JP2601773Y2 - Heat shield cover mounting structure for turbocharged engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a heat shield cover to be mounted on an exhaust manifold in a supercharged engine of a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, as an engine with a supercharger of a horizontally opposed type, an engine shown in FIG. 3 has been proposed by the present applicant. That is, since the engine main body 11 is formed thin and in a shortened shape, the exhaust manifold 13 is taken out below the left and right banks of the engine main body 11, and the turbocharger is placed at a high place just behind the left and right banks of the engine main body 11. 14 are provided. Then, in order to connect the exhaust manifold 13 below the engine body 11 to the turbocharger 14 at the rear high place, the exhaust manifold 13 is formed to be bent, and the exhaust manifold 13 is formed in an exhaust pipe 1 which is piped obliquely upward and rearward.
9 through the turbine housing 14 of the turbocharger 14
a.

In order to block the heat of the exhaust manifold 13 below the engine body 11 from reaching the road surface, a heat shield cover 50 is attached to the lower part of the left and right banks of the engine body 11. The heat shield cover 50 is formed so as to cover the entire area along the shape of the exhaust manifold 13 by curving the lower surface 50 a and is effectively shielded by the heat shield cover 50.

As shown in the figure, when a power unit 30 having a clutch, a transmission, and a front differential device 32 is coupled to a supercharged engine 10 in a vertically arranged arrangement and mounted on a vehicle, the front of the engine 10 immediately after the engine main body 11 is mounted. The transmission is transmitted from the differential device 32 to the front wheels 33 via the axle device 40 in the left-right direction of the vehicle body. And immediately after the middle of the exhaust pipe 19 which is arranged to be tilted backward,
As a constant velocity joint of the axle device 40, for example, a boot 45 of a double offset joint (DOJ) 42 is arranged orthogonally.

Since the lower surface 50a of the heat shield cover 50 of the exhaust manifold 13 is curved as described above,
Hot air A flowing along this lower surface is directed upward and backward,
This hot air A is a double offset joint (DOJ)
It comes into direct contact with the boots 45 of 42. Therefore, the boot 45 is made of rubber, and may be damaged due to an increase in the temperature beyond an allowable range, and the function of the double offset joint (DOJ) 42 may be reduced.

[0006] Conventionally, a structure for mounting a heat shield cover of the above-described engine with a supercharger is disclosed in, for example, Japanese Utility Model Laid-Open Publication No.
There is a prior example in Japanese Patent Application Laid-Open Publication No. H11-207, in which an intake manifold and an exhaust manifold are arranged on the upper part on one side of a vertical engine main body. Therefore, a turbocharger is arranged near these manifolds. It is disclosed that a heat shield cover is provided on an exhaust pipe from a turbocharger at a high place to prevent heat damage.

[0007]

In the above-mentioned prior art, since the exhaust manifold is taken out from the upper part of the vertical engine body, there is no influence on the axle at a low position. In addition, since the exhaust pipe output from the turbocharger is provided with a heat shield cover, it cannot be applied to the present invention.

In view of the above circumstances, the present invention prevents heat damage to the joint boots of the axle device due to the heat shield cover in the exhaust system that is routed from below the engine body to the turbocharger located at a high position in the rear. An object of the present invention is to provide a heat shield cover mounting structure for a supercharged engine.

[0009]

According to the present invention, a turbocharger is provided at a high place immediately after an engine body, and an exhaust manifold having a heat shield cover is provided below the engine body. The exhaust manifold is bent and taken out.This exhaust manifold is connected to a turbocharger via an exhaust pipe inclined upward and backward, and a constant speed joint boot of an axle device is mounted orthogonally on the vehicle immediately in the middle of the exhaust pipe. In a turbocharged engine, a heat shield cover to be mounted on an exhaust manifold is installed so as to direct hot air flowing along the exhaust manifold from a boot of a constant velocity joint.

[0010]

According to the present invention having the above structure, the heat of the exhaust manifold taken out below the engine body of the supercharged engine is reliably blocked by the heat shield cover. Also, when a constant velocity joint boot is placed immediately after the exhaust pipe in the on-board state of the turbocharged engine, the hot air flowing along the heat shield cover is directed so as to come off from the boot, so that the hot air is You will not hit the boots directly. Therefore, damage to the boots of the constant velocity joint due to the hot air from the heat shield cover can be reliably prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the structure of the horizontally opposed engine with a supercharger and the on-vehicle state will be described. First, a supercharged engine 10 and a drive system power unit 30 are mounted in a vertically arranged arrangement inside an engine room 3 partitioned by a toe board 2 in a vehicle body 1. In the turbocharged engine 10, since the engine body 11 is formed thin and in a shortened shape, the intake manifold 12 is provided at the upper part of the left and right banks of the engine body 11, and the exhaust manifold 1 is provided at the lower part.
3 are connected in series. Further, a turbocharger 14 is disposed at a high place immediately after the left and right banks of the engine main body 11, and an intercooler 15 is disposed by utilizing a space above the engine main body 11 and the power unit 30. The blower housing 14b of the turbocharger 14 is connected to the rear of the intercooler 15 via the intake pipe 16, and the front of the intercooler 15 is connected to the intake manifold 12 via the throttle body 17 and the chamber 18. It is routed.

