JP2556078B2 - engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine, and more particularly to an installation mode of the pump in an engine having a large number of pumps.

[Conventional technology]

An ordinary engine is equipped with a pump that supplies oil by pressure to each part of the engine for lubrication or the like. A water-cooled engine has a water pump in addition to the oil pump described above, and a vehicle engine equipped with power steering has an oil pump for power assist.

Each of the above-mentioned pumps is usually installed at the end of a rotary shaft such as a crank shaft or a transmission shaft, and is configured to be driven by the above-mentioned rotary shaft.

By the way, if an oil pump or the like is provided at the end of the rotary shaft, the outer shape of the engine, especially the size in the rotary shaft axial direction, becomes large when a large pump is used. If this is the case, there is no choice but to use a pump with a small capacity, which limits the improvement in engine performance. Further, if a plurality of pumps are respectively arranged at the end portions of a plurality of rotating shafts, the outer shape of the engine becomes large as a whole, which hinders the miniaturization of the engine.

[Object of the Invention]

In view of the above situation, the present invention is capable of equipping a plurality of pumps having a capacity as large as possible, and at the same time, capable of reducing the outer shape, particularly the dimension in the direction of the rotation axis as much as possible. The purpose is to provide.

[Structure of Invention]

Therefore, in the present invention, the above object is achieved by arranging the water pump and the plurality of oil pumps in parallel with each other on the pump drive shaft that is installed parallel to the axis of the crank shaft.

Further, in the present invention, one of the oil pumps is housed and installed inside the crankcase, and the other oil pump and the water pump are respectively installed outside the crankcase so as to sandwich the one oil pump, and the crankshaft shifts. Through a power transmission means having a drive gear provided at the end of the pump and a driven gear provided between adjacent pumps on the pump drive shaft, the pump shaft is driven to rotate by rotation of the crankshaft, and the crankcase An oil filter is arranged close to one of the oil pumps.

Further, according to the present invention, the rotary shafts of the one oil pump, the other oil pump, and the water pump are connected to each other to form a pump drive shaft, and the adjacent rotary shafts are fitted with the convex portions and the concave portions. The rotary shafts are coupled to each other to connect the rotary shafts to each other, and the connecting portions of the adjacent rotary shafts are supported by bearings.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment.

FIG. 1 shows an example in which the present invention is applied to a square 4 engine for mounting on a small vehicle such as a motorcycle or a straddle-type four-wheel vehicle.

In the engine 1, a drive gear 3 is fixedly provided at an end portion of a first crankshaft 2, and the drive gear 3 is supported by a crankcase 5 supported by a crankcase via a support shaft 4.
The small-diameter gear 7 of the gear block 5 meshes with the large-diameter gear 6 of FIG. 1 and further meshes with the driven gear 8 fixed to the rotary shaft 51 of the oil pump (one oil pump) 50. The drive gear 3, the large-diameter gear 6, the small-diameter gear 7, and the driven gear 8 constitute a power transmission means 10.

The oil pump 50 is a trochoidal pump, and includes a housing 52 fixed to a crankcase, the rotary shaft 51 having an inner rotor gear 53 fixedly mounted, and an outer rotor gear 54. In addition, the oil pump 50
An oil filter 40 is disposed above the pump 50 in the vicinity of the pump 50, and the oil discharged from the oil pump 50 passes through the filter element 41 as indicated by arrows O and P, and then to the various parts of the engine. It will be pumped.

To the right of the oil pump 50 in the figure, the water pump
60 are provided. The water pump 60 is a vortex pump, and includes a housing 61 fixed to a crankcase, a rotary shaft 62 supported in the housing, and an impeller 63 fixed to an end portion of the rotary shaft 62. ing.

On the other hand, on the left side of the oil pump 50 in the drawing, a sub oil pump (other oil pump) 70 for power assist in a power steering mechanism (not shown) is arranged. The sub oil pump 70 is a vane pump, and includes a rotating shaft 72 supported in a housing 71 fixed to a crankcase, a rotor 73 fixed to an end of the rotating shaft 72, and the like.

A convex portion 51a is formed on the right end of the rotary shaft 51 of the oil pump 50, and by fitting the convex portion 51a into a cutout groove 62a formed on the left end of the rotary shaft 62 of the water pump 60, The rotating shafts 51 and 62 are connected to each other.
Further, the rotary shaft 51 of the oil pump 50 and the rotary shaft 72 of the sub oil pump 70 are coupled to each other by fitting a convex portion 51b, which will be described later in detail, into a concave portion 72a.

The pump drive shaft 100 is configured by connecting the rotary shafts 51 and 62 and the rotary shafts 51 and 72 to each other. In FIG. 1, reference numeral 1a is a generator case, 1b is a part of the crankcase that houses a second crankshaft (not shown), 1c is a variable mass flywheel housing case, and 1d is a mission housing part. , 1e is a clutch case, and 1f is a drive sprocket.

