JP2007009947A - Transmission lubricating device of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure of an oil supply passage of a cassette type transmission of an engine and facilitate assembly work and piping work of a transmission assembly body. <P>SOLUTION: The transmission assembly body M for supporting one end sides of an input shaft 14 and an output shaft 15 on a shaft supporting member 13 is detachably stored in a transmission chamber 11, and the other end sides of each shaft 14, 15 are supported on side walls 44, 48 of the transmission chamber 11. A first oil supply passage 104 having an oil inlet 105 communicating with a main gallery 92, a first oil taking-out port 106 communicating with an oil hole 110 of the input shaft 14, and a second oil taking-out port 107 communicating with an oil communicating pipe 115 extending from the side wall 48 onto a shaft supporting member 13 side is provided on the side wall 48. A second oil supply passage 120 having an end connection 120a communicating with an oil hole 122 of the output shaft 15 and connected with the oil communicating pipe 115 is provided in the shaft supporting member 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine mission lubrication device, and in particular, constitutes a mission assembly by supporting one end side of a plurality of transmission shafts on a shaft support member separate from a crankcase. The present invention relates to a lubrication device for a cassette type (or cartridge type) mission in which a unit is detachably housed in a mission chamber and the other end of each transmission shaft is supported on a side wall of the mission chamber.

  The lubrication structure of an engine transmission (transmission gear mechanism) generally has an oil hole extending in the axial direction in a transmission shaft such as an input shaft or an output shaft, and from the oil hole to a fitting portion of each transmission gear. A vertical oil hole extending in the radial direction is formed, and the oil hole in each shaft communicates with the main gallery or directly through an oil pump through an oil supply passage formed in the side wall of the mission chamber. .

  14 and 15 show an example of an engine equipped with a conventional cassette type transmission (Patent Document 1). An input for shifting is input to a mission cover (shaft support member) 302 which is a member different from the crankcase 301. FIG. A mission assembly M is configured by supporting a plurality of shafts such as the shaft 303 and the output shaft 304 in a cantilever manner, and the mission assembly M is inserted into the mission chamber 310 in the axial direction as a unit. The mission cover 302 is attached to the opening end face of the mission chamber 310, and the tip portions of the shafts 303 and 304 are fitted and supported on the side walls of the mission chamber 310.

  The oil pump 312 is disposed, for example, at the rear lower end of the mission chamber 310 as shown in FIG. 15, and the oil pumped from the oil pump 312 passes through the oil supply passage 315 and the side wall of the mission chamber 310 in FIG. Alternatively, the oil passes through the oil supply passage in the rear wall or the wall of the mission cover 302, and is supplied to the oil holes 320 and 321 formed in the input shaft 303 and the output shaft 304, and the transmission gear is It is supplied to each fitting part.

  A clutch 322 for connecting / disconnecting power from the crankshaft 331 is attached to the end of the input shaft 303, and an output sprocket 323 for transmitting power to wheels or the like is fixed to the end of the output shaft 304, for example. However, the clutch 322 and the output sprocket 323 are arranged separately at both ends in the axial direction in order to maintain the compactness of the entire mission.

The oil inlet 320a of the oil hole 320 of the input shaft 303 is provided on the side opposite to the arrangement side of the clutch 322 (the left end portion in the figure) and communicates with an oil supply passage 330 formed on the side wall of the mission chamber 310. The oil inlet 321a of the oil hole 321 of the output shaft 304 is provided on the side opposite to the side where the output sprocket 323 is disposed, and communicates with an oil supply passage (not shown) formed in the mission cover 302. In this way, the oil inlets 320a and 321a of the shafts 303 and 304 are formed at positions avoiding equipment such as the clutch 322 and the output sprocket 323, so that the connection structure at the oil inlets 320a and 321a is simple and compact. As well as ensuring sealing performance.
JP-A-1-169171

  In the conventional mission lubrication apparatus, the oil supply passage formed between the oil supply passage 315 and the oil holes 320 and 321 in FIG. Although it is described that the oil holes 320 and 321 communicate with each other through a passage, a specific route is not described, and generally, the crankshaft 331 is formed in the bottom wall or the rear wall of the crankcase 301. A branch passage that branches in parallel with the oil passage, one of the branch passages communicates with an oil supply passage formed on the side wall of the mission chamber 310, and the other branch passage is an oil supply passage formed within the wall of the mission cover 302. Communicate.

  However, in the structure in which each branch passage communicates with each oil supply passage formed in the side wall of the mission chamber 310 and the wall of the mission cover 302 after branching in the bottom wall and the rear wall of the crankcase 301, An oil supply passage extending from the branch passage to the input shaft 303 and the output shaft 304 must be formed in the side wall of the chamber 310 and the wall of the mission cover 302, respectively. In this case, compared to the side wall of the mission chamber 310, the mission cover 302 has a limited area that can be used to form the oil supply passage, and avoids the portion where the input shaft 303, the change drum, etc. are arranged, and the output shaft. The oil supply passage must be extended to 304, the shape of the oil supply passage in the mission cover 302 becomes complicated, and it takes time to manufacture.

