JP2018105125A - vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of discharging oil from an oil pan when a drain bolt is removed from the oil pan in a vehicle including the oil pan in which a rib for inhibiting swing of the oil in a fore and aft direction during traveling is provided.SOLUTION: An oil pan of a vehicle has: a storage part; a partition wall part which is connected with both sides of the storage part in a vehicle width direction and partitions an internal space in a fore and aft direction; an opening portion formed below an upper end of the partition wall part and allows oil to flow in the fore and aft direction; and a drain hole communicating with the opening portion and having an inner peripheral surface provided with a female screw part with which a drain bolt is threadedly engaged. A tip of the drain bolt which is inserted into the drain hole protrudes from the drain hole to the interior of the opening portion to cause the tip of the drain bolt and the opening portion to be disposed in an overlapping manner when viewed in the fore and aft direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle such as a motorcycle.

  A vehicle such as a motorcycle includes, for example, an oil pan that is attached to a lower portion of the engine and stores oil circulated through the engine, and an oil pump that sucks up the oil in the oil pan and supplies the oil to the engine. ing.

  In vehicles, the oil oscillates back and forth in the oil pan during driving, and the oil pump bites in the air, reducing the amount of oil sucked up by the oil pump and reducing the efficiency of oil supply to the engine. There is a case. For this reason, for example, Patent Document 1 discloses an oil pan in which ribs for suppressing oil from shaking in the front-rear direction are provided.

JP 2006-37777 A

  In an oil pan with ribs inside, when draining the drain bolt and draining the oil from the drain hole, the oil will not flow easily due to the rib and may remain inside the oil pan, reducing the oil draining efficiency. is there.

  Therefore, the present invention relates to a vehicle equipped with an oil pan in which a rib for suppressing oil swaying in the front-rear direction during travel is provided, and the oil drainage efficiency from the oil pan when the drain bolt is removed from the oil pan It aims to improve.

  In order to solve the above problems, a straddle-type vehicle according to an aspect of the present invention includes a traveling engine, an oil pan that is attached to a lower portion of the engine and stores oil, and is detachable from the oil pan. A screw that is screwed onto the oil pan and drained from the oil pan to drain the oil inside the oil pan to the outside of the oil pan; An oil pump that supplies the oil pan, the oil pan extending in a vehicle width direction inside the internal space, the storage portion having an internal space in which the oil is stored, and the vehicle width of the storage portion A partition wall part that is connected to both sides in the direction and partitions the internal space in the front-rear direction, and is formed below the upper end of the partition wall part, and distributes the oil in the front-rear direction And a drain hole provided with a female screw portion that is in communication with the opening portion and is screwed into the inner peripheral surface of the drain bolt, and the drain bolt is screwed into the female screw portion. The drain bolt inserted into the drain hole protrudes into the opening from the drain hole, so that the drain bolt has the tip and the opening as viewed in the front-rear direction. Arranged overlapping.

  According to the above configuration, the partition wall portions that are connected to both sides of the storage portion in the vehicle width direction and extend in the vehicle width direction in the oil pan partition the internal space of the oil pan in the front-rear direction. It is possible to effectively suppress the oil swaying in the front-rear direction during traveling by the partition wall portion in the entire vehicle width direction.

  Furthermore, in a state where the drain bolt is screwed into the female screw portion, the tip end portion of the drain bolt inserted into the drain hole projects into the opening portion from the drain hole, so that the tip end portion and the opening portion of the drain bolt are However, since they are arranged so as to overlap in the front-rear direction, oil can be collected in the region of the opening portion partitioned by the drain bolt by removing the drain bolt from the drain hole. For this reason, when the vehicle is not running, the oil can be easily guided from the opening to the drain hole when the drain bolt is removed from the drain hole and the oil is discharged. It is possible to prevent oil from remaining and improve the efficiency of oil discharge from the oil pan.

  In the state where the drain bolt is screwed into the female screw portion, the dimension of the opening area of the opening portion in the vehicle width direction is the vehicle of the opening area in the state where the drain bolt is detached from the female screw portion. You may reduce rather than the dimension of the width direction.

