JP5823912B2 - Crane upper turning body - Google Patents

Description

  The present invention relates to an upper swing body of a crane.

  FIG. 1 of Patent Document 1 describes an upper swing body in which an engine is disposed behind the cab.

JP 2007-217150 A

  The upper swing body described in Patent Document 1 (FIG. 1) includes a sound absorbing material provided on the inner surface of the air intake chamber behind the cab to reduce noise. However, in this upper rotating body, noise countermeasures are not taken on the exhaust side, so noise emitted from the exhaust side opening to the external space becomes a problem.

  In addition, in this type of upper revolving structure, there is a problem that a large amount of noise is released to the external space from between members of the machine, such as a gap of a guard (exterior panel).

  An object of the present invention is to provide an upper swing body of a crane that can suppress noise emitted from an exhaust opening of cooling air.

  An upper swing body of a crane according to the present invention includes a boom disposed at a central portion in the width direction of the upper swing body, a cab disposed at one width direction of the upper swing body, a side of the boom and the cab. An engine disposed behind the first duct, a first duct in which the engine is disposed, and a guard constituting a part of the first duct. The first duct is disposed in front of the engine and communicates between the outside of the guard and the inside of the first duct, and cooling air passing through the rear of the boom from the inside of the first duct. A first exhaust opening provided to be discharged out of the guard.

  With the above configuration, noise emitted from the exhaust opening of the cooling air can be suppressed.

It is a perspective view of an upper revolving structure. It is the figure which looked at the upper revolving structure shown in FIG. 1 from the top. It is the figure which looked at the winch 50 periphery shown in FIG. 2 from the top. It is the schematic of the expansion type silencer around the winch 50 shown in FIG. It is the figure which looked at the winch 50 periphery shown in FIG. 2 from back. FIG. 6 is a cross-sectional view taken along arrow VI in FIGS. 3 and 5. (A) It is the VIIa cutting part end view of FIG.3 and FIG.5. (B) It is a VIIb arrow directional cross-sectional view of FIG.3 and FIG.5. (C) It is a VIIc arrow directional cross-sectional view of FIG.3 and FIG.5. (A) It is VIIIa arrow sectional drawing of FIG.3 and FIG.5. (B) It is VIIIb arrow sectional drawing of FIG.3 and FIG.5. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment. It is the figure which looked at the upper turning body shown in FIG. 9 from the side. (A) It is the figure which looked at the duct 180 periphery shown in FIG. 10 from the top. (B) It is the schematic of the duct 180 shown to Fig.11 (a). It is the figure which looked at the duct 180 periphery shown in FIG. 10 from the side. It is a perspective view of the duct 180 shown in FIG. (A) It is the figure which looked at a part of upper revolving structure of a 3rd embodiment from the top. (B) It is a figure equivalent to FIG. 10 of 3rd Embodiment. It is a graph which shows the ambient noise of the upper revolving structure shown in FIG. It is a graph which shows the ear noise in the cab shown in FIG. It is a graph which shows the machine side noise of the upper revolving structure shown in FIG.

(First embodiment)
The upper swing body 1 of the first embodiment will be described with reference to FIGS. 2 and 3, the inner side (lower side) of the top surface 10u of the guard 10 in FIG. 1 is illustrated. Further, FIG. 5 illustrates the inner side (front side) of the rear surface of the winch peripheral guard 13 of FIG. Moreover, FIGS. 1-8 is a figure which shows the outline of a structure and arrangement | positioning.

