JP2008184989A - Engine and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce intermeshing sound of an oil pump gear, and the like at the time of starting drive by always maintaining movable members such as an oil pump in a lubricated state. <P>SOLUTION: The engine 10 storing an engine oil in the inside comprises an oil pump gear 70A to be operated by transmission of the driving force of the engine 10 in the inside, and an oil reservoir 100 for the movable members having an opening in the upper part, provided so as to cover a part of the oil pump gear 70A from below for storing a part of the engine oil for soaking a part of the oil pump gear 70A in the engine oil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine and a vehicle mounted on, for example, a motorcycle.

Conventionally, as an engine mounted on a motorcycle, there is one disclosed in Patent Document 1, for example. The engine disclosed in Patent Document 1 includes a crankcase at a lower portion thereof, and a crankshaft and a transmission are provided in the crankcase so as to be aligned in the front-rear direction of the vehicle body. The transmission includes two transmission shafts including a main shaft and a drive shaft. One of the plurality of transmission gears provided on the main shaft and the transmission gear provided on the drive shaft. This is a structure in which the gears are shifted by moving the gears in the axial direction and changing the meshing gears. An oil pan (oil storage chamber) for lubricating the oil pump, the gears and the like is provided at the lower part of the crankcase.
JP 2006-77650 A

  By the way, in Patent Document 1, an oil pan for lubricating the oil pump gear and the like is provided at the bottom of the crankcase at a distance downward from the oil pump gear, so that the lubricating oil in the oil pan can be removed when the engine is stopped. Oil level may not reach the oil pump. In this case, when the engine is started, there is a problem that the supply of the lubricating oil in the oil pan to the oil pump gear becomes insufficient, and the meshing sound of the oil pump gear is generated, causing noise. In particular, when the engine of a motorcycle is started with the vehicle body tilted at the side stand, the oil level of the lubricating oil in the oil pan is tilted, so that the oil level does not reach the oil pump gear further. Therefore, there is a problem that it is impossible to further supply lubricating oil to the oil pump gear, and the meshing sound of the oil pump gear increases.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an engine and a vehicle that can keep a movable member such as a gear in a lubricated state and reduce a meshing noise of the movable member when the engine is started. There is to do.

  In order to solve the above-described problems, an engine according to the present invention is an engine that accumulates lubricating oil therein, and includes a movable member that moves when the driving force of the engine is transmitted inside the engine, and an opening in the upper part. And an oil reservoir for a movable member that is provided so as to cover at least a part of the operating member from below, accumulates a part of the lubricating oil, and immerses the at least a part of the movable member in the lubricant. It is characterized by providing.

  According to the present invention, part of the lubricating oil can be received from the opening of the oil reservoir for the movable member and can be stored in the oil reservoir for the movable member. As a result, the movable member can be lubricated by the lubricant stored in the oil reservoir for the movable member when the engine is started, and the occurrence of gear meshing noise and the like can be prevented.

  In one aspect of the present invention, the movable member oil sump includes a bottom wall portion that covers the curved portion of the movable member from below, and left and right sidewall portions that sandwich the movable member from both left and right sides. According to this aspect, the movable member can be accommodated in the space surrounded by the bottom wall portion and the left and right side wall portions of the movable member oil reservoir, and the gear and the like can be reliably lubricated by the movable member oil reservoir. Can be kept in a state.

  Moreover, in this aspect, one side wall part and the bottom wall part may be integrally formed among the left and right side wall parts. According to this aspect, the number of parts of the oil reservoir for the movable member can be reduced.

  In this aspect, the oil reservoir for the movable member may be disposed at a position on the opposite side to the side stand side in the left-right direction of the vehicle. According to this aspect, even if the oil surface of the lubricating oil is inclined obliquely and the lubricating oil does not reach the movable member because the vehicle stands diagonally by the side stand, the movable member is placed in the movable member oil sump. Can be immersed in the lubricant.

  In this aspect, a seal member is disposed between at least one of the left side wall and the bottom wall and the right side wall and the bottom wall. Also good. According to this aspect, it is possible to prevent the lubricating oil from leaking between the left side wall portion and the bottom wall portion or between the right side wall portion and the bottom wall portion.