  According to the above configuration, the opening of the opening portion is maintained while maintaining the position of the upper end of the opening edge of the opening portion by exchanging drain bolts having different length dimensions of the tip portion protruding from the drain hole to the inside of the opening portion. By changing the dimension of the area in the vehicle width direction, the amount of oil flowing through the opening can be easily changed. Therefore, even if the dimension of the opening area in the vehicle width direction changes, the oil can be prevented from swaying in the front-rear direction inside the oil pan by the partition wall portion, and the oil can be easily discharged stably from the drain hole.

  As seen from one direction perpendicular to the thickness direction of the partition wall portion, at least a part of the drain hole may be disposed at a position overlapping the partition wall portion of the oil pan. Thereby, as viewed from one direction perpendicular to the thickness direction of the partition wall portion, at least a part of the drain hole is disposed at a position overlapping the partition wall portion of the oil pan. Shaking in the front-rear direction can be suppressed by the partition wall portion, and oil can be guided to the drain hole along the wall surface of the partition wall portion, and the oil can be easily discharged efficiently from the drain hole.

  The drain hole may extend in the direction in which the wall surface of the partition wall extends as viewed from the one direction. Thereby, while being able to make an opening part and a drain hole easy to form in an oil pan, the space efficiency which arrange | positions a drain bolt can be improved.

  A part of the inner peripheral surface of the drain hole may be formed by a bottom portion of the storage portion, and the drain hole may extend in a direction in which the bottom portion extends. Thereby, the oil inside the oil pan can be easily guided to the drain hole, and the oil discharge efficiency can be further enhanced.

  Inside the oil pan, behind the partition wall portion, below the upper end of the partition wall portion, a suction port for sucking up the oil, attached to the suction port, and sucked up from the suction port And a filter for filtering the oil to be produced.

  According to the above configuration, the filter is attached to the oil pump suction port disposed behind the partition wall portion and below the upper end of the partition wall portion inside the oil pan. The oil discharge efficiency can be improved, and the oil whose shaking in the front-rear direction can be suppressed by the partition wall can be sucked up by the oil pump through the filter and can be stably supplied to the engine.

  An exhaust pipe connected to the engine and disposed below one side of the engine in the vehicle width direction is further provided, and a mating surface of the engine and the oil pan rises from the front toward the rear. The oil pan extends in a gradient, and the oil pan extends in the vehicle width direction of the engine from a first region extending in the front-rear direction on the other side of the vehicle width direction of the engine and from the rear side of the first region. A second region extending to the one side and having a bottom surface height position higher than the bottom surface height position of the first region, and the exhaust pipe is directly below the second region, in the front-rear direction. It may extend to.

  According to the above configuration, since the mating surfaces of the engine and the oil pan extend from the front to the rear and incline with a slope, it is easy to shorten the front and rear length of the engine and to make the engine compact. However, the capacity of the engine crankcase can be greatly increased.

  Also, the mating surfaces of the engine and the oil pan extend from the front to the rear in an upwardly inclined manner, and extend from the rear side of the first region of the oil pan to one side in the vehicle width direction of the engine. Since the exhaust pipe extends in the front-rear direction immediately below the second region where the height position of the bottom surface is higher than the height position of the bottom surface of the first region, improving the arrangement efficiency of the exhaust pipe and the oil pan, The lower part of the engine can be widely covered with the first region and the second region of the oil pan. As a result, the oil can be prevented from shaking in the front-rear direction inside the oil pan by the partition wall, and the oil can be prevented from remaining in the oil pan by the opening, and the oil that has passed through the engine can be prevented by the oil pan. It can be recovered well.

  In a cross section perpendicular to the front-rear direction, the second region may be continuous with the first region while inclining downward from the one side in the vehicle width direction of the engine toward the other side. .

  As a result, the oil can be prevented from swaying in the front-rear direction in the oil pan by the partition wall, and the oil can be prevented from remaining in the oil pan by the opening, and the oil moved from the engine to the second region can be prevented. Can be smoothly guided toward the first region.

  According to each of the above aspects of the present invention, in a vehicle including an oil pan provided with a rib that suppresses swaying of the oil in the front-rear direction during traveling, from the oil pan when the drain bolt is removed from the oil pan. The oil drainage efficiency can be improved.

Fig. 2 is a left side view of a main part of the motorcycle according to the embodiment. It is the perspective view which looked down at the oil pan of FIG. 1 from diagonally downward from the front. FIG. 2 is a vertical sectional view perpendicular to the vehicle width direction as viewed from the left front of the oil pan of FIG. 1. FIG. 2 is a vertical cross-sectional view perpendicular to the vehicle width direction as viewed from the left side of the oil bread of FIG. It is a bottom view of the engine and oil pan of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1.