  The upper swing body 1 is a component of a crane. This crane is, for example, mobile and is, for example, a wheel crane. The upper swing body 1 is mounted so as to be swingable above a lower body (not shown). The lower body is, for example, a wheel-type lower traveling body. Here, as shown in FIG. 1, the width direction of the upper swing body 1 is defined as a “width direction X”. The upper swing body 1 includes a guard 10 that is an exterior of the upper swing body 1, and a boom 21 and a boom support member 25 that are respectively disposed in the central portion 1 a in the width direction X. As shown in FIG. 2, the upper-part turning body 1 includes a cab 31, a radiator 33, a cooling fan 35, an engine 37, a power divider 38, and a hydraulic pump 39, which are respectively arranged in one part 1 b in the width direction X. And comprising. The upper swing body 1 includes a hydraulic oil tank 41 disposed in the other portion 1c in the width direction X, a winch 50 and a winch support portion 60 (see FIG. 3) respectively disposed behind the boom 21, and the guard 10. Provided duct 70 (first duct). Here, in the width direction X, the engine 37 side with respect to the boom 21 is set as one side X1, and the side opposite to the engine 37 with respect to the boom 21 is set as the other side X2.

  As shown in FIG. 1, the guard 10 is an exterior panel of the upper swing body 1. The guard 10 covers devices that constitute the power unit of the upper swing body 1. The guard 10 includes an engine guard 11 on one part 1b (part on one side X1) of the upper swing body 1, a hydraulic oil tank side guard 12 on the other part 1c (part on the other side X2) of the upper swing body 1, A winch peripheral guard 13 disposed behind the boom 21 of the central portion 1a of the upper swing body 1.

  The boom 21 is a rod-like structure for hanging a suspended load or the like (not shown) via the wire cable 23. The boom 21 is, for example, a box-type telescopic boom. The boom 21 is disposed at the central portion 1 a in the width direction X of the upper swing body 1. The boom 21 is attached to the boom support member 25 so as to be raised and lowered. A base end portion (rear end portion) of the boom 21 is rotatably attached to the boom support member 25. The boom 21 in the face-down state is arranged so as to cut the guard 10 longitudinally. Hereinafter, it is assumed that the boom 21 is in a face down state unless otherwise specified.

  The boom support member 25 is a frame that supports the boom 21. The boom support member 25 includes two plate-like members arranged along the front-rear direction so as to sandwich the boom 21 from the left and right. As shown in FIG. 6, the rear end portion of the boom support member 25 is inclined, for example, and the upper end is disposed rearward of the lower end, for example.

  The cab 31 is a cab of a crane as shown in FIG. The cab 31 is disposed on one portion 1 b of the upper swing body 1.

  The radiator 33 is a heat exchanger that cools cooling water or the like of the engine 37. The radiator 33 is disposed inside the engine guard 11 (engine room). Note that the cooling fan 35, the engine 37, and the hydraulic pump 39 are the same in that they are arranged inside the engine guard 11.

  The cooling fan 35 is a fan for flowing cooling air into the engine guard 11 or the like. The cooling fan 35 is disposed, for example, behind the radiator 33. The cooling fan 35 is driven by the engine 37. The cooling fan 35 is a suction fan that mainly flows cooling air mainly in the fan circumferential direction.

  The engine 37 is a drive source for the hydraulic pump 39 and the like. The engine 37 is arranged in one portion 1b in the width direction X of the upper swing body 1. The engine 37 is disposed on the side of the boom 21. The “side of the boom 21” is the side (horizontal, right, or left) of the boom 21 when the upper swing body 1 is viewed from above. The position of the engine 37 is directly beside the boom 21 in the face-down state, but does not have to be beside the boom 21 in the raised state. The engine 37 is disposed behind the cab 31. The engine 37 and the hydraulic pump 39 are noise sources.

  The hydraulic pump 39 supplies hydraulic oil to a hydraulic actuator that operates the crane. The hydraulic actuator is, for example, a hydraulic motor 55 that drives the winch drum 51 shown in FIG. As shown in FIG. 2, the hydraulic pump 39 is attached to the engine 37 via a power divider 38 so as to protrude rearward from the engine 37.

  The hydraulic oil tank 41 is a container that stores hydraulic oil for operating the hydraulic actuator. The hydraulic oil tank 41 is disposed in the other portion 1 c in the width direction X of the upper swing body 1.

