JP6131129B2 - Rough terrain crane - Google Patents

Description

  The present invention relates to a rough terrain crane equipped with a selective catalytic reduction device (Selective Catalytic Reduction: hereinafter referred to as “SCR”), and more particularly to a layout of a urea tank as a component of the SCR.

  Diesel engine exhaust contains particulate matter (hereinafter referred to as “PM”), nitrogen oxides (hereinafter referred to as NOx), etc., and in order to prevent air pollution, 2. Description of the Related Art Exhaust gas purification devices that prevent substances from being released into the atmosphere have been developed. This exhaust purification device includes a diesel particulate filter device (Diesel Particulate Filter: hereinafter referred to as “DPF”) for collecting PM, and an oxidation catalyst device (Diesel Oxidation Catalyst: hereinafter) for removing NOx. (Hereinafter referred to as “DOC”), a reducing agent supply device (Decomposition Reactor Tube: hereinafter referred to as “DRT”), and a selective catalytic reduction device (Selective Catalytic Reduction: hereinafter referred to as “SCR”). The required exhaust purification device is configured by including them as elements and combining them.

  Diesel engines are installed in a variety of vehicles. Regardless of the type of vehicle, the need for exhaust gas purification has been increasing in recent years, and SCR has also been adopted for passenger cars, trucks, crawler construction machines, etc. . And since the urea water is used in the exhaust gas purification process by the SCR, a urea water tank for storing the urea water is mounted on the vehicle (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent No. 4851370 Japanese Patent No. 5054613

  By the way, a rough terrain crane is generally a crane vehicle that is equipped with a two-axis traveling device that can be driven by four wheels and steered by four wheels, and that can travel and operate a crane from a single driver's seat. Exhibits rough terrain travel. Rough terrain cranes are characterized by a compact design in order to exhibit such special performance (merits), and the overall length of the body is set short, and the engine is placed behind the body. In addition, all crane operations are controlled by hydraulic pressure.

  In order for the rough terrain crane to exhibit the above performance, when the exhaust emission control device is installed, an increase in the overall length and width of the body must be avoided, and the crane from the same driver's seat as when traveling can be used. Visibility and visibility during operation / running are also required. Specifically, for example, if the urea water tank, which is a component of the exhaust gas purification device, is simply placed in an empty space around the chassis, the urea water pipe becomes uselessly long or the urea water tank is connected to the urea water tank. Various problems may occur, such as the urea filling operation becoming difficult. Therefore, a special device is required for the layout of the urea water tank.

  The present invention has been made based on such a background, and exhibits excellent turning ability and rough terrain traveling performance with a compact body, while ensuring excellent visibility or good visibility in crane operation and traveling. It is to provide a rough terrain crane equipped with an SCR in which a urea water tank is laid out at an optimum position.

  (1) In order to achieve the above object, a rough terrain crane according to the present invention includes a lower traveling body having a front axle and a rear axle, a boom device disposed on the lower traveling body, a traveling and a hydraulic actuator. The lower traveling body includes a lower frame, a front outrigger and a rear outrigger disposed on the lower side of the front end and the lower side of the rear end of the lower frame, A reducing agent tank, a reducing agent supply device, and a reducing agent stored in the lower frame, having an engine that drives each of the axles and supplies hydraulic pressure to the hydraulic actuator; An exhaust purification device having a selective catalytic reduction device disposed downstream of the supply device is mounted. In this rough terrain crane, the reducing agent tank is disposed behind the rear axle and ahead of the rear outrigger, and at a position along the case of the lower frame and the rear outrigger.

  In the present invention, since the exhaust purification device is mounted, the exhaust of the rough terrain crane is purified, and it is possible to clear recent severe exhaust gas regulations. By arranging the reducing agent tank included in the exhaust emission control device at the above position, the reducing agent tank is attached in a compact manner without increasing the overall length and width of the lower traveling body. Moreover, since the reducing agent tank is disposed at a position facing the outside of the side surface of the vehicle body, the reducing agent injection operation is facilitated. Furthermore, the influence of radiant heat from the exhaust system can be suppressed.

  (2) It is preferable that the reducing agent tank is disposed between a mud guard provided in the vicinity of the rear axle and a case of the rear outrigger.

  In this configuration, there is an advantage that the reducing agent tank is protected from a so-called stepping stone from the rear wheel tire.

  (3) The reducing agent tank is preferably disposed below the reducing agent supply device.