  An object of the present invention is to simplify an oil supply passage formed in a shaft support member (corresponding to a mission cover) in which an oil supply passage is formed in a limited range in an engine lubrication apparatus having a cassette type mission. At the same time, by effectively utilizing the empty space of the mission assembly, the communication passage between the side wall of the mission chamber and the shaft support member is communicated to make the structure of the oil supply passage for mission lubrication compact, and the mission It is to be able to complete the entire oil supply passage for mission lubrication at the time of assembly of the assembly.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is such that a transmission assembly in which one end side of a plurality of transmission shafts is supported by a shaft support member separate from a crankcase is detachable in a transmission chamber. And the other end side of each transmission shaft is supported on the side wall of the transmission chamber, and an oil hole is formed in the shaft of each transmission shaft. A first oil supply passage for mission lubrication that communicates with the main gallery is provided, and the first oil supply passage is supported by the first oil outlet that communicates with the oil hole of one transmission shaft and the side wall. A second oil take-out port that communicates with an oil communication passage that extends to the member side, and the shaft support member is for transmission lubrication that communicates with an oil hole of a transmission shaft different from the one transmission shaft The second of Yl supply passage provided, the oil supply passage of the second has a possible connection port connected to the distal end of the oil communication passage portion.

  According to the above configuration, the mission assembly is assembled in the mission chamber, and at the same time, the first oil supply passage on the side wall and the second oil supply passage on the shaft support member are connected to complete the entire oil supply passage for mission lubrication. As a result, assembly of the mission and assembly of the entire oil supply passage for mission lubrication are facilitated.

  In addition, the first oil supply passage and the oil communication passage portion having a complicated structure are provided on the side wall of the mission chamber, while the shaft of the mission assembly in which the area for forming the oil supply passage and the like is limited as compared with the side wall. Since the support member is provided with the second oil supply passage having a simple structure, the oil supply passage in the mission assembly is not complicated, and the transmission assembly M can be easily manufactured. In particular, the location of the oil supply passage can be easily avoided from the support portion such as the change drum, and the space of the shaft support member can be used effectively.

  According to a second aspect of the present invention, in the engine mission lubrication apparatus according to the first aspect, a flow rate restricting portion such as a throttle is provided at the first oil outlet of the first oil supply passage.

  According to the above configuration, by providing the flow restriction part such as a throttle, it becomes possible to distribute the oil substantially evenly to the oil holes of the transmission shafts, resulting in insufficient oil supply at some lubrication points. There is nothing.

  According to a third aspect of the present invention, in the engine mission lubrication device according to the first or second aspect, the first oil supply passage provided in a side wall of the mission chamber is formed by a member separate from the side wall. In addition, it is detachably fixed to the side wall.

  According to the above configuration, the member constituting the first oil supply passage can be easily attached by retrofitting after the crankcase is cast, and when the member itself is cast and molded alone, The supply passage can be easily formed by casting, and the occurrence of casting defects can be prevented and the yield can be increased as compared with the case where the supply passage is integrally formed with the crankcase.

  According to a fourth aspect of the present invention, in the engine lubrication apparatus according to any one of the first to third aspects, the oil communication passage extending from the side wall of the mission chamber to the shaft support member is separate from the side wall. It is formed by a pipe member and is fixed to the side wall.

  According to the above configuration, the oil communication passage portion separate from the crankcase can be easily assembled by retrofitting after casting the crankcase, and the arrangement location can be selected as compared with the case of being integrally formed with the crankcase. The degree of freedom is increased, piping can be made by effectively using the empty space of the mission assembly, and the mission assembly can be made compact.

  The invention according to claim 5 is the engine lubrication measure according to any one of claims 1 to 4, wherein a change shaft is disposed at a lower end portion of the mission chamber, and a lower portion of the shaft support member of the mission assembly. In addition, it supports a change drum for change operation.

  According to the above configuration, the change mechanism can be made compact, and a space for forming an oil supply passage for mission lubrication can be easily secured above the shaft support member that avoids the change drum.

  According to a sixth aspect of the present invention, in the engine lubrication apparatus according to any one of the first to fifth aspects, the one speed change shaft is an input shaft, and an end portion of the input shaft on the shaft support member side And a transmission shaft different from the one transmission shaft is an output shaft, and an output sprocket is attached to an end of the output shaft on the side wall.

  According to the above configuration, the transmission assembly can be made compact, and equipment such as a clutch and an output sprocket can be arranged in a compact manner.

  According to the present invention, in a mission lubrication device for an engine having a cassette type mission assembly, the oil supply passage formed in the shaft support member in which the oil supply passage formation range is limited can be simplified, and the mission lubrication device can be used. The structure of the entire oil supply passage can be made compact, and the connecting portion of the oil supply passage can be connected simultaneously when the transmission assembly is assembled, so that the entire oil supply passage can be easily completed.

  1 to 13 show an example in which a transmission lubrication device according to the present invention is provided in a semi-dry sump type parallel two-cylinder engine for a motorcycle, and an embodiment of the present invention will be described based on these drawings.

[Crankcase shape]
FIG. 1 is a side view of the crankcase 1 shown with the clutch cover 88 (see FIG. 2) removed. For convenience of explanation, the side on which the cylinder 5 is disposed (vehicle traveling side) is referred to as the “front side of the crankcase 1. In the following description, the left and right direction (the axial direction of the crankshaft) when viewed from the rear, that is, when viewed from the rider, is referred to as the “left and right direction” of the crankcase 1.

  In FIG. 1, the crankcase 1 has an upper and lower split structure in which an upper crankcase member 2 and a lower crankcase member 3 are joined by a mating surface S, and a cylinder is formed on the upper surface of the front half of the upper crankcase member 2. Although not shown, a cylinder head and a head cover are sequentially fastened to the upper surface of the cylinder 5. The front half of the crankcase 1 is a crank chamber 10 that houses the crankshaft 7. A balancer shaft 8 is disposed at the front of the crank chamber 10, and a water pump 9 is disposed at the right end of the balancer shaft 8. Is provided.