  The winch 50 is a device that winds and unwinds the wire cable 23 (see FIG. 1). The winch 50 is disposed behind the boom 21. The winch 50 is disposed at the rear end of the upper swing body 1. The winch 50 is disposed in the duct 70 (described later). As shown in FIG. 3, the winch 50 includes a winch drum 51 around which the wire cable 23 is wound, and a hydraulic motor 55 that is attached to the winch drum 51 and rotates the winch drum 51. As shown in FIG. 6, the shaft portion of the winch drum 51 is a winch shaft 53.

  As shown in FIG. 3, the winch support portion 60 is a portion that supports the winch 50. The winch support portion 60 includes, for example, a winch support frame 61, a support material 63, and a winch shaft support material 65. The configuration for supporting the winch 50 may be changed.

  The winch support frame 61 (61R / 61L) is a frame-like member disposed on the left and right sides of the winch drum 51 (both sides in the width direction X). The winch support frame 61 is disposed behind the boom support member 25. As shown in FIGS. 3 and 5, the winch support frames 61 </ b> R and 61 </ b> L are arranged along a direction (front-rear and up-down directions) orthogonal to the width direction X. As shown in FIG. 6, the front end of the winch support frame 61 is formed, for example, along the rear end of the boom support member 25. The lower end, the rear end, and the upper end of the winch support frame 61 are in contact with the inner surfaces of the bottom surface, the rear surface, and the top surface 13u of the winch peripheral guard 13, for example. In FIG. 3, the bottom surface of the winch peripheral guard 13 shown in FIG. 6 is omitted. In FIG. 5, the boom support member 25 shown in FIG. 6 and the boom 21 shown in FIG. 2 are omitted.

  As shown in FIG. 5, the winch support frame 61 includes holes 61 a (61 Ra and 61 La) formed on the left and right sides of the winch drum 51. The inner periphery of the hole 61a may not be constituted only by the winch support frame 61. Specifically, for example, as shown in FIG. 8B, a portion surrounded by the winch support frame 61L and the inner surface of the winch peripheral guard 13 may be a hole 61La. The winch support frame 61 may include a hole 61b through which a pipe passes, for example, at the lower end. In FIG. 7C and FIG. 8A, the winch support frame 61L is omitted.

  As shown in FIG. 5, the support members 63 (63 u and 63 b) are, for example, rod-shaped members that are disposed above and below the winch drum 51. The two support members 63u and 63b respectively connect the left and right winch support frames 61R and 61L. The support material 63 is disposed such that the longitudinal direction is along the width direction X.

  The winch shaft support members 65 (65R and 65L) are, for example, plate-like members that are disposed on the left and right sides of the winch drum 51 and support the winch shaft 53 (see FIG. 6). The two winch shaft support members 65R and 65L respectively connect the upper and lower support members 63u and 63b. The winch shaft support member 65 is disposed so that the longitudinal direction thereof is along the vertical direction. The winch shaft support member 65R on the one side X1 is disposed, for example, on the other side X2 of the winch support frame 61R, and supports the winch shaft 53 (see FIG. 6). The winch support frame 61L on the other side X2 is disposed, for example, on the other side X2 of the winch support frame 61L, and supports the winch shaft 53 (see FIG. 6) via the hydraulic motor 55. In FIGS. 8A and 8B, the winch shaft support member 65L is omitted.