  Embodiments of the present invention will be described with reference to the drawings. The direction described below is based on the direction seen from the passenger of the motorcycle 1.

  As shown in FIG. 1, a motorcycle 1 is an example of a vehicle, and includes a body frame 2, a traveling engine 3, an oil pan 4, a radiator 5, a fan 6, a piping unit 7, an exhaust pipe 8, and a drain bolt 9. The oil pump 10 and the side stand 20 are provided. The motorcycle 1 also includes a seat on which a rider rides, a rear wheel, a swing arm that pivotally supports the rear wheel, and a muffler connected to the downstream end of the exhaust pipe 8. The motorcycle 1 includes two oil filters (an oil filter unit 19 and a filter 28), as will be described later.

  The vehicle body frame 2 includes a head pipe 2a that extends in the vertical direction on the front side of the vehicle body, an upper frame portion 2b that is divided from the upper portion of the head pipe 2a to the left and right and extends in the front-rear direction, and a lower portion of the head pipe 2a below the upper frame portion 2b. The lower frame part 2c is divided into left and right parts from the lower part and extends in the front-rear direction, and the pivot frame part 2d connected to the lower frame part 2c and extending in the up-down direction at the center of the body frame 2 in the front-rear direction.

  A steering stem of a steering member is pivotally supported on the head pipe 2a. An engine 3 and a radiator 5 are disposed below the lower frame portion 2c. The lower frame portion 2 c supports the engine 3 and the radiator 5. The pivot frame portion 2 d is disposed behind the engine 3 and supports the engine 3.

  The engine 3 outputs a driving force that rotationally drives the rear wheels. The engine 3 includes a cylinder block 11, a cylinder head 12 disposed above the cylinder block 11, and a head cover 13 disposed above the cylinder head 12. A cartridge type oil filter unit 19 that is exposed to the outside of the engine 3 and filters the oil sucked up by the oil pump 10 is attached to the front side of the cylinder block 11. A throttle body 14 is connected to the rear side of the cylinder head 12. Inside the cylinder block 11, a crankshaft 15 extending in the vehicle width direction and a cylinder 16 extending in the vertical direction are accommodated.

  Fuel injected by an injector attached to the throttle body 14 is taken into the combustion chamber of the engine 3 from the rear of the cylinder head 12 together with the outside air that has passed through the throttle body 14. The engine 3 generates a driving force by igniting a spark plug attached to the cylinder head 12 in the combustion chamber.

  The oil pan 4 is attached to the lower part of the engine 3 and stores oil. In the motorcycle 1, the mating surfaces 3a and 4a of the engine 3 and the oil pan 4 extend while inclining in an upward gradient from the front to the rear.

  The radiator 5 is disposed in front of the engine 3. Traveling wind passes through the radiator 5 in the front-rear direction. The radiator 5 circulates the cooling water that has cooled the engine 3 to exchange heat with the outside air, and then supplies the cooling water to the engine 3. A pair of front forks and a front wheel pivotally supported by the pair of front forks are disposed in front of the radiator 5. The fan 6 is disposed behind the radiator 5 and forcibly passes the wind through the radiator 5.

  The piping unit 7 circulates cooling water between the engine 3 and the radiator 5. The piping unit 7 includes a first piping 17 and a second piping 18. The first piping 17 is arranged on one side (here, the left side) of the engine 3 in the vehicle width direction, and the second piping 18 is arranged on the other side (here, the right side) of the engine 3 in the vehicle width direction. The cooling water cooled by the radiator 5 is sent to the engine 3 through the first pipe 17. The cooling water that has cooled the engine 3 is sent to the radiator 5 via the second pipe 18. In addition, you may arrange | position the 1st piping 17 and the 2nd piping 18 in right and left reverse.

  The exhaust pipe 8 is disposed below one side (right side in the present embodiment) of the engine 3 in the vehicle width direction. The upstream end of the exhaust pipe 8 is connected to the front side of the engine 3. The exhaust pipe 8 extends in the front-rear direction below the engine 3 and distributes exhaust gas discharged from the engine 3 toward the muffler.

  The drain bolt 9 is screwed to the oil pan 4 so as to be detachable and detached from the oil pan 4, thereby discharging the oil inside the oil pan 4 to the outside of the oil pan 4. As an example, the drain bolt 9 is detachably screwed to the other side (the left side in the present embodiment) of the oil pan 4 in the vehicle width direction.

  The oil pump 10 sucks up oil from the inside of the oil pan 4 and supplies it to the inside of the engine 3. The oil pump 10 is provided inside the cylinder block 11 and is driven by the driving force of the engine 3.

  The side stand 20 is attached to the lower part of the pivot frame portion 2d on the other side (left side in the present embodiment) in the vehicle width direction of the motorcycle 1. When the motorcycle 1 is parked, the motorcycle 1 is tilted to the other side in the vehicle width direction while being supported by the side stand 20.

  Here, in the state where the motorcycle 1 is supported by the side stand 20, the oil pan 4 is inclined from the one side toward the other side (see FIG. 6), so that the oil is directed from the one side toward the other side. To move inside the oil pan 4. For this reason, when the motorcycle 1 is supported by the side stand 20, the drain bolt 9 screwed to the other side in the vehicle width direction of the oil pan 4 is removed from the oil pan 4, so that the oil It is easy to be discharged from the inside. The side stand 20 may be attached to a vehicle body part other than the pivot frame part 2d.

  FIG. 2 is a perspective view of the oil pan 4 of FIG. As shown in FIG. 2, the oil pan 4 has a storage part 4b, a partition wall part 4c, an opening part 4d, and a drain hole 4e.

  The reservoir 4b has an internal space 22 in which oil that has passed through the engine 3 is stored. The storage part 4b has the bottom part 4g and the surrounding wall part 4h as an example. The bottom portion 4g extends in the front-rear direction and the vehicle width direction at the lower portion of the oil pan 4. The peripheral wall portion 4h is provided on the periphery of the bottom portion 4g and extends in the up-down direction. The upper end of the peripheral wall portion 4 h is attached to the lower end of the cylinder block 11. A plurality of insertion holes through which a plurality of bolts for attaching the oil pan 4 to the cylinder block 11 are inserted at the upper end of the peripheral wall portion 4h. Note that the bottom portion 4g may not extend in the front-rear direction or the vehicle width direction, and may extend in the up-down direction, for example.

  The partition wall portion 4c extends in the vehicle width direction inside the internal space 22, is connected to both sides of the storage portion 4b in the vehicle width direction, and partitions the internal space 22 in the front-rear direction. The partition wall 4c has a pair of flat wall surfaces extending in the vertical direction and the vehicle width direction. The partition wall 4c suppresses the oil in the oil pan 4 from shaking in the front-rear direction when the motorcycle 1 is traveling.

  In this embodiment, although the height position of the upper end of the partition wall part 4c is constant, the height position of the upper end of the partition wall part 4c may differ in the some position of the upper end of the partition wall part 4c. Moreover, in this embodiment, the volume of the back space 22b located in the back of the partition wall part 4c among the internal spaces 22 is larger than the volume of the front space 22a located in the front of the partition wall part 4c in the internal space 22. Although large, the volume of the rear space 22c may be smaller than the volume of the front space 22a.

  4 d of opening parts are formed below the upper end of the partition wall part 4c, and distribute | circulate oil in the front-back direction. For example, the opening periphery of the opening portion 4d has a shape in which the dimension in the vertical direction is smaller than the dimension in the vehicle width direction when viewed in the front-rear direction. In the present embodiment, the opening periphery of the opening portion 4d has a rectangular shape when viewed in the front-rear direction, but is not limited thereto, and may be any one of a square shape, a circular shape, and an elliptical shape as viewed in the front-rear direction. May be.

  The position of the upper end of the opening periphery of the opening portion 4d is preferably located below the center in the vertical direction of the partition wall 4c, and the vertical dimension of the partition wall 4c from the upper end of the partition wall 4c. It is further desirable that the distance is lower than the distance corresponding to 2/3 of the distance, and the distance from the upper end of the partition wall 4c is lower than the distance corresponding to 3/4 of the vertical dimension of the partition wall 4c. It is even more desirable.

