JPH116440A - Exhaust turbine cover for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount an exhaust turbine in an enclosing condition by connecting an installing plate to one side of a cover body for covering the exhaust turbine, and fastening the installing plate by a connecting bolt for connecting an exhaust pipe togather to a casing of the exhaust turbine. SOLUTION: A part having a possibility of touching by human hands on an outer surface of an exhaust turbine 13, is covered with a cover 14 substantially. Work is safely carried out without touching on the exhaust turbine 13. The cover 14 consists of a cover main body 15 and an installing plate 16. In order to fix the cover 14 to a prescribed position, a bolt 19 used for connecting an exhaust pipe 18 to the exhaust turbine 13 is also used as a fixing tool of the cover 14 without using a specified fixing tool and the like. It is thus possible to remarkably reduce the number of parts of the cover 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an exhaust turbine cover for covering a casing of an exhaust turbine of an engine installed in a construction machine or the like so as to protect the exhaust turbine cover from being touched by an operator's hand or the like. Things.

[0002]

2. Description of the Related Art As a construction machine, for example, a hydraulic excavator, as is well known, has a crawler-type lower traveling body in which an upper revolving body provided with an operator's cab and a front working mechanism is rotatably mounted. The front working mechanism includes a front attachment including a boom, an arm, a bucket, and the like. Traveling by the lower traveling structure and turning of the upper revolving structure are performed by a hydraulic motor,
The boom, arm, bucket, and the like that constitute the front working mechanism are driven by hydraulic cylinders. Hydraulic actuators composed of these hydraulic motors and hydraulic cylinders are driven by pressure oil supplied from a hydraulic pump,
An engine is provided to drive the hydraulic pump.

[0003] A supercharger is provided to improve the intake efficiency of the engine. This supercharger is equipped with a compressor that compresses the air when it takes in outside air and supplies air for combustion to the engine.The compressor is driven by the shaft output of the engine and exhaust gas from the engine is used. There is a method of driving a compressor by utilizing this. In the system in which the supercharger is driven by the exhaust gas, an exhaust turbine is provided in an exhaust path of the exhaust gas from the engine. Since the high temperature exhaust gas immediately after being discharged from the engine is guided to the exhaust turbine, the casing of the exhaust turbine is heated to an extremely high temperature during operation of the engine.

[0004] The engine is provided together with a hydraulic pump and other equipment in an engine room covered with a cover forming a machine room of the upper-part turning body, and the engine room is substantially closed. In a normal state, there is no possibility that the hand or the like touches the casing of the exhaust turbine. However, if any trouble occurs in the engine or other equipment during the operation with the hydraulic excavator, the operator or the like opens the cover of the engine room and performs an inspection. At this time, there is a risk that the exhaust turbine may be touched by a hand or the like. . If a long time has elapsed since the engine was stopped, the temperature of the casing of the exhaust turbine also decreases.However, during work, for example, immediately after the engine is stopped or while the engine is running, the exhaust turbine Since the exhaust turbine is also in a high temperature state, a configuration in which an exhaust turbine is covered with a cover so that a hand or the like does not directly touch the exhaust turbine is conventionally known.

[0005] Therefore, the configuration of a conventional exhaust turbine cover is shown in FIGS. 4 and 5. In these figures, reference numeral 1 denotes a supercharger provided on an upper portion of an engine 2, and an intake pipe 3 is connected to the supercharger 1, and air taken in from the intake pipe 3 is compressed, The power is supplied to the engine 2. An exhaust manifold (both not shown) is connected to a cylinder block of the engine 2, an exhaust turbine 5 is connected to a pipe 4 from the exhaust manifold, and an exhaust pipe 6 is connected to the exhaust turbine 5. It is connected to the. Therefore, by passing the exhaust gas from the engine 2 to the exhaust turbine 5, the compressor incorporated in the supercharger 1 is driven at the flow velocity, and the air taken into the supercharger 1 is compressed. .

