JPH056124U - Work machine engine - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents workers from coming into direct contact with dangerous exhaust pipes and exhaust turbines due to high temperatures during the operation of the work machine engine, and also uses cooling air from a fan for the work machine engine. To improve the cooling efficiency of the work machine engine. A bracket 15A for fixing the exhaust manifold 15 to the engine body has a substantially U-shaped cross section, and an exhaust manifold cover 33 that forms a cooling air passage B between the exhaust manifold 15 and the exhaust manifold 15 is attached. Above the manifold cover 33, a turbine cover 34 that covers the exhaust turbine 17 and forms a cooling air passage D between the exhaust turbine 17 and the turbine cover bracket 3 is provided.
5 is used to fasten the upper side of the bracket 15A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine for a working machine such as a hydraulic excavator, and particularly to an engine for a working machine in which a safety cover for preventing a fire or a burn is provided on an exhaust pipe or the like.

[0002]

[Prior Art]

 Hereinafter, a hydraulic excavator will be described as an example of a conventional working machine and will be described with reference to FIGS. 8 and 9.

In the figure, reference numeral 1 denotes a hydraulic excavator as a working machine, and the hydraulic excavator 1 has a lower traveling body 2, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a later-described structure. The work device 8 is generally configured. Here, the lower traveling structure 2 and the upper revolving structure 3 are respectively provided with traveling and revolving hydraulic motors (both not shown), and these hydraulic motors are driven by an engine 7 for a working machine, which will be described later. By supplying pressure oil from a hydraulic pump, the vehicle can run and turn.

On the other hand, the upper swing body 3 is composed of a driver's cab 4, a machine room 5, a counterweight 6 and the like. Here, in the machine room 5, a working machine engine 7 and a working machine engine 7 are provided. A hydraulic pump (not shown) or the like driven by the above is provided.

Reference numeral 8 denotes a working device provided in the front part of the upper swing body 3, and the working device 8 is provided with hydraulic cylinders 8A, 8B, 8C and the like, and the hydraulic cylinders 8A, 8B, 8C and the like are provided. The working device 8 is driven by supplying and discharging pressure oil from the hydraulic pump and expanding and contracting the rod of each hydraulic cylinder.

The hydraulic excavator 1 configured as described above supplies pressure oil from the hydraulic pump driven by the working machine engine 7 to the hydraulic cylinders 8A, 8B, 8C and the hydraulic motor to operate the working device 8. It is designed to drive to perform excavation work, and to drive a swing motor and a travel motor to carry and travel earth and sand.

Here, the working machine engine 7 will be described.

In the figure, reference numeral 9 denotes an engine main body which constitutes the working machine engine 7. The engine main body 9 has a cylinder head 11 on a cylinder block 10 having, for example, 6 cylinders (not shown). In each cylinder of the cylinder block 10, the fuel is exploded in a predetermined order to push down the piston and extract the rotational output from the crankshaft (both not shown).

Reference numeral 12 denotes an intake pipe attached to the cylinder head 11 of the engine body 9, and the intake pipe 12 is provided with a supercharger 13 fixed to the cylinder head 11 of the engine body 9 at an intermediate portion thereof. The supercharger 13 is configured to compress the air introduced from the tip end side of the intake pipe 12 and send the compressed air into each cylinder of the cylinder block 10.

Reference numeral 14 denotes an exhaust pipe attached to the front side of the cylinder head 11. The exhaust pipe 14 is composed of an exhaust manifold 15 and an outlet pipe 16, and is provided between the exhaust manifold 15 and the outlet pipe 16. An exhaust turbine 17, which will be described later, is provided in the vehicle. Here, the exhaust manifold 15 is attached to the cylinder head 11 using a plurality of brackets 15A, 15A, ... And bolts 15B, 15B, ..., and collects the exhaust gas exhausted from the exhaust port of the cylinder head 11 into the confluence portion 15C. It guides the exhaust turbine 17 at all.

Reference numeral 17 denotes an exhaust turbine provided on the cylinder head 11 of the engine body 9. The exhaust turbine 17 has a spiral casing 17A having a radius gradually increasing from the center, and an exhaust gas inside the casing 17A. The supercharger 13 is driven by the exhaust gas of high temperature and high pressure discharged from the cylinder head 11 to drive the supercharger 13. Further, the exhaust gas that rotates the impeller of the exhaust turbine 17 passes through the large-diameter outlet pipe 16 connected to the radial central portion of the casing 17A of the exhaust turbine 17, and then, as shown in FIG. It is guided to the muffler 18 provided at and is discharged into the atmosphere.