  In one embodiment of the present invention, the movable member is an oil pump gear. According to this aspect, the oil pump gear can be kept in a lubrication state by the lubricating oil.

  In order to solve the above problems, a vehicle according to the present invention is equipped with the engine. According to the present invention, it is possible to reduce noise when starting the engine.

  According to the engine of the present invention, the movable member can be held in a lubrication state by the lubricating oil in the oil reservoir for the movable member. For example, even when the two-wheeled vehicle is in a side stand state, The meshing sound of the movable member can be reduced.

  A case where the engine according to the embodiment of the present invention is applied to a two-wheeled vehicle will be described as an example with reference to FIGS. 1 to 6.

  As shown in FIG. 1, a two-wheeled vehicle 1 according to an embodiment of the present invention includes an engine 10, left and right main frames 11 (only one shown), front wheels 14, and rear wheels 16. The front wheel 14 is attached to a front fork 13 (only one is shown) provided on the left and right sides so as to be swingable up and down and steerable. The rear wheel 16 is attached to the swing arm 15 so as to be swingable up and down.

  A fuel tank 17 is mounted on the upper side of the main frame 11, and a seat 6 is disposed on the rear side of the fuel tank 17. Below the seat 6, a frame and a stay (both not shown) are provided that extend obliquely upward from the rear end side of the main frame 11 to the rear. These frames and stays are covered with an exterior cover 19 or the like.

  Next, the engine 10 used in the present embodiment will be described with reference to FIGS.

  The engine 10 includes a crankcase 20, an engine cover 23 attached to the side wall of the crankcase 20, and a cylinder body 18 (see FIG. 1) provided on the upper side of the crankcase 20. As shown in FIGS. 3 and 4, the crankcase 20 has a side wall 21 and a flange portion 22 erected on the periphery of the side wall 21, and an engine cover 23 is connected to the flange portion 22 via a plurality of bolts 2 and the like. (See FIG. 2). As shown in FIG. 2, an engine oil injection port 3 is provided at the lower portion of the engine cover 23. A sealing plug 3A is detachably attached to the opening of the engine oil inlet 3. In addition, an oil pan 20A for storing engine oil, which is lubricating oil, is provided at the bottom of the crankcase 20 as shown in FIGS. The crankcase 20 houses a crankshaft 30, a main shaft 40, a drive shaft 50, a balancer shaft 60, an oil pump shaft 70, and the like. As shown in FIG. 1, a starter motor 150 for the engine 10 is provided on the upper part of the crankcase 20.

  As shown in FIGS. 3 to 5, the crankshaft 30 is rotatably supported by bearings 31, 31 provided on the side wall 21 at a position substantially at the center of the side wall 21 of the crankcase 20. A driving force generated by a piston (not shown) reciprocatingly moving in the cylinder 32 is transmitted to the crankshaft 30 via the connecting rod 33, so that the crankshaft 30 is rotationally driven. A large-diameter gear 30A and a small-diameter gear 30B are attached to the outer periphery of the crankshaft 30.

  The main shaft 40 is rotatably supported on the rear upper side of the side wall 21 of the crankcase 20. A large-diameter gear 40A and a small-diameter gear 40B are attached to the outer periphery of the main shaft 40. The main shaft 40 is rotationally driven by the driving force of the crankshaft 30 being transmitted when the large-diameter gear 40A meshes with the small-diameter gear 30B of the crankshaft 30.

  The drive shaft 50 is rotatably supported by the side wall 21 of the crankcase 20 at a position below the rear portion of the main shaft 40. A gear 50A is attached to the drive shaft 50, and the gear 50A meshes with a small-diameter gear 40B of the main shaft 40. As a result, the drive shaft 50 is rotated by the driving force transmitted from the main shaft 40, and this driving force is directly transmitted to the rear wheel 16.

  The balancer shaft 60 is rotatably supported on the front side of the side wall 21 of the crankcase 20. A gear 60A and a balancer weight (not shown) are attached to the balancer shaft 60. The balancer shaft 60 is configured such that the gear 60A meshes with the large-diameter gear 30A of the crankshaft 30, whereby the driving force of the crankshaft 30 is transmitted to the balancer shaft 60, and the balancer shaft 60 is rotationally driven.