  In this configuration, the reducing agent tank is disposed in the vicinity of the reducing agent supply device. Therefore, the piping for feeding the reducing agent is simple. Further, since the reducing agent supply device is generally arranged in the vicinity of the engine, the reducing agent tank is located in the vicinity of the engine cooling device (radiator). Therefore, for example, in the case of preventing freezing of the reducing agent in a cold district or thawing the frozen reducing agent, the cooling water in the radiator is used, but this cooling water is circulated to the reducing agent tank. There is also an advantage that the piping of the can be simplified.

  (4) The reducing agent tank is preferably disposed below the selective catalytic reduction device.

  In this configuration, the selective catalytic reduction device forms a soot with respect to the reducing agent tank. For this reason, the influence of the direct sunlight on a reducing agent tank is suppressed. That is, for example, even when urea water is used as the reducing agent, deterioration of the reducing agent in the tank can be suppressed. In addition, as a result of suppressing the influence of direct sunlight on the reducing agent tank, even if the reducing agent tank is formed of resin, deterioration of the reducing agent tank due to ultraviolet rays is prevented. In addition, since the reducing agent tank is surrounded by the lower frame, the case of the rear outrigger, the rear axle, and the selective catalytic reduction device, it is possible to prevent outside air from being directly blown onto the reducing agent tank during traveling or when the vehicle is stopped. Thereby, freezing of the reducing agent is prevented in a cold region, and thawing is easy even if it is frozen.

  According to the present invention, the selective catalyst reduction device in which the reducing agent tank is laid out at the optimum position without sacrificing the small turnability and rough terrain traveling performance of the rough terrain crane and good visibility or visibility in crane operation. Can be installed.

FIG. 1 is a perspective view of a rough terrain crane according to an embodiment of the present invention. FIG. 2 is a perspective view of an exhaust emission control device according to an embodiment of the present invention. FIG. 3 is an enlarged rear view of a main part of the lower traveling body according to the embodiment of the present invention. FIG. 4 is an enlarged side view of a main part of a rough terrain crane according to an embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate. In addition, this Embodiment is only one aspect | mode of the rough terrain crane which concerns on this invention, and it cannot be overemphasized that an embodiment may be changed in the range which does not change the summary of this invention.

[Overall structure and features]

  FIG. 1 is a perspective view of a rough terrain crane 10 according to an embodiment of the present invention.

  The rough terrain crane 10 includes a lower traveling body 11 and an upper working body 12.

  The lower traveling body 11 has a lower frame 13, and a front axle 14 and a rear axle 15 are provided on the lower frame 13. A diesel engine 20 serving as a drive source for the front axle 14 and the rear axle 15 is mounted on the rear end of the lower frame 13. The wheels 16 and 17 of the front axle 14 and the rear axle 15 are driven via a transmission (not shown) and are steered by a hydraulic cylinder (not shown). Further, a front outrigger 18 and a rear outrigger 19 are respectively provided at a lower front end and a lower rear end of the lower frame 13, and the lower traveling body 11 is stably grounded when the upper work body 12 is in operation. For simplification of the drawings, a part of the front outrigger 18 and the rear outrigger 19 is omitted, and only the case 29 is shown in these drawings. Further, a hydraulic pump (not shown) that supplies hydraulic pressure to the hydraulic motor and the upper working body 12 is provided in the lower frame 13. The diesel engine 20 includes an engine body (not shown) and an engine cover that covers the engine body. In the present embodiment, the diesel engine 20 is also referred to as the diesel engine 20 including the engine cover.

  The upper working body 12 includes a lower frame 13, and a swivel base 22 is rotatably mounted on the lower frame 13 via a swivel bearing 21. A boom device 23 is connected to the swivel base 22 via a undulation center pin, and the boom device 23 is supported by the undulation center pin so as to be raised and lowered. The telescopic boom 24 incorporates a telescopic cylinder (not shown), and expands and contracts when it is operated. The boom device 23 includes a winch 27 that is driven by a hydraulic motor. When the winch 27 is operated, the workpiece is moved up and down. A counterweight 28 is provided at the rear part of the swivel base 22 for stable work of the upper working body 12. In addition, a single control unit 26 for operating the lower traveling body 11 and operating the upper working body 12 is provided via a turning bearing 21.

  A feature of the rough terrain 10 according to the present embodiment is that an exhaust purification device 30 which will be described in detail later is mounted adjacent to the diesel engine 20, and a urea water tank 50 included in the exhaust purification device 30 (patent) The “reducing agent tank” described in the claims) is laid out as described later. Thus, the exhaust purification device 30 is mounted on the rough terrain crane 10 without sacrificing the small turnability and rough terrain traveling performance of the rough terrain crane 10 and good visibility or visibility in crane operation.