  The latter half of the crankcase 1 is a mission chamber 11 that houses a cassette-type mission assembly M. The cassette-type mission assembly M is shifted to a shaft support member 13 that is separate from the crankcase 1. The input shaft 14 for transmission, the output shaft 15 for speed change, the change drum 16 and the shift fork support shaft 17 are supported, and the mission assembly M is inserted into the mission chamber 11 from the right side as a unit. The shaft support member 13 is detachably fixed to a transmission mounting wall 41 formed on each crankcase member 2 and 3 by bolts 43 (only a part is given a reference numeral). A drive sprocket 25 for driving the pump is attached to the right end portion of the input shaft 14 and a multi-plate friction clutch 18 indicated by an imaginary line is attached. A pump drive chain 27 is wound between the drive sprocket 25 and the sprocket 26 of the common pump shaft 24 disposed at the front lower end of the mission chamber 11, and the rotation of the input shaft 14 is rotated around the common pump shaft 24. To communicate.

  An oil pan mounting portion 20 that projects downward is formed integrally with the lower crankcase member 3 on the lower surface of the bottom wall of the lower crankcase member 3, and a lower end surface of the oil pan mounting portion 20 is inclined forward and downward. An oil pan mounting surface 20 a is formed, and an oil pan 23 is fastened to the oil pan mounting surface 20 a by a plurality of mounting bolts 22.

  FIG. 4 is a perspective view of the lower crankcase member 3 as viewed from the upper right rear side, and is applied to a parallel two-cylinder engine. Therefore, the crank chamber 10 is formed on the left side by a partition wall 29 formed at the center in the left-right direction. A crank portion (web, etc.) that is partitioned into a crank chamber (first crank chamber) 10L and a right crank chamber (second crank chamber) 10R, and is connected to the left and right crank chambers 10L, 10R to the pistons of each cylinder. Are stored. The upper and lower side walls 30L, 30R of the crank chamber 10 and the upper end surfaces of the intermediate partition walls 29 are respectively formed with halved bearing recesses 31 for supporting the crankshaft, and the left and right side walls 30L, 30R of the crank chamber 10 A halved bearing recess 32 for supporting the balancer shaft is formed in the front part. An oil supply hole 35 for crankshaft lubrication is opened at the lower end of each bearing recess 31 for supporting the crankshaft, and a fastening bolt insertion hole 36 is formed before and after each bearing recess 31. .

  A clutch chamber 12 is formed on the right side of the mission chamber 11 via the mission mounting wall 41. In order to use the lower portion of the mission chamber 11 and the lower portion of the clutch chamber 12 as an oil reservoir, A partition wall 40 a having a height corresponding to the mating surface S is formed between the crank chamber 10 and a partition wall 40 b lower than the mating surface S is formed between the clutch chamber 12 and the crank chamber 10. Yes. In addition, a communication hole 42 is formed at the lower end of the mission mounting wall 41 so as to allow oil to flow between the lower end of the mission chamber 11 and the lower end of the clutch chamber 12. The lower part of the mission chamber 11 can be used simultaneously as an oil reservoir.

  The left side wall 44 of the lower crankcase member 3 of the transmission chamber 11 is formed with a halved bearing recess 45 for supporting the output shaft, a support hole 46 for supporting the change drum, and a recess for the shift fork support shaft. 47 etc. are formed.

  The lower end portion of the partition wall 40a, that is, the front lower end portion of the mission chamber 11, returns from a feed oil pump 50 for pumping oil in the oil reservoir to each lubrication location, and a lubrication location such as a crankshaft. A scavenging pump (recovery oil pump) 51 for collecting the used oil in the oil reservoir is provided in parallel on the shaft core O5 of the common pump shaft 24.

[Crank chamber oil discharge structure]
FIG. 5 is a plan view of the lower crankcase member 3. A left oil discharge port 53 is formed in a substantially middle portion (generally the lowest portion) in the front-rear direction on the bottom surface of the left crank chamber 10L, and the bottom surface of the right crank chamber 10R. The right oil discharge port 54 is formed in the rear half portion (generally the lowest portion), so that the oil returning from the crankshaft portion to the bottom surfaces of the crank chambers 10L, 10R respectively flows into the left and right crank chambers 10L, 10R. The oil discharge ports 53 and 54 are independently discharged every time.

  An oil recovery passage 55 is formed on the lower surface of the bottom wall of the lower crankcase member 3 so as to extend rightward and rearward from the left oil discharge port 53 across the lower portion of the partition wall 29. The right end of the oil recovery passage 55 Is communicated with an oil recovery chamber communication space 56 formed below the right oil discharge port 54, and the space 56 communicates with an oil recovery chamber 60 described later.

[Shape of oil pan]
FIG. 7 is a perspective view of the oil pan 23 as viewed from the upper left front. The oil pan 23 is formed in a substantially right triangle shape when viewed in the crankshaft direction, that is, in a side view, and the upper end mating surface 23a Inclining downward, the bottom wall 23b is substantially horizontal. The oil recovery chamber 60 is formed in the oil pan 23 so as to be adjacent to the right side wall of the oil pan 23, and the remaining large space partitioned by the peripheral wall 61 of the oil recovery chamber 60 is oil oil. It is a reservoir / oil suction chamber 62.