  The oil pump shaft 70 is rotatably arranged on the lower side of the front portion of the side wall 21 of the crankcase 20. The oil pump shaft 70 is provided with a gear 70A, which is an oil pump gear, on the tip side. The gear 70A is a spur gear, is provided parallel to the traveling direction of the vehicle and parallel to the small diameter gear 30B of the crankshaft 30, and meshes with the small diameter gear 30B. The large-diameter gear 30A, the small-diameter gear 30B of the crankshaft 30, the large-diameter gear 40A of the main shaft 40, the small-diameter gear 40B, the gear 50A of the drive shaft 50, the gear 60A of the balancer shaft 60, the gear 70A of the oil pump shaft 70, and The rotation shaft of the starter motor 150 corresponds to a movable member referred to in the claims.

  As shown in FIG. 5, the oil pump 80 is provided integrally with a pair of casings 81, 82 that are integrally formed with the crankcase 20 and rotatably support the oil pump shaft 70, and the base end side of the oil pump shaft 70. The vane 83 is provided. The oil pump 80 rotates the oil pump shaft 70 so that the vane 83 accommodates the oil stored in the oil sump 100 described later to the large-diameter gear 30A, the small-diameter gear 30B, and the main shaft 40. The gears 40A, 40B, the gear 50A of the drive shaft 50, the gear 60A of the balancer shaft 60, and the gear 70A of the oil pump shaft 70 are scraped up and supplied to each movable member.

  As shown in FIGS. 5 and 6, the movable member oil sump (hereinafter simply referred to as an oil sump) 100 is a metal curved in an arc shape so as to cover the curved portion of the gear 70 </ b> A of the oil pump shaft 70 from below. It has a bottom wall portion 100A made of a plate and side wall portions 100B and 100C arranged so as to sandwich the gear 70A from both the left and right sides. The oil sump 100 is a dedicated oil sump for the gear 70A of the oil pump shaft 70, and is formed in a size corresponding to the gear 70A. The arc radius of the bottom wall portion 100A curved in an arc shape is slightly larger than the radius of the gear 70A made of a spur gear, and a small gap is provided between the gear 70A and the bottom wall portion 100A. ing. As shown in FIG. 5, the oil sump 100 has a side stand 110 side (with the center line L in between) with the center line L on the left and right sides of the two-wheeled vehicle 1 (a line extending in the front-rear direction through the center of the vehicle body) interposed therebetween. It is provided on the side opposite to the left side (right side across the center line L).

  As shown in FIG. 6, a plate-like attached portion 101 for attaching the right side wall portion 100C to the bottom wall portion 100A is provided at both front and rear portions located on the upper end side of the bottom wall portion 100A. A screw hole 101 </ b> A is formed in the attachment portion 101. Further, the left side wall portion 100 </ b> B is configured by a C-shaped metal plate and is formed so as to surround the outer peripheral surface of the oil pump shaft 70. The left side wall part 100B and the bottom wall part 100A are integrally formed, and the outer peripheral edge part of the side wall part 100B is connected to the left side edge part of the bottom wall part 100A curved in an arc shape. The left side wall portion 100B is attached to the side wall 21 of the crankcase 20 using three screws 101D and the like.

  The right side wall portion 100C is formed of a semicircular metal plate, and plate-like attachment portions 102, 102 projecting forward and rearward are provided on the upper portion thereof. And each attachment part 102,102 is fixed to screw hole 101A, 101A of to-be-attached part 101,101 with the screw 103,103, and, thereby, the right side wall part 100C is attached to bottom wall part 100A.

  In addition, a seal member (not shown) is provided between the right side wall portion 100C and the right edge portion of the bottom wall portion 100A for liquid-tight sealing between the two. And the oil sump 100 which consists of this bottom wall part 100A and side wall part 100B, 100C has the opening 100D opened upwards (refer FIG. 5). The oil sump 100 receives a part of the engine oil discharged from the oil pump 80 and scattered in the crankcase 20 from the opening 100D, and accumulates the oil in the oil sump 100. As a result, the gear 70 </ b> A of the oil pump shaft 70 is partially immersed in the engine oil accumulated in the oil sump 100.

