JP6448593B2 - Engine driven work machine - Google Patents

Description

  The present invention relates to an engine-driven work machine such as an engine generator, an engine welder, and an engine compressor.

  In an outdoor work site such as road construction, an engine-driven work machine in which a work machine main body such as an engine, a generator driven by the engine, a welding machine, and a compressor is housed in one casing is operating. When such an engine-driven work machine is installed in a small space, it is necessary to reduce the installation area by reducing the size of the engine-driven work machine.

  Therefore, an engine-driven work machine as shown in Patent Document 1 has been proposed. In the engine-driven work machine, the casing is divided into upper and lower parts, the engine, the work machine body driven by the engine, the engine muffler are housed in the lower chamber, and an intake port for taking in cooling air is provided. A muffler exhaust pipe is disposed in the upper chamber in a meandering or bending manner on the horizontal plane, and the exhaust exhaust for the muffler is introduced into the upper chamber from the lower chamber by introducing cooling exhaust air that cools the engine, work implement main body, and muffler. The exhaust gas discharged from the pipe and the cooling exhaust air are mixed in the upper chamber and discharged from one side surface of the upper chamber to the outside.

  FIG. 7 is a view showing such a conventional engine-driven working machine. In FIG. 7, 21 is a lower chamber, 22 is an upper chamber, 23 is an engine, 23a is a cylinder head, 23b is an engine fan, 23c is an engine shroud, 24 is a generator, 24a is a generator fan, 24b is a generator cover, Reference numeral 25 denotes an engine exhaust pipe, 26 denotes a muffler, 27 denotes a muffler exhaust pipe, 28 denotes an engine exhaust duct, 29 denotes a muffler cover, 30 denotes an electric fan, 31 denotes a lower air inlet, and 32 denotes an upper air inlet.

  The engine 23 is covered with an engine shroud 23c, the engine exhaust pipe 25 is covered with an engine exhaust duct 28, the muffler 26 is covered with a muffler cover 29, and from the lower and upper intake ports 31, 32 by an engine fan 23b. The sucked cooling air is sent from the engine shroud 23c through the engine exhaust duct 28 into the muffler cover 29, and the engine 23, the engine exhaust pipe 25 and the muffler 26 are cooled. The generator fan 24a introduces cooling air sucked from the lower and upper intake ports 31 and 32 into the generator 24 to cool the generator, and then the engine exhaust air through the generator cover 24b. The air is discharged into the duct 28. The air thus discharged contributes to cooling of the engine exhaust pipe 25 and the muffler 26.

  Further, the cooling air sucked from the upper air inlet 32 is cooled by being applied to a control unit (not shown) disposed in the upper part of the lower chamber 21, and then sent into the engine shroud 23c by the engine fan 23b. The engine 23, the engine exhaust pipe 25, and the muffler 26 are cooled.

  After cooling the engine 23, the engine exhaust pipe 25, and the muffler 26 in this manner, the cooling exhaust air is sent into the upper chamber 22 by the electric fan 30, and the muffler disposed so as to meander or bend on the horizontal plane. After cooling the exhaust pipe 27, the exhaust discharged from the muffler exhaust pipe 27 and the cooling exhaust air are mixed in the upper chamber 24 and discharged from one side of the upper chamber 22 to the outside.

  In this way, the conventional engine-driven work machine is configured to reduce the installation area and suppress the height.

JP-A-10-131762

  However, in the conventional engine-driven work machine, the engine exhaust duct 28 is connected to the muffler cover 29, but the engine 23 is vibrated vigorously, and the vibration is transmitted to the muffler cover 29 via the engine exhaust duct 28. Therefore, there has been a problem that the connecting portion between the engine exhaust duct 28 and the muffler cover 29 and the muffler cover 29 may be damaged by vibration.

  In view of such problems, the present invention prevents the engine exhaust duct from connecting to the muffler storage section such as the muffler cover 29, the muffler storage section, and the engine exhaust duct itself due to engine vibration. The purpose is to make it.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is to house an engine, a work machine body driven by the engine, an engine exhaust pipe of the engine, and a muffler to which the engine exhaust pipe is connected in a casing. The engine-driven working machine, wherein the engine covers an intake side with a cover, an engine intake port is provided at one end of the cover, an engine exhaust port is provided at an engine block on the other end side, and the engine exhaust port is provided as an exhaust port. The exhaust duct is covered with a duct, and the exhaust duct is connected to the lower end of the muffler storage section through which the muffler is housed and the cooling air is passed by the engine exhaust duct, and the exhaust duct and the engine exhaust duct are connected to each other. An anti-vibration member is interposed between the joint portion and the joint portion between the engine exhaust duct and the muffler storage portion.

