JPS61215411A - Oil housing construction of internal-combustion engine - Google Patents

Abstract

PURPOSE:To provide a more compact engine by forming a partition wall which separates a transmission housing case and a crankshaft housing case from each other and mounting an oil pumping mechanism which constantly pumps up oil into the transmission housing case. CONSTITUTION:A case 3 is disposed below an engine 1 and consists of both a front crankshaft housing case 8 and a rear transmission housing case 9 which are directly beneath a cylinder block 2. Both said cases 8 and 9 have a partition wall 12 therebetween for the separation purpose, said wall consisting of a rising wall part 12a, left and right side walls 12b and 12c, and a bottom wall 12d. One 12b of the side walls has a through-hole 13 which communicates said case 8 with the internal space 6a of a cover 6. An oil pump mechanism not illustrated in the drawing is provided to constantly pump up oil to said case 9. Thus the crankshaft 10 can be lowered so that purpose as designed above can be fulfilled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oil storage structure for an internal combustion engine mainly used in motorcycles and tricycles.

(Prior Art) As an internal combustion engine for a motorcycle, an engine in which a transmission storage case and a crankshaft storage case are integrated has been put into practical use. The case (53) installed in the front part is used as a crankshaft storage case (50), and the rear part is used as a two-way storage case (55), and the oil pan (5B) is located at the bottom of each case. They are formed so that they share the bottom of the upper case and are connected to each other.Oil (57) is stored on the oil pan (58), and oil (57) is stored on the oil pan (58).
The clean surface level (L) of 57) must be at the level necessary to lubricate the transmission case, the oil (57) must be stored in the amount necessary to lubricate each mechanism, and the crankshaft etc. must be It is necessary to ensure that it does not outperform oil.

(Technical issue) The following conventional technology makes the bottom of each case part continuous,
Since the oil level is the same in both the crankcase and the transmission case, the oil level has to match the transmission case side.On the other hand, as mentioned above, the oil level on the crankshaft must not be higher than the oil level. Therefore, the volume of the oil pan increases, especially the height dimension of the oil pan, which increases the overall size of the engine including the case, increases the weight, and furthermore, the engine is exposed. In motorcycles and the like, as the vertical dimension of the case increases, the ground clearance decreases, and if the engine is placed higher up, the vehicle height increases, leading to an increase in the overall size of the vehicle body.

The present invention has been made to solve the above technical problems, and its purpose is to make the oil pan suitable for the transmission storage area and the crankshaft storage area, and to lower the position of the crankshaft. To provide an oil storage structure for an internal combustion engine, which makes it possible to reduce the vertical dimension of the engine as much as possible, thereby making the engine more compact.

(Means for Solving Technical Problems) A means for solving the above technical problems is to provide an internal combustion engine in which a transmission storage case and a crankshaft storage case are integrally configured. In addition to providing a partition wall to separate the transmission case, an oil pump mechanism is also provided to constantly pump oil into the transmission storage case.

(Effect of the above means) According to the above means, a storage wall is provided between the transmission storage case and the crankshaft storage case, and the necessary amount of oil is supplied to the transmission mechanism while being shared with the engine side, so that the transmission can be stored. By defining the crankshaft storage case without considering the case, the crankshaft and the bottom of the storage case can be brought close to each other without considering interference between the crankshaft and the oil. The height can be reduced, and on the other hand, the transmission mechanism can be lubricated with sufficient oil by using the transmission case defined by the bulkhead as an oil chamber, and the oil is constantly pumped up by the oil pump mechanism. and sent to the mission storage case.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cutaway side view of the engine case.

FIG. 2 is a longitudinal sectional front view of the main parts, and FIG. 3 is a developed cross-sectional view of a case portion showing an example of an oil pump.

In the figure, (1) is the engine, and the cylinder block (2) is the engine.
A case (3) is disposed below the case (3), and the case (3) is composed of left and right half-hoists (4), (5), and left and right covers (8), (7) that cover the outside of these.

The front part of the case (3) just below the cylinder block (2) is the crankshaft storage case (8), and the rear part of this is the transmission storage case (8). is the crankshaft (
10) is horizontally supported, and the mission storage case (8) stores the mission filter mechanism (11). Such a case (3
) between the crankshaft storage case (8) and the transmission storage case (8) is a partition wall (12) that partitions both.
will be established.

1 interval? (12) is a raised wall part (12a) provided between cases (8) and (9), and left and right side walls (12b), (1
2c) and a bottom wall (12d), and these walls have left and right half-holes (4a) and (5a
), and are integrated by joining half-holes (4) and (5). One side wall (12b) of the partition wall (12) is provided with a through hole (13) that communicates the crankshaft storage case (8) with the space (8a) inside the cover (fi) on this side outside of the crankshaft storage case (8).

