JPH09158743A - Heat insulating device of exhaust pipe fitting to turbocharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a heat insulating plate by fitting an exhaust manifold to an exhaust gas outlet of a turbine housing in a turbocharger in an approximately horizontal direction to prevent deformation or breakage of the heat insulating plate due to the heat and the vibration when the exhaust manifold and its vicinity are covered by the heat insulating plate. SOLUTION: An exhaust pipe 6 is provided long the longitudinal direction of an exhaust manifold 2, one end of the exhaust pipe 6 is fitted to an outlet 5 of a turbine housing 3, a supporting plate 7 is projected upward from a cylinder head 1 on the side on which the exhaust manifold 2 is projected, a base end part of the heat insulating plate 8 is fitted close to an upper end of the supporting plate 7, the other end side of the heat insulating plate 8 is covered to the outer side of the exhaust pipe 6 across an upper part of the exhaust pipe 6, and the other end side of the heat insulating plate 8 is fitted to the exhaust pipe 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield device for an exhaust pipe with a turbocharger.

[0002]

2. Description of the Related Art A turbocharger mounted between an exhaust manifold and a muffler is always exposed to high temperatures because it uses the energy of exhaust gas ejected to the atmosphere. And
Since a part of the exhaust path is used, if it is not installed near the engine, the piping will become long and internal resistance will increase, resulting in poor efficiency. Also, the power transmission belts, rubber pipes, seals, etc. made of rubber, etc., installed around the engine are inferior in heat resistance, so it is necessary to dispose them far from the vicinity of the exhaust gas passage or to provide a heat shield plate in the middle part. It was

High temperature parts such as the exhaust manifold and the exhaust pipe are
The amount of expansion and contraction is large due to the large difference in heat between when the engine is running and when it is not in use, and depending on how the heat shield is attached, the heat shield does not keep up with the amount of deformation and is immediately damaged, resulting in durability. Was inferior to One of the turbochargers without a heat shield plate is shown in Japanese Utility Model Laid-Open No. 63-60007. In this way, the exhaust manifold is projected upwards for a long time, and the turbocharger attached through the lower exhaust pipe is attached to the upper exhaust pipe. In the case of connecting to the muffler via the heat shield plate, if the heat shield plate is attached because the high temperature part becomes too large, the heat shield plate becomes very large, and if there are few mounting parts, the shape of the heat shield plate becomes complicated. Conceivable.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a heat shield plate is attached with good durability while having a small shape.
It was intended to also serve as a reinforcement after the installation of a long exhaust pipe, and the following technical measures were taken. That is, the exhaust manifold 2 is projected from the cylinder head 1 to the side,
A lower flange 4 of a turbine housing 3 is mounted on the exhaust manifold 2 to discharge exhaust gas from an outlet 5 provided on one side of the turbine housing 3 in a direction along the longitudinal direction of the exhaust manifold 2. An exhaust pipe 6 is provided along with one end of the exhaust pipe 6 is attached to the outlet 5 of the turbine housing 3, and a support plate 7 is projected upward from the cylinder head 1 on the side where the exhaust manifold 2 is projected. The base end portion of the heat shield plate 8 is attached near the upper end of the support plate 7, and the other end side of the heat shield plate 8 is detoured above the exhaust pipe 6 to cover the outside of the exhaust pipe 6, The other end side of the exhaust pipe is attached to the exhaust pipe 6, and the heat shield device for the exhaust pipe with a turbocharger is configured.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated example, the present invention is folded into an engine 10 portion of a mobile agricultural machine such as an agricultural tractor or a combine. The engine 10 is a diesel engine, and has a cylinder body 11 having a crankshaft, a connecting rod, and a piston installed therein, an oil pan 12 that covers the lower portion of the cylinder and stores lubricating oil therein, and is attached to the upper portion of the cylinder body 11. Cylinder head 1 with built-in intake and exhaust valves
, A head cover 13, a gear case 14 in which gears for transmitting the rotation of the crank shaft to the oil pump, the cam shaft, the injection pump shaft, and the like through each gear, and the cooling fan 15 are attached to the outer end of the shaft. In addition, it is composed of a fan shaft 16 having a water pump installed therein, and other accessories such as a generator 17 and a starter motor 18 are attached.

