KR950000329Y1 - Rear-cover of engine - Google Patents

Abstract

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Description

Engine rear cover structure

1 is a view of the cylinder block to which the rear cover structure of the engine according to the present invention is applied from the crank chamber side.

2 is a plan view of FIG. 1 showing an output side wall surface;

* Explanation of symbols for the main parts of the drawings

10: cylinder block 18: oil return passage

19: communication path 20: mounting flange (mounting seat of the mission case)

22: Screw seat (mission case tightening position)

30: rear cover 35: oil passage

The present invention relates to a rear cover structure of an engine mounted on the cylinder convex outer wall, which is the output side of the engine body, for hermetically projecting the output shaft.

The engine of a vehicle is largely comprised so that the cylinder head may be mounted above the cylinder block, and the oil pan may be mounted below (refer Japanese Unexamined-Japanese-Patent No. 58-109539 etc.).

The oil return passage penetrates the cylinder block in the vertical direction, and the lubricating oil supplied to the cylinder head is returned to the oil pan via the oil return passage. Such an oil return passage is formed in a portion to which the bulkhead forming the journal bearing portion for supporting the crankshaft is attached, due to the arrangement space thereof.

On the other hand, in an engine in which transmissions are connected in series with the output shaft, the output shaft is configured to hermetically penetrate the rear cover mounted on the output side outer wall of the cylinder block from the engine body and project toward the transmission.

However, in order to increase the circulation efficiency of the oil, it is preferable that the oil is returned to the oil pan quickly, and the area of the oil return passage is required to be as large as possible (large or numerous in diameter).

However, since the oil pan is attached to the lower portion of the cylinder block along the outer circumferential portion via the sealing member, in the configuration in which the oil return passage is formed in the portion where the bulkhead is attached as in the conventional art, the cylinder on the output side There was a problem that the oil return passage could not be formed in the outer wall portion of the block.

That is, even if the oil return passage is formed in the thickness of the cylinder block outer wall on the output side, the oil return passage interferes with the seal member provided at the junction between the end face of the cylinder block outer wall and the oil pan. It cannot be communicated. It is also possible to avoid this problem by forming the oil return passage to bypass the seal member. However, the oil return passage is complicated by the formation of the mission case mounting sheet for mounting the mission case on the outer wall of the cylinder block. It is inevitably bent, and the problem that a core does not fall out at the time of shaping arises.

In addition, the cylinder block is formed by widening its lower side (crank chamber side) to open, and at the end of the output side by forming a large diameter flywheel and a joint case of the mission case covering the clutch portion in the width direction. Because of that, the rigidity will be insufficient.

In view of the above, the present invention enables the formation of an oil return passage on the outer wall of the cylinder block on the output side, thereby increasing the passage area and improving the rigidity of the cylinder block. To provide a structure.

For this reason, in the rear cover structure of the engine which concerns on this invention, the rear cover of the outer shape which conforms substantially to the external shape of the installation seat of the mission case attached to the said output outer wall is attached to the output side outer wall of a cylinder block, The rear cover The oil passage is formed between the cylinder block and the outer wall of the cylinder block in an arc shape centered on the output shaft, and communicates with the oil return passage from the cylinder head formed in the cylinder block on the output outer wall of the cylinder block. A communication path to be formed is formed.

According to this configuration, the rear cover can function as a reinforcing member of the cylinder block, improve the rigidity of the cylinder block, suppress the deformation of the cylinder block, and at the same time, an oil return passage can be formed on the outer wall of the cylinder block. It is possible to increase the passage area of the oil return passage.

Further, the rear cover is connected to a communication path communicating with the cylinder block and an oil pan mounted below the cylinder block while being tightened to the cylinder block at a position corresponding to the mission case tightening position to the cylinder block. Consists of.

In this configuration, the rear cover can be firmly mounted by tightening the rear cover at a position corresponding to the mission case tightening position formed with high rigidity, and the rigidity of the cylinder block can be further improved, and the lower block The oil can be smoothly refluxed from the cylinder head to the oil pan via the valve.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing.