  The drain hole 4e communicates with the opening portion 4d. A female screw portion 4f into which the drain bolt 9 is screwed is provided on the inner peripheral surface of the drain hole 4e and the upper and lower sides of the opening periphery of the opening portion 4d. For example, the drain hole 4 e extends in the vehicle width direction at the lower portion of the oil pan 4 and communicates with the outside of the oil pan 4 on the other side of the oil pan 4 in the vehicle width direction. When viewed from one direction perpendicular to the thickness direction of the partition wall portion 4c, at least a part of the drain hole 4e is disposed at a position overlapping the partition wall portion 4c of the oil pan 4 (see FIG. 3). Moreover, the drain hole 4e is extended in the direction where the wall surface of the partition wall part 4c is extended seeing from the said one direction. The drain hole 4e extends in the direction in which the bottom portion 4g extends. A part of the inner peripheral surface of the drain hole 4e (in this embodiment, the lower side of the inner peripheral surface of the drain hole 4e) is formed by the bottom portion 4g of the storage portion 4b.

  The oil pan 4 further includes a first region 4j and a second region 4k. The first region 4j extends in the front-rear direction on the other side of the engine 3 in the vehicle width direction. The partition wall 4c is provided in the first region 4j. The second region 4k extends from the rear side of the first region 4j to the one side of the engine 3 in the vehicle width direction.

  The first region 4j is provided with a plurality of protruding portions 4i with which a plurality of contact portions (see contact portions 27d and 27e in FIG. 4) of the oil guide member 26 contact. A piping portion 25 extending in the up-down direction is provided on the rear side of the first region 4j. An oil level gauge is inserted into the piping part 25.

  The drain bolt 9 has a head portion 9a, a seat portion 9b, a male screw portion 9c, and a tip portion 9d. For example, the head 9a is formed in a substantially hexagonal column shape that can be engaged with a tool such as a spanner. The seat portion 9b is adjacent to the head portion 9a and is formed in a disc shape. The male screw portion 9c is provided inside the drain bolt 9 in the axial direction and extends in the axial direction. The tip 9d is provided on the opposite side of the drain bolt 9 from the head 9a in the axial direction.

  The drain bolt 9 is attached to the oil pan 4 by screwing the male screw portion 9c with the female screw portion 4f until the seat portion 9b contacts the outer surface of the oil pan 4. When the drain bolt 9 is attached to the oil pan 4, the head portion 9 a and the seat portion 9 b are exposed to the outside of the oil pan 4 on the other side in the vehicle width direction of the first region 4 j of the oil pan 4. ing.

  In a state where the drain bolt 9 is screwed into the female screw portion 4f, the tip end portion 9d of the drain bolt 9 inserted into the drain hole 4e protrudes from the drain hole 4e into the opening portion 4d. The leading end portion 9d of the drain bolt 9 protrudes from the drain hole 4e into the opening portion 4d, so that the leading end portion 9d of the drain bolt 9 and the opening portion 4d overlap each other when viewed in the front-rear direction. As a result, the opening area S of the opening portion 4d in a state where the drain bolt 9 is screwed to the female screw portion 4f is smaller than the opening area S in a state where the drain bolt 9 is detached from the female screw portion 4f.

  In the present embodiment, when the drain bolt 9 is screwed into the female screw portion 4f, the dimension in the vehicle width direction of the opening area S of the opening portion 4d is the opening in the state where the drain bolt 9 is detached from the female screw portion 4f. The area S is smaller than the dimension in the vehicle width direction. In this way, by engaging the male screw portion 9c of the drain bolt 9 with the female screw portion 4f, a part of the opening portion 4d is closed by the male screw portion 9c and the tip end portion 9d of the drain bolt 9. The dimension in the vehicle width direction of the opening area S in a state where the drain bolt 9 is detached from the female screw part 4f can be adjusted by replacing the drain bolt 9 having a different length dimension of the tip end part 9d.

  A seal member (not shown) is provided at the upper end of the peripheral wall portion 4h of the mating surface 4a of the oil pan 4 to improve airtightness between the mating surface 3a of the engine 3 and the mating surface 4a of the oil pan 4. Yes.

  FIG. 3 is a vertical cross-sectional view perpendicular to the vehicle width direction as viewed from the left front of the oil pan 4 of FIG. 4 is a vertical cross-sectional view perpendicular to the vehicle width direction as seen from the left side of the oil pan 4 in FIG. 1 in the vehicle width direction. FIG. 4 shows a vertical cross section of the oil guide member 26. In FIG. 4, the position of the drain hole 4e inside the opening 4d is indicated by a broken line.