  As shown in FIG. 2 (refer to the thick line in FIG. 2), the duct 70 (first duct) is a conduit through which cooling air for cooling the engine 37 and the like passes. The structure of the duct 70 is a structure (duct structure) in which cooling air does not leak from other than a predetermined opening (exhaust opening 73 described later). The duct 70 is formed in a substantially L shape when viewed from above. Inside the duct 70, a radiator 33, a cooling fan 35, an engine 37, a hydraulic pump 39, and a winch 50 are disposed. The duct 70 is constituted by an inner surface of the guard 10 or a duct constituent member (such as a plate 70a shown in FIG. 6) different from the guard 10. As shown in FIG. 6, the duct 70 at the periphery of the winch 50 includes, for example, a rear surface, a bottom surface, a top surface 13 u of the winch periphery guard 13, and a plate 70 a. The plate 70a is, for example, a member that connects the front end portions of the left and right winch support frames 61R and 61L (see FIG. 3). As shown in FIG. 2, the duct 70 includes an intake opening 71 (first intake opening) that is an inlet for cooling air and an exhaust opening 73 (first exhaust opening) that is the outlet.

  The intake opening 71 (first intake opening) is disposed in front of the engine 37. More specifically, the intake opening 71 is disposed in front of the radiator 33 and in the rear (back) of the cab 31. The intake opening 71 communicates the outside of the engine guard 11 and the inside of the duct 70. As shown in FIG. 1, the intake opening 71 is formed, for example, on the side surface of the engine guard 11 and the top surface 11u.

  As shown in FIG. 2, the exhaust opening 73 (first exhaust opening) is provided so that the cooling air passing behind the boom 21 is discharged from the inside of the duct 70 to the outside of the guard 10. The “cooling air passing through the rear of the boom 21” includes the cooling air in the middle of passing through the rear of the boom 21 and the cooling air after passing through the rear of the boom 21. “Backward of the boom 21” is specifically the position behind the boom support member 25 and the inside of the winch peripheral guard 13 of the central portion 1 a in the width direction X of the upper swing body 1. The exhaust opening 73 includes an exhaust opening 73a disposed in the central portion 1a in the width direction X of the upper swing body 1 and an exhaust opening 73b disposed in the other portion 1c in the width direction X.

  The exhaust opening 73a is an opening through which the cooling air is exhausted, and is an opening through which the wire cable 23 (see FIG. 8A) wound around the winch 50 is passed. The exhaust opening 73 a is disposed above the winch 50. The exhaust opening 73a is disposed behind the boom 21 and at the rear end of the upper swing body 1. The exhaust opening 73a is formed in the top surface 13u (see FIG. 1) of the winch peripheral guard 13. When viewed from above, the exhaust opening 73a is disposed behind the central axis of the winch drum 51 (the central axis of the winch shaft 53 in FIG. 6). As shown in FIG. 7C, the exhaust opening 73a is disposed, for example, behind the support member 63u.

  The exhaust opening 73b is formed in the hydraulic oil tank side guard 12 as shown in FIG. The exhaust opening 73b is disposed on the side opposite to the engine 37 (the other side X2, the other portion 1c) with respect to the boom 21 in the width direction X of the upper swing body 1. The exhaust opening 73 b is disposed at the rear end of the upper swing body 1. As shown in FIG. 1, the exhaust opening 73b is formed in the top surface 12u.

  As shown in FIG. 3, the diaphragm 75 has a configuration for providing an expansion silencer in the duct 70. A diaphragm 75 is provided so that an expansion silencer is configured between the two diaphragms 75. The throttle 75 is provided on the upstream side (one side X1) and the downstream side (the other side X2) of the winch 50, respectively. Specifically, the diaphragm 75 includes, for example, holes 61Ra and 61La formed in the two winch support frames 61R and 61L, respectively. The operation of the expansion silencer will be described with reference to FIG. When the cooling air passes through the hole 61Ra (upstream restriction 75), the cross-sectional area of the cooling air flow passage increases, and the cooling air expands. The cooling air that has passed through the hole 61Ra flows outside the outer periphery of the winch 50 and the wire cable 23 along the width direction X. When the cooling air passes through the hole 61La (downstream restrictor 75), the cross-sectional area of the cooling air flow path is reduced, and the cooling air is compressed. The acoustic energy of noise is reduced by the expansion and compression of the cooling air.