FIG. 1 is a view of the cylinder block to which the engine's rear cover structure according to the present invention is applied, as seen from the crank chamber side as the upper side in the drawing as an output side, and FIG. 2 is a view showing the output side wall surface as its plan view.

The display cylinder block 10 is a cylinder block of a four-cylinder in-line engine, and the crank chamber between the cylinders 11 ... is blocked by the bulkheads 13, 14, and 15, and Journal bearings 17 are formed on the bulkheads 13, 14, and 15, and the outer walls 12, 16 of the front and rear (up and down in the figure), respectively.

By the vertical height of the bearing cap mounting surface 17A of the journal bearing portion 17 and the journal bearing portion 17, the degree of support coincides with the center of the crank side (not shown), and the periphery of the cylinder block 10 is shown. The lower end portion 10A of the outer wall has a predetermined amount lower than this, and the lower block 10A of the lower end portion is mounted, and an oil pan (not shown) is mounted below the lower block.

The side wall of the bulkheads 13, 14, and 15 has no thickness at a predetermined depth (height direction) than the journal bearings, so that the hollow spaces 13A, 14A, and ( 15A) and the spaces 13A and 15A on one side of the bulkheads 13 and 15 before and after the center bulkhead 14 are proposed, and the upper surfaces of the cylinder blocks 10 are respectively. It communicates with the oil return passage 18. The oil lubricated by the cylinder head thereby passes through the oil return passage 18, reaches the spaces 13A, 15A, and returns to the oil pan.

The front wall 12 is provided with an oil return passage 18F having the inner surface of the front wall 12 at a substantially center position. The oil return passage 18F opens the inner surface of the front wall 12 (i.e., the crank chamber side), and oil from the cylinder head via the oil return passage 18F passes through the inner surface of the front wall 12. It is supposed to return to the fan.

In the rear wall 16, an oil return passage 18R is formed at the center of the plate thickness at a predetermined depth from the upper surface of the cylinder block 10, and the oil return passage 18R is connected to the communication passage 19. Is communicated to the rear cover long sheet 23 described later on the rear wall.

On the rear end of the cylinder block 10, a mounting flange 20 for tightening and connecting a mission case covering a transmission connected through a large diameter flywheel or clutch formed at the rear end of the engine is formed to protrude to the side. The flange 20 and the front side wall of the future are connected to the outer surface 20A of the raper shape, and the inside thereof is hollow.

The mounting flange 20 is a substantially semi-circular shape centering on the output shaft, and a plurality of circular screw sheets 22 are formed with a joining contact surface 21 along the outer circumference and a screw hole formed in the center thereof. Formed.

In addition, a rear cover mounting sheet 23 having a diameter smaller than that of the joining contact surface 21 is formed on the inner circumferential side of the joining contact surface 21, so that the rear cover 30 is a screw sheet of the mounting flange 20. The inner circumferential side corresponding to 22 is attached by a screw 24 which is screwed into position at the center of the output shaft. The rear cover 30 is mounted in a state where the crank shaft is mounted, but for convenience the crank shaft In addition, the piston is not displayed, and the state in which only the rear cover 30 is mounted on the cylinder block 10 is displayed.

In addition to the same semicircular outer shape as the rear cover mounting sheet 23, the rear cover 30 is integrally formed with a ring-shaped seal bearing portion 31 through which the output side is inserted, and along the outer periphery of the cylinder block 10. Screw seat 32 is formed at a position corresponding to the tightening screw hole 23A ... of the rear cover mounting sheet 23, and the screw sheet 32 and the seal bearing portion 31 are plural. Rigid 33 is connected to the upper rib 33 to secure rigidity. Moreover, from the opening part of the communication path 19 opening to the rear cover mounting sheet 23 of the cylinder block 10, the cross-sectional U-shaped oil groove 34 is formed in circular arc shape centering on an output shaft, The wall portion forming the oil groove 34 also connects the ribs 33 to contribute to the improvement of rigidity.

