JP2929503B2 - Engine lubricant pump - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a lubricating oil pump for an engine, and more particularly, to a case where a so-called cassette transmission type transmission is provided so that the shape of a crankcase cover can be simplified. About what you did.

[Conventional technology]

A cassette transmission type transmission device rotatably supports one end of a main shaft and a countershaft on which a plurality of sets of transmission gears are mounted by a lid member detachably attached to a crankcase cover side in a crankcase, and the other end. Is rotatably supported by a wall of the crankcase on the side opposite to the crankcase cover, so that the main shaft and the sub shaft can be removed from the crankcase in the axial direction together with the lid member.

Conventionally, as a lubricating oil pump in an engine equipped with such a cassette transmission type transmission, a pump case body is conventionally constituted by, for example, the lid member and a pump case body attached thereto, and an oil strainer is provided on the crankcase cover. In some cases, a strainer chamber for accommodating the strainer is formed, and the strainer chamber and the pump case communicate with each other via a suction passage formed in a lid member.

[Problems to be solved by the invention]

By the way, in the case of the conventional lubricating oil pump, since the strainer chamber is formed on the side of the crankcase cover, the shape of the crankcase cover becomes more complicated. On the other hand, since the crankcase cover is a portion that is highly likely to be replaced, there is a concern that repair costs at the time of replacement will increase due to the complexity of the shape.

Also, since the strainer chamber formed on the side of the crankcase cover and the pump case body communicate with each other through the suction passage formed in the cover member, the suction passage becomes longer, which complicates the structure of the pump and reduces processing costs. Also increases.

The present invention has been made in view of the above conventional problems,
It is an object of the present invention to provide a lubricating oil pump for an engine that can simplify the structure of a crankcase cover.

[Means for solving the problem]

The present invention provides a cassette transmission type transmission in which the main shaft 13 and the sub shaft 14 are arranged in parallel with the crankshaft 7 and one ends of the main shaft 13 and the sub shaft 14 are supported by the lid member 11 separate from the crankcase 1. A large reduction gear 10d, which is disposed in the crankcase 1 of the engine provided with the motor 8 and supplies lubricating oil to the lubricated portion, to which the driving force from the crankshaft 7 of the main shaft 13 is transmitted. A portion between the transmission gear 13a 'having the smallest diameter integrally formed with the main shaft 13 is supported by the lid member 11 via a bearing 15b. A pump case main body 26 having a supply portion 26f having substantially the same thickness as the axial thickness of the small-diameter transmission gear 13a 'overlaps the minimum-diameter transmission gear 13a' when the supply portion 26f is viewed in a direction perpendicular to the main shaft 13, and When viewed in the direction of the main shaft 13, the pump shaft is located within the projection plane of the reduction gearwheel 10d. And a blade chamber 26a accommodating the blade 27 is formed by a blade chamber forming member including the pump case main body 26 and the pump case main body mounting portion 11a of the lid member 11, and a lower edge of the lid member 11 is formed. A gap a is formed between the transmission chamber side portion and the transmission chamber side portion in the crankcase, and a lubricating oil in the crankcase 1 is removed from the blade chamber 26a. A suction passage 26d for introducing into the blade chamber 26a is formed in the blade chamber forming member so as to communicate with an inlet of the blade chamber 26a and open near the gap a, and an oil strainer 32 is attached to the suction passage 26d. It is characterized by:

[Action]

According to the lubricating oil pump according to the present invention, the strainer 32 is attached to the suction passage 26d formed in the blade chamber forming member including the pump case main body 26 and the pump case mounting portion 11a. The shape of the crankcase cover is simpler than when the strainer housing chamber is formed in the cover.

A gap a is formed between the lower edge of the lid member 11 and the inner surface of the bottom of the crankcase to communicate with the transmission chamber on the side of the reduction gear transmission chamber, and the suction passage 26d of the lubricating oil pump 24 is located close to the gap a. The lubricating oil can be efficiently sucked from both the reduction large gear disposition chamber side and the transmission chamber side through the gap a, so that the levels of the two lubricating oils can be reduced. , Reduction gear,
Agitation loss caused by the transmission gear group can be reduced. In forming the gap a, a notch 11e is formed at the lower edge of the lid member 11.
And the formation of the gap a is easy.