Reference numeral 7 denotes a cover for covering the casing of the exhaust turbine 5. This cover 7 is formed by bending a metal plate so that an operator or the like faces the periphery of the exhaust turbine 5, particularly to the outside. To cover areas that may be touched. In order to fix the cover 7, the wall surface of the supercharger 1 and the wall surface of the exhaust pipe 6 are used.
At both ends of the cover 7, mounting plates 7a and 7b are connected to each other, and the mounting plates 7a and 7b are respectively connected to the upper surface of the turbocharger 1 and the exhaust pipe 6 using bolts 8.
It is provided fixedly to the side surface on the side.

[0007]

By the way, when the mounting structure of the supercharger 1 is as shown in FIGS. 4 and 5, a screw seat for mounting the bolt 8 to the supercharger 1, the exhaust pipe 6, or the like is provided. Must be provided. Therefore, there are problems that this mounting structure is complicated and the number of parts is increased. Further, there is another problem that the cover cannot be simply added to an exhaust turbine having no cover because of the provision of a screw seat or the like in the turbocharger 1 or the exhaust pipe 6.

The present invention has been made in view of the above points, and an object of the present invention is to provide an exhaust turbine cover for an engine which has a simple structure and can be easily mounted on an exhaust turbine. Is to do.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an exhaust pipe which is disposed in an exhaust gas discharge path for supercharging combustion air supplied to an engine. A cover for covering an exhaust turbine to be connected, the cover having a cover body for covering the exhaust turbine, and a mounting plate connected to one side of the cover body. In order to connect the pipes, together with the flange portion provided on the exhaust pipe, the mounting plate is jointly fastened to the side surface of the exhaust turbine with connection bolts.

Here, if the cover main body is provided with a plurality of bent portions in a direction away from the connecting portion to the mounting plate, even if the cover main body is made thinner, the strength and the vibration resistance can be improved. improves. In addition, if an arc portion of approximately 180 ° is formed on the mounting plate so as to bypass the exhaust pipe, and it is configured to be tightened at three places with connection bolts, the exhaust pipe may be in the way when attaching and detaching the cover. And its attachment and detachment becomes easy. In addition, if the mounting plate is provided with an opening for ventilation, it functions as a passage for circulating the cooling air formed in the engine room. As a result, the cover body can be prevented from being abnormally high in temperature.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 10 denotes a supercharger. The supercharger 10 is connected to an intake pipe 11, and exhaust gas from the engine 12 is used to compress air taken in from the intake pipe 11. For this reason, the exhaust turbine 1 is located in the exhaust path from the engine 12.
The exhaust gas flowing through the exhaust turbine 13 rotates the turbine to compress the air taken in the supercharger 10 and supply the compressed air to the engine 12, thereby increasing the operating efficiency of the engine 12 to a high level. Can be maintained.

In the above points, there is no particular difference from the above-mentioned prior art. The casing of the exhaust turbine 13 is heated by the flow of the exhaust gas, and a required portion of the casing of the exhaust turbine 13 is surrounded by a cover 14 for shielding. The cover 14 includes a cover body 15 and a mounting plate 16. The cover body 15 is formed by bending a metal plate, and as is apparent from FIGS. 1 and 2, has a shape that almost completely covers the upper surface portion from one side surface of the exhaust turbine 13. I have. Here, the reason why the exhaust turbine 13 is covered with the cover 14 is to prevent an operator's hand or the like from touching. Therefore, since the members constituting the engine 12 are close to the surfaces other than the above-described surfaces, even if the members are not covered with the cover 14, there is no possibility that the worker or the like touches the surfaces. Moreover,
The cover body 15 is mounted so as not to be in contact with the casing of the exhaust turbine 13 and to have a certain amount of clearance therebetween.

The mounting plate 16 is for fixing the cover main body 15 in a state of surrounding the exhaust turbine 13. As is apparent from FIG. 2, the mounting plate 16 has an end portion of the cover main body 15. Support portion 16 fixed by means such as welding
a and a fixing portion 16b fixed to the exhaust turbine 13
And a connecting portion 16c connecting the supporting portion 16a and the fixed portion 16b. The connecting portions 16c are provided at three places, and therefore, the adjacent connecting portions 16c are provided.
An opening 17 is formed between c and 16c, and this opening 17 functions as a ventilation part.