In the above, the oil level (L) in the transmission storage case (8) defined by the partition wall (12) is raised, and the transmission mechanism (11) is brought into a nearly half-plate state to supply sufficient oil. The amount of oil should be sufficient to prevent air intake when driving the oil pump. On the other hand, the oil level in the crankshaft storage case (8) is extremely low or there is oil in the atmosphere, and as a result, the crankshaft (10) can be disposed low and close to the bottom of the crankshaft, and the crankshaft The storage case bottom (8a) is raised as a result, reducing the overall height of the engine, and on the other hand, the oil level (L) in the Mitsugeon storage case (9) is separated from the crankshaft storage case by the aforementioned partition wall (12). Therefore, it can be set high without considering this. Oil is supplied to each part of the engine from the mission case side, which is partitioned by a bulkhead (12).
The oil that lubricates each part of the engine is discharged to the side space (6a), and the oil that has returned to the space (8a) returns to the front and back of the cover (8), and is constantly pumped to the transmission storage case (9) side by the oil pump mechanism. Repeat 6 or more pumped and fed. As a result, the oil level in the misho case is always maintained at a predetermined level.

By the way, the oil pump mechanism can be provided as desired, but Fig. 3 shows an example of this mechanism, and the kick starter spindle (14)
The starter gear (15) installed in the mission mechanism (11
) is installed at the shaft end of the output shaft (lla) of the idle gear (1
8), the gear (1B) is meshed with the gear (17) of the countershaft (llb) adjacent in parallel, and the gear (18) is provided around the clutch outer (18).
The starter gear (2) is installed on the crankshaft (10).
1). Kickstarter spindle (14
), the slider (14a) is engaged with the gear (15), and the crankshaft (10) is rotated for starting via the gears (113), (17), (19), and (20), and the engine is started. After that, the gear (15) is rotationally driven by the gear system.

Therefore, a blade (20a) is provided inside the gear (15), and a recess (2ob) for storing the blade (2Oa) is provided in the side wall (12b) of the partition wall (12), and an inlet, A discharge port is attached to the oil pump (
20).

By the way, as a specific example of the pump, a trochoid pump is shown in FIG.

The tip (141) of the kick starter spindle (10) is fitted into and supported by the boss (4e) of the case wall (4b), and a recess (26) forming the pump housing is formed on one side wall of this part.
is formed, and a trochoid pump outer (2
01) is inscribed, while the trochoid pump inch (
202) on the shaft of the spindle (14) by spline fitting or the like, and the inch (202) is attached to the spindle (14).
The kick starter pinion gear (203
), and (23) in the figure shows the previously mentioned slider at the time of starting operation.

By the way, the other side of the wall (4b) is provided with an inlet (204) and an outlet (205), and the inside of the inlet (204) is opened toward the transmission case as a recess (20B). 207) to form a closing suction route. With this configuration, the oil on the right side of the wall (4b) is pumped up into the transmission case on the left side.

Incidentally, in the embodiment, lubrication of each part of the engine is performed as follows.

FIG. 5 shows this, and the oil to the above-mentioned sewing machine case passes from the through hole (13) in the side wall of the crankshaft housing case through the side of the outer cover and the partition wall (12).

Oil play) (2G?) Inlet port (20
It is sucked into the pump from 0 and pumped into the transmission case from the discharge port (205). Mission case (
A recess (3a) is provided in the lower side of the front wall (12a) of the partition wall (12) in 8), and oil is supplied to the recess through the hole (9b), and is supplied to the recess through the oil strainer (27). The lower end of the suction pipe (28) is facing, the suction pipe (28) is connected to the suction port (30) of the oil pump (29) driven by the crankshaft, and the supply pipe (31) is connected to the discharge port (31) of the pump (29). 32) and supplies oil to the oil passages of each part of the engine via the oil filter.

(Effects of the Invention) As is clear from the above, according to the present invention, a single case constitutes a transmission storage case and a crankshaft storage case, and the crankshaft is lowered to near the bottom of the case, reducing the overall height of the engine. In addition to reducing the size and weight of the engine, a sufficient amount of oil can be secured on the side of the engine storage case, resulting in excellent 1m performance.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a cutaway side view of the engine case, FIG. 2 is a longitudinal sectional front view of the same main part, and FIG. 3 is a cross-sectional view showing an example of an oil pump. A developed cross-sectional view of the case part, Figure 4 is a diagram of a specific example of an oil pump, Figure 5 is a partially enlarged side view showing the engine lubrication system and oil supply system to the mixer tank, and the TSS diagram is a conventional diagram. It is an example FIJ diagram. In the drawing, (1) is the internal combustion engine, (8) is the t± crankshaft storage case, (9) is the transmission storage case, and (12) is the internal combustion engine.
) is a partition wall, and (20) is an oil pump.

Claims (1)

[Claims] In an internal combustion engine in which a transmission storage case and a crankshaft storage case are integrated, a partition wall is provided to separate the transmission storage case and the crankshaft storage case, and an oil pump mechanism is provided to constantly pump oil into the transmission storage case. An oil storage structure for an internal combustion engine characterized by: