JP4136752B2 - Muffler mounting device for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a muffler mounting device that silences exhaust sound of an engine mounted on a construction machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, construction machines such as hydraulic excavators have a power engine mounted on a vehicle body, and exhaust gas discharged from the engine is silenced by a muffler and then released to the atmosphere.
In addition, since a muffler that silences the exhaust noise is large in a vehicle equipped with an engine with a large displacement such as a construction machine, conventionally, the muffler main body is attached to the upper part of the engine housed in the engine room via a bracket. It is often attached (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-28266 (FIG. 2)
[0004]
The engine cooling device described in Patent Document 1 has a structure in which a bracket is installed on the upper part of the engine housed in the engine compartment and a muffler is attached on the bracket.
On the other hand, as another muffler mounting device, for example, the one shown in FIGS. 6 and 7 is known.
[0005]
In the muffler mounting device, a bracket b is fixed to an end of an engine a mounted on the vehicle body.
The muffler body c is placed on the bracket b from above on a receiving seat d having substantially the same curvature as the outer peripheral surface of the muffler body c.
Further, for example, two U bolts e are fitted on the outer peripheral portion of the muffler main body c from above, and the tip of each U bolt e is preliminarily attached to a mounting plate f projecting horizontally from the receiving seat d. The muffler body c is firmly fixed to the bracket b by tightening a nut h that is fitted into the drilled mounting hole g and screwed to the tip.
[0006]
[Problems to be solved by the invention]
However, the conventional mufflers described in Patent Document 1 and FIGS. 6 and 7 are each provided with a partition wall k that divides the inside of a cylindrical body i whose muffler body c is made of metal into a plurality of expansion chambers j. The bracket b that fixes the muffler main body c to the engine a has a structure that supports the center side from the lower side of the partition wall k provided in the muffler main body c as shown in FIG.
For this reason, when the nut h screwed on the tip of the U bolt e is strongly tightened, the cylinder body i is deformed. Therefore, the nut h cannot be tightened too strongly, but if the nut h is weakly tightened, the vibration of the engine a This causes a problem that the muffler main body c is rattled or the nut h is loosened and the attachment of the muffler main body c is incomplete.
[0007]
Further, since the weight of the muffler main body c concentrates on the support portion of the bracket b, or excessive inertia acts on the muffler main body c while the construction machine is running or working, the cylinder i that contacts the support portion of the bracket b is provided. There is also a problem that the concave portion is locally recessed, and as a result, the fastening force of the U-bolt e is reduced, and the mounting portion of the muffler main body c is loose.
Further, when tightening or loosening the nut h screwed to the tip of the U bolt e attached downward using the tool p as shown in FIG. 6, the exhaust pipe m connected to the muffler body c, The muffler cover n and the like covering the side of the muffler main body c get in the way, and the work of tightening or loosening the nut h becomes a troublesome work, and there are problems such as poor workability.
[0008]
The present invention has been made to remedy such conventional problems, and it is an object of the present invention to provide a muffler attachment device for a construction machine in which the muffler body does not deform even if the fastening means for fixing the muffler body is strongly tightened. It is what.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a muffler mounting device for a construction machine according to the present invention is a muffler mounting device for a construction machine for mounting a muffler body that silences noise in exhaust gas discharged from an engine, and is provided in the muffler body. The partition part is composed of a support means for supporting the partition wall part from at least two sides on the lower side and the side, and a fastening means for fastening the muffler body to a mounting portion of the support means for supporting the muffler body from the side.
[0010]
With the above configuration, when the muffler main body is tightened by the fastening means, the tightening force is supported by the support means for supporting the portion where the strength is increased by the partition provided in the muffler main body. Even if fastened, the muffler body does not deform, and the muffler body can be firmly fixed to the support means, so even if vibration or inertia is applied to the muffler body during running or work, the muffler body There is no rattling or incomplete installation.
Also, since the fastening means can be tightened or loosened on the side of the fastening means, the muffler can be attached or removed without being obstructed by the exhaust pipe or muffler cover installed around the engine. Compared with, workability is further improved.
[0011]
In order to achieve the above object, a muffler mounting device for a construction machine according to the present invention comprises a supporting means comprising a mounting portion and a supporting portion that supports the muffler body from below, and the mounting portion is fixed to the engine, and the mounting portion. The muffler body is fastened to the support means so that the outer peripheral surface of the muffler body is in contact with the support portion.
[0012]
With the above configuration, the attachment part supports the fastening force when fastening the muffler body, and the support part shares and supports the weight of the muffler body and the load in the gravity direction, so the muffler body is attached to the support means more securely. In addition, since the support member can be manufactured by bending the metal plate, the support means can be obtained at low cost.
[0013]
In order to achieve the above object, the muffler mounting device for a construction machine according to the present invention is such that a muffler receiving portion that comes into surface contact with the outer peripheral surface of the muffler body is formed on the surface of the support portion that contacts the muffler body.
[0014]
With the above configuration, the muffler receiving part comes into surface contact with the outer peripheral surface of the muffler body, so that the fastening force and load can be dispersed and supported, and the rigidity of the support part is increased by the muffler receiving part, so the supporting means is configured. Accordingly, the thickness of the plate material to be reduced can be reduced, thereby reducing the weight and cost of the support member.
[0015]
In order to achieve the above object, a muffler mounting device for a construction machine according to the present invention is provided with an upper revolving body having a body frame on a self-propelled lower traveling body so that the upper revolving body can be swung freely, and a work is performed at the front center of the body frame. A muffler mounting device for a construction machine consisting of a hydraulic excavator having a machine, a driver's cab on the left side of the front, and an engine compartment containing a power engine in the rear, in the exhaust gas discharged from the engine It has a muffler body that silences noise, a support part and a mounting part that support the partition part provided in the muffler body from below and at least two sides, and the mounting part is mounted almost vertically on the engine A plurality of support means and a plurality of screw parts that are fitted to the outer peripheral surface of the muffler body from the side and that are provided with screw parts provided at the tip part in the attachment part. Those constructed from a fastening means comprising a U-bolt and screwed to the nut threads.
[0016]
With the above configuration, when the muffler main body is tightened by the fastening means, the tightening force is supported by the support means for supporting the portion where the strength is increased by the partition provided in the muffler main body. Even if fastened, the muffler body does not deform, and the muffler body can be firmly fixed to the support means, so even if vibration or inertia is applied to the muffler body during running or work, the muffler body There is no rattling or incomplete installation.
Also, since the fastening means can be tightened or loosened on the side of the fastening means, the muffler can be attached or removed without being obstructed by the exhaust pipe or muffler cover installed around the engine. Compared to the above, the workability is further improved, and the mounting portion of the support means becomes a heat insulating wall to block the heat on the muffler body side from propagating to the engine side, thereby preventing the engine from overheating. .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the present invention is implemented in a hydraulic excavator will be described in detail with reference to the drawings.
1 is a side view of a hydraulic excavator, FIG. 2 is a perspective view of the vicinity of the engine compartment, FIG. 3 is a perspective view of an engine installed in the engine compartment, FIG. 4 is a side view of the engine, and FIG. is there.
The hydraulic excavator shown in FIG. 1 is composed of a self-propelled lower traveling body 1 and an upper revolving body 2 installed on the lower traveling body 1 so as to be able to swivel.
The lower traveling body 1 includes a track frame 3 including a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a. An idler 4 is provided at one end of each side frame 3b. Is supported so as to be movable back and forth, and a sprocket 6 is provided on the other end side, which is rotationally driven by a traveling motor 5 made of a hydraulic motor.
[0018]
An endless crawler belt 7 is provided between the idler 4 and the sprocket 6, and by driving the crawler belt 7 with the sprocket 6, the lower traveling body 1 can self-propel and the side frame A plurality of rolling wheels 8 are rotatably supported on the upper and lower portions of 3b.