A portion between the reduction large gear 10d of the main shaft 13 and the minimum diameter transmission gear 13a 'is supported by the lid member 11 via a bearing 15d, and the inner surface of the lid member 11 is substantially the same as the minimum diameter transmission gear 13a'. The pump case body 26 having the supply section 26f having a thickness is
6f is mounted so that it overlaps with the minimum diameter transmission gear 13a 'when viewed in the direction perpendicular to the main shaft 13 and the pump shaft is located in the projection plane of the reduction gear 10d when viewed in the main shaft 13 direction. The supply part 26f of the case body 26 is the smallest diameter gear 13
The lubricating oil pump 24 can be arranged close to the main shaft 13 while preventing interference with the large-diameter transmission gear 13a adjacent to a ', and the cassette transmission type transmission can be made compact.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 8 are diagrams for explaining a lubricating oil pump for an engine according to an embodiment of the present invention. FIG. 2 is a right side view of the crankcase with a case cover removed, and FIG. , FIG. 3 and FIG. 4 are respectively II in FIG.
5 is a side view of the shift mechanism portion, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 7, FIG. 7 is a sectional view taken along the line IV-IV of FIG. The figure is a developed plan view of the shift mechanism.

In the figure, reference numeral 1 denotes a crankcase of the engine of the embodiment, which is a water-cooled two-cycle V-type two-cylinder engine. The crankcase 1 is of a front and rear split type including a front case 2 and a rear case 3,
The two cases 2 and 3 are fastened by bolts 4. A crankcase cover 6 is attached to the right openings 2a and 3a of the crankcase 1.

In the front case 2, an upper cylinder mounting surface 2b and a lower cylinder mounting surface 2c are formed so that respective cylinder axes form 90 degrees, and a lower cylinder intake port 2d is provided between the mounting surfaces.
Are formed. Reference numeral 5 denotes a stud bolt for mounting the cylinder body.

As shown mainly in FIG. 3, the rear case 3 includes a crank chamber 3b in which a crankshaft 7 is disposed, a transmission chamber 3c in which a transmission mechanism 8 is disposed, and a balancer chamber 3d in which a balancer shaft 9 is disposed. Are formed. The balancer shaft 9 has a pair of balancer weights 9a and 9b at both ends, and inner portions of both weights are supported by bearings 9c and 9d.
The two bearings 9c and 9d are supported by the left and right openings of the balancer chamber 3d.

The left and right ends of the crankshaft 7 are supported by bearings 7a, and the bearings 7a are supported by left and right openings of the crank chamber 3b. A balancer drive gear 10a and a reduction gear are provided on the outer side of the right bearing 7a of the crankshaft 7.
10b are mounted and fixed in order, and the balancer driving gear 1
Reference numeral 0a meshes with a balancer gear 10c fixed to the balancer shaft 9.

A left side portion (a portion opposite to a lid member 11 described later) of the mission chamber 3c is closed by a left side wall 3e, and an opening 3f is formed in a right side portion.
11 is fastened and fixed with bolts 12 (see FIG. 2). The transmission mechanism 8 housed and arranged in the transmission chamber 3c mainly includes a main shaft 13 and a sub shaft 14 arranged in parallel with the crankshaft 7, and a plurality of gears mounted on the main shaft and the sub shafts 13 and 14. In this configuration, the transmission gears 13a and 14a are meshed.