(Effect 1)
Next, the effect of the upper swing body 1 shown in FIG. 1 will be described. The upper swing body 1 is disposed at the boom 21 disposed in the central portion 1 a in the width direction X, the cab 31 disposed in the one portion 1 b in the width direction X, and on the side of the boom 21 and behind the cab 31. The engine 37, the duct 70 in which the engine 37 is disposed, and the guard 10 constituting a part of the duct 70 are provided.

The duct 70 includes an intake opening 71 and an exhaust opening 73. The intake opening 71 is disposed in front of the engine 37 and communicates between the outside of the guard 10 and the inside of the duct 70. The exhaust opening 73 is provided so that cooling air passing behind the boom 21 is discharged from the inside of the duct 70 to the outside of the guard 10.
In this configuration, the cooling air flow path is bent. More specifically, the cooling air passes around the engine 37 disposed on the side of the boom 21, bends toward the rear of the boom 21, passes through the rear of the boom 21, and is exhausted from the exhaust opening 73 to the outside of the guard 10. The Therefore, noise (direct sound) directly emitted from the noise source such as the engine 37 to the outside of the guard 10 through the exhaust opening 73 can be suppressed.
Moreover, in the said structure, the flow path of cooling air can be lengthened. More specifically, as compared with the case where the cooling air does not pass behind the boom 21 (for example, the case where the exhaust opening 73 is disposed only in the one part 1b of the upper swing body 1), the exhaust opening from the noise source such as the engine 37 or the like. The flow path of the cooling air to the part 73 can be lengthened. Therefore, noise emitted from the exhaust opening 73 can be suppressed.

The upper swing body 1 includes the duct 70 described above.
In this configuration, noise hardly leaks from the gap of the guard 10 or the like, so that noise radiated from the upper swing body 1 can be suppressed.

(Effect 2)
As shown in FIG. 2, the upper swing body 1 includes a winch 50 disposed behind the boom 21 and in the duct 70. As shown in FIG. 8A, the exhaust opening 73 a is disposed above the winch 50.
In this configuration, the hole through which the wire cable 23 wound around the winch 50 passes can be used as the exhaust opening 73a for exhausting the cooling air.

(Effect 3)
As shown in FIG. 2, the exhaust opening 73 b is disposed on the side opposite to the engine 37 (the other portion 1 c) with respect to the boom 21 in the width direction X of the upper swing body 1.
In this configuration, the flow path of the cooling air exhausted from the noise source such as the engine 37 to the outside of the guard 10 through the exhaust opening 73b can be made longer. Therefore, noise emitted from the exhaust opening 73b can be further suppressed.

(Effect 5)
The upper swing body 1 includes a winch 50 disposed behind the boom 21 and in the duct 70, and a throttle 75 provided on each of the upstream side and the downstream side of the winch 50 as shown in FIG. The two diaphragms 75 are provided so that an expansion silencer is configured between the two diaphragms 75.
With this expansion silencer, acoustic energy is reduced. Therefore, noise emitted from the exhaust opening 73 shown in FIG. 1 can be further suppressed.

(Effect 6)
The exhaust opening 73 is formed in the top surface 10 u of the guard 10.
Therefore, it is possible to suppress high-temperature exhaust from the exhaust opening 73 from hitting a person in the vicinity of the exhaust opening 73.

(Second Embodiment)
With reference to FIGS. 9 to 11, a difference between the upper-part turning body 101 of the second embodiment and the first embodiment will be described. An upper swing body 101 shown in FIG. 9 is obtained by adding a duct 180 (second duct) to the upper swing body 1 shown in FIG. Further, the upper swing body 101 shown in FIG. 9 includes a partition plate 138 provided between the engine 37 and the hydraulic pump 39. 10 is a view of the inner side (the other side X2) from the side surface 11s1 on the one side X1 of the engine guard 11 shown in FIG. FIG. 11A is a view of the periphery of the duct 180 as viewed from above, and the portions other than the duct 180 are shown inside the top surface 11u of the engine guard 11. FIG. 9 to 11 are diagrams showing an outline of the configuration and arrangement.