  The invention according to claim 2 of the present application is the invention according to claim 1, wherein the vibration isolator is a round anti-vibration rubber and is provided at a joint portion between the exhaust duct and the engine exhaust duct. The type anti-vibration rubber and the round anti-vibration rubber provided at the joint portion between the engine exhaust duct and the muffler storage portion are orthogonal to each other.

  The invention according to claim 3 of the present application is the invention according to claim 2, wherein the round antivibration rubber includes a joint portion between the exhaust duct and the engine exhaust duct, and the engine exhaust duct. And two or more of them are respectively attached to the left and right symmetrical positions of the joint portion of the muffler storage portion.

  The invention according to claim 4 of the present application is the invention according to claim 1, 2, or 3, wherein the exhaust duct and the engine exhaust duct, and the engine exhaust duct and the muffler storage portion are provided. A sealing material is interposed between the two.

The present invention has the following effects.
That is, in the invention according to claim 1, the engine exhaust duct that connects the engine exhaust port and the lower end portion of the muffler storage unit that stores the muffler inside, the joint portion of the engine exhaust duct and the exhaust port duct, and the engine exhaust port. Since a vibration isolating member is interposed at the joint between the wind duct and the muffler storage part, the connection between the engine exhaust duct and the muffler storage part, the muffler storage part, and the engine exhaust duct are damaged by engine vibration. Can be prevented.

According to a second aspect of the present invention, in the engine-driven work machine according to the first aspect, a round anti-vibration rubber is used as the anti-vibration member, and a joint portion between the exhaust duct and the engine exhaust duct is used. Since the round anti-vibration rubber provided and the round anti-vibration rubber provided at the joint portion between the engine exhaust duct and the muffler storage portion are in an orthogonal relationship with each other. Vibration and vibration in the direction orthogonal thereto can be effectively absorbed by the combination of the compression direction and the shear direction of the round vibration-proof rubber.

  According to a third aspect of the present invention, in the engine-driven work machine according to the second aspect, the round vibration-proof rubber includes a joint portion between the exhaust duct and the engine exhaust duct, and the engine exhaust duct. Since two or more are attached to the left and right symmetrical positions of the joint portion between the wind duct and the muffler storage part, the round vibration-proof rubber receives a plurality of vibrations acting in the shearing direction with a small spring constant. By setting it in a symmetrical position, the supporting fulcrum is widened and the vibration isolation effect is improved.

  According to a fourth aspect of the present invention, in the engine-driven work machine according to the first, second, or third aspect, between the exhaust duct and the engine exhaust duct, and between the engine exhaust duct and the muffler. Since the sealing material is interposed between the housing portion and the storage portion, the engine exhaust air can be sealed against the movement of the engine exhaust air duct in any direction.

It is a figure which shows the engine drive working machine which concerns on one Example of this invention. It is a figure which shows a round type vibration proof rubber. It is a figure which shows the state which attached the exhaust duct to the engine of the engine drive working machine of FIG. It is a figure which shows an air exhaust duct. It is a figure which shows the state which attached the engine exhaust duct to the engine of the engine drive working machine of FIG. It is a figure which shows an engine exhaust duct. It is a figure which shows the conventional engine drive working machine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing an engine-driven work machine according to an embodiment of the present invention. FIG. 1 (A) is a view of the inside of the work machine from the front, and FIG. 1 (B) is also from the left side. FIG. 1C shows a view as seen from above. In FIG. 1, 1 is an engine, 2 is a generator as a work machine body, 3 is a lower chamber, 4 is a middle chamber, 5 is an upper chamber, 6 is an exhaust duct, 7 is an engine exhaust pipe, 8 is a muffler, 9 Is a muffler exhaust pipe, 10 is an engine exhaust duct, 11 is a muffler chamber for housing the muffler 8, 12 is a first exhaust port, 13 is a fan chamber, 14 is an electric fan, 15 is a second exhaust port, and 16 and 17 are It is a round anti-vibration rubber.

  The work machine housing is divided into upper, middle, and lower three chambers. The engine 1 and the generator 2 are housed in the lower chamber 3, and the engine 1 is covered with a cover 1a on the intake side. The cover 1a is provided with an intake port 1b at one end and an engine exhaust port 1c at the other end of the engine block. And the exhaust duct 6 is attached to the outer side of the engine exhaust 1c.

  The middle chamber 4 is provided with a muffler chamber 11 in which a muffler 8 connected to the engine exhaust pipe 7 is stored in the vertical direction so that cooling air can be passed through the muffler chamber 11. To do. Therefore, the engine exhaust duct 10 is connected between the outlet side of the exhaust duct 6 and the lower end of the muffler chamber 11.