The left end of the main shaft 13 is a bearing 15a, and the right end is a bearing 15b.
The left bearing 15a is the left wall 3e of the transmission chamber 3c, and the right bearing 15b is the lid member 1
Each is supported by 1. The main shaft 13 is provided with a transmission gear 13 having a minimum diameter (first speed) so as to be adjacent to the bearing 15b.
a ′ is formed, and an inner case 17 of a clutch mechanism 16 is provided at the right end of the main shaft 13 protruding from the lid member 11.
Are fitted and fixed with splines or the like, and the clutch mechanism
The 16 outer cases 18 are supported by the main shaft 13 via bearings 15c. A large reduction gear 10d and an intermediate drive gear 10e are fixed to the boss portion of the outer case 18, and the large reduction gear 10d meshes with a small reduction gear 10b fixed to the crankshaft 13. 19 is the spindle 1
3 is a push rod, which is moved to the right in FIG. 3 by a pressing plate 20 for pressing the inner plate 17a mounted on the inner case 17 and the outer plate 18a mounted on the outer case 18 By doing so, the clutch mechanism 16 is disengaged.

The left part of the counter shaft 14 is a bearing 21a, and the right end is the bearing 2a.
1b, the left bearing 21a is supported by the left wall 3e of the transmission chamber 3c, and the right bearing 21b is supported by the cover member 11, respectively. A rear wheel driving sprocket 22 is fixed to a left end of the sub shaft 14 protruding from the left side wall 3e, and the sprocket 22 and a rear wheel sprocket are connected by a driving chain 23.

A lubricating oil pump 24 is mounted on the lid member 11 below the main shaft 13 in FIG. As shown mainly in FIG. 1, an oil pump case 25 of the lubricating oil pump 24 is provided.
Is composed of a pump case main body 26 and a case lid portion (pump case main body mounting portion) 11a of the lid member 11 to which the pump case main body 26 is attached. The lid member 1
A blade chamber 26a is formed in the pump case main body 26 by the blade chamber forming member including the pump case main body 1 and the pump chamber main body 26.
The oil blade 27 disposed in the blade chamber 26a is provided with an oil pump shaft 28 that penetrates the blade chamber 26a.
Is fixed with a pin 29. A pump gear 10f is fixed to an outwardly projecting portion of the oil pump shaft 28, and the pump gear 10f is an intermediate gear 10 integrated with the reduction gear 10d.
e (see FIG. 4).

Further, a strainer chamber 26e is formed so as to bulge inward at a part of the suction passage 26d continuous with the inlet side of the blade chamber 26a of the pump case main body 26, and the strainer chamber 26e
An oil strainer 32 made of a wire mesh or the like is provided therein. A notch 11e is formed at the lower edge of the lid member 11, and a gap a is formed between the notch 11e and the bottom inner surface of the rear case 3 for communicating the clutch arrangement chamber with the transmission chamber 3c. The supply portion 26f connected to the outlet side of the blade chamber 26a has substantially the same thickness as the thickness of the transmission gear 13a 'having the minimum diameter in the axial direction. The supply portion 26f substantially overlaps with the transmission gear 13a ', and the pump shaft is located in the projection plane of the reduction gear 10d when viewed in the main axis direction. Further, a leak hole 26c for allowing excess oil pressure to escape to the mission chamber 3c side is formed in a supply passage 26b formed in the supply section 26f, and an opening generated during hole processing is closed by a ball 30. ing. The supply passage 26b communicates with an upstream supply passage 11b formed in the lid member 11. The upstream supply passage 11b communicates with a first transverse passage 3g formed in the rear case 3, and the passage 3g extends across the rear case 3 to the left end of the main shaft 13 ( (See FIG. 3). The upstream end of the supply pipe 33 is connected to the upstream supply passage 11b of the lid member 11, and the pipe 33 extends upward through the outside of the lid member 11, and the downstream end thereof is the lid member. Downstream supply passage bulged at the subshaft 14 of 11
Connected to 11c. This downstream supply passage 11c communicates with the inside of the sub shaft 14, and further upstream portion 11d
Is a second transverse passage formed so as to cross the rear case 3
Connected to 3h. This second crossing passage 3h has a supply hose
It communicates with the balancer chamber 3d through 34 (see FIG. 3).