[Exhaust gas purification device]

  The exhaust purification device 30 is a device that receives supply of exhaust gas discharged from the diesel engine 20 and purifies it. The exhaust purification device 30 is disposed on the left side as viewed from the rear of the vehicle. In the present embodiment, the exhaust purification device 30 is provided with a cover 34. The cover 34 prevents the exhaust purification device 30 from being exposed to rain or dust.

  FIG. 2 is a perspective view of the exhaust purification device 30. FIG. 3 is an enlarged rear view of the main part of the lower traveling body 11. 2 and 3 show a state in which the cover 34 is removed. Further, these drawings show the layout of the exhaust purification device 30, and illustration of a bracket and the like for fixing the exhaust purification device 30 is omitted.

  The exhaust purification device 30 includes an oxidation catalyst device (hereinafter referred to as “DOC”) 31, a urea water tank 50 storing a predetermined reducing agent (urea water in the present embodiment), and urea water. A selective catalytic reduction device (hereinafter referred to as “SCR”) 32 for reducing nitrogen oxide in the exhaust, and a reducing agent supply device (hereinafter referred to as “DRT”) for supplying the urea water to the SCR 32. 33).

  A support member 35 is provided on the case 29 of the rear outrigger 19. The support member 35 includes ribs that reinforce the case 29 and is fixed to the case 29 and the lower frame 13. The support member 35 has a bent shape at the center, and is disposed so as to span between the case 29 and the side surface of the lower frame 13. Therefore, the upper surface 36 of the support member 35 is inclined obliquely downward from the side surface of the lower frame 13 toward the outside.

  The exhaust from the diesel engine 20 is first supplied to the DOC 31 and sequentially passes through the DRT 33 and the SCR 32 and is discharged from the muffler 37 to the atmosphere as exhaust gas. In the present embodiment, the muffler 37 is for reducing the sound when the exhaust gas is discharged (so-called silencer), and does not indicate the SCR 32 or a part thereof.

  The DOC 31 is connected to the exhaust pipe 38 of the diesel engine 20. The structure of the DOC 31 is known, and the DOC 31 is used to treat unburned fuel (HC, etc.) and carbon monoxide (CO) contained in the exhaust, and to convert nitrogen monoxide (NO) in the exhaust into nitrogen dioxide (NO 2). The main purpose is to oxidize. The DOC 31 has a function of oxidizing CO to carbon dioxide (CO2) and burning HC as the exhaust gas temperature rises. In the present embodiment, the DOC 31 includes a casing, and the outer shape of the casing is a columnar shape. The central axis of the DOC 31 is along the longitudinal direction 39 of the lower frame 13, that is, the longitudinal direction of the vehicle. The rear end 40 of the DOC 31 is disposed in front of the rear end 41 of the diesel engine 20. That is, the DOC 31 does not protrude rearward from the rear end 41 of the diesel engine 20. The exhaust discharged from the exhaust pipe 38 flows through the DOC 31 forward in the longitudinal direction.

  The SCR 32 is a device that supplies a reducing agent into exhaust to reduce nitrogen oxides (NOX), and finally converts the exhaust into a mixture of nitrogen (N2) and water (H2O) and releases it to the atmosphere. is there. In this embodiment, the DRT 33 supplies urea water to reduce NOX in the exhaust. When the DRT 33 injects urea water into the exhaust gas, it is hydrolyzed to produce ammonia (NH3), and NOX is reduced by this NH3. In addition, the structure of SCR32 and the structure of DRT33 are also known.

  In the present embodiment, the DRT 33 includes a cylindrical pipe 42 and a supply valve 43 that is continuous therewith, and introduces urea water from the urea water tank 50. The supply valve 43 is connected to the urea water tank 50 through a required pipe, and injects urea water into the cylindrical pipe 42 at a predetermined pressure. The DRT 33 is arranged in series with the DOC 31. That is, the center axis of the DRT 33 coincides with the center axis of the DOC 31, and the DRT 33 is disposed on the front side in the longitudinal direction 39 of the DOC 31 and extends forward. The exhaust gas that has passed through the DOC 31 flows along the longitudinal direction 39 and flows into the cylindrical pipe 42 of the DRT 33 and receives the supply of urea water from the supply valve 43.

  The SCR 32 includes a casing, and the outer shape thereof is formed in a cylindrical shape. The central axis of the SCR 32 is along the longitudinal direction 39. In the present embodiment, the SCR 32 is arranged in parallel with the DOC 31 and is connected to a connection pipe 44 formed in a substantially U shape. The exhaust gas that has passed through the DRT 32 enters the connecting pipe 44, makes a U-turn, and flows into the SCR 32. In the SCR 32, the exhaust gas is purified as described above and discharged as N2 and H2O.

