 by generating a reaction force in the opposite phase to the combustion timing that differs between the cylinders.

  Further, the balancer device includes a balancer shaft 64 that is supported by the crankcase 42 and has a rotation axis parallel to the rotation axis C of the crankshaft 41, and a balancer driven gear 65 that rotates together with the balancer shaft 64. The balancer driven gear 65 is meshed with a drive gear 66 that is rotated integrally with the crankshaft 41 to drive the balancer device to the crankshaft 41 in a coordinated manner.

  The drive gear 66 of the crankshaft 41 is meshed with a reduction gear 67 in addition to the balancer driven gear 65. The reduction gear 67 is meshed with a water pump driven gear 68 that drives the water pump 63. The reduction gear 67 and the water pump driven gear 68 are supported by the crankcase 42 and have a rotation axis parallel to the rotation axis C of the crankshaft 41.

  FIG. 6 is a cross-sectional view showing an engine having a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention. FIG. 6 is a cross-sectional view along the rotation axis of the crankshaft 41.

  As shown in FIG. 6, the crankshaft 41 of the engine 26 includes a first journal portion 71 positioned in the vicinity of an end portion on one side where the cam drive gear 56 is provided (here, the right side of the motorcycle 1), A second journal portion 72 located at a substantially central portion in the rotation axis direction of the crankshaft 41 and a second portion located near the end portion on the other side (here, the left side of the motorcycle 1) provided with the drive gear 66. Three journal parts 73.

  The first journal portion 71 is pivotally supported by a first bearing portion 77 formed in the crankcase 42 via a first metal bearing 74 that is a slide bearing. Similarly, the second journal part 72 and the third journal part 73 are pivotally supported by the second bearing part 78 and the third bearing part 79 via the second metal bearing 75 and the third metal bearing 76.

  A first crank pin 82 is supported between the first journal portion 71 and the second journal portion 72 via a pair of crank webs 81a and 81b. The second crankpin 84 is supported between the second journal portion 72 and the third journal portion 73 via a pair of crank webs 83a and 83b.

  The engine 26 is adjacent to the primary drive gear 86 provided adjacent to the first journal portion 71 at the end of one side of the crankshaft 41 (here, the right side of the motorcycle 1). And a cam drive gear 56 provided. The primary drive gear 86 and the cam drive gear 56 have a rotation axis that is coaxial with the rotation axis C of the crankshaft 41.

  The crankshaft 41 includes a fastening member 87 that fixes the primary drive gear 86 and the cam drive gear 56 to the end of one side (here, the right side of the motorcycle 1) so as to be screwed together. The fastening member 87 includes a cylindrical protrusion 88 that constitutes a free end on one side of the crankshaft 41 (here, the right side of the motorcycle 1).

  Further, the engine 26 includes a drive gear 66 provided adjacent to the third journal portion 73 at the other end of the crankshaft 41 (here, the left side of the motorcycle 1). The drive gear 66 has a rotation axis that is coaxial with the rotation axis C of the crankshaft 41.

  The crankshaft 41 includes a fastening member 89 that fixes the drive gear 66 to the other end (here, the left side of the motorcycle 1) so as to be screwed.

  Furthermore, the engine 26 includes an engine cover 91 that covers the gear train chamber 55 on one side of the crankcase 42 (here, the right side of the motorcycle 1).

  The engine cover 91 includes a free end on one side of the crankshaft 41 (here, the right side of the motorcycle 1), that is, a cup-shaped bearing holding portion 93 that holds a bearing 92 that pivotally supports the cylindrical protruding portion 88 of the fastening member 87. Prepare.

  The engine cover 91 holds the gear shaft 94 together with the crankcase 42. The gear shaft 94 pivotally supports the second gear 57 of the gear train device 52 meshed with the cam drive gear 56.

  FIG. 7 is a cross-sectional view showing an engine having a lubricating oil passage structure for a V-type engine according to an embodiment of the present invention. 7 is a cross-sectional view taken along line VII-VII in FIG.

  As shown in FIG. 7, the engine 26 includes an oil pump 96 that pumps lubricating oil under the crankcase 42.

  The oil pump 96 operates in accordance with the rotational drive of the crankshaft 41 via a pump drive sprocket (not shown) fixed to the countershaft 51 and the like. The suction chamber 96 a of the oil pump 96 communicates with an oil strainer 98 that extends toward the oil pan 43. The discharge chamber 96 b of the oil pump 96 is communicated with the oil filter 44 through the discharge passage 99.

