JPH05240059A - Engine cylinder block reinforcing structure - Google Patents

Abstract

PURPOSE:To prevent a lubricating oil in an oil pan from being deteriorated by interrupting a intense heat in a catalytic burner for combustion emission controlling. CONSTITUTION:This is a cylinder block reinforced structure of an engine, wherein a reinforced member connected to a cylinder block 1b and a transmission 3 is installed in the lower part of a coupling part between both of them, and this reinforced member is set up in place beneath the coupling part and another reinforced member (integrated stiffener) 2 in the lower part of an oil pan 10, respectively, and in the lower part, there is provided a catalytic burner C for combustion emission control use. This reinforced member 2 is formed into a double structure with a cavity inside, and there is provided a vent hole conducting a running wind run past this cavity into spots around the catalytic burner C, while further an insulating plate 2a is installed in a space between the reinforced member 2 and the catalytic burner C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reinforcing a cylinder block of an engine, and more particularly, it can shield radiant heat generated by a catalyst device for purifying combustion exhaust gas, which is arranged below the cylinder block, to protect the cylinder block. The present invention relates to an improved cylinder block reinforcing structure.

[0002]

2. Description of the Related Art Conventionally, a reinforcing structure of an engine cylinder block as disclosed in JP-A-64-8344 is known. FIG. 5 is an explanatory view in side view for explaining such a reinforcing structure. As shown in this figure, a cylinder part 1 of an engine E (which exemplifies a horizontally placed engine) comprises a cylinder block 1b and a skirt part 1c continuing to the lower part of the cylinder block 1b. An oil pan 10 including a shallow pan 10a and a deep pan 10b is provided. A transmission 3 is connected to the left side of the cylinder portion 1 in the vehicle width direction (in FIG. 5, the laterally extending direction is the vehicle width direction. The same applies to FIGS. 1 to 3 below).

Due to the layout relationship between the cylinder portion 1 and the transmission 3, the transmission 3 is in a state in which approximately one third of the lower portion of the transmission 3 is out of the cylinder portion 1. Due to the presence of this protruding portion, the joint between the cylinder portion 1 and the transmission 3 was not necessarily strong. A stiffener member 11 having a shape is adopted. By doing this,
The coupling rigidity between the cylinder portion 1 and the transmission 3 is increased, and bending vibration is suppressed.

[0004]

By the way, a catalyst device C is often provided in the exhaust gas exhaust passage for purifying the combustion exhaust gas. However, when the engine is started, the temperature of the catalyst device C rises. Therefore, it is required that the recessed portion in front of the stiffener member 11 be selected as a space that is as close as possible to the exhaust port of the cylinder and that can accommodate the catalyst device C. Conceivable. Since this position is directly below the cylinder portion 1, the combustion exhaust gas reaches the catalyst device C while maintaining a high temperature, which is convenient because the combustion exhaust gas purification efficiency of the catalyst can be excellently maintained.

However, when the catalyst device C is arranged at the above-mentioned position, the catalyst device C receives high heat from the combustion exhaust gas, and the catalyst device C is heated to a considerably high temperature by its own exothermic reaction. The oil pan 10 located in the front is exposed to high temperature by receiving the heat radiation, and in particular, in the shallow pan portion 10a of the oil pan 10, the lubricating oil is heated until it is carbonized. In this case, not only the deterioration of the lubricating oil is promoted, but also the inconvenience of significantly shortening the life of various mechanical elements of the rotary system under severe lubricating conditions occurs.

Further, in order to prevent noise due to thin plate vibration of the oil pan, a specially processed damping steel plate has been used for the oil pan in recent years, but such damping steel plate is usually weak against heat, When exposed to high temperatures, there is also the disadvantage that the soundproofing effect decreases.

The present invention has been made in order to solve the above-mentioned problems, and is constructed so that the high heat of the catalyst device C is effectively blocked and the heat is not transmitted to the oil pan 10 and the like. It is intended to provide a cylinder block reinforcing structure.

[0008]

According to a first aspect of the present invention, there is provided a cylinder block reinforcing structure for an engine, wherein a reinforcing member connected to a cylinder block and a transmission is provided below a connecting portion between the cylinder block and the transmission. In the cylinder block reinforcing structure, the reinforcing member is arranged at a position below the coupling portion and below the oil pan, and a catalyst device for purifying combustion exhaust gas is arranged below the reinforcing member, and the reinforcing member is It is characterized in that it has a double structure having a cavity inside, and is provided with a vent hole for guiding traveling wind passing through the cavity to the periphery of the catalyst device.

The cylinder block reinforcing structure for an engine according to claim 2 of the present invention is the cylinder block reinforcing structure for an engine according to claim 1, wherein a heat insulating plate is further provided between the reinforcing member and the catalyst device. It is characterized by being present.

[0010]

According to the engine cylinder block reinforcing structure of the first aspect, the catalyst device for purifying the combustion exhaust gas is arranged below the oil pan at the connecting portion of the cylinder block and the transmission. Since the reinforcing member is arranged and has a double structure having a cavity inside, the radiant heat radiated from the catalyst device is effectively blocked by the reinforcing member having a double structure having a cavity inside. The lubricating oil in the oil pan located above it is not heated more than necessary, and the deterioration of the lubricating oil and the consequent shortening of the life of the movable part can be effectively prevented.