  A circular placement surface 62a for placing a strainer (primary filter) 64 is formed on the bottom surface of the oil suction chamber 62, and an arc-shaped baffle wall 62b is erected on the front portion of the placement surface 62a. Has been.

  A strainer 65 made of a wire mesh is accommodated in the oil recovery chamber 60 and fixed to the upper end portion of the peripheral wall 61 of the oil recovery chamber 60 by a pressing plate 66 and bolts 67. The upper end alignment surface 61 a of the peripheral wall 61 is formed in the same plane as the upper end alignment surface 23 a of the outer peripheral wall of the oil pan 23.

  A recovery oil suction passage 69 having a lower end communicating with the lower end of the oil recovery chamber 60 is formed on the rear side of the oil recovery chamber 60, and an upper end mating surface 69 a of the recovery oil suction passage 69 is also formed in the oil pan 23. Are formed in the same plane as the mating face 23a.

[Shape inside the oil pan mounting part]
FIG. 6 shows an oil pan mounting portion 20 formed on the lower surface of the lower crankcase member 3. In the oil pan mounting portion 20, a suction portion 50 b of the oil pump 50 and a discharge portion 50 c of the oil pump 50 are arranged at the rear. And a suction part 51b of the scavenging pump 51 is formed, a space part 56 for communication with the oil recovery chamber is formed at the right end part, and the oil recovery passage 55 is formed from the left front end part to the space part 56. . In addition to this, a pair of front and rear connection ports 81 and 82 for connecting the mission lubrication oil supply pipe are formed, and an oil supply pipe 94 for mission lubrication is attached between the connection ports 81 and 82.

  The oil recovery passage 55 is made of a sheet metal fastened to the lower surface of the bottom wall of the lower crankcase member 3 with a lower end open, and a sheet metal fastened to the lower end surface of the passage formation groove 77 with a bolt 79. The bottom plate 78 is formed with a small diameter oil adjustment hole 84 communicating with the oil recovery passage 78 and the oil suction chamber 62 at the front end of the bottom plate 78.

[Feed oil pump and scavenging pump]
FIG. 11 is a cross-sectional development view (cross-sectional development view of XI-XI in FIG. 1) of the cassette type mission M, the oil pump 50, and the scavenging pump 51. The feed oil pump 50 and the oil recovery scavenging pump 51 are Both employ trochoid pumps. A cylindrical outer casing part 70 is formed at the lower end of the partition wall 40a of the lower crankcase member 3, and an intermediate casing member 71 is fitted into the outer casing part 70, and the right-side open end of the intermediate casing member 71 is By closing with the pump cover 72, the casing of the scavenging pump 51 is configured on the right side, and the casing of the oil pump 50 is configured on the left side.

[Cassette type mission assembly]
In FIG. 11, the left end portion of the input shaft 14 of the mission assembly M is supported by a penetrating support hole 108 formed in the left side wall 48 of the upper crankcase member 2 of the mission chamber 11 via a needle bearing 109. A bottomed cylindrical cap 113 having a restriction (flow restricting portion) 111 is fitted into the support hole 108. The right end portion of the input shaft 14 is supported by a penetrating support hole 117 formed in the shaft support member 13 via a ball bearing 118 and protrudes into the clutch chamber 12. The sprocket 25 and the clutch input gear 18a of the multi-plate friction clutch 18 are fitted, and a clutch housing 18b is fixed to the clutch input gear 18a. An oil hole 110 extending in the axial direction is formed in the shaft core O 2 of the input shaft 14, and the left end portion of the oil hole 110 communicates with an oil chamber 113 a formed by the cap 113. A plurality of vertical oil holes 110a extending in the radial direction and extending to the engagement portion of each drive-side transmission gear on the input shaft 14 and the engagement portion of the clutch input gear 18a are formed. A release rod 114 of the multi-plate friction clutch 18 is fitted to the right end of the oil hole 110 so as to be movable in the axial direction.

  The left end portion of the output shaft 15 is supported by a pair of upper and lower recesses 45 formed on the left side wall 48 of the upper crankcase member 2 and the left side wall 44 of the lower crankcase member 3 via the ball bearing 126. At the same time, it protrudes out of the mission chamber 11, and an output sprocket 127 is fixed to the protruding portion. The output sprocket 127 is linked to a sprocket on the rear axle via a rear wheel drive chain (not shown). An annular seal 128 is fitted on the left side of the ball bearing 126. The right end of the output shaft 15 is supported by a bottomed recess 132 formed in the shaft support member 13 via a needle bearing 133. An oil hole 122 extending in the axial direction is formed in the shaft core O 3 of the output shaft 15, the left end portion of the oil hole 122 is closed, and the right end portion of the oil hole 122 is formed in the wall of the shaft support member 13. In addition, the second oil supply passage 120 for transmission lubrication is communicated through a throttle 135. In the middle of the oil hole 122, vertical oil holes 122a extending in the radial direction and reaching the engagement of each driven gear on the output shaft 15 are formed.

  The left end portion of the change drum 16 is supported by the support hole 46 formed in the left side wall 44 of the lower crankcase member 3 of the transmission chamber 11 via the needle bearing 140, and the right end portion of the change drum 16 is the shaft support member. 13 is supported through a ball bearing 141 in a support hole 142 formed in 13.

  The left end portion of each shift fork support shaft 17 is fitted into the bottomed concave portion 47 formed in the left side walls 44 and 48 of the mission chamber 11, and the right end portion is a penetrating shape formed in the shaft support member 13. It is fitted in the fitting hole 143.