  As shown in FIG. 9, the partition plate 138 divides the engine 37 and the hydraulic pump 39 in order to prevent the hydraulic oil 39 from splashing on the engine 37 side and causing a fire when the hydraulic pump 39 is broken. It is. The partition plate 138 is disposed in the engine guard 11. As shown in FIG. 10, the partition plate 138 is disposed between the vicinity of the attachment portion of the hydraulic pump 39 to the engine 37 and the inner surface of the top surface 11 u of the engine guard 11. The partition plate 138 is provided so as to cover substantially the upper half of the engine 37 when viewed from the front-rear direction.

  The duct 180 (second duct) is a conduit through which the cooling air above the engine 37 passes. The duct 180 is a conduit through which cooling air around the partition plate 138 passes. The duct 180 branches off from the duct 70. That is, the inlet (the intake opening 181 described later) of the duct 180 is disposed inside the duct 70. The sectional area of the duct 180 is sufficiently smaller than the sectional area of the duct 70. The vertical width of the duct 180 is, for example, about the same as the vertical width (interval) between the upper end of the engine 37 and the inner surface of the top surface 11 u of the engine guard 11. As shown in FIG. 9, the lateral width of the inlet (intake opening 181) of the duct 180 is, for example, half or less of the lateral width of the duct 70 in the engine guard 11. The duct 180 has the side surface 11s1, the rear surface 11r, and the top surface 11u (see FIG. 10) on one side X1 of the engine guard 11 as inner surfaces. The duct 180 is substantially L-shaped when viewed from above. As shown in FIG. 11A, the duct 180 includes an intake opening 181 (second intake opening) that is an inlet for cooling air and an exhaust opening 183 (second exhaust opening) that is an outlet for cooling air. And a bent portion 185 formed between the intake opening 181 and the exhaust opening 183, and an inclined portion 187 formed in the vicinity of the intake opening 181 shown in FIG.

  The intake opening 181 (second intake opening) communicates the inside of the duct 70 and the inside of the duct 180. The intake opening 181 is disposed at a position where the cooling air flowing (flowing or after flowing) above the engine 37 can be sucked. The intake opening 181 is disposed above the engine 37. The intake opening 181 is at least partially disposed above the upper end of the engine 37. The “above the engine 37” includes not only directly above the engine 37 but also the vicinity directly above the engine 37. Specifically, the intake opening 181 shown in FIG. 10 is rearward of the front end of the engine 37, for example, rearward of the center portion in the front-rear direction of the engine 37, for example, near the rear end of the engine 37, for example, the engine 37. It is arranged behind the rear end. The intake opening 181 is disposed in front of the central portion in the longitudinal direction (front-rear direction) of the hydraulic pump 39, for example, in the vicinity of the front end of the hydraulic pump 39, for example, in front of the front end of the hydraulic pump.

  As shown in FIG. 13, the intake opening 181 is specifically a hole formed in the partition plate 138, for example. The intake opening 181 is disposed, for example, above the attachment portion of the hydraulic pump 39 to the engine 37. The intake opening 181 (duct 180) may be separate from the partition plate 138. Note that the cooling air tends to stay above the engine 37 shown in FIG. 10 because the flow is hindered by the partition plate 138 and machinery (not shown) such as an air filter. On the other hand, below the engine 37, the cooling air is likely to stay between the supports S that support the engine 37, so that it is difficult to stay.

  As shown in FIG. 9, the exhaust opening 183 (second exhaust opening) communicates the inside of the duct 180 and the outside of the guard 10. The exhaust opening 183 is disposed upstream of the duct 70 with respect to the exhaust opening 73 of the duct 70. The exhaust opening 183 is disposed on one side X1 (engine 37 side) from the exhaust opening 73. The exhaust opening 183 is disposed at one portion 1 b in the width direction X of the upper swing body 101. The exhaust opening 183 includes, for example, an exhaust opening 183 a disposed at the rear end of the engine guard 11 and an exhaust opening 183 b disposed above the winch 50.