In addition, since the reinforcing member is provided with the vent hole through which the air for cooling the catalyst device flows, the cooling air is supplied to the catalyst device through the vent hole, and the excessive amount of the catalyst device is lost. The radiant heat can be reduced by suppressing heating.

According to the cylinder block reinforcing structure for an engine of the second aspect, since the heat insulating plate is further provided between the reinforcing member and the catalyst device, the radiant heat is also blocked by the heat insulating plate, and the oil Excessive heating of the lubricating oil in the pan is more effectively prevented.

[0013]

1 is a perspective view for explanation illustrating a cylinder block reinforcing structure according to the present invention in relation to a cylinder block and a transmission. As shown in this figure, the outer contour of an automobile engine E is a cylinder head 1a that holds various movable parts such as valves, cams, and gears, a cylinder block 1b in which a plurality of cylinders are arranged in parallel, and a cylinder block 1b below the cylinder block 1b. And a skirt portion 1c accommodating the crankshaft. The upper part of the cylinder head 1a is the head cover 1
Covered with a '. An oil pan 10 including a rear shallow plate portion 10a and a front deep plate portion 10b is provided below the skirt portion 1c. Lubricating oil is filled in the oil pan 10 and is circulated and supplied to various movable parts in the engine E.

The rear portion of the cylinder portion 1 is joined to approximately two-thirds of the upper portion of the transmission 3 in the vertical direction, and the remaining approximately one-third thereof is further than the shallow dish portion 10a of the oil pan 10. It is protruding downward.

Oil pan 1 of this transmission 3
The portion of the cylinder portion 1 that protrudes further downward than the shallow dish portion 10a of 0 and the lower portion of the cylinder portion 1 are bridged by the integrated stiffener 2 that is a reinforcing member.
And the transmission 3 are reinforced.

At the lower part of the integrated stiffener 2, a catalyst device C for purifying combustion exhaust gas is provided so as to extend in the engine width direction. Therefore,
The horizontal portion of the integrated stiffener 2 is interposed between the catalyst device C and the shallow pan portion 10a of the oil pan 10.

FIG. 2 is a plan view showing an example of a cylinder block reinforcing structure for an engine of the present invention, and FIG.
FIG. 4 is a sectional view taken along line A-A, and FIG. 4 is a sectional view taken along line BB in FIG. First, as shown in FIG. 2, the integrated stiffener 2 is provided below the shallow pan 10a of the oil pan 10 over the entire engine width direction. Further, a heat insulating plate 2a is provided in a lower portion thereof so as to project forward so as to cover the catalyst device C.

The integrated stiffener 2 has a horizontal portion 21 as shown in FIGS. 3 and 4.
And a vertical portion 22 and has an L-shape in a side view. The horizontal portion 21 of the integrated stiffener 2 has a double structure and includes an upper plate 21a and a lower plate 21b.
It consists of and. These upper plate 21a and lower plate 21b
Is supported by an intermediate support wall 21c extending in the engine width direction at an intermediate portion of the horizontal portion 21 and a tip support wall 21d extending in the engine width direction at a front tip portion of the horizontal portion 21, and the upper plate 21a. A cavity is formed between the lower plate 21b and the lower plate 21b.

A pair of connecting blades 23 are provided on both sides of the upper plate 21a in the engine width direction so as to project upward, and the connecting blades 23 and the skirt portion 1c of the cylinder portion 1 are connected to each other. The vertical portion 22 of the integrated stiffener 2 and the transmission 3
Are coupled to reinforce the joint between the cylinder portion 1 and the transmission 3.

A partition wall 21e is provided in the front-rear direction at an intermediate portion in the engine width direction between the upper plate 21a and the lower plate 21b of the integrated stiffener 2. Therefore, the cavity of the integrated stiffener 2 formed by the upper plate 21a and the lower plate 21b is in a state of being divided into two chambers in the engine width direction by the partition wall 21e. Both side portions of the cavity in the engine width direction (vehicle front-rear direction) are open to the outside. The lower plate 21b in front of the vehicle, which is divided by the partition wall 21e shown in FIG. 4, is provided with a vent hole 24 through which air for cooling the surface of the catalyst device C flows.

As shown in FIG. 3, the heat insulating plate 2a is provided so as to horizontally project from the upper front portion of the vertical portion 22 of the integrated stiffener 2, and the front end portion thereof descends to the right along the shape of the catalyst device C. It is curved like a bow. The heat insulating plate 2a also has ventilation holes 2a 'at positions corresponding to the ventilation holes 24 of the lower plate 21b of the integrated stiffener 2. Traveling air (cooling air) is supplied to the catalyst device C through these ventilation holes 24, 2a '. In addition, vent 2
In some cases, a'is not provided.