  FIG. 3 is a left side view of the crankcase 1. The axis O1 of the crankshaft 7, the axis O6 of the balancer shaft 8, and the axis O3 of the output shaft 15 are aligned with the upper and lower crankcase members 2, 3. Located on the surface S, the axis O2 of the input shaft 14 is located above the mating surface S, and the axis O4 of the change drum 16 is located below the mating surface S. A change shaft 19 having a change pedal is disposed below the change drum 16.

[Oil reservoir and oil inspection window]
As described above, the oil storage section as the semi-dry sump type lubricating device includes a lower portion of the mission chamber 11 shown in FIG. 4, a lower portion of the clutch chamber 12 communicating with the lower portion of the mission chamber 11 via the communication hole 42, The oil suction chamber 62 of the oil pan 23 of FIG. 7 communicates with the mission chamber 11 through the communication hole 86.

  FIG. 2 is a right side view of the clutch cover 88 that covers the right opening of the clutch chamber 12. A transparent oil inspection window 89 is provided below the clutch cover 88, and the oil in the clutch chamber 12 is externally provided. The level can be checked. The oil inspection window 89 is preferably located at a height at which the oil level L1 in the clutch chamber 12 when the operation is stopped is visible from the outside. The oil level L1 at the time of the stop of the operation is that the operation is stopped, and the oil in the oil storage portion including the inside of the clutch chamber 12 is passed through the adjustment hole 84 of the bottom plate 78 of FIG. This is the oil level when the oil level flows into the crank chamber 10 and the oil level in the oil reservoir and the crank chamber 10 is made uniform.

  On the other hand, the oil level L2 at the time of operation shown in FIG. 2 is that the oil in the crank chamber 10 (FIG. 4) is forcibly pumped out to the oil reservoir by the scavenging pump 51. The oil level is higher than the oil level L <b> 1, for example, a height substantially corresponding to the height of the partition wall 40 b (FIG. 4) at the front end of the clutch chamber 12. With respect to the oil level L2 during this operation, the multi-plate friction clutch 18 mounted on the input shaft 14 and the input gear 18a provided in the clutch housing of the clutch 18 are arranged at a high position where they are not immersed in the oil. ing. That is, by increasing the position of the input shaft 14, the position of the clutch 18 is increased, so that no power loss due to oil agitation occurs during operation.

[Oil recovery path from oil recovery chamber to oil reservoir]
FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 5. The suction part 51 b of the scavenging pump 51 opens downward into the oil pan 23 and is in a liquid-tight state at the upper end of the recovered oil suction passage 69. The discharge part 51c is open to the lower part (oil storage part) of the mission chamber 11 in communication. That is, the scavenging pump 51 sucks the oil returned to the oil recovery chamber 60 from the suction portion 51b through the recovery oil suction passage 69 and discharges it from the discharge portion 51c to the mission chamber 11.

[Oil supply path from oil pump to main gallery]
FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 5, and the suction part 50 b and the discharge part 50 c of the feed oil pump 50 are directed from the bottom wall of the lower crankcase member 3 to the oil suction chamber 62 in the oil pan 23. It opens downward, and the upper end of the funnel-shaped strainer (primary filter) 64 is connected to the suction part 50b so as to suck the oil in the oil suction chamber 62. A U-shaped oil supply pipe 73 extending forward in the oil pan mounting part 20 and the oil pan 23 is connected to the discharge part 50 c, and the front end of the oil supply pipe 73 is the front end of the oil pan mounting part 20. It is connected to an oil supply passage 74 formed in the section. The oil supply passage 74 communicates with an unpurified side of an oil filter (secondary filter) 75 fixed to the front end surface of the oil pan mounting portion 20, and a purification side outlet 75 a of the oil filter 75 is connected to a lower crankcase member. 3 communicates with an oil supply passage 91 formed on the bottom wall and extending rearward, and the oil supply passage 91 communicates with a main gallery 92 formed on the bottom wall of the lower crankcase member 3. That is, oil discharged from the oil pump 50 passes through the oil supply pipe 73, the oil supply passage 74, the oil filter 75, and the oil supply passage 91 in the oil pan 23, and enters the main gallery 92 in the bottom wall of the crankcase 1. It comes to be supplied.

[Oil supply path from main gallery to crankshaft lubrication point]
FIG. 10 is a cross-sectional view taken along the line XX of FIG. 5, and the main gallery 92 formed on the bottom wall of the lower crankcase member 3 is located substantially directly below the crankshaft core O1 and extends in the left-right direction. Oil communicates with the lower ends of the oil supply holes 35 formed in the left and right side walls 30L and 30R of the chamber 10 and the intermediate partition wall 29, and supplies oil to the bearing recesses 31 for supporting each crankshaft. An oil supply pipe 130 for balancer shaft lubrication is connected to the left end portion of the main gallery 92.

