JPH05272319A - Engine structure - Google Patents

Abstract

PURPOSE:To keep engine lubricating oil at a proper temperature by means of engine cooling water. CONSTITUTION:A recessed part opened on the overall surface while extending in the cylinder row direction is formed in the side part of a cylinder block upper 3y of an engine, and a large number of bolt seats are formed on the outer periphery of the recessed part and in a condition where a water cover 71 is arranged so as to cover the recessed part, bolts are inserted into the bolt seats, so that a water rail 70 can be formed. A main gallery 50 extending in the cylinder row direction to flow lubricating oil is arranged under the water rail 70. This main gallery 50 and the water rail 70 are arranged in parallel with each other as well as in close vicinity above and below to each other. Ribs continued to the main gallery are arranged in the bolt seats opposing to the main gallery 50 among the large number of bolt seats situated on the outer periphery of the recessed part of the cylinder block upper 3y, and heat exchange is carried out through the ribs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine structure, and more particularly to a measure for optimizing an engine lubricating oil temperature using engine cooling water.

[0002]

2. Description of the Related Art Conventionally, as a water jacket structure for engine cooling water, for example, Japanese Patent Laid-Open No. 1-134052 has been proposed.
As disclosed in Japanese Patent Publication No. JP-A-2003-264242, a plurality of cylinder liners are provided with cooling water passages on the outer periphery thereof, and water rails extending in the cylinder row direction are provided on the side portions of the cylinder block. A plurality of communication passages that communicate with the cooling water passages are provided to supply the cooling water to the water rail, and then the cooling water is supplied to the cooling water passages on the outer periphery of each cylinder liner through the respective communication passages.
A so-called wet liner type in which a plurality of cylinder liners are directly cooled by engine cooling water is known.

[0003]

By the way, in the conventional engine, the specific heat of the engine lubricating oil is higher than the specific heat of the engine cooling water. Therefore, during the warm-up operation of the engine, the engine cooling water is heated to an appropriate temperature early. Although it rises, the temperature of the lubricating oil rises slowly, and the higher the viscosity of the lubricating oil, the lower the good engine lubricating performance. On the other hand, when the engine temperature is high, the engine cooling water is cooled well by the radiator, but a cooling device for the lubricating oil is not generally equipped and the lubricating oil is maintained at a high temperature, which reduces the engine lubricating performance. To do.

The present invention has been made in view of the above problems, and an object thereof is to provide a water rail extending in the cylinder row direction at a position on the side of a cylinder block as in the above-described conventional engine structure. , Paying attention to the point that the main gallery of engine lubricating oil also extends in the cylinder row direction, and by making it possible to exchange heat between the two, by increasing the lubricating oil temperature early during engine warm-up operation, When the temperature is high, the lubricating oil temperature is appropriately lowered to improve the lubricating performance of the engine.

[0005]

In order to achieve the above object, in the invention according to claim 1, a cooling water passage extending in the cylinder row direction and through which engine cooling water flows, and a lubricating oil for the engine extending in the cylinder row direction. On the premise of an engine structure in which both the main gallery and the main gallery that circulate are arranged at a lateral position of the cylinder, the cooling water passage and the main gallery are arranged substantially parallel to and close to each other in the cylinder row direction, and the cooling is performed. A heat transfer member that transfers heat between the engine cooling water in the cooling water passage and the lubricating oil in the main gallery is arranged in a space between the water passage and the main gallery.

According to the invention of claim 2, the cooling water passage and the heat transfer member of the invention of claim 1 are specified.
The cooling water passage is formed above the main gallery and is formed by a recess formed on the side surface of the cylinder block and a cover member covering the recess, and the heat transfer member is a bolt for mounting the cover member on the side surface of the cylinder block. It is composed of ribs extending from the bolt seat.

Further, in the invention according to claim 3, the cooling water passage extending in the cylinder row direction of the invention according to claim 1 is specified, and the cooling water passage is formed so as to communicate with the cooling water passage formed on the outer periphery of the cylinder liner. To do.

[0008]

With the above construction, in the inventions according to claims 1 to 3, during engine warm-up operation, the amount of heat of the engine cooling water, which has become high in the cooling water passage such as the water rail at an early stage, is increased by the rib. Since it is transferred to the low temperature lubricating oil in the main gallery through the heat transfer member such as the above, the temperature rise of the lubricating oil is promoted and the engine lubrication performance during the warm-up operation is improved.