The upper swing body 2 that is pivotably installed on the center frame 3 a of the track frame 3 is configured by a body frame 10 at the bottom, and a work machine 11 is mounted on the body frame 10.
[0019]
As shown in FIG. 1, the work machine 11 has a base end pivotally attached to the vehicle body frame 10, a boom 12 that can be raised and lowered by a boom cylinder 13, a base end side pivotally attached to the tip of the boom 12, and an arm cylinder 14. Is constituted by an arm 15 that can be rotated by a pivot, and a bucket 17 that is pivotally attached to the tip of the arm 15 and that can be pivoted by a bucket cylinder 16.
A cab 18 is installed at the front of the body frame 10 at the side of the work machine 11, and an engine room 19 covered with a bonnet cover 19a is installed at the rear of the body frame 10. A power engine 20 is accommodated in the engine chamber 19, and a counterweight 21 is attached to the rear end of the body frame 10.
[0020]
A cooling fan 23 and a fan shroud 24 provided so as to surround the cooling fan 23 are installed at the front of the engine 20 housed in the engine chamber 19. A centrifugal supercharger 25 that supercharges 20 is installed.
The centrifugal supercharger 25 is composed of a turbine 25a rotated by exhaust gas of the engine 20 and a blower 25b driven by the turbine 25a so that the engine 20 is supercharged by the air discharged from the blower 25b. The exhaust gas discharged from the turbine 25 a is discharged to the muffler body 27 through the exhaust pipe 26.
[0021]
The muffler body 27 is placed on a support means 30 installed above a hydraulic pressure generating means 28 comprising a hydraulic pump installed on the output side of the engine 20.
The support means 30 includes a mounting portion 30a attached to the output side end surface of the engine 20 substantially vertically by a fixing tool 36, and a support portion 30b formed by bending both sides of the mounting portion 30a substantially at right angles. It is formed by molding.
As shown in FIG. 4, the support portion 30 b formed by bending from the attachment portion 30 a has a substantially triangular shape with the attachment portion 30 a as a base, and is formed by an arc having substantially the same curvature as the outer peripheral surface of the muffler body 27. A muffler receiving portion 30c is formed on the upper edge portion by bending the upper edge portion outward, and the upper surface of the muffler receiving portion 30c is in close contact with the outer peripheral surface of the muffler main body 27, so that the direction of gravity of the muffler main body 27 is reduced. And the load when the muffler body 27 is fastened are supported.
[0022]
As shown in FIG. 3, the muffler body 27 includes a cylindrical body 27a made of metal, an end plate 27b that closes both end surfaces of the cylindrical body 27a, and a plurality of partition walls 27d that divide the cylindrical body 27a into a plurality of expansion chambers 27c. Thus, as shown in FIG. 5, the support member 30 is manufactured in advance so that the partition walls 27 d provided on both ends of the cylindrical body 27 a are positioned on the muffler receiving portion 30 c of the support member 30. An exhaust pipe 26 that introduces exhaust gas discharged from the centrifugal supercharger 25 into the muffler main body 27 is connected to one end side of the muffler main body 27 so as to penetrate therethrough, and the tip of the exhaust pipe 26 that penetrates the muffler main body 27. Is closed by a lid 26a, and a large number of exhaust holes (not shown) are opened in the exhaust pipe 26 in the muffler body 27.
An exhaust cylinder 31 is provided on the other end side of the muffler main body 27 so as to vertically penetrate the upper outer periphery. Exhaust gas silenced in the muffler main body 27 is discharged from the upper end of the exhaust cylinder 31 to the atmosphere. The lower end of the exhaust pipe 31 is closed by a lid body 31a.
[0023]
On the other hand, the muffler main body 27 supported by the support means 30 is formed by, for example, a pair of U-bolts fastened to the support means 30 by the fastening means 33, and the muffler main body from the side of the muffler main body 27. 3 is fitted to the outer peripheral portion of 27, and the end of each fastening means 33 is fitted into the attachment hole 30d formed in the attachment portion 30a of the support means 30 from the side.