A water pump case 36a of a cooling water pump 35 is formed integrally with a portion of the left side wall 3e of the rear case 3 facing the lubricating oil pump 24. A water pump shaft 37 arranged to penetrate the water pump case body 36a is coaxial with the oil pump shaft 28 of the lubricating oil pump 42. The left end of the water pump shaft 37 is pivotally supported by a water pump case 36a, a water blade 36b is fixed to a protruding end thereof, and the right end thereof is pivotally supported by the case body 26. A projecting piece 28a formed at the left end of the oil pump shaft 28 is inserted into a slit 37a formed at the right end of the water pump shaft 37, whereby the cooling water pump 3
5 is detachably connected to the lubricating oil pump 24.

A kick shaft 38 is rotatably inserted into a portion of the lid member 11 behind the lubricating oil pump 24, and a kick shaft 38 is rotatably inserted into the lid member 11. The movement in the direction is prevented and the return spring 41 urges the return spring 41 to a predetermined position. A kick gear is provided on a portion of the kick shaft 38 outside the lid member 11.
The kick gear 10h is adapted to be engaged with the pump gear 10f of the lubricating oil pump 24 during a kick operation. The kick shaft 38 has a right end protruding outward from the crankcase cover 6.
40 are installed.

Further, a shift mechanism 40 is mounted on a portion of the lid member 11 above the kick shaft 38 and the lubricating oil pump 24. The shift mechanism 40 mainly includes a shift shaft 52 that is rotationally driven by a depressing operation of a change pedal, a shift drum 41 that is rotationally driven by the shift shaft 52 via a shift lever 50, and a shaft that is axially driven by the shift drum 41. It is composed of three shift forks 43 driven in the directions.

The left end of the shift drum 41 is the left side wall of the rear case 3
3e, and the right end is supported by the lid member 11 via a bearing 53. A sliding pin 43a of the shift fork 43 is inserted into a guide groove 41a recessed on the peripheral surface of the shift drum 41, and a shift claw 43b of each shift fork 43 is connected to the transmission gear 13a of the main shaft 13 and the sub shaft 14. , 14a. The shift fork 43 is pivotally supported by shift guides 42a and 42b, and the left and right ends of the shift guides 42a and 42b are supported by the left wall 3e of the rear case 3 and the lid member 11. I have.

A segment 44 is fixed to the right end surface of the shift drum 41 with a fixing pin 46, and a shift arm 45 arranged in the segment 44 is supported by the fixing pin 46. Between the segment 44 and the shift arm 45, there is provided a moderation mechanism which comprises a locking claw 47, a pressing pin 48, and a biasing spring 49, and provides a moderation to the rotation of the shift drum 41. Reference numeral 51 denotes a cover that covers the segment 44 and the like.

A long hole 50a formed at the tip of the shift lever 50 is engaged with a connecting pin 45a formed on the shift arm 45. The shift lever 50 is fixed to a tip end of the shift shaft 52, and a locking claw 50 formed on the fixed portion is provided.
b is engaged with a stopper pin 58 implanted in the lid member 11. The shift shaft 52 is pivotally supported by the lid member 11, is urged to a neutral position by torsion sprinkles 54 and 55, and is further prevented from axially rightward removal by a washer 57 and a circlip 56. .

 Next, the operation and effect of this embodiment will be described.

In the present embodiment, the rotation of the crankshaft 7 is controlled by the reduction small gear 10b,
The lubrication oil pump 24 is transmitted to the pump gear 10f via the reduction gear 10d and the intermediate gear 10e. As a result, the lubricating oil stored in the rear case 3 and the crankcase cover 6 is sucked from the suction passage 26d, pressurized in the blade chamber 26a via the strainer 32, and supplied to the supply passage 2d.
It is discharged from 6b and supplied to each lubricated part. Further, the rotation of the oil pump shaft 28 of the lubricating oil pump 24 is transmitted to a water pump shaft 37 connected thereto, whereby the cooling water pump 35 is also driven, and the cooling water is supplied to each part to be cooled. Become.