Here, an exhaust pipe 18 is connected to the exhaust turbine 13, and exhaust gas from the engine 12 flows into the exhaust pipe 18, and from the exhaust pipe 18 through a muffler (not shown) to outside air. Will be released. And the exhaust pipe 1
A flange 18a is formed at an end of the exhaust pipe 8, and four bolts 19 are inserted through the flange 18a and screwed into the side surface of the casing of the exhaust turbine 13, thereby forming the exhaust pipe 18 and the exhaust pipe 18. The turbine 13 is fixed in a connected state.

The mounting plate 16 includes bolts 19 for connecting and fixing the exhaust pipe 18 to the exhaust turbine 13.
It is fixed using the. For this,
The inner end of the fixing portion 16b of the mounting plate 16 is approximately 180
°, and as shown in FIG. 3, at both ends of the arc-shaped end surface and at positions substantially intermediate between the two ends, as shown in FIG.
Bolt insertion holes 20 are formed at three places so as to have a positional relationship of about 90 ° with each other. Moreover, the arc-shaped end face has a size slightly larger than the outer diameter of the pipe body portion of the exhaust pipe 18 connected to the exhaust turbine 13. Therefore, the mounting plate 16 can be attached and detached by moving in a direction perpendicular to the axis of the exhaust pipe 18. The mounting plate 16 is configured to abut on the flange portion 18a on a surface as wide as possible. Then, with the mounting plate 16 in contact with the flange portion 18a, one bolt 19a of the four bolts 19 is directly screwed into the casing of the exhaust turbine 13 from the flange portion 18a, and the other three bolts 19 are screwed. The bolts 19 are inserted through the bolt insertion holes 20 of the mounting plate 16, further passed through the flange portion 18 a, and screwed into the exhaust turbine 13, whereby the mounting plate 16 is connected to the exhaust pipe by the three bolts 19. 18 and are fastened together with the flange portion 18a.

With the above configuration, even when the engine 12 is operating or immediately after the engine 12 is stopped, the exhaust turbine 1
Even if 3 is in a high heat state, since a portion of the outer surface of the exhaust turbine 13 that may be touched by a human hand or the like is substantially covered by the cover 14, there is no possibility of touching the exhaust turbine 13; You can work safely. The cover 14 is composed of a cover main body 15 and a mounting plate 16, and it is not necessary to use a special fixing tool or the like to fix the cover 14 at a predetermined position. Bolt 19 used to connect to exhaust turbine 13 covers 1
4, the number of parts of the cover 14 is significantly reduced.

To remove the cover 14, the three bolts 19 are removed from the flange 18a of the exhaust pipe 18. However, the remaining one bolt 19a
Can be maintained in a tightened state, so that the exhaust pipe 18
Is not likely to be separated from the exhaust turbine 13. In this state, the mounting plate 16 is brought into contact with the flange portion 18a, but the arc of the fixing portion 16b of the mounting plate 16 is substantially 180 °.
Therefore, the fixing portion 16b straddles the pipe body of the exhaust pipe 18. Then, the position of the mounting plate 16 is adjusted so that the bolt insertion holes 20 formed at three places in the mounting plate 16 are at predetermined positions corresponding to the bolt mounting portions in the flange portion 18a. Thereafter, the three detached bolts 19 are inserted into the respective bolt insertion holes 20 and tightened. Thereby, the mounting plate 16 is fixed in a state of being pressed against the flange portion 18a. In order to attach and detach the cover 14, an operation opposite to that described above may be performed.

As described above, the cover body 15 is attached to the mounting plate 16.
Although the cover main body 15 is connected in a cantilevered state, the cover body 15 is formed with a plurality of bent portions F (three in the drawing) in a direction protruding from the mounting plate 16, so that the cover Even if the main body 15 is formed thin in order to reduce the weight, the bending strength at the bent portion F extremely increases the bending strength. For this reason, even if vibration is transmitted from the exhaust pipe 18 to the mounting plate 16 to the cover main body 15, there is no possibility that resonance or the like is generated, the vibration resistance is excellent, and the generation of vibration is significantly suppressed. Moreover, the mounting plate 16 to which the cover body 15 is connected is the flange 1
8a, the mounting plate 16 is made thicker than the cover body 15, so that the stability of the cover 14 as a whole is extremely excellent and the strength in the mounted state is also excellent. It will be.