  During operation of the engine 26, the oil pump 96 is operated via the crankshaft 41 and the countershaft 51. Then, the oil pump 96 sucks the lubricating oil stored in the oil pan 43 via the oil strainer 98 and discharges it into the oil filter 44 via the discharge passage 99. The lubricating oil that has passed through the oil filter 44 passes through the lubricating oil passage 101 (lubricating oil passage structure) formed in the engine 26 and is pumped to each oil supply location. The lubricating oil supplied to each oil supply location returns to the oil pan 43 by natural dripping or the like, and is again pumped by the oil pump 96 and circulates in the engine 26.

  Here, as shown in FIGS. 6 and 7, the lubricating oil passage 101 of the engine 26 includes a crankshaft lubricating oil passage 103 (first lubricating oil passage) formed in the crankshaft 41 and the rotation of the crankshaft 41. An upper lubricating oil passage 104 (second lubricating oil passage) and a lower lubricating oil passage 105 (third lubricating oil passage) formed so as to extend substantially parallel to the axis C are provided.

  The crankshaft lubricating oil passage 103 supplies lubricating oil to the first crankpin 82 and the second crankpin 84.

  The crankshaft lubricating oil passage 103 has an opening 107 at the shaft end on one side of the crankshaft 41 (here, the right side of the motorcycle 1), and a central lubricating oil passage 108 along the rotation axis C of the crankshaft 41. The first crank pin 82 is formed obliquely with respect to the rotational axis C and is formed with the first inclined lubricating oil passage 109 communicated with the central lubricating oil passage 108 and the first crank pin 82 is formed obliquely with respect to the rotational axis C. A second inclined lubricating oil passage 111 communicated with the first inclined lubricating oil passage 109 and a third inclined lubricating oil passage 111 formed on the second crankpin 84 at an angle with respect to the rotation axis C and communicated with the second inclined lubricating oil passage 111. An inclined lubricating oil passage 112 and a fourth inclined lubricating oil passage 113 formed obliquely with respect to the rotation axis C in the second crank pin 84 and communicated with the third inclined lubricating oil passage 112 are provided.

  The central lubricating oil passage 108 is formed through the fastening member 87 to the vicinity of the crank web 81a.

  The first inclined lubricating oil passage 109 is formed from the crank journal 81 b on the second journal portion 72 side and the vicinity of the first crank pin 82 to the first journal portion 71 and the central lubricating oil passage 108.

  The second inclined lubricating oil passage 111 is formed from the crank journal 81 a side of the first journal portion 71 and the vicinity of the first crank pin 82 to the second journal portion 72 and the third inclined lubricating oil passage 112.

  The first inclined lubricating oil passage 109 and the second inclined lubricating oil passage 111 include an oil hole 114 communicated with the outer peripheral surface of the first crankpin 82. The lubricating oil flowing out from the oil hole 114 lubricates the sliding contact surface between the first crank pin 82 and the large end (not shown) of the connecting rod.

  The third inclined lubricating oil passage 112 is formed from the crank journal 83b side of the third journal portion 73 and the vicinity of the second crank pin 84 to the second journal portion 72 and the second inclined lubricating oil passage 111.

  The fourth inclined lubricant passage 113 is formed from the second journal portion 72 side of the crank web 83a and the vicinity of the second crankpin 84 to the third journal portion 73, and terminates the crankshaft lubricant passage 103.

  The third inclined lubricating oil passage 112 and the fourth inclined lubricating oil passage 113 include an oil hole 115 communicating with the outer peripheral surface of the second crankpin 84. The lubricating oil flowing out from the oil hole 115 lubricates the sliding contact surface between the second crank pin 84 and the large end (not shown) of the connecting rod.

  The upper lubricating oil passage 104 and the lower lubricating oil passage 105 supply lubricating oil to the journal portions 71, 72, 73 of the crankshaft 41. The upper lubricating oil passage 104 and the lower lubricating oil passage 105 have substantially the same length as the crankshaft 41 and are formed to extend in the vehicle width direction.

  Similar to the crankshaft lubricating oil passage 103, the upper lubricating oil passage 104 has an opening 104a on one side of the crankcase 42 (here, the right side of the motorcycle 1). The upper lubricating oil passage 104 is disposed at the bottom of the valley between the banks 28 and 29.

  Further, the upper lubricating oil passage 104 is connected to the gear shaft side lubricating oil passage 116 (fifth lubricating oil passage) formed in the gear shaft 94 that supports the second gear 57 and the gear shaft side lubricating oil passage 116. And a crankcase side lubricating oil passage 117 formed in the crankcase 42.

  Furthermore, the upper lubricating oil passage 104 guides the lubricating oil to the banks 28 and 29 and supplies the lubricating oil around the piston (not shown) and the lubricating oil passage (not shown) for supplying the transmission oil to the transmission. A piston jet (not shown) to be supplied and a lubricating oil passage (not shown) for supplying lubricating oil to the valve operating device are communicated.

