JP2517700Y2 - Baffle plate structure integrated with engine bearing cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a baffle plate structure integrated with a bearing cap of an engine.

(Prior Art) It is known from Japanese Examined Patent Publication No. 57-27969 that a baffle plate having a uniform curved surface in the axial direction along an oil pan shape is integrally formed with a bearing cap in an upright engine.

(Problems to be solved by the invention) However, in the case of a tilted engine, the oil surface of the oil pan is close to the rotation trajectory of the connecting rod and crank weight, and the rotating wind at high rotation directly hits the oil surface, causing oil to foam. Then, aeration of the oil pump occurs or the oil surface fluctuates, so that the crankshaft and the oil come into contact with each other, which causes a decrease in horsepower.

Then, the oil lifted up by the connecting rod or the crankshaft generates blow-by gas containing a relatively large amount of oil component, and this blow-by gas is sent to the intake system, which is not preferable.

Therefore, an object of the present invention is to improve the shape of a baffle plate integrally provided with a cast bearing cap and the opening position of a blow-by gas passage provided in an engine block, particularly in a tilted engine having a plurality of cylinders, so that the connecting rod and Prevents oil bubbles and fluctuations in the oil surface due to the rotating wind of the crank weight to prevent a reduction in horsepower, and prevents the oil from being lifted up by the connecting rod and crankshaft and into the blow-by gas sent to the intake system. (EN) Provided is a bearing cap capable of reducing the content of the oil component.

(Means for Solving the Problems) In order to achieve the above object, the present invention opens a blow-by gas passage in a space surrounded by an oil pan and a crank chamber of an inclined engine with a cylinder shaft largely inclined. A cylinder block having a recess wall with a gas passage inside is formed on the upper side, a bearing cap that supports the crankshaft on the oil pan side of the cylinder block, and a crank chamber that is integrated with this bearing cap to separate the crankcase from the oil pan side space. In the tilting engine including a baffle plate having an oil return hole formed therethrough, the rotating portion of the crankshaft is rotated upward from the lower portion of the baffle plate on the oil pan side in the crank chamber. The baffle plate is curved so as to follow the rotation trajectory, and the oil near the upper part of the baffle plate. The return hole is arranged with its axis oriented in a direction along the oil surface of the oil pan chamber, and extends upward from the opening end of the blow-by gas passage inwardly of the cylinder block in the vicinity of the recess wall. The piece is provided on a baffle plate.

(Operation) In the present invention, the rotating part of the crankshaft is rotated upward from the lower part of the baffle plate on the oil pan side in the crank chamber, and the baffle plate has a curved surface shape along the rotation trajectory of the rotating part in the crank chamber. By penetrating the oil return hole in the vicinity of the upper part, the oil is efficiently discharged from the oil return hole by the rotating operation of the rotating part, so that the oil accumulated in the baffle plate is minimized and the crank chamber The oil scattered to the upper part is reduced, and the upper extending piece of the baffle plate extends inward of the cylinder block from the opening end of the blow-by gas passage. Oil splashes are separated into the crank chamber without scattering to the end side, and the axis of the oil return hole is aligned with the oil pan. Since it is oriented along the oil surface of the chamber, the agitation and bubbling of oil in the oil pan chamber is minimized when the crank weight and connecting rod end rotate, including the effects of oil flow and air flow from the oil return hole. The oil level is kept stable by keeping it at the limit.

(Examples) Examples will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the engine E is mounted on the vehicle in a horizontal direction with a large inclination to the front, and an oil pan 11 for storing oil O is connected to the bottom of the cylinder block 1 by bolts 9 ... As shown in FIG. 2, a plurality of (three in the figure) cylinder bores 2 ... Are provided in the cylinder block 1, and bearing portions 3 ... Are provided below and between both ends of each cylinder bore 2. The oil passage 4 is provided below the bearing 3 on the right side of the center.
Is opened and raised, and recessed walls 5, 5 that open to the lower surface of the cylinder block 1 are provided above the two center bearing portions 3, 3. A blow-by gas passage 6 is formed in each recess wall 5, and further opens to the upper surface of the cylinder block 1 through a volume chamber 7 and a passage 8.

A piston 12 is fitted in each cylinder bore 2, and a journal portion 13 of the crankshaft has bearing portions 3 of the cylinder block 1 and bearing portions of a bearing cap 20 described later.
It is supported among 21. The connecting rod 15 is connected between the piston 12 and the crank pin 14, and the baffle plate
The connecting rod bolt rotation locus having the maximum rotation locus of the rotating portion of the crankshaft including the large end of the connecting rod 15 which rotates in the counterclockwise direction indicated by the arrow from the bottom to the top of 31 and the crank weight (not shown) is indicated by R. Be done. The cylinder head 17 connected to the upper surface of the cylinder block 1 is provided with a passage 18 continuous with the blow-by gas passage 8.

In the above description, the bearing cap 20 is a casting (made of aluminum in the embodiment), and as shown in FIG. 3, the cylindrical portion 22 and the lateral cylindrical portion 24 are obliquely and continuously provided on the lower surface. The insides of the cylindrical portions 22 and 24 are passages 23 and 25 for oil sent from an oil pump (not shown). The bearing cap 20 is integrally provided with a baffle plate 31.

That is, curved surface-shaped portions 32 are formed between the bearing cap bearing portions 21 along the connecting rod bolt rotation locus R. The curved surface-shaped portion 32 extends to the side of the lower extending piece 33 and the recess wall 5 that rises in the forward direction almost in contact with the oil surface L, and extends inward of the cylinder block 1 from the opening end 6a of the blow-by gas passage. And an upper extension piece 34 that extends. Both sides of the extending pieces 33, 34 of the curved surface shaped portion 32 are rising portions 33a, 34a along a crank weight rotation locus smaller than the connecting rod bolt rotation locus R.