As clearly shown in FIGS. 2 to 4, at the end of the rotary shaft 51, a convex portion 51b is formed which extends in the diameter direction of the rotary shaft 50 and extends in the axial direction. On the other hand, the rotary shaft 72 in the sub oil pump 70 is formed to have a diameter larger than that of the rotary shaft 51, and at the end of the rotary shaft 72,
A concave portion 72a having a shape corresponding to the convex portion 51b is recessed. A bearing 90 is provided between the crankshaft 1g and the outer periphery of the end of the rotary shaft 72, and the recess 72a is located in the central region of the bearing 90. Thus, the convex part
The oil pump 50 and the sub oil pump 70 can be brought as close as possible by arranging the 51b, the recess 72a, and the bearing 90 so as to overlap each other. The rotary shaft of the oy pump 50
It goes without saying that the 51 and the rotary shaft 62 of the water pump 60 can be connected by a joint having the same aspect as the above-mentioned configuration.

Now, when the engine 1 starts operating, the rotation of the crankshaft 2 is transmitted via the power transmission mechanism 10 to the pump drive shaft 10
0, and the water pump 60, the oil pump 50, and the sub oil pump 70, which are arranged side by side on the pump drive shaft 100, are driven simultaneously.

It should be noted that the present invention is not limited to the Square 4 engine and can be effectively applied to various types of engines, and the types of each pump are limited to trochoid pumps, spiral pumps, and vane pumps. It goes without saying that this is not what is done. Further, the order of arranging the water pump, the oil pump, and the sub oil pump on the pump drive shaft is not limited to this example, and can be appropriately set according to design conditions and the like.

〔The invention's effect〕

As described above in detail, in the engine according to the present invention,
Since the water pump and the multiple oil pumps were installed side by side on the pump drive shaft that was installed parallel to the axis of the crank shaft, each pump was installed at the end of the rotary shaft such as the crank shaft or the transmission shaft. This eliminates the need for designing each pump, which makes it possible to use a pump having a large capacity and to suppress the increase in size in the direction of each rotation axis as much as possible.

Further, since one oil pump is housed in the crankcase and the other oil pump and the water pump are installed outside the crankcase, the crankcase can be made as small as possible, which simplifies engine manufacturing. Of the oil pump and the water pump, the maintenance work of the other oil pump and the water pump installed outside the crankcase can be easily performed, and further, one oil pump housed in the crankcase and With the water pump installed outside the crankcase, the oil and the water are surely separated from each other.

Also, by disposing an oil filter in the crankcase close to one of the oil pumps, the appearance of the engine can be made compact, and at the same time, a driven gear that is linked to the drive gear at the end of the crankshaft. Is provided between the pumps adjacent to each other on the pump drive shaft, and the space between the pumps is effectively used, so that the size of the engine in the rotation axis direction can be reduced as much as possible.

Further, the rotary shafts of the one oil pump, the other oil pump, and the water pump are fitted into the convex portions and the concave portions provided on the respective rotary shafts to form a pump drive shaft, and the adjacent rotary shafts are connected. By supporting the part by the bearing and overlapping the convex portion, the concave portion, and the bearing with each other, it becomes possible to arrange the adjacent pumps close to each other, thereby allowing the dimension in the rotation axis direction of the engine to be adjusted. It can be miniaturized as much as possible.

[Brief description of drawings]

FIG. 1 is a conceptual cutaway view showing an essential part of an engine according to the present invention, FIG. 2 is a sectional side view of an essential part showing a joint portion, and FIG. 3 is a sectional view taken along line III-III of FIG. , FIG. 4 is an exploded perspective view of an essential part showing a joint portion. 1 ... Engine, 2 ... Crankshaft, 10 ... Power transmission means, 50 ... Oil pump (one oil pump), 60 ... Water pump, 70 ... Sub oil pump (other oil pump), 100 …… Pump drive shaft.

Front Page Continuation (72) Inventor Yukihiro Takasaki 231-1 Shirahane-cho, Hamamatsu City, Shizuoka Prefecture (56) References JP-A-50-30102 (JP, A) JP-A-52-98807 (JP, A)

Claims (1)

(57) [Claims] 1. An engine comprising a water pump and a plurality of oil pumps arranged side by side on a pump drive shaft arranged parallel to the axis of the crank shaft, wherein one of the oil pumps is inside the crankcase. And the other oil pump and the water pump are installed outside the crankcase in such a manner as to sandwich the one oil pump, and on the pump drive shaft and the drive gear provided at the end of the crankshaft. The pump drive shaft is rotationally driven by the rotation of the crankshaft via the power transmission means having a driven gear provided between the adjacent pumps, and an oil filter is arranged in the crankcase in proximity to one of the oil pumps. In addition, connect the rotating shafts of one oil pump, the other oil pump and the water pump to each other. The pump drive shaft, and the projections and recesses provided on the adjacent rotary shafts are fitted to connect the rotary shafts to each other, and the connecting portions of the adjacent rotary shafts are supported by bearings. Engine characterized by.