  On the other hand, the lower lubricating oil passage 105 is formed in the crankcase 42 and has an opening 105 a on one side of the crankcase 42 (here, the right side of the motorcycle 1), like the crankshaft lubricating oil passage 103. Further, the lower lubricating oil passage 105 is disposed below the crankcase 42 so as to face the crankshaft 41 together with the upper lubricating oil passage 104. A lubricating oil introduction passage 118 through which lubricating oil is introduced from the oil filter 44 is communicated with the central portion of the lower lubricating oil passage 105.

  Further, the lubricant passage 101 is connected to the engine cover 91 attached to one side of the crankcase 42 (here, the right side of the motorcycle 1), the crankshaft lubricant passage 103, the upper lubricant passage 104, and the lower lubricant passage 105. Is provided with a linear lubricating oil communication passage 121 (fourth lubricating oil passage).

  The lubricating oil communication passage 121 communicates with the lubricating oil passages 103, 104, and 105 through the respective openings 107, 104a, and 105a.

  When the water pump 63 is not disposed near the center of the banks 28 and 29, the lubricating oil passage 101 is attached to the other side of the crankcase 42 (here, the left side of the motorcycle 1). It may be provided on the engine cover.

  Further, the lubricating oil passage 101 extends in a substantially radial direction (substantially orthogonal direction) with respect to the rotation axis C of the crankshaft 41 and is formed in the crankcase 42 so as to form an upper bearing lubricating oil passage 122 (sixth lubricating oil passage). And formed in the crankcase 42 so as to extend in a substantially radial direction (substantially orthogonal direction) with respect to the rotation axis C of the crankshaft 41, and in a substantially opposite phase of the upper bearing lubricating oil passage 122 when viewed around the rotation axis C. And a lower bearing lubricating oil passage 123 (seventh lubricating oil passage).

  The upper bearing lubricating oil passage 122 supplies lubricating oil from the upper lubricating oil passage 104 to the respective journal portions 71, 72, 73.

  The lower bearing lubricating oil passage 123 supplies lubricating oil from the lower lubricating oil passage 105 to the respective journal portions 71, 72, 73.

  The lubricating oil passage 101 configured in this manner guides the lubricating oil that has passed through the oil filter 44 from the lubricating oil introduction passage 118 to the lower lubricating oil passage 105 when the oil pump 96 is operated in accordance with the operation of the engine 26.

  Next, the lubricating oil passage 101 supplies the lubricating oil guided to the lower lubricating oil passage 105 from the lower bearing lubricating oil passage 123 to the journal portions 71, 72, 73 and also to the lubricating oil communication passage 121 of the engine cover 91. invite.

  Next, the lubricating oil passage 101 guides the lubricating oil guided to the lubricating oil communication passage 121 to the crankshaft lubricating oil passage 103 and the upper lubricating oil passage 104.

  Next, the lubricating oil passage 101 supplies the lubricating oil guided to the crankshaft lubricating oil passage 103 to the first crankpin 82 and the second crankpin 84.

  Next, the lubricating oil passage 101 supplies the lubricating oil guided to the upper lubricating oil passage 104 from the upper bearing lubricating oil passage 122 to the journal portions 71, 72, 73, and supplies the lubricating oil to the transmission. It guides to the passage and the lubricating oil passage which supplies lubricating oil to the piston jet and the valve operating device.

  The lubricating oil passage 101 according to the present embodiment is constrained by a divided portion of the crankcase 42 and a fastening member for joining the divided members by forming the lubricating oil communication passage 121 in the engine cover 91. Therefore, a lubricating oil passage having a small pressure loss can be configured.

  In addition, the lubricating oil passage 101 according to the present embodiment is connected to the crankshaft lubricating oil passage 103 and the upper portion by the gear shaft side lubricating oil passage 116 formed in the gear shaft 94 that pivotally supports the second gear 57 of the gear train device 52. The openings 107, 94 a, 95 a of the lubricating oil passage 104 and the lower lubricating oil passage 105 can be arranged in a substantially straight line, and the upper lubricating oil passage 104 and the lower lubricating oil can be disposed without bypassing the lubricating oil communication passage 121. The oil passage 105 can be communicated. Thereby, the lubricating oil passage 101 according to the present embodiment can reduce resistance when supplying the lubricating oil, and can greatly improve the machining accuracy and workability of the upper lubricating oil passage 104 and the lower lubricating oil passage 105.