Reference numeral 19 denotes a cooling water inlet for cooling the cylinder block 10 and the like of the engine body 9. The cooling water inlet 19 is a radiator 20 arranged on the right side of the working machine engine 7 in FIG. (Refer to FIG. 8), the cooling water supplied from the radiator 20 is pumped by the water pump 21 to the water manifold 22 above the engine body 9. Then, the cylinder block 10 and the like are water-cooled by the cooling water supplied from the water manifold 22 to prevent the seizure of the piston and the like. Here, a cooling fan (not shown), which is driven to rotate by the engine 7 for the working machine, is provided between the radiator 20 and the engine 7 for the working machine, and the cooling fan is provided from the outside of the machine room 5 to the radiator 20. The working air engine 7 is air-cooled by circulating the outside air introduced through the cooling air in the direction of arrow A.

The working machine engine 7 according to the prior art is configured as described above, and the working machine engine 7 explodes fuel in each cylinder of the cylinder block 10 to take out rotational output from the crankshaft and at the same time The exhaust gas generated at this time is used to rotate the impeller inside the exhaust turbine 17, and the supercharger 13 is driven by the exhaust turbine 17 to improve the intake efficiency. The cylinder block 10 and the like are cooled by cooling water that circulates between the radiator 20 and the working machine engine 7, and the exhaust pipe 14 and the like pass through the radiator 20 and are guided from the cooling fan in the arrow A direction. The work air engine 7 is prevented from overheating due to air cooling by the cooling air.

[0014]

[Problems to be solved by the device]

 By the way, in the above-described conventional hydraulic excavator, an operator needs to enter the machine room 5 when checking the oil level of the engine oil or checking the engine body 9 and the like.

Here, in the working machine engine 7, the exhaust pipe 14 is exposed to the outside of the engine body 9, and the exhaust pipe 14 has an extremely high temperature due to high heat from the exhaust manifold 15 and the exhaust turbine 17 and the like from the exhaust gas. Therefore, there is a problem that it is dangerous if the worker's body touches it, and if oil leaked from the hydraulic pump or the like adheres to the exhaust pipe 14, a fire may occur.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can eliminate the risk of burns of workers by using the cooling air from a cooling fan, and the oil content can be attached. It is an object of the present invention to provide an engine for a working machine capable of preventing the occurrence of fire due to.

[0017]

[Means for Solving the Problems]

 The feature of the configuration adopted by the present invention to solve the above-mentioned problems is that a safety cover for covering the exhaust pipe and the exhaust turbine from the outside is provided in the engine body, and a cooling is provided between the safety cover and the exhaust pipe, the exhaust turbine. This is because the cooling air passages through which the cooling air from the fan circulates were formed.

[0018]

[Action]

 With the above configuration, it is possible to prevent the safety cover from being overheated by the cooling air flowing through the cooling air passage, and prevent the worker's body from directly contacting the exhaust pipe or oil from adhering to the exhaust pipe. can do.

[0019]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. It should be noted that the same components as those of the above-described conventional technique are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a working machine engine according to the present embodiment. The working machine engine 31 is substantially the same as the working machine engine 7 of the prior art, and the engine main body 9 and the intake pipe 12 and Although it is composed of the exhaust pipe 14 and the like, the working machine engine 31 is provided with an exhaust manifold 15 that constitutes the exhaust pipe 14, a safety cover 32 that covers the exhaust turbine 17 and the like from the outside.

Here, the safety cover 32 is for mounting the exhaust manifold cover 33 that covers the exhaust manifold 15, the turbine cover 34 that covers the exhaust turbine 17, and the turbine cover 34 to the engine body 9 as described later. It is composed of a turbine cover bracket 35.

Reference numeral 33 denotes an exhaust manifold cover. As shown in FIG. 4, the exhaust manifold cover 33 is formed into a rain gutter shape by bending a long thin metal plate into a substantially U-shaped cross section, and has a flat plate portion. 33A and upper and lower bent portions 33B and 33C. Here, the exhaust manifold cover 33 is provided with notches 33D and 33D at the bent portion 33B side and at the intermediate portion in the longitudinal direction, and the notches 33D and 33D are provided between the notches 33D and the upper side in FIG. Mounting portions 33F that project and are provided with three mounting holes 33E, 33E, ... At predetermined intervals in the longitudinal direction are formed. The exhaust manifold cover 33 has three mounting bolts 15B among the mounting bolts 15B, 15B, ... For mounting the exhaust manifold 15 to the cylinder head 11 via each bracket 15A. By being inserted into the mounting hole 33E, it is fastened and fixed to the cylinder head 11 together with each bracket 15A. Further, as shown in FIG. 3, a cooling air passage B is formed between the exhaust manifold cover 33 and the exhaust manifold 15, the cooling air passage B being open at both ends and having a constant gap.

Reference numeral 34 denotes a turbine cover. As shown in FIGS. 5 and 6, the turbine cover 34 includes a pair of left and right reinforcing pipes 36, 36, an upper flange plate 37 and a lower flange plate 38 which will be described later. , A front protection plate 39 and a pair of side protection plates 40, 40. Here, each of the reinforcing pipes 36 is formed by bending in a substantially U shape, and the upper end portion 36A side is formed longer than the lower end portion 36B side by a predetermined dimension C.