  In addition to the muffler chamber 11, the middle chamber 4 is also provided with a fan chamber 13 including an electric fan 14. The bottom of the fan chamber 13 is open and communicates with the lower chamber 3. In addition, the electric fan 14 of the fan chamber 13 is provided between the fan chamber 13 and the muffler chamber 11 so that air is sent from the fan chamber 13 to the muffler chamber 11.

  A round antivibration rubber 16 is provided at a joint portion between the outlet side of the exhaust duct 6 and the engine exhaust duct 10, and a round shape is provided at a joint portion between the engine exhaust duct 10 and the lower end portion of the muffler chamber 11. Anti-vibration rubber 17 is provided to prevent damage to the connecting portion between the engine exhaust duct 10 and the muffler chamber 11, the muffler chamber 11, and the engine exhaust duct 10 due to vibration of the engine 1.

  As shown in FIG. 2, the round anti-vibration rubber 16 is formed by adhering a metal disc 16b having a fixing bolt 16c vertically attached to the center on the upper and lower surfaces of a cylindrical rubber material 16a. . The round anti-vibration rubber having such a structure has a large spring constant and a large allowable load in the direction in which the rubber material 16a is compressed (Z direction in the figure), and shears the rubber material 16a (in the X direction in the figure). Has the characteristics that the spring constant is small and the allowable load is also small. The same applies to the round vibration-proof rubber 17.

  In the present invention, by devising a method of attaching the round vibration isolating rubber whose characteristics are greatly different between the compressing direction and the shearing direction, the vibration in the output shaft direction of the engine 1 is also improved. Effectively copes with vibration in the orthogonal direction.

  That is, the round antivibration rubber 16 attached to the joint portion between the outlet side of the exhaust duct 6 and the engine exhaust duct 10 is attached so that the fixing bolt 16 c is parallel to the output shaft of the engine 1. Further, the round anti-vibration rubber 17 attached to the joint portion between the engine exhaust duct 10 and the lower end portion of the muffler chamber 11 is attached so that the fixing bolt 16 c is in the vertical and vertical direction with respect to the output shaft of the engine 1.

  Thus, by providing the circular anti-vibration rubbers 16 and 17 at both ends of the engine exhaust duct 10 in an orthogonal relationship with each other, it is also orthogonal to the vibration in the output shaft direction of the engine 1. Even in the vibration direction, the circular vibration-proof rubbers 16 and 17 share each other so that they can be effectively absorbed.

  Next, how to install the engine exhaust duct 10 will be described in detail. FIG. 3 is a view showing a state where the exhaust duct 6 is attached to the engine 1, and FIG. 4 is a view showing the exhaust duct 6. An exhaust duct 6 is attached to the engine exhaust duct 1c, and one end of the engine exhaust duct 10 is connected to the exhaust duct 6.

  As shown in FIG. 4, the air exhaust duct 6 has a connecting plate 6b attached to the front surface of a frame constituted by a top plate 6c, side plates 6e and 6f, and a bottom plate 6d, and a sealing material 6a adhered to the surface. Yes. The left and right side plates 6e and 6f are provided with anti-vibration rubber mounting brackets 6g and 6g for attaching the round anti-vibration rubber 16 at left and right symmetrical positions, and for fixing the exhaust duct 6 to the engine 1. The engine mounting brackets 6h and 6i are provided. Further, the engine facing edges of the top plate 6c and the bottom plate 6d are matched to the shape of the outer edge of the engine 1 so that there is no gap, and an opening is provided on the rear side so that exhaust air from the engine 1 passes through. 6j is provided.

As shown in FIG. 3, the exhaust duct 6 is installed so as to cover the engine exhaust port 1c, and is fixed to the engine mounting brackets 6h and 6i through bolts. Then, the round anti-vibration rubber 16 is attached to the left and right anti-vibration rubber mounting brackets 6g and 6g so as to be parallel to the output shaft of the engine 1. As shown in FIG. 5, the engine exhaust duct 10 is connected to the connection plate 6 b of the exhaust duct 6 through the round antivibration rubber 16 so as to sandwich the sealing material 6 a.

  FIG. 6 is a view showing an engine exhaust duct. The engine exhaust duct 10 includes two parts, a U-shaped section formed by a top plate 10e, a side plate 10f, and a bottom plate 10g, and a plate-shaped portion formed by a separation side plate 10d. The reason why the engine exhaust duct 10 can be separated into two in this way is that the engine exhaust duct is connected later even when the engine exhaust pipe 7 is connected to the exhaust pipe connecting portion 1d (see FIG. 3) of the engine 1. This is because 10 can be attached.

