JP7192449B2 - oil pump - Google Patents

Description

The present invention relates to oil pumps.

An oil pump is used to supply oil to the internal combustion engine for cooling and lubrication of the internal combustion engine. An oil pump is driven by a driving force transmitted from a crankshaft of an internal combustion engine via a chain or the like (Patent Document 1, etc.).

JP-A-8-270426

However, the tension of the chain may cause the oil pump to vibrate and generate noise. Accordingly, it is an object of the present invention to provide an oil pump capable of suppressing vibration and noise.

The above object is to provide a transmission unit that is attached to the surface of a crankcase of an internal combustion engine, separates from the surface of the crankcase, and transmits driving force from the internal combustion engine as tension in a direction pulling toward the surface of the crankcase. and a mounting portion that is used to mount the oil pump on the surface of the crankcase and is fastened to the crankcase, and a side opposite to the transmission portion with the mounting portion in contact with the surface of the crankcase This can be achieved by an oil pump with a convex protrusion projecting into the

An oil pump capable of suppressing vibration and noise can be provided.

FIG. 1(a) is a plan view illustrating an oil pump, and FIG. 1(b) is a side view illustrating the oil pump.

Hereinafter, the oil pump 10 of this embodiment will be described with reference to the drawings. FIG. 1(a) is a plan view illustrating the oil pump 10, and FIG. 1(b) is a side view illustrating the oil pump 10. FIG. The X, Y and Z axes are orthogonal to each other. The surface of the crankcase 20 extends on the XY plane. The +Z direction is upward and the -Z direction is downward.

As shown in FIGS. 1(a) and 1(b), a transmission portion 12 is provided at the tip of the oil pump 10 on the +X side, and a mounting portion 14 and a convex portion 16 are provided on the -X side. there is The attachment portion 14 includes, for example, a screw hole, and the oil pump 10 is attached to the surface (lower surface) of the crankcase 20 by screwing the bolt 15 into the screw hole.

The convex portion 16 protrudes from the mounting portion 14 to the side opposite to the transmission portion 12 (−X side) with the mounting portion 14 interposed therebetween, and contacts the surface of the crankcase 20 . A distance D1 from the attachment portion 14 to the tip of the projection 16 in the X-axis direction is, for example, about 1/10 of a distance D2 from the attachment portion 14 to the tip of the transmission portion 12 .

As shown in FIG. 1B, a sprocket 22 is attached to the transmission portion 12, and a chain 24 is stretched over the sprocket 22. As shown in FIG. The chain 24 is also stretched over a crankshaft of an internal combustion engine (not shown). When the crankshaft rotates, the driving force of the crankshaft is transmitted to the transmission section 12 via the chain 24 and the sprocket 22 . Since the transmission portion 12 is connected to the drive shaft of the oil pump 10 , the driving force applied to the transmission portion 12 drives the oil pump 10 . This supplies oil to the internal combustion engine.

A tension acts from the chain 24 to pull the transmission portion 12 in the Z-axis direction. For this reason, a moment acts to vibrate the oil pump 10 in the Z-axis direction with the mounting portion 14 as a fulcrum.

According to the present embodiment, the convex portion 16 protrudes on the side opposite to the transmission portion 12 and contacts the surface of the crankcase 20, thereby suppressing vibration and noise of the oil pump 10. FIG. That is, the tension pulls the transmission portion 12 of the oil pump 10 toward the +Z side. At this time, the oil pump 10 is fixed by the bolts 15 . When the tension becomes small, the transmission part 12 tries to return to the -Z side. At this time, the convex portion 16 abuts against the surface of the crankcase 20 and exerts a firm grip, thereby restricting the movement of the oil pump 10.例文帳に追加Therefore, vibration and noise caused by vibration can be suppressed.

The size and shape of the convex portion 16 can be changed, and it is sufficient that the convex portion 16 protrudes on the side opposite to the transmission portion 12 with respect to the mounting portion 14 . Although the oil pump 10 is fastened to the crankcase 20 by the bolts 15 at the mounting portion 14, it may be fixed by other methods.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations can be made within the scope of the gist of the present invention described in the scope of claims. Change is possible.

REFERENCE SIGNS LIST 10 oil pump 12 transmission part 14 mounting part 15 bolt 16 convex part 20 crankcase 22 sprocket 24 chain

Claims (1)

Attached to the surface of the crankcase of an internal combustion engine,
a transmission section that transmits a driving force from the internal combustion engine as tension in a direction that separates from the surface of the crankcase and pulls toward the surface of the crankcase;
a mounting portion used for mounting the oil pump to the surface of the crankcase and fastened to the crankcase;
an oil pump comprising: a convex projecting portion that contacts a surface of the crankcase and projects in a direction opposite to the transmitting portion with the mounting portion interposed therebetween.

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