The oil groove 34 forms an oil passage 35 between the rear wall surface (rear cover mounting sheet 23 surface) of the cylinder block 10, and the oil passage 35 has a rear cover 30. The lower end surface of the cylinder block 10 (the lower end of the cylinder block 10 is flush with the edge 10A) is opened. The opening of the oil passage 35 is connected to an oil return passage communicating with an oil pan formed in a lower block (not shown) mounted below the cylinder block 10.

That is, according to the above configuration, in the state where the rear cover 30 is attached to the rear cover mounting sheet 23 of the cylinder block 10, the oil passage 35 and the oil return passage 18R of the cylinder block 10 are provided. The oil communicates via the communication path P, and the oil returned to the oil return path 18R after lubrication of the cylinder head is connected between the cylinder block 10 and the rear cover 30 via the communication path 19. When the oil passage 35 is formed, the oil passage 35 passes through the lower end portion of the cylinder block 10 to the outside of the edge and the oil return passage of the lower block returns to the oil pan.

And, according to the configuration of the rear cover 30 as described above, by forming the oil passage 35 on the cylinder block 10 side of the rear cover 30, the oil passage 35 between the oil pan and the sealing member The lower end of the cylinder block 10, which is interposed therebetween, may be in a position deviated from the edge, and the oil passage 35 may be formed by avoiding interference with the sealing member.

In addition, when the oil return passage 18R of the cylinder block 10 is disposed on the side of the crankshaft rotational direction, due to the configuration of the engine, the oil passage 35 formed in an arc shape around the output shaft is provided. The oil can be returned to the opposite side (that is, the scraping direction of the crank side in the rotational direction), whereby the crank side draws oil and prevents the occurrence of bubbles. In this embodiment, the oil passage 35 and the oil return passage of the lower block (not shown) are returned to the scraping direction of the crank shaft of the oil pan in the improved direction. The other oil return passages 18, 18F are arranged on the side of the crank-side scraping direction, but the amount of oil returning from the cylinder head is the most from the end, and the oil pan Since the output side is configured to be shallow, it is most effective to prevent the occurrence of bubbles by returning the oil on the output side to the scraping direction in the rotational direction of the crankshaft.

Further, the rear cover 30 has a large shape along the inside of the joining contact surface 21 of the mounting flange 20, and at the same time, a screw seat for tightening the mission case at the tightening position to the cylinder block 10 ( The rear cover 30 can reinforce the mounting flange 20 which is enlarged in a tapered shape at the rear of the cylinder block 10 and opens downward by being in a position corresponding to 22). The rigidity of the cylinder block 10 can be improved by suppressing the opening and closing deformation.

According to the rear cover structure of the engine according to the present invention as described above, the rear cover functions as a reinforcing member of the cylinder block to improve the rigidity of the cylinder block, and to suppress the deformation of the cylinder block and at the same time the engine body The oil return passage can also be formed on the outer wall of the cylinder block on the output side of the output, and the passage area of the oil return passage can be increased.

Claims (2)

On the output side outer wall of the cylinder block 10, a rear cover 30 having an outer shape substantially conforming to the outer shape of the mounting sheet of the mission case attached to the output side outer wall is mounted, and the rear cover 30 and the cylinder block ( 10) The oil passage 35 is formed in an arc shape centered on the output side between the outer wall and at the output side outer wall of the cylinder block 10 from the cylinder head formed in the cylinder block 10. An oil return passage (18R) and a communication passage (19) for communicating the oil passage (35) are formed and configured, the rear cover structure of the engine. The cylinder block (10) and its rear cover (30) are fastened to the cylinder block (10) at a position corresponding to the mission case tightening position to the cylinder block (10). The lower block is interposed between the oil pan mounted below the cylinder block 10, and the oil passage 35 is connected to the communication passage 19 communicating with the oil pan formed at the lower block. The rear cover structure of the engine characterized by the above-mentioned.