  As shown in FIG. 3, the SCR 32 is arranged above the DOC 31 and is arranged along the short direction 45 of the lower frame 13. That is, the center axis of the SCR 32 and the center axis of the DOC 31 are parallel, and the SCR 32 and the DOC 31 face each other in the short direction 45. Moreover, the SCR 32 and the DOC 31 are disposed above the support member 35. In particular, in the present embodiment, the SCR 32 is disposed at a position that is biased toward the diesel engine 20 relative to the DOC 31, and both are disposed along the upper surface 36 of the support member 35.

[Urea water tank]

  FIG. 4 is an enlarged side view of a main part of the rough terrain crane 10 and shows a layout of the urea water tank 50. (A) is a front view, (b) is a side view.

  The urea water tank 50 is generally made of a material such as a resin or stainless steel that has high corrosion resistance against urea water and is excellent in weather resistance and impact resistance. The shape of the urea water tank 50 is not particularly limited, but is formed in a rectangular parallelepiped shape in the present embodiment.

  As shown in the figure, the urea water tank 50 is disposed behind the rear axle 15 and ahead of the rear outrigger 19. More specifically, the urea water tank 50 is disposed behind the rear wheel mud guard 52. The urea water tank 50 is supported by the case 29 of the rear outrigger 19 via a bracket 51. That is, the side surface of the urea water tank 50 is disposed along the case 29, and the back surface of the urea water tank 50 is disposed along the lower frame 13. In the present embodiment, a predetermined gap is formed between the lower frame 13 and the urea water tank 50, but the urea water tank 50 may be close to the lower frame 13.

  Moreover, in this embodiment, the urea water tank 50 is arrange | positioned under the said DRT33. That is, the urea water tank 50 is disposed in the vicinity of the DRT 33 and the SCR 32. Moreover, in the present embodiment, the urea water tank 50 is disposed below the SCR 32, and the SCR 32 forms a ridge.

[Effects of exhaust purification system]

  Since the rough terrain crane 10 is equipped with the exhaust purification device 30, the exhaust of the rough terrain crane 10 is purified, and it is possible to clear the recent severe exhaust gas regulations. Since the urea water tank 50 included in the exhaust gas purification device 30 is disposed at the position shown in FIG. 4, the urea water tank 50 is disposed at a position where the urea water tank 50 is recessed at the side of the vehicle body, that is, a position facing the outside of the vehicle body side surface. Will be. Thereby, the operation of injecting urea water into the urea water tank 50 is easy. Moreover, the influence of the radiant heat from the exhaust system of the diesel engine 20 is suppressed, and the deterioration of the urea water in the tank is suppressed. In addition, since the urea water tank 50 is arranged in a compact manner as described above, the overall length and width of the lower traveling body 11 do not increase, and the merit of the rough terrain crane 10 is not sacrificed.

  In particular, since the urea water tank 50 is disposed between the rear wheel mud guard 52 and the case 29 of the rear outrigger 19, a stepping stone from the wheel 17 (corresponding to “rear wheel tire” recited in the claims). Therefore, there is an advantage that the urea water tank 50 is protected.

  Furthermore, since the urea water tank 50 is disposed in the vicinity of the SCR 32 and the DRT 33 as described above, piping for supplying urea water is simplified. In addition, the SCR 32 forms a ridge with respect to the urea water tank 50, and the urea water tank 50 is shielded from direct sunlight. Thereby, the quality deterioration of urea water is suppressed. In addition, even when the urea water tank 50 is made of a resin, the ultraviolet deterioration of the urea water tank 50 is suppressed. Moreover, since the urea water tank 50 is disposed at a position surrounded by the lower frame 13, the case 29 of the rear outrigger 19, the wheels 17, and the SCR 32, outside air is directly blown when the vehicle is traveling or stopped. It is never done. As a result, freezing of urea water is prevented in winter. Moreover, even if urea water freezes, it is easy to thaw.

  In the present embodiment, the urea water tank 50 is disposed at the position shown in FIG. 4, but is not limited to this position. For example, if urea water supply piping is allowed to be somewhat complicated, the urea water tank 50 may be disposed on the right side of the vehicle, that is, on the side where the muffler of the diesel engine 20 is not provided. Further, the urea water tank 50 may be disposed in a space between the front axle 14 and the rear axle 15. In short, the urea water tank 50 may be disposed in another part as long as the operation of injecting the urea water is easy and the influence of the radiant heat from the exhaust system is suppressed.