Reference numerals 37 and 38 respectively denote an upper flange plate and a lower flange plate attached by welding to the upper end portion 36A and the lower end portion 36B of each of the reinforcing pipes 36, and the flange plates 37 and 38 have widths. Two bolt insertion holes 37A, 37A, 38A, 38A are provided from the center in the direction, and each flange plate 37, 38 is fastened to a turbine cover bracket 35 described later with each bolt 44 described below. It has become.

Reference numeral 39 denotes a front protection plate welded to each reinforcement pipe 36 along the front side of each reinforcement pipe 36. On both sides of the front protection plate 39, the upper end side 36 A side of each reinforcement pipe 36 is provided. To the lower end 36B side, left and right side face protection plates 40, 40, which are formed by curving in a substantially J shape while gradually reducing the width, are attached to each reinforcing pipe 36 by welding.

Next, the bracket 35 for the turbine cover will be described with reference to FIG.

Here, the turbine cover bracket 35 is composed of an engine side mounting portion 41, a connecting plate 42, and an upper end side cover mounting portion 43, which will be described later.

In the figure, reference numeral 41 denotes an engine-side mounting portion, which is made of a thick metal plate material and has screw holes 41 A having female screws (not shown) at four corners. , 41A, ... Are spaced apart in a square shape from the base end portion 41B, and are bent from one end side of the base end portion 41B into a substantially L shape with an appropriate radius of curvature, and each side of the base end portion 41B is bent. A rectangular rectangular lower end side cover mounting portion 4 that extends in one direction to a length of about twice and has two screw holes 41C, 41C having female threads (not shown) on the tip side. 1D and.

Reference numeral 42 denotes a connecting plate, which is made of a steel plate having a substantially L-shaped cross section, and the base end side of the connecting plate 42 is welded to the upper side of the base end portion 41 B of the engine side mounting portion 41 by welding. It is fixed.

Reference numeral 43 denotes an upper end side cover mounting portion, and the upper end side cover mounting portion 43 is made of a steel plate having a substantially L-shaped cross section and extends parallel to the lower end side cover mounting portion 41 D of the engine side mounting portion 41. It is fixed to the side surface on the tip end side of the connecting plate 42 by welding so that a height difference of a predetermined dimension C is generated between the lower end side cover mounting portion 41D. The upper cover mounting portion 43 is provided with two bolt insertion holes 43A, 43A at positions corresponding to the screw holes 41C of the lower cover mounting portion 41D.

The turbine cover bracket 35 has the above-described structure. To mount the turbine cover 34 on the turbine cover bracket 35, as shown in FIG. 3, first, the lower end side of the engine side mounting portion 41 is mounted. The lower flange plate 38 of the turbine cover 34 is abutted against the cover mounting portion 41D, and the upper flange plate 37 of the turbine cover 34 is abutted against the upper end side cover mounting portion 43, respectively. Next, the lower flange plate 38 is fixed to the lower end side cover mounting portion 41D by inserting the bolts 44, 44 into the bolt insertion holes 38A, 38A and tightening the screw holes 41C, 41C, respectively, and the upper end side cover The mounting portion 43 and the upper flange plate 37 are configured such that two bolts 44, 44 are inserted into the respective bolt insertion holes 43A, 43A and 37A, 37A and fixed by using nuts 45, 45.

Then, four long bolts 46, 46, ... Are inserted into the base end portion 41B of the bracket 35 for the turbine cover, and the exhaust manifold 15 is mounted on the upper surface of the bracket 15A attached to the cylinder head 11. It is installed by tightening. At this time, the turbine cover 34 is formed with a cooling air passage D having a constant gap outside the exhaust turbine 17 (see FIG. 3), and the lower end side of the cooling air passage D communicates with the cooling air passage B of the exhaust manifold cover 33. It is supposed to do.

The working machine engine 31 according to the present embodiment has the above-described configuration, and its basic operation is not significantly different from that of the conventional art.

However, in this embodiment, the exhaust manifold cover 33 having a substantially U-shaped cross section is attached so as to cover the exhaust manifold 15, and both ends are provided between the exhaust manifold cover 33 and the exhaust manifold 15. A turbine cover 34 is provided above the notch 33D so as to form a cooling air passage B having a constant open gap and to be continuous with the notch 33D formed in the middle of the exhaust manifold cover 33. Since the cooling air passage D having a constant gap is formed between the turbine cover 34 and the exhaust turbine 17, the following effects are obtained.