In this way, the baffle plates 31 for each cylinder are integrally formed with the bearing cap 20, and the crank chamber A is partitioned from the lower oil pan chamber B.

Further, on the upper side of each curved surface shaped portion 32 ...
24 Open an elongated oil return hole 35 ... Horizontally along the top.
Further, the two blow-by gas passages 6,6 formed between the cylinders of the cylinder block 1 are the upper extension pieces via the recess walls 5,5.
Oil pan 1 from baffle plate 31… between the tops of 34,34
It opens to the oil pan chamber B on the 1st side. 6a is the opening end of the blow-by gas passage.

The bearing cap 20 having the above baffle plates 31 ... Is joined to each bearing portion 3 in the cylinder block 1 in each bearing portion 21 from below by two front and rear bolts 29.

Since the baffle plate 31 is provided for each cylinder in this manner, the curved surface shape portions 32 (the lower extension piece 33 and the upper extension piece 34) that are close to each other along the rotation locus R of the connecting rod 15 and the like are operated during engine operation. Since it is possible to prevent the oil bubbling and the fluctuation of the oil surface L due to the rotating wind at the time of high rotation, the reduction of the horsepower is suppressed as much as possible. Then, oil is prevented from being lifted up by the connecting rod 15 and the crankshaft, and blow-by gas is sent from the blow-by gas passages 6, 6 ... Opened from the baffle plate 31 to the oil pan 11 side to the intake system through the valve operating chamber. The content of the oil component of is reduced as much as possible. Further, the wind coming out of the oil return hole 35 opened at the upper part of the curved surface shaped portion 32 does not hit the oil surface L and the inner surface of the baffle plate 31 because the axis of the oil return hole is directed along the oil surface of the oil pan chamber. The oil attached to the oil is returned to the inside of the oil pan 11 from the oil return hole 35 by the action of the rotating wind.

By the way, the oil flowing out from the connecting rod bearing portion and the crankshaft bearing portion is transmitted along the crankshaft by the rotation of the crank and scattered in all directions. The splashed oil is received by the baffle plate 31, and the received oil has a hollow central portion of the baffle plate 31, which prevents the oil from flowing out from both sides.

Incidentally, the number of cylinders is not limited to three cylinders, and may be plural.

(Effect of the Invention) As described above, according to the present invention, the rotating part of the crankshaft is rotated from the lower part of the baffle plate to the upper part thereof on the oil pan side in the crank chamber, and the baffle plate follows the rotation locus of the rotating part in the crank chamber. By forming a curved surface and penetrating the oil return hole in the vicinity of the upper part, the oil is efficiently discharged from the oil return hole by the rotating operation of the rotating part, so the oil accumulated in the baffle plate is minimized. It is suppressed and the oil scattering to the upper part of the crank chamber is reduced, and the upper extension piece of the baffle plate extends inward of the cylinder block from the opening end of the blow-by gas passage, so the oil scraped up is Oil splashes are separated in the crank chamber without scattering to the open end of the blow-by gas passage, and the oil return hole Since the axis of is oriented along the oil surface of the oil pan chamber, the oil flow in the oil pan chamber when the crank weight and connecting rod end rotate, including the effect of the oil flow and air flow from the oil return hole. Stirring and bubbling are suppressed to a minimum and the oil level is secured.

Therefore, the baffle plate structure of the present invention prevents the aeration of the oil pump by reducing the agitation and foaming of the oil, prevents the engine output from decreasing by avoiding the contact between the crank part and the oil surface, and improves the bearing cap rigidity. In addition to improving the service life and the ease of assembly by reducing the number of parts, we aim to improve combustion by stabilizing the oil surface and reducing the amount of scattered oil and separating it to minimize the mixing of oil in blow-by gas. This can solve the problems specific to tilting engines.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main part of an inclined engine to which the present invention is applied, FIG. 2 is a bottom view inside a cylinder block, and FIG. 3 is a bottom view of a bearing cap according to the present invention. In the drawings, 1 is a cylinder block, 6 is a blow-by gas passage, 6a is an open end, 11 is an oil pan, 15 is a connecting rod, 20 is a bearing cap, 21 is a bearing part, 31 is a baffle plate, and 32 is a curved surface shape. Reference numeral 35 is an oil return hole, A is a crank chamber, B is an oil pan chamber, E is an engine, L is an oil surface, and R is a connecting rod bolt rotation locus.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Hideyuki Hiranuma 1-4-1 Chuo, Wako-shi, Saitama Honda R & D Co., Ltd. (56) References JP-A-58-200018 (JP, A) JP-A-SHO 61-185609 (JP, A)

Claims (1)

(57) [Scope of utility model registration request] 1. A cylinder in which a blow-by gas passage is opened in a space surrounded by an oil pan and a crank chamber of an inclined engine in which a cylinder shaft is largely inclined, and a recess wall in which the blow-by gas passage is provided is formed in an upper portion. A block, a bearing cap that supports the crankshaft on the oil pan side thereof, and a baffle plate that is integral with the bearing cap to partition the crank chamber from the oil pan side space and through which an oil return hole is formed. In the inclined engine, the rotating part of the crankshaft is rotated from the lower part of the baffle plate to the upper part thereof on the oil pan side in the crank chamber, and the baffle plate is formed into a curved shape along the rotation locus of the rotating part. Align the oil return hole near the top with its axis aligned with the oil level in the oil pan chamber. A bearing for an engine characterized in that the baffle plate is provided with an upper extension piece that is disposed facing toward and that extends inwardly of the cylinder block from the opening end of the blow-by gas passage near the recess wall. Baffle plate structure with integrated cap.