  The exhaust opening 183a is formed (arranged) at the upper end of the rear surface 11r of the engine guard 11, as shown in FIG. Since the exhaust opening 183a is disposed at the upper end of the engine guard 11, it is possible to suppress high-temperature exhaust from hitting a person or the like. The exhaust opening 183 may be disposed on the top surface 11u of the engine guard 11.

  As shown in FIG. 11A, the exhaust opening 183 b is provided so as to exhaust the cooling air behind the boom 21 (see FIG. 9) and out of the guard 10. The exhaust opening 183b is formed in the side surface 11s2 on the boom 21 side (see FIG. 9, the other side X2) of the rear end portion of the engine guard 11. As shown in FIG. 9, the width of the exhaust opening 183b in the front-rear direction is, for example, about the same as the width of the exhaust opening 73a in the front-rear direction.

  The bent portion 185 is formed between the intake opening 181 and the exhaust opening 183 as shown in FIG. The flow path of the cooling air is bent at the bent portion 185. The bent portion 185 is disposed, for example, in the vicinity of the joint portion between the rear surface 11r and the side surface 11s1 of the engine guard 11.

  The inclined portion 187 is disposed in the vicinity of the intake opening 181 as shown in FIG. The flow path of the cooling air is bent at the inclined portion 187. The inclined portion 187 is formed so that the cross section of the flow path of the duct 180 becomes narrower toward the downstream side from the intake opening 181. The inclined portion 187 is disposed on the bottom surface of the duct 180, for example.

(Effect 4)
Next, the effect of the upper swing body 101 shown in FIG. 10 will be described. The upper swing body 101 includes a duct 180 branched from the duct 70. The duct 180 includes an intake opening 181 disposed above the engine 37 and an exhaust opening 183.

The intake opening 181 is disposed above the engine 37.
Therefore, it is possible to suppress the cooling air from staying above the engine 37.

As shown in FIG. 9, the exhaust opening 183 is arranged upstream of the exhaust opening 73 (first exhaust opening) in the duct 70 (first duct) and between the inside of the duct 180 and the outside of the guard 10. Communicate.
In this configuration, the duct 180 has a shorter cooling air flow path than the duct 70. Therefore, the resistance received by the cooling air flowing in the duct 180 is less than that of the duct 70. Therefore, compared with the case where the upper swing body 101 includes only the duct 70, the cooling air is easily discharged from the inside of the guard 10, and the air volume of the cooling air can be improved. As a result, both the effect of reducing noise by the duct 70 and the effect of efficiently exhausting the cooling air by the duct 180 can be achieved.

(Third embodiment)
With reference to FIG. 14 (a) and (b), difference with 2nd Embodiment is demonstrated about the upper turning body 201 of 3rd Embodiment. The upper swing body 201 includes a sound absorbing material 291 provided on the inner surfaces of the duct 70 and the duct 180.

  The sound absorbing material 291 reduces acoustic energy in the duct 70 and the duct 180. The sound absorbing material 291 is installed on, for example, substantially the entire surface of at least one of the inner surfaces of the duct 70 and the duct 180. The sound absorbing material 291 is disposed in the engine guard 11, for example. The sound absorbing material 291 may be disposed in the winch peripheral guard 13 or the hydraulic oil tank side guard 12 shown in FIG. As shown in FIG. 14A, the sound absorbing material 291 is disposed on substantially the entire inner surface of each of the side surface and the rear surface of the duct 70, for example. As shown in FIG. 14B, the sound absorbing material 291 is disposed on substantially the entire inner surface of each of the upper and lower surfaces and the rear surface (portions other than the exhaust opening 183) of the duct 180, for example. The sound absorbing material 291 is sheet-like glass wool, soft urethane foam, metallic granular material, or a metal porous plate material provided with a back air layer. The metal is, for example, iron or aluminum.