Further, when the engine is at a high temperature, the heat quantity of the lubricating oil at a high temperature in the main gallery is transmitted to a heat transfer member such as a rib and radiated to a low temperature engine cooling water in a cooling water passage such as a water rail. Therefore, the lubricating oil is cooled well, and the lubricating performance is improved.

According to the second aspect of the invention, since the heat transfer member is constituted by the rib extending from the bolt seat of the cover member for forming the cooling water, a small and lightweight heat transfer member is sufficient. , Does not significantly increase the weight of the engine.

[0011]

As described above, according to the engine structures of the first and third aspects of the present invention, the cooling water passage extending in the cylinder row direction and the main gallery of the lubricating oil are arranged substantially parallel to each other. Then, the heat transfer member arranged in the space between the two gives heat quantity of the engine cooling water to the engine lubricating oil during engine warm-up operation, while radiating the heat quantity of the lubricating oil to the low temperature engine cooling water at the time of high engine temperature. Therefore, regardless of the temperature condition of the engine, the temperature of the lubricating oil can be brought close to an appropriate temperature to improve the engine lubricating performance.

In particular, according to the second aspect of the invention, the heat transfer member is constituted by the rib extending from the bolt seat of the bolt for mounting the cooling water passage forming cover member on the side surface of the cylinder block. By limiting it to a small value, the increase in engine weight can be suppressed to a small level.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show the powertrain structure of a front-wheel drive vehicle. In each of the drawings, 1 is a vehicle hood, and 2 is an engine room formed below the hood 1. A multi-cylinder engine 3 is arranged in the engine room 2, and the engine 3 has a crankshaft 3a positioned in the vehicle width direction and is horizontally arranged in the vehicle width direction. As shown in FIG. 1, the engine 3 is arranged so as to be inclined rearward of the vehicle body, the intake port 3b is located on the front side of the vehicle body, and the exhaust port 3c is located on the rear side of the vehicle body. An intake pipe 4 extending forward of the vehicle body is connected to the intake port 3b, and an exhaust pipe 5 is connected to the exhaust port 3c. The exhaust pipe 5 is arranged so as to extend obliquely rearward and downward.

In the engine 1, the intake port 3b
And the combustion chamber 6 in which the exhaust port 3c is opened is the cylinder 3
A piston 7 fitted in a liner 3f having a predetermined cooling water passage 3e on the inner periphery of d has a variable volume, and an intake valve 8 and an exhaust valve 9 are arranged. Camshafts 10 and 11 are arranged above the intake valves 8 and the exhaust 9, and each of the shafts 10 and 11 is of a two-stage type that drives a driven sprocket 10a arranged at the left end portion thereof, as shown in FIG. It is rotationally driven by the crankshaft 3a through the chains 12 and 13.

Behind the engine 3, for example, forward 5
A manual transmission 20 having one gear and one reverse gear is arranged. In the engine room 2, the transmission 20 has an input shaft (not shown) and an output shaft 20b arranged in a straight line following the input shaft both positioned in parallel with the crankshaft 3a of the engine 3. Is located in.

A drive shaft (not shown) is arranged below the transmission 20 so as to extend in the vehicle width direction, and a differential 28 is arranged on the drive shaft as shown in FIG. ..

Further, the engine 3 is, as shown in FIG.
The cylinder head portion 3x is divided into a cylinder block upper 3y located above a line connecting the crankshaft 3a and the axis of the drive shaft, and a cylinder block lower 3z, and an oil pan is formed on the lower surface of the cylinder lower block 3z. 30 is connected.

An oil pump 31 for engine lubrication is provided around the oil pan 30 as shown in FIGS. 2 and 3.
Are arranged. The drive system of the oil pump 31 is shown in FIG.
As will be described on the basis of FIG. 3, a power take-out gear 33 is coaxially and integrally rotatably arranged on the crankshaft 3a of the engine 3, and an idle gear 34 that meshes with the gear 33 is provided below the power take-out gear 33. Are placed. Furthermore,
A drive side sprocket 37 is integrally formed on a support shaft 35 that supports a bearing portion 34a of the gear 34 that is integrally formed with the idle gear 34, and below the support shaft 35, a drive shaft sprocket 37 is provided in parallel with the support shaft 35. The machine drive shaft 38 is arranged, the driven side sprocket 39 is integrally formed with the auxiliary machine drive shaft 38, and the chain 4 is provided between the both sprockets 37, 39.
0 is wound around, and the gear type oil pump 31 is arranged at the end of the accessory drive shaft 38. The oil pump 31 is rotationally driven via the accessory drive shaft 38 by the rotation of the crankshaft 3a. It is a configuration that does.