  On the side connected to the exhaust duct 6, a connection plate 10 i that abuts against the seal material 6 a of the exhaust duct 6 and an anti-vibration rubber mounting bracket 10 c are provided, and the round anti-vibration rubber is attached to the anti-vibration rubber mounting bracket 10 c. By connecting 16, the engine exhaust duct 10 is connected to the exhaust duct 6.

  On the opposite side, the side connected to the muffler chamber 11 is provided with a frame-like muffler chamber connecting portion 10h extending vertically upward, and a connecting plate 10j is provided on the inner periphery of the upper end thereof. A sealing material 10b is provided on the upper surface. Further, an anti-vibration rubber mounting bracket 10a is provided at the left and right symmetrical position of the upper end of the muffler chamber connecting portion 10h, and a round anti-vibration rubber 17 is attached thereto, so that the engine exhaust duct 10 is attached to the lower end portion of the muffler chamber 11. Connecting.

  As a result, the round anti-vibration rubbers 16 and 17 at both ends of the engine exhaust duct 10 are provided so as to be orthogonal to each other, and also against vibrations in the output shaft direction of the engine 1. It can also effectively absorb vibrations in the direction perpendicular to it. Further, by providing the circular anti-vibration rubbers 16 and 17 at the left and right symmetrical positions on the exhaust duct 6 side and the muffler chamber 11 side, respectively, a plurality of vibrations acting in the shearing direction having a smaller spring constant than the compression direction. Since it is received with a round anti-vibration rubber, it can be supported without problems.

  Further, the sealant 6a and the sealant 10b are interposed between the exhaust duct 6 and the engine exhaust duct 10 and between the engine exhaust duct 10 and the muffler chamber 11, respectively. The engine exhaust air can be reliably sealed against the movement of the wind duct 10 in any direction.

  In addition, although the said Example demonstrated the case where the exhaust direction of the engine exhaust port 1c of the engine 1 was made parallel with the output shaft of the engine 1, it is not limited to it, The exhaust direction of the engine exhaust port 1c The present invention can also be applied to a case where is set in a direction perpendicular to the output shaft of the engine 1. Even in such a case, the round anti-vibration rubbers 16 and 16 provided at the joint portion between the exhaust duct 6 and the engine exhaust duct 10 and the joint portion between the engine exhaust duct 10 and the muffler chamber 11 are provided. The provided round anti-vibration rubbers 17 and 17 are orthogonal to each other.

DESCRIPTION OF SYMBOLS 1 Engine 1a Cover 1b Intake port 1c Engine exhaust port 1d Exhaust pipe connection part 2 Generator 3 Lower chamber 4 Middle chamber 5 Upper chamber 6 Exhaust port duct 6a Sealing material 6b Connection plate 6c Top plate 6d Bottom plate 6e, 6f Side plate 6g Vibration isolation Rubber mounting bracket 6h, 6i Engine mounting bracket 6j Opening 7 Engine exhaust pipe 8 Muffler 9 Muffler exhaust pipe 10 Engine exhaust duct 10a, 10c Anti-vibration rubber mounting bracket 10b Sealing material 10d Separation side plate 10e Top plate 10f Side plate 10g Bottom plate 10h Muffler Chamber connection parts 10i, 10j Connection plate 11 Muffler chamber 12 First exhaust port 13 Fan chamber 14 Electric fan 15 Second exhaust port 16, 17 Round anti-vibration rubber

Claims (4)

  An engine-driven work machine in which an engine, a work machine body driven by the engine, an engine exhaust pipe of the engine, and a muffler to which the engine exhaust pipe is connected are housed in a housing, the engine covering an intake side The engine exhaust port is provided at one end of the cover, the engine exhaust port is provided at the engine block on the other end side, the engine exhaust port is covered with an exhaust duct, and the exhaust duct is formed by the engine exhaust duct. A muffler is housed inside and communicated with a lower end portion of a muffler storage portion through which cooling air passes, and a joint portion between the exhaust duct and the engine exhaust duct, and the engine exhaust duct and the muffler storage portion An engine-driven work machine characterized in that an anti-vibration member is interposed in a joint portion.   The anti-vibration member is a round anti-vibration rubber, and a round anti-vibration rubber provided at a joint part between the exhaust duct and the engine exhaust duct, and a joint part between the engine exhaust duct and the muffler storage part The engine-driven work machine according to claim 1, wherein the round vibration-proof rubber provided on the engine is orthogonal to each other.   Two or more round anti-vibration rubbers are provided at left and right symmetrical positions of the joint portion between the exhaust duct and the engine exhaust duct and the joint portion between the engine exhaust duct and the muffler storage portion. The engine-driven work machine according to claim 2, wherein the engine-driven work machine is attached.   The seal material is interposed between the exhaust duct and the engine exhaust duct, and between the engine exhaust duct and the muffler storage portion. The engine-driven work machine described.

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