First, by blowing the cooling air in the direction of arrow A from the cooling fan, a part of the cooling air flows along the exhaust manifold 15 and the exhaust manifold cover 33 in the cooling air passage B whose both ends are open. Will flow. Then, in addition to the cooling air in the direction of arrow A, the cooling air is supplied from the lower cooling air passage B to the cooling air passage D continuing from the notch 33D of the exhaust manifold cover 33 to the upper side. As a result of being cooled by these cooling air, the exhaust manifold cover 33 and the turbine cover 34 are effectively cooled on their surfaces even though they are attached to the engine body 9, and as much as possible. Temperature rise is suppressed.

Therefore, according to the present embodiment, for example, at the time of inspection work, a worker may enter the machine room 5 and approach the working machine engine 31, and the worker's body may touch the working machine engine 31. Even so, the exhaust manifold 15 and the exhaust turbine 17, which become particularly high in temperature, are covered with the exhaust manifold cover 33 and the turbine cover 34, and the exhaust manifold cover 33 and the turbine cover 34 cool the cooling air passages B and D. Since it is cooled by the wind, the risk of burns to workers can be greatly reduced.

Further, since the exhaust manifold 15 and the exhaust turbine 17 which are particularly high in temperature are covered with the exhaust manifold cover 33 and the turbine cover 34, oil and the like are prevented from adhering to the exhaust manifold 15 and the exhaust turbine 17. This can greatly reduce the risk of smoking and ignition and improve safety.

Further, since the cooling air passages B and D are formed, the cooling air can be made to flow along the exhaust manifold 15 and the exhaust turbine 17 of the engine body 9 where the temperature is particularly high, so that these can be cooled efficiently. It can be carried out.

In the above embodiment, the case where the working machine engine of the present invention is applied to a hydraulic excavator has been described as an example. However, the present invention is not limited to this, and for example, work of a hydraulic crane or the like. You may use it for the machine.

[0040]

[Effect of the device]

 As described above, according to the present invention, the engine body is provided with the safety cover for covering the exhaust pipe and the exhaust turbine from the outside, and the cooling air from the cooling fan is provided between the safety cover and the exhaust pipe, the exhaust turbine. Since the cooling air passage through which the air flows is formed, the safety cover can prevent the worker's body from coming into contact with and oil from adhering to the exhaust pipe and the exhaust turbine which become particularly hot during the operation of the working machine engine. In addition, it is possible to prevent the safety cover from becoming hot due to the cooling air flowing in the cooling air passage, which can ensure the safety of the workers working in the machine room and prevent the occurrence of fires and other highly safe work. It can be a machine engine.

Further, since the cooling air is distributed along the cooling air passage, the exhaust manifold and the exhaust turbine can be efficiently cooled, and the durability and life of the working machine engine can be improved. You can

[Brief description of drawings]

FIG. 1 is a partial front view showing an enlarged main part of an engine for a working machine according to an embodiment of the present invention.

FIG. 2 is a plan view showing an exhaust manifold, an exhaust turbine and a safety cover shown in FIG.

FIG. 3 is an enlarged cross-sectional view of the exhaust manifold, the exhaust turbine, and the safety cover in the direction of arrows III-III in FIG.

FIG. 4 is a perspective view showing an exhaust manifold cover.

5 is a front view of the turbine cover shown in FIG.

6 is a cross-sectional view showing a turbine cover in the direction of arrows VI-VI in FIG.

FIG. 7 is a perspective view showing a bracket for a turbine cover.

FIG. 8 is an overall view showing a hydraulic excavator according to a conventional technique.

FIG. 9 is a front view showing an engine for a working machine according to a conventional technique.

[Explanation of symbols]

 1 Hydraulic Excavator (Work Machine) 5 Machine Room 9 Engine Body 10 Cylinder Block 11 Cylinder Head 12 Intake Pipe 13 Supercharger 14 Exhaust Pipe 15 Exhaust Manifold 17 Exhaust Turbine 20 Radiator 31 Work Machine Engine 32 Safety Cover 33 Exhaust Manifold Cover 34 Turbine cover 35 Bracket for turbine cover B, D Cooling air passage

Claims (1)

[Claims for utility model registration] [Claim 1] An engine main body provided in a machine room of a working machine and having a plurality of cylinders, and an intermediate portion in order to supply intake air into each cylinder of the engine main body. An intake pipe provided with a supercharger, an exhaust pipe for leading out exhaust gas discharged from each cylinder of the engine body to the outside, and an exhaust pipe provided in the middle of the exhaust pipe for utilizing the flow of the exhaust gas In an engine for a working machine including an exhaust turbine that drives a supercharger and a cooling fan that is attached to the engine body and that cools the engine body together with a radiator, the engine body includes the exhaust pipe and the exhaust turbine from the outside. A safety cover for covering is provided, and a cooling air passage through which cooling air from the cooling fan flows is formed between the safety cover and the exhaust pipe and the exhaust turbine. Working machine engine that.