JPH0799235B2 - Oil sump device for vehicle engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an oil sump device for a motorcycle engine, and more particularly, a power unit in which a crankcase of the engine and a transmission are housed in a common case. Regarding what was said.

[Conventional technology]

A power unit for motorcycles and small automobiles often has a crank chamber and a transmission chamber in common, and an oil pan for lubricating oil provided on the lower surface thereof has a relatively large area. Therefore, the lubricating oil housed inside temporarily flows to one side of the room due to inertia when the vehicle turns, starts, or stops. Inhalation may not be possible. In order to prevent this, the inside of the oipan is divided into a plurality of parts by partition walls, the excess fluidity of the lubricating oil is suppressed, and notches are provided in the partition walls so that the lubricating oil can flow appropriately between them. The excessive flow preventing means has already been devised (for example, Japanese Utility Model Publication No. 42-14835).

[Problems to be solved by the invention]

By the way, this notch is provided at the bottom of the oil chamber in order to smoothly flow the lubricating oil flowing on the bottom. Further, although the partition wall is formed into a groove shape due to the mold division when casting the partition wall, the width thereof is relatively wide in order to smoothly return the lubricating oil to the suction port. For this reason, its width is made relatively wide. For this reason, when the vehicle has a ripple phenomenon when it is suddenly started or stopped, the lubricating oil in the suction chamber is temporarily allowed to flow back a large amount to the adjacent chamber through the notch, and the effect of the excessive flow prevention means is lost. Sometimes.

[Means for solving problems]

The present invention solves the above-mentioned problems and provides a means for limiting the amount of oil passing through the notch portion only when the lubricating oil returns smoothly in a normal state and when a ripple phenomenon occurs. The purpose of this is to divide the oil chamber into a plurality of sections by partition walls that are erected from the bottom surface, and to provide mutual communication by providing a cutout portion in a part of the partition wall, and to the cutout portion on one side of this cutout portion. It is characterized in that a baffle plate is provided opposite to.

[Action]

When the engine is operating in a stable state, the lubricating oil supplied to each part of the engine and the transmission, after finishing lubrication, falls into the oil chamber due to gravity and passes through the notches provided in the bulkhead to lower it further. Return to a suction chamber with a bottom.

When the vehicle suddenly starts or stops, the lubricating oil in the suction chamber temporarily flows backward or forward, increasing the liquid level and trying to pass through the notch, but at that time it collides with the baffle plate and kinetic energy is absorbed. Since it is lost and the liquid level is reduced, the lubricating oil in the suction chamber is prevented from excessively flowing into the adjacent chamber.

〔Example〕

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 is a power unit for a motorcycle, and an engine portion 2 having a crankshaft 2a arranged at a front portion thereof and a rear portion arranged at a rear portion thereof. Transmission unit 3 having drive shaft 3a and driven shaft 3b
It has and. 4 is the case of power unit 1,
The upper and lower halves 4a and 4b are superposed to form a box body, and the crankshaft 2a, the drive shaft 3a, and the driven shaft 3b are supported between them by bearings (not shown). An oil pan 5 is screwed to the lower surface of the lower case 4b, and an oil chamber 6 is formed inside them. The oil chamber is divided into three chambers 6a, 6b, 6c from the front side by the two partition walls 7, 7 extending from the bottom in the axial direction, and the bottom of the chamber 6b at the center is set lower. The suction port 8 of the lubricating oil pump is an opening. The chambers 6a and 6b on both sides are pans that receive the lubricating oil that drops from the top. 8a is a suction port 8
8b is a drain bolt.

In the present invention, as shown in FIG. 2, the partition walls 7 and 7 are integrally cast with the oil pan 5, and are cut out in places to form cutout portions 7a. The partition wall 7 has two cutout portions 7a and 7b. In FIG. 3, the baffle plate 9 is curved toward the suction chamber 6b, and the baffle plate 9 is provided facing the suction chamber 6b side of the cutout portion 7a. That is, the baffle plate 9 is integrally formed by casting from the bottom surface of the oil pan 5 on the suction chamber 6b side of the cutout portion 7a.

Thus, when the lubricating oil supplied from the suction chamber 6b to the engine and the transmission by the pump is finished lubricating, it falls into the oil chamber 6 by gravity and passes through the notch 7a provided in the partition wall 7 to further Reflux to the suction chamber 6b having a low bottom.

When the vehicle suddenly starts or stops, the lubricating oil in the suction chamber 6b causes a ripple phenomenon to increase the liquid level and temporarily does not pass through the notch 7a, but at that time immediately before reaching the notch 7a. It collides with the baffle plate 9 and loses kinetic energy to reduce the liquid level.
Therefore, the amount of the lubricating oil flowing from the inside of the suction chamber 6b through the cutout portion 7a to the adjacent chamber is reduced, and the problem that the suction port 8 of the pump is exposed on the oil surface is eliminated.

〔The invention's effect〕

As described above, the oil sump device for the vehicle engine of this invention is as follows.
Since the notch 7a and the baffle plate 9 are provided so as to face the notch 7a in a part of the partition 7 that divides the oil chamber 6, even if the notch 7a is made by casting, Even if the lubricating oil in the suction chamber 6b causes a ripple phenomenon at the time of sudden start or sudden stop, the lubricating oil flowing back through the notch 7a is blocked by the baffle plate 9, so that the suction port 8 of the pump is This has the effect of eliminating the problem of being exposed above.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a partially cutaway side view showing an essential part of an engine, and FIG. 2 is its II-II.
FIG. 6 ... Oil chamber, 6b ... Suction chamber, 7 ... Partition, 7a ... Notch, 9 ... Baffle plate.

Claims (5)

[Claims] 1. An oil chamber (6) is divided into a plurality of partitions by a partition wall (7) which is erected from the bottom surface, and a notch (7a) is provided in a part of the partition wall (7) so as to communicate with each other. At the same time, an oil sump device for a vehicle engine, in which a baffle plate (9) is provided on one side of the notch (7a) so as to face the notch (7a). 2. A vehicle engine according to claim 1, wherein a suction port (8) of the pump is opened in at least one chamber (6b) defined by a partition wall (7). Oil sump device. 3. A suction chamber (6) in which at least one chamber defined by a partition (7) is opened by a suction port (8) of a pump.
b), and the baffle plate (9) has a suction chamber (6) in the cutout (7a).
The oil sump device for a vehicle engine according to claim 1, wherein the oil sump device is opened to the side b). 4. The oil sump device for a vehicle engine according to claim 1, wherein the partition wall (7) is provided with a plurality of notches (7a). 5. The notch (7a) has a suction chamber (6b) at both ends of the partition wall.
The oil sump device for a vehicle engine according to claim 1, wherein the oil sump device is curved to the side.