JPH11236854A - Structure of stiffener in transverse type internal combustion engine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a catalyst case from a heat harm surely by a few number of parts by providing a heat insulator integrally on a stiffener, in a device with the space between the lower surface of a cylinder block and the part of a transmission case in response thereto connected by the stiffener mutually. SOLUTION: A stiffener 13 made of a light alloy of aluminum alloy is arranged between the lower surface 2a of a cylinder block 2 and the part projected downward from the lower surface 2a of the cylinder block out of a transmission case 8 and this stiffener 13 is tightened attachably/detachably by a plurality of bolts 14 for both the cylinder block 2 and the transmission case 8. A heat insulator 15 for a catalyst case 12 is provided integrally so as to cover while keeping the clearance 16 between an oilpan 4 and it on such stiffener 13. A cover plate 17 for covering the part projected from the lower surface 2a of the cylinder block 2 out of the joined surface of the cylinder block 2 of the transmission case 8 is provided integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stiffener structure for improving the rigidity of a connection portion of an internal combustion engine mounted on a vehicle when a transmission case is connected to one end face of the output side. .

[0002]

2. Description of the Related Art In general,
When the internal combustion engine is mounted in the engine room of the vehicle in a horizontal position with its crankshaft perpendicular to the traveling direction, the longitudinal side surface on the exhaust side of the internal combustion engine is moved forward with respect to the traveling direction to intake air. The exhaust pipe from the exhaust manifold attached to the exhaust-side longitudinal side is extended rearward through the lower part of the internal combustion engine by mounting the longitudinal side of the side toward the rear with respect to the traveling direction. The exhaust pipe, or a catalyst case provided in the middle of the exhaust pipe, is provided on an oil pan portion attached to a lower portion of the internal combustion engine, and on one end surface on the output side of the internal combustion engine. The heat damage to the connected mission case increases.

On the other hand, the transmission case is connected to one end face of the output side of the internal combustion engine such that the lower portion of the transmission case projects downward from the lower surface of the cylinder block. In order to improve the rigidity of the part, the lower surface of the cylinder block and the lower part of the transmission case are connected by a stiffener (for example, Japanese Utility Model Application Laid-Open No. 58-129040).
And Japanese Utility Model Application Laid-Open No. 63-28728).

However, the conventional stiffener is only for improving the rigidity of the connecting portion, and therefore, the exhaust pipe disposed below the internal combustion engine or the exhaust pipe of the exhaust pipe is not provided. In order to prevent heat damage to the oil pan and the transmission case from the catalyst case provided on the way, the exhaust pipe or a heat insulator covering the catalyst case on the way must be provided separately from the stiffener. In addition, a cover plate that covers a portion of the transmission case that is connected to the cylinder block and that protrudes from the lower surface of the cylinder block must also be provided separately from the stiffener, so that the number of parts increases and the weight increases. ,as well as,
There is a problem that the number of assembling steps is increased.

An object of the present invention is to solve these problems.

[0006]

SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides a vehicle mounted on a vehicle with a crank axis extending sideways and an exhaust-side longitudinal side facing forward. In a horizontal internal combustion engine for a vehicle, a stiffener for connecting the transmission case to a portion protruding from the lower surface of the cylinder block is provided between a transmission case and a portion protruding from a lower surface of the cylinder block. An exhaust pipe provided below the engine or a heat insulator for a catalyst case in the middle of the exhaust pipe is integrally provided so as to cover an oil pan on the lower surface of the cylinder block with a gap therebetween, and the transmission case is provided with a heat insulator. Block the part of the joint surface to the cylinder block that protrudes from the lower surface of the cylinder block The plate was constructed to say that integrally provided. ".

[0007]

Operation and effect of the present invention
A heat insulator that covers the oil pan on the lower surface of the cylinder block with a gap between the oil pan and the transmission case from the exhaust pipe or the catalyst case to the oil pan and the transmission case, and the cylinder in the joint surface of the transmission case and the cylinder block. A cover plate that covers a portion protruding from the lower surface of the block can be reliably reduced by the cover plate, and a portion of the joint surface of the transmission case to the cylinder block that protrudes from the lower surface of the cylinder block can be closed by the cover plate. Nevertheless, the heat insulator and the lid plate can be made into one part integrated with a stiffener for reinforcing the joint of the transmission case to the cylinder block.