Exhaust gas (G) that has exploded and burned in a combustion chamber (not shown) between the cylinder body 11 and the cylinder head 1 of the engine 10 flows to the turbine housing 3 through the exhaust manifold 2, and the exhaust pipe 6 and the muffler (not shown). It is released to the atmosphere via The example engine 10
Is a four-cylinder cylinder engine, and the exhaust manifold 2 has four exhaust passages combined into one, so that the exhaust manifold 2 projects to one side of the cylinder head 1 and an exhaust outlet is provided in the upper center of the front-rear direction. The lower flange 4 is attached with tightening tools such as bolts and nuts. An exhaust turbine (not shown) that is rotated by the flow energy of the exhaust gas is installed in the turbine housing 3, and a turbocharger is constituted by both of the intake housing 19 that houses the intake turbines arranged next to each other. There is. The intake housing 19 is provided with an intake port 20 and a discharge port 21, and the outside air (H) sucked from the intake port 20.
Is pressurized by the intake turbine and is supplied to the combustion chamber of the engine 10 from the discharge port. The turbine housing 3 and the intake housing 19 are sealed from each other, and the shaft portion is lubricated and supported by the pressure oil pipe 22 and the exhaust oil pipe 23 for the turbine of high temperature and high rotation.

Referring to FIG. 2, the area around the turbocharger will be described. The stud bolts 24, 24. . Of the stud bolts 24, 24. . 3 is inserted into the boss 25 at the base end of the exhaust pipe 6 shown in FIG. As shown in FIG. 3, the exhaust pipe 6 extends toward the other end side with a slight downward inclination, and is provided with a mounting flange 27 at the other end. Although not shown, a silencer is attached to the mounting flange 27, and the silencer is the engine 1
0 is exhausted outside the cover that covers 0. 28 is a mounting tap hole provided on the outer side of the exhaust pipe 6,
Reference numeral 9 is a mounting hole, which is a mounting stay 3 protruding from the lower portion of the exhaust pipe 6.
It is open at 0 and 30.

As shown in FIG. 7, an exhaust manifold 2 projects outward from a cylinder head 1 of an engine 10, and a lower flange 4 of a turbine housing 3 of a turbocharger is attached to the projected exhaust manifold 2 at the center in the front-rear direction. On the cylinder head 1 side on the exhaust rear side of the exhaust manifold 2, front and rear lower end mounting portions 36, 37 of the support plate 7 are attached. The front lower end mounting portion 36 is directly mounted on the cylinder head 1 with a bolt 38, and the rear lower end mounting portion 37 is mounted outside the mounting seat of the exhaust manifold 2 together with a tightening bolt 39. As described above, the support plate 7 is an inner wall plate that is low in height and substantially upright inside the exhaust manifold 2, and has the mounting surface 31 with the upper end bent, so that the support plate 7 is a small member for the cylinder. It can be easily attached around the head 1.
Base mounting holes 32, 32 opened at the base end of the heat shield plate 8 shown in FIGS. 4, 5 and 6 are attached to the mounting surface 31, and nuts are welded for mounting the base mounting taps 33, 33. I am trying.

The stud bolts 24, 24. . The mounting hole 26 of the boss 25 of the exhaust pipe 6 is inserted into the portion and mounted with a nut, and the base end mounting holes 32 and 32 of the heat shield plate 8 are provided so as to cover the upper side of the exhaust pipe 6.
It is attached to the base end mounting taps 33, 33 of the above through bolts. The heat shield plate 8 has a base end portion attached to a mounting surface 31 near the upper end of the support plate 7, covers the other end side of the heat shield plate 8 above the exhaust pipe 6 and covers the outside of the exhaust pipe 6. Since the other end side of the heat shield plate 8 is attached to the mounting tap holes 28, 28 of the exhaust pipe 6, the heat shield plate 8 extending in a substantially horizontal direction is attached to the exhaust pipe 6 in the longitudinal direction to serve as a strength member. Even if each member is strongly assembled and the exhaust pipe 6 is deformed by repeating thermal expansion and contraction during cold and pushes and pulls the heat shield plate 8, this load is deflected by the deflection of the upper edge of the support plate 7. Since it escapes, cracks of the heat shield plate 8 are unlikely to occur and the heat shield plate 8 has durability.

In the illustrated example, further, substantially L-shaped reinforcing plates 34, 34 are integrally attached to the front and rear portions of the inner surface of the heat shield plate 8, and the tip end mounting hole 35 of the reinforcing plate 34 is provided in the exhaust pipe 6. Attached to the mounting tap holes 28, 28 provided on the outer side of
The base end attachment hole 44 of the reinforcing plate 34 is attached to the tap 33 portion of the attachment surface 31 of the support plate 7 described above. The rear surface of the heat shield plate 8 has a U-shape that is open at the bottom, and the base end side mounting holes 32 and 32 are provided at the upper end of the support plate 7 with an inclined mounting surface 31.
7, the upper part of the turbine housing 3 and the upper part of the rear part of the exhaust pipe 6 are strongly covered as shown in FIG. 7, and the front cooling fan 15 is rotated as a heat shield cover. When the mobile agricultural machine runs, cooling air flows inside the lower part of the heat shield plate 8 to enhance the heat shield effect.