Since the engine cylinder block reinforcing structure of the present invention is constructed as described above, the catalyst device C is used.
Becomes hot and radiant heat of higher temperature is radiated,
The horizontal portion 21 of the integrated stiffener 2 located above it has a double structure consisting of an upper plate 21a and a lower plate 21b having a cavity inside, and a heat insulating plate 2a is provided below it. Therefore, the radiant heat is effectively blocked, and the radiant heat does not reach the shallow pan portion 10a of the oil pan 10 having a thin layer of lubricating oil, so that the lubricating oil in the oil pan 10 is heated until carbonized. There is no such thing.

The front end portion of the heat insulating plate 2a is curved downward along the catalyst device C so as to block the radiant heat from the catalyst device C to the basin portion 10b of the oil pan 10. Therefore, the lubricating oil can be effectively prevented from reaching a high temperature even in the deep pan 10b of the oil pan 10 in which the amount of lubricating oil is large and therefore it is not necessary to worry about carbonization of the lubricating oil too much. ..

Further, the lower plate 21b and the heat insulating plate 2a of the integrated stiffener 2 are provided with ventilation holes 24, 2a ', respectively, and the traveling wind passes through the ventilation holes 24, 2a' while traveling to allow the catalyst to travel. When the catalyst device C is supplied to the device C and the temperature of the catalyst device C tends to rise at high speed, the cooling effect of the traveling wind is enhanced, and the surface of the catalyst device C is
This is because the catalyst is cooled to the extent that the reactivity of the catalyst is not impaired and the amount of radiant heat generated is suppressed.
It effectively acts to prevent the temperature from rising.

If the traveling air supplied from the ventilation holes 2a 'of the heat insulating plate 2a to the catalyst device C lowers the temperature of the catalyst device C so that the reactivity of the catalyst deteriorates,
The ventilation hole 2a 'may be closed or may not be provided from the beginning. Then, the running wind will be the heat insulating plate 2.
Since only the upper surface of a is cooled and the catalyst device C is not affected, the oil pan 10 is not excessively heated while the catalyst retains the reactivity, which is convenient. Moreover, in this case, since the traveling wind passage formed between the heat insulating plate 2a and the lower plate 21b is narrower than the traveling wind passage formed between the upper plate 21a and the lower plate 21b, heat insulation is achieved. The wind speed on the plate 2a can be increased, and the effect of blocking radiant heat from the catalyst device C to the oil pan 10 is improved.

[0026]

As described above, according to the cylinder block reinforcing structure for an engine of the present invention, the front lower part of the transmission and the bottom part of the cylinder block are connected below the oil pan at the connecting part of the cylinder block and the transmission. Since a reinforcing member is provided and this reinforcing member has a double structure with a cavity inside, the radiant heat radiated from the catalyst device is effectively blocked by the double structure reinforcing member with a cavity inside. Therefore, the lubricating oil in the oil pan located above it is not heated more than necessary, and as a result, the deterioration of the lubricating oil and the consequent shortening of the life of the movable part can be effectively prevented.

Further, since the reinforcing member is provided with the vent hole through which the air for cooling the catalyst device flows, the cooling air is supplied to the catalyst device through the vent hole and the catalyst device is excessively heated. Since the radiant heat itself can be suppressed by suppressing the above, the excessive heating of the oil pan is also suppressed by this.

If a heat insulating plate is further provided between the reinforcing member and the catalyst device, the radiant heat is also blocked by this heat insulating plate, and it is possible to more effectively prevent unnecessary heating of the lubricating oil in the oil pan. You can

In addition, deterioration of the lubricating oil in the oil pan can be effectively prevented, and various devices and devices provided around the catalyst device that do not like the heat can be protected from heat, which is advantageous.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a cylinder block reinforcing structure for an engine of the present invention in relation to a cylinder block and a transmission.

FIG. 2 is a plan view showing an example of a cylinder block reinforcing structure for an engine of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a side view illustrating a conventional cylinder block reinforcing structure in relation to a cylinder block and a transmission.

[Explanation of symbols]

 1 Cylinder Block 1a Cylinder Head 1b Cylinder Block 1c Skirt Part 2 Integrated Stiffener 2a Insulation Plate 2a 'Ventilation Hole 21 Horizontal Part 21a Upper Plate 21b Lower Plate 21c Intermediate Support Wall 21d Tip Support Wall 21e Partition Wall 22 Vertical Part 23 Joining Wing 24 Vent 3 Transmission E Engine C Catalyst device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F02F 7/00 302 Z 7616-3G

Claims (2)

[Claims] 1. A cylinder block reinforcing structure for an engine, wherein a reinforcing member connected to a cylinder block and a transmission is provided below the connecting portion, the reinforcing member being below the connecting portion and oil. It is arranged at a position below the pan, a catalyst device for purifying combustion exhaust gas is arranged below the pan, and the reinforcing member has a double structure having a cavity inside, and the traveling wind passing through this cavity is described above. A cylinder block reinforcing structure for an engine, characterized in that ventilation holes are provided around the catalyst device. 2. The cylinder block reinforcing structure for an engine according to claim 1, further comprising a heat insulating plate provided between the reinforcing member and the catalyst device.