Although the mounting plate 16 is in contact with the flange portion 18a of the exhaust pipe 18, its cover body 15 is held in a non-contact state with the exhaust turbine 13, and furthermore, it is in contact with the outer surface of the casing of the exhaust turbine 13. By providing a sufficient gap with the cover body 15, heat of the exhaust turbine 13 is
Transmission to the user as much as possible.

By the way, in the engine room,
A heat exchanger such as a radiator is installed. In order to supply cooling air to the heat exchanger, a heat exchanger directly connected to the engine 12 is provided.
Alternatively, a cooling fan driven by an electric motor is provided. The flow of the cooling air by the cooling fan is in the direction of the arrow in FIG. 1, and the air flows not only in the area where the heat exchanger is arranged but also in the area where the engine 12 is arranged. In the flow of the cooling air in the engine room, the mounting plate 16 is located on the upstream side and the cover body 15
Extends substantially from the upstream side to the downstream side of the cooling air. In addition, the mounting plate 16 has an opening 17 serving as a ventilation portion between the connecting portions 16c. Therefore, the flow of the cooling air generated by the cooling fan not only can be obtained along the outer surface of the cover body 15 through the opening 17 but also the gap between the cover body 15 and the exhaust turbine 13. Will pass through the part. As a result,
Since there is no possibility that heat is trapped in this portion and the cover main body 15 is constantly exposed to the flow of the cooling air, the heat generation of the cover main body 15 is further suppressed. For this reason, even if a hand etc. touches the cover main body 15, it is safe.

[0021]

As described above, according to the present invention, a mounting plate is connected to one side of a cover body for covering an exhaust turbine, and the mounting plate is used to connect an exhaust pipe to a casing of the exhaust turbine. The structure is simple because the structure is simple and can be easily mounted around the exhaust turbine without using any special fixing tool.

[Brief description of the drawings]

FIG. 1 is a front view of an essential part showing an embodiment of the present invention and showing a state where a cover is attached to an exhaust turbine of an engine.

FIG. 2 is a right side view of FIG.

FIG. 3 is an external view of a cover.

FIG. 4 is a front view of an essential part showing a state in which a cover is attached to an exhaust turbine of an engine according to the related art.

FIG. 5 is a left side view of FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 supercharger 12 engine 13 exhaust turbine 14 cover 15 cover body 16 mounting plate 16a support portion 16b fixing portion 16c connecting portion 17 opening 18 exhaust pipe 18a flange portion 19, 19a bolt 20 bolt insertion hole

Claims (4)

[Claims] 1. A cover for covering an exhaust turbine connected to an exhaust pipe and connected to an exhaust pipe for supercharging combustion air supplied to an engine, the exhaust turbine comprising: A cover body, and a mounting plate connected to one side of the cover body.
In order to connect an exhaust pipe to a casing of the exhaust turbine, together with a flange portion provided on the exhaust pipe, the mounting plate is jointly fastened to a side surface of the exhaust turbine with a connecting bolt. Exhaust turbine cover for the engine. 2. The exhaust gas turbine according to claim 2, wherein the cover main body is provided with a plurality of bent portions in a direction away from a connecting portion to the mounting plate so as to cover a predetermined portion of a casing of the exhaust turbine. An exhaust turbine cover for an engine according to claim 1, wherein: 3. The mounting plate is formed with an approximately 180 ° arc-shaped fixing portion so as to bypass the pipe body of the exhaust pipe, and the fixing portion has a positional relationship of approximately 90 ° in the arc. The engine according to claim 1, wherein three bolt insertion holes are formed so as to form the bolts, and the bolts are inserted into the bolt insertion holes and then fastened to the side surface of the exhaust turbine. Exhaust turbine cover. 4. The exhaust turbine cover for an engine according to claim 1, wherein the mounting plate is provided with an opening for ventilation.