The exhaust manifold 13 taken out below the engine body 11 is connected to a turbocharger 14
The exhaust manifold 13 is bent and formed in a side view, and the exhaust manifold 13 is connected to a turbine housing 14a of the turbocharger 14 via an exhaust pipe 19 which is arranged obliquely rearward and upward. On the other hand, in order to block the heat of the exhaust manifold 13 below the engine body 11 from reaching the road surface, a heat shield cover 20 is attached so as to cover the entire area of the exhaust manifold 13.

The power unit 30 connected to the rear of the engine body 11 has an integral structure in which a clutch, a transmission, and a front differential device 32 are arranged below the main case 31 between the two. The front differential device 32 is connected to the front wheels 33 by the left and right axle devices 40 so as to transmit power.

As shown in FIG. 2, the axle device 40 has a double offset joint (DO) in which a side gear shaft 41 that outputs to the left and right of a front differential device 32 is a constant velocity joint that can be bent and slid in the axial direction.
J) 42 to the axle 43. Axle 43
Is a front wheel 3 through an undercut free joint (UFJ) 44 as a constant velocity joint capable of bending at a wide angle.
3 and is configured to be able to transmit power at a constant speed in a state where it is appropriately bent up and down and back and forth as a whole. The double offset joint (DOJ) 42 is covered with a rubber boot 45 between the outer race 42a and the mounting portion 43a on the axle side in order to prevent intrusion of debris, water and the like.

When the supercharged engine 10 and the power unit 30 are mounted on the vehicle, the boot 45 of the double offset joint (DOJ) 42 of the axle device 40 is provided immediately after the exhaust pipe 19 which is disposed inclining rearward. Are arranged orthogonally. Further, in the lower space between the engine body 11 and the power unit 30, a steering gear box 2 is provided.
8 are provided, and the cross members 25 of the vehicle body structural members are arranged orthogonally. In FIG. 1, reference numeral 26 denotes a belt cover of a valve train, and 27 denotes a radiator.

The heat shield cover 20 will be described in more detail. The heat shield cover 20 is formed in a straight box shape with the lower surface 20a being different from the shape of the exhaust manifold 13 which is bent in a letter shape. The heat shield cover 20 is mounted on the lower portion of the engine body 11 so as to cover the exhaust manifold 13, and the hot air flowing along the lower surface 20 a is directed so as to come off below the joint boot 45.

Next, the operation of this embodiment will be described. First, exhaust gas discharged below the engine body 11 during operation of the engine is guided to and operated by a turbocharger 14 at a rear high place by an exhaust manifold 13 and an exhaust pipe 19, and is suction-compressed by the turbocharger 14. The cooling air is cooled by the intercooler 15, and the throttle body 17, the chamber 18, and the intake manifold 12 are used to cool the engine body 1.
1 and supercharged to obtain high engine output characteristics.
Further, the engine power is input to the power unit 30, and the shifting power is transmitted from the front differential device 32 to the side gear shaft 41 of the axle device 40 and the two constant velocity joints 4.
The vehicle travels by constantly transmitting at a constant speed to the front wheels 33 via the axles 43 and 44 for driving.

At this time, the exhaust manifold 13 projecting below the engine body 11 is covered with the heat shield cover 20, so that the high heat of the exhaust manifold 13 is surely shut off by the heat shield cover 20, so that heat damage to the road surface side is prevented. Is prevented. Further, the hot air A heated along the lower surface 20a of the heat shield cover 20 flows straight backward due to the straight shape and flows through the double offset joint (DO) of the axle device 40.
J) It does not hit the boots 45 of 42. For this reason, the boot 45 is prevented from being damaged due to a rise in temperature due to hot air, and a double offset joint (DOJ)
42 itself is always in good working condition.

Although the embodiment of the present invention has been described above, the present invention can be applied to a similar engine with a supercharger other than the horizontally opposed type.

[0020]

[Effect of the invention] As described above, according to the invention,
In a turbocharged engine, the heat shield cover to be installed on the exhaust manifold below the engine body is installed so as to direct the hot air flowing along it away from the constant velocity joint boots. The heat damage of the boot of the constant velocity joint can be reliably prevented in the on-board state of the engine with the feeder. For this reason, the constant velocity joint can always be maintained in a favorable operation state. The structure of the heat shield cover is simple because it only changes the shape.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a heat shield cover mounting structure of a supercharged engine according to the present invention.

FIG. 2 is a side view showing the axle device in a partially sectional view.

FIG. 3 is a side view showing a conventional heat shield cover mounting structure.

[Explanation of symbols]

 Reference Signs List 10 Engine with supercharger 11 Engine body 13 Exhaust manifold 14 Turbocharger 19 Exhaust pipe 20 Heat shield cover 40 Axle device 42 Double offset joint (DOJ) 45 Boots

Claims (2)

(57) [Scope of request for utility model registration] 1. A turbocharger is disposed at a high place immediately after an engine body, and an exhaust manifold provided with a heat shield cover below the engine body is bent and taken out, and the exhaust manifold is inclined backward and upward. The turbocharger is connected to the turbocharger through the exhaust pipe, and the boot of the constant velocity joint of the axle device is arranged orthogonally right after the exhaust pipe. A heat shield cover mounting structure for an engine with a supercharger, wherein the heat shield cover is installed so as to direct hot air flowing along the cover away from boots of a constant velocity joint. 2. The heat shield cover has a lower surface 20a.
The heat shield cover mounting structure for a supercharged engine according to claim 1, wherein the heat shield cover mounting structure is formed so as to cover a bent exhaust manifold formed in a trate box shape .