The oil pump 31 has an oil suction port 31c on the left side of FIG. 2 and an oil discharge port 31d on the upper end. Further, in the oil pan 30, an oil passage 45 communicating with the oil discharge port 31d and extending in the left-right direction in the drawing is formed, and a vertical oil passage 46a communicating with the oil passage 45 and extending in the vertical direction is formed. An oil filter (not shown) is arranged around the lower ends of the oil passage 45 and the vertical oil passage 46a, and the filtered lubricating oil is supplied to the vertical oil passage 46a.

On the other hand, as shown in FIGS. 2 and 3, the cylinder block lower 3z and the cylinder block upper 3y of the engine 3 are respectively provided with vertical oil passages 46b and 46c which communicate with the vertical oil passage 46a. It is formed. Further, the cylinder block upper 3y is horizontally formed with a main gallery 50 having an opening at the upper end portion 46d of the vertical oil passage 46c. The main gallery 50
Are formed to extend in the row direction of the four cylinders 3d of the engine 3. As shown in FIG. 2, a plurality of oil passages 51 for supplying lubricating oil to the plurality of bearing portions of the crankshaft 3a of the engine 3 communicate with the main gallery 50 at positions corresponding to the bearing portions. , Main gallery 5
Part of the lubricating oil supplied to the respective oil passages 51
Is supplied to each bearing of the crankshaft 3a.

The cylinder block upper 3y includes:
As shown in FIG. 3, an oil passage 55 extending upward is formed at the engine front end position of the main gallery 50, and the oil passage 55 communicates with an oil passage 56 formed in the cylinder head portion 3x in the vertical direction. There is. The upper end of the oil passage 56 of the cylinder head portion 3x communicates with a horizontal oil passage 57 extending in the cylinder row direction at a height position near the two camshafts 10 and 11, and is supplied to the horizontal oil passage 57. The lubricating oil thus supplied is supplied to the valve train for lubrication.

Further, as shown in FIG. 3, an oil passage 58, which opens to the portion where the driven sprocket 10b having a two-stage structure for driving the camshaft is arranged, communicates with the oil passage 56 of the cylinder head portion 3x. The two-stage chains 12 and 13 for driving the camshaft are lubricated by the lubricating oil supplied from the oil passage 58.

Next, the engine cooling system will be described. 1, in the cylinder block upper 3y, a water rail 70 as a cooling water passage extending in the cylinder row direction is arranged at a front position of the cylinder 3d on the vehicle body.
The water rail 70 includes the cylinder block upper 3
The front end portion of y is cut out to form a concave portion that opens forward of the vehicle body, and a war cover 71 as a cover member having a concave cutout portion facing the cutout portion is provided on the cylinder block upper 3y with a large number of bolts 73 ... Consists of using.

As shown in FIGS. 2 and 4, the water cover 71 is discharged from the cooling water discharge port 90a of the water pump 90 connected to the end of the accessory drive shaft 38 at a position near the oil pump 31. A cooling water pipe 75 through which the engine cooling water flows is connected to the lower portion so that the engine cooling water flows in.

Further, as shown in FIG. 1, the water rail 70 is provided with a cooling water supply port 76 communicating with the cooling water passage 3e on the outer circumference of each cylinder liner 3f, which is formed by notching a portion facing each cylinder 3d. A cooling water passage 78 is formed in the cooling water passage 3e on the outer periphery of each cylinder liner 3f and communicates with the rear upper part of the vehicle body to guide the cooling water to the cylinder head 3x.

As shown in FIG. 5, when the cylinder block upper 3y is viewed from the front of the vehicle body, the water rail 70 is arranged above the main gallery 50 and in the cylinder row direction with respect to the main gallery 50. Are arranged substantially parallel to each other and close to each other,
A large number of bolts 7 for attaching a water cover 71 to the side surface of the cylinder block upper 3y forming the water rail 70 are provided on the outer peripheral portion of the recess of the cylinder block upper 3y.
.. are formed, and six rib seats 80 located on the main gallery 50 side are provided with six ribs extending from the respective bolt seats 80 and connected to the outer wall of the main gallery 50. 81 ... Is formed. Therefore, the 6
The ribs 81 are arranged in the outer space between the water rail 70 and the main gallery 50 by the individual ribs 81, and heat transferred between the engine cooling water flowing through the water rail 70 and the lubricating oil flowing through the main gallery 50. It constitutes a transmission member.