[Oil supply path from main gallery to mission lubrication point]
FIG. 12 shows an oil supply path for mission lubrication, and an oil supply passage 100 for mission lubrication extending upward from the lower end connection port 82 is formed in the left side wall 44 of the lower crankcase member 3 of the mission chamber 11. Has been. As described above, the connection port 82 communicates with the main gallery 92 via the oil supply pipe 94 for mission lubrication and the connection port 81. The left side wall 48 of the upper crankcase member 2 of the mission chamber 11 is formed with an oil supply passage 101 for mission lubrication that communicates with the upper end of the oil supply passage 100 of the lower crankcase member 3. It extends upward and opens toward the left (outside of the crankcase) at a position near the front of the input shaft 14. On the outer surface of the left side wall 48 of the upper crankcase member 2 of the mission chamber 11, an oil passage forming body 103, which is a separate member from the upper crankcase member 2, is detachably fixed. Includes an oil supply passage 104 extending in the length direction of the oil supply passage forming body 103 and an oil inlet 105 communicating with the upper end opening of the oil supply passage 101 of the upper crankcase member 2. A first oil outlet 106 located on the extension of the axis O2 of the input shaft 14 and communicating with the oil hole 110 of the input shaft 14 via the throttle 111 and the oil chamber 113a, and behind the input shaft 14. A second oil outlet 107 that opens at a position, and the oil inlet 105 and both oil outlets 106 and 107 are both on the right side. It is open toward. In addition, the oil supply passage forming body 103 is a cast product, and at the time of casting, the first oil supply passage 104 is cast with one end 104a opened, and after casting, a plug 104b is attached to the open one end 104a. At the same time, the oil inlet 105 and the oil outlets 106 and 107 are formed by machining. The oil inlet 105 and the oil outlets 107 can be formed by casting.

  The second oil outlet 107 communicates with an oil hole 112 formed in the left side wall 48 of the upper crankcase member 2 of the mission chamber 11. An oil communication pipe 115 is press-fitted and fixed in the oil hole 112, and the oil communication pipe 115 extends rightward, passes through the through hole 116 of the transmission mounting wall 41 of the upper crankcase member 2, and has a seal joint at the right end. A portion 115 a protrudes into the clutch chamber 12.

  An upper end connection port 120a of the second oil supply passage 120 for mission lubrication formed in the shaft support member 13 of the mission assembly M is detachably fitted to the joint portion 115a with seal, and is detachable in the left-right direction. It can be inserted and removed (parallel to the axial direction of the crankshaft). The second oil supply passage 120 in the shaft support member 13 extends downward, and the lower end portion communicates with the oil hole 122 of the output shaft 15 through the restrictor 135 as described above.

  In FIG. 3, the oil supply passage forming body 103 is disposed so as to be inclined rearward and is detachably attached to the left side wall 48 of the upper crankcase member 2 by a bolt 125. The oil supply pipe 130 for lubricating the balancer shaft extends forward and is connected to an oil supply passage 131 in the vicinity of the balancer shaft 8 so as to supply oil to the bearing portion of the balancer shaft 8.

  In FIG. 1, a second oil supply passage 120 for transmission lubrication formed in the wall of the shaft support member 13 extends downward from the rear upper position of the input shaft 14 through the rear side of the input shaft 14, The position corresponding to the output shaft 15 is reached.

[Oil flow throughout the engine]
FIG. 13 is a schematic diagram simply summarizing the flow of oil in the entire engine, and the oil in the oil reservoir composed of the mission chamber 11 and the like is fed from the oil suction chamber 62 in the oil pan 23 by the feed oil pump 50. Then, the oil is sucked through the strainer (primary filter) 64, pressurized, and pumped forward from the discharge part 50c through the oil supply pipe 73 to the oil filter (secondary filter) 75 at the front end of the oil pan mounting part 20. After entering and purifying, it is pumped to the main gallery 92 via the oil supply passage 74.

  Part of the oil pumped to the main gallery 92 is diverted to the three oil supply holes 35 for lubricating the crankshaft, and lubricates each journal portion of the crankshaft 7 (FIG. 1).

  Further, in FIG. 12, a part of the oil in the main gallery 92 is part of the oil supply pipe 94 for mission lubrication, the oil supply passage 100 for mission lubrication of the lower crankcase member 3, and the mission lubrication of the upper crankcase member 2. Is supplied to the first oil supply passage 104 for transmission lubrication of the oil supply passage formation body 103. A part of the oil in the first oil supply passage 104 is supplied to the oil hole 110 of the input shaft 14 with the flow rate adjusted via the first oil outlet 106 and the throttle 111, and the rest is the second The oil connection pipe 115, the second oil supply passage 120 for transmission lubrication in the shaft support member 13, and the throttle 135 are supplied to the oil hole 122 of the output shaft 15.

  The oil supplied to the oil holes 110 and 122 of the input shaft 14 and the output shaft 15 is lubricated to the fitting portion of each transmission gear and the fitting portion of the clutch 18 through the vertical oil holes 110a and 122a, respectively. Each fitting portion is lubricated, and the oil used for mission lubrication and clutch lubrication is directly returned to the oil storage portion below the mission chamber 11 and the clutch chamber 12.

  On the other hand, the oil utilized for crankshaft lubrication from the oil supply hole 35 in FIG. 5 returns to the bottom surfaces of the left and right crank chambers 10L and 10R, and is discharged independently from the oil discharge ports 53 and 54, respectively. The oil discharged from the oil discharge port 53 of the left crank chamber 10L reaches the space 56 through the oil recovery passage 55, and merges with the oil discharged from the oil discharge port 54 of the right crank chamber 10R. The oil is discharged into the oil recovery chamber 60 and filtered through a strainer (primary filter) 65.

  The oil filtered by the strainer 65 is sucked up by the scavenging pump 51 via the recovered oil suction passage 69 of FIG. 9 and discharged to the lower part (oil storage part) of the mission chamber 11.

[Assembly work of cassette type mission]
The cassette type mission assembly M can be assembled from the right side with respect to the mission chamber 11 in which the upper and lower crankcase members 2 and 3 are coupled.