  As shown in FIGS. 3 and 4, when the motorcycle 1 is traveling, the bottom portion 4 g in the first region 4 j of the storage portion 4 b extends substantially parallel to the road surface in a side view of the motorcycle 1.

  The partition wall portion 4c and the front side and the rear side of the peripheral wall portion 4h extend substantially in parallel while being inclined forward from below to above. The thickness dimension of the partition wall 4c decreases from the lower side toward the upper side. For this reason, when manufacturing the oil pan 4 using a metal mold | die, it is easy to shape | mold the storage part 4b and the partition wall part 4c integrally, and it is easy to pull out a metal mold | die above the oil pan 4 from the internal space 22. It has become.

  The bottom portion 4g of the storage portion 4b in the first region 4j is inclined in a downward gradient from the front to the rear in front of the opening portion 4d, and is inclined in an upward gradient from the front to the rear in the rear of the opening portion 4d. doing. Thus, in the first region 4j, oil is likely to collect in the opening portion 4d in the front-rear direction, and the oil is easily discharged from the drain hole 4e to the outside of the oil pan 4.

  Here, the motorcycle 1 further includes a suction port 27a and a filter 28 that is attached to the suction port 27a and filters oil sucked from the suction port 27a. Specifically, the motorcycle 1 includes an oil guide member 26 disposed inside the engine 3 and the oil pan 4. The oil guide member 26 includes a pipe member 27 and a filter 28, and guides oil from the internal space 22 of the oil pan 4 toward the oil pump 10 when the oil pump 10 is driven.

  The pipe member 27 extends in the vertical direction. A suction port 27 a is provided in the lower part of the tube member 27, and a discharge port 27 b is provided in the upper part of the tube member 27. The suction port 27 a is disposed inside the internal space 22. The suction port 27a is disposed behind the partition wall portion 4c and below the upper end of the partition wall portion 4c inside the oil pan 4, and sucks up oil.

  The discharge port 27 b is disposed inside the cylinder block 11. The filter 28 is attached to the suction port 27a and filters the oil sucked up from the suction port 27a. The filter 28 is a metal mesh in the present embodiment, but is not limited thereto.

  A plurality of abutting portions 27c to 27f that abut against the oil pan 4 are provided below the pipe member 27 so as to surround the suction port 27a. The contact portion 27c is in contact with the rear wall surface of the partition wall portion 4c. The contact portions 27d and 27e are in contact with the protruding portion 4i of the bottom portion 4g. The contact portion 27f is in contact with the wall surface of the peripheral wall portion 4h on the left side in the vehicle width direction. When the contact portions 27 c to 27 f are in contact with the oil pan 4, the oil guide member 26 is positioned in the internal space 22 of the oil pan 4.

  FIG. 5 is a bottom view of the engine 3 and the oil pan 4 of FIG. FIG. 5 shows the outline of the engine 3 as viewed from below. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 6 shows a vertical cross section perpendicular to the front-rear direction of the oil pan 4, the exhaust pipe 8, and the oil guide member 26 in a state where the motorcycle 1 is supported by the side stand 20.

  As shown in FIGS. 5 and 6, the exhaust pipe 8 extends in the front-rear direction immediately below the second region 4 k of the oil pan 4. The height position of the lower surface (bottom surface) of the second region 4k of the oil pan 4 is higher than the height position of the lower surface (bottom surface) of the first region 4j. The second region 4k is connected to the first region 4j while inclining downward from the one side in the vehicle width direction of the engine 3 toward the other side in a cross section perpendicular to the front-rear direction.

  In a state where the motorcycle 1 is supported by the side stand 20, the bottom portion 4g of the storage portion 4b is inclined downward from the one side in the vehicle width direction toward the other side. Here, the bottom portion 4g of the storage portion 4b in the first region 4j is inclined downward from the front to the rear in front of the opening portion 4d, and rises from the front to the rear in the rear of the opening portion 4d. Since the oil is inclined in a gradient (see FIG. 4), the oil in the first region 4j and the second region 4k is likely to gather toward the opening of the drain hole 4e. Therefore, by removing the drain bolt 9 from the oil pan 4 while the motorcycle 1 is supported by the side stand 20, the oil can be removed from the drain hole 4 e while preventing the oil from remaining in the internal space 22. It can be discharged outside the pan 4.

