JPH0322497Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an oil pump device for an engine.

(Prior art) Conventionally, an oil pump cover through which a crankshaft is inserted is attached to the side of a cylinder block, and a gear chamber for a pump gear driven by the crankshaft is formed in the gap between the pump cover and the side of the cylinder block. An oil pump has been proposed (see Utility Model Application Publication No. 59-91405).

However, in the above conventional oil pump, the pump gear of the oil pump and the sprocket of the transmission member (chain, belt, etc.) that transmits the rotation of the crankshaft to the camshaft are attached to the shaft end of the crankshaft that protrudes from the side of the cylinder block. Otherwise, it was necessary to attach the pulley and crankshaft pulley, which caused the problem that the overall length of the engine became longer.

In order to solve this problem, the present applicant has proposed that a cover member is attached to the side of the cylinder block to cover a transmission member that transmits the rotation of the crankshaft to the camshaft, and the above-mentioned cover member that extends through the cover member is attached to the side of the cylinder block. A gear accommodating recess for a pump gear driven by the crankshaft is provided on the inner surface of the cover member so as to correspond to the recess on the back side of the crankshaft pulley attached to the tip of the crankshaft. The present invention has proposed an oil pump device for an engine, which is provided with a bulge having a bulge formed therein, and the gear housing recess is covered with a rear cover member to form a gear chamber for a pump gear. (Japanese Unexamined Patent Publication No. 62-168908) (Purpose of the invention) The present invention relates to an improvement of an oil pump device proposed by the applicant, and includes an oil discharge port of a rear cover member attached to a cover member; The purpose of this is to reliably prevent oil leakage by devising a connection structure with the oil intake port formed in the cylinder block.

(Structure of the invention) Therefore, in the present invention, a cover member is attached to the side of the cylinder block to cover a transmission member that transmits the rotation of the crankshaft to the camshaft, and a predetermined gap is provided on the inner surface of the cover member. In an oil pump device for an engine, a rear cover member is attached at a distance therebetween, and a gear chamber for a pump gear driven by the crankshaft is formed in a gap between the rear cover member and the cover member,
The crankshaft pulley fixed to the tip of the crankshaft has a recess formed on the cover member side, and the cover member facing the recess has a bulge that fits into the recess of the crankshaft pulley. A concave portion constituting the gear chamber of the oil pump is formed on the inner surface of the rear cover member, and approximately L is integrally formed from the outer surface of the rear cover member.
A tubular oil discharge port is provided at a right angle to the side surface of the cylinder block, and a seal member is fitted to the tip of the oil discharge port. It is characterized by having an oil intake port into which the oil can be inserted.

(Effects of the invention) According to the invention, the oil discharge port of the rear cover member is connected by being inserted into the oil intake port of the cylinder block, so the oil discharge port and the oil intake port are connected face-to-face. When installing the cover member or rear cover member, assembly errors or distortions may create a gap between opposing surfaces, which can easily cause oil leakage. However, since it is a plug-in connection, assembly errors or distortions in the insertion direction are absorbed, and oil leakage is ensured. can be prevented.

In addition, Utility Model Application Publication No. 59-84288 proposes a lubricating oil pump in which both ends of the joint are inserted into both the pump outlet and the gear case inlet through seals. Since it is inserted through seals at both the outlet and the inlet of the gear case, there is a problem with sealing performance (two seals). In addition, the pump outlet is formed by matching the semicircular opening of the case body with the semicircular opening of the case lid, so there is also a problem with sealing performance in this respect.
In the present invention, since the discharge port is integrally provided in the rear cover member, not only is there no problem with sealing performance at one end, but the number of parts is small.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, a crankshaft 2 extending in the longitudinal direction of the engine E is rotatably supported at the bottom of a cylinder block 1 of the engine E. As shown in FIGS.

The shaft end 2a of the crankshaft 2 projects outward from the side surface 4 of the cylinder block 1,
A chain sprocket 6 (not shown in FIG. 1) is fixed to the base of the shaft end 2a with a key.

A cylinder head (not shown) is fixed to the upper part of the cylinder block 1, and a camshaft 8 extending in the longitudinal direction of the engine E is rotatably supported on the cylinder head.

A chain sprocket 9 is fixed to the shaft end of the camshaft 8.

A chain (transmission member) 10 is disposed between the chain sprocket 9 of the camshaft 8 and the chain sprocket 6 of the crankshaft 2.
The rotation of the crankshaft 2 is transmitted to the camshaft 8 via the chain 10.

On the side surface 4 of the cylinder block 1, there is a chain cover (cover member) that covers the chain 10, etc.
12 is attached with bolts 11, .

The lower part of the chain cover 12 has a shaft hole 12a through which the shaft end 2a of the crankshaft 2 passes.
The bearing portion of the crankshaft pulley 13 is loosely fitted into the shaft hole 12a from the outside of the chain cover 12, and is fitted to the tip of the shaft end portion 2a, and is fixed with a key.