  Furthermore, the lubricating oil passage 101 according to the present embodiment can supply the lubricating oil to the journal portions 71, 72, and 73 from the upper lubricating oil passage 104 and the lower lubricating oil passage 105 that face each other with the crankshaft 41 interposed therebetween. As a result, the engine 26 can simplify the oil grooves formed in the metal bearings 74, 75, and 76, so that the dimensions of the metal bearings 74, 75, and 76 in the rotation axis direction can be shortened, and the rotation axis direction of the crankshaft 41 can be reduced. The length can be shortened and the rigidity can be improved.

  Therefore, according to the present invention, the lubricating oil passage around the crankshaft 41 can be configured with an efficient path with little pressure loss, and the lubricating oil can be supplied to the journal portions 71, 72, 73 of the crankshaft 41 from multiple directions. .

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 4 Head pipe 5 Main frame 6 Center frame 8 Seat rail 11 Steering mechanism 12 Pivot part 13 Rear wheel suspension device 15 Front fork 16 Front wheel 17 Front fender 18 Handle bar 21 Pivot shaft 22 Swing arm 23 Rear wheel 26 Engine 28 First bank 29 Second bank 31 Exhaust pipe 32 Exhaust muffler 33 Chain 34 Driven sprocket 35 Fuel tank 36 Seating seat 37 Rear frame cover 38 Rear fender 39 Cowling 41 Crankshaft 42 Crankcase 43 Oil pan 44 Oil filter 46 Cylinder body 47 Cylinder head 48 Head cover 51 Counter shaft 52 Gear train device 54 Cam shaft 55 Gear train chamber 56 Cam drive gear 5 7 Second gear 58 Third gear 59 Force gear 61 Cam driven gear 63 Water pump 64 Balancer shaft 65 Balancer driven gear 66 Drive gear 67 Reduction gear 68 Water pump driven gear 71 First journal portion 72 Second journal portion 73 Third journal portion 74 First metal bearing 75 Second metal bearing 76 Third metal bearing 77 First bearing portion 78 Second bearing portion 79 Third bearing portions 81a, 81b Crank web 82 First crank pins 83a, 83b Crank web 84 Second crank pin 86 Primary drive gear 87 Fastening member 88 Cylindrical protrusion 89 Fastening member 91 Engine cover 92 Bearing 93 Bearing holding part 94 Gear shaft 96 Oil pump 96a Suction chamber 96b Discharge chamber 98 Oil strainer 99 Discharge Path 101 Lubricating oil path 103 Crankshaft lubricating oil path 104 Upper lubricating oil path 104a Opening 105 Lower lubricating oil path 105a Opening 107 Opening 108 Central lubricating oil path 109 First inclined lubricating oil path 111 Second inclined lubricating oil path 112 Third inclined Lubricating oil passage 113 Fourth inclined lubricating oil passages 114, 115 Oil hole 116 Gear shaft side lubricating oil passage 117 Crankcase side lubricating oil passage 118 Lubricating oil introduction passage 121 Lubricating oil communication passage 122 Upper bearing lubricating oil passage 123 Lower bearing lubricating oil aisle

Claims (5)

A first lubricating oil passage formed in the crankshaft and having an opening at one end of the crankshaft for supplying lubricating oil to the crankpin;
A second lubricating oil passage formed to extend substantially parallel to the rotation shaft of the crankshaft and supplying lubricating oil to the journal portion of the crankshaft;
A third lubricating oil passage that is formed so as to extend substantially parallel to the rotation shaft of the crankshaft and that is arranged to face the crankshaft together with the second lubricating oil passage and supplies lubricating oil to the journal portion. And a lubricating oil passage structure for a V-type engine. An engine cover attached to one side surface of the crankcase is provided with a linear fourth lubricating oil passage that communicates the first lubricating oil passage, the second lubricating oil passage, and the third lubricating oil passage. The lubricating oil passage structure for a V-type engine according to claim 1. The lubricating oil passage structure for a V-type engine according to claim 2, wherein the second lubricating oil passage is arranged at the bottom of the valley between the banks. The second lubricating oil passage is a fifth lubricating oil passage formed in a gear shaft that supports an intermediate gear of a gear train device that transmits a driving force from the crankshaft to a valve operating device provided in each bank. 4. A lubricating oil passage structure for a V-type engine according to claim 2, further comprising a lubricating oil passage structure. A sixth lubricating oil passage formed to extend in a substantially radial direction with respect to the rotation shaft of the crankshaft and supplying lubricating oil from the second lubricating oil passage to the journal portion;
The journal is formed so as to extend in a substantially radial direction with respect to the rotation shaft of the crankshaft, and is disposed in a substantially opposite phase to the sixth lubricant passage as viewed around the rotation shaft of the crankshaft. The lubricating oil passage structure for a V-type engine according to any one of claims 1 to 4, further comprising a seventh lubricating oil passage for supplying lubricating oil to the section.

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