  As described above, in the motorcycle 1, the partition wall portions 4c that extend in the vehicle width direction inside the internal space 22 and are connected to both sides of the storage portion 4b in the vehicle width direction extend the internal space 22 in the front-rear direction. Since it is partitioned, oil can be effectively prevented from being swayed in the front-rear direction when the motorcycle 1 is traveling inside the oil pan 4 by the partition wall portion 4c.

  Furthermore, in a state where the drain bolt 9 is screwed into the female screw portion 4f, the tip end portion 9d of the drain bolt 9 inserted into the drain hole 4e protrudes from the drain hole 4e into the opening portion 4d, whereby the drain bolt Since the tip 9d and the opening 4d overlap each other when viewed in the front-rear direction, the drain bolt 9 is removed from the drain hole 4e, so that the region of the opening 4d partitioned by the drain bolt 9 is removed. Oil can be collected. For this reason, when the motorcycle 1 is not running, the oil can be easily guided from the opening 4d toward the drain hole 4e when the drain bolt 9 is removed from the drain hole 4e and the oil is discharged. The oil can be prevented from remaining inside the oil pan 4, and the oil drainage efficiency from the oil pan 4 can be improved.

  Further, in the state where the drain bolt 9 is screwed into the female screw portion 4f, the dimension in the vehicle width direction of the opening area S of the opening portion 4d is the opening area S in the state where the drain bolt 9 is detached from the female screw portion 4f. Since the size is smaller than the dimension in the vehicle width direction, for example, by replacing the drain bolt 9 having a different length length of the tip portion 9d protruding from the drain hole 4e into the opening portion 4d, the peripheral edge of the opening portion 4d is opened. The size of the opening area S of the opening portion 4d in the vehicle width direction can be changed while the position of the upper end of the opening 4d is maintained, and the amount of oil flowing through the opening portion 4d can be easily changed. Therefore, even if the dimension of the opening area S in the vehicle width direction changes, the oil is prevented from shaking in the front-rear direction in the oil pan 4 by the partition wall portion 4c, and the oil is stably discharged from the drain hole 4e. Easy to do.

  Moreover, since at least a part of the drain hole 4e is disposed at a position overlapping the partition wall 4c of the oil pan 4 when viewed from the one direction, the oil sways in the front-rear direction inside the oil pan 4. Can be suppressed by the partition wall portion 4c, and the oil can be guided to the drain hole 4e along the wall surface of the partition wall portion 4c, and the oil can be easily discharged efficiently from the drain hole 4e.

  Further, as viewed from the one direction, at least a part of the drain hole 4e is disposed at a position overlapping the partition wall portion 4c of the oil pan 4, and extends in the extending direction of the wall surface of the partition wall portion 4c. The opening 4d and the drain hole 4e can be easily formed in the oil pan 4, and the space efficiency for arranging the drain bolt 9 can be improved.

  Further, a part of the inner peripheral surface of the drain hole 4e is formed by the bottom part 4g of the storage part 4b, and the drain hole 4e extends in the extending direction of the bottom part 4g of the storage part 4b. The oil can be easily guided to the drain hole 4e, and the oil discharge efficiency can be further increased.

  In addition, since the filter 28 is attached to the suction port 27a of the oil pump 10 disposed behind the partition wall 4c and below the upper end of the partition wall 4c inside the oil pan 4, the oil pan In addition to improving the efficiency of oil discharge from the oil, the oil whose vibration in the front-rear direction is suppressed by the partition wall 4c is sucked up by the oil pump 10 through the filter 28 and can be easily supplied stably to the inside of the engine 3. .

  In addition, since the volume of the rear space 22b is larger than the volume of the front space 22a, the suction port 27a of the oil guide member 26 can be disposed well in the rear space 22b, and abundant oil can be stored in the rear space 22b. Therefore, local uneven distribution of oil can be easily prevented in the rear space 22b, and the supply efficiency of oil into the engine 3 can be further prevented from decreasing.

  Further, since the partition wall portion 4c is provided in the first region 4j of the oil pan 4, the partition wall portion 4c can prevent the oil from shaking in the front-rear direction during traveling inside the first region 4j. The local uneven distribution of oil inside the one region 4j can be prevented by the opening 4d.