As described above, in the present embodiment, the strainer chamber 26e is integrally formed in the suction passage 26d of the pump case main body 26 in the middle of the suction passage 26d.
Since the strainer 32 is disposed here, the structure of the crankcase cover 6 and the lubricating oil pump itself is simpler than the case where the strainer chamber is formed in the crankcase cover as in the above-described conventional example. The cost of replacing the cover 6 can be reduced. Also the above pump case body
Since the strainer chamber 26e is formed in the middle of the suction passage 26d of 26, it is not necessary to form the suction passage in the lid member by drilling as in the above-described conventional example.

In this embodiment, the supply passage 26 of the pump case main body 26 is provided.
Since the leak hole 26c opened in the mission chamber 3c is provided in the portion b, the discharge pressure does not become excessive. That is,
Even when it is difficult to reduce the rotation speed of the pump because the reduction ratio to the lubricating oil pump 24 cannot be sufficiently ensured, it is possible to prevent the hydraulic pressure from excessively increasing.

Further, since a part of the supply passage from the lubricating oil pump 24 is constituted by the supply pipe 33 arranged outside the lid member 11, the degree of freedom on the supply path is improved, and the lid member 11 is
It is not necessary to increase the thickness as in the case where the supply passage is formed in the inside of the eleventh embodiment.

〔The invention's effect〕

As described above, according to the lubricating oil pump for the engine according to the present invention, the suction passage communicating with the blade chamber is formed in the blade chamber forming member, and the strainer is attached to the suction passage. Has the effect of simplifying the structure of the crankcase cover as compared to the case of forming the lubricating oil.In addition, the lubricating oil can be efficiently sucked from both the side where the reduction gear is disposed and the transmission chamber, thereby lowering the lubricating oil level. To reduce the diffusion loss.In addition, the lubricating oil pump can be arranged close to the main shaft.
There is an effect that the cassette transmission can be downsized.

[Brief description of the drawings]

1 to 8 are diagrams for explaining an accessory driving structure of an engine according to an embodiment of the present invention, and FIG. 2 is a right side view of the crankcase with a case cover removed.
1, 3, and 4 are sectional views taken along lines II, III-III, and IV-IV of FIG. 2, respectively. FIG. 5 is a side view of a shift mechanism, and FIG. 7 and 8 are development views thereof, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. In the figure, 1 is a crankcase, 7 is a crankshaft, 8
Is a cassette transmission type transmission, 11 is a cover member, 11a is a case main body mounting portion, 13 is a main shaft, 14 is a sub shaft, 24 is a lubricating oil pump, 26 is a pump case main body, 26a is a blade chamber, 26d is a suction passage, 26e is a strainer room, 27 is a blade, and 32 is an oil strainer.

Claims (1)

(57) [Claims] 1. The crank of an engine having a cassette transmission type transmission in which a main shaft and a sub shaft are arranged in parallel with the crank shaft, and one ends of the main shaft and the sub shaft are supported by a lid member separate from the crank case. Placed in the case,
In a lubricating oil pump that supplies lubricating oil to a lubricated portion, a portion between a reduction gear that receives a driving force from a crankshaft of the main shaft and a transmission gear having a minimum diameter formed integrally with the main shaft is formed by A pump case main body which is supported by a cover member via a bearing and has a supply portion having a thickness substantially equal to the axial thickness of the transmission gear having the minimum diameter below the main shaft on the inner surface of the cover member,
The supply chamber overlaps with the minimum-diameter transmission gear when viewed in a direction perpendicular to the main shaft, and the pump chamber is mounted so that the pump shaft is positioned in the projection plane of the reduction gear when viewed in the main shaft direction. The large reduction gear is disposed in the crankcase between the lower edge of the lid member and the inner surface of the bottom of the crankcase, the blade being formed of a blade chamber forming member including the pump case main body and the pump case main body mounting portion of the lid member. A gap is formed to communicate the chamber side portion and the transmission chamber side portion, and a suction passage for introducing lubricating oil in the crankcase into the blade chamber is communicated with an inlet of the blade chamber and close to the gap. An oil strainer is formed in the blade chamber forming member so as to be open and an oil strainer is attached to the suction passage.