  By the way, in the present embodiment, as shown in FIG. 5, when the vehicle body stands in a posture inclined to the left by the side stand 110 (hereinafter referred to as an inclined state), the oil level F of the engine oil is within the crankcase 20. The engine oil does not reach the gear 70 </ b> A of the oil pump shaft 70 by tilting obliquely. As a result, engine oil is not supplied to the gear 70A of the oil pump shaft 70. When the engine 10 is started in this state, a meshing sound is generated when the gear 70A of the oil pump shaft 70 and the small-diameter gear 30B of the crankshaft 30 are meshed, which causes noise.

  Therefore, in the present embodiment, the engine 10 has an oil sump 100 that partially covers the gear 70A of the oil pump shaft 70 from the lower side and the left and right sides inside the crankcase 20. Thus, even when the engine 10 is started with the vehicle tilted, the gear 70A can be maintained in a lubricated state by the engine oil in the oil sump 100, and the meshing when the gear 70A meshes with the small-diameter gear 30B of the crankshaft 30. Generation of noise can be prevented, and noise at engine start can be reduced.

  The present invention is not limited to the oil sump 100 described above, and various modifications can be made. For example, in the above description, the oil sump 100 is composed of the bottom wall portion 100A made of a metal plate and the left and right side wall portions 100B and 100C. However, the bottom wall and the left side wall may be formed integrally with the side wall 21 of the crankcase 20. FIG. 7 is a diagram showing an example of an oil sump in this case. As shown in FIG. 7, the oil sump 200 includes an arc-shaped bottom wall portion 200 </ b> A integrally formed on the side wall 21 of the crankcase 20, a side wall portion 200 </ b> B integrally provided on the side wall 21, and a bottom wall portion 200 </ b> A. It is comprised by the cover part 200D fastened with the volt | bolt 201. FIG. 200 A of bottom wall parts are provided so that it may protrude from the side wall 21 to the side (direction shown to C in the same figure), and the lower side of gear 70A may be enclosed. FIG. 7 shows a cross section of the arc-shaped bottom wall portion 200A.

  In the above description, the oil sump 100 is provided in the oil pump 80. However, the oil sump 100 includes, for example, the large diameter gear 30A and the small diameter gear 30B of the crankshaft 30, the large diameter gear 40A and the small diameter gear 40B of the main shaft 40, the gear 50A of the drive shaft 50, the gear 60A of the balancer shaft 60, and the starter. You may provide in movable members, such as the rotating shaft of the motor 150. FIG.

  In addition, when the chain is wound around the main shaft and the crankshaft, the driving force of the crankshaft is transmitted to the main shaft, and when a tensioner for applying tension to this chain is provided, the chain is in contact with the tensioner. An oil sump may be provided in the portion that is present.

  Further, when a tensioner is provided in the chain that transmits the driving force of the crankshaft to the camshaft, an oil sump may be provided in a portion of the chain that is in contact with the tensioner. FIG. 8 is a diagram showing an example of an oil sump in this case. In the figure, the same reference numerals are given to the same portions as described above.

  As shown in the figure, the engine 10 a has a crankcase 20, a cylinder body 18, and a cylinder head 19. In this example, the cylinder body 18 is provided substantially horizontally so that a piston (not shown) moves in the front-rear direction of the vehicle (the direction indicated by A in the figure). A cam shaft 90 is disposed inside the cylinder head 19. A cam 90 </ b> B that operates an intake valve (not shown) or an exhaust valve (not shown) and a gear 90 </ b> A that rotates integrally with the cam shaft 90 are fastened to the outer periphery of the cam shaft 90. A gear 30 </ b> C that rotates integrally with the crankshaft 30 is fastened to the outer periphery of the crankshaft 30. A chain 130 is wound around the gear 30C and the gear 90A, and the driving force of the crankshaft 30 is transmitted to the camshaft 90 via the gear 30C, the chain 130, and the gear 90A. The chain 130 is in contact with a tensioner 120 that applies tension by pushing the chain 130 inward. The tensioner 120 is provided with an adjuster 121 that adjusts the position of the tensioner 120 with respect to the chain 130 and adjusts the tension applied to the chain 130 by the tensioner 120.