The upper end side of the attachment portion 30a of the support means 30 is bent obliquely along the outer peripheral surface of the muffler main body 27 as shown in FIG. 4, and the muffler receiving portion 30c formed by bending the upper edge of the support portion 30b. Thus, it is in contact with the outer periphery of the muffler main body 27 almost half of its circumference, and the fastening force applied to the muffler main body 27 by the fastening means 33 is supported.
[0024]
The upper side of the fastening means 33 is shorter than the lower side, and after being inserted into the mounting hole 30d drilled in the upper end of the mounting portion 30a, a nut 34 is screwed into the screw portion 33a. The side is inserted into a mounting hole 30d drilled in substantially the middle of the mounting portion 30a, and then a nut 33b is double screwed to the screw portion 33a.
[0025]
Next, the operation of the muffler mounting device constructed as described above will be described.
In attaching the muffler body 27 to the engine 20 installed in the engine chamber 19, the lower portion of the attachment portion 30 a of the support means 30 is fixed to the output side end surface of the engine 20 in advance by the fixing tool 36. Next, when the muffler main body 27 is placed on the muffler receiving portion 30c of the support means 30, the fastening means 33 is fitted from the side to the outer peripheral portion of the muffler main body 27, and the tip of the fastening means 33 is drilled in the attachment portion 30a. The nut 33b is screwed into the screw portion 33a and the muffler body 27 is temporarily fixed.
[0026]
In this state, when the exhaust pipe 26 drilled from the outer peripheral surface of the muffler body 27 is connected to the turbine 25a side of the centrifugal supercharger 25, the nut 33b is tightened by using a tool 34 as shown in FIG. The fastening means 33 is finally tightened.
As a result, the substantially half circumference of the muffler main body 27 is pressed against the mounting portion 30a of the support means 30 and the muffler receiving portion 30c, and the fastening means 33 supports the fastening force applied to the muffler main body 27. The muffler main body 27 can be firmly fixed, and the partition 27d portion provided in the muffler main body 27 is supported by the support portion 30b of the support means 30. Therefore, the muffler main body 27 is under its own weight and the construction machine is running. Alternatively, it is possible to prevent the muffler main body 27 from being deformed by vibration or inertia applied to the muffler main body 27 during the operation.
Further, since the nut 33b of the fastening means 33 can be tightened or loosened from the side of the attachment portion 30a of the support means 30 attached to the engine 20 almost vertically, the exhaust pipe 26 installed around the engine 20 or The muffler body 27 can be attached and detached without being obstructed by the muffler cover 35, which further improves the workability.
[0027]
In the above embodiment, the support means 30 is directly attached to the engine 20. However, the support means 30 is installed in the vicinity of the engine 20, and the muffler body 27 is attached to the support means 30 by the fastening means 33. In addition, U bolts are used for the fastening means 33. However, as long as the muffler body 27 can be fastened, it is of course possible to use fastening means 33 other than the U bolts, such as a band or a wire.
Moreover, although the example implemented to the hydraulic excavator was demonstrated, it is applicable to the construction machine with which the muffler which muffles the exhaust sound of the engine 20 is mounted.
[0028]
【The invention's effect】
As described in detail above, the present invention provides a supporting means for supporting a partition wall portion provided in a muffler body that silences noise in exhaust gas exhausted from an engine from at least two sides on the lower side and the side. The fastening means for fastening the muffler body to the mounting portion of the support means for supporting the muffler body from the side, so that when the muffler body is tightened by the fastening means, the strength is increased by the partition provided in the muffler body. Since the tightening force is supported by the support means for supporting the raised portion, the muffler body will not be deformed even if the muffler body is strongly fastened by the fastening means, thereby firmly fixing the muffler body to the support means. be able to. Therefore, even if vibration or inertia is applied to the muffler body during traveling or work, the muffler body can be stably supported by the support means.