  In FIG. 11, the transmission assembly M before assembly supports at least the right end portions of the input shaft 14, the output shaft 15, the change drum 16, and the shift fork support shaft 17 on the shaft support member 13. The right end portion of the output shaft 15 is fitted through a needle bearing 133 to a needle shaft outer ring 133a that is fitted in the output shaft support hole 132 of the shaft support member 13 in advance. On the other hand, on the left side wall 48 of the upper crankcase member 2 of the transmission chamber 11, the cap 113 and the outer ring 109a of the input shaft needle bearing 109 are fitted into at least the input shaft support hole 108, and the oil communication is performed. The tube 115 is press-fitted into the oil hole 112. The output shaft bearing 126 and the change drum needle bearing 140 are also fitted.

  The mission assembly M is inserted into the mission chamber 11 as a unit from the right side, and the left end portions of the input shaft 14, the output shaft 15, the change drum 16 and the shift arm support shaft 17 are connected to the corresponding support holes 108, upper and lower A pair of recesses 45, recesses 46, 47, etc. constituting a support hole are fitted directly or directly through the outer ring 109a, bearings 109, 126, 140, etc. The bolt 43 is fixed to the mounting wall 41.

  In the assembly step, by fitting the upper end connection port 120a of the second oil supply passage 120 of the shaft support member 13 in the axial direction to the joint portion 115a with a seal at the tip of the oil communication pipe 115 in FIG. Complete the entire oil supply passage for mission lubrication. At this time, the diaphragm 120c is incorporated adjacent to the connection port 120a. The oil supply passage forming body 103 is attached to the left side wall 48 of the upper crankcase member 2 in advance, but can be attached after the transmission assembly M is assembled.

  After assembling the transmission assembly M, the drive sprocket 25 is fitted to the right end portion of the input shaft 14 and the clutch 18 is attached, and the output sprocket 127 is attached to the left end portion of the output shaft 15.

[Effect of the embodiment of the present invention]
(1) A cassette type mission assembly M is configured by supporting a transmission shaft such as an input shaft 14 and an output shaft 15 on a shaft support member 13 which is a separate member from the crankcase 1. The shafts are inserted into the mission chamber 11 in the axial direction, and the other ends of the shafts 14 and 15 are inserted into the support holes 108 and the recesses 45 of the left side walls 44 and 48 of the mission chamber 11 through bearings 109, 126, 140, By fitting, the mission assembly M is assembled, and at the same time, the connection port 120a of the second oil supply passage 120 of the shaft support member 13 is fitted and connected to the joint portion 115a with the seal of the oil communication pipe 115. The entire oil supply passage for mission lubrication can be completed simultaneously with the assembly of the mission assembly M, and the assembly of the mission and the oil supply passage for mission lubrication can be assembled. Work is easy.

(2) The first oil supply passage 104 and the oil communication pipe 115 having a complicated structure are provided on the left side wall 48 of the mission chamber 11, that is, the oil communication pipe 115 and the oil inlet 105 communicating with the main gallery 92 are provided. A first oil supply passage 104 having a first oil outlet 105 communicating with the oil hole 110 of the input shaft 14 and a second oil outlet 107 communicating with the oil communication pipe 115 is provided, The shaft support member 13 of the transmission assembly M in which the area for forming the oil supply passage and the like is limited as compared with the left side wall 48 is provided with a second oil supply passage 120 having a simple structure, that is, the oil communication pipe 115. The second oil supply passage 120 having a simple structure extending from the oil hole 122 of the output shaft 15 to the oil hole 122 of the output shaft 15 is provided. Feeding passage without complicating the manufacture of the transmission assembly M is facilitated. In particular, the location of the oil supply passage can be easily avoided from the support portion such as the change drum 16, and the space for forming the oil passage in the shaft support member 13 can be used effectively.

(3) A first oil supply passage 104, an oil inlet 105, and first and second oil outlets 106 and 107 are formed in an oil supply passage forming body 103 which is a separate member from the crankcase 1, and the oil supply Since the passage forming body 103 is detachably attached to the side wall 48 of the mission chamber 11, the oil supply passage forming body 103 is uniquely cast as compared with the case where the passage forming body 103 is integrally formed with the crankcase 1. The one oil supply passage 104 can be easily cast and formed, and the occurrence of casting defects can be prevented and the yield can be increased.

(4) Since the oil communication pipe 115 is made of a pipe material that is a separate member from the crankcase 1, the degree of freedom in the arrangement position of the oil communication pipe 115 is increased, and an empty space in the mission assembly M is effectively used. The transmission assembly can be made compact.

(5) Since the first oil outlet 106 of the first oil supply passage 104 is provided with a throttle (flow rate restricting portion) 111 to limit the amount of oil flowing into the oil hole 110 of the input shaft 14, The amount of oil supplied from the second oil outlet 107 to the oil hole 122 of the output shaft 15 is not insufficient, and the oil can be supplied to the oil holes 110 and 122 of the shafts 14 and 15 almost evenly. it can.

(6) The sprocket 25 and the clutch 18 are mounted on the end of the input shaft 14 on the shaft support member 13 side, and the output sprocket 127 is mounted on the ends of the left side walls 44 and 48 of the transmission chamber 11 of the output shaft 15. Therefore, the clutch 18 and the output sprocket 127 can be arranged in a compact manner.