[Additional effects]

  In the present embodiment, as shown in FIG. 2, the DOC 31 and the DRT 33 are arranged in series, and the DOC 31 and the SCR 32 are arranged in parallel, and the exhaust purification device 30 is laid out in a compact manner on the lower frame 13. For this reason, the exhaust purification device 30 does not protrude rearward from the rear end 41 of the diesel engine 20 as described above, and an increase in the size of the rough terrain 10 in the longitudinal direction 39 (full vehicle length direction) is prevented. In addition, since all of the DOC 31, SCR 32, and DRT 33 are not arranged in parallel, but only the DOC 31 and SCR 32 are arranged in parallel, the exhaust purification device 30 is located outside the outer edge of the rear outrigger 19 as shown in FIG. It does not protrude and an increase in the size of the rough terrain crane 10 in the short direction (vehicle width direction) is also prevented.

  Further, since the DOC 31 and the SCR 32 are arranged above and below and these are arranged above the rear outrigger 19 and adjacent to the diesel engine 20, the exhaust purification device 30 is provided at the left end or right end of the rear end portion of the vehicle. It is arranged very compactly by effectively using the space. Therefore, for example, even if the boom device 23 is turned during crane work, the region (so-called blind spot) where the exhaust purification device 30 blocks the field of view for the operator is not enlarged. In addition, since the DOC 31 is disposed at a position close to the exhaust pipe 38, there is an advantage that the exhaust pipe between the diesel engine 20 and the exhaust purification device 30 is also simplified.

  In the present embodiment, the DOC 31 and the DRT 33 are arranged in series, but the DRT 33 and the SCR 32 may be arranged in series. However, even in this case, the DOC 31 and the SCR 32 are arranged in parallel.

  In this embodiment, as FIG. 3 shows, SCR32 is arrange | positioned in the position of the diesel engine 20 side rather than DOC31. That is, the SCR 32 is further shifted toward the vehicle center side and is disposed at a position close to the diesel engine 20. Therefore, a layout that effectively uses the space above the rear outrigger 19 is realized, and there is also an advantage that the route (pipe) for the exhaust gas purification process can be further simplified.

  In the present embodiment, the support member 35 includes a reinforcing rib that connects the lower frame 13 and the case 29 of the rear outrigger 19. The upper surface 36 of the support member 35 is inclined from the lower frame 13 toward the case 29, and the DOC 31 and the SCR 32 are arranged along the upper surface 36. That is, the DOC 31 and the SCR 32 are arranged more efficiently in the side space of the diesel engine 20, and a compact layout is realized. In the above embodiment, the rough terrain crane 10 includes the so-called H-type rear outrigger 19, but it goes without saying that a so-called X-type outrigger may be provided instead.

DESCRIPTION OF SYMBOLS 10 ... Rough terrain crane 11 ... Lower traveling body 12 ... Upper work body 13 ... Lower frame 14 ... Front axle 15 ... Rear axle 19 ... Rear outrigger 20 ... Diesel engine 30 ... Exhaust gas purification device 31 ... DOC
32 ... SCR
33 ... DRT
50 ... Urea water tank 51 ... Bracket 52 ... Rear wheel mudguard

Claims (4)

A lower traveling body having a front axle and a rear axle; a boom device disposed at an upper portion of the lower traveling body; and a single control unit that performs traveling and a boom operation via a hydraulic actuator. Is disposed on the lower frame, on the front outrigger and the rear outrigger disposed on the lower side of the front end and on the lower side of the rear end, and on the upper side of the rear end of the lower frame, and drives the axles and the hydraulic pressure. A rough terrain crane having an engine for supplying hydraulic pressure to an actuator;
An exhaust gas purification apparatus having a reducing agent tank in which a reducing agent is stored, a reducing agent supply device, and a selective catalytic reduction device disposed downstream of the reducing agent supply device is mounted.
The reducing agent tank
A rough terrain crane disposed rearwardly of the rear axle and forward of the rear outrigger and at a position along the lower frame and the case of the rear outrigger.   The rough terrain crane according to claim 1, wherein the reducing agent tank is disposed between a mud guard provided in the vicinity of the rear axle and a case of the rear outrigger.   The rough terrain crane according to claim 1 or 2, wherein the reducing agent tank is disposed below the reducing agent supply device. The rough terrain crane according to any one of claims 1 to 3, wherein the reducing agent tank is disposed below the selective catalytic reduction device.

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