  Further, since the mating surfaces 3a, 4a extend from the front to the rear in an inclined manner and the exhaust pipe 8 extends in the front-rear direction immediately below the second region 4k of the oil pan, The lower part of the engine 3 can be widely covered with the first region 4j and the second region 4k of the oil pan 4 while improving the arrangement efficiency with the oil pan 4. As a result, the oil can be prevented from shaking in the front-rear direction inside the oil pan 4 by the partition wall portion 4c, and the oil can be prevented from remaining inside the oil pan 4 by the opening portion 4d. Oil can be recovered well by the oil pan 4.

  In the state where the motorcycle 1 is supported by the side stand 20, the second region 4k extends from the one side (right side) in the vehicle width direction of the engine 3 to the other side (left side) in a cross section perpendicular to the front-rear direction. Therefore, the oil swaying forward and backward in the oil pan 4 can be suppressed by the partition wall portion 4c, and the oil remains in the oil pan 4. Can be prevented by the opening 4d, and the oil that has moved from the engine 3 to the second region 4k can be smoothly guided toward the first region 4j.

  The present invention is not limited to the above embodiment, and the configuration can be changed, added, or deleted without departing from the spirit of the present invention. Of course, the vehicle of the present invention is not limited to a motorcycle, and other various vehicles such as a tricycle, a personal watercraft (PWC), a snowmobile, and an ATV (all-terrain vehicle). Either of them may be used.

S Open area 1 Motorcycle (vehicle)
DESCRIPTION OF SYMBOLS 3 Engine 4 Oil pan 4b Storage part 4c Partition wall part 4d Open part 4e Drain hole 4f Female thread part 4g Bottom part 4j 1st area | region 4k 2nd area | region 8 Exhaust pipe 9 Drain bolt 10 Oil pump 22 Internal space 27a Suction port 28 Filter

Claims (8)

An engine for traveling,
An oil pan attached to the lower part of the engine and storing oil;
A drain bolt that is detachably screwed into the oil pan and is detached from the oil pan, thereby draining the oil inside the oil pan to the outside of the oil pan;
An oil pump that sucks up the oil from the inside of the oil pan and supplies the oil to the inside of the engine,
The oil pan has a storage portion having an internal space in which the oil is stored, and extends in the vehicle width direction inside the internal space, and is connected to both sides of the storage portion in the vehicle width direction, A partition wall portion partitioning in the front-rear direction, an opening portion formed below the upper end of the partition wall portion, through which the oil flows in the front-rear direction, and the drain bolt on the inner peripheral surface communicating with the opening portion And a drain hole provided with a female screw part to be screwed,
In a state where the drain bolt is screwed into the female screw portion, a tip end portion of the drain bolt inserted into the drain hole protrudes from the drain hole to the inside of the opening portion. A vehicle in which a front end portion and the opening portion are arranged to overlap each other when viewed in the front-rear direction.   In the state where the drain bolt is screwed into the female screw portion, the dimension of the opening area of the opening portion in the vehicle width direction is the vehicle of the opening area in the state where the drain bolt is detached from the female screw portion. The vehicle according to claim 1, wherein the vehicle is smaller than a widthwise dimension.   The at least one part of the said drain hole is arrange | positioned in the position which overlaps with the said partition wall part of the said oil pan seeing from one direction perpendicular | vertical to the thickness direction of the said partition wall part. vehicle.   The vehicle according to claim 3, wherein the drain hole extends in a direction in which a wall surface of the partition wall extends as viewed from the one direction. A part of the inner peripheral surface of the drain hole is formed by a bottom portion of the reservoir,
The vehicle according to any one of claims 1 to 4, wherein the drain hole extends in a direction in which the bottom portion extends.   Inside the oil pan, behind the partition wall portion, below the upper end of the partition wall portion, a suction port for sucking up the oil, attached to the suction port, and sucked up from the suction port The vehicle according to claim 1, further comprising a filter that filters the oil to be produced. An exhaust pipe connected to the engine and disposed below one side of the engine in the vehicle width direction;
The mating surfaces of the engine and the oil pan extend from the front to the rear, inclining upward,
The oil pan extends from the rear side of the first region to the one side in the vehicle width direction of the engine from a first region extending in the front-rear direction on the other side of the engine in the vehicle width direction. A second region having a height position higher than a height position of a bottom surface of the first region,
The vehicle according to any one of claims 1 to 6, wherein the exhaust pipe extends in the front-rear direction immediately below the second region. The second region is connected to the first region while being inclined downwardly from the one side in the vehicle width direction of the engine toward the other side in a cross section perpendicular to the front-rear direction. Item 8. The vehicle according to item 7.

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