[Other embodiments]
(1) The above embodiment is a semi-dry sump type lubrication device using the mission chamber as an oil reservoir, but a dry sump type lubrication device in which a separate oil tank is installed outside the crankcase. Is also possible. The present invention is also applicable to a normal engine that stores predetermined oil in an oil pan.

(2) The first oil supply passage 104 for transmission lubrication is formed in the oil supply passage formation body 103 which is a separate member from the crank crankcase in the above embodiment, but is integrated into the crankcase side wall. It is also possible to form it. Further, as described above, even when the first oil supply passage 104 is formed in the oil supply passage formation member 103 which is a member different from the crankcase, the oil supply passage formation member 103 is not limited to a casting. , Die casting, forging or other moldings can also be used, and pipe materials can also be used. Furthermore, a structure in which the oil supply passage 104 and the like are formed by cutting may be used.

(3) In the above embodiment, the oil communication passage portion is provided with a pipe member separate from the crankcase, that is, the oil communication pipe 115. However, it can also be formed integrally in the wall of the crankcase 1. It is. Of course, even when the oil communication pipe 115 which is a member different from the crankcase is provided, the oil communication pipe 115 is not limited to the pipe member as described above, and is cast as in the case of the oil supply passage forming body 103. , Die casting, forging, or other molds.

(4) In the embodiment, the transmission shaft is provided with the input shaft 14 and the output shaft 15, and the oil for the mission lubrication is supplied to the oil holes 110 and 122 in the shafts 14 and 15 through the oil supply path according to the present invention. However, the present invention is also applicable to a transmission having an intermediate idle shaft or a reverse transmission shaft as a transmission shaft.

(5) The oil supply passage forming body 103 is a cast in the above-described embodiment, but may be a die-cast, forged or other molded product. Further, a pipe material can be used, and further, the oil supply passage 104 and the like can be formed by cutting.

Industrial application fields

  In addition to motorcycle engines, the present invention can also be applied to other vehicle engines such as automobiles.

1 is a right side view of a crankcase that is a parallel two-cylinder engine for a motorcycle equipped with a mission lubrication device according to the present invention, with a clutch cover removed. It is a right view of the clutch cover of the crankcase of the engine of FIG. It is a left view of the crankcase of FIG. It is the perspective view which looked at the lower crankcase member of Drawing 1 from the front right upper part. It is a top view of the lower crankcase member of FIG. It is a bottom view of the oil pan attachment part of the lower crankcase member of FIG. It is the perspective view which looked at the oil pan of FIG. 1 from the upper left front. It is VIII-VIII sectional drawing of FIG. It is IX-IX sectional drawing of FIG. It is XX sectional drawing of FIG. FIG. 4 is a developed sectional view taken along the line XI-XI in FIGS. 1 and 3 of the cassette type mission. It is sectional drawing which shows the oil supply channel | path etc. of a cassette type transmission. It is a piping perspective schematic diagram showing the flow of oil of the whole engine. It is sectional drawing of the transmission of the conventional engine. It is a right view which removes and shows the cover of the engine of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crankcase 11 Mission chamber 13 Shaft support member for cassette type missions 14 Input shaft 15 Output shaft 16 Change drum 17 Shift fork support shaft 18 Multi-plate friction clutch 41 Mounting wall 44 Left side wall of lower crankcase member in mission chamber 48 Mission Left side wall of lower crankcase member of chamber 103 Oil supply passage forming member 104 First oil supply passage for mission lubrication 105 Oil inlet 106 First oil outlet 107 Second oil outlet 110 Oil hole 111 of input shaft Restriction (flow restriction part)
120 Second oil supply passage for mission lubrication 122 Oil hole of output shaft 127 Output sprocket

Claims (6)

A transmission assembly in which one end side of the plurality of transmission shafts is supported by a shaft support member separate from the crankcase is detachably accommodated in the transmission chamber, and the other end side of each transmission shaft is connected to the transmission chamber. In the engine mission lubrication device in which an oil hole is formed in the shaft of each transmission shaft,
A first oil supply passage for mission lubrication communicating with the main gallery is provided on the side wall,
The first oil supply passage includes a first oil outlet that communicates with an oil hole of one transmission shaft, and a second oil outlet that communicates with an oil communication passage extending from the side wall toward the shaft support member. Have
The shaft support member is provided with a second oil supply passage for transmission lubrication that communicates with an oil hole of a transmission shaft different from the one transmission shaft, and the second oil supply passage is connected to the oil communication passage. A mission lubrication device for an engine having a connection port connectable to a tip of a part.   2. The engine lubrication apparatus according to claim 1, wherein a flow rate limiting portion is provided at a first oil outlet of the first oil supply passage.   The first oil supply passage provided in the side wall of the mission chamber is formed by a member separate from the side wall, and is detachably fixed to the side wall. 2. A transmission lubrication device for an engine according to 2.   The oil communication passage portion extending from the side wall of the mission chamber to the shaft support member is formed by a pipe member separate from the side wall, and is fixed to the side wall. The engine lubrication device described in 1.   5. A change shaft is disposed at a lower end portion of the mission chamber, and a change drum for change operation is supported at a lower portion of the shaft support member of the mission assembly. The engine mission lubrication measures described in 1. The one transmission shaft is an input shaft, and a clutch is attached to an end of the input shaft on the shaft support member side. A transmission shaft different from the one transmission shaft is an output shaft, and the output shaft 6. The engine mission lubrication device according to claim 1, wherein an output sprocket is attached to an end of the shaft on the side wall.

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