(Noise comparison)
Noise was compared between the upper swing body 201 shown in FIGS. 14A and 14B and the upper swing body of the comparative example. The upper rotating body of the comparative example is the same as that described in Patent Document 1. Specifically, in the upper-part turning body of the comparative example, the cooling air sucked from the intake opening 71 is exhausted from the exhaust opening provided in the engine guard (11). Moreover, the upper revolving structure of the comparative example has a structure in which cooling air leaks from the gap of the guard (10) (no duct structure).

  FIG. 15 shows the measurement results of ambient noise. FIG. 15 is a graph showing the relationship between frequency (horizontal axis) and sound power level (vertical axis). The measurement method of ambient noise is based on JIS A 8305. In the upper swing body 201, the overall value of the sound power level was reduced by 3 dB compared to the comparative example (the sound energy was reduced to about half). The overall value is shown at the right end of the horizontal axis of the graph (the same applies to FIGS. 16 and 17).

  FIG. 16 shows the measurement results of the ear noise in the cab 31 (see FIG. 14A). FIG. 16 is a graph showing the relationship between frequency (horizontal axis) and A-weighted sound pressure level (vertical axis). In the upper swing body 201, the overall value of the A-weighted sound pressure level was reduced by about 4 dB compared to the comparative example (sound energy was reduced to about 40%).

  FIG. 17 shows the measurement result of the machine side noise measured at a position 1 m away from the engine guard 11 (see FIG. 14A). FIG. 17 is a graph showing the relationship between frequency (horizontal axis) and A-weighted sound pressure level (vertical axis). In the upper swing body 201, the overall value of the A-weighted sound pressure level was reduced by about 5 dB compared to the comparative example (sound energy was reduced to about 30%).

(Modification)
The above embodiment can be variously modified. For example, the sound absorbing material 291 shown in FIG. 14A may be provided on the upper swing body 1 (see FIG. 2) that does not include the duct 180 shown in FIG.

1, 101, 201 Upper revolving body 10 Guard 10u Top surface 21 Boom 31 Cab 37 Engine 50 Winch 70 Duct (first duct)
71 Intake opening (first intake opening)
73 Exhaust opening (first exhaust opening)
75 Aperture 180 Duct (second duct)
181 Intake opening (second intake opening)
183 Exhaust opening (second exhaust opening)

Claims (6)

An upper swing body of a crane,
A boom disposed in a central portion in the width direction of the upper swing body;
A cab disposed on one side in the width direction of the upper swing body;
An engine disposed on the side of the boom and behind the cab;
A guard that is an exterior of the upper revolving structure,
A first duct in which the engine is disposed ;
A winch disposed behind the boom and in the first duct;
With
A part of the first duct is constituted by an inner surface of the guard,
The first duct is
A first intake opening which is arranged in front of the engine,
A first exhaust opening through which cooling air through the rear of the boom is provided as issued discharged,
An upper turning body of a crane comprising: Before the first exhaust opening SL is disposed above the winch,
The upper turning body of the crane according to claim 1. The first exhaust opening is disposed on the opposite side of the engine to the boom in the width direction of the upper swing body.
The upper turning body of the crane according to claim 1 or 2. A second duct branched from the first duct;
A part of the second duct is constituted by an inner surface of the guard,
The second duct is
A second intake opening disposed above the engine;
A second exhaust opening that is arranged upstream of the first duct than the first exhaust opening,
The upper turning body of the crane according to claim 1, comprising: With Rio diaphragm provided on each upstream and downstream of the previous SL winch,
The two diaphragms are provided such that an expansion silencer is configured between the two diaphragms.
The upper turning body of a crane given in any 1 paragraph of Claims 1-4. The first exhaust opening is formed on the top surface of the guard.
The upper revolving structure of the crane of any one of Claims 1-5.