Therefore, according to the present invention,
Since the number of parts can be reduced, there is an effect that the weight can be reduced and the number of assembling steps can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 denotes an internal combustion engine comprising a cylinder block 2, a cylinder head 3 fastened to the upper surface thereof, and an oil pan 4 attached to a lower surface 2a of the cylinder block 2.
An intake manifold 5 with an air cleaner 6 is mounted on one longitudinal side surface 3a of the cylinder head 3, and an exhaust manifold 7 is mounted on the other longitudinal side surface 3b of the cylinder head 3, respectively. The transmission case 8 is coupled to the end surface 2b such that the lower portion of the transmission case 8 projects downward from the lower surface 2a of the cylinder block 2.

The internal combustion engine 1 has a vehicle body frame 9.
In the front engine room 10, the crankshaft 1a is mounted so that the crank axis 1a is lateral to the traveling direction in a plan view, and the exhaust-side longitudinal side surface 3b of the cylinder head 3 faces forward. A catalyst case 12 provided in the middle of an exhaust pipe 11 extending rearward from the exhaust manifold 7 below the internal combustion engine 1 is provided in a portion below the oil pan 4 and adjacent to the transmission case 8. Have been.

The lower surface 2a of the cylinder block 2
A stiffener 13 made of a light alloy such as an aluminum alloy is disposed between the transmission case 8 and a portion of the transmission case 8 projecting downward from the lower surface 2a of the cylinder block 2.
3 is detachably fastened to both the cylinder block 2 and the transmission case 8 with a plurality of bolts 14.

A heat insulator 15 for the catalyst case 12 is integrally provided on the stiffener 13 so as to cover the oil pan 4 on the lower surface of the cylinder block 2 with a gap 16 therebetween.
A cover plate 17 that integrally covers a portion of the joint surface of the transmission case 8 with the cylinder block 2 that protrudes from the lower surface 2a of the cylinder block 2 is provided integrally.

With this configuration, the heat damage from the catalyst case 12 to the oil pan 4 and the transmission case 8 is covered with the oil pan 4 on the lower surface 2a of the cylinder block 2 with a gap 16 therebetween. The heat insulator 15 and the cover plate 17 that covers a portion of the joint surface of the transmission case 8 with the cylinder block 2 that protrudes from the lower surface 2a of the cylinder block 2 can be reliably reduced. The heat insulator 15 and the cover plate 17 are connected to the transmission case 8 to the cylinder block 2 while the portion protruding from the lower surface 2a of the cylinder block 2 can be closed. Integrated with the stiffener 13 to reinforce the part It is possible to single component.

A slit 18 having an appropriate size S is formed between the left and right ends of the heat insulator 15 and the lower surface 2a of the cylinder block 2, so that the traveling wind generated when the vehicle travels is supplied to the slit 18. It is configured to improve the cooling performance of the heat insulator 15 by blowing through the gap 16 from above. Further, the heat insulator 15 extends to a position substantially below the oil filter 19 attached to the side surface of the cylinder block 2, and the lubricating oil that falls when the oil filter 19 is removed is applied to the catalyst case 12. It is configured to say prevent.

[Brief description of the drawings]

FIG. 1 is a plan view when an internal combustion engine is mounted on a vehicle.

FIG. 2 is an enlarged side view taken along the line II-II of FIG.

FIG. 3 is a partially cutaway side view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

[Explanation of symbols]

Reference Signs List 1 internal combustion engine 1a crank axis 2 cylinder block 2a lower surface of cylinder block 2b output end surface of cylinder block 3 cylinder head 3b exhaust side longitudinal side surface of cylinder head 4 oil pan 7 exhaust manifold 11 exhaust pipe 12 catalyst case 13 stiffener 14 bolt 15 heat Insulator 16 Clearance 17 Cover plate

Claims (1)

[Claims] 1. A transmission case which is mounted on a vehicle with a crank axis transverse and a longitudinal side on an exhaust side facing forward, and a lower surface of a cylinder block and a transmission case connected to one end surface on an output side of the cylinder block. In a horizontal internal combustion engine for a vehicle, comprising a stiffener for connecting the stiffener to a protruding portion, an exhaust pipe disposed below the internal combustion engine in the stiffener, or a catalyst case in the middle of the exhaust pipe. Is provided integrally so as to cover the oil pan on the lower surface of the cylinder block with a gap therebetween, and closes a portion of the joining surface of the transmission case with the cylinder block that protrudes from the lower surface of the cylinder block. A horizontal internal combustion engine for a vehicle, wherein a cover plate is integrally provided. Stiffener structure in Seki.