FIG. 10 shows another embodiment of the main part of the engine 10 and relates to a cooling water passage. Engine 1
On the side wall 40 of the cylinder body 11 of 0, the sealing cup 4 which is a lid body for taking out the core generated in the manufacturing process of the water housing 41 and closing the internal processing part
2 is attached, and a rotary blade 43 is provided inside the sealing cup 42. By the rotary blades 43, the rotary blades 43 are rotated by the flow of the cooling water flowing toward the cylinder head 1 side and the respective cylinder directions, and the flow is generated in every corner of the water housing 41.
Even in a complicated cooling water passage, heat spots were less likely to occur. Further, since many sealing cups 42 are attached around the side wall 40, it is possible to improve the effect with a small number such as folding this structure only at the end of the water channel where a thermal problem occurs.

[0012]

As described above, according to the present invention, the exhaust manifold 2 is provided so as to project laterally from the cylinder head 1 and the lower flange 4 of the turbine housing 3 is mounted on the exhaust manifold 2 so that the exhaust gas is supplied to the turbine housing 3.
When the exhaust gas is discharged from the outlet 5 provided on one side in the direction along the longitudinal direction of the exhaust manifold 2, an exhaust pipe 6 is provided along this discharge direction, and one end of the exhaust pipe 6 is connected to the outlet 5 of the turbine housing 3. Since the exhaust pipe 6 protrudes in substantially the same direction as the exhaust manifold 2 and the cylinder head 1, the support plate 7 is made smaller toward the upper side from the cylinder head 1 on the side where the exhaust manifold 2 is projected. It becomes possible to easily attach the member around the cylinder head 1. Further, a base end portion of the heat shield plate 8 is attached near the upper end of the support plate 7, and the other end side of the heat shield plate 8 is detoured above the exhaust pipe 6 to cover the outside of the exhaust pipe 6, Since the other end of the heat plate 8 is attached to the exhaust pipe 6, this heat shield plate 8 extending in a substantially horizontal direction is attached to the exhaust pipe 6 in the longitudinal direction, and each member is strongly assembled as a strength member. Even if the exhaust pipe 6 is deformed by repeating thermal expansion and shrinkage during cold and pushes and pulls the heat shield plate 8, this load is released at the upper edge of the support plate 7, so that the heat shield plate 8 is cracked. It becomes a heat shield that is difficult and durable.

[Brief description of the drawings]

FIG. 1 is a side view of a main part.

FIG. 2 is a side view of an essential part with main parts removed from FIG.

FIG. 3 is a side view of a main part and an exhaust pipe removed from FIG.

FIG. 4 is a side view of a main part and a heat shield plate removed from FIG.

FIG. 5 is a rear view of FIG.

FIG. 6 is a plan view of FIG. 4;

FIG. 7 is a partial cross-sectional rear view of FIG.

FIG. 8 is a side view of the entire engine.

FIG. 9 is a rear view of FIG.

FIG. 10 is a front cross-sectional view of another main part.

[Explanation of symbols]

 1 Cylinder Head 2 Exhaust Manifold 3 Turbine Housing 4 Lower Flange 5 Outlet 6 Exhaust Pipe 7 Support Plate 8 Heat Insulation Plate

Claims (1)

[Claims] 1. An exhaust manifold 2 is provided so as to project laterally from a cylinder head 1, a lower flange 4 of a turbine housing 3 is mounted on the exhaust manifold 2, and exhaust gas is discharged from an outlet 5 provided on one side of the turbine housing 3. In the case of discharging in the direction along the longitudinal direction of the exhaust manifold 2, an exhaust pipe 6 is provided along this discharging direction, and one end of the exhaust pipe 6 is provided with an outlet 5 of the turbine housing 3.
And a support plate 7 is projected upward from the cylinder head 1 on the side where the exhaust manifold 2 is projected, and a base end portion of a heat shield plate 8 is mounted near an upper end of the support plate 7.
The other end of the heat shield plate 8 is bypassed above the exhaust pipe 6
A heat shield device for an exhaust pipe with a turbocharger, characterized in that the other end side of the heat shield plate 8 is attached to the exhaust pipe 6 so as to cover the outside thereof.