  In this example, an oil sump 300 is provided so as to surround the portion of the chain 130 that contacts the tensioner 120 from below. The oil sump 300 has a shape corresponding to the portion of the chain 130 that contacts the tensioner 120, and a slight gap is provided between the oil sump 300 and the chain 130. Also in this example, the oil sump 300 is opened upward, receives engine oil scattered in the engine 10a from the opening, and accumulates engine oil therein. As a result, the portion of the chain 130 that contacts the tensioner 120 is immersed in the engine oil even when the engine 10a is started. The oil sump 300 is fixed to the wall portion of the cylinder body 18 with, for example, bolts.

  An oil sump may be provided on the gear 30C around which the chain 130 of the crankshaft 30 is wound. FIG. 9 is a diagram showing an oil sump in this case. In the figure, the same parts as those shown in FIG. In the engine 10b shown in FIG. 9, the cylinder body 18 is tilted forward (the direction indicated by A in the figure) so that the piston (not shown) moves obliquely in the vertical direction (the direction indicated by B in the figure). It is arranged in a different posture. The engine 10b has an oil sump 400, and the oil sump 400 is provided so as to surround the gear 30C from below. The oil sump 400 has a shape corresponding to the size of the gear 30C, and a slight gap is provided between the oil sump 400, the chain 130, and the gear 30C. Also in this example, the oil sump 400 opens upward, receives engine oil scattered in the engine 10b from the opening, and accumulates engine oil inside. Thus, the gear 30C is immersed in the engine oil even when the engine 10b is started. The oil sump 400 is fixed to the side wall of the crankcase 20 with, for example, bolts.

1 is an overall view of a motorcycle on which an engine according to an embodiment of the present invention is mounted. It is an enlarged view which shows the engine in FIG. 1 alone. FIG. 3 is an enlarged view showing a state where an engine cover and a right side wall portion of a movable member oil sump are removed from the engine in FIG. 2. FIG. 4 is an enlarged view showing a state where a right side wall portion of a movable member oil sump is attached to the engine in FIG. 3. It is sectional drawing seen from the arrow VV direction in FIG. It is a disassembled perspective view which expands and shows the oil sump for movable members in FIG. It is an expanded sectional view of the oil sump for movable members by other embodiments of the present invention. It is a figure which shows the example of the oil sump provided in the contact part of a chain and a tensioner. It is a figure which shows the example of the oil sump provided in the gearwheel by which a chain is wound.

Explanation of symbols

  1 motorcycle, 10 engine, 20 crankcase, 23 engine cover, 30 crankshaft, 30A large diameter gear (movable member), 30B small diameter gear (movable member), 40 main shaft, 40A large diameter gear (movable member), 40B Small gear (movable member), 50 drive shaft, 50A gear (movable member), 60 balancer shaft, 70 oil pump shaft, 70A gear (movable member), 100, 200, 300, 400 Oil reservoir (oil reservoir for movable member) , 100A Bottom wall part, 100B Left side wall part, 100C Right side wall part, 100D Opening part, 150 Starter motor (movable member).

Claims (7)

An engine that stores lubricating oil inside,
A movable member that moves when the driving force of the engine is transmitted inside the engine;
For a movable member provided with an opening at the top and covering at least a part of the operating member from below, storing a part of the lubricating oil and immersing the at least a part of the movable member in the lubricating oil Oil sump,
An engine comprising: The engine according to claim 1,
The oil reservoir for the movable member includes a bottom wall portion that covers a curved portion of the movable member from below, and left and right sidewall portions that sandwich the movable member from both left and right sides,
An engine comprising: The engine according to claim 2,
Of the left and right side wall portions, one side wall portion and the bottom wall portion are integrally formed.
An engine characterized by that. The engine according to claim 2,
The oil reservoir for the movable member is disposed at a position opposite to the side stand side in the left-right direction of the vehicle.
An engine characterized by that. The engine according to claim 2,
A seal member is disposed between at least one of the left side wall and the bottom wall and between the right side wall and the bottom wall.
An engine characterized by that. The engine according to claim 1,
The movable member is an oil pump gear;
An engine characterized by that.   A vehicle equipped with the engine according to claim 1.

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