An outer recess 13b and an inner recess 13c are formed on the outer and inner surfaces of the crankshaft pulley 13, respectively, and a bolt is screwed into the shaft end 2a of the crankshaft 2 from the outer recess 13b to connect the chain sprocket 6. The crankshaft pulley 13 is set so as not to come off in the axial direction.

Inner recess 13c of the crankshaft pulley 13
The outer periphery of the shaft hole 12a of the chain cover 12 facing the bulge is bulged toward the inner recess 13c, and a recess 12d is formed on the inner surface of the chain cover 12 facing the bulge 12b. , and is covered with a pump cover (rear cover member) 17 that is oil-tightly fixed to the chain cover 12 with bolts 16 to form a gear chamber 19 of a pump gear 18.

A recess 12c is formed at the distal end of the bulge 12b, and a seal member 20 for sealing between the bulge 12b and the bearing of the crankshaft pulley 13 is fitted into the recess 12c.

The pump gear 18 of the gear chamber 19 is fitted and fixed to a bearing portion of the crankshaft pulley 13.

Therefore, when the crankshaft pulley 13 is rotated by the crankshaft 2, the pump gear 18 is also rotated.

The pump cover 17 includes the pump cover 1
A tubular oil discharge port 1 protrudes from the outer surface of the cylinder block 7 in a substantially L-shape and is perpendicular to the side surface 4 of the cylinder block 1.
7a, and a sealing member 22 is fitted into the outer peripheral groove 17b of the oil discharge port 17a.

The side surface 4 of the cylinder block 1 is provided with an oil intake port 4a into which the oil discharge port 17a of the pump cover 17 can be inserted at a predetermined depth. Oil supply passage 4 that supplies oil to passages, etc.
b are connected.

Although not specifically shown, the pump cover 17 is provided with an oil supply section that is connected to an oil supply pipe that sucks up oil in the oil pan.
An oil inlet passage communicating with the gear chamber 19 is formed in the oil supply section.

If the configuration is as above, chain cover 1
2, the inner recess 13 of the crankshaft pulley 13
A bulging portion 12b bulging toward c is provided,
A recess 12d formed on the inner surface of the bulge 12b.
is covered with the pump cover 17, and the pump gear 1
Since the oil pump P is formed as a gear chamber 19 of 8, the oil pump P is installed in a dead space (inner recess 13c) on the back side of the crankshaft pulley 13.

Therefore, it is not necessary to set the length of the shaft end 2a of the crankshaft 2 longer for the oil pump P as in the conventional case.In other words, the length of the shaft end 2a is increased by the thickness of the oil pump P. Since the length can be shortened, the overall length of the engine E can be shortened.

Furthermore, since the oil discharge port 17a provided in the pump cover 17 is inserted and connected to the oil intake port 4a of the cylinder block 1, assembly errors in the insertion direction of the chain cover 12 and pump cover 17 may cause distortion. Also, oil discharge port 1
7a can slide within the oil intake port 4a, so assembly errors are absorbed and oil leakage does not occur.

[Brief explanation of the drawing]

Figure 1 is an enlarged sectional view of Figure 3 of an engine equipped with an oil pump device according to the present invention;
3 is an enlarged sectional view of FIG. 3, and FIG. 3 is a perspective side view of the engine of FIG. 1. 1... Cylinder block, 2... Crankshaft, 4... Side, 4a... Oil intake port, 6, 9... Chain sprocket, 8... Camshaft, 10...
Chain (conduction member), 12... Chain cover (cover member), 13... Crankshaft pulley,
17...Pump cover (rear cover member), 17a
...Oil discharge port, 18...Pump gear, 19...Gear chamber, 22...Seal member, P...Oil pump.

Claims (1)

[Claim for Utility Model Registration] A cover member that covers a transmission member that transmits the rotation of the crankshaft to the camshaft is attached to the side of the cylinder block, and a rear cover is attached to the inner surface of the cover member at a predetermined gap. In an oil pump device for an engine, a gear chamber of a pump gear driven by the crankshaft is formed in a gap between the rear cover member and the cover member, the crank being fixed to the tip of the crankshaft. The shaft pulley has a recess formed on the cover member side, and the cover member facing the recess has a bulge that fits into the recess of the crankshaft pulley, and the oil pump gear is formed on the inner surface of the cover member of the bulge. While a concave portion constituting a chamber is formed, approximately L is integrally formed from the outer surface of the rear cover member.
A tubular oil discharge port is provided at a right angle to the side surface of the cylinder block, and a seal member is fitted to the tip of the oil discharge port. An oil pump device for an engine, characterized in that it is provided with an oil intake port into which an oil can be inserted.