In FIG. 3, reference numeral 65 is a cooling water pipe for returning the engine cooling water from the engine 3 to the thermostat 66, and 67 is the cooling water from the vehicle-mounted heater to the thermostat 66.
It is a cooling water pipe to be returned to.

As shown in FIGS. 2 and 6, the oil pan 30 has an oil passage 45a as a flow passage for the lubricating oil, which communicates with the oil discharge port 31d of the oil pump 31 and extends in the vehicle width direction. An oil passage 46a extending upward is formed at the left end position of the oil passage 45a in FIG. 6, and a cooling water passage 76 is formed just above the oil passage 45a extending in the vehicle width direction. Even in the oil pan 30, heat exchange is possible between the cooling water passage 76 and the oil passage 45a.

Further, although not shown, an auxiliary machine is arranged diagonally below and rearward of the front end of the engine 3, and the auxiliary machine is driven to drive the auxiliary machine.
A chain is wound between the front end of the crankshaft 3a and the above-mentioned auxiliary machine. Due to this relationship, as shown in FIG. A wide gap t is generated, and the main gallery 50 is provided for this gap t.
The lubricating oil is supplied through the oil passage 51, and the oil supplied into the gap is supplied through the oil jet 52 to the accessory drive chain for lubrication.

Therefore, in the above embodiment, when the engine 3 is in operation, the lubricating oil is supplied to the main gallery 50.
The engine cooling water is supplied to the valve train or the like via the water rail 70 and flows into the cooling water passage 3e on the outer circumference of each cylinder liner 3f, and each cylinder liner 3f is directly cooled by the engine cooling water.

Here, the main gallery 50 and the water rail 70 are substantially parallel and close to each other in the cylinder row direction, and the water cover 7 is provided in the external space between them.
1. Six ribs 81 extending from the six bolt seats 80 for mounting to the lower side of the vehicle body are arranged, and the cylinder block upper forming the water rail 70 and the outer wall forming the main gallery 50 by the ribs 81. Since the outer wall of the recessed portion 3y is connected, the heat quantity of the engine cooling water in the water rail 70, which has become high temperature, during the warm-up operation of the engine 3 passes through the ribs 81 and the main gallery 50.
It is given to the lubricating oil inside, and the temperature of the lubricating oil rises quickly, and good lubrication of the engine 3 is secured at an early stage. Further, when the engine 3 is at a high temperature, the heat amount of the high temperature lubricating oil in the main gallery 50 is radiated to the low temperature engine cooling water in the water rail 70 via the ribs 81 ... However, the lubrication performance of the engine 3 is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a power train structure as viewed from the left side.

FIG. 2 is a cross-sectional view of the same power train structure cut on the other side.

FIG. 3 is a diagram showing a lubrication system of an engine.

FIG. 4 is a cross-sectional view around the crankshaft and the oil pan of the engine.

FIG. 5 is a front view of a cylinder block upper showing a positional relationship between a water rail and a main gallery.

FIG. 6 is a diagram showing a positional relationship between a lubricating oil passage and an engine cooling water passage in an oil pan.

FIG. 7 is a cross-sectional view of essential parts showing the periphery of an oil jet of a crankshaft.

[Explanation of symbols]

 3 Engine 3e Cooling water passage around cylinder liner 3y Cylinder block upper 31 Oil pump 50 Main gallery 70 Water rail (cooling water passage) 71 Water cover (cover member) 80 Bolt seat 81 Rib (heat transfer member)

Claims (3)

[Claims] 1. An engine structure in which a cooling water passage extending in the cylinder row direction and through which engine cooling water flows, and a main gallery extending in the cylinder row direction and through which lubricating oil for the engine flows are arranged in lateral positions of the cylinder. The cooling water passage and the main gallery are arranged substantially parallel to and close to each other in the cylinder row direction, and the engine of the cooling water passage is provided in the space between the cooling water passage and the main gallery. An engine structure characterized in that a heat transfer member for transferring heat between cooling water and lubricating oil of a main gallery is arranged. 2. The cooling water passage is disposed above the main gallery and is formed by a recess formed on the side surface of the cylinder block and a cover member covering the recess, and the heat transfer member is the cover. The engine structure according to claim 1, wherein the engine structure comprises a rib extending from a bolt seat of a bolt for mounting the member on the side surface of the cylinder block. 3. The cooling water passage extending in the cylinder row direction,
The engine structure according to claim 1, wherein the engine structure communicates with a cooling water passage formed on the outer periphery of the cylinder liner.