[0029]
Also, since the fastening means can be tightened or loosened on the side of the fastening means, the muffler can be attached or removed without being obstructed by the exhaust pipe or muffler cover installed around the engine. Compared to the above, the workability is further improved, and the support means is composed of an attachment portion and a support portion that supports the muffler body from below, and the attachment portion is fixed to the engine, and the muffler body is attached to the attachment portion and the support portion. Since the muffler body is fastened to the support means so that the outer peripheral surface of the muffler comes into contact, the mounting part shares the fastening force when fastening the muffler body, and the support part shares the weight of the muffler body and the load in the gravity direction. By supporting the muffler body to the support means more securely and by bending the metal plate It is possible to fabricate the support member, the support means will be obtained at low cost.
[0030]
Furthermore, since the muffler receiving part that contacts the outer peripheral surface of the muffler body is formed on the surface of the support part that contacts the muffler main body, the muffler receiving part makes surface contact with the outer peripheral surface of the muffler main body. In addition to being able to support in a distributed manner, the rigidity of the support part is increased by the muffler receiving part, so that the thickness of the plate material constituting the support means can be reduced, thereby reducing the weight of the support means and reducing the cost. Become.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator that employs a muffler mounting device for a construction machine according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an upper swing body of a hydraulic excavator adopting a muffler mounting device for a construction machine according to an embodiment of the present invention.
FIG. 3 is a perspective view of a muffler body attached to an engine by a muffler attachment device for a construction machine according to an embodiment of the present invention.
FIG. 4 is a side view of a muffler body attached to an engine by a muffler attachment device for a construction machine according to an embodiment of the present invention.
FIG. 5 is a front view showing a muffler attachment device for a construction machine according to an embodiment of the present invention.
FIG. 6 is a side view showing a muffler mounting device for a conventional construction machine.
FIG. 7 is a front view showing a muffler mounting device for a conventional construction machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 10 Car body frame 11 Working machine 18 Operator room 19 Engine room 20 Engine 27 Muffler main body 27d Partition 30 Support means 30a Mounting part 30b Support part 33 Fastening means 33a Screw part 33b Nut

Claims (4)

  A muffler mounting device for a construction machine that mounts a muffler body that silences noise in exhaust gas discharged from the engine, and supports a partition wall portion provided in the muffler body from at least two sides below and on the side A muffler attachment device for a construction machine, comprising: a supporting means for fastening; and a fastening means for fastening the muffler body to an attachment portion of the support means for supporting the muffler body from a side.   The support means includes the attachment portion and a support portion that supports the muffler body from below, and the attachment portion is fixed to the engine, and the outer peripheral surface of the muffler body is attached to the attachment portion and the support portion. The muffler attachment device for a construction machine according to claim 1, wherein the muffler main body is fastened to the support means so as to come into contact. The muffler attachment device for a construction machine according to claim 2 , wherein a muffler receiving portion that is in surface contact with the outer peripheral surface of the muffler main body is formed on a surface of the support portion that contacts the muffler main body.   On the self-propelled lower traveling body, an upper turning body having a vehicle body frame is provided so as to be rotatable, and a work machine is provided at the front center of the vehicle body frame, a cab is provided on the left side of the front, and power is provided at the rear. A muffler mounting device for a construction machine comprising a hydraulic excavator in which an engine room containing an engine is installed, and a muffler body that silences noise in exhaust gas discharged from the engine, and provided in the muffler body A supporting means for supporting the partition wall part from at least two sides on the lower side and at the side, and a supporting means attached to the engine substantially vertically; and an outer peripheral surface of the muffler main body. A plurality of U-bolts that are fitted from the side and that are provided at the distal end portion are inserted into attachment holes drilled in the attachment portion, and nuts that are screwed into the screw portions. It was equipped with a fastening means comprising a